Battery Cell Venting Structure for Leak-Resistant Gas Discharge
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Solution Overview
Problem
Battery cells face issues with seal failure and electrolyte leakage due to failures at the composite interface of gas-permeable assemblies, affecting their reliability.
Innovation Solution
A battery cell design incorporating a housing with an accommodating groove and a gas-permeable assembly supported by a support member, which includes a fixing member and a gas-permeable film, with a second through hole for gas discharge and a connecting portion to prevent excessive gas accumulation and electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a gas-permeable assembly is installed in the housing to discharge gas, then gas accumulation is prevented and thermal runaway is avoided, but the composite interface becomes prone to seal failure and electrolyte leakage
Solution Approach 1:
The support member acts as an intermediary component between the accommodating groove and the gas-permeable film. It provides mechanical support to the composite interface, distributing stress and preventing seal failure. The support member reinforces the connection between the fixing member and the gas-permeable film, thereby maintaining reliability while preserving the gas discharge function.
Solution Approach 2:
The gas-permeable assembly utilizes composite material structure combining the fixing member (rigid component), the gas-permeable film (flexible component), and the support member (reinforcing component). This composite structure integrates different material properties to simultaneously achieve gas permeability, mechanical strength, and sealing reliability, preventing both thermal runaway and electrolyte leakage.
2Ease of operation
If the gas-permeable film covers the second through hole to discharge gas, then gas can escape from the battery cell, but the connecting portion is vulnerable to delamination and seal failure
Solution Approach 1:
The support member is pre-installed at the composite interface before the gas-permeable assembly is fully assembled. It provides beforehand cushioning and reinforcement to the connecting portion, preventing delamination and seal failure under subsequent operational stresses. This prior protective measure ensures the stability of the composite interface while maintaining the gas discharge function.
3Device complexity
If the fixing member is connected directly to the wall portion without additional support, then the structure is simple, but the composite interface is prone to failure under stress
Solution Approach 1:
The support member serves as an intermediary reinforcement element between the fixing member and the accommodating groove. It adds minimal structural complexity while significantly improving the reliability of the composite interface by distributing mechanical stresses and preventing connection failure under operational conditions.
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 the probability of seal failure and electrolyte leakage by providing support to the composite interface, enhancing the reliability of the battery cell.
Implementation Method 1
the gas-permeable film includes a covering portion and a connecting portion disposed around the covering portion, the covering portion covers the second through hole along the first direction and is configured to discharge gas inside the battery cell
Implementation Method 2
The support member is configured to provide support to the connecting portion, reducing the risk of failure at the composite interface between the connecting portion and the fixing member
Implementation Method 3
The connecting portion is connected to the fixing member, and the gas-permeable film prevents electrolyte inside the battery cell from flowing to the outside of the battery cell
Data Source
AI summary
Battery cell includes housing including wall portion with accommodating groove provided at outer surface thereof and extending along first direction. Bottom wall of the accommodating groove has first through hole. The battery cell further includes gas-permeable assembly at least partially disposed in the accommodating groove and spaced apart from the bottom wall of the accommodating groove, and including fixing member connected to the wall portion and provided with second through hole extending along the first direction, and gas-permeable film including covering portion and connecting portion disposed around the covering portion. The covering portion covers the second through hole along the first direction and is configured to discharge gas inside the battery cell. The connecting portion is connected to the fixing member. The battery cell also includes support member, at least partially clamped between the bottom wall of the accommodating groove and the connecting portion.