CN111864843A - Dual battery charging device and mobile terminal - Google Patents

Abstract

The present application discloses a dual-battery charging device and a mobile terminal. The dual-battery charging device includes a first battery, a second battery and a charging interface. The second battery is connected in series with the first battery. The capacity of the second battery is greater than the capacity of the first battery. The charging interface, the first battery and the second battery form a first charging circuit. The charging interface and the second battery form a second charging circuit. The charging interface charges the first battery and the second battery through the first charging circuit, and charges the second battery through the second charging circuit. In the above-mentioned dual-battery charging device and mobile terminal, when the first battery and the second battery are connected in series, the charging interface charges the first battery and the second battery at the same time through the first charging circuit, and charges the second battery alone through the second charging circuit, so that it can be ensured that the first battery and the second battery with different capacities can both be fully charged, and the capacity of the battery is fully utilized to achieve balanced full charging of the dual batteries.

Description

Dual battery charging device and mobile terminal

technical field

The present application relates to the technical field of charging, and more particularly, to a dual-battery charging device and a mobile terminal.

Background technique

In the prior art, for mobile terminals such as mobile phones and tablets with built-in dual batteries, if the two batteries are connected in series, the parameters such as the size and capacity of the two batteries must be the same to ensure the charging of the two batteries. balanced. However, some foldable mobile terminals generally need to have two built-in batteries in order to improve the battery life and make full use of the structural space. The two different batteries are connected in series, which is prone to the problem of unbalanced charging.

SUMMARY OF THE INVENTION

The present application provides a dual battery charging device and a mobile terminal.

The dual battery charging device provided by this application includes:

the first battery;

a second battery, the second battery is connected in series with the first battery, and the electric capacity of the second battery is greater than that of the first battery;

a charging interface, the charging interface, the first battery and the second battery form a first charging circuit; the charging interface and the second battery form a second charging circuit;

The charging interface charges the first battery and the second battery through the first charging circuit, and charges the second battery through the second charging circuit.

In the above-mentioned dual-battery charging device, the electric capacity of the second battery is greater than the electric capacity of the first battery, and when the first battery and the second battery are connected in series, the charging interface simultaneously supplies the first battery through the first charging circuit. The second battery is charged with the second battery, and the second battery is charged separately through the second charging circuit, so as to ensure that both the first battery and the second battery with different electric capacities can be fully charged, making full use of the power of the battery. capacity, to achieve a balanced full charge of dual batteries.

The mobile terminal of the embodiment of the present application includes a processor and the above-mentioned dual-battery charging device. The processor is connected to the first charging circuit and the second charging circuit, and the processor is configured to control the charging interface to charge the first battery and the second battery through the first charging circuit, and for controlling the charging interface to charge the second battery through the second charging circuit.

In the above mobile terminal, the electric capacity of the second battery is greater than the electric capacity of the first battery, and when the first battery and the second battery are connected in series, the charging interface simultaneously supplies the first battery and the second battery through the first charging circuit. The second battery is charged, and the second battery is charged separately through the second charging circuit, so as to ensure that both the first battery and the second battery with different electric capacities can be fully charged, and the electric capacity of the battery can be fully utilized. Achieving balanced full charging of dual batteries.

Additional aspects and advantages of embodiments of the present application will be set forth, in part, in the following description, and in part will be apparent from the following description, or learned by practice of embodiments of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of a dual battery charging device according to an embodiment of the present application.

FIG. 2 is another schematic structural diagram of a dual-battery charging device according to an embodiment of the present application.

FIG. 3 is another schematic structural diagram of a dual battery charging device according to an embodiment of the present application.

FIG. 4 is another schematic structural diagram of a dual battery charging device according to an embodiment of the present application.

FIG. 5 is another schematic structural diagram of a dual battery charging device according to an embodiment of the present application.

FIG. 6 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application.

FIG. 7 is another schematic structural diagram of a mobile terminal according to an embodiment of the present application.

Description of main component symbols:

Dual battery charging device 100 , first battery 10 , second battery 20 , first charging chip 30 , second charging chip 40 , equalization module 50 , first protection board 60 , second protection board 70 , charging interface 80 , step-down The module 82 , the boosting module 84 , the mobile terminal 1000 , the processor 110 , the first casing 120 , the second casing 130 , and the rotating shaft 140 .

Detailed ways

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application.

In the description of the embodiments of the present application, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a It is a detachable connection, or an integral connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the application. Furthermore, embodiments of the present application may repeat reference numerals and/or reference letters in different instances, such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and/or arrangements discussed . In addition, the embodiments of the present application provide examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to FIG. 1 and FIG. 2 , an embodiment of the present application provides a dual-battery charging device 100 . The dual battery charging device 100 includes a first battery 10 , a second battery 20 and a charging interface 80 . The second battery 20 is connected in series with the first battery 10 . The electric capacity of the second battery 20 is greater than that of the first battery 10 . The charging interface 80 , the first battery 10 and the second battery 20 form a first charging circuit D1 . The charging interface 80 and the second battery 20 form a second charging circuit D2. The charging interface 80 charges the first battery 10 and the second battery 20 through the first charging circuit D1. The charging interface 80 charges the second battery 20 through the second charging circuit D2.

In the dual-battery charging device 100 of the above-mentioned embodiment, the electric capacity of the second battery 20 is greater than that of the first battery 10, and in the case that the first battery 10 and the second battery 20 are connected in series, the charging interface 80 passes through the first battery. The charging circuit D1 simultaneously charges the first battery 10 and the second battery 20, and separately charges the second battery 20 through the second charging circuit D2, so as to ensure that both the first battery 10 and the second battery 20 with different capacities are It can achieve full charge, make full use of the battery capacity, and achieve balanced full charge of the dual batteries.

Specifically, in this embodiment of the present application, the dual-battery charging apparatus 100 may be applied to a specific dual-battery mobile terminal. In the present application, the second battery 20 is connected in series with the first battery 10, so that the charging speed of the dual-battery charging device 100 can be improved, so that the mobile terminal can be quickly powered. In one embodiment, the first charging circuit D1 and the second charging circuit D2 can work simultaneously, and the first battery 10 and the second battery 20 with different capacitances can be charged synchronously. In other embodiments, the first charging circuit D1 may work alone, or the second charging circuit D2 may work alone, which is not limited herein.

In the embodiment of the present application, the charging interface 80 includes but is not limited to a USB interface, and an external power source can be connected to the charging interface 80, so that the charging interface 80 can simultaneously charge the first battery 10 and the second battery 20 through the first charging circuit D1, and The second charging circuit D2 separately charges the second battery 20 .

In one embodiment, please refer to FIG. 1 , the dual-battery charging device 100 includes a step-down module 82 , one end b1 of the step-down module 82 is connected to the positive electrode of the charging interface 80 , and the other end b2 of the step-down module 82 is connected to the first battery 10 . The negative electrode and the positive electrode of the second battery 20 .

In this way, the step-down module 82 can reduce the voltage between the charging interface 80 and the negative electrode of the first battery 10 . The step-down module 82 includes, but is not limited to, electronic components.

In another embodiment, please refer to FIG. 2 , the dual-battery charging device 100 includes a boosting module 84 , and one end b3 of the boosting module 84 is connected to the positive pole of the charging interface 80 , the negative pole of the first battery 10 and the positive pole of the second battery 20 . , the other end b4 of the boosting module 84 is connected to the positive electrode of the first battery 10 .

In this way, the boosting module 84 can boost the voltage between the positive electrode of the charging interface 80 and the positive electrode of the first battery 10 . The boost module 84 includes, but is not limited to, electronic components.

Specifically, in the following embodiments, the connection manner in which the dual-battery charging device 100 includes the step-down module 82 will be described.

In this embodiment of the present application, the first charging circuit D1 and the second charging circuit D2 can be connected to a charging chip, and the charging chip controls the charging interface 80 to simultaneously charge the first battery 10 and the second battery 20 through the first charging circuit D1 and to charge the first battery 10 and the second battery 20 through the first charging circuit D1. The second charging circuit D2 charges the second battery 20 alone, or the first charging circuit D1 and the second charging circuit D2 can be directly connected to an adapter, and the adapter directly charges the first battery 10 and the second battery 20, which is not limited herein.

Referring to FIG. 1, in the embodiment of the present application, the ratio of the sum of the charging current I1 of the first charging circuit D1 and the charging current I2 of the second charging circuit D2 (I1+I2) to the charging current I1 of the first charging circuit D1 is first ratio. The ratio of the electric capacity C2 of the second battery 20 to the electric capacity C1 of the first battery 10 is the second ratio. Wherein, the difference between the first ratio and the second ratio is within a preset ratio range. In this way, since the difference between the first ratio and the second ratio is within the preset ratio range, it can be ensured that the first battery 10 and the second battery 20 can be fully charged.

Specifically, in the embodiment of the present application, the difference between the first ratio and the second ratio is within the preset ratio range, and it can be understood that the difference between the first ratio and the second ratio is 0 or the difference is small, that is, , the first ratio and the second ratio are equal or close to each other. During the charging process, in an ideal state, the first ratio is equal to the second ratio. In an actual situation, the internal resistance of the battery may change dynamically with the amount of electricity, or be affected by temperature, and the difference between the first ratio and the second ratio will fluctuate within a preset ratio range.

In one embodiment, when the first ratio and the second ratio are equal, the electric capacity C1 of the first battery 10 is 1000 mAh, and the electric capacity C2 of the second battery 20 is 3000 mAh. The ratio of the electric capacity C2 of the second battery 20 to the electric capacity C1 of the first battery 10 is 3:1, that is, the second ratio is 3:1. In order to ensure that the first battery 10 and the second battery 20 can be fully charged, in the embodiment of the present application, the first ratio is also set to 3:1, that is, the charging current I1 of the first charging circuit D1 and the second charging The ratio of the sum of the charging currents I2 of the loop D2 (I1+I2) to the charging current I1 of the first charging loop D1 is 3:1. For example, the charging current of the first charging circuit D1 is I1, and the charging current of the second charging circuit D2 is I2, then (I1+I2): I1=3:1, thus obtaining the charging current of the second charging circuit D2 and the first charging current The ratio of the charging current of the charging circuit D1 is 2:1.

Referring to FIG. 3 , in the embodiment of the present application, the first charging circuit D1 includes a first charging chip 30 . The second charging circuit D2 includes a second charging chip 40 . The first charging chip 30 is connected in series with the first battery 10 and the second battery 20 , and is used to control the charging interface 80 to charge the first battery 10 and the second battery 20 . The second charging chip 40 is connected in series with the second battery 20 and is used to control the charging interface 80 to charge the second battery 20 . In this way, the first charging chip 30 can quickly control the charging interface 80 to charge the first battery 10 and the second battery 20 , and the second charging chip 40 can quickly control the charging interface 80 to charge the second battery 20 .

Specifically, the first charging chip 30 and the second charging chip 40 are chips that can be understood to be capable of controlling the charging of the battery.

In the embodiment of the present application, the second charging chip 40 and the step-down module 82 may be independent modules. In other embodiments, the second charging chip 40 and the step-down module 82 may be combined into one module, which is not described here. limited.

Likewise, the first charging chip 30 and the boosting module 84 may be independent modules. In other embodiments, the first charging chip 30 and the boosting module 84 may be combined into one module, which is not limited herein.

In the embodiment of the present application, the first charging chip 30 can control the charging interface 80 connected to the external power source to output current to the first charging circuit D1 and the second charging circuit D2 respectively. The present application can output different charging currents in the first charging circuit D1 and the second charging circuit D2 respectively according to the ratio of the electric capacity of the second battery 20 to the electric capacity of the first battery 10 . The ratio of the current output by the first charging chip 30 to the current output by the second charging chip 40 is related to the ratio of the electric capacity of the second battery 20 to the electric capacity of the first battery 10 .

Referring to FIG. 4 , in the embodiment of the present application, the dual-battery charging device 100 includes an equalization module 50 , the equalization module 50 is connected to the first battery 10 and the second battery 20 , and the equalization module 50 is used for equalizing the first battery 10 and the second battery 20 . voltage between. In this way, voltage equalization between the first battery 10 and the second battery 20 can be achieved.

Specifically, the equalization module 50 is used to equalize the voltage between the first battery 10 and the second battery 20 . It can be understood that the equalization module 50 is used to equalize the energy between the first battery 10 and the second battery 20 , that is, , energy can be transferred between the first battery 10 and the second battery 20 through the equalization module 50 .

In the embodiment of the present application, when the voltage of the second battery 20 is greater than the voltage of the first battery 10, and the difference between the voltage of the second battery 20 and the voltage of the first battery 10 is greater than the preset threshold, the equalization module 50 is used to utilize The second battery 20 charges the first battery 10 to equalize the voltage between the first battery 10 and the second battery 20 . In this way, the voltage of the second battery 20 can be lowered, and the voltage of the first battery 10 can be increased at the same time, so that the voltages of the first battery 10 and the second battery 20 can be balanced.

Specifically, the balancing module 50 is used to charge the first battery 10 with the second battery 20 . It can be understood that, through the balancing module 50 , the energy of the second battery 20 can be transferred to the first battery 10 , so that the first battery 10 The voltage of the battery increases, so that the voltages of the first battery 10 and the second battery 20 are balanced.

In the embodiment of the present application, when the voltage of the first battery 10 is greater than the voltage of the second battery 20, and the difference between the voltage of the first battery 10 and the voltage of the second battery 20 is greater than the preset threshold, the equalization module 50 is used to utilize The first battery 10 charges the second battery 20 to equalize the voltage between the first battery 10 and the second battery 20 . In this way, the voltage of the first battery 10 can be quickly decreased, and the voltage of the second battery 20 can be increased at the same time, so that the voltages of the first battery 10 and the second battery 20 can be balanced.

Specifically, the balancing module 50 is used to charge the second battery 20 by using the first battery 10 . It can be understood that, through the balancing module 50 , the energy of the first battery 10 can be transferred to the second battery 20 , so that the second battery 20 The voltage of the battery increases, so that the voltages of the first battery 10 and the second battery 20 are balanced.

Referring to FIG. 5 , in the embodiment of the present application, the equalization module 50 includes a first inductor L1, a second inductor L2, a first switch Q1, a second switch Q2 and a capacitor C, and the first inductor L1 is connected to the first battery 10, The first switch Q1 and the capacitor C, the second inductor L2 is connected to the second battery 20, the second switch Q2 and the capacitor C, and the capacitor C is connected to the first inductor L1, the first switch Q1, the second inductor L2 and the second switch Tube Q2. The equalization module 50 is used to control the on-off of the first switch transistor Q1 and the on-off of the second switch transistor Q2 to equalize the voltage between the first battery 10 and the second battery 20 .

In this way, the voltages between the first battery 10 and the second battery 20 can be balanced through the interaction between the first inductor L1 , the second inductor L2 , the first switching transistor Q1 , the second switching transistor Q2 and the capacitor C.

In the embodiment of the present application, when the voltage of the second battery 20 is greater than the voltage of the first battery 10 and the difference between the voltage of the second battery 20 and the voltage of the first battery 10 is greater than a preset threshold, the equalization module 50 is used to control the The second switch Q2 is turned on and the first switch Q1 is controlled to be turned off. After the first switch Q1 is turned off for a preset time period, the second switch Q2 is controlled to be turned off and the first switch Q1 is controlled to be turned on.

Specifically, in one embodiment, when the second switch Q2 is turned on and the first switch Q1 is turned off, the second battery 20 and the second inductor L2 form a first closed loop. The capacitor C, the first inductor L1, and the first battery 10 form a second closed loop. In the first closed loop, the second battery 20 provides energy to the second inductor L2 through the current of the first closed loop, so that the second inductor L2 stores energy. In the second closed loop, the capacitor C is discharged to provide energy to the first battery 10 and store energy for the first inductor L1.

When the second switch Q2 is turned off and the first switch Q1 is turned on, the second battery 20 , the second inductor L2 and the capacitor C form a third closed loop. The first inductor L1 and the first battery 10 form a fourth closed loop. In the third closed loop, the second battery 20 and the second inductor L2 provide energy to charge the capacitor C. In the fourth closed loop, the first inductor L1 releases the stored energy to the first battery 10 .

In the above process, the energy of the second battery 20 can be transferred to the first battery 10, so that when the difference between the voltage of the second battery 20 and the voltage of the first battery 10 is greater than a preset threshold, the first battery 10 and the first battery 10 are balanced. The voltage between the second batteries 20 .

In the embodiment of the present application, when the voltage of the first battery 10 is greater than the voltage of the second battery 20 and the difference between the voltage of the first battery 10 and the voltage of the second battery 20 is greater than a preset threshold, the equalization module 50 is used to control the The first switch Q1 is turned on and the second switch Q2 is controlled to be turned off. After the second switch Q2 is turned off for a preset time period, the first switch Q1 is controlled to be turned off and the second switch Q2 is controlled to be turned on.

Specifically, in one embodiment, when the first switch Q1 is turned on and the second switch Q2 is turned off, the first battery 10 and the first inductor L1 form a first closed loop. The capacitor C, the second inductor L2, and the second battery 20 form a second closed loop. In the first closed loop, the first battery 10 provides energy to the first inductor L1 through the current of the first closed loop, so that the first inductor L1 stores energy. In the second closed loop, the capacitor C is discharged to provide energy to the second battery 20 and store energy for the second inductor L2.

When the first switch Q1 is turned off and the second switch Q2 is turned on, the first battery 10 , the first inductor L1 and the capacitor C form a third closed loop. The second inductor L2 and the second battery 20 form a fourth closed loop. In the third closed loop, the first battery 10 and the first inductor L1 provide energy to charge the capacitor C. In the fourth closed loop, the second inductor L2 releases the stored energy to the second battery 20 .

In the above process, the energy of the first battery 10 can be transferred to the second battery 20, so that when the difference between the voltage of the first battery 10 and the voltage of the second battery 20 is greater than a preset threshold, the first battery 10 and the second battery 20 are balanced. The voltage between the second batteries 20 .

Referring to FIG. 6 and FIG. 7 , in the embodiment of the present application, the dual battery charging device 100 includes a first protection plate 60 and a second protection plate 70 . The first battery 10 is mounted on the first protection plate 60 . The second battery 20 is mounted on the second protection plate 70 . In this way, the first protection plate 60 protects the first battery 10 , and the second protection plate 70 protects the second battery 20 .

Specifically, in one embodiment, the voltage of the second battery 20 may be detected by a fuel gauge installed on the second protection board 70 . The voltage of the first battery 10 may be detected by a detection module outside the dual battery charging device 100 . In another embodiment, the dual-battery charging apparatus 100 includes a fuel gauge with four-terminal detection, and the fuel gauge can detect the voltage of the first battery 10 and the voltage of the second battery 20 at the same time. In yet another embodiment, the voltage of the first battery 10 and the voltage of the second battery 20 can also be simultaneously detected by a detection module outside the dual battery charging device 100 .

Referring to FIG. 6 , an embodiment of the present application further provides a mobile terminal 1000 . The mobile terminal 1000 includes a processor 110 and a dual-battery charging apparatus 100 . The processor 110 is connected to the first charging circuit D1 and the second charging circuit D2, the processor 110 is used to control the charging interface 80 to charge the first battery 10 and the second battery 20 through the first charging circuit D1, and is used to control the charging interface 80 The second battery 20 is charged through the second charging circuit D2.

In the mobile terminal 1000 of the above-mentioned embodiment, the electric capacity of the second battery 20 is greater than the electric capacity of the first battery 10. In the case that the first battery 10 and the second battery 20 are connected in series, the charging interface 80 passes through the first charging circuit. D1 simultaneously charges the first battery 10 and the second battery 20, and separately charges the second battery 20 through the second charging circuit D2, so as to ensure that both the first battery 10 and the second battery 20 with different electric capacities can be implemented. Fully charged, make full use of the battery's electric capacity to achieve a balanced full charge of the dual batteries.

Specifically, in the embodiment of the present application, the mobile terminal 1000 includes but is not limited to a mobile phone, a tablet computer, a notebook computer, and the like. The mobile terminal 1000 of the embodiment of the present application has two first batteries 10 and second batteries 20 with different electric capacities, and the first batteries 10 and the second batteries 20 are connected in series.

In this embodiment of the present application, the processor 110 includes, but is not limited to, a Microcontroller Unit (MCU, MCU), an application processor 110 (Application processor, AP), and the like.

Referring to FIG. 6 , the processor 110 is connected to the first charging chip 30 , the second charging chip 40 , the first battery 10 and the second battery 20 . The processor 110 may communicate with the first charging chip 30 and the second charging chip 40, respectively. The processor 110 can control the charging current of the first charging chip 30 and the charging current of the second charging chip 40 . The first battery 10 is mounted on the first protection plate 60 . The second battery 20 is mounted on the second protection plate 70 . A fuel gauge is installed on the second protection board 70 for detecting the voltage of the second battery 20 . The processor 110 includes a voltage detection module for detecting the voltage of the first battery 10 .

In one embodiment, please refer to FIG. 7 . FIG. 7 is a schematic diagram of a partial structure of a mobile terminal 1000 , and the mobile terminal 1000 is a mobile phone with a folding screen in a folded form. In FIG. 7 , the mobile terminal 1000 includes a processor 110 , a first casing 120 , a second casing 130 and a rotating shaft 140 . The rotating shaft 140 is connected to the first casing 120 and the second casing 130 , and the first battery 10 is assembled on the first casing 120 and the second casing 130 . A casing 120 . The second battery 20 is assembled in the second case 130 . The processor 110 is assembled in the first housing 120 . The first battery 10 is mounted on the first protective plate 60 , and the second battery 20 is mounted on the second protective plate 70 .

In FIG. 7 , in order to improve the battery life and make full use of the structural space of the folding screen mobile phone, a first battery 10 and a second battery 20 are provided. The electric capacity of the second battery 20 is greater than that of the first battery 10 . In this application, the first battery 10 and the second battery 20 can be charged at the same time, and the first battery 10 and the second battery 20 can be fully charged at the same time, so as to achieve a balanced full charge of the first battery 10 and the second battery 20 .

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," or the like, is meant to combine embodiments or A particular feature, structure, material, or characteristic of the example description is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Variations, modifications, substitutions and alterations are made to the implementation.

Claims (12)

1. A dual battery charging device, wherein the dual battery charging device comprises: the first battery; a second battery, the second battery is connected in series with the first battery, and the electric capacity of the second battery is greater than that of the first battery; a charging interface, the charging interface, the first battery and the second battery form a first charging circuit; the charging interface and the second battery form a second charging circuit; The charging interface charges the first battery and the second battery through the first charging circuit, and charges the second battery through the second charging circuit. 2 . The dual-battery charging device according to claim 1 , wherein the dual-battery charging device comprises a step-down module, one end of the step-down module is connected to the positive electrode of the charging interface, and the The other end is connected to the negative electrode of the first battery and the positive electrode of the second battery. 3 . The dual-battery charging device according to claim 1 , wherein the dual-battery charging device comprises a boosting module, and one end of the boosting module is connected to the positive electrode of the charging interface and the first battery. 4 . the negative electrode and the positive electrode of the second battery, and the other end of the boosting module is connected to the positive electrode of the first battery. 4 . The dual-battery charging device according to claim 1 , wherein the sum of the charging current of the first charging circuit and the charging current of the second charging circuit is the difference between the charging current of the first charging circuit and the charging current of the first charging circuit. The ratio is a first ratio; the ratio of the electric capacity of the second battery to the electric capacity of the first battery is a second ratio, and the difference between the first ratio and the second ratio is within a preset ratio range . 5 . The dual battery charging device according to claim 1 , wherein the first charging circuit comprises a first charging chip, the second charging circuit comprises a second charging chip; the first charging chip is connected to the second charging chip. 6 . The first battery and the second battery are connected in series, and are used to control the charging interface to charge the first battery and the second battery; the second charging chip is connected in series with the second battery, and is used for charging the first battery and the second battery. for controlling the charging interface to charge the second battery. 6 . The dual-battery charging device according to claim 1 , wherein the dual-battery charging device comprises an equalization module, the equalization module is connected to the first battery and the second battery, and the equalization module is used for for equalizing the voltage between the first battery and the second battery. 7 . The dual battery charging device according to claim 6 , wherein the voltage of the second battery is greater than the voltage of the first battery, and the voltage of the second battery is the same as the voltage of the first battery. 8 . When the voltage difference is greater than a preset threshold, the equalization module is configured to charge the first battery with the second battery, so as to equalize the voltage between the first battery and the second battery. 8 . The dual battery charging device according to claim 6 , wherein the voltage of the first battery is greater than the voltage of the second battery, and the voltage of the first battery is the same as the voltage of the second battery. 9 . When the difference in voltage is greater than a preset threshold, the equalization module is configured to charge the second battery by using the first battery, so as to equalize the voltage between the first battery and the second battery. 9 . The dual battery charging device according to claim 6 , wherein the equalization module comprises a first inductor, a second inductor, a first switch tube, a second switch tube and a capacitor, and the first inductor is connected to the the first battery, the first switch tube and the capacitor, the second inductor is connected to the second battery, the second switch tube and the capacitor, and the capacitor is connected to the first inductor, the capacitor the first switch tube, the second inductor and the second switch tube, and the equalization module is used to control the on-off of the first switch tube and the on-off of the second switch tube to balance the first switch tube The voltage between one battery and the second battery. 10 . The dual battery charging device according to claim 9 , wherein the voltage of the second battery is greater than the voltage of the first battery, and the voltage of the second battery is the same as the voltage of the first battery. 11 . When the voltage difference is greater than a preset threshold, the equalization module is used to control the second switch tube to be turned on and the first switch tube to be turned off, and after the first switch tube is turned off for a preset time period, control the The second switch tube is turned off and the first switch tube is turned on. 11 . The dual battery charging device according to claim 9 , wherein the voltage of the first battery is greater than the voltage of the second battery, and the voltage of the first battery is the same as the voltage of the second battery. 12 . When the difference between the voltages is greater than the preset threshold, the equalization module is used to control the conduction of the first switch tube and the disconnection of the second switch tube, and after the second switch tube is disconnected for a preset period of time, The first switch tube is controlled to be turned off and the second switch tube is controlled to be turned on. 12. A mobile terminal, characterized in that the mobile terminal comprises a processor and the dual-battery charging device according to any one of claims 1-11, wherein the processor is connected to the first charging circuit and the second charging circuit. Two charging circuits, the processor is used for controlling the charging interface to charge the first battery and the second battery through the first charging circuit, and for controlling the charging interface to pass through the second charging circuit Charge the second battery.

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