Battery Core Connecting Assembly for Low-Stress Top Cover Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium-ion battery connection methods, particularly for stacked batteries, face challenges such as high internal resistance, short battery life, and difficulty in achieving reliable and consistent connections between electrode plates and the top cover, leading to stress concentration and increased metal debris generation.
Innovation Solution
A battery core connecting assembly featuring a multi-layer adapting piece with a pliable section and a single-layer connecting piece that reduces tab protrusion, allows for easy bending, and utilizes laser welding for reliable connections, suitable for both wound and stacked lithium-ion batteries, reducing stress concentration and material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer connecting piece is used for welding with the top cover, then welding ease and connection reliability are improved, but the tab protruding length increases and material loss increases
Solution Approach 1:
The connecting piece is divided into a multi-layer adapting piece portion and a single-layer connecting piece portion. The multi-layer adapting piece reduces tab protrusion and material loss, while the single-layer connecting piece ensures easy welding with the top cover. This segmentation allows each portion to optimize its specific function.
Solution Approach 2:
Different portions of the connecting piece have different structural qualities: the adapting piece portion has a multi-layer structure for reduced material loss and better fit, while the connecting piece portion has a single-layer structure for welding ease. This local quality differentiation resolves the contradiction between material conservation and manufacturing ease.
2Reliability
If a multi-layer adapting piece is used to reduce tab protrusion, then material loss is reduced and connection reliability is improved, but the structure complexity increases
Solution Approach 1:
The connecting assembly is segmented into a multi-layer adapting piece and a single-layer connecting piece. This segmentation allows the complex multi-layer structure to be localized only where needed (at the tab connection point), while the rest of the structure remains simple and easy to manufacture.
Solution Approach 2:
The multi-layer adapting piece and single-layer connecting piece are merged into a single integrated component. This merging simplifies the overall assembly process while maintaining the reliability benefits of the multi-layer structure at the critical connection point.
3Ease of operation
If the adapting piece has a pliable part with multi-layer structure, then bending ease and stress distribution are improved, but manufacturing complexity increases
Solution Approach 1:
The pliable part with multi-layer structure is localized only at the bending section of the adapting piece, where flexibility is needed. The rest of the connecting piece maintains a simple single-layer structure for ease of manufacturing. This local quality approach resolves the contradiction between bending ease and manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable, long-lasting connection with reduced stress concentration and material loss, improving the service life and consistency of lithium-ion battery connections while minimizing the risk of metal debris and self-discharge voltage defects.
Implementation Method 1
the adapting piece has a multi-layer structure at least at the pliable part... which is easier to bend compared with the single-layer structure
Implementation Method 2
with easy welding such as laser welding of the single-layer structure of the connecting piece
Data Source
AI summary
A battery core connecting assembly and a battery are provided in this disclosure. The battery core connecting assembly is configured for connecting a core of a lithium-ion battery. The lithium-ion battery includes a top cover, and the battery core connecting assembly includes an adapting piece and a connecting piece which at least in part includes a single-layer structure. The adapting piece includes a first tongue and a second tongue which are connected with each other, the first tongue is configured to be welded with the core, the adapting piece is pliable at a pliable part of the first tongue and the second tongue, and the adapting piece has a multi-layer structure at least at the pliable part. The connecting piece is connected with the second tongue of the adapting piece, and the connecting piece is welded with the top cover at a position of the single-layer structure.