Equal Distribution Connecting Member for Battery Packs
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Solution Overview
Problem
Middle- or large-sized battery packs for electric vehicles face internal resistance differences due to varying bus bar lengths, leading to current disparities and reduced lifespan, with existing solutions complicating manufacturing and increasing costs.
Innovation Solution
A connecting member with a first common connection circuit and varying second connection circuits, where sectional areas and lengths adjust with distance to equalize internal resistances, using metal plates or wires that can be easily cut and assembled to maintain uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lengths or thicknesses of connection circuits are changed to equalize internal resistances, then the internal resistance uniformity is improved, but the manufacturing complexity and cost are increased
Solution Approach 1:
The patent applies local quality by making different parts of the connection circuit have different properties. Specifically, the connection circuits are designed with varying lengths or thicknesses at different locations to compensate for distance differences from the external circuit connection point, thereby equalizing internal resistances without requiring complex overall design changes
Solution Approach 2:
The patent changes physical parameters of the connection circuits (length, thickness) to achieve equalized internal resistances. By adjusting these parameters based on the distance from the external circuit connection point, the system achieves uniform current distribution while maintaining simple manufacturing processes
2Manufacturing precision
If different connection circuits are precisely calculated for each battery module position, then the internal resistance equalization is improved, but the manufacturing flexibility and adaptability are reduced
Solution Approach 1:
The patent segments the connection circuit design into standardized modules that can be selectively assembled. By creating a set of pre-calculated connection circuits with different specifications, the system achieves precise internal resistance equalization for various battery module positions while maintaining manufacturing flexibility through modular assembly
3Ease of manufacture
If the connection circuits are designed with fixed lengths and thicknesses, then the manufacturing process is simplified, but the internal resistance differences cause current disparities between battery modules
Solution Approach 1:
The patent applies local quality by making different parts of the connection circuit have different properties. Specifically, the connection circuits are designed with varying lengths or thicknesses at different locations to compensate for distance differences from the external circuit connection point, thereby equalizing internal resistances without requiring complex overall design changes
Solution Approach 2:
The patent changes physical parameters of the connection circuits (length, thickness) to achieve equalized internal resistances. By adjusting these parameters based on the distance from the external circuit connection point, the system achieves uniform current distribution while maintaining simple manufacturing processes
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
This solution reduces manufacturing costs, improves flexibility, and prevents current disparities, extending the battery pack's lifespan by ensuring uniform internal resistances and efficient charging/discharging.
Implementation Method 1
the connection circuits are constructed in a structure in which the lengths or thicknesses of the connection circuits are changed depending upon the distances between the respective connection circuits such that the connection circuits have the same internal resistance
Data Source
AI summary
Disclosed herein are an equal distribution type connecting member for connecting two or more devices to an external circuit, the connection member including a first connection circuit connected to a connection point of the external circuit, and second connection circuits sequentially connected to the first connection circuit, the second connection circuits being constructed in a structure in which the sectional areas of the second connection circuits are increased and/or the lengths of the second connection circuits are decreased with the increase of the connection distance between the connection point of the external circuit and connection points of the devices, thereby equalizing internal resistances between the connection point of the external circuit and the connection points of the devices, and a middle- or large-sized battery pack including the same. The equal distribution type connecting member according to the present invention is capable of reducing the difference in internal resistances of the circuits, thereby increasing the overall life span of the battery pack. Also, the uniform charging and discharging efficiency of battery modules or battery cells is acquired, and therefore, it is possible to manufacture battery modules having optimized performance and a middle- or large-sized battery pack including the same.