Secondary Battery Electrode Assembly Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries face limitations in increasing energy density due to electrode plate damage from high loading levels, which restricts the curvature and leads to breakage and loss of active material during winding and pressing.
Innovation Solution
A secondary battery design featuring a first electrode assembly with stacked plates and a second electrode assembly wound around it, using separators to prevent internal short circuits and maintain a minimum curvature radius, allowing for higher loading levels without damaging the electrode plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the loading level of the electrode plate is increased to heighten energy density, then the energy density is improved, but the electrode plate bending curvature becomes extremely small and the electrode plate may be broken
Solution Approach 1:
The electrode assembly is divided into multiple electrode plates (first, second, third, fourth electrode plates) that are stacked and wound in a specific configuration. This segmentation allows each plate to maintain adequate bending curvature while achieving high overall loading levels, preventing breakage while maintaining energy density.
Solution Approach 2:
The electrode plates are nested in a stacked configuration where multiple plates are arranged one on top of another and then wound together. This nested structure enables high loading levels to be achieved while maintaining the structural integrity of individual plates through proper curvature distribution.
2Quantity of substance
If the electrode plate is folded to achieve high loading level, then the energy density is improved, but the electrode plate may be broken due to extremely small bending curvature
Solution Approach 1:
The electrode assembly is wound into a curved configuration with controlled minimum curvature radius. This curvature design ensures that the bending radius remains sufficiently large to prevent electrode plate breakage while achieving high loading levels through the compact wound structure.
Solution Approach 2:
The invention changes the geometric parameters of the electrode assembly by specifying a minimum curvature radius for the wound structure. This parameter control ensures adequate bending curvature is maintained throughout the assembly, preventing electrode plate failure while achieving high loading levels.
3Volume of moving object
If the electrode plate is pressed to accommodate in a case, then the battery structure is compacted, but the electrode plate may be broken due to high pressure
Solution Approach 1:
The electrode plates are pre-assembled into a stacked and wound configuration with proper curvature before final assembly. This preliminary structuring ensures the plates can withstand subsequent pressing operations without breaking, as the curved structure distributes mechanical stresses more effectively.
Solution Approach 2:
The wound configuration with minimum curvature radius acts as a cushioning structure that absorbs and distributes mechanical stresses during pressing operations. This beforehand structural design prevents stress concentration that would otherwise lead to electrode plate breakage during case assembly.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A secondary battery including a first electrode assembly (110) including first and second electrode plates (10, 20) stacked on each other; and a second electrode assembly (120) including third and fourth electrode plates (30, 40), wherein the second electrode assembly (120) is wound along an outer circumference of the first electrode assembly (110). The secondary battery has a high energy density and is capable of preventing damage of the electrode plates.