Electrochemical device electric pile
By setting a porous piston tube and movable airbag or leather case in the manifold of the electrochemical device stack, the problem of fixed function size of the electrochemical device stack is solved, and flexible adjustment of function size and improved application flexibility of the equipment is achieved.
Patent Information
- Application Number
- CN202420835838.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-22
AI Technical Summary
The functional size of existing electrochemical device stacks is fixed and difficult to adjust according to demand, especially when wind and light equipment generates power.
Selective operation and adjustment of the functional size of the electrochemical device are achieved by providing a porous piston tube in the manifold of the electrochemical device stack and a movable airbag or leather case.
It realizes flexible adjustment of the stack function of electrochemical devices, adapts to different electrical energy needs, and improves the application flexibility and efficiency of the equipment.
Smart Images
Figure CN222462956U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electrochemistry, and in particular relates to an electrochemical device stack. Background Art
[0002] The stack is composed of multiple single cells stacked in series, with bipolar plates and membrane electrodes alternately stacked, seals embedded between each cell, and tightened with screws after the front and rear plates are pressed together to form a stack. When the stack is working, liquid and / or gas are introduced from the inlet, distributed to the bipolar plates of each single cell through the main gas channel of the stack, and evenly distributed to the electrodes through the bipolar plate guide, and contact with the catalyst through the electrode support to carry out electrochemical reaction.
[0003] After an electrochemical device stack is equipped, its capacity is generally fixed. For example, after a megawatt electrolyzer is equipped, its function is at the megawatt level. However, the power generation of wind and solar equipment sometimes exceeds megawatts and sometimes is less than megawatts. When it exceeds megawatts, the power consumption can be reduced through circuit control, but when it is less than megawatts, the application of electrolyzers is limited. For another example, a megawatt-level liquid flow battery operates at the megawatt level when storing energy, but may not require megawatts during operation, assuming 50kW, that is, large-scale energy storage, which can gradually generate electricity when there is no continuous sunlight. Therefore, a technology is needed to adjust the functional size of electrochemical devices. Utility Model Content
[0004] In view of this, the technical problem to be solved by the present invention is to provide an electrochemical device stack with adjustable functional size.
[0005] The utility model provides an electrochemical device stack, which is an electrolyzer stack, a liquid flow battery stack or a fuel cell stack, comprising a plurality of electrochemical devices, a manifold and a porous piston tube; the plurality of electrochemical devices are connected through the manifold; the porous piston tube is arranged in the manifold; a movable airbag is arranged in the porous piston tube or the outer cover of the porous piston tube is provided with a leather cover.
[0006] Preferably, the manifold includes an inlet manifold and an outlet manifold; the porous piston tube includes a first porous piston tube and a second porous piston tube; the first porous piston tube is arranged in the inlet manifold; and the second porous piston tube is arranged in the outlet manifold.
[0007] Preferably, the inlet of the inlet manifold and the outlet of the outlet manifold are located on the same side of the electrochemical device stack; and the outer jacket of the porous piston tube is provided with a leather sheath.
[0008] Preferably, the inlet of the inlet manifold and the outlet of the outlet manifold are located on different sides of the electrochemical device stack; the outer cover of the first porous piston tube is provided with a leather cover; and a movable airbag is provided in the second porous piston tube.
[0009] Preferably, it also includes a sliding rod, which is connected to the movable airbag and can control the movable airbag to move in the porous piston tube through the sliding rod; or, the sliding rod is connected to the porous piston tube and can control the porous piston tube to move in the manifold through the sliding rod.
[0010] Preferably, it also includes an inflation device, which is connected to the movable airbag and can be used to inflate the movable airbag; or, the inflation device is connected to the porous piston tube and can be used to inflate the porous piston tube.
[0011] Preferably, the electrochemical device comprises a bipolar plate and a membrane electrode; the membrane electrode is located between the bipolar plates of two adjacent electrochemical devices.
[0012] Preferably, the bipolar plate includes an inlet zone, a first transition zone, a reaction zone, a second transition zone and an outlet zone which are connected in sequence; the reaction zone, the first transition zone and the second transition zone are all provided with flow channels; the number of flow channels in the reaction zone is greater than the number of flow channels in the first transition zone; the number of flow channels in the reaction zone is greater than the number of flow channels in the second transition zone; the reaction zone is in contact with the membrane electrode.
[0013] Preferably, the inlet area, the first transition area, the second transition area, the outlet area and the cross section of the flow channel are all provided with an anti-corrosion coating.
[0014] Preferably, the thickness of the anti-corrosion coating is less than or equal to 0.1 mm.
[0015] The utility model provides an electrochemical device stack, which is an electrolyzer stack, a flow battery stack or a fuel cell stack, and includes a plurality of electrochemical devices, a manifold and a porous piston tube; the plurality of electrochemical devices are connected through the manifold; the porous piston tube is arranged in the manifold; a movable airbag is arranged in the porous piston tube or a leather cover is arranged on the outer cover of the porous piston tube. Compared with the prior art, the electrochemical device stack provided by the utility model is provided with a porous piston tube in the manifold to adjust the functional size of the electrochemical device stack. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagram of the structure of the bipolar plate;
[0017] Figure 2 It is a schematic diagram of the structure of a circular electrode plate;
[0018] Figure 3 A schematic diagram of the design of an electrochemical device stack;
[0019] Figure 4 A schematic diagram of the functional size adjustment of the electrochemical device stack with fluid / gas entering and exiting on the same side (c-flow);
[0020] Figure 5 Schematic diagram of the functional size adjustment of the electrochemical device stack with fluid / gas entering and exiting from the opposite sides (Z-flow). DETAILED DESCRIPTION
[0021] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] The utility model also provides an electrochemical device stack, comprising a plurality of electrochemical devices, a manifold and a porous piston tube; the plurality of electrochemical devices are connected through the manifold; the porous piston tube is arranged in the manifold; a movable airbag is arranged in the porous piston tube or the outer cover of the porous piston tube is provided with a leather cover.
[0023] The electrochemical device stack provided by the utility model is an electrolyzer stack, a liquid flow battery stack or a fuel cell stack.
[0024] The electrochemical device stack provided by the utility model is formed by a plurality of electrochemical devices connected in series; the electrochemical device preferably comprises a bipolar plate and a membrane electrode; the membrane electrode is preferably located between the bipolar plates of two adjacent electrochemical devices, that is, one side of the bipolar plate serves as an anode plate of an electrochemical device, and the other side serves as a cathode plate of an adjacent electrochemical device.
[0025] In a specific embodiment provided by the utility model, the bipolar plate includes an inlet area, a first transition area, a reaction area, a second transition area and an outlet area which are connected in sequence; the reaction area, the first transition area and the second transition area are all provided with flow channels; the number of flow channels in the reaction area is greater than the number of flow channels in the first transition area; the number of flow channels in the reaction area is greater than the number of flow channels in the second transition area; the reaction area is in contact with the membrane electrode. The reactants are distributed in the first transition area and enter the reaction area, so that the reactants can be more evenly distributed in the reaction area, ensuring that the electrochemical reaction can be carried out evenly and fully in the reaction area; see Figure 1 , Figure 1 Schematic diagram of the structure of the bipolar plate.
[0026] In a specific embodiment provided by the utility model, the inlet zone, the first transition zone, the second transition zone, the outlet zone and the cross-section of the flow channel are all provided with an anti-corrosion coating; the anti-corrosion coating is formed by an anti-corrosion paint; further specifically, the surface of the outer frame of the reaction zone is provided with an anti-corrosion coating.
[0027] According to the utility model, further specifically, the anti-corrosion coating, especially the coating on the surface of the first transition zone and / or the second transition zone, preferably needs to be controlled below 0.1 mm, preferably below 0.05 mm, so as not to affect the fluid flow. At the same time, the length of the fluid flow in the transition zone must be much larger than the distance between the two plates. If the resistance between the two plates (membrane resistance) is 1 mΩ, the length of the transition zone is 1000 times the thickness of the membrane, and its resistance is about 1Ω. The voltage between the two plates is the same, such as 1.8V, then the current in the reaction area is 1000 times larger than that in the transition area (distribution area), so the short-circuit effect of the transition area (distribution area) is greatly reduced.
[0028] The utility model has no special restrictions on the shape of the bipolar plate, which can be rectangular, square, or circular; see Figure 2 , Figure 2 The schematic diagram of the circular plate structure. The cross section and outer frame of the flow channel area of the electrode plate need to be insulated. The purpose of this circular design is to maximize the ratio of the reaction area (or active area) to the area of the entire plate (60%~75%).
[0029] In the utility model, a plurality of electrochemical devices are connected through a manifold. Specifically, the manifold includes an inlet manifold and an outlet manifold; the porous piston tube includes a first porous piston tube and a second porous piston tube; the first porous piston tube is arranged in the inlet manifold; and the second porous piston tube is arranged in the outlet manifold.
[0030] According to the utility model, further specifically, the manifold includes an inlet manifold and an outlet manifold; the porous piston tube includes a first porous piston tube and a second porous piston tube; the first porous piston tube is arranged in the inlet manifold; the holes of the first porous piston tube are connected to the inlet of the electrochemical device; the second porous piston tube is arranged in the outlet manifold; the holes of the second porous piston tube are connected to the outlet of the electrochemical device.
[0031] According to the utility model, the electrochemical device stack can be divided into two modes, fluid / gas entering and exiting on the same side (c-flow) and entering and exiting on the opposite side (Z-flow), such as Figure 3 As shown, Figure 3 Schematic diagram of the design of the electrochemical device stack.
[0032] In a specific embodiment provided by the present invention, the inlet of the inlet manifold and the outlet of the outlet manifold are located on the same side of the electrochemical device stack; the outer shell of the porous piston tube is provided with a leather cover, and at this time, the two ends of the porous piston tube are preferably closed except for the inflation port, and the diameter of the porous piston tube is smaller than the distance between the inlet manifold and the outlet manifold, and when inflated, the leather cover bulges outward under the force to close the inlet manifold and the outlet manifold; when the electrochemical stack needs to work selectively, the porous piston tube can be moved to the manifold position corresponding to the electrochemical device that does not need to work, and then the porous piston tube is inflated to expand the leather cover to seal the manifold and the inlet and outlet of the electrochemical device at that position.
[0033] In a specific embodiment provided by the utility model, the inlet of the inlet manifold and the outlet of the outlet manifold are located on different sides of the electrochemical device stack; the outer cover of the first porous piston tube is provided with a leather cover; and a movable airbag is arranged in the second porous piston tube. When the movable airbag is arranged in the porous piston tube, the two ends of the porous piston tube are preferably open, and the holes of the porous piston tube are connected to the outlet of the electrochemical device; when the electrochemical stack needs to work selectively, the movable airbag in the porous piston tube can be moved to the manifold position corresponding to the electrochemical device that does not need to work, and then the movable airbag is inflated to expand the airbag to seal the holes in the part and the outlet of the electrochemical device.
[0034] According to the utility model, further specifically, it also includes a sliding rod, which is connected to the movable airbag, and the movable airbag can be controlled to move in the porous piston tube through the sliding rod; or the sliding rod is connected to the porous piston tube, and the porous piston tube is controlled to move in the manifold through the sliding rod.
[0035] According to the utility model, further specifically, it also includes an inflation device, which is connected to the movable airbag, and the movable airbag can be inflated through the inflation device; or, the inflation device is connected to the porous piston tube, and the porous piston tube can be inflated through the inflation device.
[0036] The utility model can realize the adjustment of the functional size of the electrochemical device stack by arranging a multi-hole piston tube in the manifold.
[0037] Specifically, the functional size adjustment diagram of the electrochemical device stack with fluid / gas entering and exiting on the same side (c-flow) is as follows Figure 4As shown, the adjustment device is performed by a piston tube, which is a porous piston tube, and the porous part is covered with a leather cover. Before ventilation, the piston is pushed into the manifold of the electrolyzer stack. For example, if batteries 5, 6, 7, and 8 do not work, the piston tube is pushed to battery 5, and then air or nitrogen is passed through the piston tube to expand like a leather cover, thereby sealing the battery parts 5, 6, 7, and 8. The fluid inlet and outlet parts are used simultaneously on the same side, so that only 1, 2, 3, and 4 work. The electrochemical device stack can be selectively operated by adjusting the piston tube.
[0038] Specifically, the schematic diagram of the function size adjustment of the electrochemical device stack with fluid / gas entering and exiting from the opposite side (Z-flow) is as follows Figure 5 As shown, the movable airbag at the outlet manifold is inflated to seal without hindering the flow of fluid. When the piston tube 2 is pushed to 4, batteries 1, 2, and 3 work, and the piston tube 1 needs to seal 4, 5, 6, 7, and 8. The movable airbag is moved back to position 4 and pushed into the battery stack. The inflated airbag makes the seals of 4, 5, 6, 7, and 8 synchronized with the piston tube 2. The piston tube part is porous and does not hinder the flow of fluid, so batteries 1, 2, and 3 can work normally. The presence of the porous tube makes the liquid distribution and flow uniform at the same time.
[0039] The electrochemical device stack provided by the utility model can be used to adjust the problem of electrolysis failure due to insufficient electricity. In particular, when the voltage of wind power and photovoltaic power drops, the piston tube can be adjusted to allow the electrolysis to continue working. The piston tube is non-conductive and cannot have a short circuit. Each bipolar plate can be a current collecting plate. The current and voltage detection (CVM) of the plate can be slidably connected. But the sliding rod is not conductive. For liquid flow batteries, charging during the day can be full-load charging, and the power generation can be adjusted when electricity is used at night. For example, a 100kW liquid flow battery is charged, but only 10 kW is used when needed. The piston tube can be adjusted to generate less power. At the same time, this design can be interchangeable at both ends, which plays a role in extending the life.
[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. An electrochemical device stack, wherein the electrochemical device stack is an electrolyzer stack, a flow battery stack or a fuel cell stack, characterized in that: It comprises a plurality of electrochemical devices, a manifold and a porous piston tube; the plurality of electrochemical devices are connected through the manifold; the porous piston tube is arranged in the manifold; a movable air bag is arranged in the porous piston tube or the outer cover of the porous piston tube is provided with a leather cover.
2. The electrochemical device stack according to claim 1, characterized in that: The manifold includes an inlet manifold and an outlet manifold; the porous piston tube includes a first porous piston tube and a second porous piston tube; the first porous piston tube is arranged in the inlet manifold; and the second porous piston tube is arranged in the outlet manifold.
3. The electrochemical device stack according to claim 2, characterized in that: The inlet of the inlet manifold and the outlet of the outlet manifold are located on the same side of the electrochemical device stack; the outer cover of the porous piston tube is provided with a leather cover.
4. The electrochemical device stack according to claim 2, characterized in that: The inlet of the inlet manifold and the outlet of the outlet manifold are located at different sides of the electrochemical device stack; the outer cover of the first porous piston tube is provided with a leather cover; and a movable airbag is arranged in the second porous piston tube.
5. The electrochemical device stack according to claim 1, characterized in that: It also includes a slide rod, which is connected to the movable airbag and can control the movable airbag to move in the porous piston tube through the slide rod; or, the slide rod is connected to the porous piston tube and can control the porous piston tube to move in the manifold through the slide rod.
6. The electrochemical device stack according to claim 1, characterized in that: It also includes an inflation device, which is connected to the movable airbag and can be used to inflate the movable airbag; or, the inflation device is connected to the porous piston tube and can be used to inflate the porous piston tube.
7. The electrochemical device stack according to claim 1, characterized in that: The electrochemical device comprises a bipolar plate and a membrane electrode; the membrane electrode is located between the bipolar plates of two adjacent electrochemical devices.
8. The electrochemical device stack according to claim 7, characterized in that: The bipolar plate includes an inlet area, a first transition area, a reaction area, a second transition area and an outlet area which are connected in sequence; the reaction area, the first transition area and the second transition area are all provided with flow channels; the number of flow channels in the reaction area is greater than the number of flow channels in the first transition area; the number of flow channels in the reaction area is greater than the number of flow channels in the second transition area; the reaction area is in contact with the membrane electrode.
9. The electrochemical device stack according to claim 8, characterized in that: The inlet area, the first transition area, the second transition area, the outlet area and the cross section of the flow channel are all provided with anti-corrosion coatings.
10. The electrochemical device stack according to claim 9, characterized in that: The thickness of the anti-corrosion coating is less than or equal to 0.1 mm.