Thermal runaway test system

Abstract

The invention discloses a thermal runaway test system, and relates to the field of battery detection, and the system comprises a sample table which is located in a battery cell-module thermal runaway diffusion test sealing tank and is used for placing a battery to be detected; the environment heating device, the humidity regulation and control device, the needling device and the gas regulation and control device are all connected with the battery cell-module thermal runaway diffusion test sealing tank; the external heating device, the charging and discharging device and the short circuit device are all connected with the battery to be detected; an exhaust hole is formed in the tank wall of the battery cell-module thermal runaway diffusion test sealing tank, the exhaust switch is located in the exhaust hole, the gas collecting device is communicated with the interior of the battery cell-module thermal runaway diffusion test sealing tank through the exhaust switch, and the accuracy of a thermal runaway test result can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery testing, and in particular to a thermal runaway testing system. Background Art

[0002] Thermal runaway refers to the phenomenon that due to certain reasons, the heat generation rate inside the battery is greater than the heat dissipation rate, causing the battery temperature to continue to rise, triggering a series of violent chemical reactions, which may eventually lead to serious consequences such as battery fire and explosion.

[0003] The operating conditions of batteries when thermal runaway occurs are quite diverse and complex. However, currently, thermal runaway experiments can only be triggered by a single operating condition, which makes the test results of thermal runaway not accurate enough. Summary of the invention

[0004] The purpose of this application is to provide a thermal runaway test system that can improve the accuracy of thermal runaway test results.

[0005] To achieve the above objectives, this application provides the following solutions: The present application provides a thermal runaway test system, the thermal runaway test system comprising: Cell-module thermal runaway diffusion test sealed tank, sample table, gas collection device, thermal runaway device and controller; The thermal runaway device includes the following devices: an environmental heating device, a humidity control device, a needle puncture device, an external heating device, a charging and discharging device, a short circuit device and a gas control device; Wherein, the sample stage is located inside the battery cell-module thermal runaway diffusion test sealed tank, and the sample stage is used to place the battery to be tested; The environmental heating device, the humidity control device, the acupuncture device and the gas control device are all connected to the battery cell-module thermal runaway diffusion test sealing tank; The external heating device, the charging and discharging device and the short-circuiting device are all connected to the battery to be tested; An exhaust hole is provided on the tank wall of the battery cell-module thermal runaway diffusion test sealed tank, an exhaust switch is located in the exhaust hole, and the gas collection device is connected to the interior of the battery cell-module thermal runaway diffusion test sealed tank through the exhaust switch.

[0006] According to the specific embodiments provided in this application, this application discloses the following technical effects: The present application provides a thermal runaway test system, which includes: a battery cell-module thermal runaway diffusion test sealed tank, a sample table, a gas collecting device, a thermal runaway device and a controller; the thermal runaway device includes the following devices: an environmental heating device, a humidity control device, a puncture device, an external heating device, a charge and discharge device, a short-circuit device and a gas control device; wherein the sample table is located inside the battery cell-module thermal runaway diffusion test sealed tank, and the sample table is used to place the battery to be tested; the environmental heating device, the humidity control device, the puncture device and the gas control device are all connected to the battery cell-module thermal runaway diffusion test sealed tank; the external heating device, the charge and discharge device and the short-circuit device are all connected to the battery to be tested; an exhaust hole is opened on the tank wall of the battery cell-module thermal runaway diffusion test sealed tank, the exhaust switch is located in the exhaust hole, and the gas collecting device is connected to the inside of the battery cell-module thermal runaway diffusion test sealed tank through the exhaust switch. In the present disclosure, there are multiple thermal runaway devices, multiple triggering modes such as acupuncture, external heating, overcharge / overdischarge, external short circuit, etc., and environmental requirements such as high temperature and high humidity, so that multiple thermal runaway triggering modes can be realized, and multiple scenarios can restore the thermal runaway-propagation threshold scenario under real working conditions. Through the coupling interaction between different thermal runaway devices, complex and changeable battery usage scenarios can be met, and actual working conditions can be better simulated, so that the test results of thermal runaway are more accurate and closer to real working conditions, and the test results are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 is a schematic diagram of a thermal runaway test system according to an exemplary embodiment. Figure 1 ; Figure 2 is a schematic diagram of a thermal runaway test system according to an exemplary embodiment. Figure 2 ; Figure 3 is a cross-sectional schematic diagram of a thermal runaway test system according to an exemplary embodiment; Figure 4 A schematic diagram of a thermal runaway testing method provided in one embodiment of the present application; Figure 5 A schematic diagram of the structure of a computer device provided in one embodiment of the present application.

[0009] Description of reference numerals: 1-Battery cell-module thermal runaway diffusion test sealed tank; 2-sample table; 3-gas collection device; 41-environmental heating device; 42-humidity control device; 43-acupuncture device; 44-external heating device; 45-charging and discharging device; 46-short-circuit device; 47-gas control device. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0011] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0012] Thermal runaway refers to the phenomenon that due to certain reasons, the heat generation rate inside the battery is greater than the heat dissipation rate, causing the battery temperature to continue to rise, triggering a series of violent chemical reactions, which may eventually lead to serious consequences such as battery fire and explosion.

[0013] Thermal runaway may cause battery fires and explosions, posing a serious threat to life and property. In the fields of electric vehicles and energy storage systems, thermal runaway accidents may cause larger-scale fires and explosions, posing a major challenge to public safety. Thermal runaway accidents can also cause battery damage, requiring replacement of batteries, increasing the cost of use. For large-scale energy storage system and electric vehicle manufacturers, thermal runaway accidents may lead to product recalls, compensation for losses, etc., bringing huge economic pressure to the company.

[0014] Therefore, the thermal runaway process is usually simulated through experiments to evaluate the conditions of thermal runaway, optimize battery design, improve battery management, and thus avoid the occurrence of thermal runaway.

[0015] However, during the use of batteries, thermal runaway may occur or even spread due to various factors. At the same time, a large amount of gas will be generated when thermal runaway occurs. The threshold for triggering thermal runaway or spreading varies according to different battery operating conditions. At present, thermal runaway experiments are generally carried out through a single operating condition triggering method. After the test, the gas is collected using a gas collection bag, and finally the component analysis is performed using GC-MC.

[0016] However, this method cannot truly restore the actual complex working conditions, resulting in inaccurate test results for thermal runaway.

[0017] In order to solve the above technical problems, the present disclosure proposes a thermal runaway testing system.

[0018] Figure 1-Figure 3 is a schematic diagram of a thermal runaway test system according to an exemplary embodiment. Figure 1-Figure 3 As shown, the thermal runaway test system includes: Battery cell-module thermal runaway diffusion test sealing tank 1, sample table 2, gas collection device 3 and thermal runaway device.

[0019] The thermal runaway device includes the following sub-devices: an environmental heating device 41 , a humidity control device 42 , a puncture device 43 , an external heating device 44 , a charge and discharge device 45 , a short circuit device 46 and a gas control device 47 .

[0020] Among them, Figure 3 As shown, the sample table 2 is located inside the battery cell-module thermal runaway diffusion test sealed tank 1, and the sample table 2 is used to place the battery to be tested.

[0021] For example, two sample tables 2 can also be set, one of which is used to place batteries to be tested during the needle penetration test, hereinafter referred to as battery one to be tested, and the other sample table is used to place batteries to be tested during other tests, hereinafter referred to as battery two to be tested.

[0022] The environmental heating device 41 , the humidity control device 42 , the acupuncture device 43 and the gas control device 47 are all connected to the battery cell-module thermal runaway diffusion test sealing tank 1 .

[0023] The external heating device 44, the charging and discharging device 45 and the short-circuiting device 46 are all connected to the battery to be tested.

[0024] Continuing with the above example, when there are two sample stages 2, the external heating device 44, the charging and discharging device 45 and the short-circuit device 46 are all connected to the second battery to be tested.

[0025] An exhaust hole is provided on the tank wall of the battery cell-module thermal runaway diffusion test sealed tank 1, the exhaust switch is located in the exhaust hole, and the gas collection device 3 is connected to the inside of the battery cell-module thermal runaway diffusion test sealed tank 1 through the exhaust switch.

[0026] For example, the exhaust switch may be a solenoid valve.

[0027] In one embodiment, the environmental heating device 41, the humidity control device 42, the acupuncture device 43, the external heating device 44, the charging and discharging device 45, the short-circuit device 46 and the exhaust switch respectively have control chips, and the working status of each device and the exhaust switch can be controlled by the control chip.

[0028] Alternatively, the environmental heating device 41, the humidity control device 42, the acupuncture device 43, the external heating device 44, the charging and discharging device 45, the short-circuit device 46 and the exhaust switch respectively have communication modules, through which remote control can be received to remotely control the working status of these devices.

[0029] In another embodiment, the thermal runaway test system in the present disclosure includes a controller, which is respectively connected to the environmental heating device 41, the humidity control device 42, the acupuncture device 43, the external heating device 44, the charging and discharging device 45, the short-circuit device 46, the gas control device 47 and the exhaust switch, and the operating status of each device and the exhaust switch is controlled by the controller.

[0030] The gas collecting device 3 can collect the gas generated by the battery to be tested placed in the battery cell-module thermal runaway diffusion test sealed can 1 when the battery is in thermal runaway.

[0031] When it is necessary to collect gas, the exhaust switch can be controlled to open and the gas can be collected in the gas collecting device 3. After the gas collection is completed, the exhaust switch can be controlled to close.

[0032] Among them, the causes of thermal runaway may include: internal short circuit, overcharging and over-discharging, high temperature environment, etc.

[0033] The reasons for internal short circuits may be: there may be defects in the battery manufacturing process, such as impurities mixed into the electrode material, diaphragm defects, etc. These problems may cause the positive and negative electrodes inside the battery to directly contact, forming a short circuit. During the use of the battery, the internal structure of the battery may be damaged due to external impact, extrusion, etc., causing a short circuit. During long-term use, the expansion and contraction of the electrode material may cause the diaphragm to rupture, thereby causing an internal short circuit.

[0034] The reasons for thermal runaway caused by overcharging and overdischarging can be: when overcharging, the lithium ions inside the battery will be excessively embedded in the negative electrode material, causing the negative electrode structure to be damaged and generating a lot of heat. At the same time, overcharging may also cause the electrolyte to decompose, generating gas and heat. Overdischarging will cause the current collectors such as copper foil inside the battery to dissolve, causing internal short circuits, and then triggering thermal runaway.

[0035] The reasons for thermal runaway in high temperature environment can be: in high temperature environment, the chemical reaction speed inside the battery is accelerated, and the heat dissipation difficulty increases. If the battery is in a high temperature environment for a long time, it is easy to cause thermal runaway. External fire sources or high-temperature objects close to the battery may also cause the battery temperature to rise sharply, causing thermal runaway.

[0036] The present disclosure can simulate thermal runaway under various working conditions, specifically: In one embodiment, the environmental heating device 41 heats the inside of the battery cell-module thermal runaway diffusion test sealed can 1 by heating to control the ambient temperature inside the battery cell-module thermal runaway diffusion test sealed can 1 to achieve a temperature change condition simulating a real battery usage scenario, for example: the temperature change range can be 25-60°C.

[0037] The power and quantity of the environmental heating device 41 can be determined based on factors such as the size, material, thermal insulation performance and required temperature range of the battery cell-module thermal runaway diffusion test sealed can 1 to ensure that it can provide sufficient heat to make the temperature inside the battery cell-module thermal runaway diffusion test sealed can 1 reach a preset temperature value.

[0038] Specifically, the environmental heating device 41 includes: a resistance wire arranged on the inner wall of the battery cell-module thermal runaway diffusion test sealing tank 1; and a controller connected to the resistance wire.

[0039] The controller can control the resistance wire to heat according to the set ambient temperature, so that the temperature in the battery cell-module thermal runaway diffusion test sealed can 1 reaches the set ambient temperature.

[0040] In one embodiment, a temperature sensor can also be set in the battery cell-module thermal runaway diffusion test sealed tank 1. The temperature sensor is connected to the controller. The real-time temperature in the battery cell-module thermal runaway diffusion test sealed tank 1 is collected through the temperature sensor. When the real-time temperature reaches the ambient temperature, the resistance wire is controlled to stop heating.

[0041] In another embodiment, a temperature sensor may also be provided in the battery cell-module thermal runaway diffusion test sealing tank 1. In this case, the controller may receive the temperature signal from the temperature sensor, compare it with the set ambient temperature, and then output a control signal according to the deviation value to adjust the working state of the resistance wire.

[0042] For example, PID control can be used. Specifically, the PID controller outputs a control signal according to the linear combination of the three control actions of proportion (P), integration (I), and differentiation (D) according to the deviation between the set ambient temperature and the actual measured temperature value, and adjusts the heating wire. The proportional action can quickly respond to the deviation, the integral action can eliminate the steady-state error, and the differential action can predict the deviation change trend and make adjustments in advance to make the system more stable.

[0043] In one embodiment, the puncture device 43 can be used to perform a thermal runaway test on the battery to be tested by puncturing it. By controlling the displacement and speed of the puncture body, the battery to be tested can be subjected to puncture tests of different depths and puncture speeds to simulate the thermal runaway of the battery to be tested under the conditions of external puncture, for example, simulating the thermal runaway of the battery to be tested under the conditions of small bumps during use, or the puncture device can perform a puncture operation on the battery to be tested to cause the positive and negative electrodes inside the battery to directly contact and short-circuit, thereby causing the thermal runaway. At the same time, the puncture speed of the puncture device 43 can be in the range of 0.5-10 mm / s.

[0044] Specifically, the acupuncture device 43 includes: an acupuncture body and a needle body; A puncture hole is provided in the battery cell-module thermal runaway diffusion test sealed tank 1; the puncture body is connected to the needle body, and the needle body passes through the puncture hole and is located inside the battery cell-module thermal runaway diffusion test sealed tank 1.

[0045] When there is a controller, the controller is connected to the acupuncture body, and the controller can control the operation of the acupuncture body according to the set displacement and speed.

[0046] The acupuncture body can control the movement of the needle body by setting parameters, including the travel and speed of the needle body.

[0047] In one embodiment, the external heating device 44 is used to perform external heating on the battery to be tested, so as to increase the temperature of the battery itself and simulate the internal heat diffusion of the battery to be tested, so as to trigger thermal runaway.

[0048] Specifically, the external heating device 44 includes: a heating plate and a heating power supply; A heating hole is provided in the sealed tank 1 for the thermal runaway diffusion test of the battery cell-module; The heating plate is connected to a heating power source, passes through a heating hole and is located inside the cell-module thermal runaway diffusion test sealed tank 1 and is located on the surface of the battery to be tested; The controller is connected to the heating power supply, and the controller can control the heating plate to work according to the set temperature.

[0049] The heating plate is heated by applying an external current to provide external heat to the battery, thereby triggering thermal runaway.

[0050] Triggering thermal runaway by heating the battery to be tested is a common triggering method. The battery to be tested is heated by a heating plate or other device to increase the temperature of the battery to be tested, simulating the situation where the battery is locally overheated in a high temperature environment or due to an internal fault, thereby triggering thermal runaway. This method is easy to control the heating speed and temperature, and can better simulate the thermal runaway scenarios that may occur in actual applications.

[0051] In one embodiment, the charge-discharge device 45 can simulate thermal runaway caused by overcharging or overdischarging.

[0052] Among them, overcharge trigger refers to overcharging the battery, causing the lithium ions inside the battery to be excessively embedded in the negative electrode material, resulting in the destruction of the negative electrode structure, generating a large amount of heat, and then causing thermal runaway. This method mainly simulates the overcharge of the battery during the charging process due to charging system failure or human error.

[0053] Specifically, the charge-discharge device 45 includes: a charge-discharge line and a charge-discharge device body; A charging and discharging hole is provided in the sealed tank 1 for the thermal runaway diffusion test of the battery cell-module; One end of the charge and discharge line is connected to the main body of the charge and discharge device; The other end of the charge and discharge wire passes through the charge and discharge hole and is connected to the battery to be tested; The controller is connected to the main body of the charging and discharging device, and the controller can control the main body of the charging and discharging device to perform the charging and discharging process according to the set charging and discharging requirements.

[0054] The charging and discharging device body simulates the charging and discharging, overcharging and over-discharging of the battery inside the sealed can 1 of the battery cell-module thermal runaway diffusion test.

[0055] In one embodiment, the short-circuit device 46 can simulate thermal runaway of the battery to be tested due to a short circuit.

[0056] Specifically, the short-circuit device 46 includes: an adjustable resistor, a short-circuit line and a short-circuit device body; A short-circuit hole is opened in the cell-module thermal runaway diffusion test sealing tank 1; one end of the adjustable resistor is connected to the short-circuit device body, the other end of the adjustable resistor is connected to one end of the short-circuit line, and the other end of the short-circuit line passes through the short-circuit hole and is connected to the battery to be tested; a controller is connected to the short-circuit device body, and the controller controls the short-circuit device body to adjust the adjustable resistance according to the set short-circuit requirements, so as to simulate the external short-circuit state of currents of different sizes.

[0057] For example, the positive and negative electrodes of the battery to be tested can be connected to the input port of the short-circuit device body, one end of the adjustable resistor can be connected to a control end of the short-circuit device body, and the other end can be connected to a digital output pin or PWM output pin of the controller. In actual applications, a relay can also be selected, one end of its normally closed contact can be connected to the positive electrode of the battery, and the other end can be connected to the negative electrode of the battery through a short-circuit line, and the control end of the relay can be connected to another digital output pin of the controller.

[0058] Write a controller program. When it is necessary to simulate a momentary short circuit, the controller sends a high-level signal to the pin connected to the relay control end, causing the relay to immediately energize. The short-circuit line directly short-circuits the positive and negative poles of the battery, simulating a momentary short circuit of the battery.

[0059] The corresponding relationship between the duty cycle of the digital signal or PWM number output by the controller and the resistance value of the adjustable resistor can also be determined according to the characteristics of the adjustable resistor and the degree of short circuit to be simulated. By writing a program, the controller can output signals with different duty cycles to the pins connected to the adjustable resistor to accurately adjust the resistance value of the adjustable resistor. The smaller the resistance value, the higher the degree of short circuit, the greater the current in the circuit, and the lower the voltage across the battery, thereby simulating the state of the battery when it is short-circuited to different degrees.

[0060] A timer can also be set in the controller program to determine the period of intermittent short circuits and the duration of each short circuit. At the set time interval, the controller sends high and low level signals to the relay control pin to make the relay periodically close and open. When the relay is closed, the short circuit short-circuits the battery; when the relay is disconnected, the circuit is open, thereby simulating the intermittent short circuit state of the battery.

[0061] In one embodiment, the humidity control device 42 controls the ambient humidity in the battery cell-module thermal runaway diffusion test sealed can 1 by humidification to control the ambient humidity in the battery cell-module thermal runaway diffusion test sealed can 1 to achieve a humidification condition simulating a real battery usage scenario, for example: the humidity variation range can be 25-75RH%.

[0062] Specifically, the humidity control device 42 includes: a humidity control device body and a humidity control tube; A humidity hole is opened in the battery cell-module thermal runaway diffusion test sealed tank 1; one end of the humidity control tube is connected to the humidity control device body, and the other end of the humidity control tube passes through the humidity hole and is located inside the battery cell-module thermal runaway diffusion test sealed tank 1; the controller is connected to the humidity control device body, and the controller controls the operation of the humidity control device body according to the set humidity requirements.

[0063] In the present disclosure, a humidity sensor can be installed at a suitable position inside the battery cell-module thermal runaway diffusion test sealed tank 1, and the signal output end of the humidity sensor is connected to the signal input end of the controller, and the control signal output end of the controller is connected to the control interface of the humidity control device body. The humidity control tube is connected between the humidity control device body and the tank body to form a humidity control channel.

[0064] The humidity sensor monitors the humidity in the tank in real time and transmits the humidity signal to the controller. The controller has a preset target humidity value, and it will compare the actual humidity value transmitted by the sensor with the target humidity value. If the actual humidity is higher than the target humidity, the controller sends a signal to the humidity control device body to start the dehumidification function. The humidity control device body extracts the air in the tank through the humidity control tube, and then returns it to the tank after dehumidification treatment to reduce the humidity in the tank. Conversely, if the actual humidity is lower than the target humidity, the controller controls the humidity control device body to release water vapor or moisture into the tank through the humidity control tube to increase the humidity in the tank. The humidity sensor continuously monitors the changes in humidity in the tank and feeds back the new humidity data to the controller. The controller continuously adjusts the working state of the humidity control device body based on the feedback information to keep the humidity in the tank near the target value.

[0065] In one embodiment, the gas control device 47 adjusts the gas in the battery cell-module thermal runaway diffusion test sealing tank 1 by vacuuming or filling with inert gas to meet diversified environmental requirements.

[0066] Specifically, the gas control device 47 includes: a gas control device body and a gas control tube; a gas control hole is opened in the battery cell-module thermal runaway diffusion test sealed tank 1; one end of the gas control tube is connected to the gas control device body, and the other end of the gas control tube passes through the gas control hole and is located inside the battery cell-module thermal runaway diffusion test sealed tank 1; the controller is connected to the humidity control device body and the gas control device body, and is used to control the battery cell-module thermal runaway diffusion test sealed tank 1 to release corresponding gas according to the set gas requirements.

[0067] In one embodiment, in order to ensure the airtightness of the battery cell-module thermal runaway diffusion test sealed can 1, the environmental heating device 41, the humidity control device 42, the acupuncture device 43, the external heating device 44, the charging and discharging device 45, the short-circuit device 46, and the gas control device 47 are respectively sealed and matched with the battery cell-module thermal runaway diffusion test sealed can 1.

[0068] Specifically, sealing structures are arranged between the needle body and the hole wall of the puncture hole, between the heating plate and the hole wall of the heating hole, between the charging and discharging wires and the hole wall of the charging and discharging holes, between the short circuit wires and the hole wall of the short circuit hole, between the humidity control tube and the hole wall of the humidity hole, between the gas regulating tube and the hole wall of the gas regulating hole, and between the exhaust switch and the hole wall of the exhaust hole.

[0069] For example, the sealing structure may be a sealed bearing, a sealant, a sealing ring, etc., which is not limited in the present disclosure.

[0070] In one embodiment, an external electrode column can also be set on the battery cell-module thermal runaway diffusion test sealed tank 1; one end of the external electrode column is connected to the battery to be tested; the other end of the external electrode column is respectively connected to the external heating device 44, the charging and discharging device 45 and the short-circuit device 46.

[0071] The external heating device 44, the charging and discharging device 45 and the short-circuiting device 46 need to be directly connected to the battery to be tested. By setting an external electrode column outside the battery cell-module thermal runaway diffusion test sealed tank 1, the external heating device 44, the charging and discharging device 45 and the short-circuiting device 46 can be directly connected to the electrode column set outside the battery cell-module thermal runaway diffusion test sealed tank 1 without the need to lead wires to the inside of the battery cell-module thermal runaway diffusion test sealed tank 1. Since the number of leads is reduced, the safety during detection is increased.

[0072] In the present disclosure, there are multiple thermal runaway devices 4, with multiple triggering modes such as acupuncture, external heating, overcharge / overdischarge, external short circuit, etc., and with high temperature, high humidity and other environmental requirements, so that there can be multiple ways to realize thermal runaway triggering, and multiple scenarios can restore the thermal runaway-propagation threshold scenario under real working conditions. Through the coupling interaction between the various sub-devices in different thermal runaway devices 4, complex and changeable battery usage scenarios can be met, and the actual working conditions can be better simulated, so that the test results of thermal runaway are more accurate and closer to the real working conditions, and the test results are more accurate.

[0073] Figure 4 is a flow chart of a thermal runaway test method according to an exemplary embodiment. Figure 4 As shown, the method is applied to a thermal runaway test system as in any of the above embodiments, and the method includes the following steps S101-S102: In step S101, a test instruction is received, and the test instruction includes: setting parameters corresponding to the target thermal runaway device to be used, the thermal runaway device includes: an environmental heating device, a humidity control device, a needle device, an external heating device, a charging and discharging device, a short-circuit device, a gas control device and an exhaust switch, and the target thermal runaway device is at least one of the thermal runaway devices.

[0074] After it is detected that the placement of the battery to be tested is completed, a test instruction is received, and the test instruction may be manually input by a user or may be preset in the controller in advance.

[0075] In step S102, the test instruction is executed.

[0076] In the present disclosure, the coupling interaction between different components can be used to meet the complex and changeable battery usage scenarios and study the threshold of thermal runaway-diffusion of batteries and modules under actual working conditions.

[0077] The trigger and test environment in the present disclosure may be combined in a single or multiple ways, including but not limited to the following types: 1: A single external heating device triggers thermal runaway of batteries and modules and spreads.

[0078] When performing this type of simulation, the test instructions include the heating temperature of the external heating device.

[0079] 2: Use an external heating device and a charging and discharging device to simulate the heating + overcharging / over-discharging method to trigger the thermal runaway of batteries and modules - the spread, and study the spread and thermal runaway of a battery caused by overcharging, over-discharging, etc. to surrounding batteries.

[0080] When performing this type of simulation, the test instructions include the heating temperature of the external heating device and the charge and discharge time of the charge and discharge device.

[0081] 3: Use environmental heating devices, humidity control devices and external heating devices to simulate environmental heating, humidification + external heating to trigger thermal runaway of monomers and modules, and study the thermal runaway-propagation threshold under high temperature and high humidity conditions.

[0082] When this type of simulation is performed, the test instructions include: the heating temperature of the environmental heating device, the target humidity of the humidity control device, and the heating temperature of the external heating device.

[0083] 4: Use a puncture device, an external heating device, and a charge-discharge device to simulate overcharge / over-discharge and puncture the battery before heating to study the thermal runaway threshold of the damaged battery under overcharge / over-discharge / heating conditions.

[0084] When executing this type of simulation, the test instructions include the speed and step size of the acupuncture device, the heating temperature of the external heating device, and the charge and discharge time of the charge and discharge device.

[0085] In the present disclosure, each thermal runaway device can be operated not only automatically but also manually. In the present disclosure, thermal runaway of batteries and modules can be realistically simulated through different triggering methods and usage environments.

[0086] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 5As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data required for the test. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a thermal runaway test method is implemented.

[0087] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0088] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0089] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0090] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0091] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0092] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0093] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0094] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A thermal runaway test system, characterized in that: The thermal runaway test system comprises: Battery cell-module thermal runaway diffusion test sealed tank, sample table, gas collection device and thermal runaway device; The thermal runaway device includes the following devices: an environmental heating device, a humidity control device, a needle puncture device, an external heating device, a charging and discharging device, a short circuit device and a gas control device; Wherein, the sample stage is located inside the battery cell-module thermal runaway diffusion test sealed tank, and the sample stage is used to place the battery to be tested; The environmental heating device, the humidity control device, the acupuncture device and the gas control device are all connected to the battery cell-module thermal runaway diffusion test sealing tank; The external heating device, the charging and discharging device and the short-circuiting device are all connected to the battery to be tested; An exhaust hole is provided on the tank wall of the battery cell-module thermal runaway diffusion test sealed tank, an exhaust switch is located in the exhaust hole, and the gas collection device is connected to the interior of the battery cell-module thermal runaway diffusion test sealed tank through the exhaust switch.

2. The thermal runaway test system according to claim 1, characterized in that: The thermal runaway test system further includes: a controller; The controller is respectively connected to the environmental heating device, the humidity control device, the acupuncture device, the external heating device, the charging and discharging device, the short-circuit device, the gas control device and the exhaust switch.

3. The thermal runaway test system according to claim 2, characterized in that: The environmental heating device comprises: a resistance wire arranged on the inner wall of the battery cell-module thermal runaway diffusion test sealing tank; The controller is connected to the resistance wire.

4. The thermal runaway test system according to claim 2, characterized in that: The acupuncture device comprises: an acupuncture body and a needle body; A puncture hole is provided in the battery cell-module thermal runaway diffusion test sealing tank; The acupuncture body is connected to the needle body, and the needle body passes through the acupuncture hole and is located inside the battery cell-module thermal runaway diffusion test sealing tank; The controller is connected to the acupuncture body.

5. The thermal runaway test system according to claim 2, characterized in that: The external heating device comprises: a heating plate and a heating power supply; A heating hole is provided in the battery cell-module thermal runaway diffusion test sealing tank; The heating plate is connected to the heating power source, and the heating plate passes through the heating hole and is located inside the battery cell-module thermal runaway diffusion test sealing tank, and is located on the surface of the battery to be tested; The controller is connected to the heating power source.

6. The thermal runaway test system according to claim 2, characterized in that: The charging and discharging device comprises: a charging and discharging wire and a charging and discharging device body; A charging and discharging hole is provided in the battery cell-module thermal runaway diffusion test sealing tank; One end of the charging and discharging wire is connected to the charging and discharging device body; The other end of the charge and discharge line passes through the charge and discharge hole and is connected to the battery to be tested; The controller is connected to the charging and discharging device body.

7. The thermal runaway test system according to claim 2, characterized in that: The short-circuit device comprises: an adjustable resistor, a short-circuit line and a short-circuit device body; A short-circuit hole is provided in the battery cell-module thermal runaway diffusion test sealing tank; One end of the adjustable resistor is connected to the short-circuit device body, the other end of the adjustable resistor is connected to one end of the short-circuit line, and the other end of the short-circuit line passes through the short-circuit hole and is connected to the battery to be detected; The controller is connected to the short-circuit device body.

8. The thermal runaway test system according to claim 2, characterized in that: The humidity control device comprises: a humidity control device body and a humidity control tube; A humidity hole is provided in the battery cell-module thermal runaway diffusion test sealing tank; One end of the humidity control tube is connected to the main body of the humidity control device, and the other end of the humidity control tube passes through the humidity hole and is located inside the battery cell-module thermal runaway diffusion test sealed tank; The gas control device comprises: a gas control device body and a gas control pipe; A gas regulating hole is provided in the battery cell-module thermal runaway diffusion test sealing tank; One end of the gas regulating tube is connected to the main body of the gas regulating device, and the other end of the gas regulating tube passes through the gas regulating hole and is located inside the battery cell-module thermal runaway diffusion test sealing tank; The controller is connected to the humidity control device body and the gas control device body.

9. The thermal runaway test system according to claim 2, characterized in that: The environmental heating device, the humidity control device, the acupuncture device, the external heating device, the charging and discharging device, the short-circuit device, and the gas control device are respectively sealed and matched with the battery cell-module thermal runaway diffusion test sealing can.

10. The thermal runaway test system according to claim 2, characterized in that: An external electrode column is arranged on the battery cell-module thermal runaway diffusion test sealed tank; One end of the external electrode column is connected to the battery to be tested; The other end of the external electrode column is connected to the external heating device, the charging and discharging device and the short-circuiting device respectively.

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