Segmented Battery Module Terminals for Low-Resistance Pack Layout
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Solution Overview
Problem
Long-width and ultra-long-width battery cells face issues with increased internal resistance, heat generation, and structural instability, leading to performance deterioration and reduced lifespan, particularly in vehicle applications.
Innovation Solution
A battery system with improved connection structures for battery modules, including stacked battery cells with alternating polarity terminals and independent bus bar assemblies, minimizing internal resistance and optimizing cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery cell width is increased to 600 mm or more to improve energy density and meet spatial constraints, then the energy density and spatial efficiency are improved, but the internal resistance increases and power loss increases
Solution Approach 1:
The patent divides the battery cell into multiple battery modules, each with its own terminals. This segmentation allows each module to have shorter current paths and lower internal resistance while maintaining the overall large width for high energy density. The modules are connected in parallel to achieve the desired capacity without the power loss associated with a single large cell.
2Quantity of substance
If the battery cell width is increased to 600 mm or more to improve energy density, then the energy density is improved, but the temperature difference between regions increases and performance deteriorates
Solution Approach 1:
By dividing the large battery cell into multiple smaller modules, the patent reduces the temperature difference within each module. The smaller size of each module allows for more uniform heat distribution and easier thermal management, while the overall system maintains high energy density through the parallel arrangement of multiple modules.
3Quantity of substance
If the battery cell width is increased to 600 mm or more to improve energy density, then the energy density is improved, but the structural stability decreases and the cell bends due to its own weight
Solution Approach 1:
The patent divides the large battery cell into multiple smaller modules, each with independent structural support and terminals. This segmentation reduces the weight and structural stress on each individual module, preventing bending and deformation. The modules are then assembled together to form the complete battery pack, achieving high energy density without compromising structural stability.
Solution Approach 2:
The patent transitions from a single large two-dimensional battery cell to a three-dimensional arrangement of multiple smaller modules. This dimensional change allows for better structural distribution and support, reducing the risk of bending while maintaining the overall energy density through optimized spatial arrangement of the modules.
4Quantity of substance
If the battery cell width is increased to 600 mm or more to improve energy density, then the energy density is improved, but the lifespan is reduced
Solution Approach 1:
By dividing the large battery cell into multiple smaller modules, the patent reduces the stress and heat generation in each individual module. This segmentation leads to more uniform aging characteristics and reduced degradation rates, thereby extending the overall lifespan of the battery system while maintaining high energy density through the parallel configuration of modules.
Data Source
AI summary
A battery system includes a plurality of battery modules including battery cells in which electrode tabs having different polarities are formed at both ends thereof, wherein a plurality of battery cells are stacked. The plurality of battery modules includes: a first terminal having a first positive electrode terminal and a first negative electrode terminal, which are formed by connecting electrode tabs located at one end of the battery cells to each other among the plurality of electrode tabs; and a second terminal having a second positive electrode terminal and a second negative electrode terminal, which are formed by connecting electrode tabs located at the other end of the battery cells to each other among the plurality of electrode tabs. The first and second terminals of any one battery module of the plurality of battery modules are arranged to be electrically connected with the first and second terminals of battery modules adjacent to the any one battery module.