CN114563447A - Low-power detection method for gas chip of thermal runaway early warning sensor - Google Patents
Low-power detection method for gas chip of thermal runaway early warning sensor Download PDFInfo
- Publication number
- CN114563447A CN114563447A CN202011353709.1A CN202011353709A CN114563447A CN 114563447 A CN114563447 A CN 114563447A CN 202011353709 A CN202011353709 A CN 202011353709A CN 114563447 A CN114563447 A CN 114563447A
- Authority
- CN
- China
- Prior art keywords
- thermal runaway
- early warning
- warning sensor
- low
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to the technical field of thermal runaway of new energy automobile batteries, and discloses a low-power detection method for a thermal runaway early warning sensor gas chip, which comprises the following steps: (1) obtaining resistance value change rule parameters of the gas chip for different gas concentrations during low-power operation through experiments; (2) enabling a gas chip of the thermal runaway early warning sensor to be in low-power operation; (3) measuring to obtain a resistance value change rule of the gas chip, and comparing the resistance value change rule with a preset thermal runaway resistance value change rule; (4) when the measured resistance value rule is matched with the thermal runaway resistance value change rule, activating the thermal runaway early warning sensor to run at full power; (5) and when the thermal runaway early warning sensor operates at full power, determining whether the thermal runaway is an actual thermal runaway state, and awakening the BMS and feeding back information to the terminal when the actual thermal runaway is determined. According to the invention, the thermal runaway condition is preliminarily judged through the characteristics of the gas chip under low-power operation, and then full-power comprehensive judgment is carried out, so that the whole-process monitoring of the battery is ensured.
Description
Technical Field
The invention relates to the technical field of thermal runaway of new energy automobile batteries, in particular to a low-power detection method for a thermal runaway early warning sensor gas chip.
Background
After the new energy automobile is stopped, a BMS (battery management system) stops working, but the thermal runaway early warning sensor is required to be capable of continuously monitoring the condition in the battery pack after being electrified under high voltage. The working voltage used at the moment is provided by a small battery, and the large power consumption of the thermal runaway early warning sensor can cause burden to the low-voltage small battery, so that the vehicle cannot be started under the extreme condition. Therefore, the whole thermal runaway early warning sensor is required to work with low power consumption.
The working current of the pressure chip of the thermal runaway pre-sensor is less than 1mA, and the working current of the gas chip is 5-7 mA, so that full-performance work can be guaranteed. The gas chip needs to be heated to a certain temperature (about 300 ℃) to ensure that the volatile matter of the reducing organic gas generates oxidation reaction to cause the change of resistance and estimate the change of concentration, so that the corresponding temperature to be heated can be reached by a certain heating power.
To reduce the early warning operating power when parking, low power monitoring is typically implemented using software algorithms, such as:
after the voltage is reduced under the high voltage, the operation is continued for a certain time, which can be 2 hours, 24 hours and other similar strategies, and then the monitoring is stopped;
after the high-voltage is applied, the operation is carried out intermittently, and similar strategies such as starting for 5 minutes every 1 hour are adopted;
after the battery pack is powered down under high voltage, the function of the pressure chip is only turned on, when the pressure signal in the battery pack is abnormal, the gas chip is activated again, and the battery pack and the gas chip simultaneously monitor abnormal characteristics and then wake up the BMS to perform related alarm.
Regardless of the method, a false alarm condition may occur, resulting in an unexpected thermal runaway event.
Disclosure of Invention
The invention aims to solve the problems and provides a low-power detection method for a gas chip of a thermal runaway early warning sensor.
The technical scheme adopted by the invention is as follows:
a low-power detection method for a thermal runaway early warning sensor gas chip is characterized by comprising the following steps:
(1) obtaining resistance value change rule parameters of the gas chip for different gas concentrations during low-power operation through experiments;
(2) enabling a gas chip of the thermal runaway early warning sensor to be in low-power operation;
(3) measuring to obtain a resistance value change rule of the gas chip, and comparing the resistance value change rule with a preset thermal runaway resistance value change rule;
(4) when the measured resistance value law is matched with the thermal runaway resistance value change law, activating the thermal runaway early warning sensor to run at full power;
(5) when the thermal runaway early warning sensor runs at full power, whether the thermal runaway is in an actual thermal runaway state is determined, when the actual thermal runaway is determined, the BMS is awakened, information is fed back to the terminal,
the low power operation is where the gas chip is operating at power rating of 1/3 to 2/3.
Further, the low power value is 13mW to 35 mW.
Further, the working temperature of the thermal runaway early warning sensor is 180-220 ℃.
Further, the experimental method in the step (1) comprises the following small steps:
(1.1) arranging a thermal runaway early warning sensor in a test instrument, and setting a heating voltage;
(1.2) filling clean air into a test instrument, and calibrating the resistance value R0 of a gas chip of the thermal runaway early warning sensor after the test instrument is stabilized;
(1.3) dynamically filling thermal runaway gases with different concentrations into a test instrument, and recording the resistance value of the gas chip after being stabilized in the delta T time as Rs;
(1.4) calculating the time variation ratio of the resistance value of the gas chip under different gas concentrations: delta C/delta T, wherein delta C = (R0-Rs)/Rs R%, wherein R% is an efficiency value corresponding to different thermal runaway gases, and a gas chip resistance time change ratio is used as a resistance change rule parameter.
Further, the experiments of the steps (1.1) to (1.4) were carried out for different heating voltages between 0.9V and 1.8V, and the results were used as the resistance variation law parameters.
Further, in the step (1.4), the concentration of the different gases is 1000ppm to 5000 ppm.
Further, the thermal runaway gas is ethanol gas.
Further, the r% value in the step (1.4) is 90%.
Further, the temperature in the experiment was 25. + -. 2 ℃ and the humidity was (30. + -.3)% RH to (65. + -.3)% RH.
The invention has the beneficial effects that:
(1) the gas chip of the sensor works under low power, and the purpose of monitoring is achieved according to a low power characteristic rule;
(2) can keep the whole process working and can not generate the phenomenon of missing report.
Detailed Description
The following describes a specific embodiment of the low power detection method of the thermal runaway early warning sensor gas chip of the present invention in detail.
The basic principle of the invention is that the heating power of the thermal runaway early warning sensor is reduced, the temperature of the oxidation-reduction reaction is basically controlled to be about 200 ℃, for example, 180 ℃ to 220 ℃, and at the moment, if the electrolyte leakage occurs, the rapid change characteristic of the gas concentration can be captured, so that the final power can be controlled to be about 1mA to 3mA, although partial performance is sacrificed, the warning effect can be achieved, the BMS is awakened to run at full power, and then the BMS is awakened, so that the terminal client can receive the gas. And at the moment, the power is 1/3-2/3 when the power is operated only at full power, so that the service time of the small storage battery can be greatly prolonged.
The experimental procedure was as follows:
a thermal runaway early warning sensor is arranged in a test instrument, and heating voltage is set. Filling clean air into a test instrument, calibrating a resistance value R0 of a gas chip of the thermal runaway early warning sensor after the test instrument is electrified for 30 minutes to be stable, then dynamically filling 1000ppm of ethanol gas into the test instrument, calibrating the gas concentration through PID (proportion integration differentiation) equipment, and recording the resistance value of the gas chip after the gas chip is stable in the delta T time as Rs;
by the formula: Δ C = (R0-Rs)/Rs ×, calculating the resistance change of the gas chip under the current gas concentration, calculating Δ C/Δ T, which is the ratio of the current gas chip to the current gas chip during the time change, and expressing the resistance change rule of the gas chip of the sensor under the current gas concentration by using a time and resistance change relation curve.
The experiment is carried out on the gas chips of various sensors, and curves under the operation of various gas concentrations and various powers are used as original reference bases. The gas concentration value is the highest limit, such as 1000ppm to 5000ppm, depending on the maximum value of the gas chip at full power operation. The power is controlled by voltage, the voltage value is controlled between 0.9V and 1.8V, and the power is regulated by regulating the voltage duty ratio.
In the experimental process, the temperature is controlled to be 25 +/-2 ℃, and the humidity is (30 +/-3)% RH to (65 +/-3)% RH. The experimental process is completed strictly according to the requirements.
The original reference basis is used as a judgment basis for low-power detection of the gas chip of the thermal runaway early warning sensor, after the automobile is stopped and is powered off at high voltage, the gas chip of the thermal runaway early warning sensor is enabled to run at low power, and the running power is 13mW to 35 mW. And measuring to obtain a resistance value change rule of the gas chip, comparing the resistance value change rule with a preset thermal runaway resistance value change rule, and activating the thermal runaway early warning sensor to run at full power when the measured resistance value rule is matched with the thermal runaway resistance value change rule. And when the actual thermal runaway is determined, awakening the BMS and feeding back information to the terminal.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A low-power detection method for a thermal runaway early warning sensor gas chip is characterized by comprising the following steps: the method comprises the following steps:
(1) obtaining resistance value change rule parameters of the gas chip for different gas concentrations during low-power operation through experiments;
(2) enabling a gas chip of the thermal runaway early warning sensor to be in low-power operation;
(3) measuring to obtain a resistance value change rule of the gas chip, and comparing the resistance value change rule with a preset thermal runaway resistance value change rule;
(4) when the measured resistance value rule is matched with the thermal runaway resistance value change rule, activating the thermal runaway early warning sensor to run at full power;
(5) when the thermal runaway early warning sensor runs at full power, whether the thermal runaway is in an actual thermal runaway state is determined, when the actual thermal runaway is determined, the BMS is awakened, information is fed back to the terminal,
the low power operation is where the gas chip is operating at power rating of 1/3 to 2/3.
2. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 1, wherein: the low power value is 13mW to 35 mW.
3. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 1, wherein: the working temperature of the thermal runaway early warning sensor is 180-220 ℃.
4. The low power detection method of the thermal runaway early warning sensor gas chip as claimed in any one of claims 1 to 3, wherein: the experimental method in the step (1) comprises the following small steps:
(1.1) arranging a thermal runaway early warning sensor in a test instrument, and setting a heating voltage;
(1.2) filling clean air into a test instrument, and calibrating the resistance value R0 of a gas chip of the thermal runaway early warning sensor after the test instrument is stabilized;
(1.3) dynamically filling thermal runaway gases with different concentrations into a test instrument, and recording the resistance value of the gas chip after being stabilized in the delta T time as Rs;
(1.4) calculating the time variation ratio of the resistance value of the gas chip under different gas concentrations: Δ C/Δ T, wherein Δ C = (R0-Rs)/Rs ×, and R% is an efficiency value corresponding to different thermal runaway gases, and a gas chip resistance time variation ratio is used as a resistance variation rule parameter.
5. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 4, wherein: the experiments of the steps (1.1) - (1.4) are carried out for different heating voltages between 0.9V and 1.8V, and the results are taken as resistance variation law parameters.
6. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 4, wherein: in the step (1.4), the concentration of different gases is 1000ppm to 5000 ppm.
7. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 4, wherein: the thermal runaway gas is ethanol gas.
8. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 4, wherein: the r% value in step (1.4) is 90%.
9. The low-power detection method for the thermal runaway early warning sensor gas chip as claimed in claim 4, wherein: the temperature in the experiment is 25 +/-2 ℃, and the humidity is (30 +/-3)% RH to (65 +/-3)% RH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353709.1A CN114563447A (en) | 2020-11-27 | 2020-11-27 | Low-power detection method for gas chip of thermal runaway early warning sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353709.1A CN114563447A (en) | 2020-11-27 | 2020-11-27 | Low-power detection method for gas chip of thermal runaway early warning sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114563447A true CN114563447A (en) | 2022-05-31 |
Family
ID=81711874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011353709.1A Pending CN114563447A (en) | 2020-11-27 | 2020-11-27 | Low-power detection method for gas chip of thermal runaway early warning sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114563447A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135524A1 (en) * | 2008-05-06 | 2009-11-12 | Siemens Aktiengesellschaft | Danger alarm |
| US20140216129A1 (en) * | 2013-01-31 | 2014-08-07 | Sensirion Ag | Portable sensor device with a gas sensor and low-power mode |
| CN204087439U (en) * | 2014-09-18 | 2015-01-07 | 天津市浦海新技术有限公司 | A kind of detecting alarm |
| CN205680751U (en) * | 2016-05-25 | 2016-11-09 | 烟台创为新能源科技有限公司 | A kind of battery thermal runaway detecting system |
| CN109017363A (en) * | 2018-06-28 | 2018-12-18 | 清远市敬威能源开发有限公司 | A kind of battery thermal runaway detection system of new-energy automobile |
| CN109786872A (en) * | 2019-03-18 | 2019-05-21 | 北京航空航天大学 | A kind of lithium ion battery thermal runaway early warning system and method |
| CN111028459A (en) * | 2019-12-10 | 2020-04-17 | 安徽芯核防务装备技术股份有限公司 | Method and device for detecting fire of battery box with low power consumption |
| CN111391668A (en) * | 2020-03-31 | 2020-07-10 | 威睿电动汽车技术(宁波)有限公司 | Battery thermal runaway early warning processing method, device, equipment and storage medium |
-
2020
- 2020-11-27 CN CN202011353709.1A patent/CN114563447A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135524A1 (en) * | 2008-05-06 | 2009-11-12 | Siemens Aktiengesellschaft | Danger alarm |
| US20140216129A1 (en) * | 2013-01-31 | 2014-08-07 | Sensirion Ag | Portable sensor device with a gas sensor and low-power mode |
| CN204087439U (en) * | 2014-09-18 | 2015-01-07 | 天津市浦海新技术有限公司 | A kind of detecting alarm |
| CN205680751U (en) * | 2016-05-25 | 2016-11-09 | 烟台创为新能源科技有限公司 | A kind of battery thermal runaway detecting system |
| CN109017363A (en) * | 2018-06-28 | 2018-12-18 | 清远市敬威能源开发有限公司 | A kind of battery thermal runaway detection system of new-energy automobile |
| CN109786872A (en) * | 2019-03-18 | 2019-05-21 | 北京航空航天大学 | A kind of lithium ion battery thermal runaway early warning system and method |
| CN111028459A (en) * | 2019-12-10 | 2020-04-17 | 安徽芯核防务装备技术股份有限公司 | Method and device for detecting fire of battery box with low power consumption |
| CN111391668A (en) * | 2020-03-31 | 2020-07-10 | 威睿电动汽车技术(宁波)有限公司 | Battery thermal runaway early warning processing method, device, equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5287815B2 (en) | Fuel cell system, negative voltage factor identification method and program | |
| CN107599854B (en) | Electric vehicle low-voltage battery management method and device | |
| US8815423B2 (en) | Fuel cell system comprising voltage adjustment portion, control method for the fuel cell system, and vehicle equipped with the fuel cell system | |
| US20100052617A1 (en) | Degradation determination method for lithium-ion battery, control method for lithium-ion battery, degradation determination apparatus for lithium-ion battery, control apparatus for lithium-ion battery, and vehicle | |
| CN111216593B (en) | New energy vehicle, power supply control method and storage medium | |
| CN111060828B (en) | Battery state monitoring method and device | |
| CN105510830B (en) | Method for monitoring the state of a battery in a motor vehicle | |
| KR101417290B1 (en) | Fuel cell system operating method | |
| CN106299417B (en) | Apparatus and method for controlling operation of fuel cell system | |
| US20100264930A1 (en) | Fuel cell system | |
| CN109263631B (en) | Power limiting method for power source of hybrid electric vehicle | |
| US8481220B2 (en) | Fuel cell power supply | |
| JP2013210257A (en) | Power storage device for railroad vehicle | |
| US8710790B2 (en) | Fuel cell system, and electric vehicle equipped with the fuel cell system | |
| CN103630726B (en) | Estimation method of battery polarization voltage in BMS (battery management system) sleep mode | |
| CN113071370B (en) | Management method of low-voltage lithium battery of electric automobile and complete automobile power supply switching method | |
| CN114497651A (en) | Fuel cell single-chip consistency evaluation device and method | |
| CN114563447A (en) | Low-power detection method for gas chip of thermal runaway early warning sensor | |
| CN112793465B (en) | Thermal runaway early warning method and application of ternary lithium ion battery system | |
| JP4614182B2 (en) | FUEL CELL SYSTEM, CONTROL METHOD FOR FUEL CELL SYSTEM, COMPUTER PROGRAM THEREOF, AND RECORDING MEDIUM RECORDING THE SAME | |
| CN117048426A (en) | Electric quantity balancing method and system for vehicle battery pack and vehicle | |
| US20220385095A1 (en) | Fast Charging Method | |
| CN113022381B (en) | Power self-adaptive control method and system for fuel cell power system | |
| US20160043414A1 (en) | Methods for testing anode integrity during fuel cell vehicle operation | |
| CN115395630A (en) | Lithium battery charging method based on commercial power and solar energy cooperative charging |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |