Battery Vent Patch Structure for Protected Pressure Relief
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Solution Overview
Problem
Existing battery designs with explosion-proof valves face damage issues due to prolonged exposure and lack effective protection against pressure and foreign objects, affecting safety and airtightness testing.
Innovation Solution
A battery design incorporating a cover plate with an explosion-proof hole, an explosion-proof valve, and a protective patch with a notch that forms a sealed chamber, where the notch communicates with the outside under predetermined pressure, ensuring the valve's protection and facilitating airtightness testing while preventing foreign object entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the explosion-proof valve is exposed on the cover plate to enable pressure relief function, then the pressure relief function is achieved, but the valve is susceptible to damage from foreign objects and environmental factors during prolonged use
Solution Approach 1:
The patent introduces a protective patch as an intermediary element between the external environment and the explosion-proof valve. This protective patch allows pressure to pass through (enabling pressure relief) while blocking foreign objects (preventing damage). The protective patch acts as a mediator that selectively permits certain substances (gas/pressure) while excluding others (foreign objects), thus resolving the contradiction between maintaining valve exposure for function and protecting it from harm.
2Object-affected harmful factors
If the protective patch is made thicker to enhance protection, then the protective performance is improved, but the airtightness testing becomes more difficult and the notch may not open properly under predetermined pressure
Solution Approach 1:
The patent establishes specific parameter ranges for the protective patch: thickness b between 0.01-1.2mm and notch length-to-thickness ratio a/b between 5-100. These parameter specifications ensure that the protective patch is thick enough to provide adequate protection while remaining thin enough to allow proper airtightness testing and pressure-induced opening. By controlling these parameters within specific ranges, the patent resolves the contradiction between protective performance and testing accuracy.
3Reliability
If the notch in the protective patch is made longer to ensure proper opening under pressure, then the pressure relief capability is improved, but the structural strength of the protective patch is reduced
Solution Approach 1:
The patent specifies that the notch length-to-thickness ratio a/b should be between 5-100. This ratio control ensures that the notch is sufficiently long to open properly under predetermined pressure for pressure relief, while the thickness b (0.01-1.2mm) maintains adequate structural strength. The controlled ratio prevents the notch from being excessively long relative to thickness, thus balancing pressure relief capability with structural integrity.
4Manufacturing precision
If the protective patch is made thinner to improve airtightness testing, then the testing accuracy is improved, but the protective performance against foreign objects is reduced
Solution Approach 1:
The patent establishes a minimum thickness b of 0.01mm for the protective patch, which ensures adequate protection against foreign objects while remaining thin enough for effective airtightness testing. Combined with the notch length-to-thickness ratio control (a/b = 5-100), this minimum thickness specification balances the contradiction between protective performance and testing accuracy by preventing the patch from being excessively thin.
Data Source
Figure 1
Figure 2
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AI summary
A battery and a battery apparatus are provided. The battery pack includes a cover plate (10), an explosion-proof valve (20) arranged on the cover plate (10), and a protective patch (30). The protective patch (30) is arranged on an outer side of the cover plate (10). A sealed chamber (111) is formed between the explosion-proof valve (20) and the protective patch (30), and a notch (31) penetrating through the protective patch (30) is arranged on the protective patch (30) in a thickness direction. When a predetermined pressure is applied, the sealed chamber (111) communicates with an outside through the notch (31). The notch (31) has a total length of a and the protective patch (30) has a thickness of b, where 5 ≤ a/b ≤ 100 and 0.01 mm ≤ b ≤ 1.2 mm, and the protective patch (30) has a tensile strength of c, where c/b = xb-1.073.