Secondary battery and battery pack including the same
A secondary battery includes an electrode assembly, a battery case surrounding the electrode assembly, and a sealing member located between the electrode assembly and the battery case. The sealing member includes polymer particles that are configured to expand in all directions.
1 . A secondary battery comprising:
an electrode assembly,
a battery case surrounding the electrode assembly, and
a sealing member located between the electrode assembly and the battery case,
wherein the sealing member includes polymer particles that are expandable in all directions,
wherein the polymer particles include a super absorbent polymer,
wherein the battery case comprises a non-aqueous electrode solution, and the super absorbent polymer is configured to absorb the non-aqueous electrolyte solution to expand in all directions.
2 . The secondary battery according to claim 1 , wherein the sealing member includes an adhesive layer, and
wherein the polymer particles are located on the adhesive layer.
3 . The secondary battery according to claim 2 , wherein the adhesive layer contacts the electrode assembly.
4 . The secondary battery according to claim 2 , wherein the polymer particles are mixed with a polyurethane material or a polyacrylate material to form a film layer.
5 . The secondary battery according to claim 4 , wherein the film layer is configured to expand in a surface direction of the adhesive layer and a direction perpendicular to the surface direction.
6 . The secondary battery according to claim 1 , wherein the sealing member is configured to fill a gap between the electrode assembly and the battery case.
7 . The secondary battery according to claim 1 , wherein the sealing member is provided as a plurality of sub-sealing members separated from each other.
8 . The secondary battery according to claim 1 , wherein the battery case is cylindrical.
9 . A battery pack comprising the secondary battery according to claim 1 .
10 . The secondary battery according to claim 1 , wherein the polymer particles comprise expanded polymer particles that are expanded in the directions.
11 . The secondary battery according to claim 1 , wherein the polymer particles are configured to expand in the directions in a state of the sealing member being disposed between the electrode assembly and the battery case and exposed to an electrolyte.
12 . The secondary battery according to claim 1 , wherein the polymer particles comprise expanded polymer particles that are formed by expanding polymer particles in the directions.
13 . The secondary battery according to claim 1 , wherein the super absorbent polymer is a non-hydrated super absorbent polymer.
14 . The secondary battery according to claim 1 , wherein the super absorbent polymer comprises swollen super absorbent polymer particles absorbed with non-aqueous electrolyte solution, and
wherein the sealing member comprises a stable film layer comprising the swollen super absorbent polymer particles and a polymer material matrix comprising a polyurethane material or a polyacrylate material.
15 . A secondary battery comprising:
an electrode assembly,
a battery case surrounding the electrode assembly, and
a sealing member located between the electrode assembly and the battery case,
wherein the sealing member includes polymer particles that are expandable in all directions,
wherein the polymer particles include a super absorbent polymer, and
wherein the super absorbent polymer is a non-hydrated super absorbent polymer.
16 . A secondary battery comprising:
an electrode assembly,
a battery case surrounding the electrode assembly, and
a sealing member located between the electrode assembly and the battery case,
wherein the sealing member includes polymer particles that are expandable in all directions,
wherein the polymer particles include a super absorbent polymer,
wherein the super absorbent polymer comprises swollen super absorbent polymer particles absorbed with non-aqueous electrolyte solution, and
wherein the sealing member comprises a stable film layer comprising the swollen super absorbent polymer particles and a polymer material matrix comprising a polyurethane material or a polyacrylate material.