Battery protection method and device, electronic equipment, medium and computer program product

Abstract

The invention relates to a battery protection method and device, electronic equipment, a medium and a computer program product. The method comprises the following steps: determining actual impedance values of a to-be-detected battery of which the charge-discharge cycle index is a first cycle index in different frequency ranges and the current first electric quantity of the to-be-detected battery; determining reference impedance values in different frequency ranges based on the first cycle index, the first electric quantity and a preset relation; determining whether the to-be-detected battery is in an abnormal state according to the actual impedance value and the reference impedance value in different frequency ranges; and if the to-be-tested battery is in the abnormal state, executing a battery protection strategy corresponding to the abnormal state. Therefore, whether the to-be-tested battery is in the abnormal state can be accurately determined, and the battery protection strategy corresponding to the abnormal state is adopted to protect the battery when the to-be-tested battery is in the abnormal state, so that the service life of the battery is prolonged, and the use experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage, and particularly to a battery protection method, device, electronic device, medium, and computer program product. Background Art

[0002] As the battery is continuously used, it may exhibit abnormal states such as cyclic decay, lithium plating, and liquid leakage. These abnormal states will affect the user experience. It is of great significance to detect these abnormal states in advance and protect the battery.

[0003] In related technologies, signals such as charging power and battery voltage are identified to determine the charging capacity of the battery, and based on the charging capacity, it is determined whether the battery is overcharged. However, the battery capacity may become smaller as the battery is used, making this method inaccurate and unable to adopt corresponding protection strategies for battery anomalies, resulting in a poor user experience. Summary of the Invention

[0004] The present disclosure provides a battery protection method, device, electronic device, medium, and computer program product. To overcome the problems of being unable to accurately determine whether the battery under test is in an abnormal state and unable to adopt corresponding protection strategies for battery anomalies.

[0005] According to a first aspect of an embodiment of the present disclosure, a battery protection method is provided, including:

[0006] Determine the actual impedance values of the battery under test with the charge-discharge cycle number being the first cycle number in different frequency ranges, and the current first power of the battery under test;

[0007] Based on the first cycle number, the first power, and a preset relationship, determine the reference impedance values in the different frequency ranges; wherein, the preset relationship is used to indicate the corresponding relationship between the power, cycle number, and impedance value of the reference battery;

[0008] According to the actual impedance values and the reference impedance values in the different frequency ranges, determine whether the battery under test is in an abnormal state;

[0009] If the battery under test is in the abnormal state, execute the battery protection strategy corresponding to the abnormal state.

[0010] In some embodiments, the determining whether the battery under test is in an abnormal state according to the actual impedance values and the reference impedance values in the different frequency ranges includes:

[0011] Determine the change parameters of the actual impedance value in each of the frequency ranges respectively according to the magnitude relationship between the actual impedance value and the reference impedance value in the different frequency ranges; wherein, the change parameters include: change amplitude and / or change speed;

[0012] Determine whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges;

[0013] Wherein, the different frequency ranges include: a first frequency range, a second frequency range, a third frequency range and a fourth frequency range; the frequency in the first frequency range is greater than the frequency in the second frequency range, the frequency in the second frequency range is greater than the frequency in the third frequency range, and the frequency in the third frequency range is greater than the frequency in the fourth frequency range.

[0014] In some embodiments, the change parameter includes: a first amplitude by which the actual impedance value increases in the first frequency range;

[0015] The determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0016] When the first amplitude is greater than a preset first threshold, determine that the electrolyte of the battery under test is abnormal in the first frequency range;

[0017] The executing the battery protection strategy corresponding to the abnormal state includes:

[0018] When the electrolyte of the battery under test is abnormal in the first frequency range, reduce the charging current and / or the charging cut-off voltage of the battery under test.

[0019] In some embodiments, the change parameter includes: a second amplitude by which the actual impedance value decreases in the first frequency range;

[0020] The determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0021] When the second amplitude is greater than a preset second threshold, determine that there is a micro short circuit in the battery under test in the first frequency range;

[0022] The executing the battery protection strategy corresponding to the abnormal state includes:

[0023] When the battery under test shows a micro short circuit in the first frequency range, reduce the charging current of the battery under test and output a reminder message;

[0024] Wherein, the reminder message is used to instruct the user to replace the battery under test within a preset time.

[0025] In some embodiments, the change parameter includes: a third amplitude of increase in the actual impedance value in the second frequency range;

[0026] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0027] When the third amplitude is greater than a preset third threshold, it is determined that the battery under test has an interfacial layer abnormality in the second frequency range;

[0028] Executing the battery protection strategy corresponding to the abnormal state includes:

[0029] When the battery under test has an interfacial layer abnormality in the second frequency range, reduce the charging current of the battery under test and / or reduce the power consumption of the electronic device corresponding to the battery under test.

[0030] In some embodiments, the change parameter includes: a fourth amplitude of decrease in the actual impedance value in the second frequency range;

[0031] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0032] When the fourth amplitude is greater than a preset fourth threshold, it is determined that the battery under test has lithium plating in the second frequency range;

[0033] Executing the battery protection strategy corresponding to the abnormal state includes:

[0034] When the battery under test has lithium plating in the second frequency range, reduce the charging current of the battery under test.

[0035] In some embodiments, the change parameter includes: a fifth amplitude of increase in the actual impedance value in the third frequency range;

[0036] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0037] When the fifth amplitude is greater than a preset fifth threshold, it is determined that the positive electrode of the battery under test is abnormal in the third frequency range;

[0038] Performing the battery protection strategy corresponding to the abnormal state includes:

[0039] When the positive electrode of the battery under test is abnormal in the third frequency range, the charging cut-off voltage of the battery under test is reduced.

[0040] In some embodiments, the change parameter includes: a sixth amplitude of the increase in the actual impedance value in the fourth frequency range;

[0041] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0042] When the sixth amplitude is greater than a preset sixth threshold, it is determined that the positive electrode of the battery under test is abnormal in the fourth frequency range;

[0043] Performing the battery protection strategy corresponding to the abnormal state includes:

[0044] When the positive electrode of the battery under test is abnormal in the fourth frequency range, the charging cut-off voltage of the battery under test is reduced.

[0045] According to a second aspect of the embodiments of the present disclosure, there is provided a battery protection device, including:

[0046] A first determination module, configured to determine the actual impedance value of the battery under test with the charge and discharge cycle number being the first cycle number in different frequency ranges, and the current first power of the battery under test;

[0047] A second determination module, configured to determine the reference impedance value in the different frequency ranges based on the first cycle number, the first power, and a preset relationship; wherein, the preset relationship is used to indicate the corresponding relationship between the power, cycle number, and impedance value of the reference battery;

[0048] A third determination module, configured to determine whether the battery under test is in an abnormal state according to the actual impedance value and the reference impedance value in the different frequency ranges;

[0049] An execution module, configured to execute the battery protection strategy corresponding to the abnormal state if the battery under test is in the abnormal state.

[0050] In some embodiments, the third determination module includes:

[0051] A first determination unit, configured to respectively determine change parameters of the actual impedance values in each of the frequency ranges according to a magnitude relationship between the actual impedance values and the reference impedance values in the different frequency ranges; wherein, the change parameters include: a change amplitude and / or a change speed.

[0052] A second determination unit, configured to determine whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges.

[0053] Wherein, the different frequency ranges include: a first frequency range, a second frequency range, a third frequency range, and a fourth frequency range; the frequency in the first frequency range is greater than the frequency in the second frequency range, the frequency in the second frequency range is greater than the frequency in the third frequency range, and the frequency in the third frequency range is greater than the frequency in the fourth frequency range.

[0054] In some embodiments, the change parameter includes: a first amplitude by which the actual impedance value increases in the first frequency range.

[0055] The second determination unit is specifically configured to: when the first amplitude is greater than a preset first threshold, determine that the electrolyte of the battery under test is abnormal in the first frequency range.

[0056] An execution module is specifically configured to: when the electrolyte of the battery under test is abnormal in the first frequency range, reduce the charging current and / or the charging cut-off voltage of the battery under test.

[0057] In some embodiments, the change parameter includes: a second amplitude by which the actual impedance value decreases in the first frequency range.

[0058] The second determination unit is specifically configured to: when the second amplitude is greater than a preset second threshold, determine that there is a micro short circuit in the battery under test in the first frequency range.

[0059] The execution module is specifically configured to: when there is a micro short circuit in the battery under test in the first frequency range, reduce the charging current of the battery under test and output a reminder message.

[0060] Wherein, the reminder message is used to instruct the user to replace the battery under test within a preset time.

[0061] In some embodiments, the change parameter includes: a third amplitude by which the actual impedance value increases in the second frequency range.

[0062] A second determination unit, specifically configured to: when the third amplitude is greater than a preset third threshold, determine that an interfacial layer anomaly occurs in the battery under test in the second frequency range;

[0063] An execution module, specifically configured to: when an interfacial layer anomaly occurs in the battery under test in the second frequency range, reduce the charging current of the battery under test and / or reduce the power consumption of the electronic device corresponding to the battery under test.

[0064] In some embodiments, the change parameter includes: a fourth amplitude of reduction of the actual impedance value in the second frequency range;

[0065] A second determination unit, specifically configured to: when the fourth amplitude is greater than a preset fourth threshold, determine that lithium plating occurs in the battery under test in the second frequency range;

[0066] An execution module, specifically configured to: when lithium plating occurs in the battery under test in the second frequency range, reduce the charging current of the battery under test.

[0067] In some embodiments, the change parameter includes: a fifth amplitude of increase of the actual impedance value in the third frequency range;

[0068] A second determination unit, specifically configured to: when the fifth amplitude is greater than a preset fifth threshold, determine that a positive electrode anomaly occurs in the battery under test in the third frequency range;

[0069] An execution module, specifically configured to: when a positive electrode anomaly occurs in the battery under test in the third frequency range, reduce the charging cut-off voltage of the battery under test.

[0070] In some embodiments, the change parameter includes: a sixth amplitude of increase of the actual impedance value in the fourth frequency range;

[0071] A second determination unit, specifically configured to: when the sixth amplitude is greater than a preset sixth threshold, determine that a positive electrode anomaly occurs in the battery under test in the fourth frequency range;

[0072] An execution module, specifically configured to: when a positive electrode anomaly occurs in the battery under test in the fourth frequency range, reduce the charging cut-off voltage of the battery under test.

[0073] According to a third aspect of the embodiments of the present disclosure, there is provided an electronic device, including:

[0074] A processor;

[0075] A memory for storing processor-executable instructions;

[0076] Wherein, the processor is configured to: when executed, implement the steps of the method described in any one of the above first aspects.

[0077] According to a fourth aspect of the embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, which when the instructions in the storage medium are executed by a processor, can execute the steps of the method described in any one of the above first aspects.

[0078] According to a fifth aspect of the embodiments of the present disclosure, there is provided a computer program product, including a computer program or instructions, which when the computer program or instructions are executed by a processor, implement the steps of the method described in any one of the above first aspects.

[0079] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0080] Since the actual impedance value can reflect the relevant information of the electrolyte, negative electrode, positive electrode, and the substances inside the positive electrode particles of the battery to be tested, based on this, the actual impedance values of the battery to be tested with the charge and discharge cycle number being the first cycle number in different frequency ranges, and the current first battery charge of the battery to be tested are determined. The reference impedance value is used as a comparison for the actual impedance value. According to the correspondence relationship between the first cycle number, the first battery charge, and the battery charge, cycle number, and impedance value of the reference battery, the reference impedance values of the reference battery with the first cycle number and the first battery charge in different frequency ranges are determined. According to the actual impedance values and reference impedance values in different frequency ranges, it is possible to determine whether the battery to be tested is in an abnormal state through the difference between the two, and when the battery to be tested is in an abnormal state, execute the battery protection strategy corresponding to the abnormal state.

[0081] In this way, compared with the related art where only overcharging of the battery can be detected, when the impedance value can reflect the relevant information of the electrolyte, negative electrode, positive electrode, and the substances inside the positive electrode particles of the battery, this embodiment can accurately determine whether the battery to be tested is in an abnormal state based on the actual impedance value and the reference impedance value, and when the battery to be tested is in an abnormal state, take the battery protection strategy corresponding to the abnormal state to protect the battery, which can improve the battery life and the user experience.

[0082] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0084] Figure 1It is a flowchart of a battery protection method shown according to an exemplary embodiment;

[0085] Figure 2 It is a schematic diagram of the actual impedance values of a battery under test in different frequency ranges shown according to an exemplary embodiment;

[0086] Figure 3 It is a flowchart of a battery protection method shown according to an exemplary embodiment;

[0087] Figure 4 It is a block diagram of a battery protection device shown according to an exemplary embodiment;

[0088] Figure 5 It is a hardware structure block of an electronic device shown according to an exemplary embodiment Figure 1 ;

[0089] Figure 6 It is a hardware structure block of an electronic device shown according to an exemplary embodiment Figure 2 . Detailed implementation manners

[0090] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present disclosure. On the contrary, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0091] Figure 1 It is a flowchart of a battery protection method shown according to an exemplary embodiment. As Figure 1 shown, the battery protection method may include the following steps:

[0092] In step 101, determine the actual impedance values of the battery under test with the charge-discharge cycle number being the first cycle number in different frequency ranges, and the current first battery level of the battery under test.

[0093] In step 102, based on the first cycle number, the first battery level, and a preset relationship, determine the reference impedance values in different frequency ranges; wherein, the preset relationship is used to indicate the corresponding relationship among the battery level, the cycle number, and the impedance value of a reference battery.

[0094] In step 103, according to the actual impedance values and the reference impedance values in different frequency ranges, determine whether the battery under test is in an abnormal state.

[0095] If so, execute step 104; if not, execute step 105.

[0096] In step 104, execute the battery protection strategy corresponding to the abnormal state.

[0097] In step 105, end.

[0098] It should be noted that the battery protection method proposed in the present disclosure can be applied to electronic devices. Here, the electronic device may include: a terminal device, for example, a mobile terminal or a fixed terminal. Among them, the mobile terminal may include: devices such as mobile phones, tablet computers, laptop computers, wearable electronic devices, etc. The fixed terminal may include: desktop computers, smart TVs, in-vehicle devices, etc. In some other embodiments, the battery protection method may also be applied to an application installed on the electronic device.

[0099] In some other embodiments, the battery protection method in the embodiments of the present disclosure may be configured in a battery protection device, and the battery protection device may be provided in the electronic device, and the embodiments of the present disclosure do not limit this. It should be noted that the execution subject of the embodiments of the present disclosure may be a central processing unit (CPU) in the electronic device in terms of hardware, and may be a relevant background service in the electronic device in terms of software, and this is not limited.

[0100] It can be understood that as an energy storage device, the cycle life of the battery affects the use experience and use cost. As the battery is used, it may exhibit abnormal states such as cycle attenuation, lithium plating in the battery, and liquid leakage. These abnormal states will seriously affect the user's use experience. Detecting these abnormal states in advance and taking corresponding protection measures helps to better use the battery, fully utilize the maximum performance of the battery, and avoid possible failure risks.

[0101] Here, cycle attenuation may be a phenomenon in which the battery capacity gradually decreases as the number of battery charging cycles increases. Lithium plating may be an abnormal phenomenon in which during the charging process of a lithium-ion battery, lithium ions do not embed in the negative electrode material on the negative electrode side but precipitate on the negative electrode surface in the form of metallic lithium. Liquid leakage may be a phenomenon in which the liquid inside the battery leaks to the outside of the battery case.

[0102] It can be understood that the number of charge-discharge cycles may be the number of times the battery is charged from full charge to complete discharge and then charged again. The first number of cycles may be the number of cycles currently reached by the battery to be tested, for example, 200 times, and this embodiment does not specifically limit this value. The first battery level may be the current battery level of the battery to be tested, for example, 90% battery level. Different frequency ranges may be preset frequency ranges. For example, the frequency range from 0.1 to 10 megahertz (MHz) may be divided into four different frequency ranges, and the division of the frequency range is not limited here.

[0103] Here, the first cycle number, the first battery charge, and the frequency of the battery under test will affect the actual impedance value of the battery under test, and the actual impedance value can reflect relevant information about the electrolyte, the negative electrode, the positive electrode, and the substances inside the positive electrode particles of the battery under test. This information is closely related to whether the battery under test is abnormal.

[0104] In this embodiment, the actual impedance values of the battery under test at the first cycle number and the first battery charge in different frequency ranges can be determined according to the electrochemical impedance spectrum of the battery under test; the actual impedance values of the battery under test in different frequency ranges can also be determined by other impedance determination methods, which are not limited here.

[0105] Here, the electrochemical impedance spectrum is a technique for inputting alternating voltage signals with different frequencies to the battery under test, measuring the feedback response alternating current signals, and determining the impedance of the battery under test at different frequencies according to the variation of the ratio of the alternating voltage signal to the alternating current signal with frequency.

[0106] Among them, the alternating voltage can be a sinusoidal alternating voltage, or the superposition of sinusoidal alternating voltages converted after mathematical processing of other non-sinusoidal alternating voltages.

[0107] In this embodiment, in order to compare with the actual impedance values of the battery under test in different frequency ranges, the reference impedance value of the reference battery also needs to be determined. Based on this, according to the corresponding relationship between the battery charge, the cycle number, and the impedance value of the reference battery, the impedance values of the reference battery at the first cycle number and the first battery charge in different frequency ranges are determined, and this impedance value is the reference impedance value.

[0108] Among them, the reference battery is a battery that has not shown an abnormal state. The reference impedance value can also be determined according to the electrochemical impedance spectrum of the reference battery at the first cycle number and the first battery charge, or can be determined by other impedance determination methods, which are not limited here.

[0109] It should be noted that: the frequency ranges corresponding to the actual impedance value and the reference impedance value are the same, so that the comparison between the two is meaningful. For example, the two can be impedance values determined respectively in four different frequency ranges divided based on 0.1 to 10 MHz.

[0110] Here, whether the battery under test is in an abnormal state can be understood as whether the battery under test has an abnormality.

[0111] Understandably, since the reference battery is a battery without an abnormal state, the reference impedance value can be used as a comparison for the actual reference value. By comparing the differences between the actual impedance values and the reference impedance values in different frequency ranges, it is possible to determine whether the battery under test is in an abnormal state. In this way, after determining that the battery under test is in an abnormal state and implementing a battery protection strategy corresponding to the abnormal state for the battery under test, the battery under test can be protected.

[0112] It should be noted that the battery under test can be a power battery or an energy storage battery, and this embodiment does not limit this. The battery under test and the reference battery can be of the same type of battery or of the same batch of production of the same type of battery, and this is not limited here.

[0113] In the embodiments of the present disclosure, since the actual impedance value can reflect information related to the electrolyte, negative electrode, positive electrode, and substances inside the positive electrode particles of the battery under test, based on this, the actual impedance values of the battery under test with the first number of charge and discharge cycles in different frequency ranges are determined, as well as the current first battery charge of the battery under test. The reference impedance value is used as a comparison for the actual impedance value. According to the correspondence relationship between the first number of cycles, the first battery charge, and the battery charge, number of cycles, and impedance value of the reference battery, the reference impedance values of the reference battery with the first number of cycles and the first battery charge in different frequency ranges are determined. According to the actual impedance values and the reference impedance values in different frequency ranges, it is possible to determine whether the battery under test is in an abnormal state through the differences between the two, and in the case where the battery under test is in an abnormal state, implement a battery protection strategy corresponding to the abnormal state.

[0114] In this way, compared with the related art where only overcharge of the battery can be detected, in the case where the impedance value can reflect information related to the electrolyte, negative electrode, positive electrode, and substances inside the positive electrode particles of the battery, this embodiment can accurately determine whether the battery under test is in an abnormal state based on the actual impedance value and the reference impedance value. Moreover, in the case where the battery under test is in an abnormal state, a battery protection strategy corresponding to the abnormal state is adopted to protect the battery, which can improve the battery life and the user experience.

[0115] In some embodiments, determining whether the battery under test is in an abnormal state according to the actual impedance value and the reference impedance value in different frequency ranges includes:

[0116] According to the magnitude relationship between the actual impedance values and the reference impedance values in different frequency ranges, variation parameters of the actual impedance values in each of the frequency ranges are determined respectively; wherein, the variation parameters include: variation amplitude and / or variation speed;

[0117] Determine whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude and / or the change speed in each of the frequency ranges;

[0118] Among them, the different frequency ranges include: a first frequency range, a second frequency range, a third frequency range, and a fourth frequency range; the frequency in the first frequency range is greater than the frequency in the second frequency range, the frequency in the second frequency range is greater than the frequency in the third frequency range, and the frequency in the third frequency range is greater than the frequency in the fourth frequency range.

[0119] It can be understood that the change amplitude can be used to measure the difference between the actual impedance value and the reference impedance value. It can be the ratio of the increase or decrease of the actual impedance value compared with the reference impedance value, usually expressed as a percentage. If the percentage is positive, it is called the growth rate; if the percentage is negative, it is called the reduction rate.

[0120] Among them, the change amplitude can be determined by the following method:

[0121] Change amplitude = (actual impedance value - reference impedance value) / reference impedance value × 100%

[0122] It can be understood that the change speed can also be used to measure the difference between the actual impedance value and the reference impedance value. It can be the change situation of the actual impedance value relative to the reference impedance value, which can include the increasing speed or the decreasing speed, and usually can be expressed by the difference between the actual impedance value and the reference impedance value.

[0123] Exemplarily, the frequency interval corresponding to the first frequency range can be: 0.1 to 1 Hertz (Hz), the frequency interval corresponding to the second frequency range can be: 1 to 500 Hz, the frequency interval corresponding to the third frequency range can be: 500 Hz to 10 kilohertz (kHz), and the frequency interval corresponding to the fourth frequency range can be: 10 kHz to 10 MHz.

[0124] It should be noted that the above frequency intervals are for illustrative purposes only and are not used to limit it.

[0125] In this embodiment, after determining the actual impedance value of the battery under test in different frequency ranges and the reference impedance value of the reference battery in different frequency ranges, when the different frequency ranges include: the first frequency range, the second frequency range, the third frequency range, and the fourth frequency range, according to the magnitude relationship between the actual impedance value in the first frequency range and the reference impedance value in the first frequency range, the change parameter of the actual impedance value in the first frequency range can be determined; according to the magnitude relationship between the actual impedance value in the second frequency range and the reference impedance value in the second frequency range, the change parameter of the actual impedance value in the second frequency range can be determined; according to the magnitude relationship between the actual impedance value in the third frequency range and the reference impedance value in the third frequency range, the change parameter of the actual impedance value in the third frequency range can be determined; and according to the magnitude relationship between the actual impedance value in the fourth frequency range and the reference impedance value in the fourth frequency range, the change parameter of the actual impedance value in the fourth frequency range can be determined.

[0126] It can be understood that the actual impedance values in different frequency ranges (each frequency range) can reflect the impedance information of different parts of the battery. Then, according to the change parameters of the actual impedance values in different frequency ranges (such as: change amplitude and / or change speed), the change information of different parts of the battery can be determined, so as to determine which part of the battery is abnormal, that is: by the change amplitude of the actual impedance value in each frequency range and / or the change speed of the actual impedance value in each frequency range, it is determined whether the battery under test is in an abnormal state in each frequency range.

[0127] In this embodiment, through the change parameters of the actual impedance values in each frequency range, that is: the change amplitude in each frequency range and / or the change speed in each frequency range, it is possible to more accurately determine whether the battery under test is in an abnormal state, so as to take a battery protection strategy corresponding to the abnormal state to protect the battery under test when the battery under test is in an abnormal state.

[0128] Figure 2 It is a schematic diagram of the actual impedance value of a battery under test in different frequency ranges shown according to an exemplary embodiment. As Figure 2 shown: in the order of decreasing frequency within different frequency ranges, the actual impedance value in the first frequency range, the actual impedance value in the second frequency range, the actual impedance value in the third frequency range, and the actual impedance value in the fourth frequency range are obtained in sequence through electrochemical impedance spectroscopy.

[0129] Among them, the actual impedance value in the first frequency range can be the ohmic impedance R b of the battery under test, which can reflect the information of the electrolyte between the positive and negative electrodes of the battery under test; the actual impedance value in the second frequency range can be the interfacial layer impedance R SEI, which can reflect the information of the negative electrode surface (i.e., the interface layer) of the battery to be tested; the actual impedance value in the third frequency range can be the charge transfer impedance R of the battery to be tested ct , which can reflect the information of the positive electrode surface of the battery to be tested; the actual impedance value in the third frequency range can be the diffusion impedance W of the battery to be tested, which can reflect the information of the diffusion of substances (such as lithium ions) inside the positive electrode particles of the battery to be tested.

[0130] It should be noted that: Figure 2 The real part in is usually impedance, and the imaginary part is usually capacitive reactance and inductive reactance. Figure 2 The 4 actual impedance values in are for illustrative purposes only and are not used for limitation.

[0131] In some embodiments, the change parameter includes: the first amplitude of the increase in the actual impedance value in the first frequency range;

[0132] Determining whether the battery to be tested is in an abnormal state in each of the frequency ranges according to the change amplitude and / or the change speed in each of the frequency ranges includes:

[0133] When the first amplitude is greater than a preset first threshold, it is determined that the electrolyte of the battery to be tested is abnormal in the first frequency range;

[0134] Performing the battery protection strategy corresponding to the abnormal state includes:

[0135] When the electrolyte of the battery to be tested is abnormal in the first frequency range, reduce the charging current and / or the charging cut-off voltage of the battery to be tested.

[0136] It can be understood that the change amplitude of the actual impedance value in the first frequency range can be determined by the change amplitude determination formula. When the change amplitude is positive, it is called the first amplitude of the increase in the actual impedance value in the first frequency range. At this time, the actual impedance value in the first frequency range is greater than the reference impedance value in the first frequency range.

[0137] Since the first frequency range includes multiple frequencies, and each frequency corresponds to an actual impedance value and a reference impedance value, when the actual impedance value in the first frequency range is greater than the reference impedance value in the first frequency range, the first amplitude of the increase in the actual impedance value in the first frequency range can be determined according to the actual impedance value corresponding to a certain frequency in the first frequency range and the reference impedance value corresponding to that frequency; it is also possible to calculate the average actual impedance value of the actual impedance values corresponding to multiple frequencies in the first frequency range, calculate the average reference impedance value of the reference impedance values corresponding to the same multiple frequencies in the first frequency range, and determine the first amplitude of the increase in the actual impedance value in the first frequency range based on these two average values; it is also possible to determine the first amplitude by other means, which is not limited here.

[0138] Here, the preset first threshold can be a pre-determined percentage, such as 20% or 50%, etc., which is not limited here.

[0139] After determining the first amplitude of the increase in the actual impedance value in the first frequency range, compare the first amplitude with the preset first threshold. When the first amplitude is greater than the preset first threshold, it is determined that the battery under test is in an abnormal state (i.e., an abnormality has occurred), and the type of the abnormal state of the battery under test in the first frequency range is: electrolyte abnormality, that is, the battery under test has an electrolyte abnormality in the first frequency range. The electrolyte abnormality can include situations such as an accelerated electrolyte consumption rate or leakage. At this time, when the battery under test has an electrolyte abnormality in the first frequency range, reduce the charging current and / or the charging cut-off voltage of the battery under test to protect the battery under test.

[0140] It can be understood that when the first amplitude is less than or equal to the preset first threshold, it is determined that the battery under test does not have an electrolyte abnormality in the first frequency range.

[0141] Exemplarily, if the preset first threshold is a first value (such as 50%), when the first amplitude is greater than the first value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging current of the battery under test (such as the first-stage constant current charging current of the step charging) to a value less than or equal to the first current; or, reducing the charging cut-off voltage of the battery under test by the first voltage value; or, reducing the charging current of the battery under test to a value less than or equal to the first current, and at the same time reducing the charging cut-off voltage of the battery under test by the first voltage value.

[0142] Among them, the first current can be a value corresponding to the first percentage of the original charging current (the first percentage is less than 100%, such as 70%). The first voltage value can be 30 millivolts (mV), or a value greater than 30 mV.

[0143] Exemplarily, if the preset first threshold is a second value (such as 20%), when the first amplitude is greater than the second value and less than or equal to the first value, the battery protection strategy corresponding to the abnormal state may be: reducing the charging current of the battery under test to a value less than or equal to the second current; or, reducing the charging cut-off voltage of the battery under test by the second voltage value; or, reducing the charging current of the battery under test to a value less than or equal to the second current, and at the same time reducing the charging cut-off voltage of the battery under test by the second voltage value.

[0144] Wherein, the first value is greater than the second value. The second current may be the value corresponding to the second percentage of the original charging current (the second percentage is less than 100% and greater than the first percentage, such as 80%), and the second current is greater than the first current. The first voltage value may be 20 mV, or a value greater than 20 mV, and the second voltage value is less than the first voltage value.

[0145] In this embodiment, when it is determined that the electrolyte of the battery under test is abnormal in the first frequency range, the charging current and / or the charging cut-off voltage of the battery under test are reduced, and the battery under test is protected in a targeted manner through this protection strategy, which is beneficial to achieving the maximum protection of the battery and improving the user experience.

[0146] In some embodiments, the change parameter includes: the second amplitude of the reduction of the actual impedance value in the first frequency range;

[0147] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0148] When the second amplitude is greater than a preset second threshold, it is determined that a micro short circuit occurs in the battery under test in the first frequency range;

[0149] Executing the battery protection strategy corresponding to the abnormal state includes:

[0150] When a micro short circuit occurs in the battery under test in the first frequency range, reducing the charging current of the battery under test and outputting a reminder message;

[0151] Wherein, the reminder message is used to instruct the user to replace the battery under test within a preset time.

[0152] It can be understood that the change amplitude of the actual impedance value in the first frequency range can be determined through the change amplitude determination formula. When the change amplitude is negative, it is called the second amplitude of the reduction of the actual impedance value in the first frequency range. At this time, the actual impedance value in the first frequency range is less than the reference impedance value in the first frequency range.

[0153] Since the first frequency range includes multiple frequencies, and each frequency corresponds to an actual impedance value and a reference impedance value, when the actual impedance value in the first frequency range is less than the reference impedance value in the first frequency range, the second amplitude of the reduction of the actual impedance value in the first frequency range can be determined according to the actual impedance value corresponding to a certain frequency in the first frequency range and the reference impedance value corresponding to that frequency; it is also possible to calculate the average actual impedance value of the actual impedance values corresponding to multiple frequencies in the first frequency range, calculate the average reference impedance value of the reference impedance values corresponding to the same multiple frequencies in the first frequency range, and determine the second amplitude of the reduction of the actual impedance value in the first frequency range based on these two average values; it is also possible to determine the second amplitude by other means, which is not limited here.

[0154] Here, the preset second threshold can be a pre-determined percentage, such as 20% or 50%, etc., which is not limited here. Micro-short circuit can be an abnormal short circuit phenomenon generated between two electrodes inside the battery. The preset time can be a pre-determined time, such as 1 day or 12 hours, etc., which is not limited here.

[0155] After determining the second amplitude of the reduction of the actual impedance value in the first frequency range, compare the second amplitude with the preset second threshold. When the second amplitude is greater than the preset second threshold, it is determined that the battery under test is in an abnormal state, and the type of the abnormal state of the battery under test in the first frequency range is: micro-short circuit, that is, the battery under test has a micro-short circuit in the first frequency range. Micro-short circuit can include situations such as damaged isolation layer or lithium plating. At this time, when the battery under test has a micro-short circuit in the first frequency range, reduce the charging current of the battery under test and output a reminder message, and the reminder message is used to instruct the user to replace the battery under test within the preset time to improve the user experience.

[0156] It can be understood that when the second amplitude is less than or equal to the preset second threshold, it is determined that the battery under test does not have a micro-short circuit in the first frequency range.

[0157] Exemplarily, if the preset second threshold is a third value (such as 50%), when the second amplitude is greater than the third value, the battery protection strategy corresponding to the abnormal state can be: reduce the charging current of the battery under test to a value less than or equal to the third current and output a reminder message.

[0158] Wherein, the third current can be the value corresponding to the third percentage (the third percentage is less than 100%, such as 60%) of the original charging current.

[0159] Exemplarily, if the preset second threshold is the fourth value (such as 20%), when the second amplitude is greater than the fourth value and less than or equal to the third value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging current of the battery under test to a value less than or equal to the fourth current, and outputting a reminder message.

[0160] Wherein, the third value is greater than the fourth value. The fourth current can be the value corresponding to the fourth percentage (the fourth percentage is less than 100% and greater than the third percentage, such as 70%) of the original charging current, and the fourth current is greater than the third current.

[0161] It should be noted that: the first value and the third value can be the same or different, and no limitation is made here; the second value and the fourth value can be the same or different, and no limitation is made here.

[0162] In this embodiment, when it is determined that the battery under test has a micro short circuit in the first frequency range, the charging current of the battery under test is reduced, and a reminder message is output. Through this protection strategy, the battery under test can be protected in a targeted manner, which is beneficial to replacing the battery under test as soon as possible to improve the user experience.

[0163] In some embodiments, the change parameter includes: the third amplitude of the increase in the actual impedance value in the second frequency range;

[0164] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0165] When the third amplitude is greater than the preset third threshold, it is determined that the battery under test has an interfacial layer abnormality in the second frequency range;

[0166] Executing the battery protection strategy corresponding to the abnormal state includes:

[0167] When the battery under test has an interfacial layer abnormality in the second frequency range, reducing the charging current of the battery under test and / or reducing the power consumption of the electronic device corresponding to the battery under test.

[0168] It can be understood that the change amplitude in the second frequency range of the actual impedance value can be determined through the change amplitude determination formula. When the change amplitude is a positive number, it is called the third amplitude of the increase in the actual impedance value in the second frequency range. At this time, the actual impedance value in the second frequency range is greater than the reference impedance value in the second frequency range.

[0169] Since the second frequency range includes multiple frequencies, and each frequency corresponds to an actual impedance value and a reference impedance value, when the actual impedance value in the second frequency range is greater than the reference impedance value in the second frequency range, the third amplitude of the increase in the actual impedance value in the second frequency range can be determined based on the actual impedance value corresponding to a certain frequency in the second frequency range and the reference impedance value corresponding to that frequency; it is also possible to calculate the average actual impedance value for the actual impedance values corresponding to multiple frequencies in the second frequency range, calculate the average reference impedance value for the reference impedance values corresponding to the same multiple frequencies in the second frequency range, and determine the third amplitude of the increase in the actual impedance value in the second frequency range based on these two average values; it is also possible to determine the third amplitude by other means, which is not limited here.

[0170] Here, the preset third threshold can be a predetermined percentage, such as 20% or 50%, etc., which is not limited here. The interface layer abnormality can include situations such as a relatively rapid increase in the interface layer thickness or an accelerated battery cycle decay. The interface layer can be a solid electrolyte interface on the negative electrode.

[0171] After determining the third amplitude of the increase in the actual impedance value in the second frequency range, compare the size of the third amplitude with the preset third threshold. When the third amplitude is greater than the preset third threshold, it is determined that the battery under test is in an abnormal state, and the type of the abnormal state of the battery under test in the second frequency range is: interface layer abnormality, that is, the battery under test has an interface layer abnormality in the second frequency range. At this time, when the battery under test has an interface layer abnormality in the second frequency range, reduce the charging current of the battery under test and / or reduce the power consumption of the electronic device corresponding to the battery under test.

[0172] Among them, reducing the power consumption of the electronic device corresponding to the battery under test can be: closing the programs running in the background of the electronic device, or reducing the brightness of the electronic device, etc., which is not limited here.

[0173] It can be understood that when the third amplitude is less than or equal to the preset third threshold, it is determined that the battery under test does not have an interface layer abnormality in the second frequency range.

[0174] Exemplarily, if the preset third threshold is the fifth value (such as 50%), when the third amplitude is greater than the fifth value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging current of the battery under test to a value less than or equal to the fifth current; or, reducing the power consumption of the electronic device corresponding to the battery under test to a value less than or equal to the first power consumption; or, reducing the charging current of the battery under test to a value less than or equal to the fifth current, and at the same time, reducing the power consumption of the electronic device corresponding to the battery under test to a value less than or equal to the first power consumption.

[0175] Among them, the fifth current may be a value corresponding to a fifth percentage (the fifth percentage is less than 100%, such as 70%) of the original charging current. The value of the first power consumption may be a value corresponding to a sixth percentage (the sixth percentage is less than 100%, such as 80%) of the original power consumption.

[0176] Exemplarily, if the preset third threshold is a sixth value (such as 20%), when the third amplitude is greater than the sixth value and less than or equal to the fifth value, the battery protection strategy corresponding to the abnormal state may be: reducing the charging current of the battery under test to a value less than or equal to the sixth current; or, reducing the power consumption of the electronic device corresponding to the battery under test to a value less than or equal to the second power consumption; or, reducing the charging current of the battery under test to a value less than or equal to the sixth current, and at the same time, reducing the power consumption of the electronic device corresponding to the battery under test to a value less than or equal to the second power consumption.

[0177] Among them, the fifth value is greater than the sixth value. The sixth current may be a value corresponding to a seventh percentage (the seventh percentage is less than 100%, greater than the fifth percentage, such as 80%) of the original charging current, and the sixth current is greater than the fifth current. The value of the second power consumption may be a value corresponding to an eighth percentage (the eighth percentage is less than 100%, such as 90%) of the original power consumption, and the value of the second power consumption is greater than the value of the first power consumption.

[0178] It should be noted that: the fifth value and the third value may be the same or different, and are not limited here; the sixth value and the fourth value may be the same or different, and are not limited here.

[0179] In this embodiment, when it is determined that the battery under test has an interface layer abnormality in the second frequency range, reducing the charging current of the battery under test and / or reducing the power consumption of the electronic device corresponding to the battery under test, through this protection strategy, the battery under test can be protected in a targeted manner, which is beneficial to achieving the maximum protection of the battery and improving the user experience.

[0180] In some embodiments, the change parameter includes: the fourth amplitude of the reduction of the actual impedance value in the second frequency range;

[0181] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0182] When the fourth amplitude is greater than a preset fourth threshold, it is determined that lithium plating occurs in the battery under test in the second frequency range;

[0183] Executing the battery protection strategy corresponding to the abnormal state includes:

[0184] When lithium plating occurs in the battery under test in the second frequency range, the charging current of the battery under test is reduced.

[0185] Understandably, the change amplitude of the actual impedance value in the second frequency range can be determined through the change amplitude determination formula. When the change amplitude is negative, it is called the fourth amplitude of the reduction of the actual impedance value in the second frequency range. At this time, the actual impedance value in the second frequency range is less than the reference impedance value in the second frequency range.

[0186] Since the second frequency range includes multiple frequencies, and each frequency corresponds to an actual impedance value and a reference impedance value, then when the actual impedance value in the second frequency range is less than the reference impedance value in the second frequency range, the fourth amplitude of the reduction of the actual impedance value in the second frequency range can be determined according to the actual impedance value corresponding to a certain frequency in the second frequency range and the reference impedance value corresponding to this frequency; it is also possible to calculate the average actual impedance value of the actual impedance values corresponding to multiple frequencies in the second frequency range, calculate the average reference impedance value of the reference impedance values corresponding to the same multiple frequencies in the second frequency range, and determine the fourth amplitude of the reduction of the actual impedance value in the second frequency range according to these two average values; it is also possible to determine the fourth amplitude by other means, which is not limited here.

[0187] Here, the preset fourth threshold can be a pre-determined percentage, such as 20% or 50%, etc., which is not limited here.

[0188] After determining the fourth amplitude of the reduction of the actual impedance value in the second frequency range, compare the fourth amplitude with the preset fourth threshold. When the fourth amplitude is greater than the preset fourth threshold, it is determined that the battery under test is in an abnormal state, and the type of the abnormal state of the battery under test in the second frequency range is: lithium plating, that is, lithium plating occurs in the battery under test in the second frequency range. At this time, when lithium plating occurs in the battery under test in the second frequency range, the charging current of the battery under test is reduced.

[0189] Understandably, when the fourth amplitude is less than or equal to the preset fourth threshold, it is determined that lithium plating does not occur in the battery under test in the second frequency range.

[0190] Exemplarily, if the preset fourth threshold is the seventh value (such as 50%), when the fourth amplitude is greater than the seventh value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging current of the battery under test to a value less than or equal to the seventh current.

[0191] Among them, the seventh current can be the value corresponding to the ninth percentage of the original charging current (the ninth percentage is less than 100%, such as 60%).

[0192] Exemplarily, if the preset fourth threshold is the eighth value (e.g., 20%), when the fourth amplitude is greater than the eighth value and less than or equal to the seventh value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging current of the battery under test to a value less than or equal to the eighth current.

[0193] Among them, the seventh value is greater than the eighth value. The eighth current can be the value corresponding to the tenth percentage (the tenth percentage is less than 100%, e.g., 70%) of the original charging current, and the eighth current is greater than the seventh current.

[0194] It should be noted that: the seventh value and the fifth value can be the same or different, and are not limited here; the eighth value and the sixth value can be the same or different, and are not limited here.

[0195] In this embodiment, when it is determined that lithium plating occurs in the battery under test in the second frequency range, the charging current of the battery under test is reduced. Through this protection strategy, the battery under test can be protected in a targeted manner, which is beneficial to achieving the maximum protection of the battery and improving the user experience.

[0196] In some embodiments, the change parameter includes: the fifth amplitude of the increase in the actual impedance value in the third frequency range;

[0197] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude and / or the change speed in each of the frequency ranges includes:

[0198] When the fifth amplitude is greater than a preset fifth threshold, it is determined that the battery under test has a positive electrode abnormality in the third frequency range;

[0199] Executing the battery protection strategy corresponding to the abnormal state includes:

[0200] When the battery under test has a positive electrode abnormality in the third frequency range, reducing the charging cut-off voltage of the battery under test.

[0201] It can be understood that the change amplitude of the actual impedance value in the third frequency range can be determined through the change amplitude determination formula. When the change amplitude is a positive number, it is called the fifth amplitude of the increase in the actual impedance value in the third frequency range. At this time, the actual impedance value in the third frequency range is greater than the reference impedance value in the third frequency range.

[0202] Since the third frequency range includes multiple frequencies, and each frequency corresponds to an actual impedance value and a reference impedance value, when the actual impedance value in the third frequency range is greater than the reference impedance value in the third frequency range, the fifth amplitude of the increase in the actual impedance value in the third frequency range can be determined based on the actual impedance value corresponding to a certain frequency in the third frequency range and the reference impedance value corresponding to that frequency; it is also possible to calculate the average actual impedance value for the actual impedance values corresponding to multiple frequencies in the third frequency range, calculate the average reference impedance value for the reference impedance values corresponding to the same multiple frequencies in the third frequency range, and determine the fifth amplitude of the increase in the actual impedance value in the third frequency range based on these two average values; it is also possible to determine the fifth amplitude by other means, which is not limited here.

[0203] Here, the preset fifth threshold can be a predetermined percentage, such as 20% or 50%, etc., which is not limited here.

[0204] After determining the fifth amplitude of the increase in the actual impedance value in the third frequency range, compare the fifth amplitude with the preset fifth threshold. When the fifth amplitude is greater than the preset fifth threshold, it is determined that the battery under test is in an abnormal state, and the type of the abnormal state of the battery under test in the third frequency range is: positive electrode abnormality, that is, the battery under test has a positive electrode abnormality in the third frequency range. At this time, when the battery under test has a positive electrode abnormality in the third frequency range, the charging cut-off voltage of the battery under test is reduced.

[0205] Here, the positive electrode abnormality can include situations such as positive electrode failure or accelerated battery cycle decay.

[0206] It can be understood that when the fifth amplitude is less than or equal to the preset fifth threshold, it is determined that the battery under test does not have a positive electrode abnormality in the third frequency range.

[0207] Exemplarily, if the preset fifth threshold is the ninth value (such as 50%), when the fifth amplitude is greater than the ninth value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging cut-off voltage of the battery under test by the third voltage value.

[0208] Among them, the third voltage value can be 30 mV, or a value greater than 30 mV.

[0209] Exemplarily, if the preset fifth threshold is the tenth value (such as 20%), when the fifth amplitude is greater than the tenth value and less than or equal to the ninth value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging cut-off voltage of the battery under test by the fourth voltage value.

[0210] Among them, the fourth voltage value can be 20 mV, or a value greater than 20 mV, and the fourth voltage value is less than the third voltage value.

[0211] It should be noted that: the ninth value and the seventh value may be the same or different, and no limitation is made here; the tenth value and the eighth value may be the same or different, and no limitation is made here.

[0212] In this embodiment, when it is determined that the battery under test has a positive electrode abnormality in the third frequency range, the charging cut-off voltage of the battery under test is reduced. Through this protection strategy, targeted protection of the battery under test can be achieved, which is beneficial to achieving the maximum protection of the battery and improving the user experience.

[0213] In some embodiments, the change parameter includes: the sixth amplitude of the increase in the actual impedance value in the fourth frequency range;

[0214] Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes:

[0215] When the sixth amplitude is greater than a preset sixth threshold, it is determined that the battery under test has a positive electrode abnormality in the fourth frequency range;

[0216] Executing the battery protection strategy corresponding to the abnormal state includes:

[0217] When the battery under test has a positive electrode abnormality in the fourth frequency range, the charging cut-off voltage of the battery under test is reduced.

[0218] It can be understood that the change amplitude of the actual impedance value in the fourth frequency range can be determined through the change amplitude determination formula. When the change amplitude is positive, it is called the sixth amplitude of the increase in the actual impedance value in the fourth frequency range. At this time, the actual impedance value in the fourth frequency range is greater than the reference impedance value in the fourth frequency range.

[0219] Since the fourth frequency range includes multiple frequencies, and each frequency corresponds to an actual impedance value and a reference impedance value, then when the actual impedance value in the fourth frequency range is greater than the reference impedance value in the fourth frequency range, the sixth amplitude of the increase in the actual impedance value in the fourth frequency range can be determined according to the actual impedance value corresponding to a certain frequency in the fourth frequency range and the reference impedance value corresponding to this frequency; the actual impedance average value can also be obtained for the actual impedance values corresponding to multiple frequencies in the fourth frequency range, and the reference impedance average value can be obtained for the reference impedance values corresponding to the same multiple frequencies in the fourth frequency range, and the sixth amplitude of the increase in the actual impedance value in the fourth frequency range can be determined according to these two average values; the sixth amplitude can also be determined by other means, and no limitation is made here.

[0220] Here, the preset sixth threshold can be a predetermined percentage, such as 20% or 50%, etc., and there is no limitation here.

[0221] After determining the sixth amplitude of the increase in the actual impedance value in the fourth frequency range, compare the sixth amplitude with the preset sixth threshold. When the sixth amplitude is greater than the preset sixth threshold, it is determined that the battery under test is in an abnormal state, and the type of the abnormal state of the battery under test in the fourth frequency range is: positive electrode abnormality, that is, the battery under test has a positive electrode abnormality in the fourth frequency range. At this time, when the battery under test has a positive electrode abnormality in the fourth frequency range, the charging cut-off voltage of the battery under test is reduced.

[0222] It can be understood that when the sixth amplitude is less than or equal to the preset sixth threshold, it is determined that the battery under test does not have a positive electrode abnormality in the fourth frequency range.

[0223] Exemplarily, if the preset sixth threshold is the eleventh value (such as 50%), when the sixth amplitude is greater than the eleventh value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging cut-off voltage of the battery under test by the fifth voltage value.

[0224] Among them, the fifth voltage value can be 30 mV, or a value greater than 30 mV.

[0225] Exemplarily, if the preset fifth threshold is the twelfth value (such as 20%), when the fifth amplitude is greater than the twelfth value and less than or equal to the eleventh value, the battery protection strategy corresponding to the abnormal state can be: reducing the charging cut-off voltage of the battery under test by the sixth voltage value.

[0226] Among them, the sixth voltage value can be 20 mV, or a value greater than 20 mV, and the sixth voltage value is less than the fifth voltage value.

[0227] It should be noted that: the eleventh value and the ninth value can be the same or different, and there is no limitation here; the twelfth value and the tenth value can be the same or different, and there is no limitation here.

[0228] In this embodiment, when it is determined that the battery under test has a positive electrode abnormality in the fourth frequency range, the charging cut-off voltage of the battery under test is reduced. Through this protection strategy, the battery under test can be protected in a targeted manner, which is beneficial to achieving the maximum protection of the battery and improving the user experience.

[0229] Figure 3 is a flowchart of a battery protection method shown according to an exemplary embodiment. As Figure 3 shown, the method may include the following steps:

[0230] In step 301, determine the actual impedance values of the battery under test with the charge-discharge cycle number being the first cycle number in different frequency ranges, and the current first battery level of the battery under test.

[0231] In step 302, based on the first cycle number, the first battery level, and a preset relationship, determine the reference impedance values in different frequency ranges; wherein the preset relationship is used to indicate the corresponding relationship among the battery level, cycle number, and impedance value of a reference battery.

[0232] In step 303, according to the magnitude relationship between the actual impedance values and the reference impedance values in different frequency ranges, respectively determine the change parameters of the actual impedance values in each frequency range; wherein the change parameters include: change amplitude and / or change speed.

[0233] In step 304, according to the change amplitude in each frequency range and / or the change speed in each frequency range, determine whether the battery under test is in an abnormal state in each frequency range.

[0234] If so, execute step 305; if not, execute step 306.

[0235] In step 305, execute the battery protection strategy corresponding to the abnormal state.

[0236] In step 306, end.

[0237] Figure 4 It is a block diagram of a battery protection device shown according to an exemplary embodiment. Refer to Figure 4 , the battery protection device 400 includes:

[0238] A first determination module 401, configured to determine the actual impedance values of the battery under test with the charge-discharge cycle number being the first cycle number in different frequency ranges, and the current first battery level of the battery under test;

[0239] A second determination module 402, configured to determine the reference impedance values in the different frequency ranges based on the first cycle number, the first battery level, and a preset relationship; wherein the preset relationship is used to indicate the corresponding relationship among the battery level, cycle number, and impedance value of a reference battery;

[0240] A third determination module 403, configured to determine whether the battery under test is in an abnormal state according to the actual impedance values and the reference impedance values in the different frequency ranges;

[0241] An execution module 404, configured to execute the battery protection strategy corresponding to the abnormal state if the battery under test is in the abnormal state.

[0242] In some embodiments, the third determination module 403 includes:

[0243] A first determination unit, configured to respectively determine change parameters of the actual impedance values in each of the frequency ranges according to the magnitude relationship between the actual impedance values and the reference impedance values in the different frequency ranges; wherein, the change parameters include: change amplitude and / or change speed;

[0244] A second determination unit, configured to determine whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges;

[0245] Wherein, the different frequency ranges include: a first frequency range, a second frequency range, a third frequency range, and a fourth frequency range; the frequency in the first frequency range is greater than the frequency in the second frequency range, the frequency in the second frequency range is greater than the frequency in the third frequency range, and the frequency in the third frequency range is greater than the frequency in the fourth frequency range.

[0246] In some embodiments, the change parameter includes: a first amplitude of increase in the actual impedance value in the first frequency range;

[0247] The second determination unit is specifically configured to: when the first amplitude is greater than a preset first threshold, determine that the electrolyte of the battery under test is abnormal in the first frequency range;

[0248] The execution module 404 is specifically configured to: when the electrolyte of the battery under test is abnormal in the first frequency range, reduce the charging current and / or the charging cut-off voltage of the battery under test.

[0249] In some embodiments, the change parameter includes: a second amplitude of decrease in the actual impedance value in the first frequency range;

[0250] The second determination unit is specifically configured to: when the second amplitude is greater than a preset second threshold, determine that there is a micro short circuit in the battery under test in the first frequency range;

[0251] The execution module 404 is specifically configured to: when there is a micro short circuit in the battery under test in the first frequency range, reduce the charging current of the battery under test and output a reminder message;

[0252] Wherein, the reminder message is used to instruct the user to replace the battery under test within a preset time.

[0253] In some embodiments, the variation parameter includes: a third amplitude by which the actual impedance value increases in the second frequency range;

[0254] The second determination unit is specifically configured to: when the third amplitude is greater than a preset third threshold, determine that there is an interface layer abnormality in the test battery in the second frequency range;

[0255] The execution module 404 is specifically configured to: when there is an interface layer abnormality in the test battery in the second frequency range, reduce the charging current of the test battery and / or reduce the power consumption of the electronic device corresponding to the test battery.

[0256] In some embodiments, the variation parameter includes: a fourth amplitude by which the actual impedance value decreases in the second frequency range;

[0257] The second determination unit is specifically configured to: when the fourth amplitude is greater than a preset fourth threshold, determine that lithium plating occurs in the test battery in the second frequency range;

[0258] The execution module 404 is specifically configured to: when lithium plating occurs in the test battery in the second frequency range, reduce the charging current of the test battery.

[0259] In some embodiments, the variation parameter includes: a fifth amplitude by which the actual impedance value increases in the third frequency range;

[0260] The second determination unit is specifically configured to: when the fifth amplitude is greater than a preset fifth threshold, determine that there is a positive electrode abnormality in the test battery in the third frequency range;

[0261] The execution module 404 is specifically configured to: when there is a positive electrode abnormality in the test battery in the third frequency range, reduce the charging cut-off voltage of the test battery.

[0262] In some embodiments, the variation parameter includes: a sixth amplitude by which the actual impedance value increases in the fourth frequency range;

[0263] The second determination unit is specifically configured to: when the sixth amplitude is greater than a preset sixth threshold, determine that there is a positive electrode abnormality in the test battery in the fourth frequency range;

[0264] The execution module 404 is specifically configured to: when there is a positive electrode abnormality in the test battery in the fourth frequency range, reduce the charging cut-off voltage of the test battery.

[0265] Regarding the device in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be elaborated here.

[0266] Figure 5 is a hardware structure block diagram of an electronic device shown according to an exemplary embodiment Figure 1 . For example, the electronic device 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0267] Referring to Figure 5 , the electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0268] The processing component 802 generally controls the overall operation of the electronic device 800, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the above method. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.

[0269] The memory 804 is configured to store various types of data to support the operation of the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, contact data, phone book data, messages, pictures, videos, etc. The memory 804 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0270] The power supply component 806 provides power to various components of the electronic device 800. The power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800.

[0271] The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can sense not only the boundaries of the touch or swipe actions, but also detect the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 808 includes a front camera and / or a rear camera. When the electronic device 800 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0272] The audio component 810 is configured to output and / or input audio signals. For example, the audio component 810 includes a microphone (MIC) that is configured to receive external audio signals when the electronic device 800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 further includes a speaker for outputting audio signals.

[0273] The I / O interface 812 provides an interface between the processing component 802 and a peripheral interface module, and the peripheral interface module can be a keyboard, a click wheel, buttons, etc. These buttons can include, but are not limited to: a home button, a volume button, a power button, and a lock button.

[0274] The sensor component 814 includes one or more sensors for providing status assessments of various aspects of the electronic device 800. For example, the sensor component 814 can detect the on / off state of the electronic device 800, the relative positioning of components, such as the display and keypad of the electronic device 800. The sensor component 814 can also detect a change in the position of the electronic device 800 or a component of the electronic device 800, the presence or absence of user contact with the electronic device 800, the orientation or acceleration / deceleration of the electronic device 800, and the temperature change of the electronic device 800. The sensor component 814 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 814 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 814 can further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0275] The communication component 816 is configured to facilitate communication between the electronic device 800 and other devices in a wired or wireless manner. The electronic device 800 can access a communication standard-based wireless network, such as WiFi, 4G, or 5G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra-Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0276] In an exemplary embodiment, the electronic device 800 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above method.

[0277] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, and the above instructions can be executed by a processor 820 of the electronic device 800 to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, Random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0278] A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor, is capable of executing a battery protection method, and the method includes:

[0279] Determine the actual impedance values of a battery under test with a charge-discharge cycle count of a first cycle count in different frequency ranges, and the current first battery charge of the battery under test;

[0280] Based on the first cycle count, the first battery charge, and a preset relationship, determine the reference impedance values in the different frequency ranges; wherein the preset relationship is used to indicate the corresponding relationship between the battery charge, cycle count, and impedance value of a reference battery;

[0281] According to the actual impedance values and the reference impedance values in the different frequency ranges, determine whether the battery under test is in an abnormal state;

[0282] If the battery under test is in the abnormal state, execute the battery protection strategy corresponding to the abnormal state.

[0283] An embodiment of the present disclosure provides a computer program product, which includes: a computer program or executable instructions, and the computer program or executable instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or executable instructions from the computer-readable storage medium, and the processor executes the computer program or executable instructions, so that the computer device executes any one of the above battery protection methods of the embodiments of the present disclosure.

[0284] Figure 6 is a hardware structure block diagram of an electronic device shown according to an exemplary embodiment Figure 2 . For example, the device 1900 (electronic device) may be provided as a server. Referring to Figure 6 , the device 1900 includes a processing component 1922, which further includes one or more processors, and memory resources represented by a memory 1932 for storing instructions executable by the processing component 1922, such as application programs. The application programs stored in the memory 1932 may include one or more modules each corresponding to a set of instructions. In addition, the processing component 1922 is configured to execute instructions to perform the above battery protection method.

[0285] The device 1900 may further include a power supply component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input / output (I / O) interface 1958. The device 1900 may operate based on an operating system stored in the memory 1932, such as Windows ServerTM, MacOS XTM, UnixTM, LinuxTM, FreeBSDTM or the like.

[0286] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0287] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A battery protection method, characterized in that, Including: Determining the actual impedance values of a battery under test with the number of charge-discharge cycles being the first number of cycles in different frequency ranges, and the current first state of charge of the battery under test; Based on the first number of cycles, the first state of charge, and a preset relationship, determining the reference impedance values in the different frequency ranges; wherein, the preset relationship is used to indicate the corresponding relationship among the state of charge, the number of cycles, and the impedance value of a reference battery; According to the actual impedance values and the reference impedance values in the different frequency ranges, determining whether the battery under test is in an abnormal state; If the battery under test is in the abnormal state, then implementing the battery protection strategy corresponding to the abnormal state.

2. The method according to claim 1, wherein The determining whether the battery under test is in an abnormal state according to the actual impedance values and the reference impedance values in the different frequency ranges includes: According to the magnitude relationship between the actual impedance values and the reference impedance values in the different frequency ranges, respectively determining the change parameters of the actual impedance values in each of the frequency ranges; wherein, the change parameters include: change amplitude and / or change speed; According to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges, determining whether the battery under test is in an abnormal state in each of the frequency ranges; Wherein, the different frequency ranges include: a first frequency range, a second frequency range, a third frequency range, and a fourth frequency range; the frequency in the first frequency range is greater than the frequency in the second frequency range, the frequency in the second frequency range is greater than the frequency in the third frequency range, and the frequency in the third frequency range is greater than the frequency in the fourth frequency range.

3. The method according to claim 2, wherein The change parameter includes: a first amplitude by which the actual impedance value increases in the first frequency range; The determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes: When the first amplitude is greater than a preset first threshold, determining that electrolyte abnormality occurs in the battery under test in the first frequency range; The implementing the battery protection strategy corresponding to the abnormal state includes: When electrolyte abnormality occurs in the battery under test in the first frequency range, reducing the charging current and / or the charging cut-off voltage of the battery under test.

4. The method according to claim 2, wherein The change parameter includes: a second amplitude by which the actual impedance value decreases in the first frequency range; The determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes: When the second amplitude is greater than a preset second threshold, determining that a micro short circuit occurs in the battery under test in the first frequency range; The implementing the battery protection strategy corresponding to the abnormal state includes: When a micro short circuit occurs in the battery under test in the first frequency range, reducing the charging current of the battery under test and outputting a reminder message; Wherein, the reminder information is used to indicate the user to replace the battery under test within a preset time.

5. The method according to claim 2, characterized in that The change parameter includes: a third amplitude of the increase in the actual impedance value in the second frequency range; Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes: When the third amplitude is greater than a preset third threshold, it is determined that an interfacial layer abnormality occurs in the battery under test in the second frequency range; Executing the battery protection strategy corresponding to the abnormal state includes: When an interfacial layer abnormality occurs in the battery under test in the second frequency range, reducing the charging current of the battery under test and / or reducing the power consumption of the electronic device corresponding to the battery under test.

6. The method according to claim 2, characterized in that, The change parameter includes: a fourth amplitude of the decrease in the actual impedance value in the second frequency range; Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes: When the fourth amplitude is greater than a preset fourth threshold, it is determined that lithium plating occurs in the battery under test in the second frequency range; Executing the battery protection strategy corresponding to the abnormal state includes: When lithium plating occurs in the battery under test in the second frequency range, reducing the charging current of the battery under test.

7. The method according to claim 2, wherein The change parameter includes: a fifth amplitude of the increase in the actual impedance value in the third frequency range; Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes: When the fifth amplitude is greater than a preset fifth threshold, it is determined that a positive electrode abnormality occurs in the battery under test in the third frequency range; Executing the battery protection strategy corresponding to the abnormal state includes: When a positive electrode abnormality occurs in the battery under test in the third frequency range, reducing the charging cut-off voltage of the battery under test.

8. The method according to claim 2, wherein The change parameter includes: a sixth amplitude of the increase in the actual impedance value in the fourth frequency range; Determining whether the battery under test is in an abnormal state in each of the frequency ranges according to the change amplitude in each of the frequency ranges and / or the change speed in each of the frequency ranges includes: When the sixth amplitude is greater than a preset sixth threshold, it is determined that a positive electrode abnormality occurs in the battery under test in the fourth frequency range; Executing the battery protection strategy corresponding to the abnormal state includes: When a positive electrode abnormality occurs in the battery under test in the fourth frequency range, reducing the charging cut-off voltage of the battery under test.

9. A battery protection device, characterized in that, Includes: A first determination module, configured to determine the actual impedance value of the battery under test with the charge-discharge cycle number being the first cycle number in different frequency ranges, and the current first battery level of the battery under test; A second determination module, configured to determine a reference impedance value in the different frequency ranges based on the first number of cycles, the first battery power, and a preset relationship; wherein the preset relationship is used to indicate the corresponding relationship between the power, the number of cycles, and the impedance value of a reference battery; A third determination module, configured to determine whether the battery under test is in an abnormal state according to the actual impedance value and the reference impedance value in the different frequency ranges; An execution module, configured to execute a battery protection strategy corresponding to the abnormal state if the battery under test is in the abnormal state.

10. An electronic device, characterized in that, Comprising: A processor; A memory for storing instructions executable by the processor; Wherein the processor is configured to: when executed, implement the steps of the method according to any one of claims 1 to 8 above.

11. A non-transitory computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor, the steps of the method according to any one of claims 1 to 8 above can be executed.

12. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by the processor, the steps of the method according to any one of claims 1 to 8 above are implemented.

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