Secondary Battery Electrode Assembly Step Structure Terminal Placement
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Solution Overview
Problem
Secondary batteries with a step structure in the electrode assembly face restrictions on the installation location of external terminals due to the need for electrical connection between positive and negative electrodes.
Innovation Solution
The electrode assembly is configured with a step structure having a first region with a higher cross-sectional height and a second region with a lower height, where positive and negative electrode connecting portions and extended portions are used to connect tabs to external terminals, allowing for flexible installation of terminals without spatial restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an electrode assembly with a step structure is used, then space utilization is improved, but the installation location of external terminals is restricted
Solution Approach 1:
The electrode assembly is divided into a first electrode assembly (higher step) and a second electrode assembly (lower step), creating distinct regions. The external terminals can be installed on different sides depending on which electrode assembly is accessed, thereby resolving the location restriction while maintaining space efficiency
Solution Approach 2:
The invention utilizes the vertical dimension created by the step structure to enable flexible terminal installation. By having electrodes extend to different heights and providing connection options at multiple vertical levels, the system achieves adaptability in terminal placement without compromising the compact step design
2Reliability
If multiple electrode connections are made in the first region, then electrical connectivity is improved, but device complexity increases
Solution Approach 1:
The invention extracts the electrical connection function to the electrode tabs that extend into the second region (lower step). By taking out the connection points from the complex first region and placing them in the accessible second region, it simplifies the wiring structure while maintaining reliable electrical connectivity
Solution Approach 2:
The electrode tabs serve as intermediaries between the electrodes in the first region and the external terminals. These tabs extend into the second region, providing a simple connection interface that reduces wiring complexity while ensuring reliable electrical connection
Data Source
AI summary
A secondary battery in which an electrode assembly including positive electrodes, negative electrodes, and separators disposed between the positive electrodes and the negative electrodes, and an electrolyte are housed in an exterior body. The electrode assembly has a step structure including a first region having a relatively high cross-sectional height and a second region having a relatively low cross-sectional height adjacent to the first region. The electrode assembly includes at least one of a positive electrode side connecting portion and a negative electrode side connecting portion in the first region. At least one of a positive electrode side extended portion and a negative electrode side extended portion in the second region is configured to be electrically connected to an external terminal.