Battery Cover Assembly Segmentation for Welding Deformation Control
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Solution Overview
Problem
The existing lithium ion battery cover assembly faces challenges with deformation during high-temperature welding, affecting sealing efficiency and production yield, leading to increased manufacturing costs and reduced battery safety.
Innovation Solution
A cover assembly comprising a cover plate body with via holes, a cover plate connecting member that minimizes deformation during high-temperature welding, and an electrode terminal connected hermetically with the ceramic sealing member, ensuring stable sealing and reduced material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover plate is welded with the ceramic sealing member at high temperature, then the sealing and insulation performance is improved, but the cover plate becomes soft and deforms, reducing strength and production efficiency
Solution Approach 1:
The patent divides the original single cover plate structure into two separate components: a cover plate and a cover plate connecting member. The cover plate connecting member is specifically designed to be welded with the ceramic sealing member, while the cover plate itself is not exposed to high welding temperatures. This segmentation allows the welding function to be isolated to a dedicated component, preventing thermal deformation of the cover plate while maintaining sealing performance.
Solution Approach 2:
The cover plate connecting member acts as an intermediary component between the cover plate and the ceramic sealing member. It receives the welding heat from the ceramic sealing member connection while transmitting the mechanical connection function to the cover plate. This intermediary structure protects the cover plate from direct exposure to high welding temperatures, preventing softening and deformation.
2Reliability
If the cover plate is welded with the ceramic sealing member at high temperature, then the sealing performance is improved, but the production efficiency decreases due to deformation issues
Solution Approach 1:
By segmenting the cover plate structure into a cover plate and a cover plate connecting member, the patent enables the welding process to be performed on a dedicated component rather than the entire cover plate assembly. This reduces the risk of deformation-related rework and scrap, thereby improving production efficiency while maintaining reliable sealing performance.
3Adaptability or versatility
If various mounting members are formed on the cover plate, then the functional requirements are met, but the cover plate deforms during welding, affecting hermetical connection with the shell
Solution Approach 1:
The patent separates the mounting member formation process from the welding process by using the cover plate connecting member as an intermediate component. The mounting members can be formed on the cover plate without compromising welding precision, as the actual welding occurs on the cover plate connecting member which is designed to withstand thermal processes. This ensures both mounting functionality and hermetical connection precision are achieved.
4Device complexity
If the cover plate is used directly for welding with ceramic sealing member, then the structure is simple, but the high temperature affects the cover plate material causing softening
Solution Approach 1:
The cover plate connecting member serves as a thermal intermediary that absorbs the high welding temperature effects. It is positioned between the heat source (welding process with ceramic sealing member) and the cover plate, protecting the cover plate material from thermal softening while maintaining a relatively simple overall assembly structure.
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 enhances battery yield, improves sealing performance, and reduces manufacturing costs while maintaining the strength and stability of the cover assembly, ensuring better safety and practical application of ceramic sealed batteries.
Implementation Method 1
a cover plate connecting member hermetically connected with the cover plate body at the via hole
Implementation Method 2
an electrode terminal penetrating through the electrode receiving hole to be hermetically connected with and insulated from the cover plate connecting member
Implementation Method 3
a cover assembly according to the first aspect of the present disclosure for sealing the opening end
Data Source
AI summary
A cover assembly and a battery comprising the same are provided. The cover assembly comprises: a cover plate body formed with at least a via hole penetrating therethrough; a cover plate connecting member hermetically connected with the cover plate body at the via hole, which is formed with an electrode receiving hole therein; and an electrode terminal penetrating through the electrode receiving hole to be hermetically connected with and insulated from the cover plate connecting member for leading out a current.