Battery Cell Housing Structure to Reduce Case Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The performance of battery cells is often compromised by the risk of cracking in the case, which is exacerbated by integral stretch forming during manufacturing.
Innovation Solution
A case design comprising a first case portion with integrally formed walls and a second case portion fixedly connected to these walls, allowing for a joint formation in the depth direction, reducing the risk of cracking and improving assembly accuracy and strength through tailor-welding and controlled material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the case is integrally formed through stretch forming, then the structural strength and reliability are improved, but the risk of cracking during manufacturing increases
Solution Approach 1:
The case is divided into a first case portion and a second case portion that are separately formed and then connected. The first case portion includes a first wall and second wall that are integrally formed, while the second case portion is separately formed and fixedly connected to the first case portion. This segmentation reduces the cracking risk during integral stretch forming while maintaining structural strength through the fixed connection between portions.
2Ease of manufacture
If the case is formed as a single integral structure, then the manufacturing process is simplified, but the assembly accuracy and welding quality deteriorate
Solution Approach 1:
The case is segmented into a first case portion and a second case portion with specific functional divisions. The second case portion includes two openings that allow independent cover plate preparation and better disposal of electrode terminals. This segmentation improves assembly accuracy while maintaining manufacturing efficiency through standardized connection processes.
Solution Approach 2:
Different portions of the case have different structural characteristics optimized for their specific functions. The first case portion has integrally formed walls for structural strength, while the second case portion has openings for assembly purposes. This local quality differentiation improves overall assembly accuracy without compromising manufacturing simplicity.
3Volume of moving object
If the ratio of H to h1 is increased, then the space utilization is improved, but the welding position becomes too close to the first case portion causing stress concentration
Solution Approach 1:
The patent specifies that the ratio of H to h1 should be within a specific range to balance space utilization and welding strength. This parameter control ensures that the welding position is not too close to the first case portion, avoiding stress concentration and cracking, while still achieving good space utilization in the battery cell design.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Embodiments of the present application provide a case, a battery cell, a battery, and a power consuming apparatus. The case includes a first case portion and a second case portion. An opening is formed in the first case portion. The first case portion includes a first wall opposite to the opening and a second wall connected to the first wall. The first wall and the second wall are integrally formed. The second case portion is fixedly connected to the second wall. In a depth direction of the first case portion, at least a portion of regions of the case is jointly formed by the first case portion and the second case portion. According to the case, the battery cell, the battery, and the power consuming apparatus in the embodiments of the present application, a risk of cracking of the case can be reduced.