EV Charging Control Using Predicted Minimum SOC Targets
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Solution Overview
Problem
Existing battery charging control systems for electric vehicles do not effectively balance the need to minimize battery deterioration with the inconvenience of frequent charging, as they either overcharge the battery or require charging after every use.
Innovation Solution
A charging control apparatus that calculates a minimum State of Charge (SOC) needed for the next drive instance based on the vehicle's drive history and sets a target charging amount that suppresses battery deterioration while ensuring the SOC is maintained within necessary limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery is charged to push back the next scheduled charging day, then the charging frequency is reduced, but the battery SOC remains in the high SOC region for several days causing accelerated deterioration
Solution Approach 1:
The patent dynamically adjusts the target SOC parameter based on predicted drive patterns and battery health requirements. Instead of maintaining a fixed high SOC to reduce charging frequency, the system varies the target SOC level to balance between reducing charging frequency and preventing excessive deterioration from prolonged high SOC exposure
Solution Approach 2:
The system performs preliminary prediction of drive patterns and battery state before setting the charging target. By analyzing historical drive data and predicting future usage, the system determines the optimal target SOC in advance, ensuring that charging reduces frequency without causing harmful prolonged high SOC exposure
2Reliability
If the battery is charged according to the next trip requirement, then the minimum SOC is maintained, but charging is required every time the electric automobile is used increasing user burden
Solution Approach 1:
The system performs preliminary analysis of drive patterns and battery state to predict future charging needs. By predicting when charging will be necessary based on historical data and usage patterns, the system allows the battery to operate without charging for multiple cycles when conditions permit, reducing the frequency of charging operations while ensuring reliability when needed
Solution Approach 2:
The system autonomously determines charging timing and target SOC levels based on predicted usage patterns without requiring user intervention. The charging control apparatus independently analyzes drive history, predicts future needs, and sets appropriate charging targets, eliminating the need for users to manually monitor and charge the battery after every use
Data Source
AI summary
With a charging control apparatus, first, a chargeable amount is acquired. Then, the charging control apparatus calculates a minimum SOC that is the lowest SOC needed by the vehicle for the following travel. Then, the charging control apparatus sets a target SOC that restricts deterioration of the battery and is greater than or equal to the minimum SOC. Alternatively, the charging control apparatus sets a target charging amount that restricts deterioration of the battery and is less than or equal to the chargeable amount.