Control method and device, electronic equipment and storage medium

Abstract

The invention provides a control method and device, electronic equipment and a storage medium, and the method comprises the steps: monitoring the temperature of a battery pack, obtaining environment parameters related to the battery pack under the condition that the temperature meets a preset thermal runaway condition, and avoiding the delay limitation of starting a cooling device only through temperature judgment; the state information of the environment where the battery pack is located is determined based on the environment parameters and the pre-trained prediction model, the environment state can be evaluated based on a machine learning model, and the situation that the fire out-of-control risk is misjudged, and consequently resource waste of a cooling device is caused is avoided; under the condition that the state information represents that the environment where the battery pack is located is in the abnormal state, the target cooling device is controlled to be in the starting state based on the temperature of the battery pack, and compared with a single temperature signal or a single environment parameter, the accuracy of fire out-of-control risk judgment can be improved; therefore, the technical problem that a fire out-of-control risk exists under the condition that the battery pack triggers the thermal out-of-control condition is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, and in particular to a control method and device, electronic equipment and a storage medium. BACKGROUND

[0002] In the process of testing the thermal runaway of a battery pack, the battery pack is continuously heated, and the temperature of the battery gradually rises. When the temperature inside the battery pack rises to a certain level, the thermal runaway condition of the battery pack is triggered. However, in the case where the battery pack triggers the thermal runaway condition, there is a risk of fire out of control. SUMMARY

[0003] Embodiments of the present application provide a control method, device, electronic equipment and storage medium, which can solve the technical problem of the risk of fire out of control in the case where the battery pack triggers the thermal runaway condition.

[0004] In a first aspect, embodiments of the present application provide a control method applied to a battery pack thermal runaway test system; the battery pack thermal runaway test system includes a heating device and a target cooling device; the target cooling device surrounds the battery pack; the heating device includes at least a first heating device and a second heating device connected in parallel; one end of the battery pack is connected to the first heating device, and the other end is connected to the second heating device; the first heating device and the second heating device are used to heat the battery pack; the target cooling device is used to cool the battery pack; the method comprises:

[0005] monitoring the temperature of the battery pack;

[0006] in the case where the temperature meets a preset thermal runaway condition, obtaining an environmental parameter related to the battery pack;

[0007] determining state information of the environment in which the battery pack is located based on the environmental parameter and a pre-trained prediction model;

[0008] in the case where the state information indicates that the environment in which the battery pack is located is in an abnormal state, controlling the target cooling device to be in an open state based on the temperature of the battery pack, so that the temperature of the battery pack is less than or equal to a preset target temperature threshold.

[0009] Here, by monitoring the temperature of the battery pack, in the case that the temperature meets the preset thermal runaway condition, the environmental parameters related to the battery pack are obtained, which can realize the use of environmental parameters as early cooling device opening influencing factors, avoid the delay limitation of opening the cooling device only by temperature judgment; by determining the state information of the environment where the battery pack is located based on the environmental parameters and the pre-trained prediction model, the environmental state can be evaluated based on the machine learning model, which can avoid misjudgment of fire runaway risk and cause waste of cooling device resources; by controlling the target cooling device to be in an open state based on the temperature of the battery pack when the state information represents that the environment where the battery pack is located is in an abnormal state, compared with a single temperature signal or a single environmental parameter, the accuracy of fire runaway risk discrimination can be improved, thereby solving the technical problem that there is a fire runaway risk when the battery pack triggers a thermal runaway condition.

[0010] In an embodiment, the target cooling device at least includes a first cooling device for cooling the outside of the battery pack; the temperature of the battery pack includes a first temperature parameter; and the control of the target cooling device to be in an open state based on the temperature of the battery pack includes:

[0011] obtaining the first temperature parameter of the battery pack;

[0012] when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold, controlling the first cooling device to be in an open state, so that the temperature of the battery pack is less than or equal to the target temperature threshold; and the first temperature threshold is greater than the target temperature threshold.

[0013] Here, the environmental parameters are used as the cooling device opening influencing factors, and the first temperature parameter outside the battery pack is monitored, which can realize multiple protections of fire runaway risk through the combination of environmental parameters and temperature parameters, and more effectively control the fire runaway risk of the battery pack.

[0014] In an embodiment, the target cooling device further includes a second cooling device for cooling the inside of the battery pack; the temperature of the battery pack further includes a second temperature parameter; and the obtaining of the environmental parameters related to the battery pack includes:

[0015] obtaining the second temperature parameter of the battery pack;

[0016] when the value of the second temperature parameter is greater than or equal to a preset second temperature threshold, determining the second cooling device in the battery pack to be in an open state; and the second temperature threshold is greater than the target temperature threshold.

[0017] obtaining a first duration of the second cooling device being in an open state;

[0018] acquire the environmental parameter when the first duration is greater than or equal to a preset first threshold.

[0019] Here, in the case where the temperature meets the preset thermal runaway condition, by monitoring the second temperature parameter inside the battery pack, judging whether to start the second cooling device based on the value of the second temperature parameter, and judging whether to acquire the environmental parameter related to the battery pack based on the duration that the second cooling device is in the started state, the fire runaway risk in the early stage can be responded quickly, and in the case where the cooling device inside the battery pack cannot effectively cool the battery pack, the environmental parameter is used as a starting factor of the cooling device to perform multiple protection on the fire runaway risk, and the fire runaway risk of the battery pack is more effectively controlled.

[0020] In an embodiment, the target cooling device further includes a third cooling device for spraying cooling the battery pack; after the first cooling device is controlled to be in the started state, the method further includes:

[0021] acquiring a second duration that the first cooling device is in the started state;

[0022] controlling the third cooling device to be in the started state when the second duration is greater than or equal to a preset second threshold, so that the temperature of the battery pack is less than or equal to the target temperature threshold.

[0023] Here, in the case where the temperature meets the preset thermal runaway condition, whether the temperature outside the battery pack is cooled to below the target temperature threshold in which there is no fire runaway risk is judged based on the duration that the first cooling device is in the started state, in the case where the cooling device outside the battery pack cannot effectively cool the battery pack, the third cooling device is controlled to be in the started state to spray cooling the battery pack, multiple protection is performed on the fire runaway risk, and the fire runaway risk of the battery pack is more effectively controlled.

[0024] In an embodiment, the method further includes:

[0025] acquiring a historical environmental parameter related to the battery pack and historical state information of an environment in which the battery pack is located corresponding to each environmental parameter in the historical environmental parameter; the historical environmental parameter includes at least one of a historical smoke concentration, a historical gas composition, and a historical gas concentration;

[0026] training a prediction model to be optimized based on the historical environmental parameter and the historical state information to obtain a trained prediction model;

[0027] When the trained prediction model converges, the trained prediction model is recorded and stored.

[0028] Here, by determining the state information of the environment where the battery pack is located based on the environmental parameters and the pre-trained prediction model, the machine learning model-based evaluation of the environmental state can be realized, the misjudgment of the fire out-of-control risk can be avoided, and the resource waste of the cooling device can be reduced.

[0029] In an embodiment, the method further comprises:

[0030] monitoring a first temperature value at one end of the battery pack and a second temperature value at the other end of the battery pack;

[0031] if the first temperature value is greater than the second temperature value, controlling the first heating power of the first heating device to be less than the second heating power of the second heating device;

[0032] Alternatively, if the first temperature value is less than or equal to the second temperature value, the first heating power is greater than or equal to the second heating power.

[0033] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell in the battery pack to be the same or different, the temperature consistency at both ends of the battery cell in the battery pack is ensured, and the accuracy of the battery thermal runaway test is effectively improved.

[0034] In an embodiment, the method further comprises:

[0035] determining a rate parameter of temperature rise of the battery pack based on the temperature of the battery pack;

[0036] determining whether the rate parameter meets the thermal runaway condition to obtain a determination result;

[0037] if the determination result indicates that the rate parameter meets the thermal runaway condition, controlling the first heating device and the second heating device to stop the thermal runaway test on the battery pack.

[0038] Here, if the determination result indicates that the rate parameter meets the thermal runaway condition, there is a fire out-of-control risk in the battery thermal runaway test process, and the first heating device and the second heating device need to be controlled to stop the thermal runaway test on the battery pack. By determining the cutoff condition of the battery thermal runaway test, the heating is automatically stopped, which greatly reduces the workload of personnel and saves labor costs.

[0039] Secondly, embodiments of the present invention provide a control device applied to a battery pack thermal runaway testing system; the battery pack thermal runaway testing system includes a heating device and a target cooling device; the target cooling device surrounds the battery pack; the heating device includes at least a first heating element and a second heating element connected in parallel; one end of the battery pack is connected to the first heating element and the other end is connected to the second heating element; the first heating element and the second heating element are used to heat the battery pack; the control device is connected to the heating device and the target cooling device respectively;

[0040] The control device is used to monitor the temperature of the battery pack; when the temperature meets the preset thermal runaway conditions, it acquires environmental parameters related to the battery pack; and controls the target cooling device to be turned on based on the environmental parameters and the temperature.

[0041] The target cooling device is used to cool the battery pack so that the temperature of the battery pack is less than or equal to a preset target temperature threshold.

[0042] Thirdly, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method when executing the computer program.

[0043] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program configured to be executed by a processor to implement the control method described above.

[0044] In embodiments of the present invention, by monitoring the temperature of the battery pack, and when the temperature meets preset thermal runaway conditions, environmental parameters related to the battery pack are obtained. This allows the use of environmental parameters as an early influencing factor for activating the cooling device, avoiding the delay limitation of relying solely on temperature to determine the activation of the cooling device. By determining the state information of the environment in which the battery pack is located based on the environmental parameters and a pre-trained prediction model, the environmental state can be evaluated based on a machine learning model, avoiding misjudgment of fire runaway risk and resulting in wasted resources of the cooling device. By controlling the target cooling device to be activated based on the temperature of the battery pack when the state information indicates that the environment in which the battery pack is located is in an abnormal state, compared to a single temperature signal or a single environmental parameter, the accuracy of fire runaway risk assessment is improved, thereby solving the technical problem of fire runaway risk when the battery pack triggers thermal runaway conditions. Attached Figure Description

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort based on these drawings also belong to the protection scope of the present application. In addition, it should be understood that the specific embodiments described here are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawings. The "inner" and "outer" are relative to the outline of the device.

[0046] Figure 1 The flowchart of the control method provided for the embodiments of the present application is shown in

[0047] Figure 2 The connection diagram of the control device and the battery pack thermal runaway test system provided for the embodiments of the present application is shown in

[0048] Figure 3 The connection diagram of the control device and the battery pack thermal runaway test system provided for the embodiments of the present application is shown in

[0049] Figure 4 The flowchart of another control method provided for the embodiments of the present application is shown in

[0050] Figure 5 The hardware structure diagram of an electronic device provided for the embodiments of the present application is shown in DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, and are not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application. In addition, it should be understood that the specific embodiments described here are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawings. The "inner" and "outer" are relative to the outline of the device.

[0052] Figure 1 The flowchart of the control method provided for the embodiments of the present application is shown in Figure 1 As shown in the figure, the control method is applied to a battery pack thermal runaway test system. The battery pack thermal runaway test system includes a heating device and a target cooling device. The target cooling device surrounds the battery pack. The heating device at least includes a first heating device and a second heating device connected in parallel. One end of the battery pack is connected with the first heating device, and the other end is connected with the second heating device. The first heating device and the second heating device are used for heating the battery pack. The target cooling device is used for cooling the battery pack. The method includes steps 101-104.

[0053] Step 101: monitoring the temperature of the battery pack.

[0054] Exemplarily, the battery pack can include a plurality of modules; the battery pack thermal runaway test system can include a temperature detection device, which can acquire the temperature of the battery pack in real time, wherein the temperature detection device can be a contact or non-contact sensor, which is not limited here.

[0055] Step 102: acquiring an environmental parameter related to the battery pack when the temperature meets a preset thermal runaway condition.

[0056] Exemplarily, the thermal runaway condition can be a thermal runaway cutoff condition, which can be determined according to actual conditions. As an example, a value of a temperature rise rate parameter of the battery pack can be compared with a temperature rise rate threshold to obtain a rate comparison result, and it is determined whether the temperature meets the thermal runaway condition according to the rate comparison result.

[0057] Exemplarily, the environmental parameter includes at least one of a smoke concentration, a gas composition, and a gas concentration. The smoke concentration can be detected by a photoelectric detector to detect the concentration of particles in the environment, the gas composition can be detected by an electrochemical sensor to detect whether there is a gas related to fire, such as carbon monoxide, in the environment, and the gas concentration can be detected by an infrared absorption sensor to detect the concentration of carbon dioxide in the environment.

[0058] Here, by monitoring the temperature of the battery pack and acquiring an environmental parameter related to the battery pack when the temperature meets a preset thermal runaway condition, the environmental parameter can be used as an early cooling device opening influencing factor, and the delay limitation of opening the cooling device by temperature judgment alone can be avoided.

[0059] In an embodiment, the target cooling device further includes a second cooling device for cooling the inside of the battery pack; the temperature of the battery pack further includes a second temperature parameter; and acquiring the environmental parameter related to the battery pack includes:

[0060] acquiring the second temperature parameter of the battery pack;

[0061] when the value of the second temperature parameter is greater than or equal to a preset second temperature threshold, determining that the second cooling device in the battery pack is in an open state; and the second temperature threshold is greater than the target temperature threshold.

[0062] acquiring a first duration for which the second cooling device is in the open state;

[0063] when the first duration is greater than or equal to a preset first threshold, acquiring the environmental parameter.

[0064] Exemplarily, the temperature detection device comprises a first temperature detector arranged inside the battery pack, and the process of obtaining the second temperature parameter of the battery pack can be that the first temperature detector monitors the second temperature parameter inside the battery pack in real time when the temperature meets the preset thermal runaway condition. The second temperature threshold can be a minimum temperature value at which the battery pack can have a risk of fire runaway, which is not limited herein. The second cooling device can be a fire extinguishing device inside the battery pack, which is not limited herein.

[0065] Exemplarily, when the value of the second temperature parameter is greater than or equal to the preset second temperature threshold, it indicates that the battery pack can have a risk of fire runaway, and the second cooling device in the battery pack is started to cool the inside of the battery pack so that the temperature of the battery pack is less than or equal to a preset target temperature threshold. The second cooling device can be started in response to a control instruction of the control device, or can be started in response to a control instruction of the battery pack, which is not limited herein.

[0066] The target temperature threshold can be a maximum temperature value at which the battery pack does not have a risk of fire runaway. It can be understood that the minimum temperature value at which the battery pack has a risk of fire runaway is at least greater than the maximum temperature value at which the battery pack does not have a risk of fire runaway.

[0067] Exemplarily, the first duration in which the second cooling device is in the started state can be that a hardware timer is triggered based on a first cooling signal to accumulate the duration in which the second cooling device is in the started state, to obtain the first duration. The first cooling signal can be a signal generated by the control device when the value of the second temperature parameter is greater than or equal to the preset second temperature threshold.

[0068] Exemplarily, the first threshold can be a maximum duration in which the second cooling device inside the battery pack works alone. As an example, the first threshold can be 15-20 seconds. When the first duration is greater than or equal to the preset first threshold, it indicates that the value of the second temperature parameter inside the battery pack is still greater than the second temperature threshold, and the battery pack still has a risk of fire runaway, and in this case, the environmental parameter related to the battery pack needs to be obtained.

[0069] Here, when the temperature meets the preset thermal runaway condition, the second temperature parameter inside the battery pack is monitored, whether to start the second cooling device is determined based on the value of the second temperature parameter, and whether to obtain the environmental parameter related to the battery pack is determined based on the duration in which the second cooling device is in the started state, which can quickly respond to the risk of fire runaway inside the battery pack in the early stage of the risk of fire runaway, and in the case that the cooling device inside the battery pack cannot effectively cool the battery pack, the environmental parameter is used as an influencing factor for starting the cooling device to provide multiple protections for the risk of fire runaway, and the risk of fire runaway of the battery pack is more effectively controlled.

[0070] In an embodiment, the method further comprises:

[0071] determining a temperature rise rate parameter of the battery pack based on the temperature of the battery pack;

[0072] determining whether the temperature rise rate parameter meets a thermal runaway condition, to obtain a determination result;

[0073] if the determination result indicates that the temperature rise rate parameter meets the thermal runaway condition, controlling the first heating device and the second heating device to stop the thermal runaway test on the battery pack.

[0074] Exemplarily, the determining of the temperature rise rate parameter of the battery pack based on the temperature of the battery pack can comprise: obtaining a temperature of the battery pack at a first time and a temperature of the battery pack at a second time; performing a difference operation based on the temperature at the second time and the temperature at the first time to obtain a temperature difference; performing a difference operation based on the second time and the first time to obtain a time difference; and performing a division operation based on the temperature difference and the time difference to obtain the temperature rise rate parameter of the battery pack.

[0075] Exemplarily, the determining of whether the temperature rise rate parameter meets the thermal runaway condition can comprise: determining whether the value of the temperature rise rate parameter of the battery pack is greater than or equal to a temperature rise rate threshold; if the value of the temperature rise rate parameter of the battery pack is greater than or equal to the temperature rise rate threshold, the determination result indicates that the temperature rise rate parameter meets the thermal runaway condition; and if the value of the temperature rise rate parameter of the battery pack is less than the temperature rise rate threshold, the determination result indicates that the temperature rise rate parameter does not meet the thermal runaway condition. The temperature rise rate threshold can be 3℃ / s.

[0076] In some embodiments, a temperature rise curve of the battery pack can be determined according to the temperature rise rate parameter, wherein the slope of the temperature rise curve presents a 45° inclined upward trend when the temperature rise rate parameter does not meet the thermal runaway condition, and the slope of the temperature rise curve presents a 90° straight line upward trend when the temperature rise rate parameter meets the thermal runaway condition.

[0077] In some embodiments, the value of the temperature rise rate parameter of the battery pack can be determined whether it is greater than or equal to the temperature rise rate threshold in at least two sampling periods, and if the value of the temperature rise rate parameter of the battery pack is greater than or equal to the temperature rise rate threshold in the at least two sampling periods, it is determined that the temperature rise rate parameter meets the thermal runaway condition. The at least two sampling periods can be three continuous sampling periods.

[0078] In some embodiments, the battery pack thermal runaway test system can comprise a warning device, the warning device can be connected with the control device, the warning device is used to output a warning signal when the rate parameter meets the thermal runaway condition, and if the warning signal is output for at least two sampling periods, the first heating device and the second heating device are controlled to stop the thermal runaway test on the battery pack. For example, the warning device can be an indicator light, the warning signal can be the flashing of the indicator light, and if the indicator light flashes three times, the heating of the battery pack is stopped.

[0079] Here, if the judgment result represents that the rate parameter meets the thermal runaway condition, the battery pack thermal runaway test process has a risk of fire out of control, and the first heating device and the second heating device need to be controlled to stop the thermal runaway test on the battery pack. By determining the stopping condition of the battery pack thermal runaway test, the heating is automatically stopped, which greatly reduces the workload of personnel and saves labor costs.

[0080] In some embodiments, the voltage value of the battery pack can be obtained, the voltage value is compared with the voltage threshold value to obtain a voltage comparison result, and whether the voltage meets the thermal runaway condition is determined according to the voltage comparison result. Specifically, if the voltage comparison result represents that the voltage value is less than or equal to the voltage threshold value, it is determined that the voltage meets the thermal runaway condition; if the voltage comparison result represents that the voltage value is greater than the voltage threshold value, it is determined that the voltage does not meet the thermal runaway condition. The voltage threshold value can be 1V.

[0081] Step 103: determining the state information of the environment where the battery pack is located based on the environment parameter and the pre-trained prediction model.

[0082] For example, the state information can be a probability comparison result, the environment parameter can be predicted based on the pre-trained prediction model to obtain a prediction probability corresponding to the environment parameter, the prediction probability is compared with a probability threshold value to obtain a probability comparison result, if the prediction probability is less than the probability threshold value, the probability comparison result represents that the environment where the battery pack is located is not in an abnormal state; if the prediction probability is greater than or equal to the probability threshold value, the probability comparison result represents that the environment where the battery pack is located is in an abnormal state, wherein the probability threshold value can be determined according to actual conditions, which is not limited here.

[0083] Here, by determining the state information of the environment where the battery pack is located based on the environment parameter and the pre-trained prediction model, the environment state can be evaluated based on the machine learning model, and the risk of misjudging the fire out of control is avoided, which causes the waste of resources of the cooling device.

[0084] In an embodiment, the method further comprises:

[0085] acquire historical environment parameters related to the battery pack, and historical state information of an environment where the battery pack is located corresponding to each of the historical environment parameters; the historical environment parameters include at least one of historical smoke density, historical gas composition, and historical gas concentration;

[0086] train the to-be-optimized prediction model based on the historical environment parameters and the historical state information to obtain a trained prediction model;

[0087] When the trained prediction model converges, the trained prediction model is recorded and stored.

[0088] When training the model, first, training set sample data for training is acquired, and then the to-be-trained prediction model is trained and optimized through the training set sample data, and then a prediction model that can be used is obtained after the training is completed. Specifically, when training, first, historical environment parameters related to the battery pack collected are acquired, and each of the historical environment parameters corresponds to a historical state information of an environment where the battery pack is located, wherein the historical state information can be that the environment where the battery pack is located is in an abnormal state or not in an abnormal state, etc.

[0089] Based on the historical environment parameters and the historical state information, a training sample set for training the prediction model is constituted, and the historical environment parameters and the historical state information correspond one by one. After obtaining the training sample set, the obtained training sample set is input into the to-be-trained prediction model, so that the prediction model continuously learns and optimizes, and finally when the prediction model training is completed, such as convergence, the trained prediction model is recorded and stored.

[0090] In the use process of the prediction model, by inputting the environment parameters, the state information of the environment where the battery pack is located corresponding to the current situation is output, that is, the environment where the battery pack is located is in an abnormal state or not in an abnormal state, etc. can be obtained, the environment state can be evaluated based on the machine learning model, the risk of misjudging the fire out of control is avoided, and the resource waste of the temperature control target cooling device is avoided.

[0091] Step 104: In a case where the state information indicates that the environment where the battery pack is located is in an abnormal state, the temperature control target cooling device of the battery pack is in an open state, so that the temperature of the battery pack is less than or equal to a preset target temperature threshold.

[0092] Here, in a case where the state information indicates that the environment where the battery pack is located is in an abnormal state, the temperature control target cooling device of the battery pack is in an open state, and the temperature of the battery pack is cooled to below the target temperature threshold where there is no risk of fire out of control. Compared with a single temperature signal or a single environment parameter, the accuracy of the fire out of control risk discrimination can be improved.

[0093] In an embodiment, the target cooling device at least comprises a first cooling device for cooling the outside of the battery pack; the temperature of the battery pack comprises a first temperature parameter; the target cooling device is controlled to be in an open state based on the temperature of the battery pack, comprising:

[0094] The first temperature parameter of the battery pack is obtained.

[0095] When the value of the first temperature parameter is greater than or equal to a preset first temperature threshold, the first cooling device is controlled to be in an open state, so that the temperature of the battery pack is less than or equal to a target temperature threshold; the first temperature threshold is greater than the target temperature threshold.

[0096] Exemplarily, the temperature detection device comprises a second temperature detector arranged outside the battery pack, and the process of obtaining the first temperature parameter of the battery pack can be that the second temperature detector is used to monitor the first temperature parameter outside the battery pack in real time in a case where the state information indicates that the environment in which the battery pack is located is in an abnormal state. The first temperature threshold can be a minimum temperature value at which a fire out-of-control risk can exist outside the battery pack, which is not limited here. The first cooling device can be a fire extinguishing device outside the battery pack, the fire extinguishing device is an external device extending from a wall to the outside, a spray head of the fire extinguishing device is aimed at a test sample, the fire extinguishing device is capable of automatically identifying a flame and spraying a fire extinguishing agent to ensure the safety of personnel and property.

[0097] Exemplarily, when the value of the first temperature parameter is greater than or equal to the preset first temperature threshold, it indicates that a fire out-of-control risk can exist outside the battery pack, the first cooling device outside the battery pack is opened to cool the outside of the battery pack, so that the temperature of the battery pack is less than or equal to the preset target temperature threshold. The first cooling device can be opened in response to a control instruction of a response control device, which is not limited here. It can be understood that the minimum temperature value at which a fire out-of-control risk can exist outside the battery pack is at least greater than the maximum temperature value at which a fire out-of-control risk does not exist.

[0098] Here, the environmental parameter is used as an influencing factor for opening the cooling device, and the first temperature parameter outside the battery pack is monitored, so that the fire out-of-control risk is protected in multiple ways through the combination of the environmental parameter and the temperature parameter, and the fire out-of-control risk of the battery pack is more effectively controlled.

[0099] In an embodiment, the target cooling device further comprises a third cooling device for spraying cooling to the battery pack; after the first cooling device is controlled to be in an open state, the method further comprises:

[0100] A second time length during which the first cooling device is in the open state is obtained.

[0101] When the second duration is greater than or equal to the preset second threshold, the third cooling device is turned on to make the temperature of the battery pack less than or equal to the target temperature threshold.

[0102] For example, obtaining the second duration for which the first cooling device is in the on state can be achieved by triggering a hardware timer based on a second cooling signal to accumulate the duration for which the first cooling device is in the on state. The second cooling signal can be a signal generated by the control device when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold.

[0103] For example, the second threshold can be the longest duration for which the first cooling device outside the battery pack operates alone. The second threshold can be the same as or different from the first threshold, and this is not limited here. When the second duration is greater than or equal to the preset second threshold, the value of the first temperature parameter representing the outside of the battery pack is still greater than the first temperature threshold, and there is still a risk of fire runaway outside the battery pack. At this time, it is necessary to control the third cooling device to be turned on so that the temperature of the battery pack is cooled to below the target temperature threshold where there is no risk of fire runaway.

[0104] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack has been cooled to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device is in the on state. If the external cooling device cannot effectively cool the battery pack, the system controls the third cooling device to be in the on state to spray and cool the battery pack, providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack.

[0105] In some embodiments, after controlling the first fire extinguishing device to switch to the on state, the method further includes: obtaining a third temperature parameter of the battery pack; if the third temperature parameter is greater than or equal to a third temperature threshold, controlling the third fire extinguishing device to switch to the on state; the third temperature threshold is greater than or equal to a first temperature threshold.

[0106] For example, the temperature detection device further includes a third temperature detector, which is disposed outside the battery pack. The process of acquiring the third temperature parameter of the battery pack can be achieved by monitoring the third temperature parameter outside the battery pack in real time using the third temperature detector when the second duration of the first fire extinguishing device being in the activated state is greater than or equal to a preset second threshold. To activate the third cooling device if the temperature outside the battery pack further increases, the third temperature threshold can be a temperature value greater than the first temperature threshold, and is not limited here. The third cooling device can be a sprinkler fire extinguishing device outside the battery pack, and is not limited here.

[0107] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack has cooled down to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device is in the on state. If the external cooling device cannot effectively cool the battery pack or the fire is not fully controlled or there is a tendency for the fire to spread, the system controls the third cooling device to be in the on state to spray and cool the battery pack, providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack.

[0108] In one embodiment, the method further includes:

[0109] Monitor the first temperature value at one end of the battery pack and the second temperature value at the other end of the battery pack;

[0110] If the first temperature value is greater than the second temperature value, the first heating power of the first heating device is controlled to be less than the second heating power of the second heating device.

[0111] Alternatively, if the first temperature value is less than or equal to the second temperature value, the first heating power is controlled to be greater than or equal to the second heating power.

[0112] For example, the temperature detection device further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed at a first end of the battery cell in the battery pack and is used to detect a first temperature value of the battery cell in the battery pack. The second temperature sensor is disposed at a second end of the battery cell in the battery pack and is used to detect a second temperature value of the battery cell in the battery pack.

[0113] For example, the cells in the battery pack can be trigger cells. A trigger cell typically refers to a specific cell that reaches a preset trigger condition, thereby initiating a corresponding system response; this is not limited here. If the first temperature value is greater than the second temperature value, it indicates that the temperature at the first end of the cell in the battery pack is greater than the temperature at the second end of the cell in the battery pack, resulting in uneven heating of the cells in the battery pack. Therefore, the first heating power of the first heating device is controlled to be less than the second heating power of the second heating device. By increasing the second heating power of the second heating device, the temperature at the second end of the cell in the battery pack gradually rises until it matches the temperature at the first end of the cell in the battery pack.

[0114] For example, if the first temperature value is less than or equal to the second temperature value, it indicates that the temperature of the first end of the battery cell in the battery pack is less than or equal to the temperature of the second end of the battery cell in the battery pack, and the battery cell in the battery pack has a defect of uneven heating. Therefore, the first heating power of the first heating device is controlled to be greater than or equal to the second heating power of the second heating device. By increasing the first heating power of the first heating device, the temperature of the first end of the battery cell in the battery pack is gradually increased until it is consistent with the temperature of the second end of the battery cell in the battery pack.

[0115] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell in the battery pack to be the same or different, the temperature at both ends of the battery cell in the battery pack is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0116] Figure 2 This is a schematic diagram showing the connection between the control device and the battery pack thermal runaway test system provided in an embodiment of the present invention, as shown below. Figure 2 As shown, an embodiment of the present invention provides a control device 100 applied to a battery pack thermal runaway testing system 200; the battery pack thermal runaway testing system 200 includes a heating device 210 and a target cooling device 220; the target cooling device 220 surrounds the battery pack 300; the heating device 210 includes at least a first heating element 211 and a second heating element 212 connected in parallel; one end of the battery pack 300 is connected to the first heating element 211 and the other end is connected to the second heating element 212; the first heating element 211 and the second heating element 212 are used to heat the battery pack 300; the control device 100 is connected to the heating device 210 and the target cooling device 220 respectively.

[0117] The control device 100 is used to monitor the temperature of the battery pack 300; when the temperature meets the preset thermal runaway conditions, it acquires environmental parameters related to the battery pack 300; and controls the target cooling device 220 to be turned on based on the environmental parameters and temperature.

[0118] The target cooling device 220 is used to cool the battery pack 300 so that the temperature of the battery pack 300 is less than or equal to a preset target temperature threshold.

[0119] For example, the target cooling device 220 surrounding the battery pack 300 can be understood as the target cooling device 220 being disposed in the internal space, the circumferential external space, or the top external space of the battery pack 300, cooling the battery pack 300 from multiple directions. The first heating device 211 can be a first heating element; the second heating device 212 can be a second heating element. The first heating element and the second heating element can be attached to both ends of the battery pack 300. It can be understood that one end of the battery pack 300 is positioned opposite to the other end.

[0120] For example, the battery pack thermal runaway test system 200 may further include a temperature detection device for real-time acquisition of the temperature of the battery pack 300, and the control device 100 may monitor the temperature of the battery pack 300 through the temperature detection device. The battery pack thermal runaway test system 200 may also include an environmental detection device, such as a photoelectric detector, an electrochemical sensor, and an infrared absorption sensor.

[0121] Here, by monitoring the temperature of the battery pack 300, when the temperature meets the preset thermal runaway conditions, environmental parameters related to the battery pack 300 can be obtained. This allows the use of environmental parameters as an influencing factor for the early activation of the cooling device, avoiding the delay limitation of relying solely on temperature to determine the activation of the cooling device.

[0122] Here, by controlling the target cooling device 220 based on environmental parameters and the temperature of the battery pack 300 to be in the on state, the temperature of the battery pack 300 is cooled to below the target temperature threshold where there is no risk of fire runaway. Compared with a single temperature signal or a single environmental parameter, this can improve the accuracy of fire runaway risk assessment.

[0123] In one embodiment, Figure 3 This is another connection diagram of the control device and the battery pack thermal runaway test system provided in the embodiments of the present invention, as shown below. Figure 3 As shown, the target cooling device 220 includes at least a first cooling device 221, which is disposed in the circumferential outer space of the battery pack 300. The first cooling device 221 is used to cool the outside of the battery pack 300. The first cooling device 221 is connected to the control device 100. The temperature of the battery pack 300 includes a first temperature parameter.

[0124] The control device 100 is also used to acquire a first temperature parameter of the battery pack 300; when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold, the first cooling device 221 is controlled to be turned on so that the temperature of the battery pack 300 is less than or equal to the target temperature threshold; the first temperature threshold is greater than the target temperature threshold.

[0125] For example, the control device 100 includes at least a control component, which may be a host computer 110. The host computer may include software that can display a temperature rise curve in real time based on the temperature rise rate uploaded by the battery pack thermal runaway test system 200. The first cooling device 221 can be connected and communicated with the host computer 110. Figure 3 The first cooling device 221 can be disposed in the circumferential direction of the battery pack 300. Specifically, the first cooling device 221 can be disposed at any position in the direction of the axis around the battery pack 300. It can be understood that the first cooling device 221 is disposed around the outside of the battery pack 300 and is used to cool the outside of the battery pack 300.

[0126] For example, the temperature detection device includes a second temperature detector, which is located outside the battery pack 300 and is used to acquire a first temperature parameter of the battery pack 300. The first temperature threshold can be the minimum temperature value at which there is a potential risk of uncontrolled fire outside the battery pack, and is not limited thereto. The first cooling device 221 can be a fire extinguishing device outside the battery pack 300. The fire extinguishing device is an external device at the test location, extending from the wall to the outside, with the nozzle aimed at the test sample. The fire extinguishing device automatically identifies the flame and sprays extinguishing agent to ensure the safety of personnel and property.

[0127] Here, environmental parameters are used as factors affecting the activation of the cooling device, while the first external temperature parameter of the battery pack 300 is monitored. By combining environmental and temperature parameters, multiple protections are provided against the risk of fire runaway, thus more effectively controlling the risk of fire runaway of the battery pack 300.

[0128] In one embodiment, such as Figure 3 As shown, the target cooling device 220 also includes a second cooling device 222, which is disposed inside the battery pack 300. The second cooling device 222 is used to cool the inside of the battery pack 300. The second cooling device 222 is connected to the control device 100. The temperature of the battery pack 300 also includes a second temperature parameter. The control device 100 is also used to acquire the second temperature parameter of the battery pack 300. When the value of the second temperature parameter is greater than or equal to a preset second temperature threshold, the control device 100 determines that the second cooling device 222 inside the battery pack 300 is in an on state. The second temperature threshold is greater than the target temperature threshold. The control device 100 also acquires a first duration for which the second cooling device 222 is in an on state. When the first duration is greater than or equal to the preset first threshold, the control device 100 determines the environmental parameters.

[0129] For example, the second cooling device 222 can be communicatively connected to the host computer 110, in Figure 3 The image is not shown. The temperature detection device also includes a first temperature detector, which is disposed inside the battery pack 300 and is used to acquire a second temperature parameter of the battery pack 300. The second temperature threshold can be the minimum temperature value at which there is a potential risk of fire runaway inside the battery pack 300, and is not limited here. The second cooling device 222 can be a fire extinguishing device inside the battery pack 300, and is not limited here.

[0130] For example, the control device 100 also includes a hardware timer, which can be triggered based on a first cooling signal to accumulate the duration for which the second cooling device 222 is in the on state, thus obtaining a first duration. The first cooling signal can be a signal generated by the control device 100 when the value of a second temperature parameter is greater than or equal to a preset second temperature threshold.

[0131] Here, when the temperature meets the preset thermal runaway conditions, by monitoring the second temperature parameter inside the battery pack 300, determining whether to activate the second cooling device 222 based on the value of the second temperature parameter, and determining whether to acquire environmental parameters related to the battery pack 300 based on the duration the second cooling device 222 is in the activated state, it is possible to achieve a rapid response to the fire runaway risk inside the battery pack 300 in the early stages of the fire runaway risk. Furthermore, when the cooling device inside the battery pack 300 cannot effectively cool the battery pack 300, the environmental parameters are used as an influencing factor for activating the cooling device, providing multiple protections against the fire runaway risk and more effectively controlling the fire runaway risk of the battery pack 300.

[0132] In one embodiment, such as Figure 3 As shown, the target cooling device 220 also includes a third cooling device 223, which is disposed in the top peripheral space of the battery pack 300. The third cooling device 223 is used to spray and cool the battery pack 300; the third cooling device 223 is connected to the control device 100.

[0133] The control device 100 is also used to obtain a second duration during which the first cooling device 221 is in the on state; when the second duration is greater than or equal to a preset second threshold, the control device 223 is turned on so that the temperature of the battery pack 300 is less than or equal to the target temperature threshold.

[0134] For example, the third cooling device 223 can be connected and communicated with the host computer 110. Figure 3 (Not shown). A hardware timer is triggered by a second cooling signal to accumulate the duration for which the first cooling device 221 is in the on state, resulting in a second duration. The second cooling signal can be a signal generated by the control device 100 when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold.

[0135] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack 300 has been cooled to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device 221 is in the on state. If the external cooling device of the battery pack 300 cannot effectively cool the battery pack 300, the system controls the third cooling device 223 to be in the on state to spray and cool the battery pack 300, thus providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack 300.

[0136] In some embodiments, the temperature detection device further includes a third temperature detector, which is disposed outside the battery pack 300 and is used to obtain a third temperature parameter of the battery pack 300; if the third temperature parameter is greater than or equal to a third temperature threshold, the third fire extinguishing device is controlled to switch to the open state; in order to activate the third cooling device 223 when the temperature outside the battery pack 300 further increases, the third temperature threshold is greater than or equal to the first temperature threshold.

[0137] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack 300 has cooled to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device 221 is in the on state. If the external cooling device of the battery pack 300 cannot effectively cool the battery pack 300 or the fire is not completely controlled / has a tendency to spread, the system controls the third cooling device 223 to be in the on state to spray and cool the battery pack 300, providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack 300.

[0138] In one embodiment, such as Figure 3 As shown, the control device 100 includes a heating component 120 for controlling the heating power of the heating device 210, and the heating device 210 is connected to the heating component 120.

[0139] For example, the heating component 120 can be a heating instrument, which is not limited here. The heating component 120 can be connected and communicated with the host computer 110 to transmit the temperature rise rate of the heating device 210 to the host computer.

[0140] Here, after setting the temperature rise rate threshold, if the detected temperature rise rate is lower than the temperature rise rate threshold, the output power will be increased through the heating component 120, such as by increasing voltage and current. If the detected temperature rise rate is higher than the temperature rise rate threshold, the power will be reduced through the heating component 120. This adaptively maintains the predetermined temperature rise rate, thereby improving the accuracy of the thermal runaway test of the battery pack 300.

[0141] In one embodiment, such as Figure 4 As shown, the first heating device 211 is disposed at the first end of the battery cell 310 in the battery pack 300; the second heating device 212 is disposed at the second end of the battery cell 310 in the battery pack 300; the first end and the second end are the two opposite ends of the battery cell 310 in the battery pack 300.

[0142] For example, the battery cell 310 in the battery pack 300 can be a trigger cell, which is not limited here. The first heating device 211 can be a first heating element; the second heating device 212 can be a second heating element. The first heating element and the second heating element can be attached to both ends of the battery cell 310 in the battery pack 300. It can be understood that one end of the battery cell 310 in the battery pack 300 is arranged opposite to the other end.

[0143] Here, by setting heating devices at the corresponding ends of the battery cell 310 in the battery pack 300 to conduct thermal runaway testing, the two ends of the battery cell 310 in the battery pack 300 are heated simultaneously, which effectively improves the efficiency of battery thermal runaway testing.

[0144] In one embodiment, the battery pack thermal runaway test system 200 further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed at the first end of the battery cell 310 in the battery pack 300, and the second temperature sensor is disposed at the second end of the battery cell 310 in the battery pack 300.

[0145] The first temperature sensor is used to detect the first temperature value of the cell 310 in the battery pack 300;

[0146] The second temperature sensor is used to detect the second temperature value of the cell 310 in the battery pack 300.

[0147] Here, by setting temperature sensors at the corresponding ends of the cell 310, the temperature value of the cell 310 in the battery pack 300 is monitored, which effectively monitors whether thermal imbalance occurs at the two ends of the cell 310 in the battery pack 300 and improves the accuracy of thermal runaway testing.

[0148] In one embodiment, when the first temperature value is less than the second temperature value, the first heating power of the first heating device 211 is greater than the second heating power of the second heating device 212.

[0149] For example, if the first temperature value is less than or equal to the second temperature value, it indicates that the temperature of the first end of the cell 310 in the battery pack 300 is less than or equal to the temperature of the second end of the cell 310 in the battery pack 300, and the cell 310 in the battery pack 300 has a defect of uneven heating. Therefore, the first heating power of the first heating device 211 is controlled to be greater than or equal to the second heating power of the second heating device 212. By increasing the first heating power of the first heating device 211, the temperature of the first end of the cell 310 in the battery pack 300 gradually rises until it is consistent with the temperature of the second end of the cell 310 in the battery pack 300.

[0150] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell 310 in the battery pack 300 to be the same or different, the temperature at both ends of the battery cell 310 in the battery pack 300 is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0151] In one embodiment, when the first temperature value is greater than the second temperature value, the first heating power of the first heating device 211 is less than or equal to the second heating power of the second heating device 212.

[0152] For example, if the first temperature value is greater than the second temperature value, it indicates that the temperature of the first end of the battery cell 310 in the battery pack 300 is greater than the temperature of the second end of the battery cell 310 in the battery pack 300, and the battery cell 310 in the battery pack 300 has a defect of uneven heating. Therefore, the first heating power of the first heating device 211 is controlled to be less than the second heating power of the second heating device 212. By increasing the second heating power of the second heating device 212, the temperature of the second end of the battery cell 310 in the battery pack 300 gradually rises until it is consistent with the temperature of the first end of the battery cell 310 in the battery pack 300.

[0153] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell 310 in the battery pack 300 to be the same or different, the temperature at both ends of the battery cell 310 in the battery pack 300 is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0154] In one embodiment, the control device 100 further includes a voltage detection component for acquiring voltage parameters of the battery pack 300.

[0155] Here, by acquiring the voltage parameters of the battery pack 300 through the voltage detection component, it is possible to help determine whether the battery pack 300 meets the thermal runaway conditions, effectively reducing the delay error of battery thermal runaway testing.

[0156] The control method provided by the embodiments of the present invention will be described below.

[0157] In related technologies, most methods for testing the thermal runaway of battery packs involve manually adjusting instruments to heat the trigger cells. The main drawbacks and shortcomings of these methods are: First, limitations: manually adjusting the instruments requires personnel to constantly correct the output power of the instruments, which is labor-intensive; Second, insufficient accuracy: relying on visual identification of the temperature rise rate and manually adjusting the heating instruments will result in a large number of errors, which will prolong the thermal runaway time of the trigger cells and increase the risk.

[0158] Figure 4 A flowchart illustrating another control method provided in an embodiment of the present invention is shown below. Figure 5 As shown, the control method includes the following steps:

[0159] Step 401: Two heating elements are attached to the trigger cell inside the battery pack. The two heating elements are connected in parallel and extend out from inside the battery pack.

[0160] For example, the heating element can be attached to the trigger cell before thermal runaway detection of the battery pack.

[0161] Step 402: Place the battery pack or module on the test bench and connect the heating element harness into the instrument.

[0162] For example, a test bench can be built based on a battery pack or module, a test bench, and a heating element.

[0163] Step 403: The temperature of the heating element is transmitted to the heating instrument interface in real time. After setting the temperature rise rate threshold, if the temperature rise rate is detected to be lower than the temperature rise rate threshold, the output power will be increased, for example, by increasing voltage and current. If the temperature rise rate is detected to be higher than the temperature rise rate threshold, the power will be reduced. The system will continuously and adaptively maintain the predetermined temperature rise rate.

[0164] For example, the temperature of the heating element is automatically controlled by a heating instrument to maintain the temperature rise rate of the heating element at a set temperature rise rate threshold.

[0165] Step 404: The temperature rise rate is transmitted to the host computer, and the temperature rise curve is displayed in real time on the host computer software. After the thermal runaway judgment condition is triggered, the heating device is automatically controlled to stop heating.

[0166] For example, the host computer integrates data such as the temperature rise rate at each moment to obtain a temperature rise curve.

[0167] Step 405: The high-voltage line monitors the total voltage of the battery pack throughout the process to record voltage data.

[0168] For example, voltage data can help determine whether a battery pack meets the conditions for thermal runaway.

[0169] Step 406: The temperature rise curve is exported from the host computer, which can be used to analyze the comparison between heating power and battery pack reaction and evaluate the safety value of the battery pack.

[0170] For example, data analysis can be performed based on the temperature rise curve to assess the safety value of the battery pack, such as the thermal runaway threshold.

[0171] In this embodiment of the invention, when the temperature rise rate of the battery cell is detected to be greater than 3℃ / s, in order to improve safety and accuracy, the environmental parameters and a pre-trained prediction model are used to determine the state information of the environment in which the battery pack is located to detect whether the battery cell is abnormal. If abnormal, it is determined whether the battery cell temperature has reached the temperature threshold. If the temperature reaches the temperature threshold, the fire extinguishing device is activated to extinguish the fire. Automatic flame identification is assisted by a built-in sensor. After identifying the flame, gas or dry powder is automatically sprayed from inside to extinguish the fire. The fire extinguishing device is linked to an upper spray fire extinguishing device. The top of the battery pack is equipped with a spray fire extinguishing device for cooling, which further suppresses high temperature and reduces the danger to a lower level.

[0172] In some embodiments, the control device can automatically control the temperature rise rate of the cells in the battery pack, and reduce the heating power when the temperature rise rate is higher than a predetermined temperature rise rate threshold, and increase the heating power when the temperature rise rate is lower than the predetermined temperature rise rate threshold; the battery pack thermal runaway test system can determine the battery pack thermal runaway cutoff condition and automatically stop it; it can analyze the comparison between heating power and battery pack response to evaluate the battery pack safety value.

[0173] In some embodiments, the system can solve the problem of judgment error caused by manually controlling battery pack heating to trigger thermal runaway. In addition to controlling the temperature rise rate, the battery pack thermal runaway test system can also determine the thermal runaway cutoff condition of the battery pack and then automatically stop heating, which greatly reduces the workload of personnel and saves labor costs. The battery pack thermal runaway test system has higher long-term stability and greater accuracy. It is suitable for testing related to thermal runaway triggered by heating methods at the battery pack, cell, and even cluster level. It solves the error in the implementation of relevant domestic and overseas standards, and can accumulate data over a long period of time to analyze the comparison between heating power and battery pack response and evaluate the safety value of the battery pack.

[0174] To implement the method of the embodiments of the present invention, Figure 5 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention, such as... Figure 5 As shown, this application embodiment also provides an electronic device 50 that may include: a memory 501 for storing a computer program; and a processor 502 for executing the computer program to implement any of the methods described above. For example, the processor 502 may be used to: monitor the temperature of a battery pack; acquire environmental parameters related to the battery pack when the temperature meets preset thermal runaway conditions; determine the state information of the environment in which the battery pack is located based on the environmental parameters and a pre-trained prediction model; and, when the state information indicates that the environment in which the battery pack is located is in an abnormal state, control a target cooling device to be turned on based on the temperature of the battery pack, so that the temperature of the battery pack is less than or equal to a preset target temperature threshold. The processor 502 may also implement any of the steps in the methods described above, which will not be repeated here.

[0175] It should be noted that the electronic devices and control method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0176] Of course, in practical applications, such as Figure 5 As shown, the electronic device 50 may further include at least one network interface 503. Various components in the electronic device are coupled together via a bus system 504. It is understood that the bus system 504 is used to implement communication between these components. In addition to a data bus, the bus system 504 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in... ​Various buses are labeled as bus systems 504. The number of processors 502 can be at least one. Network interface 503 is used for wired or wireless communication between electronic devices and other devices. Memory 501 in this embodiment is used to store various types of data to support the operation of the electronic device. The methods disclosed in the above embodiments can be applied to processor 502, or implemented by processor 502. Processor 502 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by integrated logic circuits in the hardware of processor 502 or by instructions in software form. The processor 502 can be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 502 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. A general-purpose processor can be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of this application can be directly reflected in the combined execution of hardware and software modules in a microcontroller. The software module can reside in a storage medium located in memory 501. The processor 502 reads information from memory 501 and, in conjunction with its hardware, completes the steps of the aforementioned method. In an exemplary embodiment, the electronic device 50 can be implemented using one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to execute the aforementioned method.

[0177] Specifically, embodiments of this application provide a computer-readable storage medium storing a computer program thereon, such as a memory 501 storing the computer program, which can be executed by a processor 502 to complete the aforementioned method steps. The computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM.

[0178] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0179] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0180] Alternatively, if the integrated units of this invention are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0181] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A control method, characterized in that, This invention relates to a battery pack thermal runaway testing system. The system includes a heating device and a target cooling device. The target cooling device surrounds the battery pack. The heating device includes at least a first heating element and a second heating element connected in parallel. One end of the battery pack is connected to the first heating element, and the other end is connected to the second heating element. The first and second heating elements are used to heat the battery pack. The target cooling device is used to cool the battery pack; the method includes: Monitor the temperature of the battery pack; When the temperature meets the preset thermal runaway conditions, environmental parameters related to the battery pack are obtained; The state information of the environment in which the battery pack is located is determined based on the environmental parameters and the pre-trained prediction model; When the status information indicates that the environment in which the battery pack is located is in an abnormal state, the target cooling device is turned on based on the temperature of the battery pack, so that the temperature of the battery pack is less than or equal to a preset target temperature threshold.

2. The control method according to claim 1, characterized in that, The target cooling device includes at least a first cooling device for cooling the exterior of the battery pack; the temperature of the battery pack includes a first temperature parameter; controlling the target cooling device to be in an "on" state based on the temperature of the battery pack includes: Obtain the first temperature parameter of the battery pack; When the value of the first temperature parameter is greater than or equal to the preset first temperature threshold, the first cooling device is controlled to be turned on so that the temperature of the battery pack is less than or equal to the target temperature threshold; the first temperature threshold is greater than the target temperature threshold.

3. The control method according to claim 1, characterized in that, The target cooling device further includes a second cooling device for cooling the interior of the battery pack; the temperature of the battery pack also includes a second temperature parameter; acquiring environmental parameters related to the battery pack includes: Obtain the second temperature parameter of the battery pack; When the value of the second temperature parameter is greater than or equal to the preset second temperature threshold, the second cooling device in the battery pack is determined to be in the activated state; the second temperature threshold is greater than the target temperature threshold. The duration during which the second cooling device is in the on state is determined; When the first duration is greater than or equal to a preset first threshold, the environmental parameters are obtained.

4. The control method according to claim 2, characterized in that, The target cooling device further includes a third cooling device, which is used to spray and cool the battery pack; after controlling the first cooling device to be in the on state, the method further includes: The second duration during which the first cooling device is in the on state is obtained; When the second duration is greater than or equal to a preset second threshold, the third cooling device is controlled to be turned on so that the temperature of the battery pack is less than or equal to the target temperature threshold.

5. The control method according to claim 1, characterized in that, The method further includes: The system acquires historical environmental parameters related to the battery pack, as well as historical state information of the environment in which the battery pack is located corresponding to each of the historical environmental parameters; the historical environmental parameters include at least one of historical smoke concentration, historical gas composition, and historical gas concentration. The prediction model to be optimized is trained based on the historical environmental parameters and the historical state information to obtain the trained prediction model. When the trained prediction model converges, the trained prediction model is recorded and stored.

6. The control method according to any one of claims 1-5, characterized in that, The method further includes: Monitor a first temperature value at one end of the battery pack and a second temperature value at the other end of the battery pack; If the first temperature value is greater than the second temperature value, the first heating power of the first heating device is controlled to be less than the second heating power of the second heating device. Alternatively, if the first temperature value is less than or equal to the second temperature value, the first heating power is controlled to be greater than or equal to the second heating power.

7. The control method according to any one of claims 1-6, characterized in that, The method further includes: The rate parameter of temperature rise of the battery pack is determined based on the temperature of the battery pack; Determine whether the rate parameter satisfies the thermal runaway condition, and obtain the determination result; If the judgment result indicates that the rate parameter meets the thermal runaway condition, the first heating device and the second heating device are controlled to stop performing thermal runaway testing on the battery pack.

8. A control device, characterized in that, This invention relates to a battery pack thermal runaway testing system. The system includes a heating device and a target cooling device. The target cooling device surrounds the battery pack. The heating device includes at least a first heating element and a second heating element connected in parallel. One end of the battery pack is connected to the first heating element, and the other end is connected to the second heating element. The first and second heating elements are used to heat the battery pack. A control device is connected to both the heating device and the target cooling device. The control device is used to monitor the temperature of the battery pack; when the temperature meets the preset thermal runaway conditions, it acquires environmental parameters related to the battery pack; and controls the target cooling device to be turned on based on the environmental parameters and the temperature. The target cooling device is used to cool the battery pack so that the temperature of the battery pack is less than or equal to a preset target temperature threshold.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program configured to be executed by a processor to implement the control method of any one of claims 1 to 7.

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