Battery Vent Patch Structure for Protected Pressure Release
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Solution Overview
Problem
Existing explosion-proof membranes in batteries are prone to damage due to prolonged exposure, compromising their effectiveness and safety.
Innovation Solution
A battery design incorporating a cover plate with an explosion-proof valve shielded by a protective patch, featuring a notch that allows communication with the outside under predetermined pressure, with specific ratios and tensile strength properties to ensure reliable sealing and airtightness testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the explosion-proof valve is exposed to achieve pressure release function, then the pressure relief capability is improved, but the valve becomes vulnerable to damage from foreign objects and prolonged exposure
Solution Approach 1:
The patent introduces a protective patch as an intermediary component between the external environment and the explosion-proof valve. This patch allows pressure to pass through (enabling pressure relief) while blocking foreign objects (protecting the valve). The protective patch acts as a mediator that selectively permits pressure transmission while preventing direct contact between contaminants and the valve, thus resolving the contradiction between exposure for pressure release and protection against damage.
Solution Approach 2:
The protective patch is implemented as a thin film structure that can deform under pressure. This flexible film allows pressure to push it away from the valve opening, enabling pressure relief, while in normal conditions it maintains a protective barrier against foreign objects. The flexible nature of the thin film resolves the contradiction by allowing it to adapt its state between protection and pressure release modes.
2Reliability
If the explosion-proof valve is completely sealed to protect against foreign objects, then the protection capability is improved, but pressure release function is compromised
Solution Approach 1:
The protective patch is designed to be dynamic rather than static. Under normal conditions, it maintains a sealed position to protect the valve. When pressure builds up, the patch dynamically changes its state by being pushed away from the valve opening, allowing pressure release. This dynamic behavior resolves the contradiction by making the protection level adaptive to the operational conditions.
Solution Approach 2:
The protective patch operates in periodic cycles: sealed state for protection, then opens for pressure release, then returns to sealed state. This periodic action between sealed and open states allows the system to alternate between protection mode and pressure relief mode, resolving the contradiction between maintaining constant protection and enabling pressure release when needed.
3Reliability
If a protective patch is added to shield the explosion-proof valve, then the valve protection is improved, but the device complexity increases
Solution Approach 1:
The protective patch is implemented as a simple thin film rather than a complex mechanical structure. This thin film approach provides effective protection while adding minimal structural complexity. The simplicity of the thin film solution resolves the contradiction by delivering substantial protection benefits with minimal increase in device complexity.
Solution Approach 2:
The protective patch is designed as a simple, potentially disposable component that can be easily replaced if needed. This approach allows for effective protection without investing in complex, expensive, or permanent structural modifications. The use of a simple patch resolves the contradiction by providing adequate protection with minimal structural complexity and cost.
Data Source
AI summary
A battery and a battery apparatus are provided. The battery pack includes a cover plate, an explosion-proof valve, and a protective patch. The explosion-proof valve is arranged on the cover plate. The protective patch is arranged on an outer side of the cover plate. A sealed chamber is formed between the explosion-proof valve and the protective patch, and a notch penetrating through the protective patch is arranged on the protective patch in a thickness direction, such that when a predetermined pressure is applied, the sealed chamber communicates with an outside through the notch. The notch has a total length of a and the protective patch has a thickness of b, where 5≤a/b≤100 and 0.01 mm≤b≤1.2 mm, and the protective patch has a tensile strength of c, where c/b=xb−1.073.