Heat absorber and secondary battery module

Abstract

The problem of this disclosure is to provide a heat absorber that can deform sufficiently in response to the expansion of a battery cell to absorb the expansion of the battery cell, and that has a restoring force that restores it to its shape before deformation. The solution is a heat absorber (1) having contents (4) containing an aqueous solvent, a filling section (5) into which the contents (4) are filled, and a storage section (6) capable of accommodating the contents (4) that have been deformed by the application of an external force to the filling section (5), and a restoring member (3) that returns the contents (4) contained in the storage section (6) to the filling section (5), characterized in that the deformed state in which the contents (4) are contained in the storage section (6) due to the deformation of the filling section (5) by an external force, and the normal state in which the contents (4) contained in the storage section (6) are returned to the filling section (5) by the restoring member (3), are reversible.

Claims

1. Contents containing an aqueous solvent, A bag body having a filling section into which the contents are filled, and a storage section capable of accommodating the contents that have been deformed by the application of an external force to the filling section, It has a restoring member that returns the contents contained in the storage section back to the filling section, A heat-absorbing body characterized in that the deformed state in which the contents are contained in the housing due to the deformation of the filling portion by the external force, and the normal state in which the contents contained in the housing are returned to the filling portion by the restoring member, are reversible.

2. The heat-absorbing body according to claim 1, wherein the housing expands in conjunction with the housing of the contents, and the expanded housing contracts due to the restoration member.

3. The heat-absorbing body according to claim 1 or 2, wherein the maximum capacity of the housing portion is 5% by volume or more and 100% by volume or less of the maximum capacity of the filling portion.

4. The heat-absorbing material according to claim 1 or 2, wherein the maximum volume of the filling portion is 50% or more and 95% or less of the maximum volume of the bag body.

5. The heat-absorbing body according to claim 1 or 2, wherein the restoring member is an elastic member or a pair of magnets that contract the expanded housing to control the volume of the housing.

6. The bag body is in the form of a sheet, and The heat-absorbing body according to claim 5, wherein the elastic member or the pair of magnets are attached in contact with the surface of the bag body so as to extend in the in-plane direction of the surface of the bag body.

7. The heat-absorbing body according to claim 6, wherein the elastic member is a leaf spring.

8. The contents are a hydrogel having voids, comprising the aqueous solvent and the hydrogel body. The heat-absorbing body according to claim 1, wherein the hydrogel is the restorative member.

9. The heat absorber according to claim 8, wherein the deformed state in which the deformed portion due to the deformation of the hydrogel is contained in the void which is the containment portion is reversible to the normal state by the restoration of the hydrogel.

10. The heat-absorbing body according to claim 8 or 9, wherein the void is an open void that is open to the surface of the hydrogel.

11. The heat-absorbing body according to claim 8 or 9, wherein the void is an independent void that exists closed within the hydrogel.

12. The heat-absorbing body according to claim 1 or 2, wherein the contents further include inorganic powder.

13. The heat-absorbing body according to claim 1 or 2, wherein the contents further contain one or more selected from the group consisting of antifreeze agents and inorganic fibers.

14. The heat-absorbing body according to claim 12, wherein the contents change into a porous body when the contents are heated to 120°C or higher.

15. A secondary battery module comprising the heat-absorbing element described in claim 1 or 2.

16. A secondary battery module in which the heat-absorbing material according to claim 1 or 2 is sandwiched between battery cells.

Images