Pressure control method, device, controller and storage medium of hot-pressing device

Abstract

This application relates to a pressure control method, apparatus, controller, and storage medium for a hot-pressing device. The method includes: acquiring pressure parameters of at least one hot-pressing layer in the hot-pressing device, and adjusting the output parameters of a target force output device in the hot-pressing device according to the acquired pressure parameters. Therefore, in the embodiments of this application, by using a closed-loop control method to adjust the output parameters of the target force output device according to the acquired pressure parameters, the output parameters of the force output devices in the corresponding hot-pressing layers can be adjusted in a timely manner, so that the pressure on the cells in different hot-pressing layers is consistent, which is beneficial to ensuring pressure consistency across different hot-pressing layers.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a pressure control method, apparatus, controller, and storage medium for a hot pressing device. This application is a divisional application of patent application 2023103140169, filed on March 28, 2023, entitled "Pressure Control Method, Apparatus, Controller, and Storage Medium for a Hot Pressing Device". Background Technology

[0002] To improve the energy density and cycle life of battery cells, the manufacturing process of lithium batteries includes a cell hot pressing process. The cell hot pressing process refers to placing the stacked or wound battery cells in a hot pressing device for hot pressing to shape the battery cells.

[0003] Traditional hot pressing devices typically include a first pressure plate at the top, multiple layers of second pressure plates below the first pressure plate, and a lifting drive assembly. The lifting drive assembly is used to drive the first pressure plate and the multiple layers of second pressure plates to move up and down, so as to hot press each layer of the battery cell.

[0004] However, the pressure consistency of different lamination plates in traditional hot pressing devices is poor. Summary of the Invention

[0005] In view of the above problems, this application provides a pressure control method, device, controller and storage medium for a hot pressing device, which can solve the problem of poor pressure consistency in the conventional technology.

[0006] In a first aspect, this application provides a pressure control method for a hot pressing device, the method comprising:

[0007] Obtain the pressure parameters of at least one hot-pressing layer in the hot-pressing device;

[0008] The output parameters of the target force output device in the hot pressing device are adjusted according to the pressure parameters; wherein, the target force output device includes: a first force output device of the first hot pressing layer located at the top of the hot pressing device, and / or a second force output device of the second hot pressing layer located at the non-top of the hot pressing device, the first force output device is used to apply pressure in a first direction to each of the second hot pressing layers, and the second force output device is used to apply a supporting force in a second direction to the corresponding second hot pressing layer.

[0009] In the technical solution of this application embodiment, the pressure parameters of at least one hot-pressing layer in the hot-pressing device are obtained, and the output parameters of the target force output device in the hot-pressing device are adjusted according to the obtained pressure parameters. It can be seen that, in this application embodiment, the closed-loop control method of adjusting the output parameters of the target force output device according to the obtained pressure parameters can adjust the output parameters of the force output device in the corresponding hot-pressing layer in a timely manner, so that the pressure on the battery cells in different hot-pressing layers is consistent, which is beneficial to ensuring the pressure consistency of different hot-pressing layers.

[0010] In some embodiments, obtaining pressure parameters of at least one hot-pressed layer in the hot-pressing apparatus includes:

[0011] Obtain the pressure parameters of each second hot-pressed layer;

[0012] Correspondingly, the output parameters of the target force output device in the hot pressing device are adjusted according to the pressure parameters, including:

[0013] For each second hot-pressed layer, the output parameters of the second force output device in the second hot-pressed layer are adjusted according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer. The target hot-pressed layer is the highest hot-pressed layer in each second hot-pressed layer where the battery cell is placed.

[0014] In the technical solution of this application embodiment, by adjusting the output parameters of the second force output device in the second hot-pressed layer according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer in a closed-loop control mode, the output parameters of the second force output device can be adjusted in a timely manner so that the pressure on the battery cell in the second hot-pressed layer meets the requirements.

[0015] In some embodiments, each second hot-pressed layer is provided with an electro-proportional valve connected to a second force output device. The valve adjusts the output parameters of the second force output device in the second hot-pressed layer based on a first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, including:

[0016] Based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, determine the first output value of the electro-proportional valve installed in the second hot-pressed layer;

[0017] The output pressure of the second force output device in the second hot press layer is adjusted according to the first output value of the electro-proportional valve.

[0018] In the technical solution of this application embodiment, the first output value of the electro-proportional valve set in the second hot-pressed layer is determined according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer. The output pressure of the second force output device in the second hot-pressed layer is adjusted according to the first output value of the electro-proportional valve, so that the pressure on the battery cell in the second hot-pressed layer meets the requirements, thereby helping to ensure the stability of the interlayer pressure difference.

[0019] In some embodiments, determining a first output value of the electro-proportional valve disposed in the second hot-pressed layer based on a first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer includes:

[0020] The proportional coefficient of the electric proportional valve is determined based on the first difference;

[0021] The compensation coefficient of the electric proportional valve is determined based on the proportionality coefficient.

[0022] The first output value of the electro-proportional valve is determined based on the compensation coefficient.

[0023] In some embodiments, determining the proportional coefficient of the electro-proportional valve based on a first difference includes:

[0024] If the first difference is greater than or equal to the first preset difference threshold, then the first preset coefficient is used as the proportional coefficient.

[0025] If the first difference is less than the first preset difference threshold, then the second preset coefficient is used as the proportional coefficient, wherein the first preset coefficient is greater than the second preset coefficient.

[0026] In some embodiments, the first force output device is an electric cylinder, and the second force output device is a pneumatic cylinder. Determining the compensation coefficient of the electric proportional valve based on the proportionality coefficient includes:

[0027] Obtain the dimensional parameters of the electric cylinder and the pneumatic cylinder;

[0028] The compensation coefficient is determined based on the size parameters of the electric cylinder, the size parameters of the pneumatic cylinder, and the proportional coefficient.

[0029] In some embodiments, determining the first output value of the electro-proportional valve based on a compensation coefficient includes:

[0030] The first output value of the electro-proportional valve is determined based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-pressing layer, and the pressure parameters of the target hot-pressing layer.

[0031] In some embodiments, determining a first output value of the electro-proportional valve disposed in the second hot-pressed layer based on a first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer includes:

[0032] After receiving the preset static compensation time of the gravity offset dynamic compensation command, and if the pressure parameter of the target hot-pressed layer is greater than the dynamic compensation start pressure parameter, the first output value of the electric proportional valve set in the second hot-pressed layer is determined every preset dynamic compensation interval based on the first difference between the pressure parameter of the second hot-pressed layer and the pressure parameter of the target hot-pressed layer.

[0033] The technical solution of this application embodiment can not only adjust the output value of the electric proportional valve in a timely manner so that the pressure on the battery cells in different hot-pressed layers is consistent, but also save some processing resources.

[0034] In some embodiments, obtaining pressure parameters of at least one hot-pressed layer in the hot-pressing apparatus includes:

[0035] Obtain the pressure parameters of the target hot-pressed layer;

[0036] Correspondingly, the output parameters of the target force output device in the hot pressing device are adjusted according to the pressure parameters, including:

[0037] Based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, the output parameters of the first force output device are adjusted.

[0038] In the technical solution of this application embodiment, based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, the output parameters of the first force output device can be accurately and timely adjusted by adopting a closed-loop control method, so that the pressure on the battery cells in different second hot-pressed layers meets the requirements, thereby helping to ensure the stability of the interlayer pressure difference.

[0039] In some embodiments, adjusting the output parameters of the first force output device based on a second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters includes:

[0040] If the second difference is less than the second preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the first stroke parameter, wherein the first stroke parameter is used to indicate that the output shaft moves in the first direction;

[0041] If the second difference is greater than the third preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the second stroke parameter, wherein the second stroke parameter is used to indicate that the output shaft moves in a second direction, which is opposite to the first direction.

[0042] In some embodiments, the first stroke parameter includes: a first sub-stroke parameter and a second sub-stroke parameter. Adjusting the stroke parameter of the output shaft of the first force output device to the first stroke parameter includes:

[0043] If the second difference is greater than or equal to the fourth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the first sub-stroke parameter.

[0044] If the second difference is less than the fourth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the second sub-stroke parameter, wherein the distance indicated by the second sub-stroke parameter is greater than the distance indicated by the first sub-stroke parameter.

[0045] In some embodiments, the second stroke parameter includes: a third sub-stroke parameter and a fourth sub-stroke parameter, and adjusting the stroke parameter of the output shaft of the first force output device to the second stroke parameter includes:

[0046] If the second difference is less than or equal to the fifth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the third sub-stroke parameter.

[0047] If the second difference is greater than the fifth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the fourth sub-stroke parameter, wherein the distance indicated by the fourth sub-stroke parameter is greater than the distance indicated by the third sub-stroke parameter.

[0048] In some embodiments, adjusting the output parameters of the first force output device based on a second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters further includes:

[0049] If the second difference is greater than or equal to the second preset difference threshold and less than or equal to the third preset difference threshold, the output parameters of the first force output device are maintained.

[0050] Secondly, this application provides a hot pressing apparatus, which includes:

[0051] A first force output device located at the top of the first hot pressing layer of the hot pressing device is used to apply pressure in a first direction to each of the second hot pressing layers located outside the top of the hot pressing device;

[0052] The second force output device located on each of the second hot-pressed layers (excluding the top of the hot-pressing device) is used to apply a supporting force in the second direction to the corresponding second hot-pressed layer.

[0053] A controller connected to the first force output device and the second force output device is used to execute the method described in the first aspect.

[0054] Thirdly, this application provides a pressure control device for a hot pressing apparatus, the pressure control device comprising:

[0055] The acquisition module is used to acquire the pressure parameters of at least one hot-pressing layer in the hot-pressing device;

[0056] An adjustment module is used to adjust the output parameters of the target force output device in the hot pressing device according to the pressure parameters; wherein, the target force output device includes: a first force output device of a first hot pressing layer located at the top of the hot pressing device, and / or a second force output device of a second hot pressing layer located at a location not at the top of the hot pressing device, the first force output device being used to apply pressure in a first direction to each of the second hot pressing layers, and the second force output device being used to apply a supporting force in a second direction to the corresponding second hot pressing layer.

[0057] Fourthly, this application provides a controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect.

[0058] Fifthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect.

[0059] Sixthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect.

[0060] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0061] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0062] Figure 1 This is a schematic diagram of the structure of a hot pressing device provided in some embodiments of this application;

[0063] Figure 2 A three-dimensional structural schematic diagram of the hot pressing device provided in other embodiments of this application;

[0064] Figure 3 Examples of embodiments of this application Figure 2 A front view structural schematic diagram of the provided hot pressing device;

[0065] Figure 4 A schematic flowchart illustrating the pressure control method of a hot pressing device provided in some embodiments of this application;

[0066] Figure 5 A schematic flowchart illustrating the pressure control method of a hot pressing device provided in other embodiments of this application;

[0067] Figure 6 A schematic diagram of the page for setting dynamic compensation parameters provided in an embodiment of this application;

[0068] Figure 7 A schematic flowchart illustrating the pressure control method of a hot pressing device provided in other embodiments of this application;

[0069] Figure 8 A schematic flowchart illustrating the pressure control method of a hot pressing device provided in other embodiments of this application;

[0070] Figure 9 This is a schematic diagram of the pressure control device of a hot pressing apparatus provided in some embodiments of this application. Detailed Implementation

[0071] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0073] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly defined.

[0074] Traditional hot pressing devices typically include a first pressure plate at the top, multiple layers of second pressure plates below the first pressure plate, and a lifting drive assembly. The lifting drive assembly is used to drive the first pressure plate and the multiple layers of second pressure plates to move up and down, so as to hot press each layer of the battery cell.

[0075] Due to their own weight, the cells in different layers of the hot-pressing device will be subjected to pressure from the pressure plates of different weights. For example, the pressure exerted on the cell by the bottom pressure plate is usually higher than that exerted by the top pressure plate. Therefore, the pressure consistency between the different layers of the hot-pressing device in traditional technology is poor.

[0076] In order to improve the pressure consistency of different laminates, this application proposes to adjust the pressure of different laminates in real time by setting up a closed-loop control system based on the pressure parameters of different laminates detected by the pressure parameter detection component.

[0077] Based on the above considerations, in order to solve the problem of poor pressure consistency of different laminates in traditional technology, this application proposes that the pressure parameters of each laminate on which the battery cell is placed can be measured in real time, and the output parameters of the top force output device located at the top of the hot pressing device and / or each force output device located below the top force output device can be adjusted in real time according to the pressure parameters of each laminate, so that the pressure of different laminates on the corresponding battery cell is consistent.

[0078] For ease of understanding, the structure of the hot pressing device will be briefly described in the embodiments of this application.

[0079] In some embodiments, Figure 1 This is a schematic diagram of the structure of a hot pressing device provided in some embodiments of this application, such as... Figure 1 As shown, the hot pressing device in this application embodiment may include: a first force output device 10 located at the top of the hot pressing device, a first hot pressing layer L1, a plurality of second hot pressing layers L2 located below the first hot pressing layer L1, and a controller 12 connected to the first force output device 10 and a second force output device 11 in each of the second hot pressing layers L2. Exemplarily, the controller 12 involved in this application embodiment may include, but is not limited to, a programmable logic controller (PLC).

[0080] It should be noted that the connection between the controller 12 and any force output device can mean that the controller 12 is directly connected to the force output device, or that the controller 12 is indirectly connected to the force output device through an intermediate component.

[0081] The first force output device 10 in this embodiment is used to apply pressure in a first direction D1 to each of the second hot-pressing layers L2 located outside the top of the hot-pressing device, so as to compact the battery cells located in any of the second hot-pressing layers L2. Exemplarily, the first force output device 10 in this embodiment may include, but is not limited to, an electric cylinder.

[0082] It should be understood that each of the second hot-pressed layers L2 may contain a corresponding battery cell, or some of the second hot-pressed layers L2 may contain a corresponding battery cell.

[0083] In the embodiments of this application, the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers where the battery cell is placed.

[0084] For example, if a battery cell is placed in the second hot-pressed layer (i.e., the first second hot-pressed layer in the direction from the top to the bottom) adjacent to the first hot-pressed layer L1, then the second hot-pressed layer is the target hot-pressed layer; if no battery cell is placed in the second hot-pressed layer (i.e., the first second hot-pressed layer in the direction from the top to the bottom), and a battery cell is placed in the second second hot-pressed layer in the direction from the top to the bottom, then the second hot-pressed layer is the target hot-pressed layer.

[0085] In this embodiment, the second force output device 12 in any second hot-pressed layer L2 can be disposed between the upper and lower pressure plates of the corresponding second hot-pressed layer L2, for applying a supporting force in the second direction D2 to the corresponding second hot-pressed layer L2, so as to overcome the self-weight of the upper hot-pressed layer and facilitate the offsetting of the pressure difference between different hot-pressed layers. Exemplarily, the second force output device 12 in this embodiment may include, but is not limited to, a cylinder.

[0086] It should be understood that the second force output device 12 in any second hot-pressed layer L2 in the embodiments of this application can also be used to control the components in the corresponding second hot-pressed layer L2 to move along the first direction or the second direction.

[0087] For example, any second hot-pressed layer in the embodiments of this application may be provided with an electro-proportional valve connected to a second force output device, so that the controller in the embodiments of this application can be indirectly connected to the corresponding second force output device through the electro-proportional valve.

[0088] It should be understood that any hot-pressed layer in the embodiments of this application may also be provided with a corresponding pressure parameter detection component, so as to detect the pressure parameters of each hot-pressed layer in real time. For example, the pressure parameter detection component in the embodiments of this application may include, but is not limited to, a pressure sensor.

[0089] The controller in this application embodiment can be used to execute the pressure control method provided in this application embodiment so that the pressure on the battery cells in different hot-pressed layers is consistent, which is beneficial to ensuring the pressure consistency of different hot-pressed layers.

[0090] In some embodiments, Figure 2 This is a three-dimensional structural schematic diagram of the hot pressing device provided in some other embodiments of this application. Figure 3 Examples of embodiments of this application Figure 2 The provided front view structural schematic diagram of the hot pressing device, based on the above embodiments, takes the first force output device 10 as an electric cylinder, the second force output device 11 as a pneumatic cylinder, and the pressure parameter detection component as a pressure sensor as examples to introduce the overall structure of the hot pressing device.

[0091] like Figure 2 and Figure 3 As shown, the hot pressing device of this application embodiment may include: a first hot pressing layer L1 located at the top of the hot pressing device and a plurality of second hot pressing layers L2 located below the first hot pressing layer L1. The first hot pressing layer L1 is provided with an electric cylinder 10 for applying pressure in a first direction to each of the second hot pressing layers located outside the top of the hot pressing device.

[0092] For example, the first hot-pressed layer L1 may also include a top-pressing drive block 13 for reducing the travel of the electric cylinder 10 in the first or second direction.

[0093] The second hot-pressed layer L2 in this embodiment may include, but is not limited to: an upper pressure plate, a lower pressure plate, a pressure sensor 14 disposed at the bottom of the upper pressure plate (which can be used to detect the pressure of the upper pressure plate in the hot-pressed layer, or the pressure on the battery cell), a cylinder 11 disposed between the upper and lower pressure plates, and an electro-proportional valve 15 connected to the cylinder 11. It should be understood that two adjacent hot-pressed layers may share a pressure plate. For example, the lower pressure plate of the first hot-pressed layer from top to bottom may share a pressure plate with the upper pressure plate of the adjacent second hot-pressed layer.

[0094] For example, a guide post 16 may be provided between the upper and lower pressure plates of each hot-pressed layer so that the corresponding hot-pressed layer can move in the first or second direction, and also helps to maintain the relative horizontality of the hot-pressed layer.

[0095] It should be noted that the size parameters (e.g., cylinder diameter) of any cylinder in the embodiments of this application can be determined based on the fact that the air pressure can overcome its own weight under a preset air pressure (e.g., 0.3MPa), so as to ensure the adjustment range during pressure difference adjustment.

[0096] Of course, the pressure control method of the hot pressing device in this application embodiment can also be applied to other hot pressing devices, and this application embodiment does not limit this.

[0097] In some embodiments, Figure 4 This is a schematic flowchart of a pressure control method for a hot pressing device provided in some embodiments of this application. In these embodiments, the method is applied to... Figure 1 Let's take the controller in the example as an illustration. Figure 4 As shown, the method in this application embodiment may include the following steps:

[0098] Step S401: Obtain the pressure parameters of at least one hot-pressing layer in the hot-pressing device.

[0099] In this step, the controller can acquire the pressure parameters of at least one hot pressing layer in the hot pressing device in real time, so as to adjust the output parameters of the target force output device in the hot pressing device in a timely manner according to the pressure parameters of at least one hot pressing layer. The target force output device may include: a first force output device of a first hot pressing layer located at the top of the hot pressing device, and / or a second force output device of a second hot pressing layer located at a location other than the top of the hot pressing device.

[0100] For example, the controller can obtain the pressure parameters of at least one hot-pressed layer through a pressure parameter detection component in the hot-pressing device, wherein the pressure parameter detection component may include, but is not limited to, a pressure sensor.

[0101] It should be noted that, for ease of description, the following embodiments of this application use the method of the controller obtaining the pressure parameters of at least one hot-pressed layer through the pressure parameter detection component as an example.

[0102] As another example, the controller may obtain pressure parameters of at least one hot-pressed layer through other components or devices.

[0103] Of course, the controller can also obtain the pressure parameters of at least one hot-pressed layer through other means, which is not limited in this embodiment.

[0104] In one possible implementation, the controller can acquire the pressure parameters of each of the second hot-pressed layers.

[0105] In this implementation, the controller can obtain the pressure parameters of each second hot pressing layer so that the output parameters of the second force output device of each second hot pressing layer can be adjusted.

[0106] It should be noted that the pressure parameters of any second hot-pressed layer involved in the embodiments of this application can be used to indicate the pressure applied by the upper pressure plate in the second hot-pressed layer to the battery cell in the second hot-pressed layer.

[0107] For example, if each second hot-pressed layer is provided with a corresponding pressure parameter detection component, the controller can obtain the pressure parameter of the corresponding second hot-pressed layer through each pressure parameter detection component.

[0108] Of course, the controller can also obtain the pressure parameters of each second hot-pressed layer in other ways, which is not limited in this embodiment.

[0109] In another possible implementation, the controller can acquire the pressure parameters of the target hot-pressed layer.

[0110] In this implementation, the controller can obtain the pressure parameters of the target hot-pressed layer so that the output parameters of the first force output device of the first hot-pressed layer can be adjusted.

[0111] For example, if a corresponding pressure parameter detection component is provided in the target hot-pressed layer, the controller can obtain the pressure parameter of the target hot-pressed layer through the pressure parameter detection component in the target hot-pressed layer.

[0112] Of course, the controller can also obtain the pressure parameters of the target hot-pressed layer through other means, which is not limited in this embodiment.

[0113] Step S402: Adjust the output parameters of the target force output device in the hot pressing device according to the pressure parameters.

[0114] In this step, the controller can adjust the output parameters of the target force output device in the hot pressing device based on the pressure parameters of at least one hot pressing layer obtained in step S401 above. The target force output device may include: a first force output device of the first hot pressing layer located at the top of the hot pressing device, and / or a second force output device of the second hot pressing layer located at a location other than the top of the hot pressing device.

[0115] For example, if the pressure parameters of at least one hot-pressed layer in step S401 include the pressure parameters of each second hot-pressed layer, then the target force output device may include the second force output device of each second hot-pressed layer.

[0116] In another example, if the pressure parameters of at least one hot-pressed layer in step S401 above include the pressure parameters of the target hot-pressed layer, then the target force output device may include the first force output device of the first hot-pressed layer.

[0117] It should be understood that if the pressure parameters of at least one hot-pressed layer in step S401 above include the pressure parameters of each second hot-pressed layer, since the target hot-pressed layer is the highest hot-pressed layer in each second hot-pressed layer where the battery cell is placed, the pressure parameters of each second hot-pressed layer may include the pressure parameters of the target hot-pressed layer, then the target force output device may include the second force output device of each second hot-pressed layer and the first force output device of the first hot-pressed layer.

[0118] As can be seen, in this embodiment of the application, by adjusting the output parameters of the target force output device according to the pressure parameters of at least one hot-pressed layer, the output parameters of the force output device in the corresponding hot-pressed layer can be adjusted in a timely manner when the pressure parameters of any hot-pressed layer meet the preset adjustment conditions, so that the pressure on the battery cells in different hot-pressed layers is consistent, which is beneficial to ensuring the pressure consistency of different hot-pressed layers.

[0119] In summary, in this embodiment, by acquiring the pressure parameters of at least one hot-pressing layer in the hot-pressing device, and adjusting the output parameters of the target force output device in the hot-pressing device according to the acquired pressure parameters, it can be seen that the closed-loop control method of adjusting the output parameters of the target force output device according to the acquired pressure parameters in this embodiment can adjust the output parameters of the force output device in the corresponding hot-pressing layer in a timely manner, so as to ensure that the pressure on the battery cells in different hot-pressing layers is consistent, which is beneficial to ensuring the pressure consistency of different hot-pressing layers. In addition, the closed-loop control method of adjusting the output parameters of the target force output device in a timely manner by adjusting the pressure parameters can also overcome the influence of frictional resistance, which is beneficial to improving the pressure stability of different hot-pressing layers.

[0120] In some embodiments, based on the above embodiments, this application describes a possible implementation of "adjusting the output parameters of the target force output device in the hot pressing device according to the pressure parameters" in step S402 above.

[0121] Optionally, if step S401 includes obtaining the pressure parameters of each second hot-pressed layer, for each second hot-pressed layer, the output parameters of the second force output device in the second hot-pressed layer are adjusted according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, wherein the target hot-pressed layer is the highest hot-pressed layer in each second hot-pressed layer in which the battery cell is placed.

[0122] In this embodiment, for each second hot-pressed layer, the controller can adjust the output parameters of the second force output device in the second hot-pressed layer if the controller detects that the pressure parameters of the second hot-pressed layer meet preset adjustment conditions based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer. For example, the output parameters of the second force output device may include, but are not limited to, the output pressure of the second force output device.

[0123] For example, each of the second hot-pressing layers in this application embodiment may be provided with an electro-proportional valve connected to the second force output device, or the controller in this application embodiment may be indirectly connected to the corresponding second force output device through the electro-proportional valves of each of the second hot-pressing layers. It should be understood that the electro-proportional valve in any second hot-pressing layer in this application embodiment is used to control the output pressure of the corresponding second force output device.

[0124] Figure 5 This is a flowchart illustrating the pressure control method of a hot-pressing device provided in other embodiments of this application. Based on the above embodiments, this application describes the process of "adjusting the output parameters of the second force output device in the second hot-pressing layer according to the first difference between the pressure parameters of the second hot-pressing layer and the pressure parameters of the target hot-pressing layer." Figure 5 As shown, the method in this application embodiment may include the following steps:

[0125] Step S501: Determine the first output value of the electro-proportional valve installed in the second hot-pressing layer based on the first difference between the pressure parameters of the second hot-pressing layer and the pressure parameters of the target hot-pressing layer.

[0126] In this step, the controller can determine the compensation coefficient of the electro-proportional valve based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, and determine the first output value of the electro-proportional valve based on the compensation coefficient of the electro-proportional valve.

[0127] Optionally, the controller can determine the proportional coefficient of the electro-proportional valve based on the first difference; further, it can determine the compensation coefficient of the electro-proportional valve based on the proportional coefficient; and further, it can determine the first output value of the electro-proportional valve based on the compensation coefficient.

[0128] For example, if the first difference is greater than or equal to the first preset difference threshold (or the fast / slow proportional coefficient switching threshold), the controller can use the first preset coefficient (or the fast compensation proportional coefficient) as the proportional coefficient of the electric proportional valve; if the first difference is less than the first preset difference threshold, the controller can use the second preset coefficient (or the slow compensation proportional coefficient) as the proportional coefficient, wherein the first preset coefficient is greater than the second preset coefficient. For example, the first preset difference threshold can be 200 or 400, the first preset coefficient can be 50 or 60, and the second preset coefficient can be 20 or 30; of course, the first preset difference threshold, the first preset coefficient, and the second preset coefficient can also be other values, which are not limited in this embodiment.

[0129] Furthermore, when the first force output device is an electric cylinder and the second force output device is a pneumatic cylinder, the controller can obtain the size parameters of the electric cylinder and the pneumatic cylinder, and determine the compensation coefficient based on the size parameters of the electric cylinder, the size parameters of the pneumatic cylinder, and the proportional coefficient.

[0130] It should be understood that the controller can obtain the dimensional parameters of the first force output device and the second force output device in advance, wherein the dimensional parameters may include, but are not limited to, the cylinder diameter.

[0131] For example, the controller can determine the compensation coefficient of the electric proportional valve by the following formula (1) based on the size parameters of the electric cylinder, the size parameters of the air cylinder, and the proportional coefficient.

[0132]

[0133] Where C1 represents the compensation coefficient, F represents the proportional coefficient, B0 represents the cylinder size parameter, and B tThese represent the dimensional parameters of the electric cylinder.

[0134] Of course, the controller can also determine the compensation coefficient of the electric proportional valve through other variations or equivalent formulas of the above formula (1) based on the size parameters of the electric cylinder, the size parameters of the air cylinder and the proportional coefficient. This is not limited in the embodiments of this application.

[0135] Furthermore, the controller can determine the first output value of the electro-proportional valve based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-pressing layer, and the pressure parameters of the target hot-pressing layer, wherein the target hot-pressing layer is the highest hot-pressing layer on which the battery cell is placed.

[0136] For example, the controller can determine the first output value of the electro-proportional valve by the following formula (2) based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-press layer (i.e., the calculated pressure parameters of the second hot-press layer) and the pressure parameters of the target hot-press layer.

[0137] V out =P0*C1 / C0+V0-P m *C1 / CO Formula (2)

[0138] Among them, V out P represents the first output value of the electro-proportional valve, P0 represents the calculated pressure parameter of the second hot-pressing layer, C1 represents the compensation coefficient of the electro-proportional valve, C0 represents the preset coefficient factor, V0 represents the current second output value of the electro-proportional valve, and P... m The pressure parameters represent the target hot-pressed layer.

[0139] Of course, the controller can also determine the first output value of the electro-proportional valve by other variations or equivalent formulas of the above formula (2) based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot pressing layer and the pressure parameters of the target hot pressing layer. This is not limited in the embodiments of this application.

[0140] Optionally, after receiving a preset static compensation duration for the gravity-counting dynamic compensation command, and when the pressure parameter of the target hot-pressed layer is greater than the dynamic compensation start-up pressure parameter, the controller can determine the first output value of the electro-proportional valve set in the second hot-pressed layer at preset dynamic compensation intervals (e.g., 0.05s, 0.1s, or 0.15s, etc.) based on the first difference between the pressure parameter of the second hot-pressed layer and the pressure parameter of the target hot-pressed layer. This not only allows for timely adjustment of the output value of the electro-proportional valve to ensure consistent pressure on the cells in different hot-pressed layers, but also saves some processing resources.

[0141] It should be understood that within the preset static compensation period, the output value of the electro-proportional valve can be a preset output value, so as to unify the force bias of different hot-pressing layers and reduce the difficulty of dynamic adjustment. For example, the preset output value can be a value determined based on a preset gravity compensation value and a preset initial proportional valve offset value. For instance, the preset output value can be equal to the sum of the preset gravity compensation value and the preset initial proportional valve offset value.

[0142] Figure 6 This is a schematic diagram of the page for setting dynamic compensation parameters provided in an embodiment of this application, such as... Figure 6 As shown, for any set of electro-proportional valves in each thermo-pressing device (e.g., proportional valves A1-B4 or proportional valves B1-B4), the dynamic compensation parameter settings may include, but are not limited to: a first preset coefficient setting, a second preset coefficient setting, a preset initial proportional valve offset value setting, a preset dynamic compensation interval setting, a first preset difference threshold setting, a dynamic compensation start pressure parameter setting, and a preset static compensation duration setting.

[0143] It should be understood that the dynamic compensation parameter setting page in the embodiments of this application may also include a gravity cancellation dynamic compensation control, so that the controller can know that a gravity cancellation dynamic compensation instruction has been received when it detects that the gravity cancellation dynamic compensation control is in a triggered state.

[0144] Figure 7 This is a flowchart illustrating a pressure control method for a hot-pressing device provided in other embodiments of this application. Based on the above embodiments, this application describes the process of "determining the first output value of the electro-proportional valve installed in the second hot-pressing layer based on the first difference between the pressure parameters of the second hot-pressing layer and the pressure parameters of the target hot-pressing layer." Figure 7 As shown, the method in this application embodiment may include the following steps:

[0145] Step S701: Determine whether the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer is less than a first preset difference threshold.

[0146] If the first difference is less than the first preset difference threshold, then step S702 is executed; if the first difference is not less than the first preset difference threshold, then step S703 is executed.

[0147] Step S702: Use the second preset coefficient as the proportional coefficient of the electric proportional valve.

[0148] Step S703: Use the first preset coefficient as the proportional coefficient of the electric proportional valve.

[0149] Step S704: Determine the compensation coefficient of the electric proportional valve based on the size parameters of the electric cylinder, the size parameters of the pneumatic cylinder, and the proportional coefficient.

[0150] Step S705: Determine the first output value of the electro-proportional valve based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-pressing layer, and the pressure parameters of the target hot-pressing layer.

[0151] Step S706: Set the interval to the preset dynamic compensation interval, then return to step S701.

[0152] As can be seen, in this embodiment, for any second hot-pressed layer, based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, the size parameters of the first force output device, the size parameters of the second force output device, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-pressed layer, and the pressure parameters of the target hot-pressed layer, the first output value of the electro-proportional valve can be accurately and timely adjusted by adopting a closed-loop control method. This allows the output pressure of the second force output device in the second hot-pressed layer to be accurately adjusted based on the first output value of the electro-proportional valve, so that the pressure on the battery cell in the second hot-pressed layer meets the requirements.

[0153] Step S502: Adjust the output pressure of the second force output device in the second hot pressing layer according to the first output value of the electric proportional valve.

[0154] In this step, the controller can adjust the output pressure of the second force output device in the second hot-pressed layer according to the first output value of the electro-proportional valve determined in step S501 above, so that the pressure on the battery cell in the second hot-pressed layer meets the requirements, thereby helping to ensure the stability of the interlayer pressure difference.

[0155] In summary, in this embodiment of the application, the first output value of the electro-proportional valve set in the second hot-pressed layer is determined based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer. The output pressure of the second force output device in the second hot-pressed layer is adjusted according to the first output value of the electro-proportional valve, so that the pressure on the battery cell in the second hot-pressed layer meets the requirements, thereby helping to ensure the stability of the interlayer pressure difference.

[0156] In some embodiments, based on the above embodiments, this application describes another possible implementation of "adjusting the output parameters of the target force output device in the hot pressing device according to the pressure parameters" in step S402 above.

[0157] Optionally, if step S401 includes obtaining the pressure parameters of the target hot-pressed layer, the output parameters of the first force output device are adjusted according to the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters.

[0158] For example, the preset working pressure parameter involved in the embodiments of this application may include, but is not limited to, the center value of a preset working pressure range (or working process range).

[0159] In this embodiment, the controller can adjust the output parameters of the first force output device when it detects that the pressure parameters of the target hot-pressed layer meet the preset adjustment conditions based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters. For example, the output parameters of the first force output device may include, but are not limited to, the stroke parameters of the output shaft of the first force output device, so that the position of the output shaft of the first force output device can be adjusted according to the output parameters of the first force output device.

[0160] In one possible implementation, if the second difference is less than a second preset difference threshold, the controller can adjust the stroke parameter of the output shaft of the first force output device to a first stroke parameter, wherein the first stroke parameter is used to indicate that the output shaft moves in a first direction. It should be understood that if the first force output device is an electric cylinder, then the output shaft of the first force output device can refer to the motor output shaft in the electric cylinder.

[0161] For example, the second preset difference threshold can be -5 or -10; of course, the second preset difference threshold can also be other values, which are not limited in this embodiment.

[0162] The first travel parameter in the embodiments of this application may include, but is not limited to, a first sub-travel parameter and a second sub-travel parameter, wherein the distance indicated by the second sub-travel parameter is greater than the distance indicated by the first sub-travel parameter.

[0163] For example, if the second difference is greater than or equal to the fourth preset difference threshold, the controller can adjust the stroke parameter of the output shaft of the first force output device to the first sub-stroke parameter. For example, the fourth preset difference threshold can be -200 or -210; of course, the fourth preset difference threshold can also be other values, which are not limited in this embodiment.

[0164] As another example, if the second difference is less than the fourth preset difference threshold, the controller can adjust the stroke parameter of the output shaft of the first force output device to the second sub-stroke parameter.

[0165] In another possible implementation, if the second difference is greater than the third preset difference threshold, the controller can adjust the stroke parameter of the output shaft of the first force output device to the second stroke parameter, wherein the second stroke parameter is used to indicate that the output shaft moves in a second direction, which is opposite to the first direction.

[0166] For example, the third preset difference threshold can be 40 or 50; of course, the third preset difference threshold can also be other values, which are not limited in this embodiment.

[0167] The second travel parameter in the embodiments of this application may include, but is not limited to, a third sub-travel parameter and a fourth sub-travel parameter, wherein the distance indicated by the fourth sub-travel parameter is greater than the distance indicated by the third sub-travel parameter.

[0168] For example, if the second difference is less than or equal to the fifth preset difference threshold, the controller can adjust the stroke parameter of the output shaft of the first force output device to the third sub-stroke parameter. For example, the fifth preset difference threshold can be 200 or 210; of course, the fifth preset difference threshold can also be other values, which are not limited in this embodiment.

[0169] As another example, if the second difference is greater than the fifth preset difference threshold, the controller can adjust the stroke parameter of the output shaft of the first force output device to the fourth sub-stroke parameter.

[0170] It should be noted that the specific distance indicated by any stroke parameter involved in the embodiments of this application can be determined based on the elastic coefficient of the battery cell, etc.

[0171] In another possible implementation, if the second difference is greater than or equal to the second preset difference threshold and less than or equal to the third preset difference threshold, the controller can maintain the output parameters of the first force output device.

[0172] Figure 8 This is a flowchart illustrating the pressure control method of a hot-pressing device provided in other embodiments of this application. Based on the above embodiments, this application describes the relevant content of "adjusting the output parameters of the first force output device according to the second difference between the pressure parameters of the target hot-pressing layer and the preset working pressure parameters." Figure 8 As shown, the method in this application embodiment may include the following steps:

[0173] Step S801: Determine the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters.

[0174] If the second difference is greater than or equal to the second preset difference threshold and less than or equal to the third preset difference threshold, then proceed to step S802; if the second difference is less than the second preset difference threshold and greater than or equal to the fourth preset difference threshold, then proceed to step S803; if the second difference is less than the fourth preset difference threshold, then proceed to step S804; if the second difference is greater than the third preset difference threshold and less than or equal to the fifth preset difference threshold, then proceed to step S805; if the second difference is greater than the fifth preset difference threshold, then proceed to step S806.

[0175] Step S802: Maintain the output parameters of the first force output device.

[0176] Step S803: Adjust the stroke parameter of the output shaft of the first force output device to the first sub-stroke parameter.

[0177] Step S804: Adjust the stroke parameter of the output shaft of the first force output device to the second sub-stroke parameter.

[0178] Step S805: Adjust the stroke parameter of the output shaft of the first force output device to the third sub-stroke parameter.

[0179] Step S806: Adjust the stroke parameter of the output shaft of the first force output device to the fourth sub-stroke parameter.

[0180] Step S807: After adjusting the position of the output shaft of the first force output device according to the stroke parameters of the output shaft of the first force output device, return to step S801.

[0181] In summary, in this embodiment of the application, based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, the output parameters of the first force output device can be accurately and timely adjusted by adopting a closed-loop control method, so that the pressure on the cells in different second hot-pressed layers meets the requirements, thereby helping to ensure the stability of the interlayer pressure difference.

[0182] It should be understood that when step S401 includes obtaining the pressure parameters of each second hot-pressed layer (which may include the pressure parameters of the target hot-pressed layer), for each second hot-pressed layer, the controller can adjust the output parameters of the second force output device in the second hot-pressed layer according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, and can also adjust the output parameters of the first force output device according to the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters.

[0183] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0184] Based on the same inventive concept, this application also provides a hot pressing device for implementing the pressure control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more hot pressing device embodiments provided below can be found in the limitations of the pressure control method described above, and will not be repeated here.

[0185] In some embodiments of this application, the hot pressing device (structural schematic diagram can be referred to the above) Figure 1 (As shown) may include:

[0186] A first force output device located at the top of the first hot pressing layer of the hot pressing device is used to apply pressure in a first direction to each of the second hot pressing layers located outside the top of the hot pressing device;

[0187] The second force output device located on each of the second hot-pressed layers (excluding the top of the hot-pressing device) is used to apply a supporting force in the second direction to the corresponding second hot-pressed layer.

[0188] The controller connected to the first force output device and the second force output device is used to execute the technical solution of the pressure control method described above in this application. Its implementation principle and technical effect are similar, and will not be repeated here.

[0189] Based on the same inventive concept, this application also provides a pressure control device for implementing the pressure control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more pressure control device embodiments provided below can be found in the limitations of the pressure control method described above, and will not be repeated here.

[0190] In some embodiments, Figure 9 This is a schematic diagram of the structure of a pressure control device for a hot pressing apparatus provided in some embodiments of this application. The pressure control device provided in the embodiments of this application can be applied to the controller in a hot pressing apparatus. Figure 9 As shown, the pressure control device in this application embodiment may include: an acquisition module 901 and an adjustment module 902.

[0191] The acquisition module 901 is used to acquire the pressure parameters of at least one hot-pressing layer in the hot-pressing device.

[0192] The adjustment module 902 is used to adjust the output parameters of the target force output device in the hot pressing device according to the pressure parameters; wherein, the target force output device includes: a first force output device of the first hot pressing layer located at the top of the hot pressing device, and / or a second force output device of the second hot pressing layer located at the non-top of the hot pressing device, the first force output device is used to apply pressure in a first direction to each of the second hot pressing layers, and the second force output device is used to apply a supporting force in a second direction to the corresponding second hot pressing layer.

[0193] In some embodiments, the acquisition module 901 is specifically used for:

[0194] Obtain the pressure parameters of each second hot-pressed layer;

[0195] Correspondingly, adjustment module 902 includes:

[0196] The first adjustment unit is used to adjust the output parameters of the second force output device in the second hot-pressed layer according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, wherein the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers in which the battery cell is placed.

[0197] In some embodiments, each of the second hot-pressed layers is provided with an electrical proportional valve connected to the second force output device, and the first adjustment unit includes:

[0198] The first determining subunit is used to determine the first output value of the electro-proportional valve installed in the second hot-pressed layer based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer.

[0199] The adjustment subunit is used to adjust the output pressure of the second force output device in the second hot press layer according to the first output value of the electro-proportional valve.

[0200] In some embodiments, the first determining subunit is specifically used for:

[0201] The proportional coefficient of the electric proportional valve is determined based on the first difference;

[0202] The compensation coefficient of the electric proportional valve is determined based on the proportionality coefficient.

[0203] The first output value of the electro-proportional valve is determined based on the compensation coefficient.

[0204] In some embodiments, the first determining subunit is specifically used for;

[0205] If the first difference is greater than or equal to the first preset difference threshold, then the first preset coefficient is used as the proportional coefficient.

[0206] If the first difference is less than the first preset difference threshold, then the second preset coefficient is used as the proportional coefficient, wherein the first preset coefficient is greater than the second preset coefficient.

[0207] In some embodiments, the first force output device is an electric cylinder, the second force output device is a pneumatic cylinder, and the first determining subunit is specifically used for:

[0208] Obtain the dimensional parameters of the electric cylinder and the pneumatic cylinder;

[0209] The compensation coefficient is determined based on the size parameters of the electric cylinder, the size parameters of the pneumatic cylinder, and the proportional coefficient.

[0210] In some embodiments, the first determining subunit is specifically used for:

[0211] The first output value of the electro-proportional valve is determined based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-pressing layer, and the pressure parameters of the target hot-pressing layer.

[0212] In some embodiments, the first determining subunit is specifically used for:

[0213] After receiving the preset static compensation time of the gravity offset dynamic compensation command, and if the pressure parameter of the target hot-pressed layer is greater than the dynamic compensation start pressure parameter, the first output value of the electric proportional valve set in the second hot-pressed layer is determined every preset dynamic compensation interval based on the first difference between the pressure parameter of the second hot-pressed layer and the pressure parameter of the target hot-pressed layer.

[0214] In some embodiments, the acquisition module 901 is specifically used for:

[0215] Obtain the pressure parameters of the target hot-pressed layer;

[0216] Correspondingly, adjustment module 902 includes:

[0217] The second adjustment unit is used to adjust the output parameters of the first force output device according to the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters.

[0218] In some embodiments, the second adjustment unit is specifically used for:

[0219] If the second difference is less than the second preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the first stroke parameter, wherein the first stroke parameter is used to indicate that the output shaft moves in the first direction;

[0220] If the second difference is greater than the third preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the second stroke parameter, wherein the second stroke parameter is used to indicate that the output shaft moves in a second direction, which is opposite to the first direction.

[0221] In some embodiments, the first stroke parameter includes: a first sub-stroke parameter and a second sub-stroke parameter, and the second adjustment unit is specifically used for:

[0222] If the second difference is greater than or equal to the fourth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the first sub-stroke parameter.

[0223] If the second difference is less than the fourth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the second sub-stroke parameter, wherein the distance indicated by the second sub-stroke parameter is greater than the distance indicated by the first sub-stroke parameter.

[0224] In some embodiments, the second stroke parameter includes a third sub-stroke parameter and a fourth sub-stroke parameter, and the second adjustment unit is specifically used for:

[0225] If the second difference is less than or equal to the fifth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the third sub-stroke parameter.

[0226] If the second difference is greater than the fifth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the fourth sub-stroke parameter, wherein the distance indicated by the fourth sub-stroke parameter is greater than the distance indicated by the third sub-stroke parameter.

[0227] In some embodiments, the second adjustment unit is further specifically used for:

[0228] If the second difference is greater than or equal to the second preset difference threshold and less than or equal to the third preset difference threshold, the output parameters of the first force output device are maintained.

[0229] The pressure control device of the hot pressing device provided in this application embodiment can be used to execute the technical solution in the pressure control method embodiment of this application. Its implementation principle and technical effect are similar, and will not be repeated here.

[0230] Each module in the aforementioned pressure control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the controller in hardware form or independent of it, or stored in the memory of the controller in software form, so that the processor can call and execute the corresponding operations of each module.

[0231] In some embodiments, a controller is also provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the technical solutions in the pressure control method embodiments of the present application. The implementation principle and technical effects are similar, and will not be repeated here.

[0232] In some embodiments, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the technical solutions in the pressure control method embodiments of the present application. The implementation principle and technical effects are similar, and will not be repeated here.

[0233] In some embodiments, a computer program product is also provided, including a computer program that, when executed by a processor, implements the technical solutions in the pressure control method embodiments described above. The implementation principle and technical effects are similar and will not be repeated here.

[0234] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited thereto.

[0235] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure control method for a hot pressing device, characterized in that, The method includes: Obtain the pressure parameters of at least one hot-pressing layer in the hot-pressing device; The pressure of at least one of the hot-pressing layers in the hot-pressing device is adjusted according to the pressure parameters of the at least one hot-pressing layer; The hot-pressed layer includes multiple second hot-pressed layers; each of the second hot-pressed layers is provided with an electrical proportional valve connected to a second force output device in the second hot-pressed layer; The process of obtaining the pressure parameters of at least one hot-pressing layer in the hot-pressing device includes: Obtain the pressure parameters of each of the second hot-pressed layers; obtain the pressure parameters of the target hot-pressed layer; Adjusting the pressure of at least one hot-pressing layer in the hot-pressing device according to the pressure parameters of the at least one hot-pressing layer includes: Based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, the first output value of the electro-proportional valve installed in the second hot-pressed layer is determined; wherein, the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers in which the battery cell is placed; The output pressure of the second force output device in the second hot-pressing layer is adjusted according to the first output value of the electro-proportional valve. The step of determining the first output value of the electro-proportional valve installed in the second hot-pressed layer based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer includes: After receiving the preset static compensation time of the gravity offset dynamic compensation command, and when the pressure parameter of the target hot-pressed layer is greater than the dynamic compensation start pressure parameter, the first output value of the electro-proportional valve set in the second hot-pressed layer is determined every preset dynamic compensation interval based on the first difference between the pressure parameter of the second hot-pressed layer and the pressure parameter of the target hot-pressed layer.

2. The method according to claim 1, characterized in that, Adjusting the pressure of at least one hot-pressing layer in the hot-pressing device according to the pressure parameters of the at least one hot-pressing layer includes: The output parameters of the target force output device in the hot pressing device are adjusted according to the pressure parameters of the at least one hot pressing layer; wherein the target force output device is used to control the pressure of at least one of the hot pressing layers.

3. The method according to claim 2, characterized in that, The target force output device includes: a first force output device located on the top of the first hot pressing layer of the hot pressing device, and / or a second force output device located on the second hot pressing layer not on the top of the hot pressing device. The first force output device is used to apply pressure in a first direction to each of the second hot pressing layers, and the second force output device is used to apply a supporting force in a second direction to the corresponding second hot pressing layer.

4. The method according to claim 2, characterized in that, Adjusting the output parameters of the target force output device in the hot pressing device according to the pressure parameters of the at least one hot pressing layer includes: For each of the second hot-pressed layers, the output parameters of the second force output device in the second hot-pressed layer are adjusted according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, wherein the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers in which the battery cell is placed.

5. The method according to claim 1, characterized in that, The step of determining the first output value of the electro-proportional valve installed in the second hot-pressed layer based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer includes: The proportional coefficient of the electric proportional valve is determined based on the first difference; The compensation coefficient of the electric proportional valve is determined based on the proportionality coefficient. The first output value of the electro-proportional valve is determined based on the compensation coefficient.

6. The method according to claim 5, characterized in that, Determining the proportional coefficient of the electro-proportional valve based on the first difference includes: If the first difference is greater than or equal to the first preset difference threshold, then the first preset coefficient is used as the proportional coefficient; If the first difference is less than the first preset difference threshold, then the second preset coefficient is used as the proportional coefficient, wherein the first preset coefficient is greater than the second preset coefficient.

7. The method according to claim 5, characterized in that, The first force output device is an electric cylinder, the second force output device is a pneumatic cylinder, and determining the compensation coefficient of the electric proportional valve according to the proportional coefficient includes: Obtain the dimensional parameters of the electric cylinder and the pneumatic cylinder; The compensation coefficient is determined based on the size parameters of the electric cylinder, the size parameters of the pneumatic cylinder, and the proportional coefficient.

8. The method according to any one of claims 5-7, characterized in that, Determining the first output value of the electro-proportional valve based on the compensation coefficient includes: The first output value of the electro-proportional valve is determined based on the compensation coefficient, the current second output value of the electro-proportional valve, the pressure parameters of the second hot-pressed layer, and the pressure parameters of the target hot-pressed layer.

9. The method according to claim 2, characterized in that, Adjusting the output parameters of the target force output device in the hot pressing device according to the pressure parameters of the at least one hot pressing layer includes: Based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, the output parameters of the first force output device are adjusted.

10. The method according to claim 9, characterized in that, Based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, the output parameters of the first force output device are adjusted, including: If the second difference is less than the second preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the first stroke parameter, wherein the first stroke parameter is used to indicate that the output shaft moves in the first direction; If the second difference is greater than the third preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the second stroke parameter, wherein the second stroke parameter is used to indicate that the output shaft moves in a second direction, which is opposite to the first direction.

11. The method according to claim 10, characterized in that, The first stroke parameter includes: a first sub-stroke parameter and a second sub-stroke parameter. Adjusting the stroke parameter of the output shaft of the first force output device to the first stroke parameter includes: If the second difference is greater than or equal to the fourth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the first sub-stroke parameter; If the second difference is less than the fourth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the second sub-stroke parameter, wherein the distance indicated by the second sub-stroke parameter is greater than the distance indicated by the first sub-stroke parameter.

12. The method according to claim 10, characterized in that, The second stroke parameter includes: a third sub-stroke parameter and a fourth sub-stroke parameter. Adjusting the stroke parameter of the output shaft of the first force output device to the second stroke parameter includes: If the second difference is less than or equal to the fifth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the third sub-stroke parameter; If the second difference is greater than the fifth preset difference threshold, the stroke parameter of the output shaft of the first force output device is adjusted to the fourth sub-stroke parameter, wherein the distance indicated by the fourth sub-stroke parameter is greater than the distance indicated by the third sub-stroke parameter.

13. The method according to any one of claims 10-12, characterized in that, Based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, adjusting the output parameters of the first force output device further includes: If the second difference is greater than or equal to the second preset difference threshold and less than or equal to the third preset difference threshold, the output parameters of the first force output device are maintained.

14. A hot pressing device, characterized in that, The hot pressing device includes: The pressure parameter detection component located in each hot-pressing layer of the hot-pressing device is used to detect the pressure parameters of the hot-pressing layer; A controller connected to each of the pressure parameter detection components is used to acquire pressure parameters of at least one hot-pressing layer in the hot-pressing device, and adjust the pressure of at least one hot-pressing layer in the hot-pressing device according to the pressure parameters of the at least one hot-pressing layer; the hot-pressing layer includes a plurality of second hot-pressing layers; Each of the second hot-pressed layers is equipped with an electrical proportional valve connected to a second force output device, and the controller is specifically used for: Obtain the pressure parameters of each of the second hot-pressed layers; obtain the pressure parameters of the target hot-pressed layer; Based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, the first output value of the electro-proportional valve installed in the second hot-pressed layer is determined; wherein, the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers in which the battery cell is placed; The output pressure of the second force output device in the second hot-pressing layer is adjusted according to the first output value of the electro-proportional valve. The step of determining the first output value of the electro-proportional valve installed in the second hot-pressed layer based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer includes: After receiving the preset static compensation time of the gravity offset dynamic compensation command, and when the pressure parameter of the target hot-pressed layer is greater than the dynamic compensation start pressure parameter, the first output value of the electro-proportional valve set in the second hot-pressed layer is determined every preset dynamic compensation interval based on the first difference between the pressure parameter of the second hot-pressed layer and the pressure parameter of the target hot-pressed layer.

15. The hot pressing apparatus according to claim 14, characterized in that, The hot pressing device further includes a target force output device, wherein the controller is specifically used for: The output parameters of the target force output device are adjusted according to the pressure parameters of the at least one hot-pressed layer; wherein the target force output device is used to control the pressure of at least one of the hot-pressed layers.

16. The hot pressing apparatus according to claim 15, characterized in that, The target force output device includes: a first force output device located on the top of the first hot pressing layer of the hot pressing device, and / or a second force output device located on the second hot pressing layer not on the top of the hot pressing device. The first force output device is used to apply pressure in a first direction to each of the second hot pressing layers, and the second force output device is used to apply a supporting force in a second direction to the corresponding second hot pressing layer.

17. The hot pressing apparatus according to claim 16, characterized in that, The target force output device includes: a second force output device located on the second hot-pressing layer (not at the top) of the hot-pressing device, and the controller is specifically used for: For each of the second hot-pressed layers, the output parameters of the second force output device in the second hot-pressed layer are adjusted according to the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer, wherein the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers in which the battery cell is placed.

18. The hot pressing apparatus according to claim 15, characterized in that, The target force output device includes: a first force output device located on the first hot-pressing layer at the top of the hot-pressing device, and the controller is specifically used for: Based on the second difference between the pressure parameters of the target hot-pressed layer and the preset working pressure parameters, the output parameters of the first force output device are adjusted.

19. A pressure control device for a hot pressing apparatus, characterized in that, The pressure control device includes: The acquisition module is used to acquire the pressure parameters of at least one hot-pressing layer in the hot-pressing device; An adjustment module is used to adjust the pressure of at least one hot-pressing layer in the hot-pressing device according to the pressure parameters of the at least one hot-pressing layer; The hot-pressed layer includes multiple second hot-pressed layers; each of the second hot-pressed layers is provided with an electrical proportional valve connected to a second force output device in the second hot-pressed layer; The acquisition module is specifically used to acquire the pressure parameters of each of the second hot-pressed layers; and to acquire the pressure parameters of the target hot-pressed layer. The adjustment module includes: The first determining subunit determines the first output value of the electro-proportional valve installed in the second hot-pressed layer based on the first difference between the pressure parameters of the second hot-pressed layer and the pressure parameters of the target hot-pressed layer; wherein, the target hot-pressed layer is the highest hot-pressed layer in each of the second hot-pressed layers in which the battery cell is placed. The adjustment subunit adjusts the output pressure of the second force output device in the second hot-pressing layer according to the first output value of the electro-proportional valve. The first determining subunit is specifically used to determine the first output value of the electro-proportional valve set in the second hot-press layer according to the first difference between the pressure parameter of the second hot-press layer and the pressure parameter of the target hot-press layer after receiving the preset static compensation time of the gravity offset dynamic compensation instruction, and when the pressure parameter of the target hot-press layer is greater than the dynamic compensation start pressure parameter, at preset dynamic compensation intervals.

20. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1-13.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1-13.

22. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1-13.

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