Battery Cell Electrode Corner Structure to Prevent Ion Precipitation
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Solution Overview
Problem
The issue of ion precipitation at the corner portions of an electrode assembly occurs due to the insufficient capacity ratio of the negative electrode plate on the inner side of the positive electrode plate, leading to inefficient ion intercalation and affecting the charging and discharging cycle and reliability of the battery cell.
Innovation Solution
An active structure is interposed between the first and second segments, the solution involves disposing a positive electrode plate and a negative electrode plate, and the electrode assembly is disposed between the first and second segments, the solution involves stacking and winding a positive electrode plate and a negative electrode plate, and a separator, and the separator is disposed between the positive electrode plate and the negative electrode plate, with an active structure configured to intercalate ions between the first and second bent segments, thereby alleviating ion precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode assembly is formed by stacking and winding positive and negative electrode plates, then the electrode assembly can be divided into a straight portion and two corner portions, but the winding length of the positive electrode plate is greater than that of the negative electrode plate on the inner side, causing insufficient capacity ratio and ion precipitation at corner portions
Solution Approach 1:
The electrode assembly is segmented into a straight portion and two corner portions, with the positive electrode plate further divided into first straight segments and first bent segments. This segmentation allows different regions to have different configurations, enabling the straight segments to be alternately stacked to form the straight portion while bent segments form corner portions, thereby resolving the capacity ratio imbalance at corners
Solution Approach 2:
The patent introduces a new dimension by adding an active structure between the first bent segments and second bent segments at the corner portions. This active structure provides an additional ion intercalation pathway, transforming the problem from a two-dimensional electrode plate stacking issue to a three-dimensional ion transport solution, effectively alleviating ion precipitation at corner portions
2Reliability
If the negative electrode plate on the inner side has insufficient capacity to contain intercalated ions, then ion precipitation occurs at corner portions, but adding more negative electrode material increases device complexity
Solution Approach 1:
An active structure is introduced as an intermediary component between the first bent segments and second bent segments at the corner portions. This active structure serves as a mediator for ion intercalation, providing an additional pathway for ions to be accommodated without requiring significant changes to the existing electrode plate configurations, thus maintaining structural simplicity while improving ion intercalation efficiency
Solution Approach 2:
The patent applies local quality by placing the active structure specifically at the corner portions where ion precipitation occurs, rather than uniformly modifying the entire electrode assembly. This localized approach addresses the specific problem at corner portions without unnecessarily increasing the complexity of the overall electrode structure
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 active structure effectively intercalates ions, improving the charging and discharging cycle performance and reliability of the battery cell by preventing ion precipitation at the corner portions.
Implementation Method 1
an active structure, disposed between the first bent segments and the second bent segments adjacent thereto along an inner side, and configured to intercalate ions
Data Source
AI summary
A battery cell, a battery, an electric device, and a processing method for a battery cell are provided. The battery cell comprises an electrode assembly and active structures. The electrode assembly comprises a positive electrode sheetand a negative electrode sheet, wherein the positive electrode sheet comprises first straight segments and first bent segments, and the negative electrode sheet comprises second straight segments and second bent segments, the first straight segmentsand the second straight segments are alternately stacked to form straight portions, and the first bent segments and the second bent segments are alternately stacked to form corner portions. At least some of the active structures are provided between the first bent segments and the second bent segments adjacent to the inner sides of the first bent segments. In this way, the problem of ion precipitation at the corner portions can be solved.