An abnormal battery processing system and method. The abnormal battery processing system comprises a box body, a fire protection device, and a cooling device. The water protection device is disposed in the box body and used for accommodating a battery. The cooling device is disposed in the box body, and a liquid is contained in the cooling device. When the temperature of the fire protection device is equal to or higher than a preset temperature, the cooling device releases the liquid, so that the liquid flows from the cooling device into the box body and the fire protection device is immersed in the liquid. Therefore, according to the present invention, the structural and component integrity of the battery can be maintained when the temperature of the battery is lower than the preset temperature, thus facilitating the subsequent analysis and recycling of the battery. In addition, according to the present invention, rapid cooling of the battery can be ensured when the temperature of the battery is equal to or higher than the preset temperature, thereby preventing the battery from burning or exploding.
H01M 10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
H01M 10/48 - Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
A62C 3/16 - Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
Method and associated system for managing and/or authenticating an energy storage device.The method includes receiving a first portion of identification information stored in a data storage attached to the energy storage device (401);analyzing the first portion of the identification information at least partially based on a device identification of the device (403);updating a second portion of the identification information stored in the data storage attached to the energy storage device based on a result of analyzing the first portion of the identification information (405).
The present disclosure is directed to methods, devices, and systems for playing audio signals associated with an electric vehicle. The method includes, for example, (1) determining a speed of the electric vehicle; (2) receiving, from a memory, a plurality of sound frequency characteristics corresponding to the determined speed of the electric vehicle; and (3) generating an audio signal segment corresponding to the received sound frequency characteristics by a speaker of the electric vehicle. The sound frequency characteristics include a plurality of segments. Each of the segments includes an amplitude of a number of frequency characteristics in a sound produced by a powertrain assembly (e.g., an electric motor) in a speed range.
The present disclosure relates to methods and associated systems for unlocking a vehicle. The vehicle has a first input device and a second input device. The method includes (1) receiving a passcode from the first input device; (2) receiving a confirmation of the passcode from the second input device; and (3) in response to the confirmation, storing the passcode in a storage device associated with the vehicle. The passcode is input by operating the first input device in a first predetermined way, and, the confirmation is input by operating the second input device in a second predetermined way.
A battery charging apparatus includes a battery compartment having a receptacle that is configured to receive a battery pack. The battery charging apparatus includes a first heat exchange module and/or a second heat exchange module. The first heat exchange module includes a plenum surrounding the receptacle, where the plenum includes a chamber to receive a fluid. The plenum also includes a plurality of flow guides disposed in the chamber to define a variable flow passage for the fluid. The second heat exchange module includes a battery connector and a heat sink thermally coupled to the battery connector. The heat sink is arranged to dissipate thermal energy from the battery pack.
A portable electrical energy storage device is provided with a frame (100) that includes a plurality of receptacles (102) for receiving a portion of a portable electrical energy storage cell (200). A cap (910) is provided over the plurality of receptacles (102) and the portion of the portable electrical energy storage cells received in the frame (100). In some embodiments, a passageway (112) extends between adjacent receptacles (102). Disposed within the passageway (112) is a plug which exhibits more resistance to thermal energy migration than other portions of the frame that define the adjacent receptacles.
H01M 2/10 - Mountings; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
H01M 2/12 - Vent plugs or other mechanical arrangements for facilitating escape of gases
H01M 10/653 - Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
7.
APPARATUS, METHOD AND ARTICLE FOR ELECTRIC VEHICLE SHARING
A network of collection and distribution machines may collect, charge and/or distribute portable electrical energy storage devices (e.g., batteries, supercapacitors or ultracapacitors). Electric vehicles available for sharing, renting or otherwise available for temporary use may be located at such collection and distribution machines or other designated areas. Users may request temporary use of such electric vehicles via a user interface of the collection and distribution machine, the user's mobile device or that of the electric vehicle itself. During temporary use, the user may exchange depleted portable electrical energy storage devices of the vehicle being used for charged portable electrical energy storage devices at the collection and distribution machines and may be offered the opportunity to terminate the temporary use session or continue the temporary use session in conjunction with the portable electrical energy storage device exchange.
A network of collection and distribution machines may collect, charge and/or distribute portable electrical energy storage devices (e.g., batteries, supercapacitors or ultracapacitors). Electric vehicles available for sharing, renting or otherwise available for temporary use may be located at such collection and distribution machines or other designated areas. Users may request temporary use of such electric vehicles via a user interface of the collection and distribution machine, the user's mobile device or that of the electric vehicle itself. During temporary use, the user may exchange depleted portable electrical energy storage devices of the vehicle being used for charged portable electrical energy storage devices at the collection and distribution machines and may be offered the opportunity to terminate the temporary use session or continue the temporary use session in conjunction with the portable electrical energy storage device exchange.
A torque-speed curve or data of load that is used as a standard to determine an external condition in which an electric vehicle is operating such as incline or no incline, head wind or no headwind, high temperature or low temperature. The system compares samples of actual torque-speed of load data to the standard. Based on the comparison, the system determines the external condition (going up a hill, traveling into a headwind, operating at high temperature) or an abnormal operation of the vehicle powertrain, for example, low tire pressure, elevated friction, wheels out of alignment. Based on the determination, the system takes an action to govern a maximum torque output of the motor to control temperature of the vehicle battery; to raise a wind deflector; to govern maximum speed of the vehicle to reduce danger resulting from low tire pressure, elevated powertrain friction or out of alignment wheels; or to initiate an indication of abnormal conditions.
B60L 15/20 - Methods, circuits or devices for controlling the propulsion of electrically-propelled vehicles, e.g. their traction-motor speed, to achieve a desired performance; Adaptation of control equipment on electrically-propelled vehicles for remote actuation from a stationary place, from alternative parts of the vehicle or from alternative vehicles of the same vehicle train for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
B60L 11/18 - using power supplied from primary cells, secondary cells, or fuel cells
B62K 11/00 - Motorcycles, engine-assisted cycles or motor scooters with one or two wheels
10.
ELECTRICAL CONNECTOR FOR PORTABLE MULTI-CELL ELECTRICAL ENERGY STORAGE DEVICE
Electrical connectors for electrically connecting individual portable electrical energy storage cells making up a plurality of portable electrical energy storage cells that are part of a portable electrical energy storage device for powering portable devices such as vehicles or consumer electronics include bands of reduced cross-sectional area. The electrical connectors include conductive bands that promote reliable attachment between the electrical connector and portable electrical energy storage cells and provide the ability to electrically isolate failing or damaged cells.
An electrical energy storage device for powering portable devices such as vehicles or consumer electronics includes barriers to minimize migration of thermal energy and propagation of combustion in the rare event that electrical energy storage cells fail, burst and ignite. Thermal energy absorbing materials are contained within the electrical energy storage device. Sacrificial members are provided within the thermal energy absorbing materials. In-situ channels are formed within the thermal energy absorbing materials when the sacrificial members thermally decompose.
H01M 10/659 - Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
H01M 10/653 - Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
H01M 2/10 - Mountings; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
A vehicle is provided. The vehicle includes a frame, a cover, and a connection unit. The cover includes an external surface and an internal surface opposite to the external surface, wherein the internal surface faces toward the frame when the cover is attached to the frame. The connection unit is configured to connect the cover and the frame magnetically.
Electrically powered vehicles may be equipped with both mechanical braking systems and regenerative braking systems. Regenerative braking systems improve vehicle efficiency by returning a portion of the energy lost in deceleration to the battery of the electrically powered vehicle. An electrically powered vehicle controller that provides collision avoidance functionality can maximize the energy returned to the battery of the electrically powered vehicle by maximizing the use of regenerative braking for collision avoidance. A first braking mode can include only regenerative braking for objects greater than the minimum regenerative stopping distance. A second braking mode can include composite braking using both mechanical and regenerative braking. The electrically powered vehicle controller determines the maximum regenerative braking level at least based on data provided battery charge level or battery state sensors.
B60W 30/08 - Predicting or avoiding probable or impending collision
B60W 10/18 - Conjoint control of vehicle sub-units of different type or different function including control of braking systems
B60W 10/26 - Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
An illumination device for a vehicle includes a light source configured to be installed at the vehicle, and a switch electrically coupled with the light source, wherein the switch and the light source are operable by magnetism.
B60Q 3/06 - Arrangement of lighting devices for vehicle interior, the mounting or supporting thereof or circuits therefor for lighting compartments other than passenger or driving space, e.g. luggage or engine compartment
A supporting apparatus for supporting a vehicle includes a frame member including a first portion, a second portion disposed opposite to the first portion, a first elongated portion extended between the first portion and the second portion, and a second elongated portion disposed opposite to the first elongated portion and extended between the first portion and the second portion, and a bar protruded from the first portion and disposed proximal to the second elongated portion.
An asset includes a short range transmitter that broadcasts a first signal that includes a unique identifier associated with the asset. Each asset is carried by one of number of mobile devices, and each asset is freely exchangeable between any of the number of mobile devices. Each of at least some of the mobile devices carries a receiver to receive the first signals within reception range of the receiver. Each of at least some of the mobile devices aggregates the received unique identifiers. Each of at least some of the mobile devices carries a transmitter that transmits a second signal that includes data representative of a geolocation of the respective mobile device and data indicative of the unique identifiers received by the respective mobile device to a back-end system. The back-end system uses the data included in the received second signals to track and locate assets within a geographic area.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
H04W 4/02 - Services making use of location information
H04W 4/06 - Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
H04W 84/18 - Self-organising networks, e.g. ad hoc networks or sensor networks
A storage container installable within a vehicle includes a frame including an inside rim portion, and a receptacle attachable to the inside rim portion, wherein the receptacle is more flexible than the frame.
B60R 7/02 - Stowing or holding appliances inside of vehicle primarily intended for personal property smaller than suit-cases, e.g. travelling articles, or maps in a separate luggage compartment
A fluid container for a vehicle includes a case configured to hold fluid, a baffle disposed at a bottom of the case and configured to partition the fluid, and a plate including an aperture and disposed above the baffle, wherein a portion of the baffle is aligned with the aperture.
A biasing system for a vehicle includes a first bracket defined with a first cavity, a second bracket defined with a second cavity and hinged with the first bracket, and a biasing member configured for pivoting the first bracket relative to the second bracket, wherein the biasing member is disposed within the first cavity and the second cavity.
A housing structure for forming a body of a vehicle is provided. The housing structure comprises a lower portion (300) and an upper portion (200). The lower portion has a plate-like central part (310), a front end (314), a rear end (316), and a first bonding part (312) formed on each of the lateral sides of the plate-like central part. The upper portion comprises a central part (210) and a front part (220). The central part has a first end (212), a second end (214), and a second bonding par (240) formed on each of the lateral sides of the central part. By fixing the first bonding part and the second bonding part together, the lower and upper portions are adapted to form the body of the vehicle. The housing structure can effectively reduce the weight of the body while still maintaining the strength of the body.
Provided is a side stand for supporting a two-wheeled vehicle on a ground. The side stand (100) comprises a first link (110), a second link (120) and a stand (130). The first link (110) has two ends (111,112) respectively pivoted to a base part (200) of the two-wheeled vehicle and the stand (130). The second link (120) also has two ends (121,122) respectively pivoted to the base part (200) of the two-wheeled vehicle and the stand (130). The stand (130) has a lower end (132), and a pivot end (131) where the first and second links are pivoted to. The lower end (132) of the stand (130) abuts against the ground when the stand (130) is in an open state.
A multi-link suspension includes a frame member, a first member pivotably coupled at a first end to the frame member, and a second member pivotably coupled at a first end to a second end of the first member. A dampener physically couples between the first member and the second member. The dampener limits the rotation of the second member about the second end of the first member to a defined arc. The first member includes a horizontal upper surface to which an electric traction motor providing a shaft output attaches. A power transmission system, such as a flexible belt, couples the shaft output provided by the electric traction motor to a drive hub rotatably attached to a second end of the second member.
B60G 11/04 - Resilient suspensions characterised by arrangement, location, or kind of springs having leaf springs only arranged substantially parallel to the longitudinal axis of the vehicle
F16H 7/24 - Equipment for mounting belts, ropes, or chains
B62K 11/00 - Motorcycles, engine-assisted cycles or motor scooters with one or two wheels
23.
APPARATUS, SYSTEM, AND METHOD FOR VENDING, CHARGING, AND TWO-WAY DISTRIBUTION OF ELECTRICAL ENERGY STORAGE DEVICES
A two-way distribution, charging, and vending system permits a subscriber to exchange one or more partially or completely discharged portable electric energy storage devices for a comparable number of charged portable electric energy storage devices. The two-way distribution, charging, and vending system includes a number of charging modules, each with a dedicated power converter, communicably coupled to at least one two-way distribution system controller and to a power distribution grid. Upon receipt of a discharged portable electric energy storage device, the at least one two-way distribution system controller validates a manufacturer identifier and a subscriber identifier stored in a nontransitory storage media carried by the discharged portable electric energy storage device. Responsive to a successful authentication and validation, the at least one two-way distribution system controller dispenses a charged portable electric energy storage device to the subscriber.
Multidirectional electrical connectors, electrical connector plugs and electrical connection systems for electrically connecting a portable energy storage device to an electrically powered device, such as an electric powered vehicle or a device for electrically charging the portable electrical energy storage device are described. The multidirectional feature of the electrical connectors, electrical connector plugs and electrical connections systems permit electrical connection between the electrical connectors and electrical connector plugs in a plurality of rotational orientations between a portable electrical energy storage device to which a connector or plug is electrically connected and an electrically powered device to which a corresponding plug or connecter is electrically connected.
H01R 24/38 - Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
H01R 13/15 - Pins, blades or sockets having separate spring member for producing or increasing contact pressure
A motor cooling system for cooling a motor unit including a stator assembly and a rotor assembly configured to rotate a rotor shaft, which includes a stator casing and an arm casing. The stator casing includes a stator casing body having a stator casing wall with an internal cavity to receive the motor unit and a rib with a groove defined between adjacent portions of the rib. The arm casing includes an arm casing body having an internal cavity to receive the stator casing and a port in fluid communication with the groove.
An actuatable foot rest system includes a foot rest member pivotably displaceable between a first position to a second position. The actuatable foot rest system may also include a biasing member that biases the foot rest member about the at least one pivotable connection, at least from the first position to the second position. The actuatable foot rest system may further include a remotely actuated retention mechanism that includes an actuator disposed remote from the foot rest member and which maintains the foot rest member in the first position and, when remotely actuated using the actuator, releases the foot rest member from the first position.
A system for utilizing an array of electrical energy storage devices utilizes a smart manager that categorizes electrical energy storage devices in the array based on electrical energy storage device age and/or internal resistance level and causes those electrical energy storage devices with similar ages and/or resistance levels to be concurrently depleted. This is followed by concurrently depleting the electrical energy storage devices in a different category. The system also disconnects faulty electrical energy storage devices in the array and helps alleviate the need to carefully consider and reconfigure the location of individual electrical energy storage devices in the array. The system facilitates forecasting actual capacity and thus helps to guarantee available capacity and to actively maintain capacity via maintenance crews that need simply remove and replace cells as advised by the smart manager. The system 100 facilitates permitting a quality of service (QoS) to be provided to mission critical entities (banks, hospitals, etc.).
A collapsible step bar (100) comprising a step bar body (110), a bracket (120), a first link (130), a second link (140) and a pin (150) is provided. The step bar body (110) comprises a first axis (112) and a second axis (114) in a front end. The bracket (120) is disposed adjacent the step bar body (110). The first link (130) comprises a first end (132) and a second end (134), and the second link (140) comprises a first end (142) and a second end (144) respectively. Both the first ends (132) of the first link (130) and the second link (140) are pivotably disposed on the bracket (120), and both the second ends (134) of the first link (130) and the second link (140) are pivotably disposed on the first axis (112) and the second axis (114) of the step bar body (110) respectively. The pin (150) is disposed on a hinge joint between the bracket (120) and the first link (130) for control of a rotation of the first link (130), which makes the step bar body (110) in a closed state or an open state.
Detected events such as impacts, accidents, breakdowns, and types of driving behaviors based on feedback from tilt, gravity, accelerometers and/or shock sensors within a portable electrical power storage device such as a battery and/or within a vehicle (e.g., an electric scooter) are communicated to the user's mobile device, dashboard display and/or backend systems over wired and/or wireless communication channels. The communication of the events and types of events are logged and automatically aggregated from multiple vehicles for further analysis to determine various potential system-wide safety issues and to track event history on an individual per-user or individual per-scooter basis or individual per-battery basis. Such event data may also be transferred accordingly via the battery exchange process at the online exchange machine through a memory device attached to the battery that stores the event data.
B60R 16/02 - Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric
30.
APPARATUS, METHOD AND ARTICLE FOR POWER STORAGE DEVICE FAILURE SAFETY
In response to receiving information regarding an unsafe condition from portable electrical energy storage device (e.g., battery) safety sensors, a locking mechanism controller determines whether the battery is in a desired state to, as a safety measure, have the compartment that holds the battery locked and/or to send a signal to reduce or eliminate current draw from the battery. If the locking mechanism controller determines the battery is in the desired state to have the compartment locked, then it sends a signal to a compartment locking mechanism causing the compartment locking mechanism to lock the compartment in which the battery is located to prevent a user from opening the compartment, and thus helps protect the user against the unsafe condition. In some embodiments, the unsafe condition may be a potential or existing catastrophic failure of the battery in the compartment (e.g., a meltdown, explosion or dangerous leak, etc.).
B60L 11/18 - using power supplied from primary cells, secondary cells, or fuel cells
B60W 10/26 - Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
31.
PORTABLE ELECTRICAL ENERGY STORAGE DEVICE WITH THERMAL RUNAWAY MITIGATION
Electrical energy storage device for powering portable devices such as vehicles or consumer electronics includes barriers to minimize migration of thermal energy and propagation of combustion in the rare event that electrical energy storage cells fail, burst and ignite. A burst structure is provided to vent gas from the device in a desired direction in the event pressure within the device exceeds a maximum value. Biased vents permit gases emanating from a portable electrical energy storage cell within an electrical energy storage module to escape and isolate other electrical energy storage cells from the gases.
Electric vehicles such as scooters are reliant upon one or more electrical energy storage devices to not only provide motive power but also power some or all vehicular systems. An electrical energy storage device can be equipped with a number of thermal sensors that provide data indicative of overall and/or localized electrical energy storage device temperature(s) to a controller. In order to maintain the electrical energy storage device in a desired thermal operating range or profile, the controller can selectively alter or control the power distributed or allocated to one or more vehicular systems. Such alteration or control of power allocation may be performed by the controller based upon an assessed degree of vehicular system criticality.
Electric vehicles such as scooters can have a first operating mode in which energy is supplied by a single electrical energy storage device and a second operating mode in which energy is supplied by multiple electrical energy storage devices. A circuit element can be included in the circuit connecting the electrical energy storage devices to a prime mover such as a traction motor. The circuit element has a first, electrically conductive, state that couples only the single electrical energy storage device to a traction motor and a second, electrically non-conductive, state that couples the multiple electrical energy storage devices to the prime mover. The transition of the circuit element from the first state to the second state can occur by irreversibly fracturing the circuit element upon installation of multiple electrical energy storage devices or by a controller transitioning the circuit element from the first state to the second state.
A network of collection, charging and/or distribution machines collect, charge and/or distribute portable electrical energy storage devices (e.g., batteries, supercapacitors or ultracapacitors). In some embodiments, if the user selects to change their current portable electrical power storage device exchange plan to a two-portable electrical power storage device exchange plan while exchanging their current portable electrical power storage device, the user will return their current portable electrical power storage device and will receive two portable electrical power storage devices in exchange at the collection, charging and distribution machine. The user may also be required to pay additional fees and/or commit to additional obligations while at the collection, charging and distribution machine in order to change to the different portable electrical power storage device exchange plan.
A network of collection, charging and distribution machines collect, charge and distribute portable electrical energy storage devices (e.g., batteries, supercapacitors or ultracapacitors). Relevant information regarding vehicles that use the collection and distribution machines is communicated to or acquired by mobile devices of users associated with one or more of the vehicles. The vehicle information may include information regarding diagnostics or status of the vehicle and information regarding usage history of the vehicle received from different sources. This information is then processed and analyzed at the mobile device and such information is presented by the mobile device in a useful manner to the user and/or communicated to another device external to the mobile device, such as the vehicle, for further processing or communication of the data.
A collection, charging and distribution machine collects, charges and distributes portable electrical energy storage devices (e.g., batteries, super- or ultracapacitors). To charge, the machine employs electrical current from an external source, such as the electrical grid or an electrical service of an installation location. The machine determines a first number of devices to be rapidly charged, employing charge from a second number of devices identified to sacrifice charge. Thus, some devices may be concurrently charged via current from the electrical service and current from other devices, to achieve rapid charging of some subset of devices. The devices that sacrifice charge may later be charged. Such may ensure availability of devices for end users. Collection, charging and distribution machines may be deployed individually or as networked collection, charging and distribution modules with one collection, charging and distribution module controlling at least one other collection, charging and distribution module.
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
B60L 11/18 - using power supplied from primary cells, secondary cells, or fuel cells
B60W 10/26 - Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
37.
SUSPENSION STRUCTURE AND DRIVING ASSEMBLY COMPRISING THE SAME
A suspension structure utilized in a driving assembly of a vehicle with a first suspension arm, a second suspension arm, a third suspension arm and a shock absorber component is provided. The first suspension arm has a first fixed end and a first swing end opposite to the first fixed end. The second suspension arm has a second fixed end and a second swing end opposite to the second fixed end. The third suspension arm has a front swing end and a rear swing end opposite to the front swing end. The shock absorber component is disposed between the first suspension arm and the second suspension arm, and has two ends pivotally connected to the first suspension arm and the second suspension arm respectively. The shock absorber component is adapted to absorb an impact force by deforming while the impact force generated.
A network of collection, charging and distribution machines collect, charge and distribute portable electrical energy storage devices (e.g., batteries, supercapacitors or ultracapacitors). To charge, the machines employ electrical current from an external source, such as the electrical grid or an electrical service of an installation location. Users may also use portable charging devices that authenticate portable electrical energy storage devices or are authenticated by portable electrical energy storage devices before the charging is allowed or enabled. This authentication may be via wired or wireless communication channels between the portable charging device and portable electrical energy storage device, such as via near field communication (NFC) channels.
A vehicle turn signal system causes a turn signal to turn off when a turn is completed or nearly completed based on the orientation of the vehicle changing to turn to a certain degree in a direction indicated by the turn signal. Current heading, position, location and/or or other such information is electronically received from a compass or other device by a turn signal switch controller. When the vehicle has changed direction from the direction the vehicle was traveling at the time associated with when the turn signal was turned on, a signal is sent to turn off the turn signal and reset the manual turn signal button or lever.
B60Q 1/34 - Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction
B60Q 11/00 - Arrangement of monitoring devices for devices provided for in groups
A power delivery system for an electric vehicle provides efficient power management for either continuous or intermittent high-performance operation, using a boost stage and an on-board charging circuit. A main battery, configured as a high-capacity power source, supplies power to the electric motor under normal load conditions. An auxiliary boost battery assists the main battery in supplying a high-level current at a higher discharge rate thereby causing the motor to operate in a high-performance drive mode. A charging circuit recharges the boost battery from the main battery during operation of the motor. The charging circuit also maintains a charge balance between the boost battery and the main battery when the two batteries have different chemistries. In one embodiment, participation of the boost battery in powering the electric motor can be controlled automatically according to sensed changes in the load. In another embodiment, power management can be based on timed intervals.