Cylindrical Battery Cell Tab Layout for Higher Active Material Use
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Solution Overview
Problem
The energy density of large cylindrical secondary batteries is relatively low due to inefficient utilization of active material space.
Innovation Solution
The battery cell design includes specific edge distance relationships (H1 < H2) between electrode tabs and edges, ensuring increased active material area and height occupation within a given battery height, enhanced by flattening processes without cutting tabs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large cylindrical secondary battery is used, then low internal resistance and high energy density are achieved, but the energy density is relatively low compared to other battery configurations
Solution Approach 1:
The patent applies asymmetry by making the first edge distance (H1) smaller than the second edge distance (H2), creating an asymmetric electrode assembly structure. This asymmetric design allows for more efficient space utilization of active materials while maintaining the cylindrical form factor, thereby improving energy density without significantly increasing structural complexity
Solution Approach 2:
The patent transitions from traditional symmetric radial design to an asymmetric design that effectively utilizes the axial dimension. By controlling edge distances differently in opposite directions (H1 vs H2), the design optimizes the three-dimensional arrangement of electrode materials, increasing energy density by better utilizing available space in the cylindrical battery
2Quantity of substance
If the distance H1 between first edge and fourth edge is reduced, then the utilization rate of active material in height space increases, but the distance between edges becomes asymmetric
Solution Approach 1:
The patent deliberately introduces asymmetry in edge distances (H1 < H2) to achieve better active material utilization. The asymmetric configuration allows the electrode assembly to more efficiently fill the cylindrical housing volume, increasing the proportion of active material while maintaining proper electrical connections and structural integrity
Data Source
AI summary
A battery cell and a battery module. The battery cell includes: a housing and an electrode assembly accommodated in the housing, where the electrode assembly includes a positive electrode sheet, a separator and a negative electrode sheet, which are arranged to be mutually stacked, the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the separator is provided with a first edge and a second edge arranged opposite to each other in a first direction X; the positive electrode sheet is connected to a positive electrode tab; the negative electrode sheet is connected to a negative electrode tab; the positive electrode tab is provided with a third edge away from the positive electrode sheet in the first direction X; the negative electrode tab is provided with a fourth edge away from the negative electrode sheet in the first direction X.