Roll core, energy storage device and electric equipment

The cylindrical battery design addresses the issue of uneven extreme ear thickness by arranging segmented extreme ears to achieve uniform thickness, reducing welding defects and ensuring successful pressure testing.

CN222673067UActive Publication Date: 2025-03-25XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202420575581.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-22
Publication Date
2025-03-25
Estimated Expiration
2034-03-22

AI Technical Summary

Technical Problem

In cylindrical batteries, the uneven thickness of the extreme ears after flattening poses a risk of welding defects during assembly, particularly due to the absence of extreme ears at the inner circle, leading to potential short circuits and failure in pressure tests.

Method used

The design includes a configuration where the extreme ears are arranged in a manner that their thickness is uniform after flattening, with the inner circle having a greater thickness, utilizing segmented extreme ears and connecting structures to ensure even distribution and support, thereby reducing the risk of welding defects and allowing for successful pressure testing.

Benefits of technology

The solution ensures a uniform thickness of extreme ears after flattening, reducing the risk of welding defects and enabling the batteries to pass pressure tests, thus enhancing the reliability of the cylindrical battery construction.

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Abstract

The utility model discloses a roll core, an energy storage device and electric equipment, the roll core comprises an anode pole piece, a diaphragm and a cathode pole piece which are laminated and wound, a first pole piece body of the anode pole piece comprises a first body section, a second body section and a third body section, a first anode tab and a second anode tab of the anode pole piece are arranged on the second body section and the third body section respectively, a second pole piece body of the cathode pole piece comprises a fourth body section, a fifth body section and a sixth body section, and a first cathode tab and a second cathode tab of the cathode pole piece are arranged on the fifth body section and the sixth body section respectively; the second anode tab is flatly arranged and leans against the first anode tab, and the second cathode tab is flatly arranged and leans against the first cathode tab. According to the roll core, the energy storage device and the electric equipment, the overall thickness of the tabs on the inner ring and the outer ring of the roll core after being flattened is uniform, the thickness of the tabs on the inner ring is large, the risk of weld penetration in the welding process can be reduced, and the yield of a voltage withstanding test is improved.
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