CN210015215U - Testing device for dynamic electrochemical impedance spectrum of battery - Google Patents

Abstract

The application provides a testing device for battery dynamic electrochemical impedance spectroscopy. The testing device comprises a first controller, a dynamic working condition generator, an alternating current generator, an alternating voltage collector, a clock synchronization generator and a processor. And the clock synchronization generator is used for carrying out clock synchronization on the alternating current generator and the alternating voltage collector. The first controller controls the alternating current generator to send a test alternating current signal. The alternating voltage collector collects alternating voltage signals. And the processor calculates the dynamic electrochemical impedance spectrum of the battery to be tested according to the test alternating current signal and the alternating voltage signal. The testing device reduces errors caused by battery input and output nonlinearity and multi-factor coupling by setting the same dynamic working conditions for the battery to be tested and the reference battery and collecting alternating voltage signals between the battery to be tested and the reference battery, thereby improving the measurement accuracy of the dynamic electrochemical impedance spectrum of the battery to be tested.

Description

Testing device for dynamic electrochemical impedance spectrum of battery

Technical Field

The application relates to the field of battery testing, in particular to a testing device for a battery dynamic electrochemical impedance spectrum.

Background

The electrochemical impedance spectrum measurement of the battery is an important means for decomposing the impedance of the battery and acquiring the health state of the battery. With the popularization of the battery application field and the extension of the service life, the aging information of the battery is obtained through the electrochemical impedance spectrum, and the aging information becomes an important means for setting the continuous application working condition of the battery and detecting the utilization of the battery in a gradient manner.

The current measurement of the electrochemical impedance spectrum of the battery mainly focuses on the electrochemical impedance measurement under the static working condition of the battery. However, research has shown that even if the battery is in the same state of health and the same state of charge, the electrochemical impedance of the battery during charging is different from the electrochemical impedance of the battery during discharging, i.e. during the actual use of the battery, the dynamic electrochemical impedance spectrum is a more reliable means for reflecting the electrochemical impedance of the battery under the current working conditions. At present, the measurement of the dynamic electrochemical impedance spectrum of the battery still adopts the same method as the measurement of the traditional static electrochemical impedance spectrum, and the measurement precision is poorer.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a device for testing dynamic electrochemical impedance spectroscopy of a battery, which aims at the problem of poor measurement accuracy of the conventional dynamic chemical impedance spectroscopy of the battery.

A device for testing dynamic electrochemical impedance spectroscopy of a battery, comprising:

a first controller;

the dynamic working condition generator is electrically connected with the first controller, and the first controller controls the dynamic working condition generator to send a working condition signal;

the alternating current generator is electrically connected with the first controller, and the first controller controls the alternating current generator to generate a test current signal;

the alternating voltage collector is electrically connected with the first controller, and the first controller controls the alternating voltage collector to collect alternating voltage signals;

the clock synchronization generator is respectively electrically connected with the alternating current generator and the alternating voltage collector and is used for carrying out clock synchronization on the alternating current generator and the alternating voltage collector; and

and the processor is respectively electrically connected with the alternating current generator and the alternating voltage collector and is used for calculating the dynamic electrochemical impedance spectrum of the battery to be tested.

In one embodiment, the clock synchronization generator is electrically connected to the dynamic condition generator, and is configured to clock-synchronize the dynamic condition generator and the alternating current generator.

In one embodiment, the method further comprises the following steps:

and the second controller is electrically connected with the first controller and is used for sending dynamic working condition parameters or electrochemical impedance spectrum measurement parameters to the first controller.

In one embodiment, the method further comprises the following steps:

and the display is electrically connected with the processor and is used for displaying the dynamic electrochemical impedance spectrum obtained by measurement in real time.

In one embodiment, the clock synchronization generator comprises:

the first oscillator is respectively and electrically connected with the alternating current generator and the alternating voltage collector and is used for carrying out clock synchronization on the alternating current generator and the alternating voltage collector; and

and the second oscillator is respectively electrically connected with the dynamic working condition generator and the alternating current generator and is used for synchronizing the dynamic working condition generator and the alternating current generator.

In one embodiment, the processor comprises:

the acquisition unit is respectively electrically connected with the alternating current generator and the alternating voltage collector and is used for acquiring the test current signal and the alternating voltage signal; and

and the calculating unit is electrically connected with the acquiring unit and is used for calculating the dynamic electrochemical impedance spectrum of the battery to be measured.

In one embodiment, the test current signal has a frequency in the range of 0.1mHz to 1MHz and an amplitude in the range of 0.02C to 0.5C.

In one embodiment, when the electrochemical impedance of the battery to be measured needs to be measured, the dynamic condition generator applies the same charging current or discharging current to the battery to be measured and the reference battery respectively.

In one embodiment, the battery to be tested is one of a lead-acid battery, a nickel-cadmium battery or a lithium battery.

A device for testing dynamic electrochemical impedance spectroscopy of a battery, comprising:

a first controller;

the dynamic working condition generator is electrically connected with the first controller, and the first controller controls the dynamic working condition generator to send a working condition signal;

the battery simulator is electrically connected with the dynamic working condition generator, and the dynamic working condition generator applies charging current or discharging current to the battery simulator;

the alternating current generator is electrically connected with the first controller, and the first controller controls the alternating current generator to generate a test current signal;

the alternating voltage collector is electrically connected with the first controller, and the first controller controls the alternating voltage collector to collect alternating voltage signals;

the clock synchronization generator is respectively electrically connected with the alternating current generator and the alternating voltage collector and is used for carrying out clock synchronization on the alternating current generator and the alternating voltage collector; and

and the processor is respectively electrically connected with the alternating current generator and the alternating voltage collector and is used for calculating the dynamic electrochemical impedance spectrum of the battery to be tested.

The application provides a testing device for battery dynamic electrochemical impedance spectroscopy. The device for testing the dynamic electrochemical impedance spectrum of the battery comprises a first controller, a dynamic working condition generator, an alternating current generator, an alternating voltage collector, a clock synchronous generator and a processor. The first controller controls the dynamic condition generator to apply dynamic conditions. The clock synchronization generator is respectively electrically connected with the alternating current generator and the alternating voltage collector and is used for carrying out clock synchronization on the alternating current generator and the alternating voltage collector. The first controller controls the alternating current generator to send a test alternating current signal. The first controller controls the alternating voltage collector to collect alternating voltage signals. And the processor calculates the dynamic electrochemical impedance spectrum of the battery to be tested according to the test alternating current signal and the alternating voltage signal. The testing device can reduce errors caused by battery input and output nonlinearity and multi-factor coupling by setting the same dynamic working conditions for the battery to be tested and the reference battery and collecting alternating voltage signals between the battery to be tested and the reference battery, thereby improving the measurement accuracy of the dynamic electrochemical impedance spectrum of the battery to be tested.

Drawings

FIG. 1 is a block diagram of a device for testing dynamic electrochemical impedance spectroscopy of a battery according to an embodiment of the present application;

FIG. 2 is a block diagram of a device for testing dynamic electrochemical impedance spectroscopy of a battery according to an embodiment of the present application;

FIG. 3 is a block diagram of a device for testing dynamic electrochemical impedance spectroscopy of a battery according to an embodiment of the present application;

FIG. 4 is a graph illustrating the results of a conventional dynamic electrochemical impedance spectroscopy test provided in accordance with an embodiment of the present application;

fig. 5 is a graph of the test results of dynamic electrochemical impedance spectroscopy provided in one embodiment of the present application.

Description of the main element reference numerals

Testing device 100 for dynamic electrochemical impedance spectroscopy of battery

Battery under test 10

First electrode 11

Second electrode 12

Reference battery 20

Third electrode 21

Fourth electrode 22

Dynamic condition generator 31

Alternating current generator 32

Alternating voltage collector 33

First controller 41

Clock synchronization generator 42

First oscillator 421

Second oscillator 422

Processor 43

Acquisition unit 431

Calculation unit 432

Second controller 51

Display 52

Battery simulator 60

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, in one embodiment, a device 100 for testing dynamic electrochemical impedance spectroscopy of a battery is provided. The device 100 for testing the dynamic electrochemical impedance spectrum of the battery comprises a first controller 41, a dynamic condition generator 31, an alternating current generator 32, an alternating voltage collector 33, a clock synchronization generator 42 and a processor 43.

The dynamic condition generator 31, the alternating current generator 32 and the alternating voltage collector 33 are electrically connected to the first controller 41, respectively. The first controller 41 controls the dynamic condition generator 31 to apply the dynamic condition. The clock synchronization generator 42 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively, and is configured to perform clock synchronization on the alternating current generator 32 and the alternating voltage collector 33. The first controller 41 controls the alternating current generator 32 to send a test alternating current signal. The frequency range of the test current signal is 0.1Hz-1MHz, and the amplitude of the test current signal is 0.02C-0.5C. The first controller 41 controls the alternating voltage collector 33 to collect an alternating voltage signal. The processor 43 calculates the dynamic electrochemical impedance spectrum of the battery under test from the test ac signal and the ac voltage signal.

The power battery can be one of a lead-acid storage battery, a nickel-cadmium storage battery or a lithium storage battery. When the electrochemical impedance of the battery 10 to be measured needs to be measured, the dynamic condition generator 31 is electrically connected to the battery 10 to be measured and the reference battery 20, respectively, and is configured to set the same dynamic condition to the battery 10 to be measured and the reference battery 20. The dynamic operating condition includes a charging current or a discharging current. The alternating current generator 32 is electrically connected to the battery 10 to be tested, and is configured to provide a test alternating current signal to the battery 10 to be tested. The battery 10 to be tested has a first electrode 11 and a second electrode 12. The reference cell has a third electrode 21 and a fourth electrode 22. The alternating voltage collector 33 is electrically connected to the first electrode 11 and the third electrode 21, and is configured to collect an alternating voltage signal between the battery 10 to be tested and the reference battery 20.

Specifically, the dynamic condition generator 31 is connected to the second electrode 12 and the fourth electrode 22 through a first dynamic condition output harness. The dynamic condition generator 31 is connected with the first electrode 11 through a second dynamic condition output wire harness. The dynamic condition generator 31 is connected with the third electrode 13 through a third dynamic condition output harness. During operation, the dynamic condition generator 31 applies the same dynamic condition to the battery under test 10 and the reference battery 20. The dynamic working conditions comprise charging working conditions, discharging working conditions and any set dynamic working conditions. In order to realize the same dynamic working condition, the current direction on the first dynamic output wire harness is opposite to the current direction on the second dynamic output wire harness, and the current direction on the second dynamic output wire harness is the same as the current direction on the third dynamic output wire harness. And the current value on the second dynamic output wire harness is equal to the current value on the third dynamic output wire harness, and the current value on the first dynamic output wire harness is twice of the current value on the second dynamic output wire harness. As an embodiment, the dynamic condition generator 31 applies a 1C charging current to the battery under test 10 and the reference battery 20, respectively. In order to realize the dynamic working condition, the current on the first dynamic output line is 2C, the direction flows from the battery to the dynamic working condition generator 31, the current of the second dynamic output harness and the current of the third dynamic output harness are both 1C, and the direction flows from the dynamic working condition generator 31 to the battery.

The alternating current generator 32 is connected to the first electrode 11 via a first alternating current output harness. The alternating current generator 32 is connected to the third electrode 12 via a second alternating current output harness. The alternating current generator 32 is used to apply an exciting alternating current of an electrochemical impedance spectrum to the battery 10 under test. I.e. the alternating current generator 32 is adapted to provide a test current signal to the battery under test 10.

The clock synchronization generator 42 first clock-synchronizes the ac current generator 32 and the alternating voltage collector 33. To ensure that the output and input signals of different components have the same clock. When the test apparatus 100 is in operation, the first controller 41 controls the dynamic condition generator 31 to simultaneously apply the same dynamic condition to the battery under test 10 and the reference battery 20. When the battery 10 to be tested operates to the target operating point under the dynamic operating condition, the first controller 41 controls the alternating current generator 32 to excite the alternating current corresponding to the alternating impedance to the battery 10 to be tested. And exciting the alternating current corresponding to the alternating impedance into the test current signal. Meanwhile, the first controller 41 collects the potential difference between the battery 10 to be measured and the reference battery 20 by controlling the alternating voltage collector 33. The potential difference is used as an alternating voltage model. The processor 43 obtains the dynamic electrochemical impedance spectrum of the tested electric core through operation by obtaining the current excitation and the potential difference.

The reference cell 20 has the same external characteristics as the cell 10 to be tested. The same external characteristic is that the voltage output characteristic or the current output characteristic of the reference battery 20 is the same as the voltage output characteristic or the current output characteristic of the battery 10 to be tested under the same current or voltage input condition. The reference battery 20 includes a real battery having the same external characteristics as the battery 10 to be tested, for example, the reference battery 20 is a real battery having the same model and batch as the battery 10 to be tested. The reference battery 20 further includes a dummy battery having the same external characteristics as the battery 10 to be tested. For example, the battery simulator 60 capable of simulating the output characteristics of the battery simulates a virtual battery having the same response characteristics as the battery 10 to be tested by measuring and recording the response characteristics under the dynamic working conditions of the battery. The reference battery 20 and the battery 10 to be tested are connected together on a single electrode through a dynamic working condition current output wiring harness. The single electrode connection includes a positive electrode connection with a positive electrode and also includes a negative electrode connection with a negative electrode. As an embodiment, the battery 10 to be tested and the reference battery 20 are connected together through a dynamic working condition current output harness on the negative electrode, that is, the battery negative electrode of the battery 10 to be tested is connected with the negative electrode of the reference battery 20.

In this embodiment, the testing device 100 sets the same dynamic condition to the battery 10 to be tested and the reference battery 20 and collects the ac voltage signal between the battery 10 to be tested and the reference battery 20, so as to reduce the error caused by battery input/output nonlinearity and multi-factor coupling, and further improve the measurement accuracy of the dynamic electrochemical impedance spectrum of the battery 10 to be tested.

Referring to fig. 2, in one embodiment, the apparatus 100 for testing dynamic electrochemical impedance spectroscopy of a battery further includes a second controller 51 and a display 52.

The second controller 51 is electrically connected to the first controller 41, and is configured to send the dynamic condition parameter or the electrochemical impedance spectroscopy measurement parameter to the first controller 41. The display 52 is electrically connected to the processor 43 for displaying the measured dynamic electrochemical impedance spectrum in real time. The second controller 51 may be a microprocessor or a single chip microcomputer. The display 52 may be a computer or other device with a display screen.

In this embodiment, an operator may set a working condition or an electrochemical impedance spectrum measurement parameter at will through the second controller 52, so as to measure an electrochemical impedance spectrum under any working condition and any electrochemical impedance excitation signal, and display the electrochemical impedance spectrum on the display, so that the operator can view the electrochemical impedance spectrum.

In one embodiment, the clock synchronization generator 42 includes: a first oscillator 421 and a second oscillator 422.

The first oscillator 421 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively. The first oscillator 421 is used to realize clock synchronization between the alternating current generator 32 and the alternating voltage collector 33. The second oscillator 422 is electrically connected to the dynamic condition generator 31 and the alternating current generator 32, respectively, and is configured to clock the dynamic condition generator 31 and the alternating current generator 32. Since the measured electrochemical impedance spectrum is a vector. The electrochemical impedance spectrum has an amplitude and a phase. In order to accurately measure the amplitude and the phase, the test ac signal and the ac voltage signal need to be strictly synchronized, so the synchronization error of the first oscillator 421 may be less than 1 microsecond. In order to ensure that the test current signal is applied in one operating condition, it is ensured that the dynamic condition generator 31 and the alternating current generator 32 are clocked. In order to save cost and not influence measurement accuracy, the synchronization error of the second oscillator 422 is only less than 0.1 second.

Referring to fig. 3, in one embodiment of the present application, a device 100 for testing dynamic electrochemical impedance spectroscopy of a battery is provided. The test apparatus 100 includes: a first controller 41, a dynamic condition generator 31, a battery simulator 60, an alternating current generator 32, an alternating voltage collector 33, a clock synchronization generator 42 and a processor 43.

The dynamic condition generator 31 is electrically connected to the first controller 41, and the first controller 41 controls the dynamic condition generator 31 to send a condition signal. The battery simulator 60 is electrically connected to the dynamic condition generator 31, and the dynamic condition generator 31 applies a charging current or a discharging current to the battery simulator 60. The alternating current generator 32 is electrically connected to the first controller 41, and the first controller 41 controls the alternating current generator 32 to generate a test current signal. The alternating voltage collector 33 is electrically connected with the first controller 41, and the first controller 41 controls the alternating voltage collector 33 to collect an alternating voltage signal. The clock synchronization generator 42 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively. The clock synchronization generator 42 is used to clock synchronize the alternating current generator 32 and the alternating voltage collector 33. The processor 43 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively. The processor 43 is used to calculate the dynamic electrochemical impedance spectrum of the battery 10 under test.

The first controller 41, the dynamic condition generator 31, the alternating current generator 32, the alternating voltage collector 33, the clock synchronization generator 42, and the processor 43 in this embodiment are the same as the first controller 41, the dynamic condition generator 31, the alternating current generator 32, the alternating voltage collector 33, the clock synchronization generator 42, and the processor 43 in the above embodiments in structure and connection relationship, and are not described herein again.

The battery simulator 60 simulates a virtual battery having the same response characteristics as the battery 10 to be tested by measuring and recording the response characteristics under the dynamic working condition of the battery. The same response characteristic is that the voltage or current output characteristic of the virtual battery is the same as the voltage or current output characteristic of the battery 10 to be tested under the same current or voltage input condition.

The processor 43 includes an acquisition unit 431 and a calculation unit 432. The obtaining unit 431 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively, and is configured to obtain the test current signal and the alternating voltage signal. The calculating unit 432 is electrically connected to the obtaining unit 431, and is configured to calculate a dynamic electrochemical impedance spectrum of the battery 10 under test.

In this embodiment, the battery simulator 60 simulates a virtual battery having the same response characteristics as the battery 10 to be tested by measuring and recording the response characteristics under the dynamic condition of the battery. The test device 100 sets the same dynamic condition to the battery 10 to be tested and the virtual battery. In addition, the testing device 100 collects the alternating voltage signal between the battery 10 to be tested and the virtual battery, so that errors caused by battery input and output nonlinearity and multi-factor coupling can be reduced, and the measurement accuracy of the dynamic electrochemical impedance spectrum of the battery 10 to be tested is improved.

Referring to fig. 4 and 5, in one embodiment, the clock synchronization generator 42 first performs clock synchronization on the dynamic condition generator 31, the ac current generator 32 and the ac voltage collector 33 to ensure that the output and input signals of different components have the same clock. When the test apparatus 100 is in operation, the dynamic condition generator 31 applies a charging current of 1C to the battery under test 10 and the reference battery 20 at the same time. When the battery 10 to be tested operates to a target state under a dynamic working condition, the alternating current generator 32 applies alternating current excitation of 1Hz and 0.2C to the battery 10 to be tested. Meanwhile, the first controller 41 controls the alternating voltage collector 33 to collect the potential difference between the positive electrodes of the battery to be measured 10 and the reference battery 20, and feeds the potential difference back to the processor 43. The processor 43 obtains the dynamic electrochemical impedance spectrum of the tested electric core by analyzing and calculating the test current signal sent by the alternating current generator 32 and the voltage response of the alternating voltage collector 33. The calculation formula is as follows:

wherein said Z represents electrochemical impedance; v_mRepresenting the magnitude of the potential difference; w' represents the frequency of the potential difference;

a phase representing a potential difference; i is_mAn amplitude representative of the test AC signal; w represents the frequency of the test ac signal;

representing the phase of the test ac signal.

The display 52 implements a dynamic electrochemical impedance spectrum calculated by the processor 43, which is shown in fig. 5. The dynamic electrochemical impedance spectrogram 4 obtained by the traditional dynamic testing method under the same parameters is shown. Through comparison, the test result of the dynamic electrochemical impedance spectroscopy of the battery provided by the application is more stable, and the repeatability is better.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A device (100) for testing the dynamic electrochemical impedance spectroscopy of a battery, comprising:

a first controller (41);

the dynamic working condition generator (31) is electrically connected with the first controller (41), and the first controller (41) controls the dynamic working condition generator (31) to send a working condition signal;

an alternating current generator (32) electrically connected to the first controller (41), the first controller (41) controlling the alternating current generator (32) to generate a test current signal;

the alternating voltage collector (33) is electrically connected with the first controller (41), and the first controller (41) controls the alternating voltage collector (33) to collect alternating voltage signals;

a clock synchronization generator (42) electrically connected to the alternating current generator (32) and the alternating voltage collector (33), respectively, for clock synchronizing the alternating current generator (32) and the alternating voltage collector (33); and

and the processor (43) is respectively electrically connected with the alternating current generator (32) and the alternating voltage collector (33) and is used for calculating the dynamic electrochemical impedance spectrum of the battery (10) to be tested.

2. The testing device (100) according to claim 1, wherein the clock synchronization generator (42) is electrically connected to the dynamic condition generator (31) for clock synchronization of the dynamic condition generator (31) and the alternating current generator (32).

3. The testing device (100) of claim 1, further comprising:

and the second controller (51) is electrically connected with the first controller (41) and is used for sending dynamic working condition parameters or electrochemical impedance spectrum measurement parameters to the first controller (41).

4. The testing device (100) of claim 3, further comprising:

and the display (52) is electrically connected with the processor (43) and is used for displaying the measured dynamic electrochemical impedance spectrum in real time.

5. The test apparatus (100) of claim 1, wherein the clock synchronization generator (42) comprises:

a first oscillator (421) electrically connected to the alternating current generator (32) and the alternating voltage collector (33), respectively, for clock-synchronizing the alternating current generator (32) and the alternating voltage collector (33); and

and the second oscillator (422) is respectively electrically connected with the dynamic working condition generator (31) and the alternating current generator (32) and is used for synchronizing the dynamic working condition generator (31) and the alternating current generator (32) in a clock mode.

6. The testing device (100) of claim 1, wherein the processor (43) comprises:

an acquiring unit (431) electrically connected with the alternating current generator (32) and the alternating voltage collector (33) respectively and used for acquiring the test current signal and the alternating voltage signal; and

and the calculating unit (432) is electrically connected with the acquiring unit (431) and is used for calculating the dynamic electrochemical impedance spectrum of the battery (10) to be tested.

7. The test device (100) of claim 1, wherein the test current signal has a frequency in the range of 0.1mHz-1mHz and an amplitude in the range of 0.02C-0.5C.

8. The testing device (100) according to claim 1, wherein the dynamic condition generator (31) applies the same charging current or discharging current to the battery under test (10) and the reference battery (20), respectively, when it is desired to measure the electrochemical impedance of the battery under test (10).

9. The testing device (100) according to claim 8, wherein the battery (10) under test is one of a lead-acid battery, a nickel-cadmium battery, or a lithium battery.

10. A device (100) for testing the dynamic electrochemical impedance spectroscopy of a battery, comprising:

a first controller (41);

the dynamic working condition generator (31) is electrically connected with the first controller (41), and the first controller (41) controls the dynamic working condition generator (31) to send a working condition signal;

a battery simulator (60) electrically connected with the dynamic condition generator (31), wherein the dynamic condition generator (31) applies charging current or discharging current to the battery simulator (60);

an alternating current generator (32) electrically connected to the first controller (41), the first controller (41) controlling the alternating current generator (32) to generate a test current signal;

the alternating voltage collector (33) is electrically connected with the first controller (41), and the first controller (41) controls the alternating voltage collector (33) to collect alternating voltage signals;

a clock synchronization generator (42) electrically connected to the alternating current generator (32) and the alternating voltage collector (33), respectively, for clock synchronizing the alternating current generator (32) and the alternating voltage collector (33); and

and the processor (43) is respectively electrically connected with the alternating current generator (32) and the alternating voltage collector (33) and is used for calculating the dynamic electrochemical impedance spectrum of the battery (10) to be tested.

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