Charging device

Abstract

The utility model provides a charging device. The charging device comprises a main body; a charging circuit provided in the main body; the at least one first interface is arranged on the main body and is electrically connected with the charging circuit, and the first interface is used for connecting a first energy storage device; the plurality of second interfaces are arranged on the main body and electrically connected with the charging circuit, and the second interfaces are used for being connected with a second energy storage device; wherein the charging circuit is used for obtaining direct current from the first energy storage device through the first interface; the charging circuit is also used for converting alternating current obtained from the external alternating current power supply into direct current and transmitting the direct current to the second energy storage device through the second interface; the at least one third interface is arranged on the main body, is electrically connected with the charging circuit and is used for being connected with an electric device; and the charging circuit is also used for converting the direct current into alternating current and transmitting the alternating current to the electric device through the third interface. And under the condition of no external power supply, direct current and alternating current can be provided, so that the diversity of functions is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a charging device. BACKGROUND

[0002] The electrical appliances in daily life usually include electrical appliances using direct current, electrical appliances using alternating current, and electrical appliances using alternating current and direct current. Among them, the electrical appliances using direct current and the electrical appliances using alternating current and direct current are usually equipped with a battery pack for storing direct current. In order to charge the battery pack, a charger appears, which can obtain alternating current from an alternating current power supply and convert it into direct current to charge the battery pack.

[0003] The current charger supports multiple charging ports and can be used to charge multiple battery packs. However, in the case of no alternating current power supply, such as outdoors, the charger cannot charge the battery pack. Therefore, some chargers use high-power battery packs as backup power to charge the battery pack of the electrical appliance in the absence of power supply.

[0004] However, the charger in the related art is only used to charge the battery pack of the electrical appliance using direct current, and the function is relatively single. In the outdoors, some electrical appliances that need to use alternating current cannot be used normally. CONTENT OF THE INVENTION

[0005] In view of the above, it is necessary to provide a charging device that can provide direct current and alternating current in the absence of an external power supply, which can improve the diversity of functions.

[0006] The present application provides a charging device, comprising: a main body; a charging circuit arranged in the main body; at least one first interface arranged in the main body and electrically connected with the charging circuit, the first interface being used to connect a first energy storage device; a plurality of second interfaces arranged in the main body and electrically connected with the charging circuit, the second interface being used to connect a second energy storage device; wherein the charging circuit is used to obtain direct current from the first energy storage device through the first interface; the charging circuit is also used to convert alternating current obtained from an external alternating current power supply into direct current and deliver the direct current to the second energy storage device through the second interface; at least one third interface arranged in the main body and electrically connected with the charging circuit, used to connect an electrical device; the charging circuit is also used to convert the direct current into alternating current and deliver it to the electrical device through the third interface.

[0007] In some embodiments, the charging device further comprises: at least one fourth interface arranged in the main body and electrically connected with the charging circuit, used to connect an external direct current power supply; the charging circuit is also used to obtain direct current from the external direct current power supply through the fourth interface.

[0008] In some embodiments, the charging circuit comprises an AC input unit, a rectification unit and a charging unit, the AC input unit is electrically connected with the rectification unit, the rectification unit is electrically connected with the charging unit, the AC input unit is configured to obtain AC power from an external AC power source, the rectification unit is configured to convert the AC power into DC power and deliver the DC power to the charging unit, the charging unit is electrically connected with the second interface, and the charging unit is configured to deliver the DC power to the second energy storage device through the second interface.

[0009] In some embodiments, the charging circuit further comprises a DC input unit, the DC input unit is electrically connected with the charging unit, the first interface and the fourth interface, the DC input unit is configured to obtain DC power from the first energy storage device through the first interface and deliver the DC power to the charging unit, and the DC input unit is further configured to obtain DC power from an external DC power source through the fourth interface and deliver the DC power to the charging unit.

[0010] In some embodiments, the charging circuit further comprises an inversion unit, the inversion unit is electrically connected with the rectification unit, the DC input unit and the third interface, and the inversion unit is configured to convert the DC power obtained from the rectification unit or the DC input unit into AC power and deliver the AC power to the electrical device through the third interface.

[0011] In some embodiments, the charging circuit further comprises a control unit and a wireless communication unit, the wireless communication unit is electrically connected with the control unit and configured to receive a control instruction from an external terminal, and the control unit is electrically connected with the charging unit, the DC input unit and the inversion unit and configured to control the working states of the charging unit, the DC input unit and the inversion unit based on the control instruction.

[0012] In some embodiments, the control unit is further configured to obtain state information of the first energy storage device and the second energy storage device and send the state information to the external terminal through the wireless communication unit.

[0013] In some embodiments, the charging device further comprises a plurality of switches, the switches are arranged outside the main body and electrically connected with the charging circuit, and the switches are configured to control the working states of the first interface, the second interface, the third interface or the fourth interface.

[0014] In some embodiments, the charging device further comprises a plurality of indicators, the indicators are arranged outside the main body and electrically connected with the charging circuit, and the indicators are configured to indicate the working states of the first interface, the second interface, the third interface or the fourth interface.

[0015] In some embodiments, the fourth interface is configured as a female terminal, and the charging device further comprises a fitting, the fitting has a male terminal matched with the female terminal, and the fitting is configured to electrically connect the external DC power source with the fourth interface.

[0016] Compared with the prior art, the present application has at least the following advantages:

[0017] 1、In the application, when there is a power supply indoors, the charging circuit of the charging device can obtain electrical energy from the external AC power supply and convert it into DC power stored in the second energy storage device. When there is no power supply outdoors, the charging circuit of the charging device can obtain electrical energy from the first energy storage device and store it in the second energy storage device. Thus, the second energy storage device can be continuously charged, and the electrical device can use the DC power in the second energy storage device to work.

[0018] 2、In the application, when there is no power supply outdoors, the charging circuit of the charging device can obtain electrical energy from the first energy storage device and convert it into AC power before providing it to the electrical device. Thus, the electrical device can use AC power to work, and the functionality of the charging device is more diverse. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the charging device of the embodiment of the application.

[0020] Figure 2 is a schematic diagram of the application scenario of the charging device of the embodiment of the application.

[0021] Figure 3 is a structural schematic diagram of one embodiment of the accessory in the charging device of the embodiment of the application.

[0022] Figure 4 is a structural schematic diagram of one embodiment of the accessory in the charging device of the embodiment of the application.

[0023] Figure 5 is a circuit schematic diagram of one embodiment of the charging circuit in the charging device of the embodiment of the application.

[0024] Figure 6 is a circuit schematic diagram of another embodiment of the charging circuit in the charging device of the embodiment of the application.

[0025] MAIN ELEMENT SYMBOL EXPLANATION:

[0026] 1, charging device; 2, first energy storage device; 3, second energy storage device; 4, external AC power supply; 5, external DC power supply; 6, electrical device; 11, main body; 110, interface assembly; 111, first interface; 112, second interface; 113, third interface; 114, fourth interface; 115a, first switch; 115b, second switch; 116a, first indicator; 116b, second indicator; 117, power cord; 118, handle; 12, charging circuit; 121, AC input unit; 122, rectifier unit; 123, charging unit; 124, DC input unit; 125, inverter unit; 126, control unit; 127, wireless communication unit; 1141, first accessory; 1142, second accessory.

[0027] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] In the description of the embodiments of the present application, the words "exemplary", "or", "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "for example" in the present application is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the words "exemplary", "or", "for example" is intended to present concepts in a concrete manner. In the description of the embodiments of the present application, the term "include" or "comprise" or "have" is used to indicate that there can be additional items in the description of the embodiments of the present application. In the description of the embodiments of the present application, the term "or" is used to indicate a non-exclusive relationship, for example, "A or B" means "A or B or both".

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for describing the particular embodiments only and is not intended to be limiting of the application. "At least one" means one or more. "Multiple" means two or more. In addition, it is to be understood that the terminology used in the description and the claims herein, as well as in the appended drawings, is intended to be interpreted in only an illustrative and not in a limiting sense.

[0030] The electrical appliances in daily life usually include electrical appliances using direct current, electrical appliances using alternating current, and electrical appliances using alternating current and direct current, such as commonly used power tools, which mostly work with direct current. Among them, electrical appliances using direct current and electrical appliances using alternating current and direct current, such as power tools, personal devices (mobile phones, notebook computers), etc., are usually equipped with a battery pack for storing direct current. In order to charge the battery pack, a charger appears, which can obtain alternating current from an alternating current power source and convert it into direct current to charge the battery pack.

[0031] The current charger supports multiple charging and can be used to charge multiple battery packs. However, in the case of no alternating current power source, such as outdoors, the charger cannot charge the battery pack. Therefore, some chargers use a high-power battery pack as a backup power source to charge the battery pack of the electrical appliance in the case of no power source, such as setting a high-power battery pack in the charger, or the charger can plug in a high-power battery pack, and release the direct current in the high-power battery pack to charge other battery packs.

[0032] However, the charger in the related art is only used to charge the battery pack of the electrical appliance using direct current, and the function is relatively single. In the outdoors, some electrical appliances that need to use alternating current cannot be used normally, such as mini-fridges, ovens, or notebook computers, etc., which need to be connected to alternating current to be used.

[0033] To this end, the application provides a charging device which can provide direct current and alternating current without external power supply, and can improve the diversity of functions. Some embodiments will be described below with reference to the accompanying drawings. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0034] In combination Figures 1 to 6 As shown in the drawings, the charging device 1 can include a main body 11 and a charging circuit 12. As Figure 1 As shown in the drawings, the main body 11 can be provided with an interface assembly 110 for plugging the energy storage device, and the interface assembly 110 is electrically connected with the charging circuit 12. The main body 11 can be a rectangular body, the side of the main body 11 can be used to set the interface assembly 110, the lower bottom can be used to place stably, and the upper bottom can be provided with a handle 118 to facilitate the user to hold the charging device 1. The handle 118 can be set as hidden, and the main body 11 is provided with a groove corresponding to the position of the handle 118, and the handle 118 can be stored in the groove outside the main body 11 when not in use, thereby reducing the space occupation.

[0035] In some embodiments, each outer surface of the main body 11 can be used to set the interface assembly 100.

[0036] In some embodiments, the main body 11 is provided with a plurality of protrusions corresponding to the positions of the interface assembly 110, and the protrusions can be adapted to the shape of the energy storage device, thereby playing the role of clamping and stabilizing when the interface assembly 110 plugs the energy storage device.

[0037] As Figure 1 As shown in the drawings, the interface assembly 110 can include a first interface 111, which is set on one side of the main body 11 and is electrically connected with the charging circuit 12. The first interface 111 is used to connect the first energy storage device 2. The number of the first interface 111 is at least one, and the type is adapted to the first energy storage device 2. The first energy storage device 2 can be a high-power battery pack, and when there is no power supply outdoors, the first energy storage device 2 can input direct current to the charging device 1 through the first interface 111, so that the charging device 1 obtains direct current.

[0038] As Figure 1As shown, the interface assembly 110 can further include a second interface 112 disposed on a side of the main body 11, and the second interface 112 is electrically connected with the charging circuit 12. The second interface 112 is used to connect the second energy storage device 3. The number of the second interface 112 can be multiple, and the type of the second interface 112 is adapted to the second energy storage device 3. The multiple second interfaces 112 can be distributed on multiple sides of the main body 11. The number of the second interface 112 can be an even number, for example, 2, 4, 6, or 8, etc. The even number of the second interface 112 can be distributed side by side on multiple sides of the main body 11, for example, one side of the main body 11 can be distributed with 4 second interfaces 112 side by side, and the opposite side can be distributed with another 4 second interfaces 112 side by side. The second energy storage device 3 can be a battery pack in the electric device 6. When there is no power supply outdoors, the charging circuit 12 obtains direct current from the first energy storage device 2 through the first interface 111 and inputs the direct current into the second energy storage device 3 through the second interface 112. When there is a power supply outdoors, the charging circuit 12 obtains alternating current from the external alternating current power supply 4 and converts the alternating current into direct current, and then inputs the direct current into the second energy storage device 3 through the second interface 112, thereby realizing continuous charging of the second energy storage device 3 outdoors and indoors.

[0039] In some other embodiments, the first energy storage device 2 and the second energy storage device 3 can be battery packs of the same power, that is, the first energy storage device 2 and the second energy storage device 3 can be the same.

[0040] In the embodiments of the present application, the first interface 111 is used to connect the first energy storage device 2, and the charging circuit 12 can obtain direct current from the first energy storage device 2 through the first interface 111, so the first interface 111 is also called a discharge port. The second interface 112 is used to connect the second energy storage device 3, and the charging circuit 12 charges the second energy storage device 3 through the second interface 112, so the second interface 112 is also called a charging port. In other words, the discharge port is used to release the electric energy in the first energy storage device 2, and the charging port is used to charge the second energy storage device, and the two are independent of each other, which can reduce the problem of high internal charging circuit 12 complexity caused by using one interface for discharging and charging, that is, the charging circuit 12 can be simplified, and the cost can be reduced.

[0041] As Figure 2As shown, the interface assembly 110 can further include a third interface 113 disposed on one side of the main body 11, and the third interface 113 is electrically connected with the charging circuit 12. The third interface 113 is used to connect the electric device 6. The number of the third interface 113 is at least one, and the type can be set as the style of a socket. The electric device 6 can be an electric device 6 using alternating current. In the case of no power supply in the open air, the charging circuit 12 can convert direct current into alternating current and deliver it to the electric device 6 through the third interface 113, so that the charging device 1 can provide both direct current and alternating current, improve the diversity of functions, and have a wider range of applications.

[0042] As shown, Figure 1 the interface assembly 110 can further include a fourth interface 114 disposed on one side of the main body 11, and the fourth interface 114 is electrically connected with the charging circuit 12. The fourth interface 114 is used to connect the external direct current power supply 5. The number of the fourth interface 114 is at least one. The external direct current power supply 5 can be a car cigarette lighter or a battery, etc. The charging circuit 12 obtains direct current from the external direct current power supply 5 through the fourth interface 114, and can use the direct current to charge the second energy storage device 3.

[0043] In some embodiments, the fourth interface 114 can be set as a female end, and the charging device 1 further includes a fitting having a male end matched with the female end, and the fitting is used to electrically connect the external direct current power supply 5 with the fourth interface 114. For example, as shown, Figure 3 when the external direct current power supply 5 is a battery, the fitting can be a second fitting 1142, the male end of the second fitting 1142 is plugged into the fourth interface 114, and the other end is adaptively connected with the positive and negative poles of the battery, or as shown, Figure 4 when the external direct current power supply 5 is a car cigarette lighter, the fitting can be a first fitting 1141, the male end of the first fitting 1141 is plugged into the fourth interface 114, and the other end is adaptively connected with the car cigarette lighter.

[0044] In some embodiments, the fourth interface 114 can be set as a female end, and the fourth interface 114 can be disposed on the same side of the main body 11 as the first interface 111, for example, one side of the main body 11 forms a recess, and the first interface 111 and the second interface 112 can be disposed in the recess. In this way, the space can be saved.

[0045] In some embodiments, the charging device 1 can further include a switch. Corresponding to the number of interfaces, the switch can be multiple. The switch is disposed outside the main body 11 and is electrically connected with the charging circuit 12, and the switch can be used to control the working state of the first interface 111, the second interface 112, the third interface 113 or the fourth interface 114. For example, as shown, Figure 1As shown, the switch can include a first switch 115a, which is used to control the working state of the first interface 111. When the electric energy needs to be obtained from the first energy storage device 2, the first switch 115a can be closed to electrically connect the first energy storage device 2 into the charging circuit 12, so that the charging circuit 12 can obtain the direct current from the first energy storage device 2; or, as shown, when the electric device 6 using the alternating current is plugged into the third interface 113, the second switch 115b can be closed to electrically connect the electric device 6 with the charging circuit 12, so that the electric device 6 can obtain the alternating current from the charging circuit 12. Figure 2 As shown, the switch can include a second switch 115b, which is used to control the working state of the third interface 113. When the electric device 6 using the alternating current is plugged into the third interface 113, the second switch 115b can be closed to electrically connect the electric device 6 with the charging circuit 12, so that the electric device 6 can obtain the alternating current from the charging circuit 12.

[0046] In some embodiments, the closing of the switch can be manually controlled or controlled by the charging circuit 12.

[0047] In some embodiments, the charging device 1 can further include an indicator. The indicator can be multiple corresponding to the number of interfaces. The indicator is arranged outside the main body 11 and electrically connected with the charging circuit 12. The indicator can be used to indicate the working state of the first interface 111, the second interface 112, the third interface 113 or the fourth interface 114. For example, as shown, when the first interface 111 is working, the corresponding first indicator 116a can be a light or a light color conversion, such as from red when not working to green when working, or as shown, when the second interface 112 is working, the corresponding second indicator 116b can be a light or a light color conversion. Figure 1 Figure 2 As shown, when the second interface 112 is working, the corresponding second indicator 116b can be a light or a light color conversion. Thus, the user can determine whether the interface can be used normally.

[0048] As shown, in some embodiments, the charging device 1 can further include a power cord 117, which can be used to connect an external alternating current power source 4. Figure 1

[0049] In some embodiments, the charging device 1 can further include a protective cover. The protective cover can be multiple corresponding to the number of interfaces. The protective cover is arranged in the main body 11 and corresponds to the position of each interface. The protective cover can be rotated and can be used to protect the interface. Thus, the interface can be reduced to be damaged by dust, water and other erosion.

[0050] As described above, please refer to Figure 5 The charging device 1 of the embodiments of the present application further includes a charging circuit 12. The charging circuit 12 is arranged in the main body 11.

[0051] ​​In the embodiment, the charging circuit 12 can include an AC input unit 121, a rectifier unit 122 and a charging unit 123. The AC input unit 121 is electrically connected with the rectifier unit 122, and the rectifier unit 122 is electrically connected with the charging unit 123. The AC input unit 121 is configured to obtain AC power from the external AC power source 4. The rectifier unit 122 is configured to convert the AC power into DC power and deliver the DC power to the charging unit 123. The charging unit 123 is electrically connected with the second interface 112, and the charging unit 123 is configured to deliver the DC power to the second energy storage device 3 through the second interface 112. In the case that there is an AC power source indoors, the charging device 1 can charge the second energy storage device 3 through the AC input unit 121, the rectifier unit 122 and the charging unit 123.

[0052] In some embodiments, the AC input unit 121 can include a transformer. When the external AC power source 4 is connected, the voltage of the external AC power source 4 can be converted into the input voltage of the charging circuit 12 through the transformer.

[0053] In some embodiments, the rectifier unit 122 can have the functions of filtering, rectifying and power conversion.

[0054] In the embodiment, the charging circuit 12 can further include a DC input unit 124. The DC input unit 124 is electrically connected with the charging unit 123, the first interface 111 and the fourth interface 114. The DC input unit 124 is configured to obtain DC power from the first energy storage device 2 through the first interface 111 and deliver the DC power to the charging unit 123. The DC input unit 124 is also configured to obtain DC power from the external DC power source 5 through the fourth interface 114 and deliver the DC power to the charging unit 123. In the case that there is no AC power outdoors, the charging device 1 can obtain DC power from the external DC power source 5, such as a car cigarette lighter or a battery, through the DC input unit 124 and the fourth interface 114, and continuously charge the second energy storage device 3.

[0055] In some embodiments, the DC input unit 124 can have the function of power conversion. The DC input unit 124 can convert the current of the external DC power source 5 into the input current of the charging circuit 12.

[0056] In the embodiment, the charging circuit 12 can further include an inverter unit 125. The inverter unit 125 is electrically connected with the rectifier unit 122, the DC input unit 124 and the third interface 113. The inverter unit 125 is configured to convert the DC power obtained from the rectifier unit 122 or the DC input unit 124 into AC power and deliver the AC power to the electrical device 6 through the third interface 113. In the case that there is no AC power source outdoors, the charging device 1 can also supply power to the electrical device 6 using AC power, thereby improving the diversity and applicability of the functions of the charging device 1.

[0057] Referring to Figure 6 In some embodiments, the charging circuit 12 can further include a control unit 126 and a wireless communication unit 127.

[0058] The wireless communication unit 127 is electrically connected with the control unit 126, and the wireless communication unit 127 is configured to receive control instructions from an external terminal. The external terminal can be a mobile phone, a desktop computer, a notebook computer, or the like. The external terminal can have an application program for monitoring and controlling the working state of the charging device 1.

[0059] The charging unit 123, the DC input unit 124, and the inverter unit 125 are electrically connected with the control unit 126, and the control unit 126 is configured to control the working state of the charging unit 123, the DC input unit 124, and the inverter unit 125 based on the control instructions. For example, after the external terminal is connected with the control unit 126 through the wireless communication unit 127, the first energy storage device 2 connected with the first interface 111 can be discharged, the second energy storage device 3 connected with the second interface 112 can be charged, the power device 6 connected with the third interface 113 can be powered, and the external DC power supply 5 connected with the fourth interface 114 can be used to obtain electric energy.

[0060] In some embodiments, the control unit 126 is electrically connected with a switch. The opening and closing of the first interface 111, the second interface 112, the third interface 113, and the fourth interface 114 can be controlled by controlling the switch, so as to remotely control the discharge of the first energy storage device 2 connected with the first interface 111, the charging of the second energy storage device 3 connected with the second interface 112, the powering of the power device 6 connected with the third interface 113, or the use of the external DC power supply 5 connected with the fourth interface 114 to obtain electric energy.

[0061] In some embodiments, the external terminal can remotely control the charging sequence of a plurality of second energy storage devices 3, i.e., the charging priority can be set.

[0062] In some embodiments, the external terminal can also perform power distribution according to requirements. For example, the total power of the first energy storage device 2 is 800W, a part of the power of the first energy storage device 2, such as 200W, can be used to charge the second energy storage device 3 through the charging unit 123 and the second interface 112, and another part of the power, such as 600W, can be used to power the power device 6 through the DC input unit 124, the inverter unit 125, and the third interface 113.

[0063] In some embodiments, the control unit 126 can also be configured to acquire state information of the first energy storage device 2 and the second energy storage device 3, and send the state information to an external terminal through the wireless communication unit 127. The state information of the first energy storage device 2 and the second energy storage device 3 can include power, working state, etc.

[0064] In summary, in the present application, when there is a power supply indoors, the charging circuit 12 of the charging device 1 can obtain power from the external AC power supply 4, convert it into DC power, and store it in the second energy storage device 3. When there is no power supply outdoors, the charging circuit 12 of the charging device 1 can obtain power from the first energy storage device 2 and store it in the second energy storage device 3. Thus, the second energy storage device 3 can be continuously charged, and in turn, the electrical device 6 can use the DC power in the second energy storage device 3 to work. In addition, when there is no power supply outdoors, the charging circuit 12 of the charging device 1 can obtain power from the first energy storage device 2, convert it into AC power, and then provide it to the electrical device 6. Thus, the electrical device 6 can use AC power to work, and the diversity of the functions of the charging device 1 is improved.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A charging device, characterized in that, include: main body; A charging circuit is disposed in the main body; At least one first interface is disposed on the main body and electrically connected to the charging circuit, the first interface being used to connect a first energy storage device; the first interface is located on a first side of the main body; Multiple second interfaces are disposed on the main body and electrically connected to the charging circuit. The second interfaces are used to connect to a second energy storage device. The multiple second interfaces are located on a second side of the main body, and the second side intersects with the first side. The charging circuit is used to obtain DC power from the first energy storage device through the first interface; the charging circuit is also used to convert AC power obtained from an external AC power source into DC power and deliver the DC power to the second energy storage device through the second interface. At least one third interface is provided on the main body and electrically connected to the charging circuit for connecting an electrical device; The charging circuit is also used to convert direct current into alternating current and deliver it to the power-consuming device through the third interface.

2. The charging device according to claim 1, characterized in that, Also includes: At least one fourth interface is provided on the main body and electrically connected to the charging circuit for connecting to an external DC power supply; The charging circuit is also used to obtain DC power from the external DC power source through the fourth interface.

3. The charging device according to claim 2, characterized in that, The charging circuit includes an AC input unit, a rectifier unit, and a charging unit. The AC input unit is electrically connected to the rectifier unit, and the rectifier unit is electrically connected to the charging unit. The AC input unit is used to obtain AC power from the external AC power source. The rectifier unit is used to convert the AC power into DC power and deliver it to the charging unit. The charging unit is electrically connected to the second interface and is used to deliver DC power to the second energy storage device through the second interface.

4. The charging device according to claim 3, characterized in that, The charging circuit further includes a DC input unit, which is electrically connected to the charging unit, the first interface, and the fourth interface. The DC input unit is used to obtain DC power from the first energy storage device through the first interface and supply it to the charging unit. The DC input unit is also used to obtain DC power from the external DC power source through the fourth interface and supply it to the charging unit.

5. The charging device according to claim 4, characterized in that, The charging circuit also includes an inverter unit, which is electrically connected to the rectifier unit, the DC input unit, and the third interface. The inverter unit is used to convert DC power obtained from the rectifier unit or the DC input unit into AC power and deliver it to the power-consuming device through the third interface.

6. The charging device according to claim 5, characterized in that, The charging circuit also includes a control unit and a wireless communication unit; The wireless communication unit is electrically connected to the control unit and is used to receive control commands from an external terminal. The control unit is electrically connected to the charging unit, the DC input unit, and the inverter unit, and is used to control the electrical operating state of the charging unit, the DC input unit, and the inverter unit based on the control commands.

7. The charging device according to claim 6, characterized in that, The control unit is also used to acquire the status information of the first energy storage device and the second energy storage device, and send the status information to the external terminal through the wireless communication unit.

8. The charging device according to claim 2, characterized in that, The charging device also includes multiple switches, which are located outside the main body and electrically connected to the charging circuit, and are used to control the working status of the first interface, the second interface, the third interface or the fourth interface.

9. The charging device according to claim 2, characterized in that, The charging device also includes multiple indicators, which are disposed outside the main body and electrically connected to the charging circuit, for indicating the working status of the first interface, the second interface, the third interface or the fourth interface.

10. The charging device according to claim 2, characterized in that, The fourth interface is configured as a female terminal, and the charging device further includes an accessory having a male terminal that matches the female terminal. The accessory is used to electrically connect the external DC power supply to the fourth interface.

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