Battery module, and electric apparatus powered by the battery module
A battery includes a plurality of battery cells arranged in a first direction. The battery cell includes a first wall and a second wall that intersect, the first wall is provided with a pressure relief mechanism, and a protective member is disposed between the second wall and an inner wall of a box. The pressure relief mechanism and the protective member are disposed on two different walls of the battery cell respectively. When emissions produced by thermal runaway of the battery are discharged from the pressure relief mechanism disposed on the first wall, if some emissions fall between the second wall of the battery cell and the inner wall of the box, under the protective effect of the protective member, electrical connection between the second wall of the battery cell and the inner wall of the box can be effectively avoided, thereby reducing the risk of short circuit.
1 . A battery, comprising:
a plurality of battery cells arranged in a first direction to form a row of battery cells, wherein each battery cell comprises a first wall that faces a second direction, and a second wall that faces a third direction, the first direction, the second direction and the third direction are perpendicular to each other, the first wall is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to be actuated when internal pressure or temperature of the battery cell reaches a threshold, so as to relieve the internal pressure of the battery cell;
a box, configured to accommodate the plurality of battery cells, and an inner wall of the box faces the second walls of the battery cells; and
a protective member, disposed between second walls of the battery cells and the inner wall of the box, wherein the protective member is configured to prevent emissions from any of the battery cells from causing an electrical connection between the second wall of the battery cell and the inner wall of the box when the pressure relief mechanism of the battery cell is actuated:
wherein the protective member is a rectangular flat sheet that extends along the first direction in length and along the second direction in width, and a width of the protective member is greater than or equal to 2 millimeters and less than or equal to a height of the battery cells in the second direction.
2 . The battery according to claim 1 , wherein the protective member is fastened to the second walls of the battery cells and/or the inner wall of the box.
3 . The battery according to claim 2 , wherein the protective member is bonded to the second walls of the battery cells and/or the inner wall of the box.
4 . The battery according to claim 2 , wherein the battery further comprises a fastening band, wherein the fastening band is disposed around the periphery of the plurality of battery cells, and the fastening band is configured to fasten the protective member to the second walls of the battery cells.
5 . The battery according to claim 2 , wherein the protective member comprises a first protective member and a second protective member that are separated, wherein the first protective member is configured to be fixedly connected to the second walls of the battery cells, and the second protective member is configured to be fixedly connected to the inner wall of the box.
6 . The battery according to claim 1 , wherein the protective member is an insulation coating layer applied onto the second walls of the battery cells and/or the inner wall of the box.
7 . The battery according to claim 1 , wherein the box is provided with a structural beam, wherein the structural beam is configured to separate an inner space of the box into a plurality of accommodating cavities, each of the accommodating cavities is configured to accommodate at least one battery cell, and the protective member is disposed between the second wall of the battery cell and a cavity wall of the accommodating cavity.
8 . The battery according to claim 1 , wherein a thickness of the protective member is greater than or equal to 0.1 millimeter and less than or equal to 1 millimeter.
9 . The battery according to claim 1 , wherein a melting point of the protective member is higher than 100° C.
10 . The battery according to claim 1 , wherein a distance between the second walls of the battery cells and the inner wall of the box is greater than 3 millimeters.
11 . The battery according to claim 1 , wherein the battery further comprises:
a binder for fastening the plurality of battery cells to the box, wherein at least part of the binder is located between the second walls of the battery cells and the inner wall of the box, so as to prevent emissions from any of the battery cells from causing electrical connection between the second walls of the battery cells and the inner wall of the box.
12 . The battery according to claim 11 , wherein a thickness of the at least part of the binder located between the second walls of the battery cells and the inner wall of the box is greater than 2 millimeters.
13 . An electric apparatus, comprising the battery according to claim 1 , wherein the battery is configured to supply electric energy.