battery cell

JP7871796B2Active Publication Date: 2026-06-09TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2023-12-14
Publication Date
2026-06-09

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Abstract

To provide a battery cell in which release of gas at the time of discharging or charging can be suppressed while an electrode body is being restrained.SOLUTION: A battery cell 20 includes: a long electrode body 19 formed by laminating a positive electrode, a negative electrode, and a separator; band-like tapes 30, 32, 34, 36, 38 extending in a shorter direction of the electrode body 19 and wound around the electrode body 19; and a laminate film for sealing the electrode body 19 with the tapes 30, 32, 34, 36, and 38 wound therearound, while storing the electrode body 19. In a part of the adhesive surface of the tapes 30, 32, 34, 36, and 38 which adheres to the electrode body 19, recessed parts 30A, 32A, 34A, 36A, 38A, which are more recessed than the other parts, are provided.SELECTED DRAWING: Figure 5
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Claims

1. A long electrode body formed by stacking a positive electrode, a negative electrode, and a separator, A strip-shaped tape extending in the short direction of the electrode body and wrapped around the outer circumference of the electrode body, A laminate film that seals the electrode body with the tape wrapped around it, It has, In the aforementioned tape, a portion of the adhesive surface that adheres to the electrode body is provided with a recess that is more recessed than other portions. Battery cell.

2. The battery cell according to claim 1, wherein the recess is spaced apart from the surface of the electrode body when unloaded.

3. The battery cell according to claim 1 or claim 2, wherein the tape is provided in multiple locations at intervals in the longitudinal direction of the electrode body.

4. The battery cell according to claim 3, wherein at least one of the plurality of tapes is provided in the central portion in the longitudinal direction of the electrode body.

5. Multiple recesses are provided, The battery cell according to claim 4, wherein at least a portion of the recesses in adjacent tapes, viewed from the longitudinal direction of the electrode bodies, overlaps.