Battery Cell End Cover Assembly for Secondary Electrolyte Injection
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Solution Overview
Problem
Existing battery technologies face challenges in prolonging the life of lithium-ion batteries used in electrical vehicles, as the electrolyte undergoes irreversible reactions during charging and discharging cycles, leading to capacity degradation.
Innovation Solution
The proposed solution involves an end cover assembly for battery cells that includes a rotatable cover body connected to a sealing piece via a boss and second hole configuration, allowing for detachable connection and simplified operation during secondary liquid injection, thereby facilitating electrolyte replenishment and maintaining the sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover body is fixed to the end cover, then the sealing integrity is maintained, but the secondary liquid injection operation becomes complex and time-consuming
Solution Approach 1:
The cover body is designed to be rotatable relative to the end cover through a boss and second hole configuration, transitioning between a fixed state (providing sealing integrity) and a movable state (enabling easy removal for secondary liquid injection). This dynamic design allows the same structure to serve multiple functions without compromising either sealing reliability or operational ease.
2Reliability
If the sealing piece is permanently sealed to the first hole, then electrolyte leakage is prevented, but electrolyte replenishment requires complex operations
Solution Approach 1:
The sealing piece seals the first hole in a normal state to prevent electrolyte leakage, but the rotatable cover body can be removed to expose the first hole for electrolyte replenishment. This dynamic design allows the sealing function to be temporarily suspended when needed, enabling efficient electrolyte replenishment without compromising overall reliability.
3Stability of the object's composition
If the cover body and end cover are permanently connected, then structural stability is ensured, but operation time for maintenance increases
Solution Approach 1:
The cover body is rotatably connected to the end cover through a boss inserted into a second hole, allowing it to maintain a stable fixed position during normal operation while enabling quick rotational removal for maintenance. This dynamic connection provides structural stability when needed but allows rapid disassembly, significantly reducing maintenance operation time compared to permanent connections.
Data Source
Figure 1-A~1-D
Figure 2~4
Figure 5~8
AI summary
The present application relates to an end cover assembly, a battery cell, a battery, a power consumption device and a liquid injection method. The end cover assembly (10) is applied to the battery cell (600) and includes an end cover (1), a sealing piece (2) and a cover body (3), wherein the end cover (1) is provided with a first hole (11) for injecting electrolyte; the sealing piece (2) is configured to seal the first hole (11); the cove body (3) is configured to cover at least part of the sealing piece (2), and the cover body (3) is rotatable relative to the end cover (1) to realize detachable connection between the cover body (3) and the end cover (1); one of the sealing piece (2) and the cover body (3) is provided with a second hole (21), and the other one of the sealing piece (2) and the cover body (3) is provided with a boss (31); and the boss (31) is configured to be inserted into the second hole (21), and the boss (31) and the second hole (21) are relatively rotatable to realize rotatable connection between the sealing piece (2) and the cover body (3).