Battery Cap Sealing Member Using High-Melting Sub-Bodies
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Solution Overview
Problem
Existing sealing rings made of polybutylene terephthalate (PBT) melt during high-power discharge of batteries, causing direct contact between the housing and cap, which leads to a risk of short circuits.
Innovation Solution
A sealing member with a first sub-body made of materials like soluble polytetrafluoroethylene (PFA) or polyphenylene sulfide (PPS) is used, which has a higher melting point than the battery's maximum discharge temperature, ensuring it does not melt or partially melts, maintaining separation between the cap and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the melting point of the sealing member is increased to prevent melting, then safety during high-power discharge is improved, but material selection and manufacturing complexity increase
Solution Approach 1:
The patent divides the sealing member into multiple sub-bodies with different materials, where the first sub-body uses high-temperature resistant material for safety and the second sub-body uses other material for sealing, allowing each part to be optimized independently
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents direct contact between the housing and cap, thereby avoiding short circuits during high-power discharge by using materials with higher melting points than PBT, ensuring safety and reliability.
Implementation Method 1
a melting point of at least part of the first sub-body is higher than a temperature in the space enclosed by the housing when the battery is in the state of maximum discharge
Data Source
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AI summary
A sealing member, a cap of a battery and a battery are provided by the present disclosure. The sealing member is configured to insulate a cap from a housing of a battery and seal a gap between the cap and the housing. The sealing member comprises a body. The body comprises a first sub-body located between the housing and the cap. The melting point of at least part of the first sub-body is higher than the temperature in the space enclosed by the housing when the battery is in the state of maximum discharge.