Battery End Cover Assembly with Flow Channel Leak Detection
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Solution Overview
Problem
Secondary batteries experience air or liquid leakage after initial sealing performance tests, leading to safety concerns due to false sealing caused by compression deformation of plastic materials in the end cover assembly, which is not detected during factory testing.
Innovation Solution
Incorporating a first connected flow channel in the end cover assembly that communicates the inside and outside of the battery cell when the sealing piece is invalid, allowing detection of false sealing and improving the sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing piece is used to seal the installation hole, then sealing performance is improved, but false sealing occurs due to compression deformation of plastic materials that is not detected during factory testing
Solution Approach 1:
A detection flow channel is introduced as an intermediary element that connects the internal cavity to the external environment through the terminal assembly. This flow channel serves as a mediator to transfer the sealing status from the installation hole to a detectable state, allowing testing instruments to accurately detect false sealing conditions that would otherwise remain hidden during factory testing
Solution Approach 2:
The detection flow channel establishes a feedback mechanism where the sealing status of the installation hole is continuously reflected to the external testing system. When the sealing piece deforms or fails, the feedback pathway through the flow channel allows the testing instrument to receive real-time information about the sealing condition, enabling accurate detection and preventing false sealing from going unnoticed
2Ease of manufacture
If the end cover assembly structure is simplified, then manufacturing ease is improved, but sealing detection capability during manufacturing is reduced
Solution Approach 1:
The detection flow channel is merged with the existing terminal assembly structure, combining the sealing detection function with the terminal components. This integration allows the detection capability to be built into the manufacturing process without requiring separate detection systems or complex additional structures, maintaining manufacturing simplicity while enabling sealing detection
Solution Approach 2:
The terminal assembly is designed to serve multiple functions: it provides electrical connection through the terminal components and simultaneously serves as the pathway for sealing detection through the integrated flow channel. This multi-functionality allows a single structural element to fulfill both electrical and detection roles, avoiding the need for separate dedicated detection structures
Data Source
AI summary
The present disclosure relates to an end cover assembly, a battery cell, a battery pack and a device. The end cover assembly includes a cover assembly, a terminal assembly, a sealing piece and a first connected flow channel. The cover assembly is provided with an installation hole, and the installation hole penetrates through the cover assembly along an axial direction of the installation hole; the terminal assembly is installed in the installation hole; the sealing piece is configured to seal the installation hole; the first connected flow channel is arranged in at least one of the terminal assembly and the cover assembly, and the first connected flow channel is configured as follows: when the sealing of the sealing piece is invalid, the first connected flow channel enables the inside and the outside of the housing to be communicated through the installation hole.