Pressure testing method, apparatus, electronic device, and storage medium

Abstract

Embodiments of the present application disclose a pressure test method and device, electronic equipment and storage medium. The method is applied to the electronic equipment, and the electronic equipment is in communication connection with a pressure applying equipment. The pressure applying equipment includes a main driving device, proportional valves corresponding to a plurality of cell placement layers in a battery, and pressure sensors corresponding to the plurality of cell placement layers. The method includes: in a process in which the pressure applying equipment applies pressure to cells placed in the plurality of cell placement layers, determining a pressure update value corresponding to a target cell placement layer according to a pressure original value corresponding to the target cell placement layer and a gas pressure output value; and determining a pressure test state corresponding to the target cell placement layer according to the pressure update value corresponding to the target cell placement layer. By implementing the embodiments of the present application, the accuracy of testing the pressure corresponding to the cell placement layer can be improved in the process of applying pressure to the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a pressure testing method, apparatus, electronic device, and storage medium. Background Technology

[0002] In the battery manufacturing process, after the battery cells are wound or stacked, pressure needs to be applied to the cells to increase their physical strength. For example, this pressure can be achieved through hot pressing. After the cells are wound or stacked, they can pass through a hot pressing station, where heating and pressure are used to make the battery materials adhere more tightly, improving the subsequent chemical reaction between the battery materials and the electrolyte. Simultaneously, the hot pressing process can also tightly bond the separator to the positive and negative electrode materials, increasing the battery's physical strength and reducing its thickness.

[0003] Currently, in the battery hot-pressing process, after a period of hot-pressing production, the pressure sensors in the hot press may display inaccurate pressure values. When the pressure sensor's accuracy is compromised, it severely impacts the hot-pressing effect on the production line and can even affect the performance of the produced lithium batteries. To avoid this, the pressure sensors are currently recalibrated periodically by personnel. However, current manual calibration methods cannot accurately test the pressure applied to the battery cells during the pressure application process. Summary of the Invention

[0004] This application discloses a pressure testing method, apparatus, electronic device, and storage medium, which can improve the accuracy of testing the pressure corresponding to the battery cell during the process of applying pressure to the battery cell.

[0005] This application discloses a pressure testing method applied to an electronic device, wherein the electronic device is communicatively connected to a pressure application device. The pressure application device includes a main drive unit, proportional valves corresponding to multiple cell placement layers, and pressure sensors corresponding to the multiple cell placement layers. Each proportional valve is connected to a sub-drive unit. During the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers, the main drive unit applies downward pressure to the multiple cell placement layers, and the proportional valves apply upward supporting force to the corresponding cell placement layers through the sub-drive units. The method includes:

[0006] During the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers, the raw pressure values ​​collected by the pressure sensors corresponding to the multiple cell placement layers and the air pressure output values ​​of the proportional valves corresponding to the multiple cell placement layers are obtained.

[0007] Based on the original pressure value and the air pressure output value corresponding to the target cell placement layer, the updated pressure value corresponding to the target cell placement layer is determined; the target cell placement layer can be any cell placement layer.

[0008] Based on the pressure update value corresponding to the target cell placement layer, the pressure test status corresponding to the target cell placement layer is determined.

[0009] As an optional implementation, determining the pressure test status corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer includes:

[0010] The pressure test status of the target cell placement layer is determined based on the pressure update value corresponding to the target cell placement layer and the pressure update value corresponding to the cell placement layer above the target cell placement layer.

[0011] As an optional implementation, the target cell placement layer is any cell placement layer other than the first cell placement layer; determining the pressure test state corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer and the pressure update value corresponding to the cell placement layer above the target cell placement layer includes:

[0012] Determine whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure sum value corresponding to the previous cell placement layer; the pressure sum value corresponding to the previous cell placement layer is the sum of the pressure update value corresponding to the previous cell placement layer and a preset value;

[0013] If so, then the pressure test status corresponding to the target cell placement layer is determined to be normal.

[0014] If not, then the pressure test status corresponding to the target cell placement layer is determined to be an abnormal state.

[0015] As an optional implementation, before determining whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, the method further includes:

[0016] Determine the number of times pressure was applied in the past;

[0017] If the number of force applications exceeds a threshold, after determining whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, the method further includes:

[0018] If the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, then the original pressure values ​​corresponding to the previous cell placement layer in the multiple historical applied pressures and the parameters of the main drive device are input into the pressure test model. The pressure test model determines the predicted pressure values ​​corresponding to the target cell placement layer in the multiple historical applied pressures based on the original pressure values ​​and the parameters of the main drive device, and determines the pressure test status of the target cell placement layer based on the predicted pressure values ​​corresponding to the target cell placement layer in the multiple historical applied pressures.

[0019] As an optional implementation, determining the pressure test status of the target cell placement layer based on the predicted pressure values ​​corresponding to the target cell placement layer in multiple historical applied pressures includes:

[0020] Calculate the pressure difference between the predicted pressure value and the original pressure value corresponding to the target cell placement layer in multiple historical applied pressures;

[0021] Identify abnormal historical applied pressures in which the pressure difference is greater than a pressure threshold among multiple historical applied pressures;

[0022] If the proportion of the number of times the abnormal historical pressure was applied to the total number of times the historical pressure was applied is greater than the proportion threshold, then the pressure test state corresponding to the target cell placement layer is determined to be an abnormal state.

[0023] If the ratio of the number of abnormal historical pressure applications to the total number of historical pressure applications is less than a ratio threshold, then the pressure test status corresponding to the target cell placement layer is determined to be a normal state.

[0024] As an optional implementation, determining the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the gas pressure output value of the target cell placement layer includes:

[0025] Based on the cylinder radius of the proportional valve corresponding to the target battery cell placement layer and the corresponding air pressure output value, determine the pressure correction value corresponding to the target battery cell placement layer;

[0026] The original pressure value and the corresponding pressure correction value corresponding to the target cell placement layer are added together to obtain the updated pressure value corresponding to the target cell placement layer.

[0027] As an optional implementation, before acquiring the raw pressure values ​​collected by the pressure sensors corresponding to the plurality of battery cell placement layers, and the air pressure output values ​​of the proportional valves corresponding to the plurality of battery cell placement layers, the method further includes:

[0028] Obtain multiple preset pressure values ​​for the proportional valve corresponding to the target cell placement layer;

[0029] The proportional valve corresponding to the target cell placement layer is controlled to output air pressure according to each of the preset pressure values, and the pressure overshoot corresponding to the target cell placement layer is calculated when the proportional valve outputs air pressure at each of the preset pressure values; the pressure overshoot is determined based on the difference between the maximum original pressure value collected by the pressure sensor corresponding to the target cell placement layer and the pressure standard value.

[0030] Based on the correspondence between the preset pressure value and the pressure overshoot corresponding to the target cell placement layer, a fitting curve between the preset pressure value and the pressure overshoot corresponding to the target cell placement layer is obtained.

[0031] Based on the fitted curve, determine the preset pressure value corresponding to when the pressure overshoot is 0;

[0032] The preset pressure value corresponding to the pressure overshoot being 0 is used as the initial value of the air pressure output value of the proportional valve corresponding to the target cell placement layer.

[0033] As an optional implementation, the method further includes:

[0034] Linear fitting is performed on the air pressure output value and air pressure feedback value of the target proportional valve to obtain a first fitting curve corresponding to the air pressure output value of the target proportional valve and a second fitting curve corresponding to the air pressure feedback value of the target proportional valve; the air pressure output value is the desired pressure value output by the electronic device to the target proportional valve for controlling the target proportional valve, and the air pressure feedback value is the actual pressure value output by the target proportional valve.

[0035] Calculate the parameter difference between the first fitted curve and the second fitted curve with the same curve parameters. If the parameter difference is greater than the difference threshold, adjust the air pressure output value of the target proportional valve.

[0036] This application discloses a pressure testing device applied to an electronic device, which is communicatively connected to a pressure application device. The pressure application device includes a main drive device, proportional valves corresponding to multiple battery cell placement layers, and pressure sensors corresponding to each of the multiple battery cell placement layers. Each proportional valve is connected to a sub-drive device. During the process of the pressure application device applying pressure to the battery cells placed in the multiple battery cell placement layers, the main drive device applies downward pressure to the multiple battery cell placement layers, and the proportional valves apply upward supporting force to the corresponding battery cell placement layers through the sub-drive devices. The device includes:

[0037] The data acquisition module is used to acquire the raw pressure values ​​collected by the pressure sensors corresponding to the multiple battery cell placement layers and the air pressure output values ​​of the proportional valves corresponding to the multiple battery cell placement layers during the process of the pressure application device applying pressure to the battery cells placed in the multiple battery cell placement layers respectively.

[0038] The pressure determination module is used to determine the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the air pressure output value; the target cell placement layer can be any cell placement layer.

[0039] The status determination module is used to determine the pressure test status corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer.

[0040] This application discloses an electronic device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor implements any of the stress testing methods disclosed in this application.

[0041] This application discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute any of the stress testing methods disclosed in this application.

[0042] Compared with related technologies, the embodiments of this application have the following beneficial effects:

[0043] During the process of applying pressure to the cells placed in multiple cell placement layers by the pressure application device, the raw pressure values ​​collected by the pressure sensors corresponding to each of the multiple cell placement layers, as well as the air pressure output values ​​of the proportional valves corresponding to each of the multiple cell placement layers, are acquired. Based on the raw pressure value and air pressure output value corresponding to the target cell placement layer, the updated pressure value corresponding to the target cell placement layer is determined. The target cell placement layer can be any cell placement layer. Based on the updated pressure value corresponding to the target cell placement layer, the pressure test status corresponding to the target cell placement layer is determined.

[0044] This application embodiment determines the updated pressure value corresponding to the target cell placement layer based on the original pressure value collected by the pressure sensor corresponding to the target cell placement layer and the air pressure output value of the proportional valve. The pressure test status corresponding to the target cell placement layer is automatically determined based on the updated pressure value, avoiding the problem of low accuracy caused by manual testing. This improves the accuracy of pressure testing corresponding to the cell during the process of applying pressure to the cell. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram illustrating an application scenario of a stress testing method disclosed in an embodiment of this application;

[0047] Figure 2 This is a schematic flowchart of a stress testing method disclosed in an embodiment of this application;

[0048] Figure 3 This is a flowchart illustrating another stress testing method disclosed in an embodiment of this application;

[0049] Figure 4 This is a flowchart illustrating another stress testing method disclosed in an embodiment of this application;

[0050] Figure 5 This is a schematic diagram of the structure of a pressure testing device disclosed in an embodiment of this application;

[0051] Figure 6 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0054] This application discloses a pressure testing method, apparatus, electronic device, and storage medium, which can improve the accuracy of testing the pressure corresponding to the battery cell during the application of pressure. These will be described in detail below.

[0055] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of a stress testing method disclosed in an embodiment of this application. For example... Figure 1 As shown, the stress testing method disclosed in this application is applied to an electronic device 10. The electronic device 10 may be a personal computer, a laptop, a tablet computer, a smartphone, a wearable device, or other electronic devices, but is not limited to these.

[0056] The pressure application device is used to apply pressure to the battery cells placed in the multiple battery cell placement layers 60 respectively. The pressure application device may include, but is not limited to, hot pressing equipment, cold pressing equipment, hydraulic processing equipment, etc.

[0057] The cell placement layer 60 can be a structure for placing cell cells. Optionally, the cell placement layer 60 is made of insulating material to prevent accidents such as short circuits between cell cells. One cell placement layer 60 can be used to place one cell. Figure 1 The number of cell placement layers 60 is four.

[0058] The battery cell placed in the battery cell placement layer 60 is the energy storage unit of the battery, which can convert chemical energy into electrical energy. The battery cell may include a positive electrode, a negative electrode, and a separator. The pressure application device applies pressure to the battery cell placed in the battery cell placement layer 60, which can make the separator, positive electrode, negative electrode and other components in the battery cell tightly bonded together, increasing the physical strength of the battery and reducing the thickness of the battery.

[0059] The pressure application device may include a main drive unit 20, proportional valves 30 corresponding to multiple cell placement layers 60 respectively, and pressure sensors 40 corresponding to multiple cell placement layers respectively; each proportional valve 30 is connected to a sub-drive unit 50 respectively.

[0060] Optionally, the main drive device 20 may include, but is not limited to, a motor, a pneumatic drive device, a hydraulic drive device, etc., without specific limitations; further, the motor may include, but is not limited to, a servo main drive device, a stepper main drive device, a torque main drive device, etc.

[0061] The sub-drive device 50 may include, but is not limited to, cylinders, hydraulic cylinders, linear electric actuators, etc., and the specific type is not limited.

[0062] like Figure 1As shown, during the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers 60, the main drive device 20 applies downward pressure to the multiple cell placement layers 60, and the proportional valve 30 applies upward support force to the corresponding cell placement layer 60 through the sub-drive device 50. Because the main drive device 20 applies downward pressure to the multiple cell placement layers 60 from the top, except for the topmost cell placement layer, the other cell placement layers are affected by the gravity of the layer above. Therefore, the cell placement layer 60 needs an upward support force to ensure that the pressure from the main drive device on each cell placement layer 60 is consistent. Therefore, the proportional valve 30 is connected to the sub-drive device 50 to provide an upward support force to the cell placement layer 60 to counteract the influence of factors such as the gravity of the layer above.

[0063] The electronic device 10 can communicate with the main drive unit 20, pressure sensor 40, and proportional valve 30 in the pressure application device to obtain parameters of the main drive unit 20, raw pressure values ​​collected by the pressure sensor 40, and air pressure output and feedback values ​​of the proportional valve 30. Optionally, the sampling period of the main drive unit 20, pressure sensor 40, and proportional valve 30 in the pressure application device can be 50 milliseconds, and the specific period is not limited.

[0064] Optionally, the proportional valve 30 can be a one-way proportional valve, which can be used to balance the downward pressure applied by the main drive to multiple cell placement layers.

[0065] Please see Figure 2 , Figure 2 This is a flowchart illustrating a stress testing method disclosed in an embodiment of this application. Wherein, Figure 2 The described pressure testing method is applied to an electronic device, which is communicatively connected to a pressure application device. The pressure application device includes a main drive unit, proportional valves corresponding to multiple cell placement layers, and pressure sensors corresponding to multiple cell placement layers. Each proportional valve is connected to a sub-drive unit. During the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers, the main drive unit is used to apply downward pressure to the multiple cell placement layers, and the proportional valves are used to apply upward supporting force to the corresponding cell placement layers through the sub-drive units.

[0066] like Figure 2 As shown, the stress testing method may include the following steps:

[0067] 201. During the process of applying pressure to the cells placed in multiple cell placement layers by the pressure application device, the raw pressure values ​​collected by the pressure sensors corresponding to the multiple cell placement layers and the air pressure output values ​​of the proportional valves corresponding to the multiple cell placement layers are obtained.

[0068] Among them, the original pressure value can be the original data directly collected by the pressure sensor corresponding to the cell placement layer;

[0069] The pneumatic pressure output value of a proportional valve can be the desired pressure value output by the electronic device to control the proportional valve; the pneumatic pressure feedback value of the proportional valve can be the actual pressure value output by the proportional valve. Therefore, the pneumatic pressure output value and the pneumatic pressure feedback value of the proportional valve are not necessarily equal, and the electronic device can adjust the pneumatic pressure output value based on the pneumatic pressure feedback value.

[0070] 202. Determine the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the air pressure output value.

[0071] The target cell placement layer can be any cell placement layer.

[0072] It should be noted that, since the target cell placement layer is subjected to both downward pressure from the main drive unit and upward support from the proportional valve, the pressure value corresponding to the target cell placement layer can be reconstructed based on the original pressure value and the air pressure output value. This reconstructed pressure value accurately reflects the pressure of the target cell placement layer under various forces. Therefore, by using this reconstructed pressure value, the electronic device can determine the pressure test state of the target cell placement layer, thus improving the accuracy of the pressure test state determination.

[0073] In some embodiments, the electronic device determines the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the air pressure output value corresponding to the target cell placement layer, including:

[0074] Based on the cylinder radius of the proportional valve corresponding to the target cell placement layer and the corresponding air pressure output value, determine the pressure correction value corresponding to the target cell placement layer; add the original pressure value corresponding to the target cell placement layer and the corresponding pressure correction value to obtain the updated pressure value corresponding to the target cell placement layer.

[0075] The cylinder radius of the proportional valve is the radius of the internal cylindrical cavity of the sub-drive device connected to the proportional valve, which can also be called the inner diameter of the sub-drive device.

[0076] Furthermore, as an optional implementation, the electronic device can multiply the square of the cylinder radius of the proportional valve corresponding to the target cell placement layer and the corresponding air pressure output value to determine the pressure correction value corresponding to the target cell placement layer.

[0077] 203. Determine the pressure test status corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer.

[0078] In some embodiments, the electronic device determines the pressure test state corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer, which may include:

[0079] The pressure test status of the target cell placement layer is determined based on the pressure update value corresponding to the target cell placement layer and the pressure update value corresponding to the cell placement layer above the target cell placement layer.

[0080] Optionally, the electronic device can calculate the pressure update value corresponding to the target cell placement layer and the difference between the pressure update value corresponding to the cell placement layer above the target cell placement layer. When the difference is determined to be greater than the difference threshold, the pressure test status corresponding to the target cell placement layer can be determined to be an abnormal state; when the difference is determined to be less than the difference threshold, the pressure test status corresponding to the target cell placement layer can be determined to be a normal state.

[0081] This application embodiment determines the updated pressure value corresponding to the target battery cell placement layer based on the original pressure value collected by the pressure sensor corresponding to the target battery cell placement layer and the air pressure output value of the proportional valve. This automatically determines the pressure test status corresponding to the target battery cell placement layer based on the updated pressure value, avoiding the problem of low accuracy caused by manual testing. It can improve the accuracy of pressure testing corresponding to the battery cell during the process of applying pressure to the battery cell. At the same time, compared with the manual testing scheme, this application embodiment can improve the efficiency of pressure testing and save human resources.

[0082] Please refer to further information. Figure 3 , Figure 3 This is a schematic flowchart of another stress testing method disclosed in an embodiment of this application. Figure 3 The described pressure testing method is applied to an electronic device, which is communicatively connected to a pressure application device. The pressure application device includes a main drive unit, proportional valves corresponding to multiple cell placement layers, and pressure sensors corresponding to multiple cell placement layers. Each proportional valve is connected to a sub-drive unit. During the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers, the main drive unit is used to apply downward pressure to the multiple cell placement layers, and the proportional valves are used to apply upward supporting force to the corresponding cell placement layers through the sub-drive units.

[0083] like Figure 3 As shown, the stress testing method may include the following steps:

[0084] 301. During the process of applying pressure to the cells placed in multiple cell placement layers by the pressure application device, the raw pressure values ​​collected by the pressure sensors corresponding to the multiple cell placement layers and the air pressure output values ​​of the proportional valves corresponding to the multiple cell placement layers are obtained.

[0085] 302. Determine the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the air pressure output value.

[0086] The target cell placement layer can be any cell placement layer.

[0087] In some embodiments, the electronic device can multiply the square of the cylinder radius of the proportional valve corresponding to the target battery cell placement layer, the corresponding air pressure output value, and the proportional factor to determine the pressure correction value corresponding to the target battery cell placement layer, as shown in the following formula:

[0088]

[0089] Where F2 is the updated pressure value, F1 is the original pressure value, and P N R is the air pressure output value. N This represents the cylinder radius corresponding to the proportional valve.

[0090] 303. Determine whether the number of times pressure has been applied in the past is greater than the number threshold. If the number of times pressure has been applied is less than the number threshold, proceed to step 304; if the number of times pressure has been applied is greater than the number threshold, proceed to step 307.

[0091] Since pressure needs to be applied to multiple batteries during the production process, the number of times pressure has been applied in the past can be equal to the number of batteries that have been pressured.

[0092] When the number of force applications is less than the threshold, the amount of accumulated data is small, so machine learning models are not suitable for predicting the stress test status because the results obtained by machine learning models may overfit when the amount of data is small. Therefore, it is necessary to determine whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer in order to determine the stress test status of the target cell placement layer.

[0093] When the number of stress applications exceeds the threshold, the accumulated data is sufficient, so a machine learning-based stress test model can be used to determine the stress test status of the target cell placement layer. This method can significantly improve the accuracy of stress testing.

[0094] 304. Determine whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer. If yes, proceed to step 305; otherwise, proceed to step 306.

[0095] The target cell placement layer is any cell placement layer other than the first cell placement layer. The pressure and value corresponding to the previous cell placement layer are the sum of the updated pressure value and the preset value of the previous cell placement layer.

[0096] For example, the preset value can be equal to 50 kilograms. Therefore, to determine whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, the following judgment formula can be used:

[0097] F 下 ≥F 上 +50kg; (2)

[0098] Among them, F 下 It is the target cell placement layer, which is any cell placement layer other than the first cell placement layer, F 上 This is the cell placement layer above the target cell placement layer.

[0099] 305. Determine that the pressure test status corresponding to the target cell placement layer is normal.

[0100] 306. Determine that the pressure test status corresponding to the target cell placement layer is an abnormal state.

[0101] Because the target cell placement layer is subjected to external forces such as the gravity of the previous cell placement layer, the pressure update value corresponding to the target cell placement layer should be greater than or equal to the pressure and value corresponding to the previous cell placement layer. If this judgment condition is not met, the pressure test state corresponding to the target cell placement layer can be judged as an abnormal state.

[0102] 307. Determine whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer. If yes, proceed to step 308; otherwise, proceed to step 309.

[0103] If the pressure update value corresponding to the target cell placement layer is less than the pressure and value corresponding to the previous cell placement layer, the pressure test status corresponding to the target cell placement layer can be directly judged as an abnormal state.

[0104] If the updated pressure value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, the pressure test status can be further confirmed based on the pressure test model. Therefore, when the number of force applications exceeds the threshold, due to the large amount of accumulated data, a machine learning-based pressure test model can be used to determine the pressure test status of the target cell placement layer a second time. This method can significantly improve the accuracy of pressure testing.

[0105] This application embodiment can monitor the subsequent pressure application process through a pressure test model, determine whether there is a problem with the accuracy of the pressure sensor, or determine whether there is a problem with the pressure corresponding to the cell placement layer, thereby improving the accuracy of the pressure test; and, based on the data accumulation, it automatically starts a machine learning-based pressure test for model training and anomaly judgment, further improving the accuracy and intelligence of the pressure test.

[0106] 308. Input the original pressure values ​​of the cell placement layer above the target cell placement layer in multiple historical pressure applications and the parameters of the main drive device into the pressure test model. Based on the original pressure values ​​and the parameters of the main drive device in multiple historical pressure applications, the pressure test model determines the predicted pressure values ​​of the target cell placement layer in multiple historical pressure applications. Based on the predicted pressure values ​​of the target cell placement layer in multiple historical pressure applications, the pressure test status of the target cell placement layer is determined.

[0107] The pressure test model can be a machine learning model, and there are no specific limitations. The parameters of the main drive unit can be its position, speed, torque, etc. The pressure prediction value is the result output by the pressure test model based on the original pressure values ​​corresponding to multiple historical pressure applications and the parameters of the main drive unit. The pressure prediction value can be used as a benchmark to determine whether the original pressure value is accurate.

[0108] In some embodiments, the electronic device determines the pressure test status of the target cell placement layer based on the predicted pressure values ​​corresponding to multiple historical applied pressures, which may include:

[0109] Calculate the pressure difference between the predicted pressure value and the original pressure value for the target cell placement layer in multiple historical pressure applications; identify abnormal historical pressures where the pressure difference is greater than a pressure threshold; if the proportion of abnormal historical pressures to the total number of historical pressure applications is greater than a proportion threshold, the pressure test status corresponding to the target cell placement layer is determined to be abnormal; if the proportion of abnormal historical pressures to the total number of historical pressure applications is less than a proportion threshold, the pressure test status corresponding to the target cell placement layer is determined to be normal.

[0110] For example, the pressure threshold can be equal to 10% of the predicted pressure value, the total number of historical pressure applications can be 20, and the proportion threshold can be 10%, without any specific limitation; for example, if the predicted pressure value is 50 kg, then the pressure threshold can be 5; if the number of abnormal historical pressure applications is 5, then the ratio of the number of abnormal historical pressure applications to the total number of historical pressure applications is equal to 25%, which is greater than the proportion threshold. Therefore, the pressure test state corresponding to the target cell placement layer can be determined to be an abnormal state.

[0111] 309. Determine that the pressure test status corresponding to the target cell placement layer is an abnormal state.

[0112] Furthermore, the electronic device can determine the accuracy of the pressure sensor based on the pressure test status corresponding to the target cell placement layer. If the pressure test status corresponding to the target cell placement layer is abnormal, it indicates that the accuracy of the pressure sensor is problematic; if the pressure test status corresponding to the target cell placement layer is normal, it indicates that the accuracy of the pressure sensor is not problematic.

[0113] In this embodiment, when the number of applied forces is less than a threshold, it determines whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, thereby determining the pressure test status of the target cell placement layer. When the number of applied forces is greater than the threshold, a pressure test model based on machine learning is used to accurately determine the pressure test status of the target cell placement layer, which can improve the accuracy of pressure testing of the cell during the application of pressure. Compared with manual pressure testing methods, this greatly improves the efficiency of pressure testing.

[0114] Please refer to further information. Figure 4 , Figure 4 This is a schematic flowchart of another stress testing method disclosed in an embodiment of this application. Figure 4 The described pressure testing method is applied to an electronic device, which is communicatively connected to a pressure application device. The pressure application device includes a main drive unit, proportional valves corresponding to multiple cell placement layers, and pressure sensors corresponding to multiple cell placement layers. Each proportional valve is connected to a sub-drive unit. During the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers, the main drive unit is used to apply downward pressure to the multiple cell placement layers, and the proportional valves are used to apply upward supporting force to the corresponding cell placement layers through the sub-drive units.

[0115] like Figure 4 As shown, the stress testing method may include the following steps:

[0116] 401. During the process of applying pressure to the cells placed in multiple cell placement layers by the pressure application device, multiple preset pressure values ​​of the proportional valve corresponding to the target cell placement layer are obtained.

[0117] The pressure preset value can be a value set manually.

[0118] 402. Control the proportional valve corresponding to the target cell placement layer to output air pressure according to each preset pressure value, and calculate the pressure overshoot corresponding to the target cell placement layer when the proportional valve outputs air pressure at each preset pressure value.

[0119] The pressure overshoot is determined based on the difference between the maximum raw pressure value collected by the pressure sensor corresponding to the target cell placement layer and the pressure standard value.

[0120] It should be noted that, during the pressure application process, the main drive device applies downward pressure to multiple cell placement layers, and the pressure on the target cell placement layer will actually fluctuate. Therefore, the maximum raw pressure value collected by the pressure sensor corresponding to the target cell placement layer can be the maximum value among the multiple fluctuating raw pressure values ​​collected by the pressure sensor.

[0121] The pressure standard value is determined according to the battery manufacturing process standard, and can be a standard parameter that can be directly obtained from electronic equipment.

[0122] 403. Based on the correspondence between the preset pressure value and the pressure overshoot corresponding to the target cell placement layer, obtain the fitting curve between the preset pressure value and the pressure overshoot corresponding to the target cell placement layer.

[0123] Optionally, a fitted curve can be obtained through linear fitting, which may include, but is not limited to, least squares method, gradient descent method, polynomial fitting method, etc.

[0124] 404. Based on the fitted curve, determine the preset pressure value corresponding to a pressure overshoot of 0.

[0125] A pressure overshoot of 0 indicates the highest pressure application efficiency. The proportional valve uses the preset pressure value corresponding to a pressure overshoot of 0 as the initial air pressure value, which can effectively improve the pressure application efficiency.

[0126] 405. Use the preset pressure value corresponding to the pressure overshoot of 0 as the initial value of the air pressure output value of the proportional valve corresponding to the target cell placement layer.

[0127] It should be noted that, during the pressure application process, the main drive device applies downward pressure to multiple cell placement layers, and the pressure on the target cell placement layer will actually fluctuate. Therefore, the air pressure output value of the proportional valve must also change accordingly to ensure that the pressure on each cell placement layer is consistent.

[0128] Therefore, the initial value of the air pressure output can be used only as the air pressure output value of the proportional valve in the initial stage of the pressure application process. The air pressure output value of the proportional valve in subsequent stages of the pressure application process will be automatically adjusted based on this initial value. Thus, the proportional valve can automatically adjust the air pressure output value based on this initial value during the pressure application process.

[0129] The air pressure output value of the proportional valve corresponding to the target cell placement layer is determined based on the initial air pressure value. That is, the air pressure output value of the proportional valve corresponding to the target cell placement layer in the initial stage of the pressure application process. The air pressure output value of the proportional valve in the subsequent stages of the pressure application process will fluctuate based on the initial air pressure output value.

[0130] In current technologies, the initial air pressure value of proportional valves is set based on the experience of on-site personnel, resulting in significant pressure overshoot during pressure application and affecting the working efficiency of the pressure application equipment. Therefore, executing steps 401-405 can provide a relatively reasonable initial air pressure output value for the proportional valve, saving on-site personnel's debugging time and reducing overshoot during pressure application.

[0131] 406. Obtain the raw pressure values ​​collected by the pressure sensors corresponding to the multiple battery cell placement layers, and the air pressure output values ​​of the proportional valves corresponding to the multiple battery cell placement layers.

[0132] In some embodiments, the electronic device may also perform the following steps:

[0133] Linear fitting is performed on the pneumatic output value and pneumatic feedback value of the target proportional valve to obtain the first fitting curve corresponding to the pneumatic output value of the target proportional valve and the second fitting curve corresponding to the pneumatic feedback value of the target proportional valve. The pneumatic output value is the expected pressure value output by the electronic device to the target proportional valve for controlling the target proportional valve, and the pneumatic feedback value is the actual pressure value output by the target proportional valve. The parameter difference between the first fitting curve and the second fitting curve with the same curve parameters is calculated. If the parameter difference is greater than the difference threshold, the pneumatic output value of the target proportional valve is adjusted.

[0134] Specifically, linear fitting methods may include, but are not limited to, least squares, gradient descent, and polynomial fitting. Optionally, the pressure feedback value and pressure output value of the target proportional valve can be analog quantities. To determine if the proportional valve calibration is abnormal, the curve parameters of the first fitted curve corresponding to the fitted pressure output value and the curve parameters of the second fitted curve corresponding to the pressure feedback value need to be compared. Optionally, the curve parameters may include the curve intercept, slope, polynomial coefficients, exponential function parameters, and relative error, etc. For example, when comparing the intercepts, if the intercept of the first fitted curve is K1 and the intercept of the second fitted curve is K2, the parameter difference between K1 and K2 is compared. If the parameter difference is greater than the difference threshold, the proportional valve calibration is determined to be abnormal, and the pressure output value of the target proportional valve can be adjusted. Alternatively, the pressure feedback value can be calibrated based on the curve parameters of the first fitted curve corresponding to the pressure output value. If the parameter difference is less than the difference threshold, the proportional valve calibration is determined to be normal.

[0135] This application embodiment can effectively identify whether the proportional valve is calibrated normally by fitting the air pressure output value and air pressure feedback value of the proportional valve, thus solving the problem that manual calibration of proportional valves cannot identify whether the calibration is abnormal.

[0136] 407. Determine the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the air pressure output value.

[0137] The target cell placement layer can be any cell placement layer.

[0138] 408. Determine the pressure test status corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer.

[0139] Optionally, users can restart the training of the pressure test model according to the on-site conditions, and integrate the multi-functional modules for sensor abnormal calibration, proportional valve calibration abnormal identification, and overshoot reduction in combination with the on-site production conditions.

[0140] This application embodiment accurately determines the initial value of the proportional valve's air pressure output by fitting a preset pressure value and pressure overshoot. This allows the proportional valve to automatically adjust the air pressure output value based on this initial value during pressure application, avoiding the problems of excessive pressure overshoot and reduced pressure efficiency caused by relying entirely on manual experience to set the initial air pressure value of the proportional valve in the past. At the same time, compared with the manual setting method, this application embodiment can improve the efficiency and accuracy of testing the pressure corresponding to the battery cell, saving human resources.

[0141] Please see Figure 5 , Figure 5This is a schematic diagram of a pressure testing device disclosed in an embodiment of this application. The device can be applied to electronic devices such as personal computers, laptops, tablets, smartphones, and wearable devices, and is not specifically limited thereto. The electronic device is communicatively connected to a pressure application device; the pressure application device includes a main drive unit, proportional valves corresponding to multiple cell placement layers, and pressure sensors corresponding to each of the multiple cell placement layers. Each proportional valve is connected to a sub-drive unit. During the process of the pressure application device applying pressure to the cells placed in the multiple cell placement layers, the main drive unit applies downward pressure to the multiple cell placement layers, and the proportional valves apply upward supporting force to the corresponding cell placement layers through the sub-drive units. Figure 5 As shown, the pressure testing device 500 may include: a data acquisition module 510, a pressure determination module 520, and a status determination module 530.

[0142] The data acquisition module 510 is used to acquire the raw pressure values ​​collected by the pressure sensors corresponding to the multiple battery cell placement layers and the air pressure output values ​​of the proportional valves corresponding to the multiple battery cell placement layers during the process of the pressure application device applying pressure to the battery cells placed in the multiple battery cell placement layers respectively.

[0143] The pressure determination module 520 is used to determine the updated pressure value corresponding to the target cell placement layer based on the original pressure value and the air pressure output value; the target cell placement layer can be any cell placement layer.

[0144] The status determination module 530 is used to determine the pressure test status of the target cell placement layer based on the pressure update value corresponding to the target cell placement layer.

[0145] In one embodiment, the state determination module 530 is further configured to determine the pressure test state corresponding to the target cell placement layer based on the pressure update value corresponding to the target cell placement layer and the pressure update value corresponding to the cell placement layer above the target cell placement layer.

[0146] In one embodiment, the target cell placement layer is any cell placement layer other than the first cell placement layer; the state determination module 530 is further configured to determine whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer; the pressure and value corresponding to the previous cell placement layer is the sum of the pressure update value corresponding to the previous cell placement layer and a preset value; if yes, the pressure test state corresponding to the target cell placement layer is determined to be normal; if no, the pressure test state corresponding to the target cell placement layer is determined to be abnormal.

[0147] In one embodiment, the pressure testing device 500 further includes a count module;

[0148] The frequency statistics module is used to determine the number of times pressure has been applied in the past before the status determination module 530 determines whether the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer.

[0149] The state determination module 530 is further configured to, if the pressure update value corresponding to the target cell placement layer is greater than or equal to the pressure and value corresponding to the previous cell placement layer, input the original pressure values ​​corresponding to the previous cell placement layer in multiple historical pressure applications and the parameters of the main drive device into the pressure test model. The pressure test model determines the predicted pressure values ​​corresponding to the target cell placement layer in multiple historical pressure applications based on the original pressure values ​​corresponding to the previous cell placement layer in multiple historical pressure applications and the parameters of the main drive device, and determines the pressure test state of the target cell placement layer based on the predicted pressure values ​​corresponding to the target cell placement layer in multiple historical pressure applications.

[0150] The state determination module 530 is also used to calculate the pressure difference between the predicted pressure value and the original pressure value corresponding to the target cell placement layer in multiple historical pressure applications; to determine abnormal historical pressures in multiple historical pressure applications where the pressure difference is greater than a pressure threshold; if the proportion of the number of abnormal historical pressure applications to the total number of historical pressure applications is greater than a proportional threshold, then the pressure test state corresponding to the target cell placement layer is determined to be an abnormal state; if the proportion of the number of abnormal historical pressure applications to the total number of historical pressure applications is less than a proportional threshold, then the pressure test state corresponding to the target cell placement layer is determined to be a normal state.

[0151] In one embodiment, the air pressure determination module 520 is further configured to determine the pressure correction value corresponding to the target battery cell placement layer based on the cylinder radius of the proportional valve corresponding to the target battery cell placement layer and the corresponding air pressure output value; and add the original pressure value corresponding to the target battery cell placement layer and the corresponding pressure correction value to obtain the updated pressure value corresponding to the target battery cell placement layer.

[0152] In one embodiment, the pressure testing device 500 further includes: a fitting module;

[0153] The fitting module is used to acquire multiple preset pressure values ​​for the proportional valve corresponding to the target cell placement layer; control the proportional valve corresponding to the target cell placement layer to output air pressure according to each preset pressure value, and calculate the pressure overshoot corresponding to the target cell placement layer when the proportional valve outputs air pressure at each preset pressure value; the pressure overshoot is determined based on the difference between the maximum original pressure value collected by the pressure sensor corresponding to the target cell placement layer and the pressure standard value; based on the correspondence between the preset pressure values ​​and the pressure overshoot corresponding to the target cell placement layer, a fitting curve between the preset pressure values ​​and the pressure overshoot corresponding to the target cell placement layer is obtained; based on the fitting curve, the preset pressure value corresponding to 0 pressure overshoot is determined; the preset pressure value corresponding to 0 pressure overshoot is used as the initial value of the air pressure output value of the proportional valve corresponding to the target cell placement layer.

[0154] In one embodiment, the fitting module is further configured to perform linear fitting on the pneumatic output value and pneumatic feedback value of the target proportional valve, respectively, to obtain a first fitting curve corresponding to the pneumatic output value of the target proportional valve and a second fitting curve corresponding to the pneumatic feedback value of the target proportional valve; the pneumatic output value is the desired pressure value output by the electronic device to the target proportional valve for controlling the target proportional valve, and the pneumatic feedback value is the actual pressure value output by the target proportional valve; the parameter difference between the first fitting curve and the second fitting curve with the same curve parameters is calculated, and if the parameter difference is greater than the difference threshold, the pneumatic output value of the target proportional valve is adjusted.

[0155] This application embodiment determines the updated pressure value corresponding to the target battery cell placement layer based on the original pressure value collected by the pressure sensor corresponding to the target battery cell placement layer and the air pressure output value of the proportional valve. This automatically determines the pressure test status corresponding to the target battery cell placement layer based on the updated pressure value, avoiding the problem of low accuracy caused by manual testing. It can improve the accuracy of pressure testing corresponding to the battery cell during the process of applying pressure to the battery cell. At the same time, compared with the manual testing scheme, this application embodiment can improve the efficiency of pressure testing and save human resources.

[0156] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application.

[0157] like Figure 6 As shown, the electronic device 600 may include:

[0158] Memory 610 storing executable program code;

[0159] Processor 620 coupled to memory 610;

[0160] The processor 620 calls the executable program code stored in the memory 610 to execute any of the stress testing methods disclosed in the embodiments of this application.

[0161] This application discloses a computer-readable storage medium storing a computer program, wherein when the computer program is executed by the processor, the processor implements any of the stress testing methods disclosed in this application.

[0162] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0163] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0164] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0165] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0166] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-accessible memory. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several requests to cause a computer device (which can be a personal computer, server, or network device, specifically a processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of this application.

[0167] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0168] The foregoing has provided a detailed description of a pressure testing method, apparatus, electronic device, and storage medium disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and its core ideas. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method of pressure testing, characterized by, The application is applied to an electronic device, which is in communication connection with a pressure applying device; the pressure applying device comprises a main driving device, proportional valves corresponding to a plurality of electric core placement layers respectively, and pressure sensors corresponding to the plurality of electric core placement layers respectively, each proportional valve is connected with a sub-driving device; in the process that the pressure applying device applies pressure to the electric cores placed in the plurality of electric core placement layers respectively, the main driving device is used for applying downward pressure to the plurality of electric core placement layers, and the proportional valve is used for applying upward supporting force to the corresponding electric core placement layer through the sub-driving device; the method comprises: In the process that the pressure applying device applies pressure to the electric cores placed in the plurality of electric core placement layers respectively, the pressure original values collected by the pressure sensors corresponding to the plurality of electric core placement layers respectively and the air pressure output values of the proportional valves corresponding to the plurality of electric core placement layers respectively are acquired; According to the pressure original value and the air pressure output value corresponding to the target electric core placement layer, the pressure update value corresponding to the target electric core placement layer is determined; the target electric core placement layer is any electric core placement layer; It is judged whether the pressure update value corresponding to the target electric core placement layer is greater than or equal to the pressure sum value corresponding to the previous layer electric core placement layer; the pressure sum value corresponding to the previous layer electric core placement layer is the sum of the pressure update value corresponding to the previous layer electric core placement layer and a preset value; If yes, it is determined that the pressure test state corresponding to the target electric core placement layer is a normal state; If no, it is determined that the pressure test state corresponding to the target electric core placement layer is an abnormal state.

2. The method of claim 1, wherein, Before the judgment whether the pressure update value corresponding to the target electric core placement layer is greater than or equal to the pressure sum value corresponding to the previous layer electric core placement layer, the method further comprises: The number of times of historical applied pressure is determined; In the case that the number of times is greater than a number threshold, after the judgment whether the pressure update value corresponding to the target electric core placement layer is greater than or equal to the pressure sum value corresponding to the previous layer electric core placement layer, the method further comprises: If the pressure update value corresponding to the target electric core placement layer is greater than or equal to the pressure sum value corresponding to the previous layer electric core placement layer, the pressure original values corresponding to the previous layer electric core placement layer in multiple historical applied pressures and the parameters of the main driving device are input into a pressure test model, the pressure prediction values corresponding to the target electric core placement layer in multiple historical applied pressures are determined through the pressure test model according to the pressure original values corresponding to the target electric core placement layer in multiple historical applied pressures and the parameters of the main driving device, and the pressure test state of the target electric core placement layer is determined according to the pressure prediction values corresponding to the target electric core placement layer in multiple historical applied pressures.

3. The method of claim 2, wherein, The determination of the pressure test state of the target electric core placement layer according to the pressure prediction values corresponding to the target electric core placement layer in multiple historical applied pressures comprises: The pressure difference values between the pressure prediction values corresponding to the target electric core placement layer in multiple historical applied pressures and the pressure original values are calculated; determine an abnormal historical applied pressure in which the pressure difference is greater than the pressure threshold value in the plurality of historical applied pressures; if a proportion of the number of the abnormal historical applied pressures to the total number of the historical applied pressures is greater than a proportion threshold value, determine that the pressure test state corresponding to the target battery cell placement layer is an abnormal state; if the proportion of the number of the abnormal historical applied pressures to the total number of the historical applied pressures is less than the proportion threshold value, determine that the pressure test state corresponding to the target battery cell placement layer is a normal state.

4. The method of claim 1, wherein, The method further comprises: determining a pressure correction value corresponding to the target battery cell placement layer according to a cylinder radius of a proportional valve corresponding to the target battery cell placement layer and the gas pressure output value corresponding to the target battery cell placement layer; adding the pressure original value corresponding to the target battery cell placement layer and the pressure correction value corresponding to the target battery cell placement layer to obtain the pressure update value corresponding to the target battery cell placement layer.

5. The method of claim 1, wherein, Before obtaining the pressure original values collected by the pressure sensors corresponding to the plurality of battery cell placement layers respectively and the gas pressure output values of the proportional valves corresponding to the plurality of battery cell placement layers respectively, the method further comprises: obtaining a plurality of pressure preset values of the proportional valve corresponding to the target battery cell placement layer; controlling the proportional valve corresponding to the target battery cell placement layer to output gas pressure according to each of the pressure preset values, and calculating a pressure overshoot amount of the target battery cell placement layer when the proportional valve outputs gas pressure according to each of the pressure preset values; the pressure overshoot amount is determined according to a difference between a maximum pressure original value collected by the pressure sensor corresponding to the target battery cell placement layer and a pressure standard value; obtaining a fitting curve between the pressure preset value and the pressure overshoot amount corresponding to the target battery cell placement layer according to a corresponding relationship between the pressure preset value and the pressure overshoot amount corresponding to the target battery cell placement layer; determining a pressure preset value corresponding to the pressure overshoot amount of 0 according to the fitting curve; taking the pressure preset value corresponding to the pressure overshoot amount of 0 as an initial value of the gas pressure output value of the proportional valve corresponding to the target battery cell placement layer.

6. The method of claim 1, wherein, The method further comprises: linearly fitting the gas pressure output value and the gas pressure feedback value of the target proportional valve respectively to obtain a first fitting curve corresponding to the gas pressure output value of the target proportional valve and a second fitting curve corresponding to the gas pressure feedback value of the target proportional valve; the target proportional valve is any proportional valve, the gas pressure output value is an expected pressure value output by the electronic device to the target proportional valve for controlling the target proportional valve, and the gas pressure feedback value is an actual pressure value output by the target proportional valve; calculating a parameter difference value between the first fitting curve and the second fitting curve corresponding to the same curve parameter, and adjusting the gas pressure output value of the target proportional valve if the parameter difference value is greater than a difference value threshold.

7. A pressure testing device, characterized by The application is applied to an electronic device which is connected with a pressure applying device; the pressure applying device comprises a main driving device, proportional valves corresponding to a plurality of electric core placement layers respectively, and pressure sensors corresponding to the plurality of electric core placement layers respectively; each proportional valve is connected with a sub-driving device; in the process that the pressure applying device applies pressure to the electric cores placed in the plurality of electric core placement layers respectively, the main driving device is used for applying downward pressure to the plurality of electric core placement layers, and the proportional valve is used for applying upward supporting force to the corresponding electric core placement layer through the sub-driving device. The device comprises: a data acquisition module, which is used for acquiring pressure original values collected by the pressure sensors corresponding to the plurality of electric core placement layers respectively and air pressure output values of the proportional valves corresponding to the plurality of electric core placement layers respectively in the process that the pressure applying device applies pressure to the electric cores placed in the plurality of electric core placement layers respectively; a pressure determination module, which is used for determining a pressure update value corresponding to a target electric core placement layer according to the pressure original value and the air pressure output value corresponding to the target electric core placement layer; the target electric core placement layer is any electric core placement layer; a state determination module, which is used for judging whether the pressure update value corresponding to the target electric core placement layer is greater than or equal to a pressure sum value corresponding to a previous electric core placement layer; the pressure sum value corresponding to the previous electric core placement layer is a sum of the pressure update value corresponding to the previous electric core placement layer and a preset value; if yes, determining that a pressure test state corresponding to the target electric core placement layer is a normal state; if no, determining that the pressure test state corresponding to the target electric core placement layer is an abnormal state.

8. An electronic device, comprising: The application comprises a memory and a processor; the memory stores a computer program; when the computer program is executed by the processor, the processor realizes the method according to any one of claims 1 to 6.

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