948 results about "Discharge efficiency" patented technology

The invention belongs to the technical field of power systems, and particularly relates to an audit data early warning method and system, and the method comprises the steps: collecting the node voltage and current of a power supply network and the charging and discharging efficiency data of an energy storage system in real time through a distributed sensor network, and generating an original data flow; carrying out localized cleaning and standardized format conversion through an edge computing node; generating a dynamic risk assessment result and a scheduling scheme based on fuzzy logic reasoning and digital twinborn simulation; and analyzing and predicting deviation through meta-learning, and realizing closed-loop optimization by adopting a model distillation technology. The system comprises a distributed sensor network, an edge computing node, a multi-source data fusion module and the like. According to the method, the anomaly detection real-time performance, the risk assessment accuracy and the energy storage scheduling economy of the power system are improved.

Disclosed is a battery health state assessment method, including performing discharge control on a cell until a cutoff voltage; performing charge control on the cell until a preset cell load rated capacity, and performing discharge control on the cell until the cutoff voltage, and generating cell discharge efficiency information; performing charge and discharge cycle control on the cell and acquiring corresponding charge and discharge cycle control efficiency information; using a cell load algorithm to calculate and generate a cell load actual capacity information; and generating a cell health state assessment information according to the ratio between the cell load actual capacity and the cell load rated capacity. The accuracy of the SOH assessment process can be improved by implementing the methods of the embodiments of the present application to optimize the battery performance assessment process and improve the battery charge and discharge efficiency assessment capability.

The invention relates to a photovoltaic power grid energy storage optimization regulation and control method based on multi-scale prediction. The method comprises the following steps: A1, obtaining historical power generation data, real-time meteorological data and numerical weather forecast of a photovoltaic power station; a2, generating a multi-time-scale photovoltaic output prediction sequence; a3, establishing an energy storage dynamic model of charge and discharge efficiency, capacity attenuation and operation constraint; a4, generating an energy storage charging and discharging demand curve under different time scales; a5, constructing a multi-time scale coupled optimization model by taking power grid operation cost minimization and renewable energy consumption maximization as targets; a6, updating an energy storage scheduling instruction in a rolling manner based on latest prediction data by adopting a model prediction control framework; a7, monitoring the deviation between the actual photovoltaic output and the power grid load, and dynamically adjusting the energy storage charging and discharging power; and A8, correcting a prediction error through Kalman filtering and a closed-loop feedback mechanism. According to the invention, high-efficiency operation can be realized, and power grid cost minimization and renewable energy consumption maximization can be realized.

The invention discloses a dispersed transformer cooling system and method, and relates to the technical field of transformers, integration supporting rods are mounted on the inner side of a transformer integration box through fixing bolts, a treatment transformer box is welded to the top ends of the two integration supporting rods, a hollow supporting rod is clamped to the inner side of the treatment transformer box, and a transformer core is mounted at the top end of the hollow supporting rod; the device effectively solves the problems that in the prior art, due to the fact that oil cannot circulate, heat is concentrated at the position of a transformer core, the internal temperature cannot be homogenized, only external air cooling treatment is conducted, the heat removal efficiency is poor, meanwhile, oil overflow and oil liquid level control are utilized, and the heat removal efficiency is poor. And the heat exchange area is increased, and the influence of oil on the operation environment and the operation stability is avoided, so that the heat exchange area is increased, the heat exchange speed is increased, the overall temperature is balanced, and stable operation treatment of the transformer is realized.

The invention relates to the technical field of battery positive electrode materials, and provides a lithium iron phosphate positive electrode material and a preparation method thereof. The lithium iron phosphate positive electrode material has the characteristic of high energy density, the proportion of iron phosphide impurities in the total mass of the lithium iron phosphate positive electrode material is 0.001-0.008 PPM, the compaction density under the pressure of 3T is 2.68-2.8 g / cm < 3 >, the powder resistivity is 8-15 omega.cm, the 0.1 C discharge capacity is 161-163 mAh / g, the 0.1 C charge-discharge efficiency is 98.5-100%, and the 1C discharge capacity is 145-148 mAh / g. The preparation process is simple and safe, low in cost and high in stability. The content of iron phosphide impurities in a final lithium iron phosphate product can be regulated and controlled by regulating and controlling the phosphorus-iron ratio of the iron phosphate precursor and the ratio of the carbon source to the iron phosphate precursor in two-time burdening and controlling the sintering temperature in cooperation with secondary sintering, and the high-energy-density lithium iron phosphate positive electrode material is obtained.

The invention discloses a power supply intelligent management system of an AGV trolley, and relates to the technical field of intelligent management, during operation of the system, data monitoring is performed through various sensors, measuring equipment and a battery management system BMS, and internal resistance data, battery capacity attenuation conditions and battery charging and discharging conditions of a battery of the AGV trolley are acquired in real time; the battery health index is comprehensively calculated through the battery internal resistance coefficient, the battery capacity attenuation coefficient and the battery charging and discharging efficiency coefficient, the output power of the battery is dynamically adjusted, the charging and discharging process of the battery is automatically adjusted according to data collected in real time and a load evaluation result, and intelligent scheduling is achieved according to needs. By analyzing the health data, the charging and discharging behaviors and the working environment of the battery, the battery fault is predicted in time, automatic fault detection and early warning are supported, system shutdown or performance reduction caused by the battery fault is avoided, an interactive interface between a user and the system is provided, and remote monitoring and control are supported at the same time.

The invention discloses a wind and light storage and charging micro-grid distribution optimization method and system. The method comprises the following steps: acquiring parameter data of each node in a micro-grid in real time; constructing a load demand prediction model, and automatically adjusting the scheduling weight coefficient of the wind and light storage and charging equipment according to the weather type; based on a model output result, establishing a matching relationship between the line impedance and the load emergency degree, generating a power supply path set, and creating a power path selection mechanism based on a dynamic planning algorithm; calculating real-time charge-discharge efficiency based on the equivalent resistance parameter of the power supply path, and dynamically adjusting a charge-discharge rate threshold according to a prediction error; acquiring a real-time monitoring load curve, calculating the similarity between the load curve and historical data, and matching and identifying a potential sudden change risk; and according to a distributed negotiation protocol, each node achieves a scheduling consensus through a priority broadcasting mechanism. The method has the advantages that through load prediction and dynamic scheduling, optimal scheduling, power fluctuation stabilization and sudden change risk identification of the wind and light storage and charging equipment are realized.

The present invention discloses a formation method for a sodium-ion single battery, which includes constant current charging of the sodium-ion single battery at a charging rate of 0.1C - 0.5C under the condition of 20 - 25°C, and the charging cut-off voltage is V C1 and standing still for 30 - 60 minutes, placing the single battery under the condition of 2 - 10°C for 1 - 2 h, and using voltage V C2 to perform constant voltage charging for 2 - 5 seconds and then standing still for 3 - 8 seconds, standing still for 30 - 60 minutes under the condition of 20 - 25°C, and performing constant current discharging of the sodium-ion single battery at a discharging rate of 0.1C - 0.5C, and the discharging cut-off voltage is V D1、 placing the single battery under the condition of 35 - 55°C for 1 - 2 h, and using voltage V D2 to perform constant voltage discharging for 3 - 6 seconds and standing still for 5 - 8 seconds. The formation method of the sodium-ion single battery significantly changes the performance of the sodium-ion battery, effectively improving the first capacity, charge and discharge efficiency, and cycle life of the sodium-ion battery.

The invention provides a communication master control system based on intelligent power supply, and relates to the technical field of communication, and the system comprises a power supply monitoring module which is used for monitoring the commercial power supply state of a communication base station, and automatically controlling a power switching circuit to switch a power supply mode to a standby battery power supply mode when the commercial power interruption is detected; the state acquisition module is used for acquiring the charge state, the discharge efficiency and the health state data of the standby battery in real time in a standby battery power supply mode, and acquiring the residual capacity, the actual discharge capacity and the life index of the battery; and the load receiving module is used for uploading the residual capacity, the actual discharge capacity and the life index of the battery to the communication main control unit, and receiving load data in the current communication network at the same time. According to the invention, intelligent scheduling of power utilization is realized, and the power supply reliability and stability of the communication system are improved.

The invention relates to the technical field of lithium batteries, in particular to a carbon nanotube modified lithium manganese iron phosphate material, application and a preparation method. The method comprises the following steps: mixing a solution containing lithium, phosphorus, iron and manganese with carbon nanotubes, heating to obtain lithium manganese iron phosphate powder, and sintering to generate the carbon nanotube modified lithium manganese iron phosphate material in situ. According to the method, the lithium manganese iron phosphate positive electrode material is generated in situ by utilizing the excellent conductivity of the carbon nanotubes, and the carbon nanotubes can form a uniform conductive network, so that the internal resistance of the material is remarkably reduced, and the charge-discharge efficiency of the material is improved; the method is simple in preparation process, uniform in obtained material structure, low in production energy consumption and raw material cost and suitable for large-scale industrial production.

The invention belongs to the technical field of hydrogen storage equipment, and discloses vertical dividing wall type solid hydrogen storage equipment which comprises a high-temperature steam conveying pipe, one end of the high-temperature steam conveying pipe is connected with a plurality of steam auxiliary pipes, and the other end of each steam auxiliary pipe is connected with a solid hydrogen storage tank through a steam pipe connector. The top of each solid hydrogen storage tank is connected to a hydrogen pipe through a hydrogen charging and discharging port, a steam layer is further arranged at the top of each solid hydrogen storage tank, and a steam output pipe is connected to the bottom of each steam layer. High-temperature steam generated by a power plant is mainly used for heating the solid hydrogen storage tank; the solid hydrogen storage material is preferably magnesium-based solid hydrogen storage alloy, the interior of the solid hydrogen storage tank has an efficient heat transfer effect, the adopted spiral fins and the solid hydrogen storage tank are well fixed, and the spiral fins are beneficial to the heat transfer and mass transfer process of the solid hydrogen storage material; and the inner pipe, the sprue spreader and the dividing wall layer are matched to heat the liner internally and externally at the same time, so that the hydrogen absorption and desorption efficiency of the solid hydrogen storage tank is improved.

The invention relates to the technical field of energy storage, and discloses a charge-discharge control device and method for a flow battery, and the device comprises a circulation mechanism which is used for storing and transporting positive and negative electrolyte, and is also used for realizing ion transfer by using a diaphragm or an ion exchange membrane, so as to realize charge-discharge operation; the flow slowing mechanism is arranged on the periphery of the circulating mechanism and is used for adjusting the flow velocity and the flow of the positive electrode electrolyte and the negative electrode electrolyte when being continuously extruded, so that the charging and discharging efficiency of the battery is adjusted; and the adjusting mechanism is arranged on the outer side of the flow slowing mechanism and is used for automatically controlling the extrusion degree of the flow slowing mechanism so as to automatically adjust or stop the flow velocity and flow of the positive and negative electrolyte. According to the invention, through precise flow rate regulation and control, intelligent charging and discharging management and multi-level fault monitoring, battery charging and discharging efficiency improvement, energy optimization management and safe and stable operation and remote intelligent operation and maintenance of the system are realized.

The invention discloses an island microgrid distributed energy storage locating and sizing method and device based on data driving. The method comprises the following steps: acquiring a power generation power prediction value of each photovoltaic unit and a load power prediction value of each load node; determining the island power supply gap, the full life cycle cost and the energy storage charge and discharge efficiency of the micro-grid; giving out constraint conditions of operation of the micro-grid; constructing an island micro-grid simulation model based on the constraint condition of micro-grid operation; constructing a multi-objective optimization function based on the island power supply gap, the full life cycle cost and the energy storage charge and discharge efficiency of the micro-grid; and in combination with the analysis of the island microgrid simulation model and the multi-objective optimization function, giving the site selection and capacity of each energy storage unit to be configured. According to the method, a source-load uncertainty rule and time-space correlation characteristics are directly learned from historical data, distributed energy storage locating and sizing are guided, actual operation characteristics of an island microgrid are accurately matched, and reasonable configuration of an energy storage unit is achieved.

The invention relates to the field of positive electrode materials, in particular to a graphene reinforced lithium iron phosphate material and a preparation method and application thereof. According to the positive electrode material, europium ions are doped into lithium iron phosphate, the europium ions are large in radius, a larger migration channel is provided for lithium ions, meanwhile, the binding energy of the lithium ions can be reduced, the surface of the europium-doped lithium iron phosphate is coated with carbonized hydroxyethyl methyl cellulose grafted graphene, the hydroxyethyl methyl cellulose reduces the agglomeration phenomenon of the graphene, and the conductivity of the lithium iron phosphate is improved. After carbonization, a 3D conductive carbon network is jointly formed with graphene, so that the electronic conductivity is enhanced; the positive electrode material has the advantages of long cycle life, high charge-discharge efficiency, high conductivity and high cycle stability, provides a good energy storage basis for batteries, and is suitable for the fields of power batteries and energy storage.

The present application provides a charge-discharge method and an energy storage system for an energy storage system. The method includes: predicting based on the collected photovoltaic data to obtain a first photovoltaic power, and predicting based on the collected load data to obtain a first load power; determining a reserved power based on the first photovoltaic power and the first load power, where the reserved power is a standby power set to ensure the stable operation of the energy storage system; and determining a charge-discharge strategy based on the reserved power and one or more preset targets. The method provided by the present application helps to improve the charge-discharge efficiency, reduce the operating cost, and improve the economic benefit.

The invention provides high-energy-storage-density strontium barium calcium niobate / CaAl2Si2O8 dielectric composite ceramic and a preparation method thereof, belongs to the technical field of composite ceramic materials, and aims to solve the technical problem of low energy storage density of composite ceramic. According to the invention, high-entropy ceramic is combined with a second phase composite technology to enhance the energy storage characteristic of strontium barium calcium niobate dielectric ceramic, Sr < 1 / 3 > Ba1 / 3 > Ca < 1 / 3 > Nb < 1-0.2 x > Zr < 0.2 x > Mg < 0.2 x > Ti < 0.2 x > Hf < 0.2 x > Ta < 0.2 x > O < 3 > nano powder is prepared by a microwave sol-gel method, and the strontium barium calcium niobate / CaAl < 2 > Si < 2 > O < 8 > dielectric composite ceramic is prepared by a spark plasma sintering method. The composite dielectric ceramic prepared by the invention has relatively high breakdown-resistant field strength, relatively high dielectric property, energy storage density and good discharge efficiency, the breakdown-resistant field strength reaches 850kV / cm, and the maximum energy storage density reaches 8.23 J / cm < 3 >.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a preparation process of a silicon-carbon coated negative electrode material which takes bamboo wood as a biomass carbon source and is combined with nano silicon and a dual carbon coating technology, and the preparation process comprises the following steps: step a, sol loading, step b, vacuum impregnation, step c, interface bonding, step d, inner layer coating and step e, outer layer coating. A silicon-carbon interface in-situ bonding technology and a double-layer carbon coating technology are utilized, a sol-gel method is adopted to construct a Si-O-C chemical bond on the surface of bamboo-based carbon, molecular-level anchoring of silicon particles (20-50 nm) on the surface of a carbon skeleton is achieved, the interface separation problem of traditional mechanical mixing is solved, meanwhile, inner-layer amorphous carbon (2-3 nm) is generated in cooperation with bamboo wood pyrolysis gas, and the surface of the bamboo-based carbon is separated. Then bamboo vinegar is carbonized to form an outer graphitized carbon shell (5-8nm), and the double carbon layers cooperate to inhibit volume expansion of silicon, so that the problem of volume expansion of silicon is solved, and the first charge-discharge efficiency of the battery and the capacity retention rate after circulation are effectively improved.

The invention relates to the technical field of power supply control, and discloses a charging and discharging control method and device for energy storage equipment, and the method comprises the steps: obtaining the state data of a battery pack in real time through an acquisition module, converting the state data into characteristics of SOC, SOH and the like, analyzing the overall distribution and time trend of the state characteristics of the battery, extracting the state characteristics of a power supply, and evaluating the state characteristics of the power supply. A safety control strategy is generated and implemented, charging and discharging stages are divided, a control strategy is formulated and a charging and discharging strategy is optimized, the safety and reliability of energy storage equipment are improved, the charging and discharging efficiency is optimized, the service life of a battery is prolonged, intelligent management of data driving is achieved, and the operation cost is reduced. The problem of high cost of separately controlling each battery pack of a power supply in the prior art is solved.

The invention relates to the technical field of battery negative electrode materials, and discloses a biomass derived carbon material as well as a preparation method and application thereof. The surface of the biomass derived carbon material is loaded with nano-clusters or nano-particles of a metal simple substance or a metal compound. The preparation method comprises the following steps: mixing a biomass precursor and a metal salt, and carrying out one-step pyrolysis to obtain the biomass derived carbon material. The biomass derived carbon material can be used as an alkali metal ion battery negative electrode material. Through the unique technical means of loading the metal simple substance / metal compound with the nano-cluster or nano-particle form on the surface of the biomass charcoal, the fast charging performance of the negative electrode material is practically and effectively improved. The battery prepared from the negative electrode material shows excellent comprehensive performance, and has excellent key performance indexes such as charge-discharge efficiency, cycle stability and energy density.

The invention relates to the technical field of battery management, and particularly discloses a lithium ion battery cycle performance improving method based on multi-feature analysis. Key parameters of capacity, internal resistance, charge and discharge efficiency and temperature fluctuation of a battery are monitored in real time; according to the method, the electrolyte decomposition risk can be accurately evaluated and early warning can be provided by utilizing the advanced algorithms such as dynamic time warping, Kalman filtering, fast Fourier transform and Haar wavelet transform to calculate corresponding characteristic values and combining a gradient boosting decision-making tree and a machine learning model of a support vector machine, and once the potential risk is detected, the risk of electrolyte decomposition can be accurately evaluated and early warning can be provided. The system automatically starts the PID controller to precisely regulate and control the charging and discharging process and the temperature, it is ensured that the battery operates under the optimal condition, the comprehensive monitoring and regulation and control mechanism effectively prevents potential safety hazards such as electrolyte decomposition, the service life of the battery is remarkably prolonged, and the overall safety of the system is improved.

The invention provides a multi-energy collaborative grid-connected system containing roof photovoltaic, charging piles and energy storage cabinets. The multi-energy collaborative grid-connected system comprises a data acquisition module, a data processing module, a prediction module, an energy management strategy module, an execution control module, a user interface module and a safety management module. Through a prediction model driven by real-time data and a rolling optimization strategy, the system can quickly respond to photovoltaic power generation fluctuation and load change, the energy scheduling precision is remarkably improved, the time-of-use electricity price characteristics are combined, low-price electricity is fully utilized for energy storage and charging in the low ebb period, high-price electricity dependence is reduced in the peak period, meanwhile, the energy storage and charging and discharging efficiency is optimized, and the energy storage and charging efficiency is improved. And multi-energy collaborative management realizes maximum consumption of photovoltaic power generation, optimization of energy storage charging and discharging efficiency and reasonable power distribution of the charging pile, and the overall energy utilization rate is improved.

The invention relates to a desolventizing layer modified silicon-carbon negative electrode and a preparation method, the desolventizing layer modified silicon-carbon negative electrode comprises a silicon-carbon negative electrode, the silicon-carbon negative electrode comprises porous carbon mainly comprising mesopores and a silicon substrate attached in the pores of the porous carbon, and the desolventizing layer is covered on the surface of the silicon-carbon negative electrode. The desolventizing layer is an oxide of an amorphous active metal and a composite oxide of the amorphous active metal and lithium, the desolventizing layer at least covers the surface of the silicon substrate in the pores of the porous carbon, the desolventizing layer is made of amorphous titanium oxide, lithium titanate, niobium oxide, lithium niobate and titanium niobate, and after the electrolyte permeates into the pores of the porous carbon, the surface of the silicon substrate is coated with the desolventizing layer. And the lithium ions subjected to desolvation through the desolvation layer are alloyed with a silicon substrate. And the structural stability, the charge-discharge efficiency and the rate capability of the silicon-carbon negative electrode material are improved.

The invention relates to an optimal scheduling method and system for participation of actual energy storage and virtual energy storage in a power market, and a medium. The method comprises the steps of collecting user historical load, historical spot transaction price and local medium and long term transaction time-of-use electricity price data; predicting the user total load, the virtual energy storage capacity and the local day-ahead electric power spot transaction price in the next day; constructing a hybrid energy storage model based on the actual energy storage physical property parameters; the minimum user operation cost is set as an optimization target, and constraint conditions are set according to the actual energy storage capacity, the virtual energy storage capacity, the battery charging and discharging efficiency, the transformer capacity and the like; and a genetic algorithm is adopted to obtain a 24-hour actual energy storage and virtual energy storage collaborative scheduling strategy in the next day. According to the method, through accurate load, schedulable capacity and price prediction, the optimization algorithm is adopted to carry out collaborative optimization of actual energy storage and virtual energy storage, and the economic benefit and flexibility of the whole system are remarkably improved.

The invention discloses a cylindrical battery and a battery pack. The cylindrical battery comprises: a housing having an opening formed at one end in the axial direction thereof; the electrode assembly is arranged in the shell; the cover plate is installed on the opening in a sealed mode, and the cover plate comprises a first weak structure; the switching piece is arranged between the electrode assembly and the cover plate, the switching piece comprises a first switching part and a second switching part, the first switching part is electrically connected with a tab of the electrode assembly, and the second switching part is fixed and electrically connected with the shell; a second weak structure is arranged on the first adapter part; the calculation formula of the radius R of the second weak structure is shown in the specification. The final position of the second weak structure is determined through a calculation formula, at least part of the second weak structure does not fall into the area where the pressure relief part is located after deformation, then the second weak structure is supported by the edge of the fixing part so as to be prone to deformation, and therefore the beneficial technical effects of improving safe pressure relief and discharging efficiency and stability of the anti-explosion valve are achieved.

The invention discloses a manganese iron oxalate precursor, a lithium manganese iron phosphate material and a preparation method and application of the manganese iron oxalate precursor and the lithium manganese iron phosphate material, and belongs to the technical field of battery materials. The lithium manganese iron phosphate material core layer is prepared by taking the oxalate manganese iron precursor with a specific particle size range, particle size distribution uniformity and a specific structure as a raw material, and meanwhile, the shell layer comprising the ionic conductive agent and carbon is introduced outside the core layer, so that the comprehensive performance of the lithium manganese iron phosphate material can be effectively improved; and thus, the capacity, the cycle performance and the first charge-discharge efficiency of the prepared corresponding secondary battery are improved.

The invention discloses an aggregation scheduling method and device for adjustable resources, and belongs to the field of power scheduling, and the method comprises the steps: constructing a generalized energy storage model of each adjustable resource; clustering all adjustable resources according to the battery energy dissipation rate and the charging and discharging efficiency to obtain a plurality of polymers; solving a target translation factor of each adjustable resource in each polymer in each time section by taking the maximum space of the translated resource feasible region as a target and combining the transformation constraint of the feasible region; constructing a polymer feasible region constraint according to the generalized energy storage model and the target translation factor; the maximum new energy consumption is taken as a target, the polymer feasible region constraint and the power balance constraint are combined, the response power of each polymer is generated, and day-ahead scheduling is carried out according to the response power of each polymer. By implementing the method and the device, the demand response potential of the adjustable resources can be fully played, so that the problem that the response feasible interval of each resource cannot be accurately reflected when the adjustable resources are aggregated in the prior art is solved.

The invention discloses a power distribution network voltage regulation and control method fusing energy storage thermal management load, and the method comprises the steps: carrying out the analysis of an energy storage power station at different environment temperatures, quantifying the influence of different environment temperatures on the operation performance of the energy storage power station, and determining the optimal working temperature interval of the energy storage power station; analyzing an internal heat energy source of the energy storage power station, and constructing an energy storage power station heat management model based on a heat management load based on the optimal working temperature interval of the energy storage power station; based on the thermal management model of the energy storage power station, taking minimization of total operation cost as a target function, and constructing a power distribution network voltage comprehensive regulation and control model fusing the thermal management model of the energy storage power station and multi-device coordinated regulation and control; and solving the comprehensive voltage regulation and control model of the power distribution network, obtaining an optimal voltage regulation and control strategy, and realizing voltage regulation and control of the power distribution network. According to the invention, the optimal working temperature of the battery can be ensured under extreme climate (such as high temperature or low temperature), so that the charge-discharge efficiency and charge-discharge performance of energy storage equipment are improved.

The invention discloses a novel electric power-oriented energy storage double-layer optimization configuration method and system, and the method comprises the steps: S1, constructing an energy storage system model, defining the static parameters of energy storage, including rated capacity, rated power, charge and discharge efficiency, initial charge state and the like, and further quantifying the supporting capability of energy storage for the dynamic stability of the system, therefore, the enhancement effect of energy storage on frequency stability and small interference stability is directly reflected. According to the method, the system dynamic stability index, the green energy consumption index and the market economic index are uniformly incorporated into an energy storage optimization configuration framework, so that the limitation of single target of a traditional method is overcome, and a key technical support is provided for constructing a safe, green and economic novel power system; secondly, market price and risk constraints based on probability prediction are introduced into a lower-layer operation model, so that an energy storage operation strategy obtained through optimization can effectively cope with market fluctuation, the stability of earnings is guaranteed while high earnings are pursued, and the anti-risk capability of investment decision making is enhanced.

The invention provides a positive electrode precursor, a preparation method of the positive electrode precursor, a positive electrode material and a preparation process of the positive electrode material. The positive electrode precursor comprises a phosphorus-doped seed crystal, a phosphorus-doped layer coated outside the phosphorus-doped seed crystal, and a zirconium-rich shell layer coated outside the phosphorus-doped layer, and the mass fraction of doped phosphorus in the phosphorus-doped seed crystal is greater than the mass fraction of doped phosphorus in the phosphorus-doped layer. In the positive electrode precursor provided by the invention, due to introduction of gradient concentration doping of phosphorus, separation of lattice oxygen and mixed arrangement of cations are inhibited, the structural stability of the positive electrode material is enhanced, and the risk that the positive electrode material generates microcracks in the circulation process is reduced; in addition, due to the coating of the zirconium-rich shell layer, not only is the residual alkali reduced, but also the corrosion resistance and the stability of the positive electrode precursor are improved; therefore, the battery prepared from the positive electrode precursor provided by the invention shows relatively high first charge-discharge efficiency and rate capability and excellent cycle stability.

The invention discloses a high-compaction lithium iron phosphate positive electrode material and a preparation method thereof, and particularly belongs to the technical field of lithium ion batteries. The preparation method of the high-compaction lithium iron phosphate positive electrode material comprises the following steps: carrying out pre-reaction on a lithium source, a phosphorus source, an iron source and a cationic dispersant, then selecting a proper silane coupling agent and a proper carbon source, carrying out ball milling and blending, and finally sintering to obtain the high-compaction lithium iron phosphate positive electrode material. The prepared lithium iron phosphate positive electrode material has excellent electrical performance indexes, and shows excellent effects in the aspects of compaction density, low-rate discharge specific capacity, first charge-discharge efficiency, high-rate discharge specific capacity and cycling stability. The lithium iron phosphate positive electrode material provided by the invention is simple in preparation process, easy to implement and suitable for large-scale production, and meanwhile, proper types of dispersants and carbon sources are selectively added in the preparation process, so that a collaborative optimization effect is achieved.