Discharge System

Abstract

To provide a discharge system capable of suppressing unnecessary consumption of the power stored in a battery.SOLUTION: A discharge system 10 includes a battery pack 20 and a discharge unit 30. The battery pack 20 includes: a battery 22; a terminal unit 28 connected to the discharge unit 30; and a switch unit 23 operated by a user. The discharge unit 30 has an output unit 36 that is controlled the output is turned on and off by operating the switch section 23, and which is an output unit 36 that outputs the power stored in battery 22 obtained via terminal unit 28.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a discharge system that utilizes a battery pack. [Background technology]

[0002] Patent Document 1 discloses a battery system including a battery pack and a charging device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 006152 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a discharge system that can suppress unnecessary consumption of power stored in a storage battery. [Means for solving the problem]

[0005] A discharge system according to one embodiment of the present invention comprises a storage battery pack and a discharge device, wherein the storage battery pack has a storage battery, a terminal unit connected to the discharge device, and a switch unit operated by a user, and the discharge device has an output unit that outputs the power stored in the storage battery obtained via the terminal unit, and the on / off of the output is controlled by the operation of the switch unit. [Effects of the Invention]

[0006] The discharge system of the present invention can reduce unnecessary consumption of power stored in the storage battery. [Brief explanation of the drawings]

[0007] [Figure 1]FIG. 1 is a block diagram showing a functional configuration of a discharge system according to the first embodiment. [Figure 2] FIG. 2 is a first external view of the discharge system according to the first embodiment as viewed from above. [Figure 3] FIG. 3 is a second external view of the discharge system according to the first embodiment, seen from above. [Figure 4] FIG. 4 is a first external view of the discharge system according to the first embodiment, viewed from below. [Figure 5] FIG. 5 is a second external view of the discharge system according to the first embodiment, viewed from below. [Figure 6] FIG. 6 is an external view showing an example of use of the discharge system according to the first embodiment. [Figure 7] FIG. 7 is a sequence diagram of the operation of the discharge system according to the first embodiment. [Figure 8] FIG. 8 is an external view of a discharge device according to a modification of the first embodiment. [Figure 9] FIG. 9 is a first external view of the lighting system according to the second embodiment as viewed from above. [Figure 10] FIG. 10 is a second external view of the lighting system according to the second embodiment as viewed from above. [Figure 11] FIG. 11 is an external view of the lighting system according to the second embodiment as viewed from below. [Figure 12] FIG. 12 is a first external view of the speaker system according to the third embodiment, seen from above. [Figure 13] FIG. 13 is a second external view of the speaker system according to the third embodiment, seen from above. [Figure 14] FIG. 14 is an external view of the speaker system according to the third embodiment as viewed from below. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0009] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0010] (Embodiment 1) [composition] First, the configuration of the discharge system according to the first embodiment will be described. Fig. 1 is a block diagram showing the functional configuration of the discharge system according to the first embodiment. Fig. 2 is an external view of the discharge system according to the first embodiment, seen from above. Fig. 3 is an external view of the discharge system according to the first embodiment, seen from above, in a state where the battery pack and the discharge device are separated. Fig. 4 is an external view of the discharge system according to the first embodiment, seen from below. Fig. 5 is an external view of the discharge system according to the first embodiment, seen from below, in a state where the battery pack and the discharge device are separated.

[0011] 1 to 5, the discharge system 10 includes a storage battery pack 20 and a discharge device 30 to which the storage battery pack 20 is detachably connected. A user can use the discharge system 10 as a power source for a device by connecting the device to an output unit 36 ​​included in the discharge device 30. FIG. 6 is an external view of the discharge system 10 when used as a power source for charging a smartphone.

[0012] First, we will explain the storage battery pack 20. The storage battery pack 20 functions as a power source for the discharge device 30. The storage battery pack 20 has a main body 21, a storage battery 22, a switch 23, a display 24, a measurement circuit 25, a control unit 26, a memory unit 27, and a terminal unit 28.

[0013] The main body 21 is a housing that houses the storage battery 22, the control unit 26, and the storage unit 27. The main body 21 has a generally rectangular parallelepiped shape that is long in the height direction. The corners of the top surface of the main body 21 and the corners of the side surfaces of the main body 21 are rounded. The four side surfaces of the main body 21 have a symmetrical appearance. The main body 21 is formed, for example, from an insulating resin material. As shown in Figures 3 and 4, a switch unit 23 and a display unit 24 are provided on the top of the main body 21. Furthermore, as shown in Figure 5, a terminal unit 28 is provided on the bottom (lower surface) of the main body 21.

[0014] The storage battery 22 is a secondary battery that can be repeatedly charged and discharged, and is realized by, for example, a lithium ion battery.

[0015] The switch unit 23 is a push button switch that is operated by the user. When the switch unit 23 is operated (specifically, pressed) by the user, the control unit 26 causes the display unit 24 to display the remaining charge of the storage battery 22. The switch unit 23 is not limited to a push button switch, and may be a slide switch, a rocker switch, or the like.

[0016] The display unit 24 displays the remaining charge of the storage battery. The display unit 24 is realized, for example, by a plurality of light-emitting elements, and displays the remaining charge of the storage battery 22 by the number of light-emitting elements that are lit. The light-emitting elements are, for example, LED (Light Emitting Diode) elements, but may also be organic EL (Electro-Luminescence) elements. The display unit 24 may also be realized by a display panel such as a liquid crystal panel or an organic EL panel.

[0017] The measurement circuit 25 measures the remaining capacity of the storage battery 22. The measurement circuit 25 is, for example, a voltage measurement type measurement circuit (integrated circuit) that measures the terminal voltage of the storage battery 22, but may also be a measurement circuit of another type such as a coulomb counter type.

[0018] Based on the operation of switch unit 23, control unit 26 causes display unit 24 to display the remaining charge of storage battery 22 measured by measurement circuit 25. Control unit 26 is specifically realized by a microcomputer or a processor. The functions of control unit 26 are realized, for example, by the microcomputer or processor constituting control unit 26 executing a computer program stored in memory unit 27.

[0019] The storage unit 27 is a storage device that stores the computer program. The storage unit 27 is realized by, for example, a semiconductor memory. The storage unit 27 may be built into the control unit 26.

[0020] The terminal portion 28 has a terminal structure for electrically connecting the storage battery pack 20 to the discharge device 30, and specifically, is electrically and structurally connected to a terminal portion 32 of the discharge device 30. The terminal portion 28 has a plurality of terminals. The plurality of terminals includes a communication terminal 28a that enables the storage battery pack 20 (controller 26) to communicate with the discharge device 30 (discharge controller 34), and a power transmission terminal 28b that enables the storage battery pack 20 to transmit power stored in the storage battery 22 to the discharge device 30.

[0021] Next, the discharge device 30 will be described. 0 is , which operates using the storage battery pack 20 as a power source. The discharge device 30 has a main body 31, a terminal unit 32, a power conversion circuit 33, a discharge control unit 34, a memory unit 35, and a plurality of output units 36 (only one is shown in FIG. 1). The discharge device 30 can also be called a discharger.

[0022] The main body 31 is a housing that houses a discharge control unit 34 and a memory unit 35. The main body 31 is roughly rectangular parallelepiped, with rounded corners on the sides. The four sides of the main body 31, including the side not shown in the drawing, have the same appearance. The main body 31 is formed, for example, from an insulating resin material. A terminal unit 32 is provided on the top (top surface) of the main body 31. An output unit 36 ​​is provided on the side (side surface) of the main body 31.

[0023] The terminal unit 32 has a terminal structure for electrically connecting the discharge device 30 to the storage battery pack 20, and specifically, is electrically and structurally connected to the terminal unit 28 of the storage battery pack 20. The terminal unit 32 has a plurality of terminals. The plurality of terminals includes a communication terminal 32a and a power receiving terminal 32b. The communication terminal 32a is electrically connected to the communication terminal 28a of the storage battery pack 20, and the power receiving terminal 32b is electrically connected to the power transmitting terminal 28b of the storage battery pack 20.

[0024] The power conversion circuit 33 obtains the power stored in the storage battery 22 via the power receiving terminal 32b, converts the obtained power into power suitable for the output unit 36, and outputs the converted power to the output unit 36. The power conversion circuit 33 is realized, for example, by a DC (Direct Current)-DC converter circuit that converts the direct current power stored in the storage battery 22 into direct current power suitable for the output unit 36. Note that, as will be described later, in the case where the output unit 36 ​​outputs alternating current power, the power conversion circuit 33 is realized by a DC-AC (Alternating Current) converter circuit that converts the direct current power stored in the storage battery 22 into alternating current power suitable for the output unit 36.

[0025] The discharge control unit 34 controls the on / off of the power conversion circuit 33, that is, the on / off of the power output via the output unit 36. The discharge control unit 34 is specifically realized by a microcomputer or a processor. The functions of the discharge control unit 34 are realized, for example, by the microcomputer or processor constituting the discharge control unit 34 executing a computer program stored in the storage unit 35.

[0026] The storage unit 35 is a storage device that stores the computer program. The storage unit 35 is realized by, for example, a semiconductor memory. The storage unit 35 may be built into the discharge control unit 34.

[0027] The output unit 36 ​​has a terminal structure to which devices (external devices) other than the discharge system 10 are connected. As shown in FIGS. 2 to 6, the output units 36 are provided, for example, two on each of the four side surfaces of the main body 31. The output units 36 output the power stored in the storage battery 22 and converted by the power conversion circuit 33 to the devices connected to the output units 36. The output units 36 are realized, for example, by a USB (Universal Serial Bus) connector. USB connectors include various connectors such as USB Type-A, USB Type-B, USB Type-C, Mini USB Type-B, micro USB Type-B, USB-PD (Power Delivery), and Lightning.

[0028] It is not essential that the output unit 36 ​​be realized by a USB connector. The output unit 36 ​​may be realized by, for example, an RJ-45 connector (a connector to which a so-called LAN (Local Area Network) cable is connected) that complies with the Ethernet (registered trademark) standard. The output unit 36 ​​may also be realized by an AC outlet or a DC outlet. The multiple output units 36 included in the discharge device 30 may all have the same type of terminal structure, or the multiple output units 36 included in the discharge device 30 may include different types of terminal structures (for example, a USB connector and an AC outlet).

[0029] [Operation] Next, a description will be given of the operation of the discharge system 10. FIG.

[0030] With the terminal 28 of the battery pack 20 connected to the terminal 32 of the discharge device 30, the user operates the switch 23 of the battery pack 20. The switch 23 accepts the user's operation (S11), and the control unit 26, upon receipt of the user's operation by the switch 23, causes the display unit 24 to display the remaining charge of the battery 22 (S12). Specifically, the control unit 26 causes some or all of the multiple light-emitting elements included in the display unit 24 to emit light in accordance with the remaining charge of the battery 22 measured by the measurement circuit 25. Note that the display of the remaining charge of the battery 22 is stopped, for example, after a certain time has elapsed since the display began.

[0031] Furthermore, when the switch unit 23 accepts the user's operation in step S11, the control unit 26 transmits a discharge start command to the discharge control unit 34 (S13).

[0032] The discharge control unit 34 receives the discharge start command via the communication terminal 28a and the communication terminal 32a. The discharge control unit 34 starts outputting power from the output unit 36 ​​based on the received discharge start command (S14). Specifically, the discharge control unit 34 turns on the power conversion circuit 33, and the turned-on power conversion circuit 33 converts the power obtained from the storage battery 22 via the power transmission terminal 28b and the power receiving terminal 32b into power suitable for the output unit 36 ​​and outputs the converted power to the output unit 36. As a result, the output of power from the output unit 36 ​​starts.

[0033] Thereafter, the user again operates the switch unit 23 of the storage battery pack 20. The switch unit 23 accepts the user's operation (S15), and upon receipt of the user's operation by the switch unit 23, the control unit 26 causes the display unit 24 to display the remaining charge of the storage battery 22 (S16). The processing in step S16 is the same as the processing in step S12.

[0034] When the switch unit 23 accepts the user's operation in step S15, the control unit 26 transmits a discharge stop command to the discharge control unit 34 (S17).

[0035] The discharge control unit 34 receives the discharge stop command via the communication terminal 28a and the communication terminal 32a. Based on the received discharge stop command, the discharge control unit 34 stops the output of power from the output unit 36 ​​(S18). Specifically, the discharge control unit 34 turns off the power conversion circuit 33, and the turned-off power conversion circuit 33 stops outputting power to the output unit 36. As a result, the output of power from the output unit 36 ​​is stopped.

[0036] As described above, in the discharge system 10, the on / off of the power output from the discharge device 30 is controlled by a user's operation of the switch unit 23 provided in the storage battery pack 20. In such a discharge system 10, power is not output from the output unit 36 ​​unless the switch unit 23 is operated. Therefore, unnecessary consumption of the power stored in the storage battery 22 can be reduced compared to a discharge system in which power is always output from the output unit 36 ​​when the storage battery pack 20 is connected to the discharge device 30. Furthermore, in the discharge system 10, there is no need to provide a switch unit on the discharge device 30 side, so the configuration of the discharge device 30 can be simplified while reducing power consumption.

[0037] The switch unit 23 is also a switch unit for displaying the remaining charge of the storage battery 22. The switch unit 23 is also used to turn on and off the discharge device 30 (i.e., it is used for both purposes), which has the advantage that it is not necessary to provide a separate switch unit for turning on and off the discharge device 30 in the storage battery pack 20. Another advantage is that the user can grasp the remaining charge of the storage battery 22 when turning on and off the discharge device 30.

[0038] It is not essential that the switch unit 23 for displaying the remaining charge of the storage battery 22 is also used to turn the discharge device 30 on and off; a switch unit for another purpose provided in the storage battery pack 20 may be used to turn the discharge device 30 on and off, or the storage battery pack 20 may be provided with a switch unit dedicated to turning the discharge device 30 on and off.

[0039] [Variations] In the discharge device 30, the output section 36 may be detachably attached to the main body section 31. Fig. 8 is an external view of a discharge device according to such a modified example.

[0040] 8, a discharge device 30a according to a modified example includes a main body 31a and an output unit 36a that is detachably attached to a recess provided in the main body 31a. The output unit 36a is provided with two output sections 36. In this case, the output sections 36 are USB connectors, and a power conversion circuit 33 corresponding to the USB connectors is housed inside the output unit 36a.

[0041] In the discharge device 30a, the output unit 36a can be replaced with an output unit 37a. The output unit 37a is provided with an output section 37. In this case, the output section 37 is an AC outlet, and the output unit 37a houses a power conversion circuit 33 compatible with the AC outlet.

[0042] In this way, the discharge device 30a can change the power output mode by replacing the output unit.

[0043] [Effects, etc.] As described above, the discharge system 10 includes the storage battery pack 20 and the discharge device 30. The storage battery pack 20 includes the storage battery 22, the terminal unit 28 connected to the discharge device 30, and the switch unit 23 operated by a user. The discharge device 30 includes an output unit 36 ​​that outputs the power stored in the storage battery 22 obtained via the terminal unit 28, and the on / off state of the output of the output unit 36 ​​is controlled by operating the switch unit 23.

[0044] Such a discharge system 10 can reduce unnecessary consumption of the power stored in the storage battery 22 compared to a discharge system in which power is always output from the output section 36 when the storage battery pack 20 is connected to the discharge device 30.

[0045] Furthermore, for example, the battery pack 20 further includes a display unit 24 that displays the remaining charge of the battery 22 through the above operation.

[0046] The discharge system 10 can control the on / off of the output of power from the output unit 36 ​​based on an operation for displaying the remaining charge of the storage battery 22.

[0047] Furthermore, for example, the output unit 36 ​​includes at least one of a USB connector, a DC terminal, a PD terminal, and an AC outlet.

[0048] Such a discharge system 10 can control the on and off of the output of power from a USB connector or an AC outlet.

[0049] Furthermore, for example, the terminal section 28 includes a terminal 28b for transmitting power from the battery pack 20 to the discharge device 30 and a terminal 28a for communication between the battery pack 20 and the discharge device 30.

[0050] The discharge system 10 as described above can realize on / off control of the output of power from the output unit 36 ​​based on the operation of the switch unit 23 through communication between the battery pack 20 and the discharge device 30 .

[0051] (Embodiment 2) [composition] In the second embodiment, a lighting system using a battery pack 20 will be described. Fig. 9 is an external view of the lighting system according to the second embodiment, as viewed from above. Fig. 10 is an external view of the lighting system, as viewed from above, in a state where the battery pack and the lighting device are separated. Fig. 11 is an external view of the lighting system, as viewed from below, in a state where the battery pack and the lighting device are separated.

[0052] 9 to 11, the lighting system 40 includes a storage battery pack 20 and a lighting device 50 to which the storage battery pack 20 is detachably connected. The lighting device 50 operates using the storage battery pack 20 as a power source, and includes a main body 51, a terminal 52, and a light source 53.

[0053] The main body 51 is a housing that houses the light source 53 inside. The main body 51 is roughly rectangular parallelepiped, and the corners of the side surfaces are rounded. The four side surfaces of the main body 51, including the side surfaces not shown in the drawings, have the same appearance. The main body 51 is formed, for example, from an insulating resin material. The side surfaces of the main body 51 are mainly formed from a light-transmitting material (for example, a transparent material), and the light source 53 is visible from the outside. A terminal portion 52 is provided on the upper portion (top surface) of the main body 51.

[0054] The terminal portion 52 has a terminal structure for electrically connecting the lighting device 50 to the storage battery pack 20, and specifically, is electrically and structurally connected to the terminal portion 28 of the storage battery pack 20. The terminal portion 52 has a structure similar to that of the terminal portion 32 of the discharge device 30. In other words, the terminal portion 52 of the lighting device 50 is common to the terminal portion 32 of the discharge device 30. The terminal portion 52 has multiple terminals, and the multiple terminals include a terminal for communication and a terminal for receiving power. The terminal for communication is electrically connected to the terminal for communication 28a of the storage battery pack 20, and the terminal for receiving power is electrically connected to the terminal for power transmission 28b of the storage battery pack 20.

[0055] The light source unit 53 is realized by a light emitting element such as an LED element or an organic EL element, and emits, for example, white light. More specifically, the white light emitted by the light source unit 53 may be daylight (D), neutral white (N), white (W), warm white (WW), or warm white (L).

[0056] In such a lighting system 40, the lighting device 50 (light source unit 53) is turned on and off by a user operating a switch unit 23 provided in the battery pack 20.

[0057] (Embodiment 3) [composition] In the third embodiment, a speaker system using a storage battery pack 20 will be described. Fig. 12 is an external view of the speaker system according to the third embodiment, seen from above. Fig. 13 is an external view of the speaker system, seen from above, in a state where the storage battery pack and the speaker device are separated. Fig. 14 is an external view of the speaker system, seen from below, in a state where the storage battery pack and the speaker device are separated.

[0058] 12 to 14, the speaker system 60 includes a storage battery pack 20 and a speaker device 70 to which the storage battery pack 20 is detachably connected. The speaker device 70 operates using the storage battery pack 20 as a power source, and includes a main body 71, a terminal unit 72, a speaker unit 73, and an adjustment unit 74.

[0059] The main body 71 is a housing that houses a drive circuit for the speaker 73 and other components inside. The main body 71 is roughly rectangular, with rounded corners on the side surfaces. The main body 71 is formed, for example, from an insulating resin material. A terminal section 72 is provided on the top (upper surface) of the main body 71. A speaker section 73 is provided on the front surface of the main body 71, and an adjustment section 74 is provided on the side surface of the main body 71.

[0060] The terminal portion 72 has a terminal structure for electrically connecting the speaker device 70 to the storage battery pack 20, and specifically, is electrically and structurally connected to the terminal portion 28 of the storage battery pack 20. The terminal portion 72 has a structure similar to that of the terminal portion 32 of the discharge device 30. In other words, the terminal portion 72 of the speaker device 70 is common to the terminal portion 32 of the discharge device 30. The terminal portion 72 has a plurality of terminals, and the plurality of terminals includes a communication terminal and a power receiving terminal. The communication terminal is electrically connected to the communication terminal 28a of the storage battery pack 20, and the power receiving terminal is electrically connected to the power transmitting terminal 28b of the storage battery pack 20.

[0061] The speaker unit 73 outputs sound. For example, if a radio receiving circuit is built into the main body 71 of the speaker device 70, the speaker unit 73 outputs radio sound. Also, if a wireless communication circuit capable of communicating with an information terminal such as a smartphone is built into the main body 71 of the speaker device 70 (i.e., if the speaker device 70 is a network speaker), the speaker unit 73 outputs the playback sound of music content provided from the information terminal.

[0062] The adjustment unit 74 is a volume adjustment knob for adjusting the volume of the sound output from the speaker unit 73. If the speaker device 70 has a built-in radio receiving circuit, the adjustment unit 74 may be a knob for switching the receiving channel.

[0063] In such a speaker system 60, the speaker device 70 is turned on and off by a user operating a switch unit 23 provided in the battery pack 20.

[0064] (Other embodiments) Although the embodiments have been described above, the present invention is not limited to the above-described embodiments.

[0065] For example, the components of the discharge system described in the above embodiment may be allocated to the battery pack and the discharge device in any manner. For example, part or all of the power conversion circuit of the discharge device may be provided in the battery pack.

[0066] In the above-described embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of multiple processing operations may be changed, or multiple processing operations may be performed in parallel.

[0067] In the above-described embodiments, each component may be realized by executing a software program suitable for that component, or by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0068] Furthermore, each component may be realized by hardware. Each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or each may be a separate circuit. Furthermore, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0069] Furthermore, the general or specific aspects of the present invention may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0070] For example, the present invention may be realized as the discharge device of the above-described embodiment. The present invention may also be realized as a control method for the discharge system of the above-described embodiment. The present invention may also be realized as a program for causing a computer to execute such a control method, or as a computer-readable non-transitory recording medium on which such a program is recorded.

[0071] In addition, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the present invention. [Explanation of symbols]

[0072] 10 Discharge System 20 Battery pack 21 Main body 22 Storage battery 23 Switch section 24 Display 25 Measurement circuit 26 Control Unit 27, 35 Storage section 28, 32, 52, 72 terminal section 28a, 32a Communication terminals 28b Power transmission terminal 30, 30a discharge device 31, 31a, 51, 71 Main body 32b Power receiving terminal 33 Power Conversion Circuit 34 Discharge control unit 36, 37 Output section 36a, 37a output unit 40 Lighting System 50 Lighting equipment 53 Light source section 60 speaker system 70 Speaker device 73 Speaker section 74 Adjustment part

Claims

1. A battery pack, a discharge device that is detachably connectable to the storage battery pack and has a power conversion circuit; The battery pack includes: A storage battery and a terminal portion connected to the discharge device; a switch unit operated by a user, the discharge device has an output unit that outputs power obtained through the terminal unit and stored in the storage battery, converted by the power conversion circuit; When the switch unit is operated, the storage battery pack transmits a discharge start command or a discharge stop command to the discharge device; The discharge device that has received the discharge start command or the discharge stop command controls the on / off of the power conversion circuit to control the on / off of the output of the output unit. Discharge system.

2. The battery pack further includes a display unit that displays the remaining capacity of the battery in response to the operation. The discharge system of claim 1 .

3. The output unit includes at least one of a USB (Universal Serial Bus) connector, a DC (Direct Current) terminal, a PD (Power Delivery) terminal, and an AC (Alternating Current) outlet. The discharge system according to claim 1 or 2.

4. The terminal unit includes a terminal for transmitting power from the battery pack to the discharge device and a terminal for communication between the battery pack and the discharge device. The discharge system according to any one of claims 1 to 3.

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