Control guide circuit applied to electric vehicle and liquid cooling device

Abstract

The application provides a control guide circuit applied to an electric vehicle and liquid cooling device. The control guide circuit comprises a connection confirmation circuit. The electric vehicle comprises a liquid cooling socket and a liquid cooling connection confirmation socket. The liquid cooling device comprises a liquid cooling plug and a liquid cooling connection confirmation plug. When the liquid cooling plug is connected to the liquid cooling socket, a vehicle end connection confirmation circuit and a pile end connection confirmation circuit form a loop, and the voltage of a detection point in the loop is used for indicating the connection state of the liquid cooling plug and the liquid cooling socket. The present application can solve the heat dissipation problem during charging of the power battery, and improve the charging power of a charging apparatus for the power battery.

Description

Control and steering circuits for electric vehicles and liquid cooling equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on September 30, 2023, with application number 202311287640.0, and priority to the Chinese patent application entitled “Control and guidance circuit for electric vehicles and liquid cooling equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of new energy vehicles, and in particular to a control and guidance circuit used in electric vehicles and liquid cooling equipment. Background Art

[0003] Breakthroughs in high-power battery charging technology have made it possible to fully charge batteries in a short period of time. However, in current practical applications, when charging a power battery at high power, the heat generated by the battery increases significantly. If this heat cannot be removed in a timely manner, it will affect the normal high-power charging process of the charging device.

[0004] Electric vehicles typically have a built-in thermal management system that dissipates heat from the power battery. However, as charging power increases, such as during supercharging, the heat generated by the power battery increases. Relying solely on the thermal management system for heat dissipation is limited, and the thermal management system's heat dissipation capacity can no longer meet the power battery's heat dissipation needs during high-power charging.

[0005] Summary of the Invention

[0006] The present application provides a control and guidance circuit for electric vehicles and liquid cooling equipment. When the charging device performs high-power charging for the power battery of the electric vehicle, the liquid cooling equipment under the vehicle can supply coolant to the thermal management system of the power battery, thereby solving the heat dissipation problem during charging of the power battery and increasing the charging power of the charging device for the power battery.

[0007] In a first aspect, a control guidance circuit for an electric vehicle and a liquid cooling device is provided. The control guidance circuit includes a connection confirmation circuit. The electric vehicle includes a liquid cooling socket and a liquid cooling connection confirmation socket. The liquid cooling device includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling socket is used to connect to one end of the liquid cooling plug, the other end of the liquid cooling socket is used to connect to the thermal management system of the power battery of the electric vehicle, and the other end of the liquid cooling plug is used to receive or output coolant. The connection confirmation circuit includes a vehicle-end connection confirmation circuit located at the electric vehicle and a pile-end connection confirmation circuit located at the liquid cooling device. The vehicle-end connection confirmation circuit is connected to the liquid cooling socket, and the pile-end connection confirmation circuit is connected to the liquid cooling plug. When the liquid cooling plug is connected to the liquid cooling socket, the vehicle-end connection confirmation circuit and the pile-end connection confirmation circuit form a loop, and the voltage at the detection point in the loop is used to indicate the connection status of the liquid cooling plug and the liquid cooling socket.

[0008] In the embodiment of the present application, the voltage at the detection point in the control pilot circuit can indicate the connection status between the liquid-cooled plug and the liquid-cooled socket. Therefore, if the voltage at the detection point indicates that the liquid-cooled socket and the liquid-cooled plug are successfully connected, when the charging pile is charging the power battery at high power, the liquid cooling device cools the power battery by injecting cooling medium into the power battery, thereby solving the heat dissipation problem during charging and increasing the charging power of the charging device.

[0009] In combination with the first aspect, in one possible design, the liquid cooling device also includes a grounding plug, the electric vehicle also includes a grounding socket, one end of the grounding plug is used to connect to one end of the grounding socket, the other end of the grounding plug is used to connect to the equipment ground platform, and the other end of the grounding socket is used to connect to the vehicle body ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The vehicle-end connection confirmation circuit includes a first vehicle-end connection confirmation circuit, the first vehicle-end connection confirmation circuit includes a first resistor and a first voltage source, and the first liquid cooling connection confirmation socket is connected to the first voltage source via the first resistor. The pile-end connection confirmation circuit includes a first pile-end connection confirmation circuit, the first pile-end connection confirmation circuit includes a second resistor, and the first liquid cooling connection confirmation plug is connected to the equipment ground platform via the second resistor. The detection point is located between the first liquid cooling connection confirmation socket and the first resistor.

[0010] In combination with the first aspect, in one possible design, the voltage at a detection point between the first liquid cooling connection confirmation socket and the first resistor reaches a first preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0011] In the embodiment of the present application, since the detection point provided in the present application is connected to the first voltage source in the electric vehicle, when the voltage at the detection point is the voltage output by the first voltage source, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at the detection point reaches a first preset value, it indicates that the liquid cooling socket is identified as being connected to the liquid cooling plug. The voltage at the detection point can indicate the connection status of the liquid cooling socket and the liquid cooling plug, and when the voltage at the detection point indicates that the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0012] In combination with the first aspect, in one possible design, the electric vehicle further includes a grounding socket, one end of which is used to connect to the grounding plug of the liquid cooling gun, and the other end of the grounding socket is connected to the vehicle body ground platform. The vehicle-end connection confirmation circuit further includes a second vehicle-end connection confirmation circuit, the second vehicle-end connection confirmation circuit includes a third resistor, and the second liquid cooling connection confirmation socket is connected to the vehicle body ground platform via the third resistor. The pile-end connection confirmation circuit further includes a second pile-end connection confirmation circuit, the second pile-end connection confirmation circuit includes a fourth resistor and a second voltage source, and the second liquid cooling connection confirmation plug is connected to the second voltage source via the fourth resistor. The detection point is located between the second liquid cooling connection confirmation plug and the fourth resistor.

[0013] In combination with the first aspect, in one possible design, the voltage at the detection point between the first liquid cooling connection confirmation socket and the first resistor reaches a first preset value, and the voltage at the detection point between the second liquid cooling connection confirmation plug and the fourth resistor reaches a second preset value, indicating that the liquid cooling plug and the liquid cooling socket are successfully connected.

[0014] In the embodiment of the present application, since the detection point set in the present application is connected to the voltage source, when the voltage at the detection point is the voltage output by the voltage source, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltages at the two detection points reach the first preset value and the second preset value respectively, it indicates that the liquid cooling socket is connected to the liquid cooling plug. The voltage at the detection point can indicate the connection status of the liquid cooling socket and the liquid cooling plug, and when the voltage at the detection point indicates that the liquid cooling socket is successfully connected to the liquid cooling plug, when the charging pile charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0015] In combination with the first aspect, in a possible design, the second pile end connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fourth resistor and the second liquid cooling connection confirmation plug.

[0016] In combination with the first aspect, in a possible design, the detection point includes two detection points, one of which is located between the fourth resistor and the normally closed switch, and the other is located between the second liquid cooling connection confirmation plug and the normally closed switch.

[0017] In combination with the first aspect, in one possible design, the voltages at the detection point between the fourth resistor and the normally closed switch and the detection point between the second liquid cooling connection confirmation plug and the normally closed switch both reach a second preset value, indicating that the liquid cooling plug and the liquid cooling socket are successfully connected.

[0018] In the embodiment of the present application, the voltages at the two detection points indicate the connection status of the liquid-cooling socket and the liquid-cooling plug, which can improve the accuracy of the liquid cooling device in judging the connection status of the liquid-cooling socket and the liquid-cooling plug based on the voltages at the two detection points. When the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0019] In combination with the first aspect, in one possible design, the electric vehicle also includes a grounding socket, one end of which is used to connect to the grounding plug of the liquid cooling gun, and the other end of the grounding socket is connected to the vehicle body ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The vehicle-end connection confirmation circuit includes a third vehicle-end connection confirmation circuit and a fourth vehicle-end connection confirmation circuit. The third vehicle-end connection confirmation circuit includes a fifth resistor and a third voltage source. The first liquid cooling connection confirmation socket is connected to the third voltage source via the fifth resistor, and the second liquid cooling connection confirmation socket is connected to the vehicle body ground platform. The pile-end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug via the wire. The detection point is located between the fifth resistor and the first liquid cooling connection confirmation socket.

[0020] In combination with the first aspect, in one possible design, the voltage at a detection point between the fifth resistor and the first liquid cooling connection confirmation socket reaches a third preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0021] In the embodiment of the present application, the electric vehicle can determine whether the liquid-cooled plug is successfully connected to the liquid-cooled socket based on the voltage at the detection point between the fifth resistor and the first liquid-cooled connection confirmation socket reaching a preset value. When the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the power battery's heat dissipation requirements during high-power charging, which is beneficial for increasing the charging power of the power battery and reducing the charging time of the electric vehicle. In addition, the circuit design of the vehicle-side connection confirmation circuit and the pile-side connection confirmation circuit in the embodiment of the present application is simple, which can be extremely simplified.

[0022] In combination with the first aspect, in one possible design, the electric vehicle also includes a grounding socket, one end of which is used to connect to the grounding plug of the liquid cooling gun, and the other end of the grounding socket is connected to the vehicle body ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The vehicle-end connection confirmation circuit includes a fifth vehicle-end connection confirmation circuit and a sixth vehicle-end connection confirmation circuit, the fifth vehicle-end connection confirmation circuit includes a fourth voltage source, the sixth vehicle-end connection confirmation circuit includes a sixth resistor, the first liquid cooling connection confirmation socket is connected to the fourth voltage source, and the second liquid cooling connection confirmation socket is connected to the vehicle body ground platform via the sixth resistor. The pile-end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug via a wire. The detection point is located between the sixth resistor and the second liquid cooling connection confirmation socket.

[0023] In combination with the first aspect, in one possible design, the voltage at a detection point between the sixth resistor and the second liquid cooling connection confirmation socket reaches a fourth preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0024] In the embodiment of the present application, the electric vehicle can determine that the liquid-cooled plug is successfully connected to the liquid-cooled socket based on the voltage at the detection point between the sixth resistor and the second liquid-cooled connection confirmation socket reaching a fourth preset value. When the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the power battery's heat dissipation requirements during high-power charging, which is beneficial for increasing the charging power of the power battery and reducing the charging time of the electric vehicle. In addition, the circuit design of the vehicle-side connection confirmation circuit and the pile-side connection confirmation circuit in the embodiment of the present application is simple, which can be extremely simplified.

[0025] In conjunction with the first aspect, in one possible design, the control and guidance circuit further includes a communication circuit, the liquid cooling device further includes a communication plug, and the vehicle socket further includes a communication socket. The communication circuit includes a first communication circuit located in the liquid cooling device and a second communication circuit located in the electric vehicle, wherein one end of the first communication circuit is connected to a controller of the liquid cooling device, and the other end of the first communication circuit is connected to the communication plug, and one end of the second communication circuit is connected to a controller of the electric vehicle, and the other end of the second communication circuit is connected to the communication socket.

[0026] In conjunction with the first aspect, in one possible design, the control and guidance circuit further includes an auxiliary power circuit, the liquid cooling device further includes an auxiliary power plug, and the vehicle socket further includes an auxiliary power socket. The auxiliary power circuit includes a first auxiliary power circuit located in the liquid cooling device and a second auxiliary power circuit located in the electric vehicle. One end of the first auxiliary power circuit is connected to a controller of the liquid cooling device, and the other end of the first auxiliary power circuit is connected to the auxiliary power plug. One end of the second auxiliary power circuit is connected to a controller of the electric vehicle, and the other end of the second auxiliary power circuit is connected to the auxiliary power socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic structural diagram of a charging system provided in an embodiment of the present application.

[0028] FIG2 is a schematic structural diagram of another charging system provided in an embodiment of the present application.

[0029] FIG3 is a schematic diagram of a heat dissipation system provided in an embodiment of the present application.

[0030] FIG4 is a schematic diagram of another heat dissipation system provided in an embodiment of the present application

[0031] FIG5 is a schematic diagram of another heat dissipation system provided in an embodiment of the present application

[0032] FIG6 is a schematic diagram of another heat dissipation system provided in an embodiment of the present application

[0033] FIG7 is a schematic structural diagram of another charging system provided in an embodiment of the present application.

[0034] FIG8 is a schematic diagram of a liquid injection interface provided in an embodiment of the present application.

[0035] FIG9 is a schematic diagram of another liquid injection interface provided in an embodiment of the present application.

[0036] FIG10 is a schematic diagram of another heat dissipation system provided in an embodiment of the present application.

[0037] FIG11 is a schematic diagram of another heat dissipation system provided in an embodiment of the present application.

[0038] FIG12 is a schematic diagram of another heat dissipation system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0040] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0041] References to "some embodiments" and the like in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0042] The “equal” mentioned in this application does not mean equal in a strict sense, but is within the allowable error range.

[0043] With the development of new energy vehicle technology, many automobile manufacturers have gradually launched electric vehicles. Electric vehicles have become the choice of many users because of their energy saving and environmental protection as well as relatively mature technology.

[0044] This application can be applied to systems where power supply devices and loads charge each other through a power distribution matrix. In particular, for systems that include charging piles and electric vehicles, the charging piles can use power from the grid to charge the electric vehicles, and the electric vehicles can also output their own power back to the grid.

[0045] FIG1 exemplarily shows a schematic structural diagram of a charging system 10 provided in an embodiment of the present application.

[0046] 1( a ) and 1 ( b ), the charging system 10 may include a charging device 11 and a vehicle 12 .

[0047] In some embodiments, as shown in FIG1(a), the charging device 11 can be a split-type device. Specifically, the charging device 11 can include a charging host 111, at least one charging terminal 112, and at least one charging gun 113. The charging host 111 is electrically connected to each charging terminal 112, and each charging terminal 112 is electrically connected to a charging gun 113 via a cable. The charging gun 113 is used to electrically connect to the electric vehicle 12.

[0048] The charging host 111 includes multiple power conversion devices, which can convert AC power from the external power grid 20 into DC power and transmit it to the charging terminal 112. The DC power is then transmitted to the electric vehicle 12 via a charging gun 113 electrically connected to the charging terminal 112. The multiple power conversion devices may include, for example, an alternating current-direct current (AC-DC) converter and a direct current-direct current (DC-DC) converter.

[0049] In specific implementation, the user can insert the charging gun 113 into the charging port of the electric vehicle 12 to electrically connect the charging gun 113 to the power battery of the electric vehicle 12 , and the charging host 111 can then charge the power battery of the electric vehicle 12 through the charging gun 113 .

[0050] The charging terminal 112 may include a housing, a human-computer interaction interface, a charging control unit, a metering and billing unit, etc. The charging terminal 112 may be used for information exchange, energy transmission, metering and billing, etc. with the vehicle 12 .

[0051] In other embodiments, as shown in FIG1( b ), the charging device 11 may be an integrated charging device. Specifically, the charging device 11 may include only a charging host 111 and at least one charging gun 113 electrically connected to the charging host 111, without including a charging terminal 112. The human-machine interface, charging control unit, and metering and billing unit may be directly incorporated into the charging host 111. The multiple power conversion devices within the charging host 111 convert AC power from the external power grid 20 into stable DC power, which is then directly delivered to the electric vehicle 12 via the charging gun 113.

[0052] In the aforementioned charging system 10, breakthroughs in high-power battery charging technology have enabled the battery to be fully charged in a short period of time. However, in current practical applications, when the charging device 11 performs high-power charging on the power battery, the heat generated by the power battery increases significantly. If this heat cannot be removed in a timely manner, it will affect the normal high-power charging of the power battery by the charging device 11.

[0053] Electric vehicles 12 typically have a built-in thermal management system that dissipates heat from the power battery. However, as charging power increases, such as during supercharging, the heat generated by the power battery increases. Relying solely on the thermal management system for heat dissipation is limited in effectiveness, and the thermal management system's heat dissipation capacity can no longer meet the power battery's heat dissipation requirements during high-power charging.

[0054] Although the power battery can be cooled by an external cooling system, the connection port of the external cooling system is only a single liquid inlet and outlet. When the charging pile is charging the power battery, the electric vehicle and the external cooling system cannot recognize whether they are connected to each other, which will affect the normal high-power charging of the power battery by the charging pile.

[0055] Based on this, the present application provides a charging system comprising a charging pile and an electric vehicle, wherein the charging pile comprises a charging device and a liquid cooling device. When the charging device is performing high-power charging of the electric vehicle's power battery, the liquid cooling device can deliver coolant to the power battery's thermal management system, thereby solving the heat dissipation problem during power battery charging and increasing the charging power of the charging device for the power battery.

[0056] FIG2 is a schematic diagram of the structure of a charging system 200 provided in an embodiment of the present application. It should be understood that in FIG2 , thin solid lines are used to represent power transmission lines, and short dashed lines are used to represent pipeline connection lines.

[0057] The charging system 200 may include an electric vehicle 300 and a charging pile 400 . The electric vehicle 300 may include an onboard charging connection device 310 and a power battery 320 , and the charging pile 400 may include a charging device 410 and a liquid cooling device 420 .

[0058] It is understood that the electric vehicle 300 may be the electric vehicle 12 shown in FIG1 , and the charging device 410 may be the split-type charging device shown in FIG1 (a) or the integrated charging device shown in FIG1 (b). For ease of description and understanding, the present embodiment of the application uses the split-type charging device shown in FIG1 (a) as an example for explanation.

[0059] It is also understandable that the liquid cooling device 420 can be disposed outside the charging device 410 or integrated with the charging device 410. For ease of description and understanding, the present embodiment of the application is described by taking the liquid cooling device 420 disposed outside the charging device 410 as an example.

[0060] Continuing to refer to Figure 2, the vehicle-mounted charging connection device 310 may include a vehicle-end charging interface 311, a DC output interface 312, a first liquid inlet and outlet 313 and a second liquid inlet and outlet 314, the charging device 410 may include a pile-end charging interface 411, and the liquid cooling device 420 may include a liquid cooling system 422 and a liquid cooling inlet and outlet 421.

[0061] The charging station-side charging interface 411 can be electrically connected to the vehicle-side charging interface 311, which is then electrically connected to the power battery 320 via the DC output interface 312. This allows the charging device 410 to transmit power to the power battery 320 via the onboard charging connection 310. For example, the charging device 410 can output DC power from the charging station-side charging interface 411, and the onboard charging connection 310 can transmit the DC power output from the charging station-side charging interface 411 to the power battery 320 via the DC output interface 312 to charge the power battery 320. Alternatively, the power battery 320 can output DC power to the DC output interface 312, and the onboard charging connection 310 can transmit the DC power output from the power battery 320 to the charging device 410 via the vehicle-side charging interface 311, thereby discharging the power battery 320 from the charging device 410.

[0062] In some embodiments, the number of the charging port 411 and the vehicle-side charging port 311 can be one or more. In a specific implementation, as shown in Figure 2, the split charging device 410 can include a charging host 412 and at least one charging terminal 413 electrically connected to the charging host 412. Each charging terminal 413 can be electrically connected to a charging gun (not shown) via a cable. The charging port 411 can be a charging plug provided in each charging gun, and the vehicle-side charging port 311 can be a charging socket provided on the vehicle-mounted charging connection device 310.

[0063] The liquid cooling inlet and outlet 421 can be used to connect to the first inlet and outlet 313, and the first inlet and outlet 313 can be connected to the power battery 320 through the second inlet and outlet 314, so that the liquid cooling device 420 can transmit liquid cooling medium to the power battery 320 through the on-board charging connection device 310 to achieve cooling of the power battery 320.

[0064] In a specific implementation, the liquid cooling device 420 may include a liquid cooling system 422, and a liquid cooling gun (not shown in the figure) connected to the liquid cooling device 422. The liquid cooling inlet and outlet 421 may be a liquid cooling connection plug set in the liquid cooling gun, and the first liquid inlet and outlet 313 may be a liquid cooling connection socket set on the vehicle-mounted charging connection device 310.

[0065] In the embodiment of the present application, a separate on-board charging connection device 310 is provided in the electric vehicle 300. The on-board charging connection device 310 has a vehicle-side charging interface 311 for electrically connecting to the charging device 410, and a first liquid inlet and outlet 313 connected to the liquid cooling device 420. This allows the power battery 320 to be directly connected to the charging device 410 and the liquid cooling device 420 simultaneously through the on-board charging connection device 310. In this way, when the power battery is charged at high power through the charging device 410, the liquid cooling device 420 outside the vehicle can be connected to the power battery 320, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging, which is beneficial for increasing the charging power of the power battery 320 and reducing the charging time of the electric vehicle.

[0066] The present application mainly relates to the identification of the connection status of the liquid cooling device 420 and the power battery. Therefore, the following will introduce the solution of the present application separately using the liquid cooling device and the electric vehicle as examples.

[0067] FIG3 is a schematic diagram of a heat dissipation system provided in an embodiment of the present application. In conjunction with FIG3 , the heat dissipation system includes an electric vehicle 300 and a liquid cooling device 420. The liquid cooling interface in FIG3 includes the liquid cooling inlet and outlet 421 and the first inlet and outlet 313 in FIG2 . The liquid cooling plug may include a liquid cooling inlet and outlet 412, and the liquid cooling socket may include a first inlet and outlet 312. In addition, the liquid cooling plug may further include a connection confirmation port and a connection confirmation circuit connected to the connection confirmation port, and the liquid cooling socket may further include a connection confirmation port and a connection confirmation circuit connected to the connection confirmation port.

[0068] In one embodiment, the connection confirmation circuit in the liquid cooling device can be connected to the liquid cooling controller 423, and the liquid cooling controller 423 determines the connection status between the liquid cooling plug and the liquid cooling socket through the connection confirmation circuit in the liquid cooling device. The connection confirmation circuit in the electric vehicle can be connected to the onboard controller 330, and the onboard controller 330 determines the connection status between the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit in the electric vehicle.

[0069] The following will explain the on-board charging connection device, electric vehicle, liquid cooling equipment, charging pile and control guidance circuit as examples.

[0070] First, the present application provides a vehicle-mounted charging connection device, which is applied to electric vehicles. The vehicle-mounted charging connection device includes a first vehicle socket and a liquid-cooled connection confirmation circuit. The first vehicle socket includes a liquid-cooled socket and a liquid-cooled connection confirmation socket.

[0071] One end of the liquid cooling socket is connected to the liquid cooling plug of the liquid cooling gun. The other end of the liquid cooling socket is connected to the power battery's thermal management system via the liquid cooling pipeline. The liquid cooling socket is used to receive coolant output by the liquid cooling plug, or to output coolant to the liquid cooling plug. One end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation plug of the liquid cooling gun. The other end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit.

[0072] The on-board charging connection device is used to determine the connection status of the liquid cooling socket and the liquid cooling plug through the liquid cooling connection confirmation circuit.

[0073] In the embodiment of the present application, the liquid cooling socket may include a liquid inlet and a liquid outlet, namely, a liquid inlet and a liquid outlet. The liquid inlet of the liquid cooling socket is connected to the liquid outlet of the liquid cooling plug, and the liquid outlet of the liquid cooling socket is connected to the liquid return port of the liquid cooling plug. Thus, the cooling medium of the liquid cooling device is input into the thermal management system of the power battery through the liquid cooling plug and the liquid cooling socket, thereby cooling the power battery.

[0074] In the prior art, the connection port of the under-vehicle cooling system is just a single liquid inlet and outlet. When the charging pile is charging the power battery of the electric vehicle, the electric vehicle and the cooling system under the vehicle cannot recognize each other whether they are connected, which affects the normal high-power charging of the power battery by the charging pile. In addition to the liquid inlet and outlet, the liquid cooling socket in the embodiment of the present application also includes a liquid cooling connection confirmation socket. Since the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit, the on-board charging connection device can determine the connection status of the liquid cooling socket and the liquid cooling plug based on the liquid cooling connection confirmation circuit. If the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging device is charging the power battery at high power, the liquid cooling device cools the power battery by injecting cooling medium into the thermal management system of the power battery.

[0075] In one embodiment, when the liquid cooling socket is connected to the liquid cooling plug and the DC socket is connected to the DC plug, the liquid cooling connection confirmation circuit in the vehicle-mounted charging connection device forms a current loop with the liquid cooling connection confirmation circuit through the liquid cooling connection confirmation socket and the liquid cooling connection confirmation plug.

[0076] The onboard charging connection device is used to detect the voltage at a detection point in the liquid cooling connection confirmation circuit to determine the connection status between the liquid cooling socket and the liquid cooling plug. In response to the voltage at the detection point in the liquid cooling connection confirmation circuit reaching a preset value on the vehicle side, the onboard charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0077] In the embodiment of the present application, when the liquid-cooling socket and the liquid-cooling plug are connected, the liquid-cooling connection confirmation circuit forms a current loop through the liquid-cooling connection confirmation socket and the liquid-cooling connection confirmation plug, and the liquid-cooling connection confirmation circuit of the liquid-cooling device. A detection point can be set in this current loop. When the voltage at the detection point reaches a preset value on the vehicle side, the on-board charging connection device determines that the liquid-cooling socket and the liquid-cooling plug are successfully connected.

[0078] Through this design, the on-board charging connection device can determine the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltage at the detection point. When the liquid-cooled socket and the liquid-cooled plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling system can cool the power battery by injecting cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0079] The vehicle-side preset value in the embodiment of the present application is related to the specific circuit form and the location of the detection point of the liquid cooling connection confirmation circuit. For details, please refer to the content of Figures 4-7 below.

[0080] The following will introduce the specific circuit form of the liquid cooling connection confirmation circuit and the strategy of the on-board charging connection device to determine the connection status of the liquid cooling socket and the liquid cooling plug with reference to the accompanying drawings.

[0081] In one embodiment, the liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket, the liquid cooling connection confirmation circuit includes a first liquid cooling connection confirmation circuit, and the first liquid cooling connection confirmation socket is connected to the first liquid cooling connection confirmation circuit.

[0082] The first liquid-cooling connection confirmation circuit includes a first resistance unit, and the first liquid-cooling connection confirmation socket is connected to a voltage source through the first resistance unit.

[0083] In response to the voltage at the detection point in the liquid cooling connection confirmation circuit reaching the first vehicle-end preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected, including: in response to the voltage at the detection point between the first resistance unit and the first liquid cooling connection confirmation socket reaching the first vehicle-end preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0084] Figure 4 shows a schematic diagram of a heat dissipation system according to an embodiment of the present application. The first resistor unit includes resistor R5, the first liquid-cooling connection confirmation socket corresponds to port CC2, and the voltage source is U2. The detection point between the first resistor unit and the first liquid-cooling connection confirmation socket is detection point 2.

[0085] Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 2 is connected to voltage source U2, the voltage at detection point 2 should be the voltage output by voltage source U2. Only when the liquid-cooled socket is connected to the liquid-cooled plug does voltage source U2 form a loop through resistor R5 in the electric vehicle, resistor R3 in the charging pile, and the ground wire in the charging pile. Due to the voltage divider function of the resistors, the voltage at detection point 2 will reach the first vehicle-side preset value.

[0086] For example, if the output voltage of voltage source U2 is set to 12V and the resistance values ​​of R3 and R5 are equal, the first vehicle-end preset value is 6V. In this design, if the voltage at detection point 2 is 6V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0087] For another example, if the output voltage of voltage source U2 is still set to 12V, but the resistance values ​​of R3 and R5 are different, such as R3 is 2Ω and R5 is 4Ω, then the first vehicle-side preset value is 4V. In this design, if the voltage at detection point 2 is 4V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0088] Therefore, based on the above analysis, when the voltage at detection point 2 is the voltage output by voltage source U2, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 2 reaches the first vehicle-side preset value, the on-board charging connection device can identify that the liquid-cooled socket is connected to the liquid-cooled plug.

[0089] In the embodiment of the present application, since the detection point provided in the present application is connected to the voltage source in the electric vehicle, when the voltage at the detection point is the voltage output by the voltage source, the on-board charging connection device identifies that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at the detection point reaches a first vehicle-side preset value, the on-board charging connection device identifies that the liquid-cooled socket is connected to the liquid-cooled plug. By identifying the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltage at the detection point, the accuracy of the on-board charging connection device in identifying the connection status of the liquid-cooled socket and the liquid-cooled plug can be improved, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to increasing the charging power of the power battery and reducing the charging time of the electric vehicle.

[0090] The above embodiment illustrates that the on-board charging connection device determines that the liquid-cooling receptacle and the liquid-cooling plug are connected when the voltage at detection point 2 reaches the first vehicle-side preset value. Furthermore, the on-board charging connection device can also determine the connection status between the first resistor unit and the voltage source based on the specific voltage value at detection point 2.

[0091] For example, if the contact inside the electric vehicle is good, because detection point 2 is located between resistors R5 and R3, and due to the voltage divider function of the resistors, the voltage at detection point 2 should be greater than 0 and less than the voltage source output voltage (i.e., the first vehicle-end preset value). For example, if the voltage source output voltage is 12V and the resistance values ​​of R5 and R3 are equal, the voltage at detection point 2 is 6V.

[0092] If there's poor contact inside the electric vehicle—for example, if R5 isn't connected to voltage source U2 and is suspended—this is equivalent to R5 and R3 being directly connected to the ground wire in the liquid cooling system. The voltage at any test point on the branch line formed by resistors R5, R3, and the ground wire is 0V. Because test point 2 is located on the branch line formed by resistors R5, R3, and the ground wire, the voltage at test point 2 is 0V.

[0093] Therefore, the on-board charging connection device can further determine the connection status inside the electric vehicle according to the voltage at the detection point 2, which is beneficial to improving the safety of the electric vehicle.

[0094] In one embodiment, the vehicle socket further includes a grounding socket, one end of which is used to connect to a grounding plug of the liquid cooling gun, and the other end of which is connected to a vehicle body ground platform.

[0095] The liquid-cooling connection confirmation socket further includes a second liquid-cooling connection confirmation socket, the liquid-cooling connection confirmation circuit further includes a second liquid-cooling connection confirmation circuit, and the second liquid-cooling connection confirmation socket is connected to the second liquid-cooling connection confirmation circuit.

[0096] The second liquid-cooling connection confirmation circuit includes a second resistance unit, and the second liquid-cooling connection confirmation socket is connected to the vehicle body ground platform through the second resistance unit.

[0097] In one embodiment, in response to the voltage of the detection point in the liquid cooling connection confirmation circuit reaching a first vehicle-end preset value, the on-board charging connection device is used to determine whether the liquid cooling socket and the liquid cooling plug are successfully connected, including: in response to the voltage of the detection point between the first resistance unit and the first liquid cooling connection confirmation socket reaching the first vehicle-end preset value, and in response to the voltage of the detection point between the second resistance unit and the second liquid cooling connection confirmation socket reaching the second vehicle-end preset value, the on-board charging connection device is used to determine whether the liquid cooling socket and the liquid cooling plug are successfully connected.

[0098] Figure 5 shows a schematic diagram of another heat dissipation system provided by an embodiment of the present application. The second resistor unit includes resistor R4, and the second liquid-cooling connection confirmation socket corresponds to port CC1. The detection point between the second resistor unit and the second liquid-cooling connection confirmation socket is detection point 3.

[0099] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at test point 3 should be 0V because it is connected to the vehicle's electrical platform. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the voltage source U1 in the charging pile form a loop through resistor R1 and resistor R4 in the electric vehicle. Due to the voltage divider function of the resistors, the voltage at test point 3 reaches the second vehicle-side preset value.

[0100] For example, if the output voltage of voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the second vehicle-end preset value is 6V. In this design, if the voltage at detection point 3 is 6V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0101] For another example, if the output voltage of voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 is 2Ω and R4 is 4Ω, then the second vehicle-end preset value is 8V. In this design, if the voltage at detection point 3 is 8V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0102] Therefore, based on the above analysis, when the voltage at detection point 2 is the voltage output by voltage source U2 and the voltage at detection point 3 is 0V, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 2 reaches the first vehicle-side preset value and the voltage at detection point 3 reaches the second vehicle-side preset value, the on-board charging connection device can identify that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0103] As shown in Figure 6, a schematic diagram of another heat dissipation system provided in an embodiment of the present application is shown. The first resistor unit includes R5 and a switch SV, the first liquid-cooling connection confirmation socket is still the socket corresponding to the CC2 port, and the detection point between the first resistor unit and the first liquid-cooling connection confirmation socket is detection point 2. The second resistor unit includes R4, R4', R4" and switches S2, S2', the second liquid-cooling connection confirmation socket is the socket corresponding to the CC1 port, and the detection point between the second resistor unit and the second liquid-cooling connection confirmation socket is detection point 3. The specific identification process is similar to that of Figure 5 and will not be repeated for the sake of brevity.

[0104] In an embodiment of the present application, by identifying the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltages of the two detection points, the accuracy of the vehicle-mounted charging connection device in identifying the connection status of the liquid-cooled socket and the liquid-cooled plug can be further improved, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0105] In some embodiments, the vehicle-mounted charging connection device can determine the connection status of the liquid cooling socket and the liquid cooling plug based solely on the voltage at detection point 3. The specific determination process has been described in the above embodiment and will not be repeated here.

[0106] Based on this, the above describes different embodiments of the on-board charging connection device for determining the connection status of the liquid cooling socket and the liquid cooling plug from the perspective of the on-board charging connection device. The following will be explained from the perspective of the liquid cooling device.

[0107] The present application provides a liquid cooling device, which includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system.

[0108] One end of the liquid cooling connection confirmation plug is used to connect to the liquid cooling connection confirmation socket of the electric vehicle, and the other end of the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit.

[0109] The liquid cooling device is used to determine the connection status of the liquid cooling plug and the liquid cooling socket through the liquid cooling connection confirmation circuit.

[0110] In the embodiment of the present application, the liquid cooling device can be integrated with the charging device, or the liquid cooling device can be designed to be separate from the charging device, without limitation.

[0111] The liquid cooling device in the embodiment of the present application includes a liquid cooling gun plug, which includes a liquid cooling plug and a liquid cooling connection confirmation plug. When the liquid cooling plug is successfully connected to the liquid cooling socket of the electric vehicle, the cooling medium in the liquid cooling device can enter the electric vehicle through the liquid cooling plug to achieve cooling of the power battery.

[0112] In the prior art, the connection port of the under-vehicle cooling system is just a single liquid inlet and outlet. When the charging pile is charging the power battery of the electric vehicle, the electric vehicle and the cooling system under the vehicle cannot recognize each other whether they are connected, which affects the normal high-power charging of the power battery by the charging pile. In addition to the liquid inlet and outlet, the liquid cooling plug in the embodiment of the present application also includes a liquid cooling connection confirmation plug. Since the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit, the liquid cooling device can determine the connection status of the liquid cooling plug and the liquid cooling socket based on the liquid cooling connection confirmation circuit. If the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging device is charging the power battery at high power, the liquid cooling device cools the power battery by injecting cooling medium into the power battery.

[0113] In one embodiment, when the liquid-cooling plug is connected to the liquid-cooling socket, the liquid-cooling connection confirmation circuit forms a current loop with the liquid-cooling connection confirmation circuit of the electric vehicle through the liquid-cooling connection confirmation plug and the liquid-cooling connection confirmation socket, and the liquid cooling equipment is used to detect the voltage of the detection point in the liquid-cooling connection confirmation circuit to determine the connection status of the liquid-cooling plug and the liquid-cooling socket.

[0114] In response to the voltage at the detection point reaching the preset value at the pile end, the liquid cooling device determines that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0115] In the embodiment of the present application, when the liquid-cooling plug is successfully connected to the liquid-cooling socket, the connection confirmation circuit forms a current loop through the connection confirmation socket and the connection confirmation plug and the connection confirmation circuit of the charging pile. A detection point can be set in the current loop. When the voltage at the detection point reaches a preset value at the charging pile end, the liquid cooling device determines that the liquid-cooling plug and the liquid-cooling socket are successfully connected.

[0116] Through this design, the liquid cooling equipment can judge the connection status of the liquid cooling socket and the liquid cooling plug according to the voltage of the detection point. When the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling equipment can cool the power battery by injecting cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0117] The pile end preset value in the embodiment of the present application is related to the specific circuit form of the connection confirmation circuit and the position of the detection point. For details, please refer to the content of Figures 4 to 6 below.

[0118] The following will introduce the specific circuit form of the liquid cooling connection confirmation circuit and the strategy of the liquid cooling device to determine the connection status of the liquid cooling socket and the liquid cooling plug with reference to the accompanying drawings.

[0119] In one embodiment, the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug, the liquid cooling connection confirmation circuit includes a third resistance unit, and the second liquid cooling connection confirmation plug is connected to the voltage source through the third resistance unit.

[0120] In one embodiment, the liquid cooling device is configured to determine a connection state between the liquid cooling plug and the liquid cooling socket based on a voltage at a detection point between the third resistance unit and the second liquid cooling connection confirmation plug.

[0121] In response to the voltage at the detection point between the third resistance unit and the second liquid cooling connection confirmation plug reaching the pile end preset value, the liquid cooling device is used to determine that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0122] Referring to FIG. 4 above, the third resistor unit in the embodiment of the present application is R1, the voltage source is still U1, and the detection between the third resistor unit and the second liquid-cooled connection confirmation plug is detection point 1. Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to voltage source U1, the voltage at detection point 1 should be the voltage output by voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current from voltage source U1 form a loop through resistor R1 in the DC device, resistor R4 in the electric vehicle, and the ground wire in the electric vehicle. Since detection point 1 is located between resistors R1 and R4, due to the voltage divider function of the resistors, the voltage at detection point 1 will reach the preset value at the pile end.

[0123] For example, if the output voltage of voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the default value of the terminal is 6V. In this design, if the voltage at detection point 1 is 6V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0124] For another example, if the output voltage of voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 is 2Ω and R4 is 4Ω, then the default value at the terminal is 8V. In this design, if the voltage at detection point 1 is 8V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0125] Based on the above analysis, when the voltage at detection point 1 is the voltage output by voltage source U1, the liquid cooling device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 1 is the preset value at the terminal, the liquid cooling device can identify that the liquid cooling socket is successfully connected to the liquid cooling plug.

[0126] The third resistance unit shown in FIG5 is similar to that in FIG4 , and the specific identification process is similar to that in FIG4 , which will not be described in detail.

[0127] Continuing with FIG6 , the fourth resistor unit of the present embodiment includes R1, R1′, switch S1, and switch S0. The voltage source is still U1, and the detection point between the third resistor unit and the second connection confirmation plug is still detection point 1. The specific identification process is similar to that of FIG4 and will not be repeated for the sake of brevity.

[0128] In the embodiment of the present application, since the detection point provided in the present application is connected to the voltage source in the liquid cooling device, when the voltage at the detection point is the voltage output by the voltage source, the liquid cooling device recognizes that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at the detection point reaches the preset value at the pile end, the liquid cooling device recognizes that the liquid cooling socket is successfully connected to the liquid cooling plug. By identifying the connection status of the liquid cooling socket and the liquid cooling plug based on the voltage at the detection point, the accuracy of the liquid cooling device in identifying the connection status of the liquid cooling socket and the liquid cooling plug can be improved. When the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0129] In one embodiment, the liquid cooling connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the third resistor unit and the second liquid cooling connection confirmation plug.

[0130] The liquid cooling device is used to judge the connection status of the liquid cooling plug and the liquid cooling socket based on the voltage of the detection point between the third resistance unit and the second liquid cooling connection confirmation plug, including: in response to the voltage of the detection point between the third resistance unit and the normally closed switch reaching the pile end preset value, and the voltage of the detection point between the normally closed switch and the second liquid cooling connection confirmation plug reaching the pile end preset value, the liquid cooling device is used to judge that the liquid cooling plug and the liquid cooling socket are successfully connected.

[0131] Referring to Figure 5 above, the third resistance unit in the embodiment of the present application is R1, the normally closed switch is S, the voltage source is still U1, the detection between the third resistance unit and the normally closed switch is detection point 1, and the detection point between the normally closed switch and the second liquid cooling connection confirmation plug is detection point 4.

[0132] Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to voltage source U1 and switch S is a normally closed switch, the voltages at detection points 1 and 4 should both be the voltage output by voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current from voltage source U1 form a loop through resistor R1 in the DC device, resistor R4 in the electric vehicle, and the ground wire in the electric vehicle. Since detection point 1 is located between resistors R1 and R4, the voltages at detection points 1 and 4 will reach the preset value at the terminal due to the voltage divider function of the resistors. Another possible scenario is that the liquid-cooled socket is connected to the liquid-cooled plug, but switch S is in the open state. In this case, detection point 1 is connected to voltage source U1, and detection point 4 is connected to the ground wire in the electric vehicle, resulting in the voltage at detection point 1 being the voltage output by voltage source U1 and the voltage at detection point 4 being 0V.

[0133] For example, if the output voltage of voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the default value at the terminal is 6V. In this design, if the voltage at test point 1 is 6V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are successfully connected. If the voltage at test point 1 is 12V and the voltage at test point 4 is 0V, it indicates that the liquid cooling socket and liquid cooling plug are connected, but switch S is disconnected.

[0134] For another example, let's assume that voltage source U1 still outputs 12V, but the resistance values ​​of R1 and R4 are different—for example, R1 is 2Ω and R4 is 4Ω—then the default value at the terminal is 8V. In this design, if the voltage at test point 1 is 8V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected. If the voltage at test point 1 is 12V and the voltage at test point 4 is 0V, the liquid cooling socket and liquid cooling plug are connected, but switch S is disconnected.

[0135] Based on the above analysis, when the voltage at detection points 1 and 4 is the voltage output by voltage source U1, the liquid cooling device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection points 1 and 4 is the preset value at the terminal end, the liquid cooling device can identify that the liquid cooling socket and the liquid cooling plug are successfully connected. When the voltage at detection point 1 is the voltage output by voltage source U1 and the voltage at detection point 4 is 0V, the liquid cooling device identifies that the liquid cooling socket and the liquid cooling plug are connected but switch S is in the off state.

[0136] In an embodiment of the present application, by identifying the connection status of the liquid-cooling socket and the liquid-cooling plug based on the voltages of the two detection points, the accuracy of the liquid cooling device in identifying the connection status of the liquid-cooling socket and the liquid-cooling plug can be further improved. When the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0137] The above describes how to determine the connection status between the liquid-cooled plug and the liquid-cooled socket using the on-board charging connection device and the liquid-cooled device respectively. In addition to determining the connection status between the liquid-cooled socket and the liquid-cooled plug, the on-board charging connection device can also determine the connection status between the DC socket and the DC plug.

[0138] In one embodiment, the on-board charging connection device further includes a charging connection confirmation circuit and a second vehicle socket, the second vehicle socket including a DC socket and a charging connection confirmation socket. One end of the DC socket is used to connect to the DC plug of the charging gun, and the other end of the DC socket is connected to the power battery. One end of the charging connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the charging connection confirmation socket is connected to the charging connection confirmation circuit.

[0139] The vehicle-mounted charging connection device is used to determine the connection status between the DC socket and the DC plug through the charging connection confirmation circuit.

[0140] For determining the connection status of the DC socket and DC plug, please refer to the relevant standards. The following will briefly introduce the on-board charging connection device and charging pile to determine the connection status of the DC plug and DC socket with reference to Figure 7.

[0141] 7 , the onboard charging connection device can determine the connection status of the DC plug and DC socket by detecting the voltage at point 2. The charging pile can determine the connection status of the DC plug and DC socket by detecting the voltage at point 1.

[0142] Before the DC socket is connected to the DC plug, since test point 2 is connected to voltage source U2 and test point 1 is connected to voltage source U1, the voltage at test point 2 should be the voltage output by voltage source U2, and the voltage at test point 1 should be the voltage output by voltage source U1. Only when the DC socket is connected to the DC plug will voltage source U2 form a loop through resistor R5 in the electric vehicle, resistor R3 in the charging pile, and the ground wire in the charging pile, and voltage source U1 form a loop through resistors R1 and R4 and the ground wire in the electric vehicle. Due to the voltage divider function of the resistors, the voltage at test point 2 will be a preset value between 0 and U2, and the voltage at test point 1 will be a preset value between 0 and U1.

[0143] For example, if the output voltage of voltage sources U1 and U2 is set to 12V, the resistance values ​​of R1 and R4 are equal, and the resistance values ​​of R3 and R5 are equal, then if the voltage at detection point 2 is 6V, the on-board charging connection device recognizes that the DC socket and DC plug are successfully connected. If the voltage at detection point 1 is 6V, the charging pile recognizes that the DC socket and DC plug are successfully connected.

[0144] It should be understood that the numerical values ​​shown in the above embodiment are only examples, and the specific values ​​of the voltage source and the resistance can refer to the relevant standards.

[0145] In one embodiment, the second vehicle socket further includes an auxiliary power socket, one end of which is used to connect to the auxiliary power plug of the charging gun, and the other end of which is used to receive direct current power. The second vehicle socket further includes a second communication socket, one end of which is used to connect to the communication plug of the charging gun, and the other end of which is connected to the controller.

[0146] In this embodiment of the present application, the auxiliary power socket in the second vehicle socket can be the socket corresponding to A+ and A- in Figure 7 above. The second communication socket can be the socket corresponding to S+ and S- in Figure 7 above. The charging pile and the electric vehicle can transmit messages through the second communication socket and the second communication plug. For detailed descriptions, please refer to the relevant content of A+, A- and S+, S- in the charging standard and will not be repeated here.

[0147] In one embodiment, the vehicle-mounted charging connection device is used to: when the liquid-cooled socket is successfully connected to the liquid-cooled plug, and the DC socket is successfully connected to the DC plug, send a message to the charging pile for requesting the charging pile to output a first charging power; or, when the DC socket is successfully connected to the DC plug, send a message to the charging pile for requesting the charging pile to output a second charging power, and the second charging power is less than the first charging power.

[0148] In the embodiment of the present application, when the liquid-cooled socket is successfully connected to the liquid-cooled plug, and the DC socket is successfully connected to the DC plug, it indicates that the electric vehicle has met the conditions for supercharging. That is, when the power battery is charged at high power, the liquid cooling device under the vehicle can transmit a cooling medium to the power battery's thermal management system through the liquid-cooled plug and the liquid-cooled socket. Therefore, the on-board charging connection device can send a message to the charging pile to request the charging pile to output a first charging power. The first charging power can be a power greater than a certain threshold. Therefore, when the charging pile charges the power battery at the first charging power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the power battery's heat dissipation requirements during high-power charging, which is beneficial to increasing the charging power of the power battery and reducing the charging time of the electric vehicle.

[0149] If the DC socket and DC plug are successfully connected, the electric vehicle is not eligible for supercharging. Specifically, if the power battery is charging at high power, the liquid cooling equipment under the vehicle cannot transmit cooling medium to the power battery. Therefore, the on-board charging connection device can send a message to the charging pile requesting the charging pile to output a second charging power. This second charging power can be less than a certain threshold. Therefore, when the charging pile charges the power battery at the second charging power, because the second charging power is less than the threshold, the on-board thermal management system can cool the power battery, eliminating the need for the liquid cooling equipment under the vehicle to cool the power battery.

[0150] Based on this, the above describes the connection confirmation circuit and how it determines the connection status between the DC socket and DC plug, as well as the connection status between the liquid cooling socket and liquid cooling plug. The following describes the sequence of contact coupling between the plug and socket of the liquid cooling gun during the connection process.

[0151] In one embodiment, the first vehicle socket includes a plug-in end for plugging and unplugging with the charging gun, and the distance from the liquid cooling connection confirmation socket to the plug-in end is greater than or equal to the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end. The liquid cooling plug includes a plug-in end for plugging and unplugging with the vehicle socket, and the distance from the liquid cooling connection confirmation plug to the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end.

[0152] In an embodiment of the present application, the distance from the liquid-cooled connection confirmation socket to the plug-in end is greater than or equal to the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end. If the distance from the liquid-cooled connection confirmation socket to the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end, in this case, it is equivalent to the contacts of the liquid inlet and outlet of the liquid-cooled socket being coupled with the contacts of the liquid inlet and outlet of the liquid-cooled plug first, and the contacts of the liquid-cooled connection confirmation socket being coupled with the contacts of the liquid-cooled connection confirmation plug later. In other words, the coupling of the contacts of the liquid-cooled connection confirmation socket with the contacts of the liquid-cooled connection confirmation plug is later than the coupling of the contacts of the liquid inlet and outlet of the liquid-cooled socket with the contacts of the liquid inlet and outlet of the liquid-cooled plug.

[0153] Figure 8 shows a schematic diagram of a liquid injection interface provided by an embodiment of the present application. The plug-in / plug-out port is the dashed line between the liquid cooling plug and the liquid cooling receptacle shown in the figure. PE is the ground port, CC1 and CC2 are ports indicating liquid cooling connection confirmation, S+ and S- are communication ports, and I and O are the liquid inlet and outlet, respectively.

[0154] In an embodiment of the present application, the distance from the liquid-cooled connection confirmation plug to the plug-in end includes two, namely d1 and d2, the distance from the liquid inlet and outlet of the liquid-cooled plug to the plug-in end is d0, and d1>d0, d2>d0. The distance from the liquid-cooled connection confirmation socket to the plug-in end includes two, namely d1' and d2', the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end is d0', and d1'>d0', d2'>d0'. Based on this design, in the process of connecting the liquid-cooled socket to the liquid-cooled plug, the liquid inlet and outlet of the liquid-cooled socket are first connected to the liquid inlet and outlet of the liquid-cooled plug, and then the liquid-cooled connection confirmation socket is connected to the liquid-cooled connection confirmation plug (i.e., CC1, CC2), which is conducive to realizing that when the charging pile charges the electric vehicle at high power, the liquid cooling equipment under the vehicle cools the power battery. This is because, if the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation plug first, and the liquid cooling socket's liquid inlet and outlet are connected to the liquid cooling plug's liquid inlet and outlet later, it is possible that the CC1 port and CC2 port are connected, but the liquid cooling socket's liquid inlet and outlet are not connected to the liquid cooling plug's liquid inlet and outlet, resulting in incorrect liquid port connection confirmation and possible leakage. Therefore, in the implementation of this application, the distance from the liquid cooling connection confirmation socket to the plug-in end is designed to be greater than or equal to the distance from the liquid cooling socket's liquid inlet and outlet to the plug-in end, and the distance from the liquid cooling connection confirmation plug to the plug-in end is greater than the distance from the liquid cooling plug's liquid inlet and outlet to the plug-in end, which can avoid leakage.

[0155] In one embodiment, the distance from the first liquid-cooling connection confirmation socket to the plug-in end is greater than or equal to the distance from the second liquid-cooling connection confirmation socket to the plug-in end. The distance from the first liquid-cooling connection confirmation plug to the plug-in end is greater than or equal to the distance from the second liquid-cooling connection confirmation plug to the plug-in end.

[0156] In the embodiment of the present application, the electric vehicle determines the connection status of the liquid cooling socket and the liquid cooling plug based on the first liquid cooling connection confirmation socket and the first liquid cooling connection confirmation plug. The liquid cooling device determines the connection status of the liquid cooling socket and the liquid cooling plug based on the second liquid cooling connection confirmation socket and the second liquid cooling connection confirmation plug.

[0157] In this embodiment of the present application, the distance from the first liquid-cooling connection confirmation socket to the plug-in end is greater than or equal to the distance from the second liquid-cooling connection confirmation socket to the plug-in end, and the distance from the first liquid-cooling connection confirmation plug to the plug-in end is greater than or equal to the distance from the second liquid-cooling connection confirmation plug to the plug-in end. This is equivalent to the electric vehicle performing the final full connection confirmation, or the electric vehicle and the liquid cooling device jointly performing the final full connection confirmation.

[0158] The following takes the final full connection confirmation of an electric vehicle as an example. Referring to Figure 8, the distance from the first liquid-cooled connection confirmation plug to the plug-in end is d2, and the distance from the first liquid-cooled connection confirmation socket to the plug-in end is d2'. The distance from the second liquid-cooled connection confirmation plug to the plug-in end is d1, and the distance from the second connection confirmation socket to the plug-in end is d1', and d2>d1, d2'>d1'. Based on this design, in the process of connecting the liquid-cooled socket and the liquid-cooled plug, the contacts of the second connection confirmation socket and the contacts of the second connection confirmation plug (i.e. CC1) are connected first, and the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug (i.e. CC2) are connected later, which is equivalent to the final full connection confirmation by the electric vehicle, which is beneficial for the on-board charging connection device of the electric vehicle to judge the connection status of the liquid-cooled socket and the liquid-cooled plug, and further, the confirmation efficiency can be increased. This is because the on-board charging connection device needs to send a message requesting charging power to the charging pile. The size of the charging power is determined by the on-board charging connection device. When the liquid-cooled socket is connected to the liquid-cooled plug, the on-board charging connection device can send a message requesting a higher power to the charging pile. When the liquid-cooled socket is not connected to the liquid-cooled plug, the on-board charging connection device can send a message requesting a lower power to the charging pile. If the liquid-cooled device performs the final full connection confirmation, the liquid-cooling device also needs to send a message to the electric vehicle indicating that the liquid-cooled socket and the liquid-cooled plug are successfully connected. In this case, the liquid-cooling device needs to wait until the communication socket and the communication plug are successfully connected before sending the message, which increases the delay and reduces the efficiency. Therefore, in the embodiment of the present application, the design of the electric vehicle performing the final full connection confirmation can improve the efficiency of judging the connection status of the liquid-cooled socket and the liquid-cooled plug.

[0159] It should be noted that in the embodiment of the present application, d2 = d1 and d2' = d1' can also be designed. Based on this design, during the connection between the liquid-cooling socket and the liquid-cooling plug, the first connection confirmation socket and the first connection confirmation plug (i.e., CC2) and the second connection confirmation socket and the second connection confirmation plug (i.e., CC1) are simultaneously connected, which is equivalent to the liquid-cooling device and the electric vehicle jointly performing the final complete connection confirmation. This design can also improve the efficiency of determining the connection status of the liquid-cooling socket and the liquid-cooling plug.

[0160] In one embodiment, the electric vehicle includes a traction device, which is used to traction the liquid cooling gun so that the first vehicle socket and the liquid cooling gun are fully connected.

[0161] The liquid-cooled connection confirmation socket also includes a third liquid-cooled connection confirmation socket, the distance from the second liquid-cooled connection confirmation socket to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation socket to the plug-in end, the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end is less than the distance from the third liquid-cooled connection confirmation socket to the plug-in end, and the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end is greater than or equal to the distance from the first liquid-cooled connection confirmation socket to the plug-in end.

[0162] The liquid-cooled connection confirmation plug also includes a third liquid-cooled connection confirmation plug, the distance from the second liquid-cooled connection confirmation plug to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation plug to the plug-in end, the distance from the liquid inlet and outlet of the liquid-cooled plug to the plug-in end is less than the distance from the third liquid-cooled connection confirmation plug to the plug-in end, and the distance from the liquid inlet and outlet of the liquid-cooled plug to the plug-in end is greater than or equal to the distance from the first liquid-cooled connection confirmation plug to the plug-in end.

[0163] In one embodiment of the present application, a traction device in an electric vehicle is used to pull the liquid cooling gun to move so that the first vehicle socket and the liquid cooling gun are fully connected. In this case, when the user inserts the liquid cooling gun into the first vehicle socket, the liquid cooling gun and the first vehicle socket are initially in a semi-connected state. The traction device then pulls the liquid cooling gun to move so that the liquid cooling gun and the first vehicle socket are fully connected. Because the traction device pulls the liquid cooling gun to move the liquid cooling gun and the first vehicle socket during this process, the user does not need to manually push the liquid cooling gun, which can improve the user experience.

[0164] 9 , compared with the embodiment shown in FIG8 , the embodiment of the present application adds a third liquid cooling connection confirmation socket and a third liquid cooling connection confirmation plug, and the third liquid cooling connection confirmation socket and the third liquid cooling connection confirmation plug correspond to the CC3 port in FIG9 .

[0165] The distance from the first liquid-cooling connection confirmation plug to the plug-in end is d2, and the distance from the first liquid-cooling connection confirmation socket to the plug-in end is d2'. The distance from the second liquid-cooling connection confirmation plug to the plug-in end is d1, the distance from the second liquid-cooling connection confirmation socket to the plug-in end is d1', the distance from the third liquid-cooling connection confirmation plug to the plug-in end is d3, and the distance from the third liquid-cooling connection confirmation socket to the plug-in end is d3'. And d2 ≤ d0 < d1 = d3, d2' ≤ d0' < d1' = d3'. Based on this design, during the connection process of the liquid-cooling socket and the liquid-cooling plug, the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug (i.e., CC2) are connected first, then the liquid inlet and outlet of the liquid-cooling socket and the liquid inlet and outlet of the liquid-cooling plug are connected, and then the contacts of the second connection confirmation socket and the contacts of the second connection confirmation plug (i.e., CC1), and the contacts of the third connection confirmation socket and the contacts of the third connection confirmation plug (i.e., CC3) are connected finally. Among them, the connection of the first liquid-cooling connection confirmation socket and the first liquid-cooling connection confirmation plug can indicate that the liquid-cooling gun and the vehicle socket are in a semi-connected state, and the connection of the second liquid-cooling connection confirmation socket and the second liquid-cooling connection confirmation plug, and the connection of the third liquid-cooling connection confirmation socket and the third liquid-cooling connection confirmation plug can indicate that the liquid-cooling gun and the vehicle socket are in a fully connected state. Since d1 = d3 and d1' = d3', it is equivalent to jointly performing the final full connection confirmation by the electric vehicle and the liquid-cooling device, that is, the electric vehicle and the liquid-cooling device have the same timing for judging the connection state of the liquid-cooling socket and the liquid-cooling plug, which can ensure that the liquid-cooling medium is timely transmitted to the thermal management system of the power battery and can also avoid misjudgment of the liquid-cooling device.

[0166] In the embodiment of the present application, when the contacts of the first liquid-cooling connection confirmation socket and the contacts of the first liquid-cooling connection confirmation plug are connected, it indicates that the liquid-cooling socket and the liquid-cooling plug are in a semi-connected state. The traction device can traction the liquid-cooling gun to move so that the liquid-cooling gun approaches the first vehicle socket, and finally makes the liquid-cooling gun and the first vehicle socket in a fully connected state, without the user manually pushing the liquid-cooling gun, which can improve the user experience. If it is designed that d0 < d2, that is, the contacts of the liquid inlet and outlet of the liquid-cooling socket and the contacts of the liquid inlet and outlet of the liquid-cooling plug are connected first, and the contacts of the first liquid-cooling connection confirmation socket and the contacts of the first liquid-cooling connection confirmation plug are connected later. The disadvantage of such a design is that it requires the user to first connect the contacts of the liquid inlet and outlet of the liquid-cooling socket and the contacts of the liquid inlet and outlet of the liquid-cooling plug. However, it is difficult for the user alone to successfully connect the contacts of the liquid inlet and outlet of the liquid-cooling socket and the contacts of the liquid inlet and outlet of the liquid-cooling plug, which reduces the user experience.

[0167] In addition, in the embodiments of the present application, it is designed that the distance from the second liquid cooling connection confirmation socket to the plug-in end is equal to the distance from the third liquid cooling connection confirmation socket to the plug-in end, and the distance from the second liquid cooling connection confirmation plug to the plug-in end is equal to the distance from the third liquid cooling connection confirmation plug to the plug-in end, that is, d1 = d3, d1' = d3'. This is because if it is designed that d1 > d3, d1' > d3', it means that the third liquid cooling connection confirmation socket and the third liquid cooling connection confirmation plug are connected first, and the second liquid cooling connection confirmation socket and the second liquid cooling connection confirmation plug are connected later. There may be a situation where the third liquid cooling connection confirmation socket and the third liquid cooling connection confirmation plug are successfully connected, but the second liquid cooling connection confirmation socket and the second liquid cooling connection confirmation plug are never connected. Based on this situation, the liquid cooling device determines that the liquid cooling socket and the liquid cooling plug are not connected, and the liquid cooling device will not transmit the cooling medium to the thermal management system of the power battery, thus unable to solve the heat dissipation problem during the charging of the power battery and affecting the high-power charging of the power battery.

[0168] If it is designed that d1 < d3, d1' < d3', it means that the second liquid cooling connection confirmation socket and the second liquid cooling connection confirmation plug are connected first, and the third liquid cooling connection confirmation socket and the third liquid cooling connection confirmation plug are connected later. There may be a situation where the second liquid cooling connection confirmation socket and the second liquid cooling connection confirmation plug are successfully connected, but the third liquid cooling connection confirmation socket and the third liquid cooling connection confirmation plug are never connected. Based on this situation, the liquid cooling device determines that the liquid cooling socket and the liquid cooling plug are connected, but in fact, the electric vehicle determines that the liquid cooling socket and the liquid cooling plug are not connected, resulting in misjudgment of the liquid cooling device.

[0169] Of course, in some possible embodiments, the second connection confirmation port, that is, the CC1 port, may not be provided in the liquid cooling gun. When the electric vehicle determines that the liquid cooling socket and the liquid cooling plug are successfully connected, the electric vehicle sends a message to the liquid cooling device to indicate the successful connection of the liquid cooling socket and the liquid cooling plug.

[0170] As pointed out above, when the electric vehicle includes a traction device, the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug (i.e., CC2) are connected first, and it can be considered that the liquid cooling gun and the electric vehicle are in a semi-connected state. The specific circuit design form can refer to FIG. 10.

[0171] Referring to Figure 10 , the first connection confirmation socket is connected to voltage source U2 via R5, and the first connection confirmation socket is also connected to voltage source U2 via R7. The on-board charging connection device can determine whether the liquid cooling gun and the electric vehicle are in a semi-connected state based on detection point 5 between the first connection confirmation socket and R7. When the user inserts the liquid cooling gun into the vehicle socket, before the liquid cooling gun and the electric vehicle are in a semi-connected state, since detection point 5 is connected to voltage source U2, the voltage at detection point 5 should be the voltage output by voltage source U2. Only when the liquid cooling gun and the electric vehicle are in a semi-connected state does the current from voltage source U2 form a loop through resistor R7 in the electric vehicle, resistor R6 in the liquid cooling device, and the ground wire in the liquid cooling device. Since detection point 5 is located between resistors R7 and R6, the voltage at detection point 5 will reach the preset value due to the voltage divider function of the resistors.

[0172] For example, if the voltage output by voltage source U2 is set to 12 V and the resistance values ​​of R7 and R6 are equal, then the third preset value is 6 V. In this design, if the voltage at detection point 5 is 6 V, it means that the liquid cooling socket and the liquid cooling plug are in a semi-connected state.

[0173] Based on the above analysis, when the voltage at detection point 5 is the voltage output by voltage source U2, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 5 is the third preset value, it indicates that the liquid cooling socket and the liquid cooling plug are in a semi-connected state.

[0174] In one embodiment, in response to the liquid cooling socket and the liquid cooling plug being successfully connected, the vehicle-mounted charging connection device is configured to send a message indicating that the liquid cooling socket and the liquid cooling plug are successfully connected. Correspondingly, the liquid cooling device is configured to receive the message indicating that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0175] In this embodiment of the present application, when the onboard charging connection device determines that the liquid-cooling socket and the liquid-cooling plug are successfully connected, the onboard charging connection device can send a message to the liquid cooling device, indicating that the connection between the liquid-cooling socket and the liquid-cooling plug is successful. After receiving this message, the liquid cooling device no longer needs to determine the connection status of the liquid-cooling plug and the liquid-cooling socket based on the voltage at the detection point in the connection confirmation circuit, thereby improving the efficiency of the determination.

[0176] In addition, the present application also provides an electric vehicle, which includes an on-board charging connection device, a power battery, and a thermal management system. The thermal management system is used to dissipate heat for the power battery.

[0177] The on-board charging connection device includes a first vehicle socket and a liquid cooling connection confirmation circuit. The first vehicle socket includes a liquid cooling socket and a liquid cooling connection confirmation socket. One end of the liquid cooling socket is used to connect to the liquid cooling plug of a liquid cooling gun, and the other end of the liquid cooling socket is connected to the thermal management system via a liquid cooling pipeline. The liquid cooling socket is used to receive coolant output by the liquid cooling plug, or the liquid cooling socket is used to output coolant to the liquid cooling plug. One end of the liquid cooling connection confirmation socket is used to connect to the liquid cooling connection confirmation plug of the liquid cooling gun, and the other end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit.

[0178] Electric vehicles are designed to determine the connection status between the liquid-cooling receptacle and the liquid-cooling plug using a liquid-cooling connection confirmation circuit. The specific methods for determining the connection status between the liquid-cooling receptacle and the liquid-cooling plug using the liquid-cooling connection confirmation circuit, and for determining the connection status between the DC receptacle and the DC plug using the charging connection confirmation circuit, are described above and will not be further elaborated.

[0179] The present application also provides a charging pile, which includes a liquid cooling device, a power module, and a charging gun. The charging gun is connected to the power module and is used to charge an electric vehicle.

[0180] The liquid cooling device includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit, and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system. One end of the liquid cooling connection confirmation plug is used to connect to the liquid cooling connection confirmation socket of the electric vehicle, and the other end of the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit.

[0181] The charging pile is used to determine the connection status of the liquid cooling plug and the liquid cooling socket through the liquid cooling connection confirmation circuit.

[0182] For the specific method in which the charging pile determines the connection status of the liquid cooling plug and the liquid cooling socket based on the liquid cooling connection confirmation circuit, please refer to the above-mentioned content on the specific identification of liquid cooling equipment, which will not be repeated here.

[0183] As mentioned above, the liquid cooling device determines the connection status of the liquid cooling socket and the liquid cooling plug based on the voltage of the detection point in the connection confirmation circuit. In some embodiments, the liquid cooling device can also identify the connection status of the liquid cooling socket and the liquid cooling plug based on other methods. Please see below for details.

[0184] An embodiment of the present application provides a vehicle-mounted charging connection device, which is applied to electric vehicles. The vehicle-mounted charging connection device includes a first vehicle socket and a liquid cooling connection confirmation circuit. The first vehicle socket includes a liquid cooling socket and a liquid cooling connection confirmation socket. The first vehicle socket is used to connect a liquid cooling gun of a liquid cooling device.

[0185] One end of the liquid cooling socket is used to connect to the liquid cooling plug of the liquid cooling gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery through the liquid cooling pipeline. The liquid cooling socket is used to receive the coolant output by the liquid cooling plug, or the liquid cooling socket is used to output the coolant to the liquid cooling plug.

[0186] One end of the liquid cooling connection confirmation socket is used to connect to the liquid cooling connection confirmation plug of the liquid cooling gun, and the other end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit.

[0187] The on-board charging connection device is used to: determine the connection status of the liquid-cooled socket and the liquid-cooled plug through the liquid-cooled connection confirmation circuit; in response to the successful connection between the liquid-cooled socket and the liquid-cooled plug, send a message to the liquid cooling device to indicate that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0188] Correspondingly, for the liquid cooling equipment, the liquid cooling equipment includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system through a pipeline.

[0189] One end of the liquid cooling connection confirmation plug is used to connect to the liquid cooling connection confirmation socket of the electric vehicle, and the other end of the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit.

[0190] The liquid cooling device is used to receive a message sent from the electric vehicle to indicate that the liquid cooling socket and the liquid cooling plug are successfully connected; in response to the successful connection between the liquid cooling socket and the liquid cooling plug, the liquid cooling system is used to output coolant to the electric vehicle through the liquid cooling plug.

[0191] In an embodiment of the present application, the liquid-cooling socket includes, in addition to the liquid inlet and outlet, a liquid-cooling connection confirmation socket. Since the liquid-cooling connection confirmation socket is connected to a liquid-cooling connection confirmation circuit, the on-board charging connection device can determine the connection status of the liquid-cooling socket and the liquid-cooling plug based on the liquid-cooling connection confirmation circuit. If the liquid-cooling socket and the liquid-cooling plug are successfully connected, when the charging device is charging the power battery at high power, the liquid-cooling socket receives coolant from the liquid-cooling device and transmits this coolant to the power battery's thermal management system to cool the power battery. This solves the heat dissipation problem during power battery charging and increases the charging power of the charging device. Furthermore, if the on-board charging connection device determines that the liquid-cooling socket and the liquid-cooling plug are successfully connected, it can send a message to the liquid-cooling device indicating that the connection between the liquid-cooling socket and the liquid-cooling plug is successful. This eliminates the need for the liquid-cooling device itself to determine the connection status of the liquid-cooling socket and the liquid-cooling plug, saving time in determining the connection status of the socket and the plug and improving efficiency.

[0192] In one embodiment, when the liquid-cooled socket is connected to the liquid-cooled plug, the liquid-cooled connection confirmation circuit of the liquid-cooled connection confirmation socket and the liquid-cooled connection confirmation circuit of the liquid-cooled connection confirmation plug form a current loop, and the on-board charging connection device is used to detect the voltage of the detection point in the current loop to determine the connection status of the liquid-cooled socket and the liquid-cooled plug.

[0193] In response to the voltage of the detection point in the liquid cooling connection confirmation circuit reaching a vehicle-side preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0194] In the embodiment of the present application, when the liquid-cooled socket and the liquid-cooled plug are connected, the liquid-cooled connection confirmation circuit forms a current loop through the liquid-cooled connection confirmation socket and the liquid-cooled connection confirmation plug, and with the liquid-cooled connection confirmation circuit of the charging pile. A detection point can be set in the current loop, and when the voltage at the detection point in the current loop reaches a preset value on the vehicle side, the on-board charging connection device determines that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0195] The vehicle-side preset value in the embodiment of the present application is related to the specific circuit form and the location of the detection point of the liquid cooling connection confirmation circuit. For details, please refer to the content about Figures 11 and 12 below.

[0196] In one embodiment, the vehicle socket further includes a grounding socket, one end of which is used to connect to a grounding plug of a liquid cooling gun, and the other end of which is connected to a vehicle body ground platform. The liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The liquid cooling connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug via the wire. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket. The liquid cooling connection confirmation circuit includes a first resistor unit. The first liquid cooling connection confirmation socket is connected to a voltage source via the first resistor unit, and the second liquid cooling connection confirmation circuit is connected to the vehicle body ground platform.

[0197] In one embodiment, in response to the voltage at the detection point between the first resistance unit and the first liquid cooling connection confirmation socket reaching a vehicle-side preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0198] Figure 11 is a schematic diagram of a heat dissipation system according to an embodiment of the present application. The first resistor unit includes resistor R5, the first liquid-cooling connection confirmation socket corresponds to port CC2, and the voltage source is U2. The detection point between the first resistor unit and the first liquid-cooling connection confirmation socket is detection point 2.

[0199] Before the liquid-cooling socket is connected to the liquid-cooling plug, since Test Point 2 is connected to voltage source U2, the voltage at Test Point 2 should be the voltage output by voltage source U2. Only when the liquid-cooling socket is connected to the liquid-cooling plug does voltage source U2 form a loop through resistor R5 in the electric vehicle, the cables in the liquid-cooling system, and the ground wire in the electric vehicle. The voltage at Test Point 2 will reach the vehicle-side preset value. Because Test Point 2 is connected to the ground wire, the voltage at Test Point 2 should be 0V.

[0200] Therefore, based on the above analysis, when the voltage at detection point 2 is the voltage output by voltage source U2, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 2 reaches the preset value on the vehicle side, the on-board charging connection device can identify that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0201] In one embodiment, the vehicle socket also includes a grounding socket, one end of the grounding socket is used to connect to the grounding plug of the liquid cooling gun, and the other end of the grounding socket is connected to the vehicle body ground platform, the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug, the liquid cooling connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire.

[0202] The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation circuit includes a second resistance unit.

[0203] The first liquid cooling connection confirmation socket is connected to a voltage source, and the second liquid cooling connection confirmation socket is connected to a vehicle body ground platform through a second resistance unit.

[0204] In one embodiment, in response to the voltage at the detection point between the second resistance unit and the second liquid cooling connection confirmation socket reaching a vehicle-side preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0205] Figure 12 shows a schematic diagram of a heat dissipation system according to an embodiment of the present application. The second resistor unit includes resistor R5', the second liquid-cooling connection confirmation socket corresponds to the CC1 port, and the voltage source is U2. The detection point between the second resistor unit and the second liquid-cooling connection confirmation socket is detection point 3.

[0206] Before the liquid-cooling socket is connected to the liquid-cooling plug, the voltage at Test Point 3 should be 0V, as it is connected to the vehicle's ground platform. Only when the liquid-cooling socket is connected to the liquid-cooling plug does voltage source U2 form a loop through the liquid-cooling device's cables, the electric vehicle's resistor R5', and the electric vehicle's ground wire, allowing the voltage at Test Point 3 to reach the vehicle's preset value. Because Test Point 3 is connected to voltage source U2, the voltage at Test Point 3 should be the voltage output by voltage source U2.

[0207] Therefore, based on the above analysis, when the voltage at detection point 3 is 0V, the on-board charging connection device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 3 reaches the preset value on the vehicle side, the on-board charging connection device can identify that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0208] In one embodiment, both the onboard charging connection device and the liquid cooling device include a wireless communication module; the onboard charging connection device is configured to send messages to the charging station via the wireless communication module. Accordingly, the liquid cooling device also includes a wireless communication module; the liquid cooling device is configured to receive and send messages via the wireless communication module.

[0209] The wireless communication module in the embodiment of the present application may include Bluetooth, WiFi, Star Flash, etc.

[0210] In one embodiment, the electric vehicle includes a traction device, which is used to traction the liquid cooling gun so that the first vehicle socket and the liquid cooling gun are fully connected.

[0211] The liquid-cooled connection confirmation socket also includes a third liquid-cooled connection confirmation socket, the distance from the second liquid-cooled connection confirmation socket to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation socket to the plug-in end, the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end is less than the distance from the third liquid-cooled connection confirmation socket to the plug-in end, and the distance from the liquid inlet and outlet of the liquid-cooled socket to the plug-in end is greater than or equal to the distance from the first liquid-cooled connection confirmation socket to the plug-in end.

[0212] In one embodiment, the vehicle-mounted charging connection device also includes a charging connection confirmation circuit and a second vehicle socket, the second vehicle socket including a DC socket and a charging connection confirmation socket; one end of the DC socket is used to connect to the DC plug of the charging gun, and the other end of the DC socket is connected to the power battery; one end of the charging connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the charging connection confirmation socket is connected to the charging connection confirmation circuit; the vehicle-mounted charging connection device is used to determine the connection status of the DC socket and the DC plug through the charging connection confirmation circuit.

[0213] In one embodiment, the second vehicle socket also includes an auxiliary power socket, one end of the auxiliary power socket is used to connect to the auxiliary power plug of the charging gun, and the other end of the auxiliary power socket is used to receive direct current power; the second vehicle socket also includes a second communication socket, one end of the second communication socket is used to connect to the communication plug of the charging gun, and the other end of the second communication socket is connected to the controller.

[0214] In one embodiment, the vehicle-mounted charging connection device is used to: when the liquid-cooled socket is successfully connected to the liquid-cooled plug, and the DC socket is successfully connected to the DC plug, send a message to the charging pile for requesting the charging pile to output a first charging power; or, when the DC socket is successfully connected to the DC plug, send a message to the charging pile for requesting the charging pile to output a second charging power, and the second charging power is less than the first charging power.

[0215] For details about this part, please refer to the relevant content in the above embodiment and will not be elaborated on here.

[0216] In the above embodiment, the electric vehicle determines the connection status between the liquid-cooled socket and the liquid-cooled plug based on the connection confirmation circuit. If the connection is successful, the electric vehicle sends a message to the liquid cooling device to notify the liquid cooling device of the successful connection between the liquid-cooled socket and the liquid-cooled plug. In another possible embodiment, the liquid cooling device can also send this message to the on-board charging connection device. The liquid cooling device can determine the connection status between the liquid-cooled socket and the liquid-cooled plug based on the connection confirmation circuit. If the connection is successful, the electric vehicle sends a message to the on-board charging pile device to notify the on-board charging connection device of the successful connection between the liquid-cooled socket and the liquid-cooled plug.

[0217] In addition, the present application also provides an electric vehicle, which includes an on-board charging connection device, a power battery, and a thermal management system. The on-board charging connection device is applied to the electric vehicle, and the on-board charging connection device includes a first vehicle socket and a liquid cooling connection confirmation circuit. The first vehicle socket includes a liquid cooling socket and a liquid cooling connection confirmation socket. The first vehicle socket is used to connect to a liquid cooling gun of a liquid cooling device. One end of the liquid cooling socket is used to connect to the liquid cooling plug of the liquid cooling gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery via a liquid cooling pipeline. The liquid cooling socket is used to receive coolant output by the liquid cooling plug, or the liquid cooling socket is used to output coolant to the liquid cooling plug; one end of the liquid cooling connection confirmation socket is used to connect to the liquid cooling connection confirmation plug of the liquid cooling gun, and the other end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit. The electric vehicle is used to: determine the connection status of the liquid cooling socket and the liquid cooling plug through the liquid cooling connection confirmation circuit; in response to the successful connection between the liquid cooling socket and the liquid cooling plug, send a message to the liquid cooling device to indicate the successful connection between the liquid cooling socket and the liquid cooling plug.

[0218] Electric vehicles are designed to determine the connection status between the liquid-cooling receptacle and the liquid-cooling plug using a liquid-cooling connection confirmation circuit. The specific methods for determining the connection status between the liquid-cooling receptacle and the liquid-cooling plug using the liquid-cooling connection confirmation circuit, and for determining the connection status between the DC receptacle and the DC plug using the charging connection confirmation circuit, are described above and will not be further elaborated.

[0219] The present application also provides a charging pile, which includes a liquid cooling device, a power module and a charging gun. The liquid cooling device includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system through a pipeline. One end of the liquid cooling connection confirmation plug is used to connect to the liquid cooling connection confirmation socket of the electric vehicle, and the other end of the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit. The liquid cooling device is used to receive a message sent from the electric vehicle to indicate that the liquid cooling socket and the liquid cooling plug are successfully connected. In response to the successful connection between the liquid cooling socket and the liquid cooling plug, the liquid cooling system is used to output coolant to the electric vehicle through the liquid cooling plug.

[0220] For details about the liquid cooling equipment in the charging pile, please refer to the above specific content about the liquid cooling equipment, which will not be repeated here.

[0221] In addition, the present application also provides a control guidance circuit applied to electric vehicles and liquid cooling equipment, the control guidance circuit includes a connection confirmation circuit, the electric vehicle includes a liquid cooling socket and a liquid cooling connection confirmation socket, and the liquid cooling equipment includes a liquid cooling plug and a liquid cooling connection confirmation plug.

[0222] One end of the liquid cooling socket is used to connect to one end of the liquid cooling plug, and the other end of the liquid cooling socket is used to connect to the thermal management system of the power battery of the electric vehicle, and the other end of the liquid cooling plug is used to receive or output coolant.

[0223] The connection confirmation circuit includes a vehicle-end connection confirmation circuit located at the electric vehicle and a pile-end connection confirmation circuit located at the liquid cooling device. The vehicle-end connection confirmation circuit is connected to the liquid cooling socket, and the pile-end connection confirmation circuit is connected to the liquid cooling plug.

[0224] When the liquid-cooling plug is connected to the liquid-cooling socket, the vehicle-end connection confirmation circuit and the pile-end connection confirmation circuit form a loop, and the voltage at the detection point in the loop is used to indicate the connection status of the liquid-cooling plug and the liquid-cooling socket.

[0225] The control guidance circuit in the embodiment of the present application can be applied to electric vehicles and liquid cooling equipment. In other words, a part of the connection confirmation circuit in the control guidance circuit (i.e., the vehicle-end connection confirmation circuit) is located in the electric vehicle, and the other part of the connection confirmation circuit (i.e., the pile-end connection confirmation circuit) is located in the liquid cooling equipment. When the liquid-cooling plug is not connected to the liquid-cooling socket, the vehicle-end connection confirmation circuit located in the electric vehicle is a separate circuit, and the pile-end connection confirmation circuit located in the liquid cooling equipment is a separate circuit. Only when the liquid-cooling plug is connected to the liquid-cooling socket can the vehicle-end connection confirmation circuit located in the electric vehicle and the pile-end connection confirmation circuit located in the liquid cooling equipment form a loop.

[0226] In the prior art, the connection port of the cooling system under the vehicle is only a single liquid inlet and outlet. When the charging pile is charging the power battery of the electric vehicle, the electric vehicle and the cooling system under the vehicle cannot recognize each other whether they are connected, which will affect the normal high-power charging of the power battery by the charging pile. In the embodiment of the present application, the voltage of the detection point in the control guidance circuit can indicate the connection status of the liquid-cooled plug and the liquid-cooled socket. Therefore, when the voltage at the detection point indicates that the liquid-cooled socket and the liquid-cooled plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby solving the heat dissipation problem when the power battery is charging and improving the charging power of the charging device for the power battery.

[0227] The specific circuit form of the control steering circuit will be introduced below.

[0228] In one embodiment, the liquid cooling device also includes a grounding plug, and the electric vehicle also includes a grounding socket, one end of the grounding plug is used to connect to one end of the grounding socket, the other end of the grounding plug is used to connect to the equipment ground platform, and the other end of the grounding socket is used to connect to the vehicle body ground platform, the liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug.

[0229] The vehicle-end connection confirmation circuit includes a first vehicle-end connection confirmation circuit, the first vehicle-end connection confirmation circuit includes a first resistor and a first voltage source, and the first liquid-cooled connection confirmation socket is connected to the first voltage source through the first resistor.

[0230] The pile end connection confirmation circuit includes a first pile end connection confirmation circuit, the first pile end connection confirmation circuit includes a second resistor, and the first liquid cooling connection confirmation plug is connected to the equipment ground platform through the second resistor.

[0231] The detection point is located between the first liquid cooling connection confirmation socket and the first resistor.

[0232] In one embodiment, a voltage at a detection point between the first liquid-cooling connection confirmation socket and the first resistor reaches a first preset value, indicating that the liquid-cooling plug is successfully connected to the liquid-cooling socket.

[0233] 4 , the first resistor and the second resistor in the embodiment of the present application include resistors R5 and R3 , respectively, the first voltage source is U2 , and the detection point between the first resistor and the first liquid cooling connection confirmation socket is detection point 2 .

[0234] Before the liquid-cooling socket is connected to the liquid-cooling plug, since detection point 2 is connected to the first voltage source U2, the voltage at detection point 2 should be the voltage output by first voltage source U2. Only when the liquid-cooling socket is connected to the liquid-cooling plug does first voltage source U2 form a loop through resistor R5 in the electric vehicle, resistor R3 in the liquid-cooling device, and the ground wire in the liquid-cooling device. Due to the voltage divider function of the resistors, the voltage at detection point 2 will reach the first preset value.

[0235] For example, if the output voltage of the first voltage source U2 is set to 12 V and the resistance values ​​of R3 and R5 are equal, the first preset value is 6 V. In this design, if the voltage at detection point 2 is 6 V, it means that the liquid cooling socket and the liquid cooling plug are connected.

[0236] For another example, if the output voltage of the first voltage source U2 is still set to 12V, but the resistance values ​​of R3 and R5 are different, such as R3 is 2Ω and R5 is 4Ω, then the first preset value is 4V. In this design, if the voltage at detection point 2 is 4V, it indicates that the liquid cooling socket and liquid cooling plug are connected.

[0237] Therefore, based on the above analysis, if the voltage at detection point 2 is the voltage output by the first voltage source U2, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 2 reaches the first preset value, it indicates that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0238] In the embodiment of the present application, since the detection point provided in the present application is connected to the first voltage source in the electric vehicle, when the voltage at the detection point is the voltage output by the first voltage source, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at the detection point reaches a first preset value, it indicates that the liquid cooling socket is identified as being connected to the liquid cooling plug. The voltage at the detection point can indicate the connection status of the liquid cooling socket and the liquid cooling plug, and when the voltage at the detection point indicates that the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0239] In one embodiment, the vehicle-end connection confirmation circuit further includes a second vehicle-end connection confirmation circuit, the second vehicle-end connection confirmation circuit includes a third resistor, and the second liquid-cooled connection confirmation socket is connected to the vehicle body ground platform through the third resistor.

[0240] The pile end connection confirmation circuit further includes a second pile end connection confirmation circuit, the second pile end connection confirmation circuit includes a fourth resistor and a second voltage source, and the second liquid cooling connection confirmation plug is connected to the second voltage source through the fourth resistor.

[0241] The detection point is located between the second liquid cooling connection confirmation plug and the fourth resistor.

[0242] In one embodiment, the voltage at the detection point between the first liquid cooling connection confirmation socket and the first resistor reaches a first preset value, and the voltage at the detection point between the second liquid cooling connection confirmation plug and the fourth resistor reaches a second preset value, indicating that the liquid cooling plug and the liquid cooling socket are successfully connected.

[0243] 4 , the third resistor and the fourth resistor in the embodiment of the present application include R4 and R1 , respectively. The second voltage source in the liquid cooling device is U1 , and the detection point between the second liquid cooling connection confirmation plug and the fourth resistor is detection point 1 .

[0244] Before the liquid-cooling socket is connected to the liquid-cooling plug, since detection point 1 is connected to the second voltage source U1 and detection point 2 is connected to the first voltage source U2, the voltage at detection point 1 should be the voltage output by the second voltage source U1, and the voltage at detection point 2 should be the voltage output by the first voltage source U2. Only when the liquid-cooling socket is connected to the liquid-cooling plug, the second voltage source U1 in the liquid-cooling device forms a loop through resistor R1 and resistor R4 in the electric vehicle, and the first voltage source U2 forms a loop through resistors R5 and R3 and the ground wire in the liquid-cooling device. Due to the voltage divider function of the resistors, the voltage at detection point 1 will reach the second preset value, and the voltage at detection point 2 will reach the first preset value.

[0245] For example, if the output voltage of the first voltage source U2 and the second voltage source U1 is 12V, the resistance values ​​of R1 and R4 are equal, and the resistance values ​​of R5 and R3 are equal, then the first preset value and the second preset value are 6V. In this design, if the voltage at detection point 1 and detection point 2 is 6V, it indicates that the liquid cooling socket and liquid cooling plug are connected.

[0246] Therefore, based on the above analysis, if the voltage at detection point 2 is the voltage output by the first voltage source U2 and the voltage at detection point 1 is the voltage output by the second voltage source U1, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 2 reaches the first preset value and the voltage at detection point 1 reaches the second preset value, it indicates that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0247] In some embodiments, the connection status of the liquid cooling socket and the liquid cooling plug may also be determined based on the voltage at detection point 1 .

[0248] In the embodiment of the present application, since the detection point set in the present application is connected to the voltage source, when the voltage at the detection point is the voltage output by the voltage source, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltages at the two detection points reach the first preset value and the second preset value respectively, it indicates that the liquid cooling socket is connected to the liquid cooling plug. The voltage at the detection point can indicate the connection status of the liquid cooling socket and the liquid cooling plug, and when the voltage at the detection point indicates that the liquid cooling socket is successfully connected to the liquid cooling plug, when the charging pile charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0249] In one embodiment, the second pile end connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fourth resistor and the second liquid cooling connection confirmation plug.

[0250] In one embodiment, the detection point includes two detection points, one of which is located between the fourth resistor and the normally closed switch, and the other is located between the second liquid cooling connection confirmation plug and the normally closed switch.

[0251] In one embodiment, the voltages at the detection point between the fourth resistor and the normally closed switch and the detection point between the second liquid cooling connection confirmation plug and the normally closed switch both reach a second preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0252] 5 , the two detection points in the embodiment of the present application are detection point 1 and detection point 4 . For the specific judgment process, please refer to the above content regarding FIG. 5 , which will not be described in detail.

[0253] In one embodiment, the electric vehicle also includes a grounding socket, one end of the grounding socket is used to connect the grounding plug of the liquid cooling gun, and the other end of the grounding socket is connected to the vehicle body ground platform, the liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug.

[0254] The vehicle-end connection confirmation circuit includes a third vehicle-end connection confirmation circuit and a fourth vehicle-end connection confirmation circuit. The third vehicle-end connection confirmation circuit includes a fifth resistor and a third voltage source. The first liquid-cooled connection confirmation socket is connected to the first voltage source through the first resistor, and the second liquid-cooled connection confirmation socket is connected to the vehicle body ground platform.

[0255] The pile end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire.

[0256] The detection point is located between the fifth resistor and the first liquid cooling connection confirmation socket.

[0257] In one embodiment, the voltage at the detection point between the fifth resistor and the first liquid cooling connection confirmation socket reaches a third preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0258] In the embodiment of the present application, the fifth resistor is R5, the third voltage source is U2, and the detection point between the fifth resistor and the first liquid cooling connection confirmation socket is detection point 2 in Figure 11. For the specific process, please refer to the relevant content of Figure 11 above and will not be repeated here.

[0259] In one embodiment, the electric vehicle also includes a grounding socket, one end of the grounding socket is used to connect the grounding plug of the liquid cooling gun, and the other end of the grounding socket is connected to the vehicle body ground platform, the liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug.

[0260] The vehicle-end connection confirmation circuit includes a fifth vehicle-end connection confirmation circuit and a sixth vehicle-end connection confirmation circuit. The fifth vehicle-end connection confirmation circuit includes a fourth voltage source, the sixth vehicle-end connection confirmation circuit includes a sixth resistor, the first liquid-cooled connection confirmation socket is connected to the fourth voltage source, and the second liquid-cooled connection confirmation socket is connected to the vehicle body ground platform through the sixth resistor.

[0261] The pile end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire.

[0262] The detection point is located between the sixth resistor and the second liquid cooling connection confirmation socket.

[0263] In one embodiment, the voltage at the detection point between the sixth resistor and the second liquid cooling connection confirmation socket reaches a fourth preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0264] In the embodiment of the present application, the sixth resistor is R5', the fourth voltage source is U2, and the detection point between the sixth resistor and the second liquid cooling connection confirmation socket is detection point 3 in Figure 12. For the specific process, please refer to the relevant content of Figure 12 above and will not be repeated here.

[0265] In one embodiment, the control and guidance circuit further includes a communication circuit, the liquid cooling device further includes a communication plug, and the vehicle socket further includes a communication socket. The communication circuit includes a first communication circuit located in the liquid cooling device and a second communication circuit located in the electric vehicle, wherein one end of the first communication circuit is connected to a controller of the liquid cooling device, and the other end of the first communication circuit is connected to the communication plug, and one end of the second communication circuit is connected to a controller of the electric vehicle, and the other end of the second communication circuit is connected to the communication socket.

[0266] The communication socket and communication plug in the embodiment of the present application are the sockets and plugs corresponding to S+ and S- in Figures 4-6 and 11-12. For details, please refer to the relevant content about S+ and S- in Figure 7, which will not be repeated here.

[0267] In one embodiment, the control and guidance circuit further includes an auxiliary power circuit, the liquid cooling device further includes an auxiliary power plug, and the vehicle socket further includes an auxiliary power socket. The auxiliary power circuit includes a first auxiliary power circuit located in the liquid cooling device and a second auxiliary power circuit located in the electric vehicle. One end of the first auxiliary power circuit is connected to a controller of the liquid cooling device, and the other end of the first auxiliary power circuit is connected to the auxiliary power plug. One end of the second auxiliary power circuit is connected to a controller of the electric vehicle, and the other end of the second auxiliary power circuit is connected to the auxiliary power socket.

[0268] The auxiliary power socket and auxiliary power plug in the embodiment of the present application can refer to the design of Figure 7 and will not be described in detail.

[0269] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A control and guidance circuit for electric vehicles and liquid cooling equipment, characterized in that: The control guidance circuit includes a connection confirmation circuit, the electric vehicle includes a liquid cooling socket and a liquid cooling connection confirmation socket, and the liquid cooling device includes a liquid cooling plug and a liquid cooling connection confirmation plug; One end of the liquid cooling socket is used to connect to one end of the liquid cooling plug, the other end of the liquid cooling socket is used to connect to the thermal management system of the power battery of the electric vehicle, and the other end of the liquid cooling plug is used to receive or output cooling liquid; The connection confirmation circuit includes a vehicle-end connection confirmation circuit located at the electric vehicle and a pile-end connection confirmation circuit located at the liquid cooling device, the vehicle-end connection confirmation circuit is connected to the liquid cooling socket, and the pile-end connection confirmation circuit is connected to the liquid cooling plug; When the liquid cooling plug is connected to the liquid cooling socket, the vehicle-end connection confirmation circuit and the pile-end connection confirmation circuit form a loop, and the voltage at the detection point in the loop is used to indicate the connection status of the liquid cooling plug and the liquid cooling socket.

2. The control steering circuit according to claim 1, characterized in that: The liquid cooling device further includes a grounding plug, the electric vehicle further includes a grounding socket, one end of the grounding plug is used to connect to one end of the grounding socket, the other end of the grounding plug is used to connect to the device ground platform, the other end of the grounding socket is used to connect to the vehicle body ground platform, the liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug; The vehicle-end connection confirmation circuit includes a first vehicle-end connection confirmation circuit, the first vehicle-end connection confirmation circuit includes a first resistor and a first voltage source, and the first liquid-cooled connection confirmation socket is connected to the first voltage source through the first resistor; The pile end connection confirmation circuit includes a first pile end connection confirmation circuit, the first pile end connection confirmation circuit includes a second resistor, and the first liquid cooling connection confirmation plug is connected to the equipment ground platform through the second resistor; The detection point is located between the first liquid-cooling connection confirmation socket and the first resistor.

3. The control steering circuit according to claim 2, characterized in that: A voltage at a detection point between the first liquid-cooling connection confirmation socket and the first resistor reaches a first preset value, indicating that the liquid-cooling plug is successfully connected to the liquid-cooling socket.

4. The control steering circuit according to claim 2 or 3, characterized in that: The vehicle-end connection confirmation circuit further includes a second vehicle-end connection confirmation circuit, the second vehicle-end connection confirmation circuit includes a third resistor, and the second liquid-cooling connection confirmation socket is connected to the vehicle body ground platform through the third resistor; The pile end connection confirmation circuit further includes a second pile end connection confirmation circuit, the second pile end connection confirmation circuit includes a fourth resistor and a second voltage source, and the second liquid cooling connection confirmation plug is connected to the second voltage source through the fourth resistor; The detection point is located between the second liquid-cooling connection confirmation plug and the fourth resistor.

5. The control steering circuit according to claim 4, characterized in that: The voltage at the detection point between the first liquid cooling connection confirmation socket and the first resistor reaches a first preset value, and the voltage at the detection point between the second liquid cooling connection confirmation plug and the fourth resistor reaches a second preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

6. The control steering circuit according to claim 4 or 5, characterized in that: The second pile end connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fourth resistor and the second liquid cooling connection confirmation plug.

7. The control steering circuit according to claim 6, characterized in that: The detection point includes two detection points, one of which is located between the fourth resistor and the normally closed switch, and the other detection point is located between the second liquid cooling connection confirmation plug and the normally closed switch.

8. The control steering circuit according to claim 6 or 7, characterized in that: The voltages at the detection point between the fourth resistor and the normally closed switch and the detection point between the second liquid cooling connection confirmation plug and the normally closed switch both reach a second preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

9. The control steering circuit according to claim 1, characterized in that: The electric vehicle further comprises a grounding socket, one end of which is used to connect the grounding plug of the liquid cooling gun, and the other end of which is connected to the vehicle body ground platform, the liquid cooling connection confirmation socket comprises a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug comprises a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug; The vehicle-end connection confirmation circuit includes a third vehicle-end connection confirmation circuit and a fourth vehicle-end connection confirmation circuit, the third vehicle-end connection confirmation circuit includes a fifth resistor and a third voltage source, the first liquid-cooled connection confirmation socket is connected to the third voltage source through the fifth resistor, and the second liquid-cooled connection confirmation socket is connected to the vehicle body ground platform; The pile end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire; The detection point is located between the fifth resistor and the first liquid-cooling connection confirmation socket.

10. The control steering circuit according to claim 9, characterized in that: The voltage at the detection point between the fifth resistor and the first liquid-cooling connection confirmation socket reaches a third preset value, indicating that the liquid-cooling plug is successfully connected to the liquid-cooling socket.

11. The control steering circuit according to claim 1, characterized in that: The electric vehicle further comprises a grounding socket, one end of which is used to connect the grounding plug of the liquid cooling gun, and the other end of which is connected to the vehicle body ground platform, the liquid cooling connection confirmation socket comprises a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug comprises a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug; The vehicle-end connection confirmation circuit includes a fifth vehicle-end connection confirmation circuit and a sixth vehicle-end connection confirmation circuit, the fifth vehicle-end connection confirmation circuit includes a fourth voltage source, the sixth vehicle-end connection confirmation circuit includes a sixth resistor, the first liquid-cooled connection confirmation socket is connected to the fourth voltage source, and the second liquid-cooled connection confirmation socket is connected to the vehicle body ground platform through the sixth resistor; The pile end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire; The detection point is located between the sixth resistor and the second liquid-cooling connection confirmation socket.

12. The control steering circuit according to claim 11, characterized in that: The voltage at the detection point between the sixth resistor and the second liquid-cooling connection confirmation socket reaches a fourth preset value, indicating that the liquid-cooling plug is successfully connected to the liquid-cooling socket.

13. The control steering circuit according to any one of claims 1 to 12, characterized in that: The control pilot circuit further includes a communication circuit, the liquid cooling device further includes a communication plug, and the vehicle socket further includes a communication socket; The communication circuit includes a first communication circuit located at the liquid cooling device and a second communication circuit located at the electric vehicle, one end of the first communication circuit is connected to the controller of the liquid cooling device, the other end of the first communication circuit is connected to the communication plug, one end of the second communication circuit is connected to the controller of the electric vehicle, and the other end of the second communication circuit is connected to the communication socket.

14. The control steering circuit according to any one of claims 1 to 13, characterized in that: The control pilot circuit further includes an auxiliary power circuit, the liquid cooling device further includes an auxiliary power plug, and the vehicle socket further includes an auxiliary power socket; The auxiliary power supply circuit includes a first auxiliary power supply circuit located at the liquid cooling device and a second auxiliary power supply circuit located at the electric vehicle, one end of the first auxiliary power supply circuit is connected to the controller of the liquid cooling device, and the other end of the first auxiliary power supply circuit is connected to the auxiliary power plug, one end of the second auxiliary power supply circuit is connected to the controller of the electric vehicle, and the other end of the second auxiliary power supply circuit is connected to the auxiliary power socket.

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