Battery Cell Degassing Vent Structure Against Impurity Clogging
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Solution Overview
Problem
Existing degassing apparatuses in battery cells are prone to corrosion and clogging due to external impurities, which can lead to safety issues such as fire and explosion, as these impurities accumulate on the breathable members and disrupt the normal degassing process.
Innovation Solution
A degassing apparatus with a staggered projection design for its through-holes and breathable member, which reduces the likelihood of external impurities directly contacting the breathable member, and includes a gas channel and reinforcing member to enhance stability and prevent contamination, thereby improving the safety and structural compactness of the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breathable member is used for gas discharge, then degassing function is improved, but the breathable member is prone to corrosion and clogging by external impurities
Solution Approach 1:
A protection member is introduced as an intermediary component between the external environment and the breathable member. This protection member includes a through-hole that allows gas to pass through while blocking external impurities from directly contacting the breathable member, thus resolving the contradiction between maintaining degassing reliability and preventing impurity contamination
Solution Approach 2:
The patent introduces a spatial dimension solution by staggering the projection of the through-hole in the protection member with the projection of the breathable member in the axial direction. This dimensional offset creates a protective configuration where gas can pass through both components while impurities are prevented from directly reaching the breathable member
2Productivity
If the projection of the through-hole and the projection of the breathable member are aligned, then gas discharge efficiency is improved, but external impurities can directly contact and damage the breathable member
Solution Approach 1:
The patent resolves this contradiction by introducing a dimensional offset in the axial direction between the through-hole projection and breathable member projection. This staggered arrangement allows gas to efficiently pass through both components while creating a spatial barrier that prevents impurities from directly contacting the breathable member, thus maintaining productivity while reducing harmful factors
3Reliability
If a protection member is added to protect the breathable member, then safety is improved, but device complexity increases
Solution Approach 1:
The protection member serves as a simple intermediary component that adds minimal structural complexity while significantly improving safety. By positioning this single component with a through-hole in front of the breathable member, the patent achieves effective protection against impurities without requiring complex multi-component systems or complex control mechanisms
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 solution effectively reduces the risk of impurity-induced damage to the breathable member, ensuring reliable gas discharge and enhancing the safety and operational integrity of the battery cell by minimizing contamination and clogging, thus preventing potential fires and explosions.
Implementation Method 1
The breathable member is configured for gas to pass through when pressure of the gas in the battery cell reaches a first threshold
Data Source
AI summary
This application provides a degassing apparatus, a battery cell, a battery, and an electric apparatus. The degassing apparatus includes a degassing body, a breathable member, and a protection member. The breathable member and the protection member are disposed at the degassing body, and the protection member is disposed on a side of the breathable member back away from an electrode assembly of the battery cell. The protection member is provided with a through-hole, and a gas channel in communication with the first through-hole is formed between the breathable member and the protection member. The breathable member is configured for gas to pass through when pressure in the battery cell reaches a first threshold, such that the gas passes through the gas channel and the first through-hole to be discharged outside the battery cell.