Recessed Battery Cell End Cover for Flush Pressure Relief
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Solution Overview
Problem
Existing lithium-ion battery designs face challenges in increasing energy density due to the space occupied by pressure relief components, which protrude from the end cover and reduce the available capacity space.
Innovation Solution
The proposed end cover assembly features a recessed groove section with a pressure relief component that does not protrude from the top surface of the end cover, allowing for increased internal space within the battery cell without altering its total height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief component protrudes from the end cover, then the safety performance is improved, but the energy density deteriorates due to reduced internal space
Solution Approach 1:
The pressure relief component is nested within the recessed groove section of the end cover, allowing it to be contained within the existing external dimensions of the battery cell. This nesting approach enables the safety component to occupy space that would otherwise be structural, thereby maintaining the cell's overall height while increasing internal capacity space for electrode plates and active materials.
Solution Approach 2:
The design transitions from a protruding pressure relief component (occupying height dimension) to a recessed component (utilizing depth dimension of the groove). By moving the pressure relief component into the recessed groove section, the solution exploits the depth dimension of the end cover structure, freeing up height space that can be converted into additional internal volume for energy-storing components.
2Volume of stationary object
If the pressure relief component is recessed into the end cover, then the internal space is increased, but the positioning accuracy may deteriorate
Solution Approach 1:
The pressure relief component features a second protruding part that automatically engages with the groove section during assembly, creating self-positioning and self-fixing functionality. This self-service mechanism ensures accurate positioning without requiring additional external fixtures or complex alignment procedures, maintaining manufacturing precision while enabling the recessed design.
Solution Approach 2:
The second protruding part of the pressure relief component acts as an intermediary element that mediates between the component and the groove section. This intermediary structure provides precise geometric engagement, ensuring accurate positioning and stable installation of the pressure relief component within the recessed groove section during the assembly process.
Data Source
AI summary
Embodiments of this application provide an end cover assembly, a battery cell, a battery, and an electric apparatus, where the end cover assembly includes an end cover and a pressure relief component, the end cover is provided with a recessed groove section recessed toward the inside of the battery cell, the pressure relief component is disposed within the groove section, and a top surface of the pressure relief component, facing away from the inside of the battery cell, has a distance to the groove bottom of the groove section that is less than or equal to the depth of the groove section. Thus, the pressure relief component does not protrude from the top surface of the end cover, thereby not occupying additional space in the height direction of the battery cell.