EV Charge Termination Control With Adaptive CV-CC Pair Selection
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Solution Overview
Problem
Existing electric vehicle charging systems lack the ability to dynamically adjust terminal clamp voltage (CV) and cutoff current (CC) combination pairs in real-time based on the charging capabilities of both the offboard charging station and the onboard charging circuit, which can lead to suboptimal charging times and battery life.
Innovation Solution
The proposed charging system includes a memory to store CV and CC combination pairs, a charging receptacle for connecting to an offboard charging station, and an onboard charging circuit with a control module. This control module communicates with the offboard charging station, determines the charging capabilities, and selects the optimal CV and CC combination pair to initiate charging, taking into account factors such as charge power, battery life expectancy, and charge termination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed CV and CC combination pair is used for charging, then the charging system is simple to operate, but the charging time is suboptimal and battery life is reduced
Solution Approach 1:
The patent implements dynamic selection of CV and CC combination pairs based on real-time charging capabilities of both the offboard charging station and onboard charging circuit. The control module continuously monitors charging conditions and adjusts the selected CV-CC pair from a pre-stored set of combinations, enabling adaptive optimization of charging time without requiring complex real-time calculations or adjustments during charging.
Solution Approach 2:
The system pre-stores multiple CV and CC combination pairs in memory before charging begins. This preliminary preparation allows the control module to quickly select an appropriate combination based on detected charging capabilities, avoiding the need for complex real-time optimization algorithms during the actual charging process and reducing computational complexity.
2Productivity
If high charging power is used, then charging time is reduced, but battery life expectancy is shortened
Solution Approach 1:
The patent utilizes a pre-stored set of CV and CC combination pairs with varying parameter values. The control module selects specific parameter combinations based on the detected charging capabilities and charging requirements, enabling flexible adjustment between charging speed and battery life protection without requiring complex real-time parameter optimization algorithms.
3Measurement precision
If the CV and CC combination is not optimized, then the charging control is simple, but charge termination accuracy is poor
Solution Approach 1:
The system pre-calculates and stores multiple CV and CC combination pairs that correspond to different charge termination scenarios. This preliminary preparation of optimized parameter sets enables accurate charge termination detection without requiring complex real-time calculations, maintaining simple control logic while achieving high measurement precision for charge termination accuracy.
Data Source
AI summary
A charging system for an electric vehicle includes: a memory configured to store terminal clamp voltage (CV) and a cutoff current (CC) combination pairs; a charging receptacle configured to connect to an offboard charging station; and an onboard charging circuit. The onboard charging circuit includes: a high-voltage direct current bus connected to a rechargeable energy storage system; and a control module configured to communicate with the offboard charging station and determine charging capabilities of the offboard charging station and the onboard charging circuit, to select one of the CV and CC combination pairs based on the charging capabilities of the offboard charging station and the onboard charging circuit, and to initiate charging of the rechargeable energy storage system based on the selected one of the CV and CC combination pairs.