176results about How to "Avoid overcharging" patented technology

The invention relates to a photovoltaic cell -DC/DC boost conversion charge method which belongs to battery technique field. The method includes: 1) a portable equipment accumulator voltage is detected by a voltage sensor, when lows to full charge capacity, the voltage sensor makes DC/DC boost converter starting DC/DC conversion, and electricity quantity flows from photovoltaic current to lithium battery for charging; 2) when the portable equipment accumulator is in full charge capacity state, accumulator need not charge again, the voltage sensor makes DC/DC boost converter forbidding DC/DC conversion, thereby, the portable equipment accumulator is protected and over charge phenomena is prevented. The method can be realized simply, and has short reaction time, high efficiency, overvoltage protection and anti-counterblast protection.

The invention discloses a whole vehicle energy management method for an internal combustion generating extend range type electric vehicle. The SOC level of a current electric vehicle storage battery is obtained according to voltage and charging and discharging current information of the two ends of the storage battery, a high SOC threshold and a low SOC threshold are set to determine the on-off state of a range extender, and excessive charging and discharging of the storage battery and frequent start and stop of the range extender are avoided. In a range extend mode, drive demanded power of the whole vehicle is obtained according to discharge voltage and current information of a drive motor and a controller of the drive motor, an economic travel line of an internal combustion engine of the range extender and the current SOC value of the storage battery serve as bases, the optimal operation condition of the range extender is reasonably determined, charging and discharging demands of the storage battery are taken into consideration, accordingly whole vehicle dynamic performance and fuel economical efficiency are guaranteed, and meanwhile the energy storage level of the storage battery is optimized.

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.

The invention discloses a lithium ion battery health state estimation method and system based on a support vector machine. The method comprises the steps of determining input variables and output variables of support vector machine regression prediction; dividing the input variables and the output variables into a training set data set and a test set data set; performing regression model buildingon normalized training set data to obtain a regression function; substituting the test set data into a trained regression model, thereby predicting an electric quantity charged when constant current charging of a battery reaches a cut-off voltage; and fitting the electric quantity charged when the constant current charging reaches the cut-off voltage and current test capacity obtained after capacity testing, and substituting an electric quantity obtained by prediction based on test set data into a fitted equation to obtain current predicted capacity, so that a health state of the battery is estimated. The estimation method and system can be used for predicting the electric quantity charged when the constant current charging of the lithium ion battery reaches the cut-off voltage in variousconstant current charging environments, and has wide applicability.

The invention discloses a lithium-sulfur secondary battery system. The system comprises a positive electrode, a negative electrode and electrolyte, wherein an active substance of the positive electrode is a carbon-sulfur composite material, the negative electrode adopts a metal lithium plate, the electrolyte is high-salinity non-aqueous electrolyte, and the high-salinity non-aqueous electrolyte comprises lithium salt, sodium salt or lithium-sodium mixed salt and non-aqueous organic solvent; and the mol ratio of the lithium salt or the lithium-sodium mixed salt and the non-aqueous organic solvent is 2 to 10 mol/L. The lithium-sulfur secondary battery system has the following remarkable advantages that since the electrolyte system can effectively prevent multi-sulfur ions of the lithium-sulfur battery from being dissolved in the electrolyte in the charging and discharging processes, the multi-sulfur ions which are dissolved in the electrolyte can be prevented from producing a shuttle effect at the last stage of the charging, the over-charge phenomenon can be prevented, and the coulombic efficiency can be improved to be more than 99 percent. Therefore, the cycling performance of the battery also can be greatly improved.

The invention discloses an energy storage control system used for wind electric power regulation and control. A wind electric field is connected with a high-voltage bus through a first boosting transformer, and an energy storage system is connected with the high-voltage bus through a second boosting transformer. The high-voltage bus is connected with an alternating-current power grid. The energy storage system comprises an energy storage medium, a power converter and the energy storage control system. The energy storage medium is connected with the second boosting transformer through the power converter. The energy storage control system collects wind electric field real-time power, the charged state of the energy storage medium and power grid frequency information and outputs control signals to the power converter. The grid-connected wind electric power characteristics are improved by the energy storage technology, the fluctuation of the wind electric power is inhibited, the frequency change of the power grid is simultaneously responded, and inertia response characteristics of a common set are simulated; in addition, energy storage control system can be flexibly switched to a frequency control mode and participate in primary frequency modulation of the power grid, so that the negative influences of wind power grid connection on the grid frequency are effectively reduced.

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 discloses a charge and discharge control method of a power battery. According to the increase of remaining power, SOC zones for working of the power battery are sequentially defined as follows: an overdischarge zone, a discharge buffer zone, a working zone, an energy recovery zone and an overcharge zone. A charging system works at a set frequency cyclically in the following steps: 1) reading the SOC estimation value for this time, and judging the zone to which the SOC estimation value belongs; 2) looking up the table to obtain adjustment signals of the maximum current limit value and the relay status control signal value; and 3) executing the adjustment signals. The allowed maximum charge and discharge current of the battery can be predicted according to the status and temperature of the battery, the limiting values are distributed to a vehicle controller, the vehicle controller performs controlling to make sure that the charge and discharge current does not exceed the allowed limiting values, so that the battery is avoided being overcharged or overdischarged, the working stability and reliability of the power battery are improved, the service life of the battery can be effectively prolonged.

The invention provides a safe charge-discharge control method of an all-vanadium redox flow battery (VRB) comprising a direct current / direct current (DC / DC) converter. According to the control method, the VRB group cascade bi-directional DC / DC converter is adopted as a charge-discharge port, wherein an inner ring of the DC / DC converter is controlled by a VRB side inductor average current, an outer ring of the DC / DC converter is a double closed-loop strategy which is constant in power, constant in voltage, and controlled by trickle switch, and a corresponding three-stage safe charge-discharge control mode is proposed with the state of charge (SOC) of the VRB and the terminal voltage limiting value as constraint condition. According to the control method, the safe charge-discharge control mode of the battery comprising the converter is considered, flexible safe charge-discharge control mode switch can be achieved by controlling the DC/ DC converter, phenomena of over-charging and over-discharging of the battery are effectively prevented by means of the stage type charge-discharge control method, and damage of the battery caused by over-high charging voltage or over-low discharging voltage is prevented.

The invention discloses a charging control device, a charging control method and a battery management system. The charging control device is used for controlling the process of charging a battery pack by a charging device, and comprises a battery state acquisition unit and a control signal generation unit, wherein the battery state acquisition unit is used for acquiring the state of each single battery in the battery pack, and the state of each single battery in the battery pack at least comprises the voltage of each single battery; and the control signal generation unit is used for switching the charging mode of the charging device according to the voltage of the single battery in the battery pack, and the charging mode comprises at least one of a constant-current charging mode and a constant-voltage charging mode as well as a pulse charging mode. More accurate charging control can be provided according to the device, the method and the system provided by the invention.

The invention relates to a vehicle-mounted battery pack life estimation method and relates to the technical field of automobile industry. The technical scheme is mainly characterized by measuring electric capacity of each battery monomer in a vehicle-mounted battery pack; measuring current, temperature and voltage of each battery monomer in the vehicle-mounted battery pack during operation; according to the current of each battery monomer and corresponding electric capacity of each battery monomer, calculating discharge rate and state of charge of each battery monomer; according to the state of charge of each battery monomer and the corresponding electric capacity of each battery monomer, calculating depth of discharge of each battery monomer; according to the temperature, depth of discharge and discharge rate of each battery monomer, estimating the service life of each battery monomer through a life model; and selecting the shortest life from all battery monomer lives as the service life of the vehicle-mounted battery pack. The vehicle-mounted battery pack life estimation method can effectively protect the vehicle-mounted battery pack, prevent overcharge and overdischarge of eachbattery monomer and ensure safe operation of the vehicle-mounted battery pack.

The invention provides a charging method used in a charging system. The charging system comprises an electromobile and a charging pile for charging the electromobile. The charging method includes following steps: inserting a charging gun into a charging base; detecting state information of the charging pile, and sending the state information of the charging pile to a BMS (battery management system); judging whether the charging pile has fault or not, and if yes, controlling a relay to be off to stop a battery pack from receiving charging current output by a charger; if not, collecting state information of the battery pack before charging; sending request current to a main control board according to the state information of the battery pack before charging; processing the request current, and then sending the processed request current to the charger; outputting charging current corresponding to the request current to charge the battery pack; collecting charging instant state information of the battery pack; sending the charging instant state information to the main control board; judging whether the BMS has fault or not, and if yes, controlling the charger to stop charging the battery pack.

The invention relates to a restoration device of an LCD and a driving method thereof; the restoration device comprises an overdrive operational amplifier which inputs reset control signal and data signal, when the reset control signal is in high level, overdrive signal is output; when the reset control signal is in low level, normal data signal is output; wherein, an overdrive time real time adjustable device which is used for regulating the lasting time of high level of the reset control signal is arranged in front of the operational amplifier. The restoration device of the LCD and the driving method thereof can correspondingly regulate restoration signals according to the position of broken wire on a panel and the lingering measurement of actual restoration wire RC, thus avoiding the poor restoration of over-charging and under charging.

The invention provides a battery protection circuit, and the circuit comprises a battery pack, a BMS main control unit, a first discharge MOS tube, a controllable switch, a positive end, and a negative end. The first discharge MOS tube and the battery pack are connected between the positive end and the negative end in a series manner, and the first discharge MOS tube is used for controlling the on/off of an output current of the battery pack. Two ends of the controllable switch are connected between the positive end and the negative end, and a series circuit which is formed by the battery pack and the first discharge MOS tube is connected with the controllable switch in a parallel manner. The BMS main control unit comprises a control module and a detection module, wherein the detection module is used for detecting the state information of the battery pack and transmitting the state information to the control module, and the control module is connected with the first discharge MOS tube and the controllable switch. The circuit provided by the invention aims at solving problems that a conventional battery protection circuit is large in loop resistance, is large in power consumption and is poor in reversibility of a secondary protection circuit.

The invention relates to a power conversion system based on energy storage of a lithium battery and a control method of the power conversion system, wherein a lithium battery system is connected to a direct-current end of a converter and is formed by the serial and parallel connection of lithium battery single bodies, and the voltage of the lithium battery system formed by serial and parallel connection is not lower than 1.633 times of a voltage level of a grid system. In the invention, an LCL (inductance capacitance inductance) filter formed by tree groups of series inductors and three capacitors is adopted, every two inductors are connected in series into one inductor group, one end of the each three inductor groups is connected to a three-phase alternating-current output terminal of the converter, respectively, and the other end of the each three inductor groups is respectively connected to a power grid; one ends of the three capacitors are connected with one another to form a common terminal, and the other ends of the three capacitors are respectively connected to the common terminal of the three groups of series inductors. The system and the method carry out SOC (state of charge) monitoring on the battery of the lithium battery system, adopts a current feedback type compensation method to compensate a dead zone, and adopts an SVPWM (space vector pulse width modulation) technology to control the converter. The maximal value of the fundamental wave of the voltage of the output wire of the converter is the voltage of the direct-current side, and is higher than an output voltage of common SPWM converters by 15%.

The embodiment of the invention discloses a charging protection method and a terminal. The method comprises: if the terminal enters a charging state, judging whether the terminal meets a pre-set charging protection condition or not; if so, obtaining alarm clock time of the terminal and sleeping time of a user; calculating charging duration of a terminal battery according to the alarm clock time and the sleeping time; obtaining residual electricity of the terminal battery; and setting charging current of the terminal battery according to the residual electricity and the charging duration. By adopting the method provided by the invention, the terminal battery can be fully charged in the charging duration; and with regard to users who are used to charging while sleeping, a condition that the battery is in an overcharging state all the time after the battery is fully charged in a short time can be avoided, so that the service life of the battery is prolonged and the safety of the battery is improved.

The invention discloses a protective shell for an electronic device. The problem that when the electronic device is used outdoors, the electricity storage capacity of a battery of the electronic device is insufficient is solved through photovoltaic power generation, and the storage battery can serve as a charger, and store a certain quantity of electricity for the electronic device; due to the facts that a charging and discharging controller is used for controlling a photovoltaic cell panel to store electric energy processed through photovoltaic conversion in the storage battery, and charging is carried out on the electronic device through the electric energy in the storage battery, the problem that when the photovoltaic cell panel is used for directly charging the electronic device, over charging or countercurrent possibly happens can be solved, charging can also be carried out on the electronic device when sunlight irradiation does not exist, and the limitation of use is avoided; in addition, due to the fact that a switch assembly is used for having control over the state of electric connection between an externally-connected data line port and a port of the electronic device and the state of electric connection between the protective shell for the electronic device and the port of the electronic device, when the switch assembly is turned on, the charging and discharging controller is used for controlling the storage battery or the externally-connected data line port to charge the electronic device, switching between the modes of charging of the electronic device on different occasions can be achieved, and a user can conveniently use the electronic device.

The invention relates to an over-charge and over-heat alarm protecting structure of a soft-shell lithium battery, which comprises an accommodating box and a soft-shell battery cell, wherein a plate is arranged on the soft-shell battery cell, the top end in the accommodating box is provided with a protection and balance circuit board used for protecting and managing the-soft shell battery cell and connected with an external charge power supply, the protection and balance circuit board is connected with the soft-shell battery cell; the external charge power supply is electrically connected with the soft-shell battery cell through the protection and balance circuit board; a push switch is arranged on the side wall in the accommodating box, which corresponds to the plate, the push switch is connected with a switch mechanism on the protection and balance circuit board; and when the external charge power supply is used for over-charging the soft-shell battery cell, the soft-shell battery cell expands towards the direction of the push switch to trigger the push switch through the plate so that the push switch outputs a switching signal to the switch mechanism, and the switch mechanism switches off the connection of the soft-shell battery cell and the external charge power supply. The invention has the advantages of simple structure, convenience for use and installation, high reliability, prolonging of service life and reduction of use cost.

The invention relates to a battery pack balance protecting system and method. The battery pack balance protecting system comprises a lithium battery pack, a control circuit, a main circuit and shunt discharging subcircuits. The main circuit is connected with the control circuit through a charging control switching element and a discharging control switching element. The shunt discharging subcircuits are connected to the control circuit. Single lithium batteries in the lithium battery pack are in series connection. The control circuit comprises over-current detection protecting resistors, lithium battery protecting chips, an MOS (metal oxide semiconductor) used for charging control and an MOS used for discharging control. Pins CO of the single lithium battery protecting chips of the lithium battery pack are connected to the MOS used for charging control, respectively. Pins DO of the lithium battery protecting chips are connected to the MOS used for discharging control, respectively. Pins VM of the lithium battery protecting chips are connected to the main circuit through the over-current detection protecting resistors. Shunt discharging subcircuits of the lithium batteries are in series connection to pins VDD and pins VSS of the corresponding lithium battery protecting chips.

The invention, which belongs to the technical field of the electric car, discloses a state-of-charge calibration method of a hybrid power cell. With the method, a technical problem of large error of the existing SOC calculation method can be solved. The calibration method comprises: a usage upper limit and a usage lower limit of a state of charge of a cell are obtained; a lower limit voltage corresponding to the usage lower limit as well as an upper limit voltage corresponding to the usage upper limit are obtained; when the voltage of the cell is lower than the lower limit voltage, the state of charge of the cell is corrected to be the usage lower limit; and when the voltage of the cell is higher than the upper limit voltage, the state of charge of the cell is corrected to be the usage upper limit.

The invention discloses a roof distributed photovoltaic power generation intelligent energy storage management system, which comprises a photovoltaic power generation module, an energy storage module, a load acquisition module, an energy storage information acquisition module, an environment information acquisition module and a weather prediction module, according to the invention, small-sized photovoltaic power generation systems constructed in a distributed manner in the prior art can be integrated, and power transmission among the small-sized photovoltaic power generation systems integrated in a region is carried out, so that all energy storage units in the energy storage module can keep good power storage; in addition, the electric quantity of the power supply users is preferentially transmitted to the power receiving users, so that the number of the power supply users is reduced, the frequency of transmitting the power to the power grid by the users is reduced, the frequency of power transmission between the small photovoltaic power station and the power grid is reduced, and the utilization rate of the small photovoltaic power station is increased. And the effect of improving the power grid stability is achieved.

The invention relates to a fuel injection system, in particular an overflow valve for a common rail injection system, comprising a valve housing (1) with an inlet (2) and with at least one outlet (3), and comprising a valve element (4) which is accommodated in the valve housing (1) and which is guided in axially displaceable fashion and by means of the axial displacement of which counter to the spring force of a spring (5), the inlet (2) and the outlet (3) can be connected, wherein the spring (5) is accommodated in a spring chamber (6) of the valve housing (1), which spring chamber can be connected via a relief bore (7) to a low-pressure region (8) of the fuel injection system. According to the invention, means (9) for preventing overfilling of the spring chamber (6) are provided, wherein the means (9) comprise an annular groove (10, 10'), which is formed in the guide region of the valve element (4) and which is connected or connectable to the outlet (3), and/or a check valve (11) via which the spring chamber (6) is connectable to the low-pressure region (8). The invention also relates to a fuel injection system having an overflow valve of said type.

The invention provides a voltage dynamic balance management system of a power lithium battery pack, which relates to a charging and discharging balancing circuit of a series power battery pack. The voltage dynamic balance management system comprises a microprocessor, Hall sensor modules, channel selecting modules, a switch driving circuit module and a DC/DC (Direct Current/Direct Current) transformer, wherein the microprocessor is used for gating a single battery in the battery pack by a first channel selecting module; an input end of the DC/DC transformer is connected with two ends of the battery pack; an output end of the DC/DC transformer is connected with two ends of the single battery by the switch driving circuit module and the switch driving circuit module; an input end of a first Hall sensor module is connected with a charging current input end and a discharging current output end of a charging and discharging switch; an output end of the first Hall sensor module is connected with the microprocessor; an input end of a second Hall sensor module is connected with a balancing charging current output end of the switch driving circuit module; an output end of the second Hall sensor module is connected with an input port of the microprocessor; an input end of the switch driving circuit module is connected with an output end of a second channel selecting module; and an output end of the circuit driving circuit module is connected with two ends of the single battery of the battery pack.

The invention discloses a method for determining the largest use current of a lithium-ion battery, belonging to the field of lithium-ion batteries for vehicles. The method comprises the following steps of carrying out charge-discharge on the lithium-ion battery for two to three times by adopting a current of one third of the rated capacity of the lithium battery, and putting the battery aside for one to two hours after the battery is fully charged; detecting the end voltage of the battery and testing equipment; discharging the battery to final discharging voltage by adopting a current with 1 C of nominal capacity, charging for 12 minutes by adopting the current of 1 C, respectively discharging by adopting the current of 0.5C*n, and determining the current with the discharging time being 12 seconds and the discharging voltage being a discharging set voltage as the largest discharging current; performing charge-discharge on the battery for two to three times by adopting the current of 1/3 C, and putting the battery aside for one to two hours after the battery is fully charged; charging the battery by adopting the current of 1 C to the charging upper limit voltage, discharging the battery for 18 minutes by adopting the current of 1 C, respectively charging by adopting the current of 0.5C*m, and determining the current with the charging time being 12 S and the charging voltage being the charging set voltage as the largest charging current. By applying the method, the largest use current is accurately calculated, and the phenomena of overcharging and overdischarging are avoided.

The invention relates to an intelligent balancing management system for batteries and belongs to the technical field of electric vehicles. The balancing management system comprises a voltage collecting system, a matrix switch and a single battery pack and further comprises a standby energy storage battery, a main control unit, an execution module and a direct current (DC)-DC converter. The standby energy storage battery is respectively connected with the matrix switch and the DC-DC converter; the voltage collecting system is respectively connected with the main control unit, the matrix switch and the single battery pack; the main control unit is connected with the matrix switch through the execution module and is connected with the standby energy storage battery through the DC-DC converter; and the matrix switch is connected with the single battery pack. The intelligent balancing management system can effectively solve the problem of over charging and over discharging which are caused by consistency between single batteries, functions of the intelligent balancing management system comprise balance during a charging period and balance during a discharging period, an energy cycle complementary charging and discharging mode is adopted, and the whole system is safe and reliable, effectively improves performance of the battery pack and prolongs service life of the battery pack.

The invention discloses a reference voltage generating circuit applicable to a wide supply voltage range. The circuit includes an initial reference voltage generating circuit, a capacitance bleeder circuit, a first switch, a reset circuit, a reset circuit time delay control circuit, a second switch and a third switch; the initial reference voltage generating circuit is used for generating initialreference voltage; the capacitance bleeder circuit is used for generating capacitance reference voltage; the first switch is used for supplying electricity to the initial reference voltage generatingcircuit and the capacitance bleeder circuit when the circuit is powered on or after the reset operation is carried out; the reset circuit is used for resetting the initial reference voltage generatingcircuit and the capacitance bleeder circuit when it is detected that supply voltage enabling signals are frequently switched; the reset circuit time delay control circuit is used for generating switching detection signals to control the operation of the reset circuit when the supply voltage enabling signals are frequently switched since supply voltage is frequently switched between the low voltage and the high voltage; the second switch is used for outputting the initial reference voltage in a voltage division mode when the reference voltage needs to be refreshed after the initial reference voltage is generated; the third switch is used for enabling the initial reference voltage generating circuit to generate Vref before the reference voltage is refreshed, and switching off the initial reference voltage generating circuit after the refreshing operation is completed.

The invention provides a smart strip and a control method of the smart strip. The smart strip comprises a speech processing module, an executing module,, an information acquisition module and a speechplaying module, wherein the speech processing module is used for acquiring speech signals of a user, recognizing the speech signals and acquiring corresponding control commands; the executing moduleis used for controlling on/off statuses of corresponding jacks in accordance with the control commands; the information acquisition module is used for acquiring working status information of the jacks; and the speech playing module is used for playing the working status information of the jacks. According to the invention, purposes of achieving simple and rapid distance control over the strip andtimely and connecting connecting jack statuses of the strip can be realized.

The invention relates to the technical field of automobile charging and discharging control, in particular to an automobile torque control method and system, and the method comprises the steps: determining the current allowable working power of a battery according to the obtained current state information of the battery; according to the current allowable working power of the battery, determininga first threshold value and a second threshold value of the current allowable working power of the motor; determining the current allowable use power of the motor according to the current use power ofthe motor, the first threshold value and the second threshold value; determining the current allowable use torque of the motor according to the current allowable use power of the motor; and controlling the automobile according to the current allowable torque of the motor. The available charging and discharging power limit values allowed by two stages are set, and the first threshold value is gradually released to the second threshold value when the calculated current use power of the motor reaches the first threshold value, so that overdischarging and overcharging of the battery are avoided while the potential of the maximum charging and discharging power allowed by the battery is mined.