CN115528324B - Method and device for suppressing ripple waves of online repair of storage battery pack - Google Patents

Method and device for suppressing ripple waves of online repair of storage battery pack Download PDF

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CN115528324B
CN115528324B CN202211329014.9A CN202211329014A CN115528324B CN 115528324 B CN115528324 B CN 115528324B CN 202211329014 A CN202211329014 A CN 202211329014A CN 115528324 B CN115528324 B CN 115528324B
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frequency oscillation
battery
pair
oscillation waveform
single battery
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CN115528324A (en
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张宏波
马孝栋
邢伊涵
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Beijing Zhouhainenghuan Technology Co ltd
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Beijing Zhouhainenghuan 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
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • 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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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a method and a device for suppressing ripple waves generated by on-line repair of a storage battery, belongs to the technical field of storage batteries, and solves the problem of ripple wave interference of the ripple waves generated by on-line repair of the storage battery on equipment and environment. The method comprises the following steps: measuring the impedance of N single batteries in the storage battery pack; comparing and pairing the impedances, and taking two single batteries with the same or similar impedance as a single battery pair to divide N single batteries into N/2 single battery pairs; generating N/2 high-frequency oscillation waveforms with different amplitudes and frequencies according to the impedance values of the N/2 single battery pairs; the high-frequency oscillation waveforms are converted into two high-frequency oscillation waveforms with opposite directions, and the control switches of the corresponding single battery pairs are synchronously switched on, so that the two high-frequency oscillation waveforms with opposite waveform directions are synchronously applied to the corresponding single battery pairs in the first to N/2 single battery pairs for cyclic and alternating repair. The ripple effect of the two opposite high-frequency oscillation waveforms superimposed on the whole set of cells is close to zero.

Description

Method and device for suppressing ripple waves of online repair of storage battery pack
Technical Field
The invention relates to the technical field of storage batteries, in particular to a method and a device for suppressing on-line repairing ripple waves of a storage battery pack.
Background
Lead-acid accumulator is one accumulator with electrode mainly made of lead and its oxide and electrolyte solution of sulfuric acid. The lead-acid storage battery has become a storage battery variety with large output and wide application due to the characteristics of low price, easily available raw materials, reliable performance, easy recovery, suitability for large-current discharge and the like. The lead-acid storage battery is widely applied to various fields of automobiles, communication, electric power, railways, electric vehicles and the like, but the short service life of the lead-acid storage battery is a main short plate, so that the fatal defects of short service life and rapid capacity reduction of the lead-acid storage battery caused by vulcanization cause are thoroughly solved, and the lead-acid storage battery becomes a main research direction of a storage battery repair technology.
The failure of the lead-acid storage battery has great relation with factors such as a generation process, a use mode, environment and the like. The failure of the battery is that the internal resistance of the battery is increased due to dehydration accompanied with vulcanization, and the battery generates heat in the charging process after the capacity of the battery is reduced, so that the softening, corrosion and swelling of the polar plate occur due to the excessive electrolyte density after the dehydration and vulcanization to a certain degree, and the vulcanization (lead sulfate crystallization) is the root cause of the battery failure.
Reasons for battery vulcanization include the following abnormal use: high-current discharge, low-current deep discharge, untimely charging, long-term rest and no discharge under long-time floating charge conditions.
Lead sulfate can be formed in electrolyte when the lead-acid storage battery works in a discharging state, crystallization can occur when the concentration of the lead sulfate reaches a certain threshold value, and the crystallized lead sulfate can not participate in a circulating reaction any more, so that the capacity of the lead-acid storage battery is reduced.
The lead-acid storage battery is widely applied to power storage in power, military, traffic, communication and financial industries, a data center, a base station and a standby power supply of various devices running in a severe environment, and the manual maintenance cost of the storage battery is high, so that the lead-acid storage battery has wide market and technical requirements on-line maintenance of the battery and prolonging of service life through sulfur removal; the on-line maintenance and sulfur removal technology of the lead-acid storage battery has huge market space and profound socioeconomic significance in the aspects of green and environment-friendly development and social energy conservation.
The method for maintaining the lead-acid storage battery sulfuration commonly used at present is high-frequency resonance restoration, namely resonance is generated between high-frequency resonance current and the sulfurated lead sulfate crystal, so that the lead sulfate crystal is broken, the lead sulfate crystal can participate in a circulating reaction again, and the aim of restoring the capacity of the storage battery is finally achieved.
According to the principles of atomic physics and solid physics, sulfide ions have 5 different energy level states, and ions that are normally in a metastable energy level state tend to migrate to the most stable covalent bond energy level to exist. At the lowest energy level (i.e., covalent bond energy level state), sulfur exists as a ring-shaped molecule comprising 8 atoms, which is a stable combination that is difficult to break up, forming the unpalatable sulfation-sulfidation of the cell. This occurs many times, and a layer of lead sulfate crystals similar to the insulating layer is formed.
To break up the binding of these sulfate layers, the energy level of the atoms is raised to a certain extent, at which time the electrons carried by the outer atoms are activated to the next higher energy band, releasing the binding between the atoms. Each specific energy level has a unique resonant frequency and some energy must be supplied to cause the activated molecule to migrate to a higher energy level state, too low energy to meet the energy requirements for the transition, but too high energy will cause the atoms that have been unbound to transition to be in an unstable state and fall back to the original energy level. Therefore, the ion must be released from the binding by resonance a plurality of times to reach the most active energy state without falling back to the original energy level, and thus, the ion is converted into free ions dissolved in the electrolyte to participate in the electrochemical reaction.
When repairing lead-acid storage batteries, crystals with different lead sulfate grain sizes have different corresponding resonance frequencies. If a pulse current with a steep front edge is adopted, the frequency analysis is performed by utilizing the Fourier series, so that the pulse can generate rich harmonic components, the amplitude of a low-frequency part is large, and the amplitude of a high-frequency part is small. Thus, the large lead sulfate crystals obtain large energy and the small lead sulfate crystals obtain small energy. The technical principle of repairing and maintaining the high-frequency oscillation waveform is that the lead sulfate coarse grains are impacted by using the energy of the high-frequency oscillation waveform to enable the pulse frequency of the lead sulfate coarse grains to resonate with the natural frequency of the lead sulfate crystals, when the energy is enough, the lead sulfate crystals which cannot be reduced by charging the storage battery in the actual use environment are broken and dissolved in sulfuric acid electrolyte to participate in chemical reaction again, so that the service life of the battery is prolonged, and the safety and reliability of a power supply system are improved.
In the existing on-line storage battery whole-group repairing process, a high-frequency oscillation waveform is applied to the running battery group, and the high-frequency oscillation waveform needs to be characterized in that: 1. sufficient energy, 2, abundant frequency characteristics. The high frequency oscillations, because of their inherent waveform characteristics, inevitably generate electromagnetic ripple, creating operational safety hazards to other devices connected to the battery circuit.
In order to reduce the influence of ripple interference on operation equipment and environment, manufacturers reduce the ripple value by reducing the amplitude of a high-frequency oscillation waveform, but the reduction of the amplitude energy of a pulse waveform causes failure in repairing large-particle lead sulfate crystals because the large-particle lead sulfate crystals cannot provide enough breaking energy; there are also manufacturers that reduce the ripple effect by adding a filter circuit to the apparatus, but because of the foregoing characteristics, the high frequency oscillation pulse waveform is composed of waveforms of different frequencies and amplitudes, the low frequency part of which has a large amplitude and the high frequency part of which has a small amplitude. Therefore, the large energy obtained by the large lead sulfate crystals and the small energy obtained by the small lead sulfate crystals can be ensured, the high-frequency oscillation pulse waveform is complex, and the ripple wave generated by the pulse waveform can not be completely filtered by a simple filter circuit. Therefore, the technical innovation and perfection of ripple interference suppression derived from the current high-frequency oscillation waveform repairing method are a key technical bottleneck for restricting the popularization and development of the on-line maintenance technology, and the effects that a large amount of storage battery resources cannot play a hundred percent and the maintenance cost is high are indirectly caused, which are contrary to the current social development ideas of environmental protection and energy conservation.
Disclosure of Invention
In view of the above analysis, the embodiment of the invention aims to provide a method and a device for suppressing the ripple of the online repair of a storage battery pack, which are used for solving the problem of ripple interference of the ripple generated during the online repair of the existing storage battery on running equipment and environment.
In one aspect, an embodiment of the present invention provides a method for suppressing on-line repair ripple of a storage battery, including: measuring the impedance of N single batteries in the storage battery pack through a battery impedance measuring unit; comparing and pairing the impedance of N single batteries in the storage battery pack, and taking two single batteries with the same or similar impedance as a single battery pair and storing the position information of paired single batteries so as to divide the N single batteries into N/2 single battery pairs; generating high-frequency oscillation waveform signal information of amplitude and frequency corresponding to different impedance values according to different impedance values of N/2 single battery pairs by a core control unit, and storing the high-frequency oscillation waveform signal information in a register; and outputting the stored high-frequency oscillation waveform signal information corresponding to the first single battery pair into a high-frequency oscillation waveform signal through PWM control by the core control unit, and synchronously switching on a control switch of the first single battery pair so as to apply the two high-frequency oscillation waveforms with opposite waveform directions to the first single battery pair, wherein the synchronous control power amplification unit converts the high-frequency oscillation waveform signal into two high-frequency oscillation waveforms with opposite waveform directions and equal amplitude; sequentially applying two high-frequency oscillation waveform signals with opposite waveform directions and equal amplitudes respectively corresponding to a second single battery pair to an N/2 th single battery pair to the second single battery pair to the N/2 th single battery pair in a time sharing manner according to the same method; and carrying out cyclic repair on the N/2 single battery pairs.
The beneficial effects of the technical scheme are as follows: the on-line repairing ripple suppression device for the storage battery packs repairs the two batteries with similar impedance as a pair by carrying out impedance measurement on each battery in the whole battery pack, so that the repairing efficiency of the whole battery pack is improved, and meanwhile, the ripple effect generated on the whole battery pack by superposition is close to zero because the applied high-frequency oscillation waveforms are equal in amplitude and opposite in phase, so that the technical problem of ripple interference influence generated by on-line maintenance of the lead-acid storage battery is thoroughly solved.
Based on a further improvement of the above method, measuring the impedance of the N unit cells in the battery pack by the cell impedance measurement unit further includes: starting a constant current source based on control pulses output by a core control unit, so that the constant current source outputs special-frequency current with a specific amplitude; based on the switch control signals synchronously output by the core control unit, the N single batteries are in time-sharing connection so as to output the special-frequency current with the specific amplitude to each single battery; simultaneously starting an analog quantity acquisition function of the core control unit to acquire voltage signals at two ends of the corresponding single battery; and calculating the impedance of each single battery according to the voltage signals at the two ends of the single battery and the specific frequency current with the specific amplitude.
Based on a further improvement of the above method, converting the high-frequency oscillation waveform signal into two high-frequency oscillation waveforms with opposite waveform directions by synchronously controlling the power amplification unit includes: inverting the high-frequency oscillation waveform signal through an inverting circuit of the synchronous control power amplification unit to generate a high-frequency oscillation waveform signal with opposite phases and equal amplitude and amplifying the high-frequency oscillation waveform signal into a first high-frequency oscillation waveform signal; and converting the high-frequency oscillation waveform signal into a high-frequency oscillation waveform signal with the same phase and the same amplitude by a forward follower circuit of the synchronous control power amplification unit and amplifying the same into a second high-frequency oscillation waveform signal, so that the amplitudes of the first high-frequency oscillation waveform signal and the second high-frequency oscillation waveform signal are equal and opposite.
Based on a further improvement of the above method, time-sharing application of two high-frequency oscillation waveform signals respectively opposite to waveform directions of the first to N/2 th cell pairs to the first to N/2 th cell pairs includes: when the same single cell pair in the storage battery pack is repaired for the first time, the first high-frequency oscillation waveform signal is applied to a first single cell in the same single cell pair, and the second high-frequency oscillation waveform signal is applied to a second single cell in the same single cell pair; and applying the first high-frequency oscillating waveform signal to a second cell in the same cell pair and applying the second high-frequency oscillating waveform signal to a first cell in the same cell pair when a subsequent second repair is performed on the same cell pair in the battery pack.
On the other hand, the embodiment of the invention provides an on-line repairing ripple suppression device for a storage battery, which comprises the following components: the battery impedance measuring unit is used for measuring the impedance of N single batteries in the storage battery pack; the core control unit is used for comparing and pairing the impedance of N single batteries in the storage battery pack, taking two single batteries with the same or similar impedance as a single battery pair, storing the position information of the paired single batteries, dividing the N single batteries into N/2 single battery pairs, generating high-frequency oscillation waveform signal information with amplitude and frequency corresponding to different impedance values according to different impedance values of the N/2 single battery pairs, and storing the high-frequency oscillation waveform signal information in a register; the stored high-frequency oscillation waveform signal information corresponding to the first single battery pair to the N/2 single battery pair is output into N/2 high-frequency oscillation waveform signals in a time-sharing mode through PWM control; and a synchronous control power amplification unit for time-sharing converting the N/2 high-frequency oscillation waveform signals into two high-frequency oscillation waveforms with opposite waveform directions, and synchronously switching on the control switches of the corresponding first to N/2 th single battery pairs in a time-sharing manner, so that the two high-frequency oscillation waveforms with the same amplitude as the opposite waveform directions of the first to N/2 th single battery pairs are applied to the first to N/2 th single battery pairs in a time-sharing manner.
Based on a further improvement of the above device, the battery impedance measurement unit comprises a constant current source and a switching transistor, wherein the positive electrode of the constant current source is connected to the source electrode of the switching transistor, and the negative electrode of the constant current source is used as a second output end of the constant current source for generating a current with specific amplitude and frequency; and the grid electrode of the switching transistor is connected with the switching signal interface of the core control unit, and the drain electrode of the switching transistor is used as the first output end of the constant current source, wherein the switching transistor is turned on or turned off according to the pulse control signal received by the grid electrode, so that the switching transistor generates the special frequency current.
Based on the further improvement of the device, the storage battery online repairing ripple suppression device also comprises N groups of battery impedance measuring switches, wherein the core control unit is used for synchronously outputting a measuring switch control signal; the N groups of battery impedance measurement switches are used for switching on each battery impedance measurement switch in the N groups of battery impedance measurement switches in a time-sharing manner based on the measurement switch control signals so as to apply the specific frequency current with the specific amplitude to each single battery in a time-sharing manner, wherein the N groups of battery impedance measurement switches are in one-to-one correspondence with the N single batteries; the core control unit is used for collecting voltage signals at two ends of corresponding single batteries and calculating the impedance of each single battery according to the voltage signals and the specific frequency current with the specific amplitude.
Based on the further improvement of the device, the synchronous control power amplifier unit comprises: the device comprises an inverting circuit, a first isolation power amplifier module, a forward following circuit and a second isolation power amplifier module, wherein the inverting circuit is used for inverting the high-frequency oscillation waveform signals to generate high-frequency oscillation waveform signals with opposite phases and equal amplitude; the first isolation power amplification module is used for carrying out isolation amplification on the high-frequency oscillation waveform signals with opposite phases and equal amplitude values so as to generate a first high-frequency oscillation waveform signal; the forward following circuit is used for following the high-frequency oscillation waveform signals to generate high-frequency oscillation waveform signals with the same phase and the same amplitude; and the second isolation power amplification module is used for carrying out isolation amplification on the high-frequency oscillation waveform signals with the same phase and the same amplitude so as to generate a second high-frequency oscillation waveform signal.
Based on a further improvement of the above arrangement, the forward follower circuit comprises a first operational amplifier and a first resistor, wherein an inverting input of the first operational amplifier is connected to an output of the first operational amplifier; the non-inverting input end of the first operational amplifier is connected with the PWM output interface of the core processing unit through the first resistor; the inverting circuit comprises a second operational amplifier, a second resistor and a third resistor, wherein the non-inverting input end of the second operational amplifier is grounded, the inverting input end of the second operational amplifier is connected with the PWM output interface of the core processing unit through the second resistor, and the output end of the second operational amplifier is connected to the inverting input end of the second operational amplifier through the third resistor.
Based on the further improvement of the device, the core control unit is used for outputting a first selection switch control signal when the same single battery pair in the storage battery pack is repaired for the first time, and controlling the first switch pair in the first group of switch pairs and the first switch pair in the second group of switch pairs to be connected, so that the output end of the first isolation power amplifier module is connected to the first single battery in the same single battery pair, and the output end of the second isolation power amplifier module is connected to the second single battery in the same single battery pair; and when the same single battery pair in the storage battery pack is repaired for the next time, outputting a second selection switch control signal to control a second switch pair in the first group of selection switches and a second switch pair in the second group of selection switches to be connected, so that the output end of the first isolation power amplifier module is connected to a second single battery in the same single battery pair, and the output end of the second isolation power amplifier module is connected to a first single battery in the same single battery pair.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. The on-line repairing ripple suppression device for the storage battery packs repairs the two batteries with similar impedance as a pair by carrying out impedance measurement on each battery in the whole battery pack, so that the repairing efficiency of the whole battery pack is improved, and meanwhile, the ripple effect generated on the whole battery pack by superposition is close to zero because the applied high-frequency oscillation waveforms are equal in amplitude and opposite in phase, so that the technical problem of ripple interference influence generated by on-line maintenance of the lead-acid storage battery is thoroughly solved.
2. The on-line repairing ripple suppression device for the storage battery pack has the advantages that due to the circuit design characteristics that the high-frequency oscillation waveforms applied during on-line maintenance are equal in amplitude and opposite in phase, the amplitude of the low-frequency pulse can be properly improved, large ripple interference can not be generated, and the technical advantage of a larger maintenance range is provided for the whole on-line maintenance technology.
3. The on-line repairing ripple suppression device of the storage battery solves the problems that the adopted hardware filtering method cannot adapt to and completely solve the generation of ripple waves and the ripple wave interference to a system and the environment due to different amplitude frequency waveform characteristics provided for large crystals and small crystals due to the circuit design characteristics that the amplitude of high-frequency oscillation waveforms applied during on-line repairing are equal and opposite in phase. The waveforms applied to a pair of cells to be repaired, regardless of the frequency and amplitude values, have the same amplitude and opposite phase waveforms applied synchronously to a group of cell pairs, and the ripple superposition effect of the whole group of cells is maintained at an extremely low level.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
Fig. 1 is a block diagram of a secondary battery pack on-line repair ripple suppression apparatus according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a battery impedance measurement unit of the on-line repairing ripple suppression apparatus of the battery pack according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a typical characteristic of a high-frequency oscillation waveform of a battery impedance measurement of a battery pack on-line repair ripple suppression device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a synchronous control power amplifier unit of a storage battery pack on-line repairing ripple suppression device according to an embodiment of the present invention;
FIG. 5 is a flowchart of a method for suppressing ripple on-line repair of a battery pack according to an embodiment of the present invention; and
fig. 6 is a basic flowchart of a method for suppressing ripple of an on-line repair of a battery pack according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
Referring to fig. 6, in one embodiment of the present invention, a method for suppressing ripple on-line repair of a battery pack is disclosed, comprising: in step S602, the impedances of N unit cells in the battery pack are measured by the cell impedance measurement unit; in step S604, the impedances of N single batteries in the battery pack are compared and paired, and two single batteries with the same or similar impedance are used as a single battery pair and position information of paired single batteries is stored, so that the N single batteries are divided into N/2 single battery pairs; in step S606, the core control unit generates high-frequency oscillation waveform signal information of amplitude and frequency corresponding to different impedance values according to the different impedance values of the N/2 single battery pairs and stores the information in the register; in step S608, the stored high-frequency oscillation waveform signal information corresponding to the first single cell pair is outputted as a high-frequency oscillation waveform signal through PWM control by the core control unit, the high-frequency oscillation waveform signal is converted into two high-frequency oscillation waveforms with equal waveform direction opposite magnitudes by the synchronous control power amplification unit, and the control switch of the first single cell pair is turned on synchronously, so that the two high-frequency oscillation waveforms with equal waveform direction opposite magnitudes are applied to the first single cell pair; applying two high-frequency oscillation waveform signals with opposite waveform direction and equal amplitude values respectively corresponding to the second single battery pair to the N/2 single battery pair in a time sharing manner according to the same method sequence; and in step S110, the N/2 single battery pairs are circularly repaired.
Compared with the prior art, the on-line repairing ripple suppression device for the storage battery pack has the advantages that through impedance measurement of each battery in the whole battery pack, two batteries with similar impedance are used as a pair for repairing, the repairing efficiency of the whole battery pack is improved, meanwhile, the ripple effect generated on the whole battery pack by superposition is close to zero because the applied high-frequency oscillation waveforms are equal in amplitude and opposite in phase, and therefore the technical problem of ripple interference influence generated by on-line maintenance of the lead-acid storage battery is thoroughly solved.
Hereinafter, each step of the battery pack on-line repair ripple suppression method according to the embodiment of the present invention will be described in detail with reference to fig. 6.
In step S602, the impedances of N unit cells in the battery pack are measured by the cell impedance measurement unit. The core control unit is used for calculating the static impedance value of each single battery in the storage battery pack according to the special frequency voltage and the special frequency pulse current. Specifically, measuring the impedance of N unit cells in the battery pack by the cell impedance measurement unit further includes: starting a constant current source based on control pulses output by a core control unit, so that the constant current source outputs special-frequency current with a specific amplitude; based on the switch control signals synchronously output by the core control unit, the N single batteries are switched on in a time-sharing way so as to output special-frequency current with specific amplitude to each single battery; simultaneously starting an analog quantity acquisition function of the core control unit to acquire voltage signals at two ends of the corresponding single battery; and calculating the impedance of each single battery according to the voltage signals at the two ends of the single battery and the special frequency current with a specific amplitude.
In step S604, the impedances of the N unit cells in the battery pack are compared and paired, and two unit cells having the same or similar impedance are used as one unit cell pair and the position information of the paired unit cells is stored, so as to divide the N unit cells into N/2 unit cell pairs.
In step S606, the high-frequency oscillation waveform signal information of different magnitudes and frequencies corresponding to the different impedance values is generated by the core control unit according to the different impedance values of the N/2 single cell pairs and stored in the register. I.e., each cell pair may correspond to a high frequency oscillating waveform signal information of a certain amplitude and frequency.
In step S608, the core control unit outputs the stored high-frequency oscillation waveform signal information corresponding to the first unit cell pair as a high-frequency oscillation waveform signal through PWM control and outputs the high-frequency oscillation waveform signal to the synchronous control power amplification unit through the PWM output interface. The high-frequency oscillation waveform signals are converted into two high-frequency oscillation waveforms with the same amplitude in opposite waveform directions through the synchronous control power amplification unit, and the control switch of the first single battery pair is synchronously connected, so that the two high-frequency oscillation waveforms with the same amplitude in opposite waveform directions are applied to the first single battery pair; then the stored high-frequency oscillation waveform signal information corresponding to the second single battery pair is output to a high-frequency oscillation waveform signal through PWM control by a core control unit and is output to a synchronous control power amplification unit through a PWM output interface, the high-frequency oscillation waveform signal is converted into two high-frequency oscillation waveforms with opposite waveform directions and equal amplitude by the synchronous control power amplification unit, and a control switch of the second single battery pair is synchronously connected, so that the two high-frequency oscillation waveforms with opposite waveform directions and equal amplitude are applied to the second single battery pair; … the stored high-frequency oscillation waveform signal information corresponding to the N/2 th single battery pair is outputted to the synchronous control power amplification unit in a time-sharing manner through the PWM output interface by the core control unit, the high-frequency oscillation waveform signal is converted into two high-frequency oscillation waveforms with opposite waveform directions and equal amplitude by the synchronous control power amplification unit, and the control switch of the N/2 th single battery pair is synchronously connected, so that the two high-frequency oscillation waveforms with opposite waveform directions and equal amplitude are applied to the N/2 th single battery pair.
Specifically, converting the high-frequency oscillation waveform signal into two high-frequency oscillation waveforms with opposite waveform directions by synchronously controlling the power amplification unit includes: inverting the high-frequency oscillation waveform signal through an inverting circuit of the synchronous control power amplification unit to generate a high-frequency oscillation waveform signal with opposite phases and equal amplitude and amplifying the high-frequency oscillation waveform signal into a first high-frequency oscillation waveform signal; and converting the high-frequency oscillation waveform signal into a high-frequency oscillation waveform signal with the same phase and the same amplitude by synchronously controlling a forward follower circuit of the power amplification unit and amplifying the high-frequency oscillation waveform signal into a second high-frequency oscillation waveform signal, so that the amplitudes of the first high-frequency oscillation waveform signal and the second high-frequency oscillation waveform signal are equal and the phases are opposite.
Applying two high-frequency oscillation waveform signals respectively opposite to the waveform directions of the first to the N/2 th unit cell pairs to the first to the N/2 th unit cell pairs in a time-sharing manner includes: when the same single cell pair in the storage battery pack is repaired for the first time, a first high-frequency oscillation waveform signal is applied to a first single cell in the same single cell pair, and a second high-frequency oscillation waveform signal is applied to a second single cell in the same single cell pair; and applying the first high-frequency oscillating waveform signal to a second cell in the same cell pair and applying the second high-frequency oscillating waveform signal to a first cell in the same cell pair when the same cell pair in the battery pack is subjected to a subsequent second repair.
In step S110, the N/2 single battery pairs are circularly repaired. Specifically, the steps S102 to S108 are repeated as a repair cycle, and the N/2 cell pairs are circularly repaired. Specifically, generating composite pulse harmonic voltages with different frequency voltage amplitudes through a PWM modulation mode according to the change rate of the impedance value in the repairing period, and outputting the composite pulse harmonic voltages to a composite pulse harmonic repairing unit, wherein when the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltages are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and is larger than the static impedance value of the normal battery.
Referring to fig. 1, another embodiment of the present invention discloses an on-line repair ripple suppression device for a battery pack, comprising: a battery impedance measuring unit 100, a secondary battery pack (i.e., an entire group of battery cells 130), a core control unit 110, and a synchronous control power amplifying unit 120.
The battery impedance measurement unit 100 is used for measuring the impedance of N unit batteries in the battery pack. Referring to fig. 2, the battery impedance measuring unit 100 includes a constant current source HI and a switching transistor. The positive pole of the constant current source HI is connected to the source of the switching transistor, and the negative pole of the constant current source HI serves as the second output terminal of the constant current source for generating a current of a specific magnitude and frequency. The gate of the switching transistor is connected to the switching signal interface of the core control unit 110, and the drain of the switching transistor is used as the first output end of the constant current source, wherein the switching transistor is turned on or off according to the pulse control signal received by the gate, so that the switching transistor generates the special frequency current.
The core control unit 110 is used for synchronously outputting the measurement switch control signals. The N-group battery impedance measurement switches 100 are configured to switch on each of the N-group battery impedance measurement switches K1, K2, …, KN in a time-sharing manner based on a measurement switch control signal, so as to apply a specific frequency current of a specific magnitude to each of the unit batteries in a time-sharing manner, where the N-group battery impedance measurement switches are in one-to-one correspondence with the N unit batteries, and each group battery impedance measurement switch includes a positive-side battery impedance measurement switch and a negative-side battery impedance measurement switch. The core control unit 110 is configured to collect voltage signals at two ends of corresponding unit cells, and calculate impedance of each unit cell according to the voltage signals and the specific frequency current with a specific amplitude. For example, the first group battery impedance measurement switch K1 corresponds to the unit battery 1; the second group of battery impedance measuring switches K2 corresponds to the single batteries 2; … the nth group of cell impedance measuring switches KN corresponds to the unit cells N.
Referring to fig. 2, the core control unit 110 is configured to compare and pair the impedances of N unit cells in the battery pack, and use two unit cells with the same or similar impedances as one unit cell pair and store the position information of the paired unit cells, so as to divide the N unit cells into N/2 unit cell pairs; generating high-frequency oscillation waveform signals with amplitude values and frequencies corresponding to different impedance values according to different impedance values of N/2 single battery pairs, and storing the high-frequency oscillation waveform signals in a register; the stored high-frequency oscillation waveform signal information corresponding to the first unit cell pair to the N/2 unit cell pair is output to the synchronous control power amplification unit 120 in a time-sharing manner through the PWM control as N/2 high-frequency oscillation waveform signals and is output to the synchronous control power amplification unit 120 in a time-sharing manner through the PWM output interface. Specifically, the core control unit 110 is configured to output a first selection switch control signal when repairing the same single cell pair in the battery pack for the first time, and control a first switch pair in the first group of switch pairs K1-1, K2-1, … and KN-1 and a second switch pair in the second group of switch pairs K1-2, K2-2, … and KN-2 to be turned on, so that an output end of the first isolation power amplifier module PA1 is connected to a first single cell in the same single cell pair, and an output end of the second isolation power amplifier module PA2 is connected to a second single cell in the same single cell pair; and when the same single battery pair in the storage battery pack is repaired for the next time, outputting a second selection switch control signal to control the second switch pair in the first group of switch pairs K1-1, K2-1, … and KN-1 and the first switch pair in the second group of switch pairs K1-2, K2-2, … and KN-2 to be connected, so that the output end of the first isolation power amplifier module PA1 is connected to the second single battery in the same single battery pair, and the output end of the second isolation power amplifier module PA2 is connected to the first single battery in the same single battery pair.
The synchronous control power amplifier unit 120 is configured to time-divisionally convert the N/2 high-frequency oscillation waveform signals into two high-frequency oscillation waveforms with opposite waveform directions and equal amplitudes, and to time-divisionally switch on the control switches of the corresponding first to N/2 th cell pairs, so that the two high-frequency oscillation waveforms with opposite waveform directions and equal amplitudes, which are respectively corresponding to the first to N/2 th cell pairs, are time-divisionally applied to the first to N/2 th cell pairs to repair the N/2 th cell. And (3) circularly repairing the N/2 single battery pairs until the impedance values of the N single batteries are consistent. In addition, after a certain repair period, after the impedance values of all the single batteries in the storage battery pack are consistent, the low-amplitude composite pulse harmonic voltage is continuously applied to all the single batteries in a time-sharing mode, the occurrence of lead sulfate recrystallization of all the single batteries is avoided, and the performance consistency of all the single batteries in the storage battery pack is ensured.
The synchronous control power amplifier unit 120 includes: the power amplifier comprises an inverting circuit, a first isolation power amplifier module PA1, a forward follower circuit and a second isolation power amplifier module PA2. The inverting circuit is used for inverting the high-frequency oscillation waveform signal to generate the high-frequency oscillation waveform signal with equal amplitude and opposite phase. The first isolation power amplifier module PA1 is configured to perform isolation amplification on a high-frequency oscillation waveform signal with equal phase-to-phase opposite amplitude, so as to generate a first high-frequency oscillation waveform signal. The forward follower circuit is used for following the high-frequency oscillation waveform signals to generate the high-frequency oscillation waveform signals with the same phase and the same amplitude. The second isolation power amplifier module PA2 is configured to perform isolation amplification on the high-frequency oscillation waveform signals with the same phase and the same amplitude, so as to generate a second high-frequency oscillation waveform signal.
The forward following circuit comprises a first operational amplifier U12B and a first resistor R1, wherein the inverting input end of the first operational amplifier is connected to the output end of the first operational amplifier U12B; the non-inverting input of the first operational amplifier U12B is connected to the PWM output interface of the core processing unit 110 via a first resistor R1. The inverting circuit includes a second operational amplifier U12A, a second resistor R2, and a third resistor R3, wherein a non-inverting input terminal of the second operational amplifier U12A is grounded, an inverting input terminal of the second operational amplifier U12A is connected to the PWM output interface of the core processing unit 110 via the second resistor R2, and an output terminal of the second operational amplifier U12A is connected to an inverting input terminal of the second operational amplifier U12A via the third resistor R3.
Hereinafter, a method and apparatus for suppressing on-line repair ripple of a battery pack according to an embodiment of the present invention will be described in detail by way of specific examples with reference to fig. 1 to 5.
Referring to fig. 5, the method for suppressing the on-line repair ripple of the battery pack includes the steps of:
in step 502, the core control unit 110 activates the battery impedance measuring unit 100 to measure the battery impedance of each unit cell in the entire group of cells. First, the core control unit 110 outputs a control pulse to start the output of the constant current source signal, synchronously outputs the switch control signal, outputs the constant current signal to each single battery, and simultaneously starts the analog acquisition function to acquire the voltage signals at two ends of the corresponding battery, and calculates the impedance of each single battery.
In step S504, the core control unit 110 performs comparison and pairing according to the impedance of each unit cell in the whole set of the unit cells measured in step S1, and uses two unit cells with similar impedance as a pair and stores pairing information, so that the whole set of N unit cells can be divided into N/2 pairs of cells.
In step 506, the core control unit 110 outputs the high-frequency oscillation waveform signal required for repairing the battery through the PWM output interface, and the high-frequency oscillation waveform signal is amplified and output into two high-frequency oscillation waveforms with opposite waveform directions after being isolated by the synchronous control power amplification unit. Synchronously, a control switch of a pair of single batteries matched according to the step S2 is started, the pair of batteries are respectively connected to the two high-frequency oscillation waveforms, the pair of batteries are synchronously repaired, and as the two waveform signals are opposite, the output effect of the whole battery is counteracted, the signal intensity is counteracted, and the output ripple of the whole battery is close to zero.
In step 508, step S3 is repeated to perform cyclic repair on the other paired batteries of the entire battery.
The storage battery online repairing ripple suppression device solves the problem that ripple generated during online repairing of the existing storage battery interferes with running equipment and environmental ripple, and fundamentally solves the use safety of the storage battery online maintenance equipment.
The on-line repairing ripple suppression device for the storage battery pack comprises a battery impedance test unit 100, a core control unit 110, a synchronous control power amplification unit 120 and a whole group of battery units 130. Firstly, impedance measurement is carried out on different batteries in the whole group of batteries through a battery impedance measurement unit 100, batteries with similar impedance are screened out and grouped and paired, two batteries with the same or similar impedance are repaired as a pair, a high-frequency oscillation waveform signal generated by a core control unit 110 is applied to a high-frequency oscillation waveform synchronous control power amplification unit 120, the paired batteries are synchronously applied with high-frequency oscillation waveforms to repair, and the synchronous control power amplification unit 120 ensures that pulse waveforms with equal amplitude and opposite phases are simultaneously output to the pair of batteries, so that the circuit design effect that the integrally generated ripple is close to zero ripple output is achieved. The core control unit 110 controls the application of the high-frequency oscillation waveform to all the cells of the matched whole group of cells in a time-sharing manner to repair until the whole repair effect is completed.
The beneficial effects of the technical scheme are as follows: the battery impedance testing unit 100, the synchronous control power amplification unit 120 and the positive and negative electrodes of all the single batteries in the whole battery are connected by adopting controllable electronic or mechanical switches, the battery impedance measuring function and the synchronous control power amplification output function are all time-sharing control inputs, and are completely disconnected from all the single batteries when not put into use, and no electrical connection exists.
The battery impedance testing unit 100 is used for reducing the interference of pulse signals to the environment and connected battery-powered equipment when impedance is measured, the connection line between the battery impedance testing unit 100 and the anode and the cathode of the battery is a twisted pair with a shielding layer grounded, and the applied alternating current signal is a constant current signal with the amplitude of 1.2A and the frequency of 110 Hz.
The battery impedance measuring unit 100 generates a measuring signal through dual switch control, the constant current source switch KZ is turned on by the control pulse sent by the core control unit 110, the pulse current of the constant current source is output, and the battery impedance measuring switches K1-KN are responsible for applying the pulse current signals to the batteries 1-N in a time sharing manner; synchronously, the core control unit 110 initiates analog signal acquisition at the same time when a pulse current is applied across the battery. The constant current source switch pulse, the battery impedance measurement switch control signal and the analog acquisition action controlled by the core control unit 110 are started at the same time, so that the synchronism of the signals is ensured. Further, when the impedance of one battery is measured, other batteries in the whole battery are in a disconnection state, so that the constant current signals of all the single batteries are disconnected when applied, and signal shunting or signal crosstalk cannot be generated.
Referring to fig. 1, the battery pack on-line repair ripple suppression device includes a battery impedance test unit 100, a core control unit 110, a synchronous control power amplification unit 120, and an entire group of battery cells 130. Firstly, impedance measurement is performed on different batteries in the whole group of battery units 130 through the battery impedance measurement unit 100, batteries with similar impedance are screened out and grouped and paired, two batteries with the same or similar impedance are repaired as a pair, a high-frequency oscillation waveform signal generated by the core control unit 110 is applied to the high-frequency oscillation waveform synchronous control power amplification unit 120, the paired batteries are synchronously applied with high-frequency oscillation waveforms for repairing, and the synchronous control power amplification unit 120 ensures that pulse waveforms with equal amplitude and opposite phases are simultaneously output to the pair of batteries, so that the circuit design effect that the integrally generated ripple is close to zero ripple output is achieved. The core control unit 110 controls the application of the high-frequency oscillation waveform to all the cells of the matched whole group of cells in a time-sharing manner to repair until the whole repair effect is completed.
The beneficial effects of the technical scheme are as follows: the battery impedance testing unit 100, the synchronous control power amplification unit 120 and the positive and negative electrodes of each single battery of the unit 130 in the whole battery are connected by adopting controllable electronic or mechanical switches, the battery impedance measuring function and the synchronous control power amplification output function are all time-sharing control inputs, and are completely disconnected from each single battery when not put into use, and no electrical connection exists.
Referring to fig. 2, to reduce interference of the pulse signal to the environment and the connected battery-powered device when measuring impedance, the connection line of the battery impedance test unit 100 to the positive and negative electrodes of the battery is a twisted pair line with a shielding layer grounded, and the applied ac signal is a constant current signal with amplitude of 1.2A and frequency of 110 Hz. The core control unit 110 controls the constant current source switch KZ and the battery impedance measuring switches K1-KN through the switch signal interface A, and the core control unit 110 is connected to output signals of the constant current source through an analog quantity acquisition interface through a shielded twisted pair.
Referring to fig. 2, a battery impedance measuring unit 100 generates a measurement signal by double switching control, a constant current source switch KZ is turned on after a control pulse is sent by a core control unit 110, a pulse current of the constant current source is output, and battery impedance measuring switches K1 to KN perform selective turn-on of batteries 1 to N; applying the pulse current signal to the battery 1-the battery N in a time-sharing manner; synchronously, the core control unit 110 initiates analog signal acquisition at the same time when a pulse current is applied across the battery. The constant current source switch pulse, the battery impedance measurement switch control signal and the analog acquisition action controlled by the core control unit 110 are started at the same time, so that the synchronism of the signals is ensured. Further, when the impedance of one battery is measured, other batteries in the whole battery are in a disconnection state, so that the constant current signals of all the single batteries are disconnected when applied, and signal shunting or signal crosstalk cannot be generated.
After the impedance measurement of each unit cell in the whole set of battery units 130 is completed, the core control unit 110 performs software comparison analysis on the impedance of each unit cell, uses two cells with the closest two impedances as a pair, and stores the position information of the related cells, so that the whole set of battery consisting of N cells can be divided into N/2 cell pairs, and generates high-frequency oscillation waveform signals with amplitudes and frequencies corresponding to the different impedance values according to the different impedance values of the N/2 cell pairs and stores the signals in the register.
Referring to fig. 4, the core control unit 110 is connected to a PWM signal input terminal of the synchronous control power amplification unit 120 through a PWM output interface; the core control unit 110 is connected to the pulse waveform signal selection switches K1-1, K1-2, K2-1, K2-2 through the switch signal interface B, and controls whether the switches are turned on; one end of each pulse waveform signal selection switch K1-1 and one end of each pulse waveform signal selection switch K1-2 are connected in parallel to the positive electrode and the negative electrode of the battery 1 in the whole group of battery units 130, the other end of each pulse waveform signal selection switch K1-1 is connected to the signal output of the isolation power amplifier module PA1, and the other end of each pulse waveform signal selection switch K1-2 is connected to the signal output of the isolation power amplifier module PA 2; further, K2-1, K2-2.
Referring to fig. 3, the waveform amplitude and frequency of the applied high-frequency oscillation are different depending on the impedance of the paired battery pack, and these information are stored in the memory of the core control unit 110 according to the measurement result of each battery impedance. The core control unit 110 outputs the corresponding amplitude and frequency high-frequency oscillation waveform to the PWM signal input terminal of the synchronous control power amplification unit 120 according to the above-mentioned stored information. The high-frequency oscillation waveform is composed of waveforms with different frequencies and amplitudes, and the low-frequency part of the waveform has large amplitude and the high-frequency part has small amplitude. Therefore, the large energy obtained by the large lead sulfate crystals and the small energy obtained by the small lead sulfate crystals can be ensured, crystals with different forms can be crushed and can participate in chemical reaction again, and the purpose of repairing is achieved.
Referring to fig. 4, a pwm signal input terminal is connected to pin 5 of the op-amp chip U12B through a resistor R1, and pins 6 and 7 of U12B are connected together to form a forward follower circuit; pin 7 of U12B is connected to the isolated power amplifier module PA2, and the pin 7 signal is completely consistent with the PWM pulse waveform signal terminal. The PWM signal input terminal is connected to a pin 2 of the operational amplifier chip U12A through a resistor R2, and pins 2 and 1 of the U12A are connected together through a resistor R3 to form a reverse circuit; pin 1 of U12A is connected to isolation power amplifier module PA, and pin 1 signal and PWM pulse waveform signal terminal opposite phase and amplitude are equal. The forward following circuit and the reverse circuit ensure that the hardware transmission delay time of signals is consistent, and the phase difference is 180 degrees; the inverting circuit adopts an amplification factor of 1.0, so that the signal amplitude is ensured to be equal.
The isolation power amplification modules PA1 and PA2 of the synchronous control power amplification unit 120 have the same selected hardware parameters, the same amplification factor and the same hardware delay circuit, and referring to fig. 4, it is ensured that the high-frequency oscillation waveforms required by battery repair output after the signals are isolated and amplified by the isolation power amplification modules PA1 and PA2 are opposite in phase and equal in amplitude.
The positive and negative electrodes of each single battery in the whole group of batteries are connected to two pairs of electronic or mechanical switches through shielded signal wires, and the other ends of the two pairs of switches are respectively connected to high-frequency oscillation waveform output loops of the isolation power amplifier modules PA1 and PA 2; when the battery is repaired, the core control unit selectively controls a pair of switches to be closed and communicated with the high-frequency oscillation waveform output loop of the PA1 or the PA2, so that the high-frequency oscillation waveform of the battery is repaired.
The core control unit 110 synchronously starts the PWM high-frequency oscillation waveform output and closes the switch connected with two unit batteries with similar impedance in the matched group of the whole group of batteries, and further, if one unit battery is connected to the PA1 high-frequency oscillation waveform output loop, the other unit battery is connected to the PA2 high-frequency oscillation waveform output loop. Because the impedance of the batteries is similar, the voltage phases are opposite, the generated current directions are opposite, and the external output ripple wave of the whole group of batteries is nearly zero.
The core control unit 110 performs the repair of N/2 pairs of the whole group of batteries in a time-sharing manner, and if the same pair of batteries are repaired for the first time, the battery 1 is connected to the PA1 high-frequency oscillation waveform output loop, and the battery 2 is connected to the PA2 high-frequency oscillation waveform output loop; then, in the next second repair, the battery 1 is connected to the PA2 high-frequency oscillation waveform output circuit, and the battery 2 is connected to the PA1 high-frequency oscillation waveform output circuit. The battery repair is cyclically and alternately performed in this way. The first waveform direction of the high-frequency oscillation waveform applied in the battery repairing process is ensured, and the positive direction pulse and the reverse direction pulse are both provided, so that the balance of the repairing effect is ensured.
After completing the repair for a period of time (for example, 24 hours is a period), the core control unit 110 restarts the measurement of the internal resistance of the battery, pairs each unit cell in the whole battery again according to the difference of the internal resistances of the repaired battery, and then repairs the unit cells as described above, so as to ensure that the ripple output effect is kept at a lower level after repairing for a period of time.
The amplitude and frequency of the PWM waveform signal applied by the core control unit 110 may be dynamically adjusted according to the difference of the internal resistances of the respective pairs of batteries.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. the on-line repairing ripple suppression device of the storage battery packs repairs the two batteries with similar impedance as a pair by carrying out impedance measurement on each battery in the whole battery pack, so that the repairing efficiency of the whole battery pack is improved, and meanwhile, the ripple effect generated on the whole battery pack by superposition is close to zero because the applied high-frequency oscillation waveforms are equal in amplitude and opposite in phase; the technical problem of ripple interference influence generated by on-line maintenance of the lead-acid storage battery is thoroughly solved.
2. The on-line repairing ripple suppression device for the storage battery pack has the advantages that due to the circuit design characteristics that the high-frequency oscillation waveforms applied during on-line maintenance are equal in amplitude and opposite in phase, the amplitude of the low-frequency pulse can be properly improved, large ripple interference can not be generated, and the technical advantage of a larger maintenance range is provided for the whole on-line maintenance technology.
3. The on-line repairing ripple suppression device of the storage battery solves the problems that the adopted hardware filtering method cannot adapt to and completely solve the generation of ripple waves and the ripple wave interference to a system and the environment due to different amplitude frequency waveform characteristics provided for large crystals and small crystals due to the circuit design characteristics that the amplitude of high-frequency oscillation waveforms applied during on-line repairing are equal and opposite in phase. The waveforms applied to a pair of cells to be repaired, regardless of the frequency and amplitude values, have the same amplitude and opposite phase waveforms applied to the cells simultaneously, and the ripple superposition effect of the entire set of cells is maintained at an extremely low level.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims (10)

1. The method for suppressing the ripple of the storage battery pack during online repair is characterized by comprising the following steps of:
measuring the impedance of N single batteries in the storage battery pack through a battery impedance measuring unit;
comparing and pairing the impedance of N single batteries in the storage battery pack, and taking two single batteries with the same or similar impedance as a single battery pair and storing the position information of paired single batteries so as to divide the N single batteries into N/2 single battery pairs;
generating high-frequency oscillation waveform signal information of amplitude and frequency corresponding to different impedance values according to different impedance values of N/2 single battery pairs by a core control unit, and storing the high-frequency oscillation waveform signal information in a register;
Outputting stored high-frequency oscillation waveform signal information corresponding to a first single battery pair into high-frequency oscillation waveform signals through PWM (pulse-width modulation) control by the core control unit, converting the high-frequency oscillation waveform signals into two high-frequency oscillation waveforms with opposite waveform directions and equal amplitude by the synchronous control power amplification unit, and synchronously switching on a control switch of the first single battery pair so as to apply the two high-frequency oscillation waveforms with opposite waveform directions to the first single battery pair; sequentially applying two high-frequency oscillation waveform signals with opposite waveform directions and equal amplitudes respectively corresponding to a second single battery pair to an N/2 th single battery pair to the second single battery pair to the N/2 th single battery pair in a time sharing manner according to the same method; and
and carrying out cyclic repair on the N/2 single battery pairs.
2. The method for suppressing ripple on-line repair of a battery pack according to claim 1, wherein measuring the impedance of N unit cells in the battery pack by the cell impedance measurement unit further comprises:
starting a constant current source based on control pulses output by a core control unit, so that the constant current source outputs special-frequency current with a specific amplitude;
Based on the switch control signals synchronously output by the core control unit, the N single batteries are in time-sharing connection so as to output the special-frequency current with the specific amplitude to each single battery;
simultaneously starting an analog quantity acquisition function of the core control unit to acquire voltage signals at two ends of the corresponding single battery; and
and calculating the impedance of each single battery according to the voltage signals at the two ends of the single battery and the specific frequency current with the specific amplitude.
3. The method of suppressing ripple on-line repair of a battery pack according to claim 1, wherein converting the high-frequency oscillation waveform signal into two high-frequency oscillation waveforms having opposite waveform directions by synchronously controlling a power amplification unit comprises:
inverting the high-frequency oscillation waveform signal through an inverting circuit of the synchronous control power amplification unit to generate a high-frequency oscillation waveform signal with opposite phases and equal amplitude and amplifying the high-frequency oscillation waveform signal into a first high-frequency oscillation waveform signal; and
the forward following circuit of the synchronous control power amplification unit is used for converting the high-frequency oscillation waveform signals into high-frequency oscillation waveform signals with the same phase and the same amplitude and amplifying the high-frequency oscillation waveform signals into second high-frequency oscillation waveform signals, so that the amplitudes of the first high-frequency oscillation waveform signals and the second high-frequency oscillation waveform signals are equal and the phases of the first high-frequency oscillation waveform signals and the second high-frequency oscillation waveform signals are opposite.
4. The method of suppressing ripple on-line repair of a battery pack according to claim 3, wherein time-divisionally applying two high-frequency oscillation waveform signals respectively opposite in waveform direction to a first cell pair to an N/2 th cell pair to the first cell pair to the N/2 th cell pair includes: when the same single cell pair in the storage battery pack is repaired for the first time, the first high-frequency oscillation waveform signal is applied to a first single cell in the same single cell pair, and the second high-frequency oscillation waveform signal is applied to a second single cell in the same single cell pair; and
and when the same single battery cell pair in the storage battery pack is subjected to the next second repair, applying the first high-frequency oscillation waveform signal to a second single battery cell in the same single battery cell pair, and applying the second high-frequency oscillation waveform signal to a first single battery cell in the same single battery cell pair.
5. The utility model provides a storage battery restores ripple suppression device on line which characterized in that includes:
the battery impedance measuring unit is used for measuring the impedance of N single batteries in the storage battery pack;
The core control unit is used for comparing and pairing the impedance of N single batteries in the storage battery pack, taking two single batteries with the same or similar impedance as a single battery pair, storing the position information of the paired single batteries, dividing the N single batteries into N/2 single battery pairs, generating high-frequency oscillation waveform signal information with amplitude and frequency corresponding to different impedance values according to different impedance values of the N/2 single battery pairs, and storing the high-frequency oscillation waveform signal information in a register; the stored high-frequency oscillation waveform signal information corresponding to the first single battery pair to the N/2 single battery pair is output into N/2 high-frequency oscillation waveform signals in a time-sharing mode through PWM control; and
the synchronous control power amplification unit is used for converting the N/2 high-frequency oscillation waveform signals into two high-frequency oscillation waveforms with opposite waveform directions in a time sharing mode, and the control switches of the corresponding first unit battery pair to the N/2 unit battery pair are synchronously switched on in a time sharing mode, so that the two high-frequency oscillation waveforms with opposite waveform directions and equal amplitudes respectively corresponding to the first unit battery pair to the N/2 unit battery pair are applied to the first unit battery pair to the N/2 unit battery pair in a time sharing mode in sequence.
6. The apparatus according to claim 5, wherein the cell impedance measuring unit comprises a constant current source and a switching transistor, wherein,
the positive electrode of the constant current source is connected to the source electrode of the switching transistor, and the negative electrode of the constant current source is used as a second output end of the constant current source and is used for generating current with specific amplitude and frequency;
and the grid electrode of the switching transistor is connected with the switching signal interface of the core control unit, and the drain electrode of the switching transistor is used as the first output end of the constant current source, wherein the switching transistor is turned on or turned off according to the pulse control signal received by the grid electrode, so that the switching transistor generates the special frequency current.
7. The on-line repair ripple suppression apparatus of a battery pack according to claim 6, further comprising N sets of cell impedance measurement switches, wherein,
the core control unit is used for synchronously outputting a measurement switch control signal;
the N groups of battery impedance measurement switches are used for switching on each battery impedance measurement switch in the N groups of battery impedance measurement switches in a time-sharing manner based on the measurement switch control signals so as to apply the specific frequency current with the specific amplitude to each single battery in a time-sharing manner, wherein the N groups of battery impedance measurement switches are in one-to-one correspondence with the N single batteries;
The core control unit is used for collecting voltage signals at two ends of corresponding single batteries and calculating the impedance of each single battery according to the voltage signals and the specific frequency current with the specific amplitude.
8. The apparatus for suppressing ripple on-line repair of a battery pack according to claim 5, wherein the synchronous control power amplification unit comprises: the device comprises an inverting circuit, a first isolation power amplifier module, a forward follower circuit and a second isolation power amplifier module, wherein,
the inverting circuit is used for inverting the high-frequency oscillation waveform signals to generate high-frequency oscillation waveform signals with opposite phases and equal amplitudes;
the first isolation power amplification module is used for carrying out isolation amplification on the high-frequency oscillation waveform signals with opposite phases and equal amplitude values so as to generate a first high-frequency oscillation waveform signal;
the forward following circuit is used for following the high-frequency oscillation waveform signals to generate high-frequency oscillation waveform signals with the same phase and the same amplitude; and
and the second isolation power amplification module is used for carrying out isolation amplification on the high-frequency oscillation waveform signals with the same phase and the same amplitude so as to generate a second high-frequency oscillation waveform signal.
9. The battery pack on-line repair ripple suppression apparatus of claim 8, wherein the forward follower circuit comprises a first operational amplifier and a first resistor, wherein an inverting input of the first operational amplifier is connected to an output of the first operational amplifier; the non-inverting input end of the first operational amplifier is connected with the PWM output interface of the core processing unit through the first resistor;
The inverting circuit comprises a second operational amplifier, a second resistor and a third resistor, wherein the non-inverting input end of the second operational amplifier is grounded, the inverting input end of the second operational amplifier is connected with the PWM output interface of the core processing unit through the second resistor, and the output end of the second operational amplifier is connected to the inverting input end of the second operational amplifier through the third resistor.
10. The battery pack on-line repair ripple suppression apparatus of claim 8, wherein the core control unit is configured to:
when the same single battery pair in the storage battery pack is repaired for the first time, a first selection switch control signal is output, and a first switch pair in a first group of switch pairs and a first switch pair in a second group of switch pairs are controlled to be connected, so that the output end of the first isolation power amplification module is connected to the first single battery in the same single battery pair, and the output end of the second isolation power amplification module is connected to the second single battery in the same single battery pair; and
and when the same single battery pair in the storage battery pack is repaired for the next time, outputting a second selection switch control signal to control a second switch pair in the first group of selection switches and a second switch pair in the second group of selection switches to be connected, so that the output end of the first isolation power amplifier module is connected to a second single battery in the same single battery pair, and the output end of the second isolation power amplifier module is connected to a first single battery in the same single battery pair.
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