阅读说明：本技术 一种用于储能电池站主动安全防护系统及方法 (Active safety protection system and method for energy storage battery station ) 是由 廖晓锋 王庆 李勇 吴定洪 陈定海 刘亮 李彦君 彭晓 余盛宽 彭梁 戢行毅 于 2021-07-12 设计创作，主要内容包括：本发明属于储能电池技术领域,具体涉及一种用于储能电池站主动安全防护系统及方法。其技术方案为：一种用于储能电池站主动安全防护系统,包括安装于相邻锂电池模组之间的若干温度传感器和若干气体浓度探测器；还包括控制装置,锂电池模组、温度传感器和气体浓度探测器均与控制装置电连接；还包括灭火剂储罐,灭火剂储罐上连接有泵组,泵组的出口连接有灭火剂输送管道,灭火剂输送管道上连接有若干分支管道,分支管道上安装有电磁阀,锂电池模组上安装有喷嘴,喷嘴伸进锂电池模组内,喷嘴通过管道与分支管道连接,泵组和电磁阀均与控制装置电连接。本发明提供了一种能及时探测热失控并进行处理的用于储能电站主动安全防护系统及方法。(The invention belongs to the technical field of energy storage batteries, and particularly relates to an active safety protection system and method for an energy storage battery station. The technical scheme is as follows: an active safety protection system for an energy storage battery station comprises a plurality of temperature sensors and a plurality of gas concentration detectors, wherein the temperature sensors and the gas concentration detectors are arranged between adjacent lithium battery modules; the lithium battery module, the temperature sensor and the gas concentration detector are all electrically connected with the control device; still including the fire extinguishing agent storage tank, be connected with the pump package on the fire extinguishing agent storage tank, the exit linkage of pump package has fire extinguishing agent pipeline, is connected with a plurality of branch pipelines on the fire extinguishing agent pipeline, installs the solenoid valve on the branch pipeline, installs the nozzle on the lithium cell module, and in the nozzle stretched into the lithium cell module, the nozzle passed through the pipeline and is connected with the branch pipeline, and pump package and solenoid valve all are connected with controlling means electricity. The invention provides an active safety protection system and method for an energy storage power station, which can detect and process thermal runaway in time.)

1. An active safety protection system for an energy storage battery station is characterized by comprising a plurality of temperature sensors (2) and a plurality of gas concentration detectors (3) which are arranged between adjacent lithium battery modules (1); the lithium battery system is characterized by further comprising a control device (4), wherein the plurality of lithium battery modules (1), the plurality of temperature sensors (2) and the plurality of gas concentration detectors (3) are electrically connected with the control device (4); still include fire extinguishing agent storage tank (5), be connected with pump package (51) on fire extinguishing agent storage tank (5), the exit linkage of pump package (51) has fire extinguishing agent pipeline (52), be connected with a plurality of lateral conduits (53) on fire extinguishing agent pipeline (52), install solenoid valve (54) on lateral conduit (53), install nozzle (55) on lithium cell module (1), nozzle (55) stretch into in lithium cell module (1), nozzle (55) are connected with lateral conduit (53) through the pipeline, pump package (51) and solenoid valve (54) all are connected with controlling means (4) electricity.

2. The active safety protection system for the energy storage battery station as claimed in claim 1, wherein the temperature sensor (2) is a fiber grating temperature measuring element or a thermistor sensor.

3. Active safety protection system for energy storage battery stations, according to claim 1, characterized in that the gas concentration detector (3) comprises a CO concentration detector (31), H₂Concentration detector (32), CH₄A concentration detector (33).

4. The active safety shield system for an energy storage battery station of claim 1, wherein the fire extinguishing agent is a perfluorohexanone fire extinguishing agent.

5. Active safety protection system for energy storage battery stations, according to claim 1, characterized in that it further comprises ventilation means (61) mounted on the battery compartment (6), the ventilation means (61) being electrically connected to the control means (4).

6. The active safety protection system for the energy storage battery station according to claim 1, characterized in that a liquid supplementing interface is arranged on the fire extinguishing agent storage tank (5), and a liquid supplementing device (56) for supplementing the fire extinguishing agent is connected to the liquid supplementing interface.

7. The active safety protection system for the energy storage battery station is characterized by further comprising a point type smoke detector (62) installed in the battery chamber (6), wherein the point type smoke detector (62) is electrically connected with the control device (4).

8. An active safety protection method for an energy storage battery station is characterized by comprising the following steps:

s1: detecting the absolute temperature of the lithium battery module (1); detecting the voltage drop rate of the lithium battery module (1);

s2: analyzing the temperature rise rate of the lithium battery module (1) according to the absolute temperature change of the lithium battery module (1);

s3: whether the lithium battery module (1) is out of control by heat is judged, wherein the condition of the out of control by heat comprises the following two conditions:

s31: the absolute temperature of the monitoring point reaches the maximum working temperature specified by a manufacturer, and the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

s32: the voltage drop value of the lithium battery module (1) exceeds 25% of the initial voltage, and the temperature rise rate of a monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

s4: when taking place thermal runaway, spray extinguishing agent to the inside electric core that takes place thermal runaway's lithium cell module (1).

9. The active safety protection method for the energy storage battery station according to claim 8, characterized by further comprising the steps of:

t1: detect CO concentration, H of lithium cell module (1) department₂Concentration, CH₄Concentration;

t2: for detected CO concentration, H₂Concentration, CH₄Setting a primary early warning threshold and a secondary early warning threshold for the concentration;

t3: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary warning, judging that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module (1);

t4: when the step T3 takes place, the fire extinguishing agent is sprayed to the internal battery core of the lithium battery module (1) in thermal runaway.

10. A method for storing energy as claimed in claim 9The active safety protection method of the pool station is characterized in that in the step T2, the CO concentration and the H concentration₂Concentration, CH₄When any one of the concentrations exceeds a corresponding primary early warning threshold value, an early warning signal is sent out, and the concentration of CO and the concentration of H are₂Concentration, CH₄And when any one of the concentrations exceeds the corresponding secondary alarm threshold value, an alarm signal is sent out.

Technical Field

The invention belongs to the technical field of energy storage batteries, and particularly relates to an active safety protection system and method for an energy storage battery station.

Background

The existing energy storage battery temperature detection system mostly detects the ambient temperature by arranging a point type temperature sensor on a container, has serious response lag, cannot truly and effectively reflect the time point of thermal runaway of a battery core in a battery pack, and cannot accurately position the battery pack out of control. There is also the monitoring and early warning to the electricity core temperature among the current BMS (battery management system), but mostly only to the several welding point temperature in the group battery monitoring. Due to the fact that the technology accurate to the temperature management of the single battery cell is high in cost and difficult to popularize, temperature abnormity generated by thermal runaway of the single battery cell cannot be effectively monitored, and response lag exists.

The existing gas concentration detector can only detect the concentration of a single gas source, and when a lithium battery module is out of control or fails, the cell releases CO and H₂、CH₄When combustible gas is generated, the existing gas concentration detection device is difficult to analyze and judge the concentration of the multi-component mixed gas. In addition, the gas detection system of the energy storage battery detects the concentration of the environmental gas mostly by arranging a point type gas concentration detector on a container, has serious response lag, cannot truly and effectively reflect the time point of thermal runaway of a battery cell in the battery pack, and cannot accurately position the battery pack out of control.

The existing energy storage battery detection system can not comprehensively detect various parameters such as concentration and temperature of gas released in the early thermal runaway process, so that the early thermal runaway can not be timely and accurately found and correspondingly processed.

Disclosure of Invention

In order to solve the above problems in the prior art, an object of the present invention is to provide an active safety protection system and method for an energy storage power station, which can detect and process thermal runaway in time.

The technical scheme adopted by the invention is as follows:

an active safety protection system for an energy storage battery station comprises a plurality of temperature sensors and a plurality of gas concentration detectors, wherein the temperature sensors and the gas concentration detectors are arranged between adjacent lithium battery modules; the lithium battery module, the temperature sensors and the gas concentration detectors are all electrically connected with the control device; still including the fire extinguishing agent storage tank, be connected with the pump package on the fire extinguishing agent storage tank, the exit linkage of pump package has fire extinguishing agent pipeline, is connected with a plurality of branch pipelines on the fire extinguishing agent pipeline, installs the solenoid valve on the branch pipeline, installs the nozzle on the lithium cell module, and in the nozzle stretched into the lithium cell module, the nozzle passed through the pipeline and is connected with the branch pipeline, and pump package and solenoid valve all are connected with controlling means electricity.

The temperature sensor is embedded in the gap between the lithium battery modules, so that the temperature sensor can timely detect the temperature of high-heat gas released when the battery core of the lithium battery module is out of control due to thermal runaway, the gas concentration detector can timely detect the concentration of combustible gas, the occurrence of early thermal runaway can be judged according to the detection result, the lithium battery module in which the thermal runaway occurs can be rapidly positioned, and necessary conditions are created for timely fire extinguishing. The control device receives signals of the temperature sensor and the gas concentration detector, calculates the temperature rise rate, and can detect the voltage drop rate of the lithium battery module, so that the early thermal runaway can be judged conveniently through the voltage drop rate, the absolute temperature, the temperature rise rate and the gas concentration of the lithium battery module.

According to technical safety conditions of electric motor cars of Ministry of industry and State standards for safety requirements of power storage batteries for electric vehicles, the judgment of the thermal runaway state is generally based on the following conditions: when the following two and three occur simultaneously or the two and the three occur simultaneously, the thermal runaway is judged to occur: the temperature of a monitoring point reaches the maximum working temperature (generally 60 ℃) specified by a manufacturer; the voltage drop value of the battery exceeds the initial voltage by 25 percent; and thirdly, the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s.

In a preferred embodiment of the present invention, the temperature sensor is a fiber grating temperature measuring element or a thermistor sensor. The fiber grating temperature measuring element is used for measuring temperature, so that the remote monitoring of the measured signal is easy to realize. The fiber grating temperature measuring element has the advantages of good electrical insulation performance, good lightning stroke resistance, strong anti-electromagnetic interference capability, good long-term stability and high sensitivity.

As a preferred aspect of the present invention, the gas concentration detector includesCO concentration Detector, H₂Concentration detector, CH₄And a concentration detector. The invention can measure the concentration of CO and H₂Concentration, CH₄Concentration all sets up one-level early warning threshold value and second grade alarm threshold value to set up the rule of judging thermal runaway or other trouble, promptly: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary alarm, it is judged that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module. Therefore, the invention can judge the thermal runaway of the energy storage battery through gas detection monitoring.

In a preferred embodiment of the present invention, the fire extinguishing agent is a perfluorohexanone fire extinguishing agent. The perfluorohexanone fire extinguishing agent belongs to fluorinated ketones and is a liquid fire extinguishing agent; and the storage tank does not belong to dangerous goods, no residue is left after release, the pressure of the storage tank is low during transportation, and the transportation and the storage are very convenient and stable. According to the research of a key laboratory of a large fire disaster in China, perfluorohexanone shows a good inhibition effect on the fire disaster of a lithium iron phosphate battery, and the inhibition effect on the fire disaster of the battery is obviously better than that of other fire extinguishing agents by absorbing heat through vaporization while blocking the internal reaction of the battery.

The battery pack further comprises a ventilation device arranged on the battery bin, and the ventilation device is electrically connected with the control device. When the gas concentration detector detects the combustible gas concentration alarm signal in the battery compartment, the signal is sent to the control device, and the control device controls the ventilation device to be started, so that the combustible gas concentration in the battery compartment is reduced.

As a preferable scheme of the invention, the fire extinguishing agent storage tank is provided with a liquid supplementing interface, and the liquid supplementing interface is connected with a liquid supplementing device for supplementing the fire extinguishing agent. The fluid replacement device can be a separate fire extinguishing agent storage tank or a fire fighting truck. When the fire extinguishing agent in the fire extinguishing agent storage tank is insufficient, the liquid supplementing device supplements the fire extinguishing agent to the fire extinguishing agent storage tank through the liquid supplementing interface, and continuous fire extinguishing is guaranteed.

The invention further comprises a point type smoke detector arranged in the battery chamber, and the point type smoke detector is electrically connected with the control device. Whether some smoke detector surveyability has smog in the battery compartment, indicate that there is the lithium cell module condition of catching fire when some smoke detector detects smog. At the moment, the electromagnetic valves on all the branch pipelines can be controlled to be opened by the control device, so that the full-flooding fire extinguishing protection is carried out in the battery compartment.

An active safety protection method for an energy storage battery station comprises the following steps:

s1: detecting the absolute temperature of the lithium battery module; detecting the voltage drop rate of the lithium battery module;

s2: analyzing the temperature rise rate of the lithium battery module according to the absolute temperature change of the lithium battery module;

s3: whether thermal runaway occurs to the lithium battery module is judged, wherein the thermal runaway conditions comprise the following two conditions:

s31: the absolute temperature of the monitoring point reaches the maximum working temperature specified by a manufacturer, and the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

s32: the voltage drop value of the lithium battery module exceeds 25% of the initial voltage, and the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

s4: when taking place thermal runaway, spray extinguishing agent to the inside electric core of taking place thermal runaway's lithium cell module.

The temperature sensor can detect the absolute temperature of the lithium battery module, the control device can analyze the temperature rise rate of the lithium battery module after receiving the absolute temperature information, and the control device can detect the voltage drop rate of the lithium battery module. Thereby according to above-mentioned data information, the system can implement the monitoring lithium cell module and whether take place the thermal runaway, guarantees the very first time discovery thermal runaway and cools off or put out a fire to corresponding lithium cell module, reduces the loss.

Temperature sensor direct mount is between adjacent lithium battery module, and then the temperature variation when the lithium battery module takes place the thermal runaway can be in time discover. When spraying fire extinguishing agent to lithium battery module, the nozzle stretches into inside lithium battery module to in time cool off or put out a fire, improve cooling or fire control effect to electric core.

As a preferable scheme of the invention, the method further comprises the following steps:

t1: detect CO concentration, H of lithium cell module department₂Concentration, CH₄Concentration;

t2: for detected CO concentration, H₂Concentration, CH₄Setting a primary early warning threshold and a secondary early warning threshold for the concentration;

t3: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary warning, judging that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module;

t4: when step T3 takes place, spray extinguishing agent to the inside electric core of the lithium battery module that takes place thermal runaway.

The invention can measure the concentration of CO and H₂Concentration, CH₄Concentration all sets up one-level early warning threshold value and second grade alarm threshold value to set up the rule of judging thermal runaway or other trouble, promptly: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary alarm, it is judged that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module. Therefore, the invention can judge the thermal runaway of the energy storage battery through gas detection monitoring. When gas concentration reaches alarm state, can trigger controlling means to controlling means control relevant position's nozzle cools off or puts out a fire to the electric core of lithium cell module.

As a preferred embodiment of the present invention, in the step T2, the CO concentration and H₂Concentration, CH₄When any one of the concentrations exceeds a corresponding primary early warning threshold value, an early warning signal is sent out, and the concentration of CO and the concentration of H are₂Concentration, CH₄And when any one of the concentrations exceeds the corresponding secondary alarm threshold value, an alarm signal is sent out. CO concentration Detector, H₂Concentration detector, CH₄The concentration detector detects gas between adjacent lithium battery modules in the battery pack, so that the gas released when the lithium battery modules are out of control due to heat or other faults can be detected at the first time, and the response of gas detection is quicker. The occurrence of heat can be accurately judged through the early warning or the alarm sent by the gas concentration detector at the corresponding positionThe position of the lithium battery module out of control or other faults provides necessary conditions for processing the thermal runaway or faults.

The invention has the beneficial effects that:

the temperature sensor is embedded in the gap between the lithium battery modules, so that the temperature sensor can timely detect the temperature of high-heat gas released when the battery core of the lithium battery module is out of control due to thermal runaway, the gas concentration detector can timely detect the concentration of combustible gas, the occurrence of early thermal runaway can be judged according to the detection result, the lithium battery module in which the thermal runaway occurs can be rapidly positioned, and necessary conditions are created for timely fire extinguishing. The control device receives signals of the temperature sensor and the gas concentration detector, calculates the temperature rise rate, and can detect the voltage drop rate of the lithium battery module, so that the early thermal runaway can be judged conveniently through the voltage drop rate, the absolute temperature, the temperature rise rate and the gas concentration of the lithium battery module. In summary, the invention can monitor the state of the lithium battery module in various ways, and cool or extinguish the fire of the lithium battery module at the first time when thermal runaway occurs, thereby realizing active safety protection.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial block diagram of the present invention;

fig. 3 is a flow chart of the method of the present invention.

In the figure, 1-lithium battery module; 2-a temperature sensor; 3-a gas concentration detector; 4-a control device; 5-fire extinguishing agent storage tank; 6-a battery compartment; 7-a humidity sensor; 31-CO concentration detector; 32-H₂A concentration detector; 33-CH₄A concentration detector; 51-a pump group; 52-fire suppressant delivery conduit; 53-branched conduits; 54-a solenoid valve; 55-a nozzle; 56-fluid infusion device; 61-a ventilation device; 62-point type smoke detector.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Example 1:

as shown in fig. 1 and fig. 2, the active safety protection system for an energy storage battery station of the present embodiment includes a plurality of temperature sensors 2 and a plurality of gas concentration detectors 3 installed between adjacent lithium battery modules 1; the lithium battery module comprises a plurality of lithium battery modules 1, a plurality of temperature sensors 2 and a plurality of gas concentration detectors 3, and is characterized by further comprising a control device 4, wherein the plurality of lithium battery modules 1, the plurality of temperature sensors 2 and the plurality of gas concentration detectors 3 are all electrically connected with the control device 4; still include fire extinguishing agent storage tank 5, be connected with pump package 51 on the fire extinguishing agent storage tank 5, the exit linkage of pump package 51 has fire extinguishing agent pipeline 52, is connected with a plurality of branch pipelines 53 on the fire extinguishing agent pipeline 52, installs solenoid valve 54 on the branch pipeline 53, installs nozzle 55 on the lithium cell module 1, and in nozzle 55 stretched into lithium cell module 1, nozzle 55 passed through the pipeline and is connected with branch pipeline 53, and pump package 51 and solenoid valve 54 all are connected with controlling means 4 electricity.

According to the invention, the temperature sensor 2 is embedded in the gap between the lithium battery modules 1, so that the temperature sensor 2 can timely detect the temperature of high-heat gas released when the battery core of the lithium battery module 1 is out of control due to thermal runaway, and the gas concentration detector 3 can timely detect the concentration of combustible gas, thereby judging the occurrence of early thermal runaway according to the detection result and rapidly positioning the lithium battery module 1 in which the thermal runaway occurs, and creating necessary conditions for timely fire extinguishing. Controlling means 4 receives temperature sensor 2 and gas concentration detector 3's signal to calculate the temperature rise rate, controlling means 4 still can detect lithium battery module 1's voltage drop rate, thereby conveniently judges early thermal runaway through lithium battery module 1's 1 voltage drop rate, absolute temperature, temperature rise rate of lithium battery module 1 and gas concentration.

According to technical safety conditions of electric motor cars of Ministry of industry and State standards for safety requirements of power storage batteries for electric vehicles, the judgment of the thermal runaway state is generally based on the following conditions: when the following two and three occur simultaneously or the two and the three occur simultaneously, the thermal runaway is judged to occur: the temperature of a monitoring point reaches the maximum working temperature (generally 60 ℃) specified by a manufacturer; the voltage drop value of the battery exceeds the initial voltage by 25 percent; and thirdly, the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s.

The temperature sensor 2 is a fiber grating temperature measuring element or a thermistor sensor. The fiber grating temperature measuring element is used for measuring temperature, so that the remote monitoring of the measured signal is easy to realize. The fiber grating temperature measuring element has the advantages of good electrical insulation performance, good lightning stroke resistance, strong anti-electromagnetic interference capability, good long-term stability and high sensitivity.

Further, the gas concentration detector 3 includes a CO concentration detector 31, H₂Concentration detector 32, CH₄A concentration detector 33. The invention can measure the concentration of CO and H₂Concentration, CH₄Concentration all sets up one-level early warning threshold value and second grade alarm threshold value to set up the rule of judging thermal runaway or other trouble, promptly: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary alarm, it is judged that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module 1. Therefore, the invention can judge the thermal runaway of the energy storage battery through gas detection monitoring.

When the control device 4 receives an alarm signal of thermal runaway of the energy storage battery, the starting system releases the perfluorohexanone fire extinguishing agent to the battery pack with the thermal runaway, the continuous occurrence of the thermal runaway is inhibited through the cooling effect, and the concentration of combustible gas generated due to the thermal runaway in the battery pack is reduced through the inerting and suffocation effects.

The fire extinguishing agent used in the invention is perfluorohexanone fire extinguishing agent. The perfluorohexanone fire extinguishing agent belongs to fluorinated ketones and is a liquid fire extinguishing agent; and the storage tank does not belong to dangerous goods, no residue is left after release, the pressure of the storage tank is low during transportation, and the transportation and the storage are very convenient and stable. According to the research of a key laboratory of a large fire disaster in China, perfluorohexanone shows a good inhibition effect on the fire disaster of a lithium iron phosphate battery, and the inhibition effect on the fire disaster of the battery is obviously better than that of other fire extinguishing agents by absorbing heat through vaporization while blocking the internal reaction of the battery.

The invention also comprises a ventilation device 61 arranged on the battery chamber 6, and the ventilation device 61 is electrically connected with the control device 4. When the gas concentration detector 3 detects a combustible gas concentration alarm signal in the battery compartment 6, the signal is sent to the control device 4, and the control device 4 controls the ventilation device 61 to be started, so that the combustible gas concentration in the battery compartment 6 is reduced.

And a liquid supplementing interface is arranged on the fire extinguishing agent storage tank 5 and is connected with a liquid supplementing device 56 for supplementing the fire extinguishing agent. The fluid replacement device 56 may be a separate fire suppressant storage tank or a fire truck. When the fire extinguishing agent in the fire extinguishing agent storage tank 5 is insufficient, the liquid supplementing device 56 supplements the fire extinguishing agent to the fire extinguishing agent storage tank 5 through the liquid supplementing interface, and continuous fire extinguishing is guaranteed.

The invention also comprises a point type smoke detector 62 arranged in the battery chamber 6, and the point type smoke detector 62 is electrically connected with the control device 4. The point type smoke detector 62 can detect whether smoke exists in the battery compartment 6, and when the point type smoke detector 62 detects the smoke, the lithium battery module 1 is on fire. At this time, the solenoid valves 54 on all the branch pipes 53 can be controlled to open by the control device 4, so that the total flooding fire extinguishing protection is performed in the battery compartment 6.

And a humidity sensor 7 is also arranged between the adjacent lithium battery modules 1. Humidity transducer 7 can survey lithium battery module 1 surface humidity condition in real time to whether lithium battery module 1 is normal is judged through humidity to the convenience.

Example 2:

as shown in fig. 1 to fig. 3, the active safety protection method for an energy storage battery station of the present embodiment includes the following steps:

s1: detecting the absolute temperature of the lithium battery module 1; detecting the voltage drop rate of the lithium battery module 1;

s2: analyzing the temperature rise rate of the lithium battery module 1 according to the absolute temperature change of the lithium battery module 1;

s3: whether thermal runaway occurs in the lithium battery module 1 is judged, wherein the thermal runaway conditions comprise the following two conditions:

s31: the absolute temperature of the monitoring point reaches the maximum working temperature specified by a manufacturer, and the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

s32: the voltage drop value of the lithium battery module 1 exceeds 25% of the initial voltage, and the temperature rise rate of the monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

s4: when taking place thermal runaway, spray extinguishing agent to the inside electric core that takes place thermal runaway's lithium battery module 1.

The temperature sensor 2 can detect the absolute temperature of the lithium battery module 1, the control device 4 can analyze the temperature rise rate of the lithium battery module 1 after receiving the absolute temperature information, and the control device 4 can detect the voltage drop rate of the lithium battery module 1. Thereby according to above-mentioned data information, the system can implement the monitoring lithium cell module 1 and whether take place the thermal runaway, guarantees the very first time and finds the thermal runaway and cools off or put out a fire corresponding lithium cell module 1, reduces the loss.

Temperature sensor 2 direct mount is between adjacent lithium battery module 1, and then the temperature variation when lithium battery module 1 takes place the thermal runaway can be in time discover. When spraying fire extinguishing agent to lithium battery module 1, nozzle 55 stretches into inside lithium battery module 1 to in time cool off or put out a fire, improve cooling or fire control effect to electric core.

The invention also comprises the following steps:

t1: detect CO concentration, H of lithium cell module 1 department₂Concentration, CH₄Concentration;

t2: for detected CO concentration, H₂Concentration, CH₄Setting a primary early warning threshold and a secondary early warning threshold for the concentration;

t3: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary warning, judging that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module 1;

t4: when step T3 takes place, spray extinguishing agent to the inside electric core that takes place thermal runaway lithium battery module 1.

The invention can measure the concentration of CO and H₂Concentration, CH₄Concentration all sets up one-level early warning threshold value and second grade alarm threshold value to set up the rule of judging thermal runaway or other trouble, promptly: when the concentration of CO is H₂Concentration, CH₄When any two of the concentrations have primary early warning or any one of the concentrations has secondary alarm, it is judged that one or more of a plurality of faults including thermal runaway occur in the battery core in the lithium battery module 1. Therefore, the invention can judge the thermal runaway of the energy storage battery through gas detection monitoring. When gas concentration reaches alarm state, can trigger controlling means 4 to controlling means 4 control relevant position's nozzle 55 cools off or puts out a fire lithium cell module 1's electric core.

In step T2, CO concentration, H₂Concentration, CH₄When any one of the concentrations exceeds a corresponding primary early warning threshold value, an early warning signal is sent out, and the concentration of CO and the concentration of H are₂Concentration, CH₄And when any one of the concentrations exceeds the corresponding secondary alarm threshold value, an alarm signal is sent out. CO concentration detector 31, H₂Concentration detector 32, CH₄The concentration detectors 33 detect gas between adjacent lithium battery modules 1 in the battery pack, so that gas released when the lithium battery modules 1 are out of control due to heat or other faults can be detected at the first time, and the response of gas detection is fast. The position of the lithium battery module 1 with thermal runaway or other faults can be accurately judged through early warning or alarm sent by the gas concentration detector 3 at the corresponding position, and necessary conditions are provided for processing the thermal runaway or faults.

The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.