Battery Cell End Cover Assembly for Accurate State Detection
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Solution Overview
Problem
Existing battery cell technologies face challenges in detecting state information in real-time, leading to safety risks and reduced cycling life due to interference between detecting assemblies and insulating members, which affects the accuracy and connection strength.
Innovation Solution
An end cover assembly with a detecting assembly and an insulating member featuring an avoiding structure to reduce interference, improve connection strength, and enhance detecting accuracy, including a concave part for accommodating the detecting assembly and a convex part for increased strength and space, along with electrode terminals and wire harnesses for voltage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detecting assembly is added to monitor battery state information, then safety and cycling performance are improved, but the detecting assembly interferes with the insulating member, reducing connection strength and detecting accuracy
Solution Approach 1:
The end cover is divided into a flat portion and a protruding portion, with the detecting assembly specifically arranged on the protruding portion. This segmentation allows the detecting assembly to be spatially separated from the insulating member, eliminating interference while maintaining detecting accuracy and connection strength.
2Measurement precision
If the detecting assembly is placed on the end cover surface, then real-time state information detection is enabled, but the assembly occupies space and reduces energy density
Solution Approach 1:
The end cover is designed with a protruding portion that extends in the radial direction, creating additional spatial dimension for accommodating the detecting assembly. This dimensional extension allows the detecting assembly to be positioned without occupying valuable axial space that would otherwise be used for active materials, thereby maintaining energy density while enabling real-time detection.
3Object-affected harmful factors
If the insulating member covers the entire end cover surface, then insulation performance is improved, but it interferes with the detecting assembly, reducing connection strength
Solution Approach 1:
The insulating member is designed with a local quality approach by providing an avoiding structure (avoiding groove or avoiding hole) at the specific location where the detecting assembly is positioned. This allows the insulating member to maintain its insulation function over most of the end cover surface while creating a localized region free of insulating material, enabling the detecting assembly to be firmly connected to the end cover without interference.
Data Source
AI summary
Embodiments of the present application provide an end cover assembly of a battery cell, a battery cell, a battery and an electricity-consuming apparatus. The end cover assembly includes an end cover, a detecting assembly and an insulating member. The detecting assembly is arranged on the end cover and configured to detect a state information of the battery cell. The insulating member is attached to a surface of the end cover away from an electrode assembly of the battery cell, and provided with an avoiding structure which is configured to avoid at least a portion of the detecting assembly.