WO2021238198A1

WO2021238198A1 - Charging method, charging chip, and terminal device

Info

Publication number: WO2021238198A1
Application number: PCT/CN2020/140720
Authority: WO
Inventors: 余建明
Original assignee: 广东小天才科技有限公司
Priority date: 2020-05-27
Filing date: 2020-12-29
Publication date: 2021-12-02
Also published as: CN111525651A

Abstract

A charging method, a charging chip, and a terminal device, applied to the technical field of terminals, and capable of solving the problem of low battery utilization during charging. The method comprises: a battery is charged by using different charging currents at N different charging stages, the N different charging stages are divided according to electric quantity parameters of the battery, and N is an integer greater than or equal to 2; at the first charging stage, the battery is charged to a preset electric quantity parameter by using a maximum charging current value allowed by the battery; from the second charging stage to the Nth charging stage, the battery is charged from the preset electric quantity parameter to a fully charged state; the charging current values of the charging stages from the second charging stage to the Nth charging stage are sequentially decreased progressively; the charging current value of the Nth charging stage is smaller than or equal to a preset current value; the preset current value is determined by an allowable maximum floating voltage and internal resistance of the battery. The method is applied to a charging scene for the terminal device.

Description

Charging method, charging chip and terminal equipment

Technical field

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 technique

At present, wearable devices are becoming more and more miniaturized. The battery space in wearable devices is small, and it is difficult to increase the battery capacity. However, wearable devices are becoming more and more abundant and have more applications with high power consumption (for example, taking photos). , Video chat and video recording, etc.), making the endurance of wearable devices worse and worse, so the battery utilization should be maximized when charging.

Generally, the size of the battery 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. A 0.5A battery charge will produce a float voltage of 0.5*0.25=0.125V, which is equivalent to the maximum charging float voltage of 0.125V during the charging process. Although the current decreases during the subsequent constant voltage charging process, Floating pressure will be reduced, but it is also difficult to completely eliminate, so the battery utilization rate will be very low.

Summary of the invention

The embodiments of the present invention provide 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 embodiments of the present invention are implemented as follows:

In a first aspect, a charging method is provided. The method includes: N different charging stages, the N different charging stages are divided according to the power parameters of the battery, and the N different charging stages adopt different charging currents. The battery is charged, and the N is an integer greater than or equal to 2;

Wherein, the first charging stage uses the maximum allowable charging current value of the battery to charge to a preset power parameter, and from the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a fully charged state. 2 The charging current value of each charging stage from the charging stage to the Nth charging stage gradually decreases, and the charging current value of the Nth charging stage is less than or equal to a preset current value, and the preset current value is Determined according to the maximum allowable float voltage and the internal resistance of the battery.

Optionally, the method includes:

The preset current value is determined according to the quotient of the maximum allowable float voltage and the internal resistance of the battery.

Optionally, the method includes:

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

Optionally, in the N charging stages, the decrement amount of the charging current value in each charging stage is the same.

Optionally, the decrement amount of the charging current value is obtained according to the following formula:

A=(I _max -I _N )/(N-1);

Wherein, A represents the decrement of the charging current value, I _max represents 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.

Optionally, the power parameter is a percentage of power, or the power parameter is a voltage value.

In a second aspect, a charging chip is provided, including:

The charging module is used to charge the battery with different charging currents in N different charging stages, the N different charging stages are divided according to the power parameters of the battery, and the N is an integer greater than or equal to 2 ；

Wherein, the first charging stage uses the maximum allowable charging current value of the battery to charge to a preset power parameter, and from the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a fully charged state. 2 The charging current value of each charging stage from the charging stage to the Nth charging stage gradually decreases, and the charging current value of the Nth constant current charging stage is less than or equal to a preset current value, and the preset current The value is determined based on the maximum allowable float voltage and the internal resistance of the battery.

In a third aspect, a terminal device is provided, including the charging chip as in the second aspect.

In a fourth aspect, a computer-readable storage medium is provided, which stores a computer program that enables a computer to execute the charging method in the first aspect of the embodiments of the present invention or an optional implementation manner thereof. Among them, the computer-readable storage medium includes ROM/RAM, magnetic disk or optical disk, and so on.

In a fifth aspect, a computer program product is provided, which when the computer program product runs on a computer, causes the computer to execute the charging method in the first aspect or an optional implementation manner thereof.

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

In the embodiment of the present invention, the charging can be divided into 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 perform the charging on the battery. For charging, the N is an integer greater than or equal to 2; wherein, the first charging stage uses the maximum allowable charging current value of the battery to charge to a preset power parameter, and from the second charging stage to the Nth charging stage from the preset power The parameter is charged until the battery reaches a fully charged state, the charging current value of each charging stage from the second charging stage to the Nth charging stage decreases sequentially, and the first current of the charging current of the last constant current charging stage The value is less than or equal to a preset current value, and the preset current value is determined according to the maximum allowable float voltage and the internal resistance of the battery. Through this scheme, since the current value of each charging stage from the second charging stage to the Nth charging stage decreases sequentially, 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 , The preset current value is determined according to the maximum allowable float voltage and the internal resistance of the battery, so that the float voltage generated during charging will not be greater than the maximum allowable float voltage, so that the generated float voltage can be smaller, Ensure that the battery capacity can be used to the greatest extent and improve the utilization rate of the battery.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained from these drawings.

Fig. 1 is a schematic diagram 1 of a charging curve provided by an embodiment of the present invention;

Figure 2 is a second schematic diagram of a charging curve provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of a charging method provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram 1 of a charging control system provided by an embodiment of the present invention;

FIG. 5 is a third schematic diagram of a charging curve provided by an embodiment of the present invention;

6 is a schematic diagram 1 of a power detection provided by an embodiment of the present invention;

FIG. 7 is a fourth schematic diagram of a charging curve provided by an embodiment of the present invention;

FIG. 8 is a second schematic diagram of power detection according to an embodiment of the present invention;

FIG. 9 is a second schematic diagram of a charging control system provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a charging chip provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The terms "including" and "having" and any of their variations in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to clearly Those listed steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

It should be noted that in the embodiments of the present invention, words such as "exemplary" or "for example" are used as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

The embodiment of the present invention provides a charging method, a charging chip and a terminal device, which can improve the charging utilization rate.

The terminal device involved in the embodiment of the present invention may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle-mounted terminal device, a wearable device, an Ultra-Mobile Personal Computer (UMPC), a netbook, or a personal digital assistant (Personal Digital Assistant). Digital Assistant, PDA) and other electronic equipment. Among them, the wearable device may be a smart watch, a smart bracelet, a watch phone, a smart foot ring, a smart earring, a smart necklace, a smart earphone, etc., which are not limited in the embodiment of the present invention.

The charging method provided by the embodiment of the present invention is particularly suitable for terminal devices with a small battery capacity, for example, wearable devices.

Generally, the size of the battery 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. A 0.5A battery charge will produce a float voltage of 0.5*0.25=0.125V, which is equivalent to a maximum float voltage of 0.125V during the charging process, so it is difficult to fully charge the battery and the utilization rate is low.

Another disadvantage of a small battery capacity is that the cut-off current required to fully charge the battery is small. Generally, the charge cut-off current required to fully charge the battery is less than 0.2C. (C refers to the capacity of the battery). For example, an 800mAh battery requires a full cut-off current of 0.2C or 16mAh. There is basically no charging chip with such a small cut-off current on the market. At present, the cut-off current of universal charging chip charging on the market is generally above 50mA, which means that the cut-off condition required to be fully charged is not reached, so this will also cause the small-capacity battery to be unable to be fully charged.

In order to improve battery utilization, a charging chip with a small charge cut-off current is selected in the related technology, such as TI's BQ25618, and the cut-off battery can achieve 20-30mA. The disadvantage of this approach is that in the current platform solutions for wearable devices (such as phone watch solutions), phone watches generally have their own charging chip. If an additional charging chip is added, it will not only increase the cost of the product, but also take up There is space for phone watches, so this scheme is rarely applied. And the actual test found that even if the charging chip with a small cut-off current is used, the improvement of the battery utilization rate is still very limited, because the battery's internal resistance is large, and the floating voltage generated during charging is large, which will cause the battery to be charged quickly.

The charging method provided by the embodiment of the present invention can solve the above-mentioned existing problems and improve the utilization rate of the battery.

The execution subject of the charging method provided by 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. Specifically, it can be determined according to actual usage requirements. The embodiment is not limited. In the following, a terminal device is taken as an example to illustrate the charging method provided in the embodiment of the present invention.

The embodiment of the present invention provides a charging method including: N different charging stages, the N different charging stages are divided according to the battery capacity parameters, the N different charging stages use different charging currents to charge the battery, and N is greater than Or an integer equal to 2.

The above-mentioned power parameter is used to characterize the power of the battery.

Among them, the first charging stage uses the maximum allowable charging current value of the battery to charge to the preset power parameter, from the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter to the fully charged state, and the second charging stage is to the Nth charging stage. The charging current value of each charging stage in the charging stage gradually decreases, and the charging current value of the Nth charging charging stage is less than or equal to the preset current value, which is determined according to the maximum allowable float voltage and battery internal resistance .

In the embodiment of the present invention, it can be divided into N different charging stages for charging. 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 greater than or An integer equal to 2; among them, the first charging stage uses the maximum allowable charging current value of the battery to charge to the preset power parameter, and the second charging stage to the Nth charging stage is charged from the preset power parameter until the battery reaches a full state, and the second The charging current value of each charging stage from the charging stage to the Nth charging stage gradually decreases, 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 based on the maximum allowable float voltage and battery The internal resistance is determined. Through this scheme, since the 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 last constant current charging stage is less than or equal to the preset current value, the preset current The value is determined based on the maximum allowable float voltage and the internal resistance of the battery, so that the float voltage generated during charging will not be greater than the maximum allowable float voltage, which can make the generated float voltage smaller and ensure that the battery capacity can be used to the greatest extent. Improved battery utilization.

Optionally, the above-mentioned power parameter may be a percentage of power, or the above-mentioned power parameter may be a voltage value.

In the embodiment of the present invention, a possible implementation manner is that the charging stages can be divided according to the percentage of power. Optionally, the charging phase can be divided by referring to the specific method in the following power control method.

Another possible implementation is that the charging phase can be divided according to the voltage value. Optionally, the charging stage can be divided by referring to the specific method in the following voltage control method.

Optionally, the preset current value is determined according to the quotient of the maximum allowable float voltage and the internal resistance of the battery.

Among them, when the quotient has a decimal, it can be rounded up.

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

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

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

Optionally, the decrement of the charging current value is obtained according to the following formula:

A=(I _max -I _N )/(N-1);

Among them, A represents the decrement of the charging current value, I _max represents the maximum charging current value, I _N represents the charging current value of the Nth stroke stage, and N represents the total number of charging stages.

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

The internal resistance of the battery is related to the volume of the battery. The larger the volume, the smaller the internal resistance. In the actual test, the internal resistance of the battery has a certain relationship with the battery voltage. The higher the battery voltage, the greater the internal resistance of the battery. Because the charging process of the battery is the overcharge of positively charged lithium ions from the negative electrode to the positive electrode, the battery voltage is high. When the voltage of the negative electrode is close to 0, there are few lithium ions at this time, which will increase the internal resistance of lithium ions to the positive electrode.

According to Ohm’s law, the battery will inevitably produce a floating voltage during charging due to the internal resistance of the battery during charging. The traditional charging method is to first charge with constant current and then enter into constant voltage charging. During the entire charging process, the battery can withstand If the battery’s internal resistance is large, the battery cannot be fully charged if the battery’s internal resistance is too large.

Figure 1 shows the charging curve of the traditional charging method. In the entire charging curve, first constant current charging and then constant voltage charging (the two charging processes are separated by a dotted line in Figure 1), and the battery can withstand the whole process. The maximum charging current is used for charging. If the internal resistance of the battery is large, it will bring a charging virtual voltage throughout the process.

Exemplarily, if the internal resistance of the battery is 250 milliohms and the charging current is 500mA, the maximum floating voltage generated by the battery during the charging process is 0.25*0.5=0.125V. This floating voltage cannot be completely eliminated during the charging process, because the charging process is complete. It is charged with the maximum charging current that the battery can withstand.

In order to reduce the charging float voltage, the present invention proposes a segmented constant current charging method, which can actively reduce the charging current through software control when the battery voltage is relatively high or the battery power is relatively large, so that the charging enters a Constant current stage of small current.

Fig. 2 shows the charging curve of the charging method provided by the embodiment of the present invention, which can be referred to as a segmented constant current charging method. As shown in Figure 2, there are 5 charging stages, and the charging currents of the 5 charging stages are sequentially reduced (the charging current of each stage in the figure is represented as I ₁ , I ₂ , I ₃ , I ₄ , and I ₅ ) , Each time the charging current is reduced, the floating voltage generated during charging can be reduced, and the purpose of fully charging the battery can be achieved.

As shown in FIG. 3, the charging method provided by the embodiment of the present invention includes:

101. Determine the number of charging stages N.

In the embodiment of the present invention, the first charging stage of the N charging stages may be a stage for charging with a maximum charging current, and the second charging stage to the nth charging stage may be referred to as a segmented constant current stage.

Because the float voltage has a great relationship with the internal resistance of the battery, it is based on the internal resistance of the battery. Since the actual measured internal resistance of the battery within 50 milliohms has little effect on the float voltage, the internal resistance greater than 50 milliohms will affect the float voltage. It is more obvious, so the quotient obtained by dividing the battery's actual internal resistance R by 50 milliohms determines the number of segmented constant currents n, N=n+1.

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

Exemplarily, suppose that the internal resistance of the battery is 220 milliohms, divided by 50 milliohms to get 4.4, and rounded by 1 to 5, 5 times of segmented constant current can be used, and the value of N is 5.

102. Determine the current at each stage.

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

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.

Optionally, a float voltage of less than 30mV-40mV can be selected as an acceptable float voltage.

Exemplarily, 30 mV is used as the maximum allowable floating pressure, and 30 mV is divided by the internal resistance of the battery to obtain the preset current value, and the current value of the last charging stage may be less than or equal to the preset current value. Assuming that the internal resistance of the battery is 200 milliohms, the current I _{N in} the last charging stage is 30mV divided by 200 milliohms to obtain 150mA. After completing the final determination stage constant current charging current I _N, the maximum allowable battery charging current I _max is divided by n I _N obtained by subtracting the current value of each decrement constant A, constant phase segment (i.e. The current value of each stage from 2 to Nth charging stage) is I _max -A*n.

Exemplarily, if the internal resistance of a battery is 200 milliohms and the maximum charging current is 800 mA, the number of segmented constant currents is n=200/50=4, that is, there are 5 charging stages in total.

Among them, the current in the Nth charging stage is 0.03V/0.2 ohm=0.15A=150mA, then A=(800mA-150mA)/4=162mA.

Then the currents of the 5 charging stages are:

I ₁ ＝800mA;

I ₂ ＝800mA-162mA*1＝638mA;

I ₃ ＝800mA-162mA*2＝476mA;

I ₄ ＝800mA-162mA*3＝314mA;

I ₅ =150mA.

After calculating I ₁ , I ₂ , I ₃ , I ₄ and I ₅ , the corresponding charging current of the corresponding charging stage can be controlled to perform charging.

103. Set the gear according to the current of the actual charging chip, and select the current value closest to the determined segment current for charging.

In the embodiment of the present invention, there are two specific methods for controlling the charging logic: the first power control method, that is, the percentage of power is used as the basis for dividing the charging stages; the second is the voltage control method, that is, the voltage value is used as the basis for dividing charging. Basis for the stage.

The two types of charging control logic will be described separately below.

The first type: power control method.

When using the electric quantity control method for charging, it is required to install a fuel gauge in the terminal equipment. The charging control system is shown in Figure 4, which includes: a controller, a charging module, a fuel gauge and a battery, and the fuel gauge and charging module are all connected to the battery , The controller is connected to the fuel gauge and the charging module, and the controller can read the battery power information through the fuel gauge to control the charging current of the charging module.

Specific control methods include:

201. Determine the percentage m% of the electricity entering the constant voltage charging using a traditional charging method.

Exemplarily, the charging method as shown in FIG. 1 can be used to determine the electric quantity percentage m% that usually enters the constant voltage charging stage from the constant current charging stage. Usually, the percentage of electricity entering constant voltage charging is between 70% and 85%.

Optionally, in this embodiment of the present invention, m% can take any value from 70% to 85%.

202. Determine the power percentage range of each charging stage and the charging current value.

After determining m%, the power between (m%-10%) and 94% can be divided into n segments, that is, the nth step is 94%-100%, which is regarded as the Nth charging stage.

Exemplarily, use the (m%-10%)-94% segment of electricity to divide the N-1 segment equally, and get the value of each segment of electricity as b. Assuming that the tested m%=80%, then n is equal to 4, then every The power of each step is (94%-80%+10%)/3=8%.

Then the control logic can be:

The first charging stage: when the battery capacity is 0%-70%, the charging current is 800mA;

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

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

The fourth charging stage: When the battery power is 87%-94%, the charging current is 314mA;

The fifth charging stage: When the battery capacity is 94%-100%, the charging current is 150mA.

The battery power percentage range and the charging current value determined by the above method are only exemplary descriptions, and can be adjusted according to requirements in practice.

Exemplarily, the following uses the above charging method to charge a phone and watch as an example to illustrate the charging effect that the method can actually achieve.

Assume that the rated battery capacity of the phone watch is 820mAh, the actual battery capacity 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 capacity reaches about 80%, the battery will be converted from constant voltage to constant current. The value of m% is 80%, then 70%-94% is divided into 3 stages, and the increase in electricity in each stage is 8%.

The electric current of the segment can be obtained as follows:

The first charging stage: when the battery capacity is 0%-70%, the charging current is 800Ma.

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.

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.

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

Taking the above-mentioned phone watch charging as an example, the obtained charging curve can be shown in Figure 5, and the full battery can be tested with a battery tester. The test result is shown in Figure 6, showing that the battery discharged power is: 831mAh, reaching The rated capacity of the battery.

The traditional charging method is used to charge the phone and watch, and the obtained charging curve is shown in Figure 7. The test result of the test power is shown in Figure 8, which shows that the power discharged by the battery is: 781mAh.

It can be seen from Fig. 6 and Fig. 8 that the charging curve of the traditional charging method only discharges about 781 mAh after being fully charged, which is 50 mAh less than the 831 mAh in the embodiment of the present invention. It can be known from the results obtained in actual implementation that the charging method provided by the embodiment of the present invention can increase the charging capacity compared with the traditional charging method, so that the utilization rate of the battery is greatly improved.

The second type: voltage control method

In the voltage control method, there is no need to set a fuel gauge in the terminal equipment. The charging control system is shown in Figure 9, including a controller, a charging module, and a battery. The controller is connected to the battery and the charging module, and the charging module is connected to the battery, and the controller With an analog-to-digital converter (ADC) interface, the battery voltage can be read (usually devices that need to be charged can support this function), and the controller can control the charging module to adjust the charging current.

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

Exemplarily, the charging method shown in FIG. 1 may be used to determine the voltage value a that usually enters the constant voltage charging stage from the constant current charging stage.

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

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

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

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

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

Then the control logic can be:

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

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

The third charging stage: When the battery voltage is 4.34-4.38, the charging current is 476mA;

The fourth charging stage: When the battery voltage is 4.38-4.41, the charging current is 314mA;

The fifth charging stage: When the battery voltage is 4.41-4.45, the charging current is 150mA.

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

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

As shown in FIG. 10, an embodiment of the present invention provides a charging chip, and the charging chip includes:

The charging module 401 is used for charging N different charging stages with different charging currents, the N different charging stages are divided according to the battery capacity parameters, and N is an integer greater than or equal to 2;

Among them, the first charging stage uses the maximum allowable charging current value of the battery to charge to the preset power parameter, from the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter to the fully charged state, and the second charging stage is to the Nth charging stage. The charging current value of each charging stage in the charging stage gradually decreases, and the charging current value of the last constant current charging stage is less than or equal to the preset current value, which is determined according to the maximum allowable float voltage and battery internal resistance of.

A=(I _max -I _N )/(N-1);

The embodiment of the present invention also provides a terminal device, which includes the above-mentioned charging chip.

The embodiment of the present invention provides a computer-readable storage medium that stores a computer program, where the computer program causes a computer to execute part or all of the steps of the method in the above method embodiments.

The embodiment of the present invention also provides a computer program product, wherein when the computer program product runs on a computer, the computer is caused to execute part or all of the steps of the method in the above method embodiments.

It should be understood that the “one embodiment” or “an embodiment” mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification do 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 know that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily required by the present invention.

The terminal device provided in the embodiment of the present invention can implement each process shown in the foregoing method embodiment, and to avoid repetition, details are not described herein again.

In the various embodiments of the present invention, it should be understood that the size of the sequence numbers of the above processes does not mean the necessary sequence of execution. The execution order of each process should be determined by its function and internal logic, and should not be implemented in the present invention. The implementation process of the example constitutes any limitation.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

If the aforementioned 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 essence of the technical solution of the present invention, or the part that contributes to the existing technology, or all or part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a memory. , Including several requests to make a computer device (which may be a personal computer, a server or a network device, etc., specifically a processor in a computer device) execute part or all of the steps of the above methods of the various embodiments of the present invention.

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

Claims

A charging method, characterized in that it comprises:

N different charging stages, the N different charging stages are divided according to the battery capacity parameters, the N different charging stages use different charging currents to charge the battery, and the N is greater than or equal to 2 Integer

Wherein, the first charging stage uses the maximum allowable charging current value of the battery to charge to a preset power parameter, and from the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a fully charged state. 2 The charging current value of each charging stage from the charging stage to the Nth charging stage gradually decreases, and the charging current value of the Nth charging stage is less than or equal to a preset current value, and the preset current value is based on The maximum allowable float voltage is determined by the internal resistance of the battery.
The method of claim 1, wherein:

The preset current value is determined according to the quotient of the maximum allowable float voltage and the internal resistance of the battery.
The method of claim 1, wherein:

The value of N is determined according to the internal resistance of the battery and the maximum allowable internal resistance.
The method according to claim 1, characterized in that, in the N charging stages, the charging current value of each charging stage decreases by the same amount.
The method according to claim 4, wherein the decrement amount of the charging current value is obtained according to the following formula:

A=(I max -I N )/(N-1);

Wherein, A represents the decrement of the charging current value, I max represents 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.
The method according to any one of claims 1 to 5, wherein the power parameter is a percentage of power, or the power parameter is a voltage value.
A charging chip, characterized in that it comprises:

The charging module is used to charge the battery with different charging currents in N different charging stages, the N different charging stages are divided according to the power parameters of the battery, and the N is an integer greater than or equal to 2;

Wherein, the first charging stage uses the maximum allowable charging current value of the battery to charge to a preset power parameter, and from the second charging stage to the Nth charging stage, the battery is charged from the preset power parameter until the battery reaches a fully charged state. 2 The charging current value of each charging stage from the charging stage to the Nth charging stage gradually decreases, and the first current value of the charging current of the Nth charging stage is less than or equal to a preset current value, and the preset The current value is determined according to the maximum allowable float voltage and the internal resistance of the battery.
8. The charging chip according to claim 7, comprising: the preset current value is determined according to the quotient of the maximum allowable float voltage and the internal resistance of the battery.
A terminal device, characterized in that the charging device comprises the charging chip according to claim 7 or 8.
A computer storage medium, wherein a computer program is stored in the computer storage medium, and when the computer program runs, the charging method according to any one of claims 1 to 6 is implemented.