CN110554328B - HHT-based storage battery internal resistance measurement method and system - Google Patents
HHT-based storage battery internal resistance measurement method and system Download PDFInfo
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- 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]
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Abstract
A method and a system for measuring internal resistance of a storage battery based on HHT comprise the following steps: s1: injecting a sinusoidal alternating current signal into a main loop formed by the storage battery and the sampling resistor, and collecting characteristic voltage signals U of the storage battery and the sampling resistor 1 And U 2 The method comprises the steps of carrying out a first treatment on the surface of the S2: respectively to characteristic voltage signals U 1 And U 2 Obtaining voltage signal effective value U of storage battery and sampling resistor through HHT 1rms And U 2rms The method comprises the steps of carrying out a first treatment on the surface of the S3: according to the resistance value, U of the sampling resistor 1rms And U 2rms And calculating to obtain the internal resistance of the storage battery through ohm law. The method and the system can realize the accuracy of the measurement of the internal resistance of the storage battery.
Description
Technical Field
The invention relates to the field of storage battery internal resistance measurement methods, in particular to a storage battery internal resistance measurement method and system based on HHT.
Background
The storage battery is an important energy storage device and has the advantages of convenience in use, excellent performance, stable voltage, safety, reliability and the like. With the development of national economy, the storage battery is applied to some traditional fields: power generation, navigation, aviation, military and the like, and also applied to some new energy fields: electric vehicles, renewable energy sources, new materials, equipment manufacturing and the like, and such a wide application range puts higher demands on the performance of the storage battery. The development of the storage battery for nearly 160 years has gradually matured technology, but the storage battery still has problems such as insufficient energy density, insufficient service life, untimely fault early warning and the like, the daily use of the storage battery is influenced by light problems, the power failure is caused by heavy problems, the fire disaster occurs, and the equipment is burnt out, so that the important economic loss is caused. Under the premise that the technical difficulties are not broken through, a method capable of effectively managing and monitoring the storage battery is urgently needed.
It is found that the storage battery is about to be scrapped, has insufficient capacity or is wrongly charged and discharged, and can be reflected through the change of the internal resistance, so that the change of the internal state of the storage battery can be known through detecting the internal resistance of the storage battery. At present, common internal resistance measurement methods of the storage battery are as follows: density method, open circuit voltage method, direct current discharge method, and alternating current injection method. The density method is to calculate the internal resistance of the accumulator by the density of the electrolyte, so that the method is suitable for open lead-acid accumulator but not for sealed lead-acid accumulator. The open-circuit voltage method is to measure the voltage at two ends of the accumulator and then calculate the internal resistance. In general, the error of the estimated result is large, and sometimes even an incorrect result is obtained. The direct current discharge method is to make the accumulator discharge the load resistance in a short time with large current, measure the instantaneous voltage drop at two ends of the accumulator, and calculate the internal resistance through ohm's law. The measuring method has simple conditions and stronger anti-interference capability of the measuring signal along with large current, but when the storage battery discharges in a short time, the current can reach tens or even hundreds of amperes, and the large current can cause a certain degree of damage to the inside of the storage battery, so that the same storage battery is inconvenient to measure for multiple times. In addition, the method can only carry out offline measurement, otherwise, potential safety hazards are caused to the system.
Ac injection is currently the more common method. The principle is that an alternating current signal with constant frequency and smaller amplitude is injected into the storage battery, the current passing through the storage battery and the voltage response at two ends of the current are measured, and then the internal resistance of the storage battery is calculated through ohm law. The method can ensure that the measuring system cannot influence the working state and the safety of the storage battery and the application system thereof, but the required measuring circuit is more complex, and the measuring signal is smaller and is often submerged in noise interference. Meanwhile, the frequencies of the alternating current signals are different, and the measured internal resistances of the storage batteries are also different. Thus, if this method is adopted, a solution to these several problems needs to be designed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a storage battery internal resistance measurement method and system based on HHT, which can solve the problem that the measurement of the internal resistance of the storage battery is inaccurate due to the existence of interference signals in the prior art.
The invention adopts the following technical scheme:
a HHT-based battery internal resistance measurement method, comprising:
s1: injecting a sinusoidal alternating current signal into a main loop formed by the storage battery and the sampling resistor, and collecting characteristic voltage signals U of the storage battery and the sampling resistor 1 And U 2 ；
S2: respectively to characteristic voltage signals U 1 And U 2 Obtaining voltage signal effective value U of storage battery and sampling resistor through HHT 1rms And U 2rms ；
S3: according to the resistance value, U of the sampling resistor 1rms And U 2rms Calculation of ohm's law to obtain accumulatorInternal resistance.
Preferably, the step S2 specifically includes the following steps:
s21: respectively to characteristic voltage signals U 1 And U 2 EEMD decomposition is adopted to obtain respective IMF components without modal aliasing;
s22: respectively carrying out Hilbert transform on the two groups of IMF components to obtain instantaneous frequency and instantaneous amplitude;
s23: obtaining an effective value U according to the frequency of a sinusoidal alternating current signal injected into a main loop and the instantaneous frequency obtained by Hilbert transformation 1rms And U 2rms 。
Preferably, the calculation formula of the internal resistance of the storage battery is as follows:
wherein: r is the resistance of the sampling resistor.
A HHT-based battery internal resistance measurement system, comprising:
the main circuit module is provided with a storage battery, a sampling resistor, a load and a switch which form a loop;
the sinusoidal alternating current signal injection module is used for injecting sinusoidal alternating current signals into the main circuit module;
the measuring module is used for collecting characteristic voltage signals U of the storage battery and the sampling resistor 1 And U 2 ；
The main control module is provided with a module for calculating the effective value of the voltage signal and is used for outputting a characteristic voltage signal U 1 And U 2 Obtaining effective value U of voltage signal through HHT 1rms And U 2rms The method comprises the steps of carrying out a first treatment on the surface of the The storage battery internal resistance calculating module is used for calculating the internal resistance r and U of the storage battery according to the sampling resistance 1rms And U 2rms And calculating to obtain the internal resistance of the storage battery through ohm law.
Preferably, the sinusoidal ac signal injection module further includes:
the sine function generation module is used for generating a sine alternating current signal;
a driving circuit for converting the sinusoidal alternating current signal into a current;
and the constant current power amplifier is used for stabilizing output current.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
according to the invention, the EEMD is used for decomposing the characteristic voltage signal to obtain the IMF component, and the Hilbert transform is used for obtaining the instantaneous frequency and the instantaneous amplitude of the IMF component to obtain the effective value of the voltage signal, so that the measured internal resistance of the storage battery can be accurately measured.
Drawings
FIG. 1 is a block diagram of a HHT-based battery internal resistance measurement system provided by the present invention;
FIG. 2 is a circuit diagram of a main circuit module of the present invention;
FIG. 3 is a schematic diagram of a sinusoidal AC signal injection module according to the present invention;
FIG. 4 is a circuit diagram of a sine function generation module;
FIG. 5 is a circuit diagram of a driving circuit and a constant current power amplifier module;
FIG. 6 is a flow chart of the method of the present invention;
FIG. 7 is a flowchart of step S2;
FIG. 8 is a computational flow diagram of EEMD decomposition;
the invention is further described in detail below with reference to the drawings and the specific examples.
Detailed Description
The invention is further described below by means of specific embodiments.
The invention provides a storage battery internal resistance measurement method based on HHT (Highway temperature), which comprises the following steps of:
s1: injecting a sinusoidal alternating current signal into a main loop formed by the storage battery and the sampling resistor, and collecting characteristic voltage signals U of the storage battery and the sampling resistor 1 And U 2 。
For example: the sinusoidal alternating current signal is sinusoidal current with amplitude of 100mA and frequency of 1kHz, and DC components in the measuring signal are filtered by using a blocking capacitor. According to the sampling theorem, the sampling frequency is required to be 2 times higher than the highest frequency in the signal, so that the information in the original signal is not lost after being sampled, and in consideration of the fact that the sampling frequency has great influence on EEMD decomposition, the sampling frequency is even 8 times higher than the highest frequency in the signal in order to restore the signal with high precision. Preferably, a frequency of 100kHz is used.
S2: referring to fig. 7, for the characteristic voltage signals U 1 And U 2 Obtaining voltage signal effective value U of storage battery and sampling resistor through HHT 1rms And U 2rms . The method specifically comprises the following steps:
s21: respectively to characteristic voltage signals U 1 And U 2 The EEMD decomposition is adopted to obtain respective IMF components without modal aliasing, as shown in fig. 8, and the EEMD decomposition steps include:
assume that:
the signal has at least one maximum point and one minimum point;
the characteristic time scale is defined by the time lapse between extreme points;
if the signal contains only inflection points and no extreme points, the extreme points may be obtained by differentiating one or more times before integrating the obtained components.
Setting the standard deviation of the white noise N (t) as N of the standard deviation of the original signal x (t) std Times and ensemble average times N, N std And N are respectively 0.7 and 100, and t represents time.
Adding white noise n to the original signal i (t) obtaining a new set of mixed signals:
X i (t)＝x(t)+n i (t) i＝1,2,…,N。
EMD decomposition is carried out on the mixed signals respectively to obtain the following components:
in the formula (1), m is the number of IMFs obtained after each EMD decomposition, c i (t)、r i (t) IMF component and residual component, respectively.
Performing ensemble averaging operation on the IMF obtained in the formula (1):
in the formula (2), c i (t) is the ith IMF component obtained by EEMD decomposition, and r (t) is the residual component. The result of EEMD decomposition is finally obtained as follows:
s22: the Hilbert transform is carried out on the two groups of IMF components to obtain instantaneous frequency and instantaneous amplitude, and the Hilbert transform step comprises the following steps:
hilbert transform is performed on each IMF to obtain:
and then obtain the analytic signal:
the instantaneous amplitude and phase are:
the instantaneous angular frequency and instantaneous frequency are:
thus, the hilbert-time spectrum can be expressed as:
this is the distribution of the instantaneous amplitude over the frequency-time plane. Wherein Re represents the real part of the complex number in brackets. It is to be noted that the residual component r i (t) is a monotonic function or a constant that characterizes the trend of the original signal, so here the remaining components are ignored when computing the hilbert spectrum.
S23: obtaining an effective value U according to the frequency of a sinusoidal alternating current signal injected into a main loop and the instantaneous frequency obtained by Hilbert transformation 1rms And U 2rms 。
S3: according to the resistance r and U of the sampling resistor 1rms And U 2rms And calculating to obtain the internal resistance of the storage battery through ohm law.
The calculation formula of the ohm law is as follows:
r, I in the formula (3) rms The effective value of the current signal flowing through the storage battery is divided into the internal resistance of the storage battery.
Since the sampling resistor and the storage battery are in the same main circuit, the alternating currents flowing through the sampling resistor and the storage battery are equal, and therefore, the ohm law can be used for obtaining:
the internal resistance of the battery is:
as shown in fig. 1, the invention further provides a HHT-based battery internal resistance measurement system, which includes a main circuit module 10, a sinusoidal ac signal injection module 20, a measurement module 30, a PC 40, a communication module 50, and the like. The main circuit module 10 includes a battery GB, a sampling resistor R, a load RL and a switch K, where the battery GB, the sampling resistor R, the load RL and the switch K form a loop, and the switch K is controlled to be closed, so that the battery RL discharges to the load RL.
As shown in fig. 2 to 5, the sinusoidal ac signal injection module is configured to inject a sinusoidal ac signal into the main circuit module 10. The sinusoidal alternating current signal injection module 20 comprises a sinusoidal function generating module 21, a driving circuit 22 and a constant current power amplifier 21. The SINE function generating module 21 is configured to generate a SINE voltage signal with a desired frequency, and referring to fig. 4, it may be implemented by a chip with a model ICL8038 in combination with a peripheral circuit, in which a SINE pin outputs the SINE voltage signal. The driving circuit 22 is used for converting the voltage output by the sine function generating module 21 into current. The constant current power amplifier 21 is used for stabilizing the output current of the constant current driving module, referring to fig. 5, the constant current power amplifier is realized by combining two TL082 and TDA2030 with a peripheral circuit, and one end of the resistor RV5 in the figure is used as the output end of the constant current power amplifier 21. Preferably, the input of the sine alternating current signal injection module 20 is a direct current power supply with the voltage of + -15V, and the output is sine current with the amplitude of 100mA and the frequency of 1 kHz.
The measurement module 30 is used for detecting characteristic voltage signals of the storage battery GB and the sampling resistor R in operation of the main circuit module 10 and transmitting the characteristic voltage signals to the main control module 10. Specifically, two blocking capacitors c are arranged and are respectively connected in series with one end of the sampling resistor R and one end of the storage battery GB, and direct current components in the measurement signals are filtered through the blocking capacitors c.
The communication module 50 is connected with the measurement module 30, and is configured to send a voltage signal of the measurement module 30 to the main control module 10, so as to convert an analog signal into a digital signal. Specifically, the alternating voltage components at the two ends of the sampling resistor R and the alternating voltage components at the two ends of the storage battery are subjected to analog-to-digital conversion (ADC), and then the Serial Communication Interface (SCI) is used to transfer data to the main control module 10.
The main control module 10 receives the voltage signal sent by the measurement module 30, and calculates the internal resistance of the storage battery by adopting the above-mentioned internal resistance measurement method of the storage battery of HHT. The device comprises a voltage signal effective value calculating module and a storage battery internal resistance calculating module, wherein the voltage signal effective value calculating module is used for calculating a characteristic voltage signal U 1 And U 2 Obtaining effective value U of voltage signal through HHT 1rms And U 2rms The method comprises the steps of carrying out a first treatment on the surface of the The storage battery internal resistance calculating module is used for calculating the resistance value r and U of the sampling resistor 1rms And U 2rms And calculating to obtain the internal resistance of the storage battery through ohm law.
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.
Claims (3)
1. A HHT-based battery internal resistance measurement method, comprising:
s1: injecting a sinusoidal alternating current signal into a main loop formed by the storage battery and the sampling resistor, and collecting characteristic voltage signals U of the storage battery and the sampling resistor 1 And U 2 ；
S2: respectively to characteristic voltage signals U 1 And U 2 Obtaining voltage signal effective value U of storage battery and sampling resistor through HHT 1rms And U 2rms The method specifically comprises the following steps:
s21: respectively to characteristic voltage signals U 1 And U 2 EEMD decomposition is adopted to obtain respective IMF components without modal aliasing;
s22: respectively carrying out Hilbert transform on the two groups of IMF components to obtain instantaneous frequency and instantaneous amplitude;
s23: obtaining an effective value U according to the frequency of a sinusoidal alternating current signal injected into a main loop and the instantaneous frequency obtained by Hilbert transformation 1rms And U 2rms ；
S3: according to sampling electricityResistance value, U 1rms And U 2rms The internal resistance of the storage battery is obtained through ohm law calculation, and the internal resistance calculation formula of the storage battery is as follows:
wherein: r is the resistance of the sampling resistor.
2. A HHT-based internal resistance measurement system for a storage battery, characterized in that a HHT-based internal resistance measurement method for a storage battery according to claim 1 is employed, comprising:
the main circuit module is provided with a storage battery, a sampling resistor, a load and a switch which form a loop;
the sinusoidal alternating current signal injection module is used for injecting sinusoidal alternating current signals into the main circuit module;
the measuring module is used for collecting characteristic voltage signals U of the storage battery and the sampling resistor 1 And U 2 ；
The main control module is provided with a module for calculating the effective value of the voltage signal and is used for outputting a characteristic voltage signal U 1 And U 2 Obtaining effective value U of voltage signal through HHT 1rms And U 2rms The method comprises the steps of carrying out a first treatment on the surface of the The storage battery internal resistance calculating module is used for calculating the internal resistance r and U of the storage battery according to the sampling resistance 1rms And U 2rms And calculating to obtain the internal resistance of the storage battery through ohm law.
3. The HHT-based battery internal resistance measurement system according to claim 2, wherein said sinusoidal ac signal injection module further comprises:
the sine function generation module is used for generating a sine alternating current signal;
a driving circuit for converting the sinusoidal alternating current signal into a current;
and the constant current power amplifier is used for stabilizing output current.
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| CN113533986A (en) * | 2021-07-16 | 2021-10-22 | 厦门爱维达科技工程有限公司 | VMD-Hilbert-based storage battery internal resistance measuring method and system |
| CN116148697B (en) * | 2023-04-04 | 2023-07-04 | 杭州华塑科技股份有限公司 | Battery internal resistance detection method and device for battery pack and storage medium |
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