Charging control method, terminal and computer readable medium

Abstract

The invention provides a charging control method, which comprises the following steps: obtaining a current impedance value of a group of impedance parameters of a battery, the group of impedance parameters being composed of at least one impedance parameter; determining a current index in an electrochemical impedance spectroscopy data model according to the charging state information of the battery; according to the current impedance value, the current impedance value is compared with a preset impedance parameter value corresponding to the current index, and the electrochemical impedance spectroscopy data model comprises the preset impedance parameter values of the group of impedance parameters corresponding to different indexes; and determining the charging current according to the comparison result. The invention further provides a terminal and a computer readable medium.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technology, and in particular to a charging control method, a terminal, and a computer-readable medium. Background Art

[0002] Batteries are widely used in daily life, and fast charging technology is a key technology to improve user experience. Fast charging mainly includes high-voltage fast charging and low-voltage high-current fast charging. During fast charging, the current entering the battery will increase, which will increase the battery temperature due to heat loss. If the battery is in a high temperature state for a long time, it will accelerate aging, affect the battery life, and also pose a safety risk.

[0003] With the development of fast charging technology, the power of fast charging is constantly increasing, and the life and safety issues caused by the increase in battery temperature caused by fast charging are becoming more prominent. How to perform fast charging without affecting battery life and ensuring safety has become an important direction of industry research. Summary of the invention

[0004] Embodiments of the present disclosure provide a charging control method, a terminal, and a computer-readable medium.

[0005] In a first aspect, an embodiment of the present disclosure provides a charging control method, comprising: obtaining a current impedance value of a set of impedance parameters of a battery, wherein the set of impedance parameters consists of at least one impedance parameter; determining a current index in an electrochemical impedance spectrum data model based on charging state information of the battery; comparing the current impedance value with a preset impedance parameter value corresponding to the current index, wherein the electrochemical impedance spectrum data model includes preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes; and determining a charging current based on the comparison result.

[0006] In a second aspect, an embodiment of the present disclosure provides a terminal, comprising: one or more processors; a memory on which one or more programs are stored, and when the one or more programs are executed by the one or more processors, the one or more processors implement the charging control method described in the first aspect of the embodiment of the present disclosure.

[0007] In a third aspect, an embodiment of the present disclosure provides a computer-readable medium having a computer program stored thereon, and when the program is executed by a processor, the charging control method described in the first aspect of the embodiment of the present disclosure is implemented.

[0008] In the charging control method provided in the embodiment of the present disclosure, by monitoring the current impedance value of a set of impedance parameters of the battery and comparing them with the preset impedance parameter values ​​in the electrochemical impedance spectroscopy data model, the change of the internal state of the battery can be determined, and then the charging current can be adjusted according to the change of the internal state of the battery. A charging current can be obtained that can both reduce the safety risks caused by the deterioration of the internal state of the battery and shorten the charging time as much as possible, thereby achieving fast charging while ensuring the battery life and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a flow chart of a charging control method in an embodiment of the present disclosure;

[0010] Figure 2 is a flowchart of some steps in another charging control method in an embodiment of the present disclosure;

[0011] Figure 3 is a flowchart of some steps in another charging control method in an embodiment of the present disclosure;

[0012] Figure 4 is a flowchart of some steps in another charging control method in an embodiment of the present disclosure;

[0013] Figure 5 is a schematic diagram of an equivalent circuit of a battery in an embodiment of the present disclosure;

[0014] Figure 6 is a schematic diagram of impedance of a battery in an embodiment of the present disclosure;

[0015] Figure 7 is a flowchart of some steps in another charging control method in an embodiment of the present disclosure;

[0016] Figure 8 is a schematic diagram of the composition of a terminal in an embodiment of the present disclosure;

[0017] Fig. 9 is a schematic diagram of the composition of a computer-readable medium in an embodiment of the present disclosure;

[0018] Fig.10 is a schematic diagram of a fast charging system architecture in an embodiment of the present disclosure;

[0019] Fig.11 is a schematic diagram of charging control in an embodiment;

[0020] Fig.12 is a schematic diagram of charging control in another embodiment. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the charging control method, terminal, and computer-readable medium provided by the present disclosure are described in detail below in conjunction with the accompanying drawings.

[0022] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0023] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0024] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0026] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.

[0027] In some related technologies, the core of fast charging technology is to increase the output power of the charger within the charging curve range supported by the battery, thereby increasing the charging current of the battery and shortening the charging time. There are two ways for the charger to output high power: high output voltage and low voltage and high current.

[0028] High output voltage increases the output power of the charger by increasing the output voltage of the charger. Under the same input current, the terminal's charging conversion chip obtains a larger input power due to the high input voltage, converts a larger output current, so that the battery obtains a larger charging current and shortens the charging time. During the charging process, the terminal's charging algorithm implementation control unit notifies the charger to output a suitable high voltage based on the detected status of the battery and the charging conversion chip; the high voltage is transmitted to the terminal's charging conversion chip, which converts a voltage suitable for the battery and the corresponding current to charge the battery.

[0029] Low voltage and high current increases the output power of the charger by increasing the output current of the charger, and the battery can also obtain a larger charging current. The main way to achieve low voltage and high current is direct charging, that is, the charger directly charges the battery. When the charging process enters the fast charging stage, the terminal's charging algorithm implementation control unit detects the battery status and notifies the charger to output the appropriate current and voltage to directly charge the battery.

[0030] During the charging process, the charging current adjustment process of the above two methods is mainly based on the battery charging curve provided by the battery manufacturer, and lacks monitoring of the battery charging status. The chemical reactions of the electrolyte, active substances, etc. inside the battery will undergo irreversible changes due to the influence of temperature. Once the charging current exceeds the acceptable range, it will accelerate the aging of the battery and shorten the battery life. For example, lithium batteries are high-energy density batteries. If there is a lack of monitoring of the lithium battery status, when the impedance inside the lithium battery exceeds a certain threshold, the heat caused by high current charging will cause safety hazards to the lithium battery.

[0031] Some battery application scenarios use a combination of multiple batteries in series or series / parallel. This combination only uses one overcharge / over-discharge protection unit. Compared with a single-cell battery, this protection unit cannot provide protection based on the state changes of each battery cell. In some related technologies, the voltage of each battery cell in the combination is monitored to prevent overcharging caused by abnormalities in a single battery cell during charging, but the resistance of the electrolyte in the battery and the transfer resistance of ions cannot be monitored. The safety hazard caused by internal heating of the battery due to excessive current during charging still exists.

[0032] In view of this, firstly, refer to Figure 1 , the present disclosure provides a charging control method, which may include:

[0033] S1. Obtaining a current impedance value of a set of impedance parameters of a battery, wherein the set of impedance parameters consists of at least one impedance parameter;

[0034] S2. determining a current index in an electrochemical impedance spectroscopy data model according to the charging state information of the battery;

[0035] S3. comparing the current impedance value with a preset impedance parameter value corresponding to the current index, wherein the electrochemical impedance spectroscopy data model includes preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes;

[0036] S4. Determine the charging current according to the comparison result.

[0037] The embodiment of the present disclosure does not specifically limit the impedance parameters that constitute a set of impedance parameters of the battery. For example, a set of impedance parameters is composed of at least one of the impedance parameters such as electrolyte impedance, diaphragm impedance, charge transfer impedance, diffusion impedance, etc.

[0038] In the embodiment of the present disclosure, the current impedance value of a set of impedance parameters refers to the value of each impedance parameter of the battery currently monitored.

[0039] In the disclosed embodiment, an electrochemical impedance spectroscopy data model is pre-established in combination with the impedance characteristics of the battery, and a preset impedance parameter value corresponding to a set of impedance parameters of the battery is determined in the electrochemical impedance spectroscopy data model. When the battery is charged, the deviation of the current impedance value of each impedance parameter relative to the preset impedance parameter value of the impedance parameter in the electrochemical impedance spectroscopy data model can be obtained by monitoring the battery to reflect the change in the internal state of the battery.

[0040] The embodiments of the present disclosure do not specifically limit the preset impedance parameter value of the impedance parameter. For example, the preset impedance parameter value includes but is not limited to a preset impedance value, a preset impedance change value, and the like.

[0041] In the disclosed embodiment, the index is used to characterize the charging state of the battery, such as the number of charging times, the battery voltage, etc. In the disclosed embodiment, when comparing the current impedance value with the preset impedance parameter value in the electrochemical impedance spectroscopy data model, the current impedance value is compared with the preset impedance parameter value corresponding to the same charging state. For example, with the number of charging times + battery voltage as the index, the current number of charging times is the 22nd time and the battery voltage is 3.5V. The preset impedance parameter value corresponding to the number of charging times of 22 times and the battery voltage of 3.5V is searched in the electrochemical impedance spectroscopy data model and compared.

[0042] In the disclosed embodiment, the change of the internal state of the battery can be determined by comparing the current impedance value with the preset impedance parameter value in the electrochemical impedance spectroscopy data model; the charging current is determined according to the comparison result, that is, the charging current is adjusted according to the change of the internal state of the battery. For example, when the comparison result indicates that the internal state of the battery has deteriorated, the charging current is reduced; when the comparison result indicates that the internal state of the battery has not deteriorated, the charging current is increased.

[0043] In the embodiments of the present disclosure, by monitoring the internal state of the battery and adjusting the charging current according to changes in the internal state of the battery, a charging current can be obtained that can both reduce the safety risks caused by deterioration of the internal state of the battery and shorten the charging time as much as possible, thereby achieving fast charging while ensuring the battery life and safety.

[0044] The embodiments of the present disclosure do not impose any special restrictions on the preset impedance parameter values ​​in the electrochemical impedance spectroscopy data model.

[0045] In some embodiments, the preset impedance parameter includes a preset impedance change value, and the preset impedance change value is a change value of the electrochemical impedance of the battery when the battery is charged with a maximum current supported by the battery.

[0046] Accordingly, in some embodiments, reference Figure 2 , comparing the current impedance value with a preset impedance parameter value corresponding to the current index, including:

[0047] S311, determining a current impedance change value of the set of impedance parameters according to the current impedance value;

[0048] S312. Compare the current impedance change value with a preset impedance change value corresponding to the current index, wherein the electrochemical impedance spectroscopy data model includes an impedance change sub-data model, and the preset impedance parameter value in the impedance change sub-data model includes a preset impedance change value.

[0049] The embodiment of the present disclosure does not specifically limit the impedance change sub-data model. In some embodiments, the impedance change sub-data model is in the form shown in Table 1.

[0050] Table 1

[0051]

[0052] In Table 1, ΔRb represents the change in electrolyte impedance, ΔZ sei Indicates the change in diaphragm impedance, ΔZ ct Indicates the change in charge transfer impedance, ΔZ w represents the change value of diffusion impedance; B represents the specific change value, for example, B 1y_3.3 Indicates the change in electrolyte impedance when the battery voltage is 3.3V, B 2y_3.3 Indicates the change in the impedance of the diaphragm when recording Y and the battery voltage is 3.3V, B 3y_3.3 Indicates the change in charge transfer impedance when recording Y and the battery voltage is 3.3V, B 4y_3.3Indicates the change value of diffusion impedance when record Y and battery voltage is 3.3V; record Y corresponds to the number of charging times N to X, indicating that the charging times N to X correspond to a record of electrochemical impedance change. In the embodiment of the present disclosure, since the internal state of the battery is more likely to deteriorate when the battery is charged with the maximum current supported by the battery, and the degree of deterioration may be greater, the change value of the electrochemical impedance of the battery when the battery is charged with the maximum current supported by the battery is used as the preset impedance change value, which can be used as the upper limit for monitoring the change of the electrochemical impedance of the battery. When charging the battery, regardless of the size of the charging current, if the change of the electrochemical impedance of the battery exceeds this upper limit, it indicates that the internal state of the battery has deteriorated; if the change of the electrochemical impedance of the battery does not exceed this upper limit, it can be indicated that the internal state of the battery has not deteriorated.

[0053] Accordingly, in some embodiments, reference Figure 2 , the charging current is determined according to the comparison result, including:

[0054] S411, reducing the charging current when the current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds the preset impedance change value of the impedance parameter corresponding to the current index;

[0055] S412: When the current impedance change value of each impedance parameter in the group of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, increase the charging current.

[0056] In the embodiments of the present disclosure, if the current impedance change value of any one or more impedance parameters exceeds their respective preset impedance change values, it indicates that the internal state of the battery has deteriorated, and reducing the charging current is beneficial to reducing safety risks; if the current impedance change value of each impedance parameter does not exceed its respective preset impedance change value, it indicates that the internal state of the battery has not deteriorated, and therefore the charging current can be increased, which is beneficial to shorten the charging time for fast charging.

[0057] In the disclosed embodiment, the charging current is gradually reduced until the current impedance change value is less than the preset impedance change value; and the charging current is gradually increased until the maximum value is reached so that the current impedance change value does not exceed the preset impedance change value.

[0058] In the embodiment of the present disclosure, through steps S411 and S412, a charging current can be obtained that can reduce the safety risk caused by the deterioration of the internal state of the battery and shorten the charging time as much as possible.

[0059] In some embodiments, when the current impedance change value of each impedance parameter does not exceed the respective preset impedance change value, the charging current is gradually increased; when the charging current increases to the maximum current supported by this charging, if the current impedance change value of each impedance parameter still does not exceed the respective preset impedance change value, the battery is charged with the maximum current supported by this charging.

[0060] Accordingly, in some embodiments, when the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, increasing the charging current includes:

[0061] When the charging current increases to a current peak value and the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is maintained at the current peak value.

[0062] In the disclosed embodiment, the current peak value is the maximum current supported by this charging. In some embodiments, the maximum current supported by this charging is the smaller of the maximum current output by the terminal after the charging power provided by the charger is converted and output, and the maximum charging current allowed by the charging curve of the battery.

[0063] In the embodiment of the present disclosure, the charging current at the start-up charging may be different according to the internal state of the battery at the start-up charging. Different charging currents at the start-up charging correspond to different charging current adjustment methods.

[0064] In some embodiments, charging is initiated at a current peak.

[0065] Accordingly, in some embodiments, determining the charging current according to the comparison result includes:

[0066] When charging is started, if the charging current is equal to the current peak value, and if the current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is reduced.

[0067] In an embodiment of the present disclosure, if the charging current when starting charging is equal to the current peak value, and the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter, the charging current is maintained at the current peak value to charge the battery.

[0068] In some embodiments, charging is initiated with a low current.

[0069] Accordingly, in some embodiments, determining the charging current according to the comparison result includes:

[0070] When charging is started, if the charging current is less than the current peak value, and if the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is increased;

[0071] When charging is started, if the charging current is less than the current peak value, and if the current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds the preset impedance change value of the impedance parameter corresponding to the current index, charging is stopped.

[0072] In some embodiments, an abnormality is reported when a current impedance change value of at least one impedance parameter in a set of impedance parameters exceeds a preset impedance change value of the impedance parameter corresponding to the current index.

[0073] In the disclosed embodiment, if the current impedance change value of any one or more impedance parameters exceeds the respective preset impedance change value when charging is started with a small current, it indicates that the internal state of the battery has deteriorated, and stopping charging is helpful to avoid safety risks.

[0074] In some embodiments, the preset impedance parameter includes a preset impedance value.

[0075] Accordingly, in some embodiments, comparing the current impedance value with a preset impedance parameter value corresponding to the current index may include:

[0076] The current impedance value is compared with a preset impedance value corresponding to the current index, wherein the electrochemical impedance spectroscopy data model includes an impedance spectroscopy sub-data model, and the preset impedance parameter value in the impedance spectroscopy sub-data model includes a preset impedance value.

[0077] The embodiment of the present disclosure does not specifically limit the impedance spectrum sub-data model. In some embodiments, the impedance spectrum sub-data model is in the form shown in Table 2.

[0078] Table 2

[0079]

[0080] In Table 2, Rb represents the electrolyte impedance, Z sei represents the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents diffusion impedance; A represents the specific impedance value, for example, A 1n_3.3 Indicates the value of electrolyte impedance when the battery voltage is 3.3V for the Nth charge, A 2n_3.3 Indicates the value of the diaphragm impedance when the battery voltage is 3.3V for the Nth charge, A 3n_3.3 Indicates the value of charge transfer impedance when the battery voltage is 3.3V for the Nth charge, A4n_3.3 It indicates the diffusion impedance value when the battery voltage is 3.3V at the Nth charge.

[0081] In the disclosed embodiment, the change of the ambient temperature of the battery will affect the transfer of internal charge of the battery and the deintercalation of ions in the electrode active material. Based on the impedance spectrum sub-data model, the adjustment ratio of the electrochemical impedance of the battery with the ambient temperature is determined, and then the correction parameters corresponding to different ambient temperatures are determined to correct the preset impedance value in the impedance spectrum sub-data model according to the current ambient temperature.

[0082] Accordingly, in some embodiments, reference Figure 3 , comparing the current impedance value with the preset impedance value corresponding to the current index, including:

[0083] S321, obtaining the current ambient temperature of the battery;

[0084] S322, determining correction parameters corresponding to the current ambient temperature and the current index in the temperature-related sub-data model, wherein the electrochemical impedance spectroscopy data model includes the temperature-related sub-data model, and the temperature-related sub-data model includes correction parameters corresponding to different ambient temperatures and different indexes;

[0085] S323, correcting the preset impedance value corresponding to the current index according to the current ambient temperature and the correction parameter corresponding to the current index;

[0086] S324: Compare the current impedance value with the preset impedance value corresponding to the corrected current index.

[0087] In the disclosed embodiment, the preset impedance parameter value is corrected using a correction parameter, and then the current impedance value is compared with the corrected preset impedance value, which can more accurately reflect the internal state of the battery at the current ambient temperature, thereby enabling more precise adjustment of the charging current.

[0088] The embodiment of the present disclosure does not specifically limit the temperature-related sub-data model. In some embodiments, the temperature-related sub-data model is in the form shown in Table 3.

[0089] Table 3

[0090]

[0091] In Table 2, Rb represents the electrolyte impedance, Z sei represents the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents diffusion impedance; K represents a specific correction parameter, for example, K 1m_3.3 Indicates the correction parameters of recording M, battery voltage 3.3V electrolyte impedance, K 2m_3.3Indicates the record M, battery voltage 3.3V, diaphragm impedance correction parameters, K 3m_3.3 Indicates the record M, the battery voltage 3.3V charge transfer impedance correction parameter, K 4m_3.3 It indicates the correction parameters of diffusion impedance when recording M and battery voltage is 3.3V.

[0092] The disclosed embodiment does not specifically limit how to correct the preset impedance value corresponding to the current index according to the current ambient temperature and the correction parameter corresponding to the current index. For example, taking the preset impedance value in the impedance spectrum sub-data model determined at an ambient temperature of 25°C as an example, the preset impedance value is corrected using the following formula:

[0093]

[0094] Among them, K m is the correction parameter, θ is the current ambient temperature, Z represents the preset impedance value in the impedance spectrum sub-data model, and Z ′ (θ) is the corrected preset impedance value.

[0095] In some embodiments, reference Figure 3 , the charging current is determined according to the comparison result, including:

[0096] S421, when the current impedance value of each impedance parameter in the set of impedance parameters is less than the preset impedance value of the impedance parameter corresponding to the corrected current index, when starting charging, the charging current is made equal to the current peak value;

[0097] S422: When the current impedance value of at least one impedance parameter in the set of impedance parameters is greater than the preset impedance value of the impedance parameter corresponding to the corrected current index, when charging is started, the charging current is made smaller than the current peak value.

[0098] In some embodiments, reference Figure 4 After obtaining the current impedance value of at least one impedance parameter of the battery, the charging control method further includes:

[0099] S51, comparing the current impedance value with the safe impedance value;

[0100] S52, stopping charging when the current impedance value of at least one impedance parameter in the set of impedance parameters exceeds the safe impedance value corresponding to the impedance parameter;

[0101] S53: Start charging when the current impedance value of each impedance parameter in the set of impedance parameters does not exceed the safe impedance value corresponding to the impedance parameter.

[0102] In some embodiments, an abnormality is reported when a current impedance value of at least one impedance parameter in a set of impedance parameters exceeds a safe impedance value corresponding to the impedance parameter.

[0103] In the disclosed embodiment, charging is stopped when the current impedance value of any one or more impedance parameters exceeds the safe impedance, and charging is started only when the current impedance value of each impedance parameter does not exceed the safe impedance, which is helpful to reduce safety risks.

[0104] The embodiments of the present disclosure do not specifically limit the safety impedance. For example, the safety impedance is provided by the battery manufacturer or set based on experience.

[0105] The disclosed embodiment does not impose any special limitation on the index in the electrochemical impedance spectroscopy data model.

[0106] In some embodiments, the index in the electrochemical impedance spectroscopy data model includes at least one of a battery voltage and a charging number; determining a current index according to the charging state information of the battery includes:

[0107] At least one of a current battery voltage and a current charging number of the battery is determined to obtain the current index.

[0108] For example, as shown in Table 2, the number of charging times + battery voltage is used as the index.

[0109] In some embodiments, the index in the electrochemical impedance spectroscopy data model includes the number of charging times; and the charging control method further includes:

[0110] When charging is started, obtain the current charging times;

[0111] When charging is finished, the current charging times are updated.

[0112] In the embodiment of the present disclosure, updating the number of charging times means updating the degree of battery aging; using the number of charging times as an index of the electrochemical impedance spectroscopy data model can take into account the degree of battery aging when monitoring the internal state of the battery, thereby being able to more accurately reflect the internal state of the battery at the current ambient temperature, and facilitating more precise adjustment of the charging current.

[0113] The embodiment of the present disclosure does not impose any special limitation on the impedance parameters constituting a set of impedance parameters.

[0114] In some embodiments, the battery is equivalent to Figure 5 The circuit model shown in Figure 5 In, R b represents ohmic resistance, corresponding to the electrolyte impedance in the battery; Rsei represents the diaphragm resistance, Rct represents the charge transfer resistance, C DL represents the electric double layer capacitance; Rw represents the diffusion resistance of ions in the electrode material.

[0115] In the embodiment of the present disclosure, by applying a sinusoidal excitation current (excitation signal) of a certain frequency to the battery, a sinusoidal voltage signal can be detected at both ends of the battery, and the ratio of the detected voltage signal to the excitation current is the impedance value of the battery. Figure 5 When the excitation signal is a high frequency signal (for example, more than 1KHz), it mainly manifests as R b When the excitation signal is an intermediate frequency signal (for example, 1Hz to 1KHz), Rsei and C DL Impedance, Rct and C DL When the excitation signal is a low-frequency signal (for example, below 1 Hz), the impedance of Rw is dominant. Figure 6 The figure shows the relationship between the electrochemical impedance of the battery and the frequency of the excitation signal. Each point represents the impedance value of the excitation signal corresponding to a certain frequency. As the frequency of the excitation signal increases, the electrochemical impedance of the battery is expressed as electrolyte impedance Rb, diaphragm impedance Z sei , charge transfer impedance Z ct , diffusion impedance Z w .

[0116] Accordingly, in some embodiments, the impedance parameters constituting a set of impedance parameters include at least one of electrolyte impedance, membrane impedance, charge transfer impedance, and diffusion impedance.

[0117] In some embodiments, reference Figure 7 , the charging control method further includes:

[0118] S6. Obtain preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes, and establish the electrochemical impedance spectroscopy data model.

[0119] In some embodiments, establishing the electrochemical impedance spectroscopy data model comprises:

[0120] Obtaining preset impedance values ​​of at least one set of impedance parameters corresponding to different charging times and different battery voltages, and establishing an impedance spectrum sub-data model;

[0121] An impedance variation sub-data model is established according to the impedance spectrum sub-data model, wherein the impedance variation sub-data model includes preset impedance variation values ​​of the at least one impedance parameter corresponding to different charging times and different battery voltages.

[0122] In some embodiments, establishing the electrochemical impedance spectroscopy data model further includes:

[0123] A temperature-related sub-data model is established according to the impedance spectrum sub-data model, wherein the temperature-related sub-data model includes correction parameters corresponding to different ambient temperatures and different battery voltages.

[0124] In some embodiments, the impedance spectrum sub-data model is in the form of Table 2, the impedance change sub-data model is in the form of Table 1, and the temperature correlation sub-data model is in the form of Table 3, that is, Table 1, Table 2, and Table 3 together constitute the electrochemical impedance spectroscopy data model.

[0125] Second, refer to Figure 8 , an embodiment of the present disclosure provides a terminal, which includes:

[0126] One or more processors 101;

[0127] A memory 102 storing one or more programs, which, when executed by one or more processors, enables the one or more processors to implement the charging control method according to the first aspect of the embodiment of the present disclosure;

[0128] One or more I / O interfaces 103 are connected between the processor and the memory and are configured to implement information exchange between the processor and the memory.

[0129] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU) and the like; the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus) and the like.

[0130] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0131] Fourthly, refer to Fig. 9 An embodiment of the present disclosure provides a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the charging control method described in the first aspect of the embodiment of the present disclosure is implemented.

[0132] In order to enable those skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present disclosure, the technical solutions provided by the embodiments of the present disclosure are described in detail below through specific embodiments:

[0133] Embodiment 1

[0134] Fig.10 : is a schematic diagram of the fast charging system architecture in this embodiment. In this embodiment, the fast charging system architecture includes two parts: a charger and a terminal; the charger part includes a power management unit and a power conversion output unit; the terminal part includes a power conversion unit, a charging management unit, an electrochemical impedance spectroscopy detection unit and a temperature detection unit; the charger and the terminal are connected by a charging cable, and the charging cable consists of a power line, a communication line and a ground line.

[0135] Charger part: The power management unit is used to communicate and identify with the terminal to be charged before charging, and controls the power conversion output unit according to the communicated information during the charging process; the power conversion output unit outputs accurate voltage and current according to the information communicated by the power management unit.

[0136] Terminal part: The charging management unit interacts with the charger to identify, detects the ambient temperature and voltage of the battery, controls the electrochemical impedance spectroscopy unit to detect the battery, controls the power conversion unit and establishes suitable charging parameters based on the electrochemical impedance spectrum of the battery obtained by the detection; the power conversion unit converts the input voltage and current into a voltage and current suitable for the battery according to the obtained charging parameters; the electrochemical impedance spectroscopy detection unit is used to detect the electrochemical impedance spectrum of the battery; the temperature detection unit is used to detect the ambient temperature of the battery.

[0137] The power management unit of the charger is used to interact with the terminal to be charged before charging, which not only indicates that the charger has the ability to output specific power according to the needs of the terminal, but also can know whether the terminal needs specific power output. When the power management unit fails to communicate and identify with the terminal to be charged, the power management unit controls the power conversion output unit to output power according to the standard specifications of the charger. The power management unit can be a functional circuit implemented by a microprocessor chip or a chip that supports a certain protocol (such as the TYPE-C PD protocol); the power conversion output unit can be implemented by a programmable power chip or a circuit that supports adjustable voltage and current.

[0138] The charging management unit of the terminal communicates and interacts with the charger to learn the power output capacity of the charger; the temperature detection unit detects the ambient temperature of the battery, controls the electrochemical impedance spectrum detection unit to detect the electrochemical impedance spectrum of the battery, and compares it with the pre-established battery electrochemical impedance spectrum model table (electrochemical impedance spectrum data model); according to the degree of deviation of the battery electrochemical impedance spectrum, the charging current is adjusted accordingly. The power conversion unit performs power conversion based on the received charging current parameters and the detected battery voltage parameters, input voltage and current.

[0139] Electrochemical impedance spectroscopy is a method for online detection of internal battery parameters. When a sinusoidal excitation current of a certain frequency is applied to the battery, a sinusoidal voltage signal can be detected at both ends of the battery. The change in the ratio of the detected voltage signal to the excitation current is the electrochemical impedance spectrum of the battery.

[0140] The battery is equivalent to Figure 5 The circuit model shown in Figure 5 In, R b represents ohmic resistance, corresponding to the electrolyte impedance in the battery; Rsei represents the diaphragm resistance, Rct represents the charge transfer resistance, C DL represents the electric double layer capacitance; Rw represents the diffusion resistance of ions in the electrode material. By applying a sinusoidal excitation current (excitation signal) of a certain frequency to the battery, a sinusoidal voltage signal can be detected at both ends of the battery. The ratio of the detected voltage signal to the excitation current is the impedance value of the battery. Figure 5 When the excitation signal is a high frequency signal (for example, more than 1KHz), it mainly manifests as R b When the excitation signal is an intermediate frequency signal (for example, 1Hz to 1KHz), Rsei and C DL Impedance, Rct and C DL When the excitation signal is a low-frequency signal (for example, below 1 Hz), the impedance of Rw is dominant. Figure 6 The figure shows the relationship between the electrochemical impedance of the battery and the frequency of the excitation signal. Each point represents the impedance value of the excitation signal corresponding to a certain frequency. As the frequency of the excitation signal increases, the electrochemical impedance of the battery is expressed as electrolyte impedance Rb, diaphragm impedance Z sei , charge transfer impedance Z ct , diffusion impedance Z w .

[0141] Embodiment 2

[0142] In this embodiment, taking a lithium battery as an example, before performing the fast charging function on the lithium battery, the electrochemical impedance spectrum of the lithium battery is modeled. Combined with the impedance characteristics of the lithium battery, an impedance spectrum table (impedance spectrum sub-data model) corresponding to the lithium battery is established, and in a natural environment with an initial temperature of 25°C, the battery cut-off voltage is 4.35V and the discharge cut-off voltage is 3.3V as an example, as shown in Table 4.

[0143] Table 4

[0144]

[0145] In Table 4, Rb represents the electrolyte impedance, Z sei represents the diaphragm impedance, Z ct represents the charge transfer impedance, Zw represents diffusion impedance; A represents the specific impedance value, for example, A 1n_3.3 Indicates the value of electrolyte impedance when the battery voltage is 3.3V for the Nth charge, A 2n_3.3 Indicates the value of the diaphragm impedance when the battery voltage is 3.3V for the Nth charge, A 3n_3.3 Indicates the value of charge transfer impedance when the battery voltage is 3.3V for the Nth charge, A 4n_3.3 It indicates the diffusion impedance value when the battery voltage is 3.3V at the Nth charge.

[0146] The change of electrochemical impedance of lithium battery also characterizes the aging process of lithium battery. Irreversible electrochemical change is the essence of lithium battery aging. When establishing the impedance spectrum table of lithium battery (impedance spectrum sub-data model), the impedance change and current change table (impedance change sub-data model) are established at the same time, as shown in Table 5. Combined with the records in Table 4, in a constant temperature environment of 25℃, charging with the maximum charging current Imax supported by the lithium battery at each stage, the electrochemical impedance change of lithium battery (for example, ΔRb=Rb x -Rb N >Rb 预设 ) exceeds the preset value, a corresponding record is generated.

[0147] Table 5

[0148]

[0149] In Table 5, ΔRb represents the change in electrolyte impedance, ΔZ sei Indicates the change in diaphragm impedance, ΔZ ct Indicates the change in charge transfer impedance, ΔZ w represents the change value of diffusion impedance; B represents the specific change value, for example, B 1y_3.3 Indicates the change in electrolyte impedance when the battery voltage is 3.3V, B 2y_3.3 Indicates the change in the impedance of the diaphragm when recording Y and the battery voltage is 3.3V, B 3y_3.3 Indicates the change in charge transfer impedance when recording Y and the battery voltage is 3.3V, B 4y_3.3 It indicates the change value of diffusion impedance when record Y and battery voltage is 3.3V; record Y corresponds to the number of charges from Nth to Xth, indicating that the charge from Nth to Xth corresponds to a record of electrochemical impedance change.

[0150] The change of the ambient temperature of the lithium battery will affect the transfer of internal charges in the battery and the deintercalation of lithium ions in the electrode active materials. In a natural environment with an initial temperature of 25°C, combined with the impedance spectrum table (impedance spectrum sub-data model) established in Table 4, the correction parameters of the impedance corresponding to different temperatures in the entire aging process are determined, and the temperature-related sub-data model is established, as shown in Table 6.

[0151] Table 6

[0152]

[0153] In Table 6, Rb represents the electrolyte impedance, Z sei represents the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents diffusion impedance; K represents a specific correction parameter, for example, K 1m_3.3 Indicates the correction parameters of recording M, battery voltage 3.3V electrolyte impedance, K 2m_3.3 Indicates the record M, battery voltage 3.3V, diaphragm impedance correction parameters, K 3m_3.3 Indicates the record M, the battery voltage 3.3V charge transfer impedance correction parameter, K 4m_3.3 It indicates the correction parameters of diffusion impedance when recording M and battery voltage is 3.3V.

[0154] Through Table 6, combined with Table 4 corresponding to the Nth charging process, we can know the adjustment ratio of the electrochemical impedance of the lithium battery with the ambient temperature, that is, the electrochemical correction parameter K of the lithium battery when the ambient temperature is θ℃ during the Nth charging process.

[0155] Use the following formula to make corrections:

[0156]

[0157] Among them, K m is the correction parameter, θ is the current ambient temperature, Z represents the preset impedance value in the impedance spectrum sub-data model, and Z′(θ) is the corrected preset impedance value.

[0158] Embodiment 3

[0159] Fig.11 It is a flowchart of charging control in this embodiment. After the charger is inserted, the charging process starts. The charging management unit of the terminal interacts with the charger to determine whether the inserted charger supports fast charging; if the interaction is successful, it means that the charger can support fast charging for the terminal, and the charging management unit obtains the maximum charging power and output voltage supported by the charger; if the interaction fails, the charger is set to a conventional charger by default, for example, the voltage output by the charger is 5V. In this embodiment, if the protocol supported by the charger is incompatible with the protocol supported by the terminal, the interaction will also fail, and the charger will also be set to a conventional charger by default in this case.

[0160] After determining the power output capacity of the charger, the charging management unit detects the voltage of the lithium battery and the ambient temperature of the lithium battery surface. According to the battery voltage and the number of charging times, the electrochemical impedance spectrum of the lithium battery before charging, which is composed of a set of preset impedance values ​​of impedance parameters, can be obtained according to the impedance spectrum sub-data model shown in Table 4. For example, the lithium battery is currently charged for the 22nd time, and the battery voltage is 3.5V. According to the impedance spectrum sub-data model shown in Table 4, the current electrochemical impedance spectrum of the lithium battery is obtained: Rb = A 122_3.5 =30mΩ, Z sei =A 222_3.5 =40mΩ, Z ct =A 322_3.5 =50mΩ, Z w =A 222_3.5 =70mΩ. The ambient temperature of the lithium battery surface can be obtained through thermistors on the lithium battery protection board. Combined with the impedance spectrum sub-data model shown in Table 4 and the temperature-related sub-data model shown in Table 6, the correction parameter Km is determined to estimate the electrochemical impedance spectrum Z'(θ) of the lithium battery at the current temperature. For example, if the ambient temperature is 30°C, the corresponding correction parameter K m_3.5 =1.1, the electrochemical impedance spectrum composed of the preset impedance value after correction is Rb'=A 122_3.5 =36.6mΩ, Z sei '=A 222_3.5 =48.8mΩ, Z ct '=A 322_3.5 =61mΩ, Z w '=A 222_3.5 =85.4mΩ. At the same time, the charging management unit enables the electrochemical impedance spectrum detection unit to detect the electrochemical impedance spectrum of the lithium battery. If the detected electrochemical impedance of the lithium battery exceeds the safe impedance, multiple repeated detections (for example, not less than 3 times) are performed to repeatedly determine whether the electrochemical impedance spectrum of the lithium battery exceeds the safe impedance spectrum Z 安全 , report the abnormality, and stop charging. The safety impedance spectrum can be provided by the battery manufacturer or based on experience. For example, when charging at the minimum current, the electrochemical impedance spectrum when the temperature rise is close to the allowable operating temperature threshold of the lithium battery is used as the safety impedance spectrum: Rb 安全 =60mΩ, Z sei安全 =80mΩ, Z ct安全 =100mΩ, Z w安全 =150mΩ.

[0161] When the electrochemical impedance spectrum of the lithium battery is detected to be within the safe impedance spectrum range, the charging management unit will start charging. The charging current adjustment scheme is as follows: Fig.12 If the electrochemical impedance spectrum Z of the current lithium battery TLower than the corrected electrochemical impedance spectrum Z'(θ) of the lithium battery, start charging with a charging current equal to the peak current, the peak current being the smaller of the maximum current output by the terminal conversion of the charging power provided by the charger and the maximum charging current allowed by the battery's charging curve. The power conversion unit mainly achieves fast charging in three ways: inductive power conversion, direct charging load switch, and half-voltage switch capacitor array. The direct charging load switch and half-voltage switch capacitor array have high conversion efficiency, and the output current and input current are linearly proportional. During the fast charging process, the charging management unit periodically detects the electrochemical impedance of the lithium battery in order to monitor the change ΔZ of the electrochemical impedance of the lithium battery during the charging process. If the change ΔZ of the electrochemical impedance of the lithium battery exceeds the change ΔZ of the chemical impedance of the lithium battery during the maximum current charging process 建模 , then the charging current needs to be gradually reduced until the change in the electrochemical impedance of the lithium battery during fast charging does not exceed the change in the electrochemical impedance of the lithium battery during the modeled charging process. ΔZ 建模 It can be obtained according to the impedance change sub-data model shown in Table 5.

[0162] If the electrochemical impedance spectrum Z of the current lithium battery T If the corrected electrochemical impedance spectrum Z'(θ) of the lithium battery is exceeded, charging is started at a low current, such as a 0.2C rate charging current. At the same time, the charging management unit detects the change in electrochemical impedance ΔZ of the lithium battery during low current charging. If the change in electrochemical impedance ΔZ of the lithium battery exceeds ΔZ during low current charging, 建模 , it indicates that the lithium battery has deteriorated internally. For safety reasons, the charging management unit reports an abnormality and stops charging. If the electrochemical impedance change ΔZ of the lithium battery is lower than ΔZ 建模 , the charging current is gradually increased, and the electrochemical impedance change of the lithium battery is detected at the same time, until the electrochemical impedance change ΔZ of the lithium battery exceeds ΔZ 建模 , then the charging current is restored to the previous charging current. It is also possible that the charging current is increased to the maximum charging current that can be supported (the charging power provided by the charger is passed through the output current of the power conversion unit and the charging current allowed by the charging curve of the lithium battery), and the electrochemical impedance change ΔZ of the lithium battery is lower than ΔZ 建模 In this case, the charging current is at the maximum charging current until the charging is completed.

[0163] After the charging is completed according to the current adjustment method, the charging management unit updates the number of completed charging times, that is, updates the aging degree of the lithium battery.

[0164] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0165] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. A charging control method, comprising: Acquire a current impedance value of a set of impedance parameters of the battery, wherein the set of impedance parameters consists of at least one impedance parameter; Determining a current index in an electrochemical impedance spectroscopy data model according to the charge state information of the battery; According to the current impedance value, a comparison is made with a preset impedance parameter value corresponding to the current index, wherein the electrochemical impedance spectroscopy data model includes preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes; The charging current is determined based on the comparison result.

2. The charging control method according to claim 1, wherein: Comparing the current impedance value with a preset impedance parameter value corresponding to the current index includes: Determining a current impedance change value of the set of impedance parameters according to the current impedance value; The current impedance change value is compared with a preset impedance change value corresponding to the current index, wherein the electrochemical impedance spectroscopy data model includes an impedance change sub-data model, and the preset impedance parameter value in the impedance change sub-data model includes a preset impedance change value.

3. The charging control method according to claim 2, wherein: The charging current is determined based on the comparison result, including: When the current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds the preset impedance change value of the impedance parameter corresponding to the current index, reducing the charging current; or When the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is increased.

4. The charging control method according to claim 3, wherein: In a case where the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, increasing the charging current includes: When the charging current increases to a current peak value and the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is maintained at the current peak value.

5. The charging control method according to claim 2, wherein: The charging current is determined based on the comparison result, including: When charging is started, when the charging current is equal to the current peak value, and when the current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is reduced.

6. The charging control method according to claim 2, wherein: The charging current is determined based on the comparison result, including: When charging is started, when the charging current is less than the current peak value and when the current impedance change value of each impedance parameter in the set of impedance parameters does not exceed the preset impedance change value of the impedance parameter corresponding to the current index, the charging current is increased; or When charging is started, if the charging current is less than the current peak value and the current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds the preset impedance change value of the impedance parameter corresponding to the current index, charging is stopped.

7. The charging control method according to any one of claims 1 to 6, wherein: Comparing the current impedance value with a preset impedance parameter value corresponding to the current index includes: The current impedance value is compared with a preset impedance value corresponding to the current index, wherein the electrochemical impedance spectroscopy data model includes an impedance spectroscopy sub-data model, and the preset impedance parameter value in the impedance spectroscopy sub-data model includes a preset impedance value.

8. The charging control method according to claim 7, wherein: Comparing the current impedance value with a preset impedance value corresponding to the current index includes: Get the current ambient temperature of the battery; Determine a correction parameter corresponding to the current ambient temperature and the current index in a temperature-related sub-data model, wherein the electrochemical impedance spectroscopy data model includes the temperature-related sub-data model, and the temperature-related sub-data model includes correction parameters corresponding to different ambient temperatures and different indexes; Correcting the preset impedance value corresponding to the current index according to the current ambient temperature and the correction parameter corresponding to the current index; The current impedance value is compared with a preset impedance value corresponding to the corrected current index.

9. The charging control method according to claim 8, wherein: The charging current is determined based on the comparison result, including: When the current impedance value of each impedance parameter in the set of impedance parameters is less than the preset impedance value of the impedance parameter corresponding to the corrected current index, when charging is started, the charging current is made equal to the current peak value; or When the current impedance value of at least one impedance parameter in the set of impedance parameters is greater than the preset impedance value of the impedance parameter corresponding to the corrected current index, the charging current is made smaller than the current peak value when charging is started.

10. The charging control method according to any one of claims 1 to 6, wherein: After obtaining a current impedance value of a set of impedance parameters of the battery, the charging control method further includes: Comparing the current impedance value with a safe impedance value; When the current impedance value of at least one impedance parameter in the set of impedance parameters exceeds the safe impedance value corresponding to the impedance parameter, stopping charging; When the current impedance value of each impedance parameter in the set of impedance parameters does not exceed the safe impedance value corresponding to the impedance parameter, charging is started.

11. The charging control method according to any one of claims 1 to 6, wherein: The index in the electrochemical impedance spectroscopy data model includes at least one of battery voltage and charging times; Determining a current index according to the charging state information of the battery includes: At least one of a current battery voltage and a current charging number of the battery is determined to obtain the current index.

12. The charging control method according to claim 11, wherein: The index in the electrochemical impedance spectroscopy data model includes the number of charging times; the charging control method further includes: When charging is started, obtain the current charging times; or When charging is finished, the current charging times are updated.

13. The charging control method according to any one of claims 1 to 6, wherein: The impedance parameters constituting the set of impedance parameters include at least one of electrolyte impedance, membrane impedance, charge transfer impedance, and diffusion impedance.

14. The charging control method according to any one of claims 1 to 6, wherein: The charging control method further includes: The preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes are obtained, and the electrochemical impedance spectroscopy data model is established.

15. The charging control method according to claim 14, wherein: Obtaining preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes and establishing the electrochemical impedance spectroscopy data model includes: Obtaining preset impedance values ​​of the set of impedance parameters corresponding to different charging times and different battery voltages, and establishing an impedance spectrum data model; An impedance change sub-data model is established according to the impedance spectrum sub-data model, wherein the impedance change sub-data model includes preset impedance change values ​​of the group of impedance parameters corresponding to different charging times and different battery voltages.

16. The charging control method according to claim 15, wherein: Obtaining preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes and establishing the electrochemical impedance spectroscopy data model also includes: A temperature-related sub-data model is established according to the impedance spectrum sub-data model, wherein the temperature-related sub-data model includes correction parameters corresponding to different ambient temperatures and different battery voltages.

17. A terminal, comprising: one or more processors; A memory having one or more programs stored thereon, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the charging control method according to any one of claims 1 to 16.

18. A computer readable medium having a computer program stored thereon, wherein when the program is executed by a processor, the charging control method according to any one of claims 1 to 16 is implemented.

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