CN110873630A - Electrolyte leakage detection method and device based on continuous change of dielectric constant - Google Patents
Electrolyte leakage detection method and device based on continuous change of dielectric constant Download PDFInfo
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- CN110873630A CN110873630A CN201811016026.XA CN201811016026A CN110873630A CN 110873630 A CN110873630 A CN 110873630A CN 201811016026 A CN201811016026 A CN 201811016026A CN 110873630 A CN110873630 A CN 110873630A
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- electrolyte
- battery
- leakage
- dielectric constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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Abstract
The invention relates to a battery electrolyte leakage detection method and device based on continuous change of dielectric constant, which are used for monitoring the battery leakage condition in a battery box, and the method for measuring the electrolyte by the device comprises the following steps: when volatile gas in the electrolyte contacts the capacitive sensor after the battery leaks, the dielectric constant of the electrolyte is different from the initial value of the sensor, so that the capacitance value of the capacitive sensor changes according to the concentration value of the electrolyte, and the device converts the capacitance change based on the capacitive sensor into PWM wave detection by using a Venturi bridge circuit, thereby improving the detection precision and sensitivity of the electrolyte concentration.
Description
Technical Field
The invention belongs to the field of fire alarm of new energy batteries, and relates to battery leakage detection.
Background
With the rapid development of new energy automobiles, the safety of the battery is increasingly embodied, wherein the detection of the leakage of the battery electrolyte gradually becomes a key. The battery leakage detection method has the advantages of good sensitivity and high reliability, and is very suitable for the field of new energy automobiles.
Disclosure of Invention
The invention aims to provide a quick and reliable detection mode aiming at the early warning of the leakage of the power battery, and the early warning of the leakage of the battery is carried out.
Based on the application that EC and PC concentration influence capacitance value change in the electrolyte, take place to leak and adopt the capacitance value sample to measure to electrolyte on the battery box.
The capacitance module is combined, a Venturi bridge oscillator formed by integrating operational amplifiers is used for forming a waveform of the output frequency change of the RC oscillator, the output waveform is shaped into a PWM wave through a hysteresis comparator formed by the operational amplifiers, and the main chip MCU judges the change of C by collecting the output frequency change of the PWM wave, so that the change of epsilon is judged.
According to the Venturi bridge sampling schematic diagram, a capacitance module PCB (1) is provided with double capacitors (2), and a PCB wiring capacitor (3).
The electrolyte leakage detection method has the advantages that: 1. the design is reasonable, the detection sensitivity is high, and the reliability is good; 2. the method is suitable for mass production, and the production efficiency is high; 3. good stability and long service life.
Drawings
FIG. 1 is a Venturi bridge sampling schematic.
Fig. 2 is a circuit board diagram of a capacitive module.
Detailed Description
The capacitor module is combined with the Venturi bridge oscillation output frequency formed by the integrated operational amplifier, PWM wave collection is carried out by combining with the MCU, the change of the collection frequency and the sampling period (50ms) are found in real time, and then whether the electrolyte leaks or not is judged. The Wen electric bridge combines the PWM collection of MCU, and it is stable to have the oscillation, and the wave form is good, and the oscillation frequency is adjusted in the broad scope in succession moreover, and MCU adopts 40M dominant frequency, and sampling frequency is high, and the precision is high, and the error control is within 1%.
The device provided by the invention comprises a high-precision temperature and humidity sensor, can monitor the temperature and humidity in the battery box in real time, and provides an environmental basis for collecting the concentration of the electrolyte. Particularly, humidity is easily introduced in the installation process, the measurement of the leakage capacitance value of the electrolyte can be influenced, preventive measures are taken in advance, and therefore the alarm can be accurately and quickly given out when dangerous cases really occur.
The calibration of the threshold value on the software introduces a reasonable threshold value for the electrolyte leakage alarm judgment, the threshold values of battery boxes with different styles can be different due to different spaces, and the calibration of the threshold value makes the early warning of the electrolyte leakage more sensitive and more accurate.
The specific embodiments described herein are merely illustrative of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms capacitive module PCB board (1), dual capacitor (2), trace capacitor (3), etc. are used more herein, the possibility of using other terms is not excluded.
Claims (4)
1. The invention relates to a battery electrolyte leakage detection method and device based on continuous change of dielectric constant, which is characterized in that the electrolyte leakage detection device comprises one group or a plurality of groups of Venturi bridge circuits formed by capacitance modules for collecting electrolyte concentration, as the leaked electrolyte is diffused to the surface of a capacitor to influence the dielectric constant of the capacitor, the electrolyte detection device generates PWM waves with different frequencies according to the change of the dielectric constant, and a main chip analyzes the battery leakage condition in a battery box by sampling the Venturi bridge PWM waves.
2. The method and device for detecting the electrolyte leakage of the battery according to claim 1, wherein the capacitor module for collecting the electrolyte concentration adopts a PCB as a module main body.
3. The method and device for detecting the leakage of the battery electrolyte according to claim 1, wherein the capacitance module for collecting the concentration of the electrolyte adopts a double capacitor and is arranged on a PCB.
4. The method and device for detecting the leakage of the battery electrolyte according to claim 1, wherein the capacitance module for collecting the concentration of the electrolyte adopts a PCB (printed Circuit Board) wiring capacitor, and a capacitor is formed between lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811016026.XA CN110873630A (en) | 2018-09-01 | 2018-09-01 | Electrolyte leakage detection method and device based on continuous change of dielectric constant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811016026.XA CN110873630A (en) | 2018-09-01 | 2018-09-01 | Electrolyte leakage detection method and device based on continuous change of dielectric constant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110873630A true CN110873630A (en) | 2020-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811016026.XA Pending CN110873630A (en) | 2018-09-01 | 2018-09-01 | Electrolyte leakage detection method and device based on continuous change of dielectric constant |
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| CN (1) | CN110873630A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463510A (en) * | 2020-04-14 | 2020-07-28 | 上海豫源电力科技有限公司 | Soft package battery module and manufacturing method thereof |
| WO2023061321A1 (en) * | 2021-10-15 | 2023-04-20 | 华为技术有限公司 | Liquid leakage detection apparatus and power supply |
| CN117346962A (en) * | 2023-12-05 | 2024-01-05 | 杭州华塑科技股份有限公司 | Battery leakage detection method and device, electronic equipment and storage medium |
-
2018
- 2018-09-01 CN CN201811016026.XA patent/CN110873630A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463510A (en) * | 2020-04-14 | 2020-07-28 | 上海豫源电力科技有限公司 | Soft package battery module and manufacturing method thereof |
| WO2023061321A1 (en) * | 2021-10-15 | 2023-04-20 | 华为技术有限公司 | Liquid leakage detection apparatus and power supply |
| CN117346962A (en) * | 2023-12-05 | 2024-01-05 | 杭州华塑科技股份有限公司 | Battery leakage detection method and device, electronic equipment and storage medium |
| CN117346962B (en) * | 2023-12-05 | 2024-03-12 | 杭州华塑科技股份有限公司 | Battery leakage detection method and device, electronic equipment and storage medium |
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