CN114221403B - Charging method and charging device - Google Patents

Abstract

The application relates to the field of terminals and provides a charging method and a charging device. The method comprises the following steps: the electronic equipment acquires a first charging characteristic value of the battery; the electronic equipment acquires a second charging characteristic value and an electrical characteristic value of the battery, wherein the second charging characteristic value is acquired after the first charging characteristic value is acquired; when the electrical characteristic value does not meet the safety requirement and when the first charging characteristic value is smaller than or equal to the second charging characteristic value, the electronic device determines that the charging characteristic value of the battery is a third charging characteristic value, and the third charging characteristic value is a value obtained by subtracting the first numerical value from the first charging characteristic value. The method can improve the safety of the battery in the charging process.

Description

Charging method and charging device

technical field

The present application relates to the field of terminals, in particular to a charging method and a charging device.

Background technique

A terminal device is usually an electronic device with good portability. Therefore, when a user carries and uses the terminal device, the terminal device needs to be powered by a battery. The battery of some terminal devices is a detachable battery. After the power of the battery installed on the terminal device is exhausted, the user can replace a fully charged battery for the terminal device, thereby ensuring that the terminal device continues to work in the portable state.

The new battery replaced by the user for the terminal device may not be produced by the same manufacturer as the original battery, and the terminal device cannot manage the charging process of the new battery according to the charging protection strategy of the original battery. security. In addition, when the charging protection strategy of the original battery fails, it is also dangerous to control charging according to the charging protection strategy of the original battery. Therefore, how to improve the safety of the battery during charging is a problem that needs to be solved at present.

Contents of the invention

Embodiments of the present application provide a charging method, a charging device, a computer-readable storage medium, and a computer program product, which can improve the safety of a battery during charging.

In the first aspect, a charging method is provided, which is applied to an electronic device, and the electronic device contains a battery, and the method includes:

The electronic device obtains the first charging characteristic value of the battery;

The electronic device obtains a second charging characteristic value and an electrical characteristic value of the battery, where the second charging characteristic value is obtained after obtaining the first charging characteristic value;

When the electrical characteristic value does not meet the safety requirements, and when the first characteristic charging value is less than or equal to the second characteristic charging value, the electronic device determines that the characteristic charging value of the battery is the third characteristic charging value, and the third characteristic charging characteristic value is the first A value obtained by subtracting the first value from the charging characteristic value.

The above method can be executed by a power management module in the electronic device. Exemplarily, the power management module can be an embedded controller (embedded controller, EC). After the battery is inserted into the electronic device, the EC can periodically obtain the charging characteristic value of the battery and electrical eigenvalues. When the electrical characteristic value does not meet the safety requirements, it means that the battery is in a dangerous state; the first charging characteristic value and the second charging characteristic value are the charging characteristic values acquired twice by the EC, when the first charging characteristic value is less than or equal to the second charging characteristic value When the eigenvalue is , it means that the charging protection strategy of the battery is invalid, or that there is no charging protection strategy for the battery; at this time, the EC can reduce the charging eigenvalue of the battery, because when the EC obtains the first charging eigenvalue, the electrical characteristic value of the battery satisfies Safety requirements, continuing to reduce the charging characteristic value on the basis of the first charging characteristic value can ensure that the third charging characteristic value meets the safety requirement, thereby improving the safety of the battery during charging.

In an optional embodiment, the method also includes:

When the electrical characteristic value does not meet the safety requirements, and when the first charging characteristic value is greater than the second charging characteristic value, the power management module determines whether the battery supports the charging protection strategy;

When the battery supports the charging protection strategy, the electronic device determines the difference between the first charging characteristic value and the second charging characteristic value;

When the difference is greater than the threshold, the power management module determines that the charging characteristic value of the battery is a second charging characteristic value;

When the difference is less than or equal to the threshold, the power management module determines that the charging characteristic value of the battery is a third charging characteristic value.

The first charging characteristic value being greater than the second charging characteristic value cannot indicate that the charging protection strategy of the battery is in effect. For example, when the electronic device is in the energy-saving mode, there is a possibility that the first charging characteristic value is greater than the second charging characteristic value. In this case, the EC needs to confirm whether the battery supports the charging protection strategy. When the battery supports the charging protection strategy, the EC needs to further determine whether the charging protection strategy is in effect. When the difference is greater than the threshold, it means that the charging characteristic value has dropped significantly. The EC confirms that the charging protection strategy of the battery is in effect, and can continue to follow the second Charging characteristic value is used for charging; when the difference is greater than the threshold value, it means that the charging characteristic value drops small, and EC cannot confirm whether the charging protection strategy of the battery is effective. To be on the safe side, EC can reduce the charging characteristic value, thereby improving the charging process security.

In an optional embodiment, the method also includes:

When the electrical characteristic value does not meet the safety requirements, and when the first charging characteristic value is greater than the second charging characteristic value, the power management module determines whether the battery supports the charging protection strategy;

When the battery does not support the charging protection strategy, the power management module determines that the charging characteristic value of the battery is a fourth charging characteristic value, and the fourth charging characteristic value is a value obtained by subtracting the second value from the second charging characteristic value.

The first charging characteristic value being greater than the second charging characteristic value cannot indicate that the charging protection strategy of the battery is in effect. For example, when the electronic device is in the energy-saving mode, there is a possibility that the first charging characteristic value is greater than the second charging characteristic value. In this case, the EC needs to confirm whether the battery supports the charging protection strategy. When the battery does not support the charging protection strategy, the EC can directly reduce the second charging characteristic value, thereby improving the safety of the battery during charging.

In an optional implementation manner, the second numerical value is positively correlated with the second charging characteristic value.

In this embodiment, the positive correlation means that the second value increases as the second characteristic value of charging increases, or the second value decreases as the second characteristic value of charging decreases. The second characteristic value of charging is a reference amount for reducing the characteristic value of charging. When the second characteristic value of charging is larger, the second value must be a larger value to meet the safety requirement.

In an optional implementation manner, the second value is positively correlated with the second characteristic value of charging, including: the second value is a value obtained by multiplying the second characteristic value of charging by a second coefficient, and the second coefficient is greater than 0 and A value less than 1.

In an optional implementation manner, the first numerical value is positively correlated with the first charging characteristic value.

In this embodiment, the positive correlation means that: the first value increases with the increase of the first characteristic charging value, or the first numerical value decreases with the decrease of the first characteristic charging value. The first characteristic value of charging is a reference amount for reducing the characteristic value of charging. When the first characteristic value of charging is relatively large, the first value must be a large value to meet the safety requirement.

In an optional implementation manner, the first value is positively correlated with the first characteristic value of charging, including: the first value is a value obtained by multiplying the first characteristic value of charging by a first coefficient, and the first coefficient is greater than 0 and A value less than 1.

In an optional implementation, the first characteristic value of charging includes a first charging voltage value, the second characteristic value of charging includes a second charging voltage value, the electrical characteristic value includes the voltage difference between any two cells in the battery, and the electrical characteristic value includes The characteristic value does not meet the safety requirements, including: the voltage difference is greater than the voltage difference threshold.

When the battery includes multiple cells, the excessive voltage difference between the two cells will reduce the life of the removable battery and bring safety hazards. Therefore, the voltage difference between any two cells in the battery is used as an electrical characteristic The value determines whether to start the charging protection strategy, which can slow down the reduction of battery life and improve the safety performance of the battery.

In an optional implementation, the first characteristic value of charging includes the first charging current value, the second characteristic value of charging includes the second charging current value, the electrical characteristic value includes the current value of the battery, and the electrical characteristic value does not meet the safety requirements , including: the current value of the battery is greater than the current threshold.

Excessive battery current will reduce the life of the battery and bring potential safety hazards. Therefore, using the current value of the battery as an electrical characteristic value to determine whether to start the charging protection strategy can slow down the life of the battery and improve battery safety. performance.

In an optional implementation manner, before the electronic device obtains the first charging characteristic value of the battery, the above method further includes: the electronic device reads the charger insertion AC_IN signal and the battery insertion BAT_IN signal; the electronic device reads the AC_IN signal and the BAT_IN signal The level determines whether the charger and the battery are inserted into the electronic device; the electronic device obtains the first charging characteristic value of the battery, including: when the charger and the battery are inserted into the electronic device, the electronic device obtains the first charging characteristic value of the battery; the electronic device obtains The second charging characteristic value and electrical characteristic value of the battery include: the electronic device acquires the second charging voltage, the second charging current and battery information of the battery, wherein the battery information includes the current cell voltage and battery current of the battery.

In an optional implementation manner, when the electrical characteristic value does not meet the safety requirements, and when the first charging characteristic value is less than or equal to the second charging characteristic value, the electronic device determines that the charging characteristic value of the battery is the third charging characteristic value. Characteristic values, including:

When the cell voltage difference is greater than the voltage difference threshold, the electronic device determines whether the first charging voltage is greater than the second charging voltage; when the first charging voltage is less than or equal to the second charging voltage, the electronic device adjusts the charging voltage of the battery to a third charging voltage;

and / or,

When the battery current is greater than the current threshold, the electronic device determines whether the first charging current is greater than the second charging current; when the first charging current is less than or equal to the second charging current, the electronic device adjusts the charging current of the battery to a third charging current.

In an optional implementation manner, the above method further includes: when the electronic device determines that the charging characteristic value of the battery is a third charging voltage and/or a third charging current, the electronic device controls the charging manager to charge the battery with the third charging voltage and/or the third charging current. /or the third charging current to charge the battery; when the electronic device determines that the charging characteristic value of the battery is the fourth charging voltage and/or the fourth charging current, the electronic device controls the charging manager to use the fourth charging voltage and/or the fourth charging current The charging current charges the battery.

In an optional implementation manner, the electronic device obtaining the first charging characteristic value of the battery includes: when the battery is not fully charged, the electronic device obtaining the first charging voltage and the first charging current of the battery.

In an optional implementation manner, the above method further includes: when the battery is fully charged, the electronic device controls the charging manager to stop charging the battery.

This embodiment can prevent battery damage caused by battery overcharging.

In a second aspect, a charging device is provided, including a unit for performing any one of the methods in the first aspect. The device may be a terminal device, or a chip in the terminal device. The device may comprise an input unit and a processing unit.

When the device is a terminal device, the processing unit may be a processor, and the input unit may be a communication interface; the terminal device may also include a memory, which is used to store computer program codes, and when the processor executes the When the computer program code is used, the terminal device is made to execute any one of the methods in the first aspect.

When the device is a chip in the terminal device, the processing unit may be a logic processing unit inside the chip, and the input unit may be an output interface, a pin or a circuit, etc.; the chip may also include a memory, and the memory may be the The internal memory (for example, register, cache, etc.), can also be located in the memory outside the chip (for example, read-only memory, random access memory, etc.); the memory is used to store computer program code, when the processor executes the The computer program code stored in the memory causes the chip to execute any method of the first aspect.

In the third aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores computer program code, and when the computer program code is run by the charging device, the device executes any one of the methods in the first aspect .

In a fourth aspect, a computer program product is provided, and the computer program product includes: computer program code, when the computer program code is run by a charging device, the device is made to execute any one of the methods in the first aspect.

Description of drawings

Fig. 1 is a schematic diagram of a hardware system applicable to the device of the present application;

Fig. 2 is a schematic diagram of a charging process of a notebook computer provided by the present application;

Fig. 3 is a schematic diagram of a method for starting a charging protection strategy according to the cell voltage difference provided by the present application;

FIG. 4 is a schematic diagram of a method for starting a charging protection strategy according to battery current provided by the present application;

Fig. 5 is a schematic diagram of an embodiment of the charging method provided by the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 shows a hardware system applicable to the device of this application.

The device 100 may be a mobile phone, a smart screen, a tablet computer, a wearable electronic device, a vehicle electronic device, an augmented reality (augmented reality, AR) device, a virtual reality (virtual reality, VR) device, a notebook computer, an ultra mobile personal computer (ultra -mobile personal computer, UMPC), netbook, personal digital assistant (personal digital assistant, PDA), projector, etc. The embodiment of the present application does not impose any limitation on the specific type of the device 100 .

The device 100 may include a processor 110, an internal memory 121, a charging interface 130, a charging management module 140, a power management module 141, a battery 142, and the like.

It should be noted that the structure shown in FIG. 1 does not constitute a specific limitation on the device 100 . In other embodiments of the present application, the device 100 may include more or fewer components than those shown in FIG. 1 , or the device 100 may include a combination of some of the components shown in FIG. 100 may include subcomponents of some of the components shown in FIG. 1 . The components shown in FIG. 1 can be realized in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units. For example, the processor 110 may include at least one of the following processing units: an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor) , ISP), controller, video codec, digital signal processor (digital signal processor, DSP), baseband processor, neural network processor (neural-network processing unit, NPU). Wherein, different processing units may be independent devices or integrated devices.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 110 is reduced, thereby improving the efficiency of the system.

The internal memory 121 may be used to store computer-executable program codes including instructions. The internal memory 121 may include an area for storing programs and an area for storing data. Wherein, the stored program area can store an operating system and an application program required by at least one function (for example, a power management function). The storage data area can store data created during the use of the device 100 (eg, power management policies).

In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, and universal flash storage (universal flash storage, UFS). The processor 110 executes various processing methods of the device 100 by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The charging management module 140 is used for receiving power from the charging interface 130 .

In some wired charging embodiments, the charging interface 130 is a universal serial bus (universal serialbus, USB) interface, and the charging management module 140 can receive current through the USB interface. The USB interface is an interface conforming to the USB standard specification, for example, it may be a mini (Mini) USB interface, a micro (Micro) USB interface or a Type-C USB (USB Type C) interface. The USB interface can be used to connect a charger to charge the device 100 , can also be used to transmit data between the device 100 and peripheral devices, and can also be used to connect an earphone to play audio through the earphone.

In some wireless charging embodiments, the charging interface 130 may be a wireless charging coil, and the charging management module 140 may receive electromagnetic waves through the wireless charging coil.

While the charging management module 140 is charging the battery 142 , it can also supply power to the device 100 through the power management module 141 .

The power management module 141 is used for connecting the battery 142 , the charging management module 140 and the processor 110 . The power management module 141 receives the input of the battery 142 and/or the charging management module 140 to supply power for modules such as the processor 110 and the internal memory 121 . The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle times, and battery health status (eg, leakage, impedance). Optionally, the power management module 141 may be set in the processor 110, or the power management module 141 and the charge management module 140 may be set in the same device.

The connection relationship between the modules shown in FIG. 1 is only a schematic illustration, and does not constitute a limitation on the connection relationship between the modules of the device 100 .

In an optional embodiment, the device 100 is a notebook computer, the power management module 141 is an EC on the motherboard of the notebook computer, the power management module 141 is a charging manager (charger) of the notebook computer, and the battery 142 is an Installed removable battery.

EC is usually a 16-bit single-chip microcomputer, which is used to control the battery, fan and indicator light of the notebook computer, and is usually welded on the motherboard of the notebook computer.

EC has its own firmware (firmware) and memory, which is called EC random access memory (random access memory, RAM). EC RAM contains two address locations (0x62, 0x66) and two registers (EC_SC and EC_DATA). Table 1 shows the correspondence between address locations and registers.

Table 1

register offset/port R/W illustrate EC_SC 0x66 R EC status register EC_SC 0x66 W EC command register EC_DATA 0x62 R/W EC data register

EC_SC has both status register and command register functions, and EC_DATA is used to store data. Offset/port refers to the port address of the low pin count (LPC) bus connected to the EC and the basic input output system (BIOS). R means readable, W means writable, and BIOS can Read the value in EC_SC through port 0x66, or send commands to EC_SC through port 0x66; similarly, BIOS can read the value in EC_SC through port 0x62, or send data to EC_SC through port 0x66.

The EC and the battery can communicate through the system management bus (SMBus). The device sends commands to the slave device through SMBus, and can also collect data from the slave device through SMBus.

For example, when the master device is an EC and the slave device is a battery, the EC can send commands to the battery through the SMBus clock line, ordering the battery to report current status information (current battery voltage, battery current, battery temperature, etc.); then, the battery can Report the current status information to the EC through the SMBus data line.

The charging process of the notebook computer will be described below in conjunction with FIG. 2 .

S201, the EC judges whether the charger and the battery are plugged into the notebook computer.

When the charger is plugged into the laptop, the charger detects the 5V voltage and pulls up the AC_IN signal, and the EC detects the AC_IN signal whose level is pulled up, thus confirming that the charger is plugged into the laptop. Therefore, the EC can judge according to the level of the AC_IN signal Is the charger plugged into the laptop. Exemplarily, when the EC detects that the AC_IN signal is a high-level signal, the EC determines that the charger is plugged into the laptop; when the EC detects that the AC_IN signal is a low-level signal, the EC determines that the charger is not plugged into the laptop.

When the battery is inserted into the laptop, the battery pulls up the BAT_IN signal, and the EC can detect the BAT_IN signal whose level is pulled up. Therefore, the EC can judge whether the battery is plugged into the laptop according to the level of the BAT_IN signal. Exemplarily, when the EC detects that the BAT_IN signal is a high-level signal, the EC determines that the battery is inserted into the notebook computer; when the EC detects that the BAT_IN signal is a low-level signal, the EC determines that the battery is not inserted into the notebook computer.

Based on the insertion of the battery and the charger, the EC may execute S202, S203 and S209 described below.

If the EC determines that the battery is inserted into the notebook computer and the charger is not inserted into the notebook computer, the EC may control the battery to discharge, that is, the EC executes S202.

If the EC determines that the battery is not inserted into the notebook computer and the charger is inserted into the notebook computer, the EC may control the charger to supply power to the notebook computer, and determine that the charging current is 0, that is, the EC executes S209.

If the EC determines that the battery is inserted into the notebook computer and the charger is inserted into the notebook computer, the EC may execute S203.

S203, the EC reads battery information.

Battery information includes battery cell voltage, battery current, charging voltage, charging current, and battery temperature. If the battery information is abnormal, the EC cannot guarantee the safety of the laptop. Therefore, the EC needs to check whether the battery information is normal.

Exemplarily, the EC can obtain the battery information through the SMBus address 0x16, and execute S204 and S205.

S204, the EC judges whether the battery voltage is normal.

Charging the battery according to the normal charging mode when the voltage is too high will cause damage to the battery. Therefore, the EC needs to judge whether the battery voltage is normal.

Judging whether the voltage is normal can be based on a voltage threshold (such as 12.9V). When the battery voltage is greater than or equal to 12.9V, the EC determines that the battery voltage is abnormal; when the battery voltage is less than 12.9V, the EC determines that the battery voltage is normal.

S205, the EC judges whether the battery current is normal.

Charging the battery in the normal charging mode when the battery current is too high will cause damage to the battery. Therefore, the EC needs to judge whether the battery current is normal.

Judging whether the battery current is normal can be based on the current threshold. When the battery current is greater than or equal to the current threshold, the EC determines that the battery current is abnormal; when the battery current is less than the current threshold, the EC determines that the battery current is normal.

It should be noted that the EC may execute S204 first and then S205, or execute S205 first and then S204, or execute S204 and S205 at the same time. This application does not limit the execution order of S204 and S205.

S206, the EC controls the charging manager (charger) to charge the battery with the adjusted charging voltage and/or charging current.

When any one of the battery current and cell voltage is within an abnormal range, the EC needs to adjust the charging voltage and/or charging current to avoid safety accidents or damage to the battery during charging.

Exemplarily, the EC may reduce the charging voltage and/or the charging current, and the method for reducing the charging voltage and/or the charging current will be described in detail below.

S207, the EC controls the charging manager (charger) to charge the battery with the charging current and charging voltage read in S203.

When the battery current and cell voltage are both within the normal range, the battery can be charged with the charging current (such as 2A) read by S203, so that it can be charged quickly under the premise of ensuring safety.

Optionally, the EC may also determine whether the battery temperature is normal before performing S207.

Charging the battery in the normal charging mode when the temperature is too high or too low will cause the battery to be damaged or even explode. Therefore, the EC needs to judge whether the battery temperature is normal.

For example, the normal temperature range of the battery is [5°C, 45°C]. If the current battery temperature is within [5°C, 45°C], EC determines that the current battery temperature is normal; if the current battery temperature is outside [5°C, 45°C]. , the EC determines that the current battery temperature is abnormal.

Among them, when the battery temperature is outside [0°C, 45°C], the EC executes S209; when the battery temperature is within [0°C, 5°C], the EC confirms that the current battery temperature is low, but not lower than the temperature lower limit ( 0° C.), at this time, the EC may execute S206 to control the charging manager (charger) to charge the battery with a small current (such as 400mA), and start execution from S203 again after a period of time.

Current charging can cause the temperature of the battery to rise. EC controls the charge manager to charge the battery with a small current, which can gradually increase the temperature of the battery to the normal range, thereby restoring the battery's charging capacity while ensuring safety.

S208, the EC determines whether the battery is fully charged.

When the battery is not fully charged, the status of the full capacity status bit (such as bit5) is 0; when the battery is fully charged, the status of the full capacity status bit (such as bit5) is 1. EC can determine whether the battery is fully charged according to the full capacity status bit.

If the battery is fully charged, the EC may execute S209.

S209, the EC controls the charger to stop charging.

After the battery is fully charged, the EC can control the charger to stop charging, and supply power to the laptop through the charger, and the charging current is 0 at this time.

The charging process of the notebook computer is introduced in detail above. When charging the battery, the state of the battery is constantly changing. The EC needs to adjust the charging voltage and charging current according to the current state of the battery to ensure that the battery can be charged safely.

For some batteries with charging protection strategies (such as original batteries), the EC can read the parameters of the charging protection strategy from these batteries, and control the charging voltage and charging current of the battery according to these parameters. For some batteries that do not have a charging protection strategy (for example, non-original batteries) or some batteries whose charging protection strategy fails, the EC cannot obtain the charging protection strategy parameters of these batteries, which may lead to danger in the charging process.

The charging method provided by the present application will be described below with reference to FIG. 3 and FIG. 4 . The charging method can improve the safety of a battery without a charging protection strategy or a battery with a failed charging protection strategy during charging.

When the battery in the notebook is a multi-cell battery, the excessive voltage difference between the two cells will reduce the life of the battery and bring potential safety hazards; the large current value of the battery will also reduce the life of the battery and cause a safety hazard pose a safety hazard. Therefore, using the voltage difference between any two cells in the battery as the electrical characteristic value to judge whether it is necessary to start the charging protection strategy, and/or using the battery current value as the electrical characteristic value to judge whether it is necessary to start the charging protection strategy can slow down the battery. Life expectancy is reduced, and battery charging safety is improved.

Firstly, the method of starting the charging protection strategy according to the voltage difference between the cells is introduced.

As shown in FIG. 3 , during the battery charging process, the EC obtains that the voltage difference between the cells in the battery is greater than the first threshold, and then the EC determines that the battery needs to be protected against overcharging of a single cell.

For example, the battery contains 4 cells, the voltage values of the 4 cells read by the EC through the SMBus are 4.2V, 3.1V, 4.1V and 3.8V respectively, the maximum voltage difference is 1.1V, and the first threshold is 0.9V , 1.1V is greater than 0.9V, indicating that there is a greater risk in the safety and reliability of the battery, and the battery needs to be charged under the control of the charging parameters with the charging protection function.

The EC can successively obtain two charging voltages, namely, voltage A and voltage B, wherein voltage B is the charging voltage obtained when reading the cell voltage, and voltage A is the charging voltage obtained before obtaining voltage B.

Case 1, voltage A is less than or equal to voltage B.

If the voltage A is less than or equal to the voltage B, it means that the charging voltage of the battery has not dropped after a period of time, and the battery is in a dangerous charging state. The EC can instruct the charger to set the charging voltage as "voltage A-a%*voltage A", that is, reduce the charging voltage on the basis of voltage A, where a is a natural number greater than 0.

For example, if the voltage A is 20V, then the EC can set the charging voltage to 20-20*10%=18V.

Case 2, voltage A is greater than voltage B.

If the voltage A is greater than the voltage B, it means that the charging voltage of the battery drops after a period of time, and the battery may be in a safe charging state. EC can further judge whether there is a charging protection strategy for the battery.

The EC can read the American standard code for information interchange (ASCII) from the battery. ASCII usually contains the battery manufacturer's identifier (identifier, ID), such as the last two characters of ASCII. After the EC obtains the battery manufacturer's ID from the ASCII, it determines whether the battery has a charging protection strategy according to Table 2.

Table 2

Optimized battery charge management Anti-single cell overcharge IR compensation Battery Manufacturer 1 support not support not support Battery Manufacturer 2 support not support support Battery Manufacturer 3 support support support

Table 2 is a relationship table between battery manufacturer IDs stored by the EC and battery charging protection policies.

If the manufacturer ID contained in ASCII is the ID of battery manufacturer 1, the EC can determine according to Table 2 that the battery does not have a charging protection strategy for preventing single-cell overcharging, and does not have a charging protection strategy for IR compensation.

If the manufacturer ID contained in ASCII is the ID of battery manufacturer 2, the EC can determine according to Table 2 that the battery does not have a charging protection strategy for preventing single-cell overcharging, and that there is a charging protection strategy for IR compensation.

If the manufacturer ID contained in ASCII is the ID of battery manufacturer 3, the EC can determine from Table 2 that the battery has a charging protection strategy for preventing single-cell overcharging and a charging protection strategy for IR compensation.

In case 2.1, there is no charging protection strategy for the battery.

If there is no charging protection strategy for the battery, EC can instruct the charger to set the charging voltage as "voltage B-a%*voltage A", that is, reduce the charging voltage on the basis of voltage B.

For example, voltage A is 20V and voltage B is 19V, then the EC can set the charging voltage to 19-20*10%=17V.

Since the voltage B is lower than the voltage A in the case 2.1, reducing the charging voltage on the basis of the voltage B can further improve the charging safety of the battery.

In case 2.2, the battery has a charging protection strategy.

If there is a charging protection strategy for the battery, the EC can further judge whether the drop in the charging voltage is large enough, that is, judge whether the voltage A minus the voltage B is greater than the second threshold, where the second threshold can be a%*voltage A.

If the voltage A minus the voltage B is greater than the second threshold, it means that the charging voltage of the battery has dropped significantly, the battery can be safely charged under the current charging conditions, and the EC determines that the voltage B does not need to be adjusted.

If the voltage A minus the voltage B is less than or equal to the second threshold, it means that the drop of the battery charging voltage is small, and there is a safety risk in charging the battery with the voltage B, and the EC can instruct the charger to set the charging voltage as "voltage A-a%*voltage A", that is, the charging voltage is reduced on the basis of the voltage A.

The following describes the method of starting the charging protection strategy according to the battery current.

As shown in FIG. 4 , during the charging process of the battery, if the battery current value obtained by the EC is greater than the third threshold, the EC determines that the battery needs to be protected by IR current.

For example, the battery current value obtained by the EC is 10A, the first threshold is 9.5A, and 10A is greater than 9.5A, indicating that there is a greater risk in the safety and reliability of the battery, and the battery needs to be controlled under the charging parameters with the charging protection function. down to charge.

The EC can successively obtain two charging currents, namely, current A and current B, wherein current B is the charging current obtained when obtaining the current value of the battery, and current A is the charging current obtained before obtaining current B.

Case 3, current A is less than or equal to current B.

If the current A is less than or equal to the current B, it means that the charging current of the battery does not drop after a period of time, and the battery is in a dangerous charging state. EC can instruct the charger to set the charging current as "current A-a%*current A", that is, reduce the charging current on the basis of current A, where a is a natural number greater than 0.

For example, if the current A is 8A, then the EC can set the charging current to 8-8*10%=7.2A.

Case 4, current A is greater than current B.

If the current A is greater than the current B, it means that the charging current of the battery drops after a period of time, and the battery may be in a safe charging state. EC can further judge whether there is a charging protection strategy for the battery.

The EC can read the American standard code for information interchange (ASCII) from the battery. ASCII usually contains the battery manufacturer's identifier (identifier, ID), such as the last two characters of ASCII. After the EC obtains the battery manufacturer's ID from the ASCII, it determines whether the battery has a charging protection strategy according to Table 2.

If the manufacturer ID contained in ASCII is the ID of battery manufacturer 1, the EC can determine according to Table 2 that the battery does not have a charging protection strategy for preventing single-cell overcharging, and does not have a charging protection strategy for IR compensation.

If the manufacturer ID contained in ASCII is the ID of battery manufacturer 2, the EC can determine according to Table 2 that the battery does not have a charging protection strategy for preventing single-cell overcharging, and that there is a charging protection strategy for IR compensation.

If the manufacturer ID contained in ASCII is the ID of battery manufacturer 3, the EC can determine from Table 2 that the battery has a charging protection strategy for preventing single-cell overcharging and a charging protection strategy for IR compensation.

In case 4.1, there is no charging protection strategy for the battery.

If the battery does not have a charging protection strategy, the EC can instruct the charger to set the charging current as "current B-a%*current A", that is, reduce the charging current on the basis of current B.

For example, if the current A is 8V and the current B is 7.5V, then the EC can set the charging current to 7.5-8*10%=6.7A.

Since the current B is smaller than the current A in case 4.1, reducing the charging current on the basis of the current B can further improve the charging safety of the battery.

In case 4.2, there is a charging protection strategy for the battery.

If the battery has a charging protection strategy, the EC can further determine whether the drop in charging current is large enough, that is, determine whether the current A minus the current B is greater than the fourth threshold, where the fourth threshold can be a%*current A.

If the current A minus the current B is greater than the fourth threshold, it means that the charging current of the battery has dropped significantly, the battery can be safely charged under the current charging conditions, and the EC determines that the current B does not need to be adjusted.

If the current A minus the current B is less than or equal to the second threshold, it means that the charging current of the battery has a small drop, and there is a safety risk in charging the battery with the current B. The EC can instruct the charger to set the charging current as "current A-a%*current A", that is, reduce the charging current on the basis of the current A.

It should be noted that the EC may execute the method shown in FIG. 3 alone, may also execute the method shown in FIG. 4 alone, and may also execute the methods shown in FIG. 3 and FIG. 4 simultaneously.

To sum up, when the electrical characteristic value (the voltage difference of the battery cell, and/or the current of the battery) does not meet the safety requirements, it means that the battery is in a dangerous state; the first charging characteristic value and the second charging characteristic value are EC successively The charging characteristic value obtained twice, when the first charging characteristic value is less than or equal to the second charging characteristic value, it means that the charging protection strategy of the battery is invalid, or that there is no charging protection strategy for the battery; at this time, the EC can reduce the charging protection strategy of the battery. Charging characteristic value (charging voltage, and/or, charging current), thereby improving the safety of the battery during charging.

Another embodiment of the charging method provided by the present invention will be introduced below with reference to FIG. 5 . This embodiment includes the following steps.

S510, the electronic device acquires a first charging characteristic value of the battery.

The battery can be a non-removable battery or a removable battery.

In an optional implementation, the battery is a removable battery, and before the electronic device obtains the first charging characteristic value of the battery, it first reads the charger insertion AC_IN signal and the battery insertion BAT_IN signal; then, the electronic device reads the AC_IN signal according to the AC_IN signal The levels of the and BAT_IN signals determine whether the charger and the battery are inserted into the electronic device; when the charger and the battery are inserted into the electronic device, the electronic device obtains the first charging characteristic value of the battery.

S520. The electronic device acquires a second charging characteristic value and an electrical characteristic value of the battery, where the second charging characteristic value is acquired after the first charging characteristic value is acquired.

S530. When the electrical characteristic value does not meet the safety requirements, and when the first characteristic charging value is less than or equal to the second characteristic charging value, the electronic device determines that the characteristic charging value of the battery is a third characteristic charging value, and the third characteristic charging characteristic value is is a value obtained by subtracting the first numerical value from the first charging characteristic value.

The method shown in FIG. 5 may be executed by a power management module in the electronic device. Exemplarily, the power management module may be an EC, and the EC may periodically obtain the charging characteristic value and the electrical characteristic value of the battery.

In an optional implementation, the first characteristic value of charging includes a first charging voltage value, the second characteristic value of charging includes a second charging voltage value, the electrical characteristic value includes the voltage difference between any two cells in the battery, and the electrical characteristic value includes The characteristic value does not meet the safety requirements, including: the voltage difference is greater than the voltage difference threshold.

In another optional implementation manner, the first characteristic value of charging includes the first charging current value, the second characteristic value of charging includes the second charging current value, the electrical characteristic value includes the current value of the battery, and the electrical characteristic value does not meet the safety requirements. Requirements include: the current value of the battery is greater than the current threshold.

The EC can only judge whether the voltage difference meets the safety requirements, or only judge whether the current value of the battery meets the safety requirements (for example, the battery contains only one battery cell), or judge whether the voltage difference and the current value of the battery meet the safety requirements at the same time.

When the electrical characteristic value does not meet the safety requirements, it means that the battery is in a dangerous state; the first charging characteristic value and the second charging characteristic value are the charging characteristic values acquired twice by the EC, when the first charging characteristic value is less than or equal to the second charging characteristic value When the eigenvalue is , it means that the charging protection strategy of the battery is invalid, or that there is no charging protection strategy for the battery; at this time, the EC can reduce the charging eigenvalue of the battery, because when the EC obtains the first charging eigenvalue, the electrical characteristic value of the battery satisfies Safety requirements, continuing to reduce the charging characteristic value on the basis of the first charging characteristic value can ensure that the third charging characteristic value meets the safety requirement, thereby improving the safety of the battery during charging.

In an optional implementation manner, the first numerical value is positively correlated with the first charging characteristic value.

For example, the first value is a value obtained by multiplying the first charging characteristic value by a first coefficient, and the first coefficient is a value greater than 0 and less than 1.

In this embodiment, the positive correlation means that: the first value increases with the increase of the first characteristic charging value, or the first numerical value decreases with the decrease of the first characteristic charging value. The first characteristic value of charging is a reference amount for reducing the characteristic value of charging. When the first characteristic value of charging is relatively large, the first value must be a large value to meet the safety requirement.

In an optional implementation manner, the method shown in FIG. 5 also includes:

When the electrical characteristic value does not meet the safety requirements, and when the first charging characteristic value is greater than the second charging characteristic value, the power management module determines whether the battery supports the charging protection strategy;

When the battery supports the charging protection strategy, the power management module determines the difference between the first charging characteristic value and the second charging characteristic value;

When the difference is greater than the threshold, the power management module determines that the charging characteristic value of the battery is a second charging characteristic value;

When the difference is less than or equal to the threshold, the power management module determines that the charging characteristic value of the battery is a third charging characteristic value.

The first charging characteristic value being greater than the second charging characteristic value cannot indicate that the charging protection strategy of the battery is in effect. For example, when the electronic device is in the energy-saving mode, there is a possibility that the first charging characteristic value is greater than the second charging characteristic value. In this case, the EC needs to confirm whether the battery supports the charging protection strategy. When the battery supports the charging protection strategy, the EC needs to further determine whether the charging protection strategy is in effect. When the difference is greater than the threshold, it means that the charging characteristic value has dropped significantly. The EC confirms that the charging protection strategy of the battery is in effect, and can continue to follow the second Charging characteristic value is used for charging; when the difference is greater than the threshold value, it means that the charging characteristic value drops small, and EC cannot confirm whether the charging protection strategy of the battery is effective. To be on the safe side, EC can reduce the charging characteristic value, thereby improving the charging process security.

In an optional implementation manner, the method shown in FIG. 5 also includes:

When the electrical characteristic value does not meet the safety requirements, and when the first charging characteristic value is greater than the second charging characteristic value, the power management module determines whether the battery supports the charging protection strategy;

When the battery does not support the charging protection strategy, the power management module determines that the charging characteristic value of the battery is a fourth charging characteristic value, and the fourth charging characteristic value is a value obtained by subtracting the second value from the second charging characteristic value.

The first charging characteristic value being greater than the second charging characteristic value cannot indicate that the charging protection strategy of the battery is in effect. For example, when the electronic device is in the energy-saving mode, there is a possibility that the first charging characteristic value is greater than the second charging characteristic value. In this case, the EC needs to confirm whether the battery supports the charging protection strategy. When the battery does not support the charging protection strategy, the EC can directly reduce the second charging characteristic value, thereby improving the safety of the battery during charging.

In an optional implementation manner, the second numerical value is positively correlated with the second charging characteristic value.

For example, the second value is a value obtained by multiplying the second charging characteristic value by a second coefficient, and the second coefficient is a value greater than 0 and less than 1.

In this embodiment, the positive correlation means that the second value increases as the second characteristic value of charging increases, or the second value decreases as the second characteristic value of charging decreases. The second characteristic value of charging is a reference amount for reducing the characteristic value of charging. When the second characteristic value of charging is larger, the second value must be a larger value to meet the safety requirement.

In an optional implementation manner, the method shown in FIG. 5 further includes: when the electronic device determines that the charging characteristic value of the battery is the third charging characteristic value, the electronic device controls the charging manager to charge the battery with the third charging characteristic value. Charging; when the electronic device determines that the charging characteristic value of the battery is the fourth charging characteristic value, the electronic device controls the charging manager to charge the battery with the fourth charging characteristic value.

In an optional implementation manner, the above method further includes: when the battery is fully charged, the electronic device controls the charging manager to stop charging the battery.

This embodiment can prevent battery damage caused by battery overcharging.

The present application also provides a computer program product, which implements the method described in any method embodiment in the present application when the computer program product is executed by a processor.

The computer program product can be stored in a memory, and finally converted into an executable object file that can be executed by a processor after preprocessing, compiling, assembling, linking and other processing processes.

The computer program product can also solidify the code in the chip. This application does not limit the specific form of the computer program product.

The present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a computer, the method described in any method embodiment in the present application is implemented. The computer program may be a high-level language program or an executable object program.

The computer readable storage medium may be a volatile memory or a nonvolatile memory, or may include both a volatile memory and a nonvolatile memory. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rateSDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) And direct memory bus random access memory (directrambus RAM, DR RAM).

Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process and technical effects of the devices and equipment described above can refer to the corresponding processes and technical effects in the foregoing method embodiments, here No longer.

In several embodiments provided in this application, the disclosed systems, devices and methods may be implemented in other ways. For example, some features of the method embodiments described above may be omitted, or not implemented. The device embodiments described above are only illustrative, and the division of units is only a logical function division. In actual implementation, there may be other division methods, and multiple units or components may be combined or integrated into another system. In addition, the coupling between the various units or the coupling between the various components may be direct coupling or indirect coupling, and the above coupling includes electrical, mechanical or other forms of connection.

It should be understood that in various embodiments of the present application, the sequence numbers of the processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, rather than by the embodiments of the present application. The implementation process constitutes any limitation.

Additionally, the terms "system" and "network" are often used herein interchangeably. The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist alone. There are three cases of B. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

In a word, the above descriptions are only preferred embodiments of the technical solutions of the present application, and are not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A charging method applied to an electronic device, wherein the electronic device comprises a battery, the method comprising:

the electronic equipment acquires a first charging characteristic value of the battery;

the electronic equipment acquires a second charging characteristic value and an electrical characteristic value of the battery, wherein the second charging characteristic value is acquired after the first charging characteristic value is acquired;

when the electrical characteristic value does not meet a safety requirement, and when the first charging characteristic value is greater than the second charging characteristic value, the electronic device determines whether the battery supports a charging protection strategy;

when the battery supports a charge protection strategy, the electronic device determines a difference value between the first charge characteristic value and the second charge characteristic value;

when the difference value is larger than a threshold value, the electronic equipment determines that the charging characteristic value of the battery is the second charging characteristic value;

when the difference value is smaller than or equal to the threshold value, the electronic equipment determines that the charging characteristic value of the battery is a third charging characteristic value, and the third charging characteristic value is obtained by subtracting a first numerical value from the first charging characteristic value;

when the battery does not support the charging protection strategy, the electronic device determines that the charging characteristic value of the battery is a fourth charging characteristic value, and the fourth charging characteristic value is obtained by subtracting a second numerical value from the second charging characteristic value.

2. The method of claim 1, wherein the second value is positively correlated with the second charging characteristic value.

3. The method of claim 2, wherein the second value is positively correlated with the second charging characteristic value, comprising:

the second value is obtained by multiplying the second charging characteristic value by a second coefficient, and the second coefficient is a value larger than 0 and smaller than 1.

4. The method of any one of claims 1 to 3, wherein the first charging characteristic value comprises a first charging voltage value, the second charging characteristic value comprises a second charging voltage value, and the electrical characteristic value comprises a voltage difference between any two cells of the battery,

the electrical characteristic value does not meet safety requirements, including:

the voltage difference is greater than a voltage difference threshold.

5. The method of any one of claims 1 to 3, wherein the first charging characteristic value comprises a first charging current value, the second charging characteristic value comprises a second charging current value, the electrical characteristic value comprises a current value of the battery,

the electrical characteristic value does not meet safety requirements, including:

the current value of the battery is greater than a current threshold value.

6. The method according to any one of claims 1 to 3,

before the electronic device obtains the first charging characteristic value of the battery, the method further includes:

the electronic equipment reads a charger insertion AC _ IN signal and a battery insertion BAT _ IN signal;

the electronic equipment determines whether a charger and a battery are inserted into the electronic equipment according to the levels of the AC _ IN signal and the BAT _ IN signal;

the electronic equipment acquires a first charging characteristic value of the battery, and comprises the following steps:

when the charger and the battery are inserted into the electronic device, the electronic device acquires a first charging voltage and a first charging current of the battery;

the electronic device acquiring a second charging characteristic value and an electrical characteristic value of the battery, including:

the electronic equipment acquires a second charging voltage, a second charging current and battery information of the battery, wherein the battery information comprises the current cell voltage and the current of the battery.

7. The method according to any one of claims 1 to 3, wherein the electronic device obtaining a first charging characteristic value of the battery comprises:

when the battery is not fully charged, the electronic device obtains a first charging voltage and a first charging current of the battery.

8. The method of any of claims 1 to 3, further comprising:

when the battery is fully charged, the electronic device controls a charging manager to stop charging the battery.

9. A charging apparatus comprising a processor and a memory, the processor and the memory being coupled, the memory for storing a computer program that, when executed by the processor, causes the apparatus to perform the method of any of claims 1 to 8.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, causes the processor to carry out the method of any one of claims 1 to 8.

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