Secondary battery

By introducing vent member and vent reservoir into the inclined sealing portion of secondary battery, the problem of difficult gas emissions during hot runaway is solved, safer and more effective gas guidance is achieved, and battery damage is reduced.

JP7653457B2Active Publication Date: 2025-03-28LG ENERGY SOLUTION LTD
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Patent Information

Application Number
JP2022575258
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-12-29
Filing Date
2022-04-15
Publication Date
2025-03-28
Estimated Expiration
2042-04-15

AI Technical Summary

Technical Problem

The existing secondary battery is difficult to effectively direct gas emissions in the case of thermal runaway, resulting in electrode damage and fire expansion.

Method used

A secondary battery is designed that contains an vent member, using an vent reservoir, whose melting point is lower than a sealant reservoir, and the vent member is located in an inclined sealing portion to guide gas emissions more efficiently when the runaway is hot.

Benefits of technology

By directing gas emissions to specific directions, direct contact between gas and electronede lead is reduced, the safety of the battery is improved, and damage caused by thermal runaway is reduced.

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Abstract

The present invention relates to a secondary battery including a vent member. The secondary battery may include an electrode assembly, a case including a housing for housing the electrode assembly therein, an electrode lead attached to the electrode assembly, and a vent member. The case may include a sealing portion for sealing the electrode assembly therein. The sealing portion may include a sealant resin for sealing the periphery of the electrode assembly. The electrode lead may extend from the case along a first direction. The sealing portion may include an inclined sealing portion adjacent to the electrode lead. The inclined sealing portion may extend along a second direction. The second direction is not perpendicular to the first direction. The vent member may be located in the inclined sealing portion. The vent member may include a vent resin having a lower melting point than the sealant resin.
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