Battery Module Symmetric Common Nodes Current Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery modules for electric vehicles face challenges in maximizing driving distance due to uneven current distribution and temperature variations among battery cells, leading to reduced efficiency and lifespan.
Innovation Solution
A battery module configuration with symmetrically located common nodes in the connection members between battery cells, ensuring balanced current flow and reduced temperature deviations, achieved by strategically placing common nodes within the battery cell stack to minimize current and temperature differences among cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery cells are connected in parallel to increase capacity, then the driving distance increases, but current distribution becomes uneven among battery cells
Solution Approach 1:
The connection members are divided into multiple segments with intermediate connection points, rather than having a single centralized connection. This segmentation allows current to be distributed more evenly across multiple connection points, reducing current concentration on specific battery cells while maintaining high capacity through parallel connection
Solution Approach 2:
Different regions of the connection members are designed with different connection point locations to create non-uniform current distribution patterns that compensate for natural current concentration. The first and second connection members have asymmetric connection point arrangements that locally adjust current flow to achieve more uniform overall current distribution across all battery cells
2Quantity of substance
If battery cells are connected in parallel to increase capacity, then the driving distance increases, but temperature variations among battery cells increase
Solution Approach 1:
The connection members are divided into multiple segments with intermediate connection points, distributing heat generation across multiple locations rather than concentrating it at single connection points. This segmentation reduces localized thermal hotspots and promotes more uniform temperature distribution among battery cells
Solution Approach 2:
The asymmetric arrangement of connection points on different connection members creates localized current distribution patterns that reduce current concentration on specific cells. This local quality adjustment prevents excessive heat generation at particular cells, thereby reducing temperature variations across the battery pack
3Device complexity
If conventional connection member configuration is used, then device complexity is low, but current and temperature deviations among battery cells increase
Solution Approach 1:
The first and second connection members are designed with asymmetric connection point arrangements relative to each other. The first connection member has connection points at different locations than the second connection member, creating a non-symmetric overall structure that optimizes current distribution and reduces deviations among battery cells
Data Source
AI summary
A battery module includes: a battery cell stack including a plurality of battery cells; a first connection member coupled to anode terminals of the plurality of battery cells; and a second connection member coupled to cathode terminals of the plurality of battery cells. The first connection member includes a first common node to which a first module terminal is coupled. The second connection member includes a second common node to which a second module terminal is coupled. The first common node is located between a center of the battery cell stack and a first battery cell, among first and second battery cells located at outermost sides of the battery cell stack. The second common node is located between the second battery cell and the center of the battery cell stack.