174results about How to "Prevent over discharge" patented technology

The invention discloses a device for managing energy of lithium-ion power batteries of electric vehicles and provides a system for managing energy of lithium-ion power batteries of electric vehicles. The system is installed on the vehicle, can monitor the lithium-ion power batteries in real time and can properly control charge and discharge according to the charge and discharge requirements of the lithium-ion power batteries. In the invention, each integrated lithium-ion power battery is controlled by a special control chip, the trickle precharge, quick constant-current charge, constant-voltage charge and supplementary pulse charge occluded stage methods are adopted in the charge process, and equalization discharge control is adopted in the discharge process, which is beneficial to stability of the output voltage and ensures good running smoothness of the electric vehicles. The special control chips have unique address codes and a microprocessor of the system can read and write the information of the special chips. Equalization of charge and discharge processes of each group of lithium-ion power batteries is achieved according to the acquired battery voltage, charge and discharge current and voltage variation of energy transmission control modules of the temperature information control system.

The invention provides a lithium ion battery. The lithium ion battery comprises a shell, and an electrode group and an electrolyte which are sealed in the shell, and the electrode group comprises a positive electrode, a negative electrode and a diaphragm positioned between the positive electrode and the negative electrode, wherein the positive electrode comprises a positive conductive matrix and a positive material adhered to the positive conductive matrix, and the positive material comprises a lithium iron phosphate positive active material, a lithium-containing additive, iron phosphate, a conductive agent and a positive binder; the lithium-containing additive is selected from one or more of Lix1Niy1Mnz1O2, Lix2M1y2Oz2, a silicate series positive active material and Lix3M2(WOz3), and the primary particle diameter of iron phosphate is not lower than 20mum; and the negative electrode comprises a negative conductive matrix and a negative material adhered to the negative conductive matrix, the negative material comprises a negative active material and a negative binder, and the negative active material comprises graphite and lithium titanate. The over-discharge resistance capability of the lithium ion battery made in the invention is excellent.

The invention discloses a battery management system which comprises a plurality of battery module monitoring units, a master control unit and an equalization module. The maser control unit performs the functions of receiving data information which is transmitted from the battery module monitoring units, communicating with an electric vehicle whole-vehicle control unit and a charger, detecting a total voltage, a total current and an insulativity, estimating the charge state and health state of the battery according to the acquired battery data, and protecting charging and discharging of the battery. The battery management system realizes battery data acquisition, state estimation, equalization management and charging/discharging protection. The voltage, the current and the battery temperature of a lithium battery are measured. Charging or discharging is controlled according to the current state of the lithium battery, thereby preventing overcharging and over-discharging, and ensuring high safety of the lithium battery and the electric vehicle.

The invention provides a method for increasing the low-temperature discharge capacity by adjusting a discharge cut-off voltage of a battery, and belongs to the technical field of batteries. The method comprises the following steps: calibrating the battery and measuring DC internal resistances of the battery at different temperatures in a relatively low charged state; obtaining discharge curves of the battery under the conditions of different temperatures, different rates and different heat dissipation conditions, and obtaining voltage recovery points generated by thermoelectric coupling actions from the discharge curves in a low-temperature discharge process of the battery; and obtaining the current temperature of the battery, and adjusting the discharge cut-off voltage of the battery according to the discharge rate of the battery, the internal resistances of the battery at different temperatures and the voltage recovery points of the discharge curves of the battery. According to the low-temperature discharge method provided by the invention, the battery can be relatively well used at a low temperature; and the battery discharges more energy.

The invention discloses a battery protection circuit, an electric energy supply device and an electronic device. The battery protection circuit is externally connected with a battery and comprises a battery protection chip for providing protection control signals to the battery, and the battery protection chip at least comprises a positive chip power supply input pin. The battery protection circuit further comprises a chip control switch which is arranged between the positive chip power supply input pin and the positive electrode of the battery and configured as the connected or disconnected status in a controlled way; when the chip control switch is in the connected status, the positive chip power supply input pin of the battery protection chip is connected with the positive electrode of the battery, so that the battery protection chip begins to operate; when the chip control switch is in the disconnected status, the positive chip power supply input pin of the battery protection chip is disconnected with the positive electrode of the battery, so that the battery protection chip stops to operate. Through the solution, the battery is excessively discharged because the battery protection chip consumes power, the service life of the battery is prolonged.

The invention provides an automatically balancing and adjusting method for charging and discharging series storage battery and a device thereof. The device is formed by a DC/DC inverter, wherein, an input end of the DC/DC inverter is connected with a positive end and a negative end of the storage battery, while N groups of completely same current output ends are respectively connected with positive electrodes and negative electrodes of corresponding N batteries; as long as a high-frequency pulse generator is started to work, the inverter can directly distribute electric quantity according to voltage of each battery to transfer electric quantity from a high-capacity battery to a low-capacity battery, so that voltage and electric capacity of each battery tends to be the same to realize balance. The automatically balancing and adjusting method can avoid the phenomena of over charge and over discharge of the storage battery during the process of charging and discharging, thereby protecting the storage battery, and prolonging the service life of the storage battery.

The invention discloses a torque vector control system of a hub four-wheel drive purely-electric vehicle. The torque vector control system comprises a vehicle state monitor, a friction coefficient estimator, a differential torque yawing moment decision making module, a torque control distributor module and a torque coordination control module. The differential torque yawing moment decision makingmodule is used for acquiring vehicle differential torque yawing moment by establishing a kinematics parameter relationship according to the driver input steering wheel rotating angle, vehicle motion information, the road surface adhesion coefficient, lateral tire force and longitudinal tire force. The torque control distributor module is used for acquiring ideal torque distributed values of all wheels according to four-wheel hub motor brake and drive torque requirements, the vehicle motion information, the road surface adhesion coefficient, tire parameter information, the battery SOC value anddifferential torque yawing moment. The control stability of the vehicle can be improved, and the steering sensitivity of the vehicle can be improved.

The invention provides a low-voltage battery charging control method and device. The method comprises the following steps: after the electric vehicle is stationary, a low-voltage battery management system detects the voltage of the low-voltage battery in real time; When the low-voltage battery management system detects that the voltage of the low-voltage battery is less than the preset charging start voltage, the vehicle control unit VCU is woken up so that the VCU wakes up the DC power supply to the DC power supply DC-DC device so that DC-DC device starts charging the low-voltage battery; Turn off the VCU wake-up when the low voltage battery management system detects that the voltage of the low voltage battery reaches the preset end-of-charge voltage. The low-voltage battery charging control method reduces the loss of the charging control module and avoids the overdischarge of the power battery.

The invention discloses a safety management system of an automatic emergency starting power supply. The safety management system is used for management on battery packs and a storage battery clip and comprises a control management unit, a first controlled switch, a second controlled switch and a first current sampler, a storage battery clip system is connected with a positive electrode and a negative electrode of each battery pack, the control management unit is connected with control ends of the first controlled switch and the second controlled switch respectively, the first current sampler is connected in series between a negative electrode of a charging end and the negative electrodes of the battery packs, the control management unit is further connected with the storage battery clip system, the storage battery clip system also comprises a storage battery clip state identification unit and a third controlled switch unit, and the third controlled switch unit is used for connecting or disconnecting with positive outputs of the battery packs. Through the mode, the safety management system of the automatic emergency starting power supply can be used for safety management on the battery packs, the service lifetime of a lithium battery is prolonged, the safety application of the automatic emergency starting power supply can be guaranteed, and a potential risk is eliminated.

The invention discloses an input split type hybrid power flow control method and relates to the technical field of vehicle hybrid power. The method comprises, based on the input split type rotating speed and rotating torque coupling relationship, enabling an engine to be in a rotating speed control mode, and a generator and an electromotor to be in a rotating torque control mode; starting from the target power of a battery pack and a driving required power and based on an optimal fuel economy working curve, determining the working points of the engine, the generator and the electromotor, and meanwhile, ensuring the balance between electric quantity and power of batteries. According to the input split type hybrid power flow control method, firstly, the driving required power and the target power of the battery pack are determined, so that under the premise of ensuring vehicle dynamic performance, the regulating manner of the generator and every electromotor can be determined according to the characteristics of a input split type hybrid power system and accordingly the working points of every power unit can be adjusted flexibly, and further the fuel economy can be enhanced; through power flow control, the power and the electric quantity of the batteries can be in a reasonable state, over-charging or over-discharging of the batteries can be avoided, the system performance can be improved and the service life of the batteries can be prolonged.

The invention discloses a lithium-ion battery SOC estimation method. According to analysis on experimental data of the lithium-ion battery rebound voltage at high or low temperature, a lithium-ion battery residual capacity prediction model of a self-adaption nerve fuzzy inference system is built. The rebound voltage and environment temperature are determined as input of the lithium-ion battery residual capacity prediction model while the lithium-ion battery residual capacity is determined as output. In the platform of MATLAB, according to the experimental data, the lithium-ion battery residual capacity prediction model of the self-adaption nerve fuzzy inference system is trained and verified. The obtained model is applied to predication and verification of the residual capacity of different battery packs. According to the method, the model is adaptable to being embedded into the existing battery management systems at present to realize accurately estimating the residual capacity of the battery so as to prevent overcharge and overdischarge of the battery; and thus, service life of the battery is prolonged, cost of users is lowered and the method has great economic benefit and social benefit.

The invention relates to the field of lithium ion batteries, and discloses a separating membrane used for a lithium ion battery. The separating membrane includes a polymer substrate and a lithium titanate layer formed on one side of the polymer substrate. A preparing method of the separating membrane used for the lithium ion battery and the lithium ion battery comprising the separating membrane are also disclosed. Compared with a mixed anode, through adopting the lithium titanate layer of the separating membrane as an anode separating membrane of the lithium ion battery, a problem that heterogeneous compatibility of lithium titanate and graphite is difficult in a mixing process is overcome, anode material mixing processes are simplified and electrode sheet homogeneity is not influenced. The polymer substrate is coated with the lithium titanate, and the side coated with the lithium titanate layer is adhered to a graphite cathode, thus achieving functions of mixed anodes and further improving transient rate charging performance, low-temperature charging performance and room-temperature cyclic performance.

The invention discloses a management method for power source, comprising: according to a battery electric quantity curve, a first voltage threshold less than the nominal voltage and a second voltage threshold more than the nominal voltage are preset; if actual voltage is less than the first voltage threshold, the battery is charged, while the actual voltage is more than the second voltage threshold, the charging is stopped; and if the actual voltage is not more than the nominal voltage and not less than the first voltage threshold, the voltage of the battery is detected in the period of T/n, while the actual voltage is not less than the nominal voltage and not more than the second voltage threshold, the voltage of the battery is detected in the period of T. The technical proposal adopted by the invention can not only accurately detect the voltage, thus avoiding overdischarge, but also change frequent charge-discharge process; furthermore, the invention can improve the safety of the battery and prolong the service life of the battery without additional hardwares.

The invention provides a mobile power source. The mobile power source comprises an energy storage module, a wired power supply module and a wireless power supply module. The mobile power source is characterized by further comprising a control module and a power switch. The wired power supply module comprises a power supply USB interface used for supplying power to equipment to be charged. The wireless power supply module comprises a wireless power supply main control chip and a wireless transmission unit. Compared with the prior art, the mobile power source has the advantages that the wired power supply mode and the wireless power supply mode are combined, the limited use problem due to the single-mode power supply of an existing mobile power source is solved, the utilization rate of the mobile power source is increased, and a suspend mode is set, so that the power consumption of the mobile power source is reduced and waste of electric quantity of the mobile power source is avoided.

The invention relates to a dual-power stable-switching device, which is used for providing stable switching for a main power supply and a spare power supply, which supply power to electric equipment. The dual-power stable-switching device comprises a main/spare power supply switching unit, a relay control unit, a charging management unit, a main power supply switching auxiliary unit and a spare power supply switching auxiliary unit. The invention also relates to a dual-power stable-switching method. When the dual-power stable-switching device and the method are used, the defect of easy power failure of the electric equipment can be overcome, the load voltage fluctuation is small, no large-capacity capacitors are required for auxiliary switching and use in combination with a radiator is avoided.

The invention relates to a method and a device for correcting the state of charge (SOC) of a battery of an electric vehicle. Through a large number of experiments, correction relation curves for states of charge of the battery under different temperature and different charging and discharging rates and voltage values can be obtained, and the correction function relations form a correction library; as for a battery in a state of charge platform stage, with the correction library as a reference, a period of time with steady charging and discharging rates is selected, the current relation curve in the period of time and a correction relation curve in the correction library under the current temperature are evaluated, and the state of charge of a lithium ion battery is corrected according to the correction evaluation result. The SOC estimation accuracy of the SOC of the battery in the platform stage can be effectively improved, the safety of the battery use is improved, the service life of the battery is prolonged, and the problem that when the SOC of the battery is in the platform stage in the prior art, the correction precision for the SOC of the battery is not high can be solved.

The invention provides an electric automobile and an air conditioner control system and control method of the electric automobile. The air conditioner control system comprises an air conditioner management device and a vehicle control unit, the air conditioner management device is connected with a refrigerating device and/or a heating device and used for judging whether the refrigerating device and/or the heating device meet/meets a starting conditioner or not, and when the refrigerating device and/or the heating device meet/meets the starting condition, a request signal for starting the refrigerating device and/or the heating device is sent out; the vehicle control unit is in communication with the air conditioner management device through a CAN bus and is connected with the air conditioner management device through a hard wire, the vehicle control unit judges whether the electric automobile meets the starting condition of the refrigerating device and/or the heating device or not after receiving the request signal, and the vehicle control unit sends out a signal allowing starting to the air conditioner management device when the starting condition is met. According to the air conditioner control system and control method of the electric automobile and the electric automobile, the vehicle control unit can coordinate with the state of the finished automobile to control the air conditioner system, good performance of a power battery can be protected, and driving performance of the electric automobile is not affected.

The invention discloses a current-charging-and-alternating integrated power battery system and a working method and an application thereof. The current-charging-and-alternating integrated power battery system comprises a fixing power battery pack and at least one alternating power battery pack, and power output terminals of the fixing power battery pack and the alternating power battery packs are connected with power input terminal of a driving motor and are further connected to power input terminals of a BMS power supply through a DCDC module at the same time; and the power output terminals of the BMS power supply are correspondingly connected to a fixing power battery management system, an alternating power battery management system and a main controller. The current-charging-and-alternating integrated power battery system can be applied to realize quick recharging of an electric vehicle or expansion of the power battery pack, the running mileage of the electric vehicle is increased, and mileage anxiety is relieved.

The invention provides a lithium ion battery positive material, a lithium ion battery positive electrode containing the positive material, and a battery containing the positive material. The positive material comprises a lithium iron phosphate positive active material and iron phosphate, and the primary particle size of the iron phosphate is not lower than 20mum. The over-discharge resistance capability of the battery made of the positive material comprising large-granule iron phosphate and the lithium iron phosphate positive active material is excellent; and after cells made in the invention discharge to 2.0V, the cells continuously discharge to near 0V, the decrease trend of a positive electrode potential curve tends to stability, the rise of a negative electrode potential curve is not too high (generally not higher than 1.5V), and the above two potential curves become closer or intersect at 0V. Over-discharge is prevented, the safety of the monomer cells is guaranteed, and the low-potential-energy or uncharged safe transport is realized.