Charging control method, charging control device and storage medium

Abstract

The present disclosure relates to a charging control method, a charging control device and a storage medium. The charging control method disclosed in the present disclosure includes a battery charging process, the charging process includes multiple charging stages, and the charging control method includes: determining the current rate change threshold corresponding to the current charging stage for each charging stage in the multiple charging stages; determining the polling duration and current adjustment step corresponding to the current charging stage, wherein the ratio between the current adjustment step and the polling duration is greater than the current rate change threshold; in the current charging stage, the charging current value is detected with the polling duration, and if the charging current value is greater than the specified current threshold, the current is adjusted according to the current adjustment step. The charging control method disclosed in the present disclosure can achieve precise control of the charging current during high-power charging.

Description

Technical Field

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

[0002] As the functions of mobile terminals become more and more complete, the usage scenarios of mobile terminals are also increasing. In order to meet the needs of users and improve the standby time and charging speed of mobile terminals, high-power fast charging technology is often used to charge mobile terminals. There are multiple charging stages in the high-power fast charging process. When switching between each charging stage, the CV mode can be used to adjust the current change.

[0003] Generally, a charge pump is used for high-power fast charging, but the charge pump itself does not have the ability to control the charging output voltage and current, so the SCV software constant voltage charging control method is needed for regulation. In the related art, the charging current is polled at a fixed time interval. If the charging current is greater than a specified threshold, the current gear is adjusted with a fixed step size, or if the charging voltage reaches a specified voltage threshold, the voltage gear is adjusted with a fixed step size to adjust the current change.

[0004] However, in high-power fast charging, since the switching rate of each charging stage is relatively fast, the switching rate that can be achieved when switching the charging stage according to a fixed polling time and a fixed step size is relatively slow, which will cause the charging voltage to be overvoltage in some charging stages and cannot meet the requirements for precise voltage control in high-power charging technology. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a charging control method, a charging control device and a storage medium.

[0006] According to a first aspect of an embodiment of the present disclosure, a charging control method is provided, including a battery charging process, wherein the charging process includes multiple charging stages, and the charging control method includes: determining a current rate change threshold corresponding to a current charging stage for each of the multiple charging stages; determining a polling duration and a current adjustment step corresponding to the current charging stage, wherein a ratio between the current adjustment step and the polling duration is greater than the current rate change threshold; in the current charging stage, detecting a charging current value with the polling duration, and if the charging current value is greater than a specified current threshold, adjusting the current according to the current adjustment step.

[0007] In one embodiment, the method further includes: determining a current rate change threshold corresponding to each charging stage in the multiple charging stages based on charging curves corresponding to the multiple charging stages included in the battery cell charging process.

[0008] In one embodiment, the method of determining the current rate change threshold corresponding to each charging stage in the multiple charging stages based on the charging curves corresponding to the multiple charging stages included in the battery cell charging process includes: performing a charging test on the battery cell through an external power supply, and collecting a complete charging curve corresponding to the battery cell charging test process; segmenting the complete charging curve based on voltage to obtain multiple segmented charging curves corresponding to the multiple charging stages; fitting the multiple segmented charging curves to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, and using the slope extreme value as the current rate change threshold corresponding to each charging stage.

[0009] In one embodiment, the charging test of the battery cell by an external power supply includes: based on multiple different ambient temperatures, the battery cell is charged by an external power supply; the multiple segmented charging curves are fitted to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, including: based on the multiple different ambient temperatures, the multiple segmented charging curves are fitted to obtain a slope extreme value function associated with the temperature.

[0010] In one embodiment, determining the current rate change threshold corresponding to the current charging stage includes: determining the current ambient temperature, and based on the current ambient temperature and the slope extreme value function associated with the temperature, determining the slope extreme value corresponding to the current ambient temperature, and using the slope extreme value corresponding to the current ambient temperature as the current rate change threshold.

[0011] In one embodiment, determining the polling duration and current adjustment step corresponding to the current charging stage includes: determining the minimum polling duration and the minimum current adjustment step; determining the polling duration adjustment parameter and the current adjustment parameter based on the current rate change threshold, wherein the product of the polling duration parameter and the minimum polling duration is the polling duration, and the product of the current adjustment parameter and the minimum current adjustment step is the current adjustment step.

[0012] According to a second aspect of an embodiment of the present disclosure, a charging control device is provided for a battery charging process, wherein the charging process includes multiple charging stages, including: a determination unit, for determining, for each charging stage in the multiple charging stages, a current rate change threshold corresponding to the current charging stage, and determining a polling duration and a current adjustment step corresponding to the current charging stage, wherein a ratio between the current adjustment step and the polling duration is greater than the current rate change threshold; and an adjustment unit, for detecting a charging current value with the polling duration in the current charging stage, and adjusting the current according to the current adjustment step if the charging current value is greater than a specified current threshold.

[0013] In one embodiment, the determination unit is further configured to determine a current rate change threshold corresponding to each of the multiple charging stages based on charging curves corresponding to the multiple charging stages included in the battery cell charging process.

[0014] In one embodiment, the determination unit determines the current rate change threshold corresponding to each of the multiple charging stages in the battery cell charging process based on the charging curves corresponding to the multiple charging stages included in the battery cell charging process in the following manner: performing a charging test on the battery cell through an external power supply, and collecting a complete charging curve corresponding to the battery cell charging test process; segmenting the complete charging curve based on voltage to obtain multiple segmented charging curves corresponding to the multiple charging stages; fitting the multiple segmented charging curves to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, and using the slope extreme value as the current rate change threshold corresponding to each charging stage.

[0015] In one embodiment, the determination unit performs a charging test on the battery cell through an external power supply in the following manner: based on multiple different ambient temperatures, the battery cell is charged and tested through an external power supply; the multiple segmented charging curves are fitted to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, including: based on the multiple different ambient temperatures, the multiple segmented charging curves are fitted to obtain a slope extreme value function associated with the temperature.

[0016] In one embodiment, the determination unit determines the current rate change threshold corresponding to the current charging stage in the following manner: determine the current ambient temperature, and based on the current ambient temperature and the slope extreme value function associated with the temperature, determine the slope extreme value corresponding to the current ambient temperature, and use the slope extreme value corresponding to the current ambient temperature as the current rate change threshold.

[0017] In one embodiment, determining the polling duration and current adjustment step corresponding to the current charging stage includes: determining the minimum polling duration and the minimum current adjustment step; determining the polling duration adjustment parameter and the current adjustment parameter based on the current rate change threshold, wherein the product of the polling duration parameter and the minimum polling duration is the polling duration, and the product of the current adjustment parameter and the minimum current adjustment step is the current adjustment step.

[0018] According to a third aspect of an embodiment of the present disclosure, a charging control device is provided, comprising: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to: execute the charging control method described in the first aspect or any one embodiment of the first aspect.

[0019] According to the fourth aspect of the embodiments of the present disclosure, a non-temporary computer-readable storage medium is provided. When the instructions in the storage medium are executed by the processor of the mobile terminal, the mobile terminal can execute the charging control method described in the first aspect or any one of the embodiments of the first aspect.

[0020] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the charging control method of the present disclosure determines the current rate change threshold, polling duration and current adjustment step corresponding to the current charging stage, and adjusts the current in the current charging stage to keep the ratio of the current adjustment step to the polling duration greater than the current rate change threshold. Such a configuration can achieve precise control of the charging current during high-power charging, thereby avoiding voltage overvoltage on the battery during the switching process of each charging stage.

[0021] 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

[0022] 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.

[0023] Figure 1 The figure is a flow chart of a charging control method according to an exemplary embodiment.

[0024] Figure 2 is a flow chart showing a charging control method according to another exemplary embodiment.

[0025] Figure 3 is a complete charging curve diagram of a battery according to an exemplary embodiment.

[0026] Figure 4 is a flow chart showing a method for determining a current rate change threshold according to another exemplary embodiment.

[0027] Figure 5 is a flow chart showing a method for determining a current rate change threshold according to another exemplary embodiment.

[0028] Figure 6 is a flow chart showing a charging control method according to another exemplary embodiment.

[0029] Figure 7 is a block diagram of a charging control device according to an exemplary embodiment.

[0030] Figure 8 It is a block diagram of a device according to an exemplary embodiment. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] As the use scenarios of mobile terminals increase, users have higher requirements for the charging speed and standby time of mobile terminals. In order to meet the needs of users, more and more terminal equipment manufacturers have begun to provide mobile terminals that can be applied to fast charging technology. In order to apply to fast charging technology, dual-cell batteries can be used, that is, two batteries are combined in series, which can increase the charging power.

[0033] In the technical field of battery charging, when the charging power is small, such as in the trickle charging stage and the cut-off charging stage, the charging current is generally below 2A, and an integrated power management circuit (Power Management IC, PMIC) is used for charging management. PMIC has a power management function, which can control the charging output voltage and current, and adjust the voltage and current during the charging process. When the charging power is large, a charge pump is generally used. The charge pump can generate an output voltage greater than the input voltage. For example, when the charge pump uses a 2:1 charger for charging, it can generate an output voltage twice the input voltage. The charge pump has high charging efficiency and is suitable for high-power charging.

[0034] There are multiple charging stages (step charge) in the high-power charging process. The CV drop method is the best method for switching between each step charge charging stage. Since the 2:1 charger is working in this process, it does not have the ability to control the charging output voltage and current, so a controller is needed to adjust it. In the related art, in each charging stage, the method of implementing CV using a 2:1 circuit is to implement it through a control software control loop, and the method used is to poll through an AP or an independent MCU controller and a charging adapter. After polling, when the detected charging voltage reaches the threshold, the current or voltage is reduced by a fixed number of gears, so that the detected charging voltage can be close to but not exceed the threshold of the charging voltage, so that the charging power can be increased as much as possible within the range that the battery can withstand, thereby improving the charging efficiency. It can be explained that each time the current or voltage is reduced, a new charging stage is reached. The control method when switching each charging stage can adopt CV mode or CC mode. If CC mode is adopted, when the detected voltage reaches the threshold, the current is reduced by a fixed number of gears, for example, it can be reduced by 50mA. If CV mode is adopted, when the detected voltage value reaches the threshold, the voltage is reduced by a fixed number of gears, for example, it can be reduced by 20mV.

[0035] Since the charge pump used for high-power charging does not have the function of controlling the charging output voltage and current, it is necessary to cooperate with the controller and the charging adapter to poll through the control software control loop to achieve the CC mode or CV mode regulation method. In the related technology, the CV mode regulation method is usually adopted, that is, when the detected voltage value reaches the threshold, the current is reduced by a fixed number of gears, and the comparison is repeated so that the detected voltage value is close to but does not exceed the threshold of the charging voltage. This method is the software constant voltage method.

[0036] In the process of charging a single-cell battery, the polling duration is usually fixed, and the current adjustment step (sometimes also called the number of gears) is fixed. That is, polling is performed at a fixed interval, and when the detected voltage reaches the threshold, the fixed step of 1-2 gears is reduced each time to achieve software constant voltage charging control. In the process of charging a single-cell battery, the fixed polling duration is generally 200mS, and the fixed step is generally 50mA.

[0037] However, during high-power charging, such as charging a dual-cell battery, the rate at which each charging stage is switched, that is, the rate of change of the step length relative to the duration during the switching of each charging stage is relatively large, for example, it can be twice the rate of change of the corresponding charging stage switching during the charging of a single-cell battery. At this time, continuing to use the fixed duration and fixed step length adjustment method cannot accurately adjust the changes in different charging stages during high-power charging, resulting in the phenomenon of charging voltage overvoltage during the charging process.

[0038] In response to the above technical solution, the present disclosure provides a charging control method, specifically a software constant voltage charging control method, which can accurately adjust the switching of each charging stage during high-power charging of the battery, thereby avoiding the problem of charging voltage overvoltage during high-power charging.

[0039] The charging control method disclosed in the present invention can be used for high-power charging of a battery of a terminal device, for example, it can be used for charging a dual-cell battery. In the present disclosure, the terminal device can be a mobile phone, a tablet computer, a laptop computer, a wearable device, a personal handheld assistant, etc. The present disclosure does not limit the specific type of the terminal device.

[0040] In the present disclosure, during high-power charging of a battery, in order to maintain constant-voltage charging of the battery, a CV mode regulation method is used to regulate the charging current, that is, when the detected voltage value reaches a threshold value, the current is adjusted, and the comparison is repeated so that the detected voltage value is close to but does not exceed the threshold value of the charging voltage. This method of software constant voltage method allows multiple charging stages in the battery charging process, and the charging current of each charging stage is different. The switching time between each charging stage and the change step size of the charging current are different, that is, the current change rate of switching between each charging stage is different.

[0041] Figure 1 is a flow chart of a charging control method according to an exemplary embodiment. Figure 1 The charging control method is used in a battery charging process, and the battery charging process includes multiple charging stages. The charging control method disclosed in the present invention includes the following steps S11 to S13.

[0042] In step S11 , a current rate change threshold corresponding to the current charging stage is determined for each of the multiple charging stages.

[0043] In the embodiment of the present disclosure, for the same battery, in multiple charging stages during the charging process of the battery, there is a current rate change threshold for the current change rate during the switching process of each charging stage, that is, during the charging process of the battery, the current change rate during the switching process of each charging stage will not exceed the current rate change threshold. The present disclosure first determines the current change rate threshold of the charging stage corresponding to the current charging stage in step S11.

[0044] In step S12, the polling duration and the current adjustment step length corresponding to the current charging stage are determined, wherein the ratio between the current adjustment step length and the polling duration is greater than the current rate change threshold.

[0045] In the embodiment of the present disclosure, a charge pump can be configured to charge the battery at high power. For example, a charge pump with a 2:1 charger configuration can be used for charging, which can be suitable for charging dual-cell batteries. Since the charge pump does not have the function of controlling the charging output voltage and current, it is necessary to cooperate with control software such as a controller to adjust the output voltage and current, and poll the control loop. The control loop is polled by the control software, and when the detected voltage value reaches the threshold, the current is reduced. The time used at this time is the polling duration, and the corresponding reduced current is the current adjustment step. In the present disclosure, by setting the ratio between the current adjustment step and the polling duration to be greater than the current rate change threshold, when the battery is charged using the charging control method of the present disclosure, the current rate change in the process of switching each charging stage exceeds the current rate change threshold, thereby being able to keep the charging voltage in each charging stage of the charging process from exceeding the voltage threshold corresponding to the charging stage.

[0046] In step S13, in the current charging stage, the charging current value is detected with a polling duration, and if the charging current value is greater than a specified current threshold, the current is adjusted according to the current adjustment step.

[0047] In the embodiment of the present disclosure, since the current rate change threshold, polling duration and current adjustment step can be determined for each charging stage in multiple charging stages, and the ratio between the current adjustment step and the polling duration is set to be greater than the current rate change threshold. In the present disclosure, the charging voltage is detected once every polling duration, and when it is detected that the charging current is greater than the specified current threshold, the current is adjusted according to the corresponding current adjustment step. Such a setting can achieve precise adjustment of the current change during the high-power charging process of the battery, keep the charging voltage from overvoltage (not exceeding the voltage threshold corresponding to the charging stage), and achieve the purpose of constant voltage charging.

[0048] Figure 2 is a flow chart of a charging control method according to another exemplary embodiment. Figure 2, the charging control method disclosed in the present invention comprises the following steps:

[0049] In step S21 , based on charging curves corresponding to multiple charging stages included in the battery cell charging process, a current rate change threshold corresponding to each charging stage in the multiple charging stages is determined.

[0050] In the embodiment of the present disclosure, for the same battery, there are multiple charging stages in the charging process of the battery, and the charging current and charging time of each charging stage are different. The charging current, charging voltage and charging time of the same battery in the charging process can be recorded and plotted into an image, which is the complete charging curve of the battery.

[0051] Figure 3 is a complete charging curve diagram of a battery according to an exemplary embodiment. Figure 3 , the horizontal axis is the charging time T, the vertical axis on the left is the charging current I, and the vertical axis on the right is the charging voltage U. The charging curve of each charging stage can be obtained based on the complete charging curve, as shown in the current slope change area in the figure. For each charging stage, the slope function K of each charging stage can be obtained by polynomial fitting or exponential fitting, and K is the current rate change threshold corresponding to each charging stage.

[0052] In step S22, the polling duration and the current adjustment step length corresponding to the current charging stage are determined, wherein the ratio between the current adjustment step length and the polling duration is greater than the current rate change threshold.

[0053] In step S23, in the current charging stage, the charging current value is detected with the polling duration, and if the charging current value is greater than the specified current threshold, the current is adjusted according to the current adjustment step.

[0054] The embodiment of the present disclosure will hereinafter describe the implementation process of determining the current rate change threshold.

[0055] Figure 4 FIG. 1 is a flow chart showing a method for determining a current rate change threshold according to an exemplary embodiment. Figure 4 , the determination of the current rate change threshold of the present disclosure includes the following steps:

[0056] In step S31, a charging test is performed on the battery cell through an external power supply, and a complete charging curve corresponding to the battery cell charging test process is collected.

[0057] In the embodiment of the present disclosure, an external power source is used to perform a charging test on the battery cell to collect a complete charging curve corresponding to the battery cell charging test process. For example, the external power source may be an external program-controlled power source.

[0058] By replacing the control software and charging device in the mobile terminal that controls and adjusts the charging current and voltage with an external power supply, the control is freer and the setting is more accurate. For example, the battery cell can be charged and tested in different environments, such as different temperatures or different humidity.

[0059] In step S32, the complete charging curve is segmented based on the voltage to obtain a plurality of segmented charging curves corresponding to a plurality of charging stages.

[0060] In the embodiment of the present disclosure, the charging curve of each charging stage can be determined based on the complete charging curve collected by the power supply charging, such as Figure 3 The current slope changes in the area.

[0061] The disclosed embodiment can segment the UI complete charging curve based on voltage. For example,

[0062] In the first section, Vcell = 8.45V, the slope function is a1*X^2+b1*X+c1;

[0063] The second section, Vcell = 8.7V, the slope function is a2*X^2+b2*X+c2;

[0064] In the third section, Vcell=8.96V, the slope function is a3*X^2+b3*X+c3.

[0065] In step S33, multiple segmented charging curves are fitted to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, and the slope extreme value is used as the current rate change threshold corresponding to each charging stage.

[0066] For each segmented charging curve, the embodiment of the present disclosure performs polynomial fitting based on the measured curve plotting points, and then calculates the first-order derivative. For example, the result of the segmented charging curve fitting is a*X^2+b*X+c, and its first-order derivative is 2a*X+b. Since a and b are known, the maximum value of the first-order inverse can be calculated, and then X can be calculated. In this way, the slope extreme value K of the charging stage (CV interval) corresponding to this segmented curve can be calculated.

[0067] In the present disclosure, for the same battery, the complete charging curves obtained under different charging environments are different, and the corresponding current rate change thresholds for each charging stage will also be different. The embodiments of the present disclosure can use an external power supply to perform charging tests on battery cells under different environments, and the different complete charging curves obtained can obtain different slope extreme values ​​according to different complete charging conditions. By comparing multiple slope extreme values, the largest slope extreme value can be selected as the current rate change threshold corresponding to each charging stage.

[0068] Figure 5 FIG. 1 is a flow chart showing a method for determining a current rate change threshold according to another exemplary embodiment. Figure 5 , the determination of the current rate change threshold of the present disclosure includes the following steps:

[0069] In step S41, a charging test is performed on the battery cells through an external power source based on a plurality of different ambient temperatures.

[0070] In the embodiment of the present disclosure, different complete charging curves can be obtained by performing charging tests on battery cells at different ambient temperatures using an external power supply.

[0071] In step S42, fitting is performed on the plurality of segmented charging curves to obtain the slope extreme value of each segmented charging curve in the plurality of segmented charging curves.

[0072] In step S43, multiple segmented charging curves are fitted based on multiple different ambient temperatures to obtain a slope extreme value function associated with the temperature.

[0073] In the embodiment of the present disclosure, the complete charging curves obtained at different ambient temperatures are different. According to the different complete charging curves, the slope extreme value of each segmented charging curve at different ambient temperatures can be obtained, and the slope extreme value is the slope extreme value function associated with the temperature.

[0074] In step S44 , a current rate change threshold corresponding to each charging stage is determined based on a slope extreme value function associated with temperature.

[0075] In the embodiment of the present disclosure, since the slope extreme value function associated with the temperature is different at different ambient temperatures, the corresponding current rate change threshold at the temperature is also different.

[0076] Figure 6 is a flow chart of a charging control method according to another exemplary embodiment. Figure 6 , the charging control method disclosed in the present invention comprises the following steps:

[0077] In step S51, the current ambient temperature is determined, and based on the current ambient temperature and the slope extreme value function associated with the temperature, the slope extreme value corresponding to the current ambient temperature is determined, and the slope extreme value corresponding to the current ambient temperature is used as the current rate change threshold.

[0078] In step S52, the polling duration and the current adjustment step length corresponding to the current charging stage are determined, wherein the ratio of the current adjustment step length to the polling duration is greater than the current rate change threshold.

[0079] In step S53, in the current charging stage, the charging current value is detected with the polling duration, and if the charging current value is greater than the specified current threshold, the current is adjusted according to the current adjustment step.

[0080] In the embodiment of the present disclosure, different current rate change thresholds can be obtained under different ambient temperatures and correspondingly set so that during the battery charging process, the ratio of the current adjustment step to the polling duration is greater than the current rate change threshold at different ambient temperatures.

[0081] In the embodiment of the present disclosure, at different ambient temperatures, the obtained slope extreme value function associated with the temperature is different, the corresponding slope extreme value is different, and the current rate change threshold is different. The charging control method of the present disclosure first determines the current ambient temperature, and then sequentially determines the slope extreme value function associated with the temperature, the slope extreme value, and the current rate change threshold. The current rate change threshold finally obtained is the current rate change threshold associated with the current ambient temperature.

[0082] In an embodiment of the present disclosure, a current rate change threshold associated with the current ambient temperature is used as a basis for adjusting the ratio between the current adjustment step and the polling duration, so that the polling duration and current adjustment step corresponding to the current charging stage finally determined are also associated with the current ambient temperature.

[0083] In the embodiment of the present disclosure, the specified current threshold value obtained according to the polling duration and the current adjustment step associated with the current ambient temperature is also associated with the current ambient temperature. The current can be adjusted in steps associated with the current ambient temperature according to the specified current threshold value associated with the ambient temperature. That is, according to the charging control method, different current adjustment steps can be made for the charging current at different ambient temperatures.

[0084] For example, the higher the temperature, the greater the internal resistance of the battery, the greater the threshold of the current rate change when switching the charging stage during the charging process of the battery, and the greater the adjustment made to the charging current. This setting allows the charging current to be adjusted accordingly according to different temperatures when charging the battery at different ambient temperatures, so as to achieve more accurate control of the charging process of the battery at different ambient temperatures. In the process of maintaining the constant voltage charging of the battery, on the one hand, the charging voltage can be kept from overvoltage, and on the other hand, the charging voltage can be kept as close to the threshold as possible to ensure charging efficiency.

[0085] After the current rate change threshold is determined in the embodiment of the present disclosure, the polling duration and current adjustment step corresponding to the current charging stage can be determined based on the minimum polling duration and the minimum current adjustment step when determining the current rate change threshold. The minimum polling duration and the minimum current adjustment step can be determined based on the battery properties.

[0086] In one implementation, a minimum polling duration and a minimum current adjustment step are determined. A polling duration adjustment parameter and a current adjustment parameter are determined based on a current rate change threshold. The product of the polling duration parameter and the minimum polling duration is the polling duration, and the product of the current adjustment parameter and the minimum current adjustment step is the current adjustment step.

[0087] In one example, after finding the slope extreme value K (unit: mA / s), the software loop step length ΔI and polling time Δt are calculated based on the 2:1 Charge Pump of the whole machine. The minimum step length of Δt is dt=0.2s, and the minimum step length of ΔI is dI=50mA. This satisfies ΔI / Δt=(N1*dI) / (N2*dt)>K. Among them, N1 and N2 are the control parameters of the step charge CV stage.

[0088] Based on the same concept, an embodiment of the present disclosure also provides a charging control device.

[0089] 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.

[0090] Figure 7 FIG. 1 is a block diagram of a charging control device according to an exemplary embodiment. Figure 7 The device includes a determining unit 121 and an adjusting unit 122.

[0091] The determining unit 121 is configured to determine the current rate change threshold corresponding to the current charging stage for each charging stage in the multiple charging stages, and determine the polling duration and current adjustment step length corresponding to the current charging stage, wherein the ratio between the current adjustment step length and the polling duration is greater than the current rate change threshold

[0092] The adjustment unit 122 is configured to detect the charging current value with a polling duration in the current charging phase, and if the charging current value is greater than a specified current threshold, adjust the current according to the current adjustment step.

[0093] In one embodiment, the determining unit 121 is further configured to determine a current rate change threshold corresponding to each of the multiple charging stages based on charging curves corresponding to the multiple charging stages included in the battery cell charging process.

[0094] In one embodiment, the determination unit 121 determines the current rate change threshold corresponding to each charging stage in the multiple charging stages based on the charging curves corresponding to the multiple charging stages included in the battery cell charging process in the following manner: the battery cell is charged and tested by an external power supply, and a complete charging curve corresponding to the battery cell charging test process is collected; the complete charging curve is segmented based on the voltage to obtain multiple segmented charging curves corresponding to the multiple charging stages; the multiple segmented charging curves are fitted to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, and the slope extreme value is used as the current rate change threshold corresponding to each charging stage.

[0095] In one embodiment, the determination unit 121 performs a charging test on the battery cell through an external power supply in the following manner: based on multiple different ambient temperatures, the battery cell is charged and tested through an external power supply; the multiple segmented charging curves are fitted to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, including: based on the multiple different ambient temperatures, the multiple segmented charging curves are fitted to obtain a slope extreme value function associated with the temperature.

[0096] In one embodiment, the determination unit 121 determines the current rate change threshold corresponding to the current charging stage in the following manner: determine the current ambient temperature, and based on the current ambient temperature and the slope extreme value function associated with the temperature, determine the slope extreme value corresponding to the current ambient temperature, and use the slope extreme value corresponding to the current ambient temperature as the current rate change threshold.

[0097] In one embodiment, determining the polling duration and current adjustment step corresponding to the current charging stage includes: determining the minimum polling duration and the minimum current adjustment step; determining the polling duration adjustment parameter and the current adjustment parameter based on the current rate change threshold, wherein the product of the polling duration parameter and the minimum polling duration is the polling duration, and the product of the current adjustment parameter and the minimum current adjustment step is the current adjustment step.

[0098] 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.

[0099] Figure 88 is a block diagram of an apparatus 800 for data collection based on gain switching according to an exemplary embodiment. For example, the apparatus 800 for data collection based on gain switching 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.

[0100] Reference Figure 8 , the device 800 for gain switching-based data acquisition may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0101] The processing component 802 generally controls the overall operation of the apparatus 800 for data acquisition based on gain switching, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.

[0102] The memory 804 is configured to store various types of data to support the operation of the apparatus 800 for data acquisition based on gain switching. Examples of such data include instructions for any application or method operating on the apparatus 800 for data acquisition based on gain switching, contact data, phone book data, messages, pictures, videos, etc. The memory 804 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.

[0103] The power component 806 provides power to various components of the apparatus for gain-switching-based data collection 800. The power component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus for gain-switching-based data collection 800.

[0104] The multimedia component 808 includes a screen providing an output interface between the device 800 for data acquisition based on gain switching 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 808 includes a front camera and / or a rear camera. When the device 800 for data acquisition based on gain switching 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 the rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0105] The audio component 810 is configured to output and / or input audio signals. For example, the audio component 810 includes a microphone (MIC), and when the device 800 for data acquisition based on gain switching is in an operating 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 804 or sent via the communication component 816. In some embodiments, the audio component 810 also includes a speaker for outputting audio signals.

[0106] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: home button, volume button, start button, and lock button.

[0107] The sensor assembly 814 includes one or more sensors for providing various aspects of status assessment for the device 800 for data acquisition based on gain switching. For example, the sensor assembly 814 can detect the open / closed state of the device 800 for data acquisition based on gain switching, the relative positioning of components, such as the display and keypad of the device 800 for data acquisition based on gain switching, and the sensor assembly 814 can also detect the position change of the device 800 for taking off and capturing or a component of the device 800 for taking off and capturing, the presence or absence of user contact with the device 800 for data acquisition based on gain switching, the orientation or acceleration / deceleration of the device 800 for data acquisition based on gain switching, and the temperature change of the device 800 for data acquisition based on gain switching. The sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0108] The communication component 816 is configured to facilitate wired or wireless communication between the device 800 for data collection based on gain switching and other devices. The device 800 for data collection based on gain switching 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 816 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 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.

[0109] In an exemplary embodiment, the apparatus 800 for data acquisition based on gain switching 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.

[0110] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, and the instructions can be executed by a processor 820 of the apparatus 800 for data acquisition based on gain switching to complete 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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 variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0115] It should be understood that the present disclosure is not limited to the exact 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 appended claims.

Claims

1. A charging control method, It is characterized in that Used in a battery charging process, the charging process includes multiple charging stages, and the charging control method includes: determining a current rate change threshold value corresponding to the current charging stage for each of the multiple charging stages; Determine a polling duration and a current adjustment step length corresponding to the current charging stage, wherein a ratio between the current adjustment step length and the polling duration is greater than the current rate change threshold; In the current charging stage, the charging current value is detected with the polling duration, and if the charging current value is greater than a specified current threshold, the current is adjusted according to the current adjustment step length; Among them, determining the polling duration and current adjustment step corresponding to the current charging stage includes: determining the minimum polling duration and the minimum current adjustment step; determining the polling duration adjustment parameter and the current adjustment parameter based on the current rate change threshold, wherein the product of the polling duration parameter and the minimum polling duration is the polling duration, and the product of the current adjustment parameter and the minimum current adjustment step is the current adjustment step.

2. The charging control method according to claim 1, It is characterized in that The method further comprises: Based on charging curves corresponding to a plurality of charging stages included in a battery cell charging process, a current rate change threshold corresponding to each charging stage in the plurality of charging stages is determined.

3. The charging control method according to claim 2, It is characterized in that The determining, based on charging curves corresponding to multiple charging stages included in the battery cell charging process, a current rate change threshold corresponding to each charging stage in the multiple charging stages includes: Perform a charging test on the battery cell through an external power supply, and collect the corresponding complete charging curve during the battery cell charging test process; Segmenting the complete charging curve based on voltage to obtain multiple segmented charging curves corresponding to multiple charging stages; Fitting is performed on the multiple segmented charging curves to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, and the slope extreme value is used as the current rate change threshold corresponding to each charging stage.

4. The charging control method according to claim 3, It is characterized in that The charging test of the battery cell by using an external power supply includes: Based on multiple different ambient temperatures, the battery cells are charged and tested through an external power supply; Fitting the multiple segmented charging curves to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves includes: Based on the multiple different ambient temperatures, the multiple segmented charging curves are fitted to obtain a slope extreme value function associated with the temperature.

5. The charging control method according to claim 4, It is characterized in that The determining of the current rate change threshold corresponding to the current charging stage includes: The current ambient temperature is determined, and based on the current ambient temperature and the slope extreme value function associated with the temperature, a slope extreme value corresponding to the current ambient temperature is determined, and the slope extreme value corresponding to the current ambient temperature is used as a current rate change threshold.

6. A charging control device, It is characterized in that For a battery charging process, the charging process includes multiple charging stages, including: A determination unit, configured to determine, for each of the multiple charging stages, a current rate change threshold corresponding to the current charging stage, and determine a polling duration and a current adjustment step corresponding to the current charging stage, wherein a ratio between the current adjustment step and the polling duration is greater than the current rate change threshold; and determining the polling duration and the current adjustment step corresponding to the current charging stage, comprising: determining a minimum polling duration and a minimum current adjustment step; determining a polling duration adjustment parameter and a current adjustment parameter based on the current rate change threshold, wherein a product of the polling duration parameter and the minimum polling duration is the polling duration, and a product of the current adjustment parameter and the minimum current adjustment step is the current adjustment step; The adjustment unit is used to detect the charging current value with the polling duration in the current charging stage, and if the charging current value is greater than a specified current threshold, adjust the current according to the current adjustment step.

7. The charging control device according to claim 6, It is characterized in that The determining unit is further configured to determine a current rate change threshold corresponding to each charging stage in the multiple charging stages based on charging curves corresponding to the multiple charging stages included in the charging process of the battery cell.

8. The charging control device according to claim 7, It is characterized in that The determining unit determines the current rate change threshold corresponding to each of the multiple charging stages in the charging process of the battery cell based on the charging curves corresponding to the multiple charging stages in the charging process of the battery cell in the following manner: Perform a charging test on the battery cell through an external power supply, and collect the corresponding complete charging curve during the battery cell charging test process; Segmenting the complete charging curve based on voltage to obtain multiple segmented charging curves corresponding to multiple charging stages; Fitting is performed on the multiple segmented charging curves to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves, and the slope extreme value is used as the current rate change threshold corresponding to each charging stage.

9. The charging control device according to claim 8, It is characterized in that The determination unit performs a charging test on the battery cell through an external power supply in the following manner: Based on multiple different ambient temperatures, the battery cells are charged and tested through an external power supply; Fitting the multiple segmented charging curves to obtain the slope extreme value of each segmented charging curve in the multiple segmented charging curves includes: Based on the multiple different ambient temperatures, the multiple segmented charging curves are fitted to obtain a slope extreme value function associated with the temperature.

10. The charging control device according to claim 9, It is characterized in that The determination unit determines the current rate change threshold corresponding to the current charging stage in the following manner: The current ambient temperature is determined, and based on the current ambient temperature and the slope extreme value function associated with the temperature, a slope extreme value corresponding to the current ambient temperature is determined, and the slope extreme value corresponding to the current ambient temperature is used as a current rate change threshold.

11. A charging control device, It is characterized in that include: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to: execute the charging control method according to any one of claims 1 to 5.

12. A non-transitory computer-readable storage medium, It is characterized in that When the instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to execute the charging control method according to any one of claims 1 to 5.

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