Terminal power supply control method, power supply controller and terminal

Abstract

This application provides a power supply control method, power supply controller, and terminal for a terminal. The method is applicable to the terminal's battery system, which includes a fast charging module, a voltage conversion module, a regular charging module, a first battery, a second battery, a first switching transistor, and a second switching transistor. When the voltage of the first and second batteries is less than or equal to a first voltage threshold, the fast charging module charges the first and second batteries in series, and the voltage conversion module converts the output voltage of the series-connected first and second batteries into a target voltage to supply power to the terminal load. When the voltage of either the first or second battery is greater than or equal to a second voltage threshold, and the voltage difference between the first and second batteries is less than a mutual charging threshold, the regular charging module charges the first and second batteries in parallel. Using this application can improve charging efficiency and reduce heat generation during the charging process.

Description

Technical Field

[0001] This application relates to the field of electronic power technology, and in particular to a power supply control method, power supply controller and terminal for a terminal. Background Technology

[0002] With the increasing charging power of consumer electronics products such as mobile phones, traditional single-battery power supply structures are struggling to support the high-power charging characteristics of these products, prompting dual-battery power supply structures to become a new direction in product design. Dual-battery power supply structures are suitable for high-power charging scenarios. Currently, dual-battery power supply structures are mainly divided into series dual-battery structures and parallel dual-battery structures. The inventors of this application discovered during their research and practice that in the prior art, such as... Figure 1 As shown, in the series dual-battery structure, batteries A1 and A2 are connected in series to power the terminal equipment system. However, the series dual-battery structure requires a voltage equalization circuit (such as one that controls voltage). Figure 1 The use of switches B1 and B2 in the series dual-battery structure is easily limited by product size, resulting in slow voltage equalization and low charging efficiency. Furthermore, the series dual-battery structure requires an additional step-down circuit, and the energy conversion by the step-down circuit leads to battery energy waste, affecting the battery life of the terminal device. Due to the characteristics of series circuits, once one battery in a series dual-battery structure is depleted, even if the other battery has power, it cannot continue to provide power, degrading the user experience. Compared to the series dual-battery structure, in situations such as... Figure 2 In the parallel dual-battery structure shown, the operating current doubles under the same charging power, increasing the probability of motherboard overheating. In small terminal devices, motherboard overheating reduces the charging power. Furthermore, if the line impedance difference between the two batteries in the parallel dual-battery structure is significant, additional bias current protection measures are required to mitigate the impact of bias current, increasing design costs and resulting in poor power supply stability for the terminal device. Summary of the Invention

[0003] This application provides a power supply control method, power supply controller, and terminal, which can improve charging efficiency, reduce heat generation during charging, and features a simple circuit structure, high circuit stability, flexible operation, and high applicability.

[0004] In a first aspect, this application provides a power supply control method for a terminal, applicable to the terminal's battery system. The battery system includes a fast charging module, a voltage conversion module, a regular charging module, a first battery, a second battery, a first switching transistor, and a second switching transistor. One end of the fast charging module is coupled to an external power source, and the other end is connected to the positive terminal of the first battery and one end of the voltage conversion module. The other end of the voltage conversion module is connected to the terminal load. The positive terminal of the first battery is connected to the terminal load via the regular charging module. The negative terminal of the first battery is connected to the positive terminal of the second battery via the first switching transistor and grounded via the second switching transistor. The positive terminal of the second battery is connected to the terminal load via the regular charging module, and the negative terminal of the second battery is grounded. The other end of the regular charging module is coupled to the external power source. The method includes: when the voltage of the first battery and the second battery is less than or equal to a first voltage threshold, closing the first switching transistor and opening the second switching transistor, disconnecting the regular charging module from the first battery, the second battery, and the external power source, and charging the first battery and the second battery in series via the fast charging module. At this point, the terminal load can be powered by the first and second batteries connected in series. A voltage conversion module can convert the output voltage of the first and second batteries connected in series into a target voltage to power the terminal load. Here, the target voltage can be the voltage required by the terminal load, or the supply voltage when a single battery powers the terminal load, such as 4V (the output voltage of the first and second batteries connected in series could be 8V). Simultaneously, if the power of the external power supply (e.g., a charger) is greater than the charging power of the first and second batteries connected in series, and there is still sufficient power to power the terminal load, a fast charging module can be used to power the terminal load. When the voltage of the first or second battery is greater than or equal to a second voltage threshold, and the voltage difference between the first and second batteries is less than the mutual charging threshold, the connection between the ordinary charging module and the first battery, the second battery, and the external power supply is connected. The connection between the first battery and the voltage conversion module and the external power supply is disconnected. The first switch is turned off and the second switch is turned on. The ordinary charging module charges the first and second batteries in parallel, simultaneously powering the terminal load through the parallel connection of the first and second batteries. Here, the second voltage threshold is greater than or equal to the first voltage threshold. Meanwhile, if the power of the external power source (such as a charger) (i.e., the charging power of the external power source) is greater than the power of the first and second batteries charging in parallel, and there is still enough power to supply power to the terminal load, the terminal load can be supplied through a regular charging module.

[0005] In the embodiments provided in this application, the first and second batteries can be charged in series or in parallel depending on their respective capacities. Series charging is used when the capacities are low to improve charging efficiency, while parallel charging is used when the capacities are high, resulting in a smaller charging current and reduced heat generation. Furthermore, the power of the charger can be used to power the terminal load via an external power source and / or the battery, enhancing the applicability of the battery system.

[0006] In conjunction with the first aspect, in a first possible implementation, the method further includes: when the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the connection between the ordinary charging module and the second battery is connected, and the connection between the first battery and the voltage conversion module is disconnected. Before switching to parallel charging of the first battery and the second battery, the first battery can be supplemented with charging. Here, the first switching transistor can be disconnected and the second switching transistor can be closed, and the first battery can be charged through the fast charging module. At the same time, the second battery supplies power to the terminal load until the voltage difference between the first battery and the second battery is less than the aforementioned mutual charging threshold. When the second battery supplies power to the terminal load, the current can flow through the ordinary charging module. This implementation can ensure that a battery supplies power to the terminal load while supplementing the charging of the first battery, prioritizing the power supply to the terminal load. Meanwhile, before switching to parallel charging of the first and second batteries, the first battery is supplemented with charging through a fast charging module using an external power source, which reduces the voltage difference between the first and second batteries, thereby ensuring that the mutual charging current between the first and second batteries is within a limited value when they are connected in parallel, thus protecting the circuit components.

[0007] In conjunction with the first aspect, in a second possible implementation, the method further includes: when the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the second battery can be discharged before switching to parallel charging of the first battery and the second battery. Here, the connection between the ordinary charging module and the second battery can be connected, the connection between the first battery and the voltage conversion module and the external power supply can be disconnected, the first switching transistor can be disconnected and the second switching transistor can be closed, and power can be supplied to the terminal load through the second battery. This implementation can use the second battery to supply power to the terminal load before switching to parallel charging of the first battery and the second battery, reducing the voltage difference between the first battery and the second battery until the voltage difference between the first battery and the second battery is less than the aforementioned mutual charging threshold, ensuring that the mutual charging current is within a limited value when the first battery and the second battery are connected in parallel, thus protecting the circuit components.

[0008] In conjunction with the first aspect, in a third possible implementation, the method further includes: when the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, and the voltage of the first battery is greater than the voltage of the second battery, the second battery can be supplementally charged before switching to parallel charging of the first battery and the second battery. Here, the connection between the ordinary charging module, the second battery, and the external power supply can be connected; the connection between the first battery and the voltage conversion module and the external power supply can be disconnected; the first switching transistor can be disconnected and the second switching transistor can be closed; the second battery can be charged through the ordinary charging module, and at the same time, the terminal load can be powered through the second battery until the voltage difference between the first battery and the second battery is less than the aforementioned mutual charging threshold. When the second battery powers the terminal load, the current can flow through the ordinary charging module. This implementation allows the second battery to power the terminal load before switching to parallel charging of the first battery and the second battery, while the second battery is supplementally charged through the ordinary charging module using an external power supply, reducing the voltage difference between the first battery and the second battery, thereby ensuring that the mutual charging current is within a limited value when the first battery and the second battery are connected in parallel, protecting circuit components.

[0009] In conjunction with the first aspect, in a fourth possible implementation, the battery system further includes a current-limiting module and a third switch. One end of the current-limiting module is connected to the positive terminal of the first battery, and the other end of the current-limiting module is connected to the positive terminal of the second battery through the third switch. The method further includes: when the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, and the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, connecting the ordinary charging module to the second battery, disconnecting the first battery from the voltage conversion module and the external power supply, disconnecting the first switch, and closing the second and third switches to allow the first battery and the second battery to be connected in parallel through the current-limiting module, and supplying power to the terminal load through the parallel connection of the first battery and the second battery until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. Here, the current-limiting module is used to share the voltage difference between the first battery and the second battery to limit the mutual charging current between the first battery and the second battery. This implementation can utilize a current limiting module to share the voltage difference between the first and second batteries when the voltage difference is too large, thereby limiting the mutual charging current when the first and second batteries are connected in parallel, and ensuring that the mutual charging current is within the limit value, thus protecting the circuit components.

[0010] In conjunction with any of the first to fourth possible implementations of the first aspect, in the fifth possible implementation, after charging the first and second batteries via a conventional charging module, the method further includes: stopping the conventional charging module from charging the first and second batteries when the voltage of the first and second batteries is greater than or equal to a full-charge threshold and the charging current of the first and second batteries is less than a second current threshold. This implementation can stop charging the first and second batteries via an external power source when they are fully charged, avoiding overcharging and extending battery life.

[0011] In conjunction with the fifth possible implementation of the first aspect, in the sixth possible implementation, the method further includes: when the voltages of both the first battery and the second battery are less than a third voltage threshold, closing the first switch, opening the second switch, and connecting the first battery and the voltage conversion module, while disconnecting the ordinary charging module from the first and second batteries, so as to supply power to the terminal load through the series connection of the first and second batteries. When the voltages of both batteries are less than the third voltage threshold, the terminal load is at risk of power loss. This implementation can ensure the power supply to the terminal load by increasing the battery supply voltage through the series connection of the first and second batteries.

[0012] In conjunction with the sixth possible implementation of the first aspect, in the seventh possible implementation, the third voltage threshold is determined by the parallel operating current I of the first and second batteries, the internal resistance R of the parallel connection of the first and second batteries, the maximum power consumption current Imax of the terminal load, and the power-down voltage Vdown of the terminal load. This implementation can dynamically determine the third voltage threshold according to the battery's operating environment and aging state, further ensuring the power supply to the terminal load and improving the battery's energy utilization rate.

[0013] In conjunction with the seventh possible implementation of the first aspect, in the eighth possible implementation, the third voltage threshold satisfies:

[0014] V = Vdown + (Imax - I) * R

[0015] Here, V is the third voltage threshold, Vdown is the power-down voltage, Imax is the maximum power consumption current, I is the parallel operating current, and R is the internal resistance of the parallel battery. This implementation can dynamically determine the third voltage threshold based on the battery's operating environment and aging state. It switches between the first and second batteries to power the terminal load based on the third voltage threshold and battery voltage, simplifying operation and further ensuring power supply to the terminal load while improving battery energy utilization.

[0016] In conjunction with the first aspect or any of the first to eighth possible embodiments of the first aspect, in the ninth possible embodiment, the battery system further includes a fourth switching transistor. The fourth switching transistor is connected between the fast charging module and the external power supply, or between the positive terminal of the first battery and the fast charging module, or integrated into the fast charging module. The connection position of the fourth switching transistor is flexible and highly adaptable. Disconnecting the first battery from the external power supply includes disconnecting the fourth switching transistor to disconnect the first battery from the external power supply. This embodiment can control the connection and disconnection of the first battery from the external power supply through the fourth switching transistor, making operation simple and flexible.

[0017] In conjunction with the ninth possible implementation of the first aspect, in the tenth possible implementation, the battery system further includes a fifth switching transistor. This fifth switching transistor is connected between the positive terminal of the first battery and the voltage conversion module, or integrated into the voltage conversion module. The connection position of the fifth switching transistor is flexible and highly adaptable. Disconnecting or connecting the first battery and the voltage conversion module includes: disconnecting or closing the fifth switching transistor to disconnect or connect the first battery and the voltage conversion module. This implementation allows control of the connection and disconnection between the first battery and the voltage conversion module via the fifth switching transistor, making operation simple and flexible.

[0018] In conjunction with the ninth or tenth possible implementation of the first aspect, in the eleventh possible implementation, the battery system further includes a sixth switch. The sixth switch is connected between the positive terminal of the first battery and the ordinary charging module, or integrated into the ordinary charging module. The connection position of the sixth switch is flexible and highly adaptable. Disconnecting or connecting the first battery and the ordinary charging module includes: disconnecting or closing the sixth switch to disconnect or connect the first battery and the ordinary charging module. This implementation allows control of the connection and disconnection between the first battery and the ordinary charging module via the sixth switch, making operation simple and flexible.

[0019] In conjunction with any of the ninth to eleventh possible embodiments of the first aspect, in the twelfth possible embodiment, the battery system further includes a seventh switch. The seventh switch is connected between the positive terminal of the second battery and the ordinary charging module, or integrated into the ordinary charging module. The connection position of the seventh switch is flexible and highly adaptable. Disconnecting or connecting the second battery and the ordinary charging module includes: disconnecting or closing the seventh switch to disconnect or connect the second battery and the ordinary charging module. This embodiment can control the connection and disconnection of the second battery and the ordinary charging module through the seventh switch, making operation simple and flexible.

[0020] In conjunction with any of the ninth to twelfth possible embodiments of the first aspect, in the thirteenth possible embodiment, the battery system further includes an eighth switching transistor. This eighth switching transistor is connected between the ordinary charging module and the external power supply, or integrated into the ordinary charging module. The connection position of the eighth switching transistor is flexible and highly adaptable. Disconnecting or connecting the ordinary charging module and the external power supply includes: disconnecting or closing the eighth switching transistor to disconnect or connect the ordinary charging module and the external power supply. This embodiment can control the connection and disconnection of the ordinary charging module and the external power supply through the eighth switching transistor, making operation simple and flexible.

[0021] Secondly, this application provides a power supply controller for a terminal. This power supply controller is suitable for use with the terminal's battery system, which includes a fast charging module, a voltage conversion module, a regular charging module, a first battery, a second battery, a first switching transistor, and a second switching transistor. Here, one end of the fast charging module is coupled to an external power source, and the other end of the fast charging module is connected to the positive terminal of the first battery and one end of the voltage conversion module. The other end of the voltage conversion module is connected to the terminal load. The positive terminal of the first battery is connected to the terminal load through the regular charging module. The negative terminal of the first battery is connected to the positive terminal of the second battery through the first switching transistor and grounded through the second switching transistor. The positive terminal of the second battery is connected to the terminal load through the regular charging module, and the negative terminal of the second battery is grounded. The other end of the regular charging module is coupled to the external power source. When the voltage of the first and second batteries is less than or equal to a first voltage threshold, the power supply controller can close the first switching transistor and open the second switching transistor, disconnecting the regular charging module from the first battery, the second battery, and the external power source, and controlling the fast charging module to charge the first and second batteries in series. At this time, the power supply controller can control the first and second batteries to be connected in series to supply power to the terminal load, and can control the voltage conversion module to convert the output voltage of the first and second batteries connected in series into a target voltage to supply power to the terminal load. Here, the target voltage can be the voltage required by the terminal load, or the supply voltage when a single battery supplies power to the terminal load, such as 4V (the output voltage of the first and second batteries connected in series can be 8V). Simultaneously, if the power of the external power supply (such as a charger) (i.e., the charging power of the external power supply) is greater than the charging power of the first and second batteries connected in series, and there is still sufficient power to supply power to the terminal load, the power supply controller can control the fast charging module to supply power to the terminal load. When the voltage of the first or second battery is greater than or equal to a second voltage threshold, and the voltage difference between the first and second batteries is less than the mutual charging threshold, the power supply controller can connect the ordinary charging module to the first battery, the second battery, and the external power supply, disconnect the first battery from the voltage conversion module and the external power supply, disconnect the first switching transistor and close the second switching transistor, and control the ordinary charging module to charge the first and second batteries. Here, the second voltage threshold is greater than or equal to the first voltage threshold. Meanwhile, if the power of the external power source (such as a charger) (i.e., the charging power of the external power source) is greater than the power of the first and second batteries charging in parallel, and there is still enough power to supply the terminal load, the power supply controller can supply the terminal load through a normal charging module.

[0022] In the embodiments provided in this application, the power supply controller can select to control the batteries to be charged in series or in parallel based on the charge levels of the first and second batteries. Series charging is used when the charge level is low to improve charging efficiency, while parallel charging is used when the charge level is high, resulting in a smaller charging current and reduced heat generation. Simultaneously, the controller can determine whether to supply power to the terminal load via an external power source and / or the battery based on the charger's power output, enhancing the applicability of the battery system.

[0023] In conjunction with the second aspect, in the first possible implementation, when the voltage of the first or second battery is greater than a second voltage threshold, the charging current of the first and second batteries is less than a first current threshold, the voltage difference between the first and second batteries is greater than or equal to the mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the power supply controller can supplement the charging of the first battery before switching to parallel charging of the first and second batteries. Here, the power supply controller can connect the ordinary charging module and the second battery, disconnect the connection between the first battery and the voltage conversion module, disconnect the first switching transistor and close the second switching transistor, and charge the first battery through the fast charging module. Simultaneously, the second battery supplies power to the terminal load until the voltage difference between the first and second batteries is less than the mutual charging threshold. When the second battery supplies power to the terminal load, current can flow through the ordinary charging module. This implementation ensures that a battery supplies power to the terminal load while supplementing the charging of the first battery, prioritizing the power supply to the terminal load. Meanwhile, before switching to parallel charging of the first and second batteries, the first battery is supplemented with charging through a fast charging module using an external power source, which reduces the voltage difference between the first and second batteries, thereby ensuring that the mutual charging current between the first and second batteries is within a limited value when they are connected in parallel, thus protecting the circuit components.

[0024] In conjunction with the second aspect, in a second possible implementation, when the voltage of the first or second battery is greater than a second voltage threshold, the charging current of the first and second batteries is less than a first current threshold, the voltage difference between the first and second batteries is greater than or equal to the mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the power supply controller can discharge the second battery before switching to parallel charging of the first and second batteries. Here, the power supply controller can connect the ordinary charging module and the second battery, disconnect the first battery from the voltage conversion module and the external power supply, disconnect the first switching transistor and close the second switching transistor, and supply power to the terminal load through the second battery until the voltage difference between the first and second batteries is less than the mutual charging threshold. This implementation can use the second battery to supply power to the terminal load before switching to parallel charging of the first and second batteries, reducing the voltage difference between the first and second batteries, thereby ensuring that the mutual charging current is within a limited value when the first and second batteries are connected in parallel, protecting circuit components.

[0025] In conjunction with the second aspect, in a third possible implementation, when the voltage of the first or second battery is greater than a second voltage threshold, the charging current of the first and second batteries is less than a first current threshold, the voltage difference between the first and second batteries is greater than or equal to the mutual charging threshold, and the voltage of the first battery is greater than the voltage of the second battery, the power supply controller can supplement the charging of the second battery before switching to parallel charging of the first and second batteries. Here, the power supply controller can connect the ordinary charging module, the second battery, and the external power supply, disconnect the first battery from the voltage conversion module and the external power supply, disconnect the first switching transistor and close the second switching transistor, charge the second battery through the ordinary charging module, and simultaneously supply power to the terminal load through the second battery until the voltage difference between the first and second batteries is less than the mutual charging threshold. When the second battery supplies power to the terminal load, the current can flow through the ordinary charging module. This implementation can use the second battery to supply power to the terminal load before switching to parallel charging of the first and second batteries, while simultaneously using the external power supply to supplement the charging of the second battery through the ordinary charging module, reducing the voltage difference between the first and second batteries, thereby ensuring that the mutual charging current is within a limited value when the first and second batteries are connected in parallel, protecting the circuit components.

[0026] In conjunction with the second aspect, in a fourth possible implementation, the battery system further includes a current-limiting module and a third switching transistor. One end of the current-limiting module is connected to the positive terminal of the first battery, and the other end is connected to the positive terminal of the second battery via the third switching transistor. When the voltage of either the first or second battery is greater than a second voltage threshold, the charging current of the first and second batteries is less than a first current threshold, and the voltage difference between the first and second batteries is greater than or equal to the mutual charging threshold, the power supply controller can connect the ordinary charging module to the second battery, disconnect the first battery from the voltage conversion module and the external power supply, disconnect the first switching transistor, and close the second and third switching transistors to allow the first and second batteries to be connected in parallel through the current-limiting module. This controls the first and second batteries to supply power to the terminal load in parallel until the voltage difference between the first and second batteries is less than the mutual charging threshold. Here, the current-limiting module is used to share the voltage difference between the first and second batteries to limit the mutual charging current between them. This implementation can utilize a current limiting module to share the voltage difference between the first and second batteries when the voltage difference is too large, thereby limiting the mutual charging current when the first and second batteries are connected in parallel, and ensuring that the mutual charging current is within the limit value, thus protecting the circuit components.

[0027] In conjunction with the second aspect, in the fifth possible implementation, when the voltage of the first and second batteries is greater than or equal to the full-charge threshold, and the charging current of the first and second batteries is less than the second current threshold, the power supply controller can trigger the ordinary charging module to stop charging the first and second batteries. In this implementation, the power supply controller can stop charging the first and second batteries when they are fully charged, avoiding overcharging and extending battery life.

[0028] In conjunction with the fifth possible implementation of the second aspect, in the sixth possible implementation, when the voltages of both the first and second batteries are less than the third voltage threshold, the power supply controller can close the first switch, open the second switch, and connect the first battery and the voltage conversion module, while disconnecting the ordinary charging module from the first and second batteries, thereby controlling the first and second batteries to supply power to the terminal load in series. When the voltages of both batteries are less than the third voltage threshold, the terminal load is at risk of power loss. This implementation can ensure the power supply to the terminal load by increasing the battery supply voltage through connecting the first and second batteries in series.

[0029] In conjunction with the sixth possible implementation of the second aspect, in the seventh possible implementation, the third voltage threshold is determined by the parallel operating current I of the first and second batteries, the internal resistance R of the parallel connection of the first and second batteries, the maximum power consumption current Imax of the terminal load, and the power-down voltage Vdown of the terminal load. This implementation can dynamically determine the third voltage threshold according to the battery's operating environment and aging state, further ensuring the power supply to the terminal load and improving the battery's energy utilization rate.

[0030] In conjunction with the seventh possible implementation of the second aspect, in the eighth possible implementation, the third voltage threshold satisfies:

[0031] V = Vdown + (Imax - I) * R

[0032] Here, V is the third voltage threshold, Vdown is the power-down voltage, Imax is the maximum power consumption current, I is the parallel operating current, and R is the internal resistance of the parallel battery. This implementation can dynamically determine the third voltage threshold based on the battery's operating environment and aging state. It switches between the first and second batteries to power the terminal load based on the third voltage threshold and battery voltage, simplifying operation and further ensuring power supply to the terminal load while improving battery energy utilization.

[0033] In conjunction with the second aspect or any of the first to eighth possible embodiments of the second aspect, in the ninth possible embodiment, the battery system further includes a fourth switching transistor. The fourth switching transistor is connected between the fast charging module and the external power supply, or between the positive terminal of the first battery and the fast charging module, or integrated into the fast charging module. The connection position of the fourth switching transistor is flexible and highly adaptable. The power supply controller can disconnect the fourth switching transistor to disconnect the first battery from the external power supply. In this embodiment, the power supply controller can control the connection and disconnection of the first battery from the external power supply by controlling the fourth switching transistor, making operation simple and flexible.

[0034] In conjunction with the ninth possible implementation of the second aspect, the tenth possible implementation further includes a fifth switching transistor in the battery system. This fifth switching transistor is connected between the positive terminal of the first battery and the voltage conversion module, or integrated into the voltage conversion module. The connection position of the fifth switching transistor is flexible and highly adaptable. The power supply controller can disconnect or connect the fifth switching transistor to disconnect or connect the first battery and the voltage conversion module. In this implementation, the power supply controller can control the connection and disconnection of the first battery and the voltage conversion module by controlling the fifth switching transistor, making operation simple and flexible.

[0035] In conjunction with the ninth or tenth possible implementation of the second aspect, in the eleventh possible implementation, the battery system further includes a sixth switch. The sixth switch is connected between the positive terminal of the first battery and the ordinary charging module, or integrated into the ordinary charging module. The connection position of the sixth switch is flexible and highly adaptable. The power supply controller can disconnect or connect the sixth switch to disconnect or connect the first battery and the ordinary charging module. In this implementation, the power supply controller can control the connection and disconnection of the first battery and the ordinary charging module by controlling the sixth switch, making operation simple and flexible.

[0036] In conjunction with any of the ninth to eleventh possible implementations of the second aspect, in the twelfth possible implementation, the battery system further includes a seventh switch. The seventh switch is connected between the positive terminal of the second battery and the ordinary charging module, or integrated into the ordinary charging module. The connection position of the seventh switch is flexible and highly adaptable. The power supply controller can disconnect or connect the seventh switch to disconnect or connect the second battery and the ordinary charging module. In this implementation, the power supply controller can control the connection and disconnection of the second battery and the ordinary charging module by controlling the seventh switch, making operation simple and flexible.

[0037] In conjunction with any of the ninth to twelfth possible implementations of the second aspect, in the thirteenth possible implementation, the battery system further includes an eighth switching transistor. This eighth switching transistor is connected between the ordinary charging module and the external power supply, or integrated into the ordinary charging module. The connection position of the eighth switching transistor is flexible and highly adaptable. The power supply controller can disconnect or connect the eighth switching transistor to disconnect or connect the ordinary charging module to the external power supply. In this implementation, the power supply controller can control the connection and disconnection of the ordinary charging module and the external power supply by controlling the eighth switching transistor, making operation simple and flexible.

[0038] Thirdly, this application provides a terminal, which includes a terminal load, a battery system, a charging interface, and a power supply controller provided in the second aspect and / or any possible implementation of the second aspect. Here, the charging interface is used to connect to an external power source. The battery system includes a fast charging module, a voltage conversion module, a normal charging module, a first battery, a second battery, a first switching transistor, and a second switching transistor. One end of the fast charging module is coupled to the external power source through the charging interface, and the other end of the fast charging module is connected to the positive terminal of the first battery and one end of the voltage conversion module. The other end of the voltage conversion module is connected to the terminal load. The positive terminal of the first battery is connected to the terminal load through the normal charging module. The negative terminal of the first battery is connected to the positive terminal of the second battery through the first switching transistor and grounded through the second switching transistor. The positive terminal of the second battery is connected to the terminal load through the normal charging module, and the negative terminal of the second battery is grounded. The other end of the normal charging module is coupled to the external power source through the charging interface.

[0039] In conjunction with the third aspect, in a first possible implementation, the battery system further includes a current limiting module and a third switching transistor. One end of the current limiting module is connected to the positive terminal of the first battery, and the other end of the current limiting module is connected to the positive terminal of the second battery through the third switching transistor.

[0040] In conjunction with the third aspect or the first possible implementation of the third aspect, in the second possible implementation, the battery system further includes a fourth switching transistor, which is connected between the fast charging module and the external power supply, or connected between the positive terminal of the first battery and the fast charging module, or integrated into the fast charging module.

[0041] In conjunction with any of the third aspect to the second possible implementation of the third aspect, in the third possible implementation, the battery system further includes a fifth switching transistor, which is connected between the positive terminal of the first battery and the voltage conversion module, or integrated into the voltage conversion module.

[0042] In conjunction with any of the third aspect to the third possible implementation, in the fourth possible implementation, the battery system further includes a sixth switch, which is connected between the positive terminal of the first battery and the ordinary charging module, or integrated into the ordinary charging module.

[0043] In conjunction with any of the third to fourth possible implementations of the third aspect, in the fifth possible implementation, the battery system further includes a seventh switch, which is connected between the positive terminal of the second battery and the ordinary charging module, or integrated into the ordinary charging module.

[0044] In conjunction with any of the third to fifth possible implementations of the third aspect, in the sixth possible implementation, the battery system further includes an eighth switch, which is connected between the ordinary charging module and the external power supply, or integrated into the ordinary charging module.

[0045] In the embodiments provided in this application, series or parallel charging can be selected based on the voltage and / or charging current of the first and second batteries. Series charging is used to improve charging efficiency when the battery level is low, while parallel charging is used when the battery level is high, as the charging current is smaller and heat generation can be reduced. Simultaneously, the power supply to the terminal load can be determined based on the power of the external power source and / or the batteries, enhancing the applicability of the battery system. Attached Figure Description

[0046] Figure 1 This is a circuit diagram of the series dual-cell structure provided in this application;

[0047] Figure 2 This is a circuit diagram of the parallel dual-battery structure provided in this application;

[0048] Figure 3 This is a schematic diagram illustrating an application scenario of the power supply control method for the terminal provided in this application embodiment;

[0049] Figure 4 This is a structural schematic diagram of the terminal provided in this application;

[0050] Figure 5 This is a structural schematic diagram of the battery system of the terminal provided in this application;

[0051] Figure 6 This is a flowchart illustrating the power supply control method for the terminal provided in this application;

[0052] Figure 7 This is another structural schematic diagram of the battery system of the terminal provided in this application;

[0053] Figure 8This is a schematic diagram illustrating the conversion of the power supply control method for the terminal provided in this application;

[0054] Figure 9 This is another structural schematic diagram of the terminal provided in the embodiments of this application. Detailed Implementation

[0055] The power supply control method for the terminal provided in this application is applicable to the charging control of the terminal's battery system and the power supply control of the battery system to the terminal load. The terminal can include large terminals such as electric vehicles and electric cars, as well as small and medium-sized terminals such as mobile phones, tablets, wireless headphones, and wireless speakers. For ease of description, a mobile phone can be used as an example. See [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic diagram illustrating an application scenario of the power supply control method for the terminal provided in this application embodiment. For example... Figure 3 As shown, during the charging process of a mobile phone (such as terminal 2000), the mobile phone can be connected to an external power source. This external power source can be an external power source 3000a connected to a household socket, an external power source 3000b connected to a data interface such as USB, an external power source 3000c such as a wireless charger, or an external power source 3000n such as a power bank. The external power source charges the battery in the mobile phone's battery system or charges the load in the mobile phone through the power interface and the charging interface of the mobile phone.

[0056] The power supply control method for the terminal provided in this application is applicable to the power supply control of the terminal's battery system. See [link to relevant documentation]. Figure 4 , Figure 4 This is a structural diagram of the terminal provided in this application. For example... Figure 4 As shown, the aforementioned terminal may include a terminal load 401, a battery system 402, a power supply controller 404, and a charging interface 403. The battery system 402 can be used to power the terminal load 401, such as a mobile phone, tablet computer, wireless headset, or wireless speaker. The power supply controller 404 can be a functional module within the terminal, possibly an integrated circuit chip with signal processing capabilities, or a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The specific designation depends on the actual application scenario and is not limited here.

[0057] For ease of explanation, this application uses the example of powering a mobile terminal for illustration. In many application scenarios, such as the increasingly high charging power of current consumer electronics products like mobile phones, traditional single-battery power supply structures struggle to support the high-power charging characteristics of these products, while dual-battery power supply structures are suitable for high-power charging scenarios. For ease of understanding, the following will combine... Figure 5 An example of the battery system of the terminal provided in this application is given.

[0058] See Figure 5 , Figure 5 This is a structural schematic diagram of the battery system of the terminal provided in this application. Figure 5 As shown, this method is applicable to the battery system of a terminal. Here, the battery system includes a fast charging module 101, a normal charging module 102, a voltage conversion module 104, a first battery, a second battery, a first switch K1, and a second switch K2.

[0059] In some feasible implementations, one end of the fast charging module 101 is coupled to the external power supply 100, and the other end of the fast charging module 101 is connected to the positive terminal of the first battery and one end of the voltage conversion module 104. The other end of the voltage conversion module 104 is connected to the terminal load 103. The positive terminal of the first battery is connected to the terminal load 103 through the ordinary charging module 102. The negative terminal of the first battery is connected to the positive terminal of the second battery through the first switching transistor K1 and grounded through the second switching transistor K2. The positive terminal of the second battery is connected to the terminal load 103 through the ordinary charging module 102, and the negative terminal of the second battery is grounded. The other end of the ordinary charging module 102 is coupled to the external power supply 100.

[0060] The power supply control method for the terminal provided in this application can be applied to, for example... Figure 5 The power supply control of the terminal's battery system, as shown, can be specifically executed by the power supply controller within the terminal. Please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a flowchart illustrating the power supply control method for the terminal provided in this application. The method includes the following steps:

[0061] S11: Battery system coupled to external power source.

[0062] In some feasible implementations, when an external power source (such as a charger) is connected, the power supply controller can first determine the type or specifications of the battery (e.g., charging power, whether it supports fast charging protocols, charging voltage, etc.) to determine whether the external power source has the capability of dynamic voltage and current regulation. Then, based on the capability of the external power source, it can determine whether to dynamically adjust the series charging or parallel charging of the batteries in the battery system. The fast charging module 101 or the ordinary charging module 102 in the battery system can be coupled to the external power source 100. The power supply controller can determine which charging module in the battery system is coupled to the external power source 100 based on the specifications of the external power source 100 (e.g., charging power, charging voltage, whether it supports fast charging protocols, whether it has the capability of dynamic voltage and current regulation, etc.) and the states of the first and second batteries in the battery system (e.g., battery voltage, operating current, battery temperature, etc.). It is understood that the method provided in this application is applicable to application scenarios where the external power source supports fast charging protocols and has the capability of dynamic voltage and current regulation. The following will provide examples illustrating the implementation methods of battery charging and power supply to the terminal load in this application scenario.

[0063] For some feasible implementation methods, please refer to Figure 7 , Figure 7 This is another structural schematic diagram of the battery system of the terminal provided in this application. Here, the battery system may include switching elements (which can also be integrated into the fast charging module 101) at both ends of the fast charging module 101 for controlling the circuit to be turned on or off. For example, a fourth switch K4 connected between the external power supply 100 and the fast charging module 101 can connect or disconnect the fast charging module 101 from the external power supply 100 by controlling the fourth switch K4 to be turned on or off. Optionally, the switching element can also be connected between the fast charging module 101 and the positive terminal of the first battery, such as... Figure 7 The switching transistor K`4 is used in this circuit. Here, the power supply controller can disconnect the first battery from the external power supply 100 by disconnecting the fourth switching transistor K4 or K`4, which is simple and flexible to operate.

[0064] In some feasible implementations, such as Figure 7 As shown, the battery system may include switching elements (which can also be integrated into the ordinary charging module 102) at both ends of the ordinary charging module 102 to control the circuit to turn on or off, for example, the eighth switching transistor K8. Here, the ordinary charging circuit 102 is connected to the external power supply through the eighth switching transistor K8. Here, the power supply controller can disconnect or connect the ordinary charging module 102 to the external power supply 100 by opening or closing the eighth switching transistor K8, which is simple and flexible to operate.

[0065] In some feasible implementations, such as Figure 7As shown, the negative terminal of the second battery can be grounded through the protective resistor R1 to prevent excessive current at the grounding terminal of the battery system and to protect the battery system.

[0066] In some feasible implementations, such as Figure 7 As shown, the external power supply 100 may include a charger and a power interface, wherein the charger and the power interface can be connected via a power cord and a signal line to achieve signal or energy transfer. The external power supply 100 can be connected to the battery system via the power interface.

[0067] S12: Determine whether the voltage of the first battery and the second battery is less than or equal to the first voltage threshold. If the determination result is yes, proceed to step S13; otherwise, proceed to step S14.

[0068] In some feasible implementations, the power supply controller can determine a first voltage threshold based on the operating voltage of the terminal load. Here, the first voltage threshold is a relatively low voltage value. When the voltages of both the first and second batteries are lower than the first voltage threshold, the power supply controller can determine that the battery system is severely depleted and use the highest power charging mode to replenish the energy as quickly as possible, i.e., the first and second batteries are charged in series (at this time, the power supply controller can execute step S13). Otherwise, the power supply controller can determine that the battery is still in a relatively sufficient state. In order to reduce energy waste and extend battery life, the power supply controller will further determine the battery status and appropriately switch the power supply mode of the battery system (at this time, the power supply controller can execute step S14).

[0069] S13: Close the first switch K1 and open the second switch K2 to disconnect the connection between the ordinary charging module and the first battery, the second battery and the external power supply, and charge the first battery and the second battery through the fast charging module.

[0070] In some feasible implementations, when the voltage of the first battery and the second battery is less than a first voltage threshold, the power supply controller can control the battery system to close the first switch K1 and open the second switch K2 to connect the first battery and the second battery in series, disconnect the connection between the ordinary charging module 102 and the first battery, the second battery, and the external power supply 100, and charge the first battery and the second battery in series through the fast charging module 101. Figure 7As shown, the power supply controller can turn on K4 or K'4 to connect the first battery and the external power supply 100, so that the first battery and the second battery can be charged in series through the fast charging module 101. At this time, the terminal load 103 can be powered by the first battery and the second battery in series, and the output voltage of the first battery and the second battery in series can be converted into a target voltage by the voltage conversion module 104 to power the terminal load 103. Here, the target voltage can be the voltage required by the terminal load 103, or the supply voltage when a single battery powers the terminal load 103, such as 4V (the output voltage of the first battery and the second battery in series can be 8V). At the same time, if the power of the external power supply 100 (such as a charger) (i.e., the charging power of the external power supply 100) is greater than the charging power of the first battery and the second battery in series, and there is still enough power to power the terminal load 103, the terminal load 103 can be powered by the fast charging module 101.

[0071] In some feasible implementations, such as Figure 7 As shown, the battery system may also include switching elements (which can be integrated into the voltage conversion module 104) at both ends of the voltage conversion module 104 to control the circuit's on / off state, for example, a fifth switching transistor K5. Here, the voltage conversion module 104 is connected to the fast charging module 101 via the fifth switching transistor K5. The power supply controller can disconnect or connect the first battery to the voltage conversion module 104 by opening or closing the fifth switching transistor K5, making operation simple and flexible.

[0072] In some feasible implementations, the power supply controller can determine the charging power of the external power source (such as the charger's power) by judging whether the charger has the ability to dynamically adjust voltage and current. Based on the charger's power, the controller can determine whether to control the first and second batteries in the battery system to be charged in series or in parallel, or to supply power to the terminal load. When the first and second batteries are charged in series, if the power of the external power source 100 (such as the charger) (i.e., the charging power of the external power source 100) is greater than the power of the first and second batteries charged in series, and there is still enough power to supply power to the terminal load 103, the power supply controller can control the fast charging module 101 to supply power to the terminal load 103. When the first and second batteries are charged in parallel, if the power of the external power source 100 (such as the charger) (i.e., the charging power of the external power source 100) is greater than the power of the first and second batteries charged in parallel, and there is still enough power to supply power to the terminal load 103, the power supply controller can control the ordinary charging module 102 to supply power to the terminal load 103. Optionally, in some feasible implementations, the fast charging module 101 and the ordinary charging module 102 in the battery system can be integrated into one circuit device or can be two independent circuit devices, which can be determined according to the actual application scenario and is not limited here.

[0073] S14: Periodically sample the voltage and charging current of the first and second batteries.

[0074] In some feasible implementations, as the voltages of the first and second batteries change, the battery states (e.g., operating current, battery temperature, etc.) also change accordingly. The power supply controller can periodically sample battery parameters such as the voltages and charging currents of the first and second batteries. Based on the sampled battery parameters, it can control the battery charging state in a timely manner, thereby switching to a more reasonable power supply mode to supply power to the terminal load 103, reducing energy waste, and extending battery life.

[0075] S15: Determine whether the voltage of the first battery or the second battery is greater than or equal to the second voltage threshold, and whether the charging current of the first battery or the second battery is less than the first current threshold. If the determination result is yes, proceed to step S16; otherwise, proceed to step S14.

[0076] In some feasible implementations, as the voltage of the first and second batteries increases, the power supply controller can sample battery parameters such as the voltage and charging current of the first and second batteries. When the voltage of the first or second battery is greater than a second voltage threshold, and the charging current of the first and second batteries is less than a first current threshold (wherein, the second voltage threshold is greater than the first voltage threshold, and the first current threshold can be determined according to the actual application scenario or product form, and is not limited here), it indicates that the battery charge has reached a relatively sufficient state, enough to supply power to the terminal load 103 independently for a period of time. At this time, in order to reduce energy waste and extend battery life, the power supply controller should further judge the battery status and appropriately switch the power supply mode of the battery system.

[0077] S16: Determine whether the voltage difference between the first battery and the second battery is less than the mutual charging threshold. If the result is yes, proceed to step S18; otherwise, proceed to step S17.

[0078] In some feasible implementations, if the voltage difference between the first battery and the second battery is less than the mutual charging threshold, the power supply controller determines that the two batteries can be directly connected in parallel. At this time, even if there is a voltage difference between the first battery and the second battery, or mutual charging occurs, it will not cause excessive damage to the batteries, and the power supply controller can directly execute step S18.

[0079] S17: Recharge the battery with low voltage until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

[0080] In some feasible implementations, such as Figure 7 As shown, the battery system may include a switching element (which can also be integrated into the general charging module 102) between the general charging module 102 and the second battery to control the circuit to turn on or off. For example, a seventh switch K7. Here, the general charging module 102 is connected to the positive terminal of the second battery through the seventh switch K7. Here, the power supply controller can disconnect or connect the connection between the second battery and the general charging module 102 by opening or closing the seventh switch K7, which is simple and flexible to operate.

[0081] In some feasible implementations, when the voltage of the first battery is lower than the voltage of the second battery, if the fast charging module 101 supports single-battery charging, the power supply controller can control the battery system to supplement the charging of the first battery before switching the battery system to parallel charging of the first and second batteries. Here, the power supply controller can control the battery system to connect the ordinary charging module 102 and the second battery (i.e., close K7) to supply power to the terminal load through the second battery. At this time, the power supply controller can disconnect the connection between the first battery and the voltage conversion module 104 (i.e., disconnect K5), disconnect the first switch K1 and close the second switch K2 to connect the first battery and the second battery in parallel, and charge the first battery through the fast charging module 101 (close K4) until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. When the second battery supplies power to the terminal load 103, the current can flow through the ordinary charging module 102; in other words, the second battery can supply power to the terminal load through the ordinary charging module 102. Figure 7 As shown, the power supply controller can close the seventh switch K7 to supply power to the terminal load through the second battery. Simultaneously, it can open the first switch K1 and close the second switch K2 to connect the first and second batteries in parallel. It can also open the fifth switch K5 to disconnect the first battery from the voltage conversion module 104, thus connecting the branch formed by the external power supply 100, the fast charging module 101, and the first battery. This allows the fast charging module 101 to charge the first battery, and the second battery to supply power to the terminal load 103 until the voltage difference between the first and second batteries is less than the mutual charging threshold. This implementation ensures that the terminal load 103 is supplied with power while the external power supply is supplementing the first battery's charge, prioritizing the power supply to the terminal load 103. Simultaneously, before the power supply controller switches the battery system to parallel charging of the first and second batteries, the external power supply 100 supplements the first battery with charge through the fast charging module 101, reducing the voltage difference between the first and second batteries until the voltage difference is less than the mutual charging threshold. This ensures that the mutual charging current is within a limited value when the first and second batteries are connected in parallel, protecting circuit components. Optionally, such as... Figure 7 As shown, the negative terminal of the second battery can be grounded through the protective resistor R1 to prevent excessive current at the grounding terminal of the battery system and to protect the battery system.

[0082] In some feasible implementations, when the voltage of the first battery is lower than the voltage of the second battery, if the fast charging module does not support single-battery charging, the power supply controller can control the battery system to discharge the second battery before switching the battery system to parallel charging of the first and second batteries. Here, the power supply controller can control the battery system to connect the ordinary charging module 102 and the second battery, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1 and close the second switch K2 to connect the first and second batteries in parallel, and supply power to the terminal load 103 through the second battery. Figure 7 As shown, the power supply controller can close the seventh switch K7 to connect the ordinary charging module 102 and the second battery, thereby supplying power to the terminal load 103 through the second battery. Simultaneously, it can disconnect the first switch K1, close the second switch K2, and disconnect the fourth switch K4 and the fifth switch K5, thus connecting the branches of the ordinary charging module 102 and the second battery, and disconnecting the first battery from the voltage conversion module 104 and the external power supply 100, until the voltage difference between the first and second batteries is less than the mutual charging threshold. This implementation allows the second battery to supply power to the terminal load 103 before switching to parallel charging of the first and second batteries, until the voltage difference between the first and second batteries is less than the mutual charging threshold, reducing the voltage difference between the first and second batteries, and thus ensuring that the mutual charging current is within a limited value when the first and second batteries are connected in parallel, protecting circuit components.

[0083] In some feasible implementations, when the voltage of the first battery is greater than the voltage of the second battery, the power supply controller can control the battery system to supplement the charging of the second battery before switching the battery system to parallel charging of the first and second batteries. Here, the power supply controller can control the battery system to connect the ordinary charging module 102, the second battery, and the external power supply 100, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1 and close the second switch K2, charge the second battery through the ordinary charging module 102, and simultaneously supply power to the terminal load 103 through the second battery. Figure 7As shown, the power supply controller can close the seventh switch K7 to connect the ordinary charging module 102 and the second battery, thereby supplying power to the terminal load 103 through the second battery. Simultaneously, it can close the eighth switch K8 to connect the external power supply 100, the ordinary charging module 102, and the second battery, allowing the ordinary charging module 102 to charge the second battery. Furthermore, the power supply controller can disconnect the first switch K1 and close the second switch K2 to connect the first and second batteries in parallel. Simultaneously, it can disconnect the fourth switch K4 and the fifth switch K5 to disconnect the first battery from the voltage conversion module 104 and the external power supply 100, until the voltage difference between the first and second batteries is less than the mutual charging threshold. This implementation allows power to the terminal load 103 through the second battery before switching to parallel charging of the first and second batteries. Simultaneously, the external power supply 100 provides supplementary charging to the second battery through the ordinary charging module 102, reducing the voltage difference between the first and second batteries until it is less than the mutual charging threshold. This ensures that the mutual charging current is within a limited value when the first and second batteries are connected in parallel, protecting circuit components.

[0084] S18: Connect the ordinary charging module to the first battery, the second battery, and the external power supply; disconnect the first battery from the voltage conversion module and the external power supply; disconnect the first switching transistor and close the second switching transistor; and charge the first and second batteries through the ordinary charging module.

[0085] In some feasible implementations, when the voltage of the first battery or the second battery is greater than a second voltage threshold, and the voltage difference between the first battery and the second battery is less than the mutual charging threshold, the power supply controller can connect the ordinary charging module 102 to the first battery, the second battery, and the external power supply 100, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1 and close the second switch K2, and charge the first battery and the second battery in parallel through the ordinary charging module 102. Here, the second voltage threshold is greater than or equal to the first voltage threshold. Simultaneously, if the power of the external power supply 100 (e.g., a charger) (i.e., the charging power of the external power supply 100) is greater than the power of the parallel charging of the first and second batteries, and there is still sufficient power to supply the terminal load 103, the power supply controller can control the ordinary charging module 102 to supply power to the terminal load 103. Figure 7As shown, the battery system may include a switching element (which can also be integrated into the voltage conversion module 104) between the ordinary charging module 102 and the first battery to control the circuit's on / off state. For example, a sixth switching transistor K6. The ordinary charging module 102 is connected to the positive terminal of the first battery via the sixth switching transistor K6. The power supply controller can disconnect or connect the first battery to the ordinary charging module 102 by opening or closing the sixth switching transistor K6. This implementation allows the power supply controller to control the sixth switching transistor K6, thereby controlling the connection and disconnection of the first battery to the ordinary charging module 102, making operation simple and flexible.

[0086] In some feasible implementations, the power supply controller can close the sixth switch K6, the seventh switch K7, and the eighth switch K8, open the first switch K1 and close the second switch K2, and open the fourth switch K4 and the fifth switch K5, thereby connecting the branch formed by the ordinary charging module 102 and the first and second batteries, and connecting the ordinary charging circuit 1021 in the ordinary charging module 102 and the branch of the ordinary charging module 102 and the external power supply 100. Then, the first and second batteries can be charged in parallel through the ordinary charging module 102, and the first and second batteries can be connected in parallel to supply power to the terminal load 103 through the ordinary charging module 102.

[0087] In some feasible implementations, such as Figure 7 As shown, the battery system also includes a current limiting module 105 and a third switch K3. One end of the current limiting module 105 is connected to the positive terminal of the first battery, and the other end of the current limiting module 105 is connected to the positive terminal of the second battery through the third switch K3. When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, and the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, the power supply controller can connect the ordinary charging module 102 to the second battery, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1, and close the second switch K2 and the third switch K3, so that the first battery and the second battery are connected in parallel through the current limiting module 105 to achieve mutual charging between the first battery and the second battery. At the same time, the second battery supplies power to the terminal load 103 until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. Here, the current limiting module 105 is used to share the voltage difference between the first battery and the second battery to limit the mutual charging current between the first battery and the second battery. This implementation can utilize the current limiting module 105 to share the voltage difference between the first and second batteries when the voltage difference is too large, thereby limiting the mutual charging current when the first and second batteries are connected in parallel, and ensuring that the mutual charging current when the first and second batteries are connected in parallel is within the limit value, thus protecting the circuit components.

[0088] In the embodiments provided in this application, the power supply controller can select to use series or parallel charging based on the voltage and / or charging current of the first and second batteries. Series charging is used when the battery level is low to improve charging efficiency, while parallel charging is used when the battery level is high, as the charging current is smaller and heat generation is reduced. Simultaneously, the power supply controller can determine whether the terminal load 103 is powered by the external power supply 100 and / or the battery based on the charger's power, enhancing the applicability of the battery system.

[0089] In some feasible implementations, when the second battery and the second battery are charged in parallel until the voltage of the first battery and the second battery is greater than or equal to the full charge threshold, and the charging current of the first battery and the second battery is less than the second current threshold (the second current threshold can be set according to the actual application scenario and is not limited here), the power supply controller can trigger the ordinary charging module 102 to stop charging the first battery and the second battery. In other words, at this time, if the external power supply (such as a charger) is not disconnected, the ordinary charging module 102 can stop charging the battery and can still supply power to the terminal load. The power supply controller can also control the terminal's battery system to supply power to the terminal load when the terminal charging is completed and the external power supply is disconnected. During the process of the terminal's battery system supplying power to the terminal load after the external power supply is disconnected, the battery system is not coupled to the external power supply (e.g., ...). Figure 7 As shown, K4 and K8 can be disconnected at this time. The battery system can still supply power to the terminal load by changing the battery connection method, maximizing the normal operation of the terminal load and improving the energy utilization efficiency of the battery system. Please refer to [the documentation / reference] for details. Figure 8 , Figure 8 This is a schematic diagram illustrating the battery connection method conversion of the power supply control method for the terminal provided in this application. During the process of the first and second batteries supplying power to the terminal load in parallel, the power supply controller can detect the voltage status of the first and second batteries in real time or periodically. When the voltage of both the first and second batteries is detected to be less than a third voltage threshold, if the first and second batteries continue to supply power to the terminal load in parallel, the terminal load will be at risk of power loss. At this time, the power supply controller can close the first switch K1, open the second switch K2, and connect the first battery and the voltage conversion module 104 (closing K5), while disconnecting the ordinary charging module 102 from the first and second batteries (i.e., disconnecting K6 and K7), to control the first and second batteries to supply power to the terminal load 103 in series. This implementation can increase the battery supply voltage by connecting the first and second batteries in series, ensuring the power supply to the terminal load. When the voltage of either the first or second battery is greater than or equal to the third voltage threshold, it indicates that the terminal load is not at risk of power loss. At this time, the system can be powered by a single battery with a higher capacity, or by connecting batteries in parallel.

[0090] The power supply controller can determine the maximum power consumption current Imax and the power-down voltage Vdown of the terminal load based on data such as the terminal's product form and power consumption test results. It can also determine the parallel operating current I of the first and second batteries through real-time or periodic detection, and determine parameters such as the internal resistance R of the parallel connection of the first and second batteries using parameters like battery temperature. Furthermore, the power supply controller can determine the aforementioned third voltage threshold based on the parallel operating current I of the first and second batteries, the internal resistance R of the parallel connection of the first and second batteries, the maximum power consumption current Imax of the terminal load, and the power-down voltage Vdown of the terminal load.

[0091] Specifically, the third voltage threshold satisfies:

[0092] V = Vdown + (Imax - I) * R

[0093] Here, V is the third voltage threshold, Vdown is the power-down voltage, Imax is the maximum power consumption current, I is the parallel operating current, and R is the internal resistance of the parallel battery.

[0094] In this application, the power supply controller can dynamically determine the third voltage threshold according to the battery's operating environment and aging state, and switch the power supply mode of the terminal load based on the first battery and the second battery based on the third voltage threshold and battery voltage and other parameters. The operation is simple, which can further ensure the power supply of the terminal load and improve the energy utilization rate of the battery.

[0095] Please see Figure 9 , Figure 9 This is another structural schematic diagram of the terminal provided in the embodiments of this application. For example... Figure 9As shown, this application also provides a terminal, which includes a terminal load 103, a battery system 1001, a charging interface 1002, and a power supply controller 1003. Here, the charging interface 1002 is used to connect to an external power source 100. The battery system 1001 includes a fast charging module 101, a voltage conversion module 104, a normal charging module 102, a first battery, a second battery, a first switch K1, and a second switch K2. One end of the fast charging module 101 is coupled to an external power supply 100 via a charging interface 1002. The other end of the fast charging module 101 is connected to the positive terminal of the first battery and one end of the voltage conversion module 104. The other end of the voltage conversion module 104 is connected to a terminal load 103. The positive terminal of the first battery is connected to the terminal load 103 via the normal charging module 102. The negative terminal of the first battery is connected to the positive terminal of the second battery via the first switch K1 and grounded via the second switch K2. The positive terminal of the second battery is connected to the terminal load 103 via the normal charging module 102, and the negative terminal of the second battery is grounded. The other end of the normal charging module 102 is coupled to the external power supply 100 via the charging interface 1002. Here, the power supply controller 1003 is applicable to the terminal battery system 1001.

[0096] In some feasible implementations, such as Figure 9 As shown, the external power supply 100 may include a charger and a power interface, wherein the charger and the power interface can be connected via a power cord and a signal line to achieve signal or energy transfer. The external power supply 100 can be connected to the terminal's charging interface 1002 via the power interface.

[0097] In some feasible implementations, when the voltage of the first battery and the second battery is less than or equal to a first voltage threshold, the power supply controller 1003 can close the first switch K1 and open the second switch K2, disconnecting the connection between the ordinary charging module 102 and the first battery, the second battery, and the external power supply 100, and control the fast charging module 101 to charge the first battery and the second battery in series. At this time, the power supply controller 1003 can control the first battery and the second battery in series to supply power to the terminal load 103, and can trigger the voltage conversion module 104 to convert the output voltage of the first battery and the second battery in series into a target voltage to supply power to the terminal load 103. Here, the target voltage can be the required voltage of the terminal load 103, or the supply voltage when a single battery supplies power to the terminal load 103, such as 4V (the output voltage of the first battery and the second battery in series can be 8V). At the same time, if the power of the external power supply (such as a charger) (i.e., the charging power of the external power supply) is greater than the charging power of the first battery and the second battery in series, and there is still enough power to supply power to the terminal load 103, the power supply controller 1003 can control the fast charging module 101 to supply power to the terminal load 103. When the voltage of the first battery or the second battery is greater than or equal to the second voltage threshold, and the voltage difference between the first battery and the second battery is less than the mutual charging threshold, the power supply controller 1003 can connect the ordinary charging module 102 to the first battery, the second battery, and the external power supply 100, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1 and close the second switch K2 to connect the first battery and the second battery in parallel, and control the ordinary charging module 102 to charge the first battery and the second battery in parallel. Here, the second voltage threshold is greater than or equal to the first voltage threshold. At the same time, if the power of the external power supply (such as a charger) (i.e., the charging power of the external power supply) is greater than the power of the first battery and the second battery charging in parallel, and there is still enough power to supply power to the terminal load 103, the power supply controller 1003 can control the ordinary charging module 102 to supply power to the terminal load 103.

[0098] In some feasible implementations, when the voltage of the first or second battery is greater than a second voltage threshold, the charging current of the first and second batteries is less than a first current threshold, the voltage difference between the first and second batteries is greater than or equal to the mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the first battery can be supplementally charged through the battery system before the power supply controller 1003 switches the first and second batteries to parallel charging. Here, the power supply controller 1003 can connect the ordinary charging module 102 and the second battery, disconnect the first battery from the voltage conversion module 104, disconnect the first switch K1 and close the second switch K2, and charge the first battery through the fast charging module 101. At the same time, the second battery supplies power to the terminal load 103 until the voltage difference between the first and second batteries is less than the mutual charging threshold. When the second battery supplies power to the terminal load 103, current can flow through the ordinary charging module 102. This implementation can ensure that the terminal load 103 is supplied with power by a battery and / or power source while supplementing the charging of the first battery, giving priority to ensuring the power supply of the terminal load 103. Meanwhile, before switching to parallel charging of the first and second batteries, the first battery is supplemented with charge by the external power supply 100 through the fast charging module 101, reducing the voltage difference between the first and second batteries, thereby ensuring that the mutual charging current of the first and second batteries is within the limit value when they are connected in parallel, and protecting the circuit components.

[0099] In some feasible implementations, when the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the power supply controller 1003 can discharge the second battery through the battery system before switching the first battery and the second battery to parallel charging. Here, the power supply controller 1003 can connect the ordinary charging module 102 and the second battery, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1 and close the second switch K2, and supply power to the terminal load 103 through the second battery until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. This implementation can use the second battery to supply power to the terminal load 103 before switching to parallel charging of the first battery and the second battery, reducing the voltage difference between the first battery and the second battery, thereby ensuring that the mutual charging current is within the limit value when the first battery and the second battery are connected in parallel, and protecting the circuit components.

[0100] In some feasible implementations, when the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, and the voltage of the first battery is greater than the voltage of the second battery, the second battery can be supplementally charged through the battery system before the power supply controller 1003 switches the first battery and the second battery to charge in parallel. Here, the power supply controller 1003 can connect the ordinary charging module 102 and the second battery and the external power supply 100, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1 and close the second switch K2, charge the second battery through the ordinary charging module 102, and simultaneously supply power to the terminal load 103 through the second battery until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. This implementation allows the second battery to power the terminal load 103 before switching to parallel charging of the first and second batteries. At the same time, the external power supply 100 can supplement the charging of the second battery through the ordinary charging module 102, thereby reducing the voltage difference between the first and second batteries and ensuring that the mutual charging current when the first and second batteries are connected in parallel is within a limited value, thus protecting the circuit components.

[0101] In some feasible implementations, such as Figure 9 As shown, the battery system 1001 may also include a current limiting module 105 and a third switch K3. One end of the current limiting module 105 is connected to the positive terminal of the first battery, and the other end of the current limiting module 105 is connected to the positive terminal of the second battery through the third switch K3. When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, and the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, the power supply controller 1003 can connect the ordinary charging module 102 to the second battery, disconnect the first battery from the voltage conversion module 104 and the external power supply 100, disconnect the first switch K1, and close the second switch K2 and the third switch K3 to allow the first battery and the second battery to be connected in parallel through the current limiting module 105, and control the first battery and the second battery to supply power to the terminal load in parallel until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. Here, the current limiting module 105 is used to share the voltage difference between the first battery and the second battery to limit the mutual charging current between the first battery and the second battery. This implementation can utilize the current limiting module 105 to share the voltage difference between the first and second batteries when the voltage difference is too large, thereby limiting the mutual charging current when the first and second batteries are connected in parallel, and ensuring that the mutual charging current when the first and second batteries are connected in parallel is within the limit value, thus protecting the circuit components.

[0102] In some feasible implementations, when the voltages of both the first and second batteries are greater than or equal to the full-charge threshold, and the charging currents of the first and second batteries are less than the second current threshold, the power supply controller 1003 can trigger the ordinary charging module 102 to stop charging the first and second batteries. Here, the full-charge threshold can be greater than or equal to the second voltage threshold, or it can be the full-charge voltage of the first and second batteries. The specific threshold can be determined according to the actual application scenario and is not limited here. In this implementation, the power supply controller 1003 can trigger the ordinary charging module 102 to stop charging the first and second batteries when they are fully charged, avoiding overcharging and extending battery life.

[0103] In some feasible implementations, the power supply controller 1003 can disconnect the ordinary charging module 102 from the external power supply 100 and control the first battery and the second battery to supply power to the terminal load 103 in parallel. When the voltages of both the first battery and the second battery are less than a third voltage threshold, the power supply controller 1003 can close the first switch K1, open the second switch K2, and connect the first battery and the voltage conversion module 104, while disconnecting the ordinary charging module 102 from the first battery and the second battery, so as to control and supply power to the terminal load 103 through the first battery and the second battery connected in series. When the voltages of both batteries are less than the third voltage threshold, the terminal load 103 is at risk of power loss. This implementation can increase the battery supply voltage by connecting the first battery and the second battery in series to ensure the power supply to the terminal load 103. When the voltage of either the first battery or the second battery is greater than or equal to the third voltage threshold, it indicates that the terminal load is not at risk of power loss. At this time, the system can be powered by a single battery with a higher charge or by connecting batteries in parallel.

[0104] The power supply controller 1003 can determine the third voltage threshold based on the parallel operating current I of the first battery and the second battery, the parallel internal resistance R of the first battery and the second battery, the maximum power consumption current Imax of the terminal load 103, and the power-down voltage Vdown of the terminal load 103.

[0105] Specifically, the third voltage threshold satisfies:

[0106] V = Vdown + (Imax - I) * R

[0107] Here, V is the third voltage threshold, Vdown is the power-down voltage, Imax is the maximum power consumption current, I is the parallel operating current, and R is the internal resistance of the parallel battery. This implementation can dynamically determine the third voltage threshold according to the battery's operating environment and aging state, further ensuring the power supply to the terminal load 103 and improving the battery's energy utilization rate.

[0108] In the embodiments provided in this application, the power supply controller can select series or parallel charging based on the voltage and / or charging current of the first and second batteries. Series charging is used when the battery level is low to improve charging efficiency, while parallel charging is used when the battery level is high, as the charging current is smaller in this case, reducing heat generation. Simultaneously, the controller can determine whether to supply power to the terminal load from an external power source and / or the battery based on the charger's power, enhancing the applicability of the battery system.

[0109] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A power supply control method of a terminal, characterized by, The method is suitable for a battery system of a terminal, wherein the battery system comprises a fast charging module, a voltage conversion module, a normal charging module, a first battery, a second battery, a first switch tube and a second switch tube; one end of the fast charging module is coupled with an external power supply, the other end of the fast charging module is connected with a positive electrode of the first battery and one end of the voltage conversion module respectively, the other end of the voltage conversion module is connected with a terminal load, the positive electrode of the first battery is connected with the terminal load through the normal charging module, the negative electrode of the first battery is connected with a positive electrode of the second battery through the first switch tube and grounded through the second switch tube, the positive electrode of the second battery is connected with the terminal load through the normal charging module, the negative electrode of the second battery is grounded, the other end of the normal charging module is coupled with the external power supply, and the method comprises: when the voltage of the first battery and the second battery is less than or equal to a first voltage threshold, the first switch tube is closed and the second switch tube is disconnected, the connection between the normal charging module and the first battery, the second battery and the external power supply is disconnected, and the first battery and the second battery are charged through the fast charging module, and the output voltage of the first battery and the second battery in series is converted into a target voltage through the voltage conversion module to supply power to the terminal load; when the voltage of the first battery or the second battery is greater than or equal to a second voltage threshold, the second voltage threshold is greater than the first voltage threshold, and the voltage difference between the first battery and the second battery is less than a mutual charging threshold, the connection between the normal charging module and the first battery, the second battery and the external power supply is connected, the connection between the first battery and the voltage conversion module and the external power supply is disconnected, the first switch tube is disconnected and the second switch tube is closed, the first battery and the second battery are charged through the normal charging module, and the terminal load is supplied with power through the normal charging module and / or the first battery and the second battery in parallel; when the voltage of the first battery or the second battery is greater than the second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, and the voltage of the first battery is greater than the voltage of the second battery, the connection between the normal charging module and the second battery and the external power supply is connected, the connection between the first battery and the voltage conversion module and the external power supply is disconnected, the first switch tube is disconnected and the second switch tube is closed, the second battery is charged through the normal charging module, and the terminal load is supplied with power through the second battery until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

2. The method of claim 1, wherein, The method further comprises: When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the connection between the normal charging module and the second battery is turned on, the connection between the first battery and the voltage conversion module is turned off, the first switch tube is turned off and the second switch tube is turned on, the first battery is charged by the fast charging module, and the terminal load is powered by the second battery at the same time, until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

3. The method of claim 1, wherein, The method further comprises: When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the connection between the normal charging module and the second battery is turned on, the connection between the first battery and the voltage conversion module, the external power supply is turned off, the first switch tube is turned off and the second switch tube is turned on, the terminal load is powered by the second battery, until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

4. The method of claim 1, wherein, The battery system further comprises a current limiting module and a third switch tube, one end of the current limiting module is connected to the positive electrode of the first battery, the other end of the current limiting module is connected to the positive electrode of the second battery through the third switch tube, and the method further comprises: When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, the connection between the normal charging module and the second battery is turned on, the connection between the first battery and the voltage conversion module, the external power supply is turned off, the first switch tube is turned off, the second switch tube and the third switch tube are turned on to connect the first battery and the second battery in parallel through the current limiting module, and the terminal load is powered by the parallel connection of the first battery and the second battery, until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. The current limiting module is used to share the voltage difference between the first battery and the second battery to limit the mutual charging current of the first battery and the second battery.

5. The method according to any one of claims 1 to 4, characterized in that, After the first battery and the second battery are charged by the normal charging module, the method further comprises: When the voltage of the first battery and the second battery is greater than or equal to a full charge threshold, and the charging current of the first battery and the second battery is less than a second current threshold, the charging of the first battery and the second battery by the normal charging module is stopped.

6. The method of claim 5, wherein, The method further comprises: When the voltage of the first battery and the second battery are both less than a third voltage threshold, the first switch is closed, the second switch is opened, the connection between the first battery and the voltage conversion module is turned on, the connection between the common charging module and the first battery and the second battery is disconnected, so as to supply power to the terminal load by the first battery and the second battery in series.

7. The method of claim 6, wherein, The third voltage threshold is determined by a parallel working current I of the first battery and the second battery, a parallel battery internal resistance R of the first battery and the second battery, a maximum power consumption current Imax of the terminal load, and a power-down voltage Vdown of the terminal load.

8. The method of claim 7, wherein, The third voltage threshold satisfies: V = Vdown + (Imax - I) * R wherein V is the third voltage threshold, Vdown is the power-down voltage, Imax is the maximum power consumption current, I is the parallel working current, and R is the parallel battery internal resistance.

9. The method according to any one of claims 1 to 6, characterized in that, The battery system further comprises a fourth switch connected between the fast charging module and the external power source, or connected between the positive electrode of the first battery and the fast charging module, or integrated in the fast charging module. The disconnection of the connection between the first battery and the external power source comprises: opening the fourth switch to disconnect the connection between the first battery and the external power source.

10. The method of claim 9, wherein, The battery system further comprises a fifth switch connected between the positive electrode of the first battery and the voltage conversion module, or integrated in the voltage conversion module. The disconnection or connection of the connection between the first battery and the voltage conversion module comprises: opening or closing the fifth switch to disconnect or connect the connection between the first battery and the voltage conversion module.

11. The method according to claim 9 or 10, characterized in that, The battery system further comprises a sixth switch connected between the positive electrode of the first battery and the common charging module, or integrated in the common charging module. The disconnection or connection of the connection between the first battery and the common charging module comprises: opening or closing the sixth switch to disconnect or connect the connection between the first battery and the common charging module.

12. The method according to any one of claims 9-11, characterized in that, The battery system further comprises a seventh switch connected between the positive electrode of the second battery and the common charging module, or integrated in the common charging module. The disconnection or connection of the connection between the second battery and the common charging module comprises: opening or closing the seventh switch to disconnect or connect the connection between the second battery and the common charging module.

13. The method according to any one of claims 9-12, characterized in that, The battery system further comprises an eighth switch connected between the common charging module and the external power source, or integrated in the common charging module. The disconnection or connection of the connection between the common charging module and the external power source comprises: opening or closing the eighth switch to disconnect or connect the connection between the common charging module and the external power source.

14. A power supply controller of a terminal, characterized by comprising: The power supply controller is suitable for being used with a battery system of a terminal, the battery system comprising a fast charging module, a voltage conversion module, a normal charging module, a first battery, a second battery, a first switch tube and a second switch tube; one end of the fast charging module is coupled with an external power supply, the other end of the fast charging module is connected with a positive electrode of the first battery and one end of the voltage conversion module respectively, the other end of the voltage conversion module is connected with a terminal load, the positive electrode of the first battery is connected with the terminal load through the normal charging module, the negative electrode of the first battery is connected with a positive electrode of the second battery through the first switch tube and grounded through the second switch tube, the positive electrode of the second battery is connected with the terminal load through the normal charging module, the negative electrode of the second battery is grounded, the other end of the normal charging module is coupled with the external power supply, and the power supply controller is used for: when the voltage of the first battery and the second battery is less than or equal to a first voltage threshold, closing the first switch tube and opening the second switch tube, disconnecting the normal charging module from the first battery, the second battery and the external power supply, and controlling the fast charging module to charge the first battery and the second battery in series, and simultaneously controlling the voltage conversion module to convert the output voltage of the first battery and the second battery in series into a target voltage to supply power to the terminal load; when the voltage of the first battery or the second battery is greater than or equal to a second voltage threshold, the second voltage threshold is greater than the first voltage threshold, and the voltage difference between the first battery and the second battery is less than a mutual charging threshold, connecting the normal charging module with the first battery, the second battery and the external power supply, disconnecting the first battery from the voltage conversion module and the external power supply, opening the first switch tube and closing the second switch tube, controlling the normal charging module to charge the first battery and the second battery, and simultaneously controlling the normal charging module and / or the first battery and the second battery in parallel to supply power to the terminal load; when the voltage of the first battery or the second battery is greater than the second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to the mutual charging threshold, and the voltage of the first battery is greater than the voltage of the second battery, connecting the normal charging module with the second battery and the external power supply, disconnecting the first battery from the voltage conversion module and the external power supply, opening the first switch tube and closing the second switch tube, controlling the normal charging module to charge the second battery, and simultaneously controlling the second battery to supply power to the terminal load until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

15. The power supply controller of claim 14, wherein, The power supply controller is also used for: When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the connection between the normal charging module and the second battery is turned on, the connection between the first battery and the voltage conversion module is turned off, the first switch tube is turned off and the second switch tube is turned on, the first battery is charged by the fast charging module, and the terminal load is powered by the second battery until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

16. The power supply controller of claim 14, wherein, The power supply controller is further configured to: When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, and the voltage of the first battery is less than the voltage of the second battery, the connection between the normal charging module and the second battery is turned on, the connection between the first battery and the voltage conversion module, the external power supply is turned off, the first switch tube is turned off and the second switch tube is turned on, the terminal load is powered by the second battery until the voltage difference between the first battery and the second battery is less than the mutual charging threshold.

17. The power supply controller of claim 14, wherein, The battery system further comprises a current limiting module and a third switch tube, one end of the current limiting module is connected to the positive electrode of the first battery, the other end of the current limiting module is connected to the positive electrode of the second battery through the third switch tube, and the power supply controller is further configured to: When the voltage of the first battery or the second battery is greater than a second voltage threshold, the charging current of the first battery and the second battery is less than a first current threshold, the voltage difference between the first battery and the second battery is greater than or equal to a mutual charging threshold, the connection between the normal charging module and the second battery is turned on, the connection between the first battery and the voltage conversion module, the external power supply is turned off, the first switch tube is turned off, the second switch tube and the third switch tube are turned on to connect the first battery and the second battery in parallel through the current limiting module, and the first battery and the second battery are controlled to supply power to the terminal load in parallel until the voltage difference between the first battery and the second battery is less than the mutual charging threshold. The current limiting module is configured to share the voltage difference between the first battery and the second battery to limit the mutual charging current of the first battery and the second battery.

18. The power supply controller of any of claims 14-17, wherein, The power supply controller is further configured to: When the voltage of the first battery and the second battery is greater than or equal to a full charge threshold, and the charging current of the first battery and the second battery is less than a second current threshold, the charging of the first battery and the second battery by the normal charging module is stopped.

19. The power supply controller of claim 18, wherein, The power supply controller is further configured to: When the voltage of the first battery and the second battery are both less than a third voltage threshold, the first switch is closed, the second switch is opened, the connection between the first battery and the voltage conversion module is turned on, the connection between the common charging module and the first battery and the second battery is disconnected, so as to control the first battery and the second battery to supply power to the terminal load in series.

20. The power supply controller of claim 19, wherein, The third voltage threshold is determined by a parallel working current I of the first battery and the second battery, a parallel battery internal resistance R of the first battery and the second battery, a maximum power consumption current Imax of the terminal load, and a power-down voltage Vdown of the terminal load.

21. The power supply controller of claim 20, wherein, The third voltage threshold satisfies: V = Vdown + (Imax - I) * R wherein V is the third voltage threshold, Vdown is the power-down voltage, Imax is the maximum power consumption current, I is the parallel working current, and R is the parallel battery internal resistance.

22. The power supply controller of any of claims 14-21, wherein, The battery system further comprises a fourth switch connected between the fast charging module and the external power source, or connected between the positive electrode of the first battery and the fast charging module, or integrated in the fast charging module. The power supply controller is configured to: disconnect the fourth switch to disconnect the first battery from the external power source.

23. The power supply controller of claim 22, wherein, The battery system further comprises a fifth switch connected between the positive electrode of the first battery and the voltage conversion module, or integrated in the voltage conversion module. The power supply controller is configured to: disconnect or close the fifth switch to disconnect or connect the first battery from the voltage conversion module.

24. The power supply controller of claim 22 or 23, wherein, The battery system further comprises a sixth switch connected between the positive electrode of the first battery and the common charging module, or integrated in the common charging module. The power supply controller is configured to: disconnect or close the sixth switch to disconnect or connect the first battery from the common charging module.

25. The power supply controller of any of claims 22-24, wherein, The battery system further comprises a seventh switch connected between the positive electrode of the second battery and the common charging module, or integrated in the common charging module. The power supply controller is configured to: disconnect or close the seventh switch to disconnect or connect the second battery from the common charging module.

26. The power supply controller of any of claims 22-25, wherein, The battery system further comprises an eighth switch connected between the common charging module and the external power source, or integrated in the common charging module. The power supply controller is configured to: disconnect or close the eighth switch to disconnect or connect the common charging module from the external power source.

27. A terminal, characterized by The terminal comprises a terminal load, a battery system, a charging interface, and a power supply controller according to any one of claims 14-26. The charging interface is configured to connect an external power source. The battery system includes a fast charging module, a voltage conversion module, a general charging module, a first battery, a second battery, a first switch tube and a second switch tube, one end of the fast charging module is coupled with an external power supply through the charging interface, the other end of the fast charging module is connected with the positive electrode of the first battery and one end of the voltage conversion module respectively, the other end of the voltage conversion module is connected with the terminal load, the positive electrode of the first battery is connected with the terminal load through the general charging module, the negative electrode of the first battery is connected with the positive electrode of the second battery through the first switch tube and grounded through the second switch tube, the positive electrode of the second battery is connected with the terminal load through the general charging module, the negative electrode of the second battery is grounded, the other end of the general charging module is coupled with the external power supply through the charging interface.

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