122 results about "Half-cell" patented technology

The invention relates to a sulfonic group modified ZIF-67 coated diaphragm as well as a preparation method and application thereof, and belongs to the technical field of lithium batteries. Comprising a porous base membrane and a modified coating coated on one side or two sides of the porous base membrane, and the modified coating comprises sulfonic group functionalized ZIF-67 nanoparticles and a binder, the sulfonic group functionalized ZIF-67 nanoparticles are a metal organic framework material formed by coordination self-assembly of a cobalt source, a 2-methylimidazole ligand and an imidazole auxiliary ligand containing a sulfonic acid group. Imidazole ligands with sulfonic acid groups are introduced into a ZIF-67 framework through in-situ coordination self-assembly, homogenization of lithium ion flux is achieved through regular pore channels of ZIF-67, meanwhile, anion decomposition is promoted through the electrostatic induction effect of the sulfonic acid groups, and the lithium ion transference number is increased. The diaphragm can effectively inhibit the growth of lithium dendrites, and shows excellent cycling stability and rate capability in an NCM811 / Li metal total battery, a Li-Li symmetric battery and a Li-Cu half battery.

The invention relates to the technical field of fuel cells, and provides a solid oxide fuel cell and a preparation method thereof, and the preparation method comprises the following steps: providing a half-cell precursor comprising an electrolyte layer and a NiO-based ceramic layer; placing the half-cell precursor in an acid solution for reaction treatment, selectively etching to remove at least part of NiO phase in the NiO-based ceramic layer, and cleaning to form a porous ceramic layer; injecting nickel slurry into pores of the porous ceramic layer, and performing drying and first calcination treatment to form a porous Ni-based metal ceramic composite anode layer; and preparing a porous cathode layer on the surface of the other side of the electrolyte layer to form the solid oxide fuel cell. According to the method, the NiO phase of the NiO-based ceramic layer is removed by using the pickling solution, and the nickel slurry is injected to construct the porous Ni-based metal ceramic composite anode, so that the problems that the pore structure is random and difficult to control when the porous anode is prepared by pore-forming of a traditional pore-forming agent and reduction of NiO by introducing hydrogen, and the active area of the anode is reduced due to migration, agglomeration and coarsening of Ni particles are solved.

The application discloses a kind of half battery and its preparation method, the detection method of open-circuit voltage.The preparation method of the half battery includes the following steps: lithium sheet, separator and graphite pole piece are stacked in sequence, and sealing, standing are carried out, and half battery is obtained;Before stacking the separator, first electrolyte is added to the lithium sheet;Before stacking the graphite pole piece, second electrolyte is added to the separator;The volume ratio of the first electrolyte and the second electrolyte is 1: (1-5).When the half battery prepared by the half battery preparation method of the application is detected by open-circuit voltage, the reliability and stability of the obtained open-circuit voltage are better, and can be used to judge the performance of battery and / or electrode material.

The application provides a positive electrode active material of Li 1+x Ni y M z Mn 2‑x‑y‑z O 4‑k , -0.1≤x≤0.2, 0.4≤y≤0.6, 0≤z≤0.2, M is one or more of Cr, Mo, Nb, Ru, P, S, Ta, W, Tl and Ti, in the first circle charging curve of the half cell of the positive electrode active material, the ratio of the charging capacity of 3.5V-4.4V to the charging capacity of 3.5V-4.95V is A, A satisfies 0.04≤A≤0.3, the product of k and A satisfies 0≤kA≤0.015, and the first circle charging curve is measured at a rate of 0.1C. The positive electrode active material of the application has high kinetic performance and high chemical stability, and the corresponding secondary battery has high rate discharge capacity and long-term storage stability.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

This application discloses a swelling force testing system and method. The swelling force testing system includes a half-cell and a processor. The half-cell includes an active material to be tested and a piezoelectric element is disposed in the half-cell. The piezoelectric element is connected to the processor and is used to output a voltage to the processor based on its own force. The processor is used to determine the swelling force of the active material to be tested based on a first voltage, which is the voltage output by the piezoelectric element when the half-cell is fully charged. In this way, when the active material to be tested expands, the piezoelectric element can be subjected to pressure and output a voltage to the processor based on its own force. The processor can then determine the swelling force of the active material to be tested based on the voltage output by the piezoelectric element when the half-cell is fully charged, thereby achieving accurate detection of the swelling force of the active material.

The present invention relates to a positive electrode including a positive electrode active material layer including a first positive electrode active material and a second positive electrode active material having an average particle diameter different from each other, in which the average particle diameter D50 of the first positive electrode active material is larger than the average particle diameter D50 of the second positive electrode active material, the first positive electrode active material and the second positive electrode active material include single-particle-type particles, the interface resistance of the positive electrode having a SOC of 50% measured in a coin half cell manufactured using the positive electrode is 6.5 Omega to 8.5 Omega, and the interface resistance of the positive electrode having a SOC of 10% measured in a coin half cell manufactured using the positive electrode is 15 Omega to 19 Omega.

The application provides a SOC and SOH combined estimation method of a full vanadium liquid flow battery, and the method comprises the following steps: S1. constructing an equivalent circuit model, determining parameters of the equivalent circuit model as an activation polarization overpotential V act , a concentration polarization overpotential V con , a pump loss current I pump , an ohmic loss R ohm and an open circuit voltage V s ; S2. constructing a parameter calculation model based on multiple physical fields for calculating the parameters in the equivalent circuit model; S3. substituting material performance parameter values of the full vanadium liquid flow battery into the parameter calculation model to obtain a full vanadium liquid flow battery simulation model with the same or similar material performance; and S4. inputting specific size parameter values of a monitored full vanadium liquid flow battery into the parameter calculation model in step S3 to estimate the SOC and SOH of the monitored full vanadium liquid flow battery. The application improves the universality of the equivalent circuit model for various types of full vanadium liquid flow batteries, can estimate the SOC and SOH of the positive and negative half-cells respectively, and more comprehensively monitors the conditions in the actual operation process of the full vanadium liquid flow battery.

An electrosynthetic cell and its use are disclosed. The electrosynthetic cell can be used in a reductive electrosynthesis of one or more desired chemical products from one or more chemical reactants. The electrosynthetic cell comprises a hydrogen anode half-cell and a cathode half-cell. The hydrogen anode half-cell comprises hydrogen (H2), a first liquid phase solution that is in contact with an anode and a heterogeneous redox catalyst capable of catalyzing the oxidation of H2 to H+, and a redox mediator capable of transferring or accepting electrons and / or protons while undergoing reduction or oxidation. The cathode half-cell comprises a second liquid phase solution comprising the one or more chemical reactants that is in contact with a cathode and a reductive synthesis catalyst capable of catalyzing the reductive synthesis of the one or more desired chemical products from the one or more chemical reactants.

The application provides a preparation method of a pre-lithiated positive electrode sheet, the pre-lithiated positive electrode sheet and application thereof. The preparation method comprises the following steps: S1. completely immersing the positive electrode sheet in an organic lithium salt solution for pre-lithiation treatment; S2. after the pre-lithiation of the positive electrode sheet, the positive electrode sheet is dried, and a half-cell is assembled by taking the positive electrode sheet as a working positive electrode and taking metal lithium or a lithium-containing material as a counter electrode or a reference electrode; in an electrolyte system containing a lithium salt, a constant voltage is applied for treatment, the voltage range is 2.0-3.5 V (relative to Li + / Li), and the treatment time is 10-120 min; S3. the working electrode is taken out, washed and dried to obtain the pre-lithiated positive electrode sheet. The preparation method can effectively change the waste into treasure of the residual material that needs to be removed in the traditional pre-lithiation process, and in-situ construct a functional CEI layer. The layer can physically and chemically lock the pre-embedded active lithium and inhibit the subsequent loss; at the same time, as an excellent artificial interface layer, the layer can stabilize the positive electrode / electrolyte interface, and especially improve the cycle performance under high voltage.

The invention relates to the technical field of solid oxide fuel cells, and discloses a preparation method and system of a solid oxide fuel cell, and the preparation method comprises the following steps: preparing a half-cell and nano electrolyte particle suspension; one side of the electrolyte layer close to the anode is kept in a vacuum state, and one side of the electrolyte layer far away from the anode is impregnated with nano-electrolyte particle suspension; scraping off the weakly bonded nano electrolyte particles on the impregnated side of the electrolyte layer; and calcining the scraped half cell in a vacuum atmosphere to obtain a compact electrolyte layer. The side, close to an anode, of an electrolyte layer is kept in a vacuum state, so that nano electrolyte particles can penetrate into cracks, the effect of repairing the electrolyte layer is achieved, and the densification degree of the electrolyte layer is improved; it is ensured that strong combination electrolyte particles are left on the dipping side of the electrolyte layer, and the cathode can be tightly combined with the electrolyte layer after calcination.

An electrochemical reactor, which may be a half-cell of a rechargeable battery, comprises a liquid electrolyte which is pumped through the half-cell and has an electrochemical system in which a solid is deposited at an electrode while electric current is flowing. The liquid comprises a high molecular weight polymer or a viscoelastic surfactant enabling elastic turbulence to occur and the half-cell is configured to compel through flow to make changes in direction, so that elastic turbulence occurs, enhancing mass transport through the liquid and reducing overpotential at the electrode, which enhances uniformity of deposited solid and inhibits parasitic reactions.

The application provides a kind of zero-dimensional-one-dimensional composite positive electrode material and its preparation method and application, belong to battery positive electrode material field.The zero-dimensional-one-dimensional composite positive electrode material provided by the application includes nanoparticle positive electrode material and nanofiber positive electrode material;The mass ratio of the nanoparticle positive electrode material and nanofiber positive electrode material is 1: (0.2~1.5).The zero-dimensional-one-dimensional composite positive electrode material provided by the application is applied as active material in lithium ion battery positive electrode sheet, can make the first coulomb efficiency of half-cell reach 84.23%, with higher first coulomb efficiency;The specific capacity under 0.1C rate can reach 270.29mAhg ‑1 , with high specific capacity;The specific capacity under 8C high rate can still be kept at 82.03mAhg ‑1 , with excellent rate performance;Capacity retention rate can reach 86.68% after 300 cycles under 2C rate, with good cycle stability.

This invention provides an ether-based electrolyte for improving the high-voltage and long-cycle stability of sodium-ion batteries, its preparation method, and its application. The ether-based electrolyte comprises a base electrolyte and additives; the additives include aromatic isocyanates and alkoxysilanes. The aromatic isocyanates are a combination of one of the following: 6-fluoro-1H-1,3-benzodioxane-8-yl isocyanate, 3,4-dihydro-1,5-benzodioxane-7-isocyanate, or 3,4-(methylenedioxy)phenyl isocyanate, and 4-trifluoromethoxyphenyl isocyanate; the alkoxysilanes are 2-cyanoethyltriethoxysilane or 3,3,3-trifluoropropyltriethoxysilane. The electrolyte of this invention achieves synergistic regulation of interfacial reactions and interfacial film evolution, is suitable for sodium-ion half-cells or full-cells, and can improve overall stability and operating efficiency under high-voltage and long-cycle operating conditions.

An anode active material, of which conductivity and durability are enhanced by repairing damage to silicon crystals during a secondary granulation process includes secondary silicon particles formed by aggregation of primary silicon particles; and a carbon layer on the second silicon particles. The ratio of the maximum discharge peaks obtained from the differential capacity plot for a half-cell comprising the anode active material is equal to or greater than about 1.2.

The invention relates to application of a zinc-based metal organic framework material in water-based zinc ion battery negative electrode protection. The invention relates to an application of a zinc-based metal organic framework material in water-based zinc ion battery negative electrode protection, in particular to a method for coating the zinc-based metal organic framework material Zn (btec) on the surface of a zinc electrode to construct a protective coating and form a Zn (btec) (at) Zn negative electrode. The coating can remarkably inhibit dendritic crystal growth, corrosion, hydrogen evolution and other side reactions of the zinc electrode in the charging and discharging process, and the safety performance and cycling stability of the battery are effectively improved. An electrochemical test shows that the symmetrical battery based on the Zn (becc) (at) Zn negative electrode stably operates for 2100 hours under the conditions of 0.5 mAcm <-2 > and 0.5 mAhcm <-2 >; under the conditions of 4mAcm <-2 > and 1mAhcm <-2 >, the half cell realizes 3000 cycles, and the coulombic efficiency is close to 100%; and after the whole battery circulates for 700 weeks at 1Ag <-1 >, the specific capacity is still kept at 91.4 mAhg <-1 >. Besides, after 86 cycles under 1Ag <-1 >, the capacity retention ratio of a soft package battery assembled by adopting the negative electrode is close to 100%, the specific discharge capacity is 150mAhg <-1 >, a load with the rated voltage of 6V can be successfully driven, and a good practical application prospect is shown. The negative electrode protection method provided by the invention is simple in process, relatively low in cost and suitable for large-scale production, and an effective way is provided for development of high-performance and long-life aqueous zinc ion batteries.

The invention provides a method for determining the effective discharge specific capacity of a negative electrode active material in a full battery. The method comprises the following steps: testing to obtain the charge specific capacity C0 of the negative electrode active material in a half battery; the conversion coefficient is preset to be P, and the estimated specific discharge capacity C estimated 0 of the negative electrode active material in the whole battery is obtained; when the preset N / P value is less than 1, manufacturing a first total battery by using the positive pole piece and the negative pole piece; presetting a pre-estimated discharge specific capacity gradient sequence of the negative active material in the first total battery by taking the C pre-estimated 0 as a central value, and calculating a corresponding pre-estimated discharge specific capacity gradient sequence of the negative active material in the first total battery; taking the estimated discharge capacity in the estimated discharge capacity gradient sequence of the negative electrode active material in the first total battery as the charging cut-off capacity, and carrying out a full charge test on the first total battery; and determining the effective specific discharge capacity of the negative electrode active material in the total battery from the estimated specific discharge capacity of the negative electrode active material in the first total battery according to the metal precipitation condition of the negative electrode interface.

This application discloses a variable current charging method for lithium batteries, relating to the field of electrochemical testing. The method includes assembling a half-cell of the lithium battery under test; determining the intrinsic kinetic parameters of the half-cell under each preset state of charge by performing in-situ electrochemical impedance spectroscopy, and plotting the relationship curves between the intrinsic kinetic parameters and the state of charge; dividing the preset state of charge intervals in the relationship curves to obtain high and low kinetic windows; determining a variable current charging strategy, which includes: charging with a reference rate current within the low kinetic window, and charging with a current rate higher than the reference rate within the high kinetic window; and regulating the variable current charging of the lithium battery under test according to the variable current charging strategy. This application can significantly shorten the charging time while improving the lifespan and safety of lithium batteries.

The invention provides a method and a device for detecting a sodium separation threshold value of a sodium ion battery negative electrode material, and belongs to the field of lithium ion batteries. The method for detecting the sodium separation threshold value of the battery negative electrode material comprises the following steps: assembling a negative electrode material to be detected into a half-battery system; discharging the half-cell system for multiple times by utilizing constant current; acquiring the voltage change of the half-cell system after each discharge; determining an internal resistance value change curve of the half-cell system in the whole discharge process based on the voltage change of the half-cell system after each discharge; and determining the sodium separation threshold value of the negative electrode material of the half-cell system based on the internal resistance value change curve. According to the invention, accurate determination of the sodium separation threshold value of the sodium ion battery negative electrode material can be realized.

Device for storing electrical energy in chemical redox compounds in the form of a redox flow battery, based on at least two liquid redox electrolytes (catholyte and anolyte (4)), comprising at least one electrochemical flow cell consisting of two half-rows, each with an electrode compartment through which a redox electrolyte flows, and a collector electrode made of a chemically inert, electron-conducting material (2) and circulating pumps (3), wherein the two half-cells are separated by an impermeable, electrically non-conducting wall (1), characterized in that a) the electrochemical conversion of the redox electrolytes in question is quantitatively controlled during a single half-cell flow and discharged redox electrolytes leave the flow cell, b) during the discharge process, the discharged catholyte and anolyte fluids or parts thereof form an uninterrupted electrolytic current key within a defined mixing zone of both, which electrolytically connects the two half-cells at the outlet, and during the charging process, a corresponding uninterrupted current key is formed by a defined flow division of discharged catholyte and anolyte before the inlet of both half-cells, both of which replace a semipermeable membrane. c) Catholyte and anolyte contain more than one redox system, d) the discharged redox electrolytes exiting the flow cell and combined according to the current key are separated again into catholyte and anolyte fractions and stored separately from their still charged fraction, e) the discharged redox electrolytes are temporarily stored in containers that can act as a pump.

The invention relates to a reversible oxygen ion conductor ceramic fuel cell and a preparation method thereof. The preparation method comprises the following steps: providing a Ni-YSZ / YSZ half cell; coating the surface of an electrolyte layer of the half cell with the GDC slurry through a wet spraying process; coating the Yb-doped CaMnO3 perovskite type oxide cathode slurry on the surface of a GDC layer of a half cell through a screen printing process; standing, drying and calcining to obtain a cathode; and carrying out electrode sintering and electrochemical activation treatment to obtain the reversible oxygen ion conductor ceramic fuel cell. The fuel cell cathode is prepared from the cobalt-free strontium-free Yb-doped CaMnO3 perovskite material, so that the problems that the thermal expansion matching property of a traditional cathode is poor, and a high-resistance phase is easily generated on an interface are effectively solved; in cooperation with a casting-co-sintering integrated preparation process, compact forming and tight combination of functional layers of the fuel cell are realized, and interlayer interface compatibility and structural stability are optimized.

The invention discloses a preparation method of a solid oxide fuel cell based on an ultrathin electrolyte layer. The method comprises the following steps: preparing slurry for preparing an anode support body, an anode active layer, an electrolyte layer, a barrier layer and a composite cathode layer; preparing an anode support body-anode active layer integrated biscuit from the anode support body slurry and the anode active layer slurry by using a tabletting method, and carrying out degumming and sintering to obtain an anode support body-anode active layer composite structure; spin-coating electrolyte layer slurry on the surface of the anode support body-anode active layer composite structure, and preparing an ultrathin electrolyte layer by a spin-coating method to obtain a half-cell biscuit; then, glue discharging and sintering are performed to obtain a half cell; and sequentially carrying out silk-screen printing on barrier layer slurry and composite cathode layer slurry on the surface of the half cell, and carrying out drying, glue discharging and co-sintering to finally obtain the single cell of the solid oxide fuel cell. The fuel cell prepared by the invention has good electrochemical performance and stability.

The invention belongs to the technical field of new energy materials and electrochemical devices, and particularly relates to a metal-supported proton conductive solid oxide fuel half cell and a preparation method thereof. The half cell comprises a metal supporting layer, a transition layer, an anode functional layer and an electrolyte layer, wherein the metal supporting layer is formed by reducing NiO and MgO and has a gradient pore structure; the transition layer is made of a BaZr < 0.3 > Ce < 0.5 > Y < 0.2 > O < 3-delta > proton conductor material; the anode functional layer is made of a NiO-BZCY metal ceramic composite material; through the NiO-MgO composite support body design and the gradient transition layer structure, the high power density of 0.85 W / cm < 2 > and the low polarization resistance of 0.08 omega.cm < 2 > are achieved at the temperature of 400-650 DEG C, the metal / ceramic interface matching problem is solved through the casting-co-firing-controllable reduction technology, the thermal cycle life breaks through 500 times, and large-scale preparation of a 20 cm * 20 cm large-size battery is achieved.

The invention discloses a manufacturing method of an anode support type solid oxide fuel cell (SOFC) half cell, the anode support type SOFC half cell and the anode support type SOFC half cell, which are used for solving the technical problems that the thickness of an electrolyte layer is reduced due to the fact that the existing anode support type SOFC half cell is used for guaranteeing the ventilation capacity, so that hole defects are easily generated on the surface of the electrolyte layer, and fuel leakage is caused. The manufacturing method specifically comprises the following steps: S1, manufacturing a graphite net; s2, manufacturing an anode supporting layer with a graphite net; s3, manufacturing an anode functional layer; s4, manufacturing an electrolyte layer; s5, a wet-pressing lamination mode is adopted, and an anode functional layer is laminated on each of the two opposite surfaces of the anode supporting layer, so that a first combined green body is obtained; s6, superposing an electrolyte layer on the surface of the anode functional layer of the first combined green body in a warm water wet pressing and superposing manner to obtain a second combined green body; and S7, carrying out degumming sintering on the second combined green body to obtain the anode support type SOFC half cell with the air passage.

A method of manufacturing a proton-conducting fuel cell (PCFC) includes assembling a green anode-electrolyte half-cell. The green anode-electrolyte half-cell includes an electrolyte layer, an anode functional layer adjacent the electrolyte layer, an anode substrate layer adjacent the electrolyte layer, and a stress balancing layer adjacent the anode substrate layer. The method further includes sintering the green anode-electrolyte half-cell using solid state reaction sintering to form an anode-electrolyte half-cell.

A positive electrode for a lithium secondary battery according to embodiments of the present disclosure comprises a positive electrode active material layer containing a positive electrode active material and having a density of 3 g / cm3 or more, wherein the positive electrode active material includes lithium metal oxide particles containing cobalt, the content of cobalt being 0 mol% (exclusive) to 15 mol% (inclusive) relative to the total number of moles of elements excluding lithium and oxygen. The difference between the charge / discharge efficiency and the charge / discharge efficiency after 10 additional charge / discharge cycles in a half-cell comprising the positive electrode for a lithium secondary battery is less than 1%.

The invention relates to the technical field of fuel cells, and discloses a tubular solid oxide fuel cell (SOFC) stack with waste heat utilization, which comprises a metal cover and a cell unit, the cell unit is fixedly connected in the metal cover, and the cell unit is composed of at least one group of anode half cell unit and cathode half cell unit; according to the invention, the anode half-cell units and the cathode half-cell units are mutually staggered and closely arranged along the chessboard-shaped manner, so that the area of the outer surface is obviously increased, and a larger effective reaction area is provided for an electrode-electrolyte interface; an electron transmission path between adjacent units is changed from traditional transmission along a tube axis direction to short-distance transverse transmission, so that the length of an electron flow path is remarkably shortened, and the internal ohmic impedance of the whole cell stack is reduced; meanwhile, each half cell unit forms an independent fuel gas or air flow channel, so that the number of middle current collecting components is reduced, and the structural integration level of the cell stack is improved.

A process and system for synthesis of ammonia includes an electrochemical main cell and an electrochemical preliminary cell upstream of the main cell. A voltage is applied between the anode and cathode of the preliminary cell and the main cell. The anodic half-cell of the preliminary cell is supplied with water, and the cathodic half-cell of the preliminary cell with nitrogen and oxygen. Oxygen is in the anodic half-cell of the preliminary cell, and nitrogen and water are in the cathodic half-cell of the preliminary cell. The anodic half-cell of the main cell is supplied with water, and the cathodic half-cell of the main cell with nitrogen that has been obtained in the cathodic half-cell of the preliminary cell. Oxygen is in the anodic half-cell of the main cell, and ammonia in the cathodic half-cell of the main cell.

The fuel cell pack assembly structure comprises a first membrane electrode, a first sealing element, a first transition layer, a first bipolar plate, an outer sealing element and a plurality of half cell unit bodies, the outer sealing element is bonded on the outer side face of the first bipolar plate, the first transition layer is bonded on the end face, opposite to the first bipolar plate, of the first sealing element, and the half cell unit bodies are bonded on the end face of the first sealing element. The first bipolar plate is bonded on the first transition layer, the other end face of the first sealing piece is connected with the first membrane electrode, the plurality of half cell units are overlapped together, and the first membrane electrode is connected with the whole formed by the plurality of half cell units to form the battery pack. The utility model aims to improve the assembly efficiency and the sealing performance of the bipolar plate and the membrane electrode, improve the stability of the fuel cell, prolong the service life of the fuel cell and increase the product competitiveness. Meanwhile, a battery pack concept which is the same as that of a lithium battery is put forward, and a more stable fuel battery pack and a structure which can replace a damaged battery pack more quickly and conveniently are manufactured.

The present invention relates to a zinc / aqueous polysulfide rechargeable flow battery (100) made ofa first half-cell (110) comprising a first electrolyte (114) containing a source of Zn2+ ions and a static (112) or flowable electrode disposed within the first half-cell, said first half-cell being connected in a closed-loop configuration through a first pump (116) to a first external tank (115) containing the first electrolyte;a second half-cell (120) comprising a second electrolyte (124) in which polysulfides are dissolved and a static (122) or flowable electrode disposed within the second half-cell, said second half-cell being connected in a closed-loop configuration through a second pump (126) to a second external tank (125) containing the second electrolyte; anda catalyst in the second half-cell, on the surface of a static electrode or dispersed in form of particles in the second electrolyte; anda separator (130) between the two half-cells.The rechargeable flow battery of the invention avoids the use of toxic or environmentally harmful chemicals.