Battery Cell Pressure Relief Reinforcement Against Premature Actuation
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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 release internal pressure, then the safety of the battery cell is improved, but the pressure relief component deforms and damages under internal and external impact forces, leading to premature actuation and reduced reliability
Solution Approach 1:
A reinforcement member is arranged in the pressure relief hole before the pressure relief component is installed. The reinforcement member serves as a cushioning structure that absorbs and distributes impact forces, protecting the pressure relief component from deformation and damage under internal and external impact forces, thereby preventing premature actuation and improving reliability
Solution Approach 2:
The reinforcement member acts as an intermediary structure between the pressure relief component and the pressure relief hole wall. It mediates the transmission of impact forces, reducing the direct stress on the pressure relief component while maintaining the structural integrity of the pressure relief hole
2Strength
If the wall portion thickness is increased to strengthen the pressure relief hole region, then the strength and protective effect are improved, but the space utilization and energy density of the battery cell are reduced
Solution Approach 1:
The reinforcement member is nested within the pressure relief hole, utilizing the existing space in the hole rather than requiring additional wall thickness. This nested arrangement provides structural reinforcement while maintaining the original external dimensions of the battery cell, thus preserving space utilization and energy density
Solution Approach 2:
Instead of increasing strength by adding thickness in the radial direction (which would reduce space), the reinforcement member is arranged in the axial direction within the pressure relief hole. This dimensional shift provides reinforcement without compromising the battery cell's volume efficiency
Data Source
AI summary
The present application relates to the field of battery technologies and provides a battery cell, a battery, and an electrical apparatus. The battery cell includes a shell, a pressure relief component, and a reinforcement member. The shell comprises a wall portion that is formed with a pressure relief hole. The pressure relief component is disposed within the pressure relief hole and covers the hole. The reinforcement member is also disposed within the pressure relief hole, and its thickness does not exceed that of the wall portion. The reinforcement member is connected to an inner surface of the pressure relief hole and, together with the pressure relief component, is arranged along the thickness direction of the wall portion to reinforce the structural strength of the shell at the pressure relief location.