Battery Cell Bus Bar Parallel Connection for Resistance Reduction
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Solution Overview
Problem
In medium and large-capacity battery cells, the internal resistance of the positive and negative electrode plates increases with higher current usage, leading to decreased output, particularly in applications requiring high-energy characteristics like vehicles.
Innovation Solution
The solution involves forming two electrode taps on each of the positive and negative electrode plates and connecting them in parallel with busbars to distribute current, reducing the resistance within the electrode assembly and preventing output decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery cell is lengthened in the longitudinal direction to increase capacity, then the energy storage increases, but the internal resistance increases due to longer foils, causing output to decrease
Solution Approach 1:
The patent divides the single electrode tap connection into multiple segments by forming first and second electrode taps at opposite ends of the electrode plate. This segmentation allows current to be distributed through multiple parallel paths (first busbar and second busbar), reducing the effective resistance even as the battery is lengthened for increased capacity.
2Device complexity
If a single electrode tap is used to simplify the structure, then the manufacturing process is simple, but the resistance increases in medium and large capacity batteries, reducing output
Solution Approach 1:
The patent transitions from a single-point connection (one electrode tap) to a distributed multi-point connection system. By utilizing both ends of the electrode plate (spatial dimension), the patent creates parallel current paths through first and second busbars, effectively reducing resistance without significantly increasing structural complexity.
3Power
If the current through the lead increases to meet high-energy requirements, then the energy output increases, but the resistance of the electrode plates increases, causing output to decrease
Solution Approach 1:
The patent merges the current path by creating parallel connections through first and second busbars that connect to first and second electrode taps respectively. This merging of current paths in parallel reduces the overall resistance, allowing higher current to flow through the leads without increasing electrode plate resistance, thereby maintaining reliability under high-power conditions.
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 configuration effectively reduces the internal resistance of the battery cell, maintaining output without altering the typical module or pack structure, thus enhancing the battery's performance in high-current applications.
Implementation Method 1
a bus bar and the electrode taps are connected in parallel to distribute current through a electrode lead, so that the resistance of the positive electrode plate and the negative electrode plate constituting the electrode assembly is decreased
Data Source
AI summary
The present invention relates to a battery cell in which a foil functioning as a busbar is adopted in the battery cell, and thus, the resistance of the battery cell is reduced to increase the output of the battery cell.