A charging control method, device, chip, terminal and readable storage medium

Abstract

The application belongs to the technical field of battery charging, and particularly relates to a charging control method and device, a chip, a terminal and a readable storage medium. In the embodiment of the application, the output voltage of a charging unit is determined based on the voltage drop of a charging line and the rated voltage of a battery, and the output voltage is greater than the rated voltage of the battery, so that the output voltage compensates for the voltage drop of the charging line, thereby prolonging the charging time of the battery in the constant-current charging phase, that is, the charging time of the constant-current charging phase is prolonged, so that the charging speed of the battery can be improved. In the embodiment of the application, when the battery is charged based on the output voltage, the voltage across the battery is less than or equal to the rated voltage of the battery, so that the charging safety of the battery can also be ensured, and the charging efficiency of the battery is improved while ensuring the charging safety of the battery.

Description

Technical Field

[0001] This application belongs to the field of battery charging technology, and particularly relates to a charging control method, device, chip, terminal and readable storage medium. Background Technology

[0002] To improve the safety of lithium battery charging, it is now required that different currents be used when the battery is at different voltages. Therefore, lithium battery charging typically includes the following four stages: trickle charging, constant current charging, constant voltage charging, and charging termination.

[0003] During the constant voltage charging stage, the charging current continuously decreases, and the charging rate gradually decreases, resulting in a slower increase in battery capacity during this stage, requiring more charging time. Summary of the Invention

[0004] This application provides a charging control method, apparatus, chip, terminal, and readable storage medium that can improve the charging speed of a battery.

[0005] A first aspect of this application provides a charging control method, the charging control method comprising:

[0006] The output voltage of the charging unit is determined based on the voltage drop of the charging line and the rated voltage of the battery; wherein, the charging line is the line between the charging unit and the battery;

[0007] The battery is charged based on the output voltage; the output voltage is greater than the rated voltage, and when the battery is charged based on the output voltage, the voltage across the battery is less than or equal to the rated voltage.

[0008] A second aspect of this application provides a charging control device, the charging control device comprising:

[0009] A determining unit is used to determine the output voltage of the charging unit based on the voltage drop of the charging line and the rated voltage of the battery; wherein the charging line is the line between the charging unit and the battery;

[0010] A charging unit is used to charge the battery based on the output voltage; the output voltage is greater than the rated voltage, and when charging the battery based on the output voltage, the voltage across the battery is less than or equal to the rated voltage.

[0011] A third aspect of this application provides a chip including a processor, which reads and executes a computer program stored in a memory to implement the charging control method of the first aspect described above.

[0012] A fourth aspect of this application provides a terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the charging control method of the first aspect described above.

[0013] A fifth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the charging control method of the first aspect described above.

[0014] In this embodiment, the output voltage of the charging unit is determined based on the voltage drop of the charging line and the rated voltage of the battery. This output voltage is greater than the rated voltage of the battery, thus compensating for the voltage drop of the charging line and increasing the charging time during the constant current charging phase. This extends the charging time of the constant current charging phase, thereby increasing the charging speed of the battery. Furthermore, in this embodiment, when charging the battery based on this output voltage, since the voltage across the battery is less than or equal to the rated voltage, battery charging safety is ensured, achieving improved charging efficiency while maintaining battery charging safety. Attached Figure Description

[0015] To more clearly illustrate the charging control method of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first structural schematic diagram of the battery charging circuit provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the voltage and current output by the charging unit at each stage in a general battery charging control scheme provided in the embodiments of this application.

[0018] Figure 3 This is a schematic diagram of the neckband headphones provided in an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the first implementation process of the charging control method provided in the embodiments of this application;

[0020] Figure 5 This is a schematic diagram of the second implementation process of the charging control method provided in the embodiments of this application;

[0021] Figure 6The embodiments provided in this application are based on Figure 5 A schematic diagram of the voltage and current output by the charging unit at each stage when the battery charging control method is used for charging control;

[0022] Figure 7 This is a schematic diagram of the third implementation process of the charging control method provided in the embodiments of this application;

[0023] Figure 8 This is a schematic diagram of the fourth implementation process of the charging control method provided in the embodiments of this application;

[0024] Figure 9 This is a schematic diagram of the second structure of the battery charging circuit provided in the embodiments of this application;

[0025] Figure 10 This is a schematic diagram of the third structure of the battery charging circuit provided in the embodiments of this application;

[0026] Figure 11 This is a fourth structural schematic diagram of the battery charging circuit provided in the embodiments of this application;

[0027] Figure 12 This is a schematic diagram of the charging control device provided in the embodiments of this application. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] In this document, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, in the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more, and "at least one" or "one or more" means one, two, or more than two.

[0030] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0031] The charging control method of this application embodiment can be applied to various terminals that include battery charging circuits, such as headphones, mobile phones, tablets, in-vehicle devices, augmented reality (AR) / virtual reality (VR) devices, laptops, ultra-mobile personal computers (UMPCs), netbooks, personal digital assistants (PDAs), etc. This application embodiment does not impose any restrictions on the specific type of terminal.

[0032] like Figure 1 The diagram shown is a first structural schematic of a battery charging circuit provided in an embodiment of this application. When the terminal battery is charged using a charging device such as an adapter, the voltage output by the charging device 11 needs to be converted by the charging unit 12 before being output to the battery 13, so that the voltage applied across the battery 13 can be compatible with the battery. The battery can be a lithium battery. The charging unit can be a charging management chip or a charging management circuit.

[0033] To improve the safety of lithium battery charging, current regulations require charging lithium batteries with different currents at different voltage levels. Based on this, such as... Figure 2 As shown, lithium battery charging typically includes the following four stages: trickle charging, constant current charging, constant voltage charging, and charging termination.

[0034] Specifically, when the battery voltage is below the pre-charge voltage threshold, using a large charging current for constant current charging may damage the battery and even pose a danger to the user. Therefore, if... Figure 2 As shown by the dashed line, when the battery voltage is less than the pre-charge voltage threshold (e.g., 3V), the battery first enters the trickle charging stage to perform small-current pre-charge until the terminal battery voltage reaches the pre-charge voltage threshold, at which point the trickle charging stage ends and the constant current charging stage begins.

[0035] The constant current charging stage is also known as the fast charging stage. After the battery enters the constant current charging stage, it uses a larger charging current (such as...) Figure 2 As shown by the solid line, the battery is charged during the constant current charging stage (which is greater than the charging current during the trickle charging stage), thus increasing the battery capacity more quickly.

[0036] During the constant current charging phase, the voltage across the battery gradually increases. To ensure charging safety, the voltage cannot increase indefinitely. Therefore, when the output voltage of the charging unit reaches the constant voltage charging voltage threshold, the battery enters the constant voltage charging phase, meaning it is charged at a constant voltage. After entering the constant voltage charging phase, the charging current continuously decreases. When the charging current falls below the preset charging cutoff current (i.e., the second cutoff current, for example, 10mA), the charging is terminated, at which point the battery's capacity reaches the preset limit.

[0037] like Figure 2 As shown, after entering the charging termination stage, when the battery power decreases, the output voltage of the charging unit will also gradually decrease. When the output voltage of the charging unit is less than the recharge voltage threshold, the battery enters the recharge state. Since this part is not the focus of this application, it will not be described in detail here.

[0038] It should be noted that after the battery enters the constant voltage charging stage, the charging current continuously decreases and the charging rate gradually decreases. Therefore, the battery capacity increases more slowly in this stage and requires more charging time.

[0039] In addition, in some application scenarios, when there is a certain distance between the charging unit and the battery, there will be impedance in the charging line between the two. Therefore, when the battery is charged, a voltage drop will occur on the charging line, which will shorten the duration of the constant current charging stage. That is, the output voltage of the charging unit will increase to the second preset voltage threshold in advance, which will further prolong the constant voltage charging stage and reduce the charging speed.

[0040] For example, when the above terminal is as follows Figure 3 In the neckband headphones shown, to reduce the size of the headphones, in practical applications, the battery and mainboard (which includes the charging unit) are respectively placed on the left and right sides of the headphones and connected by the neckband (which can be rigid or flexible, such as a neckband cable). This creates a certain distance between the charging unit and the battery, resulting in a large impedance on the charging line (which can be set along the neckband) between the charging unit and the battery. This leads to a voltage drop, which shortens the duration of the constant current charging phase of the headphones' battery and reduces the charging speed.

[0041] To address the aforementioned issues, this application provides a charging control method, apparatus, chip, terminal, and readable storage medium that can improve battery charging efficiency.

[0042] For example, such as Figure 4 This illustration shows a first implementation flowchart of a charging control method provided in an embodiment of this application. The charging control method can be applied to applications including... Figure 1 The terminal of the battery charging circuit shown is controlled by the charging control device of that terminal.

[0043] Optionally, the above charging control method can be implemented using the following steps 401 to 402.

[0044] Step 401: Determine the output voltage of the charging unit based on the voltage drop of the charging circuit and the rated voltage of the battery.

[0045] Step 402: Charge the battery based on the output voltage.

[0046] In this embodiment, the charging circuit is the circuit between the charging unit and the battery. The output voltage of the charging unit, determined based on the voltage drop of the charging circuit and the rated voltage of the battery, is greater than the rated voltage of the battery. Furthermore, when charging the battery based on this output voltage, the voltage across the battery is less than or equal to the rated voltage of the battery.

[0047] This application determines the output voltage of the charging unit based on the voltage drop of the charging circuit and the rated voltage of the battery. Furthermore, this output voltage is greater than the rated voltage of the battery, thus compensating for the voltage drop of the charging circuit. This increases the charging time of the battery during the constant current charging phase, thereby extending the charging time of the constant current charging phase and improving the charging speed of the battery. In addition, in the embodiments of this application, when charging the battery based on this output voltage, since the voltage across the battery is less than or equal to the rated voltage of the battery, charging safety can be ensured, achieving improved charging efficiency while ensuring battery charging safety.

[0048] That is, by increasing the output voltage of the charging unit, the charging time of the battery during the constant current charging stage is increased, thereby increasing the charging speed of the battery.

[0049] For example, for a battery with a rated voltage of 4.35V and a rated current of 1A (i.e., a 4.35V system with a 1A charging current), assuming the charging circuit impedance is 200mΩ, if a typical charging scheme is used, the battery enters the constant voltage charging stage when the output voltage Vo of the charging unit is 4.35V, and enters the charging termination stage when the output current I of the charging unit drops to a preset charging cutoff current, for example, when the output current of the charging unit drops to 10mA. Therefore, when the battery transitions from the constant current charging stage to the constant voltage charging stage, the voltage V across the battery will be... bat =Vo - I * R = 4.35V - (1 * 0.2)V = 4.15V, meaning this battery can only be charged at a constant current to 4.15V before entering the constant voltage charging stage. After entering the constant voltage charging stage, the current will be as follows... Figure 2 As shown, the current gradually decreases to 10mA, and the charging rate gradually slows down.

[0050] By determining the output voltage of the charging unit based on the voltage drop of the charging circuit and the rated voltage of the battery, and ensuring that the output voltage of the charging unit is greater than the rated voltage of the battery, and that the voltage across the battery is less than or equal to the rated voltage when charging the battery based on this output voltage, the charging time of the battery in the constant current charging phase can be increased, that is, the charging time of the constant current charging phase can be extended. Therefore, the charging speed of the battery can be increased. Furthermore, in the embodiments of this application, when charging the battery based on this output voltage, since the voltage across the battery is less than or equal to the rated voltage of the battery, the charging safety of the battery can also be ensured, thereby improving the charging efficiency of the battery while ensuring the charging safety of the battery.

[0051] For example, for a battery with a rated voltage of 4.35V and a rated current of 1A (i.e., a 4.35V system with a 1A charging current), assuming the impedance of the charging circuit is 200mΩ, and if the output voltage of the charging unit is set to 4.53V, then when the battery transitions from the constant current charging stage to the constant voltage charging stage, the voltage V across the battery will be... bat =Vo-I*R=4.53V-(1*0.2)V=4.33V, that is, this battery can be charged at a constant current to 4.35V instead of 4.15V. Therefore, it can effectively extend the charging time of the constant current charging stage and improve the charging speed of the battery. Furthermore, by setting a reasonable charging cutoff current or by monitoring the voltage at both ends of the battery in real time, the voltage at both ends of the battery is less than or equal to the rated voltage of the battery when charging the battery based on the above output voltage, thereby ensuring the charging safety of the battery.

[0052] Optionally, in some embodiments of this application, in order to improve the charging speed of the battery while ensuring the charging safety of the battery, a reasonable charging cutoff current can be set so that when the battery is charged based on the above-mentioned output voltage, the voltage at both ends of the battery is less than or equal to the rated voltage of the battery, thereby ensuring the charging safety of the battery.

[0053] For example, such as Figure 5 The diagram shown is a second implementation flow chart of a charging control method provided in an embodiment of this application. This charging control method can be implemented using the following steps 501 to 504.

[0054] Step 501: Determine the first cutoff current of the battery based on the battery's rated current.

[0055] In this embodiment of the application, the first cutoff current is less than the rated current of the battery and greater than the second cutoff current. The second cutoff current is the current corresponding to when the battery's charge reaches a preset capacity, that is, the preset charging cutoff current. For example, the second cutoff current can be 10mA.

[0056] For example, for a battery with a rated voltage of 4.35V and a rated current of 1A (i.e., a 4.35V system with a 1A charging current), if the current (i.e., the second cutoff current) corresponding to the battery reaching its preset capacity is 10mA, then the aforementioned first cutoff current is less than the battery's rated current of 1A and greater than the second cutoff current of 10mA. For example, this first cutoff current can be 900mA, 800mA, or 700mA.

[0057] Step 502: Determine the minimum voltage drop of the charging line based on the first cutoff current.

[0058] Step 503 determines the maximum output voltage of the charging unit based on the minimum voltage drop of the charging circuit and the rated voltage of the battery.

[0059] Step 504: Charge the battery based on the maximum output voltage and the first cutoff current.

[0060] Since the voltage drop across the charging circuit is the product of the circuit's impedance R and the charging unit's output current I, I*R, after the battery enters the constant voltage charging stage, the charging unit's output current continuously decreases. Therefore, the voltage drop I*R across the charging circuit will also gradually decrease. When it decreases to the minimum voltage drop, that is, when I equals the first cutoff current I1, V bat =Vo-I1*R reaches its maximum. To ensure battery charging safety, V needs to be made so that... bat The maximum voltage cannot exceed the battery's rated voltage V. 额 Therefore, the maximum output voltage Vo of the charging unit needs to be determined based on the minimum voltage drop of the charging circuit and the rated voltage of the battery.额 +I1*R ensures that when charging the battery based on the maximum output voltage and the first cutoff current, the voltage across the battery terminals will not exceed the battery's rated voltage. Furthermore, under these conditions, the battery can achieve a voltage V during the constant current phase. bat =V 额 +I1*RI 额 R is greater than V bat =V 额 -I 额 R, thus can extend the charging time of the constant current charging stage and improve the charging speed of the battery.

[0061] For example, for a battery with a rated voltage of 4.35V and a rated current of 1A, if the impedance of the charging circuit is 0.2Ω and the first cutoff current is 800mA, then the maximum output voltage Vo = 4.35V + (0.8 * 0.2)V = 4.51V. Therefore, the voltage V across the battery during the constant current charging phase... bat =Vo-I*R=4.51-1*0.2=4.31V. Compared with the general charging scheme mentioned above, which can only reach 4.15V in the constant current charging stage, this can effectively extend the charging time of the constant current charging stage and improve the charging speed of the battery. Furthermore, when the battery is charged with an output voltage of 4.51V, when the battery enters the constant voltage charging stage and the voltage across the battery reaches 4.35V, the output current of the charging unit will drop to the first cutoff current of 800mA, and the battery charging will be cut off. Therefore, the voltage across the battery will not continue to increase, thus ensuring the charging safety of the battery.

[0062] However, when the voltage across the battery reaches 4.35V and the output current of the charging unit reaches the first cutoff current of 800mA, the battery is still not fully charged. Therefore, it is necessary to continue constant voltage charging of the battery.

[0063] Specifically, in some embodiments of this application, step 504 can be implemented using steps A01 to A02.

[0064] Step A01: Before the output voltage of the charging unit reaches the maximum output voltage, the battery is charged with constant current at the rated current.

[0065] Step A02: When the output voltage of the charging unit reaches the maximum output voltage, the battery is charged at the maximum output voltage under constant voltage until the output current of the charging unit drops to the first cutoff current. Then, the battery is charged at the rated voltage under constant voltage until the output current of the battery charging unit drops to the second cutoff current, thus completing the battery charging.

[0066] For example, such as Figure 6As shown, for a battery with a rated voltage of 4.35V and a rated current of 1A, if the impedance of the charging circuit is 0.2Ω, the first cutoff current is 800mA, and the second cutoff current is 10mA, then before the output voltage of the charging unit reaches the maximum output voltage of 4.51V, it indicates that the battery's charge is low. Therefore, when the battery voltage is greater than the pre-charge voltage threshold, the battery can be charged with a constant current of 1A at the rated current to achieve fast charging. After the output voltage of the charging unit reaches the maximum output voltage of 4.51V, in order to ensure the charging safety of the battery, the battery is charged with a constant voltage at the maximum output voltage of 4.51V until the output current of the charging unit drops to the first cutoff current of 800mA. Then, the battery is charged with a constant voltage at the rated voltage of 4.35V until the output current of the battery charging unit drops to the second cutoff current of 10mA, thus completing the battery charging.

[0067] Specifically, as shown in Table 1 below:

[0068]

[0069]

[0070] To further improve the charging speed of the battery, optionally, in some embodiments of this application, the first cutoff current can be set in stages, that is, the first cutoff current can include multiple sub-cutoff currents, for example, N sub-cutoff currents, where N is an integer greater than or equal to 2, so as to maximize the extension of fast charging time.

[0071] Correspondingly, such as Figure 7 As shown above, Figure 5 The charging control method shown can be implemented using the following steps 701 to 703.

[0072] Step 701: Determine the minimum voltage drop of the charging line corresponding to each of the N sub-cutoff currents on a one-to-one basis.

[0073] For example, if N=3, and the above N sub-cutoff currents are 900mA, 600mA, and 300mA respectively, then the minimum voltage drop of the charging line corresponding to 900mA is 900mA*0.2Ω=0.18V, the minimum voltage drop of the charging line corresponding to 600mA is 600mA*0.2Ω=0.12V, and the minimum voltage drop of the charging line corresponding to 300mA is 300mA*0.2Ω=0.06V.

[0074] Step 702: Based on the minimum voltage drop of the charging line corresponding to each sub-cutoff current, determine the maximum output voltage of the charging unit corresponding to each sub-cutoff current on a one-to-one basis.

[0075] For example, the maximum output voltage of the charging unit corresponding to a minimum voltage drop of 0.18V is 4.35V + 0.18V = 4.53V, the maximum output voltage of the charging unit corresponding to a minimum voltage drop of 0.12V is 4.35V + 0.12V = 4.47V, and the maximum output voltage of the charging unit corresponding to a minimum voltage drop of 0.06V is 4.35V + 0.06V = 4.41V.

[0076] Step 703: Charge the battery sequentially based on the N sub-cutoff currents in descending order and the maximum output voltage corresponding to each sub-cutoff current.

[0077] Following the examples above, in this embodiment, the battery charging process based on the N cutoff currents in descending order and the maximum output voltage corresponding to each sub-cutoff current can be divided into the following four stages:

[0078] In the first stage, before the output voltage of the charging unit reaches the maximum output voltage of 4.53V corresponding to the first sub-cutoff current of 900mA, the battery is charged with constant current at the rated current of 1A to achieve fast charging. After the output voltage of the charging unit reaches 4.53V, in order to ensure the charging safety of the battery, the battery is charged with constant voltage at 4.53V until the output current of the charging unit drops to the sub-cutoff current of 900mA corresponding to 4.53V.

[0079] In the second stage, after the output current of the charging unit drops to the sub-cutoff current of 900mA corresponding to 4.53V, the output voltage of the charging unit is reduced to the maximum output voltage of 4.47V corresponding to the second sub-cutoff current of 600mA. The battery is then charged at a constant voltage of 4.47V until the output current of the charging unit drops to the sub-cutoff current of 600mA corresponding to 4.47V.

[0080] In the third stage, after the output current of the charging unit drops to the sub-cutoff current of 600mA corresponding to 4.47V, the output voltage of the charging unit is reduced to the maximum output voltage of 4.41V corresponding to the third sub-cutoff current of 300mA. The battery is then charged at a constant voltage of 4.41V until the output current of the charging unit drops to the sub-cutoff current of 300mA corresponding to 4.41V.

[0081] In the fourth stage, after the output current of the charging unit drops to the sub-cutoff current of 300mA corresponding to 4.41V, since the minimum voltage drop of the charging circuit is already relatively small at this time, in order to ensure the charging safety of the battery, the output voltage of the charging unit can be reduced to the rated voltage of the battery, 4.35V, to perform constant voltage charging on the battery until the output current of the charging unit drops to the second cutoff current of 10mA, thus completing the battery charging.

[0082] In this embodiment of the application, by setting the first cutoff current in stages, that is, dividing the first cutoff current into multiple sub-cutoff currents, the fast charging time is extended to the maximum extent, thereby improving the charging speed of the battery.

[0083] It should be noted that the above is merely an example of dividing the first cutoff current into sub-cutoff currents. It is understood that, between the battery's rated current and the second cutoff current, any number of sub-cutoff currents can be used depending on the actual application scenario, and this application does not impose any restrictions on this. For example, the aforementioned first cutoff current can also be divided into two sub-cutoff currents: 800mA and 400mA.

[0084] Optionally, in some embodiments of this application, step 504 may also be implemented using steps B01 to B02.

[0085] Step B01: Obtain the target time for the output current of the charging unit to drop from the rated current to the first cutoff current;

[0086] Step B02: Before the output voltage of the charging unit reaches the maximum output voltage, the battery is charged at a constant current with the rated current.

[0087] Step B03: After the output voltage of the charging unit reaches the maximum output voltage, start calculating the battery charging time;

[0088] Step B04: When the charging time is less than the target time, the battery is charged at a constant voltage using the maximum output voltage.

[0089] Step B05: When the charging time is greater than or equal to the target time, the battery is charged at a constant voltage using the rated voltage until the output current of the battery charging unit drops to the second cutoff current.

[0090] Understandably, when the first cutoff current includes multiple sub-cutoff currents, the target time for the output current of the charging unit to decrease from the rated current to each sub-cutoff current can be determined separately, and the battery can be charged in multiple stages according to each target time to extend the fast charging time of the battery and improve the charging efficiency of the battery.

[0091] In addition to the above Figures 5 to 7In addition to improving the charging speed of the battery while ensuring charging safety by setting a reasonable charging cutoff current and the maximum output voltage corresponding to the charging cutoff current, as shown in some embodiments of this application, the output voltage of the charging unit can be adjusted by real-time monitoring of the voltage across the battery terminals. This ensures that when charging the battery based on the adjusted output voltage, the voltage across the battery terminals is less than or equal to the battery's rated voltage, while the output voltage of the charging unit is greater than the battery's rated voltage. This achieves the goal of improving the charging speed of the battery while ensuring charging safety.

[0092] Optional, such as Figure 8 The diagram shown is a fourth implementation flow diagram of the charging control method provided in this application embodiment. The charging control method can be implemented by the following steps 801 to 802.

[0093] Step 801: Adjust the output voltage of the charging unit based on the voltage drop of the charging circuit and the rated voltage of the battery to obtain the adjusted output voltage;

[0094] Step 802: Charge the battery based on the adjusted output voltage;

[0095] In this embodiment of the application, the above-mentioned adjustment of the output voltage of the charging unit based on the voltage drop of the charging line and the rated voltage of the battery to obtain the adjusted output voltage means: real-time detection of the output voltage of the charging unit, determining whether the detected output voltage needs to be adjusted based on the voltage drop of the charging line and the rated voltage of the battery, and calculating the adjusted output voltage based on the voltage drop of the charging line, the rated voltage of the battery and the detected output voltage when adjustment is required.

[0096] In this embodiment of the application, the adjusted output voltage is greater than the rated voltage of the battery, and when the battery is charged based on the adjusted output voltage, the voltage across the battery terminals is less than or equal to the rated voltage.

[0097] Optionally, the above adjustment of the output voltage of the charging unit based on the voltage drop of the charging line and the rated voltage of the battery can be achieved by the following steps C01 to C03.

[0098] Step C01: Detect the output voltage of the charging unit based on a preset detection time interval.

[0099] For example, such as Figure 9 As shown, by connecting the positive output terminal of the charging unit to the ADC1 port of the main controller, the output voltage of the charging unit can be detected in real time.

[0100] Step C02: Calculate the voltage across the battery terminals based on the voltage drop across the charging circuit and the output voltage.

[0101] Step C03: Adjust the output voltage of the charging unit based on the voltage at both ends of the battery and the rated voltage of the battery to obtain the adjusted output voltage.

[0102] In this embodiment of the application, the calculation method of the voltage drop of the charging line in step C03 can be divided into two categories: one is the case where the impedance of the charging line has been obtained through calibration, that is, the case where the impedance is known; the other is the case where the impedance of the charging line is unknown.

[0103] Optionally, in some embodiments of this application, when the impedance of the charging line is known, the voltage across the battery calculated based on the voltage drop and output voltage of the charging line can be achieved by the following steps C211 to C214.

[0104] Step C211: Obtain the impedance R of the charging line;

[0105] Step C212: Detect the output current I of the charging unit based on a preset detection time interval;

[0106] Step C213: Calculate the voltage drop I*R of the charging line based on the output current and the impedance of the charging line;

[0107] Step C214: Calculate the voltage V across the battery based on the voltage drop I*R of the charging circuit and the output voltage Vo. bat =Vo-I*R.

[0108] Optionally, in some embodiments of this application, when the impedance of the charging line is unknown, the voltage across the battery calculated based on the voltage drop and output voltage of the charging line can be achieved by the following steps C221 to C222, or by the following steps C231 to C232, or by the following steps C241 to C243.

[0109] Step C221: Based on the aforementioned preset detection time interval, detect the first voltage drop of the first charging sub-circuit in the charging circuit.

[0110] like Figure 9 As shown, the first charging sub-circuit mentioned above is the charging circuit between the output positive terminal of the charging unit and the positive terminal of the battery, that is, circuit 1.

[0111] In this embodiment of the application, the first voltage drop of the first charging sub-circuit in the charging circuit can be detected through the first detection circuit.

[0112] Optional, such as Figure 9As shown, the first detection circuit is used to connect the negative terminal of the charging unit to the ground port GND of the main controller, connect the positive output terminal of the charging unit to the port ADC1 of the main controller, and connect the positive terminal of the battery to the port ADC2 of the main controller to detect the voltage of line 1, i.e., the first voltage drop Vo-V. ADC2 .

[0113] Specifically, since the current in the connection between the positive terminal of the battery and the port ADC2 of the main controller is very small, the voltage drop in the connection between the positive terminal of the battery and the port ADC2 of the main controller can be ignored. Therefore, the voltage obtained is the voltage of line 1.

[0114] Step C222: Calculate the voltage across the battery terminals based on the first voltage drop and the output voltage.

[0115] In practical applications, the charging circuit includes a first charging sub-circuit and a second charging sub-circuit, wherein the second charging sub-circuit is the circuit between the negative terminal of the charging unit and the negative terminal of the battery, i.e., as shown in the figure. Figure 9 As shown in line 2, since the second charging sub-line in the charging line and the first charging sub-line in the charging line are parallel lines with the same wire diameter, the impedance of line 1 is equal to the impedance of line 2. Therefore, in this embodiment, the sum of the voltage drops of the first charging sub-line and the second charging sub-line is twice the first voltage drop.

[0116] Therefore, it can be based on the first voltage drop V ADC2 The voltage V across the battery is calculated from the output voltage Vo. bat =Vo-2(Vo-V ADC2 ) = 2V ADC2 -Vo.

[0117] Similarly, in some embodiments of this application, as shown in steps C231 to C232 below, the voltage across the battery can also be calculated by detecting the voltage of line 2, as detailed below:

[0118] Step C231: Based on a preset detection time interval, detect the second voltage drop of the second charging sub-circuit in the charging circuit.

[0119] The second voltage drop mentioned above can be detected through the second detection line.

[0120] Optional, such as Figure 10 As shown, the second detection circuit connects the negative terminal of the charging unit to the ground port GND of the main controller, connects the positive output terminal of the charging unit to the port ADC1 of the main controller, and connects the negative terminal of the battery to the port ADC3 of the main controller to detect the voltage of line 2, i.e., the second voltage drop Vo-V. ADC3 .

[0121] Step C232: Calculate the voltage V across the battery terminals based on the second voltage drop and the output voltage. bat =Vo-2(Vo-V ADC3 ) = 2V ADC3 -Vo.

[0122] In addition, for cases where the impedances of the first charging line and the second charging line are different, as shown in steps C241 to C243 below, the voltage across the battery can be obtained by detecting the positive and negative terminal voltages of the battery respectively. Then, based on the voltage across the battery and the rated voltage of the battery, the output voltage of the charging unit is adjusted to obtain the adjusted output voltage, as detailed below:

[0123] Step C241: Based on a preset detection time interval, detect the voltage of the positive terminal and the voltage of the negative terminal of the battery, and calculate the voltage across the battery terminals based on the voltage of the positive terminal and the voltage of the negative terminal of the battery.

[0124] The voltage of the positive terminal and the voltage of the negative terminal of the battery can be detected by the third detection circuit.

[0125] Optional, such as Figure 11 As shown, the third detection circuit connects the negative terminal of the charging unit to the ground port GND of the main controller and the positive terminal of the battery to the port ADC2 of the main controller to detect the voltage V at the positive terminal of the battery. ADC2 Then, by connecting the negative terminal of the battery to port ADC3 of the main controller, the voltage V at the negative terminal of the battery is detected. ADC3 Therefore, it can be determined based on the voltage V at the positive terminal of the battery. ADC2 And the voltage V at the negative terminal of the battery ADC3 The voltage V across the battery is calculated. bat =V ADC2 -V ADC3 .

[0126] Step C242: Adjust the output voltage of the charging unit based on the voltage at both ends of the battery and the rated voltage of the battery to obtain the adjusted output voltage;

[0127] Step C243: Charge the battery based on the adjusted output voltage;

[0128] In this embodiment of the application, the adjusted output voltage is greater than the rated voltage of the battery, and when the battery is charged based on the adjusted output voltage, the voltage across the battery terminals is less than or equal to the rated voltage of the battery.

[0129] It should be noted that in steps C03 and C243 above, when charging the battery based on the adjusted output voltage, it is only necessary to increase the output voltage of the charging unit as much as possible while ensuring the battery charging safety, provided that the adjusted output voltage is greater than the battery's rated voltage and the voltage across the battery terminals is less than or equal to the battery's rated voltage.

[0130] Understandably, the first detection line, the second detection line, the third detection line, and the charging line mentioned above can all be connected by wires (which can be set along the neckband, for example, encapsulated in the neckband cable).

[0131] In the embodiments of this application, the preset time intervals in the above-described implementation methods can be set according to the actual application scenario, and this application does not impose any restrictions on them.

[0132] In this application, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions. In some embodiments of this application, certain steps may be performed in other orders.

[0133] Figure 12 A schematic diagram of a charging control device 120 provided in an embodiment of this application is shown. The charging control device is configured in a terminal containing a battery charging circuit and includes a determination unit 121 and a charging unit 122.

[0134] The determining unit 121 is used to determine the output voltage of the charging unit based on the voltage drop of the charging line and the rated voltage of the battery; wherein, the charging line is the line between the charging unit and the battery;

[0135] The charging unit 122 is used to charge the battery based on the output voltage; the output voltage is greater than the rated voltage, and when charging the battery based on the output voltage, the voltage across the battery is less than or equal to the rated voltage.

[0136] Optionally, in some embodiments of this application, the aforementioned determining unit is specifically used for:

[0137] The first cutoff current of the battery is determined based on the rated current of the battery, wherein the first cutoff current is less than the rated current and greater than the second cutoff current, and the second cutoff current is the current corresponding to when the battery's charge reaches the preset capacity.

[0138] The minimum voltage drop of the charging circuit is determined based on the first cutoff current;

[0139] The maximum output voltage of the charging unit is determined based on the minimum voltage drop of the charging circuit and the rated voltage of the battery.

[0140] The aforementioned charging unit is specifically used for:

[0141] The battery is charged based on the maximum output voltage and the first cutoff current.

[0142] Optionally, in some embodiments of this application, the above-mentioned charging unit is specifically used for:

[0143] The battery is charged at a constant current at the rated current before the output voltage of the charging unit reaches the maximum output voltage.

[0144] When the output voltage of the charging unit reaches the maximum output voltage, the battery is charged at the maximum output voltage under constant voltage until the output current of the charging unit drops to the first cutoff current. Then, the battery is charged at the rated voltage under constant voltage until the output current of the battery charging unit drops to the second cutoff current.

[0145] Optionally, in some embodiments of this application, the above-mentioned charging unit is specifically used for:

[0146] The target time for the output current of the charging unit to drop from the rated current to the first cutoff current is obtained;

[0147] Before the output voltage of the charging unit reaches the maximum output voltage, the battery is charged at a constant current with the rated current.

[0148] Calculate the battery charging time after the charging unit's output voltage reaches its maximum output voltage;

[0149] When the charging time is less than the target time, the battery is charged at a constant voltage using the maximum output voltage.

[0150] When the charging time is greater than or equal to the target time, the battery is charged at a constant voltage with the rated voltage until the output current of the battery charging unit drops to the second cutoff current.

[0151] Optionally, in some embodiments of this application, the first cutoff current includes N sub-cutoff currents, where N is an integer greater than or equal to 2; the determining unit is specifically used for:

[0152] The minimum voltage drop of the charging circuit corresponding to each of the N sub-cutoff currents is determined on a one-to-one basis.

[0153] Based on the minimum voltage drop of the charging line corresponding to each sub-cutoff current, the maximum output voltage of the charging unit corresponding to each sub-cutoff current is determined one-to-one.

[0154] The aforementioned charging unit is specifically used for:

[0155] The battery is charged sequentially based on the N sub-cutoff currents in descending order and the maximum output voltage corresponding to each sub-cutoff current.

[0156] Optionally, in some embodiments of this application, the aforementioned determining unit is specifically used for:

[0157] The output voltage of the charging unit is adjusted based on the voltage drop of the charging circuit and the rated voltage of the battery to obtain the adjusted output voltage.

[0158] The aforementioned charging unit is specifically used for:

[0159] The battery is charged based on the adjusted output voltage;

[0160] Specifically, the adjusted output voltage is greater than the rated voltage, and when the battery is charged based on the adjusted output voltage, the voltage across the battery terminals is less than or equal to the rated voltage.

[0161] Optionally, in some embodiments of this application, the aforementioned determining unit is specifically used for:

[0162] The output voltage of the charging unit is detected based on a preset detection time interval.

[0163] The voltage across the battery is calculated based on the voltage drop across the charging circuit and the output voltage.

[0164] The output voltage of the charging unit is adjusted based on the voltage at both ends of the battery and the battery's rated voltage to obtain the adjusted output voltage.

[0165] Optionally, in some embodiments of this application, the aforementioned determining unit is further specifically used for:

[0166] Obtain the impedance of the charging line;

[0167] The output current of the charging unit is detected based on a preset detection time interval.

[0168] The voltage drop of the charging line is calculated based on the output current and the impedance of the charging line.

[0169] The voltage across the battery is calculated based on the voltage drop across the charging circuit and the output voltage.

[0170] Optionally, in some embodiments of this application, the aforementioned determining unit is further specifically used for:

[0171] Based on a preset detection time interval, the first voltage drop of the first charging sub-circuit in the charging circuit is detected; the first charging sub-circuit is the circuit between the positive terminal of the charging unit and the positive terminal of the battery.

[0172] The voltage across the battery is calculated based on the first voltage drop and the output voltage.

[0173] Optionally, in some embodiments of this application, the aforementioned determining unit is further specifically used for:

[0174] Based on a preset detection time interval, the second voltage drop of the second charging sub-circuit in the charging circuit is detected; the second charging sub-circuit is the circuit between the negative terminal of the charging unit and the negative terminal of the battery.

[0175] The voltage across the battery is calculated based on the second voltage drop and the output voltage.

[0176] Optionally, in some embodiments of this application, the aforementioned determining unit is specifically used for:

[0177] Based on a preset detection time interval, the voltage of the positive terminal and the voltage of the negative terminal of the battery are detected, and the voltage at both ends of the battery is calculated based on the voltage of the positive terminal and the voltage of the negative terminal.

[0178] The output voltage of the charging unit is adjusted based on the voltage across the battery terminals and the battery's rated voltage to obtain the adjusted output voltage.

[0179] Optionally, in some embodiments of this application, the above-mentioned charging unit is specifically used for:

[0180] The battery is charged based on the adjusted output voltage;

[0181] Specifically, the adjusted output voltage is greater than the rated voltage, and when the battery is charged based on the adjusted output voltage, the voltage across the battery terminals is less than or equal to the rated voltage.

[0182] It should be noted that, for the sake of convenience and brevity, the specific working process of the charging control device 120 described above can be referred to the above... Figures 1 to 11 The corresponding process of the Chinese method will not be elaborated here.

[0183] For example, embodiments of this application also provide a chip, which includes a processor for reading and executing a computer program stored in a memory to achieve the above-mentioned functions. Figure 1-11 The charging control method shown.

[0184] It should be noted that the aforementioned chip can be either the charging management chip or the main controller, i.e., a chip independent of the charging management chip.

[0185] For example, this application also provides a terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described... Figure 1-11The charging control method shown.

[0186] The processor mentioned above can be the main controller in the charging unit, or it can be the charging unit itself.

[0187] Optionally, the aforementioned terminal can be a neckband-style headset. The neckband-style headset includes a charging unit and a battery, which are located at opposite ends of the neckband portion of the headset and connected via a charging circuit. The charging unit is used to charge the battery.

[0188] For example, the charging unit is located in such Figure 3 The battery is located on the left end of the neckband headphones shown. Figure 3 The right end of the neckband headphones shown, or the charging unit is located as follows: Figure 3 The battery is located on the right end of the neckband headphones shown. Figure 3 The left end of the neckband headphones shown.

[0189] In this embodiment, the neckband-style headphones described above are a product between true wireless headphones and wired headphones. In terms of design, its neckband portion (e.g., the neck strap) has sufficient space to house the battery and decoding amplifier circuitry; therefore, generally speaking, it can provide longer battery life and a better sound quality experience than true wireless headphones.

[0190] Another major difference between neckband headphones and wired headphones is that, for consumer users, audio source devices such as mobile phones, due to their own interference issues, generate a lot of noise when decoding and amplifying voice data before sending it to wired headphones for playback. Neckband headphones, on the other hand, do not require audio source devices like mobile phones to decode and amplify the voice data; instead, they directly transmit the voice data to the headphones wirelessly via Bluetooth, avoiding the noise problems caused by audio source devices.

[0191] Based on the above advantages, neckband headphones are loved by many users.

[0192] However, to reduce the size of neckband headphones, the battery and mainboard are located on the left and right sides of the headphones (i.e., at both ends of the neckband), respectively, and connected via charging lines (which can be installed along the neckband). Because there is a certain distance between the two, a large impedance is generated on the charging lines, resulting in a voltage drop.

[0193] This application determines the output voltage of the charging unit based on the voltage drop of the charging circuit and the rated voltage of the battery. Furthermore, this output voltage is greater than the rated voltage of the battery, thus compensating for the voltage drop of the charging circuit. This increases the charging time of the battery during the constant current charging phase, thereby extending the charging time of the constant current charging phase and improving the charging speed of the battery. In addition, in the embodiments of this application, when charging the battery based on this output voltage, since the voltage across the battery is less than or equal to the rated voltage of the battery, charging safety can be ensured, achieving improved charging efficiency while ensuring battery charging safety.

[0194] Optionally, in some embodiments of this application, the terminal may further include the first detection line, which is used to detect the first voltage drop of the first charging sub-line in the charging line.

[0195] Optionally, in some embodiments of this application, the terminal may further include the second detection line, which is used to detect the second voltage drop of the second charging sub-circuit in the charging circuit.

[0196] Optionally, in some embodiments of this application, the terminal may further include the aforementioned third detection line, which is used to detect the voltage of the positive terminal and the voltage of the negative terminal of the battery.

[0197] For example, embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described... Figure 1-11 The charging control method shown.

[0198] Optionally, in this embodiment, the processor can be a central processing unit, or it can be other general-purpose processors, digital signal processors, application-specific integrated circuits, field-programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0199] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units is merely an example. In practical applications, the above functions can be assigned to different functional units or modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0200] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0201] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the charging control method. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0202] In the embodiments provided in this application, it should be understood that the disclosed devices / user terminals and methods can be implemented in other ways. For example, the device / user terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0203] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0204] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0205] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0206] The above embodiments are only used to illustrate the charging control method of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the charging control methods described in the foregoing embodiments, or equivalent substitutions can be made to some of the method features. Such modifications or substitutions do not cause the essence of the corresponding charging control method to deviate from the spirit and scope of the charging control methods of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A charging control method, characterized in that, The charging control method includes: The first cutoff current of the battery is determined based on the rated current of the battery, wherein the first cutoff current is less than the rated current and greater than the second cutoff current, and the second cutoff current is the current corresponding to when the battery's charge reaches a preset capacity. The minimum voltage drop of the charging line is determined based on the first cutoff current; The maximum output voltage of the charging unit is determined based on the minimum voltage drop of the charging line and the rated voltage of the battery; wherein, the charging line is the line between the charging unit and the battery; The battery is charged based on the maximum output voltage and the first cutoff current; the maximum output voltage is greater than the rated voltage, and when the battery is charged based on the maximum output voltage, the voltage across the battery is less than or equal to the rated voltage; Charging the battery based on the maximum output voltage and the first cutoff current includes: Before the output voltage of the charging unit reaches the maximum output voltage, the battery is charged with constant current at the rated current. When the output voltage of the charging unit reaches the maximum output voltage, the battery is charged at the maximum output voltage under constant voltage until the output current of the charging unit drops to the first cutoff current. Then, the battery is charged at the rated voltage under constant voltage until the output current of the battery charging unit drops to the second cutoff current.

2. The charging control method as described in claim 1, characterized in that, Charging the battery based on the maximum output voltage and the first cutoff current includes: The target time for the output current of the charging unit to drop from the rated current to the first cutoff current is obtained; Before the output voltage of the charging unit reaches the maximum output voltage, the battery is charged with constant current at the rated current. After the output voltage of the charging unit reaches the maximum output voltage, the charging time of the battery is recorded. When the charging time is less than the target time, the battery is charged at a constant voltage using the maximum output voltage; When the charging duration is greater than or equal to the target duration, the battery is charged at a constant voltage using the rated voltage until the output current of the battery charging unit drops to the second cutoff current.

3. The charging control method as described in claim 1, characterized in that, The first cutoff current includes N sub-cutoff currents, where N is an integer greater than or equal to 2; Determining the minimum voltage drop of the charging line based on the first cutoff current includes: The minimum voltage drop of the charging circuit corresponding to each of the N sub-cutoff currents is determined one-to-one. Determining the maximum output voltage of the charging unit based on the minimum voltage drop of the charging circuit and the rated voltage of the battery includes: Based on the minimum voltage drop of the charging line corresponding to each sub-cutoff current, the maximum output voltage of the charging unit corresponding to each sub-cutoff current is determined one-to-one; The charging of the battery based on the output voltage includes: The battery is charged sequentially based on the N sub-cutoff currents in descending order and the maximum output voltage corresponding to each sub-cutoff current.

4. The charging control method as described in claim 1, characterized in that, Also includes: The output voltage of the charging unit is detected based on a preset detection time interval; The voltage across the battery is calculated based on the voltage drop across the charging circuit and the output voltage. The output voltage of the charging unit is adjusted based on the voltage across the battery terminals and the battery's rated voltage to obtain the adjusted output voltage. The battery is charged based on the adjusted output voltage; wherein the adjusted output voltage is greater than the rated voltage, and when the battery is charged based on the adjusted output voltage, the voltage across the battery is less than or equal to the rated voltage.

5. The charging control method as described in claim 4, characterized in that, The calculation of the voltage across the battery based on the voltage drop of the charging line and the output voltage includes: Obtain the impedance of the charging line; The output current of the charging unit is detected based on the preset detection time interval; The voltage drop of the charging line is calculated based on the output current and the impedance of the charging line. The voltage across the battery is calculated based on the voltage drop across the charging circuit and the output voltage.

6. The charging control method as described in claim 4, characterized in that, The calculation of the voltage across the battery based on the voltage drop of the charging line and the output voltage includes: Based on the preset detection time interval, the first voltage drop of the first charging sub-circuit in the charging circuit is detected; the first charging sub-circuit is the circuit between the positive terminal of the charging unit and the positive terminal of the battery. The voltage across the battery is calculated based on the first voltage drop and the output voltage.

7. The charging control method as described in claim 4, characterized in that, The calculation of the voltage across the battery based on the voltage drop of the charging line and the output voltage includes: Based on the preset detection time interval, the second voltage drop of the second charging sub-circuit in the charging circuit is detected; the second charging sub-circuit is the circuit between the negative terminal of the charging unit and the negative terminal of the battery. The voltage across the battery is calculated based on the second voltage drop and the output voltage.

8. A charging control device, characterized in that, include: A determining unit is configured to determine a first cutoff current of the battery based on the battery's rated current, wherein the first cutoff current is less than the rated current and greater than a second cutoff current, the second cutoff current being the current corresponding to when the battery's charge reaches a preset capacity; determine a minimum voltage drop of the charging circuit based on the first cutoff current; and determine a maximum output voltage of the charging unit based on the minimum voltage drop of the charging circuit and the battery's rated voltage; wherein the charging circuit is the circuit between the charging unit and the battery. A charging unit is used to charge the battery based on the maximum output voltage and the first cutoff current; The charging unit is specifically used for: charging the battery with the rated current at a constant current before the output voltage of the charging unit reaches the maximum output voltage; charging the battery with the maximum output voltage at a constant voltage when the output voltage of the charging unit reaches the maximum output voltage, until the output current of the charging unit drops to the first cutoff current, and then charging the battery with the rated voltage at a constant voltage, until the output current of the battery charging unit drops to the second cutoff current; wherein the maximum output voltage is greater than the rated voltage, and when charging the battery based on the maximum output voltage, the voltage across the battery is less than or equal to the rated voltage.

9. A chip comprising a processor for reading and executing a computer program stored in a memory to implement the steps of the method as claimed in any one of claims 1-7.

10. A terminal, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method as described in any one of claims 1-7.

11. The terminal as described in claim 10, characterized in that, The terminal is a neckband-style headset.

12. The terminal as described in claim 11, characterized in that, The neckband headphones include the charging unit and the battery. The charging unit and the battery are located at opposite ends of the neckband portion of the neckband headphones and are connected by a charging circuit. The charging unit is used to charge the battery.

13. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-7.

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