Electrode Assembly Blocking Groove for Lithium Plating Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery designs face safety issues due to lithium plating on the first electrode plate during charge-discharge cycles, which can lead to uneven thickness and reduced safety performance, as active lithium ions diffuse from the second electrode plate to the first electrode plate's tab groove.
Innovation Solution
Incorporating a blocking groove on the second electrode plate with an alignment region, which prevents active lithium from reaching the first tab groove, thereby avoiding lithium plating and enhancing safety performance while maintaining thickness uniformity by not reducing the thickness of the region where the first tab groove is located.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active substances are removed from the second electrode plate to form a groove, then lithium plating is prevented, but the thickness uniformity of the electrode assembly is reduced
Solution Approach 1:
The patent introduces a blocking groove as an intermediary structure on the second electrode plate. This groove acts as a physical barrier that intercepts and blocks active lithium ions before they can reach the tab groove area of the first electrode plate, thereby preventing lithium plating without requiring removal of active substances from the opposing electrode plate, thus maintaining thickness uniformity
Solution Approach 2:
The second electrode plate is segmented into different functional regions: a blocking groove region that prevents lithium ion transport to the tab groove area, and an alignment region that maintains electrical connection. This segmentation allows the blocking groove to prevent lithium plating while preserving the overall structure and thickness uniformity of the electrode assembly
2Reliability
If a groove is formed on the second electrode plate, then lithium plating is prevented, but after several charge-discharge cycles the lithium plating phenomenon still exists
Solution Approach 1:
The blocking groove serves as a persistent intermediary barrier that remains effective throughout multiple charge-discharge cycles. By positioning the groove on the second electrode plate rather than removing material from the first electrode plate's tab groove area, the structure maintains its blocking function over time, preventing lithium plating phenomenon from recurring after several cycles
Solution Approach 2:
The blocking groove is pre-formed on the second electrode plate before assembly, creating a preliminary barrier that proactively prevents active lithium ions from reaching the vulnerable tab groove area of the first electrode plate. This preliminary protective action ensures long-term prevention of lithium plating throughout the battery's operational life
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 blocking groove effectively prevents lithium plating on the first electrode plate, improving the safety and thickness uniformity of the battery, reducing the risk of lithium dendrite formation and separator puncture.
Implementation Method 1
active lithium ions in the second electrode plate will be free and diffuse to the tab groove of the first electrode plate
Data Source
AI summary
An electrode assembly includes a first electrode plate, a second electrode plate, and a separator located between the first electrode plate and the second electrode plate; the first electrode plate includes a first current collector and a first membrane disposed on the first current collector, and the first membrane is provided with a first tab groove; and the second electrode plate includes a second current collector and a second membrane disposed on the second current collector, the second membrane is provided with a blocking groove and an alignment region defined by the blocking groove, and a projection of the alignment region on the first electrode plate covers the first tab groove.