Battery module having pressure dependent heat exchange members

1. A battery module, comprising:

at least one secondary battery;

a module case having an inner space formed therein to accommodate the at least one secondary battery in the inner space; and

at least one heat pressure exchange member disposed to face the at least one secondary battery in the inner space of the module case, the at least one heat pressure exchange member made of a solid material having a constant thickness which absorbs and retains heat when a pressure applied from the secondary battery is equal to or less than a reference value and releases the retained heat when the pressure applied from the secondary battery is higher than the reference value,

wherein the at least one heat pressure exchange member includes a first material, a second material, the second material absorbing and retaining heat depending on whether a pressure is applied and a third material between the first material and the second material in a height direction of the at least one heat pressure exchange member,

wherein a lower edge of the third material is joined to an upper edge of the first material and an upper edge of the third material is joined to a lower edge of the second material, and

wherein the third material has a lower thermal conductivity than the first material.

2. The battery module according to claim 1 , wherein a top edge of the first material forms a top edge of the at least one heat pressure exchange member, and

wherein a bottom edge of the second material forms a bottom edge of the at least one heat pressure exchange member.

3. A battery pack, comprising the battery module according to claim 1 .

4. A vehicle, comprising the battery module according to claim 1 .