CN105510838A - Rechargeable battery on-line detection device and method for detecting internal resistance based on same - Google Patents
Rechargeable battery on-line detection device and method for detecting internal resistance based on same Download PDFInfo
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- CN105510838A CN105510838A CN201510955168.2A CN201510955168A CN105510838A CN 105510838 A CN105510838 A CN 105510838A CN 201510955168 A CN201510955168 A CN 201510955168A CN 105510838 A CN105510838 A CN 105510838A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
Disclosed are a rechargeable battery on-line detection device and a method for detecting internal resistance based on the same, relating to the field of battery detection. The need for a rechargeable battery on-line measurement method and a rechargeable battery on-line measurement device which are of high measurement precision and wide application scope and do not affect the capacity and life of batteries is satisfied. An alternating-current signal generator sends out a sine wave signal; the signal is loaded to the two ends of a rechargeable battery after being sampled by an alternating current sampling circuit, adjusted by an alternating current feedback adjusting unit and amplified by an alternating current power amplifier, and a voltage signal is formed; the voltage signal and the sine wave signal output by the alternating-current signal generator are subject to multiplication through an analog multiplier after the voltage signal is amplified by a voltage isolating and amplifying circuit, and then, the voltage signal is input to a central processing unit after being filtered by a low-pass filter and amplified by a direct-current amplifier and subject to analog-to-digital conversion through an A/D converter; and the central processing unit performs a division operation to get the value of internal resistance of the rechargeable battery, and the value is displayed through a keyboard and display circuit. The method is further suitable for measuring the internal resistance of other batteries.
Description
Technical field
The present invention relates to battery detecting field.
Background technology
The major parameter assessed battery quality is at present the internal resistance of cell.Internal resistance is the important technology index weighing battery performance.Under normal circumstances, the large current discharging capability of the battery that internal resistance is little is strong, and the battery discharge ability that internal resistance is large is weak.The method detecting the internal resistance of cell mainly contains: (1) densimetry: densimetry carrys out the internal resistance of estimating battery mainly through the density measuring battery electrolyte, the internal resistance measurement of normal open type lead-acid battery, but is not suitable for the internal resistance measurement of sealed lead acid storage battery.The accommodation of the method is narrow.(2) open-circuit voltage method: open-circuit voltage method is that the terminal voltage by measuring accumulator estimates accumulator internal resistance, and precision is very poor, even easily derives a wrong conclusion.Even if because a capacity has become very little accumulator, under floating charge state its terminal voltage still show very normal.(3) direct-current discharge method: direct-current discharge method is exactly by carrying out transient large current discharge to battery, and the transient voltage measured on battery falls, and calculates the internal resistance of cell by Ohm law.But it exists certain defect, heavy-current discharge causes damage comparatively large to accumulator, thus affects capacity and the life-span of accumulator.(4) ac-current inject method: ac-current inject method is by injecting a constant AC signal I to accumulator
s, measure the voltage responsive signal V at accumulator two ends
o, and both phase differential θ, by formula of impedance
and R=Zcos θ determines the internal resistance R of accumulator.The parameter needed due to the method is more, and then disturbing factor is more, adds the complicacy of system, easily affects measuring accuracy simultaneously.
As can be seen here, a kind of good rechargeable battery On-line Measuring Method and on-line measurement instrument is not had at present.
Summary of the invention
The present invention in order to meet having that measuring accuracy is high, the demand of the wide rechargeable battery On-line Measuring Method of the capacity that do not affect accumulator and life-span, the scope of application and device, propose rechargeable battery on-line measuring device and detect the method for internal resistance based on this device.
Rechargeable battery on-line measuring device, it comprises accumulator 3; It also comprises AC signal generator 1, alternating current power amplifier 2, voltage isolating amplifier circuit 4, analog multiplier 5, low-pass filter 6, direct current amplifier 7, A/D converter 8, central processing unit 9, alternating current sample circuit 11 and alternating current feedback regulation unit 12;
The signal output part of AC signal generator 1 connects the signal input part of alternating current power amplifier 2 and a multiplying signal input end of analog multiplier 5 simultaneously; The sampled signal output terminal of alternating current power amplifier 2 connects the sampled signal input end of alternating current sample circuit 11; The sampled signal output terminal of alternating current sample circuit 11 connects the sampled signal input end of alternating current feedback regulation unit 12; The feedback signal output of alternating current feedback regulation unit 12 connects the feedback signal input terminal of AC signal generator 1;
The power amplifier output terminal of alternating current power amplifier 2 connects the signal input part of accumulator 3; The voltage signal output end of accumulator 3 connects the input end of voltage isolating amplifier circuit 4; Another multiplying signal input end of the voltage amplification signal output part connecting analog multiplier 5 of voltage isolating amplifier circuit 4;
The signal output part of analog multiplier 5 connects the filtering signal input end of low-pass filter 6; The filtering signal output terminal of low-pass filter 6 connects the amplifying signal input end of direct current amplifier 7; The amplifying signal output terminal of direct current amplifier 7 connects the signal input part of A/D converter 8; The signal output part of A/D converter 8 connects the signal input part of central processing unit 9.
Detect the method for internal resistance based on rechargeable battery on-line measuring device, the method for this detection internal resistance is:
The sine wave signal that AC signal generator 1 exports is:
u
1(ωt)＝Acosωt(1)
The corresponding signal that this simple sinusoidal alternating current samples via alternating current sample circuit 11, alternating current feedback regulation unit 12 feeds back, alternating current power amplifier 2 is carried in accumulator 3 two ends after amplifying is:
U
2wherein, θ injects the interchange of energy storage rechargeable battery and the phase differential of its two end signal to (ω t)=Bcos (ω t+ θ) (2), and ω is the angular frequency of sine wave signal; T is the time; A is for being signal amplitude with B;
Input to analog multiplier 5 by sine wave signal, the corresponding signal at accumulator 3 two ends inputs to analog multiplier 5 after superpotential isolating amplifier circuit 4, after analog multiplier 5 carries out multiplying, obtain operation result:
u(ωt)＝k×u
1(ωt)×u
2(ωt)＝kABcosωt×cos(ωt+θ)＝0.5kAB[cosθ+cos(2ωt+θ)](3)
Wherein, k is the amplification coefficient of analog multiplier;
The operation result obtained after analog multiplier 5 carries out multiplying filters alternating component in formula (3) after low-pass filter 6 filters, then amplify through direct current amplifier 7, A/D converter 8 obtains after carrying out analog to digital conversion:
U=0.5kABcos θ (4) surveys internal resistance principle according to AC method again and obtains:
Wherein, I is the maximal value of AC constant-current source signal;
In central processing unit 9, formula (5) is brought into and can obtain internal resistance R in formula (4) and be:
In formula (6), k, A, I are known quantities, and u is the magnitude of voltage obtained after low-pass filter 6 filtering alternating component.
Beneficial effect: rechargeable battery on-line measuring device of the present invention and the method based on this device detection internal resistance, a sine wave signal is sent by AC signal generator, this sine wave signal samples through alternating current sample circuit, alternating current feedback regulation unit is carried in the two ends of rechargeable battery again after alternating current power amplifier amplifies after regulating, at the two ends coating-forming voltage signal of rechargeable battery, the sine wave signal that this voltage signal exports with AC signal generator after superpotential isolating amplifier circuit amplifies carries out after multiplying through analog multiplier, again through low-pass filter filtering, central processing unit is inputed to after direct current amplifier amplification and A/D converter carry out analog to digital conversion, the resistance of the internal resistance obtaining rechargeable battery after division arithmetic is carried out through central processing unit, and be presented on keyboard and display circuit.The present invention by said process, meets having that measuring accuracy is high, the demand of rechargeable battery On-line Measuring Method that the capacity that do not affect accumulator and life-span, the scope of application are wide and device.The present invention is also applicable to the internal resistance of measuring other batteries.
Accompanying drawing explanation
Fig. 1 is the structural representation of rechargeable battery on-line measuring device.
Embodiment
Embodiment one, reference Fig. 1 illustrate present embodiment, the rechargeable battery on-line measuring device described in present embodiment, and it comprises accumulator 3; It also comprises AC signal generator 1, alternating current power amplifier 2, voltage isolating amplifier circuit 4, analog multiplier 5, low-pass filter 6, direct current amplifier 7, A/D converter 8, central processing unit 9, alternating current sample circuit 11 and alternating current feedback regulation unit 12;
The signal output part of AC signal generator 1 connects the signal input part of alternating current power amplifier 2 and a multiplying signal input end of analog multiplier 5 simultaneously; The sampled signal output terminal of alternating current power amplifier 2 connects the sampled signal input end of alternating current sample circuit 11; The sampled signal output terminal of alternating current sample circuit 11 connects the sampled signal input end of alternating current feedback regulation unit 12; The feedback signal output of alternating current feedback regulation unit 12 connects the feedback signal input terminal of AC signal generator 1;
The power amplifier output terminal of alternating current power amplifier 2 connects the signal input part of accumulator 3; The voltage signal output end of accumulator 3 connects the input end of voltage isolating amplifier circuit 4; Another multiplying signal input end of the voltage amplification signal output part connecting analog multiplier 5 of voltage isolating amplifier circuit 4;
The signal output part of analog multiplier 5 connects the filtering signal input end of low-pass filter 6; The filtering signal output terminal of low-pass filter 6 connects the amplifying signal input end of direct current amplifier 7; The amplifying signal output terminal of direct current amplifier 7 connects the signal input part of A/D converter 8; The signal output part of A/D converter 8 connects the signal input part of central processing unit 9.
Rechargeable battery on-line measuring device described in present embodiment, its principle of work is: the AC signal generator 1 of this device inside produces a frequency stabilization, symmetry, sine wave signal that degree of distortion is low, and this sine wave signal exports simple sinusoidal alternating current after inputing to and carrying out power amplification in alternating current power amplifier 2; This simple sinusoidal alternating current samples via alternating current sample circuit 11, alternating current feedback regulation unit 12 inputs to AC signal generator 1 after feeding back, realize the size of the sine wave signal output current regulating AC signal generator 1 to export, and then the electric current that alternating current power amplifier 2 is exported keeps stable object.After sampling and feedback, the electric current that alternating current power amplifier 2 exports is called steady current.This part is a closed-loop control system, belongs to current negative feedback circuit.
Described steady current is carried in the two ends of the accumulator 3 of charging, produces voltage at the two ends of the accumulator 3 of charging, and this voltage inputs to analog multiplier 5 after superpotential isolating amplifier circuit 4 isolation is amplified; The sine wave signal that AC signal generator 1 exports also inputs to analog multiplier 5; After multiplying is carried out in analog multiplier 5 inside, this operation result amplifies through low-pass filter 6 filtering, direct current amplifier 7, AD converter 8 inputs to central processing unit 9 after carrying out analog to digital conversion, obtains the resistance of the internal resistance of rechargeable battery after central processing unit processes.
Rechargeable battery on-line measuring device of the present invention, achieves the high demand of measuring accuracy by the above-mentioned course of work, meets simultaneously and does not affect the capacity of accumulator and the demand in life-span when heavy-current discharge, and in addition, the scope of application of this device is wider.
Detect the meaning of the internal resistance of cell:
1, one of the project of factory inspection in factory.During 2, assembled battery group, the close battery unit of internal resistance need be selected and form one group.3, the capacity Ah because of battery is larger, and internal resistance is less, therefore can judge battery capacity roughly according to internal resistance size.4, the internal resistance that shows as that cell degradation and inefficacy are outstanding afterwards increases, and therefore test battery internal resistance just can judge the degree of aging of battery fast.5, in electric battery maintenance process, need the internal resistance of the often each battery unit of test, the unit that internal resistance increases is picked out, it is individual good to change.
Standby power supply when accumulator has a power failure as power-supply system, has been widely used in the industries such as commercial production, traffic, communication.If battery failure or off-capacity, just likely cause a serious accident, so comprehensive on-line monitoring must be carried out to the operational factor of accumulator.One of important symbol of battery condition is exactly its internal resistance.Be no matter that accumulator is about to lose efficacy, off-capacity or discharge and recharge improper, can embody from its internal resistance change.Therefore by measuring accumulator internal resistance, its duty can be assessed.
The present invention is for research and development and produce the unit of rechargeable battery and enterprise provides necessary checkout equipment, and the safe operation for energy-accumulating power station provides technical support and guarantee, for the product of China's rechargeable battery provides production assurance.
Embodiment two, this embodiment are further illustrating the rechargeable battery on-line measuring device described in embodiment one, in present embodiment, it also comprises Key and display circuit 10, and the display input end of Key and display circuit 10 connects the display output terminal of central processing unit 9.
Key and display circuit 10 is for showing the size of the resistance of the internal resistance of the rechargeable battery obtained after central processing unit 9 processes.
Embodiment three, detect the method for internal resistance based on the rechargeable battery on-line measuring device described in embodiment one or two, in present embodiment, the method for this detection internal resistance is:
The sine wave signal that AC signal generator 1 exports is:
u
1(ωt)＝Acosωt(1)
The corresponding signal that this simple sinusoidal alternating current samples via alternating current sample circuit 11, alternating current feedback regulation unit 12 feeds back, alternating current power amplifier 2 is carried in accumulator 3 two ends after amplifying is:
U
2(ω t)=Bcos (ω t+ θ) (2) wherein
,θ injects the interchange of energy storage rechargeable battery and the phase differential of its two end signal, and ω is the angular frequency of sine wave signal; T is the time; A is for being signal amplitude with B;
Input to analog multiplier 5 by sine wave signal, the corresponding signal at accumulator 3 two ends inputs to analog multiplier 5 after superpotential isolating amplifier circuit 4, after analog multiplier 5 carries out multiplying, obtain operation result:
u(ωt)＝k×u
1(ωt)×u
2(ωt)＝kABcosωt×cos(ωt+θ)＝0.5kAB[cosθ+cos(2ωt+θ)](3)
Wherein, k is the amplification coefficient of analog multiplier;
The operation result obtained after analog multiplier 5 carries out multiplying filters alternating component in formula (3) after low-pass filter 6 filters, then amplify through direct current amplifier 7, A/D converter 8 obtains after carrying out analog to digital conversion:
U=0.5kABcos θ (4) surveys internal resistance principle according to AC method again and obtains:
Wherein, I is the maximal value of AC constant-current source signal;
In central processing unit 9, formula (5) is brought into and can obtain internal resistance R in formula (4) and be:
In formula (6), k, A, I are known quantities, and u is the magnitude of voltage obtained after low-pass filter 6 filtering alternating component
Present embodiment describes a kind of method detecting internal resistance.Internal resistance detection is carried out to rechargeable battery, the theoretical foundation being the quality and serviceable life thereof that judge energy storage rechargeable battery with its internal resistance.
The internal resistance detection principle of rechargeable battery is: use alternating current to be added on tested rechargeable battery (accumulator), calculated the internal resistance of tested battery by the voltage and phasometer measuring tested battery.
The method adopts and exchanges continuous current source, this current source stability and accuracy high, use the technology such as the amplification of analog multiplier, low-pass filtering, direct current, A/D conversion simultaneously, make last internal resistance measurement be converted to measurement to DC voltage.Surveying work schematic diagram as shown in Figure 1.
AC signal generator 1 produces a sine wave signal, and this sine wave signal inputs to analog multiplier 5, and meanwhile, this sine wave signal exports simple sinusoidal alternating current after alternating current power amplifier 2 carries out power amplification; This simple sinusoidal alternating current samples via alternating current sample circuit 11, alternating current feedback regulation unit 12 inputs to AC signal generator 1 after feeding back, and makes alternating current power amplifier 2 stable output electric current by feedback regulation; This steady current is carried in the two ends of the accumulator 3 of charging and produces voltage, and this voltage inputs to analog multiplier 5 after superpotential isolating amplifier circuit 4 isolation is amplified; Analog multiplier 5 offset of sinusoidal ripple signal and through voltage isolating amplifier circuit 4 carry out isolate amplify after voltage carry out multiplying, this operation result inputs to central processing unit 9 after low-pass filter 6 filtering, direct current amplifier 7 amplify and AD converter 8 carries out analog to digital conversion, obtains the resistance of the internal resistance of rechargeable battery after central processing unit 9 carries out division arithmetic.
Embodiment four, present embodiment are further illustrating the method based on rechargeable battery on-line measuring device detection internal resistance described in embodiment three, and in present embodiment, the internal resistance measurement scope of the method is 0.01m Ω-1 Ω.
The accuracy of the internal resistance measurement scope of the method is ± 1.0%rdg ± 5dgt.
Embodiment five, present embodiment are further illustrating the method based on rechargeable battery on-line measuring device detection internal resistance described in embodiment three, in present embodiment, and the voltage measurement scope 0.000V-220V of the method.
The accuracy of the voltage measurement scope of the method is ± 0.2%rdg ± 5dgt.
The present invention makes improvement in measuring method, improves measurement index precision, rapidly and efficiently can complete the on-line checkingi of rechargeable battery.Compare existing measuring technique such as: densimetry, open-circuit voltage method, direct-current discharge are sent out, ac-current inject method, and these methods self exist more shortcoming, detection architecture precision is not enough or damage larger to battery itself.This method, when dropping to minimum by cell damage, can also realize carrying out high-acruracy survey to battery, meet demand.
Claims (4)
1. rechargeable battery on-line measuring device, it comprises accumulator (3); It is characterized in that, it also comprises AC signal generator (1), alternating current power amplifier (2), voltage isolating amplifier circuit (4), analog multiplier (5), low-pass filter (6), direct current amplifier (7), A/D converter (8), central processing unit (9), alternating current sample circuit (11) and alternating current feedback regulation unit (12);
The signal output part of AC signal generator (1) connects the signal input part of alternating current power amplifier (2) and a multiplying signal input end of analog multiplier (5) simultaneously; The sampled signal output terminal of alternating current power amplifier (2) connects the sampled signal input end of alternating current sample circuit (11); The sampled signal output terminal of alternating current sample circuit (11) connects the sampled signal input end of alternating current feedback regulation unit (12); The feedback signal output of alternating current feedback regulation unit (12) connects the feedback signal input terminal of AC signal generator (1);
The power amplifier output terminal of alternating current power amplifier (2) connects the signal input part of accumulator (3); The voltage signal output end of accumulator (3) connects the input end of voltage isolating amplifier circuit (4); Another multiplying signal input end of voltage amplification signal output part connecting analog multiplier (5) of voltage isolating amplifier circuit (4);
The signal output part of analog multiplier (5) connects the filtering signal input end of low-pass filter (6); The filtering signal output terminal of low-pass filter (6) connects the amplifying signal input end of direct current amplifier (7); The amplifying signal output terminal of direct current amplifier (7) connects the signal input part of A/D converter (8); The signal output part of A/D converter (8) connects the signal input part of central processing unit (9).
2. detect the method for internal resistance based on rechargeable battery on-line measuring device according to claim 1, it is characterized in that, the method for this detection internal resistance is:
The sine wave signal that AC signal generator (1) exports is:
u
1(ωt)＝Acosωt(1)
This simple sinusoidal alternating current via the corresponding signal being carried in accumulator (3) two ends after alternating current sample circuit (11) sampling, alternating current feedback regulation unit (12) feedback, alternating current power amplifier (2) amplification is:
u
2(ωt)＝Bcos(ωt+θ)(2)
Wherein, θ injects the interchange of energy storage rechargeable battery and the phase differential of its two end signal, and ω is the angular frequency of sine wave signal; T is the time; A is for being signal amplitude with B;
Analog multiplier (5) is inputed to by sine wave signal, the corresponding signal at accumulator (3) two ends inputs to analog multiplier (5) after superpotential isolating amplifier circuit (4), after analog multiplier (5) carries out multiplying, obtain operation result:
u(ωt)＝k×u
1(ωt)×u
2(ωt)＝kABcosωt×cos(ωt+θ)＝0.5kAB[cosθ+cos(2ωt+θ)](3)
Wherein, k is the amplification coefficient of analog multiplier;
The operation result obtained after analog multiplier (5) carries out multiplying filters the alternating component in formula (3) after low-pass filter (6) filters, then obtains after carrying out analog to digital conversion through direct current amplifier (7) amplification, A/D converter (8):
u＝0.5kABcosθ(4)
Survey internal resistance principle according to AC method again to obtain:
Wherein, I is the maximal value of AC constant-current source signal;
In central processing unit (9), formula (5) is brought into and can obtain internal resistance R in formula (4) and be:
In formula (6), k, A, I are known quantities, and u is the magnitude of voltage obtained after low-pass filter (6) filtering alternating component.
3. the method detecting internal resistance based on rechargeable battery on-line measuring device according to claim 2, it is characterized in that, the internal resistance measurement scope of the method is 0.01m Ω-1 Ω.
4. the method detecting internal resistance based on rechargeable battery on-line measuring device according to claim 2, is characterized in that, the voltage measurement scope 0.000V-220V of the method.
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| CN109557476A (en) * | 2018-12-05 | 2019-04-02 | 珠海朗尔电气有限公司 | Measuring device and measuring method |
| CN109581238A (en) * | 2018-12-05 | 2019-04-05 | 珠海东帆科技有限公司 | A kind of internal resistance of cell measuring circuit and measurement method |
| CN110471002A (en) * | 2019-08-27 | 2019-11-19 | 深圳市新威尔电子有限公司 | Improve the method and high-precision internal resistance detection equipment of internal resistance instrument precision |
| CN111830420A (en) * | 2020-06-29 | 2020-10-27 | 哈尔滨工程大学 | On-line measurement method for internal resistance of battery by adopting SOGI (short-circuit average current) |
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Application publication date: 20160420 |