8120 results about "Power battery" patented technology

The application relates to a method of fabricating micro fuel cells and membrane electrode assemblies by thin film deposition techniques using a dimensionally stable proton exchange membrane as a substrate. The application also relates to membrane electrode assemblies and fuel cells fabricated in accordance with the method. The method includes the steps of successively depositing catalyst, current collector and flow management layers on the membrane substrate in predetermined patterns. Since the fuel cell is formed layer by layer, the need for assembly and sealing of discrete components is avoided. The method improves the contact resistance between the current collectors and catalyst layers and reduce ohmic losses, thereby avoiding the need for end plates or other compressive elements. This in turn reduces the overall thickness of the manufactured fuel cell. Since the fuel cell layers are optionally flexible, the devices may be fabricated using a continuous roller process or other automated means. The method minimizes production costs and costs of non-essential materials and is particularly suitable for low power battery replacement applications.

The invention relates to a thermal management system of a power battery, and belongs to a component of a battery management system. The thermal management system of the power battery mainly consists of a battery box, a heat pipe, a liquid flow pipe, a liquid box, a semiconductor heating/refrigerating element, a liquid circulating pump, a battery control unit, a temperature sensor, a radiator and a fan. The radiator and the fan are installed outside the battery box, the battery box, the heat pipe, the liquid flow pipe, the liquid box, the semiconductor heating/refrigerating element, the liquid circulating pump, the battery control unit and the temperature sensor are installed in the battery box and organically combined with a battery module. The heat pipe is inserted into the battery module. The heat pipe is compactly attached to the battery module and the liquid flow plate above the battery module. The liquid flow plate is internally provided with a liquid circulating pipeline connected with the liquid circulating pump which is further connected with the liquid box filled with a circulating liquid. The semiconductor heating/refrigerating element is contacted with the liquid box and attached to the radiator. The battery box is further provided with the temperature sensor connected with battery control unit which controls the liquid circulating pump, the semiconductor heating/refrigerating element and the fan to work. The thermal management system of the power battery provided by the utility model is reasonable in structure and can quickly heat and cool.

The invention discloses a battery management system of a vehicle-mounted lithium power battery. The system includes a master control unit and slave control units. The master control unit is in communication connection with the multiple slave control units through a data bus. The master control unit is in connection with battery groups, the total voltage and total current of which are acquired. The master control unit is also connected to a DC power supply, and is in connection with a charger through an external CAN bus. The master control unit mainly includes: a master microcontroller module, a total voltage detection module, a total current detection module, a battery system insulation detection module, a battery operating environment temperature detection module, a relay driving module, a data storage module, a bus communication module, an isolated power supply module, and a physical interface module of power supplies, data, signals, etc. The system provided in the invention has the advantages of simple structure, strong expansibility, and adaptability to different numbers of batteries. Being fully functional, the system has the functions of temperature control, equalization processing, battery performance evaluation, and battery self-protection, etc.

The invention discloses a range extended electric vehicle control system, and relates to a whole vehicle control system. The range extended electric vehicle control system comprises an engine controlled by the conventional throttling valve, a generator which is integrally connected with a crank shaft of the engine and has functions of generating power and driving, a vehicle-mounted power battery, a whole vehicle controller, a range extender controller, a battery management system, a battery direct current sensor, an engine controller unit, a generator controller unit, a generator end direct current sensor and a permanent magnet synchronous driving motor, wherein the permanent magnet synchronous driving motor, the power battery and the generator are connected to a power line and used for driving wheels, a motor controller, a motor direct current sensor, the throttling valve and a crank shaft position sensor; the range extender controller communicates with the engine controller unit and the generator controller unit and sends a control instruction; and the range extender controller manages power generation energy and controls an auxiliary system according to a demand of a driver and a state of a range extender system. The invention also discloses a range extended electric vehicle control method. The range extended electric vehicle control system and the range extended electric vehicle control method can be used for electric automobiles.

The invention discloses a large-capacity high-power polymer lithium iron phosphate power battery. The weight ratio of anode slurry is as follows: 81 to 85 percent of lithium iron phosphate, 1 to 5.5 percent of superconduction carbon, 0 to 2.5 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 0 to 2.5 percent of crystalline flake graphite, 0 to 2 percent of carbon nanometer tube as well as 6 to 7.5 percent of polyvinylidene fluoride; the weight ratio of cathode slurry is as follows: 89 to 91 percent of cathode material, 1 to 3.5 percent of superconduction carbon, 0 to 2 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 2.5 to 3.5 percent of styrene-butadiene rubber as well as 1.5 to 2 percent of sodium carboxymethyl cellulose; the steps for preparing the battery are as follows: preparing slurry, coating the anode and the cathode, rolling and pressing a polar plate, transversely and separately cutting the polar plate, baking the polar plate, welding the polar ears of the anode and the cathode, preparing a battery cell, putting the electric core into a shell and sealing, baking the electric core, injecting liquid into the battery as well as forming the battery and dividing the volume of the battery. The invention relates to a lithium-ion secondary battery which can provide drive energies for electric tools, electric bicycles, motor cars and electric vehicles.

The invention aims to provide a heating system of a power battery of a pure electric automobile and a control method thereof, which are used for eliminating the influence of low temperature on the performance of the power battery of the pure electric automobile to ensure that the pure electric automobile can be used in severe cold areas in winter. The heating system comprises a battery heating device which is arranged in a battery pack, wherein the battery heating device is provided with a hollow radiating fin; and the radiating fin is provided with a water inlet and a water outlet. The heating system is characterized by also comprising an auxiliary heater, wherein the auxiliary heater is connected with a fuel supply device; a heat exchanger is arranged in the auxiliary heater; the water inlet of the heat exchanger is communicated with the water outlet of an expansion water tank by a water pump and a water pipe; the water outlet of the heat exchanger is communicated with the water inlet of the radiating fin by an electric control valve; the water outlet of the radiating fine is communicated with the water inlet of the expansion water tank; the electric control valve, the auxiliary heater and the water pump are connected with a vehicle controller and are controlled by the vehicle controller; and the vehicle controller is also connected with a battery management system.

The invention provides power battery pole ears and a power battery. The power battery pole ears are a hollow conductive cylinder. The power battery comprises a casing, an electric core and an electrolyte which are arranged in the casing, a positive pole ear and a negative pole ear which are electrically connected with the electric core, and an electrolyte circulating pump and an electrolyte constant temperature system which are externally arranged on the casing. The positive pole ear and the negative pole ear are the power battery pole ears, one end parts of the power battery pole ears both extends out of the casing, the end part of negative pole ear, which extends out of the casing, is successively connected via an electrolyte guide pipeline with the electrolyte circulating pump, the electrolyte constant temperature system and the end part of the positive pole ear, which extends out of the casing, and an electrolyte circulation channel is formed. The power battery pole ears enable the electrolyte to flow in and out through the hollow pipeline. The power battery is stable in working temperature and high in safety performance.

The invention discloses a power battery charging and heating system and method of a pure electric vehicle. The charging and heating system comprises a whole vehicle control unit, a vehicle-mounted charger, a charging pile, a battery managing system, a power battery, a DC/DC converter, a heat managing system, a PTC heater and a 12V storage battery for electrifying the charging and heating system at low pressure. The charging and heating method includes the steps that when charging is performed, if the temperature T of the power battery is smaller than or equal to the criticality of the lowest temperature which is preset, the vehicle-mounted charger provides electric energy for the PTC heater, and low-temperature heating is performed. If the temperature T of the power battery is larger than the criticality of the lowest temperature T which is preset, the power battery quits from low-temperature heating and is in a normal charging mode. The power battery charging and heating system and method of the pure electric vehicle can shorten the low-temperature heating time, ensure normal charging of the power battery and meanwhile does not affect the service life of the power battery.

The invention provides a method for recovering valuable metal from waste nickel cobalt lithium manganate batteries and positive pole materials made of the valuable metal and belongs to the technical field of waste power battery recovery. The method can solve the problems in the existing recovery method that proportions of nickel, cobalt and manganese in the waste nickel cobalt lithium manganate batteries are different and corresponding metal is required to be added in recovery steps so as to adjust content of nickel, cobalt and manganese to reach required proportions. In the recovering method, by screening the positive pole materials of all nickel cobalt lithium manganate batteries from the waste nickel cobalt lithium manganate batteries and using the positive pole materials as recovery raw materials of the waste nickel cobalt lithium manganate batteries with the same positive pole materials, nickel cobalt manganate composite carbonate capable of being applied to preparation of the positive pole materials of lithium ion batteries directly without adjusting the proportion of nickel, cobalt and manganese is obtain.

The invention discloses a special power battery management system for an electric vehicle and an implementation method thereof. The power battery management system comprises a central control module, a measurement and control module, a battery pack, a motor controller, a direct-current motor, a vehicle-mounted charger, a current and electric quantity detection module, a vehicle-mounted liquid crystal display module, a switching group, a memory module, a clock module and a temperature management module. The system realizes communication of the central control module with the measurement and control module, the vehicle-mounted charger, the motor controller and the vehicle-mounted liquid crystal display module by only using a CAN communication bus. The battery management system has three working modes of charging, discharging and fault, and can realize acquisition, management and control for all parameter information on voltage, temperature, current, electric quantity and the like for the battery of the system, safe charging and fault early warning of the battery. Compared with the prior art, the battery management system has the advantages of higher reliability, charging safety, stable system work, comprehensive function and convenient subsequent expansion.

The invention relates to a power battery-super capacitor hybrid power system for electric automobiles, belonging to the electric automobile technical field. The power battery-super capacitor hybrid power system for the electric automobiles comprises a power battery pack, a motor controller and a 24V storage battery, a boost DC /DC converter, a bi-directional DC/DC converter and a super capacitance group, wherein, the low voltage end of the boost DC /DC converter is connected with the output end of the power battery pack, the high voltage end of the boost DC /DC converter is connected with the motor controller; the super capacitance group and the high voltage end of the bi-directional DC/DC converter are directly hitched with the high voltage end of the boost DC/DC converter, and the low voltage end of the bi-directional DC/DC converter is connected with the 24V storage battery. The power battery of the power battery-super capacitor hybrid power system for the electric automobiles has smooth output current, small peak current, high discharge efficiency and long service life; when the battery pack SOC is lower, the hybrid system still ensures the normal power output capability; and the super capacitance can directly absorb the braking feedback energy and has high energy conversion efficiency.

The invention relates to a range-extending electric vehicle control system and method, belonging to the technical field of vehicle control of electric vehicles. The range-extending electric vehicle control system comprises a vehicle-mounted power battery, a driving motor, a range extender, a transmission box, a vehicle control unit (VCU), a battery management system (BMS) and a motor control unit (MCU), wherein the range extender consists of a small-sized engine, a power-generating/driving integrated generator, an engine control unit and a power generator control unit; the range extender is used for supplying power to the vehicle-mounted power battery or directly driving the motor; the vehicle control unit is used for carrying out vehicle traveling drive control according to the driver demands and states of all subsystems of the vehicle, managing the vehicle energy and transmitting instruments of various working states to sub nodes of the range extender. According to the range-extending electric vehicle control system and method disclosed by the invention, on the promise of battery system safety and service life and with avoidance of frequent start and stop of the range extender as a target, control over power generation through braking energy recovery and control over power generation of the range extender are coordinated; and when the electric vehicle travels for a long trip, the range extender can be controlled to start or stop, and thus the requirement of extending the driving range of the vehicle is met.

The invention discloses a method for preparing iron lithium phosphate by recovering water-system waste lithium-ion power batteries, comprising the following steps: 1) cutting and brushing a water-system waste lithium-ion power battery, processing by deionized water, sieving and drying to recover the mixture of an electrode material and a conductive agent; 2) adding inorganic acid to the dried mixture of the electrode material and the conductive agent to process, filtering to obtain acid solution containing Li+, Fe2+ and PO43-; 3) adding lithium salt or iron salt to the acid solution containing Li+, Fe2+ and PO43-, adding ascorbic acid and stirring, controlling the pH value to equal to 3-7, and filtering to obtain precipitation; and 4) adding the crude product LiFePO4 obtained in step 3) to a water solution of cane sugar for ball milling, drying and calcining to obtain a regenerative LiFePO4 material. The method has low cost, simple operation and no secondary pollution.

The invention discloses a stroke-increasing type electric automobile and a mode switching control method and system thereof. The stroke-increasing type electric automobile comprises a driving motor and a stroke increasing device, wherein the stroke increasing device is composed of a power generator and an engine. The mode switching control method comprises the following steps that an accelerator pedal signal and a brake pedal signal of the electric automobile are obtained; torque requirement analysis is conducted on the accelerator pedal signal and the brake pedal signal, so that the required torque of the driving motor is obtained, and the required power of the electric automobile is obtained according to the required torque of the driving motor; the power battery SOC of the electric automobile is detected, and the current speed of the electric automobile is obtained; and mode switching is conducted on the electric automobile according to the power battery SOC, the current speed of the electric automobile and the required power of the electric automobile. In this way, the oil consumption and NVH performance of the stroke-increasing type electric automobile are considered comprehensively, and the purposes of reducing oil consumption and improving the driving comfort are realized.

A portable docking station for powering multiple AC-powered battery chargers and multiple DC-powered battery chargers simultaneously. The portable docking station includes an enclosure, a plurality of female AC receptacles, an AC power circuit, a plurality of female DC receptacles, and a DC power circuit. The plurality of female AC receptacles and the plurality of female DC receptacles are accessible from the enclosure. The AC power circuit is contained within the enclosure and powers the plurality of female AC receptacles for powering the multiple AC-powered battery chargers. The DC power circuit is contained within the enclosure and powers the plurality of female DC receptacles for powering the multiple DC-powered battery chargers. The AC power circuit and the DC power circuit operate simultaneously for powering the multiple AC-powered battery chargers and the multiple DC-powered battery chargers, respectively, simultaneously.

The invention discloses a power battery device with a phase-change material cooling system, which comprises a bolt, a plurality of battery monomers, a box cover venting hole, an electrode connecting shaft, a box body top cover, a side venting hole and a frame body, wherein the battery monomers use batteries as base bodies, a shell is arranged outside the battery monomers, phase-change material is filled between the batteries and the shell and is sealed by insulating rubber; a battery box body is provided with the venting holes for radiating; the power battery device can realize that the temperature of batteries of a power device can be effectively reduced under more rugged thermal environment and can meet the requirement of the balance of temperature distribution among the battery monomers, thereby achieving the best operation condition of the power device, and prolonging the battery service life and improving the power performance of the power device. The adopted phase-change material has larger latent heat of phase-change, perfect phase-change temperature, economic and safe material, and high recycle utilization efficiency.

The invention belongs to electrochemical technical field, in particular to a novel high performance water system lithium ion battery. The invention adopts an ion embedding in-out mechanism used by an organic system lithium ion battery in an energy storage element which uses a water solution as an electrolyte. The embedding-in reaction ion mainly includes lithium ion composite and sodium ion composite. In the invention, the positive pole adopts a material containing the positive ion embedding-in composite while the negative pole adopts a shell structure material of LiTi2(PO4)3; the electrolyte adopts a water system electrolyte of the positive ion. The electric charging and discharging process only relates to the ion transfer between the two electrodes, and the invention can still has the characteristic of a rocking-chair type organic system lithium ion battery; the invention is of long cycling service life, big power, safety, low cost and no pollution, and is particularly suitable to be used as an ideal power battery of electric vehicle.

The invention relates to a vehicle control method based on multi-information integration. The method comprises the following steps that: a vehicle controller unit reads vehicle state parameters in real time and correspondingly sends the vehicle state parameters to modules of the vehicle controller unit; a road slope angle calculation module, a vehicle quality calculation module, a vehicle auxiliary power calculation module and a future path forecasting module of the vehicle controller unit calculate the parameters and correspondingly sends the calculated parameters to the modules; a power battery state of charge (SOC) forecasting module determines the optimal target SOC trace curve of a power battery in certain time; a motor target torque calculation module calculates a motor target torque; a power distribution module distributes output power of an auxiliary power unit (APU) system and the power battery according to vehicle accessory power and the motor target torque; the motor target torque calculation module sends the motor target torque to a motor controller unit for controlling the motor to be driven; the power distribution module sends APU target power to an APU controller unit so as to control an auxiliary power source to work; the vehicle controller unit sets a sampling interval and reads the vehicle parameters; and the steps are performed repeatedly until the vehicle is power off. The vehicle control method is applied to pure electric vehicles and hybrid electric vehicles.

The invention discloses a charging-discharging system for a V2G bilateral power conversion electric automobile and a control method thereof, which belong to the technical field of intelligent power grids. In the charging-discharging system, a single-phase or three-phase voltage PWM (Pulse Width Modulation) converter (VSC) is taken as a first-grade power conversion circuit, so that energy conversion between an alternating-current power grid and a first direct-current bus is realized; and a symmetric half-bridge LLC (Logical Link Control) resonant bilateral direct current-direct current (DC/DC) converter is taken as a second-grade power conversion circuit, so that energy conversion between a direct-current bus and a power battery pack is realized. The charging-discharging system has the beneficial effects that: the current of the converter power grid side of the first-grade power conversion circuit is approximate to sine wave, so that the harmonic content is small; and the converting efficiency, dynamic performance and power density of the second-grade power conversion circuit are increased, the volume and weight of a charging-discharging device of the electric automobile are reduced, and the safety, reliability and economic efficiency of the system are improved effectively.

The invention discloses a hard carbon material for a power and energy-storage battery and a preparation method thereof, and aims to solve the technical problem of improving high-rate charge-discharge performance of lithium-ion batteries. The material is provided with a hard carbon matrix, and a coating is coated outside the hard carbon matrix; and the surface of the hard carbon matrix has a honeycomb opening structure. The preparation method comprises the following steps of: dipping, washing, dewatering and drying, presintering at low temperature, crushing, pyrolyzing, crushing and coating. Compared with the prior art, the hard carbon material has the reversible specific capacity of more than 450mAh/g, the first cycle columbic efficiency of over 81 percent, 0.2C 300-cycles capacity-retaining rate of over 97 percent at the temperature of 60 DEG C, and the 0.2C 300-cycles capacity-retaining rate of over 88 percent at the temperature of -30 DEG C, has the advantages of excellent lithium intercalation and deintercalation capability and cycling stability, and simple preparation process, and is applicable to the lithium ion battery cathode materials for lithium ion power batteries, various portable devices and electric tools.

The invention provides a pure electric passenger vehicle communication system based on three ways of CAN buses, comprising a plurality of controllers and three ways of CAN buses, wherein, the CAN buses comprise three ways of CAN buses which are coupled with the plurality of controllers and consist of a CAN1 bus, a CAN2 bus, and a CAN3 bus; the CAN1 bus is a high-speed CAN bus and used for the control of a power system; the CAN2 bus is a high-speed CAN bus and used for the transmission of power battery monometer data; and the CAN3 bus is a low-speed CAN bus, provided with a plurality of vehicle body control nodes, and used for achieving the information collection and control of each part of the vehicle body. The system causes the loading rate of the power system control bus to be greatly reduced, ensures the real-time performance of the control, and improves the driving safety of the electric vehicle.

The invention discloses a method for estimating the charge state of a power cell, which comprises the following steps that: 1. a continuous state space model capable of expressing the relationship of each element in an expression circuit is obtained by an equivalent circuit model of a power cell; the relationship between the open-circuit voltage and the cell charge state is obtained through the standing experiment of the power cell, and the cell charge state is introduced into the continuous state space model of the power cell as a state variable; the power battery model under the noise environment is obtained by combining the noise information; and finally the continuous state space model is subjected to linearization and discretization so as to obtain a linear discrete state space model; 2. a relationship curve of the open-circuit voltage and the cell charge state is obtained through the standing experiment of the power cell, and a parameter k and a parameter d in the power cell model are obtained approximately; 3. parameters of the power cell model are obtained through the identification of current and voltage data collected by a data collecting system; and 4. the power cell charge state is estimated by utilizing a moving horizon estimation method based on the determined power cell model.

The invention relates to a novel waste power battery full-automatic dismantling device including: 1, a loading mechanism, 2, a loading conveyer, 3, a four-station material poking mechanism, 4, material distribution conveyers, 5, cutting devices, 6, separation feeding mechanisms, 7, separators, 8, outer shell storage boxes, and 9, electric core storage boxes. Along the power battery heading direction, the loading mechanism, the loading conveyer, the four-station material poking mechanism, the material distribution conveyers, the cutting devices, the separation feeding mechanisms and the separators are successively arranged; the outer shell storage boxes and the electric core storage boxes are respectively connected with the separators. The invention also relates to a novel waste power battery full-automatic dismantling method. The device has the advantages of simple structure and high dismantling efficiency, adopts a battery mechanical dismantling way integrating electrode head end one-time cutting and electric core clipping-out, and belongs to the power battery recycling processing field.

The present invention discloses a high-voltage double-loop safety system of electric vehicle and a method thereof. The high-voltage double-loop safety system of electric vehicle comprises a hardwired control loop which is composed of a VMS vehicle controller, a motor controller assembly, a driving motor and a high-voltage power battery pack assembly through hardwired connection in series, a VMS vehicle controller which is connected in parallel in the vehicle CAN network, and a communication network control loop composed of an MCU control plate in the motor controller assembly and a BMS battery management system in the high-voltage power battery pack assembly. The control method of the invention mainly determines whether the power battery outputs high-voltage electricity through the self testing of each control system and the safety information interaction checking of CAN communication network. The high-voltage double-loop safety system of electric vehicle according to the invention can reliably realize the purpose of protection of electric vehicle or the high-voltage electric device and high-voltage power transmission line in a hybrid power vehicle and the operator safety. The safety and reliability of high-voltage electricity can be greatly increased.

The invention discloses a lithium ion power battery non-water electrolyte. The lithium ion power battery non-water electrolyte is prepared from, by weight, 100 parts of solvents, common lithium salts, 0.2-10 parts of anode film formation additives, 0.2-10 parts of circulation improvement additives and 0.01-0.5 part of acid and water removal additives. The solvents are cyclic carbonic ester and/or chain carbonic ester, and the molar concentration of the common salts in the solvents is 0.8-1.5 mol/L. Due to the combination use of the anode film formation additives, the circulation improvement additives and the acid and water removal additives, during first formation, a CEI film can be formed on the surface of an anode, the stability of a cathode SEI film can be improved, and the normal temperature circulation performance, the high-temperature 45 DEG C circulation performance and the high-temperature storage performance of a power battery can be remarkably improved.

The invention relates to a screening grouping method of echelon utilization type lithium batteries, and belongs to the technical field of determination of parameters of the lithium batteries. According to the technical scheme, the screening grouping method of the echelon utilization type lithium batteries comprises the following steps: testing and calculating so as to obtain a battery dQ/dV-V curve, analyzing ageing reasons of return power batteries by adopting an ICA (Incremental Capacity Analysis) method, and firstly rejecting the return power batteries, negative active materials of which are lost; testing to obtain the capacities, ohmic internal resistance, polarization internal resistancs and self-discharge values of the echelon utilization type lithium batteries, and screening the batteries according to indexes; and regrouping the screened batteries. The screening grouping method of the echelon utilization type lithium batteries has the beneficial effects that serious declining batteries are rejected by screening the echelon utilization type lithium batteries so as to ensure that the echelon utilization grouping property of the batteries is not affected by individual damaged battery; the batteries which are similar in terms of capacity, ohmic internal resistance and polarization internal resistance are clustered together by using a weighting k-means clustering method, and due to the setting of weights, the capacity utilization rate of a battery group is ensured; the forming consistency of the echelon utilization type lithium batteries can be improved, and the service life of the echelon utilization type lithium batteries is prolonged.

The invention discloses a thermal management device for power batteries and a thermal management method for the power batteries under abnormal working conditions. The thermal management device for the power batteries comprises an acquisition module, an evaluation module, a forecast module, a display module and a control module, wherein the forecast module is used for calculating the heat generation rate and the specific heat capacity according to temperature and temperature rise rate information obtained by the acquisition module and the evaluation module and information such as types, operating states, states of charge and the like of the power batteries so as to obtain forecasted temperature field distribution of a battery unit, and the display module is used for displaying the temperature field distribution of the battery unit forecasted by the forecast module and a current alarm status of the battery unit to a user. The thermal management method for the power batteries is capable of forecasting the temperature field distribution of the battery unit according to acquired temperature and temperature rise data, and at least one of control measures such as turn-off, heat dissipation, alarm and the like is effectively taken, so that the danger of an automobile due to the power batteries can be reduced under the abnormal working conditions.

The invention discloses a method for estimating the health state of a power battery. The method comprises steps of acquiring the constant-current charging voltage V, current I and time t of a batteryto obtain charging capacity Q, establishing a V-Q relationship curve, acquiring a capacity increment curve peak value and peak position information, establishing a RBF neural network, training a RBF neural network model by a particle swarm optimization algorithm, and estimating the health state of the battery by using the generated RBF neural network. The method establishes a mapping relationshipamong the constant-current charging capacity increment curve peak value, the peak position and the health state of the battery by means of a data driving mode without establishing an equivalent circuit of the electric vehicle power battery, thereby improving estimation accuracy and realizing online real-time estimation for the overall estimation of a battery pack.

The invention discloses a waste energy echelon utilization method of a power battery for an electric vehicle. The waste energy echelon utilization method of the power battery for the electric vehicle comprises the following steps: firstly, a waste power battery set is disassembled; secondly, performance detection is conducted on battery monomers without damaged appearance to screen out battery monomers capable of being directly used and ensure that a fifth step is accessed, the battery monomers capable of being repaired and reused are screened out, and processed in a third step, and unrepairable battery monomers are processed in a discarded mode; thirdly, the battery monomers capable of being repaired and reused are repaired; fourthly, performance detection is conducted on repaired battery monomers to screen out battery monomers with the difference of nominal voltage and virtual voltage not larger than 0.02V and the virtual capacity not lower than 70% of nominal capacity, the battery monomers with the difference of the nominal voltage and the virtual voltage not larger than 0.02V and the virtual capacity not lower than 70% of the nominal capacity are processed according to the next step, and the repaired battery monomers not capable of reaching the standards are processed in a discarded mode; and fifthly, a new power battery set is assembled. Because waste capacity of a monomer battery of the power battery is reasonably utilized, and is recombined to a new power battery applied to different occasions, the waste energy echelon utilization method of the power battery for the electric vehicle not only satisfies requirements of using occasions, but also utilizes performance of the power batteries.

The invention relates to a lithium ion battery low-temperature alternating current heating device for an electric bicycle. The lithium ion battery low-temperature alternating current heating device isused for performing alternating current heating on a power battery. The lithium ion battery low-temperature alternating current heating device comprises a control unit, an energy conversion circuit,an energy storage inductor, a capacitor, a pre-charging circuit and a starting switch, wherein the power battery, the energy storage inductor, the energy conversion circuit and the capacitor are sequentially connected to form a loop; the pre-charging circuit and the starting switch are parallelly connected between the power battery and the capacitor; the control unit is respectively connected withthe energy conversion circuit, the pre-charging circuit and the starting switch, and controls the on-off state of the starting switch according to the temperature information of the power battery, sothat the conversion between the alternating current heating state and the normal power supply state of the power battery can be realized; during the entering of the alternating current heating state,the control unit controls the work state of the energy conversion circuit according to the current information of the power battery in real time; the inside heating is realized in the alternating current charging and discharging process of the power battery. Compared with the prior art, the lithium ion battery low-temperature alternating current heating device has the advantages that the heatingis uniform; the efficiency is high; the newly added devices are few; the cost is low, and the like.