Electrode Assembly Protrusion Prevents Lithium Ion Accumulation
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Solution Overview
Problem
Secondary batteries face stability issues due to lithium ion accumulation in the separator, which occurs when the coated surface of the cathode tab deviates from the anode plate during charge and discharge processes.
Innovation Solution
An electrode assembly with a second electrode plate featuring a protrusion that overlaps the first electrode tab, ensuring lithium ions are transferred to the anode plate even if the coated surface of the cathode tab deviates, preventing accumulation in the separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coated surface of the cathode tab deviates from the anode plate during charge and discharge processes, then lithium ion transfer efficiency decreases, but lithium ion accumulation in the separator increases
Solution Approach 1:
The anode plate is designed with a protrusion at a specific location that corresponds to the cathode tab position. This local structural modification ensures that even when the cathode tab deviates from the ideal alignment position, the protrusion provides a dedicated lithium ion transfer pathway, maintaining reliable operation without requiring high manufacturing precision across the entire electrode assembly.
2Reliability
If a protrusion is added to the anode plate to prevent lithium ion accumulation, then battery stability improves, but device complexity increases
Solution Approach 1:
The anode plate is segmented into different regions: a main body area and a protrusion area. The protrusion is a localized structural feature that provides specific functionality (lithium ion transfer pathway) without requiring complete redesign of the entire anode plate structure. This segmented approach adds minimal complexity while achieving the stability improvement.
3Reliability
If the area of the first electrode plate is made smaller than the second electrode plate, then lithium ion distribution is improved, but manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring precise control of the entire first electrode plate area, the invention uses a local protrusion feature on the second electrode plate that corresponds to the cathode tab position. This local structural adjustment achieves improved lithium ion distribution without imposing strict manufacturing precision requirements on the overall plate area dimensions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrode assembly enhances the stability of secondary batteries by preventing lithium ion accumulation in the separator, thereby improving overall battery performance.
Implementation Method 1
a separator insulating the first electrode plate and the second electrode plate
Implementation Method 2
lithium ion accumulation in a separator... prevents lithium ion accumulation in the separator
Data Source
AI summary
An electrode assembly according to an embodiment of the present invention includes a first electrode plate having a fist electrode tab at an end of one side thereof, a second electrode plate having a second electrode tab, which is formed in a same direction as a longitudinal direction of the first electrode tab and is formed at a position not overlapping the first electrode tab, and a protrusion which is formed at a position overlapping the fist electrode tab, and a separator insulating the first electrode plate and the second electrode plate. Therefore, the electrode assembly according to the embodiment of the present invention and the secondary battery including the same may improve the stability of the secondary battery by preventing lithium ion accumulation in a separator.