CN111755765A - Lithium ion battery variable frequency pulse charging method and system based on real-time detection - Google Patents

Lithium ion battery variable frequency pulse charging method and system based on real-time detection Download PDF

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CN111755765A
CN111755765A CN202010752775.XA CN202010752775A CN111755765A CN 111755765 A CN111755765 A CN 111755765A CN 202010752775 A CN202010752775 A CN 202010752775A CN 111755765 A CN111755765 A CN 111755765A
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charging
frequency
lithium ion
ion battery
pulse
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史永胜
刘聪
张耀忠
施梦琢
洪元涛
欧阳�
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Shaanxi University of Science and Technology
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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
    • H01M10/44—Methods for charging or discharging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00711—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process
    • 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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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a lithium ion battery variable frequency pulse charging method and system based on real-time detection, and relates to a lithium ion battery variable frequency pulse charging technology. The method comprises the steps of measuring the value range of the optimal pulse charging frequency of the selected lithium ion battery by using a frequency spectrum testing instrument before the lithium ion battery is subjected to first pulse charging, acquiring and converting the charging current of the battery in real time by using a current sensor and an analog-to-digital converter, calculating and processing the current value obtained after conversion by using a digital signal processor, selecting the optimal charging frequency of different stages in the charging process of the battery, and performing pulse charging on the battery by using the optimal charging frequency obtained in each charging stage. According to the method, the pulse power supply is matched with the impedance of the battery, the system reaches the optimal state, more electric energy is converted into chemical energy, and the charging efficiency of the battery is higher.

Description

Lithium ion battery variable frequency pulse charging method and system based on real-time detection
Technical Field
The invention belongs to the technical field of variable-frequency pulse charging of lithium ion batteries, and relates to a method and a system for variable-frequency pulse charging of a lithium ion battery based on real-time detection.
Background
With the continuous development and progress of the battery charging technology, the traditional fixed-frequency pulse charging technology cannot meet the charging requirement of the lithium ion battery, and the variable-frequency pulse charging technology is adopted, so that the polarization effect of the battery is reduced, the cycle service life of the battery is prolonged, meanwhile, the impedance loss of the battery is minimized, the charging energy is maximized, the charging efficiency of the battery is further improved, and the charging time of the battery is shortened.
The invention patent with the application number of CN201910264619.6 discloses a pulse charging optimization method based on a lithium ion battery alternating current impedance equivalent circuit model. The pulse charging optimization method provided by the patent is based on lithium ion battery model parameter identification, and can achieve the purpose of optimization only by obtaining accurate battery model parameters, but the patent adopts fixed frequency to charge the battery, and the optimal system charging state cannot be obtained finally. Because the impedance of the battery is a dynamic nonlinear parameter which changes along with the state of charge of the battery, the impedance of the battery changes all the time in the charging process, so that the optimal charging frequency of the battery also changes in real time, and therefore, in order to fully exert the performance of the lithium ion battery, a variable frequency pulse charging technology is necessary.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a lithium ion battery frequency conversion pulse charging method and system based on real-time detection, so as to solve the technical problems of more battery impedance loss and lower battery charging efficiency caused by mismatching of a pulse charging power supply and battery impedance when a fixed-frequency pulse charging method is used in the traditional method.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a lithium ion battery frequency conversion pulse charging method based on real-time detection comprises two processes, namely an optimal pulse charging frequency searching stage and an optimal pulse charging frequency charging stage; the method specifically comprises the following steps:
the method comprises the following steps: carrying out frequency spectrum analysis on the lithium ion battery to be tested by using a frequency spectrum analyzer to obtain an initial optimal pulse charging frequency value in the initial charging stage of the battery;
step two: controlling a switch of a pulse voltage source by using the initial optimal pulse charging frequency obtained in the first step, generating pulse voltage with the same frequency as the switch frequency, charging the lithium ion battery to be charged by using the pulse voltage, detecting the charging current of the lithium ion battery, and calculating the average charging current value;
step three: step-length disturbance is carried out on the charging frequency of the lithium ion battery to obtain the disturbed charging frequency, the lithium ion battery is continuously charged by using pulse voltage generated by a pulse power supply, the disturbed charging current of the lithium ion battery is detected, and the disturbed average charging current value is calculated;
step four: comparing the average charging current value before disturbance with the average charging current value after disturbance, and keeping the current disturbance step length and direction to start next disturbance when the average charging current value after disturbance is increased; when the average charging current value after disturbance is reduced, reducing the disturbance step length to be half of the step length before disturbance and carrying out reverse disturbance when the step length is disturbed next time;
step five: disturbing according to the disturbance step length and the disturbance direction obtained in the fourth step, repeating the third step and the fourth step until the obtained disturbance step length meets the set condition, and obtaining the optimal pulse charging frequency value of the battery in a charging stage;
step six: and C, controlling a switch of the variable-frequency pulse voltage source according to the optimal pulse charging frequency obtained in the step five, generating pulse voltage with the same frequency as the switching frequency, charging the lithium ion battery by using the voltage, detecting the charging current in the charging process, and finishing the charging of the battery when the charging current of the battery is less than or equal to 1/20C.
Preferably, the specific operation of the step one is as follows: and performing spectrum analysis on the lithium ion battery to be charged by using a spectrum analyzer, determining the value range of the optimal pulse charging frequency of the lithium ion battery to be charged, and selecting the middle point value of the value range of the optimal pulse charging frequency as the optimal pulse charging frequency in the initial charging stage of the variable-frequency pulse.
Preferably, the switch is a metal oxide semiconductor field effect transistor or a triode.
Preferably, the pulse voltage is a series of waveform voltages with different frequencies and same amplitude; the amplitude of the pulse voltage is 4.2V.
Preferably, the charging process is controlled by a digital signal processor.
Preferably, the charging current of the lithium ion battery is not greater than 1C when the lithium ion battery is charged.
Preferably, the time of the optimal pulse charging frequency charging phase is longer than the time of the optimal frequency searching phase.
A lithium ion battery frequency conversion pulse charging system based on real-time detection is disclosed, wherein a detection circuit of the charging current of the lithium ion battery consists of a current sensor and an analog/digital converter; the current sensor is used for collecting charging current in real time; the analog/digital converter is used for converting the collected charging current signal into a digital signal.
Preferably, the current sensor is a hall device.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a lithium ion battery frequency conversion pulse charging method based on real-time detection. Because the battery impedance is continuously changed along with the SOC (state of charge) of the battery, in order to follow the change of the battery impedance, the loss on the battery impedance is minimum, the charging frequency of the battery is correspondingly changed, the value range of the optimal frequency of the variable-frequency pulse charging of the battery can be determined by using a spectrum analyzer, and compared with the traditional method of searching the optimal charging frequency in a large range by using a trial-and-error method, the method disclosed by the invention can obviously save time. The current value obtained after analog-to-digital conversion is calculated by using a digital signal processor, and due to the limitation of the working voltage of the processor, the value can be sent to the processor for processing after amplitude limiting processing. Then, selecting the optimal frequency value of the battery in each charging stage; the optimal charging frequency obtained in each charging stage is utilized to carry out pulse charging on the battery, so that the system reaches the optimal state, more electric energy is converted into chemical energy, and the charging efficiency of the battery is higher.
Further, before the battery is charged, a spectrum analyzer is used for carrying out spectrum analysis on the battery, the value range of the optimal pulse charging frequency of the selected battery is determined, and the middle value in the value range of the optimal charging frequency is selected as the optimal charging frequency in the initial pulse charging stage of the battery, so that a relatively accurate initial charging frequency value is provided when the battery is charged in a variable-frequency pulse mode. In addition, the value is used as the initial optimal pulse charging frequency, which is beneficial to searching the optimal pulse charging frequency value of each charging stage in the variable frequency pulse charging mode.
Furthermore, the switch is a metal oxide semiconductor field effect transistor or a triode which are controllable devices, and the switch is turned on or turned off, so that pulse power supply is performed from a direct current power supply to the battery in an energy mutation mode, and a pulse voltage source is formed together.
Furthermore, the time of the optimal pulse charging frequency charging phase is far longer than that of the optimal frequency searching phase, so that the lithium ion battery is charged in the optimal state.
The invention also discloses a lithium ion battery frequency conversion pulse charging system based on real-time detection, wherein a detection circuit of the charging current of the lithium ion battery consists of a current sensor and an analog/digital converter, and the current sensor adopts a Hall device. Therefore, the variable-frequency pulse charging system is simple in device, strong in operability, strong in practicability and wide in application range.
Drawings
FIG. 1 is a block diagram of a lithium ion battery charging system of the present invention;
FIG. 2 is a flow chart of the average charging current calculation for a lithium ion battery;
FIG. 3 is a flow chart of step size varying disturbance during charging of a lithium ion battery;
FIG. 4 is a circuit diagram of a lithium ion battery charging;
fig. 5 shows waveforms of the lithium ion battery charging pulses.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
example 1
The lithium ion battery of the invention is charged in the frequency conversion pulse based on real-time detectionAn electrical method, as shown in fig. 1, measures the value range of the optimum pulse charging frequency of the selected lithium ion battery by using a frequency spectrum testing instrument before the battery is charged for the first time, and selects a middle value f in the value range of the optimum charging frequencyini_optimalAs the initial optimal pulse charging frequency in the initial charging stage of the variable frequency pulse. This value is then written into the memory of the digital processor. This process is completed before the battery is charged, and this step need not be performed again in the later charging process. Although the charging impedance of the battery can dynamically change along with the SOC, the charging frequency corresponding to the minimum impedance of the lithium ion battery is the initial optimal pulse charging frequency value fini_optimalWill vary within a range and will not vary significantly as the state of charge of the battery changes.
The invention relates to a lithium ion battery variable frequency pulse charging system based on real-time detection, wherein a detection circuit of charging current of a lithium ion battery consists of a current sensor and an analog/digital converter; the current sensor is used for collecting charging current in real time; the analog/digital converter is used for converting the collected charging current signal into a digital signal.
In this embodiment, the current sensor used is a hall device.
The calculation function of the average charging current in fig. 1 is realized by software programming of a digital signal processor, and when the battery is subjected to variable-frequency pulse charging, the current sensor acquires the current magnitude i charged into the battery in real timebConverting the analog quantity into digital quantity N by using an analog-to-digital conversion module arranged in the processoribAnd (6) carrying out data processing. In order to make the acquired current data more accurate, the invention uses a method of averaging by multiple sampling, and avoids errors caused by current fluctuation.
FIG. 2 shows a flow chart for calculating the average charging current, in which when the battery starts to be charged, the initial frequency is f1Charging the lithium ion battery by the pulse voltage of (N)ib,1(m) when the pulse charging voltage frequency of the battery is f1In the time, the value of M ranges from 1 to M, namely, the charging current digital value collected at the M-th timeAt a charging frequency of f1In time, current collection was performed M times in total. N is a radical ofacc(n) is at a charging frequency of fnIn the case of (1), the cumulative sum of the charging currents is collected M times, where N isaccThe initial value of (n) is 0. N is a radical ofacc(1) I.e. at a charging frequency f1Then, the sum of the charging currents is collected M times. It can be seen that at a charging frequency f1In the meantime, if the number of times of collecting the battery charging current is less than M times, 1/(f) needs to be delayednM), continuously collecting the charging current for accumulation and summation, wherein the collection times reach M times, and the accumulated sum N of the current is obtainedacc(1). Then, by the formula Navg(n)＝Nacc(n)/M, the charging frequency is fnAnd (4) acquiring the average value of the charging current of the battery after M times of charging current acquisition. N is a radical ofavg(1) I.e. the charging frequency is f1The average value of the battery charging current. And then, changing the frequency of the pulse charging voltage to obtain the average value of the battery charging current under different charging frequencies.
It is generally considered that when a lithium ion battery is fully charged, the charging current is equal to or less than 1/20C, and C represents the charge/discharge rate of the battery and represents the magnitude of the charge/discharge current. Therefore, once it is detected that the battery charging current is less than or equal to 1/20C, the battery charging ends.
The optimum pulse charging frequency searching function in fig. 1 is also implemented by software programming of a digital signal processor, and a frequency variable step size disturbance observation method is adopted. At the beginning with frequency fini_optimalThe battery is charged by the pulse voltage, the impedance of the battery changes along with the charging, and the optimal pulse charging frequency of the battery also changes. And (3) obtaining the average value of the charging current with different pulse frequencies by detecting the charging current in real time to track the change of the optimal pulse charging frequency so as to obtain the optimal pulse frequency values in different charging stages.
The method adopts a step successive approximation method to search the optimal pulse charging frequency, and the specific disturbance process is as follows; obtaining the initial optimal pulse charging frequency value f of the battery in the initial charging stage after using a spectrum analyzerini_optimalBased on the frequencyThe disturbance is carried out with a small step length delta f, and if N always exists before the i +1 th frequency disturbanceavg(n+1)＞Navg(n < i), indicating that the frequency point does not exceed the optimal frequency point at the moment, and continuously keeping the current step length and the direction disturbance; when N is presentavg(i+1)<Navg(i) And then, the frequency point just passes through the optimal pulse frequency point, the range of the optimal pulse frequency point is deduced to be within the range of delta f of the current frequency point, the step length is changed, the disturbance is carried out in the opposite direction by the delta f/2 step length until the change of the average charging current direction occurs, at the moment, the range of the optimal pulse frequency point is within the delta f/2 range, and the tracking precision is improved by 1 time. And repeating the steps until the disturbance step size is reduced to a certain value, and judging that the system is stabilized at the optimal pulse frequency point.
The frequency variable step size perturbation process is represented by a flow chart as shown in fig. 3. The battery starts to charge, and the default initial charging frequency is f1Here f1And f aboveini_optimalAnd (4) detecting the charging current at the moment and calculating the average charging current value of the battery when the values are equal. And then, disturbing the initial charging frequency by the step length delta f, detecting the battery charging current corresponding to the disturbed charging frequency and calculating the average charging current value of the battery. And then, comparing the average charging current values before and after the disturbance, and judging whether the size and the direction of the disturbance step length need to be adjusted. If the average charging current value after disturbance is increased, keeping the current disturbance step length and direction to start next disturbance; and if the average charging current value after the disturbance is reduced, reducing the disturbance step size to be half of the original one and carrying out reverse-direction disturbance. Repeating the steps until the disturbance step length is reduced to a certain specific value, and judging the battery charging frequency f at the momentchargeThe value is the optimal charging frequency value of the battery in the stage of pulse charging, wherein the value represents the searching precision of the optimal charging frequency, and the smaller the value is, the higher the searching precision is and the longer the time consumption is; the larger the value, the opposite.
The generation process of the variable frequency pulse voltage is shown in FIG. 4, V in FIG. 4ccThe lithium ion battery is a direct current voltage source and is fully charged with voltage, generally 4.2v/cell, therefore VccIs set to 4.2. The switch SW can be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or a triode, but must be a controllable device, and the switch SW is turned on or off, so that the battery is supplied with power in a pulse mode from a direct current power supply in an energy mutation mode, and a pulse voltage source is formed together. The controller selected by the charging system is a Digital Signal Processor (DSP), and the controller modulates a control pulse so as to control the switching tube SW to carry out switching-on and switching-off operations at a required frequency. In FIG. 4, RLThe current limiting resistor plays a role in current limiting protection. According to the requirements of battery manufacturers, the safe charging current of a general lithium ion battery during charging is not more than 1C. Battery charging current ibThe detection circuit consists of a current sensor and an analog/digital converter ADC, and the current sensor can adopt a high-precision Hall device. According to the requirement, i isbThe measurement results are provided to a controller, the controller being further configured to provide a measurement result based on ibThe result is measured to generate a control pulse.
The effect of the charging pulse generated by the pulse voltage is shown in fig. 5, and it can be seen that the charging voltage generated by the charging system is a series of variable frequency pulse voltage waveforms with different frequencies but 4.2V amplitudes. FIG. 5 shows that a battery charging phase according to the requirements of the present invention includes a battery charging optimum frequency searching phase TSCharging stage T with optimal pulse charging frequencyCIt should be noted that the charging phase takes much longer than the frequency searching phase, i.e. TC＞＞TSThis ensures that the battery is charged in an optimum state. T in FIG. 5SStage search to frequency fiFrequency of pulse charging, frequency f, optimum for the batteryiCorresponding Navg(i) Maximum during this charging phase, after which TCPhase use frequency fiAnd carrying out pulse charging on the lithium ion battery.
In summary, according to the lithium ion battery frequency conversion pulse charging method based on real-time detection provided by the invention, the battery is subjected to pulse charging by using the optimal charging frequency obtained in each charging stage, the pulse power supply is matched with the impedance of the battery, the system reaches the optimal state, more electric energy is converted into chemical energy, and the charging efficiency of the battery is higher. The pulse charging method can solve the problems that when the lithium ion battery is charged by using a fixed pulse frequency, the impedance of the pulse power supply is not matched with the impedance of the battery, so that the impedance consumption energy of the battery is increased, and the charging efficiency of the battery is reduced.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (9)

1. A lithium ion battery frequency conversion pulse charging method based on real-time detection is characterized by comprising two processes, namely an optimal pulse charging frequency searching stage and an optimal pulse charging frequency charging stage; the method specifically comprises the following steps:
the method comprises the following steps: carrying out frequency spectrum analysis on the lithium ion battery to be tested by using a frequency spectrum analyzer to obtain an initial optimal pulse charging frequency value in the initial charging stage of the battery;
step two: controlling a switch of a pulse voltage source by using the initial optimal pulse charging frequency obtained in the first step, generating pulse voltage with the same frequency as the switch frequency, charging the lithium ion battery to be charged by using the pulse voltage, detecting the charging current of the lithium ion battery, and calculating the average charging current value;
step three: step-length disturbance is carried out on the charging frequency of the lithium ion battery to obtain the disturbed charging frequency, the lithium ion battery is continuously charged by using pulse voltage generated by a pulse power supply, the disturbed charging current of the lithium ion battery is detected, and the disturbed average charging current value is calculated;
step four: comparing the average charging current value before disturbance with the average charging current value after disturbance, and keeping the current disturbance step length and direction to start next disturbance when the average charging current value after disturbance is increased; when the average charging current value after disturbance is reduced, reducing the disturbance step length to be half of the step length before disturbance and carrying out reverse disturbance when the step length is disturbed next time;
step five: disturbing according to the disturbance step length and the disturbance direction obtained in the fourth step, repeating the third step and the fourth step until the obtained disturbance step length meets the set condition, and obtaining the optimal pulse charging frequency value of the battery in a charging stage;
step six: and C, controlling a switch of the variable-frequency pulse voltage source according to the optimal pulse charging frequency obtained in the step five, generating pulse voltage with the same frequency as the switching frequency, charging the lithium ion battery by using the voltage, detecting the charging current in the charging process, and finishing the charging of the battery when the charging current of the battery is less than or equal to 1/20C.
2. The lithium ion battery frequency conversion pulse charging method based on real-time detection according to claim 1, characterized in that the specific operation of step one is as follows: and performing spectrum analysis on the lithium ion battery to be charged by using a spectrum analyzer, determining the value range of the optimal pulse charging frequency of the lithium ion battery to be charged, and selecting the middle point value of the value range of the optimal pulse charging frequency as the optimal pulse charging frequency in the initial charging stage of the variable-frequency pulse.
3. The lithium ion battery frequency conversion pulse charging method based on real-time detection according to claim 1, wherein the switch is a metal oxide semiconductor field effect transistor or a triode.
4. The lithium ion battery frequency conversion pulse charging method based on real-time detection according to claim 1, wherein the pulse voltage is a series of voltages with different frequencies and same amplitude; the amplitude of the pulse voltage is 4.2V.
5. The lithium ion battery variable frequency pulse charging method based on real-time detection according to claim 1, wherein the charging process uses a digital signal processor as a controller.
6. The lithium ion battery frequency conversion pulse charging method based on real-time detection according to claim 1, wherein the charging current is not greater than 1C when the lithium ion battery is charged.
7. The lithium ion battery frequency conversion pulse charging method based on real-time detection according to claim 1, wherein the time of the optimal pulse charging frequency charging phase is longer than the time of the optimal frequency searching phase.
8. The lithium ion battery frequency conversion pulse charging system based on real-time detection established according to any one of claims 1 to 7, wherein the detection circuit of the charging current of the lithium ion battery is composed of a current sensor and an analog/digital converter; the current sensor is used for collecting charging current in real time; the analog/digital converter is used for converting the collected charging current signal into a digital signal.
9. The lithium ion battery variable frequency pulse charging system based on real-time detection of claim 8, wherein the current sensor is a hall device.
CN202010752775.XA 2020-07-30 2020-07-30 Lithium ion battery variable frequency pulse charging method and system based on real-time detection Pending CN111755765A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112928351A (en) * 2021-02-10 2021-06-08 中国科学院金属研究所 Pulse charging technology of lithium-sulfur battery
CN113258152A (en) * 2021-05-11 2021-08-13 浙江大学 Variable frequency pulse formation method based on optimal frequency of lithium ion battery

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Publication number Priority date Publication date Assignee Title
CN103682499A (en) * 2013-12-23 2014-03-26 湖北工业大学 Variable-frequency pulse charging method for lithium ion batteries of hybrid cars
US20150295443A1 (en) * 2012-12-26 2015-10-15 Colorado Energy Research Technologies, LLC Power Recovery Controller
CN209119267U (en) * 2018-03-02 2019-07-16 天津九九电子有限公司 A kind of noninductive charger of dual pwm modulation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150295443A1 (en) * 2012-12-26 2015-10-15 Colorado Energy Research Technologies, LLC Power Recovery Controller
CN103682499A (en) * 2013-12-23 2014-03-26 湖北工业大学 Variable-frequency pulse charging method for lithium ion batteries of hybrid cars
CN209119267U (en) * 2018-03-02 2019-07-16 天津九九电子有限公司 A kind of noninductive charger of dual pwm modulation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112928351A (en) * 2021-02-10 2021-06-08 中国科学院金属研究所 Pulse charging technology of lithium-sulfur battery
CN113258152A (en) * 2021-05-11 2021-08-13 浙江大学 Variable frequency pulse formation method based on optimal frequency of lithium ion battery

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Application publication date: 20201009