Secondary battery

By configuring a resin liner and protrusion at the filling port of the secondary battery, and setting a limiting component on the cap or sealing component, the problem of reduced airtightness around the filling port is solved, and higher sealing performance is achieved.

CN115986340BActive Publication Date: 2026-06-16PRIME PLANET ENERGY & SOLUTIONS INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PRIME PLANET ENERGY & SOLUTIONS INC
Filing Date
2022-10-12
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

The airtightness around the liquid injection port of existing secondary batteries is easily reduced, resulting in insufficient sealing.

Method used

By placing a resin liner between the flange of the sealing component and the outer surface of the cap, and providing a protrusion at the radial center of the flange, the protrusion penetrates the resin liner to provide greater compression force. At the same time, a limiting component is provided on the cap or sealing component to prevent the resin liner from expanding outward, thus ensuring the airtightness of the injection port.

Benefits of technology

It effectively suppressed the decrease in airtightness of the injection port and improved the sealing performance of the secondary battery.

✦ Generated by Eureka AI based on patent content.

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    Figure CN115986340B_ABST
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Abstract

The present invention relates to a secondary battery that suppresses a decrease in the air tightness at the periphery of a filling port provided in a lid of the secondary battery. The secondary battery disclosed herein has an electrode body, a case main body, and a lid of the case main body. The lid (14) has a filling port (15), a flat annular resin gasket (60) mounted to the filling port (15), and a stopper member (50). The stopper member (50) has a sleeve (51) inserted into the filling port (15) and a flange (52) extending from the sleeve (51) toward the outer diameter direction along the outer surface (14a) of the lid (14). The resin gasket (60) is mounted to the filling port (15) and is sandwiched between the flange (52) and the outer surface of the lid. Here, a protrusion (52x) that protrudes toward the outer surface of the lid is provided at the radial middle portion of the flange (52). A restriction portion that restricts the outer edge of the resin gasket (60) is provided in the lid or the stopper member.
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Citation Information

Patent Citations

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  • Sealing plug and secondary battery, and method of manufacturing secondary battery

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