Membrane-free electrochemical energy storage device

Abstract

According to the membrane-free electrochemical energy storage device, in the thickness direction of a partition plate, a first energy storage device and a second energy storage device are arranged on the two sides of the partition plate correspondingly and connected with the partition plate; the first energy storage device comprises a first end plate, a first sealing gasket, a first current collector, a first gas diffusion electrode, a first porous membrane, a first auxiliary electrode, a second porous membrane, a first porous electrode, a second current collector and a second sealing gasket; the second energy storage device comprises a second end plate, a third sealing gasket, a third current collector, a second gas diffusion electrode, a third porous membrane, a second auxiliary electrode, a fourth porous membrane, a second porous electrode, a fourth current collector and a fourth sealing gasket; the metal strip is connected between the first auxiliary electrode and the second auxiliary electrode. Therefore, the membrane-free electrochemical energy storage device provided by the invention can perform short-term energy storage and can also perform long-term energy storage, and the energy storage effect and the energy storage cost can be both considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, in particular to a membrane-free electrochemical energy storage device. BACKGROUND

[0002] In the related art, some energy storage devices (such as lithium ion batteries) can only be used for short-term small-scale energy storage, and some energy storage devices (electrolytic cell-fuel cell) can be used for long-term large-scale energy storage, but the cost is extremely high, and the round-trip efficiency is low, which is not suitable for short-term energy storage. Therefore, there is an urgent need for an energy storage device that has both short-term and long-term energy storage effects to balance energy storage effect and energy storage cost. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to propose a membrane-free electrochemical energy storage device which has both short-term and long-term energy storage effects and has a lower energy storage cost.

[0004] The membrane-free electrochemical energy storage device according to the present application comprises: a first energy storage device, a second energy storage device and a separator, the first energy storage device and the second energy storage device are arranged on both sides of the separator along the thickness direction of the separator and are connected with the separator; from the first energy storage device away from the separator to the direction close to the separator, the first energy storage device comprises, in sequence: a first end plate, a first gasket, a first current collector, a first gas diffusion electrode, a first porous membrane, a first auxiliary electrode, a second porous membrane, a first porous electrode, a second current collector, a second gasket, the first energy storage device and the separator together define a first cavity; from the second energy storage device away from the separator to the direction close to the separator, the second energy storage device comprises, in sequence: a second end plate, a third gasket, a third current collector, a second gas diffusion electrode, a third porous membrane, a second auxiliary electrode, a fourth porous membrane, a second porous electrode, a fourth current collector, a fourth gasket, the second energy storage device and the separator together define a second cavity; the first end plate, the separator and the second end plate are connected; a metal strip connected between the first auxiliary electrode and the second auxiliary electrode.

[0005] The membrane-free electrochemical energy storage device according to the present application can perform both short-term and long-term energy storage, and can balance energy storage effect and energy storage cost.

[0006] In some examples of the present application, the first energy storage device further comprises: a first gasket and a second gasket, the first gasket is sleeved on the first gas diffusion electrode and is clamped between the first current collector and the first porous membrane, and the second gasket is sleeved on the first porous electrode and is clamped between the second porous membrane and the second current collector.

[0007] In some examples of the present application, the second energy storage device further comprises: a third sealing ring, a fourth sealing ring, the third sealing ring is sleeved on the second gas diffusion electrode and is clamped between the third current collector and the third porous membrane, and the fourth sealing ring is sleeved on the second porous electrode and is clamped between the fourth porous membrane and the fourth current collector.

[0008] In some examples of the present application, the metal strip is configured as a copper strip or a nickel strip.

[0009] In some examples of the present application, the first end plate has a first gas inlet interface and a first gas outlet interface; the first end plate has a first gas inlet opening and a first gas outlet opening open towards the separator, and the first gas inlet interface, the first gas inlet opening, the first gas outlet opening and the first gas outlet interface are sequentially communicated, or the first end plate has a first communication groove open towards the separator, and the first gas inlet interface, the first communication groove and the first gas outlet interface are sequentially communicated.

[0010] In some examples of the present application, the second end plate has a second gas inlet interface and a second gas outlet interface.

[0011] The second end plate has a second gas inlet opening and a second gas outlet opening open towards the separator, and the second gas inlet interface, the second gas inlet opening, the second gas outlet opening and the second gas outlet interface are sequentially communicated, or the second end plate has a second communication groove open towards the separator, and the second gas inlet interface, the second communication groove and the second gas outlet interface are sequentially communicated.

[0012] In some examples of the present application, the first current collector, the second current collector, the third current collector and the fourth current collector each have a flow channel, the first current collector has a first tab, the second current collector has a second tab, the third current collector has a third tab, and the fourth current collector has a fourth tab, and the first tab and the third tab are oppositely arranged along the thickness direction of the separator, and the second tab and the fourth tab are oppositely arranged along the thickness direction of the separator.

[0013] In some examples of the present application, the first gas diffusion electrode and the second gas diffusion electrode each comprise: a substrate layer, a microporous layer and a catalyst layer, the substrate layer is located between the corresponding microporous layer and the corresponding catalyst layer, and the catalyst layer is located on the side of the corresponding substrate layer towards the separator.

[0014] In some examples of the present application, the first auxiliary electrode and the second auxiliary electrode are redox mediators for each other.

[0015] In some examples of the present invention, the outer edge of the partition has a first liquid inlet and a first liquid outlet; the partition has a first liquid inlet and a first liquid outlet open toward the first end plate, and the first liquid inlet, the first liquid outlet, the first liquid outlet, and the first liquid outlet are connected in sequence; or, the partition has a third connecting groove open toward the first end plate, and the first liquid inlet, the third connecting groove, and the first liquid outlet are connected in sequence.

[0016] In some examples of the present invention, the outer edge of the partition has a second liquid inlet and a second liquid outlet; the partition has a second liquid inlet and a second liquid outlet open toward the second end plate, and the second liquid inlet, the second liquid outlet, the second liquid outlet and the second liquid outlet are connected in sequence; or, the partition has a fourth connecting groove open toward the second end plate, and the second liquid inlet, the fourth connecting groove and the second liquid outlet are connected in sequence.

[0017] In some examples of the present invention, the membrane-free electrochemical energy storage device further includes: a first liquid storage tank, a second liquid storage tank, a first multi-way valve, a second multi-way valve, a third multi-way valve, and a fourth multi-way valve. The first liquid storage tank is selectively connected to the first chamber and / or the second chamber through the first multi-way valve. The second liquid storage tank is selectively connected to the first chamber and / or the second chamber through the second multi-way valve. The first chamber is selectively connected to the first liquid storage tank and / or the second liquid storage tank through the third multi-way valve. The second chamber is selectively connected to the first liquid storage tank and / or the second liquid storage tank through the fourth multi-way valve.

[0018] In some examples of the present invention, the membrane-free electrochemical energy storage device further includes: a hydrogen storage tank and a fifth multi-way valve, wherein the hydrogen storage tank is selectively connected to the first chamber and / or the second chamber through the fifth multi-way valve;

[0019] And / or, the membrane-free electrochemical energy storage device further includes: a sixth multi-way valve through which oxygen is selectively connected to the first chamber and / or the second chamber.

[0020] Additional aspects and advantages of the 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

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of a membrane-free electrochemical energy storage device according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the membrane-free electrochemical energy storage device according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the first end plate and the second end plate according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the first end plate and the second end plate from another angle according to an embodiment of the present invention (one embodiment);

[0026] Figure 5 This is a schematic diagram of the first end plate and the second end plate from another angle according to an embodiment of the present invention (another embodiment);

[0027] Figure 6 This is a schematic diagram of the first sealing gasket and the third sealing gasket according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the partition according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the partition from another angle according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the partition at another angle according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the second and fourth sealing gaskets according to an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the first current collector and the second current collector according to an embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the third and fourth current collectors according to an embodiment of the present invention;

[0034] Figure 13 This is a schematic diagram of the first sealing ring and the third sealing ring according to an embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of the second and fourth sealing rings according to an embodiment of the present invention;

[0036] Figure 15 This is a diagram showing the piping structure of the membrane-free electrochemical energy storage device according to an embodiment of the present invention;

[0037] Figure 16This is a schematic diagram of the reaction principle of the membrane-free electrochemical energy storage device according to an embodiment of the present invention operating in Ni-H2 battery mode;

[0038] Figure 17 This is a schematic diagram of the piping architecture of the membrane-free electrochemical energy storage device according to an embodiment of the present invention, operating in Ni-H2 battery mode.

[0039] Figure 18 This is a schematic diagram of the reaction principle of the membrane-free electrochemical energy storage device according to an embodiment of the present invention operating in fuel cell mode;

[0040] Figure 19 This is a diagram of the piping architecture of the membrane-free electrochemical energy storage device according to an embodiment of the present invention, operating in fuel cell mode.

[0041] Figure 20 This is a schematic diagram of the reaction principle of the membrane-free electrochemical energy storage device according to an embodiment of the present invention operating in electrolytic cell mode;

[0042] Figure 21 This is a diagram of the piping architecture of the membrane-free electrochemical energy storage device according to an embodiment of the present invention, operating in electrolytic cell mode.

[0043] Figure label:

[0044] Membrane-free electrochemical energy storage device 100; First chamber 1; Second chamber 2; Partition 3; Metal strip 4;

[0045] First energy storage device 10; first end plate 11; first sealing gasket 12; first current collector 13; first sealing ring 14; first gas diffusion electrode 15; first porous membrane 16; first auxiliary electrode 17; second porous membrane 18; first porous electrode 19; second sealing ring 110; second current collector 111; second sealing gasket 112;

[0046] Second energy storage device 20; second end plate 21; third sealing gasket 22; third current collector 23; third sealing ring 24; second gas diffusion electrode 25; third porous membrane 26; second auxiliary electrode 27; fourth porous membrane 28; second porous electrode 29; fourth sealing ring 210; fourth current collector 211; fourth sealing gasket 212;

[0047] First electrode 131; Second electrode 1111; Third electrode 231; Fourth electrode 2111;

[0048] First air inlet 31; First air outlet 32; First air outlet 113; First air inlet 114; First connecting groove 33; First through hole 123; Second through hole 121;

[0049] Second air inlet 41; Second air outlet 42; Second air outlet 213; Second air inlet 214; Second connecting groove 43; Third through hole 223; Fourth through hole 221;

[0050] First liquid inlet 314; First liquid outlet 313; First liquid outlet 311; First liquid inlet 312; Third connecting groove 53; Fifth through hole 54; Sixth through hole 55;

[0051] Second liquid inlet 324; Second liquid outlet 323; Second liquid outlet 321; Second liquid inlet 322; Fourth connecting groove 63; Seventh through hole 64; Eighth through hole 65;

[0052] First liquid storage tank 411; second liquid storage tank 421; hydrogen storage tank 416; first peristaltic pump 412; second peristaltic pump 422; first multi-way valve 413; second multi-way valve 423; third multi-way valve 414; fourth multi-way valve 424; fifth multi-way valve 415; sixth multi-way valve 425. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] The following is for reference. Figures 1-21 A membrane-free electrochemical energy storage device 100 according to an embodiment of the present invention is described.

[0055] like Figures 1-21 As shown, the membrane-free electrochemical energy storage device 100 according to an embodiment of the present invention includes: a first energy storage device 10, a second energy storage device 20, a partition 3, and a metal strip 4.

[0056] Along the thickness direction of partition 3 (i.e. Figure 2(As shown in the X direction), the first energy storage device 10 and the second energy storage device 20 are respectively disposed on both sides of the partition 3 and are both connected to the partition 3; from the direction away from the partition 3 to the direction close to the partition 3, the first energy storage device 10 includes the following components stacked in sequence: a first end plate 11, a first sealing gasket 12, a first current collector 13, a first gas diffusion electrode 15, a first porous membrane 16, a first auxiliary electrode 17, a second porous membrane 18, a first porous electrode 19, a second current collector 111, and a second sealing gasket 112. The first energy storage device 10 and the partition 3 together define the first chamber 1; from the direction of the second end plate 20 to the direction of the partition 3, the first energy storage device 10 and the partition 3 define the first chamber 1; from the direction of the partition 3 to the direction of the partition 3, the first energy storage device 10 and the second energy storage device 20 ...20 to the direction of the partition 3, the first energy storage device 10 and the second energy storage device 20 define The energy storage device 20 extends from away from the partition 3 to closer to the partition 3. The second energy storage device 20 includes, in sequence, the following components stacked on top of each other: a second end plate 21, a third sealing gasket 22, a third current collector 23, a second gas diffusion electrode 25, a third porous membrane 26, a second auxiliary electrode 27, a fourth porous membrane 28, a second porous electrode 29, a fourth current collector 211, and a fourth sealing gasket 212. The second energy storage device 20 and the partition 3 together define the second chamber 2. The first end plate 11, the partition 3, and the second end plate 21 are connected and arranged. The metal strip 4 is connected between the first auxiliary electrode 17 and the second auxiliary electrode 27.

[0057] The first energy storage device 10 and the second energy storage device 20 are respectively disposed on both sides of the partition 3, and both the first energy storage device 10 and the second energy storage device 20 are connected to the partition 3. As some embodiments of this application, the first energy storage device 10 is connected to the partition 3 by bolts, and as some embodiments of this application, the second energy storage device 20 is connected to the partition 3 by bolts.

[0058] The first energy storage device 10 includes: a first end plate 11, a first sealing gasket 12, a first current collector 13, a first gas diffusion electrode 15, a first porous membrane 16, a first auxiliary electrode 17, a second porous membrane 18, a first porous electrode 19, a second current collector 111, and a second sealing gasket 112, along the thickness direction of the partition 3 (i.e., Figure 2 (As shown in the X direction), from the direction away from the partition 3 to the direction close to the partition 3, the first end plate 11, the first sealing gasket 12, the first current collector 13, the first gas diffusion electrode 15, the first porous membrane 16, the first auxiliary electrode 17, the second porous membrane 18, the first porous electrode 19, the second current collector 111, and the second sealing gasket 112 are stacked in sequence, and the first energy storage device 10 and the partition 3 together define the first chamber 1.

[0059] The second energy storage device 20 includes: a second end plate 21, a third sealing gasket 22, a third current collector 23, a second gas diffusion electrode 25, a third porous membrane 26, a second auxiliary electrode 27, a fourth porous membrane 28, a second porous electrode 29, a fourth current collector 211, and a fourth sealing gasket 212, along the thickness direction of the partition 3 (i.e., Figure 2(As shown in the X direction), from the direction away from the partition 3 to the direction close to the partition 3, the second end plate 21, the third sealing gasket 22, the third current collector 23, the second gas diffusion electrode 25, the third porous membrane 26, the second auxiliary electrode 27, the fourth porous membrane 28, the second porous electrode 29, the fourth current collector 211, and the fourth sealing gasket 212 are stacked in sequence, and the second energy storage device 20 and the partition 3 together define the second chamber 2.

[0060] The first end plate 11, partition 3, and second end plate 21 are connected, that is, the first end plate 11 is connected to the partition 3, and the second end plate 21 is connected to the partition 3. In some embodiments of this application, the first end plate 11 and partition 3 are connected by bolts, and the second end plate 21 and partition 3 are also connected by bolts, so that the first end plate 11 and second end plate 21 are connected. Alternatively, the first end plate 11, partition 3, and second end plate 21 are connected by bolts. In some embodiments of this application, the first end plate 11, partition 3, second end plate 21, first current collector 13, second current collector 111, third current collector 23, and fourth current collector 211 each have eight fixing screw holes, and bolts can mate with these eight fixing screw holes, so that the first end plate 11, partition 3, second end plate 21, first current collector 13, second current collector 111, third current collector 23, and fourth current collector 211 are connected by bolts.

[0061] The metal strip 4 is connected between the first auxiliary electrode 17 and the second auxiliary electrode 27 to transfer electrons. The metal strip 4 can be, but is not limited to, copper strip, nickel strip, etc. As some embodiments of this application, the metal strip 4 is a copper strip.

[0062] It should be explained that when short-term energy storage is required, the membrane-free electrochemical energy storage device 100 can operate in Ni-H2 battery mode, and the first chamber 1 and the second chamber 2 can form a Ni-H2 battery pack in series. The reaction equation is shown below:

[0063] Equation for the charging half-reaction:

[0064]

[0065] Discharge half-reaction equation:

[0066]

[0067] The first porous electrode 19 and the second porous electrode 29 operate when the membrane-free electrochemical energy storage device 100 is charged, and the first gas diffusion electrode 15 and the second gas diffusion electrode 25 operate when the membrane-free electrochemical energy storage device 100 is discharged.

[0068] As some embodiments of this application, such as Figure 16 andFigure 17 As shown, the membrane-free electrochemical energy storage device 100 operates in Ni-H2 battery mode. During charging, hydrogen evolution reaction (HER) occurs on both the first porous electrode 19 and the second porous electrode 29, producing H2 and OH. - The generated OH - NiOOH is generated by the reaction of the second porous membrane 18 with the redox medium Ni(OH)2 on the first auxiliary electrode 17. - NiOOH is generated by the reaction of the fourth porous membrane 28 with the redox medium Ni(OH)2 on the second auxiliary electrode 27, and the released H2 can enter the hydrogen storage tank 416 described below through a preset pipeline.

[0069] During the discharge process, such as Figure 16 and Figure 17 As shown, the redox medium NiOOH on the first auxiliary electrode 17 and the second auxiliary electrode 27 is reduced to Ni(OH)2 and OH. - OH in the first chamber 1 - It can pass through the first porous membrane 16 to the first gas diffusion electrode 15, and OH in the second chamber 2 - The H2 can pass through the third porous membrane 26 to the second gas diffusion electrode 25, while the H2 in the hydrogen storage tank 416 can enter the first chamber 1 and the second chamber 2 through the preset pipeline, and the H2 can react with OH on the first gas diffusion electrode 15 and the second gas diffusion electrode 25. - An oxidation reaction occurs to produce H2O.

[0070] It should be noted that in both the charging and discharging modes of the Ni-H2 battery, the electrolyte in the membrane-free electrochemical energy storage device 100 does not need to flow. The H2 flowing out from the first chamber 1 and the second chamber 2 can flow into the hydrogen storage tank 416 through a pre-set pipeline, and the hydrogen gas in the hydrogen storage tank 416 can flow into the first chamber 1 and the second chamber 2 through a pre-set pipeline.

[0071] When long-term energy storage is required, the membrane-free electrochemical energy storage device 100 can operate in electrolyzer or fuel cell mode, and can be charged and discharged separately. The first chamber 1 and the second chamber 2 serve as the anode or cathode, respectively, and the first auxiliary electrode 17 and the second auxiliary electrode 27 serve as redox media (e.g., Ni(OH)2 / NiOOH). The anode / cathode reaction is spatially decoupled, and the use of ion exchange membranes can be avoided.

[0072] The equation for the reaction is:

[0073]

[0074] As some embodiments of this application, such as Figure 18 andFigure 19 As shown, the membrane-free electrochemical energy storage device 100 can operate in fuel cell mode. During operation, H2 can be introduced into the first chamber 1 and O2 into the second chamber 2. At this time, the first gas diffusion electrode 15 undergoes a hydrogen oxidation reaction (HOR), and the second gas diffusion electrode 25 undergoes an oxygen reduction reaction (ORR). NiOOH on the first auxiliary electrode 17 is reduced to Ni(OH)2 and OH. - OH - The oxygen then undergoes a hydrogenation reaction (HOR) with H2 at the first gas diffusion electrode 15 to generate H2O, while the oxygen undergoes an oxygen reduction reaction (ORR) at the second gas diffusion electrode 25 to generate OH-. - OH - Then, Ni(OH)2 is oxidized to NiOOH by penetrating the third porous membrane 26 and the second auxiliary electrode 27.

[0075] When the redox medium is converted to the set value, the potential bias between the first chamber 1 and the second chamber 2 is exchanged. At this time, O2 can be introduced into the first chamber 1 and H2 into the second chamber 2. During this process, the first gas diffusion electrode 15 undergoes an oxygen reduction reaction (ORR), and the second gas diffusion electrode 25 undergoes a hydrogen oxidation reaction (HOR). NiOOH on the second auxiliary electrode 27 is reduced to Ni(OH)2 and OH-. - OH - The oxygen then undergoes a hydrogenation reaction (HOR) with H2 at the second gas diffusion electrode 25, passing through the third porous membrane 26 to generate H2O, while oxygen undergoes an oxygen reduction reaction (ORR) at the first gas diffusion electrode 15 to generate OH-. - OH - The first porous membrane 16 penetrates the first auxiliary electrode 17 to oxidize Ni(OH)2 into NiOOH. When the redox medium is converted to the set value, H2 is introduced into the first chamber 1 and O2 is introduced into the second chamber 2. This cycle is repeated to achieve the reverse reaction between the electrodes, thereby realizing the continuous operation of the membrane-free electrochemical energy storage device 100.

[0076] As some embodiments of this application, such as Figure 20 and Figure 21 As shown, the membrane-free electrochemical energy storage device 100 can operate in electrolytic cell mode, where a hydrogen evolution reaction (HER) occurs at the first porous electrode 19 to produce H2 and OH. - OH - The material penetrates the second porous membrane 18 and reacts with Ni(OH)2 on the first auxiliary electrode 17 to generate NiOOH. Simultaneously, the NiOOH on the second auxiliary electrode 27 is reduced to Ni(OH)2 and OH. - OH -O2 is generated by the oxygen evolution reaction (OER) that occurs at the second porous electrode 29 through the fourth porous membrane 28. The high-purity H2 generated by the hydrogen evolution reaction (HER) can enter the hydrogen storage tank 416 through a pipeline, while the O2 generated by the oxygen evolution reaction (OER) can be directly discharged into the environment, or it can be introduced into the oxygen storage tank described below through a pipeline.

[0077] When the redox medium is converted to a set value, the potential bias between the first chamber 1 and the second chamber 2 is exchanged, and a hydrogen evolution reaction (HER) occurs at the second porous electrode 29 to produce H2 and OH. - OH - The NiOOH is generated by the reaction of the fourth porous membrane 28 with Ni(OH)2 on the second auxiliary electrode 27. At the same time, the NiOOH on the first auxiliary electrode 17 is reduced to Ni(OH)2 and OH. - OH - O2 is generated by the oxygen evolution reaction (OER) that occurs at the first porous electrode 19 through the second porous membrane 18. When the redox medium is converted to a set value, the above cycle continues to achieve the reverse reaction between the electrodes, thereby realizing the continuous operation of the membrane-free electrochemical energy storage device 100.

[0078] As some embodiments of this application, the first porous membrane 16, the second porous membrane 18, the third porous membrane 26 and the fourth porous membrane 28 can be carboxylic acid- and sulfonic acid-modified alkaline membranes made by radiation grafting acrylic acid and sodium styrene sulfonate onto a polyolefin fiber substrate.

[0079] As some embodiments of this application, the first porous electrode 19 and the second porous electrode 29 may be loaded with, but are not limited to, bifunctional catalysts such as nickel foam, nickel mesh, stainless steel mesh, carbon cloth, copper foam, etc.

[0080] Therefore, by decoupling the scaling of power and capacity, the membrane-free electrochemical energy storage device 100 can perform both short-term and long-term energy storage, which can reduce energy storage costs and difficulties and improve energy storage efficiency.

[0081] In some embodiments of the present invention, such as Figure 13 and Figure 14 As shown, the first energy storage device 10 further includes: a first sealing ring 14 and a second sealing ring 110. The first sealing ring 14 is sleeved on the first gas diffusion electrode 15 and sandwiched between the first current collector 13 and the first porous membrane 16. The second sealing ring 110 is sleeved on the first porous electrode 19 and sandwiched between the second porous membrane 18 and the second current collector 111.

[0082] In this embodiment, the first sealing ring 14 is sleeved on the first gas diffusion electrode 15, and the second sealing ring 110 is sleeved on the first porous electrode 19. That is, the first sealing ring 14 is disposed around the first gas diffusion electrode 15, and the second sealing ring 110 is disposed around the first porous electrode 19. As some embodiments of this application, both the first sealing ring 14 and the second sealing ring 110 are constructed as hollow squares. The size of the hollow first sealing ring 14 is the same as the size of the first gas diffusion electrode 15, and the size of the hollow second sealing ring 110 is the same as the size of the first porous electrode 19. The first sealing ring 14 is sandwiched between the first current collector 13 and the first porous membrane 16, and the second sealing ring 110 is sandwiched between the second porous membrane 18 and the second current collector 111.

[0083] By sandwiching the first sealing ring 14 between the first current collector 13 and the first porous membrane 16, and sandwiching the second sealing ring 110 between the second porous membrane 18 and the second current collector 111, the probability of gas leakage and liquid leakage of the membrane-free electrochemical energy storage device 100 can be reduced. It can also seal the first gas diffusion electrode 15 and the first porous electrode 19. Furthermore, this arrangement can fix the first gas diffusion electrode 15 and the first porous electrode 19, which is beneficial to improving the reliability of the membrane-free electrochemical energy storage device 100.

[0084] In some embodiments of the present invention, such as Figure 13 and Figure 14 As shown, the second energy storage device 20 further includes: a third sealing ring 24 and a fourth sealing ring 210. The third sealing ring 24 is sleeved on the second gas diffusion electrode 25 and sandwiched between the third current collector 23 and the third porous membrane 26. The fourth sealing ring 210 is sleeved on the second porous electrode 29 and sandwiched between the fourth porous membrane 28 and the fourth current collector 211.

[0085] The third sealing ring 24 is sleeved on the second gas diffusion electrode 25, and the fourth sealing ring 210 is sleeved on the second porous electrode 29. That is, the third sealing ring 24 is disposed around the second gas diffusion electrode 25, and the fourth sealing ring 210 is disposed around the second porous electrode 29. As some embodiments of this application, the third sealing ring 24 and the fourth sealing ring 210 are both constructed as hollow squares. The size of the hollow third sealing ring 24 is the same as the size of the second gas diffusion electrode 25, and the size of the hollow fourth sealing ring 210 is the same as the size of the second porous electrode 29. The third sealing ring 24 is sandwiched between the third current collector 23 and the third porous membrane 26, and the fourth sealing ring 210 is sandwiched between the fourth porous membrane 28 and the fourth current collector 211.

[0086] By sandwiching the third sealing ring 24 between the third current collector 23 and the third porous membrane 26, and sandwiching the fourth sealing ring 210 between the fourth porous membrane 28 and the fourth current collector 211, the probability of gas leakage and liquid leakage in the membrane-free electrochemical energy storage device 100 can be reduced. This arrangement can also seal the second gas diffusion electrode 25 and the second porous electrode 29, and fix the second gas diffusion electrode 25 and the second porous electrode 29, which is beneficial to improving the reliability of the membrane-free electrochemical energy storage device 100.

[0087] In some embodiments of the present invention, the metal strip 4 is constructed as a copper strip or a nickel strip. As some embodiments of this application, the metal strip 4 is a copper strip. This configuration can improve the electron conduction rate, which is beneficial to improving the working efficiency of the membrane-free electrochemical energy storage device 100 and the reliability of the membrane-free electrochemical energy storage device 100.

[0088] In some embodiments of the present invention, such as Figures 3-5 As shown, the outer edge of the first end plate 11 has a first air inlet 31 and a first air outlet 32; the first end plate 11 has a first air inlet 114 and a first air outlet 113 that are open toward the partition 3, and the first air inlet 31, the first air inlet 114, the first air outlet 113 and the first air outlet 32 ​​are connected in sequence, or the first end plate 11 has a first connecting groove 33 that is open toward the partition 3, and the first air inlet 31, the first connecting groove 33 and the first air outlet 32 ​​are connected in sequence.

[0089] The outer edge of the first end plate 11 has a first air inlet 31 and a first air outlet 32. That is, the outer edge of the first end plate 11 has a first air inlet 31 and a first air outlet 32, which can be connected to a pipeline.

[0090] As some embodiments of this application, such as Figure 4 As shown, the first end plate 11 has a first air inlet 114 and a first air outlet 113 that open toward the partition 3. In other words, the first air inlet 114 and the first air outlet 113 are both open toward the first chamber 1. The first air inlet 31, the first air inlet 114, the first air outlet 113, and the first air outlet 32 ​​are sequentially connected so that gas can flow into the first chamber 1 through the first air inlet 31 and the first air inlet 114, and flow out of the first chamber 1 through the first air outlet 113 and the first air outlet 32.

[0091] As some embodiments of this application, such as Figure 5As shown, the first end plate 11 has a first connecting groove 33 that opens toward the partition 3. The first air inlet 31, the first connecting groove 33, and the first air outlet 32 ​​are connected in sequence so that gas can flow into the first chamber 1 through the first air inlet 31 and the first connecting groove 33, and flow out of the first chamber 1 through the first connecting groove 33 and the first air outlet 32.

[0092] As some embodiments of this application, such as Figure 6 As shown, the first sealing gasket 12 has a first through hole 123 and a second through hole 121. The first through hole 123 is correspondingly disposed and connected to the first air inlet 114. The second through hole 121 is correspondingly disposed and connected to the first air outlet 113. As some embodiments of this application, the first sealing gasket 12 has a first through hole 123 and a second through hole 121. Both the first through hole 123 and the second through hole 121 are connected to the first connecting groove 33. This arrangement can reduce the probability of gas leakage and is beneficial to improving the reliability of the membraneless electrochemical energy storage device 100.

[0093] This configuration allows gas to flow into or out of the first chamber 1, enabling gas exchange in the membrane-free electrochemical energy storage device 100. Furthermore, this configuration is simple and reliable, which helps improve the reliability of the membrane-free electrochemical energy storage device 100.

[0094] In some embodiments of the present invention, such as Figures 3-5 As shown, the outer edge of the second end plate 21 has a second air inlet 41 and a second air outlet 42; the second end plate 21 has a second air inlet 214 and a second air outlet 213 that are open toward the partition 3, and the second air inlet 41, the second air inlet 214, the second air outlet 213 and the second air outlet 42 are connected in sequence, or the second end plate 21 has a second connecting groove 43 that is open toward the partition 3, and the second air inlet 41, the second connecting groove 43 and the second air outlet 42 are connected in sequence.

[0095] The second end plate 21 has a second air inlet 41 and a second air outlet 42 on its outer edge. In other words, the outer edge of the second end plate 21 has a second air inlet 41 and a second air outlet 42, which can be connected to a pipeline.

[0096] As some embodiments of this application, such as Figure 4As shown, the second end plate 21 has a second air inlet 214 and a second air outlet 213 that are open toward the partition 3. In other words, the second air inlet 214 and the second air outlet 213 are both open toward the second chamber 2. The second air inlet 41, the second air inlet 214, the second air outlet 213 and the second air outlet 42 are sequentially connected so that gas can flow into the second chamber 2 through the second air inlet 41 and the second air inlet 214, and flow out of the second chamber 2 through the second air outlet 213 and the second air outlet 42.

[0097] As some embodiments of this application, such as Figure 5 As shown, the second end plate 21 has a second connecting groove 43 that opens toward the partition 3. The second air inlet 41, the second connecting groove 43, and the second air outlet 42 are connected in sequence so that gas can flow into the second chamber 2 through the second air inlet 41 and the second connecting groove 43, and flow out of the second chamber 2 through the second connecting groove 43 and the second air outlet 42.

[0098] As some embodiments of this application, such as Figure 6 As shown, the third sealing gasket 22 has a third through hole 223 and a fourth through hole 221. The third through hole 223 is correspondingly disposed and connected to the second air inlet 214. The fourth through hole 221 is correspondingly disposed and connected to the second air outlet 213. As some embodiments of this application, the third sealing gasket 22 has a third through hole 223 and a fourth through hole 221. Both the third through hole 223 and the fourth through hole 221 are connected to the second connecting groove 43. This arrangement can reduce the probability of gas leakage and improve the reliability of the membraneless electrochemical energy storage device 100.

[0099] This configuration allows gas to flow into or out of the second chamber 2, enabling gas exchange in the membrane-free electrochemical energy storage device 100. Furthermore, this configuration is simple and reliable, which helps improve the reliability of the membrane-free electrochemical energy storage device 100.

[0100] In some embodiments of the present invention, such as Figure 11 and Figure 12 As shown, the first current collector 13, the second current collector 111, the third current collector 23, and the fourth current collector 211 all have flow channels. The first current collector 13 has a first tab 131, the second current collector 111 has a second tab 1111, the third current collector 23 has a third tab 231, and the fourth current collector 211 has a fourth tab 2111, along the thickness direction of the partition 3 (i.e., Figure 2 (As shown in the X direction), the first electrode 131 and the third electrode 231 are positioned opposite each other, and the second electrode 1111 and the fourth electrode 2111 are positioned opposite each other.

[0101] The materials of the first current collector 13, the second current collector 111, the third current collector 23, and the fourth current collector 211 can be, but are not limited to, graphite plates, titanium plates, etc. As some embodiments of this application, the first current collector 13, the second current collector 111, the third current collector 23, and the fourth current collector 211 are all constructed as graphite plates.

[0102] The first current collector 13, the second current collector 111, the third current collector 23, and the fourth current collector 211 all have flow channels. Specifically, the flow channel is constructed in a snake-like shape to provide a channel for the flow of electrolyte in the membrane-free electrochemical energy storage device 100.

[0103] Along the thickness direction of partition 3 (i.e. Figure 2 (As shown in the X direction), the first electrode 131 and the third electrode 231 are positioned opposite each other, and the second electrode 1111 and the fourth electrode 2111 are positioned opposite each other. That is to say, the first current collector 13 and the third current collector 23 are opposite each other and symmetrical about the partition 3, and the second current collector 111 and the fourth current collector 211 are opposite each other and symmetrical about the partition 3.

[0104] This design allows the membraneless electrochemical energy storage device 100 to be rationally designed, and enables the electrolyte to flow smoothly in the membraneless electrochemical energy storage device 100, which is beneficial to improving the reliability of the membraneless electrochemical energy storage device 100.

[0105] In some embodiments of the present invention, the first gas diffusion electrode 15 and the second gas diffusion electrode 25 each include: a substrate layer, a microporous layer, and a catalyst layer, wherein the substrate layer is located between the corresponding microporous layer and the corresponding catalyst layer, and the catalyst layer is located on the side of the corresponding substrate layer facing the partition 3.

[0106] That is to say, along the thickness direction of partition 3 (i.e. Figure 2 (in the X direction shown), the base layer of the first gas diffusion electrode 15 is located between the corresponding microporous layer and the corresponding catalyst layer, the base layer of the second gas diffusion electrode 25 is located between the corresponding microporous layer and the corresponding catalyst layer, and the catalyst layer of the first gas diffusion electrode 15 is located on the side of the base layer facing the partition 3, and the catalyst layer of the second gas diffusion electrode 25 is located on the side of the base layer facing the partition 3.

[0107] It should be noted that the substrate layer mainly serves to support the microporous layer and the catalyst layer; the microporous layer can reduce the contact resistance between the catalyst layer and the substrate layer, allowing gas and water to redistribute and preventing the electrode catalyst layer from being "flooded"; at the same time, the microporous layer can prevent the catalyst layer from penetrating into the substrate layer during the preparation process; the catalyst layer has dual functional reactive activities of hydrogen oxidase (HOR) and oxygen reduction (ORR).

[0108] This configuration allows for the rational design of the first gas diffusion electrode 15 and the second gas diffusion electrode 25, enabling them to maintain stable operation.

[0109] In some embodiments of the present invention, the first auxiliary electrode 17 and the second auxiliary electrode 27 are redox media for each other.

[0110] The first auxiliary electrode 17 and the second auxiliary electrode 27 serve as redox media for each other. The redox media can be, but is not limited to, H4[SiW] suitable for acidic environments. 12 O 40 ]、Co 3+ / Co 2+ Mn 3+ / Mn 2+ Ce 4+ / Ce 3+ V 3+ / V 2+ And so on, it can also be, but is not limited to, Fe(CN)6 suitable for alkaline environments. 3- / Fe(CN)6 4- In some embodiments of this application, the redox medium of the first auxiliary electrode 17 and the second auxiliary electrode 27 is Ni(OH)2 / NiOOH, such as Ni(OH)2 / NiOOH, Fe(OH)2 / FeOOH, Cd / Cd(OH)2, Zn / ZnO, and MnO2 / MnOOH.

[0111] This configuration enables the charging and discharging of the membrane-free electrochemical energy storage device 100 through the redox reaction of the first auxiliary electrode 17 and the second auxiliary electrode 27, which is beneficial to improving the charging and discharging efficiency of the membrane-free electrochemical energy storage device 100 and improving the reliability of the membrane-free electrochemical energy storage device 100.

[0112] In some embodiments of the present invention, such as Figures 7-9 As shown, the outer edge of the partition 3 has a first liquid inlet 314 and a first liquid outlet 313; the partition 3 has a first liquid inlet 312 and a first liquid outlet 311 that are open toward the first end plate 11, and the first liquid inlet 314, the first liquid inlet 312, the first liquid outlet 311, and the first liquid outlet 313 are connected in sequence; or, the partition 3 has a third connecting groove 53 that is open toward the first end plate 11, and the first liquid inlet 314, the third connecting groove 53, and the first liquid outlet 313 are connected in sequence.

[0113] The outer edge of the partition 3 has a first liquid inlet 314 and a first liquid outlet 313. That is, the outer edge of the partition 3 has a first liquid inlet 314 and a first liquid outlet 313, which can be connected to the pipeline.

[0114] As some embodiments of this application, the partition 3 has a first liquid inlet 312 and a first liquid outlet 311 that open toward the first end plate 11. In other words, both the first liquid inlet 312 and the first liquid outlet 311 are open toward the first chamber 1. The first liquid inlet 314, the first liquid inlet 312, the first liquid outlet 311, and the first liquid outlet 313 are sequentially connected so that liquid can flow into the first chamber 1 through the first liquid inlet 314 and the first liquid inlet 312, or flow out of the first chamber 1 through the first liquid outlet 311 and the first liquid outlet 313.

[0115] As some embodiments of this application, such as Figure 8 As shown, the partition 3 has a first connecting groove 33 that opens toward the partition 3. The first liquid inlet 314, the first connecting groove 33, and the first liquid outlet 313 are connected in sequence so that liquid can flow into the first chamber 1 through the first liquid inlet 314 and the first connecting groove 33, and flow out of the first chamber 1 through the first connecting groove 33 and the first liquid outlet 313.

[0116] As some embodiments of this application, such as Figure 10 As shown, the second sealing gasket 112 has a fifth through hole 54 and a sixth through hole 55. The fifth through hole 54 is correspondingly disposed to and communicates with the first liquid inlet 312, and the sixth through hole 55 is correspondingly disposed to and communicates with the first liquid outlet 311. As some embodiments of this application, the second sealing gasket 112 has a fifth through hole 54 and a sixth through hole 55. Both the fifth through hole 54 and the sixth through hole 55 are communicated to the third communicating groove 53. This arrangement can reduce the probability of liquid leakage and is beneficial to improving the reliability of the membraneless electrochemical energy storage device 100.

[0117] This configuration allows liquid to flow into and out of the first chamber 1. Furthermore, this configuration is simple and reliable, which helps to improve the reliability of the membrane-free electrochemical energy storage device 100.

[0118] As some embodiments of this application, the gas in the first chamber 1 can flow out through the first liquid outlet 313.

[0119] In some embodiments of the present invention, such as Figures 7-9 As shown, the outer edge of the partition 3 has a second liquid inlet 324 and a second liquid outlet 323; the partition 3 has a second liquid inlet 322 and a second liquid outlet 321 that are open toward the second end plate 21, and the second liquid inlet 324, the second liquid inlet 322, the second liquid outlet 321 and the second liquid outlet 323 are connected in sequence; or, the partition 3 has a fourth connecting groove 63 that is open toward the second end plate 21, and the second liquid inlet 324, the fourth connecting groove 63 and the second liquid outlet 323 are connected in sequence.

[0120] The partition 3 has a second liquid inlet 324 and a second liquid outlet 323 on its outer edge. In other words, the outer edge of the partition 3 has a second liquid inlet 324 and a second liquid outlet 323, which can be connected to the pipeline.

[0121] As some embodiments of this application, the partition 3 has a second liquid inlet 322 and a second liquid outlet 321 that are open toward the second end plate 21. In other words, the second liquid inlet 322 and the second liquid outlet 321 are both open toward the second chamber 2. The second liquid inlet 324, the second liquid inlet 322, the second liquid outlet 321, and the second liquid outlet 323 are sequentially connected so that liquid can flow into the first chamber 1 through the second liquid inlet 324 and the second liquid inlet 322, or flow out of the first chamber 1 through the second liquid outlet 321 and the second liquid outlet 323.

[0122] As some embodiments of this application, such as Figure 8 As shown, the partition 3 has a fourth connecting groove 63 that opens toward the second end plate 21. The second liquid inlet 324, the fourth connecting groove 63, and the second liquid outlet 323 are connected in sequence so that liquid can flow into the second chamber 2 through the second liquid inlet 324 and the fourth connecting groove 63, and flow out of the first chamber 1 through the fourth connecting groove 63 and the second liquid outlet 323.

[0123] As some embodiments of this application, such as Figure 10 As shown, the fourth sealing gasket 212 has a seventh through hole 64 and an eighth through hole 65. The seventh through hole 64 is correspondingly disposed to and communicates with the second liquid inlet 322, and the eighth through hole 65 is correspondingly disposed to and communicates with the second liquid outlet 321. As some embodiments of this application, the fourth sealing gasket 212 has a seventh through hole 64 and an eighth through hole 65. Both the seventh through hole 64 and the eighth through hole 65 are communicated to the fourth communicating groove 63. This arrangement can reduce the probability of liquid leakage and is beneficial to improving the reliability of the membraneless electrochemical energy storage device 100.

[0124] This configuration allows liquid to flow into and out of the second chamber 2. Furthermore, this configuration is simple and reliable, which helps to improve the reliability of the membrane-free electrochemical energy storage device 100.

[0125] As some embodiments of this application, the gas in the first chamber 2 can flow out through the second liquid outlet 323.

[0126] In some embodiments of the present invention, such as Figure 15As shown, the membrane-free electrochemical energy storage device 100 further includes: a first liquid storage tank 411, a second liquid storage tank 421, a first multi-way valve 413, a second multi-way valve 423, a third multi-way valve 414, and a fourth multi-way valve 424. The first liquid storage tank 411 is selectively connected to the first chamber 1 and / or the second chamber 2 through the first multi-way valve 413. The second liquid storage tank 421 is selectively connected to the first chamber 1 and / or the second chamber 2 through the second multi-way valve 423. The first chamber 1 is selectively connected to the first liquid storage tank 411 and / or the second liquid storage tank 421 through the third multi-way valve 414. The second chamber 2 is selectively connected to the first liquid storage tank 411 and / or the second liquid storage tank 421 through the fourth multi-way valve 424.

[0127] Specifically, the first liquid storage tank 411 can be connected to the first chamber 1 through the first multi-way valve 413, and the first liquid storage tank 411 can be connected to the second chamber 2 through the first multi-way valve 413. The second liquid storage tank 421 can be connected to the first chamber 1 through the second multi-way valve 423, and the second liquid storage tank 421 can be connected to the second chamber 2 through the second multi-way valve 423.

[0128] Specifically, the first chamber 1 can be connected to the first liquid storage tank 411 via the third multi-way valve 414, and the first chamber 1 can also be connected to the second liquid storage tank 421 via the third multi-way valve 414. The second chamber 2 can be connected to the first liquid storage tank 411 via the fourth multi-way valve 424, and the second chamber 2 can also be connected to the second liquid storage tank 421 via the fourth multi-way valve 424.

[0129] As some embodiments of this application, the membrane-free electrochemical energy storage device 100 further includes: a first peristaltic pump 412 and a second peristaltic pump 422. The first peristaltic pump 412 is connected between the first storage tank 411 and the first multi-way valve 413, and the second peristaltic pump 422 is connected between the second storage tank 421 and the second multi-way valve 423. This arrangement enables the electrolyte in the first storage tank 411 to be pumped to the first chamber 1 and / or the second chamber 2 by the first peristaltic pump 412, and enables the electrolyte in the second storage tank 421 to be pumped to the first chamber 1 and / or the second chamber 2 by the second peristaltic pump 422, which is beneficial to improving the stability of electrolyte flow.

[0130] This configuration allows the electrolyte in the first storage tank 411 to selectively enter the first chamber 1 and / or the second chamber 2, and the electrolyte in the second storage tank 421 to selectively enter the first chamber 1 and / or the second chamber 2. It also allows the electrolyte or gas flowing out of the first chamber 1 to selectively enter the first storage tank 411 and / or the second storage tank 421, and the electrolyte or gas flowing out of the second chamber 2 to selectively enter the first storage tank 411 and / or the second storage tank 421. This configuration ensures a reasonable setup for the membrane-free electrochemical energy storage device 100, allows for proper circulation of gas and electrolyte within the device, guarantees continuous and stable operation of the device, and improves its reliability.

[0131] In some embodiments of the present invention, such as Figure 15 As shown, the membraneless electrochemical energy storage device 100 also includes: a hydrogen storage tank 416 and a fifth multi-way valve 415, wherein the hydrogen storage tank 416 is selectively connected to the first chamber 1 and / or the second chamber 2 through the fifth multi-way valve 415;

[0132] And / or, the membrane-free electrochemical energy storage device 100 further includes: a sixth multi-way valve 425 through which oxygen is selectively connected to the first chamber 1 and / or the second chamber 2.

[0133] As some embodiments of this application, the hydrogen storage tank 416 can be connected to the first chamber 1 through the fifth multi-way valve 415, and the hydrogen storage tank 416 can be connected to the second chamber 2 through the fifth multi-way valve 415.

[0134] As some embodiments of this application, oxygen can be connected to the first chamber 1 through the sixth multi-way valve 425, and oxygen can also be connected to the second chamber 2 through the sixth multi-way valve 425. As some embodiments of this application, the membrane-free electrochemical energy storage device 100 further includes an oxygen storage tank, from which oxygen can be supplied.

[0135] This configuration allows hydrogen to enter the first chamber 1 and / or the second chamber 2, and oxygen to enter the first chamber 1 and / or the second chamber 2. It reduces the difficulty of piping layout in the membraneless electrochemical energy storage device 100, allows the reaction in the membraneless electrochemical energy storage device 100 to proceed smoothly, and helps to improve the reliability of the membraneless electrochemical energy storage device 100.

[0136] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0137] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0138] In the description of this invention, "a plurality of" means two or more.

[0139] In the description of this invention, 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.

[0140] In the description of this invention, 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 indicating that the first feature is at a higher horizontal level than the second feature.

[0141] 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 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.

[0142] Although embodiments of the 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 invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A membrane-free electrochemical energy storage device, characterized in that, include: A first energy storage device, a second energy storage device, and a partition plate are provided. Along the thickness direction of the partition plate, the first energy storage device and the second energy storage device are respectively disposed on both sides of the partition plate and are both connected to the partition plate. From the direction away from the partition to the direction closer to the partition, the first energy storage device includes, in sequence, a first end plate, a first sealing gasket, a first current collector, a first gas diffusion electrode, a first porous membrane, a first auxiliary electrode, a second porous membrane, a first porous electrode, a second current collector, and a second sealing gasket. The first energy storage device and the partition together define a first chamber. From the direction away from the partition to the direction closer to the partition, the second energy storage device includes, in sequence, a second end plate, a third sealing gasket, a third current collector, a second gas diffusion electrode, a third porous membrane, a second auxiliary electrode, a fourth porous membrane, a second porous electrode, a fourth current collector, and a fourth sealing gasket. The second energy storage device and the partition together define a second chamber. The first end plate, the partition plate, and the second end plate are connected together. A metal strip connected between a first auxiliary electrode and a second auxiliary electrode.

2. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The first energy storage device further includes: a first sealing ring and a second sealing ring, wherein the first sealing ring is sleeved on the first gas diffusion electrode and sandwiched between the first current collector and the first porous membrane, and the second sealing ring is sleeved on the first porous electrode and sandwiched between the second porous membrane and the second current collector.

3. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The second energy storage device further includes: a third sealing ring and a fourth sealing ring, wherein the third sealing ring is sleeved on the second gas diffusion electrode and sandwiched between the third current collector and the third porous membrane, and the fourth sealing ring is sleeved on the second porous electrode and sandwiched between the fourth porous membrane and the fourth current collector.

4. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The metal strip is constructed of copper or nickel.

5. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The outer edge of the first end plate has a first air inlet and a first air outlet; The first end plate has a first air inlet and a first air outlet that are open toward the partition, and the first air inlet, the first air outlet, and the first air outlet are connected in sequence; or, the first end plate has a first connecting groove that is open toward the partition, and the first air inlet, the first connecting groove, and the first air outlet are connected in sequence.

6. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The outer edge of the second end plate has a second air inlet and a second air outlet. The second end plate has a second air inlet and a second air outlet that are open toward the partition, and the second air inlet, the second air outlet, and the second air outlet are connected in sequence; or, the second end plate has a second connecting groove that is open toward the partition, and the second air inlet, the second connecting groove, and the second air outlet are connected in sequence.

7. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The first current collector, the second current collector, the third current collector, and the fourth current collector all have flow channels. The first current collector has a first tab, the second current collector has a second tab, the third current collector has a third tab, and the fourth current collector has a fourth tab. Along the thickness direction of the partition plate, the first tab and the third tab are arranged opposite each other, and the second tab and the fourth tab are arranged opposite each other.

8. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, Both the first gas diffusion electrode and the second gas diffusion electrode include: a substrate layer, a microporous layer, and a catalyst layer. The substrate layer is located between the corresponding microporous layer and the corresponding catalyst layer, and the catalyst layer is located on the side of the corresponding substrate layer facing the partition.

9. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The first auxiliary electrode and the second auxiliary electrode serve as redox media for each other.

10. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The outer edge of the partition has a first liquid inlet and a first liquid outlet; The partition has a first liquid inlet and a first liquid outlet open toward the first end plate, and the first liquid inlet, the first liquid outlet, the first liquid outlet and the first liquid outlet are connected in sequence; or, the partition has a third connecting groove open toward the first end plate, and the first liquid inlet, the third connecting groove and the first liquid outlet are connected in sequence.

11. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, The outer edge of the partition has a second liquid inlet and a second liquid outlet; The partition has a second liquid inlet and a second liquid outlet that are open toward the second end plate, and the second liquid inlet, the second liquid outlet, and the second liquid outlet are connected in sequence. Alternatively, the partition has a fourth connecting groove that is open toward the second end plate, and the second liquid inlet, the fourth connecting groove, and the second liquid outlet are connected in sequence.

12. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, Also includes: The system comprises a first liquid storage tank, a second liquid storage tank, a first multi-way valve, a second multi-way valve, a third multi-way valve, and a fourth multi-way valve. The first liquid storage tank is selectively connected to the first chamber and / or the second chamber via the first multi-way valve. The second liquid storage tank is selectively connected to the first chamber and / or the second chamber via the second multi-way valve. The first chamber is selectively connected to the first liquid storage tank and / or the second liquid storage tank via the third multi-way valve. The second chamber is selectively connected to the first liquid storage tank and / or the second liquid storage tank via the fourth multi-way valve.

13. The membrane-free electrochemical energy storage device according to claim 1, characterized in that, Also includes: A hydrogen storage tank and a fifth multi-way valve, wherein the hydrogen storage tank is selectively connected to the first chamber and / or the second chamber via the fifth multi-way valve; And / or, the membrane-free electrochemical energy storage device further includes: a sixth multi-way valve through which oxygen is selectively connected to the first chamber and / or the second chamber.

Images