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 external terminal installation due to the need for electrical connection between positive and negative electrodes, limiting the flexibility in terminal placement.
Innovation Solution
The design includes a step structure in the electrode assembly with a first region being relatively high and a second region being relatively low, allowing for electrical connections between positive and negative electrodes through connecting tabs and extended tabs to an external terminal, thereby avoiding restrictions on terminal installation location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an electrode assembly with step structure is used to improve space utilization, then the battery can accommodate more electrodes, but the installation location of external terminal becomes restricted
Solution Approach 1:
The electrode assembly is divided into multiple regions (first region with higher electrodes, second region with lower electrodes). Connecting tabs are used to electrically connect electrodes within the same region, while extended tabs provide external connection points. This segmentation allows the external terminal to be installed in the second region without interfering with the electrical connections in the first region, thus resolving the contradiction between space utilization and terminal installation flexibility.
2Reliability
If connecting tabs are used to electrically connect all positive and negative electrodes, then electrical connection is ensured, but the structure becomes more complex
Solution Approach 1:
Multiple connecting tabs from the same polarity electrodes are merged into a single extended tab that extends to the exterior body. This merging reduces the number of separate connection points needed while maintaining electrical connection among all electrodes. The extended tab serves both as an electrical connector and as an external terminal, thereby reducing structural complexity while ensuring reliable electrical connection.
Data Source
AI summary
A secondary battery having an electrode assembly and an electrolyte in an exterior body. The electrode assembly includes a step structure including a first region and a second region lower than and adjacent to the first region. The electrode assembly includes at least one of a positive electrode side connecting portion that connects each of positive electrode side connecting tabs of all positive electrodes in the first region and a negative electrode side connecting portion that connects each of the negative electrode side connecting tabs of all negative electrodes in the first region. At least one of a positive electrode side extended tab of at least one of the positive electrodes and a negative electrode side extended tab of at least one of the negative electrodes in the second region are configured to be electrically connected to an external terminal.