Method, system and device for measuring electrochemical impedance spectroscopy and readable storage medium

Abstract

The invention provides an electrochemical impedance spectroscopy measurement method, system and device and a readable storage medium. The method comprises the following steps: inputting an excitation signal for measuring the EIS into a battery in an electric device, obtaining a current value sequence and a voltage value sequence of the battery in the process of inputting the excitation signal into the battery, and determining the electrochemical impedance spectroscopy of the battery according to the current value sequence and the voltage value sequence. According to the method, a detection device does not need to be independently configured for the battery, the measurement cost of the EIS can be reduced, the operation is relatively simple, and the method has relatively high practical application capability.

Description

Electrochemical impedance spectroscopy measurement method, system, device and readable storage medium Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, system, device and readable storage medium for measuring electrochemical impedance spectroscopy. Background Art

[0002] Batteries, as energy storage devices, are widely used in various electrical devices. As the power source of these devices, the battery's condition is crucial to their safe, stable, and reliable operation. Therefore, it's essential to monitor the battery's condition during use.

[0003] A battery's impedance characteristics are closely related to its state of charge (SOC), state of health (SOH), and internal temperature. When testing the battery's condition, the electrochemical impedance spectrum (EIS) is used to analyze the battery's impedance characteristics, accurately determining the battery's condition.

[0004] In the related art, battery EIS testing is mainly performed using specialized testing equipment. However, these testing equipment are complex, costly, and not practically applicable. Therefore, there is an urgent need for a practical EIS measurement method to test battery EIS.

[0005] Application Contents

[0006] The purpose of the embodiments of the present application is to provide a method, system, device and readable storage medium for measuring electrochemical impedance spectroscopy, including but not limited to solving the problem in the prior art that the electrochemical impedance spectrum of a battery cannot be measured by a simple and low-cost method.

[0007] In a first aspect, a method for measuring electrochemical impedance spectroscopy is provided, the method comprising:

[0008] Inputting an excitation signal to a first battery in an electrical device, wherein the excitation signal is used to measure an electrochemical impedance spectrum of the first battery;

[0009] Acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes current values ​​of the first battery during a process in which the excitation signal is input into the first battery, and the voltage value sequence includes voltage values ​​of the first battery during a process in which the excitation signal is input into the first battery;

[0010] An electrochemical impedance spectrum of the first battery is determined based on the current value sequence and the voltage value sequence.

[0011] In the embodiment of the present application, when measuring the electrochemical impedance spectrum of the battery, there is no need to configure a separate detection device for the battery, which can reduce the measurement cost of the electrochemical impedance spectrum and is relatively simple to operate. Therefore, the EIS measurement method provided in the embodiment of the present application has high practical application capabilities.

[0012] In one embodiment, determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence includes:

[0013] In a case where the voltage value sequence includes the voltage value corresponding to the identification signal, determining a voltage value subsequence corresponding to the excitation signal from the voltage value sequence;

[0014] In a case where the current value sequence includes the current value corresponding to the identification signal, determining a current value subsequence corresponding to the excitation signal from the current value sequence;

[0015] The electrochemical impedance spectrum is determined based on the voltage value subsequence and the current value subsequence.

[0016] In the implementation of the present application, in the process of determining the electrochemical impedance spectrum based on the current value sequence and the voltage value sequence, a voltage value subsequence corresponding to the excitation signal is extracted from the voltage value sequence, and a current value subsequence corresponding to the excitation signal is extracted from the current value sequence. Since the current value subsequence and the voltage value subsequence are the voltage value and current value of the battery under the action of the excitation signal, the electrochemical impedance spectrum can be calculated based on the current value subsequence and the voltage value subsequence, and the introduction of other voltage values ​​and current values ​​can be avoided, thereby improving the accuracy of the electrochemical impedance spectrum.

[0017] In one embodiment, after determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence, the method further includes: adjusting a charging strategy of the first battery according to the electrochemical impedance spectrum.

[0018] In the embodiment of the present application, after determining the electrochemical impedance spectrum of the first battery, the charging strategy of the first battery can be adjusted based on the electrochemical impedance spectrum of the first battery. Because the state of the first battery can be determined relatively accurately based on the electrochemical impedance spectrum, adjusting the charging strategy of the first battery based on the electrochemical impedance spectrum can more accurately control the charging process of the first battery.

[0019] In one embodiment, after determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence, the method further includes: outputting state information of the first battery, the state information being determined according to the electrochemical impedance spectrum.

[0020] In the embodiment of the present application, after determining the electrochemical impedance spectrum of the first battery, status information of the first battery can be output based on the electrochemical impedance spectrum of the first battery. Because the status of the first battery can be accurately determined based on the electrochemical impedance spectrum, relatively accurate status information can be output based on the electrochemical impedance spectrum, making it easier for a user to determine the status of the first battery based on the status information.

[0021] In a second aspect, a system for measuring electrochemical impedance spectroscopy is provided, the system comprising: a charging device and a power-consuming device;

[0022] The charging device is used to input an excitation signal to the first battery in the power-consuming device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery;

[0023] The charging device is further configured to obtain a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery;

[0024] The charging device is further configured to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0025] In the embodiments of the present application, a charging device inputs an excitation signal to a battery in a power-consuming device and determines the electrochemical impedance spectrum based on a sequence of voltage values ​​and current values. This eliminates the need for a separate detection device for the battery, reducing the cost of electrochemical impedance spectroscopy measurements. Furthermore, the connection between the charging device and the power-consuming device is conventional, making operation relatively simple. Therefore, the EIS measurement method provided in the embodiments of the present application has high practical applicability.

[0026] In one embodiment, the charging device is specifically used to obtain the current value sequence and the voltage value sequence sampled by the electric user from the electric user; or, the charging device is specifically used to obtain one of the current value sequence and the voltage value sequence sampled by the electric user from the electric user, and sample the other one of the current value sequence and the voltage value sequence; or, the charging device is specifically used to sample the current value sequence and the voltage value sequence.

[0027] In the embodiment of the present application, after determining the electrochemical impedance spectrum of the first battery, status information of the first battery can be output based on the electrochemical impedance spectrum of the first battery. Because the status of the first battery can be accurately determined based on the electrochemical impedance spectrum, relatively accurate status information can be output based on the electrochemical impedance spectrum, making it easier for a user to determine the status of the first battery based on the status information.

[0028] In a third aspect, a system for measuring electrochemical impedance spectroscopy is provided, the system comprising: a charging device and a power-consuming device;

[0029] The charging device is used to input an excitation signal to the first battery in the power-consuming device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery;

[0030] The power-consuming device is configured to obtain a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery;

[0031] The electrical device is further configured to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0032] In the embodiments of the present application, a charging device inputs an excitation signal to a battery in a power-consuming device, and the power-consuming device determines the electrochemical impedance spectrum based on the voltage value sequence and current value requirements. This eliminates the need for a separate detection device for the battery, thereby reducing the cost of electrochemical impedance spectroscopy measurement. Furthermore, direct calculation and determination of the electrochemical impedance spectrum by the power-consuming device facilitates timely acquisition of battery status based on the electrochemical impedance spectrum and adjustment of charging strategies.

[0033] In one embodiment, the electric device is specifically used to obtain the current value sequence and the voltage value sequence sampled by the charging device from the charging device; or, the electric device is specifically used to obtain one of the current value sequence and the voltage value sequence sampled by the charging device from the charging device, and sample the other one of the current value sequence and the voltage value sequence; or, the electric device is specifically used to sample the current value sequence and the voltage value sequence.

[0034] In an embodiment of the present application, when the voltage value sequence and current value sequence of the first battery are sampled by the power consumer, the voltage value and current value sequence sampled by the power consumer are more accurate, which can improve the EIS calculated based on the voltage value sequence and current value sequence. When one of the voltage value sequence and current value sequence is sampled by the power consumer and the other is sampled by the charging device, the sampling method of the voltage value and current value can be flexibly set according to needs. When the voltage value sequence and current value sequence of the first battery are sampled by the power consumer, the power consumer does not need to send the voltage value sequence and current value sequence to the charging device during the charging process, which can simplify the interaction process between the power consumer and the charging device.

[0035] In a fourth aspect, a system for measuring electrochemical impedance spectroscopy is provided, the system comprising: a charging device, a power-consuming device, and a server;

[0036] The charging device is used to input an excitation signal to the first battery in the power-consuming device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery;

[0037] The server is configured to obtain a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery;

[0038] The server is further configured to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0039] In the embodiments of the present application, a charging device inputs an excitation signal to a battery in an electrical device, and a server determines an electrochemical impedance spectrum based on a voltage sequence and current requirements. This eliminates the need for a separate battery detection device, reducing the cost of measuring the electrochemical impedance spectrum. Furthermore, direct calculation and determination of the electrochemical impedance spectrum by the server facilitates determining the status of the battery in the electrical device based on the electrochemical impedance spectrum, enabling effective management of the electrical device based on the battery's status.

[0040] In one embodiment, the server is specifically used to obtain the current value sequence and the voltage value sequence from the charging device or the power-consuming device; or, the server is specifically used to obtain one of the current value sequence and the voltage value sequence sampled by the charging device from the charging device, and obtain the other of the current value sequence and the voltage value sequence sampled by the power-consuming device from the power-consuming device.

[0041] In this embodiment of the present application, when the voltage and current value sequences of the first battery are sampled by an electrical device, the voltage and current values ​​sampled by the electrical device are more accurate, thereby improving the EIS calculated from the voltage and current value sequences. When one of the voltage and current value sequences is sampled by the electrical device and the other by the charging device, the voltage and current sampling method can be flexibly configured as needed.

[0042] In one embodiment, the charging device includes a measuring module, and the measuring module is used to connect to the first battery to input the excitation signal to the first battery.

[0043] In one embodiment, the measurement module comprises a signal generator for generating the excitation signal.

[0044] In an embodiment of the present application, when the measurement module includes a signal generator, the signal generator can transform the voltage of the power supply in the charging device to generate an excitation signal. The implementation of the signal generator is relatively simple, which can reduce the difficulty of developing the charging device.

[0045] In one embodiment, the charging device further includes a power supply and a voltage conversion module; the input end of the voltage conversion module is connected to the power supply, and the output end is used to connect to the first battery, for converting the voltage of the power supply to obtain and input a charging current to the first battery.

[0046] In an embodiment of the present application, when the charging device further includes a power supply and a voltage conversion module, the charging device can charge the battery in the power-consuming device through the voltage conversion module and measure the electrochemical impedance spectrum of the battery in the power-consuming device during the charging process.

[0047] In one embodiment, the power source comprises a second battery.

[0048] In an embodiment of the present application, when the power source in the charging device includes a second battery, the charging device can store energy through the second battery to charge the charging device in the event of a power outage, thereby ensuring the power demand of the charging device in the event of a power outage.

[0049] In a fifth aspect, a method for measuring electrochemical impedance spectroscopy is provided, which is applied to a charging device, and the method comprises:

[0050] inputting an excitation signal to a first battery in the electric device;

[0051] The excitation signal is used to measure the electrochemical impedance spectroscopy of the first battery.

[0052] In an embodiment of the present application, a charging device inputs an excitation signal to a battery in an electrical device, and the electrochemical impedance spectrum of the battery is determined based on the excitation signal. When measuring the electrochemical impedance spectrum of the battery, there is no need to configure a separate detection device for the battery, which can reduce the cost of measuring the electrochemical impedance spectrum. In addition, the connection between the charging device and the electrical device is a conventional connection, which is relatively simple to operate. Therefore, the EIS measurement method provided in the embodiment of the present application has high practical application capabilities.

[0053] In one embodiment, before inputting the excitation signal to the first battery in the electrical device, the method further includes: inputting a first identification signal to the first battery, wherein the first identification signal is used to identify that the excitation signal starts to be input to the first battery.

[0054] In an embodiment of the present application, when determining the EIS of the first battery, the charging device can determine the current value and voltage value at the same sampling time point corresponding to the excitation signal from the current value sequence and the voltage value sequence based on the voltage value and current value corresponding to the first identification signal, thereby achieving alignment of the voltage value and current value corresponding to the excitation signal, and determining the impedance of the battery based on the aligned voltage value and current value, so as to calculate a more accurate impedance and thus obtain a more accurate electrochemical impedance spectrum.

[0055] In one embodiment, after inputting the excitation signal to the first battery in the electric device, the method further includes:

[0056] A second identification signal is input to the first battery, where the second identification signal is used to indicate that the input of the excitation signal to the first battery is stopped.

[0057] In an embodiment of the present application, the charging device inputs a second identification signal to the first battery after inputting an excitation signal to the first battery. When determining the EIS of the first battery, voltage values ​​unrelated to the excitation signal can be removed from a voltage value sequence based on the voltage value corresponding to the second identification signal, and current values ​​unrelated to the excitation signal can be removed from a current value sequence based on the current value corresponding to the second identification signal, so as to improve the accuracy of the current value and voltage value corresponding to the excitation signal, thereby obtaining a more accurate electrochemical impedance spectrum.

[0058] In one embodiment, the duration of the identification signal input by the charging device to the first battery is greater than or equal to a preset number of sampling periods of the excitation signal.

[0059] In one embodiment, the preset number is 3.

[0060] In an embodiment of the present application, the duration of the identification signal input by the charging device to the first battery is not less than a preset number of sampling cycles of the excitation signal. When sampling the voltage and current corresponding to the excitation signal, the sampled current value sequence and voltage value sequence can include a larger number of voltage values ​​and current values ​​corresponding to the identification signal, so that the voltage values ​​and current values ​​corresponding to the identification signal and the excitation signal can be distinguished more accurately from the current value sequence and voltage value sequence.

[0061] In one embodiment, the identification signal input by the charging device to the first battery includes any one of a single pulse signal, a multi-pulse signal, a step signal, a triangular wave signal, and a trapezoidal wave signal.

[0062] In the embodiment of the present application, since the voltage values ​​and current values ​​corresponding to identification signals such as single pulse signals, multi-pulse signals, step signals, triangular wave signals and trapezoidal wave signals are easy to identify, when the identification signal is one of the above signals, it is convenient to distinguish the voltage value corresponding to the excitation signal and the voltage value corresponding to the identification signal.

[0063] In one embodiment, inputting an excitation signal to a first battery in the electric device includes:

[0064] An excitation signal is input to the first battery at preset time intervals; or the excitation signal is input to the first battery when the state of charge of the first battery reaches a preset threshold.

[0065] In an embodiment of the present application, when measuring the electrochemical impedance spectrum of the first battery, the charging device can input an excitation signal to the first battery once every preset time period or input an excitation signal to the first battery when the state of charge of the first battery reaches a preset threshold value. This can reduce the time period for measuring the EIS of the first battery, thereby reducing the power consumption of the charging device.

[0066] In one embodiment, the method further comprises:

[0067] obtaining a current value sequence and a voltage value sequence of the first battery;

[0068] The electrochemical impedance spectrum is determined based on the current value sequence and the voltage value sequence.

[0069] In an embodiment of the present application, when the charging device obtains the voltage value sequence and the current value sequence of the first battery under the action of the excitation signal in the process of inputting the excitation signal to the electrical device, and determines the EIS of the first battery based on the voltage value sequence and the current value sequence, it can be convenient for the charging device to obtain the EIS of the first battery in a timely manner when connected to the electrical device, so as to respond in a timely manner when it is determined that the first battery has an abnormality based on the EIS of the first battery.

[0070] In one embodiment, obtaining the current value sequence and the voltage value sequence of the first battery includes:

[0071] Acquire, from the electrical device, the current value sequence and the voltage value sequence sampled by the electrical device;

[0072] Alternatively, one of the current value sequence and the voltage value sequence sampled by the electrical device is obtained from the electrical device, and the other of the current value sequence and the voltage value sequence is obtained by sampling;

[0073] Alternatively, the current value sequence and the voltage value sequence are obtained by sampling.

[0074] In an embodiment of the present application, when the voltage value sequence and current value sequence of the first battery are sampled by the power consumer, the voltage value and current value sequence sampled by the power consumer are more accurate, which can improve the EIS calculated based on the voltage value sequence and current value sequence. When one of the voltage value sequence and current value sequence is sampled by the power consumer and the other is sampled by the charging device, the sampling method of the voltage value and current value can be flexibly set according to needs. When the voltage value sequence and current value sequence of the first battery are sampled by the power consumer, the power consumer does not need to send the voltage value sequence and current value sequence to the charging device during the charging process, which can simplify the interaction process between the power consumer and the charging device.

[0075] In one embodiment, the method further includes: sending the acquired current value sequence and / or voltage value sequence of the first battery to a server.

[0076] In an embodiment of the present application, the charging device sends one or both of the voltage value sequence and the current value sequence to the server, and the server determines the electrochemical impedance spectrum of the first battery based on the current value sequence and the voltage value sequence, which can reduce the calculation amount of the charging device.

[0077] In a sixth aspect, a method for measuring electrochemical impedance spectroscopy is provided, the method comprising:

[0078] Acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes current values ​​of a first battery in an electrical device during a process in which an excitation signal is input into the first battery, and the voltage value sequence includes voltage values ​​of the first battery during a process in which the excitation signal is input into the first battery, wherein the excitation signal is input into the first battery by a charging device;

[0079] An electrochemical impedance spectrum of the first battery is determined based on the current value sequence and the voltage value sequence.

[0080] In one embodiment, determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence includes:

[0081] In a case where the voltage value sequence includes the voltage value corresponding to the identification signal, determining a voltage value subsequence corresponding to the excitation signal from the voltage value sequence;

[0082] In a case where the current value sequence includes the current value corresponding to the identification signal, determining a current value subsequence corresponding to the excitation signal from the current value sequence;

[0083] The electrochemical impedance spectrum is determined based on the voltage value subsequence and the current value subsequence.

[0084] In one embodiment, the method is applied to a server, and obtaining a current value sequence and a voltage value sequence includes:

[0085] Acquire the current value sequence and the voltage value sequence from the power-consuming device or the charging device;

[0086] Alternatively, the current value sequence is obtained from one of the power consumption device and the charging device, and the voltage value sequence is obtained from the other.

[0087] In one embodiment, the method further includes: adjusting a charging strategy of the first battery according to the electrochemical impedance spectroscopy.

[0088] In one embodiment, the method further includes: outputting status information of the first battery, wherein the status information is determined according to the electrochemical impedance spectroscopy.

[0089] In a seventh aspect, a device for measuring electrochemical impedance spectroscopy is provided, the device comprising a measuring module;

[0090] The measuring module is used to input an excitation signal to the first battery in the electrical device;

[0091] The excitation signal is used to measure the electrochemical impedance spectroscopy of the first battery.

[0092] In one embodiment, the measurement module is further configured to input an identification signal to the first battery.

[0093] In one embodiment, the measurement module is specifically configured to input an excitation signal to the first battery at preset time intervals; or input the excitation signal to the first battery when the state of charge of the first battery reaches a preset threshold.

[0094] In one embodiment, the apparatus further comprises:

[0095] an acquisition module, configured to acquire a current value sequence and a voltage value sequence of the first battery;

[0096] A determination module is used to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0097] In one embodiment, the device further includes: an adjustment module, configured to adjust a charging strategy of the first battery according to the electrochemical impedance spectroscopy.

[0098] In one embodiment, the device further includes: an output module, configured to output status information of the first battery, wherein the status information is determined according to the electrochemical impedance spectroscopy.

[0099] In one embodiment, the apparatus further comprises:

[0100] A sending module is configured to send the acquired current value sequence and / or voltage value sequence of the first battery to a server.

[0101] In one embodiment, the measurement module includes a signal generator, and the signal generator is used to connect to the first battery and input the excitation signal to the first battery.

[0102] In one embodiment, the apparatus further comprises a power supply and voltage conversion module;

[0103] The voltage conversion module has an input end connected to the power supply, and an output end connected to the first battery, and is configured to convert the voltage of the power supply to obtain and input a charging current to the first battery.

[0104] In one embodiment, the power source comprises a second battery.

[0105] In an eighth aspect, a device for measuring electrochemical impedance spectroscopy is provided, wherein the device for measuring electrochemical impedance spectroscopy comprises:

[0106] an acquisition module, configured to acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes current values ​​of a first battery in an electrical device during a process in which an excitation signal is input into the first battery, and the voltage value sequence includes voltage values ​​of the first battery during a process in which the excitation signal is input into the first battery, wherein the excitation signal is input into the first battery by a charging device;

[0107] A determination module is configured to determine an electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence.

[0108] In one embodiment, the device further includes: an adjustment module, configured to adjust a charging strategy of the first battery according to the electrochemical impedance spectroscopy.

[0109] In one embodiment, the device further includes: an output module, configured to output status information of the first battery, wherein the status information is determined according to the electrochemical impedance spectroscopy.

[0110] In a ninth aspect, a readable storage medium is provided, wherein the readable storage medium is used to store a computer program. When the computer program is executed by an electrochemical impedance spectroscopy measuring device, the electrochemical impedance spectroscopy measuring device performs the method described in the fifth aspect or the sixth aspect.

[0111] In a tenth aspect, a computer program product is provided, comprising: a computer program, which, when run on an electrochemical impedance spectroscopy measuring device, enables the electrochemical impedance spectroscopy measuring device to perform the electrochemical impedance spectroscopy measuring method provided by any possible implementation of the fifth or sixth aspect.

[0112] In the eleventh aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, so that an electrochemical impedance spectroscopy measuring device equipped with the chip performs the electrochemical impedance spectroscopy measuring method provided by any possible implementation of the fifth or sixth aspect.

[0113] It can be understood that the electrochemical impedance spectroscopy measuring devices provided in the fourth and fifth aspects, the readable storage medium provided in the sixth aspect, the computer program product provided in the seventh aspect, and the chip provided in the eighth aspect are all used to execute the electrochemical impedance spectroscopy measuring method provided in the first or second aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods provided above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0114] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0115] FIG1 shows a schematic diagram of an electrochemical impedance spectroscopy measurement scenario provided in an embodiment of the present application.

[0116] FIG2 shows a schematic flow chart of a method for measuring electrochemical impedance spectroscopy provided in an embodiment of the present application.

[0117] FIG3 shows a schematic structural diagram of a charging device provided in an embodiment of the present application.

[0118] FIG4 shows a schematic structural diagram of an electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application.

[0119] FIG5 shows a schematic structural diagram of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application.

[0120] FIG6 shows a schematic flow chart of a method for measuring electrochemical impedance spectroscopy provided in an embodiment of the present application.

[0121] FIG7 shows a schematic structural diagram of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application.

[0122] FIG8 shows a schematic diagram of a signal change provided in an embodiment of the present application.

[0123] FIG9 shows another schematic diagram of signal changes provided by an embodiment of the present application.

[0124] FIG10 shows another schematic diagram of signal changes provided in an embodiment of the present application.

[0125] FIG11 shows a schematic flow chart of another electrochemical impedance spectroscopy measurement method provided in an embodiment of the present application.

[0126] FIG12 shows a schematic structural diagram of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application.

[0127] FIG13 shows a schematic flow chart of another electrochemical impedance spectroscopy measurement method provided in an embodiment of the present application.

[0128] FIG14 shows a schematic structural diagram of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application.

[0129] FIG15 shows a schematic flow chart of another electrochemical impedance spectroscopy measurement method provided in an embodiment of the present application.

[0130] FIG16 shows a schematic structural diagram of an electrochemical impedance spectroscopy measuring device provided in an embodiment of the present application.

[0131] FIG17 is a structural block diagram of an electrochemical impedance spectroscopy measuring device provided in an embodiment of the present application.

[0132] Reference Symbols: 1. Detection device; 11. Signal generator; 12. Current sensor; 13. Voltage sensor; 14. Computer. 2. Battery. 3. Charging device; 31. Control module; 32. Measurement module; 33. Voltage conversion module; 34. Power supply; 35. Sensor module; 351. Current sensor; 352. Voltage sensor; 36. Charging input interface; 37. Charging output interface; 38. Voltage module. 4. Power consumption device; 41. First battery; 42. Charging input interface; 43. Battery management system. 5. Server. DETAILED DESCRIPTION

[0133] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0134] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0135] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0136] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0137] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0138] In order to facilitate understanding of this application, a brief introduction to the relevant technology is first given.

[0139] In battery testing, EIS testing is a technology that analyzes the battery status in a non-destructive way. By measuring the EIS of the battery and analyzing the impedance characteristics of the battery based on EIS, the internal conditions of the battery, such as SOC, SOH, internal temperature and lithium deposition, can be analyzed, thereby more accurately determining the battery status.

[0140] During the EIS measurement process, the detection device needs to input an excitation signal to the battery and obtain the voltage and current values ​​of the battery under the action of the excitation signal, and determine the EIS of the battery based on the voltage and current values.

[0141] FIG1 shows a schematic diagram of an electrochemical impedance spectroscopy measurement scenario provided in an embodiment of the present application. The detection device 1 includes a signal generator 11, a current sensor 12, a voltage sensor 13, and a computer 14. When measuring the EIS of a battery, the signal generator 11 generates an excitation signal and inputs the excitation signal to the battery 2. The voltage sensor 13 collects the voltage value of the battery 2 under the action of the excitation signal, and the current sensor 12 collects the current value of the excitation signal. The computer 14 determines the EIS of the battery 2 based on the voltage and current values ​​collected by the voltage sensor 13 and the current sensor 12.

[0142] As shown in Figure 1, the detection device 1 includes a signal generator 11, a current sensor 12, a voltage sensor 13, and a computer 14, which is relatively complex and costly. Configuring the detection device for the electrical device during actual use increases the cost of the device. Furthermore, the battery 2 is typically integrated within the device. Even if the detection device 1 is configured for the device, connecting the detection device 1 to the battery 2 within the device is difficult. Therefore, the solution of measuring the EIS of a battery using a detection device is not practical.

[0143] The technical concept behind the EIS measurement method provided in the embodiments of this application is that, during use, an electrical device is necessarily connected to a charging device, which charges the battery within the device. If the charging device is capable of outputting an excitation signal, then, after connection to the electrical device, the charging device can input the excitation signal to the battery within the device, thereby enabling EIS measurements to be performed on the battery within the device.

[0144] Based on the above technical concept: The embodiment of the present application provides an EIS measurement method and a charging device. After the charging device is connected to an electrical device, it can input an excitation signal to the battery in the electrical device, so that the EIS of the battery in the electrical device can be measured by the excitation signal output by the charging device.

[0145] In an embodiment of the present application, a charging device inputs an excitation signal to a battery in an electrical device, and the electrochemical impedance spectrum of the battery is determined based on the excitation signal. When measuring the electrochemical impedance spectrum of the battery, there is no need to configure a separate detection device for the battery, which can reduce the cost of measuring the electrochemical impedance spectrum. In addition, the connection between the charging device and the electrical device is a conventional connection, which is relatively simple to operate. Therefore, the EIS measurement method provided in the embodiment of the present application has high practical application capabilities.

[0146] FIG2 is a flow chart of a method for measuring electrochemical impedance spectroscopy provided in an embodiment of the present application. As shown in FIG2 , the method includes steps 21 , 22 , and 23 .

[0147] Step 21: Input an excitation signal to the first battery in the electrical device.

[0148] The excitation signal is used to measure the electrochemical impedance spectrum of the first battery. The amplitude of the excitation signal is, for example, an AC signal with a small amplitude, such as 5 millivolts (mV), 4.7 mV, 4.8 mV, 5.1 mV, or 5.4 mV. The frequency of the excitation signal can be between 0.01 Hz and 10 kilohertz (kHz). The excitation signal can include an excitation signal of a single frequency or be composed of excitation signals of multiple frequencies.

[0149] The charging device may input an excitation signal to the first battery in the power-consuming device. Specific parameters of the excitation signal may be set as required, and this embodiment does not impose any limitation thereto.

[0150] Step 22: Obtain a current value sequence and a voltage value sequence.

[0151] The current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery.

[0152] In this embodiment, during the process of inputting an excitation signal to the first battery in the power-consuming device, the current value of the first battery can be obtained to obtain a current value sequence, and the voltage value of the first battery can be obtained to obtain a voltage value sequence. For example, the current value and current value of the first battery can be sampled by the charging device to obtain a current value sequence and a voltage value sequence, or the current value and current value of the first battery can be sampled by the power-consuming device to obtain a current value sequence and a voltage value sequence, or one of the charging device and the power-consuming device can sample the current value of the first battery to obtain a current value sequence, and the other can sample the voltage value of the first battery to obtain a voltage value sequence.

[0153] Step 23: Determine the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence.

[0154] In this embodiment, after the current value sequence and the voltage value sequence are acquired, the electrochemical impedance spectrum of the first battery can be determined according to the current value sequence and the voltage value sequence.

[0155] In order to facilitate understanding of the electrochemical impedance spectroscopy measurement method provided in the embodiment of the present application, the charging device provided in the embodiment of the present application is introduced below.

[0156] FIG3 shows a schematic diagram of the structure of a charging device provided in an embodiment of the present application. As shown in FIG3 , the charging device 3 includes a control module 31 , a measurement module 32 and a voltage conversion module 33 .

[0157] FIG4 shows a schematic diagram of the structure of an electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application. As shown in FIG4 , the measurement system includes a charging device 3 and an electrical device 4 .

[0158] The control module 31 is connected to the measurement module 32 and the voltage conversion module 33. The measurement module 32 includes a signal generator that can be connected to the first battery 41 in the power device 4 and input an excitation signal to the first battery 41. The input end of the voltage conversion module 33 is connected to the power supply 34, and the output end of the voltage conversion module 33 can be connected to the first battery 41. The voltage conversion module 33 can convert the voltage of the power supply 34 to obtain and input a charging current to the first battery 41.

[0159] In one embodiment, the charging device can be a mobile charging device, such as an in-vehicle charging device, or other portable charging device. When the charging device is a mobile charging device, the power source 34 can be a battery, which serves as the power source for the charging device 3. To distinguish it from the first battery 41 in the power-consuming device 4, the battery in the charging device 3 can be referred to as the second battery.

[0160] The second battery may be composed of one or more battery modules, each of which may be composed of multiple battery cells (also known as battery cells) connected in series and / or in parallel. The specific implementation of the second battery can be set as required and is not limited in this embodiment.

[0161] In another embodiment, the charging device may be a fixed charging device, such as a charging pile. When the charging device is a fixed charging device, the power supply 34 may be a power input port, which may be connected to a mains power supply to power the charging device 3.

[0162] Figure 5 shows a schematic diagram of the structure of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application. Charging device 3 is a fixed charging device, and power supply 34 is a power input port. The power input port can be any type of port that can be connected to mains power, and this embodiment does not impose any restrictions on this.

[0163] The above examples are merely illustrative. The power supply in the charging device may also be other forms of power supply. For example, the power supply may be composed of a second battery and a power input port. This embodiment does not limit the specific implementation of the power supply in the charging device.

[0164] In one embodiment, when the power source 34 is a second battery, the control module 31 may be a battery management system (BMS), and the BMS may control the charging and discharging of the second battery.

[0165] As shown in FIG4 , the charging device 3 may further include a charging input interface 36 , which includes a negative input terminal identified by the symbol “-” and a positive input terminal identified by the symbol “+”. The positive input terminal of the charging input interface 36 is connected to the positive terminal of the second battery, and the negative input terminal of the charging input interface 36 is connected to the negative terminal of the second battery.

[0166] During use of the charging device 3, when the second battery is low on power, the charging input interface 36 can be connected to an external power source, such as a charging pile, with the positive input end of the charging input interface 36 connected to the positive terminal of the charging pile, and the negative input end of the charging input interface 36 connected to the negative terminal of the charging pile. At this time, the control module 31 can control the second battery to enter a charging state, and charge the second battery through the charging pile.

[0167] In this embodiment, the voltage conversion module 33 is used to convert the output voltage of the power source 34 to obtain and input a charging current to the first battery 41 to charge the first battery 41. As shown in Figure 4, when the power source 34 is a second battery, the voltage conversion module 33 can be a direct current to direct current (DCDC) converter. The input terminals of the voltage conversion module 33 are connected to the two terminals of the second battery. For example, the positive input terminal of the voltage conversion module 33 is connected to the positive terminal of the second battery, and the negative input terminal of the voltage conversion module 33 is connected to the negative terminal of the second battery, thereby achieving electrical connection between the voltage conversion module 33 and the second battery.

[0168] As shown in Figure 4, charging device 3 also includes a charging output interface 37, which includes a negative output terminal (denoted by the symbol "-") and a positive output terminal (denoted by the symbol "+"). The positive output terminal of voltage conversion module 33 is connected to the positive output terminal of charging output interface 37, and the negative output terminal of voltage conversion module 33 is connected to the negative output terminal of charging output interface 37, thereby establishing an electrical connection between charging output interface 37 and voltage conversion module 33.

[0169] As shown in FIG4 , the power-consuming device 4 includes a charging input interface 42 , which includes a negative input terminal (denoted by the symbol “-”) and a positive input terminal (denoted by the symbol “+”). The positive input terminal of the charging input interface 42 is connected to the positive terminal of the first battery 41 , while the negative input terminal of the charging input interface 42 is connected to the negative terminal of the first battery 41 .

[0170] When the charging output interface 37 is connected to the charging input interface 42, the positive output end of the charging output interface 37 is connected to the positive input end of the charging input interface 42, and the negative output end of the charging output interface 37 is connected to the negative input end of the charging input interface 42, so that the charging output interface 37 is electrically connected to the first battery 41, thereby electrically connecting the voltage conversion module 33 to the first battery 41.

[0171] After determining the electrical connection between the charging device 3 and the electrical device 4, the control module 31 can send a second instruction to the voltage conversion module 33. After receiving the second instruction, the voltage conversion module 33 starts to operate and converts the output voltage of the second battery to obtain a charging current. The charging current enters the first battery 41 after passing through the electrically connected charging output interface 37 and the charging input interface 42 to charge the first battery 41.

[0172] Among them, after determining that the charging of the first battery 41 is completed, the control module 31 can send a fourth instruction to the voltage conversion module 33. After receiving the fourth instruction, the voltage conversion module 33 stops running to stop inputting charging current to the first battery 41 and stop charging the first battery 41.

[0173] As shown in Figure 5, when the charging device 3 is a fixed charging device and the power supply 34 is a power input port, the voltage conversion module 33 can be a rectifier. During the charging process of the first battery 41, the rectifier can rectify the mains power connected to the power input port to obtain and input the charging current to the first battery 41.

[0174] As shown in Figure 4, the charging device 3 also includes a sensor module 35, which is connected to the control module 31 and may include a current sensor. During the process of inputting charging current to the first battery 41, the current sensor can sample the current output to the charging output interface 37 to obtain a current value, and then output the current value to the control module 31. The control module 31 can control the voltage conversion module 33 based on the current value output by the current sensor, so that the voltage conversion module 33 can output a stable charging current.

[0175] In one embodiment, the sensor module 35 may include a current sensor and a voltage sensor. The current sensor can sample the current output to the charging output interface 37 to obtain a current value, and the voltage sensor can sample the voltage at the positive output end and the negative output end of the charging output interface 37 to obtain a voltage value.

[0176] Among them, since the charging output interface 37 is connected to the two ends of the first battery 41 through the charging input interface 42, the current value sampled by the current sensor is the current value in the circuit of the first battery 41, and the voltage value sampled by the voltage sensor is the voltage value at both ends of the first battery 41.

[0177] The above are merely illustrative examples. The specific implementation methods of the control module, voltage conversion module, power supply and sensor module can be set according to requirements, and this embodiment does not limit this.

[0178] In the embodiment of the present application, the charging device 3 includes a measuring module 32 , which is used to generate an excitation signal and input the excitation signal to the first battery 41 .

[0179] As shown in FIG4 , when the charging device 3 is a mobile charging device including a second battery, the signal generator may be an inverter connected to both ends of the second battery for inverting the DC voltage output by the second battery to generate an excitation signal.

[0180] In this embodiment, when the signal generator is an inverter, the inverter is relatively simple to implement, which can reduce the difficulty of developing the charging device. In addition, the inverter technology is relatively mature, which can improve the stability during the EIS measurement process.

[0181] The positive input terminal of the inverter is connected to the positive terminal of the second battery, and the negative input terminal of the inverter is connected to the negative terminal of the second battery, thereby achieving an electrical connection between the inverter and the second battery. At the same time, the positive output terminal of the inverter is connected to the positive output terminal of the charging output interface 37, and the negative output terminal of the inverter is connected to the negative output terminal of the charging output interface 37, thereby achieving an electrical connection between the inverter and the charging output interface 37.

[0182] As shown in Figure 4, when the charging output interface 37 is connected to the charging input interface 42, the signal generator is indirectly connected to the first battery 41 through the interconnected charging output interface 37 and charging input interface 42. During operation of the charging device 3, the control module 31 can send a first instruction to the signal generator. Upon receiving the first instruction, the signal generator initiates operation in response to the first instruction, inverts the output voltage of the second battery, and generates an excitation signal. The excitation signal is input to the second battery through the charging output interface 37 and the charging input interface 42.

[0183] As shown in Figure 5 , when the charging device 3 is a fixed charging device and the power supply 34 is a power input port, the signal generator can be an AC transformer. The AC transformer is connected to the power input port. Upon receiving the first instruction, the AC transformer starts operating, transforms the mains power connected to the power input port, and generates and inputs the excitation signal to the first battery 41.

[0184] When the measurement is finished, the control module 31 may send a third instruction to the measurement module 32. Upon receiving the third instruction, the measurement module 32 stops outputting the excitation signal to stop measuring the EIS of the first battery 41.

[0185] In one embodiment, the charging device may obtain a current value sequence and a voltage value sequence of the first battery, and determine an electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence.

[0186] In this embodiment, when the signal generator is an AC transformer, the implementation of the AC transformer is relatively simple, which can reduce the difficulty of developing the charging device. In addition, the AC transformer technology is relatively mature, which can improve the stability during the EIS measurement process.

[0187] This embodiment provides a measurement system, including an electrical device and a charging device. The charging device is used to input an excitation signal to a first battery in the electrical device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery. The charging device is also used to determine the electrochemical impedance spectrum based on a current value sequence and a voltage value sequence.

[0188] FIG6 is a flow chart illustrating a method for measuring electrochemical impedance spectroscopy provided in an embodiment of the present application. The method can be performed by a charging device, for example, by the control module 31 in the charging device 3. As shown in FIG6 , the method can include steps 61 to 63.

[0189] Step 61: The charging device inputs an excitation signal to the first battery in the power-consuming device.

[0190] In one embodiment, after establishing electrical connection with the first battery 41, the charging device 3 may input an excitation signal to the first battery 41 when a preset first trigger condition is met, so as to measure the electrochemical impedance spectrum of the first battery 41 using the excitation signal. After inputting the excitation signal to the first battery 41, the charging device 3 may stop inputting the excitation signal to the first battery 41 when a preset second trigger condition is met, so as to stop measuring the electrochemical impedance spectrum of the first battery 41.

[0191] The first trigger condition and the second trigger condition can be set according to specific requirements, and this embodiment does not limit this.

[0192] Step 62: The charging device obtains a current value sequence and a voltage value sequence.

[0193] In one embodiment, the charging device 3 may sample the current in the loop of the first battery 41 to obtain a current value sequence, and the charging device may sample the voltage across the first battery 41 to obtain a voltage value sequence.

[0194] Figure 7 shows a schematic diagram of the structure of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application. In the charging device 3 shown in Figure 7, the voltage module 38 includes the measurement module 32 and voltage conversion module 33 shown in Figures 3 and 4. The sensor module 35 includes a current sensor 351 and a voltage sensor 352, each of which is communicatively connected to the control module 31.

[0195] The current sensor 351 samples the current output to the charging output interface 37 at a preset sampling frequency. After the control module 31 sends a first instruction to the measurement module 32 in the voltage module 38, causing the measurement module 32 to input an excitation signal to the first battery 41, the control module 31 can obtain the current value sampled by the current sensor 351 at each sampling time point, thereby obtaining a current value sequence consisting of multiple current values ​​obtained by continuous sampling.

[0196] Similarly, the voltage sensor 352 samples the voltage across the charging output interface 37 at a preset sampling frequency. After the control module 31 sends a first instruction to the measurement module 32, causing the measurement module 32 to input an excitation signal to the first battery 41, the control module 31 can obtain the voltage value sampled by the voltage sensor 352 at each sampling time point, thereby obtaining a voltage value sequence consisting of multiple voltage values ​​sampled continuously.

[0197] The sampling frequency of the voltage sensor 352 can be the same as the sampling frequency of the current sensor 351, and the sampling frequency of the voltage sensor 352 and the sampling frequency of the current sensor 351 can be greater than the frequency of the excitation signal. For example, when the frequency of the excitation signal is M, the sampling frequency of the current sensor 351 and the sampling frequency of the voltage sensor 352 can be no less than 5 times M.

[0198] In practical applications, when the sampling frequency of the current sensor 351 and the sampling frequency of the voltage sensor 352 are greater than the frequency of the excitation signal and not less than 5 times the frequency of the excitation signal, the sampled current value and voltage value can more accurately characterize the voltage transformation and current change of the first battery under the action of the excitation signal, thereby making the obtained electrochemical impedance spectrum more accurate.

[0199] As shown in Figures 3 and 4, the current value sampled by the current sensor 351 is the current value input to the first battery 41 through the charging output interface 37. Therefore, the current value sampled by the current sensor 351 is the current value of the current input into the loop of the first battery 41.

[0200] Similarly, the voltage value sampled by the voltage sensor 352 is the voltage value at both ends of the charging output interface 37. Since the two ends of the first battery 41 are connected to the charging output interface 37 through the charging input interface 42, the voltage value sampled by the voltage sensor 352 is the voltage value at both ends of the first battery 41.

[0201] The two ends of the charging output interface 37 are the positive output end and the negative output end of the charging output interface 37 , the two ends of the first battery 41 are the positive electrode and the negative electrode of the first battery 41 , and the circuit of the first battery 41 is the charging circuit.

[0202] Step 63: The charging device determines an electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0203] When the charging device 3 inputs an excitation signal to the first battery 41 before or after inputting a charging current to the first battery 41, only the excitation signal is input to the first battery 41. In this case, the current value sampled by the current sensor 351 is the current value of the excitation signal, and the voltage value sampled by the voltage sensor 352 is the voltage value of the first battery 41 under the action of the excitation signal.

[0204] In this embodiment, when the charging device 3 inputs an excitation signal to the first battery 41 before or after inputting a charging current to the first battery 41 , the charging device 3 can directly determine the EIS of the first battery according to the current value sequence and the voltage value sequence.

[0205] As shown in FIG7 , the control module 31 may include a calculation unit configured to determine the EIS of the first battery 41 based on the current value sequence and the voltage value sequence. The calculation unit may be implemented by a software module and / or a hardware module in the control module 31, and this embodiment does not limit this.

[0206] Figure 8 shows a schematic diagram of signal changes provided by an embodiment of the present application. In Figure 8 , the abscissa represents time, and the ordinate represents amplitude. Curve 71 is a local current change curve for the excitation signal, consisting of multiple current values ​​of the excitation signal over a period of time. Curve 72 is composed of multiple voltage values ​​across the first battery 41 over a period of time. Curve 72 shows the voltage change curve across the first battery 41 under the influence of the excitation signal.

[0207] When determining the EIS of the first battery 41, the charging device 3 can select the voltage value and current value sampled at the same sampling time point from the current value sequence and the voltage value sequence, calculate the ratio between the voltage value and the current value sampled at the same sampling time point to obtain the impedance value, and thus obtain the EIS of the first battery composed of a series of impedance values.

[0208] For example, the current value in the current value sequence is i(n), the voltage value in the voltage value sequence is v(n), and n is the count value of the sampling period. The sampling period can be determined according to the sampling frequency. After obtaining the current value sequence and the voltage value sequence, the current value i(n) in the current value sequence can be Fourier transformed to obtain Fi(f), and the voltage value v(n) in the voltage value sequence can be Fourier transformed to obtain Fu(f). The impedance of the first battery 41 is represented by Z(f), and the impedance calculation formula is:

[0209] For example, the current value i1 and voltage value v1 shown in Figure 8 are the current and voltage values ​​sampled by current sensor 351 and voltage sensor 352 at the same sampling time point t1. The control module 31 can calculate the ratio of voltage value v1 to current value i1 to obtain the impedance value corresponding to sampling time point t1. Similarly, the ratio of the voltage value to the current value sampled at each sampling time point can be calculated to obtain the EIS of the first battery, which is composed of a series of impedance values.

[0210] When the charging device 3 inputs an excitation signal to the first battery 41 while supplying a charging current to the first battery 41, the current input to the first battery 41 includes both the excitation signal and the charging current. In this case, the current value sampled by the current sensor 351 includes not only the AC current component corresponding to the excitation signal, but also the DC current component corresponding to the charging current. The voltage value sampled by the voltage sensor 352 includes not only the AC voltage component corresponding to the excitation signal, but also the DC voltage component corresponding to the charging current.

[0211] In this embodiment, when the charging device 3 inputs an excitation signal to the first battery 41 while inputting a charging current to the first battery 41, the charging device 3 can extract the AC voltage component corresponding to the excitation signal from the voltage value sequence, and extract the AC current component corresponding to the excitation signal from the current value sequence. For example, the voltage value sequence shown by curve 72 can be extracted from the voltage value sequence (this voltage value sequence is the AC voltage component), and the current value sequence shown by curve 71 can be extracted from the current value sequence (this current value sequence is the AC current component). The EIS of the first battery can then be determined based on the extracted AC voltage and AC current components.

[0212] The above examples are merely illustrative. The specific method for determining the EIS of the first battery according to the voltage value sequence and the current value sequence may include but is not limited to the above examples, and this embodiment does not limit this.

[0213] In an embodiment of the present application, when the voltage value sequence and current value sequence of the first battery are sampled by the power-consuming device, the power-consuming device may not send the voltage value sequence and current value sequence to the charging device during the charging process, which can simplify the interaction process between the power-consuming device and the charging device.

[0214] The above are merely illustrative examples, and the method for the charging device to obtain the voltage value sequence and the current value sequence may include but is not limited to the above examples.

[0215] In an embodiment of the present application, when the charging device obtains the voltage value sequence and the current value sequence of the first battery under the action of the excitation signal in the process of inputting the excitation signal to the electrical device, and determines the EIS of the first battery based on the voltage value sequence and the current value sequence, it can be convenient for the charging device to obtain the EIS of the first battery in a timely manner when connected to the electrical device, so as to respond in a timely manner when it is determined that the first battery has an abnormality based on the EIS of the first battery.

[0216] Optionally, before inputting the excitation signal to the first battery, the method may further include: inputting a first identification signal to the first battery, where the first identification signal is used to identify that the excitation signal starts to be input to the first battery.

[0217] In one embodiment, before inputting the excitation signal to the first battery, the charging device may further input a first identification signal to the first battery. The first identification signal may be the same as or different from the excitation signal. The first identification signal is used to indicate the start of inputting the excitation signal to the first battery, i.e., the start of measuring the EIS of the first battery. The current value and voltage value at the same sampling time point are determined from the voltage value and current value corresponding to the excitation signal based on the first identification signal, so as to align the voltage value and current value corresponding to the excitation signal.

[0218] Exemplarily, after receiving the first instruction, the measurement module 32 first generates a first identification signal and inputs the first identification signal to the first battery 41, and then generates an excitation signal and inputs the excitation signal to the first battery 41. The interval between the first identification signal and the excitation signal can be set to 0.

[0219] Figure 9 shows another signal change diagram provided by an embodiment of the present application. The first identification signal is a single pulse signal, curve 73 is the current curve corresponding to the first identification signal, and curve 74 is the voltage curve corresponding to the first identification signal.

[0220] When the charging device 3 inputs the first identification signal to the first battery 41, the current sensor 351 can sample and obtain the current value corresponding to the first identification signal, such as the current value i0 shown in Figure 9. Similarly, the voltage sensor 352 can sample and obtain the voltage value corresponding to the first identification signal, such as the voltage value v0 shown in Figure 9.

[0221] Optionally, in the process of determining the electrochemical impedance spectrum of the first battery based on the voltage value sequence and the current value sequence, if the voltage value sequence includes voltage values ​​corresponding to the identification signal, a voltage value subsequence corresponding to the excitation signal can be determined from the voltage value sequence. Similarly, if the current value sequence includes current values ​​corresponding to the identification signal, a current value subsequence corresponding to the excitation signal can be determined from the current value sequence. The electrochemical impedance spectrum is then determined based on the voltage value subsequence and the current value subsequence.

[0222] For ease of distinction, in this embodiment, the current value corresponding to the first identification signal is referred to as the first current value, the voltage value corresponding to the first identification signal is referred to as the first voltage value, and the current value corresponding to the excitation signal is referred to as the second current value, and the voltage value corresponding to the excitation signal is referred to as the second voltage value.

[0223] Among them, the charging device 3 can determine the starting position of the second current value corresponding to the excitation signal in the current value sequence obtained by sampling the current sensor 351 based on the first current value corresponding to the first identification signal, and determine each second current value based on the starting position, thereby obtaining a current value subsequence composed of multiple second current values.

[0224] Similarly, the charging device 3 can determine the starting position of the second voltage value corresponding to the excitation signal in the voltage value sequence from the voltage value sequence sampled by the voltage sensor 352 based on the first voltage value corresponding to the first identification signal, and determine each second voltage value based on the starting position, thereby obtaining a voltage value subsequence consisting of multiple second voltage values.

[0225] As shown in FIG9 , the measurement module 32 outputs the excitation signal after outputting the first identification signal, so that the first current value corresponding to the first identification signal first appears in the current value sequence, and then the second current value corresponding to the excitation signal appears.

[0226] Exemplarily, the first identification signal is a single pulse signal with a constant amplitude, so the current sensor 351 can collect multiple consecutive current values, all of which are i0. In the entire current value sequence, the second current value i2 that appears after the consecutive occurrence of multiple identical first current values ​​i0 is the first second current value among all second current values ​​corresponding to the excitation signal, and the current values ​​following the second current value i2 are the other second current values ​​corresponding to the excitation signal. Therefore, the position of the second current value i2 in the current value sequence is the starting position of all second current values ​​corresponding to the excitation signal in the current value sequence, and the multiple second current values ​​following the second current value i2 constitute the current value subsequence corresponding to the excitation signal.

[0227] Similarly, when the measurement module 32 outputs the excitation signal after outputting the first identification signal, the voltage sensor 352 can collect multiple consecutive voltage values ​​v0. In the entire voltage value sequence sampled by the voltage sensor 352, the second voltage value v2 that appears after the consecutive occurrence of multiple identical first voltage values ​​v0 is the first second voltage value among all second voltage values ​​corresponding to the excitation signal, and the voltage values ​​after the second voltage value v2 are the other second voltage values ​​corresponding to the excitation signal. Therefore, the position of the second voltage value v2 in the voltage value sequence is the starting position of all second voltage values ​​corresponding to the excitation signal in the voltage value sequence, and the multiple second voltage values ​​after the second voltage value v2 constitute the voltage value subsequence corresponding to the excitation signal.

[0228] It should be noted that the current sensor 351 samples at a fixed sampling frequency, so there is a certain time interval between adjacent first current values ​​i0 and second current values ​​i2. Similarly, the voltage sensor 352 samples at a fixed sampling frequency, so there is a certain time interval between adjacent first voltage values ​​v0 and second voltage values ​​v2.

[0229] In this embodiment, in the process of determining the impedance of the first battery, the charging device can determine that the first current value in the current value subsequence and the first voltage value in the voltage value subsequence are the current value and voltage values ​​at the same sampling time point, and determine that the second current value in the current value subsequence and the second voltage value in the voltage value subsequence are the current value and voltage values ​​at the same sampling time point. Similarly, the second voltage value and the second current value at each sampling time point can be determined to achieve alignment of the second voltage value and the second current value.

[0230] Then, the charging device can calculate the ratio between the second voltage value and the second current value corresponding to each sampling time point, obtain the impedance value corresponding to each sampling time point, and obtain the EIS of the first battery 41 consisting of a series of impedance values.

[0231] In practical applications, the current sensor and voltage sensor each sample at a preset sampling frequency to obtain a series of current and voltage values. Because it is difficult to synchronize the sampling start time of the current sensor and voltage sensor with the time when the excitation signal begins to be input to the first battery, the current sensor and voltage sensor may sample voltage and current values ​​before the excitation signal enters the first battery.

[0232] Moreover, it is difficult to synchronize the sampling start times of the current sensor and the voltage sensor. Therefore, when the voltage and current values ​​corresponding to the same sampling time point are determined directly according to the position of the current value in the current value sequence and the position of the voltage value in the voltage value sequence, the determined set of voltage and current values ​​may not be the voltage and current values ​​at the same sampling time point.

[0233] For example, the first current value in a current sequence might be the current value at sampling time t1, and the first voltage value in a voltage sequence might be the voltage value at sampling time t2. These values ​​are not the same current and voltage values ​​at the same sampling time. If the impedance is calculated by directly using the first current value in the current sequence and the first voltage value in the voltage sequence as the voltage and current values ​​at the same time, the calculated impedance will be incorrect.

[0234] In an embodiment of the present application, when determining the EIS of the first battery, the charging device can determine the current value and voltage value at the same sampling time point corresponding to the excitation signal from the current value sequence and the voltage value sequence based on the voltage value and current value corresponding to the first identification signal, thereby achieving alignment of the voltage value and current value corresponding to the excitation signal, and determining the impedance of the battery based on the aligned voltage value and current value, so as to calculate a more accurate impedance and thus obtain a more accurate electrochemical impedance spectrum.

[0235] In one embodiment, the charging device 3 may output an excitation signal after a preset first interval duration has elapsed since outputting the first identification signal. In this case, within the entire current value sequence sampled by the current sensor 351, after multiple consecutive occurrences of the same first current value i0, the current value separated from the last first current value i0 by the first interval duration is the first of all second current values ​​corresponding to the excitation signal. The first interval duration can be set as desired and is not limited in this embodiment.

[0236] Similarly, when the charging device 3 outputs an excitation signal after outputting the first identification signal and after an interval of the first interval, in the entire voltage value sequence sampled by the voltage sensor 352, after multiple identical first voltage values ​​v0 appear consecutively, the voltage value separated from the last first voltage value v0 by the first interval is the first of all second voltage values ​​corresponding to the excitation signal.

[0237] Optionally, after inputting the excitation signal to the first battery, the method may further include: inputting a second identification signal to the first battery, where the second identification signal is used to indicate that inputting the excitation signal to the first battery is stopped.

[0238] In one embodiment, after inputting the excitation signal to the first battery, the charging device may further input a second identification signal to the first battery. The second identification signal may be the same as or different from the excitation signal. The second identification signal is used to indicate the cessation of inputting the excitation signal to the first battery, i.e., to indicate the cessation of measuring the EIS of the first battery. Voltage values ​​and current values ​​unrelated to the excitation signal are removed from the current value sequence and voltage value sequence based on the second identification signal.

[0239] Among them, after receiving the third instruction, the measurement module 32 can first stop inputting the excitation signal to the first battery 41, and then generate a second identification signal and input the second identification signal to the first battery 41. The interval between the excitation signal and the second identification signal can be set to 0.

[0240] Figure 10 shows another signal change diagram provided by an embodiment of the present application. The second identification signal is a single pulse signal, and curve 75 shown in Figure 10 is a current curve corresponding to the second identification signal, and curve 76 is a voltage curve corresponding to the second identification signal.

[0241] When the charging device 3 inputs the second identification signal to the first battery 41, the current sensor 351 can sample and obtain the current value corresponding to the second identification signal, such as the current value i3 shown in Figure 10. Similarly, the voltage sensor 352 can sample and obtain the voltage value corresponding to the second identification signal, such as the voltage value v3 shown in Figure 10.

[0242] For ease of distinction, the current value corresponding to the second identification signal may be referred to as a third current value, and the voltage value corresponding to the second identification signal may be referred to as a third voltage value.

[0243] In this embodiment, the second identification signal is input into the first battery 41 after the excitation signal stops, and the charging device 3 can determine the end position of the second current value corresponding to the excitation signal in the entire current value sequence obtained by sampling from the current sensor 351 based on the third current value corresponding to the second identification signal.

[0244] Similarly, the charging device 3 can determine the end position of the second voltage value corresponding to the excitation signal from the entire voltage value sequence sampled by the voltage sensor 352 based on the third voltage value corresponding to the second identification signal.

[0245] As shown in Figure 10, in the entire current value sequence sampled by the current sensor 351, the second current value i4 before the multiple identical third current values ​​i3 that appear continuously is the last second current value among all the second current values ​​corresponding to the excitation signal. The position of the second current value i4 in the entire current value sequence is the end position of the current value subsequence corresponding to the excitation signal in the entire current value sequence, and the multiple current values ​​before the end position are second current values.

[0246] Similarly, in the entire voltage value sequence sampled by the voltage sensor 352, the second voltage value v4 that appears before the multiple identical third voltage values ​​v3 that appear consecutively is the last second voltage value among all the voltage values ​​corresponding to the excitation signal. The position of the second voltage value v4 is the end position of the voltage value sequence corresponding to the excitation signal in the entire voltage value sequence, and the multiple voltage values ​​before the end position are second voltage values.

[0247] In this embodiment, when the charging device inputs the second identification signal to the first battery after the excitation signal is input to the first battery, the charging device 3, when calculating the EIS of the first battery, first determines the third current value from the current value sequence, removes the third current value and other current values ​​after the third current value, and obtains a current value subsequence. Similarly, the third voltage value and other voltage values ​​after the third voltage value can be removed from the voltage value sequence to obtain a voltage value subsequence.

[0248] As shown in FIG10 , in the process of calculating the EIS of the first battery, the charging device 3 can determine a plurality of consecutive third current values ​​i3 from the current value sequence, remove the third current value i3 and other current values ​​after the third current value i3 from the current value sequence, and remove the first current value i0 and the current values ​​before the first current value i0, to obtain a current value subsequence consisting of a plurality of consecutive second current values.

[0249] Similarly, a plurality of consecutive third voltage values ​​v3 can be determined from the voltage value sequence, and the third voltage value v3 and other voltage values ​​after the third voltage value v3 can be removed from the voltage value sequence, as well as the first voltage value v0 and the voltage value before the first voltage value v0, to obtain a voltage value subsequence consisting of a plurality of consecutive second voltage values.

[0250] In actual applications, the current sensor may sample the current value after the excitation signal stops, and the voltage sensor may sample the voltage value after the excitation signal stops input. If the impedance of the first battery is calculated based on the voltage value and current value after the excitation signal stops input, the calculated impedance is unrelated to the first battery, and the EIS of the first battery will include content unrelated to the first battery.

[0251] In an embodiment of the present application, the charging device inputs a second identification signal to the first battery after inputting an excitation signal to the first battery. When determining the EIS of the first battery, voltage values ​​unrelated to the excitation signal can be removed from a voltage value sequence based on the voltage value corresponding to the second identification signal, and current values ​​unrelated to the excitation signal can be removed from a current value sequence based on the current value corresponding to the second identification signal, so as to improve the accuracy of the current value and voltage value corresponding to the excitation signal, thereby obtaining a more accurate electrochemical impedance spectrum.

[0252] The above are merely illustrative examples. Specific methods for extracting a current value subsequence corresponding to an excitation signal from a current value sequence and methods for extracting a voltage value subsequence corresponding to an excitation signal from a voltage value sequence may include but are not limited to the above examples.

[0253] In the implementation of the present application, in the process of determining the electrochemical impedance spectrum based on the current value sequence and the voltage value sequence, a voltage value subsequence corresponding to the excitation signal is extracted from the voltage value sequence, and a current value subsequence corresponding to the excitation signal is extracted from the current value sequence. Since the current value subsequence and the voltage value subsequence are the voltage value and current value of the battery under the action of the excitation signal, the electrochemical impedance spectrum can be calculated based on the current value subsequence and the voltage value subsequence, and the introduction of other voltage values ​​and current values ​​can be avoided, thereby improving the accuracy of the electrochemical impedance spectrum.

[0254] In one embodiment, the charging device 3 may output the second identification signal after a preset second interval time interval after outputting the excitation signal. In this case, in the current value sequence sampled by the current sensor 351, the second and third current values ​​are separated by the second interval time interval.

[0255] Similarly, when the charging device 3 outputs the second identification signal after the second interval time interval after outputting the excitation signal, in the voltage value sequence sampled by the voltage sensor 352, the second interval time interval is between adjacent second voltage values ​​and third voltage values.

[0256] When determining the EIS of the first battery based on the current value sequence and the voltage value sequence, all third voltage values ​​in the voltage value sequence can be removed, and the voltage values ​​within the second interval before the third voltage value can be removed to obtain a voltage value subsequence. Similarly, all third current values ​​in the current value sequence can be removed, and the current values ​​within the second interval before the third voltage value can be removed to obtain a current value subsequence.

[0257] Optionally, the duration of the identification signal input by the charging device to the first battery is greater than or equal to a preset number of sampling periods of the excitation signal, where the preset number is, for example, 3.

[0258] The identification signal includes the first identification signal and the second identification signal in the above example. The sampling period of the excitation signal is the same as the sampling period of the current sensor and the voltage sensor in the above example. The current sensor and the voltage sensor are respectively used to sample the voltage and current of the first battery under the action of the excitation signal. The sampling period of the current sensor and the voltage sensor is the same as the sampling period of the excitation signal.

[0259] For example, when the sampling period of the current sensor is T, the duration of the first identification signal and the second identification signal is greater than or equal to 3T, such as 3T, 3.5T, 4T, 4.5T, and 5T. As shown in Figure 10, when the sampling period of the first identification signal and the second identification signal is not less than 3T, the number of first voltage values ​​v0 and first current values ​​i0 that can be sampled is not less than the number within three sampling periods. Similarly, the number of third voltage values ​​v3 and third current values ​​i3 that can be sampled is not less than the number within three sampling periods.

[0260] It is understandable that the specific value of the preset number can be set as needed, and this embodiment does not limit this. The duration of the first identification signal and the second identification signal can be set as needed, and this embodiment does not limit this.

[0261] In an embodiment of the present application, the duration of the identification signal input by the charging device to the first battery is not less than a preset number of sampling cycles of the excitation signal. When sampling the voltage and current corresponding to the excitation signal, the sampled current value sequence and voltage value sequence can include a larger number of voltage values ​​and current values ​​corresponding to the identification signal, so that the voltage values ​​and current values ​​corresponding to the identification signal and the excitation signal can be distinguished more accurately from the current value sequence and voltage value sequence.

[0262] Optionally, the identification signal input by the charging device to the first battery includes any one of a single pulse signal, a multi-pulse signal, a step signal, a triangular wave signal and a trapezoidal wave signal.

[0263] Exemplarily, the first identification signal and the second identification signal can be a single pulse signal as shown in Figures 9 and 10, or any one of a multi-pulse signal, a step signal, a triangular wave signal and a trapezoidal wave signal, or other forms of identification signals. This embodiment does not limit the specific forms of the first identification signal and the second identification signal.

[0264] In an embodiment of the present application, since the voltage values ​​and current values ​​corresponding to identification signals such as single-pulse signals, multi-pulse signals, step signals, triangular wave signals and trapezoidal wave signals are easy to identify, when the first identification signal and the second identification signal are one of the above signals, when extracting the voltage value subsequence and the current value subsequence from the voltage value sequence and the current value sequence, it is convenient to distinguish the voltage value corresponding to the identification signal and the voltage value corresponding to the excitation signal, and it is convenient to distinguish the current value corresponding to the identification signal and the current value corresponding to the excitation signal, so that the voltage value subsequence can be accurately extracted from the voltage value sequence, and the current value subsequence can be accurately extracted from the current value sequence.

[0265] Optionally, the step of inputting an excitation signal to the first battery in the electric device includes:

[0266] An excitation signal is input to the first battery at preset time intervals; or when the state of charge of the first battery reaches a preset threshold, the excitation signal is input to the first battery.

[0267] In one embodiment, after establishing an electrical connection with the first battery 41 in the electrical device 4, the charging device 3 can input an excitation signal to the first battery 41 when inputting a charging current to the first battery 41, so as to measure the electrochemical impedance spectrum of the first battery 41 during the charging process of the first battery 41.

[0268] For example, the first trigger condition can be set as the voltage conversion module 33 starting to input a charging current to the first battery. As shown in Figure 4, after sending the second instruction to the voltage conversion module 33, the control module 31 determines that the first trigger condition has been met and can send a first instruction to the measurement module 32. After receiving the first instruction, the measurement module 32 starts operating, inputs an excitation signal to the first battery 41, and begins measuring the EIS of the first battery 41.

[0269] For example, the second trigger condition can be set as the voltage conversion module 33 stopping inputting charging current to the first battery. As shown in Figure 4, after sending the fourth instruction to the voltage conversion module 33, the control module 31 determines that the second trigger condition has been met and can send a third instruction to the measurement module 32. After receiving the third instruction, the measurement module 32 stops operating and stops inputting the excitation signal to the first battery 41, thereby stopping measuring the EIS of the first battery 41.

[0270] The above is merely an example. After the charging device 3 is connected to the first battery 41 in the power-consuming device 4 , the charging device 3 may input an excitation signal to the first battery 41 at any time point and measure the EIS of the first battery 41 according to the excitation signal.

[0271] In some embodiments, if the charging device outputs an excitation signal when inputting a charging current to the first battery, the charging device may input an excitation signal to the first battery once every preset time period, and the duration of each output excitation signal may be set as required.

[0272] For example, the preset duration is T1 and the duration of the excitation signal is T2. After sending the second instruction to the voltage conversion module 33, the control module 31 determines that the first trigger condition has been met, sends the first instruction to the measurement module 32, and starts timing. After receiving the first instruction, the measurement module 32 begins inputting the excitation signal to the first battery 41.

[0273] When the timing reaches T2, the control module 31 sends a third instruction to the measurement module 32 and restarts timing. After receiving the third instruction, the measurement module 32 stops inputting the excitation signal to the first battery 41. When the timing reaches T1, the control module 31 again sends the first instruction to the measurement module 32, causing the measurement module 32 to input the excitation signal to the first battery 41 again and restart timing. Similarly, the excitation signal can be input to the first battery once every preset time period.

[0274] Similarly, after receiving the first instruction each time, the measurement module 32 may first input the first identification signal to the first battery, and then input the excitation signal to the first battery. Similarly, after receiving the third instruction each time, the measurement module 32 may first stop inputting the excitation signal to the first battery, and then input the second identification signal to the first battery.

[0275] In some embodiments, if the charging device outputs an excitation signal when inputting a charging current to the first battery, the charging device may input the excitation signal to the first battery when the state of charge of the first battery reaches a preset threshold.

[0276] For example, when the charging device 3 inputs charging current to the first battery 41, the control module 31 can communicate with the battery management system 43 in the power-consuming device to obtain the charge state of the first battery 41. When the charge state of the first battery 41 reaches a preset threshold, the control module 31 sends a first instruction to the measuring module 32. Upon receiving the first instruction, the measuring module 32 starts to input an excitation signal to the first battery.

[0277] In an embodiment of the present application, when measuring the electrochemical impedance spectrum of the first battery, the charging device can input an excitation signal to the first battery once every preset time period or input an excitation signal to the first battery when the state of charge of the first battery reaches a preset threshold value. This can reduce the time period for measuring the EIS of the first battery, thereby reducing the power consumption of the charging device.

[0278] In some embodiments, after establishing electrical connection with the first battery in the power-consuming device, the charging device may input an excitation signal to the first battery before starting to charge the first battery, so as to measure the electrochemical impedance spectrum of the first battery before starting to charge the first battery.

[0279] For example, the first trigger condition can be set as the establishment of an electrical connection between the charging device and the first battery. As shown in Figure 4, when the control module 31 detects that the charging output interface 37 is electrically connected to the charging input interface 42, it determines that the charging device 3 is electrically connected to the first battery 41, thus meeting the first trigger condition. At this point, the control module 31 can send a first instruction to the measurement module 32. Upon receiving the first instruction, the measurement module 32 starts operating and inputs an excitation signal to the first battery 41.

[0280] For example, the second trigger condition can be set to a measurement duration. The control module 31 starts timing when sending a first instruction to the measurement module 32. When the timing duration reaches the measurement duration, the second trigger condition is determined to have been met. At this point, the control module 31 sends a third instruction to the measurement module 32. Upon receiving the third instruction, the measurement module 32 stops inputting the excitation signal to the first battery 41. The measurement duration can be set as desired and is not limited in this embodiment.

[0281] When measuring the electrochemical impedance spectrum of the first battery 41 before charging the first battery 41, the control module 31 may send a second instruction to the voltage conversion module 33 after sending a third instruction to the measurement module 32. After receiving the second instruction, the voltage conversion module 33 starts operating, inputs a charging current to the first battery 41, and begins charging the first battery 41.

[0282] In another embodiment, the charging device 3 may input an excitation signal to the first battery 41 after charging of the first battery 41 is completed, so as to measure the electrochemical impedance spectrum of the first battery 41 after charging is stopped.

[0283] For example, the first trigger condition can be set to stop outputting the charging current. As shown in Figure 4, after detecting that the charging output interface 37 is electrically connected to the charging input interface 42, the control module 31 first sends a second instruction to the voltage conversion module 33. After receiving the second instruction, the voltage conversion module 33 starts operating and inputs the charging current to the first battery 41 to start charging the first battery.

[0284] During the charging process, the control module 31 communicates with the battery management system 43 in the power-consuming device 4 to determine whether the first battery 41 is fully charged. After determining that the first battery 41 is fully charged, the control module 31 sends a fourth instruction to the voltage conversion module 33. Upon receiving the fourth instruction, the voltage conversion module 33 ceases operation, thereby stopping the input of charging current to the first battery 41 and thus stopping charging the first battery 41.

[0285] After sending the fourth instruction to the voltage conversion module 33, the control module 31 determines that the first trigger condition has been met and sends the first instruction to the measurement module 32. After receiving the first instruction, the measurement module 32 starts operating, inputs an excitation signal to the first battery 41, and begins measuring the EIS of the first battery 41.

[0286] For example, the second trigger condition can be set as disconnection between the charging device 3 and the first battery 41. After sending the first instruction to the measurement module 32, if the control module 31 detects a disconnection between the charging output interface 37 and the charging input interface 42, it determines that the connection between the charging device 3 and the first battery 41 is disconnected, and the second trigger condition has been met. At this point, the control module 31 can send a third instruction to the signal transmitter 22. Upon receiving the third instruction, the measurement module 32 ceases operation and stops outputting the excitation signal.

[0287] Alternatively, the second trigger condition can be set to a measurement duration. When the control module 31 sends a first instruction to the measurement module 32, it begins timing. When the timing duration reaches the measurement duration, it determines that the second trigger condition has been met. At this point, the control module 31 sends a third instruction to the measurement module 32. Upon receiving the third instruction, the measurement module 32 stops inputting the excitation signal to the first battery 41. The measurement duration can be set as needed and is not limited in this embodiment.

[0288] It should be noted that, in the process of inputting an excitation signal to the first battery before or after charging the first battery, the charging device may also input an excitation signal to the first battery at preset time intervals, or input an excitation signal to the first battery when the state of charge of the first battery reaches a preset threshold. The specific method of inputting an excitation signal to the first battery may include but is not limited to the above examples.

[0289] In an embodiment of the present application, the charging device can input an excitation signal to the first battery before or after charging the first battery to measure the EIS of the first battery before or after charging the first battery. During the measurement process, because the sampled current and voltage values ​​are not affected by the charging current, a more accurate electrochemical impedance spectroscopy can be measured.

[0290] In one embodiment, after inputting an excitation signal to the first battery in the electrical device, the charging device can sample the current in the first battery circuit to obtain a current value sequence, and obtain a voltage value sequence of the first battery from the electrical device, and then determine the electrochemical impedance spectrum of the first battery based on the current value sequence and the voltage value sequence.

[0291] FIG11 is a schematic flow chart of another electrochemical impedance spectroscopy measurement method provided in an embodiment of the present application. The method can be performed by a charging device, for example, by a control module within the charging device. As shown in FIG11 , the method can include steps 111 to 114.

[0292] Step 111: The charging device inputs an excitation signal to the first battery in the power-consuming device.

[0293] Step 112: The charging device samples and obtains a current value sequence.

[0294] Step 113: The charging device obtains a voltage value sequence from the power-consuming device.

[0295] Figure 12 shows a schematic diagram of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application. In an electrical device, a battery management system 43 can manage a first battery 41 and continuously monitor the voltage across the first battery 41. When the first battery 41 comprises multiple cells connected in series and / or in parallel, the battery management system 43 can also continuously monitor the voltage across each cell in the first battery 41.

[0296] As shown in Figure 12, a communication connection 1 can be established between the charging device 3 and the power consumption device 4. The charging device 3 can obtain a voltage value sequence from the power consumption device 4 through the pre-established communication connection 1. For example, the communication connection 1 can be established between the charging device 3 and the power consumption device 4 via a controller area network (CAN), daisy chain communication, a telematics box, or other communication methods. The charging device 3 can communicate with the power consumption device 4 through the communication connection 1 and obtain the voltage value sequence from the power consumption device 4.

[0297] For another example, the charging device 3 can establish a communication connection 2 with the server 5 via the Internet, and the power consumption device 4 can establish a communication connection 3 with the server 5 via the Internet. The charging device 3 and the power consumption device 4 can interact with each other via the communication connection 2 and the communication connection 3. After obtaining the voltage value sequence, the power consumption device 4 can send the voltage value sequence to the server 5, and the server 5 sends the voltage value sequence to the power consumption device 4.

[0298] The above are merely illustrative examples, and specific communication methods between the charging device 3 and the power-consuming device 4 include but are not limited to the above examples.

[0299] In one embodiment, the charging device 3 obtains only one voltage value sequence from the power consumption device 4. The voltage values ​​in this voltage value sequence are the voltage values ​​across the first battery 41. After the charging device 3 establishes an electrical connection with the first battery 41, the power consumption device 4 samples the voltage across the first battery 41 at a preset sampling frequency to obtain the voltage value sequence. After sampling and obtaining the voltage value sequence, the power consumption device 4 may send the voltage value sequence to the charging device 3 via communication connection 1. Alternatively, the power consumption device 4 may send the voltage value sequence to the charging device 3 via communication connection 2 and communication connection 3.

[0300] In another embodiment, the charging device 3 obtains multiple voltage value sequences from the power-consuming device 4, each of which corresponds to a cell in the first battery 41. The voltage values ​​in the voltage value sequence represent the voltage across the corresponding cell. For example, when the first battery 41 includes N cells, the power-consuming device 4 can sample the voltage across each cell at a preset sampling frequency to obtain a voltage value sequence corresponding to each cell, resulting in a total of N voltage value sequences. After obtaining these N voltage value sequences, the power-consuming device 4 can send these N voltage value sequences to the charging device 3.

[0301] It should be noted that the power-consuming device 4 may also only sample the voltages across some of the battery cells, and obtain and send a corresponding voltage value sequence to the charging device 3 .

[0302] In another embodiment, the charging device 3 can obtain the voltage value sequence corresponding to each battery cell from the power consumption device 4, and simultaneously obtain the voltage value sequence across the first battery 41 from the power consumption device 4. For example, when the first battery 41 includes N battery cells, the battery management system 43 can obtain the voltage value sequence of each battery cell and the voltage value sequence across the first battery 41, thereby obtaining (N+1) voltage value sequences, and sending the (N+1) voltage value sequences to the charging device 3.

[0303] Among them, when the voltage value sequence is obtained by sampling the power device 4, the charging device 3 can also obtain the current value sequence by sampling the current value of the input charging output interface 37 through the current sensor at a preset sampling frequency. The sampling frequencies of the charging device 3 and the power device 4 are the same.

[0304] Similarly, when obtaining the voltage value sequence through the power-consuming device 4, the charging device 3 can input the first identification signal to the first battery 41 before inputting the excitation signal to the first battery 41, and input the second identification signal to the first battery 41 after inputting the excitation signal to the first battery.

[0305] Step 114 : The charging device determines an electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0306] In this embodiment, after the charging device 3 obtains a voltage value sequence consisting of voltage values ​​at both ends of the first battery 41 from the power-consuming device 4, it can determine the EIS of the first battery based on the obtained voltage value sequence and the sampled current value sequence. The EIS is the electrochemical impedance spectrum of the entire first battery 41.

[0307] When the charging device 3 obtains the voltage value sequence corresponding to the cells in the first battery 41 from the power consumption device 4 , the charging device 3 can determine EIS according to the voltage value sequence and current value sequence corresponding to the cells. The EIS is the electrochemical impedance spectrum of the cells.

[0308] It is understood that when the power-consuming device 4 sends multiple voltage value sequences to the charging device 3, the charging device 3 can determine an electrochemical impedance spectrum based on each voltage value sequence and current value sequence. When the voltage value sequence is the voltage value sequence across the first battery 41, the electrochemical impedance spectrum is the electrochemical impedance spectrum across the first battery 41; when the voltage value sequence is the voltage value sequence across a single cell in the first battery 41, the electrochemical impedance spectrum is the electrochemical impedance spectrum of the cell.

[0309] In an embodiment of the present application, a voltage value sequence can be obtained through an electrical device. Since the electrical device can obtain the voltage value sequence corresponding to the battery cells in the first battery, the electrochemical impedance spectrum of the battery cells can be determined based on the voltage value sequence, and the state of the first battery can be accurately determined to the battery cell, thereby achieving a more accurate judgment of the state of the first battery.

[0310] In one embodiment, the current value sequence can also be obtained by the power-consuming device 4 and sent to the charging device 3. As shown in FIG12 , the battery management system 43 can sample the current input to the first battery 41 at a preset sampling frequency to obtain a current value sequence, and send the current value sequence to the charging device 3.

[0311] In another embodiment, after inputting an excitation signal to the first battery 41 in the power-consuming device 4, the charging device 3 can sample the current in the circuit of the first battery 41 to obtain a current value sequence and send the current value sequence to the server 5. Simultaneously, the power-consuming device 4 can obtain a voltage value sequence of the first battery 41 and send the voltage value sequence to the server 5. After receiving the voltage value sequence and the current value sequence, the server 5 can determine the electrochemical impedance spectrum of the first battery 41 based on the current value sequence and the voltage value sequence.

[0312] In one embodiment, both the current value sequence and the voltage value sequence can be sampled by the power-consuming device 4 and then sent to the charging device. For example, the power-consuming device 4 can also be provided with a current sensor and a voltage sensor. The current sensor can sample the current input to the first battery at a preset sampling frequency to obtain a current value sequence, and the voltage sensor can sample the voltage across the first battery at a preset sampling frequency to obtain a voltage value sequence.

[0313] In another embodiment, one of the current value sequence and the voltage value sequence of the first battery is sampled by the charging device 3, and the other is sampled by the power consumption device 4 and then sent to the charging device 3. For example, the current value sequence can be sampled by a current sensor in the charging device 3, and the voltage value sequence can be sampled by a voltage sensor in the power consumption device 4 and then sent to the charging device 3. The method for the charging device to obtain the voltage value sequence and the current value sequence may include but is not limited to the above examples.

[0314] In the embodiment of the present application, when the voltage and current value sequences of the first battery are sampled by an electrical device, the voltage and current values ​​sampled by the electrical device are more accurate, thereby improving the EIS calculated from the voltage and current value sequences. When one of the voltage and current value sequences is sampled by the electrical device and the other by the charging device, the sampling method of the voltage and current values ​​can be flexibly set according to needs.

[0315] In one embodiment, the charging device may send the acquired current value sequence and / or voltage value sequence of the first battery to the server.

[0316] This embodiment provides a measurement system, including a charging device, an electric device, and a server; the charging device is used to input an excitation signal to a first battery in the electric device, the server is used to obtain a current value sequence and a voltage value sequence, and the server is also used to determine an electrochemical impedance spectrum based on the current value sequence and the voltage value sequence.

[0317] FIG13 is a flow chart of another method for measuring electrochemical impedance spectroscopy provided in an embodiment of the present application. As shown in FIG13 , the method may include steps 131 to 136 .

[0318] Step 131: The charging device inputs an excitation signal to the first battery in the power-consuming device.

[0319] Step 132: The charging device samples and obtains a current value sequence.

[0320] Step 133: Sampling the electrical device to obtain a voltage value sequence.

[0321] Step 134: The charging device sends a current value sequence to the server.

[0322] Step 135: The electrical device sends a voltage value sequence to the server.

[0323] Figure 14 shows a schematic diagram of the structure of another electrochemical impedance spectroscopy measurement system provided in an embodiment of the present application. After connecting to the first battery 41, the charging device 3 can sample the current output to the charging output interface 37 to obtain a current value sequence. After obtaining the current value sequence, the charging device 3 sends the current value sequence to the server 5 via the communication connection 2.

[0324] In the process of sending the current value sequence to the server 5 , the charging device 3 may first send the current value sequence to the power-consuming device 4 , and then the power-consuming device 4 forwards the current value sequence to the server 5 .

[0325] As shown in FIG14 , the electric device 4 can sample the voltage across the first battery 41 to obtain a voltage value sequence and / or sample the voltage across each cell in the first battery 41 to obtain a voltage value sequence for each cell. After obtaining the voltage value sequence, the electric device 4 sends the voltage value sequence to the server 5 via the communication connection 3 .

[0326] In some embodiments, when the electric device 4 sends the voltage value sequence to the server 5 , it may first send the voltage value sequence to the charging device 3 , and then the charging device 3 forwards the voltage value sequence to the server 5 .

[0327] Step 136: The server determines an electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0328] The method for the server to determine the electrochemical impedance spectrum according to the voltage value sequence and the current value sequence can be referred to the charging device, which is not described in detail in this embodiment.

[0329] In an embodiment of the present application, the charging device sends one or both of the voltage value sequence and the current value sequence to the server, and the server determines the electrochemical impedance spectrum of the first battery based on the current value sequence and the voltage value sequence, which can reduce the calculation amount of the charging device.

[0330] In this embodiment, when the charging device 3 sends a current value sequence to the server 5, it can mark the current value sequence as corresponding to the first battery 41. Similarly, when the power-consuming device 4 sends a voltage value sequence to the server 5, it can also mark the voltage value sequence as the voltage value sequence of the first battery 41. When calculating the electrochemical impedance spectrum, the server 5 determines the electrochemical impedance spectrum of the first battery 41 based on the identically marked voltage value sequence and current value sequence. The method for marking the current value sequence and voltage value sequence can be specifically configured as needed and is not limited in this embodiment.

[0331] In the embodiment of the present application, a charging device inputs an excitation signal to a battery in an electrical device, and a server determines an electrochemical impedance spectrum based on the voltage value sequence and current value requirements of the first battery. This eliminates the need for a separate detection device for the battery, thereby reducing the cost of measuring the electrochemical impedance spectrum. Furthermore, direct calculation and determination of the electrochemical impedance spectrum by the server facilitates the server's determination of the battery status in the electrical device based on the electrochemical impedance spectrum, enabling effective management of the electrical device based on the battery's configuration.

[0332] Optionally, in the case where the charging device 3 inputs an excitation signal to the first battery 41 when inputting a charging current to the first battery 41, the server 5 can extract the AC voltage component from the voltage value sequence and the AC current component from the current value sequence when determining the EIS based on the voltage value sequence and the current value sequence, and determine the EIS based on the AC voltage component and the AC current component.

[0333] Optionally, when the charging device 3 inputs an excitation signal to the first battery 41 before or after inputting the charging current to the first battery 41, the charging device 3 and the power-consuming device 4 may only send to the server 4 the current value sequence and the voltage value sequence sampled when the excitation signal is input to the first battery 41, and the server 5 may directly determine the EIS based on the current value sequence and the voltage value sequence.

[0334] In one embodiment, the charging device can send a current value sequence and a voltage value sequence to the server. For example, when the power consumption device 4 sends the voltage value sequence to the server 5, it can first send the voltage value sequence to the charging device 3, which then forwards the voltage value sequence to the server 5. Alternatively, the charging device 3 can sample the current value sequence and the voltage value sequence, and then send the current value sequence and the voltage value sequence to the server 5.

[0335] In practical applications, the charging device 3 can sample a current value sequence and send the current value sequence to the server 5, and the power consumption device 4 can sample a voltage value sequence and send the voltage value sequence to the server 5. Alternatively, the charging device 3 can sample a current value sequence and a voltage value sequence and send the current value sequence and the voltage value sequence to the server 5. Alternatively, the power consumption device 4 can sample a current value sequence and a voltage value sequence and send the current value sequence and the voltage value sequence to the server 5.

[0336] In an embodiment of the present application, a charging device inputs an excitation signal to a battery in an electrical device, and the electrochemical impedance spectrum of the battery is determined based on the excitation signal. When measuring the electrochemical impedance spectrum of the battery, there is no need to configure a separate detection device for the battery, which can reduce the cost of measuring the electrochemical impedance spectrum. In addition, the connection between the charging device and the electrical device is a conventional connection, which is relatively simple to operate. Therefore, the EIS measurement method provided in the embodiment of the present application has high practical application capabilities.

[0337] At the same time, the electrochemical impedance spectroscopy measurement method and charging device provided in the embodiments of the present application can measure the electrochemical impedance spectrum of the battery each time the battery is charged, and can frequently obtain the electrochemical impedance spectrum of the battery, so that when an abnormality occurs in the battery, the abnormality of the battery can be discovered in time according to the electrochemical impedance spectrum.

[0338] This embodiment provides a measurement system, including a charging device and an electrical device; the charging device is used to input an excitation signal to a first battery in the electrical device, the electrical device is used to obtain a current value sequence and a voltage value sequence, and the electrical device is also used to determine an electrochemical impedance spectrum based on the current value sequence and the voltage value sequence.

[0339] FIG15 is a schematic flow chart of another method for measuring electrochemical impedance spectroscopy provided in an embodiment of the present application. As shown in FIG15 , the method may include steps 151 to 156 .

[0340] Step 151: The charging device inputs an excitation signal to the first battery in the power-consuming device.

[0341] Step 152: The charging device samples and obtains a current value sequence.

[0342] Step 153: The electrical device samples to obtain a voltage value sequence.

[0343] Step 154: The charging device sends a current value sequence to the server.

[0344] Step 155: The server sends the current value sequence to the electrical device.

[0345] It is understandable that the charging device can also directly establish a communication connection with the charging device and directly send the current value sequence to the power-consuming device. Alternatively, the power-consuming device can directly sample and obtain the current value sequence.

[0346] Step 156: The electrical device determines an electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0347] The method for determining the electrochemical impedance spectrum of the electrical device according to the voltage value sequence and the current value sequence can refer to the charging device, which will not be described in detail in this embodiment.

[0348] In the embodiments of the present application, a charging device inputs an excitation signal to a battery in a power-consuming device, and the power-consuming device determines the electrochemical impedance spectrum based on the voltage value sequence and current value requirements. This eliminates the need for a separate detection device for the battery, thereby reducing the cost of electrochemical impedance spectroscopy measurement. Furthermore, direct calculation and determination of the electrochemical impedance spectrum by the power-consuming device facilitates timely acquisition of battery status based on the electrochemical impedance spectrum and adjustment of charging strategies.

[0349] Optionally, the method may further include: outputting status information of the first battery, where the status information is determined according to electrochemical impedance spectroscopy.

[0350] In this embodiment, after the EIS of the first battery is determined, the state information of the first battery may be determined according to the EIS of the first battery, and then the state information of the first battery may be output.

[0351] Exemplarily, in the process of determining the state information of the first battery based on the electrochemical impedance spectroscopy, a Nyquist plot can be drawn based on the measured electrochemical impedance spectrum, and the ohmic resistance, charge transfer resistance, electrode interface double layer capacitance and Weber parameters of the first battery can be determined through the Nyquist plot. The diffusion coefficient of the electrode material in the first battery can be estimated based on the Weber parameters.

[0352] The above are merely illustrative examples. The status information may also include the internal temperature, capacity, SOC, and SOH of the first battery, as well as information about the conductivity of the electrode material in the first battery. The specific method for determining the status information based on the electrochemical impedance spectroscopy can be set as needed and is not limited in this embodiment.

[0353] After the charging device 3 and / or the power consumption device 4 determines the EIS based on the voltage value sequence and the current value sequence, the EIS can be sent to the server 5, which then determines the status information of the first battery 41 based on the EIS and outputs the status information. Alternatively, the charging device 3 and / or the power consumption device 4 can directly determine the status information of the first battery 41 based on the EIS and output the status information.

[0354] After the server 5 determines the EIS based on the voltage value sequence and the current value sequence, it can send the EIS to the charging device 3 and / or the power consumption device 4. The charging device 3 and / or the power consumption device 4 can then determine the status information of the first battery 41 based on the EIS and output the status information. Alternatively, the server 5 can directly determine the status information of the first battery 41 based on the EIS and output the status information.

[0355] For example, if the charging device 3 has a display screen, the charging device 3 can output the status information of the first battery via the display screen. Alternatively, the charging device 3 can also communicate with the power consumption device 4 and output the status information of the first battery to the power consumption device 4. Alternatively, the charging device 3 can also communicate with a user's terminal device (e.g., a mobile phone) and output the status information of the first battery to the user's terminal device.

[0356] For example, after determining the status information of the first battery 41 , the server 5 may send the status information to the charging device 3 and / or the power consumption device 4 , and the charging device 3 and / or the power consumption device 4 output the status information.

[0357] In one embodiment, the power-consuming device 4 can also send parameters such as identification information, SOC and battery type of the first battery 41 to the charging device 3 and / or server 5. The charging device and server can output relevant parameters of the first battery while outputting status information.

[0358] The above are merely illustrative examples, and specific methods for outputting status information may include but are not limited to the above examples.

[0359] In the embodiment of the present application, after determining the electrochemical impedance spectrum of the first battery, status information of the first battery can be output based on the electrochemical impedance spectrum of the first battery. Because the status of the first battery can be accurately determined based on the electrochemical impedance spectrum, relatively accurate status information can be output based on the electrochemical impedance spectrum, making it easier for a user to determine the status of the first battery based on the status information.

[0360] Optionally, the method may further include: adjusting a charging strategy of the first battery according to the electrochemical impedance spectroscopy.

[0361] In this embodiment, if the charging device 3 inputs an excitation signal to the first battery 41 before inputting a charging current to the first battery 41, the ESI of the first battery 41 can be obtained before charging the first battery 41. In this case, the charging strategy of the first battery 41 can be adjusted according to the EIS of the first battery 41.

[0362] If the charging device 3 inputs an excitation signal to the first battery 41 while inputting a charging current to the first battery 41, the ESI of the first battery 41 can also be obtained during the charging process of the first battery 41. In this case, the charging strategy of the first battery 41 can be adjusted according to the EIS of the first battery 41.

[0363] When the charging device 3 determines the EIS based on the voltage value sequence and the current value sequence, the charging device 3 can directly adjust the charging strategy of the first battery 41 based on the EIS. When the server 5 determines the EIS based on the voltage value sequence and the current value sequence, the server 5 can send the EIS to the charging device 3 and / or the power device 4, and the charging device 3 and / or the power device 4 can adjust the charging strategy of the first battery 41 based on the received EIS.

[0364] For example, after obtaining the EIS of the first battery, the charging device 3 or the power-consuming device 4 may determine that the internal temperature of the first battery 41 is too high based on the EIS. For another example, after obtaining the EIS of the first battery, the charging device 3 or the power-consuming device 4 may determine the diffusion rate of the first battery based on the EIS. If it is determined that the diffusion rate of the first battery has decreased, the charging current of the first battery 41 may be reduced.

[0365] In one embodiment, after determining the EIS of the first battery 41, the server 5 may set a charging policy for the first battery 41 based on the EIS, and then the server 5 may send the charging policy for the first battery 41 to the charging device 3 or the power consumption device 4. After receiving the charging policy sent by the server 5, the charging device 3 or the power consumption device 4 charges the first battery 41 according to the charging policy, thereby enabling the server 5 to indirectly adjust the charging policy for the first battery 41.

[0366] In this embodiment, if the charging device 3 inputs an excitation signal to the first battery 41 after inputting a charging current to the first battery 41, the ESI of the first battery 41 can only be obtained after charging the first battery 41. In this case, the charging device 3 can record the EIS of the first battery 41 and adjust the electrochemical impedance spectroscopy of the first battery 41 based on the recorded EIS when the first battery 41 is next connected.

[0367] The above examples are merely illustrative, and methods for adjusting the charging strategy of the first battery according to the electrochemical impedance spectroscopy may include but are not limited to the above examples.

[0368] In the embodiment of the present application, after determining the electrochemical impedance spectrum of the first battery, the charging strategy of the first battery can be adjusted based on the electrochemical impedance spectrum of the first battery. Because the state of the first battery can be determined relatively accurately based on the electrochemical impedance spectrum, adjusting the charging strategy of the first battery based on the electrochemical impedance spectrum can more accurately control the charging process of the first battery.

[0369] An embodiment of the present application further provides an electrochemical impedance spectroscopy measuring device, wherein the charging device is, for example, the charging device in the above example, and the charging device includes a measuring module, which is used to input an excitation signal to a first battery in the power-consuming device.

[0370] In one embodiment, the measuring module is further configured to input an identification signal to the first battery.

[0371] In one embodiment, the measuring module is specifically configured to input an excitation signal to the first battery at preset time intervals; or input an excitation signal to the first battery when the state of charge of the first battery reaches a preset threshold.

[0372] In one embodiment, the measuring device further comprises:

[0373] an acquisition module, configured to acquire a current value sequence and a voltage value sequence of the first battery;

[0374] The determination module is used to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

[0375] In one embodiment, the measuring device further includes: an adjustment module, configured to adjust a charging strategy of the first battery according to the electrochemical impedance spectroscopy.

[0376] In one embodiment, the measuring device further includes: an output module, configured to output status information of the first battery, where the status information is determined according to electrochemical impedance spectroscopy.

[0377] In one embodiment, the measuring device further includes: a sending module, configured to send the acquired current value sequence and / or voltage value sequence of the first battery to a server.

[0378] In one embodiment, the measurement module includes a signal generator, which is configured to generate an excitation signal and input the excitation signal to the first battery.

[0379] In one embodiment, the device further includes a power supply and a voltage conversion module; the input end of the voltage conversion module is connected to the power supply, and the output end is used to connect to the first battery, for converting the voltage of the power supply to obtain and input a charging current to the first battery.

[0380] In one embodiment, the power source comprises a second battery.

[0381] FIG16 shows a schematic structural diagram of an electrochemical impedance spectroscopy measuring device provided in an embodiment of the present application. The electrochemical impedance spectroscopy measuring device 16 can be provided in the server and charging device in the above example, and includes an acquisition module 161 and a determination module 162 .

[0382] an acquisition module 161 configured to acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes current values ​​of the first battery in the electrical device during the process of inputting an excitation signal into the first battery, and the voltage value sequence includes voltage values ​​of the first battery during the process of inputting the excitation signal into the first battery, wherein the excitation signal is input into the first battery by the charging device;

[0383] The determination module 162 is configured to determine the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence.

[0384] In one embodiment, the measuring device further includes: an adjustment module, configured to adjust a charging strategy of the first battery according to the electrochemical impedance spectroscopy.

[0385] In one embodiment, the measuring device further includes: an output module, configured to output status information of the first battery, where the status information is determined according to electrochemical impedance spectroscopy.

[0386] The present invention also provides an electrochemical impedance spectroscopy (EIS) measurement device. Figure 17 is a block diagram of the structure of an EIS measurement device provided in an embodiment of the present invention. As shown in Figure 17, the EIS measurement device 17 includes a processor 171 and a memory 173. The processor 171 and the memory 173 can be connected via one or more buses 174.

[0387] The electrochemical impedance spectroscopy measuring device 17 also includes a computer program 172, which is stored in a memory 173. When executed by the processor 171, the electrochemical impedance spectroscopy measuring device 17 performs the electrochemical impedance spectroscopy measuring method described in the above example. All relevant details of each step involved in the above method embodiment can be referenced in the functional description of the corresponding physical device and are not further described here.

[0388] An embodiment of the present application further provides a readable storage medium, which includes a computer program. When the computer program is run on a computer, the computer executes the method provided in the above method embodiment.

[0389] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method provided in the above method embodiment.

[0390] An embodiment of the present application also provides a chip system, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a network device equipped with the chip system executes the method provided in the above method embodiment.

[0391] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0392] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0393] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0394] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments provided herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0395] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0396] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0397] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0398] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0399] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0400] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for measuring electrochemical impedance spectroscopy, wherein: The method comprises: Inputting an excitation signal to a first battery in the electrical device, wherein the excitation signal is used to measure an electrochemical impedance spectrum of the first battery; Acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery; An electrochemical impedance spectrum of the first battery is determined based on the current value sequence and the voltage value sequence.

2. The method of claim 1, wherein: The step of determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence includes: In a case where the voltage value sequence includes the voltage value corresponding to the identification signal, determining a voltage value subsequence corresponding to the excitation signal from the voltage value sequence; In a case where the current value sequence includes the current value corresponding to the identification signal, determining a current value subsequence corresponding to the excitation signal from the current value sequence; The electrochemical impedance spectrum is determined according to the voltage value subsequence and the current value subsequence.

3. The method according to claim 1 or 2, wherein: After determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence, the method further includes: A charging strategy of the first battery is adjusted according to the electrochemical impedance spectrum.

4. The method according to any one of claims 1 to 3, wherein: After determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence, the method further includes: Outputting state information of the first battery, wherein the state information is determined according to the electrochemical impedance spectroscopy.

5. A system for measuring electrochemical impedance spectroscopy, wherein: The measuring system comprises: a charging device and an electricity-consuming device; The charging device is used to input an excitation signal to the first battery in the power-consuming device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery; The charging device is further used to obtain a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery; The charging device is further used to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

6. The measuring system of claim 5, wherein: The charging device is specifically used to obtain, from the power-consuming device, the current value sequence and the voltage value sequence sampled by the power-consuming device; Alternatively, the charging device is specifically used to obtain from the power-consuming device one of the current value sequence and the voltage value sequence sampled by the power-consuming device, and sample the other of the current value sequence and the voltage value sequence; Alternatively, the charging device is specifically used to sample and obtain the current value sequence and the voltage value sequence.

7. A system for measuring electrochemical impedance spectroscopy, wherein: The measuring system comprises: a charging device and an electricity-consuming device; The charging device is used to input an excitation signal to the first battery in the power-consuming device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery; The power consumption device is used to obtain a current value sequence and a voltage value sequence, wherein the current value sequence includes the excitation signal the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery; The electrical device is further used to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

8. The measuring system of claim 7, wherein: The power-consuming device is specifically used to obtain, from the charging device, the current value sequence and the voltage value sequence sampled by the charging device; Alternatively, the power-consuming device is specifically used to obtain from the charging device one of the current value sequence and the voltage value sequence sampled by the charging device, and sample the other of the current value sequence and the voltage value sequence; Alternatively, the electrical device is specifically used to sample and obtain the current value sequence and the voltage value sequence.

9. A system for measuring electrochemical impedance spectroscopy, wherein: The measurement system comprises: a charging device, a power consumption device and a server; The charging device is used to input an excitation signal to the first battery in the power-consuming device, and the excitation signal is used to measure the electrochemical impedance spectrum of the first battery; The server is used to obtain a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery during the process of the excitation signal being input into the first battery, and the voltage value sequence includes the voltage value of the first battery during the process of the excitation signal being input into the first battery; The server is further configured to determine the electrochemical impedance spectrum according to the current value sequence and the voltage value sequence.

10. The measurement system of claim 9, wherein: The server is specifically configured to obtain the current value sequence and the voltage value sequence from the charging device or the power-consuming device; Alternatively, the server is specifically used to obtain one of the current value sequence and the voltage value sequence sampled by the charging device from the charging device, and to obtain the other of the current value sequence and the voltage value sequence sampled by the power user from the power user.

11. The measuring system according to any one of claims 7 to 10, wherein: The charging device comprises a measuring module, and the measuring module is used to connect to the first battery to input the excitation signal to the first battery.

12. The measurement system of claim 11, wherein: The measurement module comprises a signal generator for generating the excitation signal.

13. The measuring system according to any one of claims 7 to 12, wherein: The charging device also includes a power supply and a voltage conversion module; The input end of the voltage conversion module is connected to the power supply, and the output end is used to connect to the first battery, so as to convert the voltage of the power supply to obtain and input a charging current to the first battery.

14. The measurement system of claim 13, wherein: The power source includes a second battery.

15. A method for measuring electrochemical impedance spectroscopy, wherein: Applied to a charging device, the method comprises: Inputting an excitation signal to a first battery in the electric device; The excitation signal is used to measure the electrochemical impedance spectrum of the first battery.

16. The method of claim 15, wherein: Before inputting the excitation signal to the first battery in the electric device, the method further includes: A first identification signal is input to the first battery, wherein the first identification signal is used to identify the start of the input of the excitation signal. Insert the first battery.

17. The method according to claim 15 or 16, wherein: After inputting the excitation signal to the first battery in the electric device, the method further includes: A second identification signal is input to the first battery, where the second identification signal is used to indicate that the input of the excitation signal to the first battery is stopped.

18. The method according to claim 16 or 17, wherein: The duration of the identification signal input by the charging device to the first battery is greater than or equal to a preset number of sampling periods of the excitation signal.

19. The method of claim 18, wherein: The preset number is 3.

20. The method of any one of claims 16 to 19, wherein: The identification signal input by the charging device to the first battery includes any one of a single pulse signal, a multi-pulse signal, a step signal, a triangular wave signal and a trapezoidal wave signal.

21. The method of any one of claims 15 to 20, wherein: The step of inputting an excitation signal to a first battery in the electric device comprises: Inputting an excitation signal to the first battery at preset time intervals; Alternatively, when the state of charge of the first battery reaches a preset threshold, the excitation signal is input to the first battery.

22. The method of any one of claims 15 to 21, wherein: The method further comprises: Acquiring a current value sequence and a voltage value sequence of the first battery; The electrochemical impedance spectrum is determined based on the current value sequence and the voltage value sequence.

23. The method of claim 22, wherein: The obtaining of the current value sequence and the voltage value sequence of the first battery includes: Acquire, from the electrical device, the current value sequence and the voltage value sequence sampled by the electrical device; Alternatively, one of the current value sequence and the voltage value sequence sampled by the electrical device is obtained from the electrical device, and the other of the current value sequence and the voltage value sequence is obtained by sampling; Alternatively, the current value sequence and the voltage value sequence are obtained by sampling.

24. The method of any one of claims 15 to 21, wherein: The method further comprises: The acquired current value sequence and / or voltage value sequence of the first battery is sent to a server.

25. A method for measuring electrochemical impedance spectroscopy, wherein: The method comprises: Acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes the current value of the first battery in the process of inputting an excitation signal into the first battery in the electrical device, and the voltage value sequence includes the voltage value of the first battery in the process of inputting the excitation signal into the first battery, wherein the excitation signal is input into the first battery by a charging device; An electrochemical impedance spectrum of the first battery is determined based on the current value sequence and the voltage value sequence.

26. The method of claim 25, wherein: The step of determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence includes: In a case where the voltage value sequence includes the voltage value corresponding to the identification signal, determining a voltage value subsequence corresponding to the excitation signal from the voltage value sequence; In a case where the current value sequence includes the current value corresponding to the identification signal, determining a current value subsequence corresponding to the excitation signal from the current value sequence; The electrochemical impedance spectrum is determined according to the voltage value subsequence and the current value subsequence.

27. The method of claim 25 or 26, wherein: The method is applied to a server, and obtaining a current value sequence and a voltage value sequence includes: Acquire the current value sequence and the voltage value sequence from the power-consuming device or the charging device; Alternatively, the current value sequence is obtained from one of the power-consuming device and the charging device, and the voltage value sequence is obtained from the other one.

28. The method of any one of claims 25 to 27, wherein: After determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence, the method further includes: A charging strategy of the first battery is adjusted according to the electrochemical impedance spectrum.

29. The method of any one of claims 25 to 28, wherein: After determining the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence, the method further includes: Outputting state information of the first battery, wherein the state information is determined according to the electrochemical impedance spectroscopy.

30. A device for measuring electrochemical impedance spectroscopy, wherein: The device comprises a measuring module; The measuring module is used to input an excitation signal to a first battery in the electrical device; The excitation signal is used to measure the electrochemical impedance spectrum of the first battery.

31. The apparatus of claim 30, wherein: The measurement module comprises a signal generator for generating the excitation signal.

32. The device of claim 30 or 31, wherein: The device also includes a power supply and a voltage conversion module; The input end of the voltage conversion module is connected to the power supply, and the output end is used to connect to the first battery, so as to convert the voltage of the power supply to obtain and input a charging current to the first battery.

33. The apparatus of claim 32, wherein: The power source includes a second battery.

34. A device for measuring electrochemical impedance spectroscopy, wherein: The measuring device of the electrochemical impedance spectroscopy comprises: an acquisition module, configured to acquire a current value sequence and a voltage value sequence, wherein the current value sequence includes a current value of a first battery in an electrical device during a process in which an excitation signal is input into the first battery, and the voltage value sequence includes a voltage value of the first battery during a process in which the excitation signal is input into the first battery, wherein the excitation signal is input into the first battery by a charging device; A determination module is used to determine the electrochemical impedance spectrum of the first battery according to the current value sequence and the voltage value sequence.

35. A readable storage medium, wherein: The readable storage medium is used to store a computer program. When the computer program is executed by the electrochemical impedance spectroscopy measuring device, the electrochemical impedance spectroscopy measuring device performs the method according to any one of claims 1 to 4 or 15 to 29.

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