CN108470915B - Intelligent electric bicycle quick-charging battery pack and charging method thereof - Google Patents

Intelligent electric bicycle quick-charging battery pack and charging method thereof Download PDF

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CN108470915B
CN108470915B CN201810229228.6A CN201810229228A CN108470915B CN 108470915 B CN108470915 B CN 108470915B CN 201810229228 A CN201810229228 A CN 201810229228A CN 108470915 B CN108470915 B CN 108470915B
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battery pack
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CN108470915A (en
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徐睿
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Fuzhou Superlattice Technology Co ltd
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Fuzhou Dingxi Feiyang Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/446—Initial charging measures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/448—End of discharge regulating measures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The intelligent quick-charging battery pack for the electric bicycle comprises a BMS chip, a charger controlled by the BMS chip and a detachable battery pack connected with the charger, wherein a plurality of single batteries are arranged in the battery pack. The invention also provides a charging method of the intelligent electric bicycle quick-charging battery pack, which comprises a pre-charging program, a main charging program, a secondary charging program and a floating charging program. The method is used for reducing the inconsistency of the capacities among the single batteries of the battery pack and balancing the charging state of each single battery in the charging process so as to improve the charging efficiency and the service life of the battery pack. By the quick-charging battery pack and the charging method, quick charging of the graphene-based lithium battery can be realized, and the problem of service life of the battery caused by uneven charging due to differences of capacity, voltage and the like among single batteries is solved. Meanwhile, in the using process, the heat is effectively dissipated, and the service life of the equipment is prolonged. Therefore, the quick-charging battery pack can be applied to light vehicles such as electric bicycles and the like.

Description

Intelligent electric bicycle quick-charging battery pack and charging method thereof
Technical Field
The invention relates to the technical field of batteries and battery charging methods, in particular to an intelligent electric bicycle quick-charging battery pack and a charging method thereof.
Background
With the development of science and technology, lithium battery chargers are more and more widely applied, lithium batteries are widely applied in the fields of mobile phones and digital, and the batch application on the side of power lithium batteries is started in recent years. With the development of shared economy and the increase of the demand of people for rapid short-distance passage in cities, the electric bicycle with light weight and convenient use has wide market prospect. The power source of the electric bicycle is from a battery, and the existing lead storage battery of the electric bicycle has the problems of heavy weight, fast exhaustion and slow charging. Indirectly cause the efficiency of people moving on a trip to be reduced.
The graphene has excellent electronic and ionic conduction performance and a special two-dimensional monoatomic layer structure, a three-dimensional electronic and ionic transmission network structure can be formed among electrode material particles, and a lithium battery prepared by taking the graphene as a base material has the advantages of large capacity, high charging speed and low exhaustion. The lithium battery has the advantages of being recyclable, free of pollution, high in energy and the like. Due to the limitation of manufacturing process and technology, the inevitable difference exists among the single batteries in the power battery pack in the aspects of capacity, voltage, internal resistance and the like, and the difference is gradually increased along with the increase of the cycle number, so that the battery pack is finally scrapped in advance. In order to reduce the inconsistency of the capacities among the single batteries, effective equalization measures are adopted in the charging process, and the method has important significance.
According to the invention with the publication number of CN106785241A, the corresponding battery of the electric vehicle with fast charging still serves as a lead storage battery, and the method cannot be applied to the existing charging of graphene-based lithium batteries.
Disclosure of Invention
The invention aims to provide an intelligent electric bicycle quick-charging battery pack and a charging method thereof, which can realize quick charging of a graphene-based lithium battery and solve the problem of battery service life caused by uneven charging of differences of capacity, voltage and the like among single batteries. Meanwhile, in the using process, the heat is effectively dissipated, and the service life of the equipment is prolonged. Therefore, the quick-charging battery pack can be applied to light vehicles such as electric bicycles and the like.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the intelligent quick-charging battery pack for the electric bicycle comprises a BMS chip, a charger controlled by the BMS chip and a detachable battery pack connected with the charger, wherein a plurality of single batteries are arranged in the battery pack.
Preferably, the BMS chip is further connected to a status display device, and the status display device includes a warning light.
Preferably, the charger includes a cooling device.
Preferably, the single battery is a graphene-based lithium battery.
The invention also provides a charging method of the intelligent electric bicycle quick-charging battery pack, which is used for charging the intelligent electric bicycle quick-charging battery pack as the preferable intelligent electric bicycle quick-charging battery pack, and is used for reducing the inconsistency of the capacities among the single batteries of the battery pack and balancing the charging state of each single battery in the charging process so as to improve the charging efficiency and the service life of the battery pack, and the method specifically comprises the following four steps:
step one, a pre-charging program: firstly, charging by weak positive pulse current with the current value as first current intensity, adding strong current with the current value as second current intensity once every six weak positive pulses, judging and charging, if the BMS chip detects that the activity of a certain single battery can accept the strong current charging, then switching the single battery into a main charging program after twelve strong current judgment and charging, and if the BMS chip detects that a certain single battery does not meet the strong current charging condition, maintaining the pre-charging program until thirty-six strong current judgment is carried out, and then directly entering the main charging program;
step two, a main charging program: the charger alternately charges the single battery by main positive and negative pulses, the prompt lamp displays a charging signal at the moment, and the cooling device starts to cool; after the capacity of the single battery reaches 85%, switching to a secondary charging program; the main positive and negative pulse current value is the second current intensity;
step three, a secondary charging program: after the main charging program is switched into the secondary charging program, the BMS chip controls the charger to alternately charge by secondary positive and negative pulses after one-minute intermission, and the BMS chip is switched into a floating charging program when the capacity of the single battery reaches 95%; the secondary positive and negative pulse current value is the first current intensity;
step four, a floating charging program: after the secondary charging program is switched into the floating charging program, the prompting lamp prompts a floating charging signal after one-minute intermission, the BMS chip controls the charger to charge the single battery by using floating charging positive and negative pulses until the electric quantity of the single battery reaches 100%, the current of the floating charging positive and negative pulses is linearly reduced along with the charging time, and the BMS chip closes the charging program when the current is reduced to be below 0.2A.
Preferably, in the second main charging process, when the battery capacity is close to 85%, the BMS chip performs a continuous negative pulse discharging test after a positive pulse of each of the main positive and negative pulses, and the battery cell may be transferred to the third main charging process after meeting sixteen negative pulse discharging requirements.
Preferably, the second current intensity is 3C-10C.
Preferably, the first current intensity is one third of the second current intensity.
Preferably, the main pulse width in the main positive and negative pulses is 5-10 seconds, and the negative pulse width in the main positive and negative pulses is 300-100 milliseconds.
Preferably, the amplitude of the negative pulse in the main positive and negative pulses is 1.5 times that of the positive pulse.
The invention has the beneficial effects that: the graphene-based lithium battery has the advantages of light weight and quick charging, and is suitable for electric bicycles; meanwhile, the single batteries monitored and separately controlled by the BMS chip cannot influence the performance of the whole battery pack due to the physical difference between the single batteries; the arrangement of the cooling device and the prompting lamp is convenient for monitoring and adjusting the performance of the battery; meanwhile, the charging method adopts pulse type charging, and has the characteristics of the graphene-based lithium battery, high charging speed and good charging quality.
Detailed Description
The present invention is described in detail below:
an intelligent electric bicycle quick-charging battery pack comprises a BMS chip, a charger controlled by the BMS chip and a detachable battery pack connected with the charger, wherein a plurality of single batteries are arranged in the battery pack. The Battery Management System (BMS) is a link between a battery and a user, and the main object is a secondary battery, mainly in order to improve the utilization rate of the battery and prevent overcharge and overdischarge of the battery, which can conveniently realize the following functions: (1) accurate estimation of SOC, (2) dynamic monitoring, (3) equalization between cells. By implementing these functions, the battery pack can be charged by the charging method described below. The battery pack consisting of the plurality of single batteries has the advantages of convenient production, simple combination and adjustment according to different conditions of the battery compartment of the electric vehicle.
In this embodiment, the BMS chip still is connected with status display device, and status display device includes the warning light. The warning light can be convenient for operating personnel observe the charged state and provide audio-visual show.
In this embodiment, the charger includes a cooling device. The cooling device is one or more of a fan, a radiating fin, a heat conducting pipe and the like, the temperature of the battery can be effectively adjusted through controlling the cooling device, and the situations of electric quantity decline and the like caused by high temperature are avoided.
In this embodiment, the single battery is a graphene-based lithium battery. The graphene lithium battery has the advantages of light weight, high energy density, high charging speed and the like, and is suitable for light vehicles such as electric vehicles and the like.
The embodiment further includes a charging method for a quick-charging battery pack of an intelligent electric bicycle, which is used for charging the quick-charging battery pack of the intelligent electric bicycle in the embodiment, and is characterized in that the method is used for reducing inconsistency of capacities among single batteries of the battery pack and balancing charging states of the single batteries in a charging process to improve charging efficiency and service life of the battery pack, and specifically includes the following four steps:
step one, a pre-charging program: the method comprises the steps of firstly charging with weak positive pulse current with the current value as the first current intensity, adding strong current with the current value as the second current intensity once after each weak positive pulse for six times to judge charging, switching to a main charging program for a certain single battery after twelve times of strong current judgment charging if the BMS chip detects that the activity of the single battery can accept the strong current charging, and maintaining the pre-charging program until thirty-six times of strong current judgment is carried out and then directly entering the main charging program if the BMS chip detects that the single battery does not meet the conditions of the strong current charging. The second current intensity is 3C-10C, and the first current intensity is one third of the second current intensity.
After the charger starts to work, in order to protect the battery pack and the charger from being damaged by strong current impact, about one third of weak positive pulse current is firstly used, and after every 6 times of weak current charging, the strong current is added to judge charging. When the computer chip detects that the strong current access charging can be carried out, after 12 times of strong current charging, the BMS chip controls the charger to enter a main charging program, namely 3C-10C strong current charging is adopted. Otherwise the charger is still maintaining the pre-charge program state, this program process is limited to 36 times. After 36 times of pre-charging, the BMS forcibly transfers to a main charging program, and at this stage, the BMS also detects the terminal voltage of the battery pack, and if the terminal voltage of the battery pack is detected to be greater than a certain value; the BMS immediately goes to the main charging process.
Step two, a main charging program: the charger alternately charges the single battery by main positive and negative pulses, the prompting lamp displays a charging signal at the moment, and the cooling device starts to cool; after the capacity of the single battery reaches 85%, switching to a secondary charging program; the main positive and negative pulse current value is a second current intensity; the main pulse width in the main positive and negative pulses is 5-10 seconds, the negative pulse width in the main positive and negative pulses is 300-100 milliseconds, and the amplitude of the negative pulse in the main positive and negative pulses is 1.5 times that of the positive pulse. When the electric quantity is close to 85%, the BMS chip carries out continuous negative pulse discharge tests after the positive pulse in each main positive and negative pulse, and the single battery can be transferred to the step three times of charging procedures after meeting the sixteen times of negative pulse discharge requirements.
After the BMS enters a main charging program, the charger is in a positive and negative pulse alternating working state. The charging indicator light is indicated by the red light to enter a charging state, and the fan is started at the moment. This process will complete the charging amount of over 85% of the battery capacity, with the average width of the positive pulse being 5-10 seconds, the lower the battery terminal voltage, the greater the width. The negative pulse width is 30-100 milliseconds, the negative pulse amplitude is about 1.5 times of the positive pulse, the positive pulse and the negative pulse are alternated, the interval rest time of 100 milliseconds is respectively provided, the battery endpoint voltage is detected after each negative pulse, particularly when the battery is nearly full of charge, continuous negative pulse discharge tests are carried out after each positive pulse charging current, and after the requirement of 16 times of negative pulse discharge is met, the next procedure is carried out, so that the sufficient compaction of the battery voltage is ensured.
Step three, a secondary charging program: after the main charging program is switched into the secondary charging program, the BMS chip controls the charger to alternately charge by secondary positive and negative pulses after one-minute intermission, and the floating charging program is switched into when the capacity of the single battery reaches 95 percent; the secondary positive and negative pulse current value is the first current intensity;
after the main charging program is finished and after a rest of about one minute, the chip enters a third charging program, the charging current is the same as the pre-charging current, the purpose of the charging program is mainly to finish the charging quantity of 95% of the battery capacity, the charging working mode is completely the same as the main charging program, only the current and the negative pulse amplitude are reduced, thus being beneficial to reducing the polarization of the battery, and when the voltage reaches the negative pulse discharging requirement for 10 times, the next program is switched to. After a rest of one minute, the chip enters a fourth charging procedure, the charging current is about one ninth of the main charging current, the purpose of the charging procedure is mainly to complete the charging quantity of more than 98% of the battery capacity, the charging working mode is completely the same as the main charging procedure, but the current and the negative pulse amplitude are reduced, so that the polarization of the battery is favorably reduced, and when the voltage meets the negative pulse discharging requirement for 10 times, the next procedure is switched to. The chip automatically goes to a fifth charging procedure, namely a floating charging procedure.
Step four, a floating charging program: after the secondary charging program is switched into the floating charging program, a prompting lamp prompts a floating charging signal after one-minute intermission, the BMS chip controls the charger to charge the single battery by using the floating positive and negative pulses until the electric quantity of the single battery reaches 100%, the current of the floating positive and negative pulses is linearly reduced along with the charging time, and the BMS chip closes the charging program when the current is reduced to be below 0.2A.
After the charger enters the floating charging procedure, the charging indicator light is changed into an orange light, and the charging amount of the last 5% of the battery capacity is mainly completed. The positive pulse width reaches one time of tens of seconds, negative pulses rarely occur, the battery endpoint voltage is maintained at the floating charge voltage around the highest voltage, the current is gradually reduced along with the time, the BMS monitors the current, when the current is less than 0.2A, the floating charge program is quitted, the battery is switched to a shutdown program, for the battery which can not reach the current below 0.2A, the BMS adopts time limit control, and the battery is forced to be switched to the shutdown program after 1 hour is stipulated.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention fall into the protection scope of the present invention, and the technical contents of the present invention which are claimed are all described in the claims.

Claims (5)

1. A charging method for intelligent electric bicycle quick-charging battery pack comprises a BMS chip, a charger controlled by the BMS chip and a detachable battery pack connected with the charger, a plurality of single batteries are arranged in the battery pack, the BMS chip is also connected with a state display device, the state display device comprises a prompting lamp, the charger comprises a cooling device, the single battery is a graphene-based lithium battery, it is characterized in that the method is used for reducing the inconsistency of the capacities among the single batteries of the battery pack, balancing the charging state of each single battery in the charging process so as to improve the charging efficiency and the service life of the battery pack, the single batteries monitored and separately controlled by the BMS chip do not affect the performance of the whole battery pack due to the physical difference, and the method specifically comprises the following four steps:
step one, a pre-charging program: firstly, charging by weak positive pulse current with the current value as first current intensity, adding strong current with the current value as second current intensity once every six weak positive pulses to judge charging, switching to a main charging program for the single batteries after twelve times of strong current judgment charging if the BMS chip detects that the activity of a certain single battery can accept the strong current charging, and maintaining the pre-charging program until thirty-six times of strong current judgment is carried out and then directly entering the main charging program if the BMS chip detects that a certain single battery does not meet the condition of strong current charging;
step two, a main charging program: the charger alternately charges the single battery by main positive and negative pulses, the prompting lamp displays a charging signal at the moment, and the cooling device is started to cool; after the capacity of the single battery reaches 85%, switching to a secondary charging program; the main positive and negative pulse current value is the second current intensity;
step three, a secondary charging program: after the main charging program is switched into the secondary charging program, the BMS chip controls the charger to alternately charge by secondary positive and negative pulses after one-minute intermission, and the BMS chip is switched into a floating charging program when the capacity of the single battery reaches 95%; the current value of the secondary positive and negative pulses is the first current intensity;
step four, a floating charging program: after the secondary charging program is switched into the floating charging program, the prompting lamp prompts a floating charging signal after one-minute intermission, the BMS chip controls the charger to charge the single battery by using the floating positive and negative pulses until the electric quantity of the single battery reaches 100%, the current of the floating positive and negative pulses is linearly reduced along with the charging time, and the BMS chip closes the charging program when the current is reduced to be below 0.2A.
2. The method as claimed in claim 1, wherein the second current level is 3C-10C.
3. The method as claimed in claim 2, wherein the first current level is one third of the second current level.
4. The method as claimed in claim 3, wherein the main pulse width of the main positive and negative pulses is 5-10 seconds, and the negative pulse width of the main positive and negative pulses is 300-100 milliseconds.
5. The method as claimed in claim 4, wherein the magnitude of negative pulse in said main positive and negative pulses is 1.5 times that of positive pulse.
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