Electrode Terminal Buffering Structure for Lithium Ion Battery Sealing
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Solution Overview
Problem
The existing sealing methods for lithium ion batteries, particularly using ceramic sealing members between the cover plate and electrode terminal, are prone to cracking and breaking due to material differences and stress during welding, leading to reduced reliability and stability, increased manufacturing difficulty, and decreased battery yield.
Innovation Solution
The introduction of an electrode terminal with a buffering structure and a cover assembly that includes an insulation sealing member sandwiched between the cover plate and the electrode terminal, which reduces stress during welding and protects the ceramic sealing member, enhancing the battery's reliability and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic sealing member is used for insulating and sealing between the cover plate and the electrode terminal, then the insulation and sealing performance is improved, but the ceramic sealing member is prone to breaking or cracking due to large stress during welding
Solution Approach 1:
A buffering structure is introduced as an intermediary component between the electrode terminal and the ceramic sealing member. This buffering structure absorbs and distributes the welding stress, preventing direct transmission of stress to the ceramic sealing member, thereby avoiding cracking while maintaining the sealing function.
Solution Approach 2:
The buffering structure is designed in advance to cushion and absorb the stress that will occur during the welding process. By preparing this stress-absorbing element beforehand, the ceramic sealing member is protected from the harmful effects of welding stress before the stress can cause cracking.
2Reliability
If a ceramic sealing member is used for insulating and sealing, then the insulation performance is improved, but the manufacturing difficulty increases and battery yield decreases
Solution Approach 1:
The buffering structure serves as a mediator that simplifies the manufacturing process by decoupling the welding operation from the ceramic sealing member. This allows the ceramic component to be installed without direct welding stress, reducing manufacturing complexity and improving yield.
Data Source
AI summary
An electrode terminal, a cover assembly and a battery comprising the cover assembly are provided. The electrode terminal comprises: a terminal pole portion, and a pole cap portion formed on an end of the terminal pole portion, and a buffering structure disposed on a surface of the pole cap portion facing to the terminal pole portion.