Thermal runaway early warning method, device, equipment, storage medium and program product

Abstract

The application relates to a thermal runaway early warning method, device, equipment, storage medium and program product. The method comprises the following steps: obtaining a to-be-tested air pressure in a to-be-tested battery in an energy storage system, determining a to-be-tested air pressure vector according to the to-be-tested air pressure, determining the similarity between the to-be-tested air pressure vector and a standard air pressure vector under a standard test working condition, and then determining a thermal runaway early warning result of the to-be-tested battery according to the similarity and a preset threshold value, so that the thermal runaway early warning can be performed by studying the air pressure change characteristics in the battery, the accuracy of the thermal runaway early warning is improved, and the safety and reliability of the energy storage system are improved.

Description

Technical Field

[0001] This application relates to the field of safety early warning technology, and in particular to a thermal runaway early warning method, device, equipment, storage medium, and program product. Background Technology

[0002] With the transformation of the global energy structure and the demand for sustainable development, energy storage power stations, as key energy management facilities, are becoming increasingly important. Batteries, as widely used energy storage devices in energy storage power stations, present particularly prominent safety concerns. Batteries are typical complex nonlinear electrochemical systems, and their thermal runaway process involves the uncontrolled chemical reactions within the battery and the rapid release of energy. This process is usually accompanied by a sharp rise in battery temperature, which may further trigger fires or explosions, posing a serious threat to the safe operation of energy storage power stations. Therefore, early warning and handling of battery thermal runaway events are crucial.

[0003] Currently, thermal runaway prediction relies on external characteristic signals of the battery, such as voltage and temperature. However, this method of thermal runaway early warning based on external characteristic signals cannot accurately determine the true internal state of the battery, thus leading to low accuracy in thermal runaway early warning. Summary of the Invention

[0004] Therefore, it is necessary to provide a thermal runaway early warning method, device, equipment, storage medium, and program product that can improve the accuracy of thermal runaway early warning in response to the above-mentioned technical problems.

[0005] Firstly, this application provides a method for early warning of thermal runaway. The method includes:

[0006] Obtain the pressure of the battery under test in the energy storage system.

[0007] Determine the pressure vector to be measured based on the pressure to be measured.

[0008] Determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions;

[0009] Based on the similarity and the preset threshold, the thermal runaway early warning result of the battery under test is determined.

[0010] In one embodiment, determining the pressure vector based on the pressure to be measured includes:

[0011] The pressure vector to be measured is determined based on the pressure to be measured and the state of charge of the battery to be measured. In one embodiment, the preset threshold includes a preset similarity, and the determination of the thermal runaway early warning result of the battery to be measured based on the similarity and the preset threshold includes:

[0012] If the similarity is greater than the preset similarity, the thermal runaway warning result of the battery under test is determined to be an anomaly of the battery under test.

[0013] In one embodiment, the preset threshold further includes a preset similarity change rate. The determination of the thermal runaway warning result for the battery under test based on the similarity and the preset threshold includes:

[0014] If the similarity is greater than the preset similarity and the rate of change of the similarity is greater than the preset rate of change of the similarity, then the thermal runaway warning result is determined to be an anomaly of the battery under test.

[0015] The similarity change rate is determined by the quotient of the similarity change divided by the time change. The similarity change is equal to the difference between the current similarity and the previous similarity, and the time change is equal to the difference between the time point corresponding to the current similarity and the time point corresponding to the previous similarity.

[0016] In one embodiment, the method further includes:

[0017] If the thermal runaway warning result indicates an abnormality in the battery under test, a control command is generated.

[0018] The control command is sent to the control device of the energy storage system; the control command is used to instruct the control device to power down the energy storage system and to open the valve to vent the battery under test.

[0019] In one embodiment, determining the similarity between the pressure vector to be measured and the standard pressure vector includes:

[0020] Determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and use this cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

[0021] Secondly, this application also provides a thermal runaway early warning device. The device includes:

[0022] The acquisition module is used to acquire the pressure of the battery under test inside the energy storage system.

[0023] The first determining module is used to determine the pressure vector to be measured based on the pressure to be measured.

[0024] The second determining module is used to determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions;

[0025] The third determining module is used to determine the thermal runaway warning result of the battery under test based on the similarity and the preset threshold.

[0026] Thirdly, this application also provides a computer device, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of any of the above methods.

[0027] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above methods.

[0028] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the above methods.

[0029] The aforementioned thermal runaway early warning method, device, equipment, storage medium, and program products acquire the test pressure inside the battery under test in the energy storage system, determine the test pressure vector based on the test pressure, determine the similarity between the test pressure vector and the standard pressure vector under standard test conditions, and then determine the thermal runaway early warning result of the battery under test based on the similarity and a preset threshold. This enables thermal runaway early warning by studying the characteristics of internal pressure changes in the battery, improving the accuracy of thermal runaway early warning and enhancing the safety and reliability of the energy storage system. Attached Figure Description

[0030] Figure 1 This is an internal structural diagram of a computer device provided in an embodiment of this application;

[0031] Figure 2 This is a schematic flowchart of a thermal runaway early warning method provided in an embodiment of this application;

[0032] Figure 3 This is a flowchart illustrating a control command sending method provided in an embodiment of this application;

[0033] Figure 4 This is a flowchart illustrating a method for early warning and control of thermal runaway based on the internal gas pressure of a prismatic lithium battery, provided in an embodiment of this application.

[0034] Figure 5 This is a schematic diagram of a warning point for lateral heating provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of an overcharge warning point provided in an embodiment of this application;

[0036] Figure 7 This is a structural block diagram of a thermal runaway early warning device provided in an embodiment of this application. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0038] With the transformation of the global energy structure and the demand for sustainable development, energy storage power stations, as key energy management facilities, are becoming increasingly important. Batteries, as widely used energy storage devices in energy storage power stations, present particularly prominent safety concerns. Batteries are typical complex nonlinear electrochemical systems, and their thermal runaway process involves the uncontrolled chemical reactions within the battery and the rapid release of energy. This process is usually accompanied by a sharp rise in battery temperature, which may further trigger fires or explosions, posing a serious threat to the safe operation of energy storage power stations. Therefore, early warning and handling of battery thermal runaway events are crucial.

[0039] Currently, thermal runaway prediction relies on external characteristic signals of the battery, such as voltage and temperature. However, this method of thermal runaway early warning based on external characteristic signals cannot accurately determine the true internal state of the battery, thus leading to low accuracy in thermal runaway early warning.

[0040] The thermal runaway early warning method provided in this application embodiment can be applied to, for example... Figure 1 The application environment shown. Figure 1 This is an internal structure diagram of a computer device provided in an embodiment of this application. The computer device may be a server, and its internal structure diagram may be as follows: Figure 1 As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and databases. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a thermal runaway early warning method.

[0041] Those skilled in the art will understand that Figure 1 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0042] In one embodiment, such as Figure 2 As shown, Figure 2This is a flowchart illustrating a thermal runaway early warning method provided in an embodiment of this application. This method can be applied to... Figure 1 The method, using a computer device, includes the following steps:

[0043] S201, Obtain the pressure inside the battery under test in the energy storage system.

[0044] Optionally, the battery to be tested can be, for example, a lithium-ion battery or a lead-acid battery.

[0045] In one embodiment, a pressure sensor can be installed on the end cap of the battery under test to collect the pressure in the pressure relief channel of the lithium-ion battery, that is, the pressure inside the battery under test.

[0046] For example, the barometric pressure sensor and the end cap of the battery under test can be connected by rotating the threads of the barometric pressure sensor into the hollow aluminum alloy screw tube of the end cap of the battery under test, and covering the tail of the threads of the barometric pressure sensor with excess sealant to ensure a seal.

[0047] Optionally, the battery management system (BMS) can be connected via RS485 protocol, and the pressure inside the battery under test can be uploaded to the BMS for storage. This data can then be managed and analyzed by the BMS.

[0048] S202, determine the pressure vector to be measured based on the pressure to be measured.

[0049] In one embodiment, the pressure vector to be measured can be determined based on the pressure to be measured and the state of charge (SOC) of the battery to be measured. The SOC of the battery to be measured can be used as an index or label of the pressure vector to be measured, and the pressure to be measured can be used as the element corresponding to the index or label in the pressure vector to be measured, so as to obtain the pressure vector to be measured.

[0050] Alternatively, the pressure vector to be measured can be determined based on the pressure to be measured and the measurement time. The measurement time of the battery under test can be used as the index or label of the pressure vector to be measured, and the pressure to be measured can be used as the element corresponding to the index or label in the pressure vector to be measured, so as to obtain the pressure vector to be measured.

[0051] S203, determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions.

[0052] For example, a standard test condition could be a 1 / 3C charge / discharge condition, where C represents the battery capacity or charge / discharge rate.

[0053] In this embodiment, the historical pressure of the battery under test under standard test conditions can be determined, and a standard pressure vector can be determined based on the historical pressure and the state of charge of the battery under test. The state of charge of the battery under test can be used as the index or label of the standard pressure vector, and the historical pressure can be used as the element corresponding to the index or label in the standard pressure vector to obtain the standard pressure vector.

[0054] Optionally, the cosine similarity between the pressure vector to be measured and the standard pressure vector under the standard test conditions can be determined, and this cosine similarity can be used as the similarity between the pressure vector to be measured and the standard pressure vector under the standard test conditions.

[0055] Alternatively, the Euclidean distance between the pressure vector to be measured and the standard pressure vector under standard test conditions can be determined, and this Euclidean distance can be used as the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions.

[0056] S204. Based on similarity and preset threshold, determine the thermal runaway early warning result of the battery under test.

[0057] Optionally, the preset threshold may include preset similarity and / or preset similarity change rate.

[0058] In one embodiment, if the preset threshold includes a preset similarity and a preset similarity change rate, then if the similarity is greater than the preset similarity and the similarity change rate is greater than the preset similarity change rate, the thermal runaway warning result is determined to be an abnormality of the battery under test.

[0059] Alternatively, if the preset threshold includes a preset similarity, then if the similarity is greater than the preset similarity, the thermal runaway warning result is determined to be an anomaly of the battery under test.

[0060] Alternatively, if the preset threshold includes the preset similarity change rate, then if the similarity change rate is greater than the preset similarity change rate, the thermal runaway warning result is determined to be an anomaly of the battery under test.

[0061] In one possible implementation, Figure 1 The computer equipment is equipped with a battery management system. When a change in the internal pressure of the battery under test is detected, a preset wake-up signal can be sent to the battery management system to wake up the battery management system to obtain the internal pressure of the battery under test in the energy storage system and to execute subsequent thermal runaway warning steps.

[0062] In this embodiment, the test pressure inside the battery under test in the energy storage system is obtained, the test pressure vector is determined based on the test pressure, the similarity between the test pressure vector and the standard pressure vector under standard test conditions is determined, and then the thermal runaway warning result of the battery under test is determined based on the similarity and a preset threshold. Thus, thermal runaway warning can be performed by studying the characteristics of internal pressure changes in the battery, which improves the accuracy of thermal runaway warning and enhances the safety and reliability of the energy storage system.

[0063] Based on the above embodiments, S202 includes the following steps:

[0064] The pressure vector to be measured is determined based on the pressure to be measured and the state of charge of the battery to be measured.

[0065] In one embodiment, the state of charge of the battery under test can be used as the index or label of the pressure vector to be measured, and the pressure to be measured can be used as the element corresponding to the index in the pressure vector to be measured, so as to obtain the pressure vector to be measured.

[0066] In this embodiment, the pressure vector to be measured can be determined based on the pressure to be measured and the state of charge of the battery to be measured. This allows for the determination of the internal pressure change characteristics of the battery by studying the relationship between the pressure to be measured and the state of charge, thereby improving the accuracy of thermal runaway early warning and enhancing the safety and reliability of the energy storage system.

[0067] Based on the above embodiments, the preset threshold includes a preset similarity, and S204 above includes the following steps:

[0068] If the similarity is greater than the preset similarity, the thermal runaway warning result of the battery under test is determined to be an anomaly of the battery under test.

[0069] In one embodiment, if the similarity is greater than a preset similarity, the thermal runaway warning result of the battery under test can be determined as an anomaly of the battery under test.

[0070] Alternatively, if the similarity is greater than the preset similarity and the rate of change of the similarity is greater than the preset rate of change of the similarity, the thermal runaway warning result can be determined as an anomaly of the battery under test.

[0071] Optionally, the cosine similarity between the pressure vector to be tested and the standard pressure vector under standard test conditions can be used as the similarity. The preset similarity can be the preset cosine similarity. If the cosine similarity is greater than the preset cosine similarity, the thermal runaway warning result of the battery under test can be determined as an anomaly of the battery under test.

[0072] In this embodiment, if the similarity is greater than a preset similarity, the thermal runaway warning result of the battery under test can be determined as an abnormality of the battery under test. This allows for setting a preset similarity based on actual conditions and promptly determining the abnormality of the battery under test when the similarity is greater than the preset similarity. This enables timely handling of the abnormality of the battery under test, reduces the probability of thermal runaway events, and improves the safety and reliability of the energy storage system.

[0073] Based on the above embodiments, the preset threshold also includes a preset similarity change rate, and S204 above further includes the following steps:

[0074] If the similarity is greater than the preset similarity and the rate of change of similarity is greater than the preset rate of change of similarity, then the thermal runaway warning result is determined to be an anomaly of the battery under test.

[0075] The similarity change rate is determined by the quotient of the change in similarity divided by the change in time. The change in similarity is equal to the difference between the previous similarity and the current similarity. The change in time is equal to the difference between the time point corresponding to the current similarity and the time point corresponding to the previous similarity.

[0076] In one embodiment, the accuracy of the thermal runaway warning result is low because the similarity is determined by comparing it with the preset similarity. In other words, if the similarity is greater than the preset similarity, the battery under test may not necessarily be abnormal. Therefore, using the preset similarity as the condition for thermal runaway warning cannot meet the needs of thermal runaway warning.

[0077] In this embodiment, after determining the similarity between the current pressure vector to be measured and the standard pressure vector, the similarity change rate can be determined based on the current similarity and the previous similarity. If the similarity is greater than a preset similarity, the similarity change rate is compared with the preset similarity change rate. If the similarity change rate is greater than the preset similarity change rate, the thermal runaway warning result is determined to be an anomaly of the battery under test. The previous similarity refers to the similarity obtained in the previous measurement.

[0078] It should be noted that in this implementation, if the similarity is greater than the preset similarity and the rate of change of similarity is not greater than the preset rate of change of similarity, then the thermal runaway warning result is determined to be that the battery under test has not shown any abnormality.

[0079] Optionally, the rate of change of similarity can be the rate of increase of similarity, that is, the slope of the similarity-time curve can be used as the rate of change of similarity.

[0080] In this embodiment, if the similarity is greater than a preset similarity and the rate of change of similarity is greater than a preset rate of change of similarity, then the thermal runaway warning result is determined to be an anomaly of the battery under test. By considering the similarity and rate of change of similarity between the pressure vector under test and the standard pressure vector, the anomaly of the battery under test is determined, so that timely measures can be taken to deal with the anomaly of the battery under test, reducing the probability of thermal runaway events, further improving the accuracy of thermal runaway warning, as well as the safety and reliability of the energy storage system.

[0081] Reference Figure 3 , Figure 3 This is a flowchart illustrating a control command sending method provided in an embodiment of this application. Based on the above embodiment, the method further includes the following steps:

[0082] S301 generates control commands when the thermal runaway warning result indicates that the battery under test is abnormal.

[0083] In one embodiment, a thermal runaway warning signal can be generated if the thermal runaway warning result indicates an abnormality in the battery under test. Control commands can be generated when a thermal runaway warning signal is detected.

[0084] Thermal runaway warning signals may include, for example, audible and visual alarms and / or remote notifications.

[0085] S302 sends control commands to the control equipment of the energy storage system.

[0086] Among them, the control command is used to instruct the control equipment to power down the energy storage system and to open the valve to vent the battery under test.

[0087] Optionally, control commands can be sent to the control equipment of the energy storage system. After receiving the control commands, the control equipment can force the entire energy storage system to power down and open the valve to vent the battery under test.

[0088] In one embodiment, during the process of venting the battery under test by opening the valve, the air pressure data of the battery under test can be monitored in real time. When the air pressure data of the battery under test returns to normal, venting is stopped and the valve is closed.

[0089] In this embodiment, when the thermal runaway warning result indicates that the battery under test is abnormal, a control command is generated and sent to the control device of the energy storage system to instruct the control device to power down the energy storage system and open the valve to vent the battery under test. This enables the battery under test with the risk of thermal runaway to be processed, reducing the probability of thermal runaway and improving the safety and reliability of the energy storage system.

[0090] Based on the above embodiments, S203 includes the following steps:

[0091] Determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and use the cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

[0092] In this embodiment, the cosine similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions can be determined, and this cosine similarity can be used as the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions. This can improve the accuracy of thermal runaway early warning and thus improve the safety and reliability of the energy storage system.

[0093] Reference Figure 4 , Figure 4 This is a flowchart illustrating a method for early warning and control of thermal runaway based on the internal gas pressure of a prismatic lithium battery, as provided in an embodiment of this application. The method includes the following steps:

[0094] S401, obtain the pressure inside the battery under test in the energy storage system.

[0095] S402, determine the pressure vector to be measured based on the pressure to be measured and the state of charge of the battery to be measured.

[0096] S403, determine the cosine similarity between the pressure vector to be measured and the standard pressure vector.

[0097] S404. If the cosine similarity is greater than the preset similarity and the rate of change of the cosine similarity is greater than the preset rate of change of the similarity, then the thermal runaway warning result is determined to be an abnormality of the battery under test.

[0098] S405 generates control commands when the thermal runaway warning result indicates that the battery under test is abnormal.

[0099] S406 sends a control command to the control equipment of the energy storage system to instruct the control equipment to power down the energy storage system and to open the valve to vent the battery under test.

[0100] To provide a clearer description of the embodiments of this application, the following is combined with... Figure 5-6 An illustrative example is provided. Figure 5 This is a schematic diagram of a warning point for lateral heating provided in an embodiment of this application. Figure 6 This is a schematic diagram of an overcharge warning point provided in an embodiment of this application. Taking lateral heating and overcharging as examples, a preset cosine similarity and a preset cosine similarity change rate (i.e., Figure 5 and Figure 6 The slope of the curve shown is used to determine the warning point, and a control command is generated when the similarity of the battery under test exceeds the warning point. For example... Figure 5As shown, the preset cosine similarity is 0.9, and the preset cosine similarity change rate is 0.001 / s. Figure 6 As shown, the preset cosine similarity is 0.8, and the preset cosine similarity change rate is 0.002 / s.

[0101] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0102] Based on the same inventive concept, this application also provides a thermal runaway early warning device for implementing the thermal runaway early warning method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more thermal runaway early warning device embodiments provided below can be found in the limitations of the thermal runaway early warning method described above, and will not be repeated here.

[0103] In one embodiment, such as Figure 7 As shown, Figure 7 This is a structural block diagram of a thermal runaway early warning device provided in an embodiment of this application. The device 700 includes:

[0104] The acquisition module 701 is used to acquire the pressure inside the battery under test in the energy storage system.

[0105] The first determining module 702 is used to determine the pressure vector to be measured based on the pressure to be measured.

[0106] The second determining module 703 is used to determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions.

[0107] The third determining module 704 is used to determine the thermal runaway early warning result of the battery under test based on similarity and preset threshold.

[0108] In one embodiment, the first determining module 702 includes:

[0109] The first determining unit is used to determine the pressure vector to be measured based on the pressure to be measured and the state of charge of the battery to be measured.

[0110] In one embodiment, the preset threshold includes a preset similarity, and the third determining module 704 includes:

[0111] The second determining unit is used to determine the thermal runaway warning result of the battery under test as an abnormality when the similarity is greater than the preset similarity.

[0112] In one embodiment, the preset threshold further includes a preset similarity change rate, and the third determining module 704 includes:

[0113] The third determining unit is used to determine the thermal runaway warning result as an abnormality of the battery under test if the similarity is greater than the preset similarity and the similarity change rate is greater than the preset similarity change rate.

[0114] The similarity change rate is determined by the quotient of the change in similarity divided by the change in time. The change in similarity is equal to the difference between the previous similarity and the current similarity. The change in time is equal to the difference between the time point corresponding to the current similarity and the time point corresponding to the previous similarity.

[0115] In one embodiment, the device 700 further includes:

[0116] The fourth determination module is used to generate control commands when the thermal runaway warning result indicates that the battery under test is abnormal.

[0117] The transmitting module is used to send control commands to the control equipment of the energy storage system; the control commands are used to instruct the control equipment to power down the energy storage system and to open the valve to vent the battery under test.

[0118] In one embodiment, the second determining module 703 includes:

[0119] The fourth determining unit is used to determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and to use the cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

[0120] Each module in the aforementioned thermal runaway early warning device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0121] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0122] Obtain the pressure of the battery under test in the energy storage system.

[0123] Determine the pressure vector to be measured based on the pressure to be measured.

[0124] Determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions;

[0125] Based on similarity and preset thresholds, the thermal runaway early warning result of the battery under test is determined.

[0126] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0127] The pressure vector to be measured is determined based on the pressure to be measured and the state of charge of the battery to be measured. In one embodiment, the processor, when executing the computer program, further implements the following steps:

[0128] If the similarity is greater than the preset similarity, the thermal runaway warning result of the battery under test is determined to be an anomaly of the battery under test.

[0129] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0130] If the similarity is greater than the preset similarity and the rate of change of similarity is greater than the preset rate of change of similarity, then the thermal runaway warning result is determined to be an abnormality of the battery under test.

[0131] The similarity change rate is determined by the quotient of the change in similarity divided by the change in time. The change in similarity is equal to the difference between the previous similarity and the current similarity. The change in time is equal to the difference between the time point corresponding to the current similarity and the time point corresponding to the previous similarity.

[0132] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0133] If the thermal runaway warning result indicates that the battery under test is abnormal, a control command is generated.

[0134] Send control commands to the control equipment of the energy storage system; the control commands are used to instruct the control equipment to power down the energy storage system and to open the valve to vent the battery under test.

[0135] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0136] Determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and use the cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

[0137] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0138] Obtain the pressure of the battery under test in the energy storage system.

[0139] Determine the pressure vector to be measured based on the pressure to be measured.

[0140] Determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions;

[0141] Based on similarity and preset thresholds, the thermal runaway early warning result of the battery under test is determined.

[0142] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0143] The pressure vector to be measured is determined based on the pressure to be measured and the state of charge of the battery to be measured.

[0144] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0145] If the similarity is greater than the preset similarity, the thermal runaway warning result of the battery under test is determined to be an anomaly of the battery under test.

[0146] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0147] If the similarity is greater than the preset similarity and the rate of change of similarity is greater than the preset rate of change of similarity, then the thermal runaway warning result is determined to be an abnormality of the battery under test.

[0148] The similarity change rate is determined by the quotient of the change in similarity divided by the change in time. The change in similarity is equal to the difference between the previous similarity and the current similarity. The change in time is equal to the difference between the time point corresponding to the current similarity and the time point corresponding to the previous similarity.

[0149] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0150] If the thermal runaway warning result indicates that the battery under test is abnormal, a control command is generated.

[0151] Send control commands to the control equipment of the energy storage system; the control commands are used to instruct the control equipment to power down the energy storage system and to open the valve to vent the battery under test.

[0152] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0153] Determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and use the cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

[0154] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0155] Obtain the pressure of the battery under test in the energy storage system.

[0156] Determine the pressure vector to be measured based on the pressure to be measured.

[0157] Determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions;

[0158] Based on similarity and preset thresholds, the thermal runaway early warning result of the battery under test is determined.

[0159] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0160] The pressure vector to be measured is determined based on the pressure to be measured and the state of charge of the battery to be measured.

[0161] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0162] If the similarity is greater than the preset similarity, the thermal runaway warning result of the battery under test is determined to be an anomaly of the battery under test.

[0163] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0164] If the similarity is greater than the preset similarity and the rate of change of similarity is greater than the preset rate of change of similarity, then the thermal runaway warning result is determined to be an abnormality of the battery under test.

[0165] The similarity change rate is determined by the quotient of the change in similarity divided by the change in time. The change in similarity is equal to the difference between the previous similarity and the current similarity. The change in time is equal to the difference between the time point corresponding to the current similarity and the time point corresponding to the previous similarity.

[0166] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0167] If the thermal runaway warning result indicates that the battery under test is abnormal, a control command is generated.

[0168] Send control commands to the control equipment of the energy storage system; the control commands are used to instruct the control equipment to power down the energy storage system and to open the valve to vent the battery under test.

[0169] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0170] Determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and use the cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

[0171] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media 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), magnetic 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 can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0172] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0173] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for early warning of thermal runaway, characterized in that, The method includes: Obtain the pressure of the battery under test in the energy storage system. Determine the pressure vector to be measured based on the pressure to be measured. Determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions; Based on the similarity and the preset threshold, the thermal runaway early warning result of the battery under test is determined.

2. The method according to claim 1, characterized in that, The step of determining the pressure vector based on the pressure to be measured includes: The pressure vector to be measured is determined based on the pressure to be measured and the state of charge of the battery to be measured.

3. The method according to claim 1, characterized in that, The preset threshold includes a preset similarity, and determining the thermal runaway early warning result of the battery under test based on the similarity and the preset threshold includes: If the similarity is greater than the preset similarity, the thermal runaway warning result of the battery under test is determined to be an anomaly of the battery under test.

4. The method according to claim 3, characterized in that, The preset threshold also includes a preset similarity change rate. Determining the thermal runaway early warning result of the battery under test based on the similarity and the preset threshold includes: If the similarity is greater than the preset similarity and the rate of change of similarity is greater than the preset rate of change of similarity, then the thermal runaway warning result is determined to be an anomaly of the battery under test. The similarity change rate is determined by the quotient of the similarity change amount divided by the time change amount. The similarity change amount is equal to the difference between the similarity and the previous similarity, and the time change amount is equal to the difference between the time point corresponding to the similarity and the time point corresponding to the previous similarity.

5. The method according to claim 4, characterized in that, The method further includes: If the thermal runaway warning result indicates that the battery under test is abnormal, a control command is generated. The control command is sent to the control device of the energy storage system; the control command is used to instruct the control device to power down the energy storage system and to open the valve to vent the battery under test.

6. The method according to any one of claims 1-5, characterized in that, Determining the similarity between the pressure vector to be measured and the standard pressure vector includes: Determine the cosine similarity between the pressure vector to be measured and the standard pressure vector, and use the cosine similarity as the similarity between the pressure vector to be measured and the standard pressure vector.

7. A thermal runaway early warning device, characterized in that, The device includes: The acquisition module is used to acquire the pressure of the battery under test inside the energy storage system. The first determining module is used to determine the pressure vector to be measured based on the pressure to be measured. The second determining module is used to determine the similarity between the pressure vector to be measured and the standard pressure vector under standard test conditions; The third determining module is used to determine the thermal runaway early warning result of the battery under test based on the similarity and the preset threshold.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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