Battery Cell Adapting Member Structure for Low-Resistance Current Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing battery technologies have low output power due to high internal resistance, which cannot meet the requirements of power-type batteries, primarily attributed to the small overcurrent area and high resistance of the adapting member connecting the electrode assembly to the electrode terminal.
Innovation Solution
A battery cell design featuring a multilayer first connection portion with increased thickness and a single-layer second connection portion, allowing for convenient bending and process welding while reducing internal resistance, thereby enhancing the overcurrent capacity and output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the adapting member uses a single-layer structure with small thickness, then it is easy to bend and process, but the overcurrent area is small and resistance is high
Solution Approach 1:
The adapting member transitions from a single-layer planar structure to a multilayer stacked structure. Multiple conductive sheets are arranged in layers along the thickness direction, increasing the overcurrent area in the vertical dimension. This allows the member to maintain thin individual layers for bendability while achieving large total cross-sectional area for current conduction.
Solution Approach 2:
The adapting member is constructed as a composite structure with multiple conductive sheets stacked together. Each layer maintains the conductivity and flexibility of the base material, while the composite multilayer configuration provides enhanced current carrying capacity and reduced resistance through increased effective cross-sectional area.
2Reliability
If the first connection portion is made thicker to increase overcurrent area, then resistance decreases, but bending becomes difficult
Solution Approach 1:
The first connection portion is segmented into multiple thin conductive sheets stacked together. Each individual sheet remains thin and flexible for easy bending, while the stacked arrangement of multiple sheets collectively provides large total thickness and overcurrent area. The segmentation allows each layer to bend independently while maintaining overall structural integrity.
Solution Approach 2:
Instead of increasing thickness in a single direction, the solution distributes the thickness across multiple layers in the vertical dimension. Each layer remains thin for flexibility, but the cumulative thickness of stacked layers provides the necessary overcurrent area. This dimensional distribution resolves the conflict between thinness for bending and thickness for conduction.
3Reliability
If the adapting member uses multilayer structure with large thickness, then overcurrent area increases and resistance decreases, but the structure becomes complex
Solution Approach 1:
The multilayer structure segments the adapting member into identical or similar conductive sheets stacked together. This segmentation creates a modular architecture where each layer has the same structure and properties, simplifying manufacturing and assembly. The repetitive modular units reduce overall structural complexity despite the increased number of components.
Solution Approach 2:
Each conductive sheet in the multilayer structure serves the same function of conducting current, and all layers are structurally identical or similar. This universality allows for standardized manufacturing processes and simplifies the overall design. The repeating modular units make the complex multilayer structure manageable through standardization.
Data Source
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.