Battery Detection Device Using Impedance Variation for Deformation Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery deformation detection methods using hardware or firmware face challenges such as low precision, difficulty in calibration, high cost, and increased assembling tolerance, and are unable to effectively detect deformation in battery cells independently of the system.
Innovation Solution
A battery detection device with a detection circuit and protection circuit that utilizes a first resistor with varying impedance to detect deformation, producing a voltage variation which triggers the protection circuit to control the battery's operation state, eliminating the need for preset thresholds and improving precision and ease of calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure detector is used to detect battery deformation, then the battery deformation can be detected, but the precision is poor and the preset threshold is difficult to set
Solution Approach 1:
The patent replaces the mechanical pressure detector with an electrical measurement system using a voltage divider circuit. The deformation detection is achieved through measuring voltage changes caused by resistance variations in the detection resistor, eliminating the need for mechanical pressure sensors and complex threshold settings. The circuit naturally compares the detection voltage against a reference voltage to determine deformation state.
2Measurement precision
If a capacitance pressure detector is used to detect battery deformation, then the battery deformation can be detected, but the calibration is difficult and the cost increases
Solution Approach 1:
The patent uses simple, inexpensive resistive components instead of complex capacitance pressure detectors. The detection resistor and reference resistor are basic electronic components that are cheap, easy to manufacture, and do not require calibration. This substitution dramatically reduces both the cost and manufacturing complexity while maintaining effective deformation detection capability.
3Measurement precision
If a pressure detector is used to detect battery deformation, then the deformation can be detected, but the temperature variation affects the detection accuracy
Solution Approach 1:
The patent introduces a reference resistor as an intermediary element that compensates for temperature effects. The reference resistor experiences the same temperature variations as the detection resistor, and its voltage change is used as a reference in the voltage divider circuit. This differential measurement approach cancels out temperature-induced resistance changes, allowing accurate deformation detection across varying temperature conditions.
4Measurement precision
If the battery deformation detection is integrated with the system, then the detection can be performed, but the battery cannot achieve detection and protection in the state of only battery cells
Solution Approach 1:
The patent extracts the deformation detection function from the system-level implementation and integrates it directly into the battery cell structure. The detection resistor is incorporated within the battery packaging, allowing the battery to perform self-detection of its own deformation state. This enables the battery to independently monitor its condition and trigger protection mechanisms without requiring external system intervention.
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 device enhances precision, simplifies calibration, reduces costs, and decreases assembling tolerance, effectively controlling the battery's operation based on deformation, while maintaining functionality across varying temperature conditions.
Implementation Method 1
produces a first impedance value variation quantity according to a deformation of the battery
Implementation Method 2
A voltage variation quantity is produced between the second connection node and the fourth connection node at least according to the first impedance value variation quantity
Data Source
AI summary
The present disclosure provides a battery detection device. The detection circuit is disposed on the battery and produces an impedance value variation quantity according to a deformation of the battery. The detection circuit includes four connection nodes. The first connection node and the third connection node are connected with the battery. A voltage variation quantity is produced between the second connection node and the fourth connection node according to the impedance value variation quantity. The protection circuit is connected with the second connection node and the fourth connection node. The protection circuit is in an ON state when the voltage variation quantity is greater than or equal to a cut-off voltage. The protection circuit is in an OFF state when the voltage variation quantity is less than the cut-off voltage, so that an operation state of the battery is changed accordingly.