34results about How to "Reduce charge and discharge current" patented technology

The invention provides a method and a device for online diagnosis of a battery short circuit fault, and relates to the technical field of batteries. With the adoption of the diagnostic method providedby the embodiment of the invention, a current state of a battery cell can be determined, and the short circuit fault or a normal state of the battery cell can be judged. The diagnostic method requires a small amount of data and low calculation cost, and can quickly diagnose whether the short circuit fault occurs in any battery cell or one of the cells in a battery pack. The charging current and the discharging current used in the diagnosis process are small; charging and discharging are carried out in one direction, thereby realizing the diagnosis of the short circuit fault in the battery cell under a constant current condition.

The invention discloses a delay-locked loop adopting a novel error lock detection circuit, comprising the error lock detection circuit, a phase detector, a charge pump, a low pass filter and a voltage control delay line. The error lock detection circuit detects all output phase clocks of the voltage control delay line, inputs a detection signal into the phase detector, and outputs a charge-discharge control signal to the charge pump. Through adoption of the delay-locked loop, the problem of harmonic wave locking of the conventional delay-locked loop in a broadband range is solved, the harmonic wave locking is eliminated, and a multiphase output of fixed time delay is provided.

The invention discloses a method for realizing parallel connection of two sets of vehicle-mounted battery systems. A general positive relay and the like are included; the general positive relay, a battery management system, a first parallel relay, a parallel-connection protection relay and a second parallel relay are connected in parallel; the parallel-connection protection relay is connected with a pre-charging resistor in series; the battery management system is connected with a 24V power supply in series; and a first battery system and a second battery system are connected in parallel for supplying power for at least one electronic load. By adoption of the method, the problem existing in improvement of charging and discharging rate when the conditions of energy density, energy requirement and the like are not changed in the power supply system of the existing power automobile is solved; compared with the conventional design, the charging and discharging current can be effectively lowered; damage to a high-voltage device caused by heating due to a high current is effectively reduced, heating in the connecting place of battery modules is lowered, and the long-standing problem existing in module connecting design is relieved; the problem of ring current impact of parallel instantaneous high current in parallel connection use is solved; and the battery system is more reliable, and the service life of electrical devices can be prolonged.

The invention relates to a lithium-ion battery in a new-energy electric vehicle, in particular to a static balanced method of a battery management system of the electric vehicle. The static balanced method of the battery management system of the electric vehicle carries out balance by using a singlechip, a digital circuit, a light insulation relay, a super-capacitor and other technologies, and relying on a voltage acquisition module in the battery management system when the electric vehicle is in a static state, namely, a current is smaller than 0.05C of a battery capacity. A balancing mode comprises (1) using the super-capacitor to achieve moving of energy, namely, electric energy is moved from a battery in high electromotive force to a battery in low electromotive force; (2) using high-power resistor to carry out discharging of a whole group of batteries; combining two modes in the step (1) and the step (2), and meanwhile combining the characteristics that the time when a majority of electric vehicles are in the static state is long, and finally achieving capacity balance of batteries in the whole electric vehicle. The static balanced method of the battery management system of the electric vehicle solves the problems that the service life of power batteries is shortened because capacities of the power batteries are unbalanced in the process of use, and the like.

The embodiment of the invention discloses an electric car battery current limiting protection method and system. The method comprises the steps that a battery management system collects current status information of a battery in real time, acquires the busbar voltage of the battery and the busbar current of the battery according to the current status information and the optimal charging current limiting value and the optimal discharging current limiting value suitable for the current status of the battery and transmits the busbar voltage of the battery and the busbar current of the battery, the optimal charging current limiting value and the optimal discharging current limiting value to a finished car control unit; a motor control unit collects the current rotational speed and the current busbar current of a motor and transmits the current rotational speed and the current busbar current of the motor to the finished car control unit; the finished car control unit acquires a first required torque satisfying the optimal charging current limiting value and the optimal discharging current limiting value according to the busbar voltage and the busbar current of the battery, the optimal charging current limiting value, the optimal discharging current limiting value and the current rotational speed and the current busbar current of the motor and transmits the first required torque to an MCU; and the torque of the motor is controlled according to the first required torque and is made to operate according to the first required torque.

The invention relates to a configuration method for reducing the demand for energy storage capacity by an island microgrid with a power spring. The island microgrid comprises conventional distributedpower sources, an energy storage system, a diesel generator, an alternating-current bus, electric loads, and a power spring. The conventional distributed power sources include wind power and photovoltaic power sources. The electric loads are classified into key loads and non-key loads based on different demands of the electric energy quality by electrical devices. According to the invention, positive interaction between the power spring and the energy storage system is realized, the charging and discharging current and power of the energy storage system are reduced effectively, and the servicelife of the energy storage system is prolonged; the demand of the energy storage capacity configuration by the system is reduced; and the economy of the island microgrid is improved. Therefore, one part of virtual energy storage capacity is provided for the microgrid by the power spring equivalently.

The invention belongs to the field of electrochemical energy storage and particularly relates to a group balanced control device and method for an energy-storage liquid metal battery. The group balanced control device for the energy-storage liquid metal battery comprises N serially connected liquid metal battery units, a voltage detection module, a balanced control module and a balanced circuit module; multiple liquid metal battery monomers with higher consistency are screened and are firstly connected in series and later connected in parallel to form one battery unit, and the battery units are placed in the same high-temperature incubator. The invention further discloses a group charge and discharge balanced control method of the energy-storage liquid metal battery. By means of the control device and the control method, the defect that initiative balanced control is difficult to implement due to the fact that a voltage platform of the liquid metal battery is low and wide can be overcome, the control method and the control device can meet the requirement for the high-temperature environment during group use of the liquid metal battery, and the complexity of the balanced control device and control method is reduced, so that the energy storage use demands of the liquid metal battery are met.

The invention discloses a differential input successive approximation type analog-digital converter. A switched-capacitor network comprises capacitor pairs of which the quantity is identical with that of output binary code digits; a compensation capacitor in a traditional SAR (Successive Approximation) type ADC (Analog to Digital Converter) switched-capacitor network is omitted by brand-new time sequence arrangement of the switch, so that the capacitance at highest order is reduced by 50 percent and the whole total capacitor is also reduced by 50 percent. Charge/discharge current is correspondingly reduced along with the reduction of the capacitance, and thus the integral power consumption is reduced. Meanwhile, the area of a chip is reduced and economic benefits are increased. In the converting process, common-mode voltage variable quantity at the input end of a comparator is compared with that of a traditional structure, N is a digit of the ADC and Vref is equal to the difference of VH and VL.

A sense amplifier is connected to a pair of folded bit lines via selection gates. At the time of reading data in a memory cell connected to the bit line, the pair of folded bit lines enter a floating state. At this time, the selection gate is turned off to disconnect the bit line from a sense node. After that, a potential is supplied to the bit line from an equalizer. Consequently, a semiconductor memory device of the invention can suppress deterioration in charge holding capability of a memory cell and prevent erroneous operation.

A boost clock generation circuit (500) including: a first switch circuit (502) connected between a first power supply line and a first clock output line to which the first boost clock signal is output; a second switch circuit (504) connected between a second power supply line and the first clock output line; a third switch circuit (506) connected between a third power supply line and a second clock output line to which the second boost clock signal is output; and a fourth switch circuit (508) connected between a fourth power supply line and the second clock output line. One of the first and second switch circuits is exclusively turned ON, and one of the third and fourth switch circuits is exclusively turned ON. The level of current drive capability of the first switch circuit differs from the level of current drive capability of the third switch circuit; and the level of current drive capability of the second switch circuit differs from the level of current drive capability of the fourth switch circuit.

A booster circuit including first to Mth power supply lines (VL-1 to VL-M) (M is an integer larger than 4) and first and second charge-pump circuits. Each of the charge-pump circuit has first to (M-2)th boost capacitors (Cu1 to Cu(M-2)), wherein the jth boost capacitor (1<=j<=M-2, j is an integer) is connected between the jth power supply line and the (j+1)th power supply line in a first period and is connected between the (j+1)th power supply line and the (j+2)th power supply line in a second period subsequent to the first period. Each of the charge-pump circuits generates a boosted voltage by a charge-pump operation in different phases.

A first circuit is connected with the first and second power supply lines and a boost power supply line, and outputs a voltage obtained by multiplying the voltage between the first and second power supply lines M times (M is a positive integer), between the first power supply line and the boost power supply line. A second circuit is connected with the first power supply line, the boost power supply line and an output power supply line, and includes a plurality of switching elements. The second circuit outputs a voltage obtained by multiplying the voltage generated in the first circuit N times (M>N, M and N is a positive integer), between the first power supply line and the output power supply line by a charge-pump operation using a capacitor connected between first and second terminals outside and the switching element connected with the second terminal.

A semiconductor device comprises a first sense amplifier, first to third transmission lines, and first to third switches. The first and second transmission lines are connected to the first sense amplifier. The first and third switches control connections of the first to third transmission lines, and the second switch controls a connection between a fixed potential and third transmission line. When the second transmission line is not accessed, the first and third switches are brought into a non-conductive state and the second switch is brought into a conductive state, and the fixed potential is supplied to the third transmission line, thereby suppressing influence of the coupling noise between the transmission lines.

The invention relates to a polyimide composite fiber membrane, a preparation method thereof and a lithium ion battery, and belongs to the technical field of batteries. The polyimide composite fiber membrane comprises a polyimide fiber base membrane and a low-melting-point polymer embedded in internal pores of the polyimide fiber base membrane, wherein the low-melting-point polymer has a microporous structure. The low-melting-point polymer of the polyimide composite fiber membrane has the microporous structure, so that the polyimide composite fiber membrane has a thermal closing function; and when the temperature of the polyimide composite fiber membrane rises to the melting temperature of the low-melting-point polymer, the low-melting-point polymer can be automatically melted to fill the microporous structure of the fiber membrane, so that the porous membrane is converted into a compact membrane to increase the air permeability value of the polyimide composite fiber membrane, the internal resistance of the polyimide composite fiber membrane is further increased, the charging and discharging current of the battery is reduced, and the safety problem caused by continuous charging and discharging of the battery in a high-temperature environment is avoided.