Battery Cell Adapting Member Multilayer Structure for Low Internal Resistance
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Solution Overview
Problem
The existing battery technologies face challenges in achieving high output power due to heat loss issues, such as poor heat management and large internal resistance, which are exacerbated by the small thickness of the adapting member used in battery cells.
Innovation Solution
The adapting member's thickness is locally increased to enhance the overcurrent area, reducing its resistance and improving the battery cell's output power. This is achieved while maintaining the ability to bend and weld conveniently, using a multilayer structure for the first connection portion and a single-layer structure for the second connection portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the adapting member's thickness is increased to reduce resistance and improve output power, then the internal resistance decreases and output power improves, but the device complexity increases due to the multilayer structure
Solution Approach 1:
The adapting member is divided into a multilayer structure with a first connection portion (multiple layers) and a second connection portion (single layer), allowing different regions to have different thicknesses optimized for their specific functions while maintaining overall structural integrity
Solution Approach 2:
The first connection portion uses a multilayer structure with increased thickness specifically where high current density and low resistance are critical, while the second connection portion maintains single-layer simplicity where bending flexibility is prioritized, achieving local optimization without global complexity
2Reliability
If the adapting member's thickness is increased to reduce resistance, then the electrical conductivity improves, but the ease of manufacture deteriorates due to welding and bending difficulties
Solution Approach 1:
The adapting member is segmented into regions with different thickness characteristics - the first connection portion has increased thickness for electrical performance, while the second connection portion maintains original thickness for manufacturing ease, allowing each region to be optimized independently
Solution Approach 2:
The multilayer structure is applied locally only to the first connection portion where electrical conductivity is critical, while the second connection portion remains single-layer for easy bending and welding, achieving local electrical optimization without global manufacturing complexity
Data Source
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AI summary
An embodiment of the present application provides a battery cell, a battery, a power consumption device, and a battery cell manufacturing method and device, which belong to the field of battery technologies. The battery cell includes an adapting member, the adapting member includes a first connection portion for connecting an electrode terminal and a second connection portion for connecting an electrode assembly, the first connection portion and the second connection portion are dividedly set and connected to each other, and the first connection portion is in a multilayer structure and includes multiple layers of conductive sheets provided in a stacking manner, the second connection portion is in a single-layer structure, and a minimum thickness of the first connection portion is greater than a maximum thickness of the second connection portion. The battery cell has smaller internal resistance, which can increase an output power of the battery cell, and meet the requirements of a power-type battery.