Battery Cell End-Cap Isolation Structure Against Tab Short Circuits
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Solution Overview
Problem
The reliability of battery cells is compromised due to the risk of tab insertion and short circuits during impacts, and the deformation of the separation member's opening structure under external forces, which affects the structural integrity and performance.
Innovation Solution
A battery cell design featuring a separation member with an opening structure snap-fitted to a protruding structure on the end cover assembly, reinforced by a structure connected to its outer side wall, dispersing forces and reducing deformation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the separation member is designed with an opening structure to connect the tab to the end cover assembly, then the tab connection is facilitated, but the opening structure is prone to deformation under external forces
Solution Approach 1:
The separation member is divided into multiple functional parts: a separation plate for isolation, an opening structure for connection, and a reinforcing structure for support. This segmentation allows each part to perform its specific function optimally while working together to solve the contradiction between ease of tab connection and structural stability.
Solution Approach 2:
The reinforcing structure extends in a direction perpendicular to the main plane of the separation plate, adding a third dimension to the design. This dimensional extension provides additional structural support to the opening structure without interfering with its primary function of connecting the tab to the end cover assembly.
2Reliability
If the separation member is positioned between the tab and main body part to prevent short circuits, then reliability is improved, but the separation member may move during battery cell operation
Solution Approach 1:
The opening structure of the separation member is merged with the protruding structure of the end cover assembly through a snap-fit connection. This combination ensures that the separation member remains firmly positioned between the tab and main body part, preventing both short circuits and unwanted movement during battery cell operation.
Solution Approach 2:
The separation member acts as an intermediary component between the tab and the main body part of the electrode assembly. By positioning itself in this intermediate location and securing it with the snap-fit connection to the end cover assembly, it effectively prevents direct contact between positive and negative tabs while remaining stable in place.
3Ease of manufacture
If the opening structure is made larger to facilitate tab insertion, then ease of assembly is improved, but the structural strength of the opening structure decreases
Solution Approach 1:
The reinforcing structure adds support in a direction perpendicular to the opening structure's plane, providing structural strength without restricting the opening's dimensions in its primary plane. This allows the opening to remain large enough for easy tab insertion while the reinforcing structure prevents deformation under load.
Data Source
AI summary
A battery cell, a battery and an electrical apparatus. The battery cell comprises a casing, having a first opening; a first end cap assembly, used for covering the first opening, the first end cap assembly comprising protruding structures and a first electrode lead-out component; an electrode assembly, accommodated in the casing, the electrode assembly comprising a main body part and tabs extending from the main body part; and an isolation component, at least partially provided between the first electrode lead-out component and the main body part, wherein the isolation component comprises opening structures, reinforcement structures and isolation plates, the opening structures are protrudingly arranged on the surfaces of the isolation plates facing the first end cap assembly and are snap-fitted with the protruding structures, and the reinforcement structures are connected to the outer side walls of the opening structures.