224results about How to "Improve balance efficiency" patented technology

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.

The invention discloses a switch matrix and LC resonant transformation based cells to cells equalization circuit and a method. The circuit comprises a microcontroller, a matrix switch module, an equalization bus, an LC resonant transformation module and a filtering capacitor. Zero current switch equalization from any adjacent cells to any adjacent cells or any cell in a pack can be achieved, and the equalization efficiency is greatly improved; the magnitude of the equalization current is adjusted by controlling the difference of the optimal discharging and optimal charging cells, and the inconsistency between the cells is improved; the problem of low equalization efficiency of charging and discharging during equalization of traditional pack to cell equalization circuits is solved, and the problem of the limitation of improvement of the equalization current of the Cell to Cell equalization circuits is solved.

The invention discloses an equalization circuit based on a Buck-Boost convertor and a bidirectional LC (inductance capacitance) resonant convertor as well as an implementation method. The equalization circuit comprises a microcontroller, the Buck-Boost convertor, the bidirectional LC resonant convertor, an option switch module, an equalization busbar, a battery pack and filter capacitors. According to the equalization circuit, by means of control of output voltage of the Buck-Boost convertor as well as the bidirectional LC resonant convertor, soft switching equalization of Pack to Cell or Cell to Pack can be realized, the equalization circuit has the advantages of high efficiency, simplicity in control, small size, switching loss avoidance, easiness in modularization and the like, and the defect that the traditional Pack to Cell equalization circuit cannot deal with the condition that certain cell in a pack has higher voltage while other cells are in equalization is overcome.

The invention discloses a power battery balance control method, apparatus and circuit. The power battery balance control method comprises the steps of detecting a to-be-balanced single power battery satisfying a preset balance start condition, and balancing the to-be-balanced single power battery; judging whether the to-be-balanced single power battery satisfies a balance discontinuation condition or not in the balancing process for the to-be-balanced single power battery; if so, discontinuing the balance on the to-be-balanced single power battery, and continuing to balance the to-be-balanced single power battery when the to-be-balanced single power battery satisfies a balance continuation condition; or otherwise, continuing to balance the to-be-balanced single power battery until the balancing time for the to-be-balanced single power battery satisfies a balancing time calculated value, and stopping the balancing. The technical problem of relatively low balance efficiency of the power battery is solved by the power battery balance control method, apparatus and circuit.

The invention discloses a fast recognition method for the unbalance amount of internal and external rotors of a synchronous double-rotor system and includes that 1) the internal and the external rotors are provided with a reference signal sensor and the external rotor is provided with a vibration detecting sensor; 2) a marked line is added on any random circumferential direction of the internal and the external rotors, the circumferential direction is marked with angles and the lines of 0 degree of the internal and the external rotors are coincident; 3) the connecting mode of a transfer flange in a differential mechanism is changed to lead to rotating synchronously; 4) unbalance amount M is obtained by test weighing for twice on the external rotor; 5) a machine is stopped, after the internal and the external rotors are staggered at an angle of Alpha 0, the machine is led to rotate synchronously again and M' left is obtained by test weighting for twice on the external rotor; 6) M left inner, Alpha, M left outer and Beta of a left regulating surface are obtained; 7) each unbalance amount of a right regulating surface is obtained in a similar way; 8) the obtained unbalance amount is arranged on the opposite surface of the unbalance amount of the left and the right regulating surfaces to finish the balance of the whole machine. The invention effectively solves the difficulty that the internal rotor can not get a reference signal, avoids the defect of needing test weighting, reduces the balance time in large scale and improves the balance efficiency.

The invention relates to an equalizing device of a battery management system, which comprises a bypass unit, wherein the bypass unit comprises a plurality of bypass devices, at least one part of the bypass devices are energy storage and energy conversion devices, preferably, the energy storage and energy conversion devices can be fans, super capacitors or quadratic chemical power sources, the bypass devices are used in an individual, parallel connection or parallel and series connection way, and the bypass unit also comprises a bypass indicating unit, a switch matrix unit, a battery unit, a data information acquisition unit and a central control unit. The invention also provides an equalizing method of the battery management system; through the invention, the equalizing efficiency is greatly improved under an equal condition, thereby not only shortening the equalizing time, but also satisfying the requirement for automatic and full heat dispersion of a power resistor. The invention enables the heat dispersion and the equalization of the system to be automatically realized without individually providing radiating device, can fully reduce the temperature of an equalizing system, and enables the case and bag design of a battery pack to be simpler and easier to operate and the productionization and the practicalization of a battery system to be further improved.

The invention relates to a high-speed high-precision built-in dynamic and static piezoelectric main shaft. The high-speed high-precision built-in dynamic and static piezoelectric main shaft is characterized in that the main shaft comprises a box body, a front bearing and a rear bearing are arranged in the box body through a front bearing end cover and a rear bearing end cover correspondingly, and the front bearing and the rear bearing jointly bear a main shaft body internally provided with an online dynamic balancing head; the box body is provided with an oil inlet and an oil outlet, the oil inlet communicates with the oil outlet through an oil way, the oil way is divided into two parts, and one part enters the front bearing and the rear bearing through the oil inlet to suspend the main shaft body in a gap between the front bearing and the rear bearing to form pure liquid lubrication; and the other part is fed to the front bearing and the front bearing end cover to make the main shaft body achieve axial positioning, and a grinding wheel is arranged on the front bearing end cover through a flange disc. The high-speed high precision built-in dynamic and static piezoelectric main shaft is simple in structure, good in dynamic performance, large in rotation number of the main shaft, high in rotation precision and small in heat deformation and can be widely applied to grinding wheel electric main shafts of precise grinding machines, main shafts of numerical control machining centers and precise lathes and the like.

The invention provides a battery pack active-passive mixed equalization architecture and a method thereof and belongs to the field of electric vehicles. The equilibrium architecture comprises an active equalization module, a passive equalization module and a main control module. The active equalization module comprises a DC / DC converter, and a multiplexer MUX. The passive equalization module comprises a battery control chip, and n switching devices connected in series with n power resistors. The main control module is in the form of an MCU. The MCU judges whether the voltage of each battery cell reaches a charging / discharging cut-off voltage or not and the voltage consistency of all battery cells, and then selects corresponding equalization manners. When the voltage of one battery cell is larger than a preset threshold, one switching device connected with the above battery cell is controlled to conduct the shunting process (namely the passive equalization process). When the voltage of one battery cell is smaller than the preset threshold, one part of the energy of a battery pack is transferred to the above battery cell by means of the DC / DC converter (namely the active equalization process).

The invention discloses an active equalization system for a power battery pack and a control method, and belongs to the technical field of battery management. The active equalization system comprisesa power battery pack, a monitoring and collecting module, a master control module, an equalization control module and an equalization circuit module; one end of monitoring and collecting module is connected with all battery cells in the power battery pack, the other end of the monitoring and collecting module is connected with the master control module, the master control module is connected withthe equalization control module to perform two-way communication, and the driving end of the equalization control module is connected with the power battery pack through the equalization circuit module. According to the active equalization system, based on an equalization circuit of a flyback transformer, energy is transferred between the batteries and not dissipated in a resistance mode, and therefore the equalization efficiency is improved. In addition, a battery simulator is adopted for replacing the real power battery pack, the method for control over the simulator is integrated to verifyequalization experiments of the equalization system under charging, discharging and standing, and the high efficiency of the system is verified.

The invention relates to a power battery balance charging method and a power battery balancing circuit. The circuit comprises a voltage detection, analysis and comparison circuit, a balance switching circuit, an internal constant current source circuit and a power supply management and protection chip, wherein the voltage detection, analysis and comparison circuit is used to detect the voltage of each battery unit in a battery pack in real time and to respectively transmit detection results to the balance switching circuit and the power supply management and protection chip; the balance switching circuit makes a comparison and a judgment to all voltage values to find the battery unit with the voltage which is lower than the preset voltage value and is the lowest among the voltage of all battery units in the battery pack, a compensation battery is connected with the battery unit through the switching circuit to compensate the battery unit with electricity, and the electricity compensation is stopped when the voltage of the battery unit reaches the average voltage or the highest battery voltage; and by parity of reasoning, other battery units are charged. The invention has the advantages that the compensated electricity of the battery can be accurately controlled; the compensation current is large and the efficiency is high; and the compensation conditions can be flexibly adjusted.

The invention provides an efficient and passive balancing control method for a lithium ion battery for an electric vehicle. Battery cells high in voltage are discharged by controlling the balancing temperature and the balancing number of the battery cells, and therefore the aim of keeping the coincidence between the battery cells high in voltage and the battery cells low in battery voltage is achieved. A battery pack comprises the minimum battery cell with the lowest voltage, comprises the battery cells with the voltage higher than the voltage of the minimum battery cell, comprises N battery cells with the difference values between the voltage of the N battery cells and the voltage of the minimum battery cell larger than a threshold value, and comprises M battery cells which currently allow balancing to be simultaneously started. When M is smaller than N, the first M battery cells with the highest voltage are selected from the N battery cells for balancing starting, and when the highest voltage of the battery cell in the M battery cells is lower than the highest voltage, generated when balancing is not started, of the battery cells, balancing judgment is carried out again; on the contrary, balancing of the N battery cells is started, and balancing judgment is carried out again after the balancing is continued for a period of time.

The invention discloses a Pack to Cell equalization circuit based on an LC resonant converter and an implementation method of the Pack to Cell equalization circuit based on the LC resonant converter. The equalization circuit mainly comprises a microcontroller, a selective switch module, a master switch, an equalization bus-bar, the LC resonant converter and filter capacitors. A battery single body with the lowest voltage is strobed into the equalization bus-bar by the microcontroller and is connected with the output of the LC resonant converter, and the positive electrode and the negative electrode of a battery set is connected with the input of the LC resonant converter by controlling opening and closing of the master switch. Meanwhile, the microcontroller sends a pair of PWM signals which are complementary in state to control the LC resonant converter to alternately work in a charging state or in a discharging state so as to achieve equalization of zero current switching. The Pack to Cell equalization circuit based on the LC resonant converter and the implementation method of the Pack to Cell equalization circuit based on the LC resonant converter effectively improve inconsistency among the battery signal bodies, enhance equalization efficiency, increase equalization currents, shorten equalization time, achieve equalization of zero current switching, reduce energy dissipation, reduce the number of switches and reduce the circuit size and cost.

The invention discloses a relay switching-based lithium battery pack non-dissipative equalizing device, belongs to the technical field of battery protection and aims to provide the relay switching-based lithium battery pack non-dissipative equalizing device which has the advantages of high equalizing current, short equalizing time and high equalizing efficiency. The device comprises a battery pack, a current / current conversion unit, a plurality of double-pole relays and a detection control unit which are connected in series or parallel, wherein an input end of the current / current conversion unit is connected with the positive electrode and the negative electrode of the battery pack, while the output end is a path of isolated direct current power; one end of a normally open contact of each double-pole relay is connected in parallel with the positive electrode and the negative electrode of the output end of the current / current conversion unit respectively; the normally open contact at the other end is correspondingly connected with the positive electrode and the negative electrode of each single battery in the battery pack respectively; and the positive electrode and the negative electrode of each single battery in the battery pack are connected to the detection control unit through voltage detection flat cables respectively. High equalization of each single battery in the battery pack can be ensured by the device.

The present invention relates to a washing machine (1) comprising one or more baffles (8) disposed at the inner surface of the side wall (4) wherein liquid is transferred for counterbalancing the unbalanced load when unbalanced load occurs.

Disclosed are an active voltage balancing system and an active voltage balancing method for a serial energy storage element group. The active voltage balancing system is designed on the basis of the active voltage balancing method. The main technical points of the active voltage balancing method are as follows: a switched capacitor is connected in parallel with each battery or super capacitor in a battery bank or super capacitor bank, all the switched capacitors are connected in parallel with a large-capacity energy storage capacitor, consequently, the redundant electric energy in all the batteries or super capacitors can be first transferred to the switched capacitors and then to the energy storage capacitor together, and finally, the energy storage capacitor is utilized to feed the electric energy back into the whole serial battery bank or super capacitor bank, thus realizing reallocation of the electric energy, enabling the voltage of each battery or super capacitor body in the battery bank or super capacitor bank to be balanced and preventing certain monomers from damage or explosion due to over-high voltage.

The invention discloses a laser precision de-weight system. The system comprises a laser light path transmission unit, a work field, a laser circuit control unit, a focusing adjustment device and a photographic device, and the laser light path transmission unit transmits high-energy density laser to the work field; the laser circuit control unit comprises an upper computer, a master control circuit, a laser control circuit, an image acquisition card and a motor driver; the master control circuit sends direction and pulse instructions received from the upper computer into the motor driver, the motor driver sends direction and pulse signals to the focusing adjustment device, the position movement of the laser light path transmission unit is controlled, and the laser focal position is further controlled accurately. According to the laser precision de-weight system and method, the traditional electric drill de-weight balancing mode is replaced with the laser de-weight mode, defects that the traditional balancing mode is poor in location precision and low in de-weight precision are made up, the traditional complex de-weight process is simplified, a rotor does not need to be mounted and clamped multiple times, and the balancing efficiency of the rotor is improved.

The invention discloses an automatic on-line balancing system of a liquid-injection high-speed main shaft, which is mainly composed of a mechanical structure part and an electric control part, wherein the mechanical structure part comprises a water pan structure and a spray nozzle part; the water pan is directly installed on one end of the main shaft; a water channel in the water pan can ensure that liquid can be stably and accurately distributed in an appointed water cavity after the liquid is injected into the water pan via a spray nozzle; the spray nozzle is connected with a workbench, and the position and the angle of the spray nozzle can be adjusted; the electric control part obtains the vibration signal of the main shaft in real time; according to the vibration change situation of the main shaft, a valve assembly is controlled to precisely inject water; and vibration information collected before and after water is injected each time is used as a judgement basis for system control. The automatic on-line balancing system of a liquid-injection high-speed main shaft is characterized in that centrifugal force generated by the liquid offsets with the initial amount of the unbalance of the main shaft after repeated liquid injection, and the main shaft system is balanced.

The invention relates to a lithium battery pack maintenance and performance detection apparatus, which comprises a charge and discharge machine unit used for connecting to a lithium battery pack, an equalization unit used for performing equalization of batteries in the lithium battery pack and a local monitor unit, wherein the local monitor unit is connected to the charge and discharge machine unit through sampling and controlling; and the local monitor unit and the equalization unit are connected to a CAN bus. The lithium battery pack maintenance and performance detection apparatus has strong function, and can realize the functions of battery pack equalization, monomer internal resistance testing and capacity testing.

The invention discloses a multiphase interleaved converter based battery equalization circuit and a control method therefor. The equalization circuit comprises a controller, a plurality of half-bridge circuits, a plurality of electric reactors and a plurality of battery cells. The half-bridge circuits are all connected in parallel to two ends of a battery pack; and a middle point of each half-bridge circuit is connected with a negative electrode of a battery cell through an electric reactor. According to the circuit, MOS transistors of the half-bridge circuits are controlled by judging the magnitude of average voltage of the battery cells on the upper and lower sides of an inductor and average voltage of the battery pack, so that the equalization of any battery cell to any battery cell is realized. The circuit has the advantages of high equalization efficiency, simplicity for control, small volume, easiness for modularization and the like, and solves difficult problems of low equalization current and difficulty in realizing zero voltage difference equalization for a conventional Cell to Cell type equalization circuit.

The present invention discloses a switching circuit, a system and a method form balancing battery cells. The method for balancing multiple battery cells which are grouped into multiple battery modules includes: obtaining cell parameters of the battery cells, respectively; calculating an average cell parameter for each of the battery modules according to the cell parameters; identifying a donator module and a receiver module from the battery modules based upon the average cell parameter; and transferring energy from the donator module to the receiver module to balance the battery cells. A circuit for balancing battery cells in the present invention uses a converter to transfer energy from the donator module to the receiver module, thus the system for balancing battery cells in the utility model can be suitable for a charging process, a discharging process and an idle state of the battery, and can raise balancing efficiency and reduce complexity of the system.

The invention discloses a battery pack equalization system and control method considering the lifetime of batteries. The system comprises a sampling module, an equalization module, a battery lifetimeprediction module and a control module, the battery lifetime prediction module receives battery information acquired by the sampling module and predicts the lifetime of the batteries, and the controlmodule is used for receiving the battery information, acquired by the sampling module, of a battery pack and battery lifetime information obtained by the battery lifetime prediction module, calculating a voltage difference of adjacent single batteries, determining whether the voltage difference reaches a preset value, determining the adjacent single batteries required for equalization and the timerequired for equalization, and controlling the execution of the equalization module when the battery pack enters a charging and discharging state. The voltage difference of the adjacent single batteries is corrected by employing the battery lifetime information provided by the battery lifetime prediction module, the condition that the differences of the lifetime attenuation degrees of different single batteries cause inconsistent open-circuit voltages of the batteries is effectively considered, the energy waste caused by over-equalization can be avoided, the equalization efficiency is improved, the equalization time is reduced, and the lifetime of the batteries is effectively prolonged.

The invention relates to an equalization circuit structure between single batteries and battery packs, and an equalization method of the equalization circuit structure. The equalization circuit structure comprises two or more single batteries, wherein all the single batteries are connected in series, each single battery is connected with a switch in parallel, every m adjacent single batteries form a pack and are forwardly coupled by means of a transformer, and each pack is in flyback connection with the integral battery pack by means of the transformer so as to form a module. The equalization method is characterized in that: energy is transferred between the battery modules and the integral battery pack by utilizing a transformer flyback principle; meanwhile, the m batteries in the same module realize energy transfer under the forward action of the transformer. According to the equalization circuit structure and the equalization method, good equalization effect is ensured, the numbers of switching tubes and coil windings are reduced, the structural cost is decreased, the combination of forward and flyback principles is realized, and the equalization speed is accelerated.

The invention provides a composite balancing control method of a power battery pack, belonging to the technical field of battery management. By collecting the voltage of each cell of the power batterypack and calculating the voltage difference, the SOC of each cell is estimated and the SOC difference is calculated by the ampere-hour integration method. Then the voltage difference and SOC difference are considered in a weighted manner, and the weight coefficients of voltage difference and SOC difference are set in stages according to the operation state of the power battery pack, so as to achieve the optimal judgment of the balance degree of the power battery pack. The method improves the accuracy of judging the battery pack inconsistency, improves the equalization efficiency, and improvesthe equalization effect.

The invention discloses voltage balancing device and method of a battery system, and electric equipment, which relate to the technical field of batteries and are invented for improving the energy utilization ratio and the voltage balancing efficiency of the battery system. The voltage balancing device of the battery system comprises a transformer, a primary switch, at least two secondary switches and a first voltage balance regulating circuit, wherein the transformer comprises a primary winding and at least two secondary windings; the first voltage balance regulating circuit is used for detecting the voltage of each single electric core of the battery system, controlling the closing of the primary switch when the battery system is charged and controlling the closing of the secondary switches connected in parallel with the single electric core with the lowest voltage while opening the primary switch after set time. The invention can be used for balancing the voltage of each single electric core in the battery system.

The invention discloses a control method and system for voltage balance of a battery system. The battery system comprises at least two battery clusters, and the control system comprises a controller.The controller is used for collecting the voltage value of each battery cluster. The controller is also used for judging whether the battery system meets a preset balance condition or not according tothe voltage values. If the battery system meets the preset balance condition, the controller determines a target battery cluster needing voltage balance in the battery system according to the voltagevalues and performs voltage balance control on the target battery cluster. According to the invention, voltage balance among all the battery clusters can be actively completed, and the balance efficiency is improved; no extra energy loss is caused, and the influence on the service life and safety of the battery clusters is avoided; and in addition, additional devices do not need to be added, andthe cost is low.

The invention discloses a self-adaptive fuzzy balancing control method based on the historical balancing speed. The method is suitable for a Pack to Cell balancing circuit; during each time of balancing, energy is supplemented to a battery monomer with the lowest voltage through a battery pack, the time consumed for each time of balancing is determined through the fuzzy control concept and referring to the time consumed for last time of balancing and the improved voltage difference, the time consumed for balancing is greatly shortened, the number of times of balancing switching is greatly lowered, the over-balancing phenomenon is eliminated, inconsistency between the battery monomers is effectively improved, and the balancing efficiency is improved.

The invention discloses an equalization control method of a battery pack. The equalization of the battery pack is controlled through a preprocessing module, an equalization information calculation module based on the state of charge, an equalization information calculation module based on the voltage at a charging terminal and an equalization opening and closing control module. The method has theadvantages that an equalization control strategy takes the voltage and the state of charge of a battery as the equalization variables, because the voltage is used as the equalization variable, the voltage can be directly measured and obtained, the operation is simple, and the response speed is high; the fluctuation of the voltage in a working state is larger, so that the voltage cannot comprehensively measure the consistency of the battery; and meanwhile, the state of charge of the battery is used as the battery equalization variable, so that the dischargeable electric quantity of the batterycan be kept consistent, the energy utilization rate of the battery can be better improved, equalization is allowed to be started at the beginning of charging, and the equalization efficiency is improved.

The invention discloses a battery monitoring and balancing system and a control method thereof. In a balancing circuit, a battery discharging circuit and a flyback converter are combined for selectively charging or discharging and improving balancing efficiency. A single-chip microcomputer MCU is utilized for directly switching on or switching off a switch array, thereby realizing direct samplingof a single battery through an analog-to-digital converter ADC. Furthermore a switch tube in the flyback converter is directly controlled through the single-chip microcomputer MCU, thereby realizing no requirement for a sampling switch, a balancing switch, a control chip in the flyback converter, and a peripheral device, reducing the number of switches, simplifying the circuit, reducing circuit loss and cost. Furthermore simple control logic of the system is realized, and no requirement for a specialized battery balancing chip is obtained. Furthermore balancing and single battery voltage detection are simultaneously performed in the balancing step, thereby realizing loop controlling to the flyback converter and the discharging circuit and improving balancing efficiency.

The invention discloses a rapid balance control method for a power battery pack. SoC of battery cells and battery packs is detected, the imbalance state of each pack is judged according to the SoC of each battery pack, the battery packs needing energy transfer-out, the amount of energy needing to be transferred out, the battery packs needing energy transfer-in and the amount of energy needing to be transferred in are judged, one battery pack needing energy transfer-out is selected according to the SoC of each battery pack, one battery cell needing energy transfer-out is selected from the battery pack, one battery pack needing energy transfer-in is selected, one battery cell needing energy transfer-in is selected from the battery pack, and energy balance is carried out; the imbalance state of the battery cells in the packs is judged according to the SoC of the battery cells in the packs, one pair of battery cells is selected according to the requirements of energy balance, and energy balance is carried out except for the selected battery packs participating in inter-pack balance. The invention further discloses a rapid balance control device for the power battery pack. The device is used for balancing energy of the battery cells.