Nissan Motor Company Limited

Envision Aesc Japan Ltd.

Yui Suzuki

Masayuki Nakai

Masahiro Nakamoto

Yasuhiro Yanagihara

Manato Itabashi

Manabu Fukuoka

Shigeki Kayano

A method for assembling a battery pack having a cell group includes stacking the plurality of the unit cells such that distal end portions of the electrode tabs of the unit cells are bent along a stacking direction, disposing a pair of first cover members both ends of the unit cells in the stacking direction, disposing a pair of second cover members on both ends of the unit cells in a direction that intersects with the stacking direction, welding the first and second cover members while the cell group is pressurized using the first cover members. The welding of the first cover members and the second cover members is performed prior to electrically connecting the unit cells by a bus bar. The method further includes laser-welding the bus bar to distal end portions of the electrode tabs after the first cover members and the second cover members are welded.

Method for assembling battery pack, and battery pack

A battery pack includes a cell group, a spacer, a plurality of bus bars, and a bus bar holder. The cell group includes stacked unit cells, each including a cell body having a power generation element and an electrode tab having distal end portions bent along the stacking direction. The spacer is disposed between adjacent electrode tabs. The bus bars electrically connect the electrode tabs to each other. The bus bar holder that holds the bus bars. The bus bar holder includes a restricting member disposed between adjacent electrode tabs, and extends along the stacking direction to restrict the electrode tabs by sandwiching the electrode tabs with the spacer. Portions of the electrode tabs are welded to a surface of the bus bars facing the unit cells when the stacking direction positions of the portions of the electrode tabs are restricted by the restricting member and the spacer.

Battery pack

A battery module has at least one individual cell and a housing. The individual cell has a power generating element with positive and negative electrodes stacked with a separator therebetween and sealed by a cladding material. The housing has a pair of cases that sandwiches the cell from opposite sides and a plate shaped reinforcing member joined to and reinforcing one of the cases. One of the cases has a bulging portion, a first extension portion, an inclined portion and a second extension portion. The bulging portion protrudes toward and presses the cell. The first extension portion extends transversely from the bulging portion with respect to the stacking direction. The inclined portion extends from the first extension portion while sloping toward the cell. The second extension portion extends transversely from the inclined portion with respect to the stacking direction. The second extension portion is joined to the reinforcing member.

Battery module

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Kanagawa, Japan

Yui Suzuki