Stepped Electrode Assembly Layout for Compact High-Energy Battery Terminals
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Solution Overview
Problem
The challenge is to increase the energy density of batteries in limited spaces within electrical terminals, such as electronic devices and electric vehicles, while maintaining compactness and preventing damage or short circuits.
Innovation Solution
An electrochemical device with a stacked electrode assembly and a shell design, featuring a first and second electrode plate group with specific dimensional relationships and spacings, allowing for efficient space utilization and assembly, and incorporating insulation layers to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the battery compartment space is reduced to accommodate more components, then the integration degree of the electrical terminal is improved, but the energy density of the battery is worsened
Solution Approach 1:
The electrode assembly is segmented into a first electrode plate group and a second electrode plate group with different dimensions along the first direction. This segmentation allows the electrode assembly to be arranged in a stepped configuration within the shell, maximizing space utilization in the battery compartment while maintaining high energy density.
Solution Approach 2:
The patent introduces a stepped structure that utilizes the third direction (height/thickness dimension) more effectively. By creating steps in the electrode assembly arrangement, the design transforms a two-dimensional space utilization problem into a three-dimensional solution, allowing components to be stacked vertically while maintaining compactness.
2Quantity of substance
If the electrode assembly is made larger to increase energy density, then the endurance is improved, but the space for other components in the battery compartment is reduced
Solution Approach 1:
The electrode assembly is divided into two groups with different dimensions, allowing them to be arranged in a stepped configuration. This segmentation enables the electrode assembly to occupy more volume within the shell while still leaving space for other components in the battery compartment through the stepped arrangement.
Solution Approach 2:
The stepped structure allows smaller components to be nested within the space created by the dimensional differences of the electrode plate groups. The first and second electrode plate groups create recesses and protrusions that can accommodate other battery components efficiently.
3Quantity of substance
If the spacing between the electrode assembly and shell is reduced to maximize space utilization, then the energy density is improved, but the risk of damage or short circuit is increased
Solution Approach 1:
The patent applies different spacing requirements to different regions of the electrode assembly. The first electrode plate group has specific spacing requirements from the first side of the shell, while the second electrode plate group has different spacing requirements from the second side of the shell. This localized quality approach allows maximum space utilization while maintaining safety margins in critical areas.
4Quantity of substance
If the electrode assembly is designed with complex stepped structures to optimize space, then the energy density is improved, but the manufacturing complexity is increased
Solution Approach 1:
The electrode assembly is segmented into two distinct electrode plate groups that can be manufactured separately and then assembled. This segmentation simplifies the manufacturing process compared to creating a single complex stepped structure, as each group can be produced using standard electrode manufacturing techniques and then combined to form the final stepped configuration.
Data Source
AI summary
An electrode assembly is a stacked structure. The electrode assembly includes a first electrode plate group and a second electrode plate group stacked up. A dimension of the first electrode plate group along the first direction is smaller than a dimension of the second electrode plate group along the first direction. A first step is formed at a minimum of one end of the electrode assembly along the first direction. A second step corresponding to the first step is formed on the shell.