Battery Voltage Detection Error Correction via Filter Timing
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Solution Overview
Problem
The existing voltage detection apparatuses for battery cells suffer from reduced accuracy due to the influence of filter circuits, which introduce errors in voltage detection.
Innovation Solution
The apparatus includes discharge circuits with switch elements and resistors connected in series, filter circuits to remove noise, and voltage detection units that correct detection results based on the time from when the switch elements change to the OFF state, utilizing a low-pass filter circuit with a resistor and capacitor to adjust for voltage errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filter circuits are provided between battery cells and voltage detection circuits to remove noise, then noise removal capability is improved, but voltage detection accuracy deteriorates due to errors introduced by the filter circuit
Solution Approach 1:
The system measures the actual voltage after filtering and compares it with the expected voltage to calculate a correction value. This correction value is then applied to compensate for the filter circuit's influence, creating a feedback loop that eliminates the measurement error while preserving the noise-filtering benefit
Solution Approach 2:
The system changes the parameter being measured by detecting the voltage at a specific time point after the discharge circuit is deactivated. By timing the measurement to occur after the discharge circuit turns OFF, the system captures the voltage when the filter circuit's influence is minimized, thereby improving detection accuracy
2Speed
If voltage detection is performed immediately after discharge circuit operation, then response speed is improved, but detection accuracy deteriorates due to residual effects from the discharge circuit and filter circuit interaction
Solution Approach 1:
The system performs a preliminary action by deactivating the discharge circuit before voltage detection. This preliminary deactivation removes the discharge circuit's influence on the voltage measurement, allowing for more accurate detection without significantly delaying the overall response time
Solution Approach 2:
The system maintains continuous voltage monitoring by rapidly switching between discharge circuit control and voltage detection modes. The detection operation continues seamlessly after discharge circuit deactivation, ensuring that the useful action of voltage monitoring remains continuous while improving accuracy
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 effectively corrects detection errors caused by filter circuits, thereby enhancing the accuracy of voltage detection in battery cells.
Implementation Method 1
filter circuits which are provided for the respective battery cells and remove the noise contained in the voltage inputted by the battery cells
Implementation Method 2
the filter circuit is a low-pass filter circuit constituted by a resistor and a capacitor
Data Source
AI summary
A voltage detection apparatus comprises discharge circuits constituted by switch elements and resistors connected in series, and respectively connected in parallel to each of a plurality of battery cells constituting a storage battery, filter circuits provided for the respective battery cells and removing noise contained in voltage inputted by the battery cells, and voltage detection units (D) and (M) which detect voltage of the respective battery cells in which noise is removed by the filter circuits. The voltage detection units correct detection results, based on time from when the switch elements of the discharge circuits change into an OFF state to timing for detecting voltage of the battery cells. With this voltage detection apparatus, it is possible to correct the detection error of the voltage of the battery cell due to the influence of the filter circuit, thus improving the detection accuracy of the voltage of the battery cell.