CN108988453B - a mobile terminal - Google Patents

Abstract

The present invention provides a mobile terminal, comprising: a first display screen; a second display screen and a third display screen which can be folded and arranged relative to each other, the second display screen and the first display screen are arranged opposite to each other; a first battery, a first battery Connected with the first display screen to supply power to the first display screen; the second battery, the second battery is connected to the second display screen and the third display screen, and supplies power to the second display screen and the third display screen; the switch circuit, the switch circuit The first end of the battery is connected to the first battery, and the second end is connected to the second battery; wherein, when the switch circuit is turned on, the first battery and the second battery are connected in parallel. The invention can effectively increase the total capacity of the battery of the mobile terminal and improve the battery life; the first battery and the second battery are connected in parallel through the conduction of the switch circuit to realize mutual charging between the two batteries, thereby further improving the battery life of the mobile terminal. battery life.

Description

a mobile terminal

technical field

The present invention relates to the field of electronic technology, and in particular, to a mobile terminal.

Background technique

With the continuous development of electronic technology, people's demand for using mobile terminals is far greater than other electronic products, and mobile terminals with foldable multi-screens are a trend of subsequent development.

For a mobile terminal that folds multiple screens, such as a double-sided screen mobile terminal or a multi-sided folding screen mobile terminal, its function and interest will become more and more powerful, and at the same time, the power consumption demand of the mobile terminal will also increase. In the prior art, a battery is mostly used for power supply, and it is difficult to meet the electricity demand of the mobile terminal when the terminal user performs high-frequency operation.

SUMMARY OF THE INVENTION

The present invention provides a mobile terminal to solve the problem that the foldable multi-screen mobile terminal in the prior art is difficult to meet the user's electricity demand during high-frequency operation.

In order to solve the above-mentioned technical problems, the present invention is achieved in this way:

An embodiment of the present invention provides a mobile terminal, including:

the first display screen;

a second display screen and a third display screen that can be folded over each other, and the second display screen is arranged opposite to the first display screen;

a first battery, which is connected to the first display screen and supplies power to the first display screen;

a second battery, the second battery is connected to the second display screen and the third display screen, and supplies power to the second display screen and the third display screen;

a switch circuit, the first end of the switch circuit is connected with the first battery, and the second end is connected with the second battery;

Wherein, when the switch circuit is turned on, the first battery is connected in parallel with the second battery.

In the embodiment of the present invention, the first battery is used to supply power to the first display screen, and the second battery is used to supply power to the second display screen and the third display screen, which can effectively increase the total battery capacity of the mobile terminal and improve the battery life; Conduction makes the first battery and the second battery connected in parallel to realize mutual charging between the two batteries, thereby further improving the battery life of the mobile terminal.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

FIG. 1 shows a schematic circuit diagram of a mobile terminal provided by an embodiment of the present invention;

FIG. 2 shows one of the schematic structural diagrams of a mobile terminal provided by an embodiment of the present invention;

FIG. 3 shows the second schematic structural diagram of a mobile terminal provided by an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 shows a schematic circuit diagram of a mobile terminal provided by an embodiment of the present invention according to an embodiment of the present invention.

Referring to FIG. 1, an embodiment of the present invention provides a mobile terminal, which may include:

the first display screen 101;

A second display screen 102 and a third display screen 103 that can be folded over each other, and the second display screen 102 is arranged opposite to the first display screen 101;

a first battery 111, the first battery 111 is connected to the first display screen 101 and supplies power to the first display screen 101;

The second battery 112, the second battery 112 is connected to the second display screen 102 and the third display screen 103, and supplies power to the second display screen 102 and the third display screen 103;

The switch circuit 120, the first end of the switch circuit 120 is connected to the first battery 111, and the second end is connected to the second battery 112;

Wherein, when the switch circuit 120 is turned on, the first battery 111 and the second battery 112 are connected in parallel.

In the embodiment of the present invention, the first battery 111 and the second battery 112 are used to separately supply power to each display screen, that is, the first battery 111 supplies power to the first display screen 101, and the second battery 112 supplies power to the second display screen 102 and the first display screen 101. The three display screens 103 are powered by power, which can improve the battery life of the mobile terminal; and the switch circuit 120 is used as a connection bridge between the first battery 111 and the second battery 112, so that the connection between the first battery 111 and the second battery 112 can be Connected to each other, that is, when the switch circuit 120 is turned on, the first battery 111 and the second battery 112 are connected in parallel, so that the first battery 111 and the second battery 112 can be charged with each other, that is, the first battery 111 and the second battery 112. The battery with the higher voltage value among the two batteries 112 can charge the other battery.

Specifically, in the embodiment of the present invention, when the difference between the voltage values of the first battery 111 and the second battery 112 meets a preset threshold, the switch circuit 120 can be turned on, so as to realize the first battery 111 and the second battery 112 Charge each other and ensure that the voltage difference between the two batteries is as small as possible.

In this embodiment of the present invention, the second display screen 102 and the third display screen 103 can be folded over each other, that is, the second display screen 102 can be in a first position facing the third display screen 103 and in contact with each other and the second position away from the third display screen 103, as shown in FIG. 2 and FIG. 3 . Specifically, when the second display screen 102 and the third display screen 103 are in the first position, the display screen of the first display screen 101 is oriented in the same direction as the display screen of the third display screen 103 , and the display screen of the second display screen 102 is oriented in the same direction as the display screen of the third display screen 103 . The orientation is opposite to that of the third display screen 103. At this time, the mobile terminal is in a folded state, and only the first display screen 101 is exposed; when the second display screen 102 and the third display screen 103 are in the second position, the first display screen The orientation of the display screen of the screen 101 is opposite to the orientation of the display screen of the third display screen 103, and the orientation of the display screen of the second display screen 102 is the same as the orientation of the display screen of the third display screen 103. At this time, the mobile terminal is in the unfolded state, and the second display screen The screen 102 and the third display screen 103 are revealed, unfolding into a complete display screen.

In addition, in this embodiment of the present invention, the first display screen 101 is an independent display screen; the second display screen 102 and the third display screen 103 may be independent display screens, or may be a complete display screen, That is, the second display screen 102 and the third display screen 103 are two parts of a complete display screen. In this case, the complete display screen may be a flexible display screen.

In this embodiment of the present invention, the first battery 111 is used to supply power to the first display screen 101, and the second battery 112 is used to supply power to the second display screen 102 and the third display screen 103, which can effectively increase the total battery capacity of the mobile terminal and improve the battery life. ; Through the conduction of the switch circuit 120, the first battery 111 and the second battery 112 are connected in parallel to achieve mutual charging between the two batteries, thereby further improving the battery life of the mobile terminal.

Wherein, in order to better control the on and off of the switch circuit 120, in a preferred embodiment of the present invention, the mobile terminal may further include: a power management circuit 130, the power management circuit 130 is respectively connected with the first battery 111, The second battery 112 is connected to the switch circuit 120; the power management circuit 130 obtains the first voltage value of the first battery 111 and the second voltage value of the second battery 112 respectively, and controls the switch according to the first voltage value and the second voltage value Circuit 120 is turned on or off. In this way, in the embodiment of the present invention, the power management circuit 130 controls the switch circuit 120 to be turned on or off according to the first voltage value of the first battery 111 and the second voltage value of the second battery 112, so that the voltage of the two batteries can be adjusted between the voltages of the two batteries. When the difference of the values satisfies the preset threshold, the first battery 111 and the second battery 112 are connected to realize mutual charging, and the voltage difference between the two batteries can be ensured as small as possible.

Wherein, in this embodiment of the present invention, the power management circuit 130 may be a power management integrated circuit (Power Management IC, PMIC).

Preferably, in the embodiment of the present invention, when the first battery 111 and the second battery 112 supply power and the difference between the voltage values of the two batteries satisfies the first threshold, the switch circuit can be turned on, so as to realize the first battery 111 and the second battery 112 for mutual charging.

Specifically, in the embodiment of the present invention, the power management circuit 130 controls the switch circuit 120 to be turned on when the second battery 112 is in a discharging state and detects that the difference between the first voltage value and the second voltage value is greater than the first threshold value . In this embodiment of the present invention, considering that in the use of the mobile terminal, since the second battery 112 supplies power to the second display screen 102 and the third display screen 103, the power consumption thereof will be greater than the power consumption of the first battery 111, therefore, The power management circuit 130 detects whether the difference between the first voltage value and the second voltage value is greater than the first voltage value when the second battery 112 is in a discharging state, specifically when the second battery 112 supplies power to the second display screen 102 and the third display screen 103 . a threshold value, and when it is detected that the difference between the first voltage value and the second voltage value is greater than the first threshold value, the switch circuit 120 is controlled to be turned on, so that the first battery 111 and the second battery 112 are connected to realize the first battery 111 and the mutual charging of the second battery 112 . Of course, when the first battery 111 supplies power to the first display screen 101 and detects that the difference between the first voltage value and the second voltage value is greater than the first threshold, the power management circuit 130 also controls the switch circuit 120 to be turned on, so that the The first battery 111 and the second battery 112 are connected.

Specifically, in the embodiment of the present invention, when the mobile terminal is in a folded state, only the first display screen 101 only needs to work, and the second display screen 102 and the third display screen 103 do not work, and the first display screen 111 is used for the first display screen. The screen 101 is powered. At this time, when the power management circuit 130 detects that the difference between the first voltage value and the second voltage value is greater than the first threshold value, the control switch circuit 120 is turned on; when the mobile terminal is in the unfolded state, the second display screen 102 It works with the third display screen 103, and supplies power to the second display screen 102 and the third display screen 103 through the second battery 112. At this time, the power management circuit 130 detects that the difference between the first voltage value and the second voltage value is greater than the first voltage value. At a threshold value, the control switch circuit 120 is turned on. Here, if the first display screen 101 is also in the working state, the first display screen 101 is powered by the first battery 111 at the same time.

In addition, in a preferred embodiment of the present invention, in order to more conveniently detect the voltage values of the first battery 111 and the second battery 112, a fuel gauge is provided inside the first battery 111 and the second battery 112, respectively. The voltage values of the first battery 111 and the second battery 112 are respectively detected, and the power management circuit 130 is connected to the first battery 111 and the second battery 112 respectively, and receives the detection of the fuel gauge set in the first battery 111 and the second battery 112. to obtain the first voltage value of the first battery 111 and the second voltage value of the second battery 112 .

In a preferred embodiment of the present invention, the mobile terminal may further include: a charging interface 140, which is connected to a peripheral charging device; a charging circuit 150, which is respectively connected to the charging interface 140, the first battery 111 and the second battery 112. connect. In the embodiment of the present invention, when the external charging device is connected to the charging interface 140 of the mobile terminal and the charging is realized, the charging circuit 150 is used to realize the charging of the first battery 111 and the second battery 112. Here, the first battery 111 and the second battery 112 are charged. The two batteries 112 are independently charged through the charging circuit 150 , so as to improve the charging efficiency of the first battery 111 and the second battery 112 .

Preferably, in this embodiment of the present invention, the charging circuit 150 may include: a first charging circuit 151 , the input end of the first charging circuit 151 is connected to the charging interface 140 , and the output end of the first charging circuit 151 is connected to the first battery 111 The second charging circuit 152, the input end of the second charging circuit 152 is connected to the charging interface 140, and the output end of the second charging circuit 152 is connected to the second battery 112. In the embodiment of the present invention, through the first charging circuit 151 and the second charging circuit 152, the first battery 111 and the second battery 112 are respectively charged using independent charging paths, so as to realize the fast and independent charging of the two batteries respectively, Thus, the charging efficiency of the first battery 111 and the second battery 112 can be improved.

In the embodiment of the present invention, when the first battery 111 and the second battery 112 are in a charged state, and the difference between the voltage values of the two batteries satisfies the second threshold, the switch circuit 120 can be turned on, thereby realizing the trickle of the two batteries. current charge and balance the voltage difference between the two batteries.

Specifically, in this embodiment of the present invention, when the first battery 111 and the second battery 112 are in the charging state, and the difference between the first voltage value and the second voltage value is detected to be less than or equal to the second threshold, the power management circuit 130 , The control switch circuit 120 is turned on. In this embodiment of the present invention, the power management circuit 130 controls the switch circuit 120 to turn off when the first battery 111 and the second battery 112 are in a charged state and the difference between the first voltage value and the second voltage value is detected to be greater than the second threshold value. turn on, so that the first battery 111 and the second battery 112 can be charged independently to ensure the charging efficiency of the two batteries; the power management circuit 130 is in the charging state when the first battery 111 and the second battery 112 are in the charging state, and detects the first voltage value and When the difference between the second voltage values is less than or equal to the second threshold value, the control switch circuit 120 is turned on, so that the first battery 111 and the second battery 112 are connected in parallel to realize trickle charging of the two batteries and balance the voltage difference between the two batteries . Further, in order to ensure the charging effect of the two batteries, the trickle charging of the two batteries is realized when the voltage values of the first battery 111 and the second battery 112 reach a certain level. and the second battery 112 are in the charging state, and when it is detected that the first voltage value and the second voltage value are respectively greater than the fourth threshold value, and the difference between the first voltage value and the second voltage value is less than or equal to the second threshold value, control the switch circuit 120 is turned on; in this way, the charging efficiency of the two batteries can be better ensured, and the two batteries can be fully charged as much as possible.

In addition, if the first battery 111 and the second battery 112 are charged, they also supply power to the corresponding display screens, that is, the first display screen 101, the second display screen 102 and/or the third display screen 103 are in the first battery 111 and the second battery 112 work when charging, at this time, the power management circuit 130 is used to determine, according to the first voltage value and the second voltage value, that the first voltage value and the second voltage value are respectively greater than the fifth threshold, and the first When the voltage difference between the voltage value and the second voltage value is less than or equal to the second threshold value, the switch circuit 120 is controlled to be turned on. In this way, the charging efficiency of the two batteries can be ensured, the sufficient battery power of the two batteries can be ensured, and the trickle charging can be realized when the two batteries have sufficient power.

In addition, in the embodiment of the present invention, the mobile terminal may further include: an overvoltage protection circuit (OVP) 160, the overvoltage protection circuit 160 is connected between the charging interface 140 and the charging circuit 150 to realize overvoltage protection and ensure the charging interface 140 outputs a stable voltage to the charging circuit 150 .

In a preferred embodiment of the present invention, the mobile terminal may further include: a central processing unit (Central Processing Unit, CPU) 170, and the central processing unit 170 is connected to the first display screen 101, the second display screen 102, and the third display screen respectively. 103. The power management circuit 130 and the charging circuit 150 are connected. Specifically, the central processing unit 170 is respectively connected to the first display screen 101, the second display screen 102, the third display screen 103 and the power management circuit 130, and is used for receiving the folded state of the mobile terminal and user operation instructions, and determining to light up the first display screen 101. A display screen 101, a second display screen 102 and/or a third display screen 103, that is, it is determined that the first display screen 101, the second display screen 102 and/or the third display screen 103 are working, and the display is turned on (working) In addition, when the central processing unit 170 determines that the first display screen 101, the second display screen 102 and/or the third display screen 103 are working, the central processing unit 170 sends a power supply instruction to the power management circuit 130, so that the power management circuit 130 controls the first battery 111 and/or the second battery 112 to supply power to the corresponding display screen. In addition, when the power management circuit 130 controls the switching circuit 120 to be turned on or off according to the first voltage value and the second voltage value, the central processing unit 170 can be combined to achieve a better control effect. Specifically, the power management circuit 130 judges whether to turn on or off the switch circuit 120 according to the first voltage value and the second voltage value, and sends the judgment information to the central processing unit 170, and the central processing unit 170 receives the judgment information and sends the corresponding control command, and the power management circuit After receiving the control instruction sent by the central processing unit 170 , 130 controls the switch circuit 120 to be turned on or off. In addition, the central processing unit 170 is connected to the charging circuit 150 for sending charging instructions to the charging circuit 150 to respectively control different states of the charging paths for charging the first battery 111 and the second battery 112 .

Wherein, in a preferred embodiment of the present invention, the switch circuit 120 may include: a switch 121, the switch 121 is connected to the power management circuit 130; the power management circuit 130 controls the switch 121 to close or disconnect. In this embodiment of the present invention, the switch circuit 120 is turned on and off by closing and disconnecting the switch 121 , so that when the switch 121 is closed, the first battery 111 and the second battery 112 can be connected to each other.

In addition, in a preferred embodiment of the present invention, the switch circuit 120 may further include: a detection circuit 122, the detection circuit 122 is connected to the power management circuit 130; the detection circuit 122 is used to detect when the switch circuit 120 is turned on. The value of the current flowing through the switch circuit 120 . Specifically, when the switch 121 is closed, the detection circuit 122 detects the current value flowing through the switch circuit 120 and sends it to the power management circuit 130. The power management circuit 130 controls the switch 121 to turn off when the current value is less than or equal to the third threshold. . In this way, through the current value detected by the detection circuit 122, the power management circuit 130 is in a charging state when the first battery 111 and the second battery 112, and the current value is less than or equal to the third threshold, that is, the first battery 111 and the second battery When the voltage values of 112 are balanced, the control switch 121 is turned off, so that the switch circuit 120 is turned off.

Wherein, the detection circuit 122 may include: a detection resistor R, two ends of the detection resistor R are respectively connected to the power management circuit 130, so as to realize the detection of the current value flowing through the switch circuit 120 when the switch circuit 120 is turned on; and , through the detection resistor R, the current limiting effect on the switch circuit 120 can also be realized.

In addition, in this embodiment of the present invention, the mobile terminal may further include: a first driving circuit 181 and a second driving circuit 182; the first driving circuit 181 is connected between the first battery 111 and the first display screen 101, A driving circuit 181 is used to provide a working voltage for the first display screen 101 ; the second driving circuit 182 is connected between the second battery 112 and the second display screen 102 and the third display screen 103 , and the second driving circuit 182 uses In order to realize providing the working voltage for the second display screen 102 and the third display screen 103 .

In a preferred embodiment of the present invention, the mobile terminal may further include: a first casing and a second casing. Here, the support and fixation of the first display screen 101 , the second display screen 102 and the third display screen 103 are realized through the first casing and the second casing, and the first battery 111 , the first display screen 111 and the third display screen 103 in the embodiment of the present invention are realized. The two batteries 112 , the charging interface 140 , the switch circuit 120 , the power management circuit 130 , the charging circuit 150 and other electronic components are accommodated and arranged.

Preferably, in the embodiment of the present invention, the first display screen 101 and the second display screen 102 are respectively attached to the two sides of the first casing, and the third display screen 103 is attached to the second casing; the first battery 111 is accommodated in the first casing, the second battery 112 is accommodated in the second casing, and the charging interface 140 is disposed in the second casing.

In the embodiment of the present invention, the first casing and the second casing can be folded over each other, so that the second display screen 102 can be in the first position facing the third display screen 103 and in contact with each other and with the third display screen 103 in the first position. The three display screens move between the second positions away from each other.

In the embodiment of the present invention, the third display screen 103 is attached to the second casing, the charging interface 140 and the second battery 112 are disposed on the second casing, and the second display screen 102 is formed by the second battery 112 and the third display screen 103 to supply power, the first display screen 101 is attached to the first casing, the first battery 111 is disposed in the first casing, and the first display screen 101 is powered by the first battery 111, so that the The length of the power supply path through which the two batteries are used to supply power to the respective display screens reduces the power supply voltage ripple and thus reduces the temperature rise. In addition, the main board can be preferably accommodated inside the second casing, and the main board can be powered by the second battery 112, so that the length of the power supply path from the battery to the main board can be reduced, the power supply voltage ripple can be reduced, and the temperature rise can be reduced. .

In addition, in this embodiment of the present invention, the mobile terminal may be a mobile phone or a tablet computer. Of course, the mobile terminal is not limited to a mobile phone and a tablet computer, and it can also be an electronic device such as a laptop computer (Laptop Computer) or a personal digital assistant (Personal Digital Assistant, PDA).

In addition, in the embodiment of the present invention, other basic structures of the mobile terminal are not specifically limited. For example, the mobile terminal may further include a series of basic components such as an earpiece, a speaker, a microphone, a camera, etc., which are not specified in this embodiment of the present invention. Repeat them one by one.

In the mobile terminal provided in the embodiment of the present invention, the first battery is used to supply power to the first display screen, and the second battery is used to supply power to the second display screen and the second display screen, which can effectively increase the total battery capacity of the mobile terminal and improve the battery life; The conduction of the switch circuit enables the first battery and the second battery to be connected in parallel to realize mutual charging between the two batteries, thereby further improving the battery life of the mobile terminal.

It should be understood that, in the description of the specification, references to the terms "one embodiment", "one embodiment" or "some embodiments" mean that a particular feature, structure or characteristic associated with the embodiments is included in at least one of the present invention examples or examples. Thus, appearances of "in one embodiment," "in one embodiment," or "in some embodiments" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, elements, structures or features described in one figure or embodiment of the invention may be combined in any suitable manner with elements, structures or features shown in one or more other figures or embodiments .

It should be noted that, in one or more embodiments herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, An article or apparatus includes not only those elements, but also other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and "arranged" should be understood in a broad sense, for example, it may be a fixed connection or a It can be a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the 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 present invention can be understood according to specific situations.

Additionally, the present invention may repeat reference numerals and/or letters in different embodiments or examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed.

Furthermore, in embodiments of the invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply a relationship between these entities or operations There is no such actual relationship or sequence.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of the present invention, without departing from the spirit of the present invention and the scope protected by the claims, many forms can be made, which all belong to the protection of the present invention.

Claims (8)

1. a mobile terminal, is characterized in that, comprises: the first display screen; a second display screen and a third display screen that can be folded over each other, and the second display screen is arranged opposite to the first display screen; a first battery, which is connected to the first display screen and supplies power to the first display screen; a second battery, the second battery is connected to the second display screen and the third display screen, and supplies power to the second display screen and the third display screen; a switch circuit, a first end of the switch circuit is connected to the first battery, and a second end of the switch circuit is connected to the second battery; Wherein, when the switch circuit is turned on, the first battery is connected in parallel with the second battery; a power management circuit, the power management circuit is respectively connected with the first battery, the second battery and the switch circuit and obtains the first voltage value of the first battery and the second voltage value of the second battery respectively, so The power management circuit controls the power supply when the first battery and the second battery are in a charged state and detects that the difference between the first voltage value and the second voltage value is less than or equal to a second threshold The switch circuit is turned on, and when it is detected that the difference between the first voltage value and the second voltage value is greater than a second threshold value, the switch circuit is controlled to be turned off. 2. The mobile terminal according to claim 1, wherein, The power management circuit controls the switch circuit to be turned on when the second battery is in a discharge state and detects that the difference between the first voltage value and the second voltage value is greater than a first threshold. 3. The mobile terminal according to claim 1, further comprising: Charging interface, connected with peripheral charging equipment; A charging circuit, the charging circuit is respectively connected with the charging interface, the first battery and the second battery. 4. The mobile terminal according to claim 3, wherein the charging circuit comprises: a first charging circuit, the input end of the first charging circuit is connected to the charging interface, and the output end of the first charging circuit is connected to the first battery; The second charging circuit, the input terminal of the second charging circuit is connected to the charging interface, and the output terminal of the second charging circuit is connected to the second battery. 5. The mobile terminal according to claim 3, further comprising: The central processing unit is connected with the first display screen, the second display screen, the third display screen, the power management circuit and the charging circuit respectively. 6. The mobile terminal according to claim 1, wherein the switch circuit comprises: a switch, the switch is connected to the power management circuit; The power management circuit controls the switch to be turned on or off according to the first voltage value and the second voltage value. 7. The mobile terminal according to claim 6, wherein the switch circuit further comprises: a detection circuit, the detection circuit is connected with the power management circuit; When the switch is closed, the detection circuit detects the current value flowing through the switch circuit and sends it to the power management circuit, and the power management circuit controls the current value when the current value is less than or equal to a third threshold value The switch is open. 8. The mobile terminal of claim 3, further comprising: a first casing and a second casing; The first display screen and the second display screen are respectively attached to two sides of the first casing, and the third display screen is attached to the second casing; The first battery is accommodated in the first casing, the second battery is accommodated in the second casing, and the charging interface is disposed in the second casing.

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