Battery Cell Protective Assembly for Impact and Electrolyte Flow
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Solution Overview
Problem
Secondary battery cells are vulnerable to external impacts, which can damage the electrode assembly and lead to short circuits, necessitating a protective structure that maintains electrical connection without interfering with electrolyte injection and simplifies assembly.
Innovation Solution
A battery cell design featuring a protective assembly with an insulating material and a protective frame that includes a through-hole for electrolyte passage, coupled with cap assemblies for secure electrolyte injection and a connection member for simplified electrical connection, reducing the risk of impact damage and enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective assembly is added to protect the electrode assembly from impacts, then the reliability and protection capability are improved, but the device complexity and assembly process difficulty increase
Solution Approach 1:
The protective assembly integrates multiple functions into a single structure: the protective frame provides mechanical protection against impacts, while simultaneously incorporating a through-hole for electrolyte injection and a connection member for electrical connection. This merging of protection, fluid passage, and electrical connection functions into one integrated component reduces overall device complexity while maintaining comprehensive protection capability.
Solution Approach 2:
The protective assembly is designed as a multi-functional component that performs three essential functions: (1) mechanical protection of the electrode assembly from external impacts, (2) providing a passage for electrolyte injection through the through-hole, and (3) establishing electrical connection between the electrode assembly and terminal portion. This multi-functionality eliminates the need for separate protective structures, fluid passages, and connection components, thereby simplifying the overall device structure.
2Reliability
If a protective assembly is added to protect the electrode assembly, then the protection capability is improved, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
By combining the protective frame, through-hole structure, and connection member into a single integrated protective assembly, the manufacturing process is simplified. Instead of assembling multiple separate components (protective structure + fluid passage + connection element), the integrated design allows for fewer assembly steps and reduced manufacturing complexity while maintaining comprehensive protection functionality.
3Ease of manufacture
If the protective assembly structure is simplified to ease assembly, then the ease of manufacture is improved, but the protection capability and reliability may be compromised
Solution Approach 1:
The integration of multiple functions into the protective assembly ensures that simplification of the assembly process does not compromise protection capability. The through-hole is incorporated directly into the protective frame structure, and the connection member is integrated with the protective assembly, ensuring that the protective function remains intact while reducing the number of separate components to be assembled.
4Ease of operation
If the protective assembly includes a through-hole for electrolyte passage, then the electrolyte injection is facilitated, but the structural integrity and protection capability may be reduced
Solution Approach 1:
The through-hole is strategically positioned and sized to provide adequate electrolyte passage while minimizing impact on the overall structural integrity of the protective frame. The local modification (adding a hole) is optimized to maintain sufficient mechanical strength and protection capability in the surrounding areas, ensuring that the protective function is not significantly compromised by the presence of the electrolyte passage.
Data Source
AI summary
A battery cell includes an electrode assembly in which a plurality of electrode plates are stacked; a protective assembly disposed on at least one side of the electrode assembly and including an insulating material; and a case having an internal space in which the electrode assembly is accommodated, wherein the protective assembly includes a through-hole configured to allow electrolyte to pass therethrough.