Battery Terminal Insulation Structure for Electrolyte Drainage
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Solution Overview
Problem
Existing secondary batteries face issues with electrolyte accumulation and corrosion due to deformation of the inner plastic during assembly, leading to concentrated liquid-phase corrosion of the housing.
Innovation Solution
The secondary battery design includes a housing with an inner plastic featuring through channels and reinforcing ribs, which allow for timely discharge of electrolyte, preventing accumulation and corrosion by compressing the inner plastic and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner plastic is compressed between the electrode terminal and housing during assembly, then the inner plastic provides effective insulation and prevents electrode movement, but electrolyte accumulates between the inner plastic and housing causing concentrated corrosion
Solution Approach 1:
The inner plastic is designed with through channels forming a porous structure, allowing electrolyte to pass through rather than accumulate. This porous design maintains the insulation function while eliminating the harmful electrolyte accumulation that causes concentrated corrosion of the housing.
Solution Approach 2:
The inner plastic is segmented with multiple through channels distributed across its surface, dividing the potential electrolyte accumulation zones into multiple drainage paths. This segmentation ensures comprehensive electrolyte discharge across the entire contact area between inner plastic and housing.
2Object-affected harmful factors
If through channels are added to the inner plastic, then electrolyte accumulation is prevented, but the structural strength of the inner plastic may be reduced
Solution Approach 1:
The through channels are strategically positioned in specific local regions of the inner plastic where they provide maximum electrolyte discharge benefit while minimizing impact on overall structural strength. The distribution and sizing of channels are optimized to maintain mechanical integrity in critical load-bearing areas.
Solution Approach 2:
The inner plastic is designed as a composite structure combining solid material with integrated through channels, creating a composite functional element that simultaneously provides mechanical support, insulation, and electrolyte drainage capabilities.
3Ease of operation
If the inner plastic is deformed during assembly compression, then proper positioning and contact are achieved, but deformation creates recessed portions that trap electrolyte
Solution Approach 1:
The through channels are pre-formed in the inner plastic before assembly, anticipating the deformation that will occur during compression. This preliminary action ensures that even when the inner plastic deforms to achieve proper positioning, the through channels remain open and functional, preventing electrolyte trapping in any resulting recessed portions.
Data Source
AI summary
A secondary battery includes a housing including an end wall having a first assembly hole and a side wall surrounding the end wall; inner plastic contacting surface of the end wall facing an inner portion of the housing and having a second assembly hole corresponding to the first assembly hole; and a electrode terminal including a post portion and an inner flange. The post portion passes through the first assembly hole and the second assembly hole. The inner flange is connected to one end of the post portion located inside the housing and clamps the inner plastic together with the end wall. In a thickness direction of the inner plastic, the inner plastic is provided with a through channel passing through the inner plastic itself. The disclosure aims to provide a secondary battery, a battery pack, and an electronic apparatus to at least improve the safety of the secondary battery.