Battery Insulation Resistance Circuit With Simplified PCB Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional apparatuses for estimating insulation resistance in high-voltage battery systems have complex configurations, leading to increased volume, calculation errors, and complications when implemented as printed circuit boards.
Innovation Solution
A simplified insulation resistance estimation circuit with a controller that calculates insulation resistance between battery electrodes and chassis ground using a network of resistors and switches, allowing for normal operation diagnosis and electrical disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional apparatus for estimating insulation resistance is implemented as a PCB, then the insulation resistance can be measured, but the volume is increased and calculation errors occur due to complex configuration
Solution Approach 1:
The insulation resistance measurement function is segmented into a dedicated independent circuit module with specific resistor components (R1, R2, R3) and switching elements. This segmentation isolates the measurement function from other system components, reducing overall system complexity while maintaining measurement accuracy through specialized circuit design.
Solution Approach 2:
The insulation resistance measurement circuit is extracted as a separate functional module with its own dedicated components and control logic. By taking out this measurement function from the integrated system, the patent reduces calculation complexity and potential error sources while preserving the essential measurement capability.
2Measurement precision
If a conventional apparatus for estimating insulation resistance is implemented as a PCB, then the insulation resistance can be measured, but the volume is increased
Solution Approach 1:
The insulation resistance measurement circuit is merged with the existing battery management system components, sharing common elements such as the controller and signal processing pathways. This merging eliminates redundant components and reduces the overall volume required for implementing insulation resistance measurement capability.
Solution Approach 2:
The measurement circuit is designed with universal components that can serve multiple functions within the battery management system. The same controller and sensing mechanisms are used for both insulation resistance measurement and other battery monitoring functions, reducing the volume footprint by avoiding dedicated separate systems.
3Measurement precision
If a conventional apparatus for estimating insulation resistance is implemented as a PCB, then the insulation resistance can be measured, but calculation errors occur
Solution Approach 1:
The circuit incorporates feedback mechanisms where the controller continuously monitors voltage signals from the measurement circuit and adjusts calculations accordingly. The switching elements provide feedback paths that enable verification of measurement validity, reducing calculation errors through real-time validation and correction.
Solution Approach 2:
The patent employs parameter changes in the resistor values and switching configurations to optimize the measurement range and accuracy for different insulation resistance conditions. By dynamically adjusting circuit parameters through switching, the system maintains high measurement accuracy across varying operational conditions while reducing calculation complexity.
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
The solution simplifies the circuit design, reduces volume and cost, and enhances accuracy by calculating insulation resistance values and diagnosing circuit operation effectively.
Implementation Method 1
a voltage sensor configured to measure a voltage of a second contact point between the second resistor and the third resistor
Implementation Method 2
a controller configured to: control respective states of the first switch and the second switch; and calculate the insulation resistance value based on (i) the voltage measured at the second contact point while the first switch and the second switch are in an ON state and (ii) the voltage measured at the second contact point while the first switch is in an OFF state and the second switch is in the ON state
Data Source
AI summary
An apparatus and battery system for estimating insulation resistance including an insulation resistance measurement circuit connected to a first electrode of a battery, a first switch connected to the first resistor, a second resistor connected to the first switch, a third resistor connected to the second resistor and a second electrode of the battery, and a second switch connected between a first contact point between the first switch and the second resistor and a chassis ground, a voltage measurement part measuring a voltage of a second contact point between the second resistor and the third resistor, and a controller controlling the first and second switches and calculating an insulation resistance value based on the voltage measured at the second contact point the first and second switches are ON, and the voltage measured at the second contact point while the first switch is OFF and the second switch is ON.