Charging device and charging system

Abstract

The present invention provides a charging device configured to be operably mechanically and electrically connectable with a plurality of battery packs to transmit power to the battery packs or allow the battery packs to transmit power to the charging device, the charging device comprises a first battery pack joint part which is mechanically and electrically connected with the first battery pack and is arranged on the first surface; a second battery pack joint part which is mechanically and electrically connected with the second battery pack and is arranged on the second surface; and the output port is arranged on the third surface and is used for transmitting power to external equipment. Wherein the charging device controls the charging and discharging operation of the battery pack / external equipment connected to the charging device according to a preset mode under the condition that the charging device is connected to a power grid or is not connected to the power grid. The invention further provides a charging system with the charging device. According to the charging device, a user can conveniently select different charging and discharging modes according to needs, multifunctional charging and discharging operation is achieved, and the charging device is convenient to carry.

Description

Technical Field

[0001] The present invention relates to a charging device and a charging system having the charging device. The charging device can supply power to a battery pack for a power tool or receive power from the battery pack, and can also supply power to an external device such as an electronic device. Background Art

[0002] In the case where there is no fixed power supply or it is not convenient to directly supply power, a detachable battery pack is usually attached to a power-consuming device that needs to be frequently moved, such as a power tool, for power supply. After the battery pack runs out of power, it is connected to a charging device for charging.

[0003] Generally, a charging device for a battery pack is only provided with a single number of charging interfaces / ports, and it can only charge one battery pack at a time. After one battery pack is charged, the user needs to manually disconnect the battery pack from the charging device and replace it with another battery pack to be charged for the charging operation. This results in inconvenient charging operations and wasted time when there are multiple battery packs to be charged. The user needs to pay attention to the charging completion of the battery pack being charged to replace the battery pack in a timely manner, and cannot connect multiple battery packs to the charging device at the same time and have the charging device control the charging operations of the multiple battery packs.

[0004] In addition, since the current charging device only provides a specific type of charging interface / port, correspondingly, the battery pack must be configured with this specific type of interface to be electrically connected to the charging device for charging operations. This results in poor compatibility of the charging device and inability to cooperate with multiple battery packs having different electrical connection ports.

[0005] Furthermore, most of the current charging devices are single-functional, that is, they can only provide a one-way charging operation for the battery pack of a power tool, and cannot obtain power from the connected battery pack, nor can they supply power to other types of power-consuming devices, such as electronic devices like digital products. This results in a single function, low integration degree, and fewer available scenarios of the charging device.

[0006] Therefore, it is desirable to provide an improved charging device and a charging system having the charging device to have multifunctionality, convenience, efficiency, compactness, etc. Summary of the Invention

[0007] The object of the present invention is to provide a compact multifunctional charging device and system, allowing a user to achieve charging and discharging operations on multiple different types or specifications of power-consuming devices through only one portable charging device, and also to achieve different charging and discharging modes to adapt to a variety of different application scenarios.

[0008] To achieve at least the above object, according to one aspect of the present invention, there is provided a charging device configured to be operably mechanically and electrically connected to a plurality of battery packs on different sides thereof to transmit power to the battery packs or allow the battery packs to transmit power to the charging device. The charging device is characterized in that it includes: a first battery pack engaging portion for mechanically and electrically connecting to a first battery pack, wherein the first battery pack engaging portion is provided on a first surface of the charging device and is capable of allowing the charging device to transmit power to the first battery pack and allowing the first battery pack to transmit power to the charging device; a second battery pack engaging portion for mechanically and electrically connecting to a second battery pack, wherein the second battery pack engaging portion is provided on a second surface of the charging device different from the first surface and is capable of allowing the charging device to transmit power to the second battery pack and allowing the second battery pack to transmit power to the charging device; and an output port provided on a third surface of the charging device different from the first surface and the second surface and configured to be electrically connectable to an external device to transmit power to the external device.

[0009] Wherein, when the charging device is electrically connected to the mains power grid, it is capable of respectively allocating an output current value to each of the battery packs and / or external devices electrically connected to the charging device for charging according to one or more of the following parameters, and transmitting power to the battery packs and / or external devices simultaneously according to the allocated output current values: the number of the battery packs and / or external devices electrically connected, a preset priority relationship regarding current value allocation, and the rated output current value at the interface of the charging device corresponding to each of the battery packs and / or external devices; and

[0010] Wherein, when at least one battery pack and an external device are simultaneously electrically connected to the charging device and the charging device is not electrically connected to the mains power grid, the charging device is configured to be capable of enabling at least one battery pack to transmit power to the external device.

[0011] In some embodiments, the first battery pack engaging portion includes: a first charging interface through which the first battery pack can transmit power to the charging device; and a first discharging interface through which the charging device can transmit power to the first battery pack, and the second battery pack engaging portion includes: a second charging interface through which the second battery pack can transmit power to the charging device; and a second discharging interface through which the charging device can transmit power to the second battery pack.

[0012] In some embodiments, the first surface and the second surface are respectively located on opposite sides of the charging device.

[0013] In some embodiments, the charging device further includes an input port disposed on the third surface. The input port is configured to be electrically connected to an external adapter electrically connected to the power grid to transmit power to the charging device.

[0014] In some embodiments, when the external adapter is electrically connected to the input port and supplies power to the charging device, the charging device is configured to preferentially allocate an output current value to the external device.

[0015] In some embodiments, when the external adapter is electrically connected to the input port and supplies power to the charging device with an input current value I0, the charging device is configured to be able to, when the first battery pack and the second battery pack are simultaneously electrically connected to the charging device and both are in a charging state, preferentially transmit power to the external device at the rated output current value I1 at the output port, and according to the respective rated capacity levels of the first battery pack and the second battery pack, and in combination with considering the rated output current values at the interfaces to which each battery pack is electrically connected, allocate at least a part of the remaining current value I0 - I1 to the first battery pack and the second battery pack respectively.

[0016] In some embodiments, when the external adapter is electrically connected to the input port and supplies power to the charging device with an input current value I0, the charging device is configured to be able to, when one of the first battery pack and the second battery pack is simultaneously electrically connected to the charging device and both are in a charging state, preferentially transmit power to the external device at the rated output current value I1 at the output port (14), and in combination with considering the rated output current value at the interface to which the battery pack is electrically connected, allocate at least a part of the remaining current value I0 - I1 to the battery pack to which it is electrically connected.

[0017] In some embodiments, when the external adapter is electrically connected to the input port and supplies power to the charging device with an input current value I0, the charging device is configured to be able to, when the first battery pack and the second battery pack are simultaneously electrically connected to the charging device and both are in a charging state, and no external device is electrically connected to the charging device, according to the respective rated capacity levels of the first battery pack and the second battery pack and in combination with considering the rated output current values at the interfaces to which each battery pack is electrically connected, allocate at least a part of the input current value I0 to the first battery pack and the second battery pack respectively.

[0018] In some embodiments, when the sum of the rated output current value I2 at the interface to which the first battery pack is electrically connected and the rated output current value I3 at the interface to which the second battery pack is electrically connected does not exceed the input current value I0, the charging device is configured to be able to transmit power to the first battery pack at the rated output current value I2 and transmit power to the second battery pack at the rated output current value I3.

[0019] In some embodiments, when the sum of the rated output current values at the interfaces where the first battery pack and the second battery pack are electrically connected exceeds the total current value that can be allocated to the first battery pack and the second battery pack: If the rated capacity level of the first battery pack is higher than that of the second battery pack, the current value allocated to the first battery pack is higher than the current value allocated to the second battery pack; and if the rated capacity level of the first battery pack is equal to that of the second battery pack, the current value allocated to the first battery pack is equal to the current value allocated to the second battery pack.

[0020] In some embodiments, when the first battery pack and the second battery pack are simultaneously electrically connected to a charging device while the charging device is not electrically connected to the power grid, the charging device is configured to be able to control the power transmission from the first battery pack and the second battery pack to the external device according to the respective remaining power of the first battery pack and the second battery pack.

[0021] In some embodiments, the charging device is configured to be able to, when the remaining power of the first battery pack is higher than that of the second battery pack, control the first battery pack to transmit power to the external device until the remaining power of the first battery pack and the remaining power of the second battery pack are equal; and when the remaining power of the first battery pack is equal to the remaining power of the second battery pack, control the first battery pack and the second battery pack to transmit power to the external device simultaneously.

[0022] In some embodiments, the first discharge interface, the second discharge interface, and / or the input port are USB-C interfaces, and / or the output port is a USB-A interface.

[0023] In some embodiments, the charging device includes a housing, and the housing includes: a main body portion; and a first end cap and a second end cap located at opposite ends of the main body portion, wherein the first end cap and the second end cap are configured to be respectively capable of engaging with opposite ends of the main body portion to jointly define the internal space of the housing, wherein a first surface is formed by the first end cap, a second surface is formed by the second end cap, and a third surface is formed by the main body portion.

[0024] In some embodiments, the first end cap and the second end cap are configured to have a concave structure that is recessed into the internal space of the housing, and the concave structure is configured to be able to cooperate with the corresponding convex structures on the first battery pack and the second battery pack in shape to accommodate the convex structures when the battery packs are connected to the charging device, and wherein the first surface and the second surface are respectively formed by the bottom surfaces of the concave structures of the first end cap and the second end cap.

[0025] In some embodiments, a control component is disposed within the housing of the charging device. The control component includes: a first circuit board located at an intermediate position of the main body portion and extending substantially parallel to the first end cap and the second end cap; a second circuit board and a third circuit board respectively located on both sides of the extension plane of the first circuit board and extending substantially parallel to the first circuit board; and a fourth circuit board located at a side position of the first circuit board and extending substantially perpendicular to the first circuit board.

[0026] In some embodiments, the first charging interface and the second charging interface are directly disposed on the first circuit board, extending in opposite directions from opposite side surfaces of the first circuit board, and first openings are provided on both the first surface and the second surface to allow the first charging interface and the second charging interface to be exposed to corresponding interfaces on the battery pack.

[0027] In some embodiments, each of the first charging interface and the second charging interface includes: a plurality of terminals configured to extend from the first circuit board toward the first openings on the corresponding one of the first surface and the second surface. The plurality of terminals include: a positive charging terminal and a negative charging terminal that can engage with corresponding terminals in the connected battery pack to allow the battery pack to transmit power to the charging device; and a receiving portion disposed around the plurality of terminals, the receiving portion being configured to extend from the first circuit board to be flush with the first opening on the corresponding one of the first surface and the second surface and to cooperate with the shape of the first opening, and wherein the receiving portion is configured to cooperate with the shape of a protruding portion of the corresponding interface of the connected battery pack and to receive the protruding portion.

[0028] In some embodiments, the plurality of terminals further include: a temperature terminal; an encrypted communication terminal; and a positive discharge terminal and a negative discharge terminal that can engage with corresponding terminals in the connected battery pack to allow the charging device to transmit power to the battery pack.

[0029] In some embodiments, the first discharge interface and the second discharge interface are respectively disposed on surfaces of the second circuit board and the third circuit board facing away from each other, and extend in opposite directions beyond second openings respectively provided on the first surface and the second surface for allowing the first discharge interface and the second discharge interface to be exposed to corresponding interfaces of the connected battery pack.

[0030] In some embodiments, the input port and the output port are disposed on the fourth circuit board and extend toward the main body portion of the housing to a position flush with third openings and fourth openings respectively provided on the third surface for allowing the input port and the output port to be exposed to corresponding interfaces of an external adapter and an external device.

[0031] In some embodiments, the main body portion of the housing is configured as a layered structure, the layered structure including an inner support layer and a covering layer covering the outside of the support layer, wherein the support layer is made of a plastic material and the covering layer is made of a thermoplastic elastomer material.

[0032] In some embodiments, the thickness of the support layer is 1.8 mm and the thickness of the covering layer is 1.2 mm.

[0033] In some embodiments, the third opening and the fourth opening on the third surface are formed in the support layer, and the covering layer is provided with a material removal area around the third opening and the fourth opening, and

[0034] wherein the covering layer is hermetically fixed to the support layer along the edge of the material removal area to form a sealing edge, and the width of the sealing edge in the direction perpendicular to the edge extension direction is 1 mm.

[0035] In some embodiments, the first circuit board, the second circuit board, and / or the third circuit board are fixedly connected to the housing by threaded connection, and wherein the fourth circuit board is fixedly connected to the first circuit board by a bracket, and the second circuit board and / or the third circuit board are relatively fixed to the first circuit board by a lapping member.

[0036] In some embodiments, the bracket is provided with a sliding portion for cooperating with a slide rail provided on the inner wall of the housing to guide the control member into the housing.

[0037] In some embodiments, the first battery pack engaging portion and the second battery pack engaging portion are provided with snap receiving portions for cooperating with corresponding snap members provided on the first battery pack and the second battery pack to fixedly mechanically connect the battery pack to the charging device.

[0038] In some embodiments, if the remaining power of the first battery pack is higher than the remaining power of the second battery pack, the current value allocated to the first battery pack is lower than the current value allocated to the second battery pack; and if the remaining power of the first battery pack is equal to the remaining power of the second battery pack, the current value allocated to the first battery pack is equal to the current value allocated to the second battery pack.

[0039] In some embodiments, when the charging device is not electrically connected to the power grid and the first battery pack and / or the second battery pack are electrically connected to the charging device, the charging device is configured to be able to automatically wake up and provide power to an external device when the external device is electrically connected to the charging device.

[0040] According to another aspect of the present invention, there is provided a charging system, the charging system including: the charging device according to any one of the foregoing embodiments; and at least one of an external device, an external adapter, and a plurality of battery packs capable of being mechanically and electrically connected to the charging device.

[0041] According to the present invention, two battery pack engaging portions for engaging with a rechargeable battery pack of a power tool are arranged on different surfaces (the first and second surfaces of opposite ends) of the charging device. Each engaging portion can achieve bidirectional current transmission between the charging device and the battery pack connected to this engaging portion. And a charging interface for obtaining power from the power grid and a discharging interface for supplying power to an external device are arranged on the third surface (for example, on the peripheral side) of the charging device. Such a charging device can provide multiple charging and discharging functions / modes, and has a simple and compact structure, which is convenient to carry. In addition, the charging device of the present invention controls the charging and discharging operations of the battery pack / external device connected to the charging device in a preset manner, whether it is connected to the power grid or not. This control method has high flexibility and can control current distribution according to multiple parameters, thereby allowing the charging device and the charging system to be applied to a variety of different scenarios and reducing the need for manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] To better understand the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same components. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no restrictive effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0043] Figure 1 A perspective view of a charging device according to a preferred embodiment of the present invention is shown, in which a first battery pack engaging portion is shown;

[0044] Figure 2 Another perspective view of a charging device according to a preferred embodiment of the present invention is shown, in which a second battery pack engaging portion is shown;

[0045] Figure 3 An exploded view of a charging device according to a preferred embodiment of the present invention is shown;

[0046] Figure 4 A schematic view of the first end cover of the housing of a charging device according to a preferred embodiment of the present invention is shown;

[0047] Figure 5 A schematic view of the main body component of the housing of a charging device according to a preferred embodiment of the present invention is shown;

[0048] Figure 6 A schematic view of the control component of a charging device according to a preferred embodiment of the present invention is shown;

[0049] Figure 7 A schematic view of the control component of a charging device according to another preferred embodiment of the present invention is shown;

[0050] Figures 8 to 9 shows Figure 6 a schematic view of another perspective of the control component of the charging device shown; and

[0051] Figure 10 shows a perspective view of an exemplary battery pack that can cooperate with the charging device according to the present invention.

[0052] Description of reference numerals:

[0053] 1: Charging device; 11: First battery pack engaging portion; 111: First charging interface; 1111a: Positive charging terminal; 1111b: Negative charging terminal; 1112a: Communication terminal; 1112b: Communication terminal; 1113: Accommodating portion; 112: First discharge interface; 113: Snap receiving portion; 12: Second battery pack engaging portion; 121: Second charging interface; 122: Second discharge interface; 13: Input port; 14: Output port; 15: Housing; 151: First end cap; 1511: Concave structure of the first end cap; 15111: Bottom surface of the concave structure; 15112: First opening; 15113: Second opening; 152: Second end cap; 153: Main body portion; 1531: Third opening; 1532: Fourth opening; 1533: Snap structure; 1534: Material removal area; 16: Control component; 161: First circuit board; 162: Second circuit board; 163: Third circuit board; 164: Fourth circuit board; 165: Bracket; 1651: Ear; 1652: Screw; 1653: Screw receiving structure; 1654: Sliding portion; 167: Wire; 168: Lapping member; 2: Battery pack; 21: Engaging structure of the battery pack; 211: Discharge interface of the battery pack; 212: Charging interface of the battery pack; 213: Snap member of the battery pack; 2511: Protruding structure of the battery pack Detailed Description of the Invention

[0054] Now referring to the accompanying drawings, the detailed description of the present invention will be given. What is described here is only the preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention on the basis of the preferred embodiment, and such other ways also fall within the scope of the present invention.

[0055] According to one aspect of the present invention, there is provided a charging device configured to be operably mechanically and electrically connected to a plurality of battery packs on different sides thereof to transmit power to the battery packs or allow the battery packs to transmit power to the charging device. The charging device includes: a first battery pack engaging portion for mechanically and electrically connecting to a first battery pack, which is disposed on a first surface of the charging device and is capable of allowing the charging device to transmit power to the first battery pack and allowing the first battery pack to transmit power to the charging device; a second battery pack engaging portion for mechanically and electrically connecting to a second battery pack, which is disposed on a second surface of the charging device different from the first surface and is capable of allowing the charging device to transmit power to the second battery pack and allowing the second battery pack to transmit power to the charging device; and an output port disposed on a third surface of the charging device different from the first surface and the second surface, which is capable of being electrically connected to an external device to transmit power to the external device. Preferably, the first surface and the second surface are respectively located on opposite sides of the charging device.

[0056] Preferably, the first battery pack engaging portion includes: a first charging interface through which the first battery pack can transmit power to the charging device; and a first discharging interface through which the charging device can transmit power to the first battery pack, and the second battery pack engaging portion includes: a second charging interface through which the second battery pack can transmit power to the charging device; and a second discharging interface through which the charging device can transmit power to the second battery pack.

[0057] More preferably, the charging device further includes an input port disposed on the third surface, which is capable of being electrically connected to an external adapter electrically connected to the power grid to transmit power to the charging device.

[0058] The battery pack as described above can be a rechargeable secondary battery pack that can be attached to a power tool to supply power to the power tool and can be detached from the power tool and connected to the charging device for charging and discharging operations. The power tool as described above can be various frequently movable power tools, household cleaning devices, kitchen devices, or medical devices that can be conceived by those skilled in the art, such as a chef machine, a grinder, a nail gun, a hammer drill, a vacuum cleaner, a drill, etc. The external device as described above can be various small electrical devices that can be conceived by those skilled in the art, such as digital products / electronic devices such as mobile phones, tablets, computers, cameras, or power-consuming devices with relatively small power such as portable lighting devices. Next, with reference to the embodiments exemplarily shown in the accompanying drawings, the content of the present invention will be described in detail. It should be noted that the following description is merely exemplary and not restrictive.

[0059] Figure 1The charging device 1 according to a preferred embodiment of the present invention is shown, which can be operably and detachably mechanically and electrically connected to a battery pack such as a power tool. The charging device 1 includes a first battery pack engaging portion 11 on the first surface of the first side, and this engaging structure 11 can cooperate with the corresponding engaging structure 21 on the battery pack 2 when the first battery pack (for example, Figure 10 the battery pack 2 shown) is installed on the charging device 1 to achieve mechanical connection and electrical connection.

[0060] Specifically, the first battery pack engaging portion 11 includes a first charging interface 111, which can engage with the corresponding discharge interface 211 on the first battery pack to allow the first battery pack to transmit power to the charging device, that is, the electrical connection between the first charging interface 111 and the corresponding discharge interface 211 on the corresponding battery pack 2 can allow unidirectional power transmission from the battery pack to the charging device. Further, the first battery pack engaging portion 11 also includes a first discharge interface 112, which can engage with the corresponding charging interface 212 on the first battery pack to allow the charging device to transmit power to the first battery pack via this interface, that is, the electrical connection between the first discharge interface 112 and the corresponding charging interface 212 on the corresponding battery pack 2 can allow unidirectional power transmission from the charging device to the battery pack. In this way, through the first battery pack engaging portion 11, bidirectional power transmission between the battery pack and the charging device can be achieved. It can be understood that those skilled in the art can, according to needs, set the above-mentioned first charging interface and / or first discharge interface as a bidirectional current transmission interface (for example, adding terminals to the interface or changing the communication control method of the interface) so that a single interface itself can both achieve power transmission from the battery pack to the charging device and power transmission from the charging device to the battery pack. In this way, the charging device can have higher compatibility, enabling battery packs with different interface types to be attached to the charging device for charging and discharging operations. For example, a battery pack having only the above-mentioned interface 211 or only the above-mentioned interface 212 can be connected to the charging device 1 for power transmission.

[0061] Further, the above-mentioned battery pack 2 preferably further includes a structure for mechanically fixing to the first battery pack engaging portion 11 of the charging device 1, for example, Figure 10 the snap member 213 shown. When the engaging structure 21 of the battery pack 2 is inserted into the appropriate position in the first battery pack engaging portion 11, the snap member 213 of the battery pack is snap-fitted with the corresponding snap receiving portion 113 on the charging device, so that the battery pack is fixed in place on the charging device and is not easily detached without manual operation. This arrangement allows the charging device and the connected battery pack to be conveniently carried as a whole, with reliability and convenience.

[0062] Further preferably, asFigure 2 As shown, the charging device 1 includes a second battery pack engaging portion 12 on the second surface of the second side, which is preferably different from the first side and the first surface described above. More preferably, the first side and the second side are two opposite end sides of the charging device 1. The second battery pack engaging portion 12 can cooperate with the corresponding engaging structure of the battery pack when the second battery pack is installed to achieve mechanical connection and electrical connection. Similar to what was discussed above regarding the first battery pack engaging portion 11, the second battery pack can also be Figure 10 the battery pack 2 shown, and preferably, the second battery pack engaging portion 12 can have the same or similar structure as the above-mentioned first battery pack engaging portion 11. For example, it has a second charging interface 121, a second discharging interface 122, and a receiving portion 123. The structures and functions of these components are preferably the same as the corresponding components on the first battery pack engaging portion 11, and will not be elaborated here.

[0063] Further preferably, the charging device 1 further includes an input port 13 and an output port 14 provided on a third surface different from the above-mentioned first surface and second surface. Preferably, the third surface is located on the circumferential side between the two ends of the charging device 1. Among them, the input port 13 is configured to be electrically connected to an external adapter to be electrically connected to the power grid through the adapter and obtain power from the power grid. The adapter can be a common interface converter on the market, which contains a transformer inside for converting the alternating current of the mains power grid into direct current provided to the charging device of the present invention. For example, direct current with a voltage of 5V and a current of 4A. The output port 14 is configured to be electrically connected to an external device such as a digital / electronic device to transmit power to the external device. For example, power can be transmitted to the external device by electrically connecting a data cable commonly used for charging electronic devices such as mobile phones and computers between the output port 14 and the corresponding external device.

[0064] According to the above arrangement of the present invention, two battery pack engaging portions for engaging with the rechargeable battery pack of the power tool are arranged on different surfaces (the first and second surfaces of the opposite ends) of the charging device. Each engaging portion can achieve bidirectional current transmission between the charging device and the battery pack connected to the engaging portion. And a charging interface for obtaining power from the power grid and a discharging interface for providing power to an external device are arranged on the third surface (for example, located on the circumferential side) of the charging device. Such a charging device can provide multiple charging and discharging functions / modes, and has a simple and compact structure and is convenient to carry, and can be used in multiple scenarios. Such a charging device can provide multiple charging and discharging functions / modes. For example, it can be electrically connected to the power grid to supply power to one or more connected battery packs and external devices at the same time, and can also allow the battery pack to reverse power transmission to supply power to the connected external device when the mains power cannot be obtained.

[0065] Arranging the charging interfaces 111, 121 and the discharging interfaces 112, 122 for connecting the battery packs on the same surface of the charging device can make the overall structure compact, and at the same time prevent these interfaces and their corresponding battery pack interfaces from interfering with other structures in the connected state. This arrangement can further prevent the dangerous situation where due to the user's misoperation, the battery pack transmits power to the power tool through its discharging interface 211 while receiving power from the charging device through its charging interface 212, that is, it plays a certain "anti-fooling" role.

[0066] In a preferred embodiment, the first discharging interface 112, the second discharging interface 212, and / or the input port 13 of the above-mentioned charging device 1 can be, for example, a USB-C interface, and the output port 14 can be, for example, a USB-A interface. It can be understood that those skilled in the art can select a suitable type of interface according to needs to achieve the above functions. In a preferred embodiment, the rated power transmission rate or the rated transmission current value of the above-mentioned charging interfaces 111, 121 for the battery pack is higher than the rated power transmission rate or the rated transmission current value of the discharging interfaces 112, 122.

[0067] Next, refer to Figures 3 to 9 , and a detailed description will be given to the specific structure of the charging device 1 according to the preferred embodiment of the present invention. As Figure 3 shown, the charging device 1 includes a housing 15 and a control component 16 inside the housing. The housing 15 includes a main body portion 153 and a first end cover 151 and a second end cover 152 located at opposite ends of the main body portion. The two end covers and the main body portion are detachably joined to each other by, for example, snap fits or the like to jointly define the internal accommodation space of the housing 15. It can be understood that the above-mentioned end covers can also be detachably or non-detachably joined to the main body portion by other easily conceivable methods, for example, by gluing, hooking, welding, screw connection, etc. Correspondingly, as described above, the first surface is formed by the first end cover 151, the second surface is formed by the second end cover 152, and the third surface is formed by the main body portion 153.

[0068] Figure 4 Exemplarily shows the specific structure of the first end cover 151 of the above-mentioned housing 15. For the sake of clarity and conciseness, other components of the charging device 1 are not shown. It should be noted that in this embodiment, the structure and corresponding functions of the second end cover 152 are preferably basically the same as those of the first end cover 151. Therefore, the following only takes Figure 3 the shown first end cover 151 as an example to describe the specific structure of the end cover, and the second end cover 152 will not be described repeatedly. Specifically, the first end cover 151 has a concave structure 1511 that is concave towards the internal space of the housing 15, and this concave structure can be connected to the first battery pack (for example,Figure 10 is shaped to cooperate with the corresponding protruding structure 2511 of the battery pack 2) shown to receive the protruding structure 2511 when the battery pack is inserted into the recessed structure. Correspondingly, the first surface as described above is formed by the bottom surface 15111 of the recessed structure 1511. Further, a first opening 15112 and a second opening 15113 corresponding to the first charging interface 111 and the first discharging interface 112 respectively are formed in the bottom surface 15111 of the first end cap 151, for allowing the first charging interface 111 and the first discharging interface 112 to be exposed from the first opening 15112 and the second opening 15113 respectively in the assembled state, so as to allow the corresponding interfaces on the battery pack to be paired with them. It can be understood that, preferably, the second end cap 152 also includes the above-mentioned recessed structure, bottom surface, and opening. In addition, the receiving portion 113 corresponding to and snap-fitted with the snap member 213 of the battery pack 2 preferably includes through holes formed in the side portions of the recessed structures of the first and second end caps, and the through holes allow the snap member 213 to extend through the end caps 151, 152, so as to cooperate with the snap structures correspondingly arranged on the inner wall of the main body member 153 of the housing 15, so that the battery pack is fixedly connected to the charging device.

[0069] Figure 5 Exemplarily shown is the specific structure of the main body portion 153 of the housing 15 as described above. For the sake of clarity and conciseness, other components of the charging device 1 are not shown. The main body portion 153 extends circumferentially between the first end cap and the second end cap. Third openings 1531 and fourth openings 1532 corresponding to the input port 13 and the output port 14 respectively are arranged on one or more circumferential side surfaces of the main body portion (i.e., the third surface as described above), for allowing the input port 13 and the output port 14 to be exposed from the third openings 1531 and the fourth openings 1532 respectively in the assembled state, so that the corresponding interfaces of the corresponding adapters and the data cables connecting external devices can be paired with these interfaces. Figure 5 In the illustrated embodiment, the main body portion surrounds to form a substantially cuboid shape, and the third and fourth openings and the corresponding input and output ports are arranged on the same side surface of the cuboid. This structure arranged on the same side is relatively compact and convenient for operation. It can be understood that those skilled in the art can design the shape of the main body portion as needed, such as cylindrical, and / or arrange the above-mentioned third and fourth openings (and the corresponding input and output ports) on different side surfaces of the main body portion respectively, and / or arrange multiple third and fourth openings (and the corresponding input and output ports) on the same side surface or different side surfaces respectively. These variations all fall within the protection scope of the present invention.

[0070] Further, as Figure 5As shown, the main body portion 153 further includes the snap structure 1533 provided on the inner wall as described above. When the battery pack is installed in the charging device and fixed in place, the snap member 213 of the battery pack 2 extends through the corresponding through holes provided in the end caps 151 and 152, and cooperates with the snap structure 1533 of the main body portion to form a fixed connection. That is, the receiving portion 113 corresponding to and snap-fitting with the snap member 213 of the battery pack 2 is formed by the through holes on the side of the recessed structure of the end cap and the snap structure on the inner wall of the main body portion, so as to firmly hold the connected battery pack on the charging device until the user manually unlocks the snap to separate the two. This mechanical connection and fixation allows continuous charge and discharge operations, for example, during transportation and carrying, without being easily disengaged.

[0071] Furthermore, the main body portion 153 is preferably constructed as a layered structure, which includes a support layer near the inner space of the housing for supporting the overall structure of the main body portion, and a covering layer covering the outer side of the support layer near the outside. The covering layer can increase the surface friction of the charging device, thereby facilitating grasping and carrying, and can also enhance the touch feeling. The covering layer preferably extends to wrap the support layer in a substantially entire circumferential side extension region of the main body portion except for the regions near the above-mentioned third opening 1531 and fourth opening 1532 provided on the support layer. That is, the covering layer wraps most of the circumferential side of the support layer, and only material removal regions 1534 are provided near the openings 1531 and 1532 to allow electrical connection. Preferably, the covering layer is hermetically fixed to the outer surface of the support layer along the edge of the material removal region 1534 to form a sealing edge, and the width of the sealing edge in the direction perpendicular to the edge extension direction is preferably 1 mm. Further preferably, the covering layer also wraps the end surfaces at both ends of the support layer, so that when the main body portion is assembled with the first and second end caps, the side edges of the end caps facing the main body portion are in direct contact with the covering layer of the main body portion, so as to improve the sealing performance and reduce the wear caused by assembly. Further preferably, the thickness of the support layer is 1.8 mm, and the thickness of the covering layer is 1.2 mm. Further preferably, the support layer is made of a hard plastic material (such as PC, ABS material or a combination thereof), and the covering layer is made of a thermoplastic elastomer material (such as TPE, TPU material or a combination thereof).

[0072] Furthermore, Figures 6 to 9 An exemplary arrangement of the control component 16 inside the housing 15 according to the present invention is shown. The control component 16 includes a plurality of circuit boards, electronic components provided on each circuit board, and the above-mentioned components related to the power transmission interface. For the sake of simplicity and clarity, some structures such as electronic components on the circuit boards are not shown in the figure. As Figure 6As shown, the control component 16 includes a first circuit board 161 located at the middle position of the main body part and extending substantially parallel to the extension direction of the first and second end caps, a second circuit board 162 and a third circuit board 163 respectively located on both sides of the extension plane of the first circuit board and extending substantially parallel to the first circuit board, and a fourth circuit board 164 located at the side position of the first circuit board and extending substantially perpendicular to the first circuit board.

[0073] Further preferably, the first circuit board 161 is the main circuit board, on which various electronic components (not shown) for controlling the operation of the charging device are arranged, and the other circuit boards are electrically connected and communicatively connected to the first circuit board. For example, in Figure 9 the embodiment shown, the second and third circuit boards 162, 163 are electrically connected and communicatively connected to the first circuit board 161 through electrical connection devices 166, and the fourth circuit board is electrically connected and communicatively connected to the first circuit board 161 through a wire 167. It can be understood that the connection manner between the circuit boards is not limited to the manner shown in the above embodiment, and those skilled in the art can, according to actual needs, achieve electrical connection and communicative connection between the circuit boards through various different connection manners to achieve various control modes.

[0074] Furthermore, the above-mentioned first charging interface 111 and second charging interface 121 are arranged on the first circuit board 161, extending from opposite side surfaces of the circuit board in opposite directions, that is, extending towards the first end cap 11 and the second end cap 12 respectively to the corresponding openings provided on the end caps, for example, the first opening 15112 on the first end cap 11. Further, each of the first charging interface 111 and the second charging interface 121 includes: a plurality of terminals extending from the corresponding opening opened on the surface of the first circuit board 161 towards the corresponding end cap, and a receiving portion provided around the plurality of terminals. The receiving portion is configured to extend from the first circuit board 161 to be flush with the corresponding opening on the surface of the corresponding end cap, and cooperate with the shape of the opening, and preferably, the receiving portion cooperates with the protruding portion of the corresponding interface of the corresponding battery pack (for example, the discharge interface 211 of the battery pack 2), and is configured to be able to receive the protruding portion during installation.

[0075] More specifically, referring to Figure 8, the multiple terminals of the first charging interface 111 include: a positive charging terminal 1111a and a negative charging terminal 1111b, which can be engaged with corresponding terminals in the connected corresponding battery pack to allow the battery pack to transmit power to the charging device; a communication terminal 1112a (for example, an NTC terminal) can be used to detect temperature or obtain temperature information; and a communication terminal 1112a, which is used to be electrically connected to a corresponding encrypted communication terminal on the battery pack and perform authentication set for security purposes. When the mutual authentication is successful, that is, "handshake successful", further operations such as power supply or charging can continue between the battery pack and the charging device.

[0076] More preferably, those skilled in the art can also arrange more terminals in the first charging interface 111 as needed. For example, a positive discharge terminal and a negative discharge terminal that can be engaged with corresponding terminals in the connected corresponding battery pack are provided to allow the charging device to transmit power to the battery pack. In this way, the first charging interface of the charging device can not only receive power from the battery pack but also supply power to the battery pack. The charging device can be controlled to select to supply power to the connected battery pack through interface 111 or interface 112, which improves the control possibility of the charging device. In addition, a receiving portion 1113 as described above is provided around the multiple terminals. It should be noted that although the multiple terminals and the receiving portion are described in detail with reference to the first charging interface 111 above, the second charging interface 112 also preferably has the same or similar symmetric arrangement, which will not be elaborated here.

[0077] Continue to refer to Figure 6 , the first discharge interface 112 and the second discharge interface 122 described above are respectively arranged on the surfaces of the second circuit board 162 and the third circuit board 163 on the side facing away from each other, and extend in opposite directions beyond the corresponding openings (for example, the second opening 15113 on the first end cap 151) formed on the surfaces of the corresponding end caps. This arrangement of the second and third circuit boards 162, 163 closer to the end caps than the first circuit board 161 allows the first and second discharge interfaces 112, 122 (for example, USB-C type discharge interfaces) with smaller sizes compared to the first and second charging interfaces 111, 121 to extend out of the end cap surface, so that they can be engaged with the corresponding interfaces 212 of the battery pack.

[0078] Furthermore, the input port 13 and the output port 14 described above are arranged on the fourth circuit board 164 and extend to a position flush with the corresponding openings toward the corresponding third opening 1531 and fourth opening 1532 on the surface of the main body portion 153 of the housing, so that they can be engaged with the corresponding interfaces of the adapter and external devices.

[0079] Preferably, the first, second, and third circuit boards are fixed to the corresponding receiving structures on the inner wall of the main body portion 153 of the housing 15 by one or more screws located on the periphery of the circuit boards, and thus are fixed in the housing. In addition, the second circuit board 162 and the third circuit board 163 are preferably lapped on the lapping members extending from the back side of the accommodating portions 1113 of the first and second charging interfaces 111, 121 (for example, Figure 9 the lapping member 168 shown), and thus are kept relatively fixed to the first circuit board 161.

[0080] Additionally preferably, as Figure 5 shown, a bracket 165 is further provided for fixing the fourth circuit board 164 to the first circuit board 161, and thus for fixing the fourth circuit board 164 inside the housing 15. The bracket 165 is fixed to the fourth circuit board through the mutual connection of a screw receiving structure 1653 and a screw passing through the fourth circuit board 164. The bracket 165 further includes two ears 1651 located on both sides of the bracket body, and holes for receiving screws 1652 are formed in the ears, and thus the bracket can be fixed to the first circuit board 161 by connecting the ears to the screws. In Figure 7 another preferred embodiment shown, the bracket 165 may further include a sliding portion 1654, which can cooperate with the slide rail structure on the inner wall of the main body portion 153 of the housing to facilitate the sliding of the bracket driving the circuit board to an appropriate position during assembly.

[0081] Next, an exemplary description is given of the charge and discharge control mode of the charging device 1 according to the present invention. Generally speaking, the charging device of the present invention can perform charge and discharge operations according to the following control strategies. When the charging device is electrically connected to the mains power grid, it can respectively allocate output current values to each of the battery pack and / or external device electrically connected to the charging device for charging, based on one or more of the following parameters, and simultaneously transmit power to the battery pack and / or external device according to the allocated output current values: the number of the electrically connected battery pack and / or external device, the preset priority relationship regarding current value allocation, and the rated output current value at the interface of the charging device corresponding to each of the battery pack and / or external device. When at least one battery pack (for example, the first battery pack and / or the second battery pack) and an external device are simultaneously electrically connected to the charging device, and the charging device is not electrically connected to the mains power grid, the charging device is configured to enable the at least one battery pack to transmit power to the external device.

[0082] Specifically, the charging device of the present invention can operate in the following multiple modes.

[0083] When the entire charging system is powered by the mains power grid, i.e., when the external adapter is electrically connected to the input port 13 and supplies power to the charging device with an input current value I0, the charging device preferentially transmits power to the external device at the rated output current value I1 at the output port, and then distributes the remaining power to the battery pack. Specifically, there are at least the following multiple situations:

[0084] Situation 1: When the first battery pack, the second battery pack, and the external device are simultaneously electrically connected to the charging device and are all in a charging state, the charging device preferentially transmits power to the external device at the rated output current value I1 at the output port, and according to the respective rated capacity levels of the first battery pack and the second battery pack and in combination with considering the rated output current values at the charging device interfaces (e.g., the first and second charging interfaces 111, 121, and / or the first and second discharging interfaces 112, 122 as described above) to which each battery pack is connected, at least a part of the current value I0 - I1 of the remaining current is respectively distributed to the first battery pack and the second battery pack;

[0085] Situation 2: When only one of the first battery pack and the second battery pack, and the external device are simultaneously electrically connected to the charging device and are all in a charging state, the charging device preferentially transmits power to the external device at the rated output current value I1 at the output port, and then in combination with considering the rated output current value at the charging device interface to which this battery pack is electrically connected, at least a part of the current value I0 - I1 of the remaining current is distributed to this battery pack;

[0086] Situation 3: When the first battery pack and the second battery pack are simultaneously connected to the charging device and are all in a charging state, and no external device is connected to the charging device, the charging device distributes at least a part of the input current value I0 to the first battery pack and the second battery pack respectively according to the respective rated capacity levels of the first battery pack and the second battery pack and in combination with considering the rated output current values at the charging device interfaces to which each battery pack is electrically connected.

[0087] As an example, in Case 2, when the rated output current value I2 or I3 at the interface where the battery pack connected to the charging device in the first battery pack and the second battery pack is connected does not exceed the remaining current value I0 - I1, the charging device is configured to be able to output power to the battery pack at the rated output current value I2 or I3. As an example, in Case 3, when the sum of the rated output current value I2 at the charging device interface (the first charging interface 111 or the first discharging interface 112 in the first battery engaging structure 11) to which the first battery pack is connected and the rated output current value I3 at the charging device interface (the second charging interface 121 or the second discharging interface 122 in the second battery engaging structure 11) to which the first battery pack is connected does not exceed the input current value I0, the charging device is configured to be able to transmit power to the first battery pack at the rated output current value I2 and transmit power to the second battery pack at the rated output current value I3.

[0088] In some cases, such as in Case 1 and / or Case 3, when the sum of the above-mentioned rated output current values I2 and I3 exceeds the total current value that can be allocated to the first battery pack and the second battery pack, if the rated capacity level of the first battery pack is higher than that of the second battery pack, the current value allocated to the first battery pack is higher than the current value allocated to the second battery pack; and if the rated capacity level of the first battery pack is equal to that of the second battery pack, the current value allocated to the first battery pack is equal to the current value allocated to the second battery pack.

[0089] In other cases, such as in Case 1 and / or Case 3, when the sum of the above-mentioned rated output current values I2 and I3 exceeds the total current value that can be allocated to the first battery pack and the second battery pack, if the remaining power of the first battery pack is higher than that of the second battery pack, the current value allocated to the first battery pack is lower than the current value allocated to the second battery pack; if the remaining power of the first battery pack is equal to that of the second battery pack, the current value allocated to the first battery pack is equal to the current value allocated to the second battery pack.

[0090] As an example, Table 1 below shows the current value distribution of the charging device according to the present invention in different charging modes. The charging device in this table receives an input current of 5V, 4A from an external adapter through the input port 13, that is, in this example, the above-mentioned input current value I0 is 4A. In addition, the rated output current value I1 at the output port for electrically connecting to an external device, the rated output current value I2 at the charging device interface to which the first battery pack is connected, and the rated output current value I3 at the charging device interface to which the first battery pack is connected are all 2A in this example. Additionally, the first and second battery packs in the example are battery packs of the same type and the same specification, with a rated voltage of 12V and the same rated battery capacity.

[0091] Table 1

[0092]

[0093]

[0094] When the entire charging system is not connected to the mains power grid, that is, the input port 13 is not connected to the grid via an adapter to obtain power, the charging device is configured to enable at least one of the first battery pack and the second battery pack to transmit power to an external device. Specifically, there are at least the following multiple situations:

[0095] Situation 1: When only one of the first battery pack and the second battery pack, and the external device are electrically connected to the charging device at the same time, the charging device is configured to enable the connected battery pack to transmit power to the external device;

[0096] Situation 2: When the first battery pack, the second battery pack, and the external device are electrically connected to the charging device at the same time, the charging device is configured to control the power transmission from the first battery pack and the second battery pack to the external device according to the respective remaining power of the first battery pack and the second battery pack.

[0097] More specifically, in Situation 2 above, the charging device is configured to be able to: when the remaining power of the first battery pack is higher than the remaining power of the second battery pack, control the first battery pack to transmit power to the external device until the remaining power of the first battery pack is equal to the remaining power of the second battery pack; and when the remaining power of the first battery pack is equal to the remaining power of the second battery pack, control the first battery pack and the second battery pack to transmit power to the external device simultaneously.

[0098] It should be noted that when the charging device is not electrically connected to the grid and the first battery pack and / or the second battery pack are electrically connected to the charging device, the charging device is configured to be able to automatically wake up and provide power to the external device when the external device is electrically connected to the charging device.

[0099] According to another aspect of the present invention, there is provided a charging system, which includes the aforementioned charging device, and at least one of an external device, an external adapter, and one or more battery packs for power tools that can be mechanically and electrically connected to the charging device.

[0100] As described above, the charging device according to the present invention and the charging system formed by it and an external device, one or more battery packs, and / or an adapter electrically connected to the grid can provide a variety of different charging and discharging modes, power various types and specifications of electrical equipment and / or battery packs, realize multi-functional charging and discharging operations, have high integration and are convenient to carry, and users can select various charging and discharging modes according to actual needs.

[0101] The above description of various embodiments of the present invention is provided for the purpose of description to a person of ordinary skill in the relevant art. It is not intended to exclude or limit the present invention to a single disclosed embodiment. As above, a person of ordinary skill in the art will understand various alternatives and modifications of the present invention. Thus, while some alternative embodiments have been specifically described, other embodiments will be apparent or relatively easily developed by a person of ordinary skill in the art. The present invention is intended to embrace all alternatives, modifications, and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. A charging device (1), which is configured to be operably mechanically and electrically connected to a plurality of battery packs (2) on its different sides to transmit electric power to the battery packs or allow the battery packs to transmit electric power to the charging device, characterized in that, The charging device includes: A first battery pack engaging portion (11) for mechanically and electrically connecting to a first battery pack. The first battery pack engaging portion is disposed on a first surface of the charging device and is capable of allowing the charging device to transmit power to the first battery pack and allowing the first battery pack to transmit power to the charging device; A second battery pack engaging portion (12) for mechanically and electrically connecting to a second battery pack. The second battery pack engaging portion is disposed on a second surface of the charging device different from the first surface and is capable of allowing the charging device to transmit power to the second battery pack and allowing the second battery pack to transmit power to the charging device; and An output port (14) disposed on a third surface of the charging device different from the first surface and the second surface and configured to be electrically connectable to an external device to transmit power to the external device, wherein when the charging device is electrically connected to the mains power grid, it can, according to one or more of the following parameters, respectively allocate output current values to each of the battery packs and / or external devices electrically connected to the charging device for charging and transmit power to the battery packs and / or external devices simultaneously according to the allocated output current values: the number of the electrically connected battery packs and / or external devices, a preset priority relationship regarding current value allocation, and the rated output current value at the interface of the charging device corresponding to each of the battery packs and / or external devices; and wherein when at least one battery pack and the external device are simultaneously electrically connected to the charging device and the charging device is not electrically connected to the mains power grid, the charging device is configured to enable the at least one battery pack to transmit power to the external device.

2. The charging device (1) according to claim 1, wherein The first battery pack engaging portion (11) includes: A first charging interface (111) through which the first battery pack can transmit power to the charging device; and A first discharging interface (112) through which the charging device can transmit power to the first battery pack, and The second battery pack engaging portion (12) includes: A second charging interface (121) through which the second battery pack can transmit power to the charging device; and A second discharging interface (122) through which the charging device can transmit power to the second battery pack.

3. The charging device (1) according to claim 1, wherein The first surface and the second surface are respectively located on opposite sides of the charging device.

4. The charging device (1) according to claim 2, wherein The charging device further includes an input port (13) disposed on the third surface and configured to be electrically connectable to an external adapter electrically connected to the power grid to transmit power to the charging device.

5. The charging device (1) according to claim 4, characterized in that, When the external adapter is electrically connected to the input port (13) and supplies power to the charging device, the charging device is configured to preferentially allocate the output current value to the external device.

6. The charging device (1) according to claim 5, wherein when the external adapter is electrically connected to the input port (13) and supplies power to the charging device with an input current value I0, the charging device is configured to be capable of when the first battery pack and the second battery pack are simultaneously electrically connected to the charging device and both are in a charging state while being electrically connected to the external device, preferentially transmitting power to the external device at the rated output current value I1 at the output port (14), and allocating at least a portion of the remaining current value I0 - I1 to the first battery pack and the second battery pack respectively according to the respective rated capacity levels of the first battery pack and the second battery pack and in combination with considering the rated output current value at the interface to which each battery pack is electrically connected.

7. The charging device (1) according to claim 5, wherein when the external adapter is electrically connected to the input port (13) and supplies power to the charging device with an input current value I0, the charging device is configured to be capable of when one of the first battery pack and the second battery pack is simultaneously electrically connected to the charging device and both are in a charging state while being electrically connected to the external device, preferentially transmitting power to the external device at the rated output current value I1 at the output port (14), and allocating at least a portion of the remaining current value I0 - I1 to the battery pack to which it is electrically connected in combination with considering the rated output current value at the interface to which the battery pack is electrically connected.

8. The charging device (1) according to claim 5, wherein when the external adapter is electrically connected to the input port (13) and supplies power to the charging device with an input current value I0, the charging device is configured to be capable of when the first battery pack and the second battery pack are simultaneously electrically connected to the charging device and both are in a charging state while no external device is electrically connected to the charging device, allocating at least a portion of the input current value I0 to the first battery pack and the second battery pack respectively according to the respective rated capacity levels of the first battery pack and the second battery pack and in combination with considering the rated output current value at the interface to which each battery pack is electrically connected.

9. The charging device (1) according to claim 8, wherein when the sum of the rated output current value I2 at the interface to which the first battery pack is electrically connected and the rated output current value I3 at the interface to which the second battery pack is electrically connected does not exceed the input current value I0, the charging device is configured to be capable of transmitting power to the first battery pack at the rated output current value I2 and transmitting power to the second battery pack at the rated output current value I3.

10. The charging device (1) according to claim 6 or 8, wherein When the sum of the rated output current values at the interfaces where the first battery pack and the second battery pack are electrically connected exceeds the total current value that can be allocated to the first battery pack and the second battery pack: If the rated capacity level of the first battery pack is higher than that of the second battery pack, the current value allocated to the first battery pack is higher than the current value allocated to the second battery pack; and If the rated capacity level of the first battery pack is equal to that of the second battery pack, the current value allocated to the first battery pack is equal to the current value allocated to the second battery pack.

11. The charging device (1) according to claim 1, characterized in that When the first battery pack and the second battery pack are simultaneously electrically connected to the charging device while the charging device is not electrically connected to the power grid, the charging device is configured to be able to control the power transmission from the first battery pack and the second battery pack to the external device according to the respective remaining power of the first battery pack and the second battery pack.

12. The charging device (1) according to claim 11, characterized in that The charging device is configured to be able to When the remaining power of the first battery pack is higher than that of the second battery pack, control the first battery pack to transmit power to the external device until the remaining power of the first battery pack and the second battery pack is equal; and When the remaining power of the first battery pack is equal to the remaining power of the second battery pack, control the first battery pack and the second battery pack to transmit power to the external device simultaneously.

13. The charging device (1) according to claim 4, characterized in that The charging device includes a housing (15), and the housing includes: A main body part (153); and A first end cover (151) and a second end cover (152) located at opposite ends of the main body part, wherein the first end cover and the second end cover are configured to be respectively capable of engaging with opposite ends of the main body part to jointly define the internal space of the housing, Wherein, the first surface is formed by the first end cover (151), the second surface is formed by the second end cover (152), and the third surface is formed by the main body part (153).

14. The charging device (1) according to claim 13, characterized in that The first end cover (151) and the second end cover (152) are configured to have a concave recess structure (1511) facing the internal space of the housing, and the recess structure is configured to be able to cooperate with the corresponding protruding structures (2511) on the first battery pack and the second battery pack in shape to accommodate the protruding structures when the battery pack (2) is connected to the charging device (1), and wherein the first surface and the second surface are respectively formed by the bottom surface (15111) of the recess structure of the first end cover and the bottom surface of the recess structure of the second end cover.

15. The charging device (1) according to claim 14, characterized in that A control component (16) is provided inside the housing of the charging device, and the control component includes: A first circuit board (161) located at the middle position of the main body part (153) and extending substantially parallel to the first end cover (151) and the second end cover (152); A second circuit board (162) and a third circuit board (163) respectively located on both sides of the extension plane of the first circuit board and extending substantially parallel to the first circuit board; and A fourth circuit board (164) located at the side position of the first circuit board and extending substantially perpendicular to the first circuit board.

16. The charging device (1) according to claim 15, wherein The first charging interface (111) and the second charging interface (121) are directly arranged on the first circuit board (161), extend from opposite side surfaces of the first circuit board in opposite directions respectively, and first openings (15112) allowing the first charging interface and the second charging interface to be exposed to corresponding interfaces on the battery pack are provided on both the first surface and the second surface.

17. The charging device (1) according to claim 16, wherein Each of the first charging interface (111) and the second charging interface (121) includes: A plurality of terminals configured to extend from the first circuit board toward the first openings (15112) of the corresponding surfaces of the first surface and the second surface, and the plurality of terminals include: A positive charging terminal (1111a) and a negative charging terminal (1111b) capable of engaging with corresponding terminals in the connected battery pack to allow the battery pack to transmit power to the charging device; and A receiving portion (1113) provided around the plurality of terminals, the receiving portion being configured to extend from the first circuit board (161) to be flush with the first openings (15112) of the corresponding surfaces of the first surface and the second surface and be in shape fit with the first openings, and wherein the receiving portion is configured to be in shape fit with a protruding portion of the corresponding interface of the connected battery pack and be able to receive the protruding portion.

18. The charging device (1) according to claim 15, wherein The first discharge interface (112) and the second discharge interface (122) are respectively arranged on the surfaces of the second circuit board (162) and the third circuit board (163) facing away from each other, and extend in opposite directions beyond second openings (15113) respectively provided on the first surface and the second surface for allowing the first discharge interface and the second discharge interface to be exposed to corresponding interfaces of the connected battery pack.

19. The charging device (1) according to claim 17, wherein The input port (13) and the output port (14) are arranged on the fourth circuit board (164) and extend towards the main body part of the housing to a position flush with a third opening (1531) and a fourth opening (1532) formed in the third surface, which respectively allow the input port and the output port to be exposed to corresponding interfaces of an external adapter and an external device.

20. The charging device (1) according to claim 19, wherein The main body part (153) of the housing (15) is configured as a layered structure, and the layered structure includes an inner support layer and a covering layer covering the outside of the support layer. Among them, the support layer is made of a plastic material, and the covering layer is made of a thermoplastic elastomer material.

21. The charging device according to claim 20, wherein The third opening (1531) and the fourth opening (1532) on the third surface are formed in the support layer, and the covering layer is provided with material removal areas around the third opening (1531) and the fourth opening (1532), and Among them, the covering layer is hermetically fixed to the support layer along the edge of the material removal area to form a sealing edge.

22. The charging device (1) according to claim 15, wherein The first circuit board, the second circuit board, and / or the third circuit board are fixed to the housing by screw connections, and among them, the fourth circuit board is fixedly connected to the first circuit board through a bracket (165), and the second circuit board and / or the third circuit board are kept relatively fixed to the first circuit board through a lapping member (168).

23. The charging device (1) according to claim 22, wherein The bracket is provided with a sliding part (1654) for cooperating with a slide rail provided on the inner wall of the housing to guide the control component into the housing.

24. The charging device (1) according to claim 13, wherein The first battery pack engaging part (11) and the second battery pack engaging part (12) are provided with snap receiving parts (113) for cooperating with corresponding snap parts (213) provided on the first battery pack and the second battery pack to fixedly mechanically connect the battery pack to the charging device.

25. The charging device (1) according to claim 1, wherein If the remaining power of the first battery pack is higher than that of the second battery pack, the current value allocated to the first battery pack is lower than the current value allocated to the second battery pack; and If the remaining power of the first battery pack is equal to that of the second battery pack, the current value allocated to the first battery pack is equal to the current value allocated to the second battery pack.

26. The charging device (1) according to claim 1, characterized in that, When the charging device (1) is not electrically connected to the power grid and the first battery pack and / or the second battery pack are electrically connected to the charging device, the charging device is configured to be able to automatically wake up and provide power to the external device when the external device is electrically connected to the charging device.

27. A charging system, characterized in that, The charging system includes: The charging device (1) according to any one of claims 1-26; and At least one of an external device, an external adapter, and a plurality of battery packs (2) capable of being mechanically and electrically connected to the charging device.

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