Battery End Cap Venting Layout to Prevent False Valve Triggering
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Solution Overview
Problem
Energy-storage apparatuses face safety hazards due to excessive internal pressure caused by gas bubbles, leading to potential explosions and reduced service life.
Innovation Solution
An end cover assembly with an explosion-proof valve that releases excess gas to prevent explosions and includes a current collector plate design to avoid false triggering, ensuring reliable operation and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an explosion-proof valve is added to release excess gas, then safety is improved, but device complexity increases
Solution Approach 1:
The end cap assembly is segmented into functional components: the cover body with explosion-proof hole, the explosion-proof valve for pressure relief, and the current collector plate with welding groove. This segmentation allows each component to perform its specific function independently, improving safety while maintaining manageable complexity through modular design
Solution Approach 2:
The cover body serves multiple functions: it provides structural closure, contains the explosion-proof hole for pressure relief, and supports the explosion-proof valve. This multi-functionality reduces the need for additional separate components, thereby improving safety without proportionally increasing device complexity
2Reliability
If the explosion-proof valve is positioned to face the welding groove, then false triggering is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The current collector plate has non-uniform structure with a boss portion and welding groove at specific locations. The explosion-proof valve is positioned to face the welding groove area, creating local optimization where the valve is protected from electrolyte impact while maintaining its pressure relief function. This local quality approach prevents false triggering without requiring high overall manufacturing precision
Solution Approach 2:
The boss portion and welding groove are pre-positioned on the current collector plate during manufacturing, establishing the protective geometry before assembly. This preliminary action ensures that when the explosion-proof valve is installed, it is automatically positioned to face the welding groove, reducing false triggering risk without requiring high precision during final assembly
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The explosion-proof valve effectively discharges excess gas, preventing explosions and enhancing the safety and reliability of energy-storage apparatuses by ensuring proper valve function and reducing false triggers.
Implementation Method 1
When the internal gas pressure of the energy-storage apparatus is too high, the explosion-proof valve will rupture under the gas pressure, allowing the gas inside the energy-storage apparatus to be promptly discharged
Data Source
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Figure 3
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AI summary
An end cover assembly, an energy-storage apparatus, and an electricity-consumption device are provided in the disclosure, which can avoid safety hazards caused by excessive internal gas pressure in the energy-storage apparatus, thereby helping to improve the service life of the energy-storage apparatus. The end cover assembly includes a current collector plate, a cover body, and an explosion-proof valve. The cover body defines a mounting hole and an explosion-proof hole, the mounting hole and the explosion-proof hole both extend through the cover body in a thickness direction of the cover body, and the mounting hole and the explosion-proof hole are spaced apart from each other. The explosion-proof valve is mounted on the cover body and covers the explosion-proof hole. The current collector plate includes a main body portion and a boss portion. The main body portion is located at one side of the cover body in the thickness direction of the cover body, and the main body portion defines a welding groove. At least a portion of the welding groove is disposed opposite to the explosion-proof valve in a thickness direction of the end cover assembly. The boss portion is disposed on the surface of the main body portion facing towards the cover body and penetrates through the mounting hole, and the boss portion is provided with an identification mark. When viewed from a thickness direction of the current collector plate, a projection of a straight line passing through a center of the identification mark and parallel to a length direction of the welding groove intersects with the welding groove.