EV Battery Performance Assessment via External Charging Resistance
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Solution Overview
Problem
Current methods for determining the performance of electric vehicle energy storage systems are inaccessible to independent third parties, requiring access to internal vehicle systems and being time-consuming, and do not account for environmental data, which is crucial for precise assessment.
Innovation Solution
A method that determines the performance of electric vehicle energy storage systems by using a charging device with direct current-carrying power channels to measure current, voltage, and resistance outside the vehicle, factoring out parasitic effects and using external physical variables and known information to isolate influences, allowing for quick and precise assessment without accessing internal systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement methods require access to internal vehicle systems (BMS, CPU) via dedicated communication buses, then measurement precision can be maintained, but accessibility to independent third parties is lost
Solution Approach 1:
The patent introduces a charging device as an intermediary that connects to the battery through power channels rather than internal communication buses. This mediator enables independent third-party access while maintaining measurement capability by using electrical parameters (current, voltage) that are naturally present during charging/discharging operations, eliminating the need for proprietary BMS interfaces
Solution Approach 2:
The patent replaces the electronic/communication-based measurement approach (requiring BMS/CPU access via communication buses) with an electrical/physical measurement approach. By measuring current, voltage, and temperature directly through power channels during normal battery operation, the system achieves measurement precision without needing internal vehicle system access
2Measurement precision
If complete charging data collection is required before determining battery health status, then measurement precision is improved, but productivity deteriorates due to time-consuming charging cycles
Solution Approach 1:
The patent applies partial action by collecting and utilizing charging data incrementally during the charging process rather than waiting for complete charging. The system can determine battery health status based on partial charging data (current, voltage, temperature measurements taken during charging), providing quick assessments without requiring the battery to be fully charged, thus maintaining productivity while achieving sufficient measurement precision
Solution Approach 2:
The charging device serves dual purposes: it both charges the battery and simultaneously performs health status determination. By utilizing the existing charging current and voltage during normal charging operations, the system eliminates the need for separate dedicated measurement cycles, thereby improving productivity without compromising measurement precision
3Device complexity
If environmental factors are excluded from measurement to simplify the system, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges environmental factor measurement (temperature, humidity) with the core battery performance measurement. The charging device integrates sensors that simultaneously monitor electrical parameters (current, voltage) and environmental conditions, processing them together to determine battery health status. This combination approach maintains measurement precision by accounting for environmental influences while avoiding the complexity of separate dedicated environmental monitoring systems
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 objective comparison of different energy storage systems, provides quick results without time-consuming charging cycles, and allows independent third parties to assess performance accurately, including considering environmental factors, thus enhancing precision and accessibility.
Implementation Method 1
Determining at least one current, in particular at least one amperage, of the vehicle energy storage system, determining at least one voltage of the vehicle energy storage system, determining at least one resistance of the vehicle energy storage system
Data Source
AI summary
The present invention relates to the field of electric vehicles, in particular to a method for determining the performance of an electric vehicle energy storage system. A method is provided that enables the performance of electrical energy storage devices to be determined from outside a vehicle without access to its internal communication and electronic systems. The method can be implemented with a charging device. The performance is related to the resistance and/or the energy absorption capacity of the electrical energy storage device. The resistance is determined via a variable charging or discharging current, whereby the variable current has a defined increase or decrease in a defined period of time and reaches a predetermined current intensity. The capacity is calculated either via the measured resistance using known relationships or relationships to be determined, e.g. using statistics or previous measurement, or via the determination by measuring duration, charging current and, advantageously, information about the voltage.