Battery Cell Shell Scored Groove Structure for Easier Pressure Relief
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Solution Overview
Problem
The manufacturing of scored grooves on battery cell outer shells is challenging due to high equipment requirements, leading to increased costs and risks of cracks during the formation process, with poor material flow and structural consistency.
Innovation Solution
A battery cell design with grooves on opposite surfaces of the wall portion, allowing a scored groove on the bottom surface, reducing depth and processing difficulty, and enhancing material flow and structural consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a scored groove is provided directly on the wall portion of the outer shell, then the pressure relief function is achieved, but the manufacturing difficulty increases and the risk of cracks rises
Solution Approach 1:
The patent applies preliminary action by providing first and second grooves on opposite surfaces of the wall portion before forming the scored groove. This preliminary grooving thins the wall portion at the scored groove location, making subsequent scored groove formation easier and reducing manufacturing difficulty while maintaining the pressure relief function.
2Reliability
If the depth of the scored groove is increased to ensure pressure relief, then the pressure relief efficiency improves, but the forming force required increases and cracks may occur
Solution Approach 1:
The first and second grooves are formed in advance on opposite surfaces of the wall portion, removing material before the scored groove is created. This preliminary material removal reduces the depth needed for the scored groove while ensuring adequate pressure relief, thereby reducing forming force and minimizing the risk of cracks during processing.
3Productivity
If grooving is performed on only one side of the wall portion, then the processing steps are reduced, but excessive material displacement occurs and structural consistency deteriorates
Solution Approach 1:
The patent uses asymmetric grooving by providing the first groove on the first surface and the second groove on the opposite second surface of the wall portion. This asymmetric arrangement on opposite sides balances material displacement during processing, improving material flow uniformity and structural consistency while maintaining processing efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces manufacturing costs and improves production quality by lowering equipment demands and mitigating cracks, while increasing pressure relief efficiency and structural consistency.
Implementation Method 1
the wall portion is capable of rupturing along the scored groove during pressure relief of the battery cell
Data Source
AI summary
The battery cell includes an outer shell, the outer shell has a wall portion, and along a thickness direction of the wall portion, the wall portion has a first surface and a second surface opposite to each other. The first surface is provided with a first groove, the second surface is provided with a second groove at a position corresponding to the first groove, a bottom surface of the first groove is provided with a scored groove, and the wall portion is capable of rupturing along the scored groove during pressure relief of the battery cell. This battery cell can reduce the depth required to provide the scored groove on the wall portion. It can reduce the forming force exerted on the wall portion in processing the scored groove. It can improve the morphology of a flow material during the formation of the scored groove.