lithium battery

By setting recessed grooves and multiple explosion-proof pressure relief structures in the lithium battery roll core, the problem of low space utilization caused by interference between the cover group and the electrode group is solved, and high energy density and safety are achieved.

CN115763943BActive Publication Date: 2025-09-30EVE ENERGY CO LTD
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Patent Information

Application Number
CN202211457925.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-21
Publication Date
2025-09-30
Estimated Expiration
2042-11-21

AI Technical Summary

Technical Problem

In existing lithium battery designs, interference between the cap group and the electrode group results in low space utilization of the accommodating cavity, which cannot meet the energy density requirements of miniaturized devices.

Method used

An irregularly shaped recessed groove is provided near the opening end of the lithium battery's coil core to avoid the extension of the cover plate, insulating seal and pole. Combined with a multi-pass explosion-proof pressure relief structure and an insulating layer design, the space inside the cavity is fully utilized.

Benefits of technology

The energy density and safety of lithium batteries are improved to meet the energy needs of miniaturized equipment, while also enhancing insulation and explosion-proof performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention belongs to the field of battery technology and discloses a lithium battery comprising a shell, a pole group and a cover group. The shell is provided with a receiving cavity with an opening at the top; the pole group is provided in the receiving cavity, the pole group comprises a winding core, and an irregularly shaped recessed groove is provided at one end of the winding core close to the opening; the cover group comprises a cover plate, an insulating seal and a pole, the pole and the insulating seal are both mounted on the cover plate, the cover plate is provided on the shell and closes the opening, and the irregularly shaped recessed groove can avoid the portion of the cover plate and / or the insulating seal and / or the pole extending toward the pole group. In the lithium battery, the winding core is provided with a recessed groove according to the structural dimensions of the cover plate, the insulating seal and the extended portion of the pole, so that the recessed groove can avoid the extended portion of the cover group, while the rest of the winding core makes full use of the space in the receiving cavity, effectively improving the energy density of the lithium battery.
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Citation Information

Patent Citations

  • Battery cell of energy storage device and energy storage device

    CN214313441U

  • Steel shell button cell structure with special-shaped pole pieces

    CN217158232U