A charging method, a charging chip and a terminal device

Abstract

The embodiment of the present invention discloses a charging method, a charging chip and a terminal device, which are applied in the field of terminal technology and can solve the problem of low battery utilization during charging. It includes: N different charging stages use different charging currents to charge the battery, the N different charging stages are divided according to the battery power parameters, and N is an integer greater than or equal to 2; wherein, the first charging stage uses the maximum charging current value allowed by the battery to charge to the preset power parameter, and in the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until it reaches a full state, and the charging current value of each charging stage from the second charging stage to the Nth charging stage decreases successively, and the charging current value of the Nth charging stage is less than or equal to the preset current value, and the preset current value is determined according to the maximum allowable floating pressure and the internal resistance of the battery. The method is applied to the scenario of charging the terminal device.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of terminal technology, and in particular to a charging method, a charging chip and a terminal device. Background Art

[0002] At present, wearable devices are becoming smaller and smaller. The battery space in wearable devices is small, and the battery capacity is difficult to increase. However, the functions of wearable devices are becoming more and more abundant, and they have more power-intensive application functions (for example, taking pictures, video chatting, and recording videos, etc.), which makes the battery life of wearable devices worse and worse. Therefore, it is necessary to maximize the utilization rate of the battery when charging.

[0003] Usually, the battery size of wearable devices is relatively small, which makes the internal resistance of the battery relatively large. In actual products, the internal resistance of small batteries within 1000mAh reaches more than 250 milliohms. The large internal resistance of the battery will cause the battery to generate floating pressure during charging. For example, when charging a battery with 0.5A, a floating pressure of 0.5*0.25=0.125V will be generated, which is equivalent to the maximum charging floating pressure reaching 0.125V during the charging process. Although the floating pressure will decrease as the current decreases during the subsequent constant voltage charging process, it is difficult to completely eliminate it, so the battery utilization rate will be very low. Summary of the invention

[0004] The embodiment of the present invention provides a charging method, a charging chip and a terminal device to solve the problem of low battery utilization in the prior art. In order to solve the above technical problems, the embodiment of the present invention is implemented as follows:

[0005] In a first aspect, a charging method is provided, the method comprising: N different charging stages, the N different charging stages being divided according to a power parameter of a battery, the N different charging stages using different charging currents to charge the battery, and N being an integer greater than or equal to 2;

[0006] Among them, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and in the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a full state, and the charging current value of each charging stage from the second charging stage to the Nth charging stage decreases successively, and the charging current value of the Nth charging stage is less than or equal to the preset current value, and the preset current value is determined based on the maximum allowable floating pressure and the internal resistance of the battery.

[0007] Optionally, the method comprises:

[0008] The preset current value is determined according to the quotient of the maximum allowable floating pressure and the internal resistance of the battery.

[0009] Optionally, the method comprises:

[0010] The value of N is determined according to the internal resistance of the battery and the maximum allowable internal resistance.

[0011] Optionally, in the N charging stages, the decreasing amount of the charging current value in each charging stage is the same.

[0012] Optionally, the decreasing amount of the charging current value is obtained according to the following formula:

[0013] A=(I max -I N ) / (N-1);

[0014] Where A represents the decreasing amount of charging current, I max Indicates the maximum charging current value, I N represents the charging current of the Nth charging stage, and N represents the total number of charging stages.

[0015] Optionally, the power parameter is a power percentage, or the power parameter is a voltage value.

[0016] In a second aspect, a charging chip is provided, including:

[0017] A charging module, used for charging the battery with different charging currents in N different charging stages, wherein the N different charging stages are divided according to a power parameter of the battery, and N is an integer greater than or equal to 2;

[0018] Among them, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and in the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a full state, and the charging current value of each charging stage from the second charging stage to the Nth charging stage decreases successively, and the charging current value of the Nth constant current charging stage is less than or equal to the preset current value, and the preset current value is determined based on the maximum allowable floating pressure and the internal resistance of the battery.

[0019] In a third aspect, a terminal device is provided, comprising the charging chip according to the second aspect.

[0020] In a fourth aspect, a computer-readable storage medium is provided, which stores a computer program, wherein the computer program enables a computer to execute the charging method in the first aspect of the embodiment of the present invention or its optional implementation. The computer-readable storage medium includes ROM / RAM, a magnetic disk or an optical disk, etc.

[0021] In a fifth aspect, a computer program product is provided. When the computer program product is run on a computer, the computer is enabled to execute the charging method in the first aspect or its optional implementation.

[0022] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0023] In an embodiment of the present invention, charging can be divided into N different charging stages, and the N different charging stages are divided according to the battery power parameters. The N different charging stages use different charging currents to charge the battery, and N is an integer greater than or equal to 2; wherein, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and in the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a full state, and the charging current value of each charging stage from the second charging stage to the Nth charging stage decreases successively, and the first current value of the charging current of the last constant current charging stage is less than or equal to the preset current value, and the preset current value is determined based on the maximum allowable floating pressure and the internal resistance of the battery. Through this scheme, since the current value of each charging stage from the 2nd charging stage to the Nth charging stage decreases successively, and the first current value of the charging current in the last constant current charging stage is less than or equal to the preset current value, the preset current value is determined based on the maximum allowable float pressure and the internal resistance of the battery. In this way, the float pressure generated during charging will not be greater than the maximum allowable float pressure, so that the generated float pressure can be smaller, ensuring that the battery capacity can be utilized to the maximum extent, thereby improving the battery utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A charging curve diagram provided by an embodiment of the present invention Figure 1 ;

[0026] Figure 2 A charging curve diagram provided by an embodiment of the present invention Figure 2 ;

[0027] Figure 3 is a schematic flow chart of a charging method provided by an embodiment of the present invention;

[0028] Figure 4 A charging control system provided by an embodiment of the present invention is shown in FIG. Figure 1 ;

[0029] Figure 5 A charging curve diagram provided by an embodiment of the present invention Figure 3;

[0030] Figure 6 This is a schematic diagram of a power detection method provided by an embodiment of the present invention. Figure 1 ;

[0031] Figure 7 A charging curve diagram provided by an embodiment of the present invention Figure 4 ;

[0032] Figure 8 This is a schematic diagram of a power detection method provided by an embodiment of the present invention. Figure 2 ;

[0033] Fig. 9 A charging control system provided by an embodiment of the present invention is shown in FIG. Figure 2 ;

[0034] Fig.10 It is a structural schematic diagram of a charging chip provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatus.

[0037] It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0038] The embodiments of the present invention provide a charging method, a charging chip and a terminal device, which can improve the charging utilization rate.

[0039] The terminal device involved in the embodiment of the present invention may be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted terminal device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA) and other electronic devices. Among them, the wearable device may be a smart watch, a smart bracelet, a watch phone, a smart anklet, a smart earring, a smart necklace, a smart headset, etc., which is not limited in the embodiment of the present invention.

[0040] The charging method provided by the embodiment of the present invention is particularly suitable for terminal devices with relatively small battery capacity, such as wearable devices.

[0041] At present, wearable devices are becoming smaller and smaller. The battery space in wearable devices is small, and the battery capacity is difficult to increase. However, the functions of wearable devices are becoming more and more abundant, and they have more power-intensive application functions (for example, taking pictures, video chatting, and recording videos, etc.), which makes the battery life of wearable devices worse and worse. Therefore, it is necessary to maximize the utilization rate of the battery when charging.

[0042] Usually, the battery size of wearable devices is relatively small, which makes the internal resistance of the battery relatively large. In actual products, the internal resistance of small batteries within 1000mAh reaches more than 250 milliohms. The large internal resistance of the battery will cause the battery to generate floating pressure during charging. For example, charging with a 0.5A battery will generate a floating pressure of 0.5*0.25=0.125V, which is equivalent to the maximum floating pressure reaching 0.125V during the charging process. This makes it difficult to fully charge the battery and the utilization rate is low.

[0043] Another disadvantage of a small battery capacity is that the cut-off current required to fully charge the battery must be very small. Usually, the battery requires a charging cut-off current of less than 0.2C. (C refers to the capacity of the battery). For example, an 800mAh battery requires a full charge cut-off current of 0.2C, or 16mAh. There are basically no charging chips with such a small cut-off current on the market. The cut-off current of general charging chips on the market is generally above 50mA, which does not meet the full charge cut-off condition. Therefore, this will also cause small-capacity batteries to fail to be fully charged.

[0044] In order to improve battery utilization, the relevant technology selects charging chips with very small charging cut-off current, such as TI's BQ25618, which can cut off the battery to 20-30mA. The disadvantage of this approach is that in the current wearable device platform solution (such as the solution for phone watches), phone watches generally have their own charging chips. If an additional charging chip is added, it not only increases the cost of the product, but also takes up space in the phone watch, so this solution is rarely used. In addition, actual tests have found that even if a charging chip with a very small cut-off current is used, the improvement in battery utilization is still very limited, because the floating pressure generated during charging due to the large internal resistance of the battery is very large, which will cause the battery to be charged and cut off quickly.

[0045] The charging method provided in the embodiment of the present invention can solve the above-mentioned problems and improve the utilization rate of the battery.

[0046] The execution subject of the charging method provided in the embodiment of the present invention may be the above-mentioned terminal device, or may be a functional module and / or functional entity in the terminal device that can implement the charging method, which may be determined according to actual use requirements and is not limited in the embodiment of the present invention. The following takes the terminal device as an example to exemplify the charging method provided in the embodiment of the present invention.

[0047] An embodiment of the present invention provides a charging method, comprising: N different charging stages, the N different charging stages are divided according to the power parameters of the battery, the N different charging stages use different charging currents to charge the battery, and N is an integer greater than or equal to 2.

[0048] The above power parameters are used to characterize the power of the battery.

[0049] Among them, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and in the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a full state. The charging current value of each charging stage from the second charging stage to the Nth charging stage decreases successively, and the charging current value of the Nth charging stage is less than or equal to the preset current value, and the preset current value is determined based on the maximum allowable float pressure and the internal resistance of the battery.

[0050] In the embodiment of the present invention, the battery can be charged in N different charging stages, and the N different charging stages are divided according to the battery power parameters. The N different charging stages use different charging currents to charge the battery, and N is an integer greater than or equal to 2; wherein, the first charging stage is charged to the preset power parameter with the maximum charging current value allowed by the battery, and the battery is charged from the preset power parameter to the full state in the second charging stage to the Nth charging stage, and the charging current value of each charging stage from the second charging stage to the Nth charging stage decreases in sequence, and the charging current value of the Nth charging stage is less than or equal to the preset current value, and the preset current value is determined according to the maximum allowable floating pressure and the internal resistance of the battery. Through this scheme, since the current value of each charging stage in the second charging stage to the Nth charging stage decreases in sequence, and the charging current value of the last constant current charging stage is less than or equal to the preset current value, and the preset current value is determined according to the maximum allowable floating pressure and the internal resistance of the battery, the floating pressure generated during charging will not be greater than the maximum allowable floating pressure, so that the generated floating pressure can be small, ensuring that the battery capacity can be used to the maximum extent, and improving the utilization rate of the battery.

[0051] Optionally, the power parameter may be a power percentage, or the power parameter may be a voltage value.

[0052] In the embodiment of the present invention, a possible implementation is: the charging stages can be divided according to the percentage of power. Optionally, the charging stages can be divided with reference to the specific method in the following power control method.

[0053] Another possible implementation is: the charging stages may be divided according to the voltage value. Optionally, the charging stages may be divided according to the specific method in the following voltage control method.

[0054] Optionally, the preset current value is determined according to the quotient of the maximum allowable floating pressure and the internal resistance of the battery.

[0055] When the quotient is a decimal, it can be rounded up.

[0056] Optionally, the value of N is determined according to the internal resistance of the battery and the maximum allowable internal resistance.

[0057] Optionally, the quotient of the internal resistance of the battery and the maximum allowable internal resistance is rounded up to obtain the value n, N=n+1.

[0058] Optionally, in the N charging stages, the charging current value in each charging stage decreases by the same amount.

[0059] Optionally, the charging current value decreases by an amount obtained according to the following formula:

[0060] A=(I max -I N) / (N-1);

[0061] Among them, A represents the decreasing amount of charging current value, I max Indicates the maximum charging current value, I N It indicates the charging current value of the Nth charging stage, and N indicates the total number of charging stages.

[0062] The principle of the charging method provided by the embodiment of the present invention is as follows:

[0063] The internal resistance of the battery is related to the battery volume. The larger the volume, the smaller the internal resistance. In actual testing, the internal resistance of the battery is related to the battery voltage. The higher the battery voltage, the greater the internal resistance of the battery. This is because the charging process of the battery is the overcharge in which positively charged lithium ions are transferred from the negative electrode to the positive electrode. When the battery voltage is high, the voltage of the negative electrode is close to 0. At this time, there are few lithium ions, which will increase the internal resistance of the transfer of lithium ions to the positive electrode.

[0064] According to Ohm's law, when charging a battery, it will inevitably generate floating pressure due to the internal resistance of the battery. The traditional charging method is to charge with a constant current first and then enter constant voltage charging. During the entire charging process, the battery is charged with the maximum charging current that the battery can withstand. Therefore, there is floating pressure in the battery during the entire charging process. This floating pressure will cause the charging to be terminated early. If the internal resistance of the battery is large, the battery will not be fully charged.

[0065] like Figure 1 The figure shows the charging curve of the traditional charging method. In the entire charging curve, constant current charging is performed first and then constant voltage charging is performed ( Figure 1 The two charging processes are separated by a dotted line in the figure). The entire charging process is carried out with the maximum charging current that the battery can withstand. If the internal resistance of the battery is large, there will be a charging false voltage throughout the process.

[0066] For example, if the battery internal resistance is 250 milliohms and the charging current is 500mA, the maximum floating pressure generated by the battery during charging is 0.25*0.5=0.125V. This floating pressure cannot be completely eliminated during the charging process because the entire charging process is charged with the maximum charging current that the battery can withstand.

[0067] In order to reduce the charging floating voltage, the present invention proposes a segmented constant current charging method, which can actively reduce the charging current through software control at appropriate times, that is, when the battery voltage is relatively high or the power is relatively large, so that the charging enters a small current constant current stage.

[0068] like Figure 2 The charging curve of the charging method provided by the embodiment of the present invention is shown, which can be called a segmented constant current charging method. Figure 2As shown in the figure, there are 5 charging stages, and the charging currents of the 5 charging stages decrease successively (the charging currents of each stage in the figure are represented as I1, I2, I3, I4, and I5). Each reduction in the charging current can reduce the floating pressure generated during charging, thereby achieving the purpose of charging the battery to the maximum extent.

[0069] like Figure 3 As shown, the charging method provided by the embodiment of the present invention includes:

[0070] 101. Determine the number of charging stages N.

[0071] In the embodiment of the present invention, the first charging stage among the N charging stages may be a stage of charging with a maximum charging current, and the second charging stage to the nth charging stage may be called a stage of segmented constant current.

[0072] Because the float pressure is closely related to the internal resistance of the battery, the internal resistance of the battery is used as the basis. Since the actual measured internal resistance of the battery within 50 milliohms has little effect on the float pressure, the internal resistance greater than 50 milliohms has a more obvious effect on the float pressure. Therefore, the quotient obtained by dividing the actual internal resistance value R of the battery by 50 milliohms is used to determine the number of segmented constant current n, N=n+1.

[0073] Among them, if the quotient obtained by dividing the actual internal resistance value R of the battery by 50 milliohms has a decimal, it shall be rounded up (that is, rounded up to 1).

[0074] For example, assuming that the internal resistance of the battery is 220 milliohms, divided by 50 milliohms, the value is 4.4, which is rounded up to 5. A 5-step constant current can be used, and the N value is 5.

[0075] 102. Determine the current in each stage.

[0076] According to actual debugging and testing experience, the voltage of the battery will drop after the actual charging is completed. Generally, the drop range will vary depending on the internal resistance of the battery, and the drop range may exceed 100mV in some cases. In actual testing, if the drop range is between 40mV and 50mV, then the battery is generally fully charged (a fully charged battery means that after charging is completed, the battery is discharged with a current of 0.2C, and the discharge time is not less than 5 hours).

[0077] Based on the above principle, in order to ensure that the battery is fully charged, a value less than 60mV can be selected as the maximum allowable floating pressure.

[0078] Optionally, less than 30mV-40mV may be selected as an acceptable floating voltage.

[0079] For example, 30mV is used as the maximum allowable floating voltage, and 30mV is divided by the battery internal resistance to obtain a preset current value, and the current value of the last charging stage can be less than or equal to the preset current value. Assuming that the battery internal resistance is 200 milliohms, the current I of the last charging stage is N 30mV divided by 200 milliohms gives 150mA. Determine the current I after the last constant current charging stage N After that, the maximum charging current I allowed by the battery max Subtract I N Divide by n to get the current value decrease A of each constant current. The current value of each stage in the segmented constant current stage (i.e., the 2nd to Nth charging stage) is I max -A*n.

[0080] For example, the internal resistance of a battery is 200 milliohms, and the maximum charging current is 800 mA, then the number of segmented constant current n=200 / 50=4, that is, there are 5 charging stages in total.

[0081] The current in the Nth charging stage is 0.03V / 0.2Ω=0.15A=150mA, so A=(800mA-150mA) / 4=162mA.

[0082] Then the currents in the five charging stages are:

[0083] I1=800mA;

[0084] I2=800mA-162mA*1=638mA;

[0085] I3=800mA-162mA*2=476mA;

[0086] I4 = 800mA - 162mA * 3 = 314mA;

[0087] I5=150mA.

[0088] After I1, I2, I3, I4 and I5 are calculated, the charging current corresponding to the corresponding charging stage can be controlled in the corresponding charging stage to perform charging.

[0089] 103. Set the gear according to the current of the actual charging chip, and select the current value closest to the determined segmented current for charging.

[0090] In the embodiment of the present invention, there are two specific methods for controlling the charging logic: the first is a power control method, which uses the power percentage as the basis for dividing the charging stages; the second is a voltage control method, which uses the voltage value as the basis for dividing the charging stages.

[0091] The two charging control logics are described below.

[0092] The first one: power control method.

[0093] When using the power control method for charging, it is required to set up a power meter in the terminal equipment, and its charging control system is as follows: Figure 4 As shown, it includes: a controller, a charging module, a fuel meter and a battery. The fuel meter and the charging module are both connected to the battery. The controller is connected to the fuel meter and the charging module. The controller can read the battery power information through the fuel meter to control the charging current of the charging module.

[0094] Specific control methods include:

[0095] 201. Use the traditional charging method to determine the percentage m% of electricity entering constant voltage charging.

[0096] For example, the following can be used: Figure 1 The charging method shown determines that the percentage of electricity m% that usually enters the constant voltage charging stage from the constant current charging stage. The percentage of electricity that usually enters the constant voltage charging stage is between 70% and 85%.

[0097] Optionally, in the embodiment of the present invention, m% can take any value between 70% and 85%.

[0098] 202. Determine the power percentage range and charging current value in each charging stage.

[0099] After m% is determined, the amount of electricity between (m%-10%)-94% can be divided into n sections, that is, the nth step is 94%-100%, which is the Nth charging stage.

[0100] Exemplarily, the power level is divided into N-1 equal parts from (m%-10%) to 94%, and the power level of each part is b. Assuming that the tested m%=80%, then n is 4, and the power level of each step is (94%-80%+10%) / 3=8%.

[0101] Then the control logic can be:

[0102] The first charging stage: when the battery power is 0%-70%, the charging current is 800mA;

[0103] The second charging stage: when the battery power is 70%-78%, the charging current is 638mA;

[0104] The third charging stage: when the battery power is 78%-87%, the charging current is 476mA;

[0105] The fourth charging stage: when the battery power is 87%-94%, the charging current is 314mA;

[0106] The fifth charging stage: when the battery power is 94%-100%, the charging current is 150mA.

[0107] The battery power percentage range and charging current value determined by the above method are only exemplary and can be adjusted according to actual needs.

[0108] By way of example, the following takes charging a phone watch using the above-mentioned charging method as an example to illustrate the actual charging effect that can be achieved by this method.

[0109] Assume that the rated capacity of the battery of the phone watch is 820mAh, the actual capacity of the battery is 840mAh, the internal resistance of the battery is between 170-200 milliohms, the rated voltage of the battery is 4.4V, and the maximum charging current is 800mA. Then, the last charging current is 30mV / 200 milliohms = 150mA. After testing, if the ordinary constant voltage and constant current charging method is used, when the battery power reaches about 80%, the battery changes from constant voltage to constant current. The m% here is 80%, and 70%-94% is divided into 3 stages, and the power increase in each stage is 8%.

[0110] The segmented electric current can be obtained as follows:

[0111] The first charging stage: when the battery power is 0%-70%, the charging current is 800Ma.

[0112] The second charging stage: When the battery power is 70%-78%, the charging current is 638mA. According to the unit of the charging chip, the actual value is 650mA.

[0113] The third charging stage: When the battery power is 78%-87%, the charging current is 476mA. According to the current gear of the charging chip, the actual value is 475mA.

[0114] The fourth charging stage: when the battery power is 87%-94%, the charging current is 314mA, and the actual value is 325mA.

[0115] The fifth charging stage: when the battery power is 94%-100%, the charging current is 150mA.

[0116] Taking the charging of the above-mentioned phone watch as an example, the charging curve can be obtained as follows: Figure 5 As shown, a fully charged battery can be tested with a battery tester. The test results are as follows: Figure 6 As shown, the amount of electricity discharged by the battery is: 831mAh, which reaches the rated capacity of the battery.

[0117] When the traditional charging method is used to charge the phone watch, the charging curve is as follows: Figure 7 The test results of the test power are shown as follows. Figure 8As shown, the amount of electricity discharged by the battery is: 781mAh.

[0118] from Figure 6 and Figure 8 It can be seen from the charging curve of the traditional charging method that after full charge, only about 781mAh of electricity is released, which is 50mAh less than 831mAh in the embodiment of the present invention. From the results obtained by actual implementation, it can be seen that the charging method provided by the embodiment of the present invention can increase the charging amount compared with the traditional charging method, so that the utilization rate of the battery is greatly improved.

[0119] The second method: voltage control method

[0120] In the voltage control method, it is not necessary to set up a fuel meter in the terminal equipment. The charging control system is as follows: Fig. 9 As shown, it includes a controller, a charging module and a battery, wherein the controller is connected to the battery and the charging module, and the charging module is connected to the battery. The controller has an analog-to-digital converter (ADC) interface that can read the battery voltage (usually all devices that need to be charged can support this function), and the controller can control the charging module to adjust the charging current.

[0121] 301. Use the traditional charging method to determine the voltage value a for entering constant voltage charging.

[0122] For example, the following can be used: Figure 1 The charging method shown determines the voltage value a which usually enters the constant voltage charging phase from the constant current charging phase.

[0123] After measuring a, take the rated voltage of the battery as b, and the last step is 30mV-40mV, here we take 40mV, then divide the power between a-(b-40mV) into n-1 segments, that is, the nth step is (b-40mV)-b, that is, the last charging stage is (b-40mV)-b.

[0124] Among them, the value of the last step is 30-40mV based on actual test experience. The normal voltage of a lithium battery drops back to 30-40mV after being fully charged.

[0125] 302. Determine the voltage range and charging current value of each charging stage.

[0126] After determining that the battery voltage is in the last charging stage (b-40mV)-b, the range of a-(b-40mV) can be divided into n-1 equal segments, and the width of each voltage segment is c.

[0127] For example, the tested value a=4.3V, the rated voltage of the battery b=4.45V, then n is equal to 4, which means it is divided into 5 charging stages. From the 2nd charging stage to the Nth charging stage, the voltage span of each charging stage is ((4.45-0.04)-4.3V) / 3≈0.04V.

[0128] Then the control logic can be:

[0129] The first charging stage: when the battery voltage is below 4.3V, the charging current is 800mA;

[0130] The second charging stage: when the battery voltage is 4.3-4.34V, the charging current is 638mA;

[0131] The third charging stage: when the battery voltage is 4.34-4.38, the charging current is 476mA;

[0132] The fourth charging stage: when the battery voltage is 4.38-4.41, the charging current is 314mA;

[0133] The fifth charging stage: when the battery voltage is 4.41-4.45, the charging current is 150mA.

[0134] It should be noted that the battery voltage value and charging current value calculated in the above method can be adjusted according to actual conditions.

[0135] The actual measured data of the voltage control method is close to that of the power control method, and both can achieve the effect of improving the utilization rate of the battery.

[0136] like Fig.10 As shown, an embodiment of the present invention provides a charging chip, the charging chip comprising:

[0137] A charging module 401, configured to charge the battery in N different charging stages using different charging currents, wherein the N different charging stages are divided according to a battery power parameter, and N is an integer greater than or equal to 2;

[0138] Among them, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and in the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a full state. The charging current value of each charging stage from the second charging stage to the Nth charging stage decreases successively, and the charging current value of the last constant current charging stage is less than or equal to the preset current value, and the preset current value is determined based on the maximum allowable floating pressure and the internal resistance of the battery.

[0139] Optionally, the preset current value is determined according to the quotient of the maximum allowable floating pressure and the internal resistance of the battery.

[0140] The value of N is determined based on the internal resistance of the battery and the maximum allowable internal resistance.

[0141] Optionally, in the N charging stages, the charging current value in each charging stage decreases by the same amount.

[0142] Optionally, the charging current value decreases by an amount obtained according to the following formula:

[0143] A=(I max -I N ) / (N-1);

[0144] Among them, A represents the decreasing amount of charging current value, I max Indicates the maximum charging current value, I N It indicates the charging current value of the Nth charging stage, and N indicates the total number of charging stages.

[0145] Optionally, the power parameter is a power percentage, or the power parameter is a voltage value.

[0146] An embodiment of the present invention further provides a terminal device, which includes the above-mentioned charging chip.

[0147] An embodiment of the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute part or all of the steps of the method in the above method embodiments.

[0148] An embodiment of the present invention further provides a computer program product, wherein when the computer program product runs on a computer, the computer is enabled to execute part or all of the steps of the methods in the above method embodiments.

[0149] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0150] The terminal device provided in the embodiment of the present invention can implement each process shown in the above method embodiment, and will not be described again here to avoid repetition.

[0151] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the above-mentioned processes does not mean the necessary order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0152] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0153] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0154] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several requests for a computer device (which can be a personal computer, a server or a network device, etc., specifically a processor in a computer device) to perform some or all of the steps of the above methods of various embodiments of the present invention.

[0155] A person skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electrically-erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

Claims

1. A charging method, characterized in that: include: N different charging stages, wherein the N different charging stages are divided according to a power parameter of a battery, and the N different charging stages use different charging currents to charge the battery, wherein N is an integer greater than or equal to 2, and the power parameter is used to characterize the power of the battery, and the power parameter is a power percentage; Wherein, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and the second charging stage to the Nth charging stage are stage of segmented constant current, and the battery is charged from the preset power parameter to a fully charged state in the second charging stage to the Nth charging stage, and the charging current value of each charging stage in the second charging stage to the Nth charging stage decreases in sequence, and the charging current value of the Nth charging stage is less than or equal to the preset current value, and the preset current value is determined according to the quotient of the maximum allowable floating pressure and the internal resistance of the battery; The value of N is determined according to the internal resistance of the battery and the maximum allowable internal resistance.

2. The method according to claim 1, characterized in that In the N charging stages, the charging current value in each charging stage decreases by the same amount.

3. The method according to claim 2, characterized in that The decreasing amount of the charging current value is obtained according to the following formula: A=(I max -I N ) / (N-1); Where A represents the decreasing amount of charging current, I max Indicates the maximum charging current value, I N represents the charging current of the Nth charging stage, and N represents the total number of charging stages.

4. A charging chip, characterized in that: include: A charging module, used for charging the battery with different charging currents in N different charging stages, wherein the N different charging stages are divided according to a power parameter of the battery, wherein N is an integer greater than or equal to 2, and the power parameter is used to characterize the power of the battery, and the power parameter is a power percentage; Wherein, in the first charging stage, the battery is charged to a preset power parameter with the maximum charging current value allowed by the battery, and the second charging stage to the Nth charging stage are stage of segmented constant current, and the battery is charged from the preset power parameter to a fully charged state in the second charging stage to the Nth charging stage, and the charging current value of each charging stage in the second charging stage to the Nth charging stage decreases in sequence, and the first current value of the charging current in the Nth charging stage is less than or equal to the preset current value, and the preset current value is determined according to the quotient of the maximum allowable floating pressure and the internal resistance of the battery; The value of N is determined according to the internal resistance of the battery and the maximum allowable internal resistance.

5. A terminal device, characterized in that: The terminal device includes the charging chip described in claim 4.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the charging method according to any one of claims 1 to 3 is implemented.

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