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35results about How to "Reduce charge and discharge current" patented technology
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Secondary battery
InactiveCN1767232AImprove securityReduce manufacturing costCells structural combinationLi-accumulatorsElectricityElectrical resistance and conductance
The invention discloses a secondary battery, which comprises: a casing with positive and negative electrodes; a safety device attached to the surface of the casing, whose resistance value changes with the expansion of the casing; and a protective device installed on one side of the casing. The circuit module is electrically connected to the safety device. The resistance of the safety device changes as the housing expands, and the protection circuit module can reduce or interrupt the charging / discharging current in response thereto. The safety device can be used on all secondary batteries irrespective of the capacity, can react quickly to a sudden rise in internal temperature and rapid expansion, and can reliably prevent expansion that occurs above the allowable temperature.
Owner:SAMSUNG SDI CO LTD
Active equalization system and method of power battery packs of electric bus
ActiveCN104009526AEasy to implement active equalizationIncrease profitBatteries circuit arrangementsElectric powerCapacitancePower battery
The invention provides an active equalization system and method of power battery packs of an electric bus. The system comprises a capacitor battery management and monitoring module, a motor control module, an equalization control module and a capacitor battery circuit module. The capacitor battery circuit module comprises a main circuit switch, a first branch and a plurality of second branches connected in parallel. The first branch and the second branches are connected with the main circuit switch in series after being connected in parallel. The first branch is formed by connecting a super-capacitor pack and a branch switch in series. Each second branch is formed by connecting one power battery pack and a branch switch in series. The invention further provides the equalization method of the active equalization system of the power battery packs of the electric bus. The active equalization system is simple in overall structure and easy to obtain, the utilization rate of the power battery packs is increased, fault cost and maintenance cost caused by overcharge or over-discharge are reduced, and the active equalization system is suitable for being applied and popularized on a large scale.
Owner:ANHUI ANKAI AUTOMOBILE
Method and device for online diagnosis of battery short circuit fault
ActiveCN108318775AShort circuit fault implementationReduce data volumeElectrical testingCharge currentCharged current
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.
Owner:北京市亿微科技有限公司
Delay-locked loop adopting novel error lock detection circuit
InactiveCN105071799AEliminate Harmonic LockHigh locking precisionPulse automatic controlVIT signalsPhase detector
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.
Owner:SOUTHEAST UNIV
Method for realizing parallel connection of two sets of vehicle-mounted battery systems
ActiveCN107146917AReduce charge and discharge currentReduce damage to high voltage componentsElectric devicesCells structural combinationPower flowRing current
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.
Owner:奇可家居有限公司
Static balanced method of battery management system of electric vehicle
InactiveCN103107565AReduce charge and discharge currentImprove uniformityBatteries circuit arrangementsElectric powerAutomotive engineeringDigital circuitry
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.
Owner:赵俊义
Electric car battery current limiting protection method and system
ActiveCN110281811ADynamic current limiting protectionReduce charge and discharge currentSpeed controllerVehicular energy storageCurrent limitingCharge current
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.
Owner:SHANDONG YIXING ELECTRIC AUTO CO LTD
Configuration method for reducing demand for energy storage capacity by island microgrid with power spring
ActiveCN108695871ACharge and discharge power reductionReduce charge and discharge currentPower network operation systems integrationEnergy storagePower qualityMicrogrid
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.
Owner:SHANGHAI JIAO TONG UNIV +2
Group balanced control device and method for energy-storage liquid metal battery
ActiveCN106786909AEnsure consistencyHigh voltageCharge equalisation circuitElectric powerBalanced circuitLiquid metal
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.
Owner:HUAZHONG UNIV OF SCI & TECH
Differential input successive approximation type analog-digital converter
InactiveCN103152048AEliminate the compensation capacitorReduce areaAnalogue/digital conversionElectric signal transmission systemsCapacitanceEngineering
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.
Owner:东南大学无锡分校
Semiconductor memory with read amplifier
InactiveCN1428784AAlleviate voltage stressDecreased charge retentionDigital storageSense amplifierBit plane
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.
Owner:MITSUBISHI ELECTRIC CORP
Display device, gate driving circuit, shift register and control method thereof
InactiveCN109559704AReduce power consumptionSmall inter-electrode capacitanceStatic indicating devicesDigital storageShift registerCapacitance
The invention discloses a display device, a gate driving circuit, a shift register and a control method thereof. The shift register comprises an input module, a first output module, a second output module and a first reset module, wherein the input module is used for setting a pull-up node as valid working potential under the control of a signal input terminal; the first output module is used forwriting the voltage of a clock signal terminal into a cascade signal output terminal under the control of the pull-up node; the second output module is used for writing the voltage of a first power terminal into a gate signal output terminal under the control of the pull-up node; and the first reset module is used for setting the gate signal output terminal and the pull-up node as invalid workingpotential under the control of the first reset signal terminal. The shift register disclosed by the embodiment of the invention separates the cascade signal output terminal and the gate signal outputterminal, thereby connecting a clock signal to a smaller transistor, reducing the inter-electrode capacitance, and thus reducing the power consumption of the gate driving circuit.
Owner:BOE TECH GRP CO LTD +1
Boost clock generation circuit and semiconductor device
InactiveCN1574351AAvoid simultaneous conductionCut through currentStatic indicating devicesSolid-state devicesDevice materialEngineering
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.
Owner:SEIKO EPSON CORP
Booster circuit, semiconductor device, and display device
InactiveCN1574576AReduce manufacturing costStable outputSolid-state devicesSemiconductor/solid-state device manufacturingPower semiconductor deviceDisplay device
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.
Owner:SEIKO EPSON CORP
Semiconductor device and display device
InactiveCN1573897ACost containmentReduce actual installation steps and actual installation areaStatic indicating devicesSolid-state devicesSemiconductorDisplay device
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.
Owner:SEIKO EPSON CORP
A group balance control device and control method for energy storage liquid metal batteries
ActiveCN106786909BEnsure consistencyAlleviate the phenomenon of high currentCharge equalisation circuitElectric powerElectrical batteryBalanced circuit
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.
Owner:HUAZHONG UNIV OF SCI & TECH
A low-power successive approximation analog-to-digital converter and its conversion method
InactiveCN103166644BReduce areaEliminate the compensation capacitorAnalogue/digital conversionElectric signal transmission systemsCapacitanceAnalog-to-digital converter
The invention discloses a low power consumption successive approximation type analog-digital converter and a converting method of the low power consumption successive approximation type analog-digital converter. A switched capacitor network comprises a capacitor pair which is one less in number when compared with output binary coding, timing sequence of switches is arranged anew, common mode electrical level Vcm is introduced during the comparison process, compensation capacitor in traditional successive approximation type analog-digital converter switched capacitor networks, and the effect of achieving N bit resolution ratio of N-1 capacitor is achieved. Compared with traditional successive approximation type analog-digital converters, two capacitor pairs of a highest order and a second highest order are cut down, and accordingly the whole total capacitance is reduced by 75%. Along with reduction of capacitance, charging and discharging target is correspondingly reduced, accordingly overall power consumption is lowered, chip area is reduced, and economic benefit is improved. During conversion process, compared with traditional structures, common mode voltage change quantity of an input end of a comparator is little in common mode shaking only.
Owner:东南大学无锡分校
An energy-feeding variable constant current value positive and negative pulse fast charging device and method
ActiveCN104753146BFast charging methodReduce shockBatteries circuit arrangementsSecondary cells charging/dischargingFull bridgeFast charging
The invention belongs to the technical field of electricity, relates to charging equipment and method, in particular to an energy feed type variable-constant-current and positive-negative-pulse fast charging device and method. The fast charging device is characterized in that alternating currents sequentially pass an air switch, an EMI filter circuit, a full-bridge rectifying and filter circuit and power factor correction circuit, the power factor correction circuit is respectively connected with a controller and a first voltage detecting circuit, the controller is respectively connected with a comparison and conditioning circuit and a first auxiliary power supply, a storage battery charging and discharging management main circuit is respectively connected with the first voltage detecting circuit and a second voltage detecting circuit, a current transformer is respectively connected with an output filter capacitor, the storage battery and a bias circuit, a second optical coupler is respectively connected with the second voltage detecting circuit and a single-chip microcomputer control circuit, the single-chip microcomputer control circuit is respectively connected with a second auxiliary power supply, a display circuit, a drive circuit and the bias circuit, and the display circuit is connected with the second auxiliary power supply. The energy feed type variable-constant-current and positive-negative-pulse fast charging device is simple in structure, convenient to operate, short in charging time and high in electric energy utilization rate.
Owner:青岛艾迪森科技股份有限公司
Semiconductor device and data processing system
InactiveUS20110304382A1Inhibition effectPrevent influence of coupling noiseElectronic switchingDigital storageData processing systemAudio power amplifier
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.
Owner:LONGITUDE LICENSING LTD
A method for power distribution of electric vehicle composite power supply system
ActiveCN111923781BReduce charge and discharge currentImprove powerPropulsion by capacitorsPropulsion by batteries/cellsBattery chargeElectric capacity
Owner:HANGZHOU DIANZI UNIV
Coordinated control method for clutch combination of hybrid power system
ActiveCN105034788BReduce charge and discharge currentPrevent heating up too fast or even overheating phenomenonGas pressure propulsion mountingPlural diverse prime-mover propulsion mountingMotor speedHybrid system
The present invention provides a clutch coupling coordination control method for a hybrid hybrid power system, comprising step 10, before the clutch is coupled, using the engine to control the rotational speed, and the ISG motor to control the torque; and step 20, judging the absolute value of the rotational speed difference between the ISG motor and the drive motor Whether it is less than or equal to n0, if so, switch to using the engine to control the torque, and the ISG motor to control the speed; if not, return to step 10; step 30, judge whether the absolute value of the speed difference between the ISG motor and the driving motor is less than or equal to n1 and the duration is T1 , yes, then give the clutch engagement command; no, return to step 20; step 40, judge whether the absolute value of the speed difference between the ISG motor and the driving motor is less than or equal to n2 and last for T2, if yes, the clutch engagement is completed; no, Then return to step 30. The invention can speed up the speed regulation process before the clutch is combined, reduce the charge and discharge current of the battery during the speed regulation process, and prevent the battery from heating up too fast or even from overheating.
Owner:XIAMEN KING LONG UNITED AUTOMOTIVE IND CO LTD
Booster circuit, semiconductor device, and display device
InactiveCN1328843CReduce charge and discharge currentLow costSolid-state devicesSemiconductor/solid-state device manufacturingPower semiconductor deviceDisplay device
A booster circuit includes: first to M-th power supply lines (VL-1 to VL-M) (M is an integer greater than four); first to (M-2)th boost capacitors (Cu1 to Cu(M-2)), the j-th boost capacitor (1<=j<=M-2, j is an integer) being connected between the j-th power supply line and the (j+1)th power supply line in a first period, and connected between the (j+1)th power supply line and the (j+2)th power supply line in a second period which is subsequent to the first period; and first to (M-3)th stabilization capacitors (Cs1 to Cs(M-3)), the k-th stabilization capacitor (1<=k<=M-3, k is an integer) being connected between the (k+1)th power supply line and the (k+2)th power supply line, and storing an electric charge discharged from the k-th boost capacitor in the second period.
Owner:SEIKO EPSON CORP
Boost clock generation circuit and semiconductor device
InactiveCN100356674CAvoid simultaneous conductionCut through currentStatic indicating devicesSolid-state devicesDevice materialEngineering
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.
Owner:SEIKO EPSON CORP
Method for parallel connection of two vehicle battery systems
InactiveCN107146917BAvoid damageIncrease charge and discharge rateElectric devicesCells structural combinationElectronic loadElectrical battery
Owner:奇可家居有限公司
Power supply control circuit and method for memory
Owner:SEMICON MFG INT (SHANGHAI) CORP +1
Semiconductor device and display device
InactiveCN100386960CReduce charge and discharge currentReduce charge and discharge frequencyStatic indicating devicesSolid-state devicesDisplay deviceEngineering
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.
Owner:SEIKO EPSON CORP
Power distribution method for composite power supply system of electric vehicle
ActiveCN111923781AReduce charge and discharge currentImprove powerPropulsion by capacitorsPropulsion by batteries/cellsElectric capacityFuzzy control system
The invention discloses a power distribution method for a composite power supply system of an electric vehicle. Defects of a single fuzzy controller are overcome. A second-layer fuzzy controller takesa storage battery current target difference value delta Ibat and a storage battery output power initial distribution coefficient alpha 0 as input quantities; the storage battery output power initialdistribution coefficient of a first-layer fuzzy controller can be corrected in real time according to different driving working conditions of the electric vehicle, so that the optimal distribution effect of power between the storage battery and the super capacitor is achieved, and the charging and discharging current of the storage battery is reduced.
Owner:HANGZHOU DIANZI UNIV
A Differential Input Successive Approximation Analog-to-Digital Conversion Method
InactiveCN103152048BEliminate the compensation capacitorReduce areaAnalogue/digital conversionElectric signal transmission systemsCapacitanceEngineering
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.
Owner:东南大学无锡分校
Polyimide composite fiber membrane, preparation method thereof and lithium ion battery
ActiveCN113106757AImprove breathabilityIncrease internal resistanceFibre typesSecondary cellsFiberPhysical chemistry
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.
Owner:SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
Active balancing system and method for power battery pack of electric bus
ActiveCN104009526BEasy to implement active equalizationIncrease profitBatteries circuit arrangementsElectric powerCapacitancePower battery
Owner:ANHUI ANKAI AUTOMOBILE
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