CN205427161U - Hold battery test system - Google Patents

Abstract

The utility model provides a hold battery test system, detecting system includes voltage sample unit, current sample unit, signal driver unit, excitation generation unit and microprocessing unit, wherein: excitation generation unit produces the electric current drive signal who exports a plurality of different frequencies simultaneously according to microprocessing unit's control signal, the signal driver unit is applyed at the battery both ends after being used for the electric current drive signal processing with the output of excitation generation unit, the voltage sample unit for the magnitude of voltage at sampling battery both ends, the current sample unit is arranged in the current value in sampling excitation return circuit, microprocessing unit for according to a plurality of magnitude of voltages of sampling and the state parameter of a plurality of current value formation battery. The utility model discloses an electric current drive signal of a plurality of superimposed different frequencies is once applyed at battery both ends, accumulator state 's more than one parameter can be obtained to influence to accurately evaluate the state of battery more comprehensively.

Description

Ice storing time system

Technical field

This utility model relates to ice storing time field, more particularly, it relates to a kind of ice storing time system.

Background technology

At present, power system transformer substation operates power supply, communication base station and electric power, machine room UPS, and energy-accumulating power station, photovoltaic plant, communication base station, electric automobile etc. use accumulator as backup power system the most in a large number.These accumulator are the most rarely needed, but come into operation once needs, if battery failure or off-capacity, it would be possible to cause a serious accident.So carry out detecting the most extremely important to the state of the accumulator being in back-up source state, by detection, it is possible to find there is the accumulator of flaw and changed, thus avoiding potential safety hazard and security incident, both ensure that the reliability of power supply, also reduce the cost of power supply.

The internal resistance of accumulator is an important parameter that more can reflect battery condition than battery tension, and either accumulator will lose efficacy or off-capacity, can embody from its internal resistance changes.Therefore by measuring accumulator internal resistance, its duty can be estimated.

As it is shown in figure 1, be the universal model of accumulator internal resistance.When carrying out accumulator internal resistance and measuring, need to measure at one and on Frequency point, measure the plane conductor electric capacity C in the ohmage R1 of accumulator, polarization resistance R2, electrolyte and the inner parameter of the accumulator such as lead-in wire and structure inductance L, and by calculating the internal resistance value obtaining accumulator.But, existing exchange injection method and direct-current discharge method are all to measure the inner parameter of accumulator on a measurement Frequency point, therefore can only measure the accumulator internal resistance value at some test Frequency point, it is impossible to truly reflect the inner parameter of accumulator.

In order to solve this problem, there is producer both at home and abroad on the basis of AC measurment method, use the method changing measurement frequency to measure the internal resistance value of accumulator under different frequency, and extrapolated the situation of internal storage battery by the accumulator internal resistance value under different frequency.But this mode testing time is long, calculates complexity, simultaneously because repeatedly test the impact on accumulator, often result in certain parameter drift of accumulator and cause final result still can not truly reflect the internal state of accumulator.

Utility model content

The technical problems to be solved in the utility model is, for the accurate not problem of above-mentioned ice storing time testing time length, testing result, it is provided that a kind of ice storing time system.

This utility model solves the technical scheme of above-mentioned technical problem, a kind of ice storing time system is provided, described detecting system includes voltage sampling unit, current sampling unit, signal driving unit, excitation generating unit and microprocessing unit, wherein: described excitation generating unit produces according to the control signal of microprocessing unit and exports the current excitation signal of multiple different frequency simultaneously；Described signal driving unit and accumulator constitute energized circuit, and for by after-applied at accumulator two ends for the current excitation signal processing of excitation generating unit output；Described voltage sampling unit, multiple magnitudes of voltage of the most corresponding different current excitation signals for sample battery two ends；Described current sampling unit is multiple current values of the most corresponding different current excitation signals in energized circuit of sampling；Described microprocessing unit, generates the state parameter of accumulator for the multiple magnitudes of voltage according to sampling and multiple current value.

In ice storing time system described in the utility model, encourage generating unit to include multiple agitator being connected in parallel described in utility model, and the outfan of the plurality of agitator is simultaneously connected to encourage the output port of generating unit.

In ice storing time system described in the utility model, described signal driving unit includes the power amplification circuit for input signal is done processing and amplifying.

In ice storing time system described in the utility model, described voltage sampling unit and current sampling unit include analog to digital conversion circuit respectively.

Ice storing time system of the present utility model has the advantages that the current excitation signal of the different frequency by once applying multiple superposition at accumulator two ends, the multiple parameters affecting battery condition can be obtained, thus assess the state of accumulator more comprehensively, exactly.

Different from using multiple frequencies to test internal resistance value respectively, this utility model not only remains the amplitude change under different frequency, also add the phase place change under different frequency, the parameters such as accumulator ohmage, polarization resistance, inductance, electric capacity can be calculated more accurately and quickly, more accurately reflect the state of accumulator.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the internal resistance model of accumulator.

Fig. 2 is the schematic diagram of this utility model ice storing time system embodiment.

Detailed description of the invention

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.

As in figure 2 it is shown, be the schematic diagram of this utility model ice storing time system embodiment, it can be used for accumulator parameter detection, thus knows the performance state of accumulator.Ice storing time system in the present embodiment includes voltage sampling unit 13, current sampling unit 15, signal driving unit 12, excitation generating unit 14 and microprocessing unit 11, and wherein the input of excitation generating unit 14 is connected to microprocessing unit 11, outfan is connected to the input of signal driving unit 12；Two outfans of signal driving unit 12 are connected respectively to the two ends of accumulator 20, form energized circuit；Two inputs of voltage sampling unit 13 are connected respectively to the two ends of accumulator 20, outfan is connected to microprocessing unit 11；The input of current sampling unit 15 has an induction coil and outfan is connected to microprocessing unit 11.Above-mentioned voltage sampling unit 13, current sampling unit 15, signal driving unit 12, excitation generating unit 14 can be formed by the connection of existing electronic component, and microprocessing unit 11 then can be had the IC chip of software to constitute by operation.

Above-mentioned excitation generating unit 14 can produce the current excitation signal of multiple different frequencies according to the control signal of microprocessing unit 11, and exported by the plurality of current excitation signal simultaneously.Signal driving unit 12 is after-applied at accumulator 20 two ends for the current excitation signal processing exported by excitation generating unit 14.Voltage sampling unit 13 is multiple magnitudes of voltage of the most corresponding different current excitation signals for sample battery 20 two ends, and especially, voltage sampling unit 13 exports microprocessing unit 11 after the analog voltage signal of sampling does analog digital conversion.Current sampling unit 15 is multiple current values of the most corresponding different current excitation signals in energized circuit of sampling, and especially, current sampling unit 15 exports microprocessing unit 11 after the analog current signal of sampling does analog digital conversion.

The current excitation signal of above-mentioned excitation generating unit 14 output is not the AC signal of single-frequency, but the composite signal of a multiple frequency of superposition.When implementing, excitation generating unit 14 can include multiple agitator (or oscillating circuit) being connected in parallel, and the outfan of the plurality of agitator is simultaneously connected to encourage the output port of generating unit 14.

Especially, for ensureing accuracy, signal driving unit 12 includes the power amplification circuit for input signal is done processing and amplifying, the i.e. after-applied two ends to accumulator 20 of the amplified process of current excitation signal.Voltage sampling unit 13 and current sampling unit 15 include analog to digital conversion circuit respectively.

Microprocessing unit 11 generates the plane conductor electric capacity in the internal resistance value of battery condition parameter, such as accumulator, the ohmage of accumulator, polarization resistance, electrolyte and lead-in wire and structure inductance etc. for the multiple magnitudes of voltage according to sampling and multiple current value.

Specifically, above-mentioned microprocessing unit 11 first magnitude of voltage to sampling isolates the voltage phase angle under different frequency by Fourier transformation；Then the plane conductor electric capacity C and lead-in wire and structure inductance L obtained in the ohmage R1 of accumulator, polarization resistance R2, electrolyte is calculated according at least two current excitation signal and the sample voltage value of correspondence, voltage phase angle and sampled current value；The internal resistance value of accumulator under different current excitation signals is calculated with lead-in wire and structure inductance finally according to the plane conductor electric capacity in ohmage, polarization resistance, electrolyte.

According to physics's general knowledge, the impedance of plane conductor electric capacity C, lead-in wire and structure inductance L in electrolyte is respectively as follows:

R_L=2 π fLi

$R_C=\frac{-i}{2\mathrm{\π}fC}$

The impedance R of the most whole accumulator 20_zFor:

$\begin{array}{c}{R}_z=R_1+2\mathrm{\πfLi}+\frac{R_2\×[-i/\left(2\mathrm{\πfC}\right)]}{R_2+[-i/\left(2\mathrm{\πfC}\right)]}\\ =R_1+\frac{R_2}{{[R_2\×\left(2\mathrm{\πfC}\right)]}^2+1}+2\mathrm{\πfLi}-\frac{R_2^2\×\left(2\mathrm{\πfC}\right)i}{{[R_2\×\left(2\mathrm{\πfC}\right)]}^2+1}\end{array}.$

Making carrying out ice storing time, microprocessing unit 11 first controls to encourage generating unit 14 to produce frequency and is respectively the current excitation signal of f1 and f2, and exciting current is applied to the two ends of accumulator 20 by signal driving unit 12.Micro-control unit 11 voltage sampling unit 13 is sampled obtain magnitude of voltage, by Fourier transformation, calculated rate is that the voltage signal of f1 and f2 component is respectively U1 (phase angle is θ 1) and U2 (phase angle is θ 2).Microprocessing unit 11 can obtain according to accumulator internal resistance formula:

$\frac{U_1\×\cos {\mathrm{\θ}}_1}{l_1}=R_1+\frac{R_2}{{[R_2\×\left(2\mathrm{\π}{f}_{1}C\right)]}^2+1}---------\left(1\right)$

$\frac{U_1\×\sin {\mathrm{\θ}}_1}{l_1}=2\mathrm{\π}{f}_{1}L-\frac{R_2^2\×\left(2\mathrm{\π}{f}_{1}C\right)}{{[R_2\×\left(2\mathrm{\π}{f}_{1}C\right)]}^2+1}---------\left(2\right)$

$\frac{U_2\×\cos {\mathrm{\θ}}_2}{l_1}=R_1+\frac{R_2}{{[R_2\×\left(2\mathrm{\π}{f}_{2}C\right)]}^2+1}---------\left(3\right)$

$\frac{U_2\×\sin {\mathrm{\θ}}_2}{l_1}=2\mathrm{\π}{f}_{2}L-\frac{R_2^2\×\left(2\mathrm{\π}{f}_{2}C\right)}{{[R_2\×\left(2\mathrm{\π}{f}_{2}C\right)]}^2+1}---------\left(4\right)$

Micro-control unit 11, by solving 4 equation group above, i.e. can obtain obtaining plane conductor electric capacity C in the ohmage R1 of accumulator, polarization resistance R2, electrolyte and lead-in wire and these 4 unknown quantitys of structure inductance L, and further according to battery impedance R_zFormula calculates the internal resistance value of accumulator under different current excitation signal.

Above-mentioned ice storing time system, by once applying the current excitation signal of the different frequency of multiple superposition at accumulator two ends, can obtain the multiple parameters affecting battery condition, thus assess the state of accumulator more comprehensively, exactly.

The above; it is only this utility model preferably detailed description of the invention; but protection domain of the present utility model is not limited thereto; any those familiar with the art is in the technical scope that this utility model discloses; the change that can readily occur in or replacement, all should contain within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with scope of the claims.

Claims (4)

1. an ice storing time system, it is characterized in that: described detecting system includes voltage sampling unit, current sampling unit, signal driving unit, excitation generating unit and microprocessing unit, wherein: described excitation generating unit produces according to the control signal of microprocessing unit and exports the current excitation signal of multiple different frequency simultaneously；Described signal driving unit and accumulator constitute energized circuit, and for by after-applied at accumulator two ends for the current excitation signal processing of excitation generating unit output；Described voltage sampling unit, multiple magnitudes of voltage of the most corresponding different current excitation signals for sample battery two ends；Described current sampling unit is multiple current values of the most corresponding different current excitation signals in energized circuit of sampling；Described microprocessing unit, generates the state parameter of accumulator for the multiple magnitudes of voltage according to sampling and multiple current value.

Ice storing time system the most according to claim 1, it is characterised in that: described excitation generating unit includes multiple agitator being connected in parallel, and the outfan of the plurality of agitator is simultaneously connected to encourage the output port of generating unit.

Ice storing time system the most according to claim 1, it is characterised in that: described signal driving unit includes the power amplification circuit for input signal is done processing and amplifying.

Ice storing time system the most according to claim 1, it is characterised in that: described voltage sampling unit and current sampling unit include analog to digital conversion circuit respectively.