A busbar for a battery pack, intended to electrically connect at least one electrochemical accumulator battery of the pack, preferably to electrically connect several electrochemical accumulator batteries of the pack to one another, including an electrically conductive and sealtight envelope itself intended to channel the current of the accumulator batteries and designed to contain a heat transfer liquid whose vaporization temperature is chosen so as to be between a value close to 90% of the self-heating temperature and a value close to 110% of the thermal runaway temperature of the accumulator batteries of the pack, the sealtight envelope being designed to guarantee an injection of heat transfer liquid as close as possible to each accumulator battery to which it is intended to be connected, preferably close to at least one of its output terminals.

An electrical storage module includes an insulating substrate that opposes an electrical storage group including a plurality of electrical storage devices and includes a plurality of through-holes, a plurality of current collecting foils that are arranged side by side at intervals from each other on a first surface of the insulating substrate on a side opposite to a surface that opposes the electrical storage group, and an insulating sheet that is disposed to cover the plurality of current collecting foils. The plurality of current collecting foils include a first current collecting foil and a second current collecting foil that are adjacent to each other at an interval in a direction parallel to the first surface. The first current collecting foil includes a first lead part in a tongue shape that extends from an edge, is inserted into a hole of the insulating substrate, and is electrically connected to a positive electrode of a battery, and the second current collecting foil includes a second lead part in a tongue shape that extends from the edge, is inserted into the hole of the insulating substrate, and is electrically connected to a negative electrode of the battery.

A member for electric conduction, comprising a metal member and a resin member that is joined to at least a part of a surface of the metal member, the metal member having a roughness index, which is obtained by dividing a true surface area (m.sup.2) measured by a krypton adsorption method by a geometric surface area (m.sup.2), of 4.0 or more.

A member for electric conduction, comprising a metal member and a resin member that is joined to at least a part of a surface of the metal member, the metal member having a roughness index, which is obtained by dividing a true surface area (m.sup.2) measured by a krypton adsorption method by a geometric surface area (m.sup.2), of 4.0 or more.

A busbar module includes: a circuit body having a flexible circuit board; busbars; and a holder. The circuit body has: conductor layers and protective layers to form a multiple-layered structure of wiring patterns; a band-shaped main strip to be located to extend in a stacking direction of cells; and a band-shaped branch strip branched from the main strip. The branch strip has: a bent portion extending in the stacking direction and having a bent shape around an axis crossing the stacking direction; and a connection portion disposed closer to an end of the branch strip than the bent portion and connected to the corresponding busbar. The bent portion has a thin-layer portion having a shape formed by removing, from the flexible circuit board, a part of the protective layers corresponding to a part of the conductor layers without being used as the wiring pattern in the branch strip.

A busbar module includes: a circuit body having a flexible circuit board; busbars; and a holder. The circuit body has: conductor layers and protective layers to form a multiple-layered structure of wiring patterns; a band-shaped main strip to be located to extend in a stacking direction of cells; and a band-shaped branch strip branched from the main strip. The branch strip has: a bent portion extending in the stacking direction and having a bent shape around an axis crossing the stacking direction; and a connection portion disposed closer to an end of the branch strip than the bent portion and connected to the corresponding busbar. The bent portion has a thin-layer portion having a shape formed by removing, from the flexible circuit board, a part of the protective layers corresponding to a part of the conductor layers without being used as the wiring pattern in the branch strip.

A high voltage distribution system is provided with multiple fuses. The high voltage distribution system includes multiple laminated busbars that are electrically coupled to a battery and to the multiple fuses. Busbars are electrically coupled to the one or more fuses via electrical connections between the busbars and the fuses. The electrical connections can pass through other busbars without having an electrical coupling to the other busbars. An insulating layer may be used between the busbars to prevent overcurrent events. The configuration, size, and position of each busbar is selected based on the electrical requirements of components that are electrically coupled to the busbar and based on the prevention of overcurrent events.

A high voltage distribution system is provided with multiple fuses. The high voltage distribution system includes multiple laminated busbars that are electrically coupled to a battery and to the multiple fuses. Busbars are electrically coupled to the one or more fuses via electrical connections between the busbars and the fuses. The electrical connections can pass through other busbars without having an electrical coupling to the other busbars. An insulating layer may be used between the busbars to prevent overcurrent events. The configuration, size, and position of each busbar is selected based on the electrical requirements of components that are electrically coupled to the busbar and based on the prevention of overcurrent events.

The present disclosure relates to a battery module that includes a stack of battery cells, where each battery cell has a terminal, and the terminal has a first alloy of a metal. The battery module has a bus bar that includes a body having a second alloy of the metal, nickel plating on at least a portion of the body, and an indentation disposed on the body, where a thickness of the nickel plating is between 0.2% and 20% of an overall thickness of the body, and a weld physically and electrically coupling the respective terminal to the bus bar. The indentation has a depth between 10% and 90% of the overall thickness, an area of the indentation is between 5% and 20% of an overall area of the body, and the nickel plating enables the weld to be stronger than a weld between the first and second alloys.

A battery module for use with a controller includes a printed circuit board assembly (PCBA) mounted to a plurality of battery cells. The PCBA includes a substrate, a radio frequency (RF) communications circuit, a cell sensing circuit, and a conductive interconnecting member. The cell sensing circuit is operable for measuring a respective cell voltage of each of the battery cells. The conductive interconnect member forms an electrical connection between the battery cells. The RF communications circuit is in wireless communication with the controller and is operable for wirelessly transmitting the measured cell voltages to the controller. A battery system includes a master battery controller and the battery pack. A vehicle includes an electric machine operable for generating output torque for propelling the vehicle, as well as the battery system noted above.