Secondary battery, battery module, battery pack, and electric device

By placing the projection of the negative electrode within the projection of the positive electrode in the secondary battery, and adjusting the size and specific capacity distribution of the electrodes, the problem of low space occupancy of the positive electrode is solved, thereby improving energy density and safety performance.

CN118451582BActive Publication Date: 2026-06-26CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2022-08-24
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

How to improve the space utilization rate of the positive electrode plate of a secondary battery in order to enhance the performance of the secondary battery, especially its energy density and safety performance.

Method used

By placing the projection of the negative electrode within the projection of the positive electrode, the negative electrode has a larger area, covering the positive electrode. This adjusts the size and specific capacity distribution of the positive and negative electrodes, ensuring that metal ions are embedded in the negative electrode active material and reducing the risk of metal ion precipitation.

Benefits of technology

It improves the space utilization rate of the positive electrode, enhances the energy density and safety performance of the secondary battery, reduces the risk of metal dendrite formation, and improves the consistency of overall dynamic performance.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN118451582B_ABST
    Figure CN118451582B_ABST
Patent Text Reader

Abstract

Provided are a secondary battery (5), a battery module (4), a battery pack (1), and a power utilization device (6). The secondary battery (5) comprises a shell assembly and an electrode assembly (52); the electrode assembly (52) is arranged in the shell assembly, and the electrode assembly (52) comprises a positive electrode sheet (521), a negative electrode sheet (522), and a separator (523) arranged between the positive electrode sheet (521) and the negative electrode sheet (522); a projection of the negative electrode sheet (522) along a first direction is located within a projection of the positive electrode sheet (521) along the first direction, wherein the first direction is perpendicular to a height direction of the shell assembly. The space occupancy rate of the positive electrode sheet (521) is high, which can sufficiently improve the mass of the positive electrode active material on the positive electrode sheet (521), thereby improving the energy density of the secondary battery (5).
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