Variable Resistance Battery Insulation Measurement Across Wide Ranges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional insulation resistance measurement methods in high voltage battery systems suffer from low accuracy due to limited measurement ranges, leading to inaccurate calculations when the actual insulation resistance exceeds pre-designed values.
Innovation Solution
An insulation resistance measurement apparatus with variably controllable resistance units connected between the battery cathode and ground, and anode and ground, along with a voltage measurement unit and insulation resistance calculation unit, which switches between different resistance modes to calculate insulation resistance values within error ranges corresponding to actual values, ensuring accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed distribution resistance value is used in insulation resistance measurement, then the measurement system is simple and easy to operate, but the measurement accuracy deteriorates when the actual insulation resistance exceeds the designed distribution resistance value
Solution Approach 1:
The patent applies the dynamics principle by making the distribution resistance values variable rather than fixed. The measurement apparatus includes multiple distribution resistance units with different resistance values that can be dynamically switched based on the measurement requirements. This allows the system to adapt to different insulation resistance ranges, maintaining high measurement accuracy whether the actual insulation resistance is low or high, while still keeping the operation relatively simple through automated switching.
2Adaptability or versatility
If the distribution resistance value is increased to measure higher insulation resistance values, then the measurement range is extended, but the measurement accuracy for lower insulation resistance values deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the measurement system into multiple distribution resistance units with different resistance values (e.g., first distribution resistance unit with lower resistance, second distribution resistance unit with higher resistance). Each unit is optimized for specific measurement ranges. The system segments the overall measurement task into multiple sub-tasks, each handled by the appropriate resistance unit, thereby achieving both extended measurement range and maintained accuracy within each segment's optimal range.
Solution Approach 2:
The patent applies parameter changes by varying the distribution resistance values based on the measurement requirements. The system includes multiple distribution resistance units with different resistance parameters (e.g., 500kΩ, 1MΩ, 2MΩ) that can be selected and switched according to the expected insulation resistance level. This dynamic parameter adjustment allows the system to maintain optimal measurement accuracy across a wide range of insulation resistance values.
3Measurement precision
If multiple distribution resistance units with different values are used, then the measurement accuracy across different ranges is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the measurement apparatus to perform multiple measurement functions using a unified structure. The multiple distribution resistance units and switching mechanism work together as an integrated system that can automatically adapt to different measurement scenarios. This multi-functional design allows a single apparatus to accurately measure both low and high insulation resistance values without requiring separate measurement systems, thereby managing complexity through functional integration.
Solution Approach 2:
The patent applies self-service through automated switching control. The measurement apparatus includes control logic that automatically selects the appropriate distribution resistance unit based on the measurement requirements, eliminating the need for manual intervention. The system self-adjusts its configuration to optimize measurement accuracy for the current measurement task, reducing operational complexity while maintaining high precision across different measurement ranges.
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 prevents measurement accuracy from being lowered by calculating insulation resistance within error ranges corresponding to actual values, resulting in more accurate insulation resistance measurements for battery systems.
Implementation Method 1
a first resistance unit having a first end connected to a cathode of a battery and a second end connected to a ground, wherein the first resistance unit is variably controllable between having a first resistance value or a second resistance value greater than the first resistance value
Data Source
AI summary
An insulation resistance measurement apparatus includes a first resistance unit having one end connected to an anode of a battery and the other end connected ground, and variably having a first resistance value or a second resistance value greater than the first resistance value; a second resistance unit having one end connected to a cathode of the battery and the other end connected to ground, and variably having a third resistance value or a fourth resistance value greater than the third resistance value; a voltage measurement unit configured to measure a voltage across the first or second resistance unit; and an insulation resistance calculation unit configured to calculate a first insulation resistance value between the anode of the battery and ground and a second insulation resistance value between the cathode of the battery and ground by using the first to fourth resistance values and the measured voltage.