277results about How to "Prevent overdischarge" patented technology

The invention discloses a microgrid real-time energy optimizing and scheduling method in a parallel running mode. The method comprises the following steps of: firstly, dividing 24 hours in a day into a peak period of time, a general period of time and a trough period of time according to the load condition of a large power grid; and then, monitoring the working state of an accumulator in a microgrid in real time in the real-time process of the microgrid and adopting different energy optimizing strategies according to different periods of time and different working states of the accumulator soas to confirm the active power output of various schedulable micro power supplies, the charging and discharging power of the accumulator and scheduling instructions of the active power interactive with the power grid and the passive power of a passive adjustable power supply in the microgrid. The microgrid suitable for the invention comprises a reproducible energy generator, the schedulable micropower supplies and the accumulator. The invention not only can improve the economy and the reliability of the microgrid, but also can help the great power grid to cut peaks and fill troughs and is favorable to prolonging the service life of the accumulator.

In a non-aqueous electrolyte secondary battery provided with a positive electrode 1, a negative electrode 2, and a non-aqueous electrolyte solution, a lithium-containing composite nickel oxide is used as a chief component of the positive electrode material for the positive electrode, a lithium-containing titanium oxide is used as a chief component of the negative electrode material for the negative electrode, and the solvent of the non-aqueous electrolyte solution contains a cyclic carbonic ester and a chain carbonic ester in such a manner that the cyclic carbonic ester and chain carbonic ester are contained in amounts of not less than 10% by volume of the whole solvent, respectively, and the total content of the cyclic carbonic ester and the chain carbonic ester is not less than 60% by volume of the whole solvent.

The invention provides an electric automobile power battery equalization management system and method. Battery cells of a battery pack of the electric automobile power battery equalization management system are connected in series and sequentially divided into M identical battery modules. All the battery modules are connected with corresponding resistor equalization circuits and capacitor equalization circuits as well as a coaxial multi-winding DC-DC converter. A microcontroller is connected with a battery management system so as to acquire battery pack status data. Signals of the microcontroller are connected with all the resistor equalization circuits and the capacitor equalization circuits and further connected with a pulse drive unit and a converter. According to the equalization management method, the microcontroller first acquires nominal parameters of the battery pack, so that control parameters are determined; then, the microcontroller acquires current operation variables, so that the maximum deviation and the dispersion degree of voltage of the battery modules are calculated; according to different states of the battery pack, namely charging, quiescence and discharging, different judgment standards for starting equalization are selected, the converter is used for equalization between the modules, the resistor equalization circuits and the capacitor equalization circuits are used for equalization between the battery cells. According to the electric automobile power battery equalization management system and method, advantages of various equalization circuits are complementary to one another, so that equalization speed is increased, and equalization efficiency is improved.

A battery pack for power tool includes a battery, a monitoring circuit, and a sleep mode switching unit. The battery includes at least one battery cell. The monitoring circuit is operated by receiving power supply from the battery. The sleep mode switching unit switches the battery pack to a sleep mode by stopping at least a part or all of operations of the monitoring circuit when the monitoring circuit detects a discharge end state where a discharge current from the battery is equal to or lower than a predetermined set current value, and the monitoring circuit further detects at least one of a voltage stable state where a voltage change amount in the battery cell is within a predetermined stable range of voltage change amount and a temperature stable state where a temperature change amount in the battery is within a predetermined stable range of temperature change amount.

The invention discloses a battery management system with an active equalization system. The battery management system comprises a single chip microcomputer control circuit, the active equalization system and a data acquisition system, wherein the active equalization system and the data acquisition system are respectively connected with the single chip microcomputer control circuit; the active equalization system comprises a relay gating switch, an additional charge unit, an additional discharge unit and a digital analog switch; the data acquisition system comprises a battery cell voltage acquisition unit; the battery cell voltage acquisition unit comprises an integrated operational amplifier unit and a digital analog switch. According to the battery management system disclosed by the invention, the equalization system is provided with the additional charge unit and the additional discharge unit, and therefore equalization management can be performed on the voltage of each battery cell in a battery pack, and the phenomenon that the battery cells in the battery pack are overcharged or over-discharged can be further avoided; the battery management system disclosed by the invention can be widely applied in the aspects of communication, electric power, traffic and new energy, and has important significance in maintaining the normal operation of the battery pack.

A wireless battery management system includes a plurality of slave BMSs coupled to a plurality of battery modules in one-to-one correspondence. Each slave BMS is configured to operate in active mode and sleep mode. Each slave BMS is configured to wirelessly transmit a detection signal indicating a state of the battery module. The wireless battery management system further includes a master BMS configured to wirelessly receive the detection signal from each of the plurality of slave BMSs. The master BMS is configured to set a scan cycle and a scan duration for each of the plurality of slave BMSs based on the detection signal, and wirelessly transmit a control signal to the plurality of slave BMSs. The control signal includes a wireless balancing command indicating the scan cycle and the scan duration set for each of the plurality of slave BMSs.

Motor output is suppressed without giving an uncomfortable feeling to a driver. When a target drive torque for driving a wheel is set, a high charge time torque which can be outputted in a high state of charge of a battery and a low charge time torque which can be outputted in a low state of charge of the battery are set based on an accelerator operation amount and a vehicle speed. Subsequently, a difference between the high charge time torque and the low charge time torque is multiplied by a charge correction coefficient corresponding to a state of charge, this calculated value is added to the low charge time torque Tl, and the target drive torque is calculated. Accordingly, the target drive torque can be lowered according to the state of charge, and overdischarge of the battery can be prevented. Further, even in the case where the target drive torque is lowered, the target drive torque can be changed according to the accelerator operation, and an excellent feeling can be given to the driver.

The invention provides a battery charging and discharging current control method for an electric vehicle. In the invention, the maximum allowable charging and discharging current is not a unified limit value and varies with temperature and the charge state of a battery, so that control parameters of the battery are refined so as to more finely control the charging and discharging current of the battery and realize optimal estimation and management of the maximum allowable charging and discharging current of the battery. The battery charging and discharging current control method provided by the invention has the beneficial effects that the dynamic property of the battery can be fully utilized when the battery is in good condition, over-charge and over-discharge of the battery can be avoided when the battery is in bad condition, and the conflict between the use dynamic property and long service life of the battery can be solved.

The invention relates to a usage management system and management method of an electric automobile battery, in particular to a method for increasing use efficiency of the electric automobile battery and prolonging the service life of the electric automobile battery. The system comprises a server, a battery pack, an RFID (Radio Frequency Identification Device) label and a client, wherein the RFID label is mounted on the battery pack; the server is mounted at a management center; a server service system is mounted in the server; the client is mounted on each electrical changing station; the client is provided with a battery pack charging monitoring module, an electrical changing scheduling request module and an electrical changing execution driving module; and the server service system comprises a client monitoring module, a data management module and a scheduling executing module; and the system management method comprises the following steps of: 1) setting the RFID label, managing all battery packs in groups, and managing the battery packs in the groups according to grades; 2) when a battery of an automobile is changed, transmitting an electrical changing request by the client, calculating a final battery pack ID by a service scheduling module and returning the battery pack ID to the corresponding client; and 3) executing replacement by the client and updating battery pack information in the RFID label.

The invention discloses a system for realizing balanced discharging of battery sets. The system comprises a plurality of balanced discharging modules, wherein the plurality of balanced discharging modules are connected in series in sequence to form positive and negative terminals of the system; the input end of each balanced discharging module corresponds to a battery; and the control end of each balanced discharging module is connected with a single chip system for keeping residual electric capacities of the batteries in the battery sets to be consistent by logic control. According to the system, the battery sets are connected in series by the balanced discharging modules; as the balanced discharging modules are connected in series, the discharging currents are the same, so that the discharging power of a monomer battery can be controlled by controlling the discharging voltages of the balanced discharging modules, therefore, the balanced discharging of the battery sets is realized and the over-discharging phenomenon caused by different SOC (state of charge) values is avoided. According to the system, a switch control principle is adopted, so that the energy consumption of the traditional passive balancing is avoided and the energy loss caused by energy transfer in active balancing is also avoided. The system can be widely applied to the field of battery management.

The invention discloses a high-capacity charging-discharging battery management system. The high-capacity charging-discharging battery management system comprises a single battery voltage detection and equalization control circuit, a microprocessor, a short circuit protector, an SOC evaluation unit, a current detection unit, a charging control circuit, a discharging control circuit and a temperature detection circuit, wherein the battery management system is characterized in that the single battery voltage detection and equalization control circuit collects the voltage of each single battery in real time, and outputs the collected voltage signal to the microprocessor; meanwhile, the single battery voltage detection and equalization control circuit receives the signal output by the microprocessor and outputs a control signal to an equalization circuit; the equalization circuit receives the control signal output by the single battery voltage detection and equalization control circuit; and the equalization circuit performs bypassing on the charging current of the single battery with high voltage. According to the high-capacity charging-discharging battery management system, the parameter of the single battery is collected in real time and the current electric quantity of the battery is evaluated for performing charging-discharging protection on the battery and for equalizing the electric quantity of each battery; and therefore, the high-capacity charging-discharging battery management system has the characteristics of low cost, low power consumption, high reliability and the like, and is bright in the application prospects.

The invention provides a drive control device for a hybrid vehicle capable of reducing the discomfort of an occupant by releasing a shock in applying the driving force of an internal combustion engine. In the drive control device for a hybrid vehicle including an electric motor (2) and an internal combustion engine (3), when a load is less than a predetermined reference value, the drive wheels are driven only by driving force of the electric motor (2); when the load is the reference value or more, the drive wheels are driven by driving force of both the electric motor (2) and the internal combustion engine (3). A drive force detecting sensor (16) for detecting the drive force is arranged in midway of a drive force transmission system from the internal combustion engine (3) to the drive wheel (4). During the drive wheels are driven by driving force of both the electric motor (2) and the internal combustion engine (3), the controller preferably controls the electric motor to reduce the drive force provided by the electric motor when the drive force detected by the drive force detecting sensor (16) changes to a rising direction based on a rate of change over a predetermined reference value.

The device consists of the connecting electrically parts of a super capacitor module (SCM), the voltage balance controller, several inductance voltage eveners (IVE) and the fly-over capacitor voltage evener (FCVE). SCM consists of several serial energy storage units (ES). Each ES consists of several serial super capacitors (SC). IVE is used to even the voltage between the adjacent ESs. FCVE is used to even the voltage in each ES. Under the function of FCVE and IVE, all SC in SCU reaches an even voltage. The invention possesses a high working efficiency. It can effectively improve the uneven voltages between SCs. The voltage difference between all SC will not exceed a certain defined range. The invention avoids overcharging and over discharging so as to extend the capacitor life. The invention raises the energy use ratio and the reliability of the energy storage system.

The invention relates to a carbon modified material applied in cathode of lithium-ion secondary batteries. The carbon modified material takes one or more of glucose, fructose, cane sugar, cellulose and starch as raw material, which is dissolved in organic solvent and treated by liquid phase dehydration processing in a pressure container, then is subject to surface coating modification, low temperature curing, carbonization and finally is heat treated at high temperature, cooled and sieved; the coating modification technique adopted by the invention overcomes defect of the prior thermolysis hard carbon material, and compared with common carbon material, the invention improves specific volumetric capacity and initial efficiency and reduces specific surface area, thus eliminating loss of reversible capacity due to sensitivity of thermolysis hard carbon material to air and improving processing property of material.

An electric vehicle includes: a storage device configured to store power used for traveling; an auxiliary battery configured to store power supplied to an auxiliary load; a converter configured to charge the auxiliary battery by using power supplied from the storage device; and a shut-off device configured to switch between a supply condition in which power is supplied to the auxiliary load from the auxiliary battery and a shut-off condition in which power is not supplied to the auxiliary load from the auxiliary battery. During control of the electric vehicle, the converter is controlled such that an output voltage of the converter is higher when the shut-off device is in the shut-off condition than when the shut-off device is in the supply condition.

The invention relates to a state of charge-based hybrid energy storage hierarchical coordination control method, which is used for control of a micro-grid comprising a hybrid energy storage unit. The hybrid energy storage unit comprises a storage battery and a supercapacitor that are connected to a direct-current bus through DC/DC converters respectively; and the direct-current bus is connected to an alternating-current bus of the micro-grid through a DC/AC converter. The method comprises the following steps of obtaining a voltage of the alternating-current bus of the micro-grid, a frequency of the alternating-current bus and a comprehensive state of charge of the hybrid energy storage unit, performing upper-layer power optimization control, obtaining a output power instruction of the DC/AC converter, and controlling the DC/AC converter to work; and obtaining a voltage of the direct-current bus, performing lower-layer power allocation by taking the stable voltage of the direct-current bus as a target, obtaining charging-discharging power instructions of the storage battery and the supercapacitor, and controlling the corresponding DC/DC converter to work. Compared with the prior art, the method has the advantage that overcharging or overdischarging of a hybrid energy storage battery can be effectively prevented.

The invention relates to a storage battery discharge comprehensive tester which is a device used for storage battery constant-current discharge, battery detection and battery capacity judgement. The storage battery discharge comprehensive tester comprises a discharge unit which realizes the constant current discharge, a monitoring unit which provides the discharge unit with comparison current and monitors the capacity of the storage battery and a data processing unit which processes data and draws a drawing for analyzing. The storage battery discharge comprehensive tester realizes the constant current discharge of the current and can simultaneously measure the capacity of the storage battery at real time to prevent the overdischarge of the storage battery by the mutual action of the discharge unit, the monitoring unit and the data processing unit.

The invention belongs to the technical field of electric vehicles, and relates to an energy control method of an extended range electric vehicle. The problems of short service life of power batteries, low working efficiency of engines and the unitary vehicle operation mode in the prior art are solved. The energy control method of the extended range electric vehicle comprises the following steps of (1) acquiring the health status of a power battery, (2) judging whether the health status of the power battery is smaller than the health status index value of the power battery or not, (3) judging whether a brake pedal acts, (4) judging whether the electric quantity of the power battery is higher than the electric quantity lower limit value of the power battery which is in the health status or not, (5) entering into a multipoint electric quantity recovery stage in a whole vehicle mode, (6) entering into a single-point electric quantity consumption stage in a whole vehicle mode, (7) judging whether the brake pedal acts, (8) judging whether the electric quantity of the power battery is higher than the electric quantity lower limit value of the power battery which is in a non-health status, (9) entering into a curve electric quantity maintaining stage in a whole vehicle mode, and (10) entering into a curve electric quantity consumption stage in a whole vehicle mode and controlling the operation mode of the whole vehicle by the power demanded by the whole vehicle.

The invention provides an idling stop controller, which can appropriately prevent accumulator from achieving the overdischarging status in the idling stop control by correctly detecting the charging state of the accumulator. The idling stop controller has an idling stop controlling mechanism and a charging state detection mechanism. When the prescribed condition is satisfied, the idling stop controlling mechanism executes the idling stop control to stop the engine, and in the control, the engine is stated when the starting up operations are detected; the charging state detection mechanism detects the charging state of the accumulator. In the idling stop control, the idling stop controlling mechanism determines whether the charging state of the accumulator is suitable for the status controlled by the idling stop, based on the load voltage detected by the connection of the accumulator and the ACG startup motor. The connection of the accumulator and the ACG startup motor is performed in short time of irrotational degree of the motor. When it is not suitable to the controlled status, the standby indicating lamp emits alarm or restarts the engine.

Provided is a power management system, wherein charging/discharging is conducted while preventing overcharging/over-discharging with reliability, and charging/discharging control of a storage-battery system (22) comprising a plurality of storage battery units is conducted. An overall storage-battery-unit management unit (16) detects voltages of storage-battery packs composing the storage-battery system (22), voltages of unit cells composing the storage-battery packs, and serial voltages of the storage battery units (24), each of which comprises a plurality of storage-battery packs connected in series. Charging is stopped when either of these voltages exceeds an upper limit value, and discharging is stopped when either of these voltages is less than a lower limit value.