A battery state determination system is a battery state determination system including an in-vehicle device and a server device, the in-vehicle device includes an acquisition part acquires physical quantity data showing a physical quantity related to a state of a battery mounted in a vehicle, an observation part that observes a feature related to a state change of the battery on the basis of the physical quantity data at a plurality of different observation times, and a transmission part that transmits a plurality of pieces of feature data which expresses the feature observed each observation time to the server device, and the server device includes a reception part that receives the plurality of pieces of feature data transmitted from the in-vehicle device, and a diagnosis part that diagnoses a deterioration state of the battery on the basis of the plurality of pieces of feature data.

A battery pack includes at least two battery modules arranged in one direction; and a fire extinguishing unit extinguisher having a fire extinguishing tank configured to contain a fire extinguishing agent therein, a pipe connected to the fire extinguishing tank to supply the fire extinguishing agent from the fire extinguishing tank to each of the at least two battery modules, a flow rate adjuster provided to the pipe and configured to adjust a feed flow rate of the fire extinguishing agent to be constant, and at least one valve configured to supply the fire extinguishing agent from the fire extinguishing tank to the battery module having an internal temperature rising over a predetermined temperature.

A battery rack includes a plurality of battery modules arranged in a vertical direction, a rack case including a receiving part having an internal space that is open to a side to receive each of the plurality of battery modules, and a movement part configured to discharge the battery module having a rise in internal temperature above a predetermined temperature, and a tray configured to receive the discharged battery module.

A busbar module includes: busbars fixed to battery cells of a battery module; a plate-like flexible circuit body; and a case that accommodates the circuit body and the busbars, in which the circuit body includes a trunk portion extending in a first direction in which the battery cells are arranged, and branch portions branching from the trunk portion and connected to the busbars, the branch portion includes a base portion, a fixed portion fixed to the busbar, and an intermediate portion extending from the base portion to the fixed portion is the first direction, a first end portion of the trunk portion has a first through-hole, and the case includes a first protrusion and locks the first end portion with the first protrusion to hold the circuit body in a state where the intermediate portion is flexurally deformed.

A busbar module includes: busbars that are fixed to battery cells of a battery module; a plate-like flexible circuit body that includes conductors corresponding to the busbars; and a case that accommodates the circuit body and the busbars, in which the circuit body includes a trunk portion and a branch portion connected to the busbar, the branch portion includes a base layer, a metal foil that is the connection conductor, and a coating layer that covers the base layer and the metal foil, the branch portion has a facing portion faces a first surface of the busbar, the metal foil is connected to a connection target at a portion that is more adjacent to a distal end than the facing portion is, and the first surface has a groove-shaped recess provided at a portion facing the metal foil.

A busbar module includes: a plurality of busbars that are fixed to a plurality of battery cells of a battery module including the plurality of battery cells; and a plate-like flexible circuit body that includes a plurality of connection conductors corresponding to the plurality of busbars, in which the circuit body includes a trunk portion extending in a first direction in which the plurality of battery cells are arranged, and a plurality of branch portions branching from the trunk portion and connected to the busbars, the circuit body includes a first circuit layer and a second circuit layer, and the branch portion has a thin portion composed of any one of the first circuit layer and the second circuit layer, and connects the trunk portion and the busbar in a state where the thin portion is flexurally deformed.

Method for balancing states of charge of an electrical energy store with a plurality of battery cells.

The disclosure relates to a power supply module. The power supply module may include a flexible substrate and a plurality of battery cells distributed in an array on one side of the flexible substrate. Adjacent battery cells of the plurality of battery cells on each line in a first direction may be connected in series by a flexible connector to form a plurality of lines of battery cells, and the plurality of lines of battery cells may be connected in parallel through a first electrode.

A battery pack comprising a slave BMS which diagnoses an error in a battery module. The battery pack includes a master BMS and a first slave BMS. The first slave BMS, when an error has occurred in a first battery module, determines whether or not the error is critical. The first slave BMS communicates with the master BMS in a time segment corresponding to the Identification (ID) of the first slave BMS, changes the ID based on whether or not the error is critical, then outputs information on the error to the master BMS in a time segment corresponding to the changed ID.

An electrical combination. The electrical combination comprises a battery pack configured to be interfaced with a hand held power tool, a control component, and a semiconducting switch. The transfer of power from the battery pack to the hand held power tool is controlled by the control component and the switch based on one of a battery pack state of charge and a respective state of charge of one of a plurality of battery cells. A discharge current of the battery pack is regulated based on the switch being controlled into one of a first state and a second state by the control component to selectively enable the transfer power from the plurality of battery cells to the hand held power tool.