Method, device and system for detecting working temperature of electrolytic cell

Abstract

The invention discloses a method, a device and a system for detecting the working temperature of an electrolytic bath, the electrolytic bath comprises a plurality of bipolar plates, and the method comprises the following steps: after applying alternating current signals to two bipolar plates positioned at two ends of a preset area, acquiring response electric signals of the two bipolar plates; acquiring a first total resistance of the preset area according to the response electric signal; the temperature of the preset area is obtained according to the first total resistance, the problem that heat loss is large due to the fact that an electrolyte flowing path is long can be solved, the problem that the resistance of a catalyst coating film is large and the resistance of a bipolar plate is small can be solved, and therefore the resistance of a conductive structure in the preset area can be accurately detected; therefore, the temperature of the preset area can be determined according to the first total resistance, the temperature of the preset area in the electrolytic bath can be accurately detected, the temperature of each area of the electrolytic bath can be detected, and the temperature of each area can be conveniently and accurately regulated and controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemistry, and in particular to a method, device and system for detecting the working temperature of an electrolytic cell. BACKGROUND

[0002] An electrolytic cell is a core component for producing hydrogen by electrolyzing water, and is a reaction device for producing hydrogen through an electrochemical reaction. Due to the electrochemical reaction characteristics, the reaction temperature has a significant impact on the hydrogen production performance of the electrolytic cell, and the two are in a proportional relationship. However, the durability of the high polymer separator (proton exchange membrane) in the electrolytic cell is inversely proportional to the temperature. Therefore, in order to balance the requirements of hydrogen production performance and service life of the electrolytic cell, high-precision monitoring of the internal temperature of the electrolytic cell is particularly important.

[0003] At present, the internal temperature of the electrolytic cell is mainly approximated by the outlet electrolyte temperature of the electrolytic cell. However, due to the hardware configuration, the temperature monitoring device is far away from the outlet of the electrolytic cell, and heat loss will occur on the electrolyte flow path. In addition, the thermal conductivity coefficient of the electrolyte is small, and the temperature changes slowly, so that the electrolyte temperature cannot accurately reflect the internal temperature change of the electrolytic cell, that is, the internal temperature of the electrolytic cell cannot be accurately controlled. SUMMARY

[0004] The present application provides a method, device and system for detecting the working temperature of an electrolytic cell to realize the detection of the internal temperature of the electrolytic cell.

[0005] According to an aspect of the present application, a method for detecting the working temperature of an electrolytic cell is provided, the electrolytic cell comprising a plurality of bipolar plates, the method comprising:

[0006] After applying an alternating current signal to two bipolar plates located at both ends of a preset region, obtaining the response electrical signals of the two bipolar plates;

[0007] According to the response electrical signals, obtaining the first total resistance of the preset region;

[0008] According to the first total resistance, obtaining the temperature of the preset region.

[0009] Optionally, according to the response electrical signals, obtaining the first total resistance of the preset region, comprises:

[0010] According to the response electrical signals, obtaining an impedance spectrum;

[0011] According to the impedance spectrum, obtaining the first total resistance of the preset region.

[0012] Optionally, the two bipolar plates at both ends of the preset region are a first bipolar plate and a second bipolar plate, and at least one diffusion layer and at least one catalyst coating film are arranged between the first bipolar plate and the second bipolar plate.

[0013] acquiring the temperature of the preset region according to the first total resistance, comprises:

[0014] acquiring the first volume resistance of each diffusion layer between the first bipolar plate and the second bipolar plate and the second volume resistance of each catalyst coated membrane;

[0015] acquiring each contact resistance existing between the first bipolar plate and the second bipolar plate;

[0016] acquiring the second total resistance of each bipolar plate in the preset region according to the first total resistance, each first volume resistance, each second volume resistance and each contact resistance;

[0017] determining the temperature of the preset region according to the second total resistance.

[0018] Optionally, determining the temperature of the preset region according to the second total resistance, comprises:

[0019] acquiring the number of the bipolar plates in the preset region;

[0020] determining the detection resistance of the xth bipolar plate in the preset region according to the second total resistance and the number of the bipolar plates in the preset region;

[0021] acquiring the resistivity of the xth bipolar plate according to the detection resistance;

[0022] determining the temperature of the preset region according to the resistivity;

[0023] wherein, x≥1 and x is an integer.

[0024] Optionally, the two bipolar plates at both ends of the preset region are respectively a first bipolar plate and a second bipolar plate, and at least one layer of catalyst coated membrane is arranged between the first bipolar plate and the second bipolar plate;

[0025] acquiring the temperature of the preset region according to the first total resistance, comprises:

[0026] acquiring the second volume resistance of each catalyst coated membrane between the first bipolar plate and the second bipolar plate;

[0027] acquiring each contact resistance existing between the first bipolar plate and the second bipolar plate;

[0028] acquiring the third total resistance of each bipolar plate in the preset region according to the first total resistance, each second volume resistance and each contact resistance;

[0029] determining the temperature of the preset region according to the third total resistance.

[0030] Optionally, determining the temperature of the preset region according to the third total resistance comprises:

[0031] Obtaining the number of bipolar plates in the preset region;

[0032] According to the third total resistance and the number of bipolar plates in the preset region, determining the detection resistance of the xth bipolar plate in the preset region;

[0033] According to the detection resistance, obtaining the resistivity of the xth bipolar plate;

[0034] According to the resistivity, determining the temperature of the preset region;

[0035] Wherein, x≥1 and x is an integer.

[0036] Optionally, the plurality of bipolar plates constitute at least two preset regions;

[0037] The method for detecting the working temperature of the electrolytic cell further comprises:

[0038] Obtaining the temperature of each of the preset regions;

[0039] According to the temperature of each of the preset regions, determining the working temperature of the electrolytic cell.

[0040] Optionally, determining the working temperature of the electrolytic cell according to the temperature of each of the preset regions comprises:

[0041] Obtaining an average temperature value of the temperature of each of the preset regions;

[0042] Determining the average temperature value as the working temperature of the electrolytic cell.

[0043] According to another aspect of the present application, there is provided a device for detecting the working temperature of an electrolytic cell, the electrolytic cell comprising a plurality of bipolar plates, the device for detecting the working temperature of the electrolytic cell comprising:

[0044] A response electrical signal obtaining module, configured to obtain a response electrical signal of two bipolar plates located at both ends of a preset region after an alternating current signal is applied to the two bipolar plates;

[0045] A first total resistance obtaining module, configured to obtain a first total resistance of the preset region according to the response electrical signal;

[0046] A first temperature obtaining module, configured to obtain the temperature of the preset region according to the first total resistance.

[0047] According to another aspect of the present application, there is provided a system for detecting the working temperature of an electrolytic cell, comprising: a controller and a power supply module;

[0048] The power module is used for applying an alternating current signal to two bipolar plates located at two ends of a preset area.

[0049] The controller is used for executing the detection method of the electrolytic cell working temperature.

[0050] In the embodiment of the present application, after the alternating current signal is applied to the two bipolar plates located at the two ends of the preset area, the response electric signals of the two bipolar plates are obtained, and then the first total resistance of the preset area can be obtained according to the response electric signals, so that the temperature of the preset area can be obtained according to the first total resistance. By applying the alternating current signal to the bipolar plates, the problem of large heat loss caused by the long electrolyte flow path can be reduced, and the problem of large resistance of the catalyst coating film and small resistance of the bipolar plate can be overcome, so that the resistance of the conductive structure in the preset area can be accurately detected, the temperature of the preset area in the electrolytic cell can be determined according to the first total resistance, the temperature of the preset area in the electrolytic cell can be accurately detected, and then the temperature of each area in the electrolytic cell can be detected, and the temperature of each area can be accurately controlled.

[0051] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0053] Figure 1 is a structural schematic diagram of an electrolytic cell provided by an embodiment of the present application;

[0054] Figure 2 is a flow chart of a detection method of an electrolytic cell working temperature provided by an embodiment of the present application;

[0055] Figure 3 is a flow chart of another detection method of an electrolytic cell working temperature provided by an embodiment of the present application;

[0056] Figure 4 is a flow chart of still another detection method of an electrolytic cell working temperature provided by an embodiment of the present application;

[0057] Figure 5 is a structural schematic diagram of an electrolytic cell working temperature detection device provided by an embodiment of the present application;

[0058] Figure 6 is a structural schematic view of another electrolytic cell working temperature detection device provided by the embodiment of the present application;

[0059] Figure 7 is a structural schematic view of another electrolytic cell working temperature detection device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0061] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0062] The embodiment of the present application provides a detection method for electrolytic cell working temperature, which can accurately detect the temperature of each region in the electrolytic cell. The detection method for electrolytic cell working temperature can be executed by the detection device for electrolytic cell working temperature provided by the embodiment of the present application. The detection device for electrolytic cell working temperature can be realized in the form of software and / or hardware, and the detection device for electrolytic cell working temperature can be configured in a controller.

[0063] Figure 1 is a structural schematic view of an electrolytic cell provided by the embodiment of the present application, as shown in Figure 1 The electrolytic cell includes a plurality of bipolar plates 1, and each bipolar plate 1 is arranged along the length direction S1 of the electrolytic cell. Two diffusion membranes 2 can be arranged between two adjacent bipolar plates 1, and the two diffusion membranes 2 are respectively attached to the two bipolar plates 1. The electrolytic cell can also include a catalyst coated membrane 3 located between the two diffusion membranes 2. Two end plates 4 can be arranged at both ends of the electrolytic cell along the length direction S1 of the electrolytic cell, for realizing the packaging of the electrolytic cell. In addition, an insulating plate 5 and a current collecting plate 6 can be sequentially arranged between the end plate 4 and the bipolar plate 1.

[0064] Figure 2 A flowchart of a method for detecting the working temperature of an electrolytic cell is provided for an embodiment of the present application, as shown in the figure, the method for detecting the working temperature of the electrolytic cell comprises: Figure 2

[0065] S110, after applying an alternating current signal to two bipolar plates located at both ends of a preset area, obtaining a response electrical signal of the two bipolar plates.

[0066] Specifically, when the temperature of a certain area of the electrolytic cell is to be obtained, the area can be determined as the preset area. It can be understood that the preset area includes at least two bipolar plates, so that two of them can be selected as two electrodes receiving the alternating current signal. In this embodiment, the alternating current signal is preferably applied to the two bipolar plates located at both ends of the preset area. Compared with setting a temperature monitoring device at the outlet of the electrolytic cell to detect the temperature of the electrolytic cell, the problem of inaccurate detection of the temperature of the electrolytic cell caused by heat loss due to the long flow path of the electrolyte can be effectively reduced, and the accuracy of the working temperature detection in the electrolytic cell can be effectively improved. The alternating current signal can be a small amplitude sine wave signal. Since two adjacent bipolar plates are provided with diffusion membranes attached to the two bipolar plates and catalyst coated membranes between the two diffusion membranes, and the catalyst coated membranes are usually made of high molecular materials, which have the characteristics of poor conductivity and large resistance, the two bipolar plates form a capacitor structure. By applying an alternating current signal to the bipolar plates, the problem of large resistance of the catalyst coated membrane and small resistance of the bipolar plate can be overcome, so that the resistance of the conductive structure (such as the bipolar plate) in the preset area can be accurately detected, i.e. the first total resistance.

[0067] S120, obtaining the first total resistance of the preset area according to the response electrical signal.

[0068] Specifically, the first total resistance can be obtained from the response electrical signal as the resistance of the preset area. The first total resistance can be obtained from the response electrical signal by electrochemical impedance spectroscopy (EIS), i.e. applying a small amplitude alternating current signal of different frequencies to the selected two bipolar plates, measuring the corresponding current (or potential) response generated by the system, and obtaining an impedance spectrum. The impedance spectrum reflects the relationship between the impedance of the electrochemical system and the frequency, and the first total resistance of the preset area can be determined from the obtained impedance spectrum.

[0069] For example, when the first total resistance of the preset area is obtained according to the response electrical signal, the impedance spectrum can be obtained from the response electrical signal first; and the first total resistance of the preset area can be obtained from the impedance spectrum.

[0070] ​Specifically, the impedance can be determined according to the impedance spectrum, and it can be understood that the impedance is a complex number, which can be expressed as two parts of a real part and an imaginary part. The imaginary part is the inductive reactance and capacitive reactance between the two bipolar plates, and the real part is the resistance between the bipolar plates. Therefore, the real part of the impedance can be obtained through the impedance spectrum, so that the first total resistance of the preset region can be obtained.

[0071] In S130, the temperature of the preset region is obtained according to the first total resistance.

[0072] Specifically, the bipolar plate is a metal material, and its resistance will change accordingly with the change of temperature. Therefore, after obtaining the first total resistance, the temperature of the preset region can be obtained according to the first total resistance. When the temperatures of multiple regions need to be detected, the above method can be used to detect the temperatures of each region of the electrolytic cell, so that the changes of the temperatures of each region of the electrolytic cell can be obtained, thereby facilitating accurate temperature control of each region.

[0073] In the embodiment, the multiple bipolar plates can constitute a preset region, and the reference Figure 1 When the electrolytic cell only includes one preset region A, the two bipolar plates at both ends of the preset region can be two bipolar plates 1 adjacent to the current collector plate 6 on both sides of the electrolytic cell. At this time, the temperature of the preset region can be taken as the working temperature of the entire electrolytic cell.

[0074] For example, the multiple bipolar plates can also constitute at least two preset regions. At this time, the method for detecting the working temperature of the electrolytic cell further includes: obtaining the temperature of each preset region; and determining the working temperature of the electrolytic cell according to the temperature of each preset region. That is, the temperature of each preset region is obtained, and when the working temperature of the entire electrolytic cell needs to be determined, the working temperature of the electrolytic cell can be determined by comprehensively considering the temperatures of each preset region. The working temperature of the electrolytic cell can be further determined while the temperatures of each region of the electrolytic cell are known, so that the reaction in the electrolytic cell can be controlled according to the temperatures of each region and the overall temperature.

[0075] For example, when the working temperature of the electrolytic cell is determined according to the temperature of each preset region, the average temperature value of the temperature of each preset region can be obtained, and the average temperature value is determined as the working temperature of the electrolytic cell. When the multiple bipolar plates can also constitute at least two preset regions, the adjacent two preset regions can partially overlap or not overlap with each other, and the embodiment of the present application does not make specific limitation thereto.

[0076] The method for detecting the working temperature of the electrolytic cell provided by the embodiment of the present application can obtain the first total resistance of the preset area according to the response electrical signal after the response electrical signal of the two bipolar plates is obtained after the alternating current signal is applied to the two bipolar plates located at the two ends of the preset area, so that the temperature of the preset area can be obtained according to the first total resistance. By applying the alternating current signal to the bipolar plate, the problem of large heat loss caused by the long electrolyte flow path can be reduced, and the problem of large resistance of the catalyst coating film and small resistance of the bipolar plate can be overcome, so that the resistance of the conductive structure in the preset area can be accurately detected, the temperature of the preset area can be determined according to the first total resistance, the temperature of the preset area in the electrolytic cell can be accurately detected, and then the temperature of each area of the electrolytic cell can be detected, and the temperature of each area can be accurately controlled.

[0077] Optionally, the two bipolar plates at the two ends of the preset area are a first bipolar plate and a second bipolar plate, and at least one diffusion layer and at least one catalyst coating film are arranged between the first bipolar plate and the second bipolar plate, Figure 3 is a flow chart of another method for detecting the working temperature of the electrolytic cell provided by the embodiment of the present application, as shown in Figure 3 The method for detecting the working temperature of the electrolytic cell comprises the following steps:

[0078] S210, after the alternating current signal is applied to the two bipolar plates located at the two ends of the preset area, the response electrical signal of the two bipolar plates is obtained.

[0079] S220, the impedance spectrum is obtained according to the response electrical signal.

[0080] S230, the first total resistance of the preset area is obtained according to the impedance spectrum.

[0081] S240, the first bulk resistance of each diffusion layer and the second bulk resistance of each catalyst coating film between the first bipolar plate and the second bipolar plate are obtained.

[0082] S250, each contact resistance existing between the first bipolar plate and the second bipolar plate is obtained.

[0083] Specifically, the first bulk resistance of each diffusion layer and the second bulk resistance of each catalyst coating film can be calibrated and stored in advance. In addition, each contact resistance existing between the two bipolar plates can be calibrated and stored in advance.

[0084] For example, refer to Figure 1Assuming the bipolar plates at both ends of the preset region A are a first bipolar plate 11 and a second bipolar plate 12, taking the first bipolar plate 11 and the second bipolar plate 12 as two adjacent bipolar plates 1, a first diffusion film 21, a first catalyst coating film 31, and a second diffusion film 22 are arranged sequentially between the first bipolar plate 11 and the second bipolar plate 12. Then, the first bulk resistance R11 of the first diffusion film 21 and the first bulk resistance R12 of the second diffusion film 22, as well as the second bulk resistance R31 of the first catalyst coating film 31, can be obtained. Additionally, the contact resistances R01 between the first bipolar plate 11 and the first diffusion film 21, R02 between the first diffusion film 21 and the first catalyst coating film 31, R03 between the first catalyst coating film 31 and the second diffusion film 22, and R04 between the second diffusion film 22 and the second bipolar plate 12 can be obtained. Each contact resistance can be calibrated under a preset encapsulation force. The preset encapsulation force can be the pressure applied to each component after the electrolytic cell is encapsulated, which can improve the accuracy of each contact resistance.

[0085] It should be noted that the diffusion layer is also a metallic material, but it is usually a mesh structure and relatively thin. Therefore, the resistance of the diffusion layer changes little with temperature, which is negligible compared to the resistance of the bipolar plate. Thus, the first bulk resistance of the diffusion layer can be calibrated and stored in advance.

[0086] S260. Based on the first total resistance, each first body resistance, each second body resistance, and each contact resistance, obtain the second total resistance of each bipolar plate within the preset area.

[0087] The second total resistance is the difference between the first total resistance and the resistances of each first body, each second body, and each contact resistance.

[0088] S270. Determine the temperature of the preset area based on the second total resistance.

[0089] Specifically, the sum of the resistances of each first body, each second body, and each contact resistance can be obtained first. Then, the difference between the first total resistance and the above sum can be obtained. The obtained difference is the second total resistance of each bipolar plate in the preset area, i.e., R2 = R1 - (R21 + R22 + R31 + R01 + R02 + R03 + R04), where R2 is the second total resistance and R1 is the first total resistance. Thus, the temperature of the preset area can be determined based on the second total resistance R2.

[0090] For example, when determining the temperature of a preset region based on the second total resistance, the number of bipolar plates in the preset region can be obtained first. Based on the second total resistance and the number of bipolar plates in the preset region, the detection resistance of the x-th bipolar plate in the preset region can be determined. The resistivity of the x-th bipolar plate can be obtained based on the detection resistance. Finally, the temperature of the preset region can be determined based on the resistivity. Where x ≥ 1 and x is an integer.

[0091] Specifically, the second total resistance can be divided by the number of bipolar plates in the preset area, and the average value obtained is taken as the detection resistance of one of the bipolar plates in the preset area. Then, the resistivity p of the bipolar plate can be calculated based on the first formula p = R * S / d, where R is the detection resistance, S is the contact area, the contact area S can be the surface area of the bipolar plate perpendicular to the first direction, assuming that the electrolytic tank is in the first direction along the length direction, and d is the thickness of the bipolar plate. After the resistivity p is calculated, the temperature T of the preset area can be calculated based on the second formula p = p0 * [1 + a * (T - T0)], where T0 is the reference temperature, which can be 0℃ or 20℃, p0 is the resistivity at the reference temperature T0, a is the temperature coefficient of the resistivity, and it is an experimental constant related to the material of the bipolar plate.

[0092] Optionally, Figure 4 is a flowchart of another electrolytic tank working temperature detection method provided by an embodiment of the present application, as shown in Figure 4 The electrolytic tank working temperature detection method comprises the following steps:

[0093] S310, after applying an alternating current signal to the two bipolar plates located at the two ends of the preset area, the response electrical signals of the two bipolar plates are obtained.

[0094] The two bipolar plates at the two ends of the preset area are respectively a first bipolar plate and a second bipolar plate, and at least one layer of catalyst coating film is arranged between the first bipolar plate and the second bipolar plate.

[0095] S320, the impedance spectrum is obtained according to the response electrical signals.

[0096] S330, the first total resistance of the preset area is obtained according to the impedance spectrum.

[0097] S340, the second bulk resistances of the catalyst coating films between the first bipolar plate and the second bipolar plate are obtained.

[0098] Specifically, since the material of the diffusion film can be the same metal material as the bipolar plate, and the diffusion film is arranged in close contact with the bipolar plate, the diffusion film can be regarded as a component part of the bipolar plate. At this time, only the second bulk resistances of the catalyst coating films can be calibrated and stored, and only the second bulk resistances of the catalyst coating films between the first bipolar plate and the second bipolar plate can be obtained when the temperature is detected.

[0099] S350, the contact resistances between the first bipolar plate and the second bipolar plate are obtained.

[0100] Specifically, when the diffusion membrane is regarded as a component of the bipolar plate, the contact resistance can only include the contact resistance between the diffusion membrane and the catalyst coated membrane, and in order to improve accuracy, the contact resistance between the bipolar plate and the diffusion membrane can also be included, and the embodiment of the present application does not make specific limitation to this. 222

[0101] 223S360, obtaining the third total resistance of each bipolar plate in the preset area according to the first total resistance, each second body resistance and each contact resistance. 224

[0102] 225The third total resistance is the difference between the first total resistance and each second body resistance and each contact resistance. 226

[0103] 227Specifically, the sum of each second body resistance and each contact resistance can be obtained first, and then the difference between the first total resistance and the sum is obtained, and the difference is taken as the third total resistance of each bipolar plate and each diffusion layer in the preset area. 228

[0104] 229S370, determining the temperature of the preset area according to the third total resistance. 230

[0105] 231Specifically, after the third total resistance is determined, the temperature of the preset area can be determined in the same manner as the above embodiment. 232

[0106] 233Specifically, the number of bipolar plates in the preset area can be obtained first, and then the detection resistance of the xth bipolar plate in the preset area is determined according to the third total resistance and the number of bipolar plates in the preset area, and the resistivity of the xth bipolar plate is obtained according to the detection resistance, and then the temperature of the preset area can be determined according to the resistivity. Wherein, x≥1 and x is an integer. 234

[0107] 235Based on the same inventive concept, the embodiment of the present application also provides an electrolytic cell working temperature detection device, which is used to execute the electrolytic cell working temperature detection method provided by any embodiment of the present application. The electrolytic cell working temperature detection device can be realized by software and / or hardware, so the electrolytic cell working temperature detection device provided by the embodiment of the present application includes the technical features of the electrolytic cell working temperature detection method provided by any embodiment of the present application, and can achieve the beneficial effects of the electrolytic cell working temperature detection method provided by any embodiment of the present application. The same parts can be referred to the above description of the electrolytic cell working temperature detection method provided by the embodiment of the present application, which will not be repeated here. 236

[0108] 237Optionally, Figure 5 238is a structural schematic diagram of an electrolytic cell working temperature detection device provided by the embodiment of the present application, like Figure 5 239As shown, the electrolytic tank working temperature detection device comprises: a response electric signal acquisition module 100, configured to acquire response electric signals of two bipolar plates after an alternating current signal is applied to the two bipolar plates located at two ends of a preset area; a first total resistance acquisition module 200, configured to acquire a first total resistance of the preset area according to the response electric signals; and a first temperature acquisition module 300, configured to acquire a temperature of the preset area according to the first total resistance.

[0109] For example, the first total resistance acquisition module comprises: an impedance spectrum acquisition unit, configured to acquire an impedance spectrum according to the response electric signals; and a first total resistance acquisition unit, configured to acquire the first total resistance of the preset area according to the impedance spectrum.

[0110] The electrolytic tank working temperature detection device provided by the embodiment of the present application can acquire the response electric signals of the two bipolar plates after the alternating current signal is applied to the two bipolar plates located at the two ends of the preset area through the response electric signal acquisition module, and then can acquire the first total resistance of the preset area according to the response electric signals through the first total resistance acquisition module, so as to acquire the temperature of the preset area according to the first total resistance through the first temperature acquisition module. By applying the alternating current signal to the bipolar plates, the problem of large heat loss caused by a long electrolyte flow path can be reduced, and the problem of large resistance of the catalyst coating film and small resistance of the bipolar plate can be overcome, so that the resistance of the conductive structure in the preset area can be accurately detected, the temperature of the preset area can be determined according to the first total resistance, the temperature of the preset area in the electrolytic tank can be accurately detected, and then the temperature of each area of the electrolytic tank can be detected, and the temperature of each area can be accurately controlled.

[0111] Optionally, as shown in Figure 1 , the two bipolar plates 1 at two ends of the preset area A are respectively a first bipolar plate AA and a second bipolar plate 12, and at least one diffusion layer 2 and at least one catalyst coating film 3 are arranged between the first bipolar plate 11 and the second bipolar plate 12. Figure 6 is a structural schematic diagram of another electrolytic tank working temperature detection device provided by the embodiment of the present application, as shown in Figure 6 , the first temperature acquisition module 300 comprises: a first bulk resistance acquisition unit 311, configured to acquire first bulk resistances of each diffusion layer between the first bipolar plate and the second bipolar plate and second bulk resistances of each catalyst coating film; a first contact resistance acquisition unit 312, configured to acquire each contact resistance existing between the first bipolar plate and the second bipolar plate; a second total resistance acquisition unit 313, configured to acquire a second total resistance of each bipolar plate in the preset area according to the first total resistance, each first bulk resistance, each second bulk resistance and each contact resistance; and a first temperature determination unit 314, configured to determine the temperature of the preset area according to the second total resistance.

[0112] Optionally, the first temperature determining unit comprises a first quantity obtaining subunit, configured to obtain the number of bipolar plates in the preset region; a first detection resistance determining subunit, configured to determine the detection resistance of the xth bipolar plate in the preset region according to the second total resistance and the number of bipolar plates in the preset region; a first resistivity obtaining subunit, configured to obtain the resistivity of the xth bipolar plate according to the detection resistance; and a first temperature obtaining subunit, configured to determine the temperature of the preset region according to the resistivity; wherein x is an integer greater than or equal to 1.

[0113] Optionally, the reference Figure 1 , the two bipolar plates 1 at the two ends of the preset region A are respectively a first bipolar plate 11 and a second bipolar plate 12, and at least one layer of catalyst coating film 3 is arranged between the first bipolar plate 11 and the second bipolar plate 12. Figure 7 is a structural schematic diagram of another electrolytic cell working temperature detection device provided by the embodiment of the application, as Figure 7 shown, the first temperature obtaining module 300 comprises: a second bulk resistance obtaining unit 321, configured to obtain the second bulk resistance of each catalyst coating film between the first bipolar plate and the second bipolar plate; a second contact resistance obtaining unit 322, configured to obtain each contact resistance existing between the first bipolar plate and the second bipolar plate; a third total resistance obtaining unit 323, configured to obtain the third total resistance of each bipolar plate in the preset region according to the first total resistance, each second bulk resistance and each contact resistance; and a second temperature determining unit 324, configured to determine the temperature of the preset region according to the third total resistance.

[0114] Optionally, the second temperature determining unit comprises a second quantity obtaining subunit, configured to obtain the number of bipolar plates in the preset region; a second detection resistance determining subunit, configured to determine the detection resistance of the xth bipolar plate in the preset region according to the third total resistance and the number of bipolar plates in the preset region; a second resistivity obtaining subunit, configured to obtain the resistivity of the xth bipolar plate according to the detection resistance; and a second temperature obtaining subunit, configured to determine the temperature of the preset region according to the resistivity; wherein x is an integer greater than or equal to 1.

[0115] Optionally, the plurality of bipolar plates constitute at least two preset regions; the electrolytic cell working temperature detection device further comprises a second temperature obtaining module, configured to obtain the temperature of each preset region; and a working temperature obtaining module, configured to determine the working temperature of the electrolytic cell according to the temperature of each preset region.

[0116] Optionally, the working temperature obtaining module comprises an average temperature value obtaining unit, configured to obtain an average temperature value of the temperature of each preset region; and a working temperature obtaining unit, configured to determine the average temperature value as the working temperature of the electrolytic cell.

[0117] Based on the same inventive concept, the embodiment of the present application also provides an electrolytic cell working temperature detection system, which comprises a controller and a power module, wherein the controller is used to execute the electrolytic cell working temperature detection method provided by any of the embodiments of the present application, thus the electrolytic cell working temperature detection system provided by the embodiment of the present application comprises the technical features of the electrolytic cell working temperature detection method provided by any of the embodiments of the present application, and can achieve the beneficial effects of the electrolytic cell working temperature detection method provided by any of the embodiments of the present application, and the same parts can refer to the description of the electrolytic cell working temperature detection method provided by the embodiment of the present application, which will not be repeated here.

[0118] For example, the power module can be electrically connected with only two bipolar plates located at two ends of the preset area, and used to apply an alternating current signal to the two bipolar plates located at the two ends of the preset area. In another possible embodiment, the power module can also be electrically connected with each bipolar plate, and when the alternating current signal is applied to the two bipolar plates located at the two ends of the preset area, two output ports corresponding to the two bipolar plates located at the two ends of the preset area can be determined through the port coding, so that the alternating current signal can be applied to the two bipolar plates located at the two ends of the preset area.

[0119] It should be understood that the steps shown above can be reordered, added or deleted. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0120] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting the operating temperature of an electrolytic cell, the electrolytic cell comprising multiple bipolar plates, characterized in that, Methods for detecting the operating temperature of an electrolytic cell include: After applying an AC signal to two bipolar plates located at both ends of a preset area, the response electrical signals of the two bipolar plates are acquired. The first total resistance of the preset region is obtained based on the response electrical signal; The temperature of the preset region is obtained based on the first total resistance.

2. The method for detecting the operating temperature of an electrolytic cell according to claim 1, characterized in that, Obtaining the first total resistance of the preset region based on the response electrical signal includes: Obtain the impedance spectrum based on the response electrical signal; The first total resistance of the preset region is obtained based on the impedance spectrum.

3. The method for detecting the operating temperature of an electrolytic cell according to claim 1, characterized in that, The two bipolar plates at both ends of the preset region are a first bipolar plate and a second bipolar plate, respectively. At least one diffusion layer and at least one catalyst coating film are disposed between the first bipolar plate and the second bipolar plate. Obtaining the temperature of the preset region based on the first total resistance includes: Obtain the first bulk resistance of each diffusion layer between the first bipolar plate and the second bipolar plate and the second bulk resistance of each catalyst coating film; Obtain the contact resistances between the first bipolar plate and the second bipolar plate; Based on the first total resistance, each of the first body resistances, each of the second body resistances, and each of the contact resistances, the second total resistance of each of the bipolar plates within the preset area is obtained; wherein, the second total resistance is the difference between the first total resistance and each of the first body resistances, each of the second body resistances, and each of the contact resistances; The temperature of the preset region is determined based on the second total resistance.

4. The method for detecting the operating temperature of an electrolytic cell according to claim 3, characterized in that, Determining the temperature of the preset region based on the second total resistance includes: Obtain the number of bipolar plates within the preset area; Based on the second total resistance and the number of bipolar plates in the preset area, determine the detection resistance of the xth bipolar plate in the preset area; The resistivity of the xth bipolar plate is obtained based on the detection resistor; The temperature of the preset region is determined based on the resistivity; Where x ≥ 1 and x is an integer.

5. The method for detecting the operating temperature of an electrolytic cell according to claim 1, characterized in that, The two bipolar plates at both ends of the preset region are the first bipolar plate and the second bipolar plate, respectively, and at least one catalyst coating film is provided between the first bipolar plate and the second bipolar plate. Obtaining the temperature of the preset region based on the first total resistance includes: Obtain the second bulk resistance of the catalyst coating film between the first bipolar plate and the second bipolar plate; Obtain the contact resistances between the first bipolar plate and the second bipolar plate; Based on the first total resistance, each of the second body resistances, and each of the contact resistances, the third total resistance of each of the bipolar plates within the preset area is obtained; wherein, the third total resistance is the difference between the first total resistance and each of the second body resistances and each of the contact resistances; The temperature of the preset region is determined based on the third total resistance.

6. The method for detecting the operating temperature of an electrolytic cell according to claim 5, characterized in that, Determining the temperature of the preset region based on the third total resistance includes: Obtain the number of bipolar plates within the preset area; Based on the third total resistance and the number of bipolar plates in the preset area, determine the detection resistance of the xth bipolar plate in the preset area; The resistivity of the xth bipolar plate is obtained based on the detection resistor; The temperature of the preset region is determined based on the resistivity; Where x ≥ 1 and x is an integer.

7. The method for detecting the operating temperature of an electrolytic cell according to claim 1, characterized in that, Multiple bipolar plates constitute at least two preset regions; The method for detecting the operating temperature of the electrolytic cell also includes: Obtain the temperature of each of the preset regions; The operating temperature of the electrolytic cell is determined based on the temperature of each of the preset regions.

8. The method for detecting the operating temperature of an electrolytic cell according to claim 1, characterized in that, Determining the operating temperature of the electrolytic cell based on the temperature of each of the preset zones includes: Obtain the average temperature value of each of the preset regions; The average temperature value is determined as the operating temperature of the electrolytic cell.

9. A device for detecting the operating temperature of an electrolytic cell, the electrolytic cell comprising a plurality of bipolar plates, characterized in that, The device for detecting the operating temperature of the electrolytic cell includes: The response electrical signal acquisition module is used to acquire the response electrical signals of the two bipolar plates after applying an AC signal to two bipolar plates located at both ends of a preset area. The first total resistance acquisition module is used to acquire the first total resistance of the preset area based on the response electrical signal. The first temperature acquisition module is used to acquire the temperature of the preset area based on the first total resistance.

10. A system for detecting the operating temperature of an electrolytic cell, characterized in that, include: Controller and power module; The power module is used to apply AC signals to two bipolar plates located at both ends of a preset area; The controller is used to perform the method for detecting the operating temperature of the electrolytic cell as described in any one of claims 1 to 8.

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