Charging and discharging circuit and electronic equipment

Abstract

The utility model discloses a charging and discharging circuit and electronic equipment. According to the charging and discharging circuit, the target processing mode needing to be adopted for the initial discharging voltage at present is determined according to the size relation between the initial discharging voltage output by the battery module and the discharging voltage threshold value, so that the initial discharging voltage is converted into the target discharging voltage through the target processing mode and the target discharging voltage is output to the load; the target processing mode comprises a step-up processing mode, a step-down processing mode or a direct connection processing mode, that is, the initial discharge voltage can be processed by the discharge branch no matter whether the initial discharge voltage is greater than the discharge voltage threshold or less than the discharge voltage threshold, so that the initial discharge voltage is converted into the target discharge voltage meeting the load work; and the discharging branch and the charging branch are mutually independent, so that the problem of instability of simultaneous charging and discharging under the condition that the initial discharging voltage is smaller than the discharging voltage threshold value can be solved, and the stability of the charging and discharging circuit is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to charging and discharging technology, and relate to but are not limited to a charging and discharging circuit and an electronic device. Background Art

[0002] As the functions of electronic devices such as smart terminals and electric vehicles have been continuously enhanced in recent years, higher requirements have been placed on the charging and discharging functions of batteries.

[0003] At present, most batteries made of specific materials can reduce the discharge voltage threshold depth of the battery from 3.4V to 3.0V, or even to 2.5V. Specific materials such as ternary polymer lithium, lithium cobalt oxide and silicon can effectively improve the energy density of the battery and achieve better battery capacity in the same space. However, in the existing charging and discharging schemes, although the battery charging speed can be increased by adjusting the charging rate, it can only be executed when the battery voltage is greater than the discharge voltage threshold (for example, 3.4V), and cannot solve the charging and discharging problem when the battery voltage is below the discharge voltage threshold. Utility Model Content

[0004] In view of this, the charging and discharging circuit and electronic device provided in the embodiments of the present application can supply power to the load and charge the battery according to the charging voltage regardless of whether the battery voltage is greater than or lower than the discharge voltage threshold.

[0005] In a first aspect, an embodiment of the present application provides a charging and discharging circuit, the circuit comprising a battery module, a charging branch and a discharging branch, the charging branch is connected to the battery module, and the discharging branch is respectively connected to a load and the battery module, wherein:

[0006] The battery module is used to store or release electricity;

[0007] The charging branch is used to convert the initial charging voltage output by the charging device into a target charging voltage when connected to the charging device, and transmit the target charging voltage to the battery module;

[0008] The discharge branch is used to determine a target processing method according to the relationship between the initial discharge voltage output by the battery module and the discharge voltage threshold, and convert the initial discharge voltage into a target discharge voltage through the target processing method and output it to the load. The target processing method includes a boost processing method, a buck processing method and a direct-through processing method.

[0009] In one embodiment, the discharge branch includes a control module and a voltage regulating module, and the control module is connected to the voltage regulating module, wherein:

[0010] The control module is used to generate and send a control instruction to the voltage regulating module according to the magnitude relationship between the initial discharge voltage and the discharge voltage threshold, so as to control the voltage regulating module to operate in a target operating mode;

[0011] The voltage regulating module is used to operate in the target operating mode under the control of the control module, and the target operating mode includes a boost mode for boosting the initial discharge voltage to a target range corresponding to the discharge voltage threshold, or a pass-through mode for outputting the initial discharge voltage, or a step-down mode for stepping down the initial discharge voltage to a target range corresponding to the discharge voltage threshold.

[0012] In one embodiment, the battery module includes a battery and a battery management unit, and the battery management unit is connected to the battery, the charging branch and the discharging branch respectively, wherein:

[0013] The battery management unit is used to transmit the target charging voltage to the battery module according to the current voltage of the battery module, or transmit the initial discharge voltage to the discharge branch, or transmit the target charging voltage to the discharge branch.

[0014] In one embodiment, the battery module further includes a switch unit, and the switch unit is connected to the battery management unit and the battery respectively, wherein:

[0015] The switch unit is used to determine whether to conduct the connection between the battery management unit and the battery according to the current current of the load and a preset first threshold;

[0016] Wherein, when the current current of the load is greater than or equal to a first threshold value, the switch unit disconnects the connection between the battery management unit and the battery to use the target charging voltage as the initial discharge voltage; when the current current of the load is less than the first threshold value, the switch unit turns on the connection between the battery management unit and the battery to use the output voltage of the battery as the initial discharge voltage.

[0017] In one of the embodiments, the switching unit is also used to turn on the connection between the battery management unit and the battery when the current current of the load is greater than a second threshold value, so as to use part or all of the output voltage of the battery and the target charging voltage as the initial discharge voltage, and the second threshold value is greater than the first threshold value.

[0018] In one of the embodiments, the switch unit is further used to conduct the connection between the battery management unit and the battery when not connected to the charging device, so as to supply power to the load through the battery.

[0019] In one embodiment, the switch unit includes a field effect transistor.

[0020] In one of the embodiments, the voltage regulation module includes a buck-boost circuit or a boost bypass circuit.

[0021] In one embodiment, the battery module includes a ternary polymer lithium battery cell.

[0022] In a second aspect, the present application provides an electronic device, wherein the electronic device comprises the charging and discharging circuit described in the first aspect.

[0023] In the above-mentioned charge and discharge circuit, the target processing method to be currently adopted for the initial discharge voltage is determined according to the magnitude relationship between the initial discharge voltage output by the battery module and the discharge voltage threshold, so that the initial discharge voltage is converted into the target discharge voltage through the target processing method and output to the load. The target processing method includes a boost processing method, a buck processing method or a direct processing method, that is, the discharge branch can process the initial discharge voltage regardless of whether the initial discharge voltage is greater than the discharge voltage threshold or less than the discharge voltage threshold, so as to convert it into a target discharge voltage that meets the load operation, so as to make the load work stably, and the discharge branch and the charging branch are independent of each other, which can solve the instability problem of simultaneous charging and discharging when the initial discharge voltage is less than the discharge voltage threshold, thereby improving the stability of the charge and discharge circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0025] Figure 1 A schematic diagram of the structure of a charging system provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a charging and discharging circuit provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of a charging and discharging circuit provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a charging and discharging circuit provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a charging and discharging circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0032] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0033] It should be pointed out that the terms "first\second\third" involved in the embodiments of the present application are used to distinguish similar or different objects, and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0034] Figure 1 This is a schematic diagram of the structure of a charging system provided in an embodiment of the present application. Figure 1 As shown, the charging system includes an electronic device and a charging device 20. When the charging device 20 is connected to the electronic device, the charging device 20 outputs an initial charging current to the electronic device so that the electronic device charges the battery of the electronic device according to the initial charging current. After the electronic device receives the initial charging current, the charging and discharging circuit processes the initial charging current so that the processed charging current meets the charging requirements of the battery. During the normal operation of the electronic device, the battery of the electronic device will output a discharge voltage to the load 101 in the electronic device through the charging and discharging circuit so that the load 101 can operate normally.

[0035] In the implementation process, the electronic device can be various types of devices with information processing capabilities. For example, the electronic device can include a personal computer, a laptop, a PDA or a server, etc.; the electronic device can also be a mobile terminal, for example, the mobile terminal can include a mobile phone, a car computer, a tablet computer or a projector, etc. The function implemented by the method can be implemented by calling the program code by the processor in the electronic device. Of course, the program code can be stored in a computer storage medium. It can be seen that the electronic device at least includes a processor and a storage medium.

[0036] Figure 2 This is a schematic diagram of a charging and discharging circuit provided in an embodiment of the present application. Figure 2 As shown, the charge and discharge circuit can be applied to Figure 1 In the electronic device in the embodiment, the charging and discharging circuit includes a battery module 104, a charging branch 103 and a discharging branch 102, the charging branch 103 is connected to the battery module 104, and the discharging branch 102 is connected to the load 101 and the battery module 104 respectively, wherein:

[0037] A battery module 104, used to store or release electricity;

[0038] The charging branch 103 is used to convert the initial charging voltage output by the charging device 20 into a target charging voltage when connected to the charging device 20, and transmit the target charging voltage to the battery module 104;

[0039] The discharge branch 102 is used to determine a target processing method according to the relationship between the initial discharge voltage output by the battery module 104 and the discharge voltage threshold, and convert the initial discharge voltage into a target discharge voltage through the target processing method and output it to the load 101. The target processing method includes a boost processing method, a buck processing method and a direct-through processing method.

[0040] During the charging process, when the charging device 20 is connected to the charging branch 103, the charging branch 103 converts the initial charging voltage output by the charging device 20 into a target charging voltage that meets the charging requirements of the battery module 104 and outputs it to the battery module 104, and then the battery module 104 is charged according to the received target charging voltage.

[0041] During the discharge process, the discharge branch 102 first detects the initial discharge voltage output by the battery module 104. If the initial discharge voltage is greater than the discharge voltage threshold, the initial discharge voltage is stepped down to obtain a target discharge voltage within the threshold range corresponding to the discharge voltage threshold. If the initial discharge voltage is less than the discharge voltage threshold, the initial discharge voltage is stepped up to obtain a target discharge voltage within the threshold range corresponding to the discharge voltage threshold. If the initial discharge voltage is equal to the discharge voltage threshold, the initial discharge voltage is directly output as the target discharge voltage. Therefore, regardless of the size of the initial discharge voltage output by the battery module 104, the load 101 can receive the target discharge voltage within the threshold range corresponding to the discharge voltage threshold, thereby improving the discharge stability.

[0042] Optionally, the battery module 104 may be a battery or a battery cell.

[0043] Optionally, the battery module 104 may include at least one battery connected in series. In other words, in the embodiment of the present application, at least one battery cell connected in series is packaged into a single battery, so that the battery module 104 is formed by a single battery; at least one battery cell connected in series may also be packaged into multiple batteries, so that the battery module 104 is formed by multiple batteries. For example, the battery module 104 may be a battery, which includes a first battery cell a and a second battery cell b connected in series. For another example, the battery module 104 may be two batteries, one of which includes a first battery cell a and the other includes a second battery cell b.

[0044] Optionally, the charging branch 103 may adopt common charging processing means in related technologies, such as current control and voltage adjustment, to convert the initial charging current output by the charging device 20 into a target charging current that satisfies the operation of the battery module 104 .

[0045] Optionally, the specific value of the above-mentioned discharge voltage threshold is set by a person skilled in the art according to actual conditions, and may be the voltage output when the battery power is lower than the minimum power, such as 3.4V, and this application does not impose any limitation thereto.

[0046] In the above-mentioned charge and discharge circuit, the target processing method to be currently adopted for the initial discharge voltage is determined according to the magnitude relationship between the initial discharge voltage output by the battery module 104 and the discharge voltage threshold, so that the initial discharge voltage is converted into the target discharge voltage through the target processing method and output to the load 101. The target processing method includes a boost processing method, a buck processing method or a direct processing method, that is, the discharge branch 102 can process the initial discharge voltage regardless of whether the initial discharge voltage is greater than the discharge voltage threshold or less than the discharge voltage threshold, so as to convert it into a target discharge voltage that meets the operation of the load 101, so that the load 101 can operate stably, and the discharge branch 102 and the charging branch 103 are independent of each other, and can solve the instability problem of simultaneous charging and discharging when the initial discharge voltage is less than the discharge voltage threshold, thereby improving the stability of the charge and discharge circuit.

[0047] In one embodiment, if Figure 2 As shown, the discharge branch 102 includes a control module 1021 and a voltage regulating module 1022, and the control module 1021 and the voltage regulating module 1022 are connected, wherein:

[0048] The control module 1021 is used to generate and send a control instruction to the voltage regulating module 1022 according to the magnitude relationship between the initial discharge voltage and the discharge voltage threshold, so as to control the voltage regulating module 1022 to operate in a target operating mode;

[0049] The voltage regulating module 1022 is used to operate in a target operating mode under the control of the control module 1021. The target operating mode includes a boost mode for boosting the initial discharge voltage to a target range corresponding to a discharge voltage threshold, or a pass-through mode for outputting the initial discharge voltage, or a buck mode for bucking the initial discharge voltage to a target range corresponding to the discharge voltage threshold.

[0050] During the implementation process, the control module 1021 first detects the initial discharge voltage, and after determining the magnitude relationship between the initial discharge voltage and the discharge voltage threshold, generates a corresponding control instruction, and sends the control instruction to the voltage regulation module 1022, thereby controlling the voltage regulation module 1022 to operate in the target operating mode.

[0051] Optionally, the control module 1021 may include a voltage detection unit and a processing unit, the voltage detection unit is used to detect the initial discharge voltage, and the processing unit is used to obtain and generate and send a control instruction to the voltage regulation module 1022 based on the magnitude relationship between the initial discharge voltage and the discharge voltage threshold.

[0052] In one embodiment, the voltage regulating module 1022 may include a buck-boost circuit or a boost bypass circuit. If the voltage regulating module 1022 is a buck-boost circuit, the voltage regulating module 1022 may buck the initial discharge voltage when the initial discharge voltage is greater than the discharge voltage threshold, and boost the initial discharge voltage when the initial discharge voltage is less than the discharge voltage threshold, to achieve a constant output voltage. If the voltage regulating module 1022 is a boost bypass circuit, the voltage regulating module 1022 may boost the initial discharge voltage when the initial discharge voltage is less than the discharge voltage threshold, and directly output the initial discharge voltage as the target discharge voltage when the initial discharge voltage is greater than the discharge voltage threshold. In comparison, the cost of the buck-boost circuit is higher than that of the boost bypass circuit.

[0053] In one embodiment, the battery module 104 includes a ternary polymer lithium battery cell.

[0054] It can be understood that by setting the control module 1021 to generate and send a control instruction to the voltage regulating module 1022 according to the size relationship between the initial discharge voltage and the discharge voltage threshold, and then the voltage regulating module 1022 operates in the target working mode under the control of the control module 1021, the boost processing mode, the buck processing mode and the direct-through processing mode of the discharge branch 102 can be further realized.

[0055] In one embodiment, if Figure 3 As shown, the battery module 104 includes a battery 1052 and a battery management unit 1051, and the battery management unit 1051 is connected to the battery 1052, the charging branch 103 and the discharging branch 102 respectively, wherein:

[0056] The battery management unit 1051 is used to transmit a target charging voltage to the battery module 104 according to the current voltage of the battery module 104 , or to transmit an initial discharge voltage to the discharge branch 102 , or to transmit a target charging voltage to the discharge branch 102 .

[0057] During the implementation process, the battery management unit 1051 forms multiple paths between the battery 1052, the charging branch 103 and the discharging branch 102, and then manages the path between the battery 1052 and the charging branch 103, the path between the charging branch 103 and the discharging branch 102, and the path between the battery 1052 and the discharging branch 102, so as to transmit the target charging voltage to the battery module 104, or transmit the initial discharging voltage to the discharging branch 102, or transmit the target charging voltage to the discharging branch 102.

[0058] It should be noted that the above-mentioned battery management unit 1051 can be a charging management chip in the related technology, and the charging management chip manages the current transmission path of the battery 1052 through dynamic power path management.

[0059] It can be understood that by providing the battery management unit 1051 between the battery, the charging branch 103 and the discharging branch 102 , the passage between the battery, the charging branch 103 and the discharging branch 102 can be further managed.

[0060] In one embodiment, if Figure 4 As shown, the battery module 104 further includes a switch unit 1053, and the switch unit 1053 is connected to the battery management unit 1051 and the battery 1052 respectively, wherein:

[0061] The switch unit 1053 is used to determine whether to conduct the connection between the battery management unit 1051 and the battery 1052 according to the current current of the load 101 and a preset first threshold value;

[0062] In which, when the current current of the load 101 is greater than or equal to the first threshold, the switch unit 1053 disconnects the connection between the battery management unit 1051 and the battery 1052 to use the target charging voltage as the initial discharge voltage; when the current current of the load 101 is less than the first threshold, the switch unit 1053 turns on the connection between the battery management unit 1051 and the battery 1052 to use the output voltage of the battery 1052 as the initial discharge voltage.

[0063] During the implementation process, when the current current of the load 101 is greater than or equal to the first threshold value, the switch unit 1053 disconnects the connection between the battery management unit 1051 and the battery 1052, and the charging branch 103 is connected to the discharge branch 102 through the battery management unit 1051, so as to use the target charging voltage as the initial discharge voltage; when the current current of the load 101 is less than the first threshold value, the switch unit 1053 turns on the connection between the battery management unit 1051 and the battery 1052, and the battery 1052 is connected to the discharge branch 102 through the battery management unit 1051, so as to use the output voltage of the battery 1052 as the initial discharge voltage.

[0064] Optionally, the above-mentioned switching unit 1053 may include a switch, a current detector and a processor, the current detector is used to detect the current current size of the load 101, the processor is used to generate and send a control signal to the switch according to the relationship between the current current size and the size of the first threshold, and the switch is used to receive and respond to the control signal to turn on or off the connection between the battery management unit 1051 and the battery 1052.

[0065] In one embodiment, the switch unit 1053 includes a field effect transistor.

[0066] It can be understood that by setting the switch unit 1053, when the current requirement of the load 101 is high, regardless of the battery voltage, the target charging voltage output by the charging device 20 can be directly output to the discharge branch 102 as the initial discharge voltage to complete the power supply to the load 101 based on the target charging voltage.

[0067] In one embodiment, the switch unit 1053 is also used to turn on the connection between the battery management unit 1051 and the battery when the current current of the load 101 is greater than a second threshold value, so as to use the sum of part and all of the output voltage of the battery 1052 and the target charging voltage as the initial discharge voltage, and the second threshold value is greater than the first threshold value.

[0068] During the implementation process, when the current current of the load 101 is greater than the second threshold, the switch unit 1053 is turned on, and the battery management unit 1051 uses the sum of the battery's output voltage and the target charging voltage as the initial discharge voltage to meet the power supply demand of the load 101 when the current current of the load 101 is greater than the second threshold.

[0069] Optionally, the battery management unit 1051 may superimpose part of the output voltage of the battery with the target charging voltage and output it to the discharge branch 102, or may superimpose the entire output voltage of the battery 1052 with the target charging voltage and output it to the discharge branch 102. The specific setting is made by technical personnel in this field according to actual conditions and is not limited in this application.

[0070] It can be understood that when the current current of the load 101 is greater than the second threshold value, the switch unit 1053 is set to turn on the connection between the battery management unit 1051 and the battery, so that the sum of the output voltage of the battery 1052 and the target charging voltage is used as the initial discharge voltage. When the current requirement of the load 101 is further increased, the output voltage of the battery 1052 and the target charging voltage output by the charging branch 103 can be used as the initial discharge voltage at the same time.

[0071] In one embodiment, the switch unit 1053 is also used to conduct the connection between the battery management unit 1051 and the battery 1052 when not connected to the charging device 20, so as to supply power to the load 101 through the battery 1052.

[0072] During the implementation process, if the charging device 20 is not connected to the charging branch 103, since there is no target charging current output to the battery management unit 1051, the battery management unit 1051 cannot supply power to the battery module 104 or the load 101 according to the target charging current. Therefore, the switch unit 1053 will always be in the on state regardless of the battery voltage. At this time, if the battery voltage is lower than the discharge voltage threshold, the electronic device will be powered off due to insufficient power.

[0073] It can be understood that, by setting the switch unit 1053 to conduct the connection between the battery management unit 1051 and the battery 1052 when not connected to the charging device 20 , the load 101 is powered by the battery 1052 .

[0074] An embodiment of the present application also provides an electronic device, which may include the charging and discharging circuit in any of the above embodiments.

[0075] It should be understood that "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in one embodiment" or "in some embodiments" appearing throughout the specification may not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The above-mentioned sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above description of each embodiment tends to emphasize the differences between the various embodiments, and the same or similar aspects can be referenced to each other. For the sake of brevity, this article will not repeat them.

[0076] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0077] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0078] The modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules; they may be located in one place or distributed on multiple network units; some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0079] In addition, all functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may be a separate unit, or two or more modules may be integrated into one unit; the above-mentioned integrated modules may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0080] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, the storage medium including a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0081] The features disclosed in several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0082] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A charging and discharging circuit, characterized in that: The circuit comprises a battery module, a charging branch and a discharging branch, wherein the charging branch is connected to the battery module, and the discharging branch is connected to a load and the battery module respectively, wherein: The battery module is used to store or release electricity; The charging branch is used to convert the initial charging voltage output by the charging device into a target charging voltage when connected to the charging device, and transmit the target charging voltage to the battery module; The discharge branch is used to determine a target processing method according to the relationship between the initial discharge voltage output by the battery module and the discharge voltage threshold, and convert the initial discharge voltage into a target discharge voltage through the target processing method and output it to the load. The target processing method includes a boost processing method, a buck processing method or a direct-through processing method.

2. The charge and discharge circuit according to claim 1, characterized in that: The discharge branch includes a control module and a voltage regulating module, and the control module is connected to the voltage regulating module, wherein: The control module is used to generate and send a control instruction to the voltage regulating module according to the magnitude relationship between the initial discharge voltage and the discharge voltage threshold, so as to control the voltage regulating module to operate in a target operating mode; The voltage regulating module is used to operate in the target operating mode under the control of the control module, and the target operating mode includes a boost mode for boosting the initial discharge voltage to a target range corresponding to the discharge voltage threshold, a pass-through mode for outputting the initial discharge voltage, or a step-down mode for stepping down the initial discharge voltage to a target range corresponding to the discharge voltage threshold.

3. The charge and discharge circuit according to claim 1, characterized in that: The battery module includes a battery and a battery management unit, and the battery management unit is connected to the battery, the charging branch and the discharging branch respectively, wherein: The battery management unit is used to transmit the target charging voltage to the battery module according to the current voltage of the battery module, or transmit the initial discharge voltage to the discharge branch, or transmit the target charging voltage to the discharge branch.

4. The charge and discharge circuit according to claim 3, characterized in that: The battery module further includes a switch unit, which is connected to the battery management unit and the battery respectively, wherein: The switch unit is used to determine whether to conduct the connection between the battery management unit and the battery according to the current current of the load and a preset first threshold; Wherein, when the current current of the load is greater than or equal to a first threshold value, the switch unit disconnects the connection between the battery management unit and the battery to use the target charging voltage as the initial discharge voltage; when the current current of the load is less than the first threshold value, the switch unit turns on the connection between the battery management unit and the battery to use the output voltage of the battery as the initial discharge voltage.

5. The charge and discharge circuit according to claim 4, characterized in that: The switching unit is also used to turn on the connection between the battery management unit and the battery when the current current of the load is greater than a second threshold value, so as to use part or all of the output voltage of the battery and the target charging voltage as the initial discharge voltage, and the second threshold value is greater than the first threshold value.

6. The charge and discharge circuit according to claim 4, characterized in that: The switch unit is also used to conduct the connection between the battery management unit and the battery when not connected to the charging device, so as to supply power to the load through the battery.

7. The charge and discharge circuit according to claim 4, characterized in that: The switch unit includes a field effect transistor.

8. The charge and discharge circuit according to claim 2, characterized in that: The voltage regulation module includes a buck-boost circuit or a boost bypass circuit.

9. The charge and discharge circuit according to claim 2, characterized in that: The battery module includes a ternary polymer lithium battery cell.

10. An electronic device, characterized in that: The electronic device comprises the charging and discharging circuit as described in any one of claims 1-9.

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