CN111416412B - Charging control method and device and terminal equipment - Google Patents
Charging control method and device and terminal equipment Download PDFInfo
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- CN111416412B CN111416412B CN202010310333.XA CN202010310333A CN111416412B CN 111416412 B CN111416412 B CN 111416412B CN 202010310333 A CN202010310333 A CN 202010310333A CN 111416412 B CN111416412 B CN 111416412B
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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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- 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
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Abstract
The invention is suitable for the technical field of battery charging, and provides a charging control method, a device and terminal equipment, wherein the method comprises the steps of carrying out periodic charging on a target battery through a first full-charge voltage and a first cut-off current, and monitoring the internal resistance variation of the target battery in the ith charging period; when the internal resistance is increased, if the target battery is in a constant current charging stage, calculating a second full-charge voltage according to the current internal resistance of the target battery; if the target battery is in the constant-voltage charging stage, calculating a second cut-off current according to the current internal resistance of the target battery; and reconfiguring the battery charging parameters of the target battery according to the second full-charge voltage or the second cutoff current, and charging the target battery through the reconfigured battery charging parameters. The invention can effectively shorten the charging time and improve the charging efficiency.
Description
Technical Field
The invention relates to the technical field of battery charging, in particular to a charging control method, a charging control device and terminal equipment.
Background
With the great popularity of portable electronic products, the user's requirements for the rechargeable battery used by the portable electronic products are higher and higher, such as endurance, charging efficiency and charging safety requirements. Currently, lithium batteries are widely used in such products with excellent charge and discharge properties, and have been gradually developed in recent years toward other product application fields.
Generally, the performance of a battery is determined by its own composition structure, and even if a material combination or a battery structure having more excellent performance is developed, there is a problem such that the charging efficiency is remarkably decreased after many uses.
Disclosure of Invention
The invention mainly aims to provide a charging control method, a charging control device and terminal equipment, so as to solve the problem that the charging efficiency of a rechargeable battery in the prior art is reduced along with the increase of the use times.
In order to achieve the above object, a first aspect of an embodiment of the present invention provides a charging control method, including:
periodically charging a target battery through a first full-charge voltage and a first cut-off current, and monitoring the internal resistance variable quantity of the target battery in an ith charging period, wherein i is a positive integer;
when the internal resistance is increased, if the target battery is in a constant current charging stage, calculating a second full-charge voltage according to the current internal resistance of the target battery; if the target battery is in a constant voltage charging stage, calculating a second cutoff current according to the current internal resistance of the target battery;
and reconfiguring the battery charging parameters of the target battery according to the second full-charge voltage or the second cutoff current, and charging the target battery through the reconfigured battery charging parameters.
A second aspect of an embodiment of the present invention provides a charge control device, including:
the internal resistance monitoring module is used for periodically charging the target battery through a first full-charge voltage and a first cut-off current and monitoring the internal resistance variable quantity of the target battery in the ith charging period, wherein i is a positive integer;
the battery charging parameter calculation module is used for calculating a second full-charge voltage according to the current internal resistance of the target battery when the internal resistance is increased and if the target battery is in a constant-current charging stage; if the target battery is in a constant voltage charging stage, calculating a second cutoff current according to the current internal resistance of the target battery;
and the charging module is used for reconfiguring the battery charging parameters of the target battery according to the second full-charge voltage or the second cut-off current and charging the target battery through the reconfigured battery charging parameters.
A third aspect of embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method provided in the first aspect when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as provided in the first aspect above.
The embodiment of the invention provides a charging control method, which comprises the steps of dividing a charging stage of a target battery into a constant-current charging stage and a constant-voltage charging stage, if the internal resistance of the target battery is increased according to the internal resistance variation of the target battery in the ith charging period, calculating a second full-charge voltage according to the current internal resistance of the target battery in the constant-current charging stage, wherein the second full-charge voltage is used as a new battery charging parameter of the target battery to improve the full-charge voltage, so that the charging time of the target battery in the constant-current charging stage is prolonged; and in the constant voltage charging stage, calculating a second cut-off current according to the current internal resistance of the target battery, wherein the second cut-off current is also used as a new battery charging parameter of the target battery to improve the cut-off current, so that the charging time in the constant voltage charging stage is shortened. Because the charging efficiency in the constant-current charging stage is far higher than that in the constant-voltage charging stage, when the internal resistance of the target battery is increased, so that the charging time in the constant-current charging stage is reduced, the charging time in the constant-voltage charging stage is increased, and the total charging time of the target battery is finally increased, the charging time in the constant-current stage is increased by improving the full-charge voltage in the constant-current charging stage, the charging time in the constant-voltage stage is reduced by improving the cut-off current in the constant-voltage charging stage, and the purpose of reducing the total charging time of the target battery is finally achieved, so that the charging efficiency of the target battery is improved.
Drawings
Fig. 1 is a block diagram of a hardware structure of a terminal device according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of a charging control method according to an embodiment of the present invention;
FIG. 3 is a detailed implementation flow of step S201 in FIG. 2;
fig. 4 is a schematic flow chart illustrating an implementation of another charging control method according to an embodiment of the present invention;
fig. 5 is a schematic view of an application flow of the charging control method according to the embodiment of the present invention
Fig. 6 is a schematic structural diagram of a charging control apparatus according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, fig. 1 shows a block diagram of a hardware structure of a terminal device. The terminal device unlocking method provided by the embodiment of the present invention may be applied to the terminal device 10 shown in fig. 1, where the terminal device 10 may include, but is not limited to: the mobile terminal supports short-distance wireless communication and needs to be unlocked, such as a smart phone, a notebook, a tablet personal computer and wearable smart equipment.
As shown in fig. 1, the terminal device 10 includes a memory 101, one or more processors 103 (only one is shown), and optionally, may further include a memory controller 102, a peripheral interface 104, a radio frequency module 105, a key module 106, an audio module 107, a touch screen 108, and a short-range wireless communication module 109. These components may communicate with each other via one or more communication buses/signal lines 110.
It is to be understood that the structure shown in fig. 1 is only an illustration, and does not limit the structure of the terminal device. Terminal device 10 may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
The memory 101 may be configured to store software programs and modules, such as a method for unlocking a terminal device and program instructions/modules corresponding to the terminal device in the embodiments of the present invention, and the processor 103 executes various functional applications and data processing by running the software programs and modules stored in the memory 101, so as to implement a charging control method in the embodiments shown in fig. 2 and fig. 4 described below.
The peripheral interface 104 couples various input/output devices to the CPU and to the memory 101. Processor 103 executes various software, instructions within memory 101 to perform various functions of terminal device 10 and to perform data processing.
In some embodiments, the peripheral interface 104, the processor 103, and the memory controller 102 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The rf module 105 is used for receiving and transmitting electromagnetic waves, and implementing interconversion between the electromagnetic waves and electrical signals, so as to communicate with a communication network or other devices. The rf Module 105 may include various existing circuit elements for performing these functions, such as an antenna, an rf transceiver, a digital signal processor, an encryption/decryption chip, a Subscriber Identity Module (SIM) card, a memory, and so forth. The rf module 105 may communicate with various networks such as the internet, an intranet, a preset type of wireless network, or other devices through a preset type of wireless network. The preset types of wireless networks described above may include cellular telephone networks, wireless local area networks, or metropolitan area networks. The Wireless network of the above-mentioned preset type may use various Communication standards, protocols and technologies, including but not limited to Global System for Mobile Communication (GSM), Enhanced Data GSM Environment (EDGE), Wideband Code Division Multiple Access (W-CDMA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), bluetooth, Wireless Fidelity (WiFi) (e.g., IEEE802.11 a, IEEE802.11 b, IEEE802.1 g and/or IEEE802.11 n), Voice over Internet protocol (VoIP), world wide web for Wireless Access (Wi-Max), other protocols for email, instant messaging, and short messaging, and any other suitable messaging protocol.
The key module 106 provides an interface for a user to input to the terminal device, and the user can press different keys to cause the terminal device 10 to perform different functions.
The touch screen 108 provides both an output and an input interface between the terminal device and the user. In particular, the touch screen 108 displays video output to the user, the content of which may include text, graphics, video, and any combination thereof. Some of the output results are for some of the user interface objects. The touch screen 108 also receives user inputs, such as user clicks, swipes, and other gesture operations, for the user interface objects to respond to these user inputs. The technique of detecting user input may be based on resistive, capacitive, or any other possible touch detection technique. Specific examples of touch screen 108 display units include, but are not limited to, liquid crystal displays or light emitting polymer displays.
The short-range wireless Communication module 109 can perform Identification and data exchange with a compatible device in a short range by using a short-range Communication protocol such as NFC (Near Field Communication) or RFID (Radio Frequency Identification).
Further, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium may be disposed in the terminal device in each of the foregoing embodiments and the following embodiments, and the computer-readable storage medium may be the memory in the foregoing embodiment shown in fig. 1. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, can implement the charging control method in the embodiments shown in fig. 2 to 4 described below.
As shown in fig. 2, an embodiment of the present invention provides a charging control method for improving battery charging efficiency, including, but not limited to, the following steps:
s201, periodically charging the target battery through a first full-charge voltage and a first cut-off current, and monitoring the internal resistance variable quantity of the target battery in the ith charging period, wherein i is a positive integer.
In the above step S201, the charging method based on the target battery is periodic charging; the first full-charge voltage and the first off-current are initial battery charging parameters of the target battery, and the initial battery charging parameters may be set according to an internal resistance when the target battery does not start charging.
S202, when the internal resistance is increased, if the target battery is in a constant current charging stage, calculating a second full-charge voltage according to the current internal resistance of the target battery; if the target battery is in a constant voltage charging stage, calculating a second cutoff current according to the current internal resistance of the target battery;
in step S202, when the internal resistance of the target battery increases, it is necessary to determine the charging stage of the target battery first. The target battery can be analyzed to be in a constant-current charging stage or a constant-voltage charging stage by monitoring voltage change and current change in the charging process of the target battery.
In a specific application, the present internal resistance of the target battery is generally increased as the charging time or the number of times of charging is increased, as compared with the internal resistance when the first full-charge voltage and the first off current are used, and therefore, the second full-charge voltage and the second off current calculated based on the present internal resistance of the target battery are more suitable for the present internal resistance characteristic of the target battery than the first full-charge voltage and the first off current, and in the embodiment of the present invention, the second full-charge voltage is greater than the first full-charge voltage and the second off current is greater than the first off current.
S203, reconfiguring the battery charging parameters of the target battery according to the second full-charge voltage or the second cut-off current, and charging the target battery according to the reconfigured battery charging parameters.
In the above step S203, if the current internal resistance of the target battery increases, the battery charging parameters of the target battery are reconfigured according to the charging phase of the target battery, i.e., the constant current charging phase or the constant voltage charging phase, and the target battery is charged by the reconfigured battery charging parameters.
In practical applications, the charging process of the lithium battery is usually constant current charging, and when the battery voltage approaches to the full charge voltage, constant voltage charging is performed, and when the constant voltage charging is performed, the charging voltage is not changed any more, the charging current is gradually reduced, and finally, the charging is stopped when the charging current reaches the cut-off current.
Therefore, in the step S203, the battery charging parameters of the target battery are reconfigured according to the charging phase of the target battery, which may be expressed as: if the target battery is in the constant-current charging stage, the battery charging parameters are reconfigured, namely after the second full-charge voltage, the value of the full-charge voltage is increased, so that the time for reaching the full-charge voltage is increased, and in the constant-current charging stage, the charging current is the maximum current in the whole charging process, so that the charging capacity in the constant-current charging stage is increased when the time for reaching the full-charge voltage is increased, and the time in the constant-voltage charging stage is reduced. If the target battery is in the constant-voltage charging stage, the battery charging parameters are reconfigured, namely, after the second cut-off current is obtained, the value of the cut-off current is increased, so that the lower limit of the current value in the constant-voltage charging stage is increased, the charging current in the constant-voltage charging stage cannot be too small, and the charging time in the constant-voltage charging stage is reduced.
In practical applications, the constant-voltage charging phase takes longer time, which may account for about 40% of the total charging time, but the charging capacity of the constant-voltage charging phase is only 20% of the full charging capacity, and correspondingly, the constant-current charging phase may account for about 60% of the total charging time, but the charging capacity of the constant-current charging phase is 80% of the full charging capacity, and when the internal resistance of the target battery gradually increases, the time of the constant-current charging phase is shortened, and the charging time of the constant-voltage charging phase is lengthened.
As can be seen from the above, the charging efficiency in the constant current charging stage is at least twice that in the constant voltage charging stage, and assuming that the electric quantity of the target battery is a, the total charging process is represented by 1xT1+0.5xT2, whereas if the charging time T1 in the constant current charging stage is shortened and the charging time T2 in the constant voltage charging stage is lengthened, the total charging time T1+ T2 will be lengthened under the same condition of the target battery electric quantity a.
In the embodiment of the invention, the full-charge voltage is increased according to the current internal resistance of the target battery in the constant-current charging stage, so that the charging time T1 in the constant-current charging stage is prolonged; the cutoff current is increased according to the present internal resistance of the target battery, thereby shortening the charging time T2 of the constant-voltage charging stage. Thus, according to the general charging process expression above: 1xT1+0.5xT2 ═ a, the total charging time T1+ T2 will be shortened for the same target battery charge a.
In one embodiment, one implementation manner of the step S203 may be:
updating the second full-charge voltage and the second off-current to the first full-charge voltage and the first off-current.
In a specific application, after the second full-charge voltage and the second cutoff current calculated in the ith charge cycle are updated to the first full-charge voltage and the first cutoff current, in the next charge cycle of the target battery, that is, in the (i + 1) th charge cycle, the second full-charge voltage or the second cutoff current is continuously calculated according to the current internal resistance of the target battery, the current internal resistance of the target battery increases with time, and the second full-charge voltage or the second cutoff current calculated each time also increases.
As shown in fig. 3, an embodiment of the present invention further exemplarily shows an implementation manner of monitoring the internal resistance variation of the target battery in the ith charging cycle in step S201 in fig. 2, which includes but is not limited to:
s2011, acquiring the initial internal resistance of the target battery at the beginning of the ith charging cycle and the target internal resistance of the target battery at the end of the ith charging cycle;
s2012, calculating the internal resistance variation of the target battery in the ith charging period according to the difference value of the initial internal resistance and the target internal resistance.
In a specific application, if the internal resistance variation of the target battery is small in two adjacent charging cycles, it indicates that the internal resistance variation at this time is caused by a measurement error or a charging environment influence, and cannot indicate that the current internal resistance of the target battery is influenced by an increase in the charging time or an increase in the number of times of charging, and therefore, in step S2012, when the internal resistance variation of the target battery in the ith charging cycle is calculated, the method includes:
calculating the difference value of the initial internal resistance and the target internal resistance, wherein the formula is as follows:
Rd＝R-R0wherein R is the target internal resistance, R0Is the initial internal resistance;
if the difference value is larger than a preset difference value, increasing the internal resistance of the target battery in the ith charging period;
and if the difference value is smaller than a preset difference value, the internal resistance of the target battery in the ith charging period is unchanged.
In the embodiment of the present invention, when the difference between the initial internal resistance and the target internal resistance is greater than the preset difference, it is determined that the current internal resistance of the target battery is increased, and at this time, the battery charging parameter of the target battery needs to be reconfigured.
As shown in fig. 4, another charging control method is shown in the embodiment of the present invention, and based on the charging control method shown in fig. 2, a charging cut-off stage and a monitoring manner of the charging cut-off stage are proposed, so that the charging control method includes:
s401, periodically charging the target battery through a first full-charge voltage and a first cut-off current, and monitoring the internal resistance variable quantity of the target battery in the ith charging period, wherein i is a positive integer.
S402, acquiring the current charging current of the target battery;
and if the current charging current of the target battery is smaller than a preset current value, the target battery is in a charging cut-off stage.
S403, when the internal resistance is increased, if the target battery is in a constant current charging stage, calculating a second full charge voltage according to the current internal resistance of the target battery;
and if the target battery is in the constant voltage charging stage, calculating a second cut-off current according to the current internal resistance of the target battery.
S404, reconfiguring the battery charging parameters of the target battery according to the second full-charge voltage or the second cut-off current, and charging the target battery according to the reconfigured battery charging parameters.
S405, when the internal resistance is increased, if the target battery is in a charge cut-off stage, the charging is finished when the battery electric quantity of the target battery reaches a preset standard.
In the above step S402, the preset current value is close to the cut-off current but smaller than the cut-off current, and the battery capacity of the target battery is smaller than the preset standard. Therefore, in the embodiment of the invention, the target battery is periodically charged for a short time in the charge cut-off stage, so that the battery capacity of the target battery can be charged when the preset standard is just reached.
In an embodiment, in step S405, one implementation manner of completing the charging when the battery capacity reaches the preset standard is as follows:
s4051, suspending charging of the target battery within a first preset time, and monitoring the battery power of the target battery;
s4052, if the electric quantity of the battery is smaller than the preset standard, acquiring a battery charging parameter in the constant-voltage charging stage as a supplementary charging parameter of the charging cut-off stage;
s4053, charging the target battery through the supplementary charging parameters within second preset time;
s4054, after the charging within the second preset time is completed, monitoring the battery electric quantity of the target battery, and if the battery electric quantity does not reach the preset standard, continuing to charge the target battery until the battery electric quantity reaches the preset standard.
In an embodiment of the present invention, the target battery is not charged any more within the first preset time, and the battery power of the target battery is monitored.
According to the above steps S4051 to S4054, in the embodiment of the present invention, the determination of the completion of charging is performed in a manner of "charging → stopping (monitoring the battery power) → charging → stopping (monitoring the battery power) … …", instead of the conventional current detection.
The target battery is charged by suspending charging and monitoring the battery electric quantity in the charging suspension time, acquiring the battery charging parameter in the constant-voltage charging stage as the supplementary charging parameter in the charging ending stage, and accurately judging whether the target battery is fully charged on the premise of safe charging.
It is conceivable that the battery charging parameter at the time near the charge cut-off stage in the constant-voltage charging stage is used as the supplementary charging parameter of the charge cut-off stage, and the current internal resistance characteristic of the target battery is met.
In fig. 5, first, the target battery is charged according to the first full-charge voltage and the first cut-off current, and when the charging is started, the target battery is in the constant-current charging phase. In the charging process, when the battery charging parameters need to be calculated according to the current internal resistance, whether the current charging stage of the target battery is a constant-current charging stage or a constant-voltage charging stage or a charging ending stage needs to be judged first. And in the constant-current charging stage and the constant-voltage charging stage, after the current internal resistance of the target battery is calculated each time, the internal resistance difference value is larger than a preset difference value, and when the internal resistance difference value is increased, the internal resistance of the target battery is considered to be increased, and at the moment, a second full-charge voltage or a second cut-off current is configured to charge the target battery, wherein the second full-charge voltage is larger than the first full-charge voltage, and the second cut-off current is larger than the first cut-off current. When the charging end stage is entered, the current charging current is small, it is assumed to be 500mA in fig. 5, meanwhile, it is assumed that the first preset time is 10s and the second preset time is 20s, whether the battery power of the target battery reaches the preset standard is judged by continuously monitoring the battery voltage within the first preset time 10s when the charging is suspended, if the battery power of the target battery does not reach the preset standard, the target battery is charged by supplementing the charging parameters within the second preset time 20s, the battery voltage is continuously monitored after the charging within the second preset time is completed, whether the battery power of the target battery reaches the preset standard is judged, and the charging is completed until the battery power of the target battery reaches the preset standard. After the charging within the second preset time is completed, the process of continuously monitoring the battery voltage may be to suspend the charging of the target battery within the first preset time of 10s, and monitor the battery power of the target battery.
As shown in fig. 6, an embodiment of the present invention provides a charge control device 60, including:
the internal resistance monitoring module 61 is used for periodically charging the target battery through a first full-charge voltage and a first cut-off current and monitoring the internal resistance variation of the target battery in the ith charging period;
wherein i is a positive integer;
a battery charging parameter calculating module 62, configured to calculate, when the internal resistance increases, a second full-charge voltage according to the current internal resistance of the target battery if the target battery is in a constant-current charging stage; if the target battery is in a constant voltage charging stage, calculating a second cutoff current according to the current internal resistance of the target battery;
and a charging module 63, configured to reconfigure a battery charging parameter of the target battery according to the second full-charge voltage or the second off-current, and charge the target battery according to the reconfigured battery charging parameter.
In the above battery charging parameter calculation module 62, when the internal resistance of the target battery increases, it is necessary to determine the charging stage of the target battery first. The target battery can be analyzed to be in a constant-current charging stage or a constant-voltage charging stage by monitoring voltage change and current change in the charging process of the target battery.
In a specific application, as the charging time or the number of times of charging increases, the current internal resistance of the target battery generally increases as compared with the internal resistance when the first full-charge voltage and the first off current are used, and therefore, the second full-charge voltage and the second off current calculated from the current internal resistance of the target battery are more suitable for the current internal resistance characteristic of the target battery than the first full-charge voltage and the first off current, and the second full-charge voltage is greater than the first full-charge voltage and the second off current is greater than the first off current.
In the above-described charging module 63, if the current internal resistance of the target battery increases, the battery charging parameters of the target battery are reconfigured according to the charging phase of the target battery, i.e., the constant current charging phase or the constant voltage charging phase, and the target battery is charged by the reconfigured battery charging parameters.
In practical applications, the charging process of the lithium battery is usually constant current charging, and when the battery voltage approaches to the full charge voltage, constant voltage charging is performed, and when the constant voltage charging is performed, the charging voltage is not changed any more, and the charging current is gradually reduced, and the charging is stopped when the charging current reaches the cut-off current.
Therefore, in the charging module 63, the battery charging parameters of the target battery are reconfigured according to the charging phase of the target battery, which may be expressed as: if the target battery is in the constant-current charging stage, the battery charging parameters are reconfigured, namely after the second full-charge voltage, the value of the full-charge voltage is increased, so that the time for reaching the full-charge voltage is increased, and in the constant-current charging stage, the charging current is the maximum current in the whole charging process, so that the charging capacity in the constant-current charging stage is increased when the time for reaching the full-charge voltage is increased, and the time in the constant-voltage charging stage is reduced. If the target battery is in the constant-voltage charging stage, the battery charging parameters are reconfigured, namely, after the second cut-off current is obtained, the value of the cut-off current is increased, so that the lower limit of the current value in the constant-voltage charging stage is increased, the charging current in the constant-voltage charging stage cannot be too small, and the charging time in the constant-voltage charging stage is reduced.
In practical applications, the constant-voltage charging phase takes longer time, which may account for about 40% of the total charging time, but the charging capacity of the constant-voltage charging phase is only 20% of the full charging capacity, and correspondingly, the constant-current charging phase may account for about 60% of the total charging time, but the charging capacity of the constant-current charging phase is 80% of the full charging capacity, and when the internal resistance of the target battery gradually increases, the time of the constant-current charging phase is shortened, and the charging time of the constant-voltage charging phase is lengthened.
As can be seen from the above, the charging efficiency in the constant current charging stage is at least twice that in the constant voltage charging stage, and assuming that the electric quantity of the target battery is a, the total charging process is represented by 1xT1+0.5xT2, whereas if the charging time T1 in the constant current charging stage is shortened and the charging time T2 in the constant voltage charging stage is lengthened, the total charging time T1+ T2 will be lengthened under the same condition of the target battery electric quantity a.
In the embodiment of the invention, the full-charge voltage is increased according to the current internal resistance of the target battery in the constant-current charging stage, so that the charging time T1 in the constant-current charging stage is prolonged; the cutoff current is increased according to the present internal resistance of the target battery, thereby shortening the charging time T2 of the constant-voltage charging stage. Thus, according to the general charging process expression above: 1xT1+0.5xT2 ═ a, the total charging time T1+ T2 will be shortened for the same target battery charge a.
Therefore, the charge control device according to the embodiment of the present invention increases the full charge voltage or the off-state current of the target battery when the internal resistance of the target battery increases according to the charge stage of the target battery, thereby prolonging the time of the constant current charge stage, shortening the time of the constant voltage charge stage, and improving the charge efficiency.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the present invention in detail, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A charge control method, comprising:
periodically charging a target battery through a first full-charge voltage and a first cut-off current, and monitoring the internal resistance variable quantity of the target battery in an ith charging period, wherein i is a positive integer; if the internal resistance variation is larger than a preset difference value, increasing the internal resistance of the target battery in the ith charging period; if the internal resistance variation is smaller than a preset difference value, the internal resistance of the target battery is unchanged in the ith charging period;
when the internal resistance is increased, if the target battery is in a constant current charging stage, calculating a second full-charge voltage according to the current internal resistance of the target battery; if the target battery is in a constant voltage charging stage, calculating a second cutoff current according to the current internal resistance of the target battery;
reconfiguring a battery charging parameter of the target battery according to the second full-charge voltage or the second cutoff current, and charging the target battery through the reconfigured battery charging parameter;
when the internal resistance is increased, if the target battery is in a charge cut-off stage, the charging of the target battery is suspended within a first preset time, and the battery electric quantity of the target battery is monitored; if the electric quantity of the battery is smaller than a preset standard, acquiring a battery charging parameter in the constant-voltage charging stage as a supplementary charging parameter of the charging cut-off stage;
charging the target battery through the supplementary charging parameters within a second preset time; and after the charging within the second preset time is finished, monitoring the battery electric quantity of the target battery, and if the battery electric quantity does not reach the preset standard, continuing to charge the target battery until the battery electric quantity reaches the preset standard.
2. The charge control method according to claim 1, wherein reconfiguring the battery charge parameter of the target battery according to the second full-charge voltage or the second off-current, and charging the target battery by the reconfigured battery charge parameter comprises:
updating the second full-charge voltage and the second off-current to the first full-charge voltage and the first off-current;
charging the target battery by the updated first full-charge voltage and the first off-current.
3. The charge control method according to claim 1, wherein monitoring the amount of change in the internal resistance of the target battery in the i-th charging cycle comprises:
acquiring the initial internal resistance of the target battery at the beginning of the ith charging cycle and the target internal resistance of the target battery at the end of the ith charging cycle;
and calculating the internal resistance variation of the target battery in the ith charging period according to the difference value of the initial internal resistance and the target internal resistance.
4. The charge control method according to claim 3, wherein calculating the amount of change in the internal resistance of the target battery in the i-th charging cycle based on the difference between the initial internal resistance and the target internal resistance comprises:
calculating the difference value of the initial internal resistance and the target internal resistance, wherein the formula is as follows:
r d, where R is the target internal resistance and R0 is the initial internal resistance.
5. The charge control method according to claim 1, wherein after the target battery is periodically charged by a first full-charge voltage and a first off-current, and the amount of change in the internal resistance of the target battery in an i-th charging period is monitored, further comprising:
acquiring the current charging current of the target battery;
and if the current charging current of the target battery is smaller than a preset current value, the target battery is in a charging cut-off stage.
6. A charge control device, characterized by comprising:
the internal resistance monitoring module is used for periodically charging the target battery through a first full-charge voltage and a first cut-off current and monitoring the internal resistance variable quantity of the target battery in the ith charging period, wherein i is a positive integer; if the internal resistance variation is larger than a preset difference value, increasing the internal resistance of the target battery in the ith charging period; if the internal resistance variation is smaller than a preset difference value, the internal resistance of the target battery is unchanged in the ith charging period;
the battery charging parameter calculation module is used for calculating a second full-charge voltage according to the current internal resistance of the target battery when the internal resistance is increased and if the target battery is in a constant-current charging stage; if the target battery is in a constant voltage charging stage, calculating a second cutoff current according to the current internal resistance of the target battery;
a charging module, configured to reconfigure a battery charging parameter of the target battery according to the second full-charge voltage or the second off-current, and charge the target battery according to the reconfigured battery charging parameter;
means for performing the following operations:
when the internal resistance is increased, if the target battery is in a charge cut-off stage, the charging of the target battery is suspended within a first preset time, and the battery electric quantity of the target battery is monitored; if the electric quantity of the battery is smaller than a preset standard, acquiring a battery charging parameter in the constant-voltage charging stage as a supplementary charging parameter of the charging cut-off stage; charging the target battery through the supplementary charging parameters within a second preset time; and after the charging within the second preset time is finished, monitoring the battery electric quantity of the target battery, and if the battery electric quantity does not reach the preset standard, continuing to charge the target battery until the battery electric quantity reaches the preset standard.
7. A terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the charging control method according to any one of claims 1 to 5 when executing the computer program.
8. A storage medium which is a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps in the charging control method according to any one of claims 1 to 5.
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| CN112542868B (en) * | 2020-11-27 | 2023-05-23 | Oppo广东移动通信有限公司 | Charging control circuit, method and system and electronic equipment |
| EP4270715A4 (en) * | 2020-12-25 | 2024-03-13 | Ningde Amperex Technology Ltd. | Charging method, electronic device, and storage medium |
| CN113904399B (en) * | 2021-09-03 | 2022-10-14 | 荣耀终端有限公司 | Charging method and terminal equipment |
| CN116961149A (en) * | 2022-04-13 | 2023-10-27 | Oppo广东移动通信有限公司 | Charging method, charging device, electronic apparatus, and computer-readable storage medium |
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