CN115376289A - Lithium battery thermal runaway monitoring and early warning device and method - Google Patents
Lithium battery thermal runaway monitoring and early warning device and method Download PDFInfo
- Publication number
- CN115376289A CN115376289A CN202210782852.5A CN202210782852A CN115376289A CN 115376289 A CN115376289 A CN 115376289A CN 202210782852 A CN202210782852 A CN 202210782852A CN 115376289 A CN115376289 A CN 115376289A
- Authority
- CN
- China
- Prior art keywords
- sensor
- lithium battery
- thermal runaway
- early warning
- control unit
- 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
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a lithium battery thermal runaway monitoring and early warning device and method 2 A sensor, a smoke sensor, an air pressure sensor and a temperature sensor; the casing is located the lithium cell package, and the integration has the control unit on the PCBA circuit board, and the control unit detects the gas state of lithium cell in taking place thermal runaway in-process battery package through each sensor. This early warning device monitors battery thermal runaway process through the collaborative work of 5 kinds of sensors, has guaranteed the reliability, makes electric automobile driver fully know lithium cell operating condition through multistage early warning mechanism simultaneously, when the abnormal conditions appears in the lithium cell, provides enough reaction time for personnel keep away the danger in the car.
Description
Technical Field
The invention relates to the technical field of new energy automobile power batteries, in particular to a lithium battery thermal runaway early warning monitoring method.
Background
With the popularization of new energy automobiles, people pay more and more attention to the new energy automobiles, and lithium batteries have become the mainstream choice of power batteries for vehicles by virtue of the advantages of high capacity, high output voltage, high charging rate, high energy density, low self-discharge, excellent cycle characteristics and the like. However, the high activity of the electrode material and the flammability of the electrolyte material determine that the risk of thermal runaway of the lithium battery always exists.
In a practical process, the occurrence of thermal runaway of a lithium battery monomer is essentially a severe side reaction of an electrolyte and is a gradual process. At the initial stage of thermal runaway, due to the structural characteristics of the lithium battery, the voltage is taken as a main output external parameter of the battery and is not changed obviously, and along with the degradation reaction of an electrolyte solution solvent, gas can escape from the inside of the lithium battery, so that the internal pressure and temperature are increased; with the further increase of thermal runaway, a large amount of gas and smog are generated inside the lithium battery, and the temperature and the air pressure reach peak values until the battery is ignited and burnt. In the existing lithium battery thermal runaway early warning device, early warning is mainly carried out through characteristics such as voltage, surface temperature, gas and smoke in a battery pack, and actually, explicit characteristic signals of the early warning are usually lagged behind internal characteristics of the battery, so that safety accidents such as fire disasters are very likely to happen when the early warning is found out to be in a dangerous stage. Therefore, monitoring the internal characteristics of the lithium battery in the early stage of thermal runaway of the lithium battery and obtaining stable and reliable signals to realize early warning have important significance.
Disclosure of Invention
In view of this, the invention provides a lithium battery thermal runaway monitoring and early warning device, which comprises a shell, and a blower fan, a PCBA circuit board, a CO sensor and infrared CO arranged in the shell 2 A sensor, a smoke sensor, an air pressure sensor and a temperature sensor;
PCBA circuit boardA control unit integrated with the CO sensor and the infrared CO 2 The sensor, the smoke sensor, the air pressure sensor and the temperature sensor are electrically connected; wherein the CO sensor is infrared CO 2 The sensor, the smoke sensor, the air pressure sensor and the temperature sensor are respectively used for detecting the concentration and CO in the air in the shell 2 Concentration, smoke concentration, air pressure and temperature;
the shell is positioned in a lithium battery pack of the electric automobile; the casing includes last casing and lower casing, be equipped with air inlet, gas outlet on the casing down, the blower fan is fixed in on the casing down, the blower fan is and inhales external air from the air inlet and make the inspiratory air discharge from the gas outlet after flowing in the casing.
Further, still be equipped with ventilating board and guide plate in the casing, the ventilating board is located the fan top of blowing, the guide plate is located between ventilating board and the PCBA circuit board, ventilating board and guide plate are used for making follow the air that the air intake got into partly follow the gas outlet flows out, and the perpendicular circulation that upwards of another part.
Furthermore, the smoke sensor is an aerosol laser dust sensor, the smoke sensor is fixed on the guide plate, and the laser emission direction of the smoke sensor is perpendicular to the air circulation direction on the guide plate.
The invention also provides a lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device, which comprises the following steps:
s1, a control unit controls a CO sensor to be in a continuous working state, controls a blast fan to be in a periodic working state and controls infrared CO 2 The sensor, the temperature sensor, the air pressure sensor and the smoke sensor are in a dormant state, and the detection data of the CO sensor are collected in real time;
s2, judging the current working state of the lithium battery based on the detection data of the CO sensor;
if the lithium battery is judged to be in the initial stage of thermal runaway, a first-stage early warning signal is sent out, and meanwhile infrared CO is controlled 2 Sensor, temperature sensor, air pressure transmitterThe sensor, the smoke sensor and the blast fan enter a continuous working state;
s3, monitoring detection data of each sensor in real time by the control unit, and judging whether the lithium battery enters a thermal runaway aggravation stage or not;
and if the control unit judges that the lithium battery enters a thermal runaway aggravation stage, a secondary early warning signal is sent out.
Further, in step S2, based on the detection data of the CO sensor, the current working state of the lithium battery is determined, which specifically includes:
and when monitoring that the CO concentration value reaches a first threshold value, the control unit judges that the lithium battery enters a thermal runaway initial stage.
Further, in step S2, based on the detection data of the CO sensor, the current working state of the lithium battery is determined, which specifically includes:
and when monitoring that the change rate of the CO concentration value along with the time exceeds a first threshold value, the control unit judges that the lithium battery enters a thermal runaway initial stage.
Further, the control unit monitors the detection data of each sensor in real time in step S3, and determines whether the lithium battery enters a thermal runaway aggravation stage, specifically including:
if the control unit detects infrared CO 2 If at least any detection data of the sensor, the smoke sensor, the air pressure sensor and the temperature sensor exceeds a corresponding set threshold and the detection data of the CO sensor exceeds a second threshold, judging that the lithium battery enters a thermal runaway aggravation stage and sending a secondary early warning signal by the control unit;
wherein the second threshold value of the CO concentration is higher than the first threshold value.
Further, the control unit monitors the detection data of each sensor in real time in step S3, and after determining whether the lithium battery enters a thermal runaway aggravation stage, the method further includes:
s4, if no infrared CO is detected in T time 2 If at least any detection data of the sensor, the smoke sensor, the air pressure sensor and the temperature sensor exceeds a corresponding set threshold value and the detection data of the CO is not changed, the primary early warning module is removedEquation (iv) and returns to step S1.
Further, the primary early warning signal and/or the secondary early warning signal can give an early warning in at least one mode of signal lamp and sound control alarm.
The lithium battery thermal runaway monitoring and early warning device and method provided by the invention have the beneficial effects that: this monitoring and early warning device is integrated a plurality of sensors on PCBA circuit board, has improved the integrated level of device, has guaranteed monitoring and early warning reliability.
The monitoring and early warning device is internally provided with the blast fan, and the blast fan can stir gas in the battery pack when working, so that the gas replacement is accelerated, each sensor can respond quickly, and the early warning can be carried out more quickly;
the infrared CO of the monitoring and early warning device 2 The sensor, the smoke sensor, the temperature sensor and the air pressure sensor are in a sleep mode when the lithium battery works normally, and the blowing fan is in a periodic working mode, so that the power consumption of the device is greatly reduced, and the service lives of a smoke sensor laser and the blowing fan are prolonged.
According to the monitoring and early warning method, the concentration change characteristic of CO gas generated by electrolyte leakage in the initial stage of thermal runaway of the lithium battery and the change characteristic of other signal gases and environmental parameters in the later stage are utilized, a grading early warning working mode is set, and sufficient reaction time is reserved before people in a vehicle encounter the problem of thermal runaway ignition of the lithium battery.
Drawings
Fig. 1 is a schematic perspective view of a lithium battery thermal runaway monitoring and early warning device according to an embodiment of the invention.
Fig. 2 is a perspective view of the lower cover 1 in fig. 1.
Fig. 3 is a schematic view of the structure of the ventilation board 6 in fig. 1.
Fig. 4 is a schematic view of an air flow channel in a housing of a lithium battery thermal runaway monitoring and early warning device according to an embodiment of the invention.
Fig. 5 is a flow chart of a lithium battery thermal runaway monitoring and early warning method according to an embodiment of the invention.
In the above figures: 1-lower cover, 11-inlet, 12-outlet, 2-upper cover, 3-blower fan4-PCBA Circuit Board, 41-Smoke detection Module, 42-Infrared CO 2 The air conditioner comprises a detection module, 5-guide plates, 6-ventilating plates, 61-first through holes, 62-second through holes and 63-third through holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 4, a lithium battery thermal runaway monitoring and early warning device includes a housing, and a blower fan 3 and a PCBA circuit board 4 disposed in the housing.
The casing is the cavity rectangle, and the casing includes lid 2 and lower lid 1, goes up lid 2 and passes through screw connection under on lid 1, be equipped with air inlet 11, gas outlet 12 down on the lid 1, and just 1 both sides of casing all are equipped with the engaging lug down, and the engaging lug is used for wholly connecting casing in electric trolley's lithium cell package.
Besides the blower fan 3 and the PCBA 4, a smoke sensor 41 and an infrared CO are arranged in the shell 2 Sensor 42, guide plate 5, ventilating board 6, wherein, the fan 3 that blows sets up on lid 1 down, ventilating board 6 sets up in fan 3 top, and guide plate 5 sets up in ventilating board 6 top, PCBA circuit board 4 sets up in guide plate 5 top, and PCBA circuit board 4 is last to be integrated with the control unit, smoke transducer 41 and infrared CO 2 The sensors 42 are all fixed below the PCBA circuit board 4. And the smoke sensor 41 is fixed on the guide plate 5, and infrared CO 2 The sensor is fixed in PCBA circuit board 4 lower surface.
An air pressure sensor, a temperature sensor and a CO sensor (the air pressure sensor, the temperature sensor and the CO sensor are all attached to the lower surface of the PCBA circuit board 4) are arranged below the PCBA circuit board 4, and a smoke sensor 41 and the CO sensor are arranged on the lower surface of the PCBA circuit board 4 2 The sensor 42, the air pressure sensor, the temperature sensor, the CO sensor and the blower fan 3 are all electrically connected to the control unit. CO sensor, infrared CO 2 The sensor 42, the smoke sensor 41, the air pressure sensor, and the temperature sensor are used for detecting the CO concentration and CO in the air in the housing, respectively 2 Concentration, smoke concentration, and air pressure and temperature in the housing, and detecting dataSending to a control unit; preferably, the infrared CO 2 The detection module is an NDIR gas sensor, and the CO sensor is a metal oxide CO sensor of MEMS (micro electro mechanical system).
Further, the ventilation plate 6 and the baffle plate 5 are used for enabling a part of the air entering from the air inlet to flow out of the air outlet and enabling the other part of the air to vertically flow upwards. Specifically, be equipped with three groups of through-holes on the ventilating board 6, be first through-hole 61, second through-hole 62 and third through-hole 63 respectively, fan 3 is used for passing through the air outside the casing (in the lithium cell package) in the baffle 5 takes out to the casing, and some air currents carry out smog concentration value in the gas and detect, finally flow from the gas outlet, and another part air current flows to PCBA circuit board direction along vertical direction under the ventilating board guide to make the sensor that sets up on PCBA circuit board can sense the CO in the gas fast to the messenger and to set up 2 The concentration, CO concentration, temperature and air pressure are changed, so that the response speed of the device is improved. Specifically, after the air outside the housing is pumped into the housing by the blower fan 3, the air enters the upper part of the ventilation plate 6 through the first air guide hole 61, and downwardly enters the lower part of the ventilation plate 6 through the second through hole 2 after passing through the flow guide plate 5, and a part of the air directly exits from the air outlet through the blower fan 3 to form a first air flow channel, wherein the smoke sensor 41 is fixed on the flow guide plate 5, and the concentration value of smoke particles in the air can be obtained when the air in the first air flow channel passes through the detection area of the smoke sensor 41; in addition, the other part of the gas driven by the blower fan 3 is diffused upwards from the third through hole 63 on the ventilating plate 6, passes through the flow guide plate 5 and is diffused to the lower part of the PCBA 4, so that CO below the PCBA 4 is enabled to be diffused 2 The sensor 42, the air pressure sensor, the temperature sensor and the CO sensor can quickly respond to CO in the air 2 Concentration, CO concentration, temperature and pressure.
Further, the smoke sensor 41 is an aerosol laser dust sensor, the smoke sensor 41 is fixed on the flow guide plate 5, and a laser emission direction of the smoke sensor 41 is perpendicular to the first air flow channel.
The control unit on the PCBA circuit board 4 is also connected with a central controller of the electric automobile, and the control unit is used for judging the state of the lithium battery according to data sensed by the sensors and sending corresponding early warning information to the central controller.
In the practical use of the electric vehicle, the occurrence of thermal runaway of the lithium battery pack is essentially a severe side reaction of the electrolyte and is a gradual process. At the initial stage of thermal runaway, due to the structural characteristics of the battery, the voltage is often not changed significantly as the main output external parameter of the battery. When the battery core of the battery is damaged, the electrolyte begins to leak, the leaked electrolyte solvent undergoes a degradation reaction, and gas (typically CO gas) can escape from the battery; when thermal runaway occurs and enters an aggravation stage, a large amount of gas and smoke are generated inside the battery, and the temperature and the air pressure reach peak values until the battery is ignited and burnt. The prime time period from the beginning of the battery failure until the battery is on fire is the active warning of thermal runaway, and it is important to provide a stable and reliable warning signal during the prime time period.
Referring to fig. 5, the present invention further provides a lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning apparatus, including the following steps:
s1, a control unit controls a CO sensor to be in a continuous working state, controls a blowing fan to be in a periodic working state and controls infrared CO 2 The sensor, the temperature sensor, the air pressure sensor and the smoke sensor are in a dormant state, and the detection data of the CO sensor are collected in real time;
it should be noted that, in this embodiment, the blower fan adopts a periodic working mode, a specific working frequency may be 8s for 1min, 15s for 1min, or 20s for 1min, and may be set according to a specific working scenario, which is not limited in this scheme.
In particular, infrared CO 2 The sensor can use an infrared gas sensor to replace a traditional gas sensor, and the timeliness and the reliability of safety monitoring are improved while the real monitoring is met. In addition, the smoke sensor is an aerosol laser dust sensor.
It should be noted that, through a large number of field experimental tests, the battery is found to be presentAt the initial stage of other abnormalities such as electrolyte leakage or cell breakage, thermal runaway combustion reaction is not generated, certain CO gas and CO are generated firstly 2 In a relatively stable concentration, no smoke is generated, and the temperature and pressure change is not particularly obvious, so in the embodiment, the CO sensor is controlled to be in a continuous working state, the blowing fan is controlled to be in a periodic working state, and the infrared CO is controlled 2 The sensor, the temperature sensor, the air pressure sensor and the smoke sensor are in a dormant state, and the monitoring of the CO concentration value is used as an important means for judging the initial stage of the thermal runaway of the lithium battery.
S2, judging the current working state of the lithium battery based on the detection data of the CO sensor;
if the lithium battery is judged to be in the initial stage of thermal runaway, a first-stage early warning signal is sent out, and meanwhile infrared CO is controlled 2 The sensor, the temperature sensor, the air pressure sensor, the smoke sensor and the blast fan enter a continuous working state;
in this embodiment, considering that the thermal runaway is a gradual process, and various phenomena and parameter changes do not occur simultaneously, in order to save energy consumption and prolong the service life of each sensor and related components, before determining that the lithium battery enters the initial stage of thermal runaway determination, the infrared CO is used 2 The sensor, the smoke sensor, the temperature sensor and the air pressure sensor are controlled to be in a dormant state in a unified way, and it is needless to say that, in comparison, infrared CO is used 2 The power consumption of the sensor and the smoke sensor is high, in other embodiments, the two sensors can be only controlled to be in a dormant state temporarily, and the temperature sensor and the air pressure sensor are always in a normal working state.
In the step S2, the control unit obtains detection data of each sensor in real time, and determines a current working state of the lithium battery, which specifically includes:
when monitoring that the CO concentration reaches a first threshold value, the control unit judges that the lithium battery enters a thermal runaway initial stage;
when the electrolyte of lithium cell takes place to leak or other unusual, electrolyte takes place to decompose or reacts with the air, can release CO gas at first, arouses the change of CO concentration, consequently, through the monitoring to CO concentration, can send one-level early warning signal at the initial stage that the lithium cell broke down, can give personnel in the car to wake up through the mode of signal lamp.
Further, when the control unit monitors that the change rate of the CO concentration along with the time exceeds the first threshold value, the lithium battery is judged to enter the initial stage of thermal runaway.
It can be understood that the occurrence of thermal runaway of a lithium battery is a very violent process, and once the occurrence of thermal runaway occurs, the concentration of gas changes sharply, so that the determination of thermal runaway can be further performed by monitoring the change rate of the CO concentration with time.
S3, monitoring detection data of each sensor in real time by the control unit, and judging whether the lithium battery enters a thermal runaway aggravation stage or not;
if the control unit judges that the lithium battery enters a thermal runaway aggravation stage; the control unit sends a secondary early warning signal to a central controller of the electric automobile;
in the step S3, the control unit monitors the detection data of each sensor in real time, and determines whether the lithium battery enters a thermal runaway aggravation stage, specifically including:
if the control unit detects infrared CO 2 If at least any detection parameter of the sensor, the smoke sensor, the air pressure sensor and the temperature sensor exceeds a corresponding set threshold value and the detection data of the CO sensor exceeds a second threshold value, judging that the lithium battery enters a thermal runaway aggravation stage and sending a secondary early warning signal by the control unit;
wherein the second threshold value of the CO concentration is higher than the first threshold value.
The second-level early warning signal can remind people in the vehicle to leave the vehicle and escape through sound control alarm.
Further, in step S3, the control unit monitors the detection data of each sensor in real time, and determines whether the lithium battery enters a thermal runaway aggravation stage, and the method further includes:
s4, if no infrared CO is detected in T time 2 Sensor, smoke sensor, air pressure transmitterAnd if at least any detection data of the sensor and the temperature sensor exceeds a corresponding set threshold value and the detection data of the CO does not change, the primary early warning mode is released and the step S1 is returned.
It can be understood that the combined use of multiple sensors can effectively avoid false alarm of thermal runaway.
The device and the method for monitoring and early warning the thermal runaway of the lithium battery of the electric vehicle have the following advantages that:
1) The reliability is high: the early warning device passes through CO 2 The integration of 5 sensors of CO, temperature and air pressure sensor and smoke sensor is high, the integration level is high, the size is small, and the reliability of monitoring and early warning is higher.
2) Quick response: be equipped with the blast fan in this early warning monitoring devices, the blast fan is at the during operation, stirs the interior gas of lithium cell package, and gaseous replacement accelerates, makes each sensor can quick response to gas, can realize more quick early warning.
3) Alarming in advance: according to the method, the concentration change characteristic of CO gas generated by electrolyte leakage in the initial thermal runaway stage of the lithium battery and the change characteristic of other signal gases and environmental parameters in the later stage are utilized, a grading early warning working mode is set, and sufficient reaction time is reserved for personnel in a vehicle before encountering the problem of thermal runaway fire of the lithium battery.
4) Long service life, low power consumption: the method controls infrared CO through working logic 2 The sensor, the smoke sensor, the temperature sensor and the air pressure sensor are in a sleep mode when the lithium battery works normally, and the blowing fan is in a periodic working mode, so that the power consumption of the device is greatly reduced, and the service lives of a smoke sensor laser and the blowing fan are prolonged
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The embodiments and features of the embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A lithium battery thermal runaway monitoring and early warning device is characterized by comprising a shell, and a blower fan, a PCBA circuit board, a CO sensor and infrared CO arranged in the shell 2 A sensor, a smoke sensor, an air pressure sensor and a temperature sensor;
the PCBA circuit board is integrated with a control unit, the control unit is connected with the CO sensor and the infrared CO 2 The sensor, the smoke sensor, the air pressure sensor and the temperature sensor are electrically connected; wherein the CO sensor is infrared CO 2 The sensor, the smoke sensor, the air pressure sensor and the temperature sensor are respectively used for detecting the concentration and the CO in the air in the shell 2 Concentration, smoke concentration, air pressure and temperature;
the shell is positioned in a lithium battery pack of the electric automobile; the casing includes last casing and lower casing, be equipped with air inlet, gas outlet on the casing down, the blast fan is fixed in on the casing down, the blast fan inhales external air from the air inlet and makes the inspiratory air discharge from the gas outlet after flowing in the casing.
2. The lithium battery thermal runaway monitoring and early warning device as claimed in claim 1, wherein a ventilation plate and a flow guide plate are further arranged in the housing, the ventilation plate is located above the blower fan, the flow guide plate is located between the ventilation plate and the PCBA circuit board, and the ventilation plate and the flow guide plate are used for enabling a part of air entering from the air inlet to flow out of the air outlet and the other part of air to flow vertically upwards.
3. The lithium battery thermal runaway monitoring and early warning device as claimed in claim 1, wherein the smoke sensor is an aerosol laser dust sensor, the smoke sensor is fixed on the flow guide plate, and a laser emission direction of the smoke sensor is perpendicular to an air circulation direction on the flow guide plate.
4. A lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device as claimed in claim 1 is characterized by comprising the following steps:
s1, a control unit controls a CO sensor to be in a continuous working state, controls a blast fan to be in a periodic working state and controls infrared CO 2 The sensor, the temperature sensor, the air pressure sensor and the smoke sensor are in a dormant state, and the detection data of the CO sensor are collected in real time;
s2, judging the current working state of the lithium battery based on the detection data of the CO sensor;
if the lithium battery is judged to be in the initial stage of thermal runaway, a primary early warning signal is sent out, and infrared CO is controlled simultaneously 2 The sensor, the temperature sensor, the air pressure sensor, the smoke sensor and the blast fan enter a continuous working state;
s3, monitoring detection data of each sensor in real time by the control unit, and judging whether the lithium battery enters a thermal runaway aggravation stage or not;
and if the control unit judges that the lithium battery enters a thermal runaway aggravation stage, a secondary early warning signal is sent out.
5. The lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device according to claim 4, wherein the step S2 of judging the current working state of the lithium battery based on the detection data of the CO sensor specifically comprises the following steps:
and when monitoring that the CO concentration value reaches a first threshold value, the control unit judges that the lithium battery enters a thermal runaway initial stage.
6. The lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device as claimed in claim 4, wherein the step S2 of judging the current working state of the lithium battery based on the detection data of the CO sensor specifically comprises the following steps:
and when monitoring that the change rate of the CO concentration value along with the time exceeds a first threshold value, the control unit judges that the lithium battery enters a thermal runaway initial stage.
7. The lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device according to claim 5 or 6, wherein the step S3 is that the control unit monitors the detection data of each sensor in real time and judges whether the lithium battery enters a thermal runaway aggravation stage, and the method specifically comprises the following steps:
if the control unit detects infrared CO 2 If at least any detection data of the sensor, the smoke sensor, the air pressure sensor and the temperature sensor exceeds a corresponding set threshold value and the detection data of the CO sensor exceeds a second threshold value, the lithium battery is judged to enter a thermal runaway aggravation stage and a secondary early warning signal is sent out by the control unit;
wherein the second threshold value of the CO concentration is higher than the first threshold value.
8. The lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device as claimed in claim 7, wherein the control unit monitors the detection data of each sensor in real time in the step S3 and judges whether the lithium battery enters a thermal runaway aggravation stage, and the method further comprises:
s4, if the infrared CO is not detected within the time T 2 And (3) if at least any detection data of the sensor, the smoke sensor, the air pressure sensor and the temperature sensor exceeds a corresponding set threshold value and the detection data of the CO is not changed, removing the primary early warning mode and returning to the step (S1).
9. The lithium battery thermal runaway monitoring and early warning method based on the lithium battery thermal runaway monitoring and early warning device according to claim 4, wherein the primary early warning signal and/or the secondary early warning signal perform early warning in at least one mode of signal lamp and sound control warning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210782852.5A CN115376289A (en) | 2022-07-05 | 2022-07-05 | Lithium battery thermal runaway monitoring and early warning device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210782852.5A CN115376289A (en) | 2022-07-05 | 2022-07-05 | Lithium battery thermal runaway monitoring and early warning device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115376289A true CN115376289A (en) | 2022-11-22 |
Family
ID=84060903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210782852.5A Pending CN115376289A (en) | 2022-07-05 | 2022-07-05 | Lithium battery thermal runaway monitoring and early warning device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115376289A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116345013A (en) * | 2023-05-30 | 2023-06-27 | 苏州精控能源科技有限公司 | Vehicle-mounted battery system with temperature control and early thermal runaway inhibition functions |
| CN116799338A (en) * | 2023-08-22 | 2023-09-22 | 宁德时代新能源科技股份有限公司 | Battery, power utilization device and gas concentration detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190277916A1 (en) * | 2018-03-08 | 2019-09-12 | Industrial Technology Research Institute | Battery safety identifying method and method for setting hazard levels of battery internal short circuit and warning system using the same |
| 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 |
| CN113230560A (en) * | 2021-06-03 | 2021-08-10 | 安徽中科久安新能源有限公司 | Fire extinguishing and explosion preventing method for lithium ion electrochemical energy storage system |
| CN113370841A (en) * | 2021-06-29 | 2021-09-10 | 广东省粤科云创信息科技有限公司 | Device for improving running safety of new energy automobile |
| CN114100023A (en) * | 2021-10-15 | 2022-03-01 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Energy storage power station thermal runaway three-level early warning and fire-fighting linkage system |
-
2022
- 2022-07-05 CN CN202210782852.5A patent/CN115376289A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190277916A1 (en) * | 2018-03-08 | 2019-09-12 | Industrial Technology Research Institute | Battery safety identifying method and method for setting hazard levels of battery internal short circuit and warning system using the same |
| 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 |
| CN113230560A (en) * | 2021-06-03 | 2021-08-10 | 安徽中科久安新能源有限公司 | Fire extinguishing and explosion preventing method for lithium ion electrochemical energy storage system |
| CN113370841A (en) * | 2021-06-29 | 2021-09-10 | 广东省粤科云创信息科技有限公司 | Device for improving running safety of new energy automobile |
| CN114100023A (en) * | 2021-10-15 | 2022-03-01 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Energy storage power station thermal runaway three-level early warning and fire-fighting linkage system |
Non-Patent Citations (1)
| Title |
|---|
| 郭锐;: "新能源汽车锂电池热失控参数的提取及验证研究", 消防技术与产品信息, vol. 31, no. 09 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116345013A (en) * | 2023-05-30 | 2023-06-27 | 苏州精控能源科技有限公司 | Vehicle-mounted battery system with temperature control and early thermal runaway inhibition functions |
| CN116799338A (en) * | 2023-08-22 | 2023-09-22 | 宁德时代新能源科技股份有限公司 | Battery, power utilization device and gas concentration detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115376289A (en) | Lithium battery thermal runaway monitoring and early warning device and method | |
| CN110838609B (en) | Power battery thermal runaway protection method, device and system | |
| EP3024085B1 (en) | Secondary battery abnormality warning system | |
| CN113506924A (en) | Thermal runaway early warning method and system for battery pack | |
| CN112038560A (en) | Battery package thermal runaway early warning fire extinguishing systems | |
| CN112216891B (en) | Power battery system and thermal runaway monitoring method for power battery system | |
| CN113594598B (en) | Battery module and battery pack | |
| CN113948813B (en) | Explosion-proof control system and method for power battery | |
| CN115842183A (en) | Thermal runaway early warning system and early warning method for lithium ion battery energy storage cabin | |
| CN215299331U (en) | Battery system thermal runaway detection device, power battery system and automobile | |
| CN113782851A (en) | Protection device, battery energy storage system and electronic equipment | |
| CN117543125A (en) | Fire early warning exhaust system of energy storage battery compartment and control method | |
| CN212522788U (en) | Fire extinguishing device of battery pack | |
| CN214205009U (en) | Charging cabinet with fire protection device | |
| CN115911622B (en) | Battery pack, power utilization device and thermal runaway detection and control method of battery pack | |
| CN217548836U (en) | Fire extinguishing system | |
| CN213303230U (en) | Double-host fire alarm device for train | |
| CN213584665U (en) | Intelligent power distribution ring main unit monitoring system based on internet of things technology | |
| KR20220011859A (en) | Apparatus and method for detecting thermal runaway of vehicle battery | |
| CN219513185U (en) | Battery system thermal runaway detection device | |
| KR20230131333A (en) | Battery abnormality detection method and battery system assembly using the same | |
| CN206388298U (en) | Battery of electric vehicle spontaneous combustion alarming system | |
| CN221113607U (en) | Thermal runaway monitoring device for vehicle power battery pack | |
| CN218299891U (en) | Energy storage battery pack and energy storage system | |
| CN218676201U (en) | Portable energy storage fire hazard early warning device |
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 |