Battery Cell Cover Assembly for Stable Gas Venting Under Pressure
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Solution Overview
Problem
The safety of battery cells is constrained by gas discharge, which can lead to deformation and aging of the air-permeable member, potentially causing safety hazards due to uncontrolled gas pressure and lithium precipitation.
Innovation Solution
A battery cell design featuring a housing with a recessed fastener and an air-permeable member, where a protruding portion supports the air-permeable member to limit deformation and facilitate controlled gas discharge through recesses and accommodating cavities, ensuring safe gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas discharge is enabled through the air-permeable member, then safety is improved, but deformation and aging of the air-permeable member occurs
Solution Approach 1:
The patent introduces a protruding portion with a specific local structure that provides support only at the critical area where the air-permeable member is most susceptible to deformation. This localized structural modification allows the air-permeable member to maintain its functional properties for gas discharge while preventing excessive deformation and aging in the supported region.
Solution Approach 2:
The protruding portion acts as a pre-positioned support structure that cushions and limits the deformation of the air-permeable member before excessive aging can occur. By providing this protective support in advance, the system maintains safety functionality while extending the service life of the air-permeable member.
2Stability of the object's composition
If the air-permeable member is made more robust to prevent deformation, then stability is improved, but gas discharge capability may be reduced
Solution Approach 1:
Instead of making the entire air-permeable member more robust, the patent applies structural support only at the specific location of the protruding portion. This localized approach maintains the air-permeable member's overall flexibility and gas discharge capability while providing sufficient stability at the critical support point to prevent excessive deformation.
3Reliability
If the recess is made deeper to improve gas discharge, then safety is improved, but the air-permeable member deforms more
Solution Approach 1:
The protruding portion provides pre-positioned support that cushions the air-permeable member against deformation caused by deeper recesses. This allows the recess to be designed with greater depth for improved gas discharge efficiency while the protruding portion prevents excessive deformation by providing structural support at the critical location.
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
The design reduces air-permeable member deformation, slows down aging, and enhances safety performance by maintaining controlled gas discharge, thereby improving the stability and service life of the battery cell.
Implementation Method 1
when a gas pressure inside the housing reaches a threshold
Implementation Method 2
The air-permeable member covers the recess and is configured to allow gas to be discharged
Implementation Method 3
the protruding portion is attached to the air-permeable member, so as to limit deformation of the air-permeable member in a thickness direction of the wall portion
Implementation Method 4
limit deformation of the air-permeable member
Data Source
AI summary
A battery cell, a cover assembly, a battery, an electric apparatus, a method, and a device are provided. The battery cell includes an electrode assembly and a housing to accommodate the electrode assembly. A wall portion of the housing includes a body portion and a fastener, the fastener is provided with a recess communicating with the outside, and the recess is arranged on an inner surface of the fastener facing the electrode assembly and recessed in a direction leaving the electrode assembly. An air-permeable member covers the recess, and the air-permeable member is configured to allow gas to be discharged to the outside of the housing through the recess when a gas pressure inside the housing reaches a threshold. A bottom wall of the recess is provided with a protruding portion extending toward the electrode assembly, and the protruding portion is configured to be attached to the air-permeable member.