Battery Internal Resistance Calculation During Vehicle Driving
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Solution Overview
Problem
Existing methods for calculating the internal resistance of a battery cell are limited by the need to separate the battery from the vehicle, which restricts measurement to specific temporal and spatial conditions, making it difficult to accurately assess the resistance during actual driving conditions.
Innovation Solution
An apparatus and method for calculating internal resistance using a processor to collect current and voltage parameters while the vehicle is in a driving state, employing predefined data collection conditions to determine the resistance of a battery cell mounted on the vehicle, allowing for accurate measurement without separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery cell is separated from the vehicle for measurement using a charger/discharger, then the internal resistance can be measured with standardized equipment, but the measurement cannot be performed during actual driving conditions and requires battery removal
Solution Approach 1:
The battery management system performs internal resistance measurement using the vehicle's own power supply and control systems during normal driving operations, eliminating the need for external charger/discharger equipment. The controller utilizes existing battery discharge current and voltage data to calculate internal resistance, enabling the system to serve its own measurement needs without external intervention.
Solution Approach 2:
The vehicle's power supply system and control unit are designed to perform multiple functions: they both manage battery charging/discharging operations and conduct internal resistance measurements. The controller serves dual purposes by controlling power flow while simultaneously acquiring measurement data, making the measurement system universally applicable during various driving conditions without requiring dedicated measurement equipment.
2Ease of operation
If the battery cell is mounted on the vehicle, then the battery can be used in actual driving conditions, but the internal resistance cannot be measured without separating the battery
Solution Approach 1:
The controller acts as an intermediary that enables internal resistance measurement through the existing power supply system. Instead of requiring direct physical separation of the battery, the controller mediates the measurement process by collecting voltage and current data during normal operation and calculating internal resistance through processing, thus allowing measurement while the battery remains mounted and functional.
3Ease of manufacture
If a standardized charger/discharger method is used, then the measurement procedure is well-defined, but the measurement is limited to specific temporal and spatial conditions
Solution Approach 1:
The internal resistance measurement can be performed continuously during various driving conditions without requiring the battery to be removed or the vehicle to be stationary. The system continuously monitors battery parameters and performs measurements whenever sufficient discharge current is available, eliminating the temporal limitations of standardized charger/discharger methods and enabling ongoing battery health assessment throughout the vehicle's operational life.
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 accurate calculation of battery cell resistance during driving conditions, improving the prediction and management of battery lifespan by compensating for measurement errors through interpolation methods.
Implementation Method 1
the internal resistance of a battery cell is calculated based on an amount of voltage drop measured in a process of discharging a step current through a charger/discharger
Data Source
AI summary
The present disclosure relates to an apparatus and method for calculating an internal resistance of a battery, and a non-transitory computer-readable medium. Some embodiments provide a topology capable of measuring an internal resistance of a battery cell even when the battery is mounted on a vehicle without the separation or removal of the battery from the vehicle. Some embodiments of the present disclosure provide a configuration for calculating an internal resistance of a battery based on a current parameter and a voltage parameter of the battery when a data collection condition is satisfied, the data collection condition being predefined based on the discharge current characteristics of the battery while a vehicle is in a driving state.