Charging control method, terminal, computer readable medium

Abstract

A charging control method comprises the steps: S1, obtaining current impedance values of a set of impedance parameters of a battery, wherein the set of impedance parameters comprises at least one impedance parameter; S2, determining a current index in an electrochemical impedance spectrum data model according to charging state information of the battery; S3, comparing the current impedance values with a preset impedance parameter value corresponding to the current index, wherein the electrochemical impedance spectrum data model comprises preset impedance parameter values of the set of impedance parameters corresponding to different indexes; and S4, determining a charging current according to a comparison result. According to the method, rapid charging can be implemented while the service life and safety of the battery are ensured. A terminal and a computer-readable medium are further included.

Description

Charging control method, terminal, and computer-readable medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to patent application No. 202310714508.7 filed with the China Patent Office on June 15, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to, but is not limited to, the field of charging technology. Background Art

[0004] Batteries are widely used in daily life, and fast charging technology is a key technology for improving the user experience. Fast charging primarily includes high-voltage fast charging and low-voltage, high-current fast charging. During fast charging, the current entering the battery increases, which in turn raises the battery temperature due to heat loss. Prolonged battery exposure to high temperatures accelerates aging, shortens battery life, and poses safety risks.

[0005] As fast-charging technology advances and the power of fast charging continues to increase, the lifespan and safety issues caused by the increased battery temperature caused by fast charging have become more prominent. How to achieve fast charging without affecting battery life and ensuring safety has become a key research topic in the industry.

[0006] Summary of the Invention

[0007] Embodiments of the present disclosure provide a charging control method, a terminal, and a computer-readable medium.

[0008] 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 spectroscopy 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 spectroscopy 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.

[0009] In a second aspect, an embodiment of the present disclosure provides a terminal comprising: one or more processors; and a memory storing one or more programs, 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 described in the first aspect of the embodiment of the present disclosure.

[0010] In a third aspect, an embodiment of the present disclosure provides a computer-readable medium having a computer program stored thereon. When the computer program is executed by a processor, the charging control method described in the first aspect of the embodiment of the present disclosure is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a flow chart of a charging control method according to an embodiment of the present disclosure;

[0012] FIG2 is a flow chart of some steps in another charging control method according to an embodiment of the present disclosure;

[0013] FIG3 is a flow chart of some steps in another charging control method according to an embodiment of the present disclosure;

[0014] FIG4 is a flow chart showing some steps in another charging control method according to an embodiment of the present disclosure;

[0015] FIG5 is a schematic diagram of an equivalent circuit of a battery in an embodiment of the present disclosure;

[0016] FIG6 is a schematic diagram of impedance of a battery according to an embodiment of the present disclosure;

[0017] FIG7 is a flow chart showing some steps in another charging control method according to an embodiment of the present disclosure;

[0018] FIG8 is a schematic diagram of the composition of a terminal in an embodiment of the present disclosure;

[0019] FIG9 is a schematic diagram of the composition of a computer-readable medium in an embodiment of the present disclosure;

[0020] FIG10 is a schematic diagram of a fast charging system architecture according to an embodiment of the present disclosure;

[0021] FIG11 is a schematic diagram of charging control in one embodiment;

[0022] FIG12 is a schematic diagram of charging control in another embodiment. DETAILED DESCRIPTION

[0023] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the charging control method, terminal, and computer-readable medium provided by the present disclosure are described in detail below with reference to the accompanying drawings.

[0024] Example embodiments will be described more fully hereinafter 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. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of this disclosure to those skilled in the art.

[0025] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0026] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] The terms used herein are used only 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.

[0028] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one 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 expressly defined as such herein.

[0029] The core of fast charging technology lies in increasing the charger's output power within the battery's supported charging curve, thereby increasing the battery's charging current and shortening the charging time. There are two ways for a charger to output high power: high output voltage and low voltage, high current.

[0030] High output voltage increases the charger's output power by increasing its output voltage. Given the same input current, the terminal's charging converter chip receives greater input power due to the higher input voltage, converting it into a higher output current. This, in turn, allows the battery to receive a higher charging current, shortening the charging time. During the charging process, the terminal's charging algorithm implementation control unit detects the status of the battery and the charging converter chip and notifies the charger to output an appropriate high voltage. This high voltage is then transmitted to the terminal's charging converter chip, which converts it into a voltage and corresponding current suitable for charging the battery.

[0031] Low-voltage, high-current charging increases the charger's output power by boosting its output current, allowing the battery to receive a higher charging current. This is primarily achieved through direct charging, where the charger directly charges the battery. During the fast-charging phase, the terminal's charging algorithm implementation control unit detects the battery status and instructs the charger to output the appropriate current and voltage to directly charge the battery.

[0032] During the charging process, the charging current adjustment process in the two methods described above is primarily based on the battery charging curve provided by the battery manufacturer and lacks monitoring of the battery's charging status. The chemical reactions of the electrolyte and active materials within the battery can undergo irreversible changes due to temperature. If the charging current exceeds the acceptable range, it will accelerate battery aging and shorten its lifespan. For example, lithium batteries have high energy density. Without proper monitoring of their status, if the internal impedance of the lithium battery exceeds a certain threshold, the heat generated by high current charging can pose a safety hazard.

[0033] Some battery application scenarios use multiple battery cells in series or in a series / parallel combination. 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. However, it is impossible to monitor the resistance of the electrolyte in the battery and the transfer resistance of ions. The safety hazard caused by internal heating of the battery due to excessive current during charging still exists.

[0034] In view of this, in a first aspect, referring to FIG1 , an embodiment of the present disclosure provides a charging control method, which may include:

[0035] 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;

[0036] S2. determining a current index in an electrochemical impedance spectroscopy data model according to the charge state information of the battery;

[0037] 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;

[0038] S4. Determine the charging current according to the comparison result.

[0039] The present disclosure does not impose any particular limitation on the impedance parameters that constitute a set of impedance parameters for a battery. For example, a set of impedance parameters may be composed of at least one of electrolyte impedance, diaphragm impedance, charge transfer impedance, diffusion impedance, and the like.

[0040] 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.

[0041] In the disclosed embodiments, an electrochemical impedance spectroscopy (EIS) data model is pre-established based on the impedance characteristics of the battery. Preset impedance parameter values ​​corresponding to a set of impedance parameters of the battery are defined within the EIS data model. During battery charging, the deviation of the current impedance values ​​of each impedance parameter from the preset impedance parameter values ​​within the EIS data model is monitored to reflect changes in the battery's internal state.

[0042] 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, etc.

[0043] In the embodiment of the present disclosure, the index is used to characterize the charge state of the battery, such as the number of charges, battery voltage, etc. In the embodiment of the present disclosure, 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 charge state. For example, using the number of charges + battery voltage as the index, the current number of charges is the 22nd and the battery voltage is 3.5V. The preset impedance parameter value corresponding to the number of charges of 22 times and the battery voltage of 3.5V is searched in the electrochemical impedance spectroscopy data model and compared.

[0044] In the disclosed embodiments, changes in the battery's internal state can be determined by comparing the current impedance value with a preset impedance parameter value in an electrochemical impedance spectroscopy data model. The charging current is then determined based on the comparison result, i.e., the charging current is adjusted based on the change in the battery's internal state. For example, if the comparison result indicates that the battery's internal state has deteriorated, the charging current is reduced; if the comparison result indicates that the battery's internal state has not deteriorated, the charging current is increased.

[0045] In the embodiment 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 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.

[0046] 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.

[0047] In some embodiments, the preset impedance parameter includes a preset impedance change value, where the preset impedance change value is a change in the electrochemical impedance of the battery when the battery is charged with a maximum current supported by the battery.

[0048] Accordingly, in some embodiments, referring to FIG. 2 , comparing the current impedance value with a preset impedance parameter value corresponding to the current index includes:

[0049] S311. Determine a current impedance change value of the set of impedance parameters according to the current impedance value;

[0050] 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.

[0051] The embodiment of the present disclosure does not impose any special limitation on the impedance change sub-data model. In some embodiments, the impedance change sub-data model is in the form shown in Table 1.

[0052] Table 1

[0053] 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 resistance, ΔZ w represents the change value of diffusion impedance; B represents the corresponding change value, for example, B 1y_3.3 Indicates recording Y, the change in electrolyte impedance when the battery voltage is 3.3V, B 2y_3.3 Indicates the change in the membrane impedance 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 Indicates the change in diffusion impedance when record Y and the battery voltage is 3.3V; record Y corresponds to the number of charges from N to X, indicating that the charge times from 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, and the degree of deterioration may be greater, when the battery is charged with the maximum current supported by the battery, the change in 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 in electrochemical impedance of the battery. When charging the battery, regardless of the size of the charging current, if the change in the electrochemical impedance of the battery exceeds this upper limit, it indicates that the internal state of the battery has deteriorated; if the change in 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.

[0054] Accordingly, in some embodiments, referring to FIG. 2 , determining the charging current according to the comparison result includes:

[0055] S411. When a current impedance change value of at least one impedance parameter in the set of impedance parameters exceeds a preset impedance change value of the impedance parameter corresponding to a current index, reducing the charging current;

[0056] S412: 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, increase the charging current.

[0057] In the embodiment 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, so the charging current can be increased, which is beneficial to shorten the charging time for fast charging.

[0058] In the embodiment of the present disclosure, 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.

[0059] 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.

[0060] 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.

[0061] 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:

[0062] 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.

[0063] In the disclosed embodiments, the peak current refers to the maximum current supported by this charge. In some embodiments, the maximum current supported by this charge is the smaller of the maximum current output by the terminal after the charging power provided by the charger is converted, or the maximum charging current allowed by the battery's charging curve.

[0064] In the embodiment of the present disclosure, the charging current at the start-up charging may be different depending on 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.

[0065] In some embodiments, charging is initiated at a current peak.

[0066] Accordingly, in some embodiments, determining the charging current according to the comparison result includes:

[0067] 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.

[0068] 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.

[0069] In some embodiments, charging is initiated with a low current.

[0070] Accordingly, in some embodiments, determining the charging current according to the comparison result includes:

[0071] When charging is started, if the charging current is less than 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 corresponding to the current index, increasing the charging current;

[0072] 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.

[0073] 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.

[0074] In the embodiment of the present disclosure, if the current impedance change value of any one or more impedance parameters exceeds the respective preset impedance change values ​​when charging is started with a low current, it indicates that the internal state of the battery has deteriorated, and stopping charging is beneficial to avoid safety risks.

[0075] In some embodiments, the preset impedance parameter includes a preset impedance value.

[0076] Accordingly, in some embodiments, comparing the current impedance value with a preset impedance parameter value corresponding to the current index may include:

[0077] 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 spectrum sub-data model, and the preset impedance parameter value in the impedance spectrum sub-data model includes a preset impedance value.

[0078] The embodiment of the present disclosure does not impose any special limitation on the impedance spectrum sub-data model. In some embodiments, the impedance spectrum sub-data model is in the form shown in Table 2.

[0079] Table 2

[0080] In Table 2, Rb represents the electrolyte impedance, Z sei Indicates the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents the diffusion impedance; A represents the corresponding impedance value, for example, A 1n_3.3 Indicates the value of electrolyte impedance when the battery voltage is 3.3V after the Nth charge, A 2n_3.3 Indicates the value of the diaphragm impedance when the battery voltage is 3.3V after the Nth charge, A 3n_3.3 Indicates the value of charge transfer impedance when the battery voltage is 3.3V after the Nth charge, A 4n_3.3 Indicates the diffusion impedance value when the battery voltage is 3.3V after the Nth charge.

[0081] In the disclosed embodiment, changes in the ambient temperature of the battery will affect the transfer of charge within the battery and the intercalation and deintercalation of ions in the electrode active material. Based on the impedance spectrum sub-data model, the adjustment ratio of the battery's electrochemical impedance with ambient temperature is determined, and then 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, referring to FIG. 3 , comparing the current impedance value with the preset impedance value corresponding to the current index includes:

[0083] S321. Obtain 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 embodiment of the present disclosure, the preset impedance parameter value is corrected using the 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 impose any special limitation on 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] In Table 2, Rb represents the electrolyte impedance, Z sei Indicates the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents the diffusion impedance; K represents the corresponding correction parameter, for example, K 1m_3.3 Indicates the correction parameter of electrolyte impedance when recording M and battery voltage is 3.3V, K 2m_3.3 Indicates the correction parameter of the membrane impedance when recording M, battery voltage 3.3V, K 3m_3.3 Indicates the correction parameter of charge transfer impedance when recording M, battery voltage 3.3V, K 4m_3.3 It represents the correction parameter of diffusion impedance when recording M and battery voltage is 3.3V.

[0091] The disclosed embodiments do not specifically limit how to modify the preset impedance value corresponding to the current index based on 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 at an ambient temperature of 25°C as an example, the preset impedance value is modified using the following formula:

[0092] 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.

[0093] In some embodiments, referring to FIG. 3 , determining the charging current according to the comparison result includes:

[0094] 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, set the charging current to be equal to the peak current value;

[0095] 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 starting charging, the charging current is set to be less than the current peak value.

[0096] In some embodiments, referring to FIG. 4 , after obtaining a current impedance value of a set of impedance parameters of the battery, the charging control method further includes:

[0097] S51, comparing the current impedance value with the safe impedance value;

[0098] S52: Stop charging if 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;

[0099] 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.

[0100] 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.

[0101] In the embodiment of the present disclosure, 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 conducive to reducing safety risks.

[0102] The embodiments of the present disclosure do not impose any special restrictions on the safety impedance. For example, the safety impedance is provided by the battery manufacturer or set based on experience.

[0103] The disclosed embodiment does not impose any special limitation on the index in the electrochemical impedance spectroscopy data model.

[0104] In some embodiments, the index in the electrochemical impedance spectroscopy data model includes at least one of battery voltage and charge times; and determining the current index according to the charge state information of the battery includes:

[0105] At least one of a current battery voltage and a current charging number of the battery is determined to obtain the current index.

[0106] For example, as shown in Table 2, the number of charging times + battery voltage is used as the index.

[0107] 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:

[0108] When charging is started, obtain the current charging times;

[0109] When charging is finished, the current charging times are updated.

[0110] In the embodiment of the present disclosure, updating the number of charge cycles means updating the degree of battery aging. Using the number of charge cycles 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 more accurately reflecting the internal state of the battery at the current ambient temperature, and facilitating more precise adjustment of the charging current.

[0111] The embodiment of the present disclosure does not impose any special limitation on the impedance parameters constituting a set of impedance parameters.

[0112] In some embodiments, the battery is equivalent to a circuit model as shown in FIG5. In FIG5, 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.

[0113] 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. The ratio of the detected voltage signal to the excitation current is the impedance value of the battery. In combination with the equivalent circuit of FIG5 , 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), Resei and C DL Impedance, Rct and C DL When the excitation signal is a low-frequency signal (for example, less than 1 Hz), the impedance of Rw is dominant. Figure 6 shows the corresponding 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 represented by the electrolyte impedance Rb, the diaphragm impedance Z sei , charge transfer impedance Z ct , diffusion impedance Z w .

[0114] Accordingly, in some embodiments, the impedance parameters constituting the set of impedance parameters include at least one of electrolyte impedance, membrane impedance, charge transfer impedance, and diffusion impedance.

[0115] In some embodiments, referring to FIG. 7 , the charging control method further includes:

[0116] S6. Obtain preset impedance parameter values ​​of the set of impedance parameters corresponding to different indexes, and establish the electrochemical impedance spectroscopy data model.

[0117] In some embodiments, establishing the electrochemical impedance spectroscopy data model comprises:

[0118] Obtaining preset impedance values ​​of the at least one set of impedance parameters corresponding to different charging times and different battery voltages, and establishing an impedance spectrum sub-data model;

[0119] An impedance change sub-data model is established based on the impedance spectrum sub-data model, wherein the impedance change sub-data model includes preset impedance change values ​​of the at least one impedance parameter corresponding to different charging times and different battery voltages.

[0120] In some embodiments, establishing the electrochemical impedance spectroscopy data model further comprises:

[0121] A temperature-related sub-data model is established based on 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.

[0122] 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.

[0123] In the second aspect, referring to Figure 8, an embodiment of the present disclosure provides a terminal, which includes: one or more processors 101; a memory 102, on which one or more programs are stored, and when the one or more programs are executed by 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; one or more I / O interfaces 103, connected between the processor and the memory, and configured to implement information interaction between the processor and the memory.

[0124] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, such as SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and 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), etc.

[0125] 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.

[0126] In a fourth aspect, referring to FIG9 , an embodiment of the present disclosure provides a computer-readable medium having a computer program stored thereon. When the computer program is executed by a processor, the charging control method described in the first aspect of the embodiment of the present disclosure is implemented.

[0127] 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 exemplary embodiments:

[0128] First Exemplary Embodiment

[0129] Figure 10 is a schematic diagram of the fast charging system architecture in this embodiment. In this embodiment, the fast charging system architecture comprises a charger and a terminal. The charger comprises a power management unit and a power conversion and output unit; the terminal comprises a power conversion unit, a charge management unit, an electrochemical impedance spectroscopy detection unit, and a temperature detection unit. The charger and terminal are connected via a charging cable consisting of a power line, a communication line, and a ground line.

[0130] Charger part: The power management unit is configured to communicate and identify with the terminal to be charged before charging, and control 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.

[0131] 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 configured to detect the electrochemical impedance spectrum of the battery; and the temperature detection unit is configured to detect the ambient temperature of the battery.

[0132] The power management unit of the charger is configured 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.

[0133] The terminal's charging management unit communicates with the charger to learn its power output capacity. The temperature detection unit detects the battery's ambient temperature, and controls the electrochemical impedance spectroscopy (EIS) detection unit to detect the battery's EIS, comparing it with a pre-established EIS model table (EIS data model). The charging current is adjusted accordingly based on the degree of deviation from the battery's EIS. The power conversion unit performs power conversion based on the received charging current parameters and the detected battery voltage parameters, input voltage, and current.

[0134] Electrochemical impedance spectroscopy (EIS) is a method used to measure internal battery parameters online. By applying a sinusoidal current of a certain frequency to the battery, a sinusoidal voltage signal is detected across the battery. The change in the ratio of the detected voltage signal to the excitation current is the battery's EIS.

[0135] The battery is equivalent to the circuit model shown in Figure 5. In Figure 5, 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. In combination with the equivalent circuit of Figure 5, when the excitation signal is a high-frequency signal (for example, more than 1KHz), it is mainly manifested as R b When the excitation signal is an intermediate frequency signal (for example, 1Hz to 1KHz), Resei and C DL Impedance, Rct and C DLWhen the excitation signal is a low-frequency signal (for example, less than 1 Hz), the impedance of Rw is dominant. Figure 6 shows the corresponding 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 represented by the electrolyte impedance Rb, the diaphragm impedance Z sei , charge transfer impedance Z ct , diffusion impedance Z w .

[0136] Second Exemplary Embodiment

[0137] In this embodiment, using a lithium battery as an example, before implementing the fast charging function on the lithium battery, the electrochemical impedance spectrum of the lithium battery is first modeled. Based on the impedance characteristics of the lithium battery, an impedance spectrum table (impedance spectrum sub-data model) corresponding to the lithium battery is established. The results are shown in Table 4, taking as an example the battery cut-off voltage of 4.35V and the discharge cut-off voltage of 3.3V in a natural environment with an initial temperature of 25°C.

[0138] Table 4

[0139] In Table 4, Rb represents the electrolyte impedance, Z sei Indicates the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents the diffusion impedance; A represents the corresponding impedance value, for example, A 1n_3.3 Indicates the value of electrolyte impedance when the battery voltage is 3.3V after the Nth charge, A 2n_3.3 Indicates the value of the diaphragm impedance when the battery voltage is 3.3V after the Nth charge, A 3n_3.3 Indicates the value of charge transfer impedance when the battery voltage is 3.3V after the Nth charge, A 4n_3.3 Indicates the diffusion impedance value when the battery voltage is 3.3V after the Nth charge.

[0140] The change in electrochemical impedance of lithium batteries also characterizes the aging process of lithium batteries. Irreversible electrochemical changes are the essence of lithium battery aging. When establishing the lithium battery impedance spectrum table (impedance spectrum sub-data model), the impedance change and current change table (impedance change sub-data model) are also established, as shown in Table 5. Combined with the records in Table 4, in a constant temperature environment of 25°C, at the same time, the maximum charging current Imax supported by the lithium battery is used for charging at each stage. The electrochemical impedance change of the lithium battery (for example, ΔRb = Rb x -Rb N >Rb 预设 ) exceeds the preset value, a corresponding record is generated.

[0141] Table 5

[0142] 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 resistance, ΔZ w represents the change value of diffusion impedance; B represents the corresponding change value, for example, B 1y_3.3 Indicates recording Y, the change in electrolyte impedance when the battery voltage is 3.3V, B 2y_3.3 Indicates the change in the membrane impedance 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 in diffusion impedance when record Y is at a battery voltage of 3.3V. Record Y corresponds to the number of charges from N to X, indicating that the number of charges from N to X corresponds to a record of electrochemical impedance change.

[0143] Temperature changes in the lithium battery's environment affect charge transfer and the intercalation and 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, correction parameters for the impedance corresponding to different temperatures throughout the aging process were determined, and a temperature-dependent sub-data model was established, as shown in Table 6.

[0144] Table 6

[0145] In Table 6, Rb represents the electrolyte impedance, Z sei Indicates the diaphragm impedance, Z ct represents the charge transfer impedance, Z w represents the diffusion impedance; K represents the corresponding correction parameter, for example, K 1m_3.3 Indicates the correction parameter of recording M, battery voltage 3.3V electrolyte impedance, K 2m_3.3 Indicates the recording M, battery voltage 3.3V, diaphragm impedance correction parameters, K 3m_3.3 Indicates the correction parameter of the charge transfer impedance of the record M, battery voltage 3.3V, K 4m_3.3 It represents the correction parameters of diffusion impedance when recording M and battery voltage is 3.3V.

[0146] Through Table 6, combined with the corresponding N-th charging process in Table 4, 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 N-th charging process.

[0147] Use the following formula to make corrections:

[0148] Among them, K mis 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.

[0149] Third Exemplary Embodiment

[0150] Figure 11 is a schematic diagram of the charging control process in this embodiment. After the charger is plugged in, the charging process begins. The terminal's charging management unit interacts with the charger to determine whether the plugged-in charger supports fast charging. If the interaction is successful, it indicates that the charger supports 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 defaults to a standard charger, for example, the charger output voltage 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 default to a standard charger in this case.

[0151] After determining the charger's power output capability, the charging management unit detects the lithium battery's voltage and the ambient temperature on the lithium battery's surface. Based on the battery voltage and number of charges, the impedance spectrum sub-data model shown in Table 4 can be used to obtain the lithium battery's electrochemical impedance spectrum, which consists of a set of preset impedance values ​​for impedance parameters, before charging begins. For example, if the lithium battery is currently charging for the 22nd time and the battery voltage is 3.5V, the current electrochemical impedance spectrum of the lithium battery can be obtained based on the impedance spectrum sub-data model shown in Table 4: 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 by thermistors on the lithium battery protection board. Combined with the impedance spectrum sub-data model shown in Table 4 and the temperature correlation 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 se i'=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 are performed (for example, not less than 3 times) 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 empirical values. 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.

[0152] 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 shown in Figure 12. If the current electrochemical impedance spectrum of the lithium battery Z T Lower 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 regularly 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 it is necessary to gradually reduce the charging current 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.

[0153] 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 electrochemical impedance change ΔZ of the lithium battery during low current charging. If the electrochemical impedance change 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 , then gradually increase the charging current and detect the change in the electrochemical impedance of the lithium battery until the change in the electrochemical impedance of the lithium battery ΔZ 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 converted 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 kept at the maximum charging current until the charging is completed.

[0154] After the charging is completed according to the above-mentioned current adjustment method, the charging management unit updates the number of completed charging times, that is, updates the aging degree of the lithium battery.

[0155] 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 it 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 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.

[0156] 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 is well 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 includes, but is 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 tape, 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 embodies 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.

[0157] 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 purposes of limitation. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly indicated, 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, it will be understood by those skilled in the art 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; The current impedance of at least one of the impedance parameters in the set of impedance parameters When the value exceeds the safety impedance value corresponding to the impedance parameter, charging is stopped; 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; and / 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; According to the impedance spectrum sub-data model, an impedance change sub-data model is established. The anti-variation sub-data model includes preset impedance variation 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 the computer program, when executed by a processor, implements the charging control method according to any one of claims 1 to 16.

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