Lithium-Ion Battery Formation Control for Consistent SEI Film
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Solution Overview
Problem
Existing lithium-ion battery formation processes fail to adapt to material batch differences and dimensional tolerances, leading to inconsistent SEI film formation and electrical performance among battery cells.
Innovation Solution
A control method that determines optimal film formation quality by analyzing historical data sets, adjusting parameters like formation current, temperature, and gas production to ensure consistent SEI film formation across battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constant charging currents are adopted at two to three stages with continuous negative pressure drawing, then the formation process can be completed, but the SEI film formation quality becomes inconsistent among battery cells due to material batch differences and dimensional tolerances
Solution Approach 1:
The patent applies dynamics by transitioning from constant charging currents to dynamically adjusted charging currents. The system continuously monitors formation quality in real-time and adjusts charging parameters adaptively during the formation process, allowing each battery cell to receive customized charging based on its actual state, thereby resolving the contradiction between production efficiency and formation consistency
Solution Approach 2:
The patent implements feedback control by establishing real-time monitoring of formation quality indicators (such as voltage, current, temperature, and gas production) and using this information to dynamically adjust charging parameters. This closed-loop feedback mechanism ensures that deviations in SEI film formation are detected and corrected promptly, maintaining consistency across battery cells while preserving productivity
2Ease of operation
If existing formation processes are used, then the process is simple to operate, but the electrical performance inconsistency among battery cells is aggravated due to inability to adapt to cell differences
Solution Approach 1:
The patent applies self-service by enabling the formation system to automatically monitor, evaluate, and adjust charging parameters without manual intervention. The system autonomously identifies formation quality deviations and implements corrective actions, maintaining electrical performance consistency while keeping the operation process simple and reducing the need for complex manual control
3Productivity
If material batch differences and dimensional tolerances are present in mass production, then production volume is high, but performance differences between battery cells are inevitable and aggravated by existing formation processes
Solution Approach 1:
The patent applies local quality by implementing individualized formation control for each battery cell based on its specific characteristics. The system monitors formation quality parameters for each cell separately and adjusts charging parameters locally, allowing each cell to undergo formation tailored to its unique properties, thereby maintaining performance uniformity across high-volume production
Data Source
AI summary
Disclosed are a control method for lithium-ion battery formation and a lithium-ion battery formation system. The control method includes: determining film formation quality of a target lithium-ion battery; obtaining a plurality of formation data sets of the lithium-ion battery, each of which includes a plurality of data groups in a one-to-one correspondence with a plurality of formation time points during the formation process; determining an optimal film formation quality corresponding to each formation time point from the plurality of the formation data sets according to constraint conditions, and obtaining an expected film formation quality corresponding to each formation time point; and adjusting target parameters in a parameter adjustment order determined according to a deviation when the deviation between the film formation quality and the expected film formation quality does not satisfy a predetermined requirement.