Battery cell and battery pack

By incorporating a flow guide and a flow deflector into the insulating components, the problem of electrolyte impacting the positive and negative electrode plates during secondary battery electrolyte injection is solved, achieving efficient electrolyte injection and improved safety performance.

WO2026145745A1PCT designated stage Publication Date: 2026-07-09SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
Filing Date
2025-12-31
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

In existing secondary batteries, during the electrolyte injection process, the electrolyte directly impacts the positive and negative electrode plates, causing active materials to detach, increasing safety hazards and potentially causing short circuits.

Method used

A flow guiding section and a first flow blocking section are provided in the insulating component. By limiting the ratio and size relationship between the flow blocking section and the through hole, a flow guiding channel is formed, which reduces the direct impact of electrolyte on the electrode assembly and avoids short circuit between the electrode tab and the top cover.

Benefits of technology

It improves the liquid injection efficiency of secondary batteries, reduces the risk of active material shedding and short circuits, and enhances the safety performance of batteries.

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Abstract

The embodiments of present application relate to the technical field of batteries. Specifically disclosed in the embodiments of the present application are a battery cell and a battery pack. The battery cell comprises: a housing, provided with an accommodating cavity; an electrode assembly, provided in the accommodating cavity; a top cover, connected to one side of the housing in a first direction and covering and sealing the accommodating cavity, wherein the top cover is provided with a liquid injection hole; and an insulating member, the insulating member comprising an insulating main body, a plurality of flow guiding portions and a plurality of first flow blocking portions, wherein the insulating main body is provided with a through hole, the through hole is communicated with the liquid injection hole, the plurality of flow guiding portions are arranged around the periphery of the through hole so as to form a flow guiding channel having an opening, the flow guiding channel is communicated with the through hole, the opening communicates the flow guiding channel with the accommodating cavity, and the first flow blocking portions block part of the opening. The present application avoids short circuit of the battery cell caused by tabs of the electrode assembly extending into the through hole and being in contact with the top cover, thus reducing the risk of short circuit between the electrode assembly and the top cover, and ensuring the safety performance of the battery cell.
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