Battery pack

Abstract

The present invention provides a battery pack capable of suppressing the occurrence of a thermal chain reaction in a battery module containing a single battery cell when that cell experiences thermal runaway. [Solution] A first restraint plate 51R of the first battery module 40 facing the second battery module 60 has at least one first through-hole 54R facing at least one first battery cell 43, and a second restraint plate 71L of the second battery module facing the first battery module has at least one second through-hole 74L facing at least one second battery cell 63 and facing a portion where the first through-hole is not formed.

Claims

1. A first battery module comprising: a plurality of first battery cells stacked in a predetermined first direction and having a first cell case; a pair of first end plates that sandwich the first battery cells in the first direction; and a pair of first restraint plates connected to the pair of first end plates and located on both sides of the first battery cells along a second direction perpendicular to the first direction; A second battery module comprising: a plurality of second battery cells stacked in the first direction and having a second cell case; a pair of second end plates sandwiching the second battery cells in the first direction; and a pair of second restraint plates connected to the pair of second end plates and positioned on both sides of the second battery cells along the second direction; Equipped with, The first restraint plate facing the second battery module has at least one first through-hole facing at least one first battery cell, The battery pack wherein the second restraint plate facing the first battery module has at least one second through-hole formed therein, which faces at least one second battery cell and faces a portion of the first restraint plate where the first through-hole is not formed.

2. The first cell case is rectangular in shape, The pair of first restraint plates and the pair of sides of the first cell case each face each other in the second direction, The second cell case is rectangular in shape, The battery pack according to claim 1, wherein the pair of second restraint plates and the pair of sides of the second cell case each face the second direction.

3. The first battery module has a pair of resin first cover members positioned between a pair of metal first restraint plates and a pair of the side surfaces of the first cell case, The battery pack according to claim 2, wherein the first cover member has a first opening formed thereon that faces the first through hole of the first restraint plate.

4. The battery pack according to claim 3, wherein a pair of first cover members have a pair of first clamping portions that clamp the first cell case from a third direction perpendicular to the first and second directions.

5. The battery pack according to claim 3 or claim 4, wherein the first through-hole and the first opening, which are opposite each other, have the same shape.

6. The second battery module has a pair of resin second cover members positioned between a pair of metal second restraint plates and a pair of sides of the second cell case, The battery pack according to claim 2, wherein the second cover member has a second opening formed thereon that faces the second through hole of the second restraint plate.

7. The battery pack according to claim 6, wherein the pair of second cover members have a pair of second clamping portions that clamp the second cell case from a third direction perpendicular to the first and second directions.

8. The battery pack according to claim 6 or claim 7, wherein the second through-hole and the second opening, which are opposite each other, have the same shape.

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