Battery interface device, plug-in battery equipment, and combination and management method thereof

Abstract

The present application provides a battery interface device, a plug-in battery device, and a combination and management method thereof. The battery interface device includes a housing, an upper battery interface, a first communication interface, and a second communication interface disposed on the upper surface of the housing, and a lower battery interface, a third communication interface, and a fourth communication interface disposed on the lower surface of the housing, wherein the upper battery interface, the first communication interface, and the second communication interface respectively have the same projection position and different and mutually compatible interface forms as the lower battery interface, the third communication interface, and the fourth communication interface; a first signal line is connected between the first communication interface and the fourth communication interface; a second signal line is connected between the second communication interface and the third communication interface; and a main control unit includes an acquisition module, a control module, and a first pin and a second pin respectively connected to the first signal line and the second signal line. The technical solution of the present application can realize the orderly control of the charging and discharging of two plug-in batteries.

Description

Technical Field

[0001] The present application relates to battery control technology, and in particular, to a battery interface device, a plug-in battery device using the interface device, a combination thereof, and a management method for the combination. Background Art

[0002] In some applications requiring high capacity or long battery life (such as powering underwater propulsion systems or drones), the use of two plug-in batteries to form a larger power supply unit can effectively increase the power supply capacity of electric devices and provide greater flexibility and efficiency. Obviously, for a power supply unit composed of two plug-in batteries, it is necessary to obtain the power information of each battery in a timely manner to achieve balanced charging and discharging, and avoid plug-in safety issues caused by excessive battery power differences (such as sparks).

[0003] The existing solutions for collecting power information of two batteries (or more batteries) all require the use of a data bus to transmit signals to an external battery management system (BMS). For example, in patent US20230055483A1, each battery uses RS485 data to transmit data to the outside world, and the data is transmitted to a loading module outside the battery and read by the battery pack controller in the loading module. Since each battery uses the same data bus, a serial method is required, and the module controller of each battery schedules the data transmission sequence.

[0004] However, when using a two-cell plug-in battery solution, it is desirable to provide a simpler and more convenient solution that does not require an additional signal scheduling or signal timing processing module and can obtain battery power information and perform charge and discharge management using only the two battery devices themselves. Summary of the Invention

[0005] An embodiment of the present application provides a battery interface device, comprising: a shell having a space for accommodating a battery therein; an upper battery interface, a first communication interface, and a second communication interface arranged on the upper surface of the shell, and a lower battery interface, a third communication interface, and a fourth communication interface arranged on the lower surface of the shell, wherein the upper battery interface, the first communication interface, and the second communication interface respectively have the same projection position and different and mutually compatible interface forms as the lower battery interface, the third communication interface, and the fourth communication interface; a first signal line connected between the first communication interface and the fourth communication interface; a second signal line connected between the second communication interface and the third communication interface; a main control unit, comprising a collection module for collecting the power of the battery, a control module for controlling the charging and discharging of the battery, and a first pin and a second pin respectively connected to the first signal line and the second signal line.

[0006] Preferably, the first signal line and the second signal line can transmit different data in parallel.

[0007] An embodiment of the present application also provides a plug-in battery device, including the aforementioned battery interface device, and a battery housed inside the battery interface device; the electrodes of the battery are electrically connected to the upper battery interface and the lower battery interface respectively; the main control unit sends the battery power information through the first pin or the second pin.

[0008] Furthermore, the upper battery interface includes a first positive electrode interface and a first negative electrode interface; the lower battery interface includes a second positive electrode interface and a second negative electrode interface; the first positive electrode interface and the second positive electrode interface are connected to the positive electrode of the battery, and the first negative electrode interface and the second negative electrode interface are connected to the negative electrode of the battery.

[0009] Preferably, the main control unit of the plug-in battery device further includes a display module for displaying the battery power level.

[0010] Optionally, the plug-in battery device can be used alone, or plugged in with another plug-in battery device for use.

[0011] Furthermore, when one of the plug-in battery devices is used alone, the control module of the plug-in battery device controls the charge and discharge status of the plug-in battery device based on the power information of the battery inside it; when one of the plug-in battery devices is plugged in and used with another plug-in battery device, the control module of the plug-in battery device controls the charge and discharge status of the plug-in battery device based on the power information of the battery inside it and the power information of the battery inside the other plug-in battery device.

[0012] An embodiment of the present application also provides a combination of plug-in battery devices, including two plug-in battery devices, wherein the battery devices are the aforementioned plug-in battery devices; the upper battery interface, first communication interface, and second communication interface of the battery device plugged in below are respectively plugged in with the lower battery interface, third communication interface, and fourth communication interface of the battery device plugged in above.

[0013] Preferably, the first signal line and the second signal line in each of the battery devices can respectively transmit the power information of the battery inside it and the power information of the battery inside another of the battery devices in parallel; or, the second signal line and the first signal line in each of the battery devices can respectively transmit the power information of the battery inside it and the power information of the battery inside another of the battery devices in parallel.

[0014] The present application further provides a management method through an embodiment for managing the charging and discharging of the aforementioned combination of plug-in battery devices, the management method comprising the following operations:

[0015] The main control units of the two battery devices respectively obtain the power information of their respective batteries;

[0016] The main control units of the two battery devices send the power information of their own batteries through their respective first signal lines and receive the power information of the battery of the other battery device through their respective second signal lines. Alternatively, the main control units of the two battery devices send the power information of their own batteries through their respective second signal lines and receive the power information of the battery of the other battery device through their respective first signal lines.

[0017] The control modules of the two battery devices obtain the charge and discharge status of their respective batteries through the acquired battery power information of the two battery devices.

[0018] Preferably, the management method further comprises the following steps: displaying the power information of the two battery devices respectively.

[0019] The battery interface device provided in the embodiment of the present application cross-connects the communication interfaces corresponding to the positions on the upper and lower surfaces. Through this wiring method, various main control units of the two battery devices can obtain the power status of themselves and the other battery device. On this basis, the charging and discharging strategy of their own battery can be determined according to the power status of themselves and the other battery device, avoiding the problem of using two interface devices with different internal structures to obtain information of two batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of an existing underwater propeller;

[0021] Figure 2 A schematic diagram of the appearance of a plug-in battery device provided according to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the appearance of a plug-in battery device provided according to an embodiment of the present application;

[0023] Figure 4 A top view of a plug-in battery device provided according to an embodiment of the present application;

[0024] Figure 5 A bottom view of a plug-in battery device provided according to an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a combination of plug-in battery devices provided according to an embodiment of the present application;

[0026] Figure 7 A schematic diagram of power information transmission of a battery combination;

[0027] Figure 8 A schematic diagram of power information transmission of a battery combination;

[0028] Figure 9 A schematic diagram of the internal wiring of a plug-in battery device provided according to an embodiment of the present application;

[0029] Figure 10 A wiring diagram of a combination of plug-in battery devices provided according to an embodiment of the present application;

[0030] Figure 11 A wiring diagram of a combination of plug-in battery devices provided according to an embodiment of the present application;

[0031] Figure 12 A schematic diagram of the internal wiring of a plug-in battery device provided according to an embodiment of the present application;

[0032] Figure 13 This is a wiring diagram of a combination of plug-in battery devices provided according to an embodiment of the present application.

[0033] Numbers in the figure

[0034] Battery interface device 1, upper surface 11, lower surface 12, side surface 13, screw hole 14, slide rail 15, main control unit 2, first pin 201, second pin 202, acquisition module 21, control module 22, display module 23, battery 3, upper battery interface 4, first positive electrode interface 41, first negative electrode interface 42, lower battery interface 5, second positive electrode interface 51, second negative electrode interface 52, first communication interface 61, first connector 611, second communication interface 62, second connector 621, third communication interface 63, fourth communication interface 64, first signal line 71, second signal line 72, plug-in battery device 800, first plug-in battery device 800-1, second plug-in battery device 800-2, first battery device 810, second battery device 820, underwater thruster 900, thruster housing 901, operation control unit 902, propeller 903, fairing 904, guard plate 905. DETAILED DESCRIPTION

[0035] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0036] In addition, various components in the drawings are enlarged or reduced in size for ease of understanding, but this is not intended to limit the scope of protection of this application.

[0037] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, words such as first and second are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance. Their names may be different in the detailed description and claims of the present application.

[0038] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0039] Figure 1 An underwater propeller 900 is shown, which can be hand-held and controlled by a user for underwater movement. Sensors, batteries, motors and other components are installed inside the propeller housing 901. The operation control unit 902 is located outside the propeller housing 901. The direction of the propeller can be controlled by operating the handle, and the switch and speed of the propeller 903 driven by the motor can be controlled by infrared remote control. The deflector 904 is placed on the outside of the propeller 903 and is provided with a protective plate 905.

[0040] To ensure sufficient power for an acceptable period of time (e.g., half an hour or longer), the battery capacity of the underwater propulsion device 900 needs to be greater than 200Wh. Generally, the battery is rechargeable and has a control module for monitoring the battery's charge level and other status, as well as controlling the charging and discharging process.

[0041] Figure 1 The underwater thruster 900 shown provides a typical application scenario of such a large-capacity rechargeable battery, but it is obvious that the large-capacity rechargeable battery can also be used in other electrical devices, such as drones, unmanned vehicles or robots.

[0042] While increasing the capacity of a single battery can extend the battery life, it also brings additional inconveniences, particularly in certain situations, such as on airplanes, where the capacity of a single battery may be limited and carry-on. In such cases, two pluggable batteries with capacities that meet the required limits can be used to meet these requirements. Furthermore, these pluggable batteries can be used independently, for example to power smaller underwater propellers, thus increasing the convenience of battery use.

[0043] To this end, some embodiments of the present application provide a plug-in battery device, which can power an electrical device independently or by plugging two plug-in battery devices together to power the electrical device.

[0044] In some embodiments, the plug-in battery device is composed of a battery and an external battery interface device. Figure 2 、 Figure 3 They are respectively three-dimensional schematic diagrams of the upper surface side and the lower surface side of the battery interface device 1 provided according to some preferred embodiments of the present application, Figure 4 、 Figure 5 The top view and the bottom view of the battery interface device 1 are shown respectively. Obviously, when the battery is installed inside the battery interface device 1 and the battery is correctly connected to the battery interface device 1, a plug-in battery device 800 is formed.

[0045] Two plug-in battery devices 800 can provide a larger battery capacity by plugging into each other, for example, Figure 6 A combination of two plug-in battery devices 800 is shown.

[0046] Obviously, the shape and size of the plug-in battery device 800 are roughly determined by its battery interface device 1, such as Figures 3 to 5 As shown, the battery interface device 1 has a shell formed by two mutually parallel upper surfaces 11 and lower surfaces 12, and a side surface 13 connected between the upper surface 11 and the lower surface 12. A space is formed inside the shell for accommodating the battery and the main control unit and wiring described later. The manufacturing material of the shell can be selected according to the use scenario. For example, it can be made of a material with insulation, wear resistance, heat insulation, waterproof and other properties. The shape of the upper surface 11 and the lower surface 12 can be Figures 3 to 5 The circle shown is, in other embodiments, other shapes such as ellipse, rectangle, polygon, etc. may also be used depending on the conditions of use.

[0047] In some embodiments, as Figures 2 to 5As shown, a plurality of screw holes for installation are provided on the upper and lower surfaces of the shell, and the upper surface 11, the lower surface 12 and the side surface can be assembled by means of bolts that cooperate therewith. In addition, the assembly of the shell can also be achieved by other methods known to those skilled in the art.

[0048] In some embodiments, a protruding slide rail 15 is provided on the side surface 13 of the housing. The slide rail 15 can cooperate with the slide groove on the inner wall of the aforementioned thruster housing 901 to limit its axial movement to facilitate alignment of the two battery interface devices 1 when plugged in.

[0049] Furthermore, if Figures 3 to 5 As shown, corresponding battery interfaces and communication interfaces are provided on the upper surface 11 and the lower surface 12. Obviously, the corresponding interfaces on the upper surface 11 and the lower surface 12 have the same projected position on the upper surface 11 (or the lower surface 12). At the same time, the interface on the upper surface 11 and the interface on the lower surface 12 should adopt different interface forms that can adapt to each other. For example, if the battery interface on the upper surface 11 is a male connector, then the battery interface on the lower surface 12 should be a matching female connector. Or vice versa, if the battery interface on the upper surface 11 is a female connector, then the battery interface on the lower surface 12 should be a matching male connector. The same setting method is also used for the communication interface. Through this setting method, it can be ensured that the two battery interface devices 1 can be plugged into each other.

[0050] When two plug-in battery devices 800 are plugged in for use, if the difference in power between the two is too large, it will not only be detrimental to stable power supply, but may also generate electric sparks during the plug-in process, affecting the safety of equipment power use. Therefore, the plug-in battery device 800 needs to be controlled by the main control unit for charging and discharging. Obviously, the control of charging and discharging should be determined comprehensively based on the power status of each plug-in battery device 800 itself and the power status of the other plug-in battery device 800 plugged in with it.

[0051] The applicant has found that not all communication forms can conveniently and reasonably realize the communication of power information between two battery devices. For example, Figure 7 The figure shows a communication connection method for two first battery devices 810. Since the power information of each battery is transmitted via the same signal line, when the two are plugged in, the line transmitting the power information will be blocked, resulting in the line where the first connector 611 is located containing the power information of both first battery devices 810, while the second connector 621 is idle. To solve this problem, it is necessary to use a serial data bus with an additional processing module for serial data transmission and management, as described in the patent US20230055483A1 mentioned in the background technology.

[0052] Figure 8Another communication connection mode between the first battery device 810 and the second battery device 820 is shown. Figure 8 As shown, although this signal transmission method can transmit the power information of two battery devices through two signal lines respectively, the different connection methods require the provision of two interface devices, which will undoubtedly increase the manufacturing cost.

[0053] Therefore, in order to realize the plug-in use and communication of power information of two plug-in battery devices 800 of the same structure, the wiring method inside the battery interface device 1 must be reasonably set.

[0054] Figure 9 The internal wiring diagram of the plug-in battery device 800 provided in accordance with some embodiments of the present application is shown below. Figure 9 as well as Figures 3 to 5 The battery interface device 1 of the battery plug-in device 800 and its connection method with the internal battery 3 are described.

[0055] As shown in the figure, the interfaces set on the surface of the battery interface device 1 include an upper battery interface 4, a first communication interface 61, and a second communication interface 62 set on the upper surface 11 of the shell, and a lower battery interface 5 and a third communication interface 63 and a fourth communication interface 64 set on the lower surface 12 of the shell.

[0056] The upper battery interface 4 further includes a first positive interface 41 and a first negative interface 42, which are connected to the positive and negative poles of the battery 3, respectively. Correspondingly, the lower battery interface 5 further includes a second positive interface 51 and a second negative interface 52, which are connected to the positive and negative poles of the battery 3, respectively. The first positive interface 41 and the second positive interface 51 are projected at the same position and use different but mutually compatible interface forms, that is, the two interfaces can ensure that they can be plugged into each other. Similarly, the first negative interface 42 and the second negative interface 52 are projected at the same position and the two interface forms can ensure that they can be plugged into each other.

[0057] The first communication interface 61 and the third communication interface 63 have the same projection position and adopt different and mutually compatible interface forms, that is, the interfaces of the two can ensure that they can be plugged into each other. Similarly, the second communication interface 62 and the fourth communication interface 64 have the same projection position, and the interfaces of the two can ensure that they can be plugged into each other.

[0058] Furthermore, in addition to the battery 3 , the battery interface device 1 also includes a first signal line 71 , a second signal line 72 and a main control unit 2 .

[0059] Among them, the first signal line 71 is connected between the first communication interface 61 and the fourth communication interface 64; the second signal line 72 is connected between the second communication interface 62 and the third communication interface 63, thereby forming a communication mode in which the communication interface on the upper surface 11 and the communication interface with different projection positions on the lower surface 12 are cross-connected.

[0060] In the embodiments of the present application, the materials for manufacturing the first signal line 71 and the second signal line 72 are not limited. For example, UL2464 shielded wire, RVV signal wire, 2547 shielded wire, and other types of wires capable of data transmission can be used as the first signal line 71 and the second signal line 72.

[0061] Obviously, through the above-mentioned cross-connection communication method, the first signal line and the second signal line can transmit different data in parallel. When two battery devices are plugged in and used, this communication method will not require additional serial data processing, which can effectively simplify the complexity of the interface and reduce manufacturing costs.

[0062] The main control unit 2 further includes a collection module 21, a control module 22, and a first pin 201 and a second pin 202. The collection module 21 is used to collect information about the battery 3's power level, while the control module 22 is used to control the charging and discharging process of the battery 3. Techniques for testing and controlling battery power levels and the charging and discharging process are well known to those skilled in the art. Therefore, the collection module 21 and control module 22 can be implemented using various known chips, circuits, etc. for power collection and control.

[0063] Furthermore, the first pin 201 is connected to the first signal line, that is, it can transmit data with the first communication interface 61 and the fourth communication interface 64, and the second pin 202 is connected to the second signal line 72, that is, it can transmit data with the second communication interface 62 and the third communication interface 63.

[0064] exist Figure 9 In the embodiment shown, the power information of the battery 3 collected by the collection module 21 is also transmitted to the second pin 202, that is, when the battery 3 is installed inside the battery interface device 1 and according to Figure 9 After connection is performed in the manner shown, the second communication interface 62 and the third communication interface 63 of the plug-in battery device will contain the power information of the battery 3 .

[0065] Figure 10 FIG. 1 shows a wiring diagram of a combination formed by plugging two plug-in battery devices into each other in some embodiments, as shown in FIG. Figure 10As shown, the combination includes two battery devices connected. For ease of description, the upper battery device is named the first battery device 800-1, and the battery device connected to the lower battery device is named the second battery device 800-2. The interiors of these two battery devices are both Figure 9 Wiring method shown.

[0066] When the two are plugged in, the first battery device 800-1 obtains its own power information through its acquisition module 21 and transmits it to the second signal line 72 through the second pin 202. The power information is then transmitted to the first communication interface 61 of the second battery device 800-2 through its third communication interface 63. The first signal line 71 of the second battery device 800-2 further transmits the power information of the first battery device 800-1 to the first pin 201 of the main control unit 2 of the second battery device 800-2, so that the main control unit 2 of the second battery device 800-2 can obtain the power information of the battery 3 of the first battery device 800-1.

[0067] Correspondingly, the second battery device 800-2 obtains its own power information through its acquisition module 21, and transmits it to its second signal line 72 through the second pin 202, and then transmits the power information to the fourth communication interface 64 of the first battery device 800-1 through its second communication interface 62. The first signal line 71 of the first battery device 800-1 further transmits the power information of the second battery device 800-2 to the first pin 201 of the main control unit 2 of the first battery device 800-1, so that the main control unit 2 of the first battery device 800-1 can obtain the power information of the battery 3 of the second battery device 800-2.

[0068] Through this wiring method, the various main control units 2 of the two battery devices can simultaneously obtain the power status of themselves and the other battery device. On this basis, they can determine the charging and discharging strategy of their own battery 3 according to the power status of themselves and the other battery device, and control the charging and discharging of battery 3 through the control module 22.

[0069] Obviously, the plug-in battery device 800 manufactured by using the battery interface device 1 can be Figure 9 Used alone as shown, or as Figure 10 The plug-in shown forms a combined use of plug-in battery devices, and no matter what plug-in order the two plug-in battery devices use, it can ensure that the respective main control units 2 can obtain the power information of the two battery devices to balance the charge and discharge process.

[0070] At the same time, as analyzed above, since the second signal line and the first signal line in the two battery devices can transmit the power information of the batteries inside them and the power information of the batteries inside the other battery device in parallel at the same time, there is no need to add an additional module for controlling serial data transmission, which can effectively reduce the complexity of the interface and the manufacturing cost.

[0071] In addition, this cross-wiring method has additional advantages. For example, in some preferred embodiments, the combination of plug-in battery devices is also connected to an additional integrated battery management unit and is controlled by the integrated battery management unit. Obviously, when two battery devices are plugged in, the integrated management unit needs to obtain the power information of the two battery devices at the same time through the communication interface of one of the battery devices.

[0072] Figure 11 In the embodiment shown, the plugging order of the first battery device 800-1 and the second battery device 800-2 is the same as Figure 10 On the contrary, however, according to the connection method of the two battery devices, it can be known that Figure 10 、 Figure 11 Regardless of the plug-in mode, the first communication interface 61 and the second communication interface 62 of the upper battery device always display the power information of the lower and upper battery devices respectively. The corresponding relationship between the above communication interface and the power does not change with the change of the plug-in mode of the two battery devices. The integrated management unit can determine which battery device the power information comes from only based on the interface position without the need for other auxiliary information.

[0073] In addition to using the second signal line 72 to obtain the power information of its battery 3, the main control unit 2 of the plug-in battery device 800 can also use the second signal line 72 to obtain the power information of its battery 3. Figure 12 As shown, the first signal line 71 is used to obtain the power information of the battery 3. Figure 13 The figure shows the internal wiring of two plug-in battery devices 800 after plugging in when this wiring method is used. Figure 13 In the embodiment shown, the main control unit in each battery device obtains the power information of its own battery 3 through the first signal line 71 and obtains the power information of the battery 3 of another battery device through the second signal line 72. At the same time, the power information transmitted by each communication interface also changes accordingly. Figure 10 and Figure 11 It is easy to know that under this wiring mode, the first signal line and the second signal line in each battery device can respectively transmit the power information of the battery inside the battery device and the power information of the battery inside another battery device in parallel.

[0074] In some preferred embodiments, Figure 3As shown, the main control unit 2 of the plug-in battery device 800 further includes a display module 23. The display module 23 can use a liquid crystal screen or a digital tube to intuitively display the battery 3 power information acquired by the acquisition module. The implementation method of using a display module to display battery power information is well known to those skilled in the art and will not be described in detail here.

[0075] Some preferred embodiments of the present application also provide a management method for Figure 10 、 Figure 11 or Figure 13 The method for managing charging and discharging of a combination of plug-in battery devices includes the following operations:

[0076] A1, the main control units of the two battery devices respectively obtain the power information of their respective batteries;

[0077] A2, the main control units of the two battery devices send the power information of their own batteries through their respective first signal lines and receive the power information of the battery of the other battery device through their respective second signal lines, or the main control units of the two battery devices send the power information of their own batteries through their respective second signal lines and receive the power information of the battery of the other battery device through their respective first signal lines;

[0078] A3, the control modules of the two battery devices obtain the charge and discharge status of their respective batteries through the acquired battery power information of the two battery devices.

[0079] In some preferred embodiments, the management method further comprises the following steps: displaying the power information of the two battery devices respectively.

[0080] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery interface device, characterized in that: include: a housing having a space for accommodating a battery; an upper battery interface, a first communication interface, and a second communication interface disposed on the upper surface of the housing, and a lower battery interface, a third communication interface, and a fourth communication interface disposed on the lower surface of the housing, wherein the upper battery interface, the first communication interface, and the second communication interface have the same projection position and different but mutually compatible interface forms as the lower battery interface, the third communication interface, and the fourth communication interface, respectively; A first signal line connected between the first communication interface and the fourth communication interface; A second signal line is connected between the second communication interface and the third communication interface; The main control unit includes a collection module for collecting the power of the battery, a control module for controlling the charge and discharge of the battery, and a first pin and a second pin respectively connected to the first signal line and the second signal line.

2. The battery interface device according to claim 1, characterized in that: The first signal line and the second signal line can transmit different data in parallel.

3. A plug-in battery device, characterized in that: Comprising the battery interface device according to claim 1 or 2, and a battery accommodated inside the battery interface device; The electrodes of the battery are electrically connected to the upper battery interface and the lower battery interface respectively; The main control unit sends the battery power information through the first pin or the second pin.

4. The plug-in battery device according to claim 3, characterized in that: The upper battery interface includes a first positive electrode interface and a first negative electrode interface; The lower battery interface includes a second positive electrode interface and a second negative electrode interface; The first positive electrode interface and the second positive electrode interface are connected to the positive electrode of the battery, and the first negative electrode interface and the second negative electrode interface are connected to the negative electrode of the battery.

5. The plug-in battery device according to claim 3, characterized in that: The main control unit also includes a display module for displaying the power level of the battery.

6. The plug-in battery device according to claim 3, characterized in that: The plug-in battery device can be used alone or connected with another plug-in battery device for use.

7. The plug-in battery device according to claim 6, characterized in that: When one of the plug-in battery devices is used alone, the control module of the plug-in battery device controls the charge and discharge state of the plug-in battery device based on the power information of the battery inside the plug-in battery device; When one plug-in battery device is plugged in and used with another plug-in battery device, the control module of the plug-in battery device controls the charge and discharge state of the plug-in battery device based on the power information of its internal battery and the power information of the battery inside the other plug-in battery device.

8. A combination of plug-in battery devices, comprising two plug-in battery devices, characterized in that: The battery device is a plug-in battery device according to any one of claims 3 to 7; The upper battery interface, the first communication interface and the second communication interface of the battery device plugged in the lower part are plugged in with the lower battery interface, the third communication interface and the fourth communication interface of the battery device plugged in the upper part respectively.

9. The combination of plug-in battery devices according to claim 8, characterized in that: The first signal line and the second signal line in each battery device can respectively transmit the power level information of the battery therein and the power level information of the battery in another battery device in parallel.

10. A management method for managing the charging and discharging of the combination of plug-in battery devices according to claim 8 or 9, characterized in that: The following operations are included: The main control units of the two battery devices respectively obtain the power information of their respective batteries; The main control units of the two battery devices send the power information of their own batteries through their respective first signal lines and receive the power information of the battery of the other battery device through their respective second signal lines. Alternatively, the main control units of the two battery devices send the power information of their own batteries through their respective second signal lines and receive the power information of the battery of the other battery device through their respective first signal lines. The control modules of the two battery devices control the charge and discharge status of their respective batteries according to the acquired power information of the batteries of the two battery devices.

11. The management method according to claim 10, characterized in that: The following steps are also included: The power information of the two battery devices is displayed respectively.

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