Battery Cell Housing Structure for Crack-Resistant End Welding
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Solution Overview
Problem
Battery cell shells are prone to cracking, affecting their use reliability due to factors such as expansion stress from the electrode assembly and vibration.
Innovation Solution
The shell body design includes specific plate configurations with varying thicknesses and concave surfaces to accommodate electrode expansion, reduce stress concentration, and enhance structural strength, thereby minimizing cracking risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shell body is made with uniform thickness plates, then the manufacturing process is simple, but the structural strength at critical locations is insufficient leading to cracking
Solution Approach 1:
The patent applies local quality by making the second plate part of the connecting plate thicker than the first plate part. This localized thickness increase provides enhanced structural strength at the welding location where stress concentration occurs, while maintaining simpler construction in other areas. The different thicknesses are specifically designed to address the cracking issue at the welding position without unnecessarily complicating the entire shell body structure.
2Reliability
If the shell body is made with thicker plates to increase strength, then cracking resistance improves, but the energy density of the battery cell decreases
Solution Approach 1:
The patent uses local quality by increasing the thickness of only the second plate part at the critical welding location, rather than making the entire shell body thicker. This localized reinforcement provides improved cracking resistance where needed while minimizing the overall material usage, thereby preserving the battery cell's energy density.
Solution Approach 2:
The patent applies partial action by providing thickness enhancement only at the specific location where cracking occurs (the second plate part near the welding position), rather than uniformly throughout the entire shell body. This partial reinforcement is sufficient to address the reliability issue without the excessive material consumption that would reduce energy density.
3Reliability
If the shell body is designed with thicker plates to withstand expansion stress, then reliability improves, but the internal space for electrode assembly is reduced
Solution Approach 1:
The patent applies local quality by concentrating the thickness increase only in the second plate part of the connecting plate, rather than increasing the thickness of all shell body components. This localized reinforcement provides the necessary reliability to withstand expansion stress while minimizing the impact on the overall internal space available for the electrode assembly.
4Reliability
If the shell body uses complex plate configurations to prevent cracking, then reliability improves, but the manufacturing complexity increases
Solution Approach 1:
The patent uses local quality to achieve reliability improvement with minimal impact on manufacturability. By modifying only the thickness of specific plate parts (the second plate part being thicker than the first) rather than redesigning the entire shell body structure, the solution maintains relative manufacturing simplicity while addressing the cracking issue.
Data Source
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AI summary
The present invention provides a housing, a battery cell, a battery, and an electrical device. An end portion of the housing along a first direction is provided with a housing opening, the housing comprises a first side plate and a second side plate arranged along the circumferential direction of the housing opening, a connecting plate is connected to the first side plate and the second side plate, at least part of an outer surface of the connecting plate comprises a curved face, the connecting plate comprises a first plate portion and a second plate portion, and on the first direction, the second plate portion is located on the side of the first plate portion close to the housing opening. The maximum thickness of the second plate portion is greater than or equal to the maximum thickness of the first plate portion. The embodiments of the present application can reduce the risk of cracking and damage at a welding position between the second plate portion and an end cover caused by housing deformation or battery cell vibration due to factors such as expansion stress of an electrode assembly, and improve the usage reliability of the battery cell.