Battery Temperature Detection Using Resonant Circuit Multiplexing
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Solution Overview
Problem
Conventional temperature detecting apparatuses for assembled batteries face challenges in achieving high-resolution temperature measurement while maintaining good cabling workability, as they often require a large number of temperature sensors, leading to complex cabling and reduced workability due to insufficient sensor resolution and increased detection lines.
Innovation Solution
A temperature detecting apparatus with a plurality of detecting circuits, each comprising a temperature-sensitive resistor, coil, and capacitor connected in series, where the inductance and capacitance are set to produce unique resonance frequencies, allowing a single pair of detection lines to be used across all circuits, and a processing part outputs a sine-wave signal to match each circuit's frequency for precise temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of temperature sensors is increased to improve temperature detection resolution, then the measurement precision is improved, but the device complexity and cabling workability deteriorate due to the proportional increase in detection lines
Solution Approach 1:
Multiple temperature detection circuits share a common pair of detection lines (two wires) for electrical connection to the control unit. This merging approach allows N temperature sensors to be connected using only 2 wires instead of 2N wires, significantly reducing cabling complexity while maintaining the ability to detect temperatures at multiple locations with high resolution
Solution Approach 2:
The detection circuits are designed with universal characteristics where each circuit can independently measure temperature while all circuits share the same communication infrastructure (detection lines). The control unit can selectively activate and read from any of the N detection circuits through the shared lines, enabling multi-functionality in temperature monitoring across different battery cell locations
2Measurement precision
If the number of temperature sensors is increased to improve temperature detection resolution, then the measurement precision is improved, but the ease of manufacture deteriorates due to complicated cabling work
Solution Approach 1:
The patent merges multiple detection circuits into a single wired interface by having all N temperature sensors share one pair of detection lines. This consolidation transforms what would be N separate wiring tasks into a single standardized connection process, dramatically improving ease of manufacture and installation while preserving high-resolution temperature detection capabilities across multiple battery cells
3Measurement precision
If more detection lines are used to connect more temperature sensors, then the measurement precision is improved, but the loss of space in the limited case interior increases
Solution Approach 1:
The detection circuits are merged to share a common communication bus (two wires), reducing the total wire count from what would be required for individual connections. This space-efficient approach allows multiple temperature sensors to be monitored without proportionally increasing cable volume, preserving valuable space within the battery pack enclosure
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 enables high-resolution temperature detection for each cell in an assembled battery with improved cabling workability by using shared detection lines, reducing the complexity of cabling and enhancing the accuracy of temperature management.
Implementation Method 1
each of the plurality of the detecting circuits includes a circuit in which a temperature-sensitive resistor whose electrical characteristic changes responding to a temperature
Implementation Method 2
an inductance of the coil and a capacitance of the capacitor in each of the plurality of the detecting circuits are set so that a resonance frequency of each of the plurality of the detecting circuits is a different value from each other
Data Source
AI summary
A temperature detecting apparatus which detects a temperature of an assembled battery in which a plurality of cells are assembled, the temperature detecting apparatus includes a plurality of detecting circuits which respectively correspond to the plurality of the cells, a pair of detection lines which electrically connects the plurality of the detecting circuits in parallel, and a processing part which outputs a sine-wave detection signal to the pair of the detection lines through a voltage-dividing resistor so as to detect a temperature of each of the plurality of the cells. Each of the plurality of the detecting circuits includes a circuit in which a temperature-sensitive resistor whose electrical characteristic changes responding to a temperature, a coil and a capacitor are connected in series.