Battery Cell Terminal Insulation Structure Against Cracking
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Solution Overview
Problem
Battery cells face reliability issues due to deformation and cracking of insulating members caused by electrode terminals, leading to potential insulation failure and reduced performance.
Innovation Solution
A protective member with higher tensile strength than the insulating member is positioned around the electrode terminal to limit its deformation and movement, reducing the risk of cracking and improving the battery cell's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating member is placed between the electrode terminal and the wall portion to provide insulation, then the insulation performance is improved, but the insulating member is prone to deformation and cracking under the action force of the electrode terminal
Solution Approach 1:
The protective member is introduced as an intermediary component between the electrode terminal and the insulating member. This protective member has higher tensile strength than the insulating member and is configured to limit the deformation and movement of the electrode terminal, thereby protecting the insulating member from cracking while maintaining insulation performance.
Solution Approach 2:
The battery cell employs a composite structure combining the protective member and the insulating member. The protective member is made of material with higher tensile strength than the insulating member, creating a layered composite system where each layer performs its specific function - the protective member handles mechanical stress while the insulating member provides electrical insulation.
2Ease of manufacture
If the electrode terminal is allowed to move freely during production and use, then the ease of assembly is improved, but the deformation and movement of the electrode terminal cause cracking of the insulating member
Solution Approach 1:
The protective member is pre-installed around the electrode terminal before the insulating member is placed. This preliminary action of constraining the electrode terminal with the protective member prevents excessive deformation and movement during subsequent assembly and use, thereby protecting the insulating member from cracking.
Solution Approach 2:
The protective member serves as a cushioning element that absorbs and distributes the mechanical stress and movement forces of the electrode terminal before these forces can reach the insulating member. This beforehand cushioning prevents the insulating member from experiencing harmful deformation and cracking.
3Reliability
If the tensile strength of the protective member is increased to prevent cracking, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The protective member is designed to perform multiple functions simultaneously: it limits the deformation and movement of the electrode terminal, protects the insulating member from cracking, and maintains the structural integrity of the battery cell. This multi-functionality reduces the need for additional separate components, thereby minimizing device complexity while improving reliability.
Data Source
AI summary
A battery cell comprises an electrode assembly, a shell, an electrode terminal, an insulating member, and a protective member. The shell comprises a wall portion provided with an electrode lead-out hole. The electrode assembly is accommodated in the shell and comprises a tab. The electrode terminal is electrically connected to the tab. The electrode terminal comprises a terminal body passing through the electrode lead-out hole and a fixing portion connected to the terminal body. The insulating member is arranged surrounding the terminal body. At least a portion of the insulating member is located between the fixing portion and the wall portion to isolate, in an insulated manner, the fixing portion from the wall portion. The protective member is arranged surrounding the terminal body and in contact with the insulating member.