According to one embodiment, a battery control device includes a charge and discharge circuit and a processor. The processor determines, based on an information regarding a secondary battery electrically connected to the charge and discharge circuit, whether or not a diagnosis implementation condition is satisfied; controls the charge and discharge circuit to charge the secondary battery only after discharging or charging up to a charging-start SOC if the diagnosis implementation condition is satisfied; acquires measurement data of a voltage and a current of the secondary battery while charging; estimates an internal state parameter of the secondary battery based on the measurement data; and diagnoses a deterioration state of the secondary battery based on the internal state parameter of the secondary battery.

An ECU performs processing including obtaining a current in a battery assembly, calculating a current in each battery, calculating an SOC of each battery, calculating an OCV of each battery, calculating ΔOCV, calculating an average value Ave of ΔOCVs, carrying out current restriction control when the average value Ave exceeds a first range and exceeds a second range, providing a warning signal when the average value Ave does not exceed the second range, and carrying out normal current control when the average value Ave does not exceed the first range.

An electrical combination. The combination comprises a hand held power tool, a battery pack and a controller. The battery pack includes a battery pack housing connectable to and supportable by the hand held power tool, a plurality of battery cells supported by the battery pack housing, each of the plurality of battery cells having a lithium-based chemistry, being individually tapped and having an individual state of charge. A communication path is provided by a battery pack sense terminal and a power tool sense terminal. The controller is operable to monitor a state of charge of a number of battery cells less than the plurality of battery cells and to generate a signal based on the monitored state of charge of the number of battery cells less than the plurality of battery cells, the signal being operable to control the operation of the hand held power tool.

A battery overcharge preventing device according to an embodiment of the present invention includes: a voltage distribution unit connected to both ends of at least one battery cell in a battery module including multiple battery cells, the voltage distribution unit being configured to distribute a voltage of the at least one battery cell according to a preset ratio; a voltage sensing unit operating so as to allow a control current to flow when the voltage distributed by the voltage distribution unit is greater than a preset reference voltage; and a second relay configured to block, by operation of the voltage sensing unit, operation of a first relay that establishes an electrical connection between the battery module and a charging module.

A battery pack includes a battery including at least one battery cell, a cell balancing device configured to balance a voltage of the at least one battery cell, a switch unit including a charging switch and a discharging switch arranged on a high current path through which a charging current and a discharging current flow, and a battery management unit configured to monitor a voltage and a current of the battery, to control the cell balancing device, and to control charging and discharging operations of the battery, wherein when a state of the battery during charging with a constant current satisfies a preset swelling condition, the battery management unit is configured to operate the cell balancing device for a preset discharging time to make the battery self-discharge, when the present discharging time passes, the battery management unit is configured to pause the battery from self-discharging for a preset pausing time, and when the preset pausing time passes, the battery management unit is configured to charge the battery.

A system and method for balancing a battery having a plurality of cells connected in series. The system includes a plurality of reactive charge transfer units connected with the plurality of cells, a first control unit and a second control unit. The first control unit is configured to determine a state of charge of the plurality of cells, determine a reference value associated with the battery, identify an overcharged cell or a discharged cell in the battery, and determine a charge differential between state of charge of the overcharged cell or the discharged cell and the reference value associated with the battery. The second control unit is configured to arrange charge transfer between the overcharged cell or the discharged cell, and remaining pack of cells in the battery. The first and the second control units are configured to function iteratively until cell balancing is attained.

The present disclosure discloses an electric tool power supply having a vehicle starting function. The electric tool power supply comprises a power supply component, a first output interface, and a second output interface. The power supply component is configured to store and provide electrical energy. The first output interface is electrically coupled to the power supply component. The power supply component is configured to provide operating voltage for an electric tool through the first output interface when the electric tool power supply is installed on the electric tool. The second output interface is electrically coupled to the power supply component. The power supply component is configured to output instantaneous large-current to a starter of a vehicle through the second output interface when the electric tool power supply is installed on the vehicle, so as to start the starter.

A charging control apparatus, a device to be charged, and a charging control method are provided. The charging control apparatus includes: a first charging channel configured to charge a plurality of cells coupled in series according to a charging signal provided by a first-type power supply device; a second charging channel configured to charge a part of the cells in the plurality of cells according to a charging signal provided by a second-type power supply device; and an equalizing circuit configured to equalize a voltage of the plurality of cells during an operating process of the second charging channel.

A battery polarity determination circuit includes a battery accommodating unit including a first contact and a second contact to be in contact with respective electrode terminals of a battery, a control device that is connected via a resistor to a voltage lead-out point at which a voltage of the battery is led out and determines a polarity of the battery, a connection switching circuit capable of switching between a first connection state and a second connection state, and a diode having a cathode to be connected to a voltage read-in point at which the resistor and the control device are connected to each other, and an anode to be grounded, wherein the control device determines the polarity of the battery based on a voltage at the voltage read-in point according to the connection state of the connection switching circuit, and a forward voltage of the diode is set so that the voltage at the voltage read-in point is not less than a lower limit value of an absolute maximum rating of the control device.

A battery system with a large-format Li-ion battery powers attached equipment by discharging battery cells distributed among a plurality of battery packs. The discharging of the battery cells is controlled in an efficient manner while preserving the expected life of the Li-ion battery cells. Each battery pack internally supports a battery management system and may have identical components, thus supporting an architecture that easily scales to higher power/energy. Battery packs may be added or removed without intervention with a user, where one of battery packs serves as a master battery pack and the remaining battery packs serve as slave battery packs. When the master battery pack is removed, one of the slave battery packs becomes the master battery pack. Charging and discharging of the battery cells is coordinated by the master battery pack with the slave battery packs over a communication channel such as a controller area network (CAN) bus.