Dynamic EV Battery Charging Scheme for Degradation Control
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Solution Overview
Problem
Electric vehicle batteries face challenges such as high capital costs, degradation over time, and variability in performance due to usage and environmental conditions, necessitating an effective and efficient charging method that optimizes battery life and reduces costs.
Innovation Solution
A system and method for intelligent battery charging that analyzes historical usage metrics and environmental conditions to determine a target state of charge, implementing a charging scheme with varying charge rates over time to minimize battery degradation and costs, using a combination of power-input circuitry, charging circuitry, and computer processing to control the charging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If charging is delayed to reduce battery degradation, then battery life is extended, but charging time increases
Solution Approach 1:
The charging rate is dynamically adjusted based on the battery's state of charge. The system transitions from a first charging rate to a second charging rate as the battery approaches the target state of charge, optimizing both battery life extension and charging time management
Solution Approach 2:
The system changes the charging parameter (charging rate) as a function of the battery's state of charge. By monitoring SOC and adjusting the charging rate accordingly, the system achieves delayed charging to reduce degradation while managing overall charging time
2Productivity
If high charging rates are used to reduce charging time, then charging speed increases, but battery degradation accelerates
Solution Approach 1:
The charging rate is dynamically adjusted based on the battery's state of charge. The system transitions from a first charging rate to a second charging rate as the battery approaches the target state of charge, optimizing both battery life extension and charging time management
Solution Approach 2:
The system applies a higher charging rate only for a portion of the charging process (when SOC is below the target threshold) and switches to a lower charging rate when approaching the target SOC. This partial application of high charging rate achieves faster charging without causing excessive degradation
Data Source
AI summary
Approaches for charging a battery for an electric vehicle involve obtaining battery usage metrics of the battery of the electric vehicle based upon past usage of the battery and past charging of the battery. The metrics are analyzed to determine a target state of charge (SOC) for a first type of vehicle usage and determine a charging scheme as a function of time to achieve the target SOC at a first predetermined time. The charging scheme includes a first time period and a subsequent second time period, wherein an average rate of delivering charge to the battery during the second time period is greater than an average rate of delivering charge to the battery during the first time period. The battery is charged according to the charging scheme until the battery reaches the target SOC, which is less than a maximum state of charge for the battery.