Battery Insulation Resistance Measurement with Split HV-LV Sensing
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Solution Overview
Problem
Existing insulation resistance measurement systems for electric vehicle batteries require multiple devices for high-precision measurements, increasing cost and compromising insulation performance between high and low voltage sides.
Innovation Solution
A single apparatus measures insulation resistance by using a voltage measurement resistor connected to the negative terminal of the battery, with a control unit calculating insulation resistance values based on switch configurations, reducing the need for separate high-precision devices and ensuring better insulation performance by separating sensing substrates into high and low voltage sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple high-precision measuring devices are used for insulation resistance measurement, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple measurement functions into a single measuring device. The apparatus integrates high-voltage and low-voltage potential measurements, insulation resistance measurement, and ground potential measurement capabilities into one unified device, eliminating the need for multiple separate high-precision measuring devices while maintaining measurement accuracy
Solution Approach 2:
The measuring device is designed with universal functionality to perform multiple measurement tasks. It can measure both high-voltage and low-voltage potentials, calculate insulation resistance, and monitor ground potentials using a single apparatus, thereby reducing device complexity and manufacturing cost while preserving measurement precision
2Reliability
If sensing substrates are separated into high voltage and low voltage sides, then insulation performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the sensing substrate into distinct high-voltage and low-voltage regions with proper isolation. The sensing substrate includes separate measurement circuits for high-voltage potentials and low-voltage potentials, with galvanic isolation between the two sides to prevent interference and ensure insulation performance while maintaining a unified device structure
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
This approach reduces manufacturing costs by using a single device for high-precision measurements and enhances insulation performance by utilizing different ground potentials on separate sensing substrates, ensuring safe and efficient battery operation.
Implementation Method 1
a resistance unit including a voltage measurement resistor configured to divide and measure a voltage of the battery
Data Source
AI summary
The present invention relates to an apparatus capable of measuring an insulation resistance of a battery, and according to the apparatus capable of measuring the insulation resistance of the present invention. A voltage measurement unit may measure a voltage with respect to a potential of a negative terminal of a battery rather than the ground, and thus parameters requiring a high precision may be measured using one device, thereby reducing cost, and, because a first sensing substrate and a second sensing substrate are separated, different potentials may be used as the ground, thereby securing a better insulation performance between the first sensing substrate that is an HV side and the second sensing substrate that is an LV side.