Long-Width Secondary Battery Current Path Layout for Lower Resistance
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Solution Overview
Problem
Long width secondary batteries used in electric vehicles and hybrid vehicles face high resistance due to the long widths of their cathode and anode plates, leading to significant losses in electrical output.
Innovation Solution
The battery design incorporates additional uncoated portions on the cathode and anode plates, connected by conductive members that increase the cross-sectional area of current movement paths, thereby reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the width of cathode and anode plates is increased to achieve long width secondary battery, then the battery capacity and electrical output potential are improved, but the current movement path length increases causing higher resistance
Solution Approach 1:
The battery is divided into multiple battery units, each with its own electrode assemblies. Current collectors are segmented into multiple regions (first through fourth regions) that can be independently connected to tabs, allowing current to be collected from multiple locations rather than traveling the full length of the plate, thus reducing resistance while maintaining the long width configuration.
Solution Approach 2:
The current collection strategy moves from a one-dimensional path along the length of the plate to a two-dimensional distribution across multiple regions and tabs. By providing multiple current collection points distributed across the width and length of the electrode assemblies, the current path is shortened in the longitudinal direction while the overall battery width is maintained.
2Loss of energy
If additional uncoated portions and conductive members are added to reduce resistance, then the electrical output loss is minimized, but the device complexity increases
Solution Approach 1:
The current collectors serve multiple functions: they act as structural support for the active materials, provide current collection pathways through their conductive nature, and function as interconnection elements between different battery units. The uncoated portions specifically serve as current collection zones without the added resistance of active material coatings.
Solution Approach 2:
Multiple battery units are electrically connected in parallel through their respective current collectors and tabs. The first and second battery units share common current collection paths through the current collectors, reducing the overall resistance of the battery pack while maintaining a compact structure that integrates multiple functional elements.
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 design effectively reduces the resistance of the long width secondary battery, minimizing electrical output losses and improving the battery's strength and assembly efficiency.
Implementation Method 1
the first cathode uncoated portion and the second cathode uncoated portion are connected to a cathode tab positioned on a second side of the first electrode assembly by a cathode conductive member, and the first anode uncoated portion and the second anode uncoated portion are connected to an anode tab positioned on a first side of the second electrode assembly by an anode conductive member
Data Source
Figure 1
Figure 2A~3
Figure 4
AI summary
In the present invention, not only a movement path of a current generated from a first electrode assembly, but also a movement path of a current generated from a second electrode assembly are provided by a cathode conductive member, and not only a movement path of the current generated from the second electrode assembly, but also a movement path of the current generated from the first electrode assembly are provided by an anode conductive member, such that cross sectional areas of the current movement paths are increased. Therefore, a resistance of the long width secondary battery may be reduced.