Energy storage device for a motor vehicle and method for counteracting a fire of an energy storage device
An energy storage device for a motor vehicle includes a battery module and at least one thermally insulating filling element, which is preferably designed as a thermally insulating cell separator element arranged between two battery cells of the battery module. The filling element is designed to be soluble here, so that it dissolves at least in part when it comes into contact with a specific minimum amount of a specific liquid.
1 . An energy storage device for a motor vehicle, comprising:
a battery module including at least two battery cells arranged adjacent to one another in a first direction; and
a thermally insulating filling element, the thermally insulating filling element being a cell separator element arranged between the two battery cells,
wherein the thermally insulating filling element is configured to absorb and bind water in an amount less than a specific minimum amount of water without dissolving, and to dissolve at least in part and be flushed out from between the two battery cells when contacted with water in an amount greater than the specific minimum amount of water, thereby opening a flow space for the water between the two battery cells.
2 . The energy storage device according to claim 1 , wherein the cell separator element comprises a hydrophilic aerogel.
3 . The energy storage device according to claim 1 , wherein the battery module includes a plurality of thermally insulating cell separator elements, and a respective one of the thermally insulating cell separator elements is arranged between each pair of battery cells that are adjacent to one another in the first direction.
4 . The energy storage device according to claim 1 , further comprising a thermally insulating filling element arranged in an intermediate space which is not located between two battery cells of the same battery module and which is arranged outside of the cell stack formed by the battery cells of the battery module.
5 . A method for counteracting a fire of an energy storage device for a motor vehicle, the energy storage device including a battery module having at least two battery cells arranged adjacent to one another in a first direction and a thermally insulating filling element, the thermally insulating filling element being a cell separator element arranged between the two battery cells, the method comprising:
supplying water to the energy storage device,
wherein the cell separator element absorbs and binds the water without dissolving when the supplied water is less than a specific minimum amount of water, and
wherein the cell separator element dissolves at least in part and is flushed out from between the two battery cells when the supplied water is greater than the specific minimum amount of water, thereby opening a flow space for the water between the two battery cells.
6 . The energy storage device of claim 1 , wherein the cell separator element comprises a superabsorbent material embedded in a water-soluble matrix.
7 . The energy storage device of claim 1 , wherein the cell separator element comprises ceramic fibers embedded in a matrix, and wherein the matrix dissolves upon contact with at least the specific minimum amount of water.
8 . The method of claim 5 , wherein the cell separator element comprises a hydrophilic aerogel.
9 . The method of claim 5 , wherein the battery module includes a plurality of thermally insulating cell separator elements, and a respective one of the thermally insulating cell separator elements is arranged between each pair of battery cells that are adjacent to one another in the first direction.
10 . The method of claim 5 , wherein the energy storage device further comprises a thermally insulating filling element arranged in an intermediate space which is not located between two battery cells of the same battery module and which is arranged outside of the cell stack formed by the battery cells of the battery module.
11 . The method of claim 5 , wherein the cell separator element comprises a superabsorbent material embedded in a water-soluble matrix.
12 . The method of claim 5 , wherein the cell separator element comprises ceramic fibers embedded in a matrix, and wherein the matrix dissolves upon contact with at least the specific minimum amount of water.