External EV Battery Assessment Using Variable Charge Current
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Solution Overview
Problem
Current methods for assessing the performance of electric vehicle energy storage devices are limited, as they require access to internal vehicle systems and are not accessible to independent third parties, and they are time-consuming, focusing on full charge cycles without considering environmental data.
Innovation Solution
A method that determines the performance of electric vehicle energy storage devices externally, using a charging device with two current-carrying power channels to measure current and voltage, and applies a time-variable current increase or decrease to calculate resistance, accounting for parasitic effects and environmental influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods use internal vehicle systems (BMS, CPU) to determine battery performance, then measurement precision is improved, but accessibility to independent third parties deteriorates
Solution Approach 1:
The patent introduces an intermediary assessment system that can operate independently of the vehicle's internal BMS and CPU systems. This intermediary system uses external measurements and calculations to determine battery performance, allowing independent third parties to assess battery health without requiring access to proprietary internal vehicle systems while maintaining measurement accuracy through alternative measurement approaches
2Measurement precision
If current methods perform full charge cycles to assess battery performance, then measurement precision is improved, but loss of time deteriorates
Solution Approach 1:
The patent applies partial action by performing only the necessary portion of a full charge cycle assessment. Instead of requiring complete charge-discharge cycles, the system uses selective measurements during charging processes combined with algorithmic models to determine battery performance, significantly reducing the time required while maintaining adequate measurement precision for practical purposes
3Device complexity
If current methods ignore environmental data during battery assessment, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent incorporates environmental parameters (temperature, humidity, etc.) as additional variables in the battery performance assessment model. By integrating these environmental data points into the algorithmic model, the system compensates for environmental influences on battery behavior, thereby improving measurement precision without requiring complex additional hardware, as the environmental factors are processed through software-based corrections
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick, precise, and accurate assessment of energy storage device performance, allowing for objective comparison and independent evaluation by third parties without accessing internal vehicle systems, and considers environmental factors for improved accuracy.
Implementation Method 1
Determining at least one resistance of the vehicle energy storage device... to determine the performance, in particular the resistance, of the vehicle energy storage device, a time-variable current increase or current decrease is used
Data Source
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AI summary
The present invention relates to the field of electric vehicles, in particular to a method for determining the performance capability of an electrical vehicle energy store. A method is provided that allows the performance capability of electrical energy stores to be ascertained from outside a vehicle without accessing its internal communication and electronics systems. The method may be implemented using a charging device. The performance capability is related to the resistance and/or the energy storage capacity of the electrical energy store. The resistance is ascertained using a variable charge or discharge current, the variable current having a defined rise or fall in a defined period and reaching a predefined amperage. The performance capability is calculated either using the measured resistance using known or ascertainable relationships, for example using statistics or prior measurement, or by analysis via the measurement period, charge current and advantageously information about the voltage.