Battery Cell Housing Recessed Zone for Stronger Cover Welding
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Solution Overview
Problem
The reliability of battery cells is compromised due to cracking and failure risks at the welding position between the cover and the housing during charge and discharge cycles, affecting the performance and lifespan of battery cells in various devices.
Innovation Solution
A battery cell design featuring a recessed zone in the housing, where the thickness of the opening part is relatively thick compared to the body part, reducing the risk of cracking and failure while improving space utilization and energy density by allowing for a stronger connection and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing thickness is increased to ensure welding strength between cover and housing, then the reliability is improved, but the space utilization rate and energy density deteriorate
Solution Approach 1:
The housing employs variable thickness design where the opening part has greater thickness than the body part. This local quality differentiation ensures that welding strength is enhanced only at the critical opening part where the cover is welded, while the body part maintains reduced thickness to optimize space utilization and energy density.
2Reliability
If the opening part thickness is increased to prevent cracking at welding position, then the reliability is improved, but the weight and space occupation increase
Solution Approach 1:
The housing structure implements local quality by concentrating increased thickness specifically at the opening part to enhance cracking resistance at the welding position. The body part maintains thinner walls to minimize overall weight increase while still providing sufficient structural support.
3Quantity of substance
If the body part thickness is reduced to improve space utilization, then the energy density is improved, but the welding strength at opening part deteriorates
Solution Approach 1:
The housing design applies local quality by differentiating thickness between the opening part and body part. The opening part maintains greater thickness to ensure adequate welding strength, while the body part uses reduced thickness to maximize space utilization and energy density.
Solution Approach 2:
The housing is segmented into two distinct regions with different thickness characteristics: the opening part with greater thickness for structural integrity and welding strength, and the body part with reduced thickness for space optimization. This segmentation allows each region to be optimized for its specific function.
Data Source
AI summary
A battery cell includes a housing and a cover. The housing is provided with an opening and a chamber. The housing includes an opening part and a body part, where the opening part surrounds the opening and the body part surrounds the chamber. The cover is connected to the opening part and closes the opening. At least a partial region of the body part is recessed relative to the opening part to form a recessed zone, a thickness of the recessed zone being less than that of the opening part.