12results about How to "Mitigate capacity fading" patented technology

The present application belongs to the technical field of battery equalization device, especially relates to a lead-acid battery equalization device. The present application comprises: a processor module, a measurement battery selection module, a battery parameter storage module, an analog power supply module, a power module, a first charge-discharge circuit module, a second charge-discharge circuit module, and a communication module; the measurement battery selection module, the battery parameter storage module, the analog power supply module, the power module, the first charge-discharge circuit module, the second charge-discharge circuit module, and the communication module are respectively connected with the processor module; the processor module selects the first charge-discharge circuit module or the second charge-discharge circuit module through the measurement battery selection module to realize independent charge-discharge of single batteries; the first charge-discharge circuit module and the second charge-discharge circuit module sample and calculate the battery voltage in real time through the processor module to trigger the equalization operation. The present application is modularized and multi-node collaborative to realize precise charge-discharge control and real-time state monitoring.

The invention provides a negative electrode plate, a negative electrode plate preparation method and a battery, the negative electrode plate comprises a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material and a modified binder, the negative electrode active material comprises a silicon carbon material and a polar coating, and the polar coating coats the silicon carbon material; the modified binder comprises a binder precursor, and an epoxy compound is grafted on the binder precursor. According to the negative plate provided by the invention, the silicon-carbon material is coated with the polar coating, the negative plate can be tightly attached to the silicon-carbon surface by utilizing polar interaction, the volume expansion of the silicon-carbon material is inhibited in the cyclic charging and discharging process, and meanwhile, the modified binder grafted with the epoxy compound can be used for inhibiting the volume expansion of the silicon-carbon material through the strong interaction among the epoxy compound, the silicon-carbon material and the polar coating. According to the present invention, the structure loosening caused by expansion is inhibited, and the flexibility of the binder is optimized, such that the binder can adapt to the expansion and shrinkage of silicon carbon, and the shedding of the active material and the side reaction of the electrolyte during the circulation process are reduced so as to effectively alleviate the capacity fading and improve the cycle life.

The invention discloses a battery heat preservation control device and a control strategy. According to the technical scheme, the battery heat preservation control device is characterized by comprising a conventional battery pack, a bypass BMS, a low-temperature-resistant battery, a temperature control management module, a heating film and at least two paths of temperature sensors; the conventional battery pack comprises a main BMS (Battery Management System) and a main battery cell; the bypass BMS is electrically connected with the low-temperature-resistant battery, the bypass BMS is in communication connection with the temperature control management module, and the low-temperature-resistant battery supplies power to the temperature control management module and the heating film; the heating film is attached to the surface of the main battery cell, and the at least two paths of temperature sensors are respectively arranged at different positions of the main battery cell so as to monitor the temperature of the main battery cell. The system supplies power independently and does not consume the power of a main battery. The device is accurate in temperature control, improves the safety of the battery, avoids local overheating or insufficient heating, and improves the use safety of the battery.

The invention belongs to the technical field of flow batteries, and relates to an electrolyte containing a polyanionic electrolyte additive and a flow battery. Comprising a viologen compound, a supporting electrolyte, a solvent and a polyanionic electrolyte additive, the polyanionic electrolyte additive accounts for 0.1%-20% of the electrolyte in percentage by mass; molecules of the polyanionic electrolyte additive are rich in various functional groups with negative charges, and the polyanionic electrolyte additive is used for interfering the pi-pi accumulation behavior of viologen molecules; the polyanionic electrolyte additive is a polymer containing a repetitive unit, and is sodium polystyrenesulfonate, sodium polyacrylate, poly (2-acrylamido-2-methyl sodium propanesulfonate) or sodium alginate. By introducing a polymer carrying high-density negative charges in the structure or aggregated inorganic anions, multiple regulation and control effects on viologen molecules in a water-phase environment are realized, aggregation behaviors of reduced molecules of the viologen molecules are remarkably inhibited, and chemical and electrochemical stability of the electrolyte is improved.

This invention belongs to the field of battery technology and provides a lead paste for lead-carbon batteries' negative electrode based on inorganic additives to suppress hydrogen evolution. By weight fraction, it comprises: 100 parts lead powder, 0.1-0.15 parts carbon black, 0.08-0.15 parts graphene, 0.8-1.3 parts bismuth, 0.05-0.1 parts short fibers, 0.8-1 parts barium sulfate, 0.1-0.2 parts humic acid, 0.2-0.3 parts sodium lignosulfonate, 8-11 parts sulfuric acid solution, and 9-12 parts deionized water. This invention, by limiting the use of carbon materials and specifying the form of bismuth addition, suppresses the phenomenon of lead easily detaching during cycling due to changes in the deposition / dissolution crystallization habit, thereby delaying capacity decay.

This invention relates to the field of battery separator technology, and proposes a multilayer lithium battery separator, its preparation method, and its application. The multilayer lithium battery separator, from bottom to top, includes a base film and a composite layer; the composite layer includes a polyimide porous layer and a functional layer; the functional layer includes at least one of a thiophene polymer layer and a microcapsule particle layer. This technical solution solves the problem of low coulombic efficiency in lithium battery separators in related technologies.

The invention discloses a recyclable valve-regulated lead-acid storage battery, lead paste and a preparation method of the lead paste, and relates to the field of lead-acid storage batteries. The lead paste comprises positive lead paste and negative lead paste which both contain short fibers compositely modified by carboxylic acid and silane monomers, and key components such as stannous oxide, zinc oxide, carbon black and lignin are added. The modified short fiber has the functions of acid affinity and storage, sulfuric acid conduction and structure enhancement, and has a synergistic effect with each component, so that the conductivity, the structural stability and the reaction activity of the lead plaster are remarkably improved, and the problems of reduced charging acceptance, quick capacity fading and short cycle life of the existing lead-calcium alloy storage battery are solved. The method is suitable for power cycle use scenes such as electric bicycles and electric tricycles, the cycle life of the storage battery can be prolonged, and the capacity stability is improved.

The application belongs to the technical field of mobile charging equipment and relates to a compact charging vehicle body. The vehicle body comprises a frame body integrally welded and formed, which is internally provided with first-layer, second-layer and third-layer battery placing frame structures stacked in sequence from top to bottom. The bottom center of the third-layer battery placing frame structure is provided with a water-cooled cabinet storage frame structure for installing a water-cooling module to realize efficient heat dissipation. The frame body is provided on one side with an integrated energy conversion module placing frame structure for installing functional units. The bottom of the frame body is provided on both sides with fixing frames, and the frame body is connected with a foot pedal structure through a Z-shaped foot pedal connecting frame. The application solves the problems of large size and inconvenient movement of the existing mobile charging vehicle through a multi-layer stacking layout, modular integration and integrated welding structure, has the advantages of compact structure, light self-weight, good heat dissipation performance, convenient operation and maintenance and the like, and significantly improves the space utilization and environmental adaptability.

The application discloses a boehmite-coated diaphragm and a preparation process thereof in the field of lithium ion battery diaphragms, and the diaphragm raw materials comprise ultrapure water, a dispersing agent, boehmite, a thickening agent, butadiene styrene rubber, lithium acrylate, a wetting agent, a fluorine-siloxane-sulfonic acid group copolymer and a five-arm polyamide-polyphosphate star copolymer. The fluorine-siloxane-sulfonic acid group copolymer is prepared by polymerization of multi-monomers such as trifluoroethyl methacrylate, gamma-(methacryloyloxy) propyl trimethoxysilane and 2-acrylamido-2-methylpropane sulfonic acid. During preparation, the boehmite is mixed and ground with the dispersing agent, the thickening agent and the like to form a slurry, two kinds of modified copolymers and other functional components are added to adjust the performance, and after coating, drying and rolling, the coated diaphragm is formed. The synergistic effect of the two kinds of copolymers significantly improves the thermal stability, electrolyte wettability and interface bonding force of the diaphragm with the base film, effectively solves the comprehensive performance bottleneck of the traditional diaphragm, and is suitable for the field of high-performance lithium ion batteries.

The application relates to a preparation method and application of a wide-temperature-range sodium vanadium iron sulfate positive electrode material, and relates to a preparation method and application of a positive electrode material. In order to solve the problem of insufficient cycle stability of an existing sodium iron sulfate positive electrode material, the preparation method comprises the following steps: a sodium source, a vanadium source, an iron source, a sulfate and a carbon source are mixed according to a stoichiometric ratio, and ball milling treatment is carried out under a rotating speed of 300-600 r / min to obtain a precursor; the precursor is subjected to first-stage sintering at 150-200 DEG C, and then subjected to second-stage sintering at 650 DEG C to obtain a NaVFe(SO4)3 positive electrode material with a carbon-coated structure. Through optimization of a ball milling process and a segmented sintering system, the crystallinity and structural integrity of the material are effectively improved, the prepared NaVFe(SO4)3 positive electrode material is uniform in particle size, the carbon-coated layer is complete, and the material exhibits excellent structural stability, high-rate performance, wide-temperature-range performance and significantly improved energy density. The application belongs to the technical field of secondary battery electrode materials.

The invention belongs to the field of electric power, and discloses a fire-storage combined frequency modulation control method and device based on double closed-loop optimization, and the method comprises the steps: carrying out the prediction of a load instruction of a fire-storage combined system in a future time period through a load prediction model in response to a collected AGC instruction signal, a load prediction model is constructed based on variational mode decomposition and bidirectional long-short-term memory network fusion; inputting the predicted load instruction and the actual load instruction into a third-order frequency modulation demand calculation model, and calculating the frequency modulation power demand of the thermal power storage combined system; according to a chaos quantum particle swarm optimization algorithm, with comprehensive minimization of the adjustment cost, the frequency modulation deviation and the energy storage life loss of the thermal power and energy storage combined system as a target, optimal output distribution between the thermal power generating unit and the energy storage system is carried out on the frequency modulation power demand; and evaluating the health degree of the energy storage system in the thermal power storage combined system based on the capacity attenuation mechanism, and adjusting the weight or constraint condition of the optimization target in the chaotic quantum particle swarm optimization algorithm according to the health degree.

The invention provides a vehicle charging control method and system and a vehicle, and the method comprises the steps: obtaining multi-source heterogeneous data of the vehicle, the multi-source heterogeneous data comprising user scene data, vehicle travel data and battery reference state data; respectively inputting the multi-source heterogeneous data into a pre-trained parking time length prediction model and a pre-trained travel demand prediction model, and correspondingly obtaining an expected available charging time length and an estimated minimum required electric quantity; constructing a constraint condition based on the expected available charging duration and the estimated minimum required electric quantity, and solving to obtain a charging power sequence by taking the minimum cumulative aging cost as an optimization target; and executing the charging power sequence to control a charging process of the vehicle. According to the method, the minimum estimated cumulative aging cost is taken as an optimization target, and the stress and aging of the battery in the high charge state can be remarkably reduced, so that the full life cycle of the battery system is prolonged.