Battery Cell Cover Plate Notches for Anti-Twisting and Gas Venting
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Solution Overview
Problem
Current battery cell top covers lack effective anti-twisting mechanisms and often suffer from gaps formed during injection molding, which compromise the anti-twisting capability and lead to bubble formation affecting the physical properties of the upper plastic part.
Innovation Solution
A cover plate with a raised edge surrounding a through-hole, featuring at least one notch that allows communication between the internal and external spaces, enhancing anti-twisting by clamping the upper plastic part and facilitating gas discharge during injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover plate is added with notches to achieve anti-twisting function, then the anti-twisting capability is improved, but gas bubbles are trapped during injection molding affecting the physical properties of the upper plastic part
Solution Approach 1:
The raised edge is segmented into multiple notches (first notch, second notch, third notch, fourth notch) distributed around the through-hole. This segmentation allows gas to escape through multiple pathways during injection molding, preventing bubble accumulation while maintaining the anti-twisting function through the clamping action of the notched structure.
Solution Approach 2:
The notches act as intermediary channels that facilitate gas escape during injection molding. By providing dedicated gas discharge pathways, the notches mediate between the conflicting requirements of maintaining structural integrity for anti-twisting and allowing gas venting to prevent defects.
2Strength
If the cover plate uses a raised edge with notches for anti-twisting, then the anti-twisting performance is enhanced, but gaps are formed between the cover plate and upper plastic part during injection molding
Solution Approach 1:
The notches are pre-formed in the raised edge structure before injection molding occurs. This preliminary configuration of gas discharge pathways ensures that gas can escape during the molding process, preventing the formation of gaps between the cover plate and upper plastic part while maintaining the anti-twisting function.
3Productivity
If the notches are formed deep in the raised edge to improve gas discharge, then gas discharge efficiency is improved, but the structural strength of the cover plate is reduced
Solution Approach 1:
The notches are positioned at specific locations on the raised edge (first, second, third, and fourth notches at different positions) rather than being uniformly deep throughout. This local quality approach allows gas discharge at critical locations while preserving the overall structural integrity of the cover plate by not compromising the entire raised edge structure.
Solution Approach 2:
Instead of making the entire raised edge structure excessively deep for gas discharge, the invention uses multiple partial notches that provide sufficient gas discharge pathways without removing excessive material. This partial action approach achieves the necessary gas venting while maintaining adequate structural strength.
Data Source
AI summary
Provided are a cover plate, a top cover, a battery cell, and a battery module. The cover plate is used for the battery cell. The cover plate includes: a plate body having a through-hole; and a raised edge disposed on a surface of the plate body and surrounding the through-hole. The raised edge has at least one notch. An internal space defined by the raised edge is in communication with an external space outside the raised edge through the at least one notch.