Pressing method, controller and pressure system for electrolytic cell

Abstract

The invention provides a pressing method for an electrolytic cell, which comprises the following steps: after applying pressure to a galvanic pile in a cold pressing manner, monitoring a first pressing force attenuation value by adopting a strain monitoring element, and if the first pressing force attenuation value is within a first preset range, applying pressure to the galvanic pile in a hot pressing manner. Thus, through alternate cold and hot pressing, the sealing gasket can reach the maximum compression amount, the electrolytic bath is made to be in the optimal operation state, meanwhile, pressing adjustment can be conducted according to the pressing force attenuation value fed back by the strain detection element, and it is further guaranteed that the sealing gasket meets the sealing pressing stress requirement.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis, and in particular to a pressing method, a controller and a pressure system for an electrolytic cell. Background Art

[0002] In the alkaline water electrolysis hydrogen production industry, ambient temperature is an important factor affecting the compression of the gasket. When the ambient temperature is high, the gasket in the stack will be affected by thermal expansion and contraction, and it is easy to deform to a certain extent. Therefore, when operating the electrolyzer under high temperature and high pressure environment, attention should be paid to the change in the compression of its gasket. The elastic modulus of the gasket material usually decreases in a high temperature environment, resulting in an increase in the elastic deformation of the gasket, resulting in a larger compression; while a high pressure environment will cause the gasket to have a larger plastic deformation, which will also increase the compression.

[0003] The entire process of hydrogen production by electrolysis of water is the process of mutual conversion between chemical energy and electrical energy. This conversion process will increase the temperature of the electrolyte and cause thermal expansion and contraction. At this time, the safe and reliable operation of the electrolyzer is the primary key point that the industry attaches great importance to. If a pressurized alkaline electrolyzer leaks, very serious safety accidents may occur. Therefore, in order to ensure the long-term safe operation of the stack, the sealing safety of the electrolyzer stack has become a top priority for electrolyzer manufacturers. Summary of the invention

[0004] The object of the present invention is to provide a pressing method, a controller and a pressure system for an electrolytic cell, so as to improve the sealing safety of the electrolytic cell stack.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present application provides a compacting method for an electrolytic cell, the method being applied to the electrolytic cell, the electrolytic cell comprising a cell stack and a hydraulic press, the hydraulic press comprising an oil cylinder, a piston, a piston rod, a fixed end plate and a movable end plate, one end of the piston rod being connected to a piston located inside the oil cylinder, and the other end being connected to the movable end plate, the cell stack being located between the fixed end plate and the movable end plate, the electrolytic cell further comprising a monitoring device, the monitoring device comprising at least one strain monitoring element, the strain monitoring element being installed between the piston rod and the movable end plate, the method comprising:

[0006] Applying pressure to the battery stack by cold pressing;

[0007] Acquiring a first pressing force attenuation value monitored by the strain monitoring element;

[0008] If the first pressing force attenuation value exceeds a first preset range, returning to the step of applying pressure to the battery stack by cold pressing;

[0009] If the first pressing force attenuation value is within the first preset range, pressure is applied to the battery stack by means of hot pressing.

[0010] Optionally, after applying pressure to the battery stack by means of hot pressing, the method further includes:

[0011] Acquiring a second pressing force attenuation value monitored by the strain monitoring element;

[0012] If the second pressing force attenuation value exceeds a second preset range, returning to the step of applying pressure to the battery stack by means of hot pressing;

[0013] If the second pressing force attenuation value is within the second preset range, the process ends.

[0014] Optionally, applying pressure to the battery stack by cold pressing specifically includes:

[0015] Determine whether the current number of cold pressing times reaches a preset number, and if so, execute the step of obtaining the first pressing force attenuation value monitored by the strain monitoring element;

[0016] If the preset number of times is not reached, cold pressing is used to apply pressure to the battery stack at the currently set cold pressure value;

[0017] Obtaining a current deformation amount of the battery stack monitored by the strain monitoring element;

[0018] When the current deformation reaches a preset threshold, adjusting the set cold pressing value; the preset threshold is determined according to the current number of cold pressing times;

[0019] Return to the step of determining whether the current number of cold pressing times reaches the preset number.

[0020] Optionally, the monitoring device further includes a temperature monitoring element; and applying pressure to the battery stack by means of thermal pressing specifically includes:

[0021] heating the fuel cell stack;

[0022] Acquire a first battery stack temperature obtained by the temperature monitoring element monitoring the battery stack;

[0023] If the temperature of the first battery stack reaches a preset first temperature threshold, the temperature of the first battery stack is maintained within a preset time period; if the temperature of the first battery stack does not reach the preset first temperature threshold, the battery stack continues to be heated until it reaches the preset first temperature threshold;

[0024] After the preset time period, stopping the operation of maintaining the first stack temperature;

[0025] Acquire a second battery stack temperature obtained by the monitoring device monitoring the battery stack; the second battery stack temperature is less than the first battery stack temperature;

[0026] If the temperature of the first battery stack reaches a preset second temperature threshold, releasing the pressure of the battery stack; if the temperature of the first battery stack does not reach the preset second temperature threshold, continuing to wait until the temperature of the first battery stack reaches the preset second temperature threshold;

[0027] Pressure is reapplied to the stack.

[0028] In a second aspect, the present application provides a controller, which is applied to an electrolytic cell, wherein the electrolytic cell includes a stack and a hydraulic press, wherein the hydraulic press includes a cylinder, a piston, a piston rod, a fixed end plate and a movable end plate, wherein one end of the piston rod is connected to the piston located inside the cylinder, and the other end is connected to the movable end plate, the stack is located between the fixed end plate and the movable end plate, the electrolytic cell further includes a monitoring device, wherein the monitoring device includes at least one strain monitoring element, and the strain monitoring element is installed between the piston rod and the movable end plate, and the controller includes:

[0029] A pressure control module, used for applying pressure to the battery stack by cold pressing;

[0030] A monitoring control module, used for obtaining a first pressing force attenuation value monitored by the strain monitoring element;

[0031] The judgment control module is also used to return to the step of applying pressure to the battery stack by cold pressing if the first compression force attenuation value exceeds the first preset range; and to apply pressure to the battery stack by hot pressing if the first compression force attenuation value is within the first preset range.

[0032] Optionally, the monitoring and control module is further used for:

[0033] Acquiring a second pressing force attenuation value monitored by the strain monitoring element;

[0034] The judgment control module is also used to return to the step of applying pressure to the battery stack by hot pressing if the second pressing force attenuation value exceeds the second preset range; if the second pressing force attenuation value is within the second preset range, end the process.

[0035] Optionally, the judgment control module is specifically used to:

[0036] Determine whether the current number of cold pressing times reaches a preset number, and if so, execute the step of obtaining the first pressing force attenuation value monitored by the strain monitoring element; if not, apply pressure to the stack by cold pressing at the currently set cold pressure value;

[0037] The monitoring control module is specifically used to obtain the current deformation amount of the battery stack monitored by the strain monitoring element;

[0038] The judgment control module is specifically used to adjust the set cold pressing value when the current deformation reaches a preset threshold; the preset threshold is determined according to the current number of cold pressings; and return to the step of judging whether the current number of cold pressings reaches the preset number.

[0039] Optionally, the controller further includes a heating control module, and the heating control module is used to:

[0040] heating the fuel cell stack;

[0041] The monitoring control module is specifically used to obtain a first battery stack temperature obtained by the temperature monitoring element monitoring the battery stack;

[0042] The judgment control module is specifically used to, if the temperature of the first battery stack reaches a preset first temperature threshold, maintain the temperature of the first battery stack within a preset time period; if the temperature of the first battery stack does not reach the preset first temperature threshold, continue to heat the battery stack until it reaches the preset first temperature threshold; after the preset time period, stop maintaining the temperature of the first battery stack;

[0043] The monitoring control module is further specifically used to obtain a second battery stack temperature obtained by the monitoring device monitoring the battery stack; the second battery stack temperature is lower than the first battery stack temperature;

[0044] The judgment control module is also specifically used to release the pressure of the battery stack if the temperature of the first battery stack reaches a preset second temperature threshold; if the temperature of the first battery stack does not reach the preset second temperature threshold, continue to wait until the temperature of the first battery stack reaches the preset second temperature threshold; and re-apply pressure to the battery stack.

[0045] In a third aspect, the present application provides a pressure system, which is applied to a fuel cell stack. The pressure system includes a hydraulic press, which includes a cylinder, a piston, a piston rod, a fixed end plate and a movable end plate. One end of the piston rod is connected to the piston located inside the cylinder, and the other end is connected to the movable end plate. The fuel cell stack is located between the fixed end plate and the movable end plate. The pressure system also includes a monitoring device and a controller. The monitoring device includes at least one strain monitoring element, which is installed between the piston rod and the movable end plate. The hydraulic press is configured as follows:

[0046] Applying pressure to the battery stack by cold pressing;

[0047] The strain monitoring element is configured to obtain a monitored first pressing force attenuation value;

[0048] The controller is configured to determine whether the first pressing force attenuation value exceeds a first preset range, and if so, to send a command to the hydraulic press to return the execution of applying pressure to the battery stack by cold pressing; if within the first preset range, to send a command to the hydraulic press to apply pressure to the battery stack by hot pressing;

[0049] The hydraulic machine is also configured to receive and execute commands sent by the controller.

[0050] Optionally, the strain monitoring element is specifically configured as:

[0051] Obtaining the monitored second pressing force attenuation value;

[0052] The controller is specifically configured to determine whether the second pressing force attenuation value exceeds a second preset range, and if so, to send a command to the hydraulic press to return the command to apply pressure to the battery stack by hot pressing; if within the second preset range, to end the process;

[0053] The hydraulic press is also specifically configured to receive and execute commands sent by the controller.

[0054] Optionally, the controller is specifically configured as:

[0055] Determine whether the current number of cold pressing times reaches a preset number, and if so, send a command to the strain detection device to obtain the monitored first pressing force attenuation value; if not, send a command to the hydraulic press to apply pressure to the battery stack by cold pressing at the currently set cold pressure value;

[0056] The strain monitoring element is also specifically configured to obtain a current deformation amount obtained by monitoring the battery stack;

[0057] The controller is also specifically configured to determine whether the current deformation amount reaches a preset threshold value, and if so, adjust the set cold pressing value; the preset threshold value is determined based on the current number of cold pressings; if the preset threshold value is not reached, return to the step of determining whether the current number of cold pressings reaches the preset number.

[0058] Optionally, the monitoring device further includes a temperature monitoring element; and the controller is further configured to:

[0059] heating the fuel cell stack;

[0060] The monitoring device is further configured to obtain a first battery stack temperature obtained by monitoring the battery stack;

[0061] The controller is further configured to determine whether the temperature of the first battery stack reaches a preset first temperature threshold, and if so, maintain the temperature of the first battery stack within a preset time period; if not, continue to heat the battery stack until it reaches the preset first temperature threshold; and after the preset time period, stop maintaining the temperature of the first battery stack;

[0062] The monitoring device is further configured to obtain a second battery stack temperature obtained by monitoring the battery stack; the second battery stack temperature is less than the first battery stack temperature;

[0063] The controller is further configured to determine whether the temperature of the first battery stack reaches a preset second temperature threshold, and if so, send a command to the hydraulic press to release the pressure of the battery stack; if not, continue to wait until the temperature of the first battery stack reaches the preset second temperature threshold;

[0064] The hydraulic press is also configured to receive and execute commands sent by the controller and to re-apply pressure to the battery stack.

[0065] In a fourth aspect, the present application provides a terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described above when executing the computer program.

[0066] In a fifth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described above is implemented.

[0067] In this way, through alternating hot and cold compression, the sealing gasket can reach the maximum compression amount, so that the electrolytic cell is in the best operating state. At the same time, the compression can be adjusted according to the compression force attenuation value fed back by the strain detection element, further ensuring that the sealing gasket meets the sealing compression stress requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A schematic diagram of the structure of an electrolytic cell provided in an embodiment of the present application;

[0069] Figure 2 A schematic flow chart corresponding to a compacting method for an electrolytic cell provided in an embodiment of the present application;

[0070] Figure 3 A schematic flow chart corresponding to a cold pressing method for an electrolytic cell provided in an embodiment of the present application;

[0071] Figure 4 A schematic flow chart corresponding to a hot pressing method for an electrolytic cell provided in an embodiment of the present application.

[0072] The reference numerals are described as follows:

[0073] 10-battery stack; 20-hydraulic press; 21-cylinder; 22-piston rod; 23-fixed end plate; 24-movable end plate; 25-locking nut; 26-strain monitoring element. DETAILED DESCRIPTION

[0074] In order to make the purpose, advantages and features of the present invention more clear, the method proposed by the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0075] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0076] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0077] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0078] In the description of the present application specification and the appended claims, the terms “first”, “second”, etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

[0079] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0080] Figure 1 The schematic diagram of the structure of an electrolytic cell provided in an embodiment of the present application is exemplarily shown. The electrolytic cell includes a battery stack 10 and a hydraulic press 20. The hydraulic press 20 includes a cylinder 21 and a piston (inside the cylinder, Figure 1 ), a piston rod 22, a fixed end plate 23 and a movable end plate 24. One end of the piston rod 22 is connected to the piston located inside the cylinder 21, and the other end is connected to the movable end plate 24. The piston rod 22 can drive the movable end plate 24 to perform reciprocating motion. The fuel cell stack 10 is located between the fixed end plate 23 and the movable end plate 24.

[0081] The electrolytic cell may further include a locking nut 25 , which is used to fix the compression position of the hydraulic press 20 , specifically, to fix the position of the piston rod 22 , thereby fixing the position of the movable end plate 24 .

[0082] Furthermore, the electrolytic cell further comprises a monitoring device, which may include at least one strain monitoring element 26 , and the strain monitoring element may be installed between the piston rod 22 and the movable end plate 24 .

[0083] The strain monitoring element may be a strain gauge, or may be other strain sensors, which is not specifically limited in this application.

[0084] The monitoring device may also include at least one temperature monitoring element for monitoring the temperature of the fuel cell stack.

[0085] The temperature monitoring element may be a thermometer, or may be other temperature sensors, which is not specifically limited in this application.

[0086] based on Figure 1 The electrolytic cell shown, Figure 2As shown, it is a schematic flow chart corresponding to a compacting method for an electrolytic cell provided in an embodiment of the present application, which specifically includes the following steps:

[0087] Step 210, applying pressure to the battery stack by cold pressing.

[0088] Step 220: Acquire a first pressing force attenuation value monitored by the strain monitoring element.

[0089] Step 230 , determining whether the first pressing force attenuation value exceeds the first preset range. If the first pressing force attenuation value exceeds the first preset range, returning to step 210 ; otherwise, executing step 240 .

[0090] Step 240, applying pressure to the battery stack by means of hot pressing.

[0091] In this way, through alternating hot and cold compression, the sealing gasket can reach the maximum compression amount, so that the electrolytic cell is in the best operating state. At the same time, the compression can be adjusted according to the compression force attenuation value fed back by the strain detection element, further ensuring that the sealing gasket meets the sealing compression stress requirements.

[0092] Furthermore, after applying pressure to the battery stack by hot pressing, the method may further include the following steps:

[0093] Step 250: Acquire a second pressing force attenuation value monitored by the strain monitoring element.

[0094] Step 260, determining whether the second pressing force attenuation value exceeds the second preset range, if it exceeds the second preset range, returning to the above step 240; if it does not exceed the second preset range, ending the process.

[0095] Specifically, in step 210, during the process of applying pressure to the battery stack by cold pressing, the pressure may be applied multiple times. Figure 3 , is a flow chart corresponding to a cold pressing method for an electrolytic cell provided in an embodiment of the present application, which specifically includes the following steps:

[0096] Step 2101, determine whether the current cold pressing times have reached the preset times, if so, execute Figure 1 In step 220, if the preset number of times is not reached, execute step 2102.

[0097] Step 2102, using cold pressing to apply pressure to the fuel cell stack at the currently set cold pressure value.

[0098] Step 2103, obtaining the current deformation amount obtained by the strain monitoring element monitoring the fuel cell stack.

[0099] Step 2104, when the current deformation reaches the preset threshold, adjust the set cold pressure value and return to step 2101.

[0100] Among them, the preset threshold is determined according to the current number of cold pressings, that is, each cold pressing corresponds to a preset threshold of deformation, as shown in Table 1, which is a corresponding relationship table between the number of cold pressings and the preset threshold of deformation. In the first cold pressing, the preset threshold of deformation is set to L1, in the second cold pressing, the preset threshold of deformation is set to L2, in the third cold pressing, the preset threshold of deformation is set to L3, and in the fourth cold pressing, the preset threshold of deformation is set to L4.

[0101] Table 1: Correspondence between cold pressing times and preset thresholds of deformation

[0102] Cold pressing times Preset threshold of deformation 1st time L1 2nd L2 3rd L3 4th L4

[0103] When the current deformation reaches the preset threshold, the set cold pressure value is adjusted, that is, the cold pressure value of each cold pressing can be different. As shown in Table 2, it is a corresponding relationship table between the number of cold pressing times and the cold pressure value. During the first cold pressing, the cold pressure value is set to F1, during the second cold pressing, the cold pressure value is set to F2, during the third cold pressing, the cold pressure value is set to F3, and during the fourth cold pressing, the cold pressure value is set to F4.

[0104] Table 2: Correspondence between cold pressing times and preset thresholds of deformation

[0105] Cold pressing times Cold pressure value 1st time F1 2nd F2 3rd F3 4th F4

[0106] Furthermore, when the current deformation reaches a preset threshold, the set cold pressure value needs to be adjusted. There are multiple specific adjustment methods. In one example, the cold pressure value can be adjusted in an increasing manner, that is, F1<F2<F3<F4. In other examples, other methods can also be used to adjust the cold pressure value, which is not specifically limited.

[0107] In order to more clearly describe the cold pressing process, the following is a specific description in combination with Table 1 and Table 2. After the battery stack 10 is installed in place on the hydraulic press 20, the hydraulic press 20 can be set to apply pressure to cold-press the battery stack 10. The cold pressure value can be set to increase in a step-by-step manner, that is, the cold pressure value of the hydraulic press is set to F1 for the first time, and the preset threshold value of the deformation is set to L1. When the pressure applied by the hydraulic press 20 reaches the set value F1, this state can be maintained until the deformation reaches L1 to complete the first pressing. The pressure of the hydraulic press 20 is set to F2, F3 and F4 in turn, and the preset threshold values ​​of the deformation are set to L2, L3 and L4, to complete the second to fourth pressing processes respectively.

[0108] Furthermore, after the fourth compression, the first compression force attenuation value can be monitored by the strain monitoring element. If the first compression force attenuation value exceeds the first preset range, pressure can be applied to the battery stack again, such as repeating the fourth compression process, that is, setting the cold pressure value to F4, compressing the battery stack again, and continuously monitoring the first compression force attenuation value until the first compression force attenuation value meets the setting requirements, i.e., completing the cold pressing process.

[0109] It should be noted that if the first compression force attenuation value exceeds the first preset range, when pressure is applied to the battery stack again, the corresponding pressure value can also be set to other values, for example, it can be set to a value greater than F4. Technical personnel in this field can set it as needed, and this application does not limit it.

[0110] In the embodiment of the present application, the monitoring device may also include a temperature monitoring element, such as Figure 4 As shown, it is a schematic flow chart corresponding to a hot pressing method for an electrolytic cell provided in an embodiment of the present application. The above step 240 may specifically include the following steps:

[0111] Step 2401, heating the fuel cell stack.

[0112] Specifically, high-temperature pure water can be passed into the battery stack and circulated in the electrolyzer to achieve the effect of the battery stack.

[0113] Furthermore, the temperature of the high-temperature pure water may be set to be consistent with the preset first temperature threshold, or may be slightly higher than the preset first temperature threshold.

[0114] Step 2402, obtaining a first fuel cell stack temperature obtained by monitoring the fuel cell stack with a temperature monitoring element.

[0115] Step 2403, determine whether the temperature of the first fuel cell stack reaches a preset first temperature threshold. If it reaches the preset first temperature threshold, execute step 2404; otherwise, execute step 2405.

[0116] Step 2404: Maintain the first fuel cell stack temperature within a preset time period.

[0117] Step 2405, continue heating the fuel cell stack until a preset first temperature threshold is reached.

[0118] Step 2406, after a preset time period, stop maintaining the temperature of the first stack.

[0119] Step 2407, obtaining a second temperature of the fuel cell stack obtained by the monitoring device monitoring the fuel cell stack.

[0120] The second stack temperature is lower than the first stack temperature.

[0121] Step 2408 , determining whether the temperature of the first fuel cell stack reaches a preset second temperature threshold; if so, executing step 2409 ; otherwise, returning to step 2407 .

[0122] Step 2409, release the pressure of the battery stack.

[0123] Step 2410, re-apply pressure to the battery stack.

[0124] When pressure is reapplied to the battery stack, the applied pressure value can be consistent with the pressure value corresponding to the last cold pressing process.

[0125] In order to more clearly describe the cold pressing process, a specific description is given below with reference to an example. After the electrolytic cell is cold pressed, high-temperature pure water is passed into the battery stack 10 under mechanical locking state and circulated in the electrolytic cell. The first battery stack temperature obtained by monitoring the battery stack by the temperature monitoring element is obtained. If the first battery stack temperature reaches a preset first temperature threshold, the electrolytic cell is stabilized at the temperature for n hours and then naturally cooled to a second battery stack temperature. If the second battery stack temperature reaches a preset second temperature threshold, the mechanical lock of the hydraulic press 20 is unlocked, the pressure of the battery stack is released, and the pressing force is reapplied to the battery stack 10.

[0126] It should be noted that the above steps 2401 to 2410 may be repeated multiple times before executing step 250.

[0127] In the above steps 250 and 260, after the hydraulic press 20 presses the battery stack 10 and completes the mechanical locking, the pressing force of the electrolytic cell continues to decay in the absence of external interference factors (such as temperature and pressure), which can be monitored by a strain monitoring element. After multiple compressions, the decay rate gradually slows down. When the second pressing force attenuation value does not exceed the second preset range, the process can be terminated.

[0128] In addition, after the electrolytic cell completes the compaction process, an airtight leakage test can be completed at a pressure of P3 in accordance with GB / T 37562-2019 standard.

[0129] In the embodiment of the present application, after each compaction, the time required for this compaction can be recorded for reference by electrolytic cells of the same type as an operating standard.

[0130] Based on the same inventive concept, the present application provides a controller, which is applied to an electrolytic cell, wherein the electrolytic cell includes a cell stack and a hydraulic press, wherein the hydraulic press includes a cylinder, a piston, a piston rod, a fixed end plate and a movable end plate, wherein one end of the piston rod is connected to the piston located inside the cylinder, and the other end is connected to the movable end plate, the cell stack is located between the fixed end plate and the movable end plate, the electrolytic cell further includes a monitoring device, wherein the monitoring device includes at least one strain monitoring element, and the strain monitoring element is installed between the piston rod and the movable end plate, and the controller includes:

[0131] A pressure control module, used for applying pressure to the battery stack by cold pressing;

[0132] A monitoring control module, used for obtaining a first pressing force attenuation value monitored by the strain monitoring element;

[0133] The judgment control module is also used to return to the step of applying pressure to the battery stack by cold pressing if the first compression force attenuation value exceeds the first preset range; and to apply pressure to the battery stack by hot pressing if the first compression force attenuation value is within the first preset range.

[0134] Optionally, the monitoring and control module is further used for:

[0135] Acquiring a second pressing force attenuation value monitored by the strain monitoring element;

[0136] The judgment control module is also used to return to the step of applying pressure to the battery stack by hot pressing if the second pressing force attenuation value exceeds the second preset range; if the second pressing force attenuation value is within the second preset range, end the process.

[0137] Optionally, the judgment control module is specifically used to:

[0138] Determine whether the current number of cold pressing times reaches a preset number, and if so, execute the step of obtaining the first pressing force attenuation value monitored by the strain monitoring element; if not, apply pressure to the stack by cold pressing at the currently set cold pressure value;

[0139] The monitoring control module is specifically used to obtain the current deformation amount of the battery stack monitored by the strain monitoring element;

[0140] The judgment control module is specifically used to adjust the set cold pressing value when the current deformation reaches a preset threshold; the preset threshold is determined according to the current number of cold pressings; and return to the step of judging whether the current number of cold pressings reaches the preset number.

[0141] Optionally, the controller further includes a heating control module, and the heating control module is used to:

[0142] heating the fuel cell stack;

[0143] The monitoring control module is specifically used to obtain a first battery stack temperature obtained by the temperature monitoring element monitoring the battery stack;

[0144] The judgment control module is specifically used to, if the temperature of the first battery stack reaches a preset first temperature threshold, maintain the temperature of the first battery stack within a preset time period; if the temperature of the first battery stack does not reach the preset first temperature threshold, continue to heat the battery stack until it reaches the preset first temperature threshold; after the preset time period, stop maintaining the temperature of the first battery stack;

[0145] The monitoring control module is further specifically used to obtain a second battery stack temperature obtained by the monitoring device monitoring the battery stack; the second battery stack temperature is lower than the first battery stack temperature;

[0146] The judgment control module is also specifically used to release the pressure of the battery stack if the temperature of the first battery stack reaches a preset second temperature threshold; if the temperature of the first battery stack does not reach the preset second temperature threshold, continue to wait until the temperature of the first battery stack reaches the preset second temperature threshold; and re-apply pressure to the battery stack.

[0147] Based on the same inventive concept, the present application provides a pressure system, which is applied to a fuel cell stack. The pressure system includes a hydraulic press, which includes a cylinder, a piston, a piston rod, a fixed end plate and a movable end plate. One end of the piston rod is connected to the piston located inside the cylinder, and the other end is connected to the movable end plate. The fuel cell stack is located between the fixed end plate and the movable end plate. The pressure system also includes a monitoring device and a controller. The monitoring device includes at least one strain monitoring element, which is installed between the piston rod and the movable end plate. The hydraulic press is configured as follows:

[0148] Applying pressure to the battery stack by cold pressing;

[0149] The strain monitoring element is configured to obtain a monitored first pressing force attenuation value;

[0150] The controller is configured to determine whether the first pressing force attenuation value exceeds a first preset range, and if so, to send a command to the hydraulic press to return the execution of applying pressure to the battery stack by cold pressing; if within the first preset range, to send a command to the hydraulic press to apply pressure to the battery stack by hot pressing;

[0151] The hydraulic machine is also configured to receive and execute commands sent by the controller.

[0152] Optionally, the strain monitoring element is specifically configured as:

[0153] Obtaining the monitored second pressing force attenuation value;

[0154] The controller is specifically configured to determine whether the second pressing force attenuation value exceeds a second preset range, and if so, to send a command to the hydraulic press to return the command to apply pressure to the battery stack by hot pressing; if within the second preset range, to end the process;

[0155] The hydraulic press is also specifically configured to receive and execute commands sent by the controller.

[0156] Optionally, the controller is specifically configured as:

[0157] Determine whether the current number of cold pressing times reaches a preset number, and if so, send a command to the strain detection device to obtain the monitored first pressing force attenuation value; if not, send a command to the hydraulic press to apply pressure to the battery stack by cold pressing at the currently set cold pressure value;

[0158] The strain monitoring element is also specifically configured to obtain a current deformation amount obtained by monitoring the battery stack;

[0159] The controller is also specifically configured to determine whether the current deformation amount reaches a preset threshold value, and if so, adjust the set cold pressing value; the preset threshold value is determined based on the current number of cold pressings; if the preset threshold value is not reached, return to the step of determining whether the current number of cold pressings reaches the preset number.

[0160] Optionally, the monitoring device further includes a temperature monitoring element; and the controller is further configured to:

[0161] heating the fuel cell stack;

[0162] The monitoring device is further configured to obtain a first battery stack temperature obtained by monitoring the battery stack;

[0163] The controller is further configured to determine whether the temperature of the first battery stack reaches a preset first temperature threshold, and if so, maintain the temperature of the first battery stack within a preset time period; if not, continue to heat the battery stack until it reaches the preset first temperature threshold; and after the preset time period, stop maintaining the temperature of the first battery stack;

[0164] The monitoring device is further configured to obtain a second battery stack temperature obtained by monitoring the battery stack; the second battery stack temperature is less than the first battery stack temperature;

[0165] The controller is further configured to determine whether the temperature of the first battery stack reaches a preset second temperature threshold, and if so, send a command to the hydraulic press to release the pressure of the battery stack; if not, continue to wait until the temperature of the first battery stack reaches the preset second temperature threshold;

[0166] The hydraulic press is also configured to receive and execute commands sent by the controller and to re-apply pressure to the battery stack.

[0167] Based on the same inventive concept, the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described above when executing the computer program.

[0168] Based on the same inventive concept, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described above is implemented.

[0169] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A compacting method for an electrolytic cell, the method being applied to an electrolytic cell, the electrolytic cell comprising a cell stack and a hydraulic press, the hydraulic press comprising an oil cylinder, a piston, a piston rod, a fixed end plate and a movable end plate, one end of the piston rod being connected to the piston located inside the oil cylinder, and the other end being connected to the movable end plate, the cell stack being located between the fixed end plate and the movable end plate, characterized in that: The electrolytic cell further comprises a monitoring device, wherein the monitoring device comprises at least one strain monitoring element, wherein the strain monitoring element is installed between the piston rod and the movable end plate, and the method comprises: Applying pressure to the battery stack by cold pressing; Acquiring a first pressing force attenuation value monitored by the strain monitoring element; If the first pressing force attenuation value exceeds a first preset range, returning to the step of applying pressure to the battery stack by cold pressing; If the first pressing force attenuation value is within the first preset range, pressure is applied to the battery stack by means of hot pressing.

2. The method according to claim 1, characterized in that After applying pressure to the battery stack by means of hot pressing, the method further includes: Acquiring a second pressing force attenuation value monitored by the strain monitoring element; If the second pressing force attenuation value exceeds a second preset range, returning to the step of applying pressure to the battery stack by means of hot pressing; If the second pressing force attenuation value is within the second preset range, the process ends.

3. The method according to claim 1, characterized in that The step of applying pressure to the battery stack by cold pressing specifically includes: Determine whether the current number of cold pressing times reaches a preset number, and if so, execute the step of obtaining the first pressing force attenuation value monitored by the strain monitoring element; If the preset number of times is not reached, cold pressing is used to apply pressure to the stack at the currently set cold pressure value; Obtaining a current deformation amount of the battery stack monitored by the strain monitoring element; When the current deformation reaches a preset threshold, adjusting the set cold pressing value; the preset threshold is determined according to the current number of cold pressing times; Return to the step of determining whether the current number of cold pressing times reaches the preset number.

4. The method according to claim 1, characterized in that: The monitoring device further includes a temperature monitoring element; and applying pressure to the battery stack by means of thermal pressing specifically includes: heating the fuel cell stack; Acquire a first battery stack temperature obtained by the temperature monitoring element monitoring the battery stack; If the temperature of the first battery stack reaches a preset first temperature threshold, the temperature of the first battery stack is maintained within a preset time period; if the temperature of the first battery stack does not reach the preset first temperature threshold, the battery stack continues to be heated until it reaches the preset first temperature threshold; After the preset time period, stopping the operation of maintaining the first stack temperature; Acquire a second battery stack temperature obtained by the monitoring device monitoring the battery stack; the second battery stack temperature is less than the first battery stack temperature; If the temperature of the first battery stack reaches a preset second temperature threshold, releasing the pressure of the battery stack; if the temperature of the first battery stack does not reach the preset second temperature threshold, continuing to wait until the temperature of the first battery stack reaches the preset second temperature threshold; Pressure is reapplied to the stack.

5. A controller, the controller is applied to an electrolytic cell, the electrolytic cell includes a battery stack and a hydraulic press, the hydraulic press includes a cylinder, a piston, a piston rod, a fixed end plate and a movable end plate, one end of the piston rod is connected to the piston located inside the cylinder, and the other end is connected to the movable end plate, the battery stack is located between the fixed end plate and the movable end plate, characterized in that: The electrolytic cell further comprises a monitoring device, wherein the monitoring device comprises at least one strain monitoring element, wherein the strain monitoring element is installed between the piston rod and the movable end plate, and the controller comprises: A pressure control module, used for applying pressure to the battery stack by cold pressing; A monitoring control module, used for obtaining a first pressing force attenuation value monitored by the strain monitoring element; The judgment control module is also used to return to the step of applying pressure to the battery stack by cold pressing if the first compression force attenuation value exceeds the first preset range; and to apply pressure to the battery stack by hot pressing if the first compression force attenuation value is within the first preset range.

6. The controller according to claim 1, characterized in that: The monitoring control module is also used for: Acquiring a second pressing force attenuation value monitored by the strain monitoring element; The judgment control module is also used to return to the step of applying pressure to the battery stack by hot pressing if the second pressing force attenuation value exceeds the second preset range; if the second pressing force attenuation value is within the second preset range, end the process.

7. The controller according to claim 5, characterized in that: The judgment control module is specifically used for: Determine whether the current number of cold pressing times reaches a preset number, and if so, execute the step of obtaining the first pressing force attenuation value monitored by the strain monitoring element; if not, apply pressure to the stack by cold pressing at the currently set cold pressure value; The monitoring control module is specifically used to obtain the current deformation amount of the battery stack monitored by the strain monitoring element; The judgment control module is specifically used to adjust the set cold pressing value when the current deformation reaches a preset threshold; the preset threshold is determined according to the current number of cold pressings; and return to the step of judging whether the current number of cold pressings reaches the preset number.

8. The controller according to claim 5, characterized in that: The controller further comprises a heating control module, wherein the heating control module is used for: heating the fuel cell stack; The monitoring control module is specifically used to obtain a first battery stack temperature obtained by the temperature monitoring element monitoring the battery stack; The judgment control module is specifically used to, if the temperature of the first battery stack reaches a preset first temperature threshold, maintain the temperature of the first battery stack within a preset time period; if the temperature of the first battery stack does not reach the preset first temperature threshold, continue to heat the battery stack until it reaches the preset first temperature threshold; after the preset time period, stop maintaining the temperature of the first battery stack; The monitoring control module is further specifically used to obtain a second battery stack temperature obtained by the monitoring device monitoring the battery stack; the second battery stack temperature is lower than the first battery stack temperature; The judgment control module is also specifically used to release the pressure of the battery stack if the temperature of the first battery stack reaches a preset second temperature threshold; if the temperature of the first battery stack does not reach the preset second temperature threshold, continue to wait until the temperature of the first battery stack reaches the preset second temperature threshold; and re-apply pressure to the battery stack.

9. A pressure system, which is applied to a fuel cell stack, and which includes a hydraulic press, which includes a cylinder, a piston, a piston rod, a fixed end plate and a movable end plate, wherein one end of the piston rod is connected to the piston located inside the cylinder, and the other end is connected to the movable end plate, and the fuel cell stack is located between the fixed end plate and the movable end plate, and is characterized in that: The pressure system further comprises a monitoring device and a controller, wherein the monitoring device comprises at least one strain monitoring element installed between the piston rod and the movable end plate, and the hydraulic press is configured as follows: Applying pressure to the battery stack by cold pressing; The strain monitoring element is configured to obtain a monitored first pressing force attenuation value; The controller is configured to determine whether the first pressing force attenuation value exceeds a first preset range, and if so, to send a command to the hydraulic press to return the execution of applying pressure to the battery stack by cold pressing; if within the first preset range, to send a command to the hydraulic press to apply pressure to the battery stack by hot pressing; The hydraulic machine is also configured to receive and execute commands sent by the controller.

10. The system according to claim 9, characterized in that The strain monitoring element is specifically configured as follows: Obtaining the monitored second pressing force attenuation value; The controller is specifically configured to determine whether the second pressing force attenuation value exceeds a second preset range, and if so, to send a command to the hydraulic press to return the command to apply pressure to the battery stack by hot pressing; if within the second preset range, to end the process; The hydraulic press is also specifically configured to receive and execute commands sent by the controller.

11. The system according to claim 9, characterized in that The controller is specifically configured as follows: Determine whether the current number of cold pressing times reaches a preset number, and if so, send a command to the strain detection device to obtain the monitored first pressing force attenuation value; if not, send a command to the hydraulic press to apply pressure to the battery stack by cold pressing at the currently set cold pressure value; The strain monitoring element is also specifically configured to obtain a current deformation amount obtained by monitoring the battery stack; The controller is also specifically configured to determine whether the current deformation amount reaches a preset threshold value, and if so, adjust the set cold pressing value; the preset threshold value is determined based on the current number of cold pressings; if the preset threshold value is not reached, return to the step of determining whether the current number of cold pressings reaches the preset number.

12. The system according to claim 11, characterized in that The monitoring device further includes a temperature monitoring element; and the controller is further configured to: heating the fuel cell stack; The monitoring device is further configured to obtain a first battery stack temperature obtained by monitoring the battery stack; The controller is further configured to determine whether the temperature of the first battery stack reaches a preset first temperature threshold, and if so, maintain the temperature of the first battery stack within a preset time period; if not, continue to heat the battery stack until it reaches the preset first temperature threshold; After the preset time period, stopping the operation of maintaining the first stack temperature; The monitoring device is further configured to obtain a second battery stack temperature obtained by monitoring the battery stack; the second battery stack temperature is less than the first battery stack temperature; The controller is further configured to determine whether the temperature of the first battery stack reaches a preset second temperature threshold, and if so, send a command to the hydraulic press to release the pressure of the battery stack; if not, continue to wait until the temperature of the first battery stack reaches the preset second temperature threshold; The hydraulic press is also configured to receive and execute commands sent by the controller and to re-apply pressure to the battery stack.

13. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 4 is implemented.

14. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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