67 results about "Lithium-ion flow battery" patented technology

The invention relates to a battery power control method for types of high-capacity megawatt battery energy storage power stations, which comprises the following steps of: A, reading data; B, determining a total command value of each battery energy storage system by using a wavelet transform controller module; C, calculating battery power command values of each energy storage subunit by using a power allocation controller module; D, aggregating the battery power command values of each energy storage subunit by using a power aggregation module; and E, outputting the data. In the method, cooperative control over battery power in the types of high-capacity megawatt battery energy storage power stations based on lithium ions, flows, sodium-sulphur and the like is finished by an industrial personal computer and a communication platform, real-time effective control over the types of high-capacity megawatt battery energy storage power stations can be realized, and the aims of improving the utilization efficiency of energy storage batteries of different types and prolonging the service life of each energy storage battery are fulfilled according to the characteristics of the batteries of different types that lithium ion batteries, sodium-sulphur batteries and flow batteries serve as low frequency, intermediate frequency and high frequency components in current required total power respectively and the like.

The invention discloses a pump-free lithium ion flow battery and belongs to the field of a chemical energy-storing battery. The pump-free lithium ion flow battery comprises a plurality of battery subsystems, an anode liquid preparation tank, a cathode liquid preparation tank, an anode liquid collection tank, a cathode liquid collection tank, an anode conveying tank and a cathode conveying tank. An electrode suspension solution is pushed by gravity and inert gas pressure to circularly flow, so as to avoid using a pump. The pump-free lithium ion flow battery has the advantages of simplicity in operation and convenience for controlling, reduces mechanical loss of a battery system and improves the whole efficiency and the safe use performance of the battery.

The invention relates to a preparation method of a composite current collector combined by carbon nanotube thin layers and a copper sheet or an aluminium sheet, and application of the composite current collector in a lithium ion flow battery. The method comprises the steps of: functionalizing a carbon nanotube so as to make the carbon nanotube having carboxyl or amino groups, depositing the carbon nanotube thin layers on the copper sheet or aluminium sheet through a layer-by-layer self-assembly method under anion-cation interaction, then compacting the deposited copper sheet or aluminium sheet, and carrying out high temperature treatment in a reducing atmosphere, thus obtaining the composite current collector. With the composite current collector, an ion diaphragm, semisolid flow slurries formed by positive and negative electrode active materials in a lithium ion-containing organic solvent, a novel lithium ion flow battery can be assembled. Compared with a single copper sheet or aluminium sheet current collector, the composite current collector of the invention has the advantages of good electronic conductivity and small internal resistance. Compared with traditional lithium ion batteries and flow batteries, the lithium ion flow battery provided in the invention has the advantages of convenient electrode material replacement and high specific energy, thus boasting tremendous application prospects in power and energy storage battery fields.

The invention relates to a novel aqueous lithium ion flow battery with high performances and low cost. A lithium ion intercalation-deintercalation mechanism and a flow battery metal ion deposition-dissolution mechanism are optically combined in an energy storage device. A positive electrode adopts a lithium ion intercalatable-deintercalatable solid oxide material, a negative electrode adopts a deposition type metal electrode material deposited-dissolved on an inert electrode, an electrolyte is an aqueous electrolyte containing lithium ions and capable of depositing and dissolving metal ions, and the separation of positive electrode and the negative electrode by a diaphragm is not needed. In the charge and discharge process, the electrolyte is promoted by a liquid pump to go through a pipeline and continuously circularly flow between a storage tank and a battery main body. The aqueous lithium ion flow battery has the characteristics of long cycle life, high energy efficiency, safety, low cost, less maintenance, environmental protection, high utilization rate and energy density of active substances, and large specific capacity, and is especially suitable for large scale power storage of off-grid renewable energy power generation and distributed power supply.

The invention provides a lithium ion liquid flow cell reactor including a bipolar diaphragm, a positive electrode diversion body and a negative electrode diversion body; each diversion body is formed by arranging a continuous diversion channel in a hollow rectangular-ambulatory-plane frame, the border of the positive electrode diversion body is provided with a positive electrode liquid inlet and a positive electrode liquid outlet, the border of the negative electrode diversion body is provided with an negative electrode liquid inlet and an negative electrode liquid outlet, and the liquid inlet and the liquid outlet of each diversion body communicate through the diversion channel in the diversion body; according to the cell reactor, each cell reaction cavity is provided with one liquid inlet and one liquid outlet, the liquid inlets and the liquid outlets adopt a parallel mode, or a series mode, or a series and parallel mixed mode, so that uniform and consistent shunting and confluence of the lithium ion liquid flow cell reactor are achieved, a shunt cavity and a confluence cavity are omitted, and thus the consistency between the cell units is effectively increased, the cell performance is improved, and the structure of the reactor is greatly simplified.

The invention discloses a matching method of lithium ion batteries, relating to lithium ion batteries and being used for more fully reflecting the difference between unit batteries to be matched and improving the battery matching quality and the integral property of a battery pack after matched. The matching method comprises the steps of: discharging a to-be-matched battery in a full-energy state to reach a low limit voltage in a first constant current, recording a discharge capacity Q1; charging to reach an upper limit voltage in a second constant current, recording a charge capacity Q2 and a charge voltage of the battery at intervals of T; charging to a stop current by using the upper limit voltage in a constant voltage form , recording a charge capacity Q3; calculating a capacity quality coefficient lambda; calculating similarity of a characteristic vector of the unit lithium ion battery, meeting the formula of lambda>=lambda0, and a standard characteristic vector to obtain a correlation coefficient; and according to a value of the correlation coefficient, grading according to a grading numerical value range. The invention is used for matching the lithium ion battery.

The invention provides a charging method for improving charging efficiency of a lithium ion battery. The positive electrode of the lithium ion battery comprises i ( i is greater than or equal to 2) kinds of active substances; the charging method comprises the following steps: (1) voltage is divided into n sections from a small magnitude to a high magnitude within a limited charge voltage scope of the battery, wherein the n is greater than or equal to i; and (2) constant current charging is performed in each voltage section separately; the current is not lower than 0.01C charging multiplying power of a to-be-charged battery, and the charging currents for the adjacent voltage sections are different; when an end voltage of a voltage section is reached, constant voltage charging is performed on the voltage section by the end voltage, or a next voltage section is subjected to the constant current charging, or the charging process is stopped. The charging method can improve the charging efficiency of the battery, and charge the battery with more electric quantity at a shorter time for realizing the rapid charging of the battery.

The present invention provides a lithium ion flow battery, a reactor and an electrode box thereof, and belongs to the technical field of chemical energy storage. The electrode box comprises a box body, the upper surface and the lower surface of the box body are provided with separation film windows, a distance between the separation film windows is more than 500 microns and is less than 10 mm, both opposite side walls of the box body are provided with holes, the holes form an inlet and an outlet of an electrode suspension liquid, a space inside the box body forms a reaction chamber, and a positive electrode current collection sheet or a negative electrode current collection sheet is arranged inside the reaction chamber. According to the present invention, the positive electrode box and the negative electrode box have the same shape, and are alternately laminated along a vertical direction so as to integratedly fix, the inlet and the outlet of the positive electrode suspension liquid of the positive electrode box are perpendicular to the inlet and the outlet of the negative electrode suspension liquid of the negative electrode box, and sealing plates are arranged on the periphery of the laminated electrode boxes to form the independent positive electrode suspension liquid channel and the negative electrode suspension liquid channel so as to form the lithium ion flow battery reactor. According to the present invention, advantages of simple structure, easy preparation, high volumetric power density, low cost and the like are provided.

The invention discloses a high energy density fast charging type lithium ion power battery. The composition of positive and negative pole materials, positive and negative pole pieces, a conductive agent, a diaphragm and an electrolyte are designed. The positive and negative pole materials are modified; the positive and negative pole pieces are designed as multi-lead or all-lead with a void structure; the conductive agent is designed as a 'point-line-face' conductive network; the diaphragm and an electrolyte formula are improved. The lithium ion power battery thus designed has high energy density, and the energy density can reach 260 Wh/kg or more; the charging speed is also greatly improved, and the electric quantity of 80% or more can be changed in 15 minutes without lithium depositing; the battery has good cycle performance, and the capacity retention ratio is greater than 80% after 1500 cycles at the charge-discharge rate of +0.5C/-1C.

A Pump-free lithium ion liquid flow battery, battery reactor and preparation method of electrode suspension solution. The Pump-free lithium ion liquid flow battery includes a positive electrode liquid preparation tank (27), a negative electrode liquid preparation tank (32), a positive electrode liquid collection tank (30), a negative electrode liquid collection tank (35), a positive electrode conveying tank (31), a negative electrode conveying tank (36) and several battery sub-systems. The positive electrode conveying tank (31) intermittently moves vertically to and fro for the transportation of positive electrode suspension solution between the positive electrode liquid collection tank (30) and the positive electrode liquid preparation tank (27). The negative electrode conveying tank (36) intermittently moves vertically to and fro for the transportation of negative electrode suspension solution between the negative electrode liquid collection tank (35) and the negative electrode liquid preparation tank (32). The circuit combination of several battery sub-systems is in series connection. The Pump-free lithium ion liquid flow battery provided in the present invention can reduce mechanical losses and security risks, improve battery working efficiency and ensure better safety performance.

The invention provides a lithium ion redox flow battery reactor. The lithium ion redox flow battery reactor comprises a bipolar diaphragm, a positive electrode flow deflector and a negative electrode flow deflector, wherein the flow deflector is formed by multiple flowing channel ridges in a concentric-square-shaped frame; the flow deflector is divided into multiple parallel flow diversion channels by the flowing channel ridges; a liquid inlet and a liquid outlet are formed in the flow deflector frame corresponding to the two ends of each flow diversion channels; and the adjacent positive electrode flow deflectors or the adjacent negative electrode flow deflectors are communicated in series on the same side through communicating structures. According to the lithium ion redox flow battery reactor, each battery reaction cavity is equipped with a group of liquid inlets and liquid outlets, and the electrode suspension liquid communicating structure, so that electrode suspension liquid does not need to pass through a flow division cavity and a flow confluence cavity, instead, the electrode suspension liquid directly enters the electrode reaction cavity, so that the flow division cavity and the flow confluence cavity are eliminated, the consistency among the battery units is effectively improved, the battery performance is improved, and the structure of the reactor is greatly simplified.

The invention discloses a cable-type diversion lithium-ion flow battery reactor, belonging to the technical field of a lithium-ion flow battery. Flexible diversion cables are arranged among sandwiched composite structure layers of the lithium-ion flow battery reactor and arranged in parallel, interior battery short circuit caused by rigid stress of a plate-like structure diversion body on the sandwiched composite structure layers is avoided during diversion on an electrode suspension liquid, and when the cables are electronic conductors, the cables also can be used for connecting a porous electrode collection layer and a battery lug for electron conduction and collection.

The invention relates to the technical field of preparation of lithium ion batteries, particularly to a capacity grading method for specially-shaped lithium ion batteries. The method adopts large-current staged charging and sequentially comprises steps as follows: a first charging stage, a discharging stage and a second charging stage, wherein the charging current of the first charging stage is in a range of 2.0 C-6.5 C, and the charging current of the second charging stage is in a range of 2.0 C-6.5 C. The capacity grading method is relatively simple, the capacity pass percent of capacity grading is high, the performance is good, and the capacity grading time is greatly shortened, so that the capacity grading production input is reduced, and the production efficiency of the lithium ion batteries is improved.

The invention discloses a safety device for formation and sub-capacity of a lithium ion battery. The safety device comprises a cabinet, wherein at least a row of battery compartments are arranged in the cabinet; an opening is formed at the upper end of each battery compartment; each battery compartment consists of an internal insulation fireproof layer and an external stainless steel layer; the battery compartments are connected in series by shafts so as to form a battery compartment row; rotating shafts are arranged at two ends of the battery compartment row; the two ends of each rotating shaft penetrate through the side wall of the cabinet; and a battery locating mechanism for locating the battery is arranged at the upper end of each battery compartment. Due to the adoption of the battery compartments of a two-layer structure, the battery has good insulation effect on the outside; and the short circuit of the battery caused by inappropriate operation of an operator or other accidents is avoided. The battery compartments of the two-layer structure further have high anti-explosion capability; and due to the adoption of the rotating shafts of the battery compartments, the battery can rotate in multiple angles in a standing stage (which can improve the infiltration effect of electrolyte); and the battery does not need to be manually rotated one by one. Therefore, the production efficiency of a workshop is greatly improved.

The present invention provides a temperature control device of spaceflight power lithium ion battery, relating to lithium ion battery. The device resolves the problems that the adding material is difficult to keep uniform distribution in the phase change material under the conditions of drastic concussion, 10 times higher acceleration of gravity, space radiation, rotating around the heavenly body in a high speed when adding graphite and metal powder or chipping to reduce the battery set temperature, especially when the spacecraft is emitted, such as the settlement, clustering phenomena of the adding material play an important role in thermal conductivity, so as to shorten the life service of battery. The diathermal wire of the invention is mounted in the phase change material in longitudinal and transverse cross, the end of the diathermal wire is fixed in the inside wall of the casing or the outside wall of the single battery. The diathermal wire of the invention is provided in the phase change material lengthwise and widthwise under the condition of considering the gravimetric factor, capable of quickly transmitting heat, effectively reducing the temperature of the battery, reducing temperature difference between each single battery.

The invention discloses a lithium ion liquid flow battery system which comprises a battery module group, wherein the battery module group comprises a battery module or more than one serially connected battery module; each battery module comprises a battery sub module or more than one parallelly connected battery sub module; each battery sub module comprises at least two connected battery units. A liquid supply system of each battery module forming the battery module group is independent and adopts a positive electrode liquid storage device and a negative electrode liquid storage device respectively; liquid conveying pipelines are independent; each battery sub module is an independent whole capable of feeding and discharging liquid independently; all the battery modules in the battery module group share a dynamic circulating device; positive and negative electrode suspensions are driven by the dynamic circulating device to do periodic reciprocating flowing in a closed space consisting of the liquid storage devices, the liquid conveying pipelines and the battery modules.

The invention provides a ship emergency power source system based on solar power generation. According to the system, under good light conditions, a lithium battery pack is charged through a solar power generation device and inverted through a two-way photovoltaic inverter after being fully charged, and then the lithium battery pack is connected into a ship main electric network on a ship emergency switchboard (2); when the light conditions are poor or the solar power generation device fails, the ship main electric network is rectified through the two-way photovoltaic inverter and then used for charging the lithium battery pack to ensure the reliability of the lithium battery pack serving as a ship emergency power source; when the ship main electric network is powered off, failure of the ship main electric network is automatically detected through the system, and the emergency power source supplies electricity to emergency loads through the ship emergency switchboard to achieve energy conservation and emission reduction. While solar energy (clean energy) is used sufficiently, voltage stabilization and energy storage functions of lithium ion batteries in the system are brought into play, and not only are fuel consumption and exhaust emission reduced, but also a diesel oil emergency power generation unit can be replaced.

The present invention provides a lithium ion battery consistency screening method. The screening method at least comprises: testing the AC resistance of a battery after a liquid injection process, then performing a capacity grading test to obtain the capacity of the battery, and testing the AC internal resistance after the capacity grading; performing a self-discharge process on the battery afterthe capacity grading for still standing, and performing charging and discharging to obtain a discharge capacity of the battery; according to the AC resistance of the battery after the liquid injectionprocess, the capacity obtained by the capacity grading test, the AC internal resistance after the capacity grading, and the discharge capacity obtained by the charging and discharging, calculating acycle state value of the battery; and finally grouping the batteries according to the cycle state values to implement battery consistency screening. According to the method provided by the present invention, the capacity and the AC internal resistance of the lithium ion battery are obtained, and the cycle state value can be calculated through the formula, so that batteries with a similar cycle life can be screened out; and the method is simple in operation, the cycle life of the screened batteries has good consistency, and there is no damage to the battery.

The invention discloses a positive or negative suspension electrolyte for a flow battery and a preparation method of the positive or negative suspension electrolyte. The preparation method comprises the steps of screening and baking an active material, an additive and a conductive agent; adding the additive to an electrolyte for a lithium-ion battery to prepare a solution; adding the conductive agent to the solution to prepare a suspension liquid; and adding the active material to the suspension liquid to prepare a suspension electrolyte, from which particles of which the particle sizes are smaller than 400nm are screened and removed. The preparation method of the positive or negative suspension electrolyte for the flow battery has the advantages of being simple and easy to operate and suitable for massive production; by the preparation method disclosed by the invention, the suspension electrolyte suitable for a lithium-ion flow battery can be quickly prepared; and the prepared suspension electrolyte has the advantages of high conductivity, low viscosity and good suspension stability.

A lithium ion flow battery comprising cathode current collectors (21), an anode current collector (22), a cathode reaction chamber (24), an anode reaction chamber (25), a separator (23), a cathode suspension solution (26) and an anode suspension solution (27), wherein the cathode and anode current collectors are located at both sides of the separator respectively and are in close contact with the separator to form sandwich composite structure layers of the cathode current collector, the separator and the anode current collector; and in that several sandwich composite structure layers are arranged in sequence in an order that current collectors with the same polarity are oppositely arranged, and the electrode suspension solution continuously or intermittently flows in a battery reaction chamber between adjacent sandwich composite structure layers. Thus, the size of the battery reaction chamber can be flexibly designed according to the viscosity of the electrode suspension solution without increasing the polarization internal resistance of the battery, thereby solving the restriction conflict existing in the existing lithium ion flow battery between the size of the battery reaction chamber and the polarization internal resistance of the battery.

The present invention provides a lithium ion flow cell electrode suspension liquid and a preparation method thereof. The electrode suspension liquid comprises an electrode active material, an electrolyte, an electric conduction agent, and a vinylidene fluoride-hexafluoropropylene copolymer, wherein the electrolyte comprises a grinding aid, a solvent and a lithium salt. The method comprises: mixing an electrode active material and an electric conduction agent by using a grinding aid having high boiling point and high flash point to obtain a suspending slurry having uniform and coincident components, adding a solvent and a lithium salt to the suspending slurry, and adding a proper amount of an additive vinylidene fluoride-hexafluoropropylene copolymer according to the actual use requirement so as to effectively avoid the agglomeration of the solid particles in the electrode suspension liquid, slow down the particle sedimentation rate, and improve the quality stability of the electrode suspension liquid. According to the present invention, the electrode suspension liquid prepared by the method has advantages of uniform active material particle dispersing and stable quality, and can avoid the safety problem and the quality stability problem possibly caused by the direct application of the electrolyte to prepare the electrode suspension liquid.

The invention discloses a thermal management system with regional air cooling heat dissipation for a lithium-ion power battery pack. The system comprises a box body provided with an air inlet and an air outlet, wherein an upper separation board and a lower separation board which are parallel to each other and are provided with mounting holes are arranged in the box body; a plurality of single lithium ion batteries which are mutually parallel are vertically arranged in the box body. According to the thermal management system disclosed by the invention, a space between the box body and the single lithium ion batteries is divided into three regions which are basically identical; according to different heat productivities of different regions of the single lithium ion batteries, all the regions are cooled by adopting cooling air with different flow speeds, so that the maximum temperature of the lithium ion batteries can be effectively reduced, basically-identical temperature can be obtained by all the regions of the lithium ion batteries, the temperature difference of all the regions of the lithium ion battery pack is reduced, and the batteries are enabled to keep better consistency; meanwhile, energy consumption is reduced, and economic performance of the system is improved.

The invention discloses a lithium ion battery isolated in partition by using positive temperature coefficient (PTC) materials. The internal part of the lithium ion battery is divided into at least two capacity units; lugs which are arranged in different capacity units and have the same polarity extend and gather together to form an anode lug or a cathode lug of the lithium ion battery; and in theanode lug and/or the cathode lug, the lugs from different capacity units are mutually isolated by PTC material layers. The internal part of the lithium ion battery is divided into several small capacity unit areas by the PTC materials; when the battery is abused or destroyed to cause effect losing of the internal part, the local current is over high caused by short circuit in the internal part, and meanwhile, the temperature rises quickly; when the temperature reaches the working temperature of the PTC material, the resistance increases instantly to break the transmission path of the current so that the ineffective area is isolated, the speed of effect losing reaction is controlled, and more serious chain reactions can be avoided.

The invention relates to a battery heat management device, in particular to a lithium ion battery pack heat management device based on PTC resistance tape heating. According to the technical scheme, aluminum sheets (5) are respectively provided a plurality of grooves and are attached to the sides, with the largest superficial area, of lithium ion batteries (4), PTC resistance tapes (3) are embedded into the aluminum sheets (5) and wound around the surfaces of the lithium ion batteries (4), temperature acquisition units (6) are arranged on the single lithium ion batteries (4) to acquire temperature and report acquired temperature information to a battery slave control unit (8), and a battery main control unit (9) receives the temperature information reported by the battery slave control unit (8) to manage a power distribution unit (2) or issue a control signal of starting a fan (7) to the battery slave control unit (8). According to the lithium ion battery pack heat management device, the heating power can be conveniently adjusted, and the heating and heat dissipation integration level is high.