Battery Voltage Detection Circuit with Current Cancellation
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Solution Overview
Problem
Existing battery monitoring systems struggle to accurately detect voltages of battery cells when there are variations in battery voltages due to the effect of noise removal filters connected between the battery cell group and voltage detection circuits.
Innovation Solution
A semiconductor device with voltage detection circuits and a regulation mechanism that uses resistor elements and capacitor elements to cancel out currents flowing through resistor elements, ensuring accurate voltage detection across battery cells regardless of voltage variations, by connecting lines via resistor elements between neighboring battery cells and incorporating a noise removal portion with resistor and capacitor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a noise removal filter is connected between the battery cell group and voltage detection circuits, then noise is removed from the voltage detection, but voltage detection accuracy deteriorates when battery voltages vary
Solution Approach 1:
The patent applies local quality by making the resistance values of resistors R1 unequal for different battery cells. Specifically, resistors connected to battery cells with different voltage characteristics have different resistance values, allowing each detection channel to be optimized for its specific operating conditions. This resolves the contradiction by enabling accurate voltage detection across varying battery voltages while maintaining noise filtering capability.
Solution Approach 2:
The patent changes the resistance parameters of the resistors in the noise removal filter to resolve the contradiction. By setting different resistance values for resistors R1 corresponding to different battery cells, the system adapts to varying voltage conditions. This parameter adjustment allows the noise filter to maintain effectiveness across different voltage states while preserving detection accuracy.
2Measurement precision
If resistance value of resistor R2 is reduced to moderate voltage drop effects, then voltage detection accuracy improves, but current imbalance increases
Solution Approach 1:
The patent applies local quality by making resistance values of resistors R1 unequal for different battery cells. This localized differentiation compensates for voltage variations across the battery pack, allowing accurate detection without requiring uniform low resistance values that would cause current imbalance. Each resistor value is tailored to its specific battery cell's characteristics.
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 detection of battery voltages across battery cells, even when voltages are inconsistent, by regulating currents and minimizing voltage drops across resistors, thus improving the reliability of voltage monitoring systems.
Implementation Method 1
The noise removal filter 14 is a low-pass filter (LPF) constituted by an RC circuit.
Implementation Method 2
a voltage drop across the resistor R2, and there may be a difference between the battery voltage of the highest potential battery cell C3 and the input voltage V of the voltage detection circuit 200 thereof
Data Source
AI summary
A semiconductor device including: lines connected to lines between respective neighboring battery cells of plural battery cells connected in series; at each of the battery cells, a voltage detection portion that detects a battery voltage value of the battery cell based on a voltage provided by the lines connected to the high potential side of the battery cell and to the low potential side of the battery cell; and at each of the lines, a regulation portion that regulates current to make a first current and a second current cancel out, the first current being caused to flow in a first direction in the resistor element by the battery cell at the high potential side of the line, and the second current being caused to flow in a second direction in the resistor element by the battery cell at the low potential side of the line.