Battery pack

The battery pack design with protrusions and through-holes in the case improves heat dissipation by maintaining close contact between the heat dissipation sheet and the case sides, addressing inefficiencies in existing designs.

JP7754290B2Active Publication Date: 2025-10-15MURATA MFG CO LTD
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Patent Information

Application Number
JP2024511320
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-03-30
Filing Date
2023-01-30
Publication Date
2025-10-15
Estimated Expiration
2043-01-30

AI Technical Summary

Technical Problem

Existing battery packs face inefficiencies in heat dissipation due to thermal resistance and limited contact area between the battery holder and the case, hindering effective heat dissipation from battery cells.

Method used

A battery pack design featuring a battery holder with protrusions that fit into through-holes in the outer case, allowing for close contact between a heat dissipation sheet and the case sides, while using materials with different flexural moduli to facilitate elastic deformation and secure positioning, ensuring efficient heat transfer.

Benefits of technology

The design enhances heat dissipation by maintaining close contact between the heat dissipation sheet and the case sides, effectively conducting heat away from the battery cells, thus preventing thermal resistance and peeling, and ensuring smooth installation.

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Abstract

This battery pack has: a battery cell assembly that includes a plurality of battery cells, and a battery holder in which the plurality of battery cells are accommodated; and an external case that includes a bottom plate, and a plurality of side plates which intersect with the bottom plate at the peripheral edge of the bottom plate, and that accommodates the battery holder. The battery holder has side parts that face the side plates of the external case. The battery holder is provided with at least one projecting part projecting from one of the side parts. One of the side plates of the external case is provided with a through hole that the projecting part is inserted into. When a portion of the battery cell assembly makes contact with an inner surface of the side plates of the external case and the battery holder is not accommodated in the external case, the distance between an outer surface of the battery cell assembly corresponding to a first side part and an outer surface of the battery cell assembly corresponding to a second side part is equal to or greater than the distance between a first side plate and a second side plate of the external case.
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