Battery dynamic electrochemical impedance spectroscopy test device

Abstract

The present application provides a testing device for the dynamic electrochemical impedance spectrum of a battery. The testing device includes a first controller, a dynamic operating condition generator, an alternating current generator, an alternating voltage collector, a clock synchronization generator and a processor. The clock synchronization generator performs clock synchronization on the alternating current generator and the alternating voltage collector. The first controller controls the alternating current generator to send a test AC signal. The alternating voltage collector collects an AC voltage signal. The processor calculates the dynamic electrochemical impedance spectrum of the battery to be tested based on the test AC signal and the AC voltage signal. The testing device reduces the error caused by the nonlinearity of the battery input and output and the coupling of multiple factors by setting the same dynamic operating condition to the battery to be tested and the reference battery and collecting the AC voltage signal 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

Technical Field

[0001] The present application relates to the field of battery testing, and in particular to a testing device for dynamic electrochemical impedance spectroscopy of a battery. Background Art

[0002] Battery electrochemical impedance spectroscopy measurement is an important means to decompose battery impedance and obtain battery health status. With the promotion of battery application fields and the extension of service life, obtaining battery aging information through electrochemical impedance spectroscopy has become an important means of setting battery continued application conditions and cascade utilization detection.

[0003] At present, the measurement of battery electrochemical impedance spectrum mainly focuses on the electrochemical impedance measurement under static battery conditions. However, studies have shown that even if the battery is in the same health state and the same state of charge, the electrochemical impedance of the battery during charging is different from the electrochemical impedance during discharging. That is, in the actual use of the battery, the dynamic electrochemical impedance spectrum is a more reliable means to reflect 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 uses the same method as the traditional static electrochemical impedance spectrum measurement, and the measurement accuracy is poor. Summary of the invention

[0004] Based on this, it is necessary to provide a testing device for battery dynamic electrochemical impedance spectroscopy to address the problem of poor measurement accuracy of existing battery dynamic chemical impedance spectroscopy.

[0005] A battery dynamic electrochemical impedance spectroscopy testing device, comprising:

[0006] a first controller;

[0007] A dynamic operating condition generator is electrically connected to the first controller, and the first controller controls the dynamic operating condition generator to send an operating condition signal;

[0008] an alternating current generator, electrically connected to the first controller, wherein the first controller controls the alternating current generator to generate a test current signal;

[0009] An alternating voltage collector is electrically connected to the first controller, and the first controller controls the alternating voltage collector to collect an alternating voltage signal;

[0010] a clock synchronization generator, electrically connected to the alternating current generator and the alternating voltage collector, respectively, and used for performing clock synchronization between the alternating current generator and the alternating voltage collector; and

[0011] The processor is electrically connected to the alternating current generator and the alternating voltage collector respectively, and is used to calculate the dynamic electrochemical impedance spectrum of the battery to be tested.

[0012] In one of the embodiments, the clock synchronization generator is electrically connected to the dynamic operating condition generator for clock synchronization of the dynamic operating condition generator and the alternating current generator.

[0013] In one embodiment, it also includes:

[0014] The second controller is electrically connected to the first controller and is used to send dynamic operating parameters or electrochemical impedance spectroscopy measurement parameters to the first controller.

[0015] In one embodiment, it also includes:

[0016] The display is electrically connected to the processor and is used to display the measured dynamic electrochemical impedance spectrum in real time.

[0017] In one embodiment, the clock synchronization generator comprises:

[0018] a first oscillator, electrically connected to the alternating current generator and the alternating voltage collector, respectively, and used for performing clock synchronization between the alternating current generator and the alternating voltage collector; and

[0019] The second oscillator is electrically connected to the dynamic working condition generator and the alternating current generator respectively, and is used for clock synchronization of the dynamic working condition generator and the alternating current generator.

[0020] In one embodiment, the processor comprises:

[0021] an acquisition unit, electrically connected to the alternating current generator and the alternating voltage collector, respectively, and configured to acquire the test current signal and the alternating voltage signal; and

[0022] The calculation unit is electrically connected to the acquisition unit and is used to calculate the dynamic electrochemical impedance spectrum of the battery to be tested.

[0023] In one embodiment, the frequency range of the test current signal is 0.1 mHz-1 MHz, and the amplitude of the test current signal is 0.02C-0.5C.

[0024] In one embodiment, when it is necessary to measure the electrochemical impedance of the battery to be tested, the dynamic operating condition generator applies the same charging current or discharging current to the battery to be tested and the reference battery respectively.

[0025] In one embodiment, the battery to be tested is a lead-acid battery, a nickel-cadmium battery or a lithium battery.

[0026] A battery dynamic electrochemical impedance spectroscopy testing device, comprising:

[0027] a first controller;

[0028] A dynamic operating condition generator is electrically connected to the first controller, and the first controller controls the dynamic operating condition generator to send an operating condition signal;

[0029] A battery simulator, electrically connected to the dynamic operating condition generator, the dynamic operating condition generator applies a charging current or a discharging current to the battery simulator;

[0030] an alternating current generator, electrically connected to the first controller, wherein the first controller controls the alternating current generator to generate a test current signal;

[0031] An alternating voltage collector is electrically connected to the first controller, and the first controller controls the alternating voltage collector to collect an alternating voltage signal;

[0032] a clock synchronization generator, electrically connected to the alternating current generator and the alternating voltage collector, respectively, and used for performing clock synchronization between the alternating current generator and the alternating voltage collector; and

[0033] The processor is electrically connected to the alternating current generator and the alternating voltage collector respectively, and is used to calculate the dynamic electrochemical impedance spectrum of the battery to be tested.

[0034] The present application provides a testing device for a dynamic electrochemical impedance spectrum of a battery. The testing device for a dynamic electrochemical impedance spectrum of a battery includes a first controller, a dynamic operating condition generator, an alternating current generator, an alternating voltage collector, a clock synchronization generator and a processor. The first controller controls the dynamic operating condition generator to apply a dynamic operating condition. The clock synchronization generator is electrically connected to the alternating current generator and the alternating voltage collector, respectively, and is used to perform clock synchronization between the alternating current generator and the alternating voltage collector. The first controller controls the alternating current generator to send a test AC signal. The first controller controls the alternating voltage collector to collect an AC voltage signal. The processor calculates the dynamic electrochemical impedance spectrum of the battery to be tested based on the test AC signal and the AC voltage signal. The testing device can reduce the error caused by the nonlinearity of the battery input and output and the multi-factor coupling by setting the same dynamic operating condition to the battery to be tested and the reference battery and collecting the AC voltage signal 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A structural diagram of a battery dynamic electrochemical impedance spectroscopy testing device provided in one embodiment of the present application;

[0036] Figure 2A structural diagram of a battery dynamic electrochemical impedance spectroscopy testing device provided in one embodiment of the present application;

[0037] Figure 3 A structural diagram of a battery dynamic electrochemical impedance spectroscopy testing device provided in one embodiment of the present application;

[0038] Figure 4 A graph showing the test results of a conventional dynamic electrochemical impedance spectroscopy provided in one embodiment of the present application;

[0039] Figure 5 A graph showing the test results of a dynamic electrochemical impedance spectroscopy provided in one embodiment of the present application.

[0040] Description of main component reference numbers

[0041] Battery dynamic electrochemical impedance spectroscopy test device 100

[0042] Battery under test 10

[0043] The first electrode 11

[0044] The second electrode 12

[0045] Reference battery 20

[0046] The third electrode 21

[0047] Fourth electrode 22

[0048] Dynamic Condition Generator 31

[0049] Alternating current generator 32

[0050] Alternating voltage collector 33

[0051] First controller 41

[0052] Clock synchronization generator 42

[0053] First oscillator 421

[0054] Second oscillator 422

[0055] Processor 43

[0056] Acquisition unit 431

[0057] Computing unit 432

[0058] Second controller 51

[0059] Display 52

[0060] Battery Simulator 60 DETAILED DESCRIPTION

[0061] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0062] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0064] See also Figure 1 In one embodiment of the present application, a battery dynamic electrochemical impedance spectroscopy testing device 100 is provided. The battery dynamic electrochemical impedance spectroscopy testing device 100 includes a first controller 41, a dynamic operating condition generator 31, an alternating current generator 32, an alternating voltage collector 33, a clock synchronization generator 42 and a processor 43.

[0065] The dynamic working 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 working condition generator 31 to apply the dynamic working condition. The clock synchronization generator 42 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively, for clock synchronization of 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 AC 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 the AC voltage signal. The processor 43 calculates the dynamic electrochemical impedance spectrum of the battery to be tested based on the test AC signal and the AC voltage signal.

[0066] The power battery can be one of a lead-acid battery, a nickel-cadmium battery or a lithium battery. When it is necessary to measure the electrochemical impedance of the battery to be tested 10, the dynamic operating condition generator 31 is electrically connected to the battery to be tested 10 and the reference battery 20, respectively, for setting the same dynamic operating condition for the battery to be tested 10 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 to be tested 10, for providing a test AC signal to the battery to be tested 10. The battery to be tested 10 has a first electrode 11 and a second electrode 12. The reference battery 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, respectively, for collecting the AC voltage signal between the battery to be tested 10 and the reference battery 20.

[0067] Specifically, the dynamic condition generator 31 is connected to the second electrode 12 and the fourth electrode 22 through the first dynamic condition output harness. The dynamic condition generator 31 is connected to the first electrode 11 through the second dynamic condition output harness. The dynamic condition generator 31 is connected to the third electrode 13 through the third dynamic condition output harness. During operation, the dynamic condition generator 31 applies the same dynamic condition to the battery to be tested 10 and the reference battery 20. The dynamic condition includes a charging condition, a discharging condition, and an arbitrarily set dynamic condition. To achieve the same dynamic condition, the current direction on the first dynamic output harness is opposite to the current direction on the second dynamic output harness, and the current direction on the second dynamic output harness is the same as the current direction on the third dynamic output harness. In addition, the current value on the second dynamic output harness is equal to the current value on the third dynamic output harness, and the current value on the first dynamic output line is twice the current value on the second dynamic output harness. As an embodiment, the dynamic operating condition generator 31 applies a 1C charging current to the battery under test 10 and the reference battery 20. To achieve this dynamic operating condition, the current on the first dynamic output line is 2C, flowing from the battery to the dynamic operating condition generator 31, and the current of the second dynamic output line and the current of the third dynamic output line are both 1C, flowing from the dynamic operating condition generator 31 to the battery.

[0068] The alternating current generator 32 is connected to the first electrode 11 through a first alternating current output wire bundle. The alternating current generator 32 is connected to the third electrode 12 through a second alternating current output wire bundle. The alternating current generator 32 is used to apply the excitation alternating current of the electrochemical impedance spectroscopy to the battery under test 10. That is, the alternating current generator 32 is used to provide a test current signal to the battery under test 10.

[0069] The clock synchronization generator 42 first performs clock synchronization on the alternating 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 device 100 is running, the first controller 41 controls the dynamic working condition generator 31 to apply the same dynamic working condition to the battery to be tested 10 and the reference battery 20 at the same time. When the battery to be tested 10 runs to the target working condition point under the dynamic working condition, the first controller 41 controls the alternating current generator 32 to apply the alternating current excitation corresponding to the alternating current impedance to the battery to be tested 10. The alternating current excitation corresponding to the alternating current impedance is the test current signal. At the same time, the first controller 41 collects the potential difference between the battery to be tested 10 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 battery to be tested by obtaining the current excitation and the potential difference, and then obtains the dynamic electrochemical impedance spectrum of the battery to be tested through calculation.

[0070] The reference battery 20 has the same external characteristics as the battery 10 to be tested. The same external characteristics refer to that under the same current or voltage input conditions, the voltage output characteristics or current output characteristics of the reference battery 20 are the same as the voltage output characteristics or current output characteristics of the battery 10 to be tested. The reference battery 20 includes both real batteries with the same external characteristics as the battery 10 to be tested, for example, the reference battery 20 is a real battery of the same model and batch as the battery 10 to be tested. The reference battery 20 also includes virtual batteries with the same external characteristics as the battery 10 to be tested. For example, a battery simulator 60 that can simulate battery output characteristics simulates a virtual battery with the same response characteristics as the battery 10 to be tested by measuring and recording the response characteristics of the battery under dynamic working conditions. 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 harness. The single electrode connection includes positive electrode to positive electrode connection and negative electrode to negative electrode connection. As an embodiment, the battery under test 10 and the reference battery 20 are connected together at the negative pole through a dynamic operating current output harness, that is, the negative pole of the battery under test 10 is connected to the negative pole of the reference battery 20.

[0071] In this embodiment, the testing device 100 can reduce the error caused by battery input-output nonlinearity and multi-factor coupling by setting the same dynamic operating conditions to the battery to be tested 10 and the reference battery 20 and collecting the AC voltage signal between the battery to be tested 10 and the reference battery 20, thereby improving the measurement accuracy of the dynamic electrochemical impedance spectrum of the battery to be tested 10.

[0072] See also Figure 2In one embodiment, the battery dynamic electrochemical impedance spectroscopy testing device 100 further includes a second controller 51 and a display 52 .

[0073] The second controller 51 is electrically connected to the first controller 41, and is used to send dynamic operating parameters or electrochemical impedance spectrum measurement parameters to the first controller 41. The display 52 is electrically connected to the processor 43, and is used to display the measured dynamic electrochemical impedance spectrum in real time. The second controller 51 can be a microprocessor or a single-chip microcomputer. The display 52 can be a computer or other device with a display screen.

[0074] In this embodiment, the operator can arbitrarily set the working condition or electrochemical impedance spectrum measurement parameters through the second controller 52, thereby measuring the electrochemical impedance spectrum under any working condition and any electrochemical impedance excitation signal, and displaying the electrochemical impedance spectrum on the display for the operator to watch.

[0075] In one embodiment, the clock synchronization generator 42 includes: a first oscillator 421 and a second oscillator 422 .

[0076] 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 achieve 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 used to synchronize the clocks of 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 can be less than 1 microsecond. In order to ensure that the test current signal is applied under one working condition, it is necessary to ensure that the clocks of the dynamic condition generator 31 and the alternating current generator 32 are synchronized. In order to save costs without affecting the measurement accuracy, the synchronization error of the second oscillator 422 is less than 0.1 seconds.

[0077] See also Figure 3 In one embodiment of the present application, a battery dynamic electrochemical impedance spectroscopy test device 100 is provided. The test device 100 includes: a first controller 41, a dynamic operating 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.

[0078] The dynamic operating condition generator 31 is electrically connected to the first controller 41, and the first controller 41 controls the dynamic operating condition generator 31 to send an operating condition signal. The battery simulator 60 is electrically connected to the dynamic operating condition generator 31, and the dynamic operating 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 to 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 synchronize the clocks of 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 to be tested.

[0079] The first controller 41, the dynamic operating 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 have the same structure and connection relationship as the first controller 41, the dynamic operating 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-mentioned embodiments, and are not repeated here.

[0080] The battery simulator 60 simulates a virtual battery having the same response characteristics as the battery to be tested 10 by measuring and recording the response characteristics of the battery under dynamic working conditions. The same response characteristics mean that under the same current or voltage input conditions, the voltage or current output characteristics of the virtual battery are the same as the voltage or current output characteristics of the battery to be tested 10.

[0081] The processor 43 includes an acquisition unit 431 and a calculation unit 432. The acquisition unit 431 is electrically connected to the alternating current generator 32 and the alternating voltage collector 33, respectively, for acquiring the test current signal and the alternating voltage signal. The calculation unit 432 is electrically connected to the acquisition unit 431, for calculating the dynamic electrochemical impedance spectrum of the battery 10 to be tested.

[0082] In this embodiment, the battery simulator 60 simulates a virtual battery having the same response characteristics as the battery to be tested 10 by measuring and recording the response characteristics of the battery under dynamic working conditions. The test device 100 sets the same dynamic working conditions for the battery to be tested 10 and the virtual battery. In addition, the test device 100 collects the AC voltage signal between the battery to be tested 10 and the virtual battery, which can reduce the error caused by the nonlinearity of the battery input and output and the coupling of multiple factors, thereby improving the measurement accuracy of the dynamic electrochemical impedance spectrum of the battery to be tested 10.

[0083] See also Figure 4 and Figure 5 In one embodiment, the clock synchronization generator 42 first performs clock synchronization on the dynamic working condition generator 31, the alternating 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 device 100 is running, the dynamic working 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 under test 10 runs to the target state under the dynamic working condition, the alternating current generator 32 applies an alternating current excitation of 1Hz and 0.2C to the battery under test 10. At the same time, the first controller 41 controls the alternating voltage collector 33 to collect the potential difference between the positive electrodes of the battery under test 10 and the reference battery 20, and feeds it back to the processor 43. The processor 43 obtains the dynamic electrochemical impedance spectrum of the battery under test by analyzing and calculating the test current signal emitted by the alternating current generator 32 and the voltage response of the alternating voltage collector 33. The calculation formula is:

[0084]

[0085] Wherein, Z represents electrochemical impedance; V m represents the amplitude of the potential difference; w' represents the frequency of the potential difference; Represents the phase of the potential difference; I m represents the amplitude of the test AC signal; w represents the frequency of the test AC signal; Represents the phase of the test AC signal.

[0086] The display 52 is implemented to display the dynamic electrochemical impedance spectrum calculated by the processor 43. The dynamic electrochemical impedance spectrum is as follows: Figure 5 The dynamic electrochemical impedance spectrum obtained by the traditional dynamic test method under the same parameters Figure 4 By comparison, it can be seen that the battery dynamic electrochemical impedance spectroscopy test results provided by the present application are more stable and have better repeatability.

[0087] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery dynamic electrochemical impedance spectroscopy testing device (100), characterized in that: being electrically connected to a battery to be tested (10) and a reference battery (20), respectively, the reference battery (20) having the same external characteristics as the battery to be tested (10), wherein the same external characteristics mean that under the same current or voltage input conditions, the voltage output characteristic or current output characteristic of the reference battery (20) is the same as the voltage output characteristic or current output characteristic of the battery to be tested (10); The testing device (100) comprises: A first controller (41); A dynamic operating condition generator (31) is electrically connected to the first controller (41), the dynamic operating condition generator (31) is electrically connected to the battery to be tested (10) and the reference battery (20), respectively, and the first controller (41) controls the dynamic operating condition generator (31) to send operating condition signals to the battery to be tested (10) and the reference battery (20), respectively; an alternating current generator (32) electrically connected to the first controller (41) and the battery to be tested (10), wherein the first controller (41) controls the alternating current generator (32) to generate a test current signal and provides the test current signal to the battery to be tested (10); an alternating voltage collector (33) electrically connected to the first controller (41), the alternating voltage collector (33) being electrically connected to the battery to be tested (10) and the reference battery (20) respectively, and the first controller (41) controlling the alternating voltage collector (33) to collect an alternating voltage signal between the battery to be tested (10) and the reference battery (20); a clock synchronization generator (42), electrically connected to the alternating current generator (32) and the alternating voltage collector (33), respectively, and used for performing clock synchronization on the alternating current generator (32) and the alternating voltage collector (33); and A processor (43) is electrically connected to the alternating current generator (32) and the alternating voltage collector (33) respectively, and is used to calculate the dynamic electrochemical impedance spectrum of the battery to be tested (10); The calculation formula is: Z=V m Sin(w’t+φ’) / I m Sin(wt+φ) Where Z represents electrochemical impedance; V m represents the amplitude of the potential difference; w' represents the frequency of the potential difference; φ' represents the phase of the potential difference; I m represents the amplitude of the test AC signal; w represents the frequency of the test AC signal; φ represents the phase of the test AC signal.

2. The testing device (100) according to claim 1, characterized in that: The clock synchronization generator (42) is electrically connected to the dynamic operating condition generator (31) and is used to perform clock synchronization between the dynamic operating condition generator (31) and the alternating current generator (32).

3. The testing device (100) according to claim 1, characterized in that: Also includes: The second controller (51) is electrically connected to the first controller (41) and is used to send dynamic operating parameters or electrochemical impedance spectroscopy measurement parameters to the first controller (41).

4. The testing device (100) according to claim 3, characterized in that: Also includes: A display (52) is electrically connected to the processor (43) and is used to display the measured dynamic electrochemical impedance spectrum in real time.

5. The testing device (100) according to claim 1, characterized in that: 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, and used for performing clock synchronization between the alternating current generator (32) and the alternating voltage collector (33); and The second oscillator (422) is electrically connected to the dynamic operating condition generator (31) and the alternating current generator (32) respectively, and is used to perform clock synchronization on the dynamic operating condition generator (31) and the alternating current generator (32).

6. The testing device (100) according to claim 1, characterized in that: The processor (43) comprises: An acquisition unit (431) is electrically connected to the alternating current generator (32) and the alternating voltage collector (33) respectively, and is used to acquire the test current signal and the alternating voltage signal; as well as The calculation unit (432) is electrically connected to the acquisition unit (431) and is used to calculate the dynamic electrochemical impedance spectrum of the battery (10) to be tested.

7. The testing device (100) according to claim 1, characterized in that: The frequency range of the test current signal is 0.1mHz-1MHz, and the amplitude of the test current signal is 0.02C-0.5C.

8. The testing device (100) according to claim 1, characterized in that: When it is necessary to measure the electrochemical impedance of the battery to be tested (10), the dynamic operating condition generator (31) applies the same charging current or discharging current to the battery to be tested (10) and the reference battery (20) respectively.

9. The testing device (100) according to claim 8, characterized in that: The battery to be tested (10) is one of a lead-acid battery, a nickel-cadmium battery or a lithium battery.

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