Battery Cover Plate Groove for Pressure Relief and Tab Disconnection
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Solution Overview
Problem
Current methods for preventing battery explosions in lithium-ion batteries, such as explosion-proof valves and mechanical pressure relief grooves, fail to effectively inhibit continuous heat generation after pressure relief, compromising safety performance.
Innovation Solution
A battery cover plate design featuring an explosion-proof groove that surrounds or is partially around the electrode terminal, allowing the cover plate to burst and disconnect the electrical connection between the electrode terminal and the battery cell, thereby preventing continuous heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an explosion-proof valve is installed on the battery cover plate, then the battery can relieve pressure when internal pressure increases, but the process becomes complex and cost increases
Solution Approach 1:
The patent extracts the explosion-proof function from a separate valve component and integrates it directly into the battery cover plate by forming an explosion-proof groove during the cover plate manufacturing process. This eliminates the need for additional explosion-proof valve components and simplifies the overall structure while maintaining pressure relief capability.
Solution Approach 2:
The patent combines the explosion-proof function with the battery cover plate structure by integrating the explosion-proof groove into the cover plate design. This merging of functions reduces the number of components and simplifies the overall battery structure while achieving both sealing and pressure relief purposes.
2Reliability
If a groove is set on the battery casing to guide breaking, then pressure relief is achieved, but electrical connection remains intact and heat generation continues
Solution Approach 1:
The patent combines multiple functions into the explosion-proof groove: pressure relief, electrical connection interruption, and heat generation prevention. By positioning the groove to surround the electrode terminal, a single structural feature achieves three protective functions simultaneously, eliminating the need for separate components.
Solution Approach 2:
The explosion-proof groove serves multiple functions: it acts as a pressure relief path, an electrical isolation barrier, and a heat generation prevention mechanism. This multi-functional design eliminates the need for separate components for each protective function, simplifying the overall structure.
3Object-affected harmful factors
If the explosion-proof groove surrounds the electrode terminal, then electrical connection is interrupted to prevent heat generation, but the groove depth must be precisely controlled
Solution Approach 1:
The patent specifies a groove depth range of 5%-95% of the battery cover plate thickness, with optimized ranges of 30-90% or 50%-85%. This parameter specification provides manufacturing flexibility while ensuring the groove is deep enough to interrupt electrical connection and prevent heat generation, but not so deep as to compromise cover plate strength.
Data Source
AI summary
A battery cover plate and a lithium-ion secondary battery. An electrode terminal is provided on the battery cover plate, an explosion-proof groove is also provided on the battery cover plate, and the explosion-proof groove surrounds or is set partially around the electrode terminal. The battery cover plate can burst or explode along the explosion-proof groove in the case of battery abnormality, and the battery cover plate can drive the electrode terminal to move together when the battery cover plate bursts or explodes, and the movement of the electrode terminal pulls a tab, so that the tab or the junction of the tab can be partially broken or completely broken, thereby weakening or cutting off the electric connection between the electrode terminal and a battery cell.