Battery Cell Pressure Relief Hole Reinforcement Against Premature Venting
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Solution Overview
Problem
Existing battery cells face premature pressure relief component actuation due to deformation and damage under internal and external forces, leading to poor stability and reduced service life.
Innovation Solution
A reinforcement member is integrated into the pressure relief hole of the battery cell's shell, connected to the hole wall surface, enhancing structural strength and protecting the pressure relief component from deformation and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief component is arranged in the pressure relief hole to enable pressure release function, then the safety of the battery cell is improved, but the structural strength of the wall portion is reduced leading to deformation and premature actuation
Solution Approach 1:
The reinforcement member is nested within the pressure relief hole, positioned between the pressure relief component and the external environment. This nesting arrangement allows the reinforcement member to strengthen the wall portion without interfering with the pressure relief component's function, effectively resolving the contradiction between safety and structural strength.
Solution Approach 2:
The reinforcement member acts as an intermediary element between the pressure relief component and the wall portion. It provides mechanical support to the wall portion while allowing the pressure relief component to function independently, thus preventing deformation that would lead to premature actuation while maintaining the safety function.
2Strength
If the wall portion is made thicker to improve structural strength, then the deformation resistance is improved, but the space utilization and energy density of the battery cell are reduced
Solution Approach 1:
Instead of increasing the overall wall thickness, the reinforcement member is nested within the existing pressure relief hole structure. This approach provides the necessary structural strength and deformation resistance without increasing the external dimensions of the battery cell, thereby maintaining space utilization and energy density.
Solution Approach 2:
The reinforcement member extends in the thickness direction of the wall portion, utilizing the available space within the pressure relief hole. This dimensional arrangement allows the reinforcement to be integrated without increasing the footprint or overall volume of the battery cell.
3Speed
If the pressure relief component is made more sensitive to internal pressure, then the pressure release response is improved, but the component becomes more susceptible to premature actuation due to deformation
Solution Approach 1:
The reinforcement member is installed beforehand to provide structural support and cushioning to the wall portion. This prevents deformation that would otherwise cause premature actuation, allowing the pressure relief component to maintain its sensitivity and respond appropriately only when actual overpressure conditions occur.
Solution Approach 2:
The reinforcement member serves as an intermediary that isolates the pressure relief component from mechanical deformation caused by external forces. This mediation allows the pressure relief component to remain sensitive to internal pressure changes while being protected from deformation that would lead to premature actuation.
Data Source
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Figure 3
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AI summary
The present application provides a battery cell, a battery, and an electrical apparatus, and belongs to the field of battery technologies. The battery cell includes a shell, a pressure relief component, and a reinforcement member. The shell has a wall portion, and the wall portion is provided with a pressure relief hole. The pressure relief component is arranged in the pressure relief hole and covers the pressure relief hole. The reinforcement member is arranged in the pressure relief hole and does not exceed the pressure relief hole in a thickness direction of the wall portion. The reinforcement member is connected to a hole wall surface of the pressure relief hole. The reinforcement member and the pressure relief component are arranged in the thickness direction of the wall portion to reinforce the strength of the wall portion at the pressure relief hole. This battery cell is capable of improving, by the reinforcement member, the structural strength of a region of the wall portion where the pressure relief hole is arranged, so as to alleviate the phenomenon that the pressure relief hole deforms when the wall portion is subjected to internal and external impact forces, thereby being capable of playing a protective role for the pressure relief component, so as to reduce the impact to the pressure relief component when the wall portion is subjected to the internal and external impact forces, which is conducive to alleviating the deformation of or damage to the pressure relief component, so as to improve reliability in use of the battery cell.