Controller, circulation pump, and fuel cell

Abstract

The utility model discloses a controller, a circulating pump and a fuel cell, the controller comprises a shell and a cable partition plate, the shell is provided with an accommodating space, and a low-voltage communication end is formed on the shell; the shell is provided with a containing space, the cable partition plate is a metal piece and is arranged in the containing space, a cable groove is defined between the cable partition plate and the shell, and a cable connected with the low-voltage communication port in the shell penetrates through the cable groove. According to the controller provided by the embodiment of the invention, the shielding protection of the low-voltage communication end is realized by arranging the cable partition plate, on one hand, the stability and reliability of the controller can be improved, and on the other hand, the electromagnetic shielding performance of the controller can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and in particular to a controller, a circulating pump, and a fuel cell. Background Technology

[0002] The controllers of circulating pumps often have mixed installations of strong and weak current circuits, as well as mixed installations of digital and logic circuits, leading to increasingly higher requirements for the electromagnetic compatibility performance of the controllers.

[0003] In related technologies, during the process of processing PCB boards into PCBAs, electromagnetic compatibility (EMC) performance is improved by selecting components such as filter capacitors and ferrite beads during the component selection stage, or by improving EMC performance through wiring design and separating digital / modal grounds during the circuit design stage. However, it is still difficult to meet the EMC performance requirements. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a controller with higher electromagnetic compatibility performance.

[0005] This application further proposes a circulating pump employing the aforementioned controller.

[0006] This application also proposes a fuel cell employing the aforementioned circulating pump.

[0007] In a first aspect, this application proposes a controller, comprising: a housing and a cable partition, the housing having an accommodating space and a low-voltage communication terminal formed thereon; the cable partition being constructed of a metal component, the cable partition being disposed within the accommodating space, and a cable groove being defined between the cable partition and the housing, wherein a cable connected to the low-voltage communication port passes through the cable groove within the housing.

[0008] According to the controller of the present application embodiment, by setting a cable partition, the low-voltage communication end is shielded and protected. On the one hand, the stability and reliability of the controller can be improved, and on the other hand, the electromagnetic shielding performance of the controller can be effectively improved.

[0009] According to some embodiments of this application, the cable partition includes: a first plate and a second plate located on both sides of the first plate and disposed opposite to each other, wherein the first plate is opposite to any plate of the housing, so that the first plate, the second plate, and the housing define the cable groove.

[0010] According to some embodiments of this application, the first plate and / or the second plate are provided with mounting ears, which are connected to the housing.

[0011] According to some embodiments of this application, the mounting ear is disposed at the bottom end of the second plate and connected to the bottom plate of the housing, and the first plate is opposite to the side plate of the housing.

[0012] According to some embodiments of this application, the housing is further provided with a connecting plate, the connecting plate is located at one end of the same side of the first plate and the second plate, the connecting plate is connected to the first plate and / or the second plate, and the connecting plate is constructed as a metal plate.

[0013] According to some embodiments of this application, a limiting groove is provided at one end of the first plate near the open end of the housing, the limiting groove being adapted to limit the cable extending into the cable groove.

[0014] According to some embodiments of this application, a DC input terminal and an AC output terminal are provided on one side plate of the housing, the low-voltage communication terminal is located on the other adjacent side plate, and the low-voltage communication terminal and the cable partition are both located adjacent to the DC input terminal.

[0015] According to some embodiments of this application, multiple functional boards are stacked inside the housing, one end of the cable is connected to the functional board, and the other end is connected to the low-voltage communication terminal, with the low-voltage communication terminal and the functional board located on both sides of the cable partition.

[0016] Secondly, this application discloses a circulating pump, including: a drive motor and a controller as described in the above embodiments, wherein the AC output terminal of the controller is electrically connected to the drive motor.

[0017] Thirdly, this application discloses a fuel cell, including: the circulation pump in the above embodiments, wherein the circulation pump is configured as a hydrogen circulation pump and is used to supply hydrogen to the fuel cell stack.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of a controller from one angle according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the controller according to an embodiment of this application from another angle;

[0022] Figure 3This is a schematic diagram of a circulating pump according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of a fuel cell according to an embodiment of this application.

[0024] Figure label:

[0025] Controller 100

[0026] Housing 10, low-voltage communication terminal 11, connecting plate 12, base plate 13, side plate 14, DC input terminal 15, AC output terminal 16.

[0027] Cable divider 20, first plate 21, second plate 22, mounting lug 23.

[0028] Function board 30,

[0029] Circulation pump 200, fuel cell stack 300, fuel cell 400, drive motor 500.

[0030] Accommodation space a, cable groove b, limiting groove c. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0033] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0039] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0040] In this application, "multiple" means two or more (including two).

[0041] A fuel cell is a highly efficient power generation device that directly converts the chemical energy of hydrogen and oxygen from the air into electrical energy through an electrochemical reaction without a combustion process. Fuel cells generate electricity sustainably, and the only byproduct is water, making them cleaner and more environmentally friendly. Compared to combustion-based technologies widely used in road vehicles, hydrogen fuel cells offer higher energy conversion efficiency and advantages such as lower noise and vibration.

[0042] A fuel cell consists of five main systems: the fuel cell stack, the air circulation system, the hydrogen supply system, the thermal management system, and the electronic control system. The hydrogen circulation pump is an important component of the hydrogen supply system. It pressurizes unreacted hydrogen and delivers it to the fuel cell stack inlet to reduce hydrogen consumption in the fuel cell system.

[0043] Hydrogen circulation pumps can be classified into three types based on the compressor: Roots type, vortex type, and centrifugal type. They use a drive motor as the driving unit, therefore, a controller is required. The controller's function is to modulate the DC power supplied by the system into AC power, thereby driving the drive motor (e.g., a permanent magnet synchronous motor), and to regulate the speed according to commands sent by the fuel cell control system.

[0044] With the development of hydrogen circulation pump technology, the electronic equipment of hydrogen circulation pump controllers is becoming increasingly complex. There are more and more instances of mixed installations of strong and weak current circuits and digital and logic circuits within the controllers. This presents new challenges to the electromagnetic compatibility (EMC) performance of the controllers. EMC refers to the ability of a device or system to function normally in its electromagnetic environment without causing unacceptable electromagnetic interference to anything in that environment. For electronic products, EMC performance is a crucial performance characteristic affecting the product's operational capability.

[0045] In the existing technology, the mainstream EMC design solutions are mainly: 1. When selecting components in the PCBA (Printed Circuit Board Assembly), use electrical components such as filter capacitors and ferrite beads to improve the product's EMC performance; 2. In the PCBA circuit design (layout) stage, improve the product's EMC performance through measures such as wiring design and separating digital / analog ground (i.e., separating digital ground and analog ground).

[0046] However, with increasingly faster data transmission rates within controllers, it is difficult to meet the electromagnetic compatibility performance requirements of controllers by using only the methods described above for EMC design.

[0047] Based on this, this application further proposes a controller that, by setting a cable partition inside the controller, achieves a shielding function, thereby reducing the influence of high-voltage electromagnetic signals on the low-voltage communication end and improving electromagnetic compatibility performance.

[0048] The following is for reference. Figures 1-4 The present invention describes a controller 100, a circulation pump 200, and a fuel cell 400 according to embodiments of the present invention.

[0049] like Figure 1 and Figure 2 As shown, in a first aspect, this application proposes a controller 100, including: a housing 10 and a cable partition 20. The housing 10 has an accommodating space a, and a low-voltage communication terminal 11 is formed on the housing 10. The cable partition 20 is constructed of metal and is disposed within the accommodating space a. A cable groove b is defined between the cable partition 20 and the housing 10, and a cable connected to the low-voltage communication terminal 11 passes through the cable groove b.

[0050] Specifically, the housing 10 can be any of a prismatic shell or a cylindrical shell. The housing 10 can include a shell body and a cover plate. At least one side of the shell body is open to define the accommodating space a, and the cover plate can be placed on the open end of the shell body to seal the accommodating space a and to protect the electrical components and cables in the accommodating space a.

[0051] The housing 10 has a low-voltage communication terminal 11, which serves as an interface for the controller 100 to perform data transmission and communication functions. Components such as the functional board 30 inside the housing 10 can be electrically connected to the low-voltage communication terminal 11 via cables. The low-voltage communication terminal 11 is also electrically connected to external devices such as the drive motor 500 and the fuel cell 400 control system.

[0052] Furthermore, a cable groove b is defined between the cable partition 20 and the housing 10, and the cable connecting the low-voltage communication terminal 11 can pass through the cable groove b. The shielding effect is defined by the cable partition 20 and the housing 10, so that the electromagnetic signals of the high-voltage end and the electromagnetic radiation inside the housing 10 can be coupled to the cable partition 20 and converted into current. The current is then grounded through the housing 10 to conduct the current to the ground, thereby reducing the influence of the high-voltage battery signal on the low-voltage communication terminal 11.

[0053] It is understandable that during the operation of the controller 100, high-voltage electromagnetic signals and electromagnetic radiation are generated inside the housing 10, and there is a certain probability that they will couple to the low-voltage communication terminal 11, affecting the communication of the controller 100 and reducing the working stability and reliability of the controller 100. However, by setting the cable partition 20, this application can reduce the interference and impact of high-voltage electromagnetic signals and electromagnetic radiation on the low-voltage communication terminal 11, thereby improving the reliability and stability of the controller 100 and also improving the electromagnetic compatibility performance of the controller 100.

[0054] It should be noted that the cable partition 20 in this embodiment can be implemented simultaneously with the EMC design scheme in the equipment selection stage and the EMC design scheme in the circuit design stage, and can further improve electromagnetic compatibility performance.

[0055] According to the embodiments of this application, the controller 100 provides shielding protection for the low-voltage communication terminal 11 by setting a cable partition 20. On the one hand, this can improve the stability and reliability of the controller 100, and on the other hand, it can effectively improve the electromagnetic shielding performance of the controller 100.

[0056] like Figure 2 As shown, according to some embodiments of this application, the cable partition 20 includes: a first plate 21 and a second plate 22 located on both sides of the first plate 21 and disposed opposite to each other. The first plate 21 is opposite to any plate of the housing 10 so that the first plate 21, the second plate 22, and the housing 10 define the cable groove b.

[0057] Specifically, the housing 10 may include a top plate, a bottom plate 13, and a side plate 14. The first plate 21 may be opposite to the bottom plate 13, the side plate 14, or the top plate. The second plate 22 is located on both sides of the first plate 21 to define a U-shaped structure through the first plate 21 and the second plate 22. The U-shaped structure may define a cable groove b with the bottom plate 13, the top plate, or the side plate 14 of the housing 10.

[0058] In this way, under the premise of achieving electromagnetic shielding of the low-voltage communication terminal 11, on the one hand, the cable tray b can be set to fit the housing 10, such as fitting the top plate, the bottom plate 13 or the side plate 14, which can improve the space occupation of the cable partition 20, so that the arrangement of each device in the accommodating space a is easier. On the other hand, the cable partition 20 has a simple structure and high reliability.

[0059] like Figure 2 As shown, according to some embodiments of this application, a mounting ear 23 is provided on the first plate 21 and / or the second plate 22, and the mounting ear 23 is connected to the housing 10.

[0060] For example, mounting ears 23 may be provided on the first plate 21, or on the second plate 22, or on both the first plate 21 and the second plate 22.

[0061] The mounting ear 23 is used to connect with the housing 10. For example, a first snap-fit ​​structure is formed on the mounting ear 23, and a second snap-fit ​​structure is formed on the housing 10 to cooperate with it, so as to realize the snap-fit ​​fixation of the cable partition 20 on the housing 10. The mounting ear 23 may also have a first insertion structure, and a second insertion structure is formed on the housing 10 to cooperate with it, so as to realize the insertion fixation of the cable partition 20 on the housing 10. Alternatively, a mounting hole may be provided on the mounting ear 23 so that the housing 10 and the cable partition 20 can be fastened by fasteners passing through the mounting hole.

[0062] Therefore, by setting the mounting ear 23 and connecting it to the housing 10, the stability and reliability of the cable partition 20 on the housing 10 can be improved, the probability of the cable partition 20 falling off can be reduced, and the electromagnetic shielding reliability and stability of the cable partition 20 can be further improved.

[0063] According to some embodiments of this application, the mounting ear 23 is disposed at the bottom end of the second plate 22 and connected to the bottom plate 13 of the housing 10, and the first plate 21 is opposite to the side plate 14 of the housing 10.

[0064] For example, the first plate 21 is opposite to one side plate 14 of the housing 10, and the two second plates 22 are opposite to the adjacent side plates 14 of the housing 10. The second plate 22 is provided with a mounting ear 23 near one end of the bottom plate 13 of the housing 10. One end of the mounting ear 23 is connected to the second plate 22, and the other end extends away from the second plate 22 and away from the cable groove b, so as to be connected to the bottom plate 13 of the housing 10 through the mounting ear 23.

[0065] In this way, on the one hand, the top of the cable tray b is open so that the cable connected to the low-voltage communication terminal 11 can be introduced or led out through the top of the cable tray b, that is, the top opening of the housing 10, making the cable assembly easier and more convenient. On the other hand, the mounting ear 23 is located outside the cable tray b and is used to connect with the housing 10, making the cable partition 20 easier to assemble as well.

[0066] like Figure 2 As shown, according to some embodiments of this application, a connecting plate 12 is also provided on the housing 10. The connecting plate 12 is located at one end of the same side of the first plate 21 and the second plate 22. The connecting plate 12 is connected to the first plate 21 and / or the second plate 22, and the connecting plate 12 is constructed as a metal plate.

[0067] Specifically, in the embodiment where the top plate of the housing 10 is connected to the cable partition 20, the connecting plate 12 is located on the top plate of the housing 10; in the embodiment where the bottom plate 13 of the housing 10 is connected to the cable partition 20, the connecting plate 12 is located on the bottom plate 13 of the housing 10; and in the embodiment where the side plate 14 of the housing 10 is connected to the cable partition 20, the connecting plate 12 is located on the side plate 14 of the housing 10. The connecting plate 12 can be connected to the first plate 21, the connecting plate 12 can be connected to the second plate 22, and the connecting plate 12 can be connected to both the first plate 21 and the second plate 22 simultaneously.

[0068] In this way, by setting the connecting plate 12 and making the connecting plate 12 a metal plate, on the one hand, the connection strength and reliability between the wire harness partition and the housing 10 can be improved; on the other hand, the metal plate can be used to seal one end of the wire harness partition, which can also improve the metal shielding effect of the cable tray b and improve the electromagnetic compatibility performance of the controller 100.

[0069] Combination Figure 1 and Figure 2 As shown, according to some embodiments of this application, a limiting groove c is provided at one end of the first plate 21 adjacent to the open end of the housing 10, and the limiting groove c is adapted to limit the cable extending into the cable groove.

[0070] Specifically, the cable extends into the cable groove b from one end (i.e., the open end), and the first plate 21 is provided with a limiting groove c near the open section. The limiting groove c can be constructed as a closed groove so that the cable can pass through the limiting groove c and then further enter the cable groove b. The limiting groove c can also be constructed as an open groove, where the cable bends and abuts against the limiting groove c.

[0071] Therefore, by setting the limiting groove c, not only can the cable be fixed, reducing the probability of cable movement and thus reducing the probability of poor connection between the cable and the low-voltage communication terminal 11, improving the reliability and stability of the low-voltage communication terminal 11, but the cable can also pass through the limiting groove c, so that after the cable is laid at the top of the cable partition 20, the height requirement is lower, making it easier to cover the plate and avoiding local bulges during the covering process.

[0072] exist Figure 1 and Figure 2 In the embodiments shown, according to some embodiments of this application, a DC input terminal 15 and an AC output terminal 16 are provided on one side plate 14 of the housing 10, and a low-voltage communication terminal 11 is located on the other adjacent side plate 14. The low-voltage communication terminal 11 and the cable partition 20 are both located near the DC input terminal 15.

[0073] In other words, this application places the low-voltage communication terminal 11 near the DC input terminal 15, and the cable partition 20 is further away from the AC output terminal 16, resulting in a lower probability of being affected by electromagnetic radiation coupling and higher stability and reliability.

[0074] like Figure 1 As shown, according to some embodiments of this application, multiple functional boards 30 are stacked inside the housing 10. One end of the cable is connected to the functional board 30, and the other end is connected to the low-voltage communication terminal 11. The low-voltage communication terminal 11 and the functional board 30 are located on both sides of the cable partition 20.

[0075] Specifically, the function board 30 can integrate a variety of modules, including power boards, control boards, etc. If some function boards 30 have communication requirements, they can be electrically connected to cables, which are further electrically connected to low-voltage communication terminals 11. The low-voltage communication terminals 11 can be wirelessly or wiredly connected to external devices to enable signal interaction between the controller 100 and external devices.

[0076] Secondly, this application discloses a circulating pump 200, including: a drive motor 500 and a controller 100 in the above embodiments, wherein the AC output terminal 16 of the controller 100 is electrically connected to the drive motor 500.

[0077] According to the circulating pump 200 of the present application embodiment, the AC output terminal 16 of the controller 100 is electrically connected to the drive motor 500 to drive the drive motor 500. The controller 100 has better electromagnetic compatibility performance and higher reliability, which can also improve the working stability and reliability of the circulating pump 200.

[0078] Thirdly, this application discloses a fuel cell 400, including: the circulation pump 200 in the above embodiments, wherein the circulation pump 200 is configured as a hydrogen circulation pump 200 and is used to supply hydrogen to the fuel cell stack 300 of the fuel cell 400.

[0079] The fuel cell 400 according to the embodiments of this application, by employing the hydrogen circulation pump 200 described above, can improve the reliability and stability of the fuel cell 400.

[0080] Other configurations and operations of the controller 100, circulation pump 200, and fuel cell 400 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A controller, characterized in that, include: A housing (10) having an accommodating space (a) and a low-voltage communication terminal (11) formed thereon; A cable partition (20) is constructed of metal. The cable partition (20) is disposed in the accommodating space (a), and a cable groove (b) is defined between the cable partition (20) and the housing (10). The cable connected to the low-voltage communication terminal (11) in the housing (10) passes through the cable groove (b).

2. The controller according to claim 1, characterized in that, The cable partition (20) includes a first plate (21) and a second plate (22) located on both sides of the first plate (21) and disposed opposite to each other. The first plate (21) is opposite to any plate of the housing (10) so that the first plate (21), the second plate (22) and the housing (10) define the cable groove (b).

3. The controller according to claim 2, characterized in that, The first plate (21) and / or the second plate (22) are provided with mounting ears (23), which are connected to the housing (10).

4. The controller according to claim 3, characterized in that, The mounting ear (23) is located at the bottom of the second plate (22) and is connected to the bottom plate (13) of the housing (10). The first plate (21) is opposite to the side plate (14) of the housing (10).

5. The controller according to claim 2, characterized in that, The housing (10) is also provided with a connecting plate (12), which is located at one end of the same side of the first plate (21) and the second plate (22). The connecting plate (12) is connected to the first plate (21) and / or the second plate (22), and the connecting plate (12) is constructed as a metal plate.

6. The controller according to claim 2, characterized in that, The first plate (21) is provided with a limiting groove (c) at one end near the open end of the housing (10), the limiting groove (c) being adapted to limit the cable extending into the cable groove (b).

7. The controller according to claim 1, characterized in that, A DC input terminal (15) and an AC output terminal (16) are provided on one side plate (14) of the housing (10). The low-voltage communication terminal (11) is located on the other adjacent side plate (14), and the low-voltage communication terminal (11) and the cable partition (20) are both located near the DC input terminal (15).

8. The controller according to any one of claims 1-7, characterized in that, The housing (10) contains stacked multi-layer functional boards (30). One end of the cable is connected to the functional board (30), and the other end is connected to the low-voltage communication terminal (11). The low-voltage communication terminal (11) and the functional board (30) are located on both sides of the cable partition (20).

9. A circulating pump, characterized in that, include: The drive motor (500) and the controller according to any one of claims 1-8, wherein the AC output terminal (16) of the controller is electrically connected to the drive motor (500).

10. A fuel cell, characterized in that, include: The circulation pump of claim 9, wherein the circulation pump is configured as a hydrogen circulation pump and is used to supply hydrogen to the stack of the fuel cell.

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