Battery charging control method and device and storage medium

Abstract

The invention relates to a charging control method and device and a storage medium, and the method comprises the steps: determining the maximum available capacity and actual available capacity of a battery in response to the full charging of the battery during charging; determining the loss capacity of the battery based on the maximum available capacity and the actual available capacity; and performing charging control on the battery based on the loss capacity. According to the invention, dynamic charging of the aged battery is realized.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technology, and in particular to a battery charging control method, device and storage medium. Background Art

[0002] With the development of battery charging technology, fast and efficient battery charging solutions have been implemented.

[0003] In the related art, for example, the charging method of lithium-ion batteries can be charged by an optimized charging method to increase the available capacity of the battery. However, during the use of the battery, as the battery ages, the available capacity will decrease, which will further deteriorate the battery life and affect the user experience. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a battery charging control method, device and storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a charging control method, comprising: in response to a battery reaching full charge, determining a maximum available capacity and an actual available capacity of the battery; determining a loss capacity of the battery based on the maximum available capacity and the actual available capacity; and controlling charging of the battery based on the loss capacity.

[0006] In one embodiment, the charging control of the battery based on the lost capacity includes: in response to the lost capacity being greater than a capacity threshold, continuing to charge the battery according to the lost capacity; in response to the lost capacity being less than a capacity threshold, stopping charging the battery; the capacity threshold is determined based on an average discharge current of the battery and a predefined time.

[0007] In one embodiment, continuing to charge the battery according to the lost capacity includes: constant-current charging with a first current until a first voltage is reached, and constant-voltage charging with the first voltage until the charging capacity of the battery reaches the loss capacity; the first current is reduced according to a preset current compensation step based on at least one of the following: number of battery charge cycles; battery health.

[0008] In one implementation, the determining the maximum available capacity of the battery includes: determining the maximum available capacity of the battery based on an actual full charge capacity, a maximum capacity of the battery, and a storage capacity.

[0009] In one implementation, the maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity using the following formula:

[0010] Quse = Qfull*(100% - n%);

[0011] Wherein, Quse is the maximum available capacity of the battery, Qfull is the actual full charge capacity, and n% is the ratio of the storage capacity to the maximum capacity of the battery.

[0012] In one implementation, the actual available capacity is determined based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth; the charge cut-off depth is the charge cut-off discharge depth when the battery was last in a static state.

[0013] In one implementation, the actual available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth using the following formula:

[0014] Qcharge=Qfull*(100%-n%-DOD_EOC),

[0015] Wherein, Qcharge is the actual full charge capacity of the battery, Qfull is the actual full charge capacity, n% is the ratio of the storage capacity to the maximum capacity of the battery, and DOD_EOC is the charge cut-off depth.

[0016] In one implementation, the actual full charge capacity is determined in the following manner: a first discharge depth and a second discharge depth are collected when the battery enters a static state, the first discharge depth and the second discharge depth being different discharge depths; a difference between the first discharge depth and the second discharge depth, and a charge and discharge capacity of the battery are determined; and an absolute value of a ratio between the charge and discharge capacity and the difference is taken as the actual full charge capacity.

[0017] In one implementation, the first discharge depth and the second discharge depth are discharge depths collected in a non-platform voltage region.

[0018] According to a second aspect of an embodiment of the present disclosure, there is provided a charging control device, including:

[0019] A determination unit is used to determine the maximum available capacity and the actual available capacity of the battery in response to the battery reaching full charge; based on the maximum available capacity and the actual available capacity, determine the loss capacity of the battery; and a control unit is used to control the charging of the battery based on the loss capacity.

[0020] In one embodiment, the control unit controls the charging of the battery based on the lost capacity in the following manner: in response to the lost capacity being greater than a capacity threshold, the battery continues to be charged according to the lost capacity; in response to the lost capacity being less than a capacity threshold, the battery is stopped from being charged; the capacity threshold is determined based on an average discharge current of the battery and a predefined time.

[0021] In one embodiment, the control unit continues to charge the battery according to the lost capacity in the following manner: constant current charging with a first current until a first voltage is reached, and constant voltage charging with the first voltage until the charging capacity of the battery reaches the loss capacity; the first current is reduced according to a preset current compensation step based on at least one of the following: the number of battery charge cycles; the battery health.

[0022] In one implementation, the determination unit determines the maximum available capacity of the battery in the following manner: based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity, the maximum available capacity of the battery is determined.

[0023] In one implementation, the determination unit determines the maximum available capacity of the battery based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity using the following formula:

[0024] Quse = Qfull*(100% - n%);

[0025] Wherein, Quse is the maximum available capacity of the battery, Qfull is the actual full charge capacity, and n% is the ratio of the storage capacity to the maximum capacity of the battery.

[0026] In one embodiment, the actual available capacity is determined based on the actual full charge capacity Qfull, the maximum battery capacity Qmax, the storage capacity Qrs and the charge cut-off depth; the charge cut-off depth is the charge cut-off discharge depth when the battery was last in a static state.

[0027] In one implementation, the determination unit determines the actual available capacity of the battery based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth using the following formula:

[0028] Qcharge=Qfull*(100%-n%-DOD_EOC),

[0029] Wherein, Qcharge is the actual full charge capacity of the battery, Qfull is the actual full charge capacity, n% is the ratio of the storage capacity to the maximum capacity of the battery, and DOD_EOC is the charge cut-off depth.

[0030] In one implementation, the determination unit determines the actual full charge capacity as follows: collecting a first discharge depth and a second discharge depth when the battery enters a static state, the first discharge depth and the second discharge depth being different discharge depths; determining a difference between the first discharge depth and the second discharge depth, and a charge and discharge capacity of the battery; and taking an absolute value of a ratio between the charge and discharge capacity and the difference as the actual full charge capacity.

[0031] In one implementation, the first discharge depth and the second discharge depth are discharge depths collected in a non-platform voltage region.

[0032] According to a third aspect of an embodiment of the present disclosure, a terminal device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute the battery charging control method in the first aspect or any one of the embodiments of the first aspect without executing the executable instructions.

[0033] According to a fourth aspect of an embodiment of the present disclosure, a storage medium is provided, in which instructions are stored. When the instructions in the storage medium are executed by a processor of a terminal, the terminal is enabled to execute the battery charging control method in the first aspect or any one of the embodiments of the first aspect.

[0034] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the lost capacity of an aging battery is acquired in real time through the maximum available capacity and the actual available capacity of the battery, and the lost capacity is continuously replenished, so that the lost capacity of a battery of any degree of aging can be fully charged.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0037] Figure 1 The figure is a flow chart of a charging control method according to an exemplary embodiment.

[0038] Figure 2 The figure is a flow chart of a charging control method according to an exemplary embodiment.

[0039] Figure 3 The flowchart of continuing to charge a battery according to lost capacity is shown according to an exemplary embodiment.

[0040] Figure 4The invention is a flow chart showing a method for determining a maximum available capacity of a battery according to an exemplary embodiment.

[0041] Figure 5 The invention is a flow chart showing a method for determining an actual available capacity of a battery according to an exemplary embodiment.

[0042] Figure 6 The figure is a schematic diagram showing a current charging method of a mobile phone lithium-ion battery according to an exemplary embodiment.

[0043] Figure 7 The figure is a schematic diagram showing the open circuit voltage and capacity of a battery according to an exemplary embodiment.

[0044] Figure 8 is a schematic diagram of an open circuit voltage curve according to an exemplary embodiment.

[0045] Fig. 9 The figure is a schematic diagram showing the charging, discharging and static states of a battery according to an exemplary embodiment.

[0046] Fig.10 The figure is a schematic diagram of supplementing lost capacity according to an exemplary embodiment.

[0047] Fig.11 The invention is a block diagram of a charging control device according to an exemplary embodiment.

[0048] Fig.12 The figure is a block diagram of a device for charging control according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure.

[0050] The battery charging method provided in the embodiments of the present disclosure is applied to battery charging and battery power calculation scenarios. The battery charging method involved in the embodiments of the present disclosure is mainly applied to the scenario of charging control of lithium-ion batteries. For example, it is applied to the scenario of charging an aged lithium-ion battery.

[0051] In the battery charging method in the related art, when the battery of the terminal device is fully charged, the charging is cut off according to the battery information such as the full charge cut-off voltage and the full charge cut-off current. During the battery charging process, a multi-stage constant current and constant voltage charging method is adopted. The condition for full charging in this method is to first charge with a constant current to the full charge voltage Vfull and then charge with a full charge voltage and constant voltage to the full charge current Ifull. However, since the full charge cut-off voltage and the full charge cut-off current are pre-set values, the loss capacity of the battery after aging cannot reach the actual full charge capacity, which leads to a decrease in the actual available capacity Qcharge of the aged battery.

[0052] Moreover, for aged batteries, the actual full charge capacity Qfull of the battery naturally decreases. As a result, the actual available capacity Qcharge of the aged battery will also decrease. In order to ensure that the lost capacity Qloss of the aged battery can reach full charge, the lost capacity Qloss of the aged battery needs to be charged. However, when charging the aged battery, in order to prevent the battery from being overcharged, the actual available capacity Qcharge of the aged battery after charging is also reduced.

[0053] In view of this, the present disclosure provides a battery charging control method, which replenishes the lost capacity Qloss of an aging battery in real time, and charges the battery while ensuring that the lost capacity Qloss of the aging battery is fully charged without overcharging the battery.

[0054] In the embodiment of the present disclosure, charging control is performed based on the maximum available capacity Quse and the actual available capacity Qcharge of the battery.

[0055] The implementation process of the battery charging control method in the embodiment of the present disclosure is described below.

[0056] Figure 1 FIG. 1 is a flow chart of a battery charging control method according to an exemplary embodiment. Figure 1 As shown, the battery charging control method is used in a terminal and includes the following steps.

[0057] In step S11 , in response to the battery being fully charged, the maximum available capacity and the actual available capacity of the battery are determined.

[0058] In the disclosed embodiment, the battery is fully charged according to a multi-stage constant current and constant voltage charging method.

[0059] The maximum available capacity of the battery involved in the embodiments of the present disclosure can be understood as the maximum capacity that the terminal device can use after the battery reaches a fully charged state. The actual available capacity of the battery can be understood as the actual capacity that the terminal device can use after the battery reaches an actual fully charged state.

[0060] In step S12, the lost capacity of the battery is determined based on the maximum available capacity and the actual available capacity.

[0061] In the embodiment of the present disclosure, the loss capacity of the battery is determined according to the difference between the maximum available capacity and the actual available capacity.

[0062] The lost capacity of the battery involved in the embodiments of the present disclosure may be understood as the capacity of the battery that cannot be used by the terminal due to aging and is based on the maximum available capacity.

[0063] In step S13, the battery charging is controlled based on the lost capacity.

[0064] In the disclosed embodiment, based on the lost capacity, the lost capacity of the aged battery is supplemented and the charging of the battery is controlled.

[0065] Among them, the charging control involved in the embodiment of the present disclosure can be understood as replenishing the lost capacity of the aging battery and continuously obtaining the lost capacity of the battery until the lost capacity of the battery is replenished to a fully charged state.

[0066] In the disclosed embodiment, the real-time capacity loss of the aged battery is obtained and the real-time capacity loss of the aged battery is continuously and dynamically replenished, so that batteries of any degree of aging can be guaranteed to be fully charged.

[0067] Embodiments of the Disclosure The following describes a charging control method according to an embodiment of the disclosure.

[0068] In the disclosed embodiment, the charging control of the aged lithium-ion battery includes determining the capacity information of the battery at each stage based on the capacity information of the battery during the charging control process, that is, determining the maximum available capacity information and the actual available capacity information in the fully charged state to realize the charging control of the battery loss capacity.

[0069] The battery capacity information involved in the present disclosure includes but is not limited to the following: the actual full charge capacity of the battery when fully charged, the maximum capacity of the battery, the storage capacity, the maximum available capacity of the battery, and the actual available capacity of the battery.

[0070] Figure 2 FIG. 1 is a flow chart of a charging control method according to an exemplary embodiment. Figure 2 As shown, the following steps are included:

[0071] In step S21 , the loss capacity and the capacity threshold are determined.

[0072] In the embodiment of the present disclosure, the capacity threshold is the product of the average discharge current and the predefined time. The average discharge current is the average discharge current of the terminal device. The product of the predefined time is a value that will cause the user to noticeably perceive a short battery life when using the whole device.

[0073] In step S22, in response to the loss capacity being greater than the capacity threshold, the battery continues to be charged according to the loss capacity.

[0074] In the disclosed embodiment, the lost capacity is greater than the capacity threshold, indicating that the battery has reached the target value of capacity loss, that is, the condition for dynamically replenishing the lost capacity is met, so the battery continues to be charged according to the lost capacity.

[0075] In step S23, in response to the loss capacity being less than the capacity threshold, charging of the battery is stopped.

[0076] In the disclosed embodiment, the loss capacity is less than the capacity threshold, indicating that the battery has not reached the target value of capacity loss, that is, the battery has not aged in the current state and can meet the charging capacity requirement in the current state, so charging of the battery is stopped.

[0077] In the disclosed embodiment, the loss capacity obtained by the terminal device is the loss capacity obtained by the aged battery in the fully charged state. When the loss capacity of the aged battery is less than the capacity threshold, it means that the battery has not reached the actual aged state, and the battery is stopped from being charged. The disclosed embodiment determines whether the battery has reached an aged state in a practical sense based on the loss capacity of the battery. If the loss capacity of the battery has not reached the loss capacity in the aged state in a practical sense in the fully charged state, the battery is stopped from being charged. If the loss capacity of the battery reaches or exceeds the loss capacity in the aged state in a practical sense in the fully charged state, the battery is continued to be charged. The charging capacity of the aged battery is explicitly guaranteed, so that the loss capacity of the aged battery can reach full charge without overcharging the capacity of the aged battery.

[0078] In the embodiment of the present disclosure, in order to achieve real-time replenishment of the lost capacity of the battery, a multi-stage constant current and constant voltage charging method is adopted to compensate for the lost capacity of the battery.

[0079] Figure 3 FIG. 1 is a flow chart showing how to continue charging a battery according to the lost capacity according to an exemplary embodiment. Figure 3 As shown, the following steps are included:

[0080] In step S31 , a first current is determined.

[0081] In the embodiment of the present disclosure, the first current is the current of the battery when it reaches a fully charged state and is discharged to eliminate electrochemical polarization. The current is reduced according to a preset current compensation step based on at least one of the following: the number of battery cycle charging times; the battery health.

[0082] The current compensation step is determined based on the ratio of the actual full charge capacity of the battery to the maximum capacity of the battery. It can be expressed as: Iw = Iw_new (1 + 1 - Qfull / Qmax). Iw is the first current required for charging when the battery compensates for the lost capacity, Iw_new is the first current required for charging in the previous cycle, and Qfull / Qmax is the ratio of the actual full charge capacity of the battery measured in the battery charging cycle to the maximum capacity of the battery.

[0083] In step S32, constant current charging is performed with a first current until a first voltage is reached, and constant voltage charging is performed with a first voltage until the charging capacity of the battery reaches the loss capacity.

[0084] In the embodiment of the present disclosure, the first voltage is the full charge voltage reached during the charging process.

[0085] In the disclosed embodiment, the battery is charged with a first constant current to a first voltage, and then charged with a first constant voltage until the charging capacity of the battery reaches the loss capacity.

[0086] In the embodiment of the present disclosure, the loss capacity of the battery that needs to be compensated can be accurately controlled according to the multi-stage constant current and constant voltage charging method.

[0087] Figure 4 FIG. 1 is a flow chart showing a method of determining the maximum available capacity of a battery according to an exemplary embodiment. Figure 4 As shown, the following steps are included:

[0088] In step S41, the actual full charge capacity, the maximum battery capacity and the storage capacity are determined.

[0089] In the disclosed embodiment, the storage capacity is the capacity when the terminal device is shut down in a normal state. For example, the shutdown voltage of the terminal device is usually greater than 3.0V. It is usually set to 3.4V, so the capacity between 3.0V and 3.4V is the storage capacity, which will not change with the aging of the battery. Therefore, the ratio between the storage capacity and the maximum capacity of the battery is usually set to a fixed value n%, which is about 2%.

[0090] In step S42, the maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity.

[0091] In the embodiments of the present disclosure, for example, the maximum available capacity of the battery may be determined by a calculation formula.

[0092] In one embodiment, the maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity using the following formula:

[0093] Quse = Qfull*(100% - n%);

[0094] Wherein, Quse is the maximum available capacity of the battery, Qfull is the actual full charge capacity, and n% is the ratio of the storage capacity to the maximum capacity of the battery.

[0095] In the disclosed embodiment, the maximum available capacity of the battery is more rigorously expressed according to the determined formula, thereby ensuring the accuracy of the maximum available capacity value of the battery.

[0096] Figure 5 FIG. 1 is a flow chart showing a method of determining the actual available capacity of a battery according to an exemplary embodiment. Figure 5 As shown, the following steps are included:

[0097] In step S51, the actual full charge capacity, the maximum battery capacity, the storage capacity and the charge cut-off depth are determined.

[0098] In the embodiment of the present disclosure, the charge cut-off depth is a discharge depth closest to the end of charging obtained by the power calculation chip through Coulomb integration and when the battery enters a static state.

[0099] In step S52, the actual available capacity is determined based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth.

[0100] In the embodiments of the present disclosure, for example, the actual available capacity of the battery may be determined by a calculation formula.

[0101] In one embodiment, the actual available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth using the following formula:

[0102] Qcharge=Qfull*(100%-n%-DOD_EOC),

[0103] Among them, Qcharge is the actual available capacity of the battery, Qfull is the actual full charge capacity, n% is the ratio of storage capacity to the maximum capacity of the battery, and DOD_EOC is the charge cut-off depth.

[0104] In the disclosed embodiment, the actual available capacity of the battery is more rigorously expressed according to the determined formula, thereby ensuring the accuracy of the actual available capacity value of the battery.

[0105] In one embodiment, the actual full charge capacity is determined in the following manner: when the battery enters a static state, a first discharge depth and a second discharge depth are collected, wherein the first discharge depth and the second discharge depth are different discharge depths; the difference between the first discharge depth and the second discharge depth, and the charge and discharge capacity of the battery are determined; and the absolute value of the ratio between the charge and discharge capacity and the difference is used as the actual full charge capacity.

[0106] In one embodiment, the static state is when the power calculation chip detects that the charge and discharge current of the battery is between (-Ir, Ir), where Ir is the battery standby current, and the battery voltage change value ΔV<5uV / s, the battery is considered to enter the static state.

[0107] In one embodiment, for example, the actual full charge capacity is determined using the following formula:

[0108] Qfull=|Qpass / (DODa-DODb)|

[0109] Wherein, DODa is the first discharge depth of the battery, DODb is the second discharge depth of the battery, Qfull is the actual full charge capacity, and Qpass is the charge and discharge capacity of the battery between the first discharge depth and the second discharge depth.

[0110] In the embodiment of the present disclosure, the first discharge depth and the second discharge depth are discharge depths collected in a non-platform voltage region.

[0111] Figure 6 FIG. 1 is a schematic diagram showing a current charging method of a mobile phone lithium-ion battery according to an exemplary embodiment. Figure 6 As shown, the horizontal axis is time t and the vertical axis is voltage V.

[0112] In the figure, the battery is charged with a constant current of charging current I, and then charged with a constant voltage of battery voltage V, and this is repeated many times until the battery reaches a full charge voltage Vfull and a full charge current Ifull during constant voltage charging. 3.4v in the left vertical axis is the shutdown voltage of the battery under normal conditions, and 3.0v is the shutdown voltage under ideal conditions.

[0113] Figure 7 FIG. 1 is a schematic diagram showing a battery open circuit voltage and capacity according to an exemplary embodiment. Figure 7 As shown, the horizontal axis is the capacity Q and the vertical axis is the battery voltage V.

[0114] Among them, Vfull is the full charge voltage, 3.4v is the shutdown voltage of the battery in normal state, 3.0v is the shutdown voltage in ideal state, DOD0 is the discharge depth collected when the battery is about to reach the full charge voltage, DOD1 is a discharge depth collected by the battery, DOD2 is another discharge depth collected by the battery different from DOD1, DOD3 is another discharge depth collected by the battery different from DOD1 and DOD2, ΔV=I*Ra, I is the discharge current of the battery, Ra is the internal resistance of the battery, ΔV is the voltage change value of the battery, OCV (Open circuit voltage) is an inherent characteristic of the battery and will not change with the aging of the battery. At the same depth of discharge (DOD), the OCV value is also fixed. Qmax is the capacity of the battery when it is discharged to 3.0V after being fully charged. This capacity is the maximum capacity of the battery, and Qmax will gradually decrease with aging. Qcharge is the actual available capacity of the whole machine. Since the shutdown voltage of the whole machine is usually greater than 3.0V, for example, it is often set to 3.4V, so the capacity between 3.4V and 3.0V is the storage capacity Qrs. Because research shows that OCV (DOD) is an inherent characteristic of the battery, no matter how the battery ages, Qrs / Qmax is also a fixed value of n%, about 2%; Qloss is the loss capacity caused by not fully charging.

[0115] In an exemplary embodiment of the present disclosure, lithium batteries will inevitably age during use, and the internal resistance Ra of the aged battery will gradually increase. When charging, Vfull = OCV + I*Ra. Therefore, when Ra increases and the full charge current Ifull remains unchanged, the OCV corresponding to the full charge voltage Vfull will also decrease. Figure 7 It can be found that the larger the Ra is after the battery is fully charged, the greater the lost capacity Qloss will be. This means that under the current charging method, after aging, not only will Qmax naturally decrease, resulting in a smaller available capacity Qcharge, but the loss capacity Qloss will also increase, which will also cause the available capacity Qcharge to decrease, thereby exacerbating the user's battery life.

[0116] Figure 8 FIG. 1 is a schematic diagram of an open circuit voltage curve according to an exemplary embodiment. Figure 8 As shown, the horizontal axis is the capacity Q of the battery, and the vertical axis is the voltage V of the battery.

[0117] Among them, the platform voltage area is the area where the battery voltage refers to the open circuit voltage curve, and there is an area where the slope does not change significantly. Vpack1 is the voltage measured by the battery at the first discharge depth, and Vpack2 is the voltage measured by the battery at the second discharge depth. Vfull is the full charge voltage, 3.4v is the shutdown voltage of the battery in normal state, 3.0v is the shutdown voltage under ideal state, DODa is the first discharge depth of the battery, DODb is the second discharge depth of the battery, OCV curve is the fitted open circuit voltage curve, ΔQ is the discharge capacity between the first discharge depth and the second discharge depth, and Qfull is the actual full charge capacity.

[0118] Fig. 9 FIG. 1 is a schematic diagram showing a battery charging, discharging and resting state according to an exemplary embodiment. Fig. 9 As shown, the abscissa is time t, the left ordinate is voltage V, and the right ordinate is current I.

[0119] In an exemplary embodiment of the present disclosure, the battery is first charged with a constant current with a charging current I. When the power calculation chip detects that the charge and discharge current of the battery is between (-Ir, Ir) and the battery voltage change value ΔV<5uV / s, the battery voltage is the static voltage v at this time, that is, the battery is considered to be in a static state. The voltage detected after entering the static state is considered to be the OCV voltage of the battery, that is, the open circuit voltage of the battery. The power calculation chip will collect two DOD points: DODa and DODb, and calculate the charge and discharge capacity Qpass between DODa and DODb through Coulomb integration. The battery will then be deactivated and then continue to be charged with a constant current I until the battery reaches a full charge voltage Vfull.

[0120] The battery charge and discharge current Ir is the standby current of the battery.

[0121] Fig.10 FIG. 1 is a schematic diagram showing a method of supplementing lost capacity according to an exemplary embodiment. Fig.10 As shown, the horizontal axis is time t, the left vertical axis is voltage V, and the right vertical axis is current I.

[0122] In the figure, the battery is charged with a constant current at a charging current I, and then charged with a constant voltage at a battery voltage V. When the battery is charged to a full charge state at a constant current and a constant voltage, the battery is turned on for rapid passivation. The battery after rapid passivation is subjected to capacity tracking Qloss. The 3.4v in the left vertical axis is the shutdown voltage of the battery in a normal state, and 3.0v is the shutdown voltage in an ideal state.

[0123] In an exemplary embodiment of the present disclosure, based on the problem that the aged battery cannot be fully charged, the lost capacity of the aged battery is compensated.

[0124] The actual full charge capacity of the battery Qfull is calculated, Qfull = |Qpass / (DODa-DODb)|. In order to prevent inaccurate calculation of Qfull, the DODa and DODb points are not updated in the platform voltage area.

[0125] In an exemplary embodiment of the present disclosure, after obtaining the actual full charge capacity Qfull, the system can calculate the maximum available capacity Quse of the battery in the whole machine at the current stage, that is, Quse=Qloss+Qcharge=Qfull*(100%-n%).

[0126] Wherein, n% is the ratio between the storage capacity Qrs and the maximum capacity Qmax of the battery, which is generally set to a fixed value of about 2%.

[0127] In an exemplary embodiment of the present disclosure, a charging cut-off DOD measurement strategy is added to the power calculation chip: during charging, the power calculation chip can calculate the real-time DOD during the charging process through Coulomb integration and a DOD point (such as DODa) obtained at a static state closest to the current charging. When the charging is cut off (EOC: End of charge), the DOD_EOC after the cut-off can be calculated, and then Qcharge=Qfull*(100%-n%-DOD_EOC) can be calculated. Calculating Qcharge through the DOD difference can eliminate the capacity integration error caused by long-term Coulomb integration, making the Qcharge calculation more accurate. The loss capacity in the current stage is Qloss=Quse-Qcharge.

[0128] In an exemplary embodiment of the present disclosure, in order to prevent overcharging caused by errors such as loss capacity Qloss calculation, a start condition of the capacity tracking strategy is set, that is, it is started when Qloss>Qstart.

[0129] Among them, Qstar is usually a value that will cause the user to obviously perceive the battery life to be short when using the whole machine. Qstart = Tuse*Idis, Tuse is the time value of the battery life difference that can be perceived by the user, and Idis is the average discharge current of the whole machine.

[0130] In an exemplary embodiment of the present disclosure, if the system determines that Qloss>Qstart, the entire machine starts the accelerated deactivation function after charging in the current manner, that is, discharges with a small current Iw to quickly eliminate the electrochemical polarization just after charging is completed, so that the battery voltage Vpack is close to the OCV value.

[0131] Among them, Iw is the first current required for charging when the battery compensates for the lost capacity. Iw gradually increases as the battery ages. Iw=Iw_new(1+1-Qfull / Qfresh), Iw_new is the first current required for charging in the previous cycle, Qfull / Qmax is the ratio of the actual full charge capacity of the battery measured in the battery charging cycle to the maximum capacity of the battery. Since the passive discharge capacity is very small, this part of the capacity can be ignored.

[0132] In an exemplary embodiment of the present disclosure, after the polarization of the battery is eliminated, the system charges with a constant current Im to Vfull, and then charges with a constant voltage Vfull. During the entire charging process, the system calculates the charging capacity in real time, and stops charging when the charging capacity is equal to Qloss.

[0133] Among them, when the battery is nearly fully charged, Im can be set to a smaller value. However, in order to avoid long charging time, Im cannot be designed to be too small. If Im is set too large, there is a risk of lithium deposition caused by overcurrent. Therefore, Im is set to decrease step by step with the number of battery cycles or the battery health state (SOH). For example, the power calculation chip calculates that Im will decrease by 10% for every 100 additional cycles of the battery, or Im will decrease by 10% for every 5% decrease in Qfull / Qfresh.

[0134] In one embodiment, the real-time loss capacity of the aged battery is obtained based on the actual available capacity of the battery's maximum available capacity, and the battery that has been charged in the current manner is turned on to accelerate the elimination of electrochemical polarization. The battery that has eliminated electrochemical polarization is charged to a first voltage by the system at a first constant current until the loss capacity of the battery reaches full charge. By tracking the loss capacity of the battery in real time and performing dynamic charging, batteries of any degree of aging can be guaranteed to be fully charged without overcharging, thereby improving the user experience.

[0135] Based on the same concept, an embodiment of the present disclosure also provides a charging control device.

[0136] It is understandable that in order to realize the above functions, the charging control device provided in the embodiment of the present disclosure includes hardware structures and / or software modules corresponding to the execution of each function. In combination with the units and algorithm steps of each example disclosed in the embodiment of the present disclosure, the embodiment of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the technical solution of the embodiment of the present disclosure.

[0137] Fig.11is a block diagram of a device for battery charging control according to an exemplary embodiment. Fig.11 The device 100 includes a determination unit 101 and a control unit 102. The determination unit 101 is used to determine the maximum available capacity and the actual available capacity of the battery in response to the battery being fully charged; based on the maximum available capacity and the actual available capacity, determine the loss capacity of the battery;

[0138] The control unit 102 is used to control charging of the battery based on the lost capacity.

[0139] In one implementation, the determination unit 101 is used to determine the maximum available capacity and the actual available capacity of the battery when the battery is fully charged, and determine the lost capacity of the battery based on the maximum available capacity and the actual available capacity.

[0140] In one embodiment, the determination unit 101 determines the maximum available capacity and the actual available capacity of the battery in the following manner: the maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity; the actual available capacity is determined based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charging cut-off depth.

[0141] In one implementation, the determination unit 101 determines the actual full charge capacity of the battery in the following manner: collecting a first discharge depth and a second discharge depth when the battery enters a static state, wherein the first discharge depth and the second battery discharge depth are different discharge depths; determining the difference between the first discharge depth and the second discharge depth, and the charge and discharge capacity of the battery; and taking the absolute value of the ratio between the charge and discharge capacity and the difference as the actual full charge capacity.

[0142] In one implementation, the determination unit 101 determines the lost capacity of the battery in the following manner: the lost capacity of the battery is determined according to the difference between the maximum available capacity of the battery and the actual available capacity of the battery.

[0143] In one embodiment, the control unit 102 controls the charging of the battery in the following manner: controlling the charging of the battery according to the lost capacity of the battery. Rapidly eliminating electrochemical polarization of the battery according to the battery lost capacity being greater than a capacity threshold. The battery after rapid elimination of electrochemical polarization is charged at a constant current according to a first current until a first voltage is reached, and is charged at a constant voltage according to a first voltage until the charging capacity of the battery reaches the lost capacity.

[0144] In one embodiment, the control unit 102 quickly eliminates electrochemical polarization of the battery in the following manner: quickly eliminates electrochemical polarization after charging by discharging with a first current, so that the voltage value of the battery is close to the open circuit voltage value.

[0145] In one implementation, the control unit 102 controls the first current of the battery in the following manner: the discharge current of the battery is reduced according to a preset current compensation step based on at least one of the following: the number of battery charge cycles; the battery health.

[0146] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0147] Fig.12 is a block diagram of a device 200 for charging control according to an exemplary embodiment. The device 200 may be provided as a terminal. For example, the device 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0148] Reference Fig.12 , the device 200 may include one or more of the following components: a processing component 202 , a memory 204 , a power component 206 , a multimedia component 208 , an audio component 210 , an input / output (I / O) interface 212 , a sensor component 214 , and a communication component 216 .

[0149] The processing component 202 generally controls the overall operation of the device 200, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 202 may include one or more processors 220 to execute instructions to perform all or part of the steps of the above-described method. In addition, the processing component 202 may include one or more modules to facilitate interaction between the processing component 202 and other components. For example, the processing component 202 may include a multimedia module to facilitate interaction between the multimedia component 208 and the processing component 202.

[0150] The memory 204 is configured to store various types of data to support operations on the device 200. Examples of such data include instructions for any application or method operating on the device 200, contact data, phone book data, messages, pictures, videos, etc. The memory 204 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0151] The power component 206 provides power to the various components of the device 200. The power component 206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 200.

[0152] The multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 208 includes a front camera and / or a rear camera. When the device 200 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0153] The audio component 210 is configured to output and / or input audio signals. For example, the audio component 210 includes a microphone (MIC), and when the device 200 is in an operation mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 204 or sent via the communication component 216. In some embodiments, the audio component 210 also includes a speaker for outputting audio signals.

[0154] I / O interface 212 provides an interface between processing component 202 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0155] The sensor assembly 214 includes one or more sensors for providing various aspects of the status assessment of the device 200. For example, the sensor assembly 214 can detect the open / closed state of the device 200, the relative positioning of components, such as the display and keypad of the device 200, the sensor assembly 214 can also detect the position change of the device 200 or a component of the device 200, the presence or absence of user contact with the device 200, the orientation or acceleration / deceleration of the device 200 and the temperature change of the device 200. The sensor assembly 214 can include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 214 can also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 214 can also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.

[0156] The communication component 216 is configured to facilitate wired or wireless communication between the device 200 and other devices. The device 200 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 216 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 216 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0157] In an exemplary embodiment, the apparatus 200 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above method.

[0158] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 204 including instructions, and the instructions can be executed by the processor 220 of the device 200 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0159] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0160] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0161] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0162] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

[0163] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0164] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modifications, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure.

[0165] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A charging control method, characterized in that: The method comprises: In response to the battery reaching full charge, determining a maximum available capacity and an actual available capacity of the battery; Determining a lost capacity of the battery based on the maximum available capacity and the actual available capacity; Based on the lost capacity, charging of the battery is controlled.

2. The method according to claim 1, characterized in that The controlling the charging of the battery based on the lost capacity includes: In response to the loss capacity being greater than a capacity threshold, continuing to charge the battery according to the loss capacity; In response to the loss capacity being less than a capacity threshold, stopping charging the battery; The capacity threshold is determined based on an average discharge current of the battery and a predefined time.

3. The method according to claim 2, characterized in that The continuing to charge the battery according to the lost capacity includes: Performing constant current charging with a first current until a first voltage is reached, and performing constant voltage charging with the first voltage until the charging capacity of the battery reaches the loss capacity; The first current is reduced according to a preset current compensation step based on at least one of the following: Number of battery charge cycles; Battery health.

4. The method according to claim 1, characterized in that: The determining the maximum available capacity of the battery comprises: The maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity.

5. The method according to claim 4, characterized in that The maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum battery capacity, and the storage capacity using the following formula: Quse = Qfull*(100% - n%); Wherein, Quse is the maximum available capacity of the battery, Qfull is the actual full charge capacity, and n% is the ratio of the storage capacity to the maximum capacity of the battery.

6. The method according to claim 1, characterized in that The actual available capacity is determined based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity and the charge cut-off depth; The charge cut-off depth is the charge cut-off discharge depth when the battery was in a static state most recently.

7. The method according to claim 6, characterized in that The actual available capacity of the battery is determined using the following formula based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth: Qcharge=Qfull*(100%-n%-DOD_EOC), Wherein, Qcharge is the actual available capacity of the battery, Qfull is the actual full charge capacity, n% is the ratio of the storage capacity to the maximum capacity of the battery, and DOD_EOC is the charge cut-off depth.

8. The method according to claim 4 or 6, characterized in that: The actual full charge capacity is determined in the following manner: When the battery enters a static state, collecting a first discharge depth and a second discharge depth, wherein the first discharge depth and the second discharge depth are different discharge depths; determining a difference between the first depth of discharge and the second depth of discharge, and a charge and discharge capacity of the battery; The absolute value of the ratio between the charge-discharge capacity and the difference is taken as the actual full charge capacity.

9. The method according to claim 8, characterized in that The first discharge depth and the second discharge depth are discharge depths collected in a non-platform voltage region.

10. A charging control device, characterized in that: include: a determining unit, configured to determine a maximum available capacity and an actual available capacity of the battery in response to the battery being fully charged; Determining a lost capacity of the battery based on the maximum available capacity and the actual available capacity; A control unit is used to control charging of the battery based on the lost capacity.

11. The charging control device according to claim 10, characterized in that: The control unit controls charging of the battery based on the lost capacity in the following manner: In response to the loss capacity being greater than a capacity threshold, continuing to charge the battery according to the loss capacity; In response to the loss capacity being less than a capacity threshold, stopping charging the battery; The capacity threshold is determined based on an average discharge current of the battery and a predefined time.

12. The charging control device according to claim 11, characterized in that: The control unit continues to charge the battery according to the lost capacity in the following manner: Performing constant current charging with a first current until a first voltage is reached, and performing constant voltage charging with the first voltage until the charging capacity of the battery reaches the loss capacity; The first current is reduced according to a preset current compensation step based on at least one of the following: Number of battery charge cycles; Battery health.

13. The charging control device according to claim 10, characterized in that: The determining unit determines the maximum available capacity of the battery in the following manner: The maximum available capacity of the battery is determined based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity.

14. The charging control device according to claim 13, characterized in that: The determining unit determines the maximum available capacity of the battery based on the actual full charge capacity, the maximum capacity of the battery, and the storage capacity using the following formula: Quse = Qfull*(100% - n%); Wherein, Quse is the maximum available capacity of the battery, Qfull is the actual full charge capacity, and n% is the ratio of the storage capacity to the maximum capacity of the battery.

15. The charging control device according to claim 10, characterized in that: The actual available capacity is determined based on the actual full charge capacity, the maximum battery capacity Qmax, the storage capacity Qrs and the charge cut-off depth; The charge cut-off depth is the charge cut-off discharge depth when the battery was in a static state most recently.

16. The charging control device according to claim 15, characterized in that: The determination unit determines the actual available capacity of the battery based on the actual full charge capacity, the maximum capacity of the battery, the storage capacity, and the charge cut-off depth using the following formula: Qcharge=Qfull*(100%-n%-DOD_EOC), Wherein, Qcharge is the actual full charge capacity of the battery, Qfull is the actual full charge capacity, n% is the ratio of the storage capacity to the maximum capacity of the battery, and DOD_EOC is the charge cut-off depth.

17. The charging control device according to claim 13 or 15, characterized in that: The determining unit determines the actual full charge capacity as follows: When the battery enters a static state, collecting a first discharge depth and a second discharge depth, wherein the first discharge depth and the second discharge depth are different discharge depths; determining a difference between the first depth of discharge and the second depth of discharge, and a charge and discharge capacity of the battery; The absolute value of the ratio between the charge-discharge capacity and the difference is taken as the actual full charge capacity.

18. The charging control device according to claim 17, characterized in that: The first discharge depth and the second discharge depth are discharge depths collected in a non-platform voltage region.

19. A charging control device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to execute the method according to any one of claims 1 to 9.

20. A storage medium, characterized in that: The storage medium stores instructions, and when the instructions in the storage medium are executed by a processor of the terminal, the terminal is enabled to execute the method according to any one of claims 1 to 9.

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