An energy storage and charging device

Abstract

This utility model relates to an energy storage and charging device, comprising: a charging input terminal, a DC / DC conversion unit, at least one energy storage unit, a switching unit corresponding to each energy storage unit, a power distribution unit, and at least one charging output terminal; the charging input terminal is connected to the input terminal of the DC / DC conversion unit; the switching unit is connected to the input terminal, the output terminal, and the energy storage unit of the DC / DC conversion unit, and is used to switch the connection of the energy storage unit to the output terminal of the DC / DC conversion unit when the energy storage unit is in a charging state, or to switch the connection of the energy storage unit to the input terminal when the energy storage unit is in a discharging state; the power distribution unit is connected to the output terminal and the charging output terminal of the DC / DC conversion unit, and is used to distribute the output power of the DC / DC conversion unit to the charging output terminal when there is a power demand at the charging output terminal. This utility model reduces the use of DC / DC modules while ensuring power capacity, thereby reducing product cost and size.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and more specifically, to an energy storage charging device. Background Technology

[0002] The use of new energy vehicles is becoming increasingly widespread, leading to a surge in charging demand. To address this charging challenge, more and more charging scenarios are being deployed, such as using small mobile energy storage charging stations to meet capacity requirements during charging, as well as to solve emergency rescue and charging queue issues. However, in the current charging logic of mobile energy storage charging stations, both charging and discharging of the energy storage battery require passing through a DC / DC module. Discharging requires at least two DC / DC modules before reaching the power distribution unit, necessitating the operation of multiple DC / DC modules. This results in high product costs, large product size, and limitations on large-scale deployment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an energy storage and charging device that addresses the aforementioned technical deficiencies of the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct an energy storage and charging device, including: a charging input terminal, a DC / DC conversion unit, at least one energy storage unit, a switching unit corresponding to each of the energy storage units, a power distribution unit, and at least one charging output terminal;

[0005] The charging input terminal is connected to the input terminal of the DC / DC conversion unit and is used to supply power to the input terminal of the DC / DC conversion unit through the charging input terminal when there is a charging input.

[0006] The first end of the switching unit is connected to the input end of the DC / DC conversion unit, the second end of the switching unit is connected to the output end of the DC / DC conversion unit, and the third end of the switching unit is connected to the corresponding energy storage unit; and the switching unit is used to switch the connection of the energy storage unit to the output end of the DC / DC conversion unit when the energy storage unit is in a charging state, or to switch the connection of the energy storage unit to the input end of the DC / DC conversion unit when the energy storage unit is in a discharging state.

[0007] The power distribution unit is connected to the output terminal of the DC / DC conversion unit and the charging output terminal. When there is a power demand at the charging output terminal, the power distribution unit distributes the output power of the DC / DC conversion unit to the charging output terminal through the corresponding output terminal of the power distribution unit.

[0008] Preferably, in one embodiment of the energy storage and charging device of this utility model, the switching unit includes a first switch and a second switch;

[0009] The first end of the first switch is the first end of the switching unit, the first end of the second switch is the second end of the switching unit, and the second ends of the first switch and the second ends of the second switch are connected to each other to form the third end of the switching unit.

[0010] Preferably, in one embodiment of the energy storage and charging device of this utility model, the first switch includes a first sub-switch and a second sub-switch; the second switch includes a third sub-switch and a fourth sub-switch.

[0011] The first terminal of the first sub-switch is connected to the positive input terminal of the DC / DC conversion unit, the second terminal of the first sub-switch is connected to the second terminal of the third sub-switch and the positive terminal of the energy storage unit, and the first terminal of the third sub-switch is connected to the positive output terminal of the DC / DC conversion unit.

[0012] The second terminal of the second sub-switch is connected to the negative input terminal of the DC / DC conversion unit, the second terminal of the second sub-switch is connected to the second terminal of the fourth sub-switch and the negative terminal of the energy storage unit, and the first terminal of the fourth sub-switch is connected to the negative output terminal of the DC / DC conversion unit.

[0013] Preferably, in one embodiment of the energy storage and charging device of the present invention, the device further includes a dual circuit breaker corresponding to each of the energy storage units;

[0014] The first terminal of the first switch of the dual circuit breaker is connected to the second terminal of the first sub-switch and the second terminal of the third sub-switch, and the second terminal of the first switch of the dual circuit breaker is connected to the positive terminal of the energy storage unit.

[0015] The first terminal of the second switch of the dual circuit breaker is connected to the second terminal of the second sub-switch and the second terminal of the fourth sub-switch, and the second terminal of the second switch of the dual circuit breaker is connected to the negative terminal of the energy storage unit.

[0016] Preferably, in one embodiment of the energy storage and charging device of the present invention, the energy storage unit includes one or more charging modules;

[0017] Furthermore, when the energy storage unit includes multiple charging modules, the multiple charging modules are connected in series and / or parallel.

[0018] Preferably, in one embodiment of the energy storage and charging device of this utility model, the DC / DC conversion unit includes a plurality of DC / DC modules connected in parallel with each other.

[0019] Preferably, in one embodiment of the energy storage and charging device of this utility model, the charging output terminal includes a charging switch and a charging gun;

[0020] The charging gun is connected to the power distribution unit via the charging switch.

[0021] Preferably, in one embodiment of the energy storage and charging device of this utility model, the charging switch includes a fifth sub-switch and a sixth sub-switch;

[0022] The first end of the fifth sub-switch is connected to the positive terminal of the corresponding output terminal of the power distribution unit, and the second end of the fifth sub-switch is connected to the positive terminal of the charging gun.

[0023] The first end of the sixth sub-switch is connected to the negative terminal of the corresponding output terminal of the power distribution unit, and the second end of the sixth sub-switch is connected to the negative terminal of the charging gun.

[0024] Preferably, in one embodiment of the energy storage and charging device of this utility model, the charging input terminal includes a pluggable connection terminal, and the device is connected to an external power input through the pluggable connection terminal.

[0025] Preferably, in one embodiment of the energy storage and charging device of this utility model, the pluggable connection terminal includes a DC charging pile connection terminal, and the device is connected to the charging output port of a DC charging pile through the DC charging pile connection terminal.

[0026] The energy storage and charging device of this utility model has the following advantages: while ensuring power capacity, it reduces the number of DC / DC modules, thereby reducing product cost and product size. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0028] Figure 1 This is a logic block diagram of an embodiment of an energy storage and charging device according to the present invention;

[0029] Figure 2 This is a circuit diagram of an embodiment of an energy storage and charging device according to this utility model;

[0030] Figure 3 This is a schematic diagram of the operation of an embodiment of an energy storage and charging device according to the present invention;

[0031] Figure 4 This is a schematic diagram of another embodiment of the energy storage and charging device of this utility model. Detailed Implementation

[0032] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 The image shows an embodiment of an energy storage and charging device according to the present invention. Figure 1 In one embodiment of the energy storage and charging device of the present invention, the device includes: a charging input terminal 110, a DC / DC conversion unit 120, at least one energy storage unit 140, a switching unit 130 corresponding to each energy storage unit 140, a power distribution unit 150, and at least one charging output terminal 160. The charging input terminal 110 is connected to the input terminal of the DC / DC conversion unit 120 and is used to supply power to the input terminal of the DC / DC conversion unit 120 through the charging input terminal 110 when there is a charging input. The first end of the switching unit 130 is connected to the input terminal of the DC / DC conversion unit 120, and the second end of the switching unit 130 is connected to the DC / DC conversion unit 120. The third terminal of the switching unit 130 is connected to the corresponding energy storage unit 140 at the output terminal of 0. The switching unit 130 is used to switch the connection of the energy storage unit 140 to the output terminal of the DC / DC conversion unit 120 when the energy storage unit 140 is in a charging state, or to switch the connection of the energy storage unit 140 to the input terminal of the DC / DC conversion unit 120 when the energy storage unit 140 is in a discharging state. The power distribution unit 150 is connected to the output terminal of the DC / DC conversion unit 120 and the charging output terminal 160. When the charging output terminal 160 has a power demand, the power of the output terminal of the DC / DC conversion unit 120 is distributed to the charging output terminal 160 through the corresponding output terminal of the power distribution unit 150.

[0034] Specifically, the charging input terminal 110 is used to connect to an external power supply input to provide power to the device. This power supply input can provide power input to the power distribution unit 150 through the DC / DC conversion unit 120, so that the power distribution unit 150 outputs the required power to the charging output terminal 160 according to the charging demand of the charging output terminal 160. The charging output terminal 160 is used to connect to an external device to charge the external device. The charging demand of the charging output terminal 160 can be determined by the external device.

[0035] The power input can also charge the energy storage unit 140 through the DC / DC converter unit 120. When a certain energy storage unit 140 needs to enter the charging state, the working state of the corresponding switching unit 130 can be controlled to enable the energy storage unit 140 to enter the charging state. That is, the switching unit 130 switches the output terminal of the DC / DC converter unit 120 to be connected to the energy storage unit 140, so that the energy storage unit 140 is powered through the output terminal of the DC / DC converter unit 120, thereby charging the energy storage unit 140.

[0036] When there is no power input at the charging input terminal 110, the energy storage unit 140 can be set to a discharging state, allowing the device to charge external devices by discharging through the energy storage unit 140. Specifically, when an energy storage unit 140 needs to discharge, the corresponding switching unit 130 can switch the energy storage unit 140 to the input terminal of the DC / DC conversion unit 120. The discharging of the energy storage unit 140 supplies power to the DC / DC conversion unit 120, which in turn provides power input to the power distribution unit 150. This allows the power distribution unit 150 to output the required power to the charging output terminal 160 according to the charging demand from the charging output terminal 160. In this case, it can be understood that there is no power input at the charging input terminal 110.

[0037] The operating state of the energy storage unit 140 and the power output state of the charging output terminal 160 can be set as needed. Specifically, all or part of the energy storage unit 140 can be set to charge individually, all or part of the charging output terminal 160 can be set to output power individually, or all or part of the energy storage unit 140 can be set to charge and all or part of the charging output terminal 160 can be set to output power simultaneously. Alternatively, some or all of the energy storage unit 140 can be set to discharge and all or part of the charging output terminal 160 can be set to output power simultaneously. No limitations are imposed here. The circuit operation configuration can be tailored to different application scenarios.

[0038] It is understood that the power distribution unit 150 can adopt existing power distribution methods to implement the power distribution process of the charging output terminal 160 as needed, and there is no limitation here. The output terminals of the power distribution unit 150 correspond one-to-one with the charging output terminals 160, and the corresponding output terminals of the power distribution unit 150 are used to connect to the corresponding charging output terminals 160.

[0039] During the specific operation of this device, different operating scenarios can be matched through the switching unit 130. That is, the switching state of the switching unit 130 can be set according to specific scenarios and needs to achieve charging or discharging of the energy storage unit 140. In some scenarios, the input and output of the energy storage unit 140 can also be shut off through the switching unit 130, that is, simultaneously disconnecting the connection between the energy storage unit 140 and the input and output terminals of the DC / DC conversion unit 120.

[0040] In one embodiment, the switching unit 130 includes a first switch and a second switch; the first end of the first switch is the first end of the switching unit 130, the first end of the second switch is the second end of the switching unit 130, and the second ends of the first and second switches are connected to each other to serve as the third end of the switching unit 130. Specifically, the switching unit 130 can be composed of a first switch and a second switch, and the state switching of the switching unit 130 can be achieved by controlling the states of the first and second switches. For example, when the energy storage module is in a discharging state, the first switch is set to be on and the second switch is set to be off. When the energy storage module is in a charging state, the first switch is set to be off and the second switch is set to be on. When the energy storage module is not participating in the operation, both the first and second switches are directly set to the off state.

[0041] In one embodiment, the first switch includes a first sub-switch and a second sub-switch; the second switch includes a third sub-switch and a fourth sub-switch; the first end of the first sub-switch is connected to the positive input terminal of the DC / DC conversion unit 120, the second end of the first sub-switch is connected to the second end of the third sub-switch and the positive terminal of the energy storage unit 140, and the first end of the third sub-switch is connected to the positive output terminal of the DC / DC conversion unit 120; the second end of the second sub-switch is connected to the negative input terminal of the DC / DC conversion unit 120, the second end of the second sub-switch is connected to the second end of the fourth sub-switch and the negative terminal of the energy storage unit 140, and the first end of the fourth sub-switch is connected to the negative output terminal of the DC / DC conversion unit 120.

[0042] Specifically, in the first switch, a first sub-switch and a second sub-switch are provided to control the connection between the positive and negative input terminals of the DC / DC converter unit 120 and the positive and negative terminals of the energy storage unit 140, respectively. That is, the first sub-switch controls the connection between the positive input terminal of the DC / DC converter unit 120 and the positive terminal of the energy storage unit 140, and the second sub-switch controls the connection between the negative input terminal of the DC / DC converter unit 120 and the negative terminal of the energy storage unit 140. Similarly, in the second switch, a third sub-switch and a fourth sub-switch are provided to control the connection between the positive and negative output terminals of the DC / DC converter unit 120 and the positive and negative terminals of the energy storage unit 140, respectively. That is, the third sub-switch controls the connection between the positive output terminal of the DC / DC converter unit 120 and the positive terminal of the energy storage unit 140, and the fourth sub-switch controls the connection between the negative output terminal of the DC / DC converter unit 120 and the negative terminal of the energy storage unit 140.

[0043] like Figure 2 As shown, in a switching unit 130, the first sub-switch includes switch aK11, the second sub-switch includes switch aK12, the third sub-switch includes switch aK13, and the fourth sub-switch includes switch aK11. The number of switching units 130 corresponds to the number of energy storage units 140, as follows: Figure 2 As shown, the number of switching units 130 and energy storage units 140 is set to N, where N is greater than or equal to 1. The number of charging output terminals 160 can also be set as needed, such as... Figure 2 As shown, the number of charging output terminals 160 is T, where T is greater than or equal to 1.

[0044] In one embodiment, the device further includes a dual-circuit breaker 160 corresponding to each energy storage unit 140; the first terminal of the first switch of the dual-circuit breaker 160 is connected to the second terminal of the first sub-switch and the second terminal of the third sub-switch, and the second terminal of the first switch of the dual-circuit breaker 160 is connected to the positive terminal of the energy storage unit 140; the first terminal of the second switch of the dual-circuit breaker 160 is connected to the second terminal of the second sub-switch and the second terminal of the fourth sub-switch, and the second terminal of the second switch of the dual-circuit breaker 160 is connected to the negative terminal of the energy storage unit 140.

[0045] Specifically, to protect the energy storage unit 140 and improve the safety of the device, a circuit breaker is connected to the energy storage unit 140 to prevent input or output overcurrent. This circuit breaker can be a dual-circuit breaker, with one switch connected to the positive terminal of the energy storage unit 140, meaning the positive terminal of the energy storage unit 140 is connected to the second terminals of the first and third sub-switches via this switch. The other switch of the dual-circuit breaker 160 is connected to the negative terminal of the energy storage unit 140, meaning the negative terminal of the energy storage unit 140 is connected to the second terminals of the second and fourth sub-switches via this switch. In one specific embodiment, each dual-circuit breaker 160 can be an integrated circuit breaker or composed of separate circuit breakers. Figure 2 As shown, the dual circuit breaker 160 corresponding to the energy storage unit 140 is circuit breaker QF1.

[0046] In one embodiment, the energy storage unit 140 includes one or more charging modules; and when the energy storage unit 140 includes multiple charging modules, the multiple charging modules are connected in series and / or parallel. Specifically, each energy storage unit 140 can be provided with multiple charging modules. The multiple charging modules are connected in series or parallel. Alternatively, they can be partially connected in series and partially in parallel to ultimately form the energy storage unit 140. Figure 2 In the illustrated embodiment, an energy storage unit 140 is a battery cluster containing K charging modules. The number of charging modules in different energy storage units 140 can be the same or different. That is, for different energy storage units 140, the value of K can be the same or different.

[0047] In one embodiment, the DC / DC conversion unit 120 includes a plurality of DC / DC modules connected in parallel. That is, the DC / DC conversion unit 120 can be composed of multiple DC / DC modules with the same or different power ratings connected in parallel. This increases the power output capability of the device through multiple DC / DC modules. Figure 2 In the illustrated embodiment, the DC / DC conversion unit 120 includes DC / DC module AU1, DC / DC module AU2, ..., DC / DC module AUM, for a total of M DC / DC modules. The number M can be set as needed.

[0048] In one embodiment, the charging output terminal 160 includes a charging switch 161 and a charging gun 162; the charging gun 162 is connected to the power distribution unit 150 via the charging switch 161. Specifically, in the charging output terminal 160, the power output of the charging gun 162 can be controlled or turned off by the charging switch 161, thereby controlling the actual charging process of the charging gun 162.

[0049] In one specific embodiment, the charging switch 161 includes a fifth sub-switch and a sixth sub-switch; the first end of the fifth sub-switch is connected to the positive terminal of the corresponding output terminal of the power distribution unit 150, and the second end of the fifth sub-switch is connected to the positive terminal of the charging gun 162; the first end of the sixth sub-switch is connected to the negative terminal of the corresponding output terminal of the power distribution unit 150, and the second end of the sixth sub-switch is connected to the negative terminal of the charging gun 162. Specifically, in the charging switch 161, the fifth sub-switch controls the connection or disconnection between the positive terminal of the power distribution unit 150 and the positive terminal of the charging gun 162, and the sixth sub-switch controls the connection or disconnection between the negative terminal of the power distribution unit 150 and the negative terminal of the charging gun 162. Figure 2 In the embodiment shown, in a charging switch 161, the fifth sub-switch includes switch 1K1, and the sixth sub-switch includes switch 1K2.

[0050] In one embodiment, the charging input terminal 110 includes a pluggable connection terminal through which the device connects to an external power input. Specifically, the charging input terminal 110 can be configured as a pluggable connection terminal to connect to an external power input, allowing the device to be moved as needed. Figure 2 In the illustrated embodiment, the charging input includes DC+ and DC- inputs, and the pluggable connection terminal can receive external DC DC+ and DC- inputs through corresponding pins, respectively.

[0051] In one embodiment, the pluggable connection terminal includes a DC charging pile connection terminal, through which the device connects to the charging output port of a DC charging pile. Specifically, the pluggable connection terminal can be a charging pile connection terminal that matches the charging interface of a DC charging pile, so as to supplement power or expand the capacity of an existing DC charging pile.

[0052] by Figure 2 The working process of the energy storage and charging device is explained using the illustrated embodiment as an example.

[0053] like Figure 3 As shown, the working process of the energy storage charging device based on the discharge of energy storage unit 140 is illustrated. When the energy storage unit 140 corresponding to BAT1 is in the discharge state (at this time, there is no power input to DC+ and DC-), the switching circuit breaker QF1 is turned on, and at the same time, switches aK11 and aK12 are turned on, while switches aK13 and aK14 are turned off. The output of BAT1 is input to the input terminal of DC / DC conversion unit 120 through circuit breaker QF1, switches aK11 and aK12. Switches 1K1 and 1K2 are turned on, and the power distribution unit 150 performs power distribution and outputs power at the corresponding output terminal to provide power output to the corresponding charging gun through switches 1K1 and 1K2.

[0054] like Figure 4 As shown, the working process of charging based on energy storage unit 140 in the energy storage charging device is illustrated. When the energy storage unit 140 corresponding to BAT1 is in the charging state (at this time, there is no power input to DC+ and DC-), the circuit breaker QF1 is turned on, while switches aK11 and aK12 are turned off, and switches aK13 and aK14 are turned on. The output of the output terminal of the DC / DC conversion unit 120 is input to the energy storage unit 140 corresponding to BAT1 through switches aK13, switches aK14 and circuit breaker QF1.

[0055] With the above configuration, compared to the traditional method of relying on multiple DC / DC modules to achieve the charging or discharging process of the energy storage module, this method reduces the number of DC / DC module layers, thereby reducing energy loss and accelerating the charging speed. In some embodiments, this device can vary the number of charging modules in the energy storage unit 140 to meet different application scenarios.

[0056] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An energy storage and charging device, characterized in that, include: The device includes a charging input terminal, a DC / DC conversion unit, at least one energy storage unit, a switching unit corresponding to each of the energy storage units, a power distribution unit, and at least one charging output terminal. The charging input terminal is connected to the input terminal of the DC / DC conversion unit and is used to supply power to the input terminal of the DC / DC conversion unit through the charging input terminal when there is a charging input. The first end of the switching unit is connected to the input end of the DC / DC conversion unit, the second end of the switching unit is connected to the output end of the DC / DC conversion unit, and the third end of the switching unit is connected to the corresponding energy storage unit; and the switching unit is used to switch the connection of the energy storage unit to the output end of the DC / DC conversion unit when the energy storage unit is in a charging state, or to switch the connection of the energy storage unit to the input end of the DC / DC conversion unit when the energy storage unit is in a discharging state. The power distribution unit is connected to the output terminal of the DC / DC conversion unit and the charging output terminal. When there is a power demand at the charging output terminal, the power distribution unit distributes the output power of the DC / DC conversion unit to the charging output terminal through the corresponding output terminal of the power distribution unit.

2. The energy storage and charging device according to claim 1, characterized in that, The switching unit includes a first switch and a second switch; The first end of the first switch is the first end of the switching unit, the first end of the second switch is the second end of the switching unit, and the second ends of the first switch and the second ends of the second switch are connected to each other to form the third end of the switching unit.

3. The energy storage and charging device according to claim 2, characterized in that, The first switch includes a first sub-switch and a second sub-switch; the second switch includes a third sub-switch and a fourth sub-switch; The first terminal of the first sub-switch is connected to the positive input terminal of the DC / DC conversion unit, the second terminal of the first sub-switch is connected to the second terminal of the third sub-switch and the positive terminal of the energy storage unit, and the first terminal of the third sub-switch is connected to the positive output terminal of the DC / DC conversion unit. The second terminal of the second sub-switch is connected to the negative input terminal of the DC / DC conversion unit, the second terminal of the second sub-switch is connected to the second terminal of the fourth sub-switch and the negative terminal of the energy storage unit, and the first terminal of the fourth sub-switch is connected to the negative output terminal of the DC / DC conversion unit.

4. The energy storage and charging device according to claim 3, characterized in that, The device also includes dual circuit breakers corresponding to each of the energy storage units; The first terminal of the first switch of the dual circuit breaker is connected to the second terminal of the first sub-switch and the second terminal of the third sub-switch, and the second terminal of the first switch of the dual circuit breaker is connected to the positive terminal of the energy storage unit. The first terminal of the second switch of the dual circuit breaker is connected to the second terminal of the second sub-switch and the second terminal of the fourth sub-switch, and the second terminal of the second switch of the dual circuit breaker is connected to the negative terminal of the energy storage unit.

5. The energy storage and charging device according to claim 1, characterized in that, The energy storage unit includes one or more charging modules; Furthermore, when the energy storage unit includes multiple charging modules, the multiple charging modules are connected in series and / or parallel.

6. The energy storage and charging device according to claim 1, characterized in that, The DC / DC conversion unit includes several DC / DC modules connected in parallel.

7. The energy storage and charging device according to claim 1, characterized in that, The charging output terminal includes a charging switch and a charging gun; The charging gun is connected to the power distribution unit via the charging switch.

8. The energy storage and charging device according to claim 7, characterized in that, The charging switch includes a fifth sub-switch and a sixth sub-switch; The first end of the fifth sub-switch is connected to the positive terminal of the corresponding output terminal of the power distribution unit, and the second end of the fifth sub-switch is connected to the positive terminal of the charging gun. The first end of the sixth sub-switch is connected to the negative terminal of the corresponding output terminal of the power distribution unit, and the second end of the sixth sub-switch is connected to the negative terminal of the charging gun.

9. The energy storage and charging device according to claim 1, characterized in that, The charging input terminal includes a pluggable connection terminal, through which the device connects to an external power input.

10. The energy storage and charging device according to claim 1, characterized in that, The pluggable connection terminal includes a DC charging pile connection terminal, and the device is connected to the charging output port of a DC charging pile through the DC charging pile connection terminal.

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