BATTERY MODULE

PROBLEM TO BE SOLVED: To provide a battery module in which discharge speed of internal gas, by means of an open valve, can be improved.SOLUTION: A battery module 1 includes an open valve 12 for releasing the pressure in the enclosure 5 to the outside, when the internal pressure of the enclosure reaches a threshold level. The open valve 12 has an opening 13 provided in the enclosure 5, a valve body 15 placed on the external surface 5a of the enclosure 5 so as to close the opening 13, and a cover 16 to be attached to the enclosure 5 while energizing the valve body 15 to the external surface 5a of the enclosure 5. Internal surface 5b of the enclosure 5, where the internal surface side opening end 13b of the opening 13 is located, is a flat surface, and the cross sectional area of the opening 13 decreases continuously or gradually from the internal surface 5b of the enclosure 5 toward the external surface 5a thereof.SELECTED DRAWING: Figure 1 【課題】開放弁による内部ガスの排出速度を向上することができる電池モジュールを提供する。【解決手段】電池モジュール１は、筐体５の内圧が閾値に到達したときに筐体内の圧力を外部に開放する開放弁１２を備え、開放弁１２は、筐体５に設けられた開口部１３と、開口部１３を塞ぐように筐体５の外面５ａに配置された弁体１５と、弁体１５を筐体５の外面５ａに付勢した状態で筐体５に取り付けられるカバー１６と、を有し、開口部１３の内面側開口端１３ｂが位置する筐体５の内面５ｂは、平坦面となっており、開口部１３の断面積は、筐体５の内面５ｂから外面５ａに向かって連続的又は段階的に小さくなっている。【選択図】図１