Battery Cell Pressure Relief Layout Near Cover Plate Weld Seams
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Solution Overview
Problem
The existing battery manufacturing process faces challenges in ensuring that the explosion-proof valve bursts and releases pressure in time when internal temperature and pressure rise sharply due to the welding seam increasing the explosion pressure, potentially leading to battery explosions.
Innovation Solution
A battery cell design with a pressure relief apparatus featuring a weak region at least 3 mm away from the welding seam, allowing for controlled pressure release and incorporating multiple pressure relief ports with varying sizes to achieve a gradient explosion effect, ensuring timely pressure relief and maintaining the original designed pressure threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edge of the weak region is positioned close to the welding seam to maximize the weak region area, then the pressure relief capability is improved, but the explosion pressure increases due to the welding seam's influence
Solution Approach 1:
The patent applies local quality by creating a weak region with specifically controlled properties (reduced thickness or material strength) at a defined distance from the welding seam. This localized modification allows the weak region to have different mechanical properties than the surrounding areas, enabling it to fail at a lower, predetermined pressure while the rest of the cover plate maintains structural integrity. The weak region's distance of 3-10mm from the welding seam ensures it is influenced less by the welding-induced stress concentration, allowing it to burst at the designed lower pressure threshold.
2Productivity
If multiple pressure relief apparatus are provided to increase pressure relief speed, then the pressure relief capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the pressure relief function into multiple independent pressure relief apparatus (first and second pressure relief apparatus with first and second weak regions). Each apparatus can operate independently to release pressure, providing redundant pressure relief pathways. This segmentation increases the overall pressure relief capability and speed while distributing the function across multiple simpler components rather than one complex apparatus.
Data Source
AI summary
The present application provides a battery cell, a battery, and an electrical apparatus. The battery cell may comprise a case, a cover plate, and a pressure relief apparatus. The case may have an opening; the cover plate may cover the opening, and the cover plate may be welded with the case to form a welding seam; the pressure relief apparatus may be disposed on the cover plate, the pressure relief apparatus may be provided with a weak region, the weak region may be configured to be broken to release internal pressure when the internal pressure or temperature of the battery cell reaches a threshold, and the minimum distance between the edge of the weak region and the welding seam may be greater than or equal to 3 mm.