CN111525651A - Charging method, charging chip and terminal equipment - Google Patents
Charging method, charging chip and terminal equipment Download PDFInfo
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- CN111525651A CN111525651A CN202010464756.7A CN202010464756A CN111525651A CN 111525651 A CN111525651 A CN 111525651A CN 202010464756 A CN202010464756 A CN 202010464756A CN 111525651 A CN111525651 A CN 111525651A
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- 238000007600 charging Methods 0.000 title claims abstract description 367
- 238000000034 method Methods 0.000 title claims abstract description 102
- 230000003247 decreasing effect Effects 0.000 claims abstract description 12
- 238000004590 computer program Methods 0.000 claims description 8
- 238000010277 constant-current charging Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- 238000010280 constant potential charging Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The embodiment of the invention discloses a charging method, a charging chip and terminal equipment, which are applied to the technical field of terminals and can solve the problem of low battery utilization rate during charging. The method comprises the following steps: the battery is charged by adopting different charging currents in N different charging stages, the N different charging stages are divided according to the electric quantity parameters of the battery, and N is an integer greater than or equal to 2; the charging method comprises the following steps that the 1 st charging stage is charged to a preset electric quantity parameter by using the maximum allowable charging current value of a battery, the charging is carried out from the preset electric quantity parameter to the battery reaching a full-charge state in the 2 nd charging stage to the Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is gradually decreased, the charging current value of the Nth charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the allowable maximum floating voltage and the internal resistance of the battery. The method is applied to the scene of terminal equipment charging.
Description
Technical Field
The embodiment of the invention relates to the technical field of terminals, in particular to a charging method, a charging chip and terminal equipment.
Background
At present, wearable equipment is more and more miniaturized, and battery space is less in the wearable equipment, and battery capacity hardly improves, but wearable equipment's function is more and more abundant, and possess the application function of more big consumption (for example, take a picture, video chat and record video etc.) for wearable equipment's duration is more and more poor, consequently will improve the utilization ratio of battery when charging as far as possible.
Generally, the battery of the wearable device has a small volume, so that the internal resistance of the battery is large, the internal resistance of a small battery within 1000mAh in an actual product reaches more than 250 milliohms, and the large internal resistance of the battery can cause floating voltage during charging, for example, when the battery is charged by a 0.5A battery, the floating voltage of 0.5 × 0.25 — 0.125V can be generated, which is equivalent to that the maximum charging floating voltage in the charging process can reach 0.125V, although the floating voltage can be reduced along with the reduction of current in the subsequent constant-voltage charging process, the floating voltage cannot be completely eliminated, and thus, the battery utilization rate can be very low.
Disclosure of Invention
The embodiment of the invention provides a charging method, a charging chip and terminal equipment, which are used for solving the problem of low utilization rate of a battery in the prior art. In order to solve the above technical problem, the embodiment of the present invention is implemented as follows:
in a first aspect, a charging method is provided, which includes: the charging method comprises the following steps that N different charging stages are divided according to electric quantity parameters of a battery, the N different charging stages adopt different charging currents to charge the battery, and N is an integer greater than or equal to 2;
the method comprises the following steps that a 1 st charging stage charges the battery to a preset electric quantity parameter according to a maximum allowable charging current value of the battery, the battery is charged to a full state from the preset electric quantity parameter in a 2 nd charging stage to an Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is gradually decreased, the charging current value of the Nth charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the maximum allowable floating voltage and the internal resistance of the battery.
Optionally, the method includes:
the preset current value is determined according to the quotient of the allowed maximum floating pressure and the internal resistance of the battery.
Optionally, the method includes:
and the value of N is determined according to the internal resistance of the battery and the allowed maximum internal resistance.
Optionally, in the N charging phases, the decrement of the charging current value of each charging phase is the same.
Optionally, the charge current value increment is obtained according to the following formula:
A＝(Imax-IN)/(N-1)；
wherein A represents the increment of the charging current value, ImaxRepresents the maximum charging current value INRepresents the charging current of the Nth charging phase, and N represents the total number of charging phases.
Optionally, the electric quantity parameter is an electric quantity percentage, or the electric quantity parameter is a voltage value.
In a second aspect, a charging chip is provided, including:
the charging module is used for charging the battery by adopting different charging currents in N different charging stages, the N different charging stages are divided according to the electric quantity parameter of the battery, and N is an integer greater than or equal to 2;
the charging method comprises the following steps that a 1 st charging stage charges the battery to a preset electric quantity parameter according to a maximum charging current value allowed by the battery, the battery is charged to a full state from the preset electric quantity parameter in a 2 nd charging stage to an Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is gradually decreased, the charging current value of the Nth constant current charging stage is smaller than or equal to a preset current value, and the preset current value is determined according to the maximum allowable floating voltage and the internal resistance of the battery.
In a third aspect, a terminal device is provided, which includes the charging chip as in the second aspect.
In a fourth aspect, a computer-readable storage medium is provided, which stores a computer program, where the computer program makes a computer execute the charging method in the first aspect or the optional implementation manner of the embodiment of the present invention. The computer readable storage medium includes ROM/RAM, magnetic disk or optical disk, etc.
In a fifth aspect, a computer program product is provided, which when run on a computer causes the computer to perform the charging method of the first aspect or an alternative implementation thereof.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the charging can be performed by dividing into N different charging stages, wherein the N different charging stages are divided according to the electric quantity parameter of the battery, the N different charging stages charge the battery by adopting different charging currents, and N is an integer greater than or equal to 2; the method comprises the following steps that a 1 st charging stage charges the battery to a preset electric quantity parameter according to a maximum allowable charging current value of the battery, the battery is charged to a full state from the preset electric quantity parameter in a 2 nd charging stage to an Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is sequentially decreased progressively, the first current value of the charging current of the last constant current charging stage is smaller than or equal to a preset current value, and the preset current value is determined according to the maximum allowable floating voltage and the internal resistance of the battery. According to the scheme, the current value of each charging stage from the 2 nd charging stage to the Nth charging stage is sequentially decreased, the first current value of the charging current of the last constant-current charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the allowed maximum floating pressure and the internal resistance of the battery, so that the floating pressure generated during charging is not larger than the allowed maximum floating pressure, the generated floating pressure is smaller, the capacity of the battery can be utilized to the maximum degree, and the utilization rate of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic diagram of a charging curve according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a charging curve according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a charging method according to an embodiment of the present invention;
fig. 4 is a first schematic diagram of a charging control system according to an embodiment of the present invention;
fig. 5 is a third schematic diagram of a charging curve according to an embodiment of the present invention;
fig. 6 is a first schematic diagram of power detection according to an embodiment of the present invention;
fig. 7 is a fourth schematic view of a charging curve according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a second exemplary embodiment of power detection;
fig. 9 is a schematic diagram of a charging control system according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a charging chip according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
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 explanations. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
The embodiment of the invention provides a charging method, a charging chip and terminal equipment, which can improve the charging utilization rate.
The terminal device according to the embodiment of the present invention may be an electronic device such as 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 (PDA). 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 headset, or the like, and the embodiment of the present invention is not limited.
The charging method provided by the embodiment of the invention is particularly suitable for terminal equipment with smaller battery capacity, such as wearable equipment.
At present, wearable equipment is more and more miniaturized, and battery space is less in the wearable equipment, and battery capacity hardly improves, but wearable equipment's function is more and more abundant, and possess the application function of more big consumption (for example, take a picture, video chat and record video etc.) for wearable equipment's duration is more and more poor, consequently will improve the utilization ratio of battery when charging as far as possible.
Generally, the battery of the wearable device has a small volume, so that the internal resistance of the battery is large, the internal resistance of a small battery within 1000mAh in an actual product reaches more than 250 milliohms, and the large internal resistance of the battery can cause the floating voltage of the battery during charging, for example, when the battery is charged by 0.5A, the floating voltage of 0.5 × 0.25 — 0.125V can be generated, which is equivalent to that the maximum floating voltage reaches 0.125V during charging, so that the battery is difficult to be fully charged, and the utilization rate is low.
Another disadvantage of small battery capacity is that the cutoff current required to fully charge the battery is small, and batteries typically require a cutoff current of less than 0.2C to fully charge the battery. (C refers to the capacity of the battery). For example, 800mAh battery, requires full cutoff current of 0.2C, i.e. 16mAh, and there are no charging chips with such small cutoff current in the market. The cut-off current of the charging of the general charging chip on the market is generally more than 50mA, namely, the cut-off condition of full charging is not achieved, so that the small-capacity battery cannot be fully charged.
In order to improve the utilization rate of the battery, a charging chip with small charging cut-off current is selected in the related art, for example, the BQ25618 of TI is selected, and the cut-off current of the battery can be 20-30 mA. The disadvantage of this method is that in the platform solution of the wearable device (such as the solution of the phone watch), the phone watch generally has its own charging chip, if a charging chip is additionally added, not only the cost of the product is increased, but also the space of the phone watch is occupied, so this solution is rarely used. In addition, practical tests show that even if a charging chip with small cut-off current is used, the improvement of the utilization rate of the battery is limited, and the battery can be quickly cut off due to the fact that the floating pressure generated when the battery is charged with large internal resistance is large.
The charging method provided by the embodiment of the invention can solve the existing problems and improve the utilization rate of the battery.
The execution main body of the charging method provided by the embodiment of the present invention may be the terminal device, or may also be a functional module and/or a functional entity capable of implementing the charging method in the terminal device, which may be specifically determined according to actual use requirements, and the embodiment of the present invention is not limited. The following takes a terminal device as an example to exemplarily explain the charging method provided by the embodiment of the present invention.
The embodiment of the invention provides a charging method, which comprises the following steps: the charging method comprises the following steps of N different charging stages, wherein the N different charging stages are divided according to electric quantity parameters of the battery, the N different charging stages adopt different charging currents to charge the battery, and N is an integer greater than or equal to 2.
The electric quantity parameter is used for representing the electric quantity of the battery.
The charging method comprises the following steps that the 1 st charging stage is charged to a preset electric quantity parameter by using the maximum allowable charging current value of a battery, the charging is carried out from the preset electric quantity parameter to the battery reaching a full-charge state in the 2 nd charging stage to the Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is gradually decreased, the charging current value of the Nth charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the allowable maximum floating voltage and the internal resistance of the battery.
In the embodiment of the invention, the charging can be carried out by dividing into N different charging stages, wherein the N different charging stages are divided according to the electric quantity parameters of the battery, the N different charging stages adopt different charging currents to charge the battery, and N is an integer greater than or equal to 2; the charging method comprises the following steps that the 1 st charging stage is charged to a preset electric quantity parameter by using the maximum allowable charging current value of the battery, the charging is carried out from the preset electric quantity parameter to the battery reaching a full-charge state in the 2 nd charging stage to the Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is sequentially decreased, the charging current value of the Nth charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the allowable maximum floating voltage and the internal resistance of the battery. According to the scheme, the current value of each charging stage from the 2 nd charging stage to the Nth charging stage is sequentially decreased, the charging current value of the last constant-current charging stage is smaller than or equal to the preset current value, the preset current value is determined according to the allowed maximum floating pressure and the internal resistance of the battery, so that the floating pressure generated during charging is not larger than the allowed maximum floating pressure, the generated floating pressure can be smaller, the capacity of the battery can be utilized to the maximum degree, and the utilization rate of the battery is improved.
Optionally, the electric quantity parameter may be an electric quantity percentage, or the electric quantity parameter may be a voltage value.
In the embodiment of the present invention, one possible implementation manner is: the charging phases may be divided according to charge percentage. Alternatively, the charging phase may be divided with reference to a specific method in the following electricity amount control method.
Another possible implementation is: the charging phases may be divided according to voltage values. Alternatively, the charging phase may be divided with reference to a specific method in the following voltage control method.
Optionally, the preset current value is determined according to a quotient of the maximum allowable float voltage and the internal resistance of the battery.
Where, when there is a decimal, rounding up may be performed.
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 the value N, where N is N + 1.
Optionally, in the N charging phases, the decrement of the charging current value in each charging phase is the same.
Alternatively, the charge current value increment amount is obtained according to the following formula:
A＝(Imax-IN)/(N-1)；
wherein A represents the increment and decrement of the charging current value, ImaxDenotes the maximum charging current value, INThe charging current value of the Nth pulse stage is shown, and N represents the total charging stage number.
The principle of the charging method provided by the embodiment of the invention is as follows:
the internal resistance of the battery is related to the volume of the battery, and the larger the volume is, the smaller the internal resistance is. In an actual test, the internal resistance of the battery has a certain relation with the voltage of the battery, the higher the voltage of the battery, the larger the internal resistance of the battery is, because the charging process of the battery is the overcharge of the lithium ions with positive charges transferred from the negative electrode to the positive electrode, when the voltage of the battery is high, the voltage of the negative electrode is close to 0, and at the moment, the lithium ions are few, so that the internal resistance of the lithium ions transferred to the positive electrode is increased.
According to ohm's law, the battery inevitably generates floating voltage during charging due to internal resistance of the battery, the traditional charging mode is constant-current charging and then constant-voltage charging, the maximum charging current which can be borne by the battery is used for charging in the whole charging process, so that the battery has floating voltage in the whole charging process, the floating voltage can lead to the early cut-off of charging, and if the internal resistance of the battery is very large, the battery cannot be fully charged.
As shown in fig. 1, a charging curve of a conventional charging method is obtained, in the entire charging curve, constant-current charging is performed first, and then constant-voltage charging is performed (two charging processes are separated by a dotted line in fig. 1), and charging is performed with the maximum charging current that can be borne by the battery in the whole process, and if the internal resistance of the battery is large, a virtual charging voltage is carried in the whole process.
For example, when 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, and the floating voltage cannot be completely eliminated during the charging process because the charging process is performed at the maximum charging current that the battery can bear during the whole charging process.
In order to reduce the charging floating voltage, the invention provides a segmented constant current charging mode, and the charging current can be actively reduced through software control when the battery voltage is relatively high or the electric quantity is relatively large, so that the charging enters a low-current constant current stage.
Fig. 2 shows a charging curve of the charging method according to the embodiment of the present invention, which may be referred to as a segmented constant current charging method. As shown in fig. 2, 5 charging phases are included, and the charging current of the 5 charging phases is sequentially decreased (the charging current of each phase is represented as I in the figure)1、I2、I3、I4And I5) The floating voltage generated during charging can be reduced by reducing the charging current each time, and the aim of fully charging the battery to the maximum extent is further achieved.
As shown in fig. 3, the charging method provided in the embodiment of the present invention includes:
101. the number of charging phases N is determined.
In the embodiment of the present invention, the first charging stage of the N charging stages may be a stage in which charging is performed with a maximum charging current, and the 2 nd to nth charging stages may be referred to as stages of segmented constant current.
Because the relation between the floating voltage and the internal resistance of the battery is large, the internal resistance of the battery is taken as the basis, the influence of the internal resistance of the battery within 50 milliohms on the floating voltage is small when actually measured, and the influence of the internal resistance of the battery greater than 50 milliohms on the floating voltage is obvious, so the quotient obtained by dividing the actual internal resistance R of the battery by 50 milliohms determines the number N of the segmented constant current, wherein the N is N + 1.
The quotient of the actual internal resistance value R of the battery divided by 50 milliohms is a decimal number that is rounded up uniformly (i.e., rounded up by 1).
For example, assuming that the internal resistance of the battery is 220 milliohms, 4.4 is obtained by dividing 50 milliohms, and 5 is obtained by rounding 1, 5-time segmented constant current can be adopted, and the value of N is 5.
102. The current for each phase is determined.
According to the practical debugging and testing experience, the voltage can fall back after the actual charging of the battery is finished, the falling amplitude can be different according to different internal resistances of the battery under the common condition, and the falling amplitude can exceed 100mV under some conditions. In practical tests, if the falling amplitude is between 40mV and 50mV, the battery is generally in a full state (the full state of the battery means that the battery is discharged by using a current of 0.2C after the charging is finished, 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 may be selected as the maximum allowable floating voltage.
Alternatively, a float pressure of less than 30mV to 40mV may be selected as an acceptable float pressure.
For example, using 30mV as the maximum allowable floating voltage, dividing the internal resistance of the battery by 30mV may result in a preset current value, and the current value of the last charging phase 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 of the last charging stageN30mV divided by 200 mOhm gave 150 mA. Determining the current I of the last constant current charging stageNThen, the maximum charging current I allowed by the battery is usedmaxSubtract INDividing by N to obtain a current value increment A of each constant current, wherein the current value of each stage in the stages of the sectional constant current (i.e. the 2 nd to the Nth charging stages) is Imax-A*n。
For example, the internal resistance of one battery is 200 milliohms, the maximum charging current is 800mA, and the number of segmented constant currents n is 200/50 is 4, that is, there are 5 charging stages in total.
Wherein, the current in the Nth charging stage is 0.03V/0.2 ohm-0.15A-150 mA, and A-800 mA-150 mA/4-162 mA.
Then the currents for the 5 charging phases are:
I1＝800mA；
I2＝800mA-162mA*1＝638mA；
I3＝800mA-162mA*2＝476mA；
I4＝800mA-162mA*3＝314mA；
I5＝150mA。
calculate I1、I2、I3、I4And I5After that, the charging current corresponding to the corresponding stage may be controlled in the corresponding charging stage to perform charging.
103. And setting a gear according to the current of the actual charging chip, and selecting a current value closest to the determined segmented current for charging.
In the embodiment of the present invention, there are two specific methods for controlling the charging logic: the first electric quantity control method is that the percentage of electric quantity is used as the basis for dividing charging stages; the second method is a voltage control method, in which the voltage value is used as the basis for dividing the charging phase.
Two kinds of logic for controlling charging are explained below.
The first method comprises the following steps: and (4) electric quantity control method.
When the terminal device is charged by using the electric quantity control method, it is required to set an electricity meter in the terminal device, and a charging control system of the terminal device is shown in fig. 4, which includes: the controller can read the electric quantity information of the battery through the electricity meter so as to control the charging current of the charging module.
The specific control method comprises the following steps:
201. the percentage m% of the charge entering the constant voltage charging is determined by the conventional charging method.
For example, the charging method shown in fig. 1 may be used to determine the percentage m% of the charge that normally enters the constant voltage charging phase from the constant current charging phase. Typically the percentage of charge entering the constant voltage charge is between 70% and 85%.
Optionally, in the embodiment of the present invention, m% may take any value from 70% to 85%.
202. The percentage charge range for each charging phase is determined, as well as the charging current value.
After m% is determined, the amount of electricity between (m% -10%) -94% can be divided into N segments, i.e. the nth step is 94% -100%, as the nth charging phase.
Illustratively, an N-1 division is performed with a capacity of (m% -10%) -94% to obtain a capacity value of b for each division, and assuming that m% tested equals 80%, N equals 4, the capacity for each division is (94% -80% + 10%)/3 equals 8%.
The control logic may be:
1 st charging phase: when the electric quantity of the battery is 0% -70%, the charging current is 800 mA;
the 2 nd charging phase: when the battery capacity is 70% -78%, 638mA is used for charging current;
the 3 rd charging phase: when the battery capacity is 78% -87%, 476mA is used for charging current;
4 th charging phase: when the battery capacity is 87% -94%, 314mA is used for charging current;
the 5 th charging phase: when the battery capacity is 94% -100%, the charging current is 150 mA.
The percentage range of the battery capacity and the charging current value determined by the above method are only exemplary illustrations, and can be adjusted according to the requirement in practice.
For example, the charging method described above is used to charge a telephone watch, and the charging effect actually achieved by the method is described below.
Suppose that the rated capacity of the battery of the telephone watch is 820mAh, the actual capacity of the battery is 840mAh, the internal resistance of the battery is 170-200 milliohms, the rated voltage of the battery is 4.4V, and the maximum charging current is 800 mA. And testing, wherein the last charging current is 30mV/200 mOhm is 150mA, and if a common constant voltage and constant current charging method is used, when the electric quantity of the battery reaches about 80%, the battery is converted from constant voltage to constant current, and m% in the battery takes 80%, and 70% -94% is divided into 3 sections, so that the electric quantity increase of each section is 8%.
The segmented charge current can be derived as follows:
1, charging stage: when the battery capacity is 0% -70%, the charging current is 800 Ma.
And 2, a charging stage: when the battery capacity is 70% -78%, the charging current takes 650mA actually according to the unit of the charging chip by 638 mA.
And 3, a charging stage: when the battery electric quantity is 78% -87%, the charging current uses 476mA, and the actual value is 475mA according to the current gear of the charging chip.
And 4, a charging stage: when the battery electric quantity is 87% -94%, 314mA is used for charging current, and the actual value is 325 mA.
And 5, a charging stage: when the battery capacity is 94% -100%, the charging current is 150 mA.
Taking the charging of the telephone watch as an example, the obtained charging curve can be as shown in fig. 5, the fully charged battery can be tested by the battery comprehensive tester, the test result is as shown in fig. 6, and the electric quantity discharged by the battery is shown as follows: 831mAh, the rated capacity of the battery is reached.
The charging curve obtained by charging the telephone watch in the conventional charging manner is shown in fig. 7. The test result of the test electric quantity is shown in fig. 8, and shows that the electric quantity discharged by the battery is: 781 mAh.
As can be seen from fig. 6 and 8, the charging curve of the conventional charging method only discharges about 781mAh after being fully charged, which is 50mAh less than 831mAh in the embodiment of the present invention. The result obtained by actual implementation shows that compared with the conventional charging method, the charging method provided by the embodiment of the invention can improve the charging amount, so that the utilization rate of the battery is greatly improved.
And the second method comprises the following steps: voltage control method
In the voltage control method, the terminal device may not need to be provided with an electricity meter, and the charging control system of the voltage control method is as shown in fig. 9, and includes a controller, a charging module and a battery, where the controller is connected to the battery and the charging module, and the charging module is connected to the battery, the controller is provided with an analog-to-digital converter (ADC) interface to read the battery voltage (generally, devices that need to be charged can support this function), and the controller can control the charging module to adjust the charging current.
301. The voltage value a for entering the constant voltage charging is determined by a conventional charging method.
For example, the charging method shown in fig. 1 can be used to determine the voltage value a from the constant-current charging stage to the constant-voltage charging stage.
After a is measured, the rated voltage of the battery is taken as b, the last step is taken as 30mV-40mV, 40mV is taken here, the electric quantity between a- (b-40mV) is taken to be divided into n-1 sections, namely the nth step is (b-40mV) -b, namely the last charging stage is (b-40mV) -b.
Wherein, the last step value of 30-40mV is that the normal voltage of the lithium battery falls back to 30-40mV after the lithium battery is fully charged according to the practical test experience.
302. The voltage range for each charging phase is determined, as well as the charging current value.
Determining the cell voltage after (b-40mV) -b is the last charge phase may be divided equally for a- (b-40mV) for n-1 segments, resulting in a voltage width of c for each segment.
For example, if a is 4.3V and the battery rated voltage b is 4.45V, then N is equal to 4, i.e. divided into 5 charging phases, and the voltage span from the 2 nd charging phase to the nth charging phase is ((4.45-0.04) -4.3V)/3 ≈ 0.04V.
The control logic may be:
1, charging stage: when the voltage of the battery is lower than 4.3V, the charging current is 800 mA;
and 2, a charging stage: when the voltage of the battery is 4.3-4.34V, the charging current is 638 mA;
and 3, a charging stage: when the voltage of the battery is 4.34-4.38, the charging current is 476 mA;
and 4, a charging stage: when the voltage of the battery is 4.38-4.41, the charging current is 314 mA;
and 5, a charging stage: when the battery voltage is 4.41-4.45, the charging current is 150 mA.
The battery voltage value and the charging current value calculated by the above method can be adjusted according to actual conditions.
The actually measured data of the voltage control method is close to the data of the electric quantity control method, so that the effect of improving the utilization rate of the battery can be achieved.
As shown in fig. 10, an embodiment of the present invention provides a charging chip, including:
the charging module 401 is configured to charge the battery by using different charging currents in N different charging stages, where the N different charging stages are divided according to an electric quantity parameter of the battery, and N is an integer greater than or equal to 2;
the charging method comprises the following steps that the 1 st charging stage is charged to a preset electric quantity parameter by using the maximum allowable charging current value of the battery, the charging is carried out from the preset electric quantity parameter to the battery reaching a full-charge state in the 2 nd charging stage to the Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is sequentially decreased, the charging current value of the last constant current charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the allowable maximum floating voltage and the internal resistance of the battery.
Optionally, the preset current value is determined according to a quotient of the maximum allowable float voltage and the internal resistance of the battery.
The value of N is determined according to the internal resistance of the battery and the allowed maximum internal resistance.
Optionally, in the N charging phases, the decrement of the charging current value in each charging phase is the same.
Alternatively, the charge current value increment amount is obtained according to the following formula:
A＝(Imax-IN)/(N-1)；
wherein A represents the increment and decrement of the charging current value, ImaxDenotes the maximum charging current value, INThe charging current value of the Nth pulse stage is shown, and N represents the total charging stage number.
Optionally, the electric quantity parameter is an electric quantity percentage, or the electric quantity parameter is a voltage value.
The embodiment of the invention also provides terminal equipment, and the terminal equipment comprises the charging chip.
Embodiments of the present invention provide a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute some or all of the steps of the method as in the above method embodiments.
Embodiments of the present invention also provide a computer program product, wherein the computer program product, when run on a computer, causes the computer to perform some or all of the steps of the method as in the above method embodiments.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are exemplary and alternative embodiments, and that the acts and modules illustrated are not required in order to practice the invention.
The terminal device provided by the embodiment of the present invention can implement each process shown in the above method embodiments, and is not described herein again to avoid repetition.
In various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not imply an inevitable order of execution, and the execution order of the processes should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of 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, 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 are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated units, if implemented as software functional units and sold or used as a stand-alone product, may be stored in a computer accessible memory. Based on such understanding, the technical solution of the present invention, which is a part of or contributes to the prior art in essence, 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 causing a computer device (which may be a personal computer, a server, a network device, or the like, and may specifically be a processor in the computer device) to execute part or all of the steps of the above-described method of each embodiment of the present invention.
It will be understood by those of ordinary skill in the art that all or part of the steps in the methods of the above embodiments may be performed by associated hardware instructed by a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes read-only memory (ROM), Random Access Memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
Claims (10)
1. A method of charging, comprising:
the charging method comprises the following steps that N different charging stages are divided according to electric quantity parameters of a battery, the N different charging stages adopt different charging currents to charge the battery, and N is an integer greater than or equal to 2;
the method comprises the following steps that a 1 st charging stage charges the battery to a preset electric quantity parameter according to a maximum allowable charging current value of the battery, the battery is charged to a full state from the preset electric quantity parameter in a 2 nd charging stage to an Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is gradually decreased, the charging current value of the Nth charging stage is smaller than or equal to the preset current value, and the preset current value is determined according to the maximum allowable floating voltage and the internal resistance of the battery.
2. The method of claim 1,
the preset current value is determined according to the quotient of the allowed maximum floating pressure and the internal resistance of the battery.
3. The method of claim 1,
and the value of N is determined according to the internal resistance of the battery and the allowed maximum internal resistance.
4. The method of claim 1, wherein the charging current value for each charging phase is decremented by the same amount over the N charging phases.
5. The method according to claim 4, wherein the charge current value increment amount is obtained according to the following formula:
A＝(Imax-IN)/(N-1)；
wherein A represents the increment of the charging current value, ImaxRepresents the maximum charging current value INPresentation instrumentThe charging current of the Nth charging stage, N represents the total number of charging stages.
6. The method of any of claims 1 to 5, wherein the charge parameter is a charge percentage or the charge parameter is a voltage value.
7. A charging chip, comprising:
the charging module is used for charging the battery by adopting different charging currents in N different charging stages, wherein the N different charging stages are divided according to the electric quantity parameter of the battery, and N is an integer greater than or equal to 2;
the method comprises the following steps that a 1 st charging stage charges the battery to a preset electric quantity parameter according to a maximum allowable charging current value of the battery, the battery is charged to a full state from the preset electric quantity parameter in a 2 nd charging stage to an Nth charging stage, the charging current value of each charging stage in the 2 nd charging stage to the Nth charging stage is sequentially decreased progressively, a first current value of the charging current of the Nth charging stage is smaller than or equal to a preset current value, and the preset current value is determined according to the allowable maximum floating voltage and the internal resistance of the battery.
8. The charging chip of claim 7, comprising: the preset current value is determined according to the quotient of the allowed maximum floating pressure and the internal resistance of the battery.
9. A terminal device, characterized in that the charging device comprises the charging chip of claim 7 or 8.
10. A computer storage medium, in which a computer program is stored, which, when executed, implements the charging method according to any one of claims 1 to 6.
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| CN202010464756.7A CN111525651A (en) | 2020-05-27 | 2020-05-27 | Charging method, charging chip and terminal equipment |
| PCT/CN2020/140720 WO2021238198A1 (en) | 2020-05-27 | 2020-12-29 | Charging method, charging chip, and terminal device |
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