Battery exhaust safety test method and device

Abstract

The invention discloses a battery exhaust safety test method and device, and relates to the technical field of battery test.The method comprises the steps that a battery to be tested is placed in a battery pack box body to be tested, and the battery pack box body is used for containing the battery to be tested and simulating a battery thermal runaway environment; guiding the to-be-tested battery to generate thermal runaway in a heating or puncturing manner; shooting and measuring the length of pressure relief eruption gas of the explosion-proof valve in the battery pack box body by using a high-speed camera; calculating the gas quantity in the battery pack box body based on the gas length measured by shooting; and quantitatively describing the thermal runaway degree of the battery in the battery pack box body based on the gas quantity.

Description

Technical Field

[0001] The present application relates to the field of battery testing technology, and in particular to a battery exhaust safety testing method and device. Background Art

[0002] With the rapid development of the new energy vehicle industry, battery safety performance has become one of the key factors restricting its further popularization. Battery thermal runaway is a major problem in the field of battery safety. Once it occurs, it will not only pose a huge threat to vehicles and passengers, but may also cause serious consequences such as fire and explosion. Therefore, the research and prevention of battery thermal runaway has become a top priority in the new energy vehicle industry.

[0003] At present, the research and testing methods for battery thermal runaway mainly rely on real battery packs for testing. Although this method can intuitively reflect the performance of the battery under thermal runaway conditions, it has many shortcomings. First, the cost of real battery packs is high, and there are major safety hazards during the test. Second, the test conditions of real battery packs are difficult to control accurately, and the repeatability and accuracy of the test results need to be improved. Summary of the invention

[0004] The purpose of this application is to provide a battery exhaust safety testing method and device.

[0005] To achieve the above objectives, this application provides the following solutions: In a first aspect, the present application provides a battery exhaust safety test method, comprising: Placing the battery to be tested in a battery pack box for testing, wherein the battery pack box is used to accommodate the battery to be tested and simulate a battery thermal runaway environment; Inducing thermal runaway of the battery to be tested by heating or puncturing; Using a high-speed camera to photograph and measure the length of the gas ejected by the explosion-proof valve in the battery pack box during pressure relief; Calculating the amount of gas in the battery pack box based on the gas length measured by the shooting; A quantitative description of the degree of thermal runaway of the battery inside the battery pack case is performed based on the amount of gas.

[0006] Optionally, the step of causing the battery to undergo thermal runaway by heating or puncturing includes: Heating the battery to be tested by a heating device to simulate an increase in battery temperature; Puncturing the battery to be tested by a puncture device to simulate an internal short circuit of the battery; Monitor the temperature and pressure changes of the battery to be tested.

[0007] Optionally, the step of photographing and measuring the length of the gas ejected by the pressure relief gas release of the explosion-proof valve in the battery pack box by using a high-speed camera includes: When the explosion-proof valve releases pressure, the high-speed camera is used to photograph the length of the pressure-released gas ejection; The length data of the pressure relief gas ejection is recorded.

[0008] Optionally, the step of calculating the amount of gas in the battery pack case based on the gas length measured by shooting includes: Calculating the volume of gas in the battery pack box according to the length of the pressure-released gas ejection; Calculating a change in gas pressure within the battery pack case based on the gas volume; The amount of gas in the battery pack case is calculated based on the change in gas pressure.

[0009] Optionally, the step of quantitatively describing the degree of thermal runaway of the battery inside the battery pack case based on the amount of gas includes: Determining a pressure variation range within the battery pack box according to the gas volume; Based on the pressure variation range, evaluating the severity of the thermal runaway of the battery; A quantitative report of the extent of thermal runaway of the battery is generated.

[0010] Optionally, the battery pack case is equipped with a high temperature resistant PC board; a safety pressure relief window is provided on the battery pack case when the pressure relief valve fails; a fixing device is provided at the bottom of the battery pack case; a universal flange is provided on the battery pack case; a 2mm round hole is opened on the side of the battery pack case to reserve a hole for the temperature sensing line; and a threaded port for a pressure sensor is installed on the side of the battery pack case.

[0011] Optionally, a high temperature resistant PC board is installed at the observation window of the battery pack case.

[0012] In a second aspect, the present application provides a battery exhaust safety test device, comprising: A test module, used to place a battery to be tested in a battery pack box for testing, wherein the battery pack box is used to accommodate the battery to be tested and simulate a battery thermal runaway environment; Inducing thermal runaway of the battery to be tested by heating or puncturing; An acquisition module, used to use a high-speed camera to photograph and measure the length of the gas ejected by the explosion-proof valve in the battery pack box during pressure relief; A processing module, used for calculating the amount of gas in the battery pack box based on the gas length measured by shooting; A quantitative description of the degree of thermal runaway of the battery inside the battery pack case is performed based on the amount of gas.

[0013] Optionally, the test module is further used to: Heating the battery to be tested by a heating device to simulate an increase in battery temperature; Puncturing the battery to be tested by a puncture device to simulate an internal short circuit of the battery; Monitor the temperature and pressure changes of the battery to be tested.

[0014] Optionally, the acquisition module is further used to: When the explosion-proof valve releases pressure, the high-speed camera is used to photograph the length of the pressure-released gas ejection; The length data of the pressure relief gas ejection is recorded.

[0015] Optionally, the processing module is further used to: Calculating the volume of gas in the battery pack box according to the length of the pressure-released gas ejection; Calculating a change in gas pressure within the battery pack case based on the gas volume; The amount of gas in the battery pack case is calculated based on the change in gas pressure.

[0016] Optionally, the processing module is further used to: Determining a pressure variation range within the battery pack box according to the gas volume; Based on the pressure variation range, evaluating the severity of the thermal runaway of the battery; A quantitative report of the extent of thermal runaway of the battery is generated.

[0017] Optionally, the battery pack case is equipped with a high temperature resistant PC board; a safety pressure relief window is provided on the battery pack case when the pressure relief valve fails; a fixing device is provided at the bottom of the battery pack case; a universal flange is provided on the battery pack case; a 2mm round hole is opened on the side of the battery pack case to reserve a hole for the temperature sensing line; and a threaded port for a pressure sensor is installed on the side of the battery pack case.

[0018] Optionally, a high temperature resistant PC board is installed at the observation window of the battery pack case.

[0019] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any one of the above-described battery exhaust safety testing methods.

[0020] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the above-described battery exhaust safety testing methods.

[0021] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any one of the above-mentioned battery exhaust safety testing methods.

[0022] According to the specific embodiments provided in this application, this application discloses the following technical effects: The present application provides a battery exhaust safety test method and device. By constructing a specially designed battery pack box, it is possible to accurately simulate the environment in which the battery experiences thermal runaway during actual use, thereby ensuring the accuracy and reliability of the test results. In addition, by heating or puncturing, the battery to be tested can be safely and controllably guided to undergo thermal runaway within the box, thereby reducing the test cost. A high-speed camera is also used to perform non-contact photography and measurement of the length of the gas ejected by the explosion-proof valve during pressure relief, thereby avoiding the errors and safety hazards that may be caused by traditional measurement methods and improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A schematic diagram of a flow chart of a battery exhaust safety test method provided in one embodiment of the present application; Figure 2 A schematic diagram of a battery box provided in one embodiment of the present application; Figure 3 A schematic diagram of functional modules of a battery exhaust safety test device provided in one embodiment of the present application; Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figure 1As shown, some embodiments of the present application provide a battery exhaust safety test method, which includes the following steps 101 to 105. Among them: Step 101: Place the battery to be tested in a battery pack box for testing, wherein the battery pack box is used to accommodate the battery to be tested and simulate a battery thermal runaway environment.

[0027] In the embodiment of the present application, the battery to be tested refers to the battery that needs to undergo a battery exhaust safety test, i.e., the target object of this test. The battery pack box is a specially designed test device for accommodating the battery to be tested and simulating the thermal runaway environment that may occur in the actual use of the battery.

[0028] The system will carefully place the battery to be tested into the battery pack box. The battery pack box is designed to meet the size requirements of most battery cells on the market to ensure the breadth and applicability of the test. At the same time, the structure and materials inside the box are carefully selected to simulate the thermal runaway environment of the battery in actual use, including a high-temperature resistant PC board for observing the test process; a pressure sensor threaded port for real-time monitoring of the internal pressure of the box, etc. In this way, the battery to be tested is placed in a test device that highly simulates the real environment, ready for the next test.

[0029] For example, the battery pack case can be Figure 2 described.

[0030] Step 102: Induce thermal runaway of the battery to be tested by heating or puncturing.

[0031] In the embodiment of the present application, heating is to increase the temperature of the battery under test through an external heat source to simulate thermal runaway caused by overheating of the battery in actual use. Puncture is to pierce the outer shell of the battery under test with a sharp object to simulate internal short circuit and thermal runaway caused by external force damage to the battery in actual use.

[0032] The system will use heating or puncture methods to induce thermal runaway in the battery under test. The heating method can be applied to the battery through an external heat source such as a heating wire or a heating plate, causing its internal temperature to rise sharply, thereby causing thermal runaway. The puncture method is to pierce the outer shell of the battery through sharp objects such as needles and steel needles, destroying its internal structure, causing internal short circuits and thermal runaway. Both methods can effectively simulate the thermal runaway conditions that may occur in the actual use of the battery, and provide the necessary conditions for the subsequent testing of the pressure relief performance of the explosion-proof valve.

[0033] Step 103: Use a high-speed camera to photograph and measure the length of the gas ejected by the explosion-proof valve in the battery pack body during pressure relief.

[0034] In the embodiment of the present application, a high-speed camera is a high-resolution, high-frame-rate camera device that can capture fast-moving objects or phenomena and record their dynamic processes. The length of the gas ejected by the explosion-proof valve during pressure relief refers to the length of the trajectory formed by the gas ejected when the explosion-proof valve opens to release the internal pressure during the battery thermal runaway process.

[0035] The system uses a high-speed camera to photograph and measure the length of the gas ejected from the explosion-proof valve in the battery pack case. When the battery under test experiences thermal runaway, the pressure and temperature inside the battery pack case will rise sharply. When reaching a certain level, the explosion-proof valve will open to release the internal pressure. At this time, the high-speed camera will capture the trajectory of the gas ejected at the moment the explosion-proof valve opens and record its length. This data is crucial for the subsequent calculation of the amount of gas in the battery pack case and the assessment of the degree of thermal runaway of the battery.

[0036] Step 104 : Calculate the amount of gas in the battery pack case based on the gas length measured by the photography.

[0037] In the embodiments of the present application, the gas length refers to the length of the trajectory of the gas emitted by the explosion-proof valve after decompression. The gas volume in the battery pack box refers to the total amount of gas generated in the battery pack box during the thermal runaway of the battery.

[0038] The system will calculate the amount of gas in the battery pack based on the measured gas length, combined with known algorithms and physical models. This calculation process needs to take into account factors such as the physical properties of the gas, the geometric dimensions of the box, and the dynamic characteristics of the erupting gas. Through this step, the system can accurately quantify the amount of gas generated by the battery during thermal runaway, providing data support for subsequent evaluation of the degree of thermal runaway of the battery.

[0039] Step 105: quantitatively describe the degree of thermal runaway of the battery inside the battery pack box based on the gas amount.

[0040] In the embodiment of the present application, the gas volume refers to the calculated gas volume in the battery pack box. The battery thermal runaway degree refers to the degree and severity of damage exhibited by the battery during the thermal runaway process.

[0041] Based on the calculated gas volume, the system will quantitatively describe the degree of thermal runaway of the battery inside the battery pack. This process requires comparing the calculated gas volume with a known threshold or standard to assess the severity of the battery thermal runaway. Through this step, the system can provide an objective and quantitative basis for the safety performance evaluation of the battery, which will help promote the healthy development of the new energy industry. At the same time, it also provides important reference information for the design and development of safer batteries and battery packs.

[0042] The embodiment of the present application can accurately simulate the environment when thermal runaway occurs in actual use of the battery by constructing a specially designed battery pack case, thereby ensuring the accuracy and reliability of the test results, and can safely and controllably guide the battery to be tested to undergo thermal runaway in the case by heating or puncturing, thereby reducing the test cost. A high-speed camera is also used to perform non-contact photography and measurement of the length of the gas ejected by the pressure relief valve, thereby avoiding the errors and safety hazards that may be caused by traditional measurement methods and improving the accuracy of the measurement.

[0043] Optionally, the step 102 includes: Step 1021 , heating the battery to be tested by a heating device to simulate a temperature increase of the battery.

[0044] In the embodiment of the present application, the heating device is a device that can generate heat, which is used to increase the temperature of the battery to be tested, simulating the temperature increase of the battery in actual use due to external heat sources or internal short circuits.

[0045] The system will heat the battery under test through a heating device. The heating device can be a heating wire, a heating plate, etc. They generate heat through the action of electric current and transfer the heat to the battery under test. As the temperature rises, the chemical reaction inside the battery will accelerate, which may cause thermal runaway of the battery. This process simulates the temperature rise of the battery in actual use due to external heat sources or internal problems, and provides the necessary conditions for the subsequent testing of the pressure relief performance of the explosion-proof valve.

[0046] Step 1022, puncture the battery to be tested by a puncture device to simulate an internal short circuit of the battery.

[0047] In the embodiment of the present application, the puncture device is a device with a sharp component, which is used to puncture the outer casing of the battery to be tested, simulating the internal short circuit situation of the battery that may be caused by external force damage in actual use.

[0048] The system will puncture the battery under test through a puncture device. The puncture device can be a sharp object such as a needle or a steel needle, which can pierce the outer shell of the battery, destroy the internal structure of the battery, and cause an internal short circuit in the battery. The short circuit will trigger a violent chemical reaction inside the battery, generating a large amount of heat and gas, further promoting the thermal runaway process of the battery. This process simulates the internal short circuit that may be caused by external force damage in actual use of the battery, which helps to evaluate the pressure relief performance of the explosion-proof valve under battery thermal runaway conditions.

[0049] Step 1023, monitoring the temperature and pressure changes of the battery to be tested.

[0050] In an embodiment of the present application, the system monitors the temperature and pressure changes of the battery to be tested in real time. Temperature and pressure sensors will be installed in appropriate locations on the battery pack body to capture changes inside the battery in real time. As the heating and puncture process proceeds, the temperature and pressure inside the battery will gradually increase. When a certain level is reached, the explosion-proof valve will open to release the internal pressure. By monitoring these changes, the system can evaluate the degree of thermal runaway of the battery and the pressure relief performance of the explosion-proof valve, providing data support for subsequent analysis and improvement. At the same time, these data can also be used to optimize the design and testing methods of the battery pack body, and improve the accuracy and reliability of the test.

[0051] Optionally, the step 103 includes: Step 1031, when the explosion-proof valve releases pressure, use the high-speed camera to shoot the length of the pressure-released gas.

[0052] In the embodiment of the present application, the explosion-proof valve is a safety device on the battery pack body. When the internal pressure of the battery exceeds the set value, the explosion-proof valve will open to release the pressure to prevent the battery from exploding. A high-speed camera is a high-resolution, high-frame-rate camera device that can quickly capture dynamically changing processes and is suitable for shooting fast-moving objects or phenomena. The length of the pressure-release gas refers to the length of the trajectory formed by the gas ejected when the explosion-proof valve is opened, and is an important indicator for evaluating the pressure relief performance of the explosion-proof valve.

[0053] When the internal pressure of the battery under test increases due to heating or puncture, and the explosion-proof valve opens to release pressure, the system will start the high-speed camera. The high-speed camera is aimed at the position of the explosion-proof valve to quickly capture the trajectory of the gas ejected at the moment the explosion-proof valve opens. Through the shooting of the high-speed camera, the system can clearly record the length of the gas ejected by the pressure release, providing accurate image data for subsequent data analysis and evaluation.

[0054] Step 1032, recording the length data of the pressure relief ejection gas.

[0055] In the embodiment of the present application, the length data refers to the trajectory length data of the pressure relief and erupting gas obtained by taking pictures with a high-speed camera, which is the basis for quantitatively evaluating the pressure relief performance of the explosion-proof valve.

[0056] The system will quantify and record the length of the decompression gas eruption captured by the high-speed camera. Through image processing technology, the system can accurately measure the trajectory length of the erupting gas and record this data. The recorded length data will be used for subsequent analysis and evaluation to help the system understand the pressure relief performance of the explosion-proof valve and the performance of the battery under thermal runaway conditions. This step is an important part of evaluating the safety performance of the battery and provides strong data support for the design and improvement of the battery.

[0057] Optionally, the step 104 includes: Step 1041, calculating the gas volume in the battery pack box according to the length of the pressure-release gas spray.

[0058] In the embodiment of the present application, the length of the decompression gas refers to the length of the trajectory formed by the gas ejected when the explosion-proof valve is opened, and this length can be obtained by photographing with a high-speed camera or other equipment. The gas volume refers to the total volume of the gas in the battery pack box, which is a physical quantity that describes the size of the space occupied by the gas.

[0059] The system will calculate the gas volume in the battery pack box according to the length of the depressurized gas ejection through a pre-set algorithm or model. This calculation process may involve relevant knowledge such as gas dynamics and fluid mechanics, as well as taking into account factors such as the geometric shape of the box and the gas ejection speed. Through this calculation, the system can obtain the volume data of the gas in the battery pack box, providing a basis for subsequent gas pressure changes and gas volume calculations.

[0060] Step 1042: Calculate the change in gas pressure within the battery pack case based on the gas volume.

[0061] In the embodiments of the present application, the gas pressure change refers to the change of the gas pressure in the battery pack box over time or under conditions, and is an important parameter for describing the change of the gas state.

[0062] The system will calculate the change in gas pressure inside the battery pack based on the calculated gas volume, combined with the gas state equation (such as the ideal gas state equation) and related thermodynamic knowledge. This calculation process needs to take into account factors such as the initial pressure and temperature of the gas and the volume change inside the box. Through this calculation, the system can obtain the change in gas pressure inside the battery pack, providing an important basis for evaluating the degree of thermal runaway of the battery and the pressure relief performance of the explosion-proof valve.

[0063] Step 1043, calculating the amount of gas in the battery pack box according to the change in gas pressure.

[0064] In the embodiment of the present application, the system will further calculate the amount of gas in the battery pack box based on the calculated gas pressure change, combined with parameters such as the compressibility of the gas, the volume of the box, and the initial state of the gas. This calculation process may involve complex thermodynamics and fluid mechanics calculations, but through this step, the system can obtain the total amount of gas in the battery pack box, providing comprehensive data support for evaluating the degree of thermal runaway of the battery, the pressure relief performance of the explosion-proof valve, and the safety performance of the battery pack. At the same time, this data can also be used to optimize the design and testing methods of the battery pack and improve the reliability and safety of the battery.

[0065] Optionally, the step 105 includes: Step 1051, determining the pressure variation range in the battery pack box according to the gas volume.

[0066] In the implementation of this application, the system will further analyze the pressure changes in the battery pack box based on the calculated gas volume, combined with the gas state equation and thermodynamic principles. The system will consider factors such as the compressibility of the gas, the volume change of the box, and the temperature change of the gas, and determine the pressure change range of the gas in the box through calculation or simulation. The results of this step will provide an important basis for the subsequent assessment of the severity of battery thermal runaway.

[0067] Step 1052: Evaluate the severity of the battery thermal runaway based on the pressure variation range.

[0068] In the embodiments of the present application, the severity of battery thermal runaway refers to the severity of changes in parameters such as internal temperature and pressure of the battery during thermal runaway, as well as the degree of damage that may be caused to the battery pack body and the surrounding environment.

[0069] The system will assess the severity of battery thermal runaway based on the determined pressure change range and combined with relevant knowledge and experience of battery thermal runaway. The system will consider factors such as the size, speed and duration of pressure changes, and evaluate the risks and impacts of battery thermal runaway through comparative analysis or model prediction. The results of this step will provide an important reference for formulating countermeasures and optimizing battery design.

[0070] Step 1053: Generate a quantitative report on the degree of thermal runaway of the battery.

[0071] In the embodiments of the present application, the quantitative report refers to a report that specifically and quantitatively describes and summarizes the degree of thermal runaway of the battery in the form of numbers, charts, etc.

[0072] Based on the analysis and evaluation results of the previous steps, the system will generate a quantitative report on the degree of battery thermal runaway. The report will include detailed data on battery thermal runaway, such as the pressure change range, temperature change, gas volume, etc., as well as the evaluation results of the severity of battery thermal runaway based on these data. This report will provide relevant personnel with comprehensive and accurate information to help them understand the situation of battery thermal runaway, develop effective countermeasures, and optimize battery design and testing methods.

[0073] Optionally, the battery pack case is equipped with a high temperature resistant PC board; a safety pressure relief window is provided on the battery pack case when the pressure relief valve fails; a fixing device is provided at the bottom of the battery pack case; a universal flange is provided on the battery pack case; a 2mm round hole is opened on the side of the battery pack case to reserve a hole for the temperature sensing line; and a threaded port for a pressure sensor is installed on the side of the battery pack case.

[0074] In the embodiment of the present application, the PC board is a polycarbonate board, and the high temperature resistant PC board is a plastic board with excellent heat resistance. High temperature resistant PC boards specifically refer to those PC boards that can withstand higher temperatures without significant deformation or damage. During the design of the battery pack case, the system will be equipped with a high temperature resistant PC board on the case. This type of sheet is typically used as a covering or protective material for the case because it can withstand the heat generated by the battery in thermal runaway or other high temperature conditions, protect the internal structure of the case from damage, and prevent heat from dissipating too quickly into the surrounding environment.

[0075] The pressure relief valve is a safety device used to release pressure when the pressure inside the battery pack is too high to prevent the box from exploding. The safety pressure relief window is an opening or weak area designed on the box. When the pressure relief valve fails, this window will serve as a backup pressure relief channel to prevent the box from rupturing due to excessive pressure. During the design process of the battery pack box, the system will set a safety pressure relief window on the box. This window is usually designed in a relatively safe position of the box. When the pressure relief valve fails for some reason, the pressure inside the box can be released through this window, thereby protecting the safety of the box and the surrounding environment.

[0076] A fixture is a device used to securely fix the battery pack case to a specific location or device. During the manufacturing or installation of the battery pack case, the system will set fixtures at the bottom of the case. These devices can be bolts, snaps or other forms of connectors that can securely fix the case to the vehicle, equipment or test platform to prevent the case from moving or falling off during transportation, use or testing.

[0077] A universal flange is a connection plate with a universal interface, which is usually used to connect different devices or pipelines to achieve the transmission and control of fluids or gases. During the design of the battery pack box, the system will set a universal flange on the box. This flange can be used as a connection interface between the box and other devices or systems to transmit coolant, gas or make other types of connections. By using a universal flange, the box can be easily connected and disconnected from other devices, improving the flexibility and maintainability of the system.

[0078] A temperature sensing line is a sensor line used to measure temperature, usually containing a thermistor or other type of temperature sensor. A reserved hole is a hole pre-opened on the case for installing or passing through specific components or lines. During the manufacturing process of the battery pack case, the system will open a 2mm round hole on the side of the case as a reserved hole for the temperature sensing line. This hole allows the temperature sensing line to pass through the case and connect to the temperature sensor inside the battery or case, thereby monitoring the temperature changes of the battery or case in real time. By reserving this hole, the temperature sensing line can be easily installed and replaced, improving the maintainability and reliability of the system.

[0079] A pressure sensor is a sensor used to measure pressure, which can convert pressure signals into electrical signals for transmission and processing. A threaded port is a connection port with threads, which is used to install or connect threaded components or pipes. During the manufacturing process of the battery pack case, the system will install a threaded port for the pressure sensor on the side of the case. This threaded port allows the pressure sensor to be securely mounted on the case through a threaded connection and connected to the pressure measurement point inside the case. By installing the threaded port of the pressure sensor, the pressure sensor can be easily installed and replaced, and the pressure changes inside the case can be monitored in real time, providing important guarantees for the safe operation of the system.

[0080] Optionally, a high temperature resistant PC board is installed at the observation window of the battery pack case.

[0081] In the embodiment of the present application, during the design and manufacturing process of the battery pack case, the system takes into account the special needs of the observation window, that is, it is necessary to be able to clearly observe the internal situation of the battery pack and to withstand the high temperature that may be generated by the battery during operation. Therefore, the system selects a high temperature resistant PC board as the material of the observation window. During the specific installation process, the system first cuts out a high temperature resistant PC board of appropriate size according to the design and size of the battery pack case. Then, use a special installation tool or method to firmly install the high temperature resistant PC board at the position of the observation window. During the installation process, the system will ensure the sealing of the high temperature resistant PC board and the battery pack case to prevent external moisture, dust and other impurities from entering the battery pack, while ensuring the clarity and transparency of the observation window. By installing the high temperature resistant PC board, the battery pack case not only realizes the observation function of the internal battery, but also ensures safety and reliability in a high temperature environment. This design makes the battery pack case more suitable for various complex and harsh working environments, and improves the overall performance and stability of the battery system.

[0082] Based on the same inventive concept, the embodiment of the present application also provides a battery exhaust safety test device for implementing the battery exhaust safety test method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery exhaust safety test device embodiments provided below can refer to the limitations of the battery exhaust safety test method above, and will not be repeated here.

[0083] In an exemplary embodiment, Figure 3 As shown, a battery exhaust safety test device 20 is provided, comprising: A test module 201 is used to place a battery to be tested in a battery pack box for testing, wherein the battery pack box is used to accommodate the battery to be tested and simulate a battery thermal runaway environment; Inducing thermal runaway of the battery to be tested by heating or puncturing; An acquisition module 202 is used to use a high-speed camera to photograph and measure the length of the gas ejected by the explosion-proof valve in the battery pack box; A processing module 203 is used to calculate the amount of gas in the battery pack box based on the gas length measured by shooting; A quantitative description of the degree of thermal runaway of the battery inside the battery pack case is performed based on the amount of gas.

[0084] Optionally, the testing module 201 is further used for: Heating the battery to be tested by a heating device to simulate an increase in battery temperature; Puncturing the battery to be tested by a puncture device to simulate an internal short circuit of the battery; Monitor the temperature and pressure changes of the battery to be tested.

[0085] Optionally, the acquisition module 202 is further used for: When the explosion-proof valve releases pressure, the high-speed camera is used to photograph the length of the pressure-released gas ejection; The length data of the pressure relief gas ejection is recorded.

[0086] Optionally, the processing module 203 is further configured to: Calculating the volume of gas in the battery pack box according to the length of the pressure-released gas ejection; Calculating a change in gas pressure within the battery pack case based on the gas volume; The amount of gas in the battery pack case is calculated based on the change in gas pressure.

[0087] Optionally, the processing module 203 is further configured to: Determining a pressure variation range within the battery pack box according to the gas volume; Based on the pressure variation range, evaluating the severity of the thermal runaway of the battery; A quantitative report of the extent of thermal runaway of the battery is generated.

[0088] Optionally, the battery pack case is equipped with a high temperature resistant PC board; a safety pressure relief window is provided on the battery pack case when the pressure relief valve fails; a fixing device is provided at the bottom of the battery pack case; a universal flange is provided on the battery pack case; a 2mm round hole is opened on the side of the battery pack case to reserve a hole for the temperature sensing line; and a threaded port for a pressure sensor is installed on the side of the battery pack case.

[0089] Optionally, a high temperature resistant PC board is installed at the observation window of the battery pack case.

[0090] The embodiment of the present application can accurately simulate the environment when thermal runaway occurs in actual use of the battery by constructing a specially designed battery pack case, thereby ensuring the accuracy and reliability of the test results, and can safely and controllably guide the battery to be tested to undergo thermal runaway in the case by heating or puncturing, thereby reducing the test cost. A high-speed camera is also used to perform non-contact photography and measurement of the length of the gas ejected by the pressure relief valve, thereby avoiding the errors and safety hazards that may be caused by traditional measurement methods and improving the accuracy of the measurement.

[0091] 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 4 As 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 battery exhaust safety test data. 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 battery exhaust safety test method is implemented.

[0092] Those skilled in the art will understand that Figure 4The 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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).

[0098] 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.

[0099] 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.

[0100] 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 battery exhaust safety test method, characterized in that: The battery exhaust safety test method comprises: Placing the battery to be tested in a battery pack box for testing, wherein the battery pack box is used to accommodate the battery to be tested and simulate a battery thermal runaway environment; Inducing thermal runaway of the battery to be tested by heating or puncturing; Using a high-speed camera to photograph and measure the length of the gas ejected by the explosion-proof valve in the battery pack box during pressure relief; Calculating the amount of gas in the battery pack box based on the gas length measured by the shooting; A quantitative description of the degree of thermal runaway of the battery inside the battery pack case is performed based on the amount of gas.

2. The battery exhaust safety testing method according to claim 1, characterized in that: The step of causing the battery to undergo thermal runaway by heating or puncturing comprises: Heating the battery to be tested by a heating device to simulate an increase in battery temperature; Puncturing the battery to be tested by a puncture device to simulate an internal short circuit of the battery; Monitor the temperature and pressure changes of the battery to be tested.

3. The battery exhaust safety testing method according to claim 1, characterized in that: The step of photographing and measuring the length of the gas emitted by the explosion-proof valve in the battery pack box by using a high-speed camera comprises: When the explosion-proof valve releases pressure, the high-speed camera is used to photograph the length of the pressure-released gas ejection; The length data of the pressure relief gas ejection is recorded.

4. The battery exhaust safety testing method according to claim 1, characterized in that: The step of calculating the amount of gas in the battery pack case based on the photographed and measured gas length includes: Calculating the volume of gas in the battery pack box according to the length of the pressure-released gas ejection; Calculating a change in gas pressure within the battery pack case based on the gas volume; The amount of gas in the battery pack case is calculated based on the change in gas pressure.

5. The battery exhaust safety testing method according to claim 1, characterized in that: The step of quantitatively describing the degree of thermal runaway of the battery inside the battery pack case based on the amount of gas includes: Determining a pressure variation range within the battery pack box according to the gas volume; Based on the pressure variation range, evaluating the severity of the thermal runaway of the battery; A quantitative report of the extent of thermal runaway of the battery is generated.

6. The battery exhaust safety testing method according to claim 1, characterized in that: The battery pack case is equipped with a high-temperature resistant PC board; a safety pressure relief window is provided on the battery pack case in case the pressure relief valve fails; a fixing device is provided at the bottom of the battery pack case; a universal flange is provided on the battery pack case; a 2mm round hole is provided on the side of the battery pack case to reserve a hole for the temperature sensing line; a threaded port for a pressure sensor is installed on the side of the battery pack case.

7. The battery exhaust safety testing method according to claim 6, characterized in that: A high temperature resistant PC board is installed at the observation window of the battery pack box.

8. A battery exhaust safety test device, characterized in that: The battery exhaust safety testing device comprises: A test module, used to place a battery to be tested in a battery pack box for testing, wherein the battery pack box is used to accommodate the battery to be tested and simulate a battery thermal runaway environment; Inducing thermal runaway of the battery to be tested by heating or puncturing; An acquisition module, used to use a high-speed camera to photograph and measure the length of the gas ejected by the explosion-proof valve in the battery pack box during pressure relief; A processing module, used for calculating the amount of gas in the battery pack box based on the gas length measured by shooting; A quantitative description of the degree of thermal runaway of the battery inside the battery pack case is performed based on the amount of gas.

9. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the battery exhaust safety test method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery exhaust safety test method described in any one of claims 1 to 7 are implemented.

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