Traction Battery Charging with SOH-Based Anti-Plating Control
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Solution Overview
Problem
Lithium precipitation in traction batteries during charging reduces performance and shortens cycle life, posing safety risks such as combustion and explosion.
Innovation Solution
A method for charging traction batteries that involves controlling discharge or stopping charge based on State of Health (SOH) and State of Charge (SOC) intervals, using a battery management system (BMS) to prevent lithium precipitation by adjusting discharging and charging stopping times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous charging is applied to traction battery, then charging speed is improved, but lithium precipitation occurs reducing battery life and safety
Solution Approach 1:
The patent implements periodic charging and discharging cycles during the charging process. When SOC reaches predetermined thresholds (e.g., 80%-90%), the system switches from charging mode to discharging mode for a predetermined time period, then returns to charging mode. This periodic alternation prevents continuous charging that causes lithium precipitation while maintaining overall charging efficiency.
2Reliability
If charging stopping interval is extended to prevent lithium precipitation, then battery safety is improved, but charging efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the charging stopping interval based on battery state parameters including SOC (State of Charge) and SOH (State of Health). The predetermined SOC thresholds and time periods are not fixed but adapt according to real-time battery conditions, allowing the system to extend or reduce the charging stopping interval dynamically to balance safety requirements with charging efficiency.
Solution Approach 2:
The system changes operational parameters (SOC thresholds, time periods, charging current) based on battery state. When SOC reaches certain levels or SOH indicates degraded battery condition, the parameters are adjusted to implement longer discharging intervals or reduced charging current, thereby preventing lithium precipitation while optimizing charging performance under different conditions.
Data Source
AI summary
Provided are a method for charging a traction battery and a battery management system. The method for charging the traction battery is applied to a battery management system, where the method includes: obtaining an SOH of the traction battery; in a charging process of the traction battery, obtaining an SOC of the traction battery; determining an SOC interval value corresponding to discharging or stopping being charged of the traction battery based on the SOH of the traction battery; and when the SOC of the traction battery changes by the SOC interval value, controlling the traction battery to discharge or stop being charged. Through the technical solution, in the charging process of the traction battery, the discharging or the stopping being charged of the traction battery can be controlled to reduce the risk of lithium precipitation in the traction battery and improve the safety performance of the traction battery.