Battery module including gas cutoff structure
A battery module has a structure capable of preventing spread of flames when fire breaks out in the battery module, and more particularly a battery module including a plurality of battery cell module assemblies, each of the battery cell module assemblies including battery cells arranged in tight contact with each other, a side plate electrically connected to electrode leads of the battery cell module assemblies, a duct disposed outside the side plate, and a gas cutoff structure disposed in the duct, wherein the plurality of battery cell module assemblies is disposed so as to have a space therebetween.
1 . A battery module comprising:
a plurality of battery cell module assemblies, each of the plurality of battery cell module assemblies comprising a plurality of battery cells arranged in contact with each other;
a side plate electrically connected to electrode leads of the plurality of battery cell module assemblies;
a duct formed between the side plate and an external wall spaced from the side plate; and
a gas cutoff disposed in the duct,
wherein the plurality of battery cell module assemblies is disposed so as to have a space therebetween,
wherein the gas cutoff comprises a cutoff membrane configured to open and close the duct, a temperature fuse connected to a first end of the cutoff membrane, and an elastic body connected to a second end of the cutoff membrane opposite the first end of the cutoff membrane,
wherein, when heat is generated in the battery module, the temperature fuse is cut off, the cutoff membrane is rotated by elastic force of the elastic body, whereby a flow of gas through the duct is cut off, and
wherein an inner surface of the duct is provided with a projection configured to stop rotation of the cutoff membrane.
2 . The battery module according to claim 1 , wherein the side plate has an open structure such that the plurality of battery cell module assemblies communicate with the duct.
3 . The battery module according to claim 1 , wherein each of the plurality of battery cell module assemblies has a housing receiving the plurality of battery cells, and
wherein an open surface of the housing is coupled to the side plate.
4 . The battery module according to claim 1 , wherein the side plate has an integrated structure that covers an entire side surface of the battery module in which the electrode leads of the plurality of battery cell module assemblies protrude.
5 . The battery module according to claim 1 , wherein the gas cutoff is disposed in the duct at a position corresponding to the space.
6 . The battery module according to claim 1 , wherein the projection is formed by a portion of the duct being depressed inwards or a protrusion attached to the inner surface of the duct.
7 . A battery pack comprising the battery module according to claim 1 .
8 . The battery module according to claim 1 , wherein the cutoff membrane comprises two blades extending from a central axis for rotation, and
wherein the blades have a straight shape or a spiral shape when viewed from one end of the central axis.
9 . The battery module according to claim 1 , wherein the cutoff membrane is rotatable about a central axis formed between the side plate and the external wall.
10 . The battery module according to claim 1 , wherein the plurality of battery cell module assemblies are stacked in a first direction,
wherein the duct extends in the first direction, and
wherein the gas cutoff blocks flow in the first direction when closed.
11 . The battery module according to claim 1 , wherein the side plate comprises a first side plate and a second side plate located respectively at opposite ends of the plurality of battery cell module assemblies in an overall length direction thereof, and
wherein a first duct is located outside the first side plate and a second duct is located outside the second side plate.
12 . The battery module according to claim 11 , wherein a refrigerant is introduced through a first end of the first duct, passes through the plurality of battery cell module assemblies, and is discharged through a second end of the second duct.