Secondary battery and electric device

By setting filler to support the electrode assembly at the step of the secondary battery casing, the problem of lack of support in the step area of ​​irregularly shaped secondary battery casings is solved, improving interface yield and energy density, and reducing the risk of lithium plating.

WO2026117933A1 Publication Date: 2026-06-11NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Application Number
PCT/CN2024/136458
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-03
Publication Date
2026-06-11

AI Technical Summary

Technical Problem

The lack of support in the stepped areas at different depths of the casing of irregularly shaped secondary batteries leads to insufficient pressure on the electrodes during the formation process, resulting in low interface yield and high risk of lithium plating.

Method used

Design a secondary battery structure in which the second, third and fourth walls of the casing form a stepped structure, the positive and negative electrode plates of the electrode assembly are alternately stacked, and a first filler is used to provide support at the steps of the casing to improve the pressure resistance of the electrode assembly and enhance the adhesion between the positive electrode plate and the separator, and between the negative electrode plate and the separator.

Benefits of technology

It improves the interface yield of electrode components after formation, reduces the possibility of lithium plating in secondary batteries during long cycles, makes full use of the internal space of the casing, and improves energy density.

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Abstract

A secondary battery (100) and an electric device. The secondary battery (100) comprises a casing (10), an electrode assembly (20), and a first filler (30). The casing (10) comprises a first wall (11), a second wall (12), a third wall (13), a fourth wall (14), and a surrounding wall (15), and encloses a first space; in a first direction (X), the distance between the first wall (11) and the second wall (12) is less than the distance between the first wall (11) and the third wall (13). The electrode assembly (20) is accommodated in the first space; the electrode assembly (20) comprises a first portion (201) and a second portion (202), wherein the second portion (202) is located on the side of the first portion (201) facing the third wall (13), the projection of the second portion (202) in the first direction (X) being located within the range of the third wall (13); the second portion (202) is separated from the fourth wall (14), and a first gap is formed between the first portion (201) and the fourth wall (14). The first filler (30) is arranged in the first gap; in the first direction (X), the first filler (30) is located between the first portion (201) and the third wall (13), and in a second direction (Y), the first filler (30) is located between the fourth wall (14) and the second portion (202). In the secondary battery (100), the provision of the first filler (30) can reduce the possibility of lithium plating occurring in the secondary battery (100).
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