Dynamic SOC Limit Adjustment for Battery Durability
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Solution Overview
Problem
The durability of high-voltage batteries in electric vehicles is compromised by the degradation caused by varying charge conditions, particularly due to the limited operational range of State of Charge (SOC), which affects usable energy and battery lifespan.
Innovation Solution
A battery charging apparatus and method that allows users to select the SOC range based on driving modes, utilizing a controller and Battery Management System (BMS) to optimize charging, switching between high and low SOC charges depending on driving distance and patterns, thereby controlling the charge current and duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery is charged to high SOC (95%) using slow charge method, then the usable energy and drivable distance are improved, but the battery durability and lifespan are degraded
Solution Approach 1:
The patent implements dynamic SOC limit adjustment based on driving patterns. The system continuously monitors driving distance and time, and dynamically sets the SOC charge limit: for short-distance driving (below average), the limit is set to 80% to protect battery durability; for long-distance driving (above average), the limit is increased to 95% to maximize usable energy. This dynamic adaptation resolves the contradiction by adjusting the charge level based on actual usage needs.
Solution Approach 2:
The patent changes the SOC parameter threshold based on driving pattern analysis. By calculating the average driving distance over a predetermined period and comparing current driving distance against this average, the system changes the SOC charge limit parameter between 80% and 95%. This parameter change strategy allows the system to optimize between battery durability and usable energy based on actual driving requirements.
2Length of moving object
If the battery is charged to high SOC (95%) continuously, then the drivable distance is extended, but the charge time increases significantly
Solution Approach 1:
The patent applies partial charging strategy by limiting the SOC charge level to 80% for short-distance driving patterns. Instead of charging to the maximum 95% capacity, the system performs partial charging sufficient for the user's actual driving needs, thereby reducing charge time while providing adequate drivable distance for typical usage scenarios.
3Ease of operation
If the charging system automatically determines SOC range, then the ease of operation is improved, but the adaptability to different user needs is reduced
Solution Approach 1:
The patent implements feedback control by continuously monitoring driving distance and comparing it with the calculated average driving pattern. The system uses this feedback to automatically adjust the SOC charge limit, providing adaptive charging that responds to actual user behavior patterns while maintaining ease of operation through automatic determination.
Data Source
AI summary
An apparatus and method for charging a battery are provided. The apparatus includes a controller that is configured to select a driving mode based on a user operation. In addition, a BMS (Battery Management System) is configured to execute a charge type based on the selected driving mode and charge the battery.