CN110828917A - Storage battery online sulfur removal system and method based on variable frequency signals - Google Patents
Storage battery online sulfur removal system and method based on variable frequency signals Download PDFInfo
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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
- H01M10/4242—Regeneration of electrolyte or reactants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- 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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
- G01R31/379—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator for lead-acid batteries
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- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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
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- 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
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Abstract
The invention provides a frequency conversion signal-based storage battery online sulfur removal system and a method, wherein a test circuit is connected into a storage battery pack, the storage battery pack is divided into a first half group and a second half group by two groups of single-pole double-throw switches, internal resistances of the storage battery pack of the first group and the storage battery pack of the second group are measured, and the vulcanization degree of the storage battery is judged according to a standard internal resistance information table of the storage battery, so that a pulse signal with corresponding frequency can be selected according to the vulcanization degree, the sulfur removal effect is ensured, the situation that the sulfur cannot be removed due to too low frequency of the pulse signal and the storage battery is damaged due to too high frequency of the pulse signal can be prevented, on the other hand, the storage battery pack of the first half group and the storage battery pack of the second group can be interchanged by switching the single-pole double-throw switches to be closed towards the other moving end, the, the desulfurizing effect is ensured, and the waste of resources and the use of manpower are reduced.
Description
Technical Field
The invention relates to the technical field of storage battery desulphurization, in particular to a storage battery on-line desulphurization system and method based on a variable frequency signal.
Background
The valve-controlled lead-acid storage battery is widely applied to an electric power system and mainly used as a backup power supply of a storage battery pack, the lead-acid storage battery can generate lead sulfate substances in long-term use, the lead sulfate substances can be decomposed into lead and sulfuric acid in the charging process and participate in the electrochemical reaction of the storage battery again, the effective reaction area of the storage battery can be reduced due to the existence of the lead sulfate substances, the capacity of the storage battery is reduced, and the storage battery needs to be maintained greatly to ensure the safe and reliable operation of the electric power system.
The common sulfur removal method adopts pulse signals to remove sulfur, but the existing sulfur removal work directly applies the pulse signals to the storage battery and does not select the pulse signals with corresponding frequencies according to the vulcanization degree of the storage battery, so that the sulfur removal effect is poor, the capacity of the storage battery can be reduced, and the service life of the storage battery is prolonged
Disclosure of Invention
Therefore, the invention provides the storage battery online sulfur removal system and method based on the variable frequency signals, which can measure the internal resistance value of the storage battery online, so that the pulse signals with corresponding frequencies can be selected according to the internal resistance value of the storage battery, the labor cost of maintenance departments can be reduced, the storage battery can be accurately subjected to sulfur removal, the vulcanization speed of the storage battery is slowed down, and the service life of the storage battery is prolonged.
The technical scheme of the invention is realized as follows:
a storage battery online sulfur removal system based on variable frequency signals comprises a direct current system, a test circuit, an internal resistance detection module, a vulcanization degree judgment module and a pulse signal generator, wherein the direct current system comprises a storage battery pack, a load resistor and a charger which are connected in parallel, the storage battery pack is electrically connected with the test circuit, the internal resistance detection module and the pulse signal generator respectively, the internal resistance detection module is in signal connection with the test circuit and the vulcanization degree judgment module respectively, and the vulcanization degree judgment module is in signal connection with the pulse signal generator; the testing circuit comprises a signal source, a first single-pole double-throw switch and a second single-pole double-throw switch, wherein the positive pole of the signal source is electrically connected to the immovable end of the first single-pole double-throw switch, the negative pole of the signal source is electrically connected to the immovable end of the second single-pole double-throw switch, the two movable ends of the first single-pole double-throw switch are respectively and electrically connected to the negative end and the middle lead of the storage battery pack, and the two movable ends of the second single-pole double-throw switch are respectively and electrically connected to the positive end and the middle lead of the storage battery pack.
Preferably, the internal resistance detection module comprises a characteristic signal attenuation detection module and a current detection module, the current detection module is respectively in signal connection with the test circuit, the characteristic signal attenuation detection module and the vulcanization degree judgment module, and the characteristic signal attenuation detection module is respectively in signal connection with the storage battery pack and the vulcanization degree judgment module.
Preferably, the test circuit further comprises a coupling capacitor electrically connected between the negative terminal of the signal source and the stationary terminal of the second single-pole double-throw switch.
Preferably, the vulcanization degree judgment module is internally provided with a storage battery standard internal resistance information table.
A storage battery online sulfur removal method based on variable frequency signals comprises the following steps:
s1, controlling the first single-pole double-throw switch and the second single-pole double-throw switch to close towards the same side, so that the storage battery pack is electrically connected with the signal source and is divided into a first half group and a second half group;
step (ii) ofS2, detecting the characteristic signal attenuation voltage V of each storage battery in the first half group of storage battery pack by the internal resistance detection moduleiAnd the characteristic signal attenuation voltage V of each storage battery in the second half group of storage battery packjThe first half group of injection current signals I1And the first half group of injection current signals I2N, wherein i is 1.. n/2, j is n/2+1.. n, and n is the number of storage batteries;
step S3, attenuating voltage V according to characteristic signals of the first half group of storage battery packsiCharacteristic signal attenuation voltage V of the second half group of storage battery packjThe first half group of injection current signals I1And a second half group injection current signal I2Calculating internal resistance rn of the first half group of storage battery pack1And internal resistance rn of the second half group of storage battery pack2；
Step S4, if I1/I2If the voltage is more than 1.5, controlling the first single-pole double-throw switch and the second single-pole double-throw switch to be closed towards the other side, exchanging the front half group of storage battery pack with the rear half group of storage battery pack, and returning to the step S2; if I1/I2< 1.5, go to step S5;
step S5, according to internal resistance rn of the first half group of storage battery packs1And internal resistance rn of the second half group of storage battery pack2Judging the vulcanization degree of the storage battery pack;
and step S6, selecting the desulphurization pulse signals with different frequencies according to the degree of vulcanization, and carrying out desulphurization on the storage battery pack.
Preferably, the specific step of step S2 is:
step S21, the internal resistance detection module directly detects the characteristic signal attenuation voltage V of each storage battery in the first half group of storage battery packsiAnd the characteristic signal attenuation voltage V of each storage battery in the second half group of storage battery packj；
Step S22, obtaining characteristic signal attenuation voltage V of middle storage battery of the first half group of storage battery packs0.25nCharacteristic signal attenuation voltage V of middle storage battery of second half group storage battery pack0.75n；
Step S23, acquiring the total input current I of the signal source;
step S24, according to V0.25n/V0.75n＝I1/I2And I ═ I1+I2Calculated to obtain I1And I2The size of (2).
Preferably, the internal resistance rn of the first half group of storage battery packs1The expression of (a) is:
internal resistance rn of the second half group of storage battery pack2The expression of (a) is:
preferably, in step S4, when I is1/I2If the ratio is more than 1.5, the front half group and the rear half group of the storage battery pack are exchanged, the step S2 is returned, and if the calculated I is larger than the ratio1/I2If the ratio of the internal resistance of the first half group of storage battery pack to the internal resistance of the second half group of storage battery pack is still larger than 1.5, the internal resistances of the first half group of storage battery pack and the second half group of storage battery pack obtained twice are averaged, and the process proceeds to step S5.
Preferably, the specific step of step S5 is: and acquiring the vulcanization degree of the storage battery according to the standard internal resistance information table of the storage battery.
Preferably, the method further comprises the following steps:
and step S7, standing for a period of time after the sulfur removal is finished, retesting the internal resistance, judging the vulcanization effect, and if the vulcanization effect is poor, readjusting the frequency of the pulse signal to further remove the sulfur from the storage battery.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a storage battery on-line sulfur removal system and method based on variable frequency signals, wherein a test circuit is externally connected to a storage battery pack, the storage battery pack is divided into a first half group and a second half group by two groups of single-pole double-throw switches through the test circuit, so that the internal resistances of the first half group storage battery pack and the second half group storage battery pack can be measured, the vulcanization degree of the storage battery pack is judged through the internal resistance obtained through measurement, pulse signals with different frequencies can be selected according to the vulcanization degree, the sulfur removal effect can be ensured, unnecessary resource waste is reduced, and meanwhile, in order to ensure the accuracy of internal resistance measurement, the obtained first half group storage battery pack is subjected to sulfurGroup current I1And a second half group current I2When the ratio of the voltage to the current of the storage battery pack is larger than 1.5, the internal resistances of the storage battery pack of the first half group and the storage battery pack of the second half group are measured again after the first half group and the second half group are exchanged by changing the states of the two groups of single-pole double-throw switches, so that the measurement accuracy of the internal resistances can be ensured, the frequency of pulse signals can be selected quickly, the sulfur removal efficiency of the storage battery pack is improved, and the service life of the storage battery pack can be prevented from being damaged due to overhigh frequency of.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of an embodiment of an on-line battery sulfur removal system based on variable frequency signals according to the present invention;
FIG. 2 is a circuit diagram of a battery pack and a test circuit of an embodiment of the on-line battery sulfur removal system based on variable frequency signals according to the present invention;
FIG. 3 is a circuit diagram of a characteristic signal attenuation detection module of an embodiment of the on-line battery sulfur removal system based on variable frequency signals according to the present invention;
FIG. 4 is a flow chart of an embodiment of the method for on-line battery sulfur removal based on variable frequency signals according to the present invention;
in the figure, 1 is a storage battery pack, 2 is a test circuit, 3 is an internal resistance detection module, 4 is a vulcanization degree judgment module, 5 is a pulse signal generator, 6 is a characteristic signal attenuation detection module, and 7 is a current detection module.
Detailed Description
For a better understanding of the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described with reference to the accompanying drawings.
Referring to fig. 1 to 3, the storage battery online sulfur removal system based on a frequency conversion signal provided by the invention comprises a direct current system, a test circuit 2, an internal resistance detection module 3, a vulcanization degree judgment module 4 and a pulse signal generator 5, wherein the direct current system comprises a storage battery pack 1, a load resistor and a charger which are connected in parallel, the storage battery pack 1 is respectively and electrically connected with the test circuit 2, the internal resistance detection module 3 and the pulse signal generator 5, the internal resistance detection module 3 is respectively and electrically connected with the test circuit 2 and the vulcanization degree judgment module 4, and the vulcanization degree judgment module 4 is in signal connection with the pulse signal generator 5; the test circuit 2 comprises a signal source, a first single-pole double-throw switch and a second single-pole double-throw switch, wherein the positive pole of the signal source is electrically connected to the immovable end of the first single-pole double-throw switch, the negative pole of the signal source is electrically connected to the immovable end of the second single-pole double-throw switch, the two movable ends of the first single-pole double-throw switch are respectively electrically connected to the negative pole end and the middle lead of the storage battery pack 1, and the two movable ends of the second single-pole double-throw switch are respectively electrically connected to the positive pole end and the middle lead of the storage battery pack 1.
In this embodiment, the internal resistance detection module 3 may detect the internal resistance of the storage battery pack 1 on line, so that the vulcanization degree determination module 4 may determine the vulcanization degree of the current storage battery according to the internal resistance, and finally the pulse signal generator 5 may select the pulse signal with the corresponding frequency according to the vulcanization degree, so that the pulse signal may remove sulfur from the storage battery most effectively, and prevent the selected pulse signal from being too low in frequency to achieve an expected sulfur removal effect or too high in frequency from damaging the storage battery pack 1 and reducing the service life of the storage battery pack 1.
As shown in fig. 2, R is a load, X is a charger, Vs is a signal source, K1 and K2 are a first single-pole double-throw switch and a second single-pole double-throw switch, respectively, and B is a switch1...BnIn this embodiment, the test line 2 is set to a half-group access structure, and is connected to the battery pack 1 through a first single-pole double-throw switch and a second single-pole double-throw switch, respectively, the moving end a of the first single-pole double-throw switch is electrically connected to the moving end B of the second single-pole double-throw switch and then is accessed to the middle of the battery pack 1 through a wire, wherein when the stationary end of the first single-pole double-throw switch is connected to the stationary end thereofWhen the movable end B is connected and the immovable end of the second single-pole double-throw switch is connected with the movable end B, the storage battery pack 1 is divided into a first half group and a second half group, the injection current flow direction of a signal source is shown as figure 2, wherein I is the total injection current signal of the signal source, and I is the total injection current signal of the signal source1Is the injection current signal of the first half group, I2The voltage value of each storage battery can be detected through the internal resistance detection module 3 at the moment, so that the internal resistance value of each storage battery can be obtained according to the voltage value and the injected current signal, finally, the internal resistance values of all the storage batteries are accumulated to obtain the internal resistance value of the storage battery pack 1, and the vulcanization state can be judged according to the internal resistance value.
In order to further ensure the measurement accuracy of the internal resistance of the storage battery, the immobile ends of the first single-pole double-throw switch and the second single-pole double-throw switch can be electrically connected with the mobile end A thereof, so that the front half group and the rear half group of the storage battery are exchanged, after the internal resistances of the front half group of storage battery and the rear half group of storage battery are calculated again, the internal resistances can be compared with the internal resistance obtained by the previous calculation, and a more accurate measurement value or an average value is selected, so that the measurement accuracy of the internal resistance of the storage battery can be ensured, and pulse signals with corresponding frequencies can be selected according to the internal resistance value to carry out sulfur removal.
The internal resistance of the storage battery pack 1 is measured through the storage battery pack of the front half group and the rear half group, so that the vulcanization state can be judged according to the internal resistance value of the storage battery pack 1, pulse signals with corresponding frequencies are selected to remove sulfur, when the internal resistance value is not accurately measured, the storage battery pack of the front half group and the storage battery pack of the rear half group can be exchanged through the test circuit 2, the internal resistance values of the storage battery pack of the front half group and the storage battery pack of the rear half group are measured again, the precision of internal resistance measurement can be improved, the vulcanization degree of the storage battery can be accurately judged, pulse signals with correct frequencies can be selected, the effect of sulfur removal is ensured, the problem that sulfur removal cannot be realized through too small pulse signal frequencies is prevented, the storage battery is prevented from.
Preferably, the internal resistance detection module 3 includes a characteristic signal attenuation detection module 6 and a current detection module 7, the current detection module 7 is in signal connection with the test line 2, the characteristic signal attenuation detection module 6 and the vulcanization degree judgment module 4, respectively, and the characteristic signal attenuation detection module 6 is in signal connection with the storage battery pack 1 and the vulcanization degree judgment module 4, respectively.
As shown in the circuit diagram of the characteristic signal attenuation detection module 6 shown in fig. 3, each storage battery is provided with an individual characteristic signal attenuation detection module 6, so that the direct measurement of the characteristic signal attenuation voltage of the storage battery can be realized, the input of the current detection module 7 is the output of the characteristic signal attenuation detection module 6 and the total injection current signal I output by the signal source, and the characteristic signal attenuation voltage and the total injection current signal I of the middle storage battery of the first half group of storage battery pack and the second half group of storage battery pack are selected to calculate the first half group injection current signal I1And a second half group injection current signal I2So as to attenuate the voltage and I according to the characteristic signal of each battery1And I2The internal resistance value of each storage battery can be calculated, and the total internal resistance of the storage battery pack 1 can be obtained by accumulating the internal resistance values of the storage batteries.
Preferably, the test circuit 2 further includes a coupling capacitor electrically connected between the negative terminal of the signal source and the stationary terminal of the second single-pole double-throw switch.
The setting of the coupling capacitor is used for ensuring personal safety in the test process.
Preferably, the vulcanization degree judgment module 4 is internally provided with a storage battery standard internal resistance information table.
In an available range, the larger the internal resistance of the storage battery is, the more serious the vulcanization degree is, at this time, a pulse signal with higher frequency needs to be selected, and the vulcanization degree of the storage battery pack 1 can be directly obtained through a built-in storage battery standard internal resistance information table, so that a corresponding pulse signal can be selected according to the vulcanization degree.
Referring to fig. 4, the method for online removing sulfur from a storage battery based on a variable frequency signal comprises the following steps:
step S1, controlling the first single-pole double-throw switch and the second single-pole double-throw switch to close towards the same side, so that the storage battery pack 1 is electrically connected with a signal source, and the storage battery pack 1 is divided into a first half group and a second half group;
step S2, the internal resistance detection module 3 detects the characteristic signal attenuation voltage V of each storage battery in the first half group of storage battery packsiAnd the characteristic signal attenuation voltage V of each storage battery in the second half group of storage battery packjThe first half group of injection current signals I1And the first half group of injection current signals I2N, wherein i is 1.. n/2, j is n/2+1.. n, and n is the number of storage batteries;
step S3, attenuating voltage V according to characteristic signals of the first half group of storage battery packsiCharacteristic signal attenuation voltage V of the second half group of storage battery packjThe first half group of injection current signals I1And a second half group injection current signal I2Calculating internal resistance rn of the first half group of storage battery pack1And internal resistance rn of the second half group of storage battery pack2；
Step S4, if I1/I2If the voltage is more than 1.5, controlling the first single-pole double-throw switch and the second single-pole double-throw switch to be closed towards the other side, exchanging the front half group of storage battery pack with the rear half group of storage battery pack, and returning to the step S2; if I1/I2< 1.5, go to step S5;
step S5, according to internal resistance rn of the first half group of storage battery packs1And internal resistance rn of the second half group of storage battery pack2Judging the vulcanization degree of the storage battery pack 1;
and step S6, selecting the sulfur removal pulse signals with different frequencies according to the vulcanization degree, and removing sulfur from the storage battery pack 1.
In this embodiment, the storage battery pack 1 is divided into a first half group and a second half group by the first single-pole double-throw switch and the second single-pole double-throw switch, then the internal resistance of the storage battery pack in the first half group and the internal resistance of the storage battery pack in the second half group are measured, and the internal resistance values of the storage battery packs in the first half group and the second half group are added to obtain the internal resistance value of the storage battery pack 1, so that the vulcanization degree of the storage battery pack 1 can be judged according to the internal resistance value of the storage battery pack 1, and finally, a pulse signal with a corresponding frequency can be.
In order to ensure the measurement precision of the internal resistance of the storage battery, the first half group of the obtained injection current signals I1And a second half group injection current signal I2When the ratio of (A) to (B) is greater than 1.5, it indicates that the second half injection current signal I is2And at the moment, the moving contacts of the two single-pole double-throw switches are switched to the other end (namely, the moving contacts are switched to the A moving end for connection), so that the first half group and the second half group are exchanged, and the internal resistance values of the storage battery packs 1 of the first half group and the second half group are newly measured, so that the internal resistance measurement precision can be improved.
Preferably, the specific step of step S2 is:
step S21, the internal resistance detection module 3 directly detects the characteristic signal attenuation voltage V of each storage battery in the first half group of storage battery packsiAnd the characteristic signal attenuation voltage V of each storage battery in the second half group of storage battery packj；
Step S22, obtaining characteristic signal attenuation voltage V of middle storage battery of the first half group of storage battery packs0.25nCharacteristic signal attenuation voltage V of middle storage battery of second half group storage battery pack0.75n；
Step S23, acquiring the total input current I of the signal source;
step S24, according to V0.25n/V0.75n＝I1/I2And I ═ I1+I2Calculated to obtain I1And I2The size of (2).
The characteristic signal attenuation voltage of each storage battery can be directly detected by a characteristic signal attenuation detection module 6 arranged on the storage battery pack 1, and the first half group of injection current signals I1And a second half group injection current signal I2The calculation is needed to obtain the internal resistance r of the middle storage battery of the first half group of storage battery pack, and the internal resistance r of the middle storage battery of the first half group of storage battery pack can be deduced because the batch, the model, the manufacturer and the like of each storage battery in the storage battery pack 1 are the same, so the consistency of the storage batteries is higher, and the internal resistance is closer to each other, after the storage battery pack 1 is divided into the first half group and the second half group, and most of the internal resistances of the storage batteries0.25nInternal resistance r of middle accumulator with the second half group accumulator battery0.75nThe first half group of characteristics are obtained by monitoring the characteristic signal number attenuation detection moduleSignal attenuation voltage V0.25nAnd a characteristic signal attenuation voltage V of the intermediate accumulator of the second half group0.75nFrom I1＝V0.25n/r0.25n；I2＝V0.75n/r0.75nDue to r0.25n＝r0.75nThereby obtaining V0.25n/V0.75n＝I1/I2And the total injection current signal I ═ I of the test line 21+I2At V, in summary of above0.25n、V0.75nAnd on the premise that I is known, I can be calculated1And I2The size of (2).
Preferably, the internal resistance rn of the first half group of storage battery packs1The expression of (a) is:
internal resistance rn of the second half group of storage battery pack2The expression of (a) is:
before obtaining the first half group injection current signal I1And a second half group injection current signal I2Then, because the storage batteries are connected in series, current signals flowing through the same half group of storage batteries are equal, the internal resistance of each storage battery can be calculated by collecting characteristic signal attenuation voltage of each storage battery, the internal resistances of the same half group of storage batteries are accumulated to obtain the internal resistance of the first half group of storage battery or the internal resistance of the second half group of storage battery, and the internal resistance of the first half group of storage battery and the internal resistance of the second half group of storage battery are added to obtain the internal resistance of the whole storage battery 1.
Preferably, in step S4, when I is1/I2If it is more than 1.5, the first half group of the battery pack 1 and the second half group of the battery pack 1 are exchanged, and after the step S2 is returned, if the calculated I is larger than the predetermined value1/I2If the ratio of the internal resistance of the first half group of storage battery pack to the internal resistance of the second half group of storage battery pack is still larger than 1.5, the internal resistances of the first half group of storage battery pack and the second half group of storage battery pack obtained twice are averaged, and the process proceeds to step S5.
When the second half group is injected with a current signal I2When the internal resistance of the storage battery pack is small, the internal resistance measurement error of the storage battery pack in the second half group is increased, the precision of resistance measurement can be improved by exchanging the front half group and the rear half group, and if the front half group and the rear half group are exchanged, I1/I2The ratio of (2) is still larger than 1.5, and at this time, the internal resistance values measured twice can be averaged for calculation, so that the error generated during internal resistance measurement is reduced.
Preferably, the specific step of step S5 is: and acquiring the vulcanization degree of the storage battery according to the standard internal resistance information table of the storage battery.
Under the normal available condition of the storage battery, the internal resistance of the storage battery is in direct proportion to the vulcanization degree, the larger the internal resistance is, the more serious the vulcanization degree is, the higher the frequency of a pulse signal to be provided is, the battery used by the transformer substation at present is a 2V battery, the capacity is more in the range of 300Ah-800Ah, the internal resistance range is between 0.2m omega and 0.7m omega, according to a standard internal resistance information table of the storage battery, when the measured internal resistance of the storage battery pack 1 is less than 50 percent of the standard value, the battery has a short circuit trend, and an alarm is sent; when the measured internal resistance of the storage battery pack 1 is greater than the standard value of 50%, the local vulcanization of the battery is indicated, and the vulcanization is more serious when the internal resistance is larger, as shown in table 1, the storage battery pack is a standard internal resistance information table:
table 1: standard internal resistance information table for accumulator
The vulcanization degree of the current storage battery pack 1 can be judged through the storage battery standard resistance information table in the table 1, so that pulse signals with corresponding frequencies can be selected for desulfurization.
Preferably, the method further comprises the following steps:
and step S7, standing for a period of time after the sulfur removal is finished, retesting the internal resistance, judging the vulcanization effect, and if the vulcanization effect is poor, readjusting the frequency of the pulse signal to further remove the sulfur from the storage battery.
The whole sulfur removal process lasts for 1 hour, the reactor is kept still for 10 minutes after the sulfur removal is finished, the internal resistance is tested again, the sulfur removal effect is judged according to the internal resistance, and if the sulfur removal effect is not good, the frequency of the pulse signal can be changed for further sulfur removal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A storage battery online sulfur removal system based on variable frequency signals is characterized by comprising a direct current system, a test circuit, an internal resistance detection module, a vulcanization degree judgment module and a pulse signal generator, wherein the direct current system comprises a storage battery pack, a load resistor and a charger which are connected in parallel, the storage battery pack is electrically connected with the test circuit, the internal resistance detection module and the pulse signal generator respectively, the internal resistance detection module is in signal connection with the test circuit and the vulcanization degree judgment module respectively, and the vulcanization degree judgment module is in signal connection with the pulse signal generator; the testing circuit comprises a signal source, a first single-pole double-throw switch and a second single-pole double-throw switch, wherein the positive pole of the signal source is electrically connected to the immovable end of the first single-pole double-throw switch, the negative pole of the signal source is electrically connected to the immovable end of the second single-pole double-throw switch, the two movable ends of the first single-pole double-throw switch are respectively and electrically connected to the negative end and the middle lead of the storage battery pack, and the two movable ends of the second single-pole double-throw switch are respectively and electrically connected to the positive end and the middle lead of the storage battery pack.
2. The system of claim 1, wherein the internal resistance detection module comprises a characteristic signal attenuation detection module and a current detection module, the current detection module is respectively in signal connection with the test line, the characteristic signal attenuation detection module and the vulcanization degree judgment module, and the characteristic signal attenuation detection module is respectively in signal connection with the storage battery pack and the vulcanization degree judgment module.
3. The system of claim 1, wherein the test circuit further comprises a coupling capacitor electrically connected between the negative terminal of the signal source and the stationary terminal of the second SPDT switch.
4. The system of claim 1, wherein the vulcanization degree judgment module is internally provided with a standard internal resistance information table of the storage battery.
5. A method for the on-line sulfur removal of a storage battery based on a variable frequency signal by applying the system for the on-line sulfur removal of the storage battery based on the variable frequency signal as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
s1, controlling the first single-pole double-throw switch and the second single-pole double-throw switch to close towards the same side, so that the storage battery pack is electrically connected with the signal source and is divided into a first half group and a second half group;
step S2, the internal resistance detection module detects the characteristic signal attenuation voltage V of each storage battery in the first half group of storage battery packsiAnd the characteristic signal attenuation voltage V of each storage battery in the second half group of storage battery packjThe first half group of injection current signals I1And the first half group of injection current signals I2Wherein i is 1 … n/2, j is n/2+1 … n, and n is the number of the storage batteries;
step S3, attenuating voltage V according to characteristic signals of the first half group of storage battery packsiCharacteristic signal attenuation voltage V of the second half group of storage battery packjThe first half group of injection current signals I1And a second half group injection current signal I2Calculating internal resistance rn of the first half group of storage battery pack1And internal resistance rn of the second half group of storage battery pack2；
Step S4, if I1/I2>1.5, controlling the first single-pole double-throw switch and the second single-pole double-throw switch to be closed towards the other side, exchanging the front half group of storage battery pack with the rear half group of storage battery pack, and returning to the step S2; if I1/I2<1.5, go to step S5;
step S5, according to internal resistance rn of the first half group of storage battery packs1And internal resistance rn of the second half group of storage battery pack2Judging the vulcanization degree of the storage battery pack;
and step S6, selecting the desulphurization pulse signals with different frequencies according to the degree of vulcanization, and carrying out desulphurization on the storage battery pack.
6. The method for removing sulfur on line from the storage battery based on the variable frequency signal according to claim 5, wherein the step S2 comprises the following steps:
step S21, the internal resistance detection module directly detects the characteristic signal attenuation voltage V of each storage battery in the first half group of storage battery packsiAnd the characteristic signal attenuation voltage V of each storage battery in the second half group of storage battery packj；
Step S22, obtaining characteristic signal attenuation voltage V of middle storage battery of the first half group of storage battery packs0.25nCharacteristic signal attenuation voltage V of middle storage battery of second half group storage battery pack0.75n；
Step S23, acquiring the total input current I of the signal source;
step S24, according to V0.25n/V0.75n＝I1/I2And I ═ I1+I2Calculated to obtain I1And I2The size of (2).
7. The method for online sulfur removal of storage batteries based on variable frequency signals as claimed in claim 6, wherein the internal resistance rn of the first half group of storage batteries is1The expression of (a) is:
internal resistance rn of the second half group of storage battery pack2The expression of (a) is:
8. a process according to claim 5The method for online removing sulfur from the storage battery based on the variable frequency signal is characterized in that in the step S4, when I is1/I2>1.5, exchanging the front half group of the storage battery pack with the rear half group of the storage battery pack, returning to the step S2, and if I is obtained by calculation1/I2If the ratio of the internal resistance of the first half group of storage battery pack to the internal resistance of the second half group of storage battery pack is still larger than 1.5, the internal resistances of the first half group of storage battery pack and the second half group of storage battery pack obtained twice are averaged, and the process proceeds to step S5.
9. The method for removing sulfur on line from the storage battery based on the variable frequency signal according to claim 5, wherein the step S5 comprises the following steps: and acquiring the vulcanization degree of the storage battery according to the standard internal resistance information table of the storage battery.
10. The method for the online sulfur removal of the storage battery based on the variable frequency signal according to claim 5, characterized by further comprising the following steps:
and step S7, standing for a period of time after the sulfur removal is finished, retesting the internal resistance, judging the vulcanization effect, and if the vulcanization effect is poor, readjusting the frequency of the pulse signal to further remove the sulfur from the storage battery.
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