Secondary batteries

Abstract

A secondary battery is provided comprising: a stacked electrode assembly in which multiple unit batteries are stacked in a first direction and electrode leads are provided at both ends in a second direction perpendicular to the first direction; a multifunctional terminal block (MTB) provided at both ends of the stacked electrode assembly; and a laminate sheet covering the sides of the stacked electrode assembly, wherein the MTB includes a fusion resin layer on its sides.

Claims

1. A stacked electrode assembly comprising multiple unit batteries stacked in a first direction, with electrode leads at both ends in a second direction perpendicular to the first direction, A multi-functional terminal block (MTB) provided at both ends of the stacked electrode assembly, The assembly includes a laminate sheet that encloses the side surface of the stacked electrode assembly, The aforementioned MTB is a secondary battery that includes a fused resin layer on its side surface.

2. The laminate sheet overlaps at least partially with the side of the MTB, The secondary battery according to claim 1, wherein the laminate sheet is fused to the fusion resin layer.

3. The aforementioned laminate sheet is: A flexible metal layer, An internal resin layer provided on one side of the metal layer, The metal layer includes an external resin layer provided on the other side of the aforementioned metal layer, The secondary battery according to claim 1 or 2, wherein the internal resin layer comprises unstretched polypropylene.

4. The secondary battery according to claim 3, wherein the fused resin layer is fused to the internal resin layer.

5. The secondary battery according to claim 3, wherein the fused resin layer comprises a polypropylene resin.

6. The secondary battery according to claim 3, wherein the fused resin layer includes an extension that extends from the edge of the laminate sheet along the side of the MTB.

7. The secondary battery according to claim 3, wherein the side surface of the MTB is at least partially roughened.

8. The secondary battery according to claim 7, wherein the fused resin layer covers the roughened portion of the MTB.

9. The secondary battery according to claim 7, wherein the side surface of the MTB is roughened by surface etching.

10. The aforementioned MTB is, The electrode terminal portion electrically connected to the electrode lead of the stacked electrode assembly, A secondary battery according to claim 1, comprising a venting disc that ruptures to release gas when the internal pressure increases.

11. The secondary battery according to claim 10, wherein the MTB further includes a busbar that electrically connects the electrode leads of the stacked electrode assembly to the electrode terminal portion.

12. A stack-type electrode assembly comprising multiple unit batteries stacked in a first direction, extending in a second direction perpendicular to the first direction, and having electrode leads at its ends, A multi-functional terminal block (MTB) is coupled to the electrode leads of the stacked electrode assembly and includes an electrode terminal portion and a busbar. The assembly includes a laminate sheet that encloses the stacked electrode assembly together with the MTB, The side of the aforementioned MTB is roughened, and it is a secondary battery.

13. The secondary battery according to claim 12, wherein the roughened side surface of the MTB is at least partially covered with a fused resin layer.

14. The aforementioned laminate sheet is: A flexible metal layer, An internal resin layer provided on one side of the metal layer, The metal layer includes an external resin layer provided on the other side of the aforementioned metal layer, The secondary battery according to claim 13, wherein the internal resin layer is fused with the fused resin layer.

15. The secondary battery according to claim 13, wherein the fused resin layer includes an extension that extends from the edge of the laminate sheet along the side of the MTB.

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