Lithium Battery Thermal Runaway Fire Detection and Fire Sensitivity Testing Method and System

Abstract

The present invention discloses a method and system for detecting lithium battery thermal runaway fire and testing the fire sensitivity. The method includes: if a test start message is received, a start instruction is sent to a generating device to generate a fire environment, the test environment monitoring data collected by a data acquisition device is obtained and sent to a display device for display, and it is determined whether the test environment monitoring data matches preset detection conditions; if it matches, the detection result of the device under test is obtained. The above method can comprehensively detect the test environment monitoring data including temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data and ion concentration monitoring data and determine whether it matches the detection conditions, so that the device under test is in a set environment, and the device under test is accurately and comprehensively tested by simulating the real field environment, improving the efficiency of testing the fire detection sensitivity of the device under test.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent testing, and particularly to a method and system for detecting lithium battery thermal runaway fires and testing fire sensitivity. Background Art

[0002] With the continuous expansion of the application scale of the new energy industry, lithium batteries are prone to deformation due to external forces such as puncturing and extrusion during use, or the internal separator of the battery core may be dissolved due to an external overheating environment; incorrect usage methods such as overcharging and over-discharging will also induce the generation of dendrites inside the battery and pierce the separator. These inducements will all cause internal short-circuit heat generation in the battery and then thermal runaway. To avoid serious damages such as fires caused by battery failures, a fire detection alarm needs to be assembled on the battery side; in order to enable the fire detection alarm to accurately detect a fire in a timely manner when the battery is abnormal, it is necessary to test the sensitivity of the detector under fire conditions through a testing method to ensure that the fire detection alarm meets the actual usage requirements.

[0003] The prior art usually uses a large standard smoke chamber combined with a heating device to conduct smoke tests on the device under test. When testing the gas concentration, a traditional gas mixing test chamber, a gas analyzer, and a heating device need to be combined and used. Multiple different test platforms need to be built to conduct multi-faceted tests on the product. Since the test conditions of different test platforms are different, the data obtained from the tests is quite different, and it is impossible to accurately and comprehensively test the fire detection sensitivity of the device under test. Therefore, there is a problem in the prior art method that the fire detection sensitivity of the device under test cannot be accurately and comprehensively tested. Summary of the Invention

[0004] An embodiment of the present invention provides a method and system for detecting lithium battery thermal runaway fires and testing fire sensitivity, aiming to solve the problem in the prior art method that the fire detection sensitivity of the device under test cannot be accurately and comprehensively tested.

[0005] In a first aspect, an embodiment of the present invention provides a method for detecting lithium battery thermal runaway fires and testing fire sensitivity. This method is applied to a test terminal of a lithium battery thermal runaway fire detection and fire sensitivity test system. The test terminal is communicatively connected to a data acquisition device, a generating device, a display device, and the device under test; the data acquisition device and the generating device are both arranged in a sealed box, and the sealed box is connected to a sealed battery placement box through an air supply pipeline and a return air pipeline to form an air flow circulation loop; the device under test is placed on a sample experiment platform in the sealed box or arranged in the return air pipeline, and a tray for placing a battery or electrolyte is arranged in the generating device. The method includes:

[0006] If the input test start information is received, a corresponding start instruction is sent to the generating device to control the generating device to generate a fire environment;

[0007] Obtain the test environment monitoring data collected by the data collection device and send it to the display device for display; the test environment monitoring data includes temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data, and ion concentration monitoring data;

[0008] Judge whether the test environment monitoring data matches the preset detection conditions;

[0009] If the test environment monitoring data matches the detection conditions, obtain the detection result of the device under test.

[0010] In a second aspect, an embodiment of the present invention further provides a lithium battery thermal runaway fire detection and fire sensitivity test system. The lithium battery thermal runaway fire detection and fire sensitivity test method described in the first aspect above is applied to a test terminal in the test system. The test system further includes a sealed box, a battery placement box, and a display device; a data collection device and a generating device are arranged in the sealed box; the test terminal is communicatively connected to the data collection device, the generating device, the display device, and the device under test;

[0011] The sealed box is communicated with the battery placement box through an air supply pipeline and a return air pipeline to form an air flow circulation loop; the device under test is placed on the sample experiment platform of the sealed box or arranged in the return air pipeline, and a tray for placing a battery or electrolyte is arranged in the generating device;

[0012] The generating device further includes an ignition electronic control device, an igniter, a heating driving device, and a heater; the ignition electronic control device is electrically connected to the igniter, and the heating driving device is electrically connected to the heater;

[0013] The generating device further includes an air flow control device, and the air flow control device is arranged on one side of the tray facing the through hole at the end of the air supply pipeline.

[0014] An embodiment of the present invention provides a method and system for detecting lithium battery thermal runaway fires and testing fire sensitivity. The method includes: if a test start message is received, a start command is sent to a generating device to create a fire environment, the test environment monitoring data collected by a data acquisition device is obtained and sent to a display device for display, and it is determined whether the test environment monitoring data matches preset detection conditions; if it matches, the detection result of the device under test is obtained. The above method can comprehensively detect test environment monitoring data including temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data, and ion concentration monitoring data, and determine whether it matches the detection conditions, so that the device under test is in a set environment, and by simulating a real on-site environment, an accurate and comprehensive test of the device under test is achieved, greatly improving the efficiency of testing the fire detection sensitivity of the device under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is a flowchart of the method for detecting lithium battery thermal runaway fires and testing fire sensitivity provided by the embodiment of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the system for detecting lithium battery thermal runaway fires and testing fire sensitivity provided by the embodiment of the present invention;

[0018] Figure 3 It is a structural diagram of the sealed box in the system for detecting lithium battery thermal runaway fires and testing fire sensitivity provided by the embodiment of the present invention;

[0019] Figure 4 It is a structural diagram of the battery placement box in the system for detecting lithium battery thermal runaway fires and testing fire sensitivity provided by the embodiment of the present invention;

[0020] Figure 5 It is a structural diagram of the display device in the system for detecting lithium battery thermal runaway fires and testing fire sensitivity provided by the embodiment of the present invention;

[0021] Figure 6 It is a schematic block diagram of the computer device provided by the embodiment of the present invention;

[0022] Reference Numerals: 1, test terminal; 2, sealed box; 3, battery placement box; 4, display device; 31, gas supply pipeline; 32, gas return pipeline; 311, gas supply interface; 321, gas reflux interface; 33, main intake pipe; 331, main valve; 312, main intake interface; 34, battery cluster bracket; 341, sealed cavity; 342, sealed box intake valve; 35, gas sampling pipe; 343, sealed box outlet valve; 322, sampling interface; 36, suction detection cavity; 323, gas return interface; 22, tray; 23, data acquisition device; 231, thermometer; 232, ion concentration meter; 233, optical density meter; 234, carbon monoxide density meter; 235, carbon dioxide density meter; 236, hydrogen density meter; 21, generating device; 211, ignition electronic control device; 212, igniter; 213, heating drive device; 214, heater; 201, left box body; 202, right box body; 203, area isolation screen; 24, sample experiment platform; 25, air flow control device; 26, camera; 42, carbon monoxide data display module; 43, carbon dioxide data display module; 44, hydrogen data display module; 45, smoke concentration data display module; 46, ion concentration data display module; 47, temperature data display module; 41, system software general display; 10, device under test. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0025] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0026] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] Please refer to Figure 1 , as shown in the figure, an embodiment of the present invention application provides a method for detecting lithium battery thermal runaway fire and testing fire sensitivity, which is applied to the test terminal 1 of the lithium battery thermal runaway fire detection and fire sensitivity test system, and this method is executed through the application software installed in the test terminal 1. The specific application scenario is as Figure 2 shown. The test terminal 1 is communicatively connected to the data acquisition device 23, the generating device 21, the display device 4, and the device under test 10. The test terminal 1 is a terminal device with functions of monitoring data acquisition, instruction sending and receiving, and data processing, such as a desktop computer, a notebook computer, a tablet computer, or a mobile phone, etc. As Figure 1 shown, this method includes steps S110 to S140.

[0028] S110. If the input test start information is received, send a corresponding start instruction to the generating device to control the generating device to generate a fire environment.

[0029] If the input test start information is received, send a corresponding start instruction to the generating device to control the generating device to generate a fire environment. The tester can input the test start information into the test terminal, and the test terminal then sends a corresponding start instruction to the generating device according to the test start information, and the generating device is used to generate a fire environment.

[0030] In a specific embodiment, step S110 includes sub-steps: If the start instruction is a battery runaway test instruction, send a heating control instruction to the heating drive device to drive the heater to heat the battery placed in the tray through the heating drive device; if the start instruction is a fire sensitivity test instruction, send an ignition control instruction to the ignition electronic control device to drive the igniter to ignite the electrolyte placed in the tray through the ignition electronic control device.

[0031] Specifically, the type of the start instruction can be determined. If the start instruction is a battery out-of-control test instruction, a heating instruction is sent to the heating drive device. A drive circuit for driving the heater is provided in the heating drive device. The heating drive device outputs current to drive the heater to heat. At this time, the heater can heat the battery placed in the tray. The battery gets out of control due to heat and catches fire. At this time, a large amount of combustion products such as smoke, carbon monoxide, and carbon dioxide are generated, and the surrounding temperature also rises. If the start instruction is a fire sensitivity test instruction, a telephone control instruction is sent to the ignition electronic control device. The ignition electronic control device outputs a high voltage to the igniter. The igniter uses the high voltage to generate an arc to ignite the electrolyte placed in the tray. At this time, combustion products such as smoke, carbon monoxide, and carbon dioxide are also generated, and the surrounding temperature also rises. Various toxic and harmful gases such as hydrogen and carbon monoxide enter the battery placement box through the connected pipelines, so as to simulate the real working environment of the lithium battery.

[0032] In the specific embodiment, step S110 further includes the step of: sending an air flow conveying instruction to the air flow control device to control the air flow control device to work and stir the gas in the sealed box. Before sending the heating control instruction or the ignition control instruction, an air flow conveying instruction can be sent to the air flow control device first. The air flow control device can be a fan. When the air flow control device receives the air flow conveying instruction, it starts to work. The gas in the sealed box can be stirred through the air flow control device to make the gas inside the sealed box uniform.

[0033] S120. Obtain the test environment monitoring data collected by the data acquisition device and send it to the display device for display.

[0034] Obtain the test environment monitoring data collected by the data acquisition device and send it to the display device for display. The test environment monitoring data can be collected by the data acquisition device and the obtained test environment monitoring data is sent to the display device for display. Among them, the test environment monitoring data includes temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data, and ion concentration monitoring data.

[0035] S130. Judge whether the test environment monitoring data matches the preset detection conditions.

[0036] Judge whether the test environment monitoring data matches the preset detection conditions. Further, it can be judged whether the test environment monitoring data matches the detection conditions, that is, it is judged whether the test environment monitoring data meets the corresponding detection conditions, so as to judge whether the current test environment can truly simulate the fire environment generated by the actual lithium battery.

[0037] In a specific embodiment, step S130 includes sub-steps: determining whether each value in the test environment monitoring data is within the corresponding preset value range in the detection conditions, so as to determine whether the test environment monitoring data matches the detection conditions.

[0038] The test environment monitoring data contains multiple values, and the detection conditions contain a preset value range corresponding to each value. It can be determined whether each value in the test environment monitoring data is within the corresponding preset value range. If each value is within the corresponding preset value range, it is determined that the test environment monitoring data matches the detection conditions; if any one of the values is not within the corresponding preset value range, it is determined that the test environment monitoring data does not match the detection conditions.

[0039] In a specific embodiment, determining whether each value in the test environment monitoring data is within the corresponding preset value range in the detection conditions includes: obtaining the preset value range corresponding to each value and the test duration in the test environment monitoring data from each standard curve in the detection conditions; determining whether the values collected at the current time point are within the corresponding preset value ranges.

[0040] Specifically, the detection conditions contain multiple standard curves. Each standard curve is a curve obtained by detecting a certain value in the real fire environment of a lithium battery. The abscissa of the standard curve is time (starting from the time when the battery operation becomes abnormal), and the ordinate is the corresponding value. Then, the standard curve in the detection conditions that matches each value can be obtained, and according to the test duration (using the interval between the start command and the current time point as the test duration), the point corresponding to the test duration in the matching standard curve is obtained, and the value range corresponding to this point in the standard curve is obtained as the preset value range corresponding to one value. Determine whether the values collected at the current time point are all within the preset value range obtained through the above steps, so as to obtain the determination result of whether the test environment monitoring data matches the detection conditions. Through this technical method, it is possible to more accurately determine whether the test environment monitoring data obtained at each time point during the test matches the real fire environment, thereby making the obtained test results more accurate.

[0041] S140. If the test environment monitoring data matches the detection conditions, obtain the detection result of the device under test.

[0042] If the test environment monitoring data matches the detection conditions, obtain the detection result of the device under test. Further, if the test environment monitoring data matches the detection conditions, the detection data collected by the device under test during the entire test process can be obtained as the detection result of the device under test. By statistically analyzing the detection result, it can be determined whether the device under test passes the test.

[0043] In the lithium battery thermal runaway fire detection and fire sensitivity test method disclosed in the above embodiment, the method includes: if a test start message is received, a start command is sent to the generating device to generate a fire environment, the test environment monitoring data collected by the data acquisition device is obtained and sent to the display device for display, and it is determined whether the test environment monitoring data matches the preset detection conditions; if it matches, the detection result of the device under test is obtained. The above method can comprehensively detect the test environment monitoring data including temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data, and ion concentration monitoring data and determine whether it matches the detection conditions, so that the device under test is in a set environment, and the device under test can be accurately and comprehensively tested by simulating the real field environment, greatly improving the efficiency of testing the fire detection sensitivity of the device under test.

[0044] An embodiment of the present invention further provides a lithium battery thermal runaway fire detection and fire sensitivity test system. Any one of the embodiments of the lithium battery thermal runaway fire detection and fire sensitivity test method described above is applied to the test terminal in the test system. Specifically, please refer to Figures 2 to 5 .

[0045] As Figure 2 and Figure 3 shown, the test system further includes a sealed box 2, a battery placement box 3, and a display device 4; a data acquisition device 23 and a generating device 21 are arranged in the sealed box 2; the test terminal 1 is communicatively connected to the data acquisition device 23, the generating device 21, the display device 4, and the device under test; the sealed box 2 is communicated with the battery placement box 3 through an air supply pipeline 31 and a return air pipeline 32 to form an air flow circulation loop; the device under test is placed on the sample experiment platform 24 of the sealed box 2 or arranged in the return air pipeline 32, and a tray 22 for placing a battery or electrolyte is arranged in the generating device 21; the generating device 21 further includes an ignition electronic control device 211, an igniter 212, a heating drive device 213, and a heater 214; the ignition electronic control device 211 is electrically connected to the igniter 212, and the heating drive device 213 is electrically connected to the heater 214; the generating device 21 further includes an air flow control device 25, and the air flow control device 25 is arranged on one side of the tray 22 facing the through hole at the end of the air supply pipeline 31.

[0046] In a more specific embodiment, as Figure 3 shown, the data acquisition device 23 includes a thermometer 231, an ion concentration meter 232, an optical density meter 233, a carbon monoxide density meter 234, a carbon dioxide density meter 235, and a hydrogen density meter 236 that are dispersedly arranged in the sealed box 2. Further, the sealed box 2 includes a box body and a regional isolation screen 203 arranged in the box body; the regional isolation screen 203 divides the sealed cavity in the box body into a left box body 201 and a right box body 202; the igniter 212, the heating drive device 213, the heater 214, the tray 22, and the air flow control device 25 are all arranged in the left box body 201; the sample experiment platform 24, the thermometer 231, the ion concentration meter 232, the optical density meter 233, the carbon monoxide density meter 234, the carbon dioxide density meter 235, and the hydrogen density meter 236 are all arranged in the right box body 202; the heater 214 is arranged above the heating drive device 213, the tray 22 is arranged above the heater 214, the igniter 212 is arranged above the tray 22, and the air flow control device 25 is arranged on one side of the tray 22 away from the igniter 212; a gas return interface 321 connected to the return gas pipeline 32 is provided on the side wall of the left box body 201 above the tray 22; the sample experiment platform 24 is arranged at one end of the right box body 202 away from the regional isolation screen 203; an air supply interface 311 connected to the air supply pipeline 31 is provided on the side wall of the right box body 202 above the regional isolation screen 203.

[0047] By providing the regional isolation screen 203 to divide the sealed cavity in the box body into the left box body 201 and the right box body 202, the left box body 201 can be used to heat the battery or ignite the electrolyte to generate a fire environment. The regional isolation screen 203 can separate the fire environment on one side of the left box body 201 from the right box body 202 and ensure that the air flow can smoothly flow into the right box body 202. The battery may explode during combustion, and the electrolyte may also splash during combustion. Setting the regional isolation screen 203 can isolate the solids generated by the explosion and the splashing liquid, preventing the solids from damaging the detector or the liquid from seeping into the detector, resulting in inaccurate detection values or interrupted detection; that is, ensuring that each detector can operate reliably, so as to be able to completely obtain accurate test environment monitoring data.

[0048] Among them, the thermometer 231 can adopt a K-type armored thermocouple with a temperature range of 0 to 600 °C; the optical density meter 233 can measure the light extinction rate, with a light extinction rate measurement range of 0 to 100%, and an m value measurement range of. The ion concentration meter 232 consists of a smoke optical density emission component and a receiving component with a range of 0 to 3 dB / m; the measurement resolution of the carbon monoxide density meter 234 is 1 ppm, and the measurement range is 0 to 2000 ppm; the measurement resolution of the carbon dioxide density meter 235 is 1 ppm, and the measurement range is 0 to 1000 ppm.

[0049] Furthermore, a camera 26 can be arranged in the right box body 202, and a communication connection is established between the camera 26 and the test terminal 1. Then, the internal monitoring images collected by the camera 26 can be actually displayed on the display device 4.

[0050] In a more specific embodiment, as Figure 4 shown, a battery cluster bracket 34 is arranged in the battery placement box 3; the battery cluster bracket 34 divides the internal cavity of the battery placement box 3 into a plurality of independent sealed cavities 341; a total intake pipe 33 and a gas sampling pipe 35 are respectively arranged on both sides of the battery placement box 3; one end of the total intake pipe 33 serves as a total intake interface 312 to communicate with the gas transmission pipeline 31, and the other end communicates with each of the sealed cavities 341; a total valve 331 is arranged at one end of the total intake pipe 33 located at the total intake interface 312; an intake valve of the sealed box 2 is arranged at each end of the total intake pipe 33 communicating with the sealed cavity 341; one end of the gas sampling pipe 35 communicates with the sampling interface 322 of the gas detection cavity, and the other end communicates with each of the sealed cavities 341. An outlet valve of the sealed box 2 is arranged at each end of the gas sampling pipe 35 communicating with the sealed cavity 341; the gas return interface 323 of the gas detection cavity communicates with the gas return pipeline 32.

[0051] A group of batteries can be placed in each sealed cavity 341. The toxic and harmful gases generated by the generating device 21 pass through the area isolation screen 203 and enter the right box body 202. The toxic and harmful gases enter the gas transmission pipeline 31 through the gas transmission interface 311 on the right box body 202 and flow to the total intake pipe 33. The total intake pipe 33 guides the toxic and harmful gases to each sealed cavity 341. After the gas passes through the batteries arranged in the sealed cavity 341, it enters the gas detection cavity through the gas sampling pipe 35, and after passing through the gas detection cavity, it flows back to the gas return interface 321 through the gas return pipeline 32, thereby constructing an air flow circulation loop.

[0052] In a more specific embodiment, as Figure 5As shown, the display device 4 includes a carbon monoxide data display module 42, a carbon dioxide data display module 43, a hydrogen data display module 44, a smoke concentration data display module 45, an ion concentration data display module 46, a temperature data display module 47, and a system software general display 41.

[0053] To improve the display effect, different display modules can be set to display different data information respectively.

[0054] In the test terminal of the lithium battery thermal runaway fire detection and fire sensitivity test system provided by the embodiments of the present invention, the above-mentioned lithium battery thermal runaway fire detection and fire sensitivity test method is applied. If a test start message is received, a start command is sent to the generating device to generate a fire environment, the test environment monitoring data collected by the data acquisition device is obtained and sent to the display device for display, and it is judged whether the test environment monitoring data matches the preset detection conditions; if it matches, the detection result of the device under test is obtained. The above method can comprehensively detect the test environment monitoring data including temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data, and ion concentration monitoring data, and judge whether it matches the detection conditions, so that the device under test is in the set environment, and the device under test is accurately and comprehensively tested by simulating the real field environment, greatly improving the efficiency of testing the fire detection sensitivity of the device under test.

[0055] The above-mentioned lithium battery thermal runaway fire detection and fire sensitivity test method can be implemented in the form of a computer program, and this computer program can run on a computer device as shown in Figure 6 Then, the test terminal can be implemented as a computer device as shown in Figure 6 shown.

[0056] Please refer to Figure 6 , Figure 6 is a schematic block diagram of the computer device provided by the embodiments of the present invention. This computer device can be a test terminal for executing the lithium battery thermal runaway fire detection and fire sensitivity test method to test the fire detection sensitivity of the device under test.

[0057] Refer to Figure 6 , the computer device 500 includes a processor 502, a memory, and a network interface 505 connected through a communication bus 501. Among them, the memory can include a storage medium 503 and an internal memory 504.

[0058] The storage medium 503 can store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, it can cause the processor 502 to execute a method for detecting thermal runaway fires of lithium batteries and testing fire sensitivity. Among them, the storage medium 503 can be a volatile storage medium or a non-volatile storage medium.

[0059] The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500.

[0060] The internal memory 504 provides an environment for the operation of the computer program 5032 in the storage medium 503. When the computer program 5032 is executed by the processor 502, it can cause the processor 502 to execute a method for detecting thermal runaway fires of lithium batteries and testing fire sensitivity. [[ID=...]]

[0061] The network interface 505 is used for network communication, such as providing the transmission of data information, etc. Those skilled in the art can understand that Figure 6 The structure shown in is only a block diagram of some structures related to the solution of the present invention, and does not constitute a limitation on the computer device 500 to which the solution of the present invention is applied. The specific computer device 500 may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0062] Among them, the processor 502 is used to run the computer program 5032 stored in the memory to implement the corresponding functions in the above-mentioned method for detecting thermal runaway fires of lithium batteries and testing fire sensitivity.

[0063] Those skilled in the art can understand that Figure 6 The embodiments of the computer device shown in do not constitute a limitation on the specific composition of the computer device. In other embodiments, the computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements. For example, in some embodiments, the computer device may only include a memory and a processor. In such an embodiment, the structures and functions of the memory and the processor are the same as those in Figure 6 the embodiment shown, and will not be elaborated here.

[0064] It should be understood that in the embodiments of the present invention, the processor 502 may be a central processing unit (CPU), and the processor 502 may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0065] In another embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium may be a volatile or non-volatile computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps included in the above-mentioned lithium battery thermal runaway fire detection and fire sensitivity test method are implemented.

[0066] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the above-described devices, apparatuses, and units can refer to the corresponding processes in the foregoing method embodiments and will not be described herein again. Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to their functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0067] In several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. Units with the same function may also be integrated into a single unit. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the displayed or discussed couplings, direct couplings, or communication connections to each other may be indirect couplings or communication connections through some interfaces, devices, or units, and may also be electrical, mechanical, or other forms of connection.

[0068] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention.

[0069] In addition, each functional unit in various embodiments of the present invention may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0070] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned computer-readable storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), magnetic disks, or optical discs that can store program codes.

[0071] As mentioned above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for detecting thermal runaway fire of a lithium battery and testing the fire sensitivity, characterized in that, The method is applied to a test terminal of a lithium battery thermal runaway fire detection and fire sensitivity test system. The test terminal is communicatively connected to a data acquisition device, a generating device, a display device, and a device under test; the data acquisition device and the generating device are both arranged in a sealed box, and the sealed box is communicated with a sealed battery placement box through an air delivery pipeline and a return air pipeline to form an air flow circulation loop; the device under test is placed on a sample experiment platform of the sealed box or arranged in the return air pipeline, a tray for placing a battery or electrolyte is arranged in the generating device, and a battery cluster support is arranged in the battery placement box; the battery cluster support divides the internal cavity of the battery placement box into multiple independent sealed cavities, and a group of batteries are placed in each sealed cavity. A total air inlet pipe and a gas sampling pipe are respectively arranged on two sides of the battery placement box; one end of the total air inlet pipe serves as a total air inlet interface to communicate with the air delivery pipeline, and the other end communicates with each sealed cavity; a total valve is arranged at one end of the total air inlet pipe located at the total air inlet interface; a sealed box air inlet valve is arranged at each end of the total air inlet pipe communicating with the sealed cavity. One end of the gas sampling pipe communicates with a sampling interface of a gas detection cavity, and the other end communicates with each sealed cavity. A sealed box air outlet valve is arranged at each end of the gas sampling pipe communicating with the sealed cavity; a return air interface of the gas detection cavity communicates with the return air pipeline. The method includes: If the input test start information is received, a corresponding start instruction is sent to the generating device to control the generating device to generate a fire environment. The test environment monitoring data collected by the data acquisition device is obtained and sent to the display device for display; the test environment monitoring data includes temperature monitoring data, carbon monoxide concentration monitoring data, carbon dioxide concentration monitoring data, hydrogen concentration monitoring data, smoke concentration monitoring data, and ion concentration monitoring data. It is judged whether the test environment monitoring data matches preset detection conditions. If the test environment monitoring data matches the detection conditions, the detection result of the device under test is obtained. The generating device includes an ignition electronic control device, an igniter, a heating driving device, and a heater. The ignition electronic control device is electrically connected to the igniter, and the heating driving device is electrically connected to the heater. Sending the corresponding start instruction to the generating device includes: If the start instruction is a battery runaway test instruction, a heating control instruction is sent to the heating driving device to drive the heater to heat the battery placed in the tray through the heating driving device. If the start instruction is a fire sensitivity test instruction, an ignition control instruction is sent to the ignition electronic control device to drive the igniter to ignite the electrolyte placed in the tray through the ignition electronic control device.

2. The method for detecting thermal runaway fire of a lithium battery and testing fire sensitivity according to claim 1, wherein The generating device further includes an air flow control device, and the air flow control device is arranged on one side of the tray facing the through hole at the end of the air delivery pipeline. The method further includes: Send an air flow transportation instruction to the air flow control device to control the operation of the air flow control device and stir the gas in the sealed box.

3. The method for detecting thermal runaway fire and testing fire sensitivity of a lithium battery according to claim 1, wherein The determination of whether the test environment monitoring data matches the preset detection conditions further includes: Judging whether each value in the test environment monitoring data is within the corresponding preset value range in the detection conditions to determine whether the test environment monitoring data matches the detection conditions.

4. The method for detecting thermal runaway fire and testing fire sensitivity of a lithium battery according to claim 3, characterized in that The judgment of whether each value in the test environment monitoring data is within the corresponding preset value range in the detection conditions includes: Obtain the preset value range corresponding to each value and the test duration in the test environment monitoring data from each standard curve of the detection conditions; Judge whether the values collected at the current time point are within the corresponding preset value ranges.

5. A lithium battery thermal runaway fire detection and fire sensitivity test system, characterized in that, The test terminal in the test system applies the lithium battery thermal runaway fire detection and fire sensitivity test method according to any one of claims 1-4. The test system further includes a sealed box, a battery placement box and a display device; a data acquisition device and a generating device are arranged in the sealed box; the test terminal is communicatively connected to the data acquisition device, the generating device, the display device and the device under test; The sealed box is communicated with the battery placement box through an air delivery pipeline and a return air pipeline to form an air flow circulation loop; the device under test is placed on the sample experiment platform in the sealed box or arranged in the return air pipeline, and a tray for placing a battery or electrolyte is arranged in the generating device; The generating device further includes an ignition electronic control device, an igniter, a heating driving device and a heater; the ignition electronic control device is electrically connected to the igniter, and the heating driving device is electrically connected to the heater; The generating device further includes an air flow control device, and the air flow control device is arranged on one side of the tray facing the through hole at the end of the air delivery pipeline.

6. The lithium battery thermal runaway fire detection and fire sensitivity test system according to claim 5, characterized in that, The data acquisition device includes a thermometer, an ion concentration meter, an optical density meter, a carbon monoxide density meter, a carbon dioxide density meter and a hydrogen density meter which are dispersedly arranged in the sealed box.

7. The lithium battery thermal runaway fire detection and fire sensitivity test system according to claim 6, characterized in that, The sealed box includes a box body and a regional isolation screen arranged in the box body; the regional isolation screen divides the sealed cavity in the box body into a left box body and a right box body; the igniter, the heating driving device, the heater, the tray and the air flow control device are all arranged in the left box body; the sample experiment platform, the thermometer, the ion concentration meter, the optical density meter, the carbon monoxide density meter, the carbon dioxide density meter and the hydrogen density meter are all arranged in the right box body; The heater is arranged above the heating driving device, the tray is arranged above the heater, the igniter is arranged above the tray, and the air flow control device is arranged on one side of the tray away from the igniter; a gas return interface connected to the return air pipeline is provided on the side wall above the tray in the left box body; The sample experimental platform is arranged at one end of the right box body far away from the area isolation screen; an air inlet interface connected to the air pipeline is provided on the side wall above the area isolation screen in the right box body.

8. The lithium battery thermal runaway fire detection and fire sensitivity test system according to claim 5, characterized in that The display device includes a carbon monoxide data display module, a carbon dioxide data display module, a hydrogen data display module, a smoke concentration data display module, an ion concentration data display module, a temperature data display module, and a system software general display.

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