Onboard charging connection apparatus, electric vehicle, liquid cooling device, and charging pile

Abstract

The invention provides an onboard charging connection apparatus, an electric vehicle, a charging connector, and a charging pile; the onboard charging connection apparatus comprises a vehicle socket and a connection confirmation circuit; and the vehicle socket comprises a direct current socket, a liquid cooling socket, and a connection confirmation socket. The onboard charging connection apparatus is used for determining, via the connection confirmation circuit, the connection state of the direct current socket with a direct current plug, and for determining the connection state of the liquid cooling socket with a liquid cooling plug; and when the liquid cooling socket is successfully connected to the liquid cooling plug and the direct current socket is successfully connected to the direct current plug, the direct current socket is used for receiving a direct current to charge a power battery. The present application can solve the problem of heat dissipation during charging of power batteries, and charging power provided by charging apparatuses to power batteries can be improved.

Description

On-board charging connection device, electric vehicle and liquid cooling equipment, charging pile

[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 202311295630.1, and priority to the Chinese patent application entitled “On-board charging connection device, electric vehicle and liquid cooling equipment, charging pile”, 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 an on-board charging connection device, an electric vehicle and liquid cooling equipment, and a charging pile. 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 provides the necessary cooling for 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 cooling needs during high-power charging.

[0005] Summary of the Invention

[0006] The present application provides an on-board charging connection device, an electric vehicle, a charging gun, and a charging pile. When the charging device performs high-power charging for the power battery of the electric vehicle, the liquid cooling device 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 improving the charging power of the charging device for the power battery.

[0007] In a first aspect, an on-board charging connection device for an electric vehicle is provided. The on-board charging connection device includes a vehicle socket and a connection confirmation circuit. The vehicle socket includes a DC socket, a liquid cooling socket, and a connection confirmation socket. One end of the DC socket is connected to the DC plug of a charging gun, and the other end of the DC socket is connected to the power battery of the electric vehicle. One end of the liquid cooling socket is connected to the liquid cooling plug of the charging gun, and the other end of the liquid cooling socket is connected to the power battery's thermal management system via a 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 connection confirmation socket is connected to the connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit. The on-board charging connection device is configured to determine the connection status between the DC socket and the DC plug, and the connection status between the liquid cooling socket and the liquid cooling plug, using the connection confirmation circuit. If the liquid cooling socket and the liquid cooling plug are successfully connected, and the DC socket and the DC plug are successfully connected, the DC socket is configured to receive DC power to charge the power battery.

[0008] The vehicle socket in the embodiment of the present application includes a connection confirmation socket. Since the connection confirmation socket is connected to the connection confirmation circuit, 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 of the detection point in the connection confirmation circuit. If 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 cools the power battery by injecting a cooling medium into the power battery, thereby solving the heat dissipation problem during power battery charging and increasing the charging power of the charging device for the power battery. In addition, the liquid-cooled socket and the charging socket in the present application are integrated into one interface. Accordingly, the charging pile only needs to be equipped with a charging gun. The user only needs to plug the gun once to achieve the cooling function when the charging pile charges the power battery, thereby improving the user experience.

[0009] In conjunction with the first aspect, in one possible design, when the liquid-cooled socket is connected to the liquid-cooled plug and the DC socket is connected to the DC plug, a connection confirmation circuit forms a current loop through the connection confirmation socket and the connection confirmation plug with the connection confirmation circuit of the charging pile. The onboard charging connection device is configured to determine the connection status of the liquid-cooled socket and the liquid-cooled plug, and the connection status of the DC socket and the DC plug, based on the voltage at a detection point in the connection confirmation circuit. In response to the voltage at the detection point reaching a preset value, the onboard charging connection device determines that the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected.

[0010] In an embodiment of the present application, the on-board charging connection device can determine the connection status of the liquid-cooled socket and the liquid-cooled plug, as well as the connection status of the DC socket and the DC plug based on the voltage at the detection point. When the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC 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.

[0011] In combination with the first aspect, in one possible design, in response to the liquid cooling socket being successfully connected to the liquid cooling plug and the DC socket being successfully connected to the DC plug, the on-board charging connection device is used to send a message indicating that the liquid cooling socket is successfully connected to the liquid cooling plug and the DC socket is successfully connected to the DC plug.

[0012] In an embodiment of the present application, the vehicle-mounted charging connection device can send a message to the charging pile indicating that the liquid-cooled socket and the liquid-cooled plug are successfully connected and the DC socket and the DC plug are successfully connected. The charging pile does not need to judge the connection status of the liquid-cooled plug and the liquid-cooled socket based on the voltage of the detection point in the connection confirmation circuit, which can improve the efficiency of the judgment.

[0013] In conjunction with the first aspect, in one possible design, the connection confirmation socket includes a first connection confirmation socket, a second connection confirmation socket, and a third connection confirmation socket; the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit; the first connection confirmation socket, the second connection confirmation socket, and the third connection confirmation socket are connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit, respectively. The onboard charging connection device is configured to determine the connection status between the DC socket and the DC plug using the first connection confirmation circuit or the second connection confirmation circuit. The onboard charging connection device is configured to determine the connection status between the liquid cooling socket and the liquid cooling plug using the third connection confirmation circuit.

[0014] In an embodiment of the present application, the vehicle-mounted charging connection device determines the connection status of the DC socket and the DC plug according to the first connection confirmation circuit or the second connection confirmation circuit, and determines the connection status of the liquid-cooled socket and the liquid-cooled plug according to the third connection confirmation circuit. The connection status of the DC socket and the DC plug, and the connection status of the liquid-cooled socket and the liquid-cooled plug can be judged separately based on different connection confirmation circuits, which can improve the accuracy of judging the connection status.

[0015] In combination with the first aspect, in a possible design, the first connection confirmation circuit includes a first resistance unit, and the first connection confirmation socket is connected to the voltage source through the first resistance unit.

[0016] In conjunction with the first aspect, in one possible design, the on-board charging connection device is configured to detect a voltage at a detection point between the first resistor unit and the first connection confirmation socket to determine a connection status between the DC socket and the DC plug. In response to the voltage at the detection point between the first resistor unit and the first connection confirmation socket reaching a first vehicle-side preset value, the on-board charging connection device determines that the DC socket and the DC plug are successfully connected.

[0017] In the embodiment of the present application, since the detection point provided herein is connected to a 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 DC socket is not connected to the DC plug. When the voltage at the detection point reaches a first vehicle-side preset value, the on-board charging connection device identifies that the DC socket is connected to the DC plug. By identifying the connection status of the DC socket and DC plug based on the voltage at the detection point, the on-board charging connection device can improve its accuracy in identifying the connection status of the DC socket and DC plug, thereby facilitating the normal charging of the power battery.

[0018] In conjunction with the first aspect, in one possible design, the vehicle socket further includes a grounding socket, one end of which is used to connect to the ground plug of the charging cable, and the other end of which is connected to the vehicle body ground platform. The second connection confirmation circuit includes a second resistor unit, and the second connection confirmation socket is connected to the vehicle body ground platform via the second resistor unit.

[0019] In conjunction with the first aspect, in one possible design, the on-board charging connection device is further configured to detect a voltage at a detection point between the second resistor unit and the second connection confirmation socket to determine the connection status between the DC socket and the DC plug. In response to the voltage at the detection point between the first resistor unit and the first connection confirmation socket reaching a first vehicle-side preset value, and the voltage at the detection point between the second resistor unit and the second connection confirmation socket reaching a second vehicle-side preset value, the on-board charging connection device determines that the DC socket and the DC plug are successfully connected.

[0020] In the embodiment of the present application, by identifying the connection status of the DC socket and the DC 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 DC socket and the DC plug can be further improved, thereby facilitating the normal charging of the power battery.

[0021] In combination with the first aspect, in a possible design, the third connection confirmation circuit includes a third resistance unit, and the third connection confirmation socket is connected to the voltage source through the third resistance unit.

[0022] In conjunction with the first aspect, in one possible design, the on-board charging connection device is configured to detect a voltage at a detection point between the third resistor unit and the third connection confirmation socket to determine a connection status between the liquid-cooling socket and the liquid-cooling plug. In response to the voltage at the detection point between the third resistor unit and the third connection confirmation socket reaching a third vehicle-side preset value, the on-board charging connection device determines that the connection between the liquid-cooling socket and the liquid-cooling plug is successful.

[0023] In the embodiment of the present application, since the detection point provided in the present application is connected to a 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 recognizes that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at the detection point reaches a third vehicle-side preset value, the on-board charging connection device recognizes 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 facilitating the liquid cooling device to transport the cooling medium in the liquid cooling system to the power battery, thereby cooling the power battery.

[0024] In combination with the first aspect, in one possible design, the vehicle socket includes a plug-in end, which is used to plug and unplug the charging gun, and the third connection confirmation socket confirms that the distance from the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end.

[0025] In an embodiment of the present application, the distance from the third 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, that is, the liquid inlet and outlet of the liquid cooling socket and the liquid inlet and outlet of the liquid cooling plug are connected first, and the third connection confirmation socket is connected to the third connection confirmation plug later, which can avoid leakage.

[0026] In combination with the first aspect, in a possible design, the distance from the third connection confirmation socket to the plug-in end is less than or equal to the distance from the second connection confirmation socket to the plug-in end.

[0027] In this embodiment of the present application, the distance from the third connection confirmation socket to the plug-in end is less than or equal to the distance from the second connection confirmation socket to the plug-in end, which is equivalent to the final complete connection confirmation by the charging station. This design can retain the existing contact coupling sequence of the vehicle socket and vehicle plug during the connection process, without changing the existing protocol. It only requires the addition of a coupling of the liquid inlet and outlet, as well as the coupling of the third connection confirmation socket and the third connection confirmation plug, which is relatively simple to implement.

[0028] In conjunction with the first aspect, in one possible design, the electric vehicle includes a traction device for pulling the charging gun to move so that the vehicle socket and the charging gun are fully connected. The distance from the third connection confirmation socket to the plug-in end is equal to the distance from the second connection confirmation socket to the plug-in end. The distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is less than the distance from the third connection confirmation socket to the plug-in end. The distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is greater than or equal to the distance from the first connection confirmation socket to the plug-in end.

[0029] In an embodiment of the present application, when the contacts of the first connection confirmation socket are connected to the contacts of the first connection confirmation plug, it indicates that the vehicle socket and the charging gun are in a semi-connected state. The traction device can pull the charging gun so that the charging gun is close to the vehicle socket, and ultimately the charging gun and the vehicle socket are in a fully connected state, eliminating the need for the user to manually push the liquid cooling gun, which can improve the user experience. In addition, the distance from the third connection confirmation socket to the plug-in end is equal to the distance from the second connection confirmation socket to the plug-in end, which facilitates the charging pile to transfer the liquid cooling medium to the thermal management system of the power battery in a timely manner and can also avoid misjudgment of the charging pile.

[0030] In combination with the first aspect, in a possible design, the vehicle socket also includes a communication socket, one end of the communication socket is used to connect to the charging gun, and the other end of the communication socket is connected to the vehicle controller of the electric vehicle.

[0031] In combination with the first aspect, in a possible design, the 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.

[0032] In combination with the first aspect, in a possible design, the DC socket is connected to the power battery through two charging circuit contactors.

[0033] In combination with the first aspect, in one possible design, 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 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 requesting the charging pile to output a second charging power, and the second charging power is less than the first charging power.

[0034] In an embodiment of the present application, the on-board charging connection device can selectively send a message to the charging pile requesting the charging pile to output different charging power according to the connection status of the liquid cooling socket and the liquid cooling plug, so as to meet the heat dissipation requirements of the power battery based on different charging power.

[0035] In a second aspect, an electric vehicle is provided, comprising an on-board charging connection device, a power battery, and a thermal management system for the power battery, the thermal management system being configured to dissipate heat from the power battery. The on-board charging connection device includes a vehicle socket and a connection confirmation circuit. The vehicle socket includes a DC socket, a liquid cooling socket, and a connection confirmation socket. One end of the DC socket is connected to the DC plug of a charging gun, and the other end is connected to the power battery. One end of the liquid cooling socket is connected to the liquid cooling plug of the charging gun, and the other end is connected to the thermal management system via a liquid cooling pipe. The liquid cooling socket is configured to receive coolant output from the liquid cooling plug, or to output coolant to the liquid cooling plug. One end of the connection confirmation socket is configured to connect to the connection confirmation plug of the charging gun, and the other end is connected to the connection confirmation circuit. The electric vehicle is configured to determine the connection status between the DC socket and the DC plug, and the connection status between the liquid cooling socket and the liquid cooling plug, using the connection confirmation circuit. If the liquid cooling socket is successfully connected to the liquid cooling plug, and the DC socket is successfully connected to the DC plug, the DC socket receives DC power to charge the power battery.

[0036] In conjunction with the second aspect, in one possible design, when the liquid-cooled socket is connected to the liquid-cooled plug and the DC socket is connected to the DC plug, a connection confirmation circuit forms a current loop through the connection confirmation socket and the connection confirmation plug with the connection confirmation circuit of the charging pile. The electric vehicle is configured to determine the connection status of the liquid-cooled socket and the liquid-cooled plug, and the connection status of the DC socket and the DC plug, based on the voltage at a detection point in the connection confirmation circuit. In response to the voltage at the detection point reaching a preset value, the electric vehicle is configured to determine that the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected.

[0037] In combination with the second aspect, in one possible design, in response to the liquid cooling socket being successfully connected to the liquid cooling plug and the DC socket being successfully connected to the DC plug, the electric vehicle is used to send a message indicating that the liquid cooling socket is successfully connected to the liquid cooling plug and the DC socket is successfully connected to the DC plug.

[0038] In conjunction with the second aspect, in one possible design, the connection confirmation socket includes a first connection confirmation socket, a second connection confirmation socket, and a third connection confirmation socket; the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit; and the first connection confirmation socket, the second connection confirmation socket, and the third connection confirmation socket are connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit, respectively. The electric vehicle is configured to determine the connection status between the DC socket and the DC plug using the first connection confirmation circuit or the second connection confirmation circuit. The electric vehicle is configured to determine the connection status between the liquid cooling socket and the liquid cooling plug using the third connection confirmation circuit.

[0039] In combination with the second aspect, in a possible design, the first connection confirmation circuit includes a first resistance unit, and the first connection confirmation socket is connected to the voltage source through the first resistance unit.

[0040] In conjunction with the second aspect, in one possible design, the electric vehicle is configured to detect a voltage at a detection point between the first resistor unit and the first connection confirmation socket to determine a connection status between the DC socket and the DC plug. In response to the voltage at the detection point between the first resistor unit and the first connection confirmation socket reaching a first vehicle-side preset value, the electric vehicle is configured to determine that the DC socket and the DC plug are successfully connected.

[0041] In conjunction with the second aspect, in one possible design, the vehicle socket further includes a grounding socket, one end of which is used to connect to the ground plug of the charging cable, and the other end of which is connected to the vehicle body ground platform. The second connection confirmation circuit includes a second resistor unit, and the second connection confirmation socket is connected to the vehicle body ground platform via the second resistor unit.

[0042] In conjunction with the second aspect, in one possible design, the electric vehicle is further configured to detect a voltage at a detection point between the second resistor unit and the second connection confirmation socket to determine a connection status between the DC socket and the DC plug. In response to the voltage at the detection point between the first resistor unit and the first connection confirmation socket reaching a first vehicle-side preset value, and the voltage at the detection point between the second resistor unit and the second connection confirmation socket reaching a second vehicle-side preset value, the electric vehicle determines that the DC socket and the DC plug are successfully connected.

[0043] In combination with the second aspect, in a possible design, the third connection confirmation circuit includes a third resistance unit, and the third connection confirmation socket is connected to the voltage source through the third resistance unit.

[0044] In conjunction with the second aspect, in one possible design, the electric vehicle is configured to detect a voltage at a detection point between the third resistor unit and the third connection confirmation socket to determine a connection status between the liquid-cooling socket and the liquid-cooling plug. In response to the voltage at the detection point between the third resistor unit and the third connection confirmation socket reaching a third vehicle-side preset value, the electric vehicle is configured to determine that the connection between the liquid-cooling socket and the liquid-cooling plug is successful.

[0045] In combination with the second aspect, in one possible design, the vehicle socket includes a plug-in end, which is used to plug and unplug the charging gun, and the third connection confirmation socket confirms that the distance from the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end.

[0046] In combination with the second aspect, in a possible design, the distance from the third connection confirmation socket to the plug-in end is less than or equal to the distance from the second connection confirmation socket to the plug-in end.

[0047] In conjunction with the second aspect, in one possible design, the electric vehicle includes a traction device for pulling the charging gun to move so that the vehicle socket and the charging gun are fully connected. The distance from the third connection confirmation socket to the plug-in end is equal to the distance from the second connection confirmation socket to the plug-in end. The distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is less than the distance from the third connection confirmation socket to the plug-in end. The distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is greater than or equal to the distance from the first connection confirmation socket to the plug-in end.

[0048] In combination with the second aspect, in a possible design, the vehicle socket also includes a communication socket, one end of the communication socket is used to connect to the charging gun, and the other end of the communication socket is connected to the vehicle controller of the electric vehicle.

[0049] In combination with the second aspect, in a possible design, the 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.

[0050] In combination with the second aspect, in a possible design, the DC socket is connected to the power battery through two charging circuit contactors.

[0051] In combination with the second aspect, in one possible design, the electric vehicle 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 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 requesting the charging pile to output a second charging power, and the second charging power is less than the first charging power.

[0052] For the beneficial effects of the second aspect, please refer to the beneficial effects of the first aspect mentioned above and will not be repeated here.

[0053] In a third aspect, a charging gun for a charging pile is provided. The charging gun includes a charging plug and a connection confirmation circuit. The charging plug includes a DC plug, a liquid cooling plug, and a connection confirmation plug. One end of the DC plug is used to connect to the DC socket of the electric vehicle, and the other end of the DC plug is used to connect to the power conversion device of the charging pile. 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 used to connect to the liquid cooling equipment of the charging pile. The liquid cooling plug is used to receive coolant output by the liquid cooling equipment. One end of the connection confirmation plug is used to connect to the connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used to connect to the connection confirmation circuit.

[0054] In combination with the third aspect, in a possible design, when the liquid-cooled plug is connected to the liquid-cooled socket and the DC plug is connected to the DC socket, the connection confirmation circuit forms a current loop through the connection confirmation plug and the connection confirmation socket with the connection confirmation circuit of the electric vehicle, and the charging pile connected to the charging gun is used to detect the voltage of the detection point in the connection confirmation circuit to determine the connection status of the DC plug and the DC socket.

[0055] In combination with the third aspect, in one possible design, the connection confirmation plug includes a first connection confirmation plug, a second connection confirmation plug, and a third connection confirmation plug, and the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit. The first connection confirmation plug, the second connection confirmation plug, and the third connection confirmation plug are respectively connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit. The first connection confirmation circuit has a fourth resistor unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the fourth resistor unit. The second connection confirmation circuit includes a fifth resistor unit, and the second connection confirmation plug is connected to the voltage source through the fifth resistor unit, and the detection point is located between the fourth resistor unit and the second connection confirmation plug. The third connection confirmation circuit includes a sixth resistor unit, and the third connection confirmation plug is connected to the device ground platform through the sixth resistor unit.

[0056] In combination with the third aspect, in a possible design, the second connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug.

[0057] In combination with the third aspect, in one possible design, the detection point includes a detection point located between the fifth resistor unit and the normally closed switch, and a detection point located between the normally closed switch and the second connection confirmation plug.

[0058] In combination with the third aspect, in one possible design, the charging plug includes a plug-in end, which is used to plug and unplug from the vehicle socket, and the distance from the third 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.

[0059] In an embodiment of the present application, the distance from the third connection confirmation plug to the plug-in end is greater than or equal to the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end, that is, the liquid inlet and outlet of the liquid cooling plug socket and the liquid inlet and outlet of the liquid cooling plug are connected first, and the third connection confirmation plug socket is connected to the third connection confirmation plug later, which can avoid leakage.

[0060] In combination with the third aspect, in a possible design, the distance from the third connection confirmation plug to the plug-in end is less than or equal to the distance from the second connection confirmation plug to the plug-in end.

[0061] In this embodiment of the present application, the distance from the third connection confirmation plug to the plug-in / plug-out end is less than or equal to the distance from the second connection confirmation plug to the plug-in / plug-out end, which is equivalent to the final complete connection confirmation by the charging station. This design can retain the existing contact coupling sequence between the vehicle socket and the vehicle plug during the connection process, without changing the existing protocol. It only requires the addition of a coupling for the liquid inlet and outlet, as well as the coupling between the third connection confirmation socket and the third connection confirmation plug, which is relatively simple to implement.

[0062] In combination with the third aspect, in one possible design, the distance from the third connection confirmation plug to the plug-in end is equal to the distance from the second connection confirmation plug to the plug-in end, the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is less than the distance from the third connection confirmation plug to the plug-in end, and the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is greater than or equal to the distance from the first connection confirmation plug to the plug-in end.

[0063] In an embodiment of the present application, when the contacts of the first connection confirmation socket are connected to the contacts of the first connection confirmation plug, it indicates that the vehicle socket and the charging gun are in a semi-connected state. The traction device can pull the charging gun so that the charging gun is close to the vehicle socket, and ultimately the charging gun and the vehicle socket are in a fully connected state, eliminating the need for the user to manually push the liquid cooling gun, which can improve the user experience. In addition, the distance from the third connection confirmation socket to the plug-in end is equal to the distance from the second connection confirmation socket to the plug-in end, which facilitates the charging pile to transfer the liquid cooling medium to the thermal management system of the power battery in a timely manner and can also avoid misjudgment of the charging pile.

[0064] In combination with the third aspect, in one possible design, the charging plug also includes a communication plug, one end of which is used to connect to the vehicle socket of the electric vehicle, and the other end of the communication plug is connected to the off-board charger controller of the charging pile.

[0065] In combination with the third aspect, in one possible design, the charging plug further includes an auxiliary power plug, one end of the auxiliary power plug is used to connect to the auxiliary power socket of the electric vehicle, and the other end of the auxiliary power plug is used to send direct current.

[0066] In combination with the third aspect, in a possible design, the DC plug is connected to the power conversion device through two DC power supply circuit contactors.

[0067] For the effective effects not described in the third aspect, please refer to the beneficial effects of the fourth aspect and no further details will be given.

[0068] In a fourth aspect, a charging pile is provided, which includes a charging gun, a liquid cooling device, and a power conversion module. The charging gun is connected to the power conversion module and the liquid cooling device. The charging gun includes a charging plug and a connection confirmation circuit. The charging plug includes a DC plug, a liquid cooling plug, and a connection confirmation plug. One end of the DC plug is used to connect to the DC socket of the electric vehicle, and the other end of the DC plug is connected to the power conversion device of the charging pile. 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 device of the charging pile. The liquid cooling plug is used to receive the coolant output by the liquid cooling device. One end of the connection confirmation plug is used to connect to the connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is connected to the connection confirmation circuit. When the liquid cooling plug is successfully connected to the liquid cooling socket and the DC plug is successfully connected to the DC socket, the DC plug sends DC power to charge the power battery.

[0069] The charging plug in the embodiment of the present application includes a connection confirmation plug. Since the connection confirmation plug is connected to the connection confirmation circuit, the charging pile can determine 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. If 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 system cools the power battery by injecting a cooling medium into the power battery, thereby solving the heat dissipation problem during power battery charging and increasing the charging power of the charging device for the power battery. In addition, the liquid cooling socket and the charging socket in the present application are integrated into a single interface. The charging pile only needs to be equipped with a charging gun. The user only needs to plug the gun once to achieve the cooling function when the charging pile charges the power battery, thereby improving the user experience.

[0070] In conjunction with the fourth aspect, in one possible design, when the liquid-cooled plug is connected to the liquid-cooled receptacle and the DC plug is connected to the DC receptacle, a connection confirmation circuit forms a current loop through the connection confirmation plug and the connection confirmation receptacle with the connection confirmation circuit of the electric vehicle. The charging pile is configured to detect the voltage at a detection point in the connection confirmation circuit to determine the connection status between the DC plug and the DC receptacle. In response to the voltage at the detection point reaching a preset value, the charging pile determines that the DC plug and the DC receptacle are successfully connected.

[0071] In the embodiment of the present application, the charging pile can judge the connection status of the liquid cooling socket and the liquid cooling plug, as well as the connection status of the DC socket and the DC plug based on the voltage of the detection point, and when the liquid cooling socket and the liquid cooling plug are successfully connected, and the DC socket and the DC 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.

[0072] In combination with the fourth aspect, in one possible design, the charging pile is used to receive a message indicating that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0073] In an embodiment of the present application, the charging pile can receive messages indicating that the liquid-cooled socket and the liquid-cooled plug are successfully connected and that the DC socket and the DC plug are successfully connected. The charging pile does not need to judge the connection status of the liquid-cooled plug and the liquid-cooled socket based on the voltage of the detection point in the connection confirmation circuit, which can improve the efficiency of judgment.

[0074] In conjunction with the fourth aspect, in one possible design, the connection confirmation plug includes a first connection confirmation plug, a second connection confirmation plug, and a third connection confirmation plug, and the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit, and the first connection confirmation plug, the second connection confirmation plug, and the third connection confirmation plug are respectively connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit. The first connection confirmation circuit has a fourth resistor unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the fourth resistor unit. The second connection confirmation circuit includes a fifth resistor unit, and the second connection confirmation plug is connected to the voltage source through the fifth resistor unit, and the detection point is located between the fifth resistor unit and the second connection confirmation plug. The third connection confirmation circuit includes a sixth resistor unit, and the third connection confirmation plug is connected to the device ground platform through the sixth resistor unit.

[0075] In conjunction with the fourth aspect, in one possible design, the charging pile is configured to determine the connection status between the DC plug and the DC outlet based on the voltage at a detection point between the fifth resistor unit and the second connection confirmation plug. In response to the voltage at the detection point between the fifth resistor unit and the second connection confirmation plug reaching a preset value at the charging pile end, the charging pile determines that the DC plug and the DC outlet are successfully connected.

[0076] In the embodiment of the present application, since the detection point provided in the present application is connected to the voltage source in the charging pile, when the voltage at the detection point is the voltage output by the voltage source, the charging pile recognizes that the DC socket is not connected to the DC plug. When the voltage at the detection point reaches a preset value at the pile end, the charging pile recognizes that the DC socket is connected to the DC plug. By identifying the connection status of the DC socket and DC plug based on the voltage at the detection point, the accuracy of the charging pile in identifying the connection status of the DC socket and DC plug can be improved, thereby facilitating the normal charging of the power battery.

[0077] In combination with the fourth aspect, in a possible design, the second connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug.

[0078] In combination with the fourth aspect, in one possible design, the detection point includes a detection point located between the fifth resistor unit and the normally closed switch, and a detection point located between the normally closed switch and the second connection confirmation plug.

[0079] In conjunction with the fourth aspect, in one possible design, the charging pile is configured to determine the connection status between the DC plug and the DC outlet based on the voltage at a detection point between the fifth resistor unit and the normally closed switch, and the voltage between the normally closed switch and the second connection confirmation plug. In response to the voltage at the detection point between the fifth resistor unit and the normally closed switch, and the voltage at the detection point between the normally closed switch and the second connection confirmation plug reaching a preset value at the charging pile end, the charging pile determines that the DC plug and the DC outlet are successfully connected.

[0080] In the embodiment of the present application, by identifying the connection status of the DC socket and the DC plug based on the voltages of the two detection points, the accuracy of the charging pile in identifying the connection status of the DC socket and the DC plug can be further improved, thereby facilitating the normal charging of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] FIG1 is a schematic structural diagram of a charging system provided in an embodiment of the present application.

[0082] FIG2 is a schematic structural diagram of another charging system provided in an embodiment of the present application.

[0083] FIG3 is a schematic diagram of a charging system provided in an embodiment of the present application.

[0084] FIG4 is a schematic diagram of another charging system provided in an embodiment of the present application.

[0085] FIG5 is a schematic diagram of another charging system provided in an embodiment of the present application.

[0086] FIG6 is a schematic diagram of another charging system provided in an embodiment of the present application.

[0087] FIG7 is a schematic diagram of a charging interface provided in an embodiment of the present application.

[0088] FIG8 is a schematic diagram of another charging interface provided in an embodiment of the present application. DETAILED DESCRIPTION

[0089] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0090] 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.

[0091] 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.

[0092] The “equal” mentioned in this application does not mean equal in a strict sense, but is within the allowable error range.

[0093] 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.

[0094] 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.

[0095] FIG1 exemplarily shows a schematic structural diagram of a charging system 10 provided in an embodiment of the present application.

[0096] 1( a ) and 1 ( b ), the charging system 10 may include a charging device 11 and a vehicle 12 .

[0097] 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.

[0098] The charging host 111 includes multiple power conversion devices 111, which can convert AC power from the external power grid 20 into stable 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.

[0099] 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 (not shown in the figure) in 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.

[0100] The charging terminal 112 may include a housing, a human-machine interface, a charging control unit, a metering and billing unit, etc. The charging terminal 112 may be used for information exchange, energy transmission, and metering and billing with the vehicle 12. A liquid cooling device may be used to cool the charging terminal. Alternatively, the liquid cooling device 112a may be independent of the charging terminal 112, as shown in Figure 2.

[0101] The electric vehicle 12 may be a vehicle powered by electricity. The electric vehicle 12 may be a new energy vehicle, such as a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), or a plug-in hybrid electric vehicle (PHEV).

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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, a power battery 320, and a thermal management system 300, and the charging pile 400 may include a charging device 410 and a liquid cooling device (not shown).

[0109] 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.

[0110] 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, and the charging device 410 may include a pile-end charging interface 411 and a liquid cooling inlet and outlet 421.

[0111] The charging port 411 and the liquid cooling inlet and outlet 421 can be integrated into a single charging gun, while the vehicle-side charging port 311 and the first liquid cooling inlet and outlet 313 can be integrated into a single vehicle interface. This allows the power battery 320 to be charged and cooled using a single charging gun. Although the charging port 411 and the liquid cooling inlet and outlet 421 are integrated into a single charging gun, during connection, the charging port 411 is still electrically connected to the vehicle-side charging port 311, while the liquid cooling inlet and outlet 421 is connected to the first liquid cooling inlet and outlet 313.

[0112] The vehicle-side charging interface 311 is electrically connected to the power battery 320 via the DC output interface 312, allowing the charging device 410 to transmit power to the power battery 320 through the vehicle-side charging connection device 310. For example, the charging device 410 can output DC power from the charging interface 411, and the vehicle-side charging connection device 310 transmits the DC power output from the 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 vehicle-side charging connection device 310 transmits 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.

[0113] 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 vehicle socket provided on the vehicle-mounted charging connection device 310.

[0114] The liquid cooling inlet and outlet 421 is 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 equipment 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.

[0115] 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. This allows the power battery 320 to be directly connected to both the charging device 410 and the liquid cooling device 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 under 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, thereby increasing the charging power of the power battery 320 and reducing the charging time of the electric vehicle.

[0116] The present application mainly relates to an interface designed in an existing charging gun for transmitting a cooling medium, that is, the charging gun in the embodiment of the present application is a liquid-cooled composite charging gun.

[0117] Figure 3 is a schematic diagram of a charging system provided in an embodiment of the present application. In conjunction with Figure 3, the charging system includes an electric vehicle 300 and a charging pile 400, and the charging pile 400 includes a charging system 440, a liquid cooling system 450 and a controller 460. Among them, the pile-end interface in Figure 3 includes the liquid cooling inlet and outlet 421 and the pile-end charging interface 411 in Figure 2. The vehicle interface includes a vehicle-end charging interface 311 and a first inlet and outlet 313. In addition, the pile-end interface may further include a connection confirmation port and a connection confirmation circuit connected to the connection confirmation port, and the vehicle interface may further include a connection confirmation port and a connection confirmation guide circuit connected to the connection confirmation port.

[0118] In one embodiment, the connection confirmation circuit in the pile-end interface can be connected to the controller 460, and the connection confirmation circuit in the pile-end interface is used by the controller 460 to identify the connection status of the charging interface and the vehicle interface. The connection confirmation circuit in the vehicle interface can be connected to the vehicle controller 340, and the connection confirmation circuit in the vehicle interface is used by the vehicle controller to identify the connection status of the vehicle interface and the charging interface.

[0119] The following will illustrate the use of on-board charging connection devices, electric vehicles and liquid cooling equipment, and charging piles as examples. It should be noted that the vehicle socket below can be understood as the vehicle interface above, and the charging plug can be understood as the pile-end interface above.

[0120] 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 vehicle socket and a connection confirmation circuit. The vehicle socket includes a DC socket, a liquid-cooled socket and a connection confirmation socket.

[0121] 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 of the electric vehicle.

[0122] One end of the liquid cooling socket is used to connect to the liquid cooling plug of the charging gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery through a 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.

[0123] One end of the connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit.

[0124] The onboard charging connection device is used to determine the connection status between the DC socket and the DC plug, as well as the connection status between the liquid cooling socket and the liquid cooling plug, through a connection confirmation circuit. If the liquid cooling socket and the liquid cooling plug are successfully connected, and the DC socket and the DC plug are successfully connected, the DC socket is used to receive DC power to charge the power battery.

[0125] The liquid cooling socket in the embodiment of the present application includes a liquid inlet and outlet, that is, 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 in the liquid cooling system of the charging pile 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. The charging socket and the liquid cooling socket in the embodiment of the present application are two different sockets, wherein the charging socket is connected to the charging plug of the charging pile. The charging socket may include a charging circuit contactor, such as K5 and K6. The charging circuit contactor can be used to disconnect or connect the power transmission circuit between the electrically connected charging socket and the power battery.

[0126] Although the liquid cooling socket and the charging socket are two different sockets, they are integrated into one interface. Correspondingly, the liquid cooling plug and the charging plug can be integrated into one charging gun.

[0127] 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. The vehicle socket in the embodiment of the present application includes a connection confirmation socket. Since the connection confirmation socket is connected to the 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 voltage of the detection point in the connection confirmation circuit. When the vehicle liquid cooling socket and the liquid cooling plug are successfully connected, when the charging pile is charging the power battery at high power, the liquid cooling system cools the power battery by injecting 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. In addition, the liquid cooling socket and the charging socket in the present application are integrated into one interface. Accordingly, the charging pile only needs to be equipped with a charging gun. The user only needs to plug the gun once to realize the cooling function when the charging pile is charging the power battery, thereby improving the user experience.

[0128] In one embodiment, when the liquid-cooled socket is connected to the liquid-cooled plug and the DC socket is connected to the DC plug, 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, and the on-board charging connection device is used to judge the connection status of the liquid-cooled socket and the liquid-cooled plug and the connection status of the DC socket and the DC plug based on the voltage of the detection point in the connection confirmation circuit.

[0129] In response to the voltage at the detection point reaching a preset value, the on-vehicle charging connection device determines that the liquid cooling socket is successfully connected to the liquid cooling plug, and the DC socket is successfully connected to the DC plug.

[0130] In an embodiment of the present application, when the liquid-cooled socket is connected to the liquid-cooled plug and the DC socket is connected to the DC plug, that is, when the vehicle socket of the on-board charging connection device is connected to the end plug of the charging pile, a 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, the on-board charging connection device determines that the vehicle socket and the end plug are successfully connected, that is, the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected.

[0131] Through this design, the on-board charging connection device can judge the connection status of the liquid cooling socket and the liquid cooling plug, as well as the connection status of the DC socket and the DC plug according to the voltage of the detection point. When the liquid cooling socket and the liquid cooling plug are successfully connected, and the DC socket and the DC 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.

[0132] The 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 4-6 below.

[0133] In one embodiment, in response to the liquid cooling socket being successfully connected to the liquid cooling plug and the DC socket being successfully connected to the DC plug, the on-board charging connection device is used to send a message indicating that the liquid cooling socket is successfully connected to the liquid cooling plug and the DC socket is successfully connected to the DC plug.

[0134] In an embodiment of the present application, when the on-board charging connection device determines that the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected, the on-board charging connection device can send a message to the charging pile, indicating that the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected. After receiving this message, the charging pile no longer needs to determine the connection status of the liquid-cooled plug and the liquid-cooled socket based on the voltage at the detection point in the connection confirmation circuit, thereby improving the efficiency of the determination.

[0135] In one embodiment, the connection confirmation socket includes a first connection confirmation socket, a second connection confirmation socket, and a third connection confirmation socket, the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit, and the first connection confirmation socket, the second connection confirmation socket, and the third connection confirmation socket are respectively connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit.

[0136] The vehicle-mounted charging connection device is used to determine the connection status between the DC socket and the DC plug through the first connection confirmation circuit or the second connection confirmation circuit. The vehicle-mounted charging connection device is used to determine the connection status between the liquid cooling socket and the liquid cooling plug through the third connection confirmation circuit.

[0137] In the embodiment of the present application, the connection confirmation socket of the vehicle-mounted charging connection device may include three connection confirmation sockets, and the three connection confirmation sockets are respectively connected to three connection confirmation circuits.

[0138] The on-board charging connection device is used to determine the connection status between the DC socket and the DC plug through two of the three connection confirmation circuits (i.e., the first connection confirmation circuit and the second connection confirmation circuit), and to determine the connection status between the liquid-cooled socket and the liquid-cooled plug through another connection confirmation circuit other than the two of the three connection confirmation circuits (i.e., the third connection confirmation circuit).

[0139] In the embodiments of the present application, the first connection confirmation socket and the second connection confirmation socket may correspond to the sockets of the CC2 port and the CC1 port, respectively. The first connection confirmation circuit is the circuit connected to the CC2 port, and the second connection confirmation circuit is the circuit connected to the CC1 port. The on-board charging connection device can determine the connection status between the DC socket and the DC plug based on the circuit connected to the CC1 port or the circuit connected to the CC2 port.

[0140] The third connection confirmation socket in the embodiment of the present application can correspond to the socket of the CC3 port, the third connection confirmation circuit is a circuit connected to the CC3 port, and the on-board charging connection device can judge the connection status of the liquid cooling socket and the liquid cooling plug based on the circuit connected to the CC3 port.

[0141] In an embodiment of the present application, the vehicle-mounted charging connection device determines the connection status of the DC socket and the DC plug according to the first connection confirmation circuit or the second connection confirmation circuit, and determines the connection status of the liquid-cooled socket and the liquid-cooled plug according to the third connection confirmation circuit. The connection status of the DC socket and the DC plug, and the connection status of the liquid-cooled socket and the liquid-cooled plug can be judged separately based on different connection confirmation circuits, which can improve the accuracy of judging the connection status.

[0142] In the present application, the connection confirmation circuit of the vehicle-mounted charging connection device can be designed in different forms. Several possible circuit design forms will be introduced below with reference to the accompanying drawings.

[0143] In one embodiment, the first connection confirmation circuit includes a first resistance unit, and the first connection confirmation socket is connected to the voltage source through the first resistance unit.

[0144] The on-board charging connection device is used to detect the voltage at the detection point between the first resistance unit and the first connection confirmation socket to determine the connection status of the DC socket and the DC plug; in response to the voltage at the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle-end preset value, the on-board charging connection device is used to determine that the DC socket and the DC plug are successfully connected.

[0145] Figure 4 shows a schematic diagram of a charging system according to an embodiment of the present application. The first resistor unit includes resistor R5, the first connection confirmation socket corresponds to port CC2, and the voltage source is U2. The detection point between the first resistor unit and the first connection confirmation socket is detection point 2.

[0146] Before the DC socket is connected to the DC 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 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. Due to the voltage divider function of the resistors, the voltage at detection point 2 will reach the first vehicle-side preset value.

[0147] 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 vehicle-mounted charging connection device recognizes that the DC socket and DC plug are successfully connected.

[0148] 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 vehicle-mounted charging connection device recognizes that the DC socket and DC plug are successfully connected.

[0149] 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 DC socket is not connected to the DC 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 DC socket is connected to the DC plug.

[0150] Figure 5 shows a schematic diagram of another charging system provided by an embodiment of the present application. The first resistor unit includes a resistor R5 and a switch S3, and the first connection confirmation socket corresponds to the CC2 port. The detection point between the first resistor unit and the first connection confirmation socket is still detection point 2. The specific determination process is similar to that in Figure 4 and will not be further described for the sake of brevity.

[0151] Figure 6 shows a schematic diagram of another charging system according to an embodiment of the present application. The first resistor unit includes a resistor R5 and a switch Sv, and the first connection confirmation socket corresponds to the CC2 port. The detection point between the first resistor unit and the first connection confirmation socket is still detection point 2. The specific determination process is similar to that in Figure 4 and will not be further described for the sake of brevity.

[0152] In the embodiment of the present application, since the detection point provided herein is connected to voltage source U2 in the electric vehicle, when the voltage at the detection point is the voltage output by voltage source U2, the on-board charging connection device recognizes that the DC socket is not connected to the DC plug. When the voltage at the detection point reaches a first vehicle-side preset value, the on-board charging connection device recognizes that the DC socket is connected to the DC plug. By identifying the connection status of the DC socket and DC plug based on the voltage at the detection point, the on-board charging connection device can improve the accuracy of identifying the connection status of the DC socket and DC plug, thereby facilitating the normal charging of the power battery.

[0153] The above embodiment illustrates that the on-board charging connection device determines that the DC socket and DC 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 of the first resistor unit and the voltage source based on the specific voltage value at detection point 2.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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 charging gun, and the other end of which is connected to a vehicle body ground platform. The second connection confirmation circuit includes a second resistor unit, and the second connection confirmation socket is connected to the vehicle body ground platform via the second resistor unit.

[0158] The vehicle-mounted charging connection device is further used to detect the voltage of a detection point between the second resistance unit and the second connection confirmation socket to determine the connection state between the DC socket and the DC plug.

[0159] In response to the voltage at the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle-end preset value, and the voltage at the detection point between the second resistance unit and the second connection confirmation socket reaching a second vehicle-end preset value, the on-board charging connection device is used to determine that the DC socket and the DC plug are successfully connected.

[0160] 5 , the second resistor unit may include R4 , R6 , and switch S2 . The second connection confirmation socket is a socket corresponding to port CC1 . The detection point between the second resistor unit and the second connection confirmation socket is detection point 3 .

[0161] Before the DC socket is connected to the DC plug, the voltage at detection point 3 should be 0V because it is connected to the vehicle's electrical platform. Only when the DC socket is connected to the DC plug, and assuming switches S1 and S2 are closed, will 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 detection point 3 will reach the second vehicle-side preset value.

[0162] 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 vehicle-mounted charging connection device recognizes that the DC socket and DC plug are successfully connected.

[0163] 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 (for example, R1 is 2Ω and R4 is 4Ω), then the second vehicle-side preset value is 8V. In this design, if the voltage at detection point 3 is 8V, the vehicle-mounted charging connection device recognizes that the DC socket and DC plug are successfully connected.

[0164] When the DC socket is connected to the DC plug, the voltages at both detection point 2 and detection point 3 should be vehicle-side preset values. Therefore, based on the analysis of detection points 2 and 3, when the voltage at detection point 3 is 0V and the voltage at detection point 2 is the voltage output by voltage source U2, the on-board charging connection device can identify that the DC socket is not connected to the DC plug. When the voltage at detection point 2 reaches a first vehicle-side preset value and the voltage at detection point 3 reaches a second vehicle-side preset value, the on-board charging connection device can identify that the DC socket is connected to the DC plug.

[0165] Referring to FIG. 6 , the second resistor unit may include R3', R4, and R4', as well as switches S2 and S2'. The second connection confirmation socket corresponds to the CC1 port. The detection point between the second resistor unit and the second connection confirmation socket remains detection point 3. The specific determination process is similar to that described in FIG. 5 and will not be further described.

[0166] In the embodiment of the present application, by identifying the connection status of the DC socket and the DC 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 DC socket and the DC plug can be further improved, thereby facilitating the normal charging of the power battery.

[0167] In one embodiment, the third connection confirmation circuit includes a third resistance unit, and the third connection confirmation socket is connected to the voltage source through the third resistance unit.

[0168] The on-board charging connection device is used to detect the voltage of the detection point between the third resistance unit and the third connection confirmation socket to determine the connection status between the liquid-cooled socket and the liquid-cooled plug; in response to the voltage of the detection point between the third resistance unit and the third connection confirmation socket reaching the third vehicle-end preset value, the on-board charging connection device is used to determine that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0169] Continuing to refer to Figure 4, the diagram shown in Figure 4 includes a third connection confirmation socket and a third connection confirmation plug, and the third connection confirmation socket is a socket corresponding to the CC3 port. The third resistor unit in the embodiment of the present application is R7, and the voltage source is still U2. The detection between the third resistor unit and the third connection confirmation socket is detection point 4. Before the liquid-cooled socket is not connected to the liquid-cooled plug, since the detection point 4 is connected to the voltage source U2, the voltage at the detection point 4 should be the voltage output by the voltage source U2. Only when the liquid-cooled socket is connected to the liquid-cooled plug, the current of the voltage source U2 forms a loop through the resistor R7 in the electric vehicle, the resistor R6 in the charging pile, and the ground wire in the charging pile. Since the detection point 4 is located between the resistor R7 and the resistor R6, due to the voltage divider function of the resistor, the voltage at the detection point 4 will reach the third vehicle-end preset value.

[0170] For example, if the output voltage of voltage source U2 is set to 12V and the resistance values ​​of R7 and R6 are equal, the third vehicle-end preset value is 6V. In this design, if the voltage at detection point 4 is 6V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0171] For another example, if the output voltage of voltage source U2 is still set to 12V, but the resistance values ​​of R7 and R6 are different, such as R7 is 2Ω and R6 is 4Ω, then the third vehicle-end preset value is 8V. In this design, if the voltage at detection point 4 is 8V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0172] Based on the above analysis, when the voltage at detection point 4 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 4 is the third vehicle-side preset value, the on-board charging connection device can identify that the liquid-cooled socket is connected to the liquid-cooled plug.

[0173] Continuing with Figure 5, the diagram shown in Figure 5 includes the third connection confirmation socket. In this embodiment, the third resistor unit is R7, the voltage source is still U2, and the detection point between the third resistor unit and the third connection confirmation socket is still detection point 4. The specific identification process is similar to that in Figure 4 and will not be repeated for the sake of brevity.

[0174] Continuing with Figure 6, the diagram shown in Figure 6 includes the third connection confirmation socket. In this embodiment, the third resistor unit is R7, the voltage source is still U2, and the detection point between the third resistor unit and the third connection confirmation socket is still detection point 4. The specific identification process is similar to that in Figure 4 and will not be repeated for the sake of brevity.

[0175] In the embodiment of the present application, since the detection point provided in the present application is connected to a 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 recognizes that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at the detection point reaches a third vehicle-side preset value, the on-board charging connection device recognizes 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 facilitating the liquid cooling device to transport the cooling medium in the liquid cooling system to the power battery, thereby cooling the power battery.

[0176] 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 4 reaches the third vehicle-side preset value. Furthermore, the on-board charging connection device can also determine the connection status between the third resistor unit and the voltage source based on the specific voltage value at detection point 4.

[0177] For example, if the contact inside the electric vehicle is good, because detection point 4 is located between resistors R6 and R7, and due to the voltage divider function of the resistors, the voltage at detection point 4 should be greater than 0 and less than the voltage source output voltage (i.e., the third vehicle-side preset value). For example, if the voltage source output voltage is 12V and the resistance values ​​of R7 and R6 are equal, the voltage at detection point 4 is 6V.

[0178] If the electric vehicle has poor internal contact, for example, if R7 is not connected to voltage source U2 and is suspended, this is equivalent to R7 and R6 being directly connected to the ground wire in the liquid cooling system. The voltage at any test point on the branch formed by resistors R7, R6, and the ground wire is 0V. Because test point 4 is located on the branch formed by resistors R7, R6, and the ground wire, the voltage at test point 4 is 0V.

[0179] 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 4, which is beneficial to improving the safety of the electric vehicle.

[0180] Based on this, the above describes different embodiments of the on-board charging connection device for determining the connection status between the DC socket and the DC plug, and 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 charging gun and the charging pile.

[0181] The present application provides a charging gun for a charging pile, the charging gun including a charging plug and a connection confirmation circuit, the charging plug including a DC plug, a liquid cooling plug and a connection confirmation plug. One end of the DC plug is used to connect to the DC socket of the electric vehicle, and the other end of the DC plug is used to connect to the power conversion device of the charging pile. 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 used to connect to the liquid cooling device of the charging pile, and the liquid cooling plug is used to receive the coolant output by the liquid cooling device. One end of the connection confirmation plug is used to connect to the connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used to connect to the connection confirmation circuit.

[0182] The present application also provides a charging pile, which includes a charging gun, a liquid cooling device and a charging device. The charging gun includes a charging plug and a connection confirmation circuit. The charging plug includes a DC plug, a liquid cooling plug and a connection confirmation plug. One end of the DC plug is used to connect to the DC socket of the electric vehicle, and the other end of the DC plug is connected to the power conversion device of the charging pile. 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 device of the charging pile. The liquid cooling plug is used to receive the coolant output by the liquid cooling device. One end of the connection confirmation plug is used to connect to the connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is connected to the connection confirmation circuit.

[0183] When the liquid cooling plug is successfully connected to the liquid cooling socket, and the DC plug is successfully connected to the DC socket, the DC plug sends DC power to charge the power battery.

[0184] The charging gun in the embodiment of the present application can also be called a liquid-cooled charging composite gun. In addition to a DC plug, the charging plug of the charging gun in the embodiment of the present application also includes a liquid-cooled plug, so that the cooling medium in the charging pile can enter the electric vehicle through the liquid-cooled plug to cool the power battery.

[0185] 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 charging gun can send DC power to charge the power battery when the liquid cooling plug is successfully connected to the liquid cooling socket, and the DC plug is successfully connected to the DC socket. When the charging pile charges the power battery at high power, the liquid cooling system cools the power battery by injecting a cooling medium into the power battery. In addition, the liquid cooling socket and the charging socket in the present application are integrated into one interface. Correspondingly, the charging pile only needs to be equipped with one charging gun. The user only needs to plug the gun once to realize the cooling function when the charging pile charges the power battery, thereby improving the user experience.

[0186] In one embodiment, for the charging gun, when the liquid-cooling plug is connected to the liquid-cooling socket and the DC plug is connected to the DC socket, the connection confirmation circuit forms a current loop through the connection confirmation plug and the connection confirmation socket with the connection confirmation circuit of the electric vehicle, and the charging pile connected to the charging gun is used to detect the voltage of the detection point in the connection confirmation circuit to determine the connection status of the DC plug and the DC socket.

[0187] For the charging pile, in response to the voltage at the detection point reaching a preset value, the charging pile determines that the DC plug is successfully connected to the DC socket.

[0188] In the embodiment of the present application, when the liquid-cooled socket is connected to the liquid-cooled plug and the DC socket is connected to the DC plug, that is, when the vehicle socket of the on-board charging connection device is connected to the charging plug of the charging device, a 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, the charging pile determines that the vehicle socket and the pile end plug are successfully connected, that is, the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected.

[0189] Through this design, the charging pile can judge the connection status of the DC socket and the DC plug according to the voltage of the detection point, and when the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC 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.

[0190] The 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 4-6 below.

[0191] In one embodiment, the charging pile is configured to receive a message indicating that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0192] In the embodiment of the present application, to determine the connection status of the liquid-cooled socket and the liquid-cooled plug, the charging pile can receive a message from the on-board charging connection device indicating that the liquid-cooled socket and the liquid-cooled plug are successfully connected. Therefore, when the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected, the liquid cooling system can cool the power battery by injecting cooling medium into the power battery when the charging pile is charging the power battery at high power, thereby meeting the power battery's heat dissipation requirements during high-power charging, thereby increasing the power battery's charging power and reducing the charging time of the electric vehicle.

[0193] The following will introduce the specific circuit form of the connection confirmation circuit and the strategy of the charging pile to determine the connection status between the DC socket and the DC plug with reference to the accompanying drawings.

[0194] In one embodiment, the connection confirmation plug includes a first connection confirmation plug, a second connection confirmation plug, and a third connection confirmation plug; the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit; the first connection confirmation plug, the second connection confirmation plug, and the third connection confirmation plug are respectively connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit.

[0195] The first connection confirmation circuit has a fourth resistor unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the fourth resistor unit.

[0196] The second connection confirmation circuit includes a fifth resistance unit, the second connection confirmation plug is connected to the voltage source through the fifth resistance unit, and the detection point is located between the fifth resistance unit and the second connection confirmation plug.

[0197] The third connection confirmation circuit includes a sixth resistor unit, and the third connection confirmation plug is connected to the device ground platform through the sixth resistor unit.

[0198] The charging pile is used to determine the connection status between the DC plug and the DC socket through the voltage of the detection point between the fifth resistor unit and the second connection confirmation plug.

[0199] In response to the voltage at the detection point between the fifth resistor unit and the second connection confirmation plug reaching the pile end preset value, the charging pile determines that the DC plug and the DC socket are successfully connected.

[0200] In the embodiment of the present application, the charging pile may use the method in the charging standard to determine the connection status of the DC plug and the DC socket.

[0201] Referring to FIG. 4 above, the fifth resistor unit in the embodiment of the present application is R1, the voltage source is still U1, and the detection between the fifth resistor unit and the second connection confirmation plug is detection point 1. Before the DC socket is connected to the DC 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 DC socket is connected to the DC 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.

[0202] 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 charging pile end is 6V. In this design, if the voltage at detection point 1 is 6V, the charging pile recognizes that the DC socket and DC plug are connected.

[0203] 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 charging station is 8V. In this design, if the voltage at detection point 1 is 8V, the charging station recognizes that the DC socket and DC plug are connected.

[0204] Based on the above analysis, when the voltage at detection point 1 is the voltage output by voltage source U1, the charging pile can identify that the DC socket is not connected to the DC plug. When the voltage at detection point 1 is the preset value at the charging pile end, the charging pile can identify that the DC socket is successfully connected to the DC plug.

[0205] 5 , the fifth resistor unit of the present embodiment includes R1, R2, and switch S1, the voltage source is still U1, and the detection point between the fifth 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.

[0206] Continuing with FIG6 , the fifth 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 fifth 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.

[0207] In the embodiment of the present application, since the detection point provided in the present application is connected to the voltage source in the charging pile, when the voltage at the detection point is the voltage output by the voltage source, the charging pile recognizes that the DC socket is not connected to the DC plug. When the voltage at the detection point reaches a preset value at the pile end, the charging pile recognizes that the DC socket is connected to the DC plug. By identifying the connection status of the DC socket and DC plug based on the voltage at the detection point, the accuracy of the charging pile in identifying the connection status of the DC socket and DC plug can be improved, thereby facilitating the normal charging of the power battery.

[0208] In one embodiment, the second connection confirmation circuit further includes a normally closed switch, which is located between the fifth resistor unit and the second connection confirmation plug. The detection point includes a detection point located between the fifth resistor unit and the normally closed switch, and a detection point located between the normally closed switch and the second connection confirmation plug.

[0209] The charging pile is used to determine the connection status between the DC plug and the DC socket through the voltage of the detection point between the fifth resistor unit and the normally closed switch, and the voltage of the detection point between the normally closed switch and the second connection confirmation plug.

[0210] In response to the voltage at the detection point between the fifth resistor unit and the normally closed switch, and the voltage at the detection point between the normally closed switch and the second connection confirmation plug reaching the pile end preset value, the charging pile determines that the DC plug and the DC socket are successfully connected.

[0211] Referring to Figure 5 above, the fifth resistance unit in the embodiment of the present application includes R1, R2 and switch S1, the normally closed switch is S, the detection point between the fifth resistance unit and the normally closed switch is detection point 1, and the detection point between the normally closed switch and the second connection confirmation plug is detection point 5.

[0212] Before the DC socket is connected to the DC 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 5 should both be the voltage output by voltage source U1. Only when the DC socket is connected to the DC 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 points 1 and 5 are both located between resistors R1 and R4, the voltages at detection points 1 and 5 will reach the preset value at the end of the pile due to the voltage divider function of the resistors. Another possible scenario is that the DC socket is connected to the DC plug, but switch S is in the open state. At this time, detection point 1 is connected to voltage source U1, and detection point 5 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 5 being 0V.

[0213] 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 both test points 1 and 5 is 6V, the DC socket and DC plug are successfully connected. If the voltage at test point 1 is 12V and the voltage at test point 5 is 0V, the DC socket and DC plug are connected but switch S is disconnected.

[0214] 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. The default value at the terminal is 8V. In this design, if the voltages at both test points 1 and 5 are 8V, the DC socket and DC plug are connected. If the voltage at test point 1 is 12V and the voltage at test point 5 is 0V, the DC socket and DC plug are connected, but switch S is disconnected.

[0215] Based on the above analysis, if the voltage at test points 1 and 5 is the voltage output by voltage source U1, the DC socket is not connected to the DC plug. If the voltage at test points 1 and 5 is the preset value at the charging terminal, the DC socket is successfully connected to the DC plug. If the voltage at test point 1 is the voltage output by voltage source U1 and the voltage at test point 5 is 0V, the DC socket is connected to the DC plug but switch S is off.

[0216] In the embodiment of the present application, the voltages at the two detection points indicate the connection status of the DC socket and the DC plug. The charging pile can determine the connection status of the DC socket and the DC plug based on the voltages at the two detection points, which can further improve the accuracy of the charging pile in determining the connection status of the DC socket and the DC plug.

[0217] Based on this, the above describes the connection confirmation circuit and how to determine the connection status between the DC socket and the DC plug, as well as the connection status between the liquid cooling socket and the liquid cooling plug, based on the connection confirmation circuit. The following describes the order in which the contacts of the plug and socket are coupled during the connection process.

[0218] In one embodiment, the vehicle socket includes a plug-in end for plugging and unplugging with the charging gun, and the distance from the third connection confirmation socket to the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end. The charging plug includes a plug-in end for plugging and unplugging with the vehicle socket, and the distance from the third 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.

[0219] In the embodiment of the present application, the distance from the third connection confirmation socket to the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end, which is equivalent to the contacts of the liquid inlet and outlet of the liquid cooling socket coupling with the contacts of the liquid inlet and outlet of the liquid cooling plug first, and the contacts of the third connection confirmation socket coupling with the contacts of the third connection confirmation plug later. In other words, the contacts of the third connection confirmation socket coupling with the contacts of the third connection confirmation plug are later than the contacts of the liquid inlet and outlet of the liquid cooling socket coupling with the contacts of the liquid inlet and outlet of the liquid cooling plug.

[0220] As shown in Figures 7 and 8, a schematic diagram of a charging interface provided in an embodiment of the present application is shown. The plug-in / plug-out end is the dotted line between the plug and socket shown in the figure. DC+ and DC- are the positive and negative DC power supply ports, PE is the ground port, CC3 is the port indicating the connection confirmation of the liquid inlet and outlet, CC1 and CC2 are the ports indicating the charging connection confirmation, S+ and S- are the charging communication ports, A+ and A- are the positive and negative ports indicating the low-voltage auxiliary power supply, and I and O are the liquid inlet and outlet, respectively.

[0221] In the embodiment of the present application, the distance from the third connection confirmation plug to the plug-in end is d3, the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is d0, and d3>d0. The distance from the third connection confirmation socket to the plug-in end is d3', the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is d0', and d3'>d0'. Based on this design, in the process of connecting the vehicle socket to the vehicle plug, the liquid inlet and outlet of the liquid cooling socket are first connected to the liquid inlet and outlet of the liquid cooling plug, and then the third connection confirmation socket is connected to the third connection confirmation plug (i.e. CC3), which is conducive to realizing that when the charging pile charges the electric vehicle at high power, the liquid cooling system under the vehicle cools the power battery. This is because if the third connection confirmation socket is connected to the third connection confirmation plug first, and the liquid inlet and outlet of the liquid cooling socket is connected to the liquid inlet and outlet of the liquid cooling plug later, it is possible that the CC3 port is already conductive, but the liquid inlet and outlet of the liquid cooling socket is not conductive with the liquid inlet and outlet of the liquid cooling plug, resulting in incorrect liquid port connection confirmation and possible water leakage.

[0222] In one embodiment, the distance from the third connection confirmation socket to the plug-in end is less than or equal to the distance from the second connection confirmation socket to the plug-in end, and the distance from the third connection confirmation plug to the plug-in end is less than or equal to the distance from the second connection confirmation plug to the plug-in end.

[0223] In the embodiment of the present application, referring to Figure 7, the distance from the second connection confirmation plug to the plug-in end is d1, the distance from the second connection confirmation socket to the plug-in end is d1', and d3≤d1, d3'≤d1'. Based on this design, in the process of connecting the vehicle socket and the vehicle plug, the contacts of the third connection confirmation socket and the contacts of the third connection confirmation plug (i.e. CC3) are connected first, and the contacts of the second connection confirmation socket and the contacts of the second connection confirmation plug (i.e. CC1) are connected later, which is equivalent to the final complete connection confirmation by the charging pile. This design can follow the coupling sequence of the contacts of the existing vehicle socket and the vehicle plug during the connection process, without changing the existing protocol. It only needs to add a coupling of the liquid inlet and outlet, and the coupling of the third connection confirmation socket and the third connection confirmation plug, which is relatively simple to implement.

[0224] It should be noted that if d3=d1 and d3'=d1' are designed, during the connection process between the vehicle socket and the vehicle plug, the third connection confirmation socket and the third connection confirmation plug (i.e. CC3) and the second connection confirmation socket and the second connection confirmation plug (i.e. CC1) are connected at the same time, which is equivalent to the final complete connection confirmation performed jointly by the charging pile and the electric vehicle.

[0225] In one embodiment, the electric vehicle includes a traction device, which is used to pull the charging gun to move so that the vehicle socket and the charging gun are fully connected.

[0226] The distance from the third connection confirmation socket to the plug-in end is equal to the distance from the second connection confirmation socket to the plug-in end, the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is less than the distance from the third connection confirmation socket to the plug-in end, and the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is greater than or equal to the distance from the first connection confirmation socket to the plug-in end.

[0227] The distance from the third connection confirmation plug to the plug-in end is equal to the distance from the second connection confirmation plug to the plug-in end, the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is less than the distance from the third connection confirmation plug to the plug-in end, and the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is greater than or equal to the distance from the first connection confirmation plug to the plug-in end.

[0228] In an embodiment of the present application, a traction device in an electric vehicle is used to pull the charging gun to move, thereby fully connecting the vehicle socket and the charging gun. In this case, when the user inserts the charging gun into the vehicle socket, the charging gun and the vehicle socket are initially in a semi-connected state. The traction device then pulls the charging gun to move, thereby fully connecting the charging gun and the vehicle socket. Because the traction device pulls the charging gun to move, thereby fully connecting the charging gun and the vehicle socket, the user no longer needs to manually push the charging gun, thereby improving the user experience.

[0229] Referring to FIG. 8, in the embodiment of the present application, the connection between the first connection confirmation socket and the first connection confirmation plug can indicate that the charging gun and the vehicle socket are in a semi-connected state. Therefore, the first connection confirmation socket and the first connection confirmation plug are connected first, that is, d2 and d2' are the shortest. The distance from the first connection confirmation plug to the plugging end is d2, and the distance from the first connection confirmation socket to the plugging end is d2'. The distance from the second connection confirmation plug to the plugging end is d1, the distance from the second connection confirmation socket to the plugging end is d1', the distance from the third connection confirmation plug to the plugging end is d3, and the distance from the third connection confirmation socket to the plugging end is d3'. And d2 ≤ d0 < d1 = d3, d2' ≤ d0' < d1' = d3'. Based on this design, during the connection process of the liquid-cooled socket and the liquid-cooled plug, the contact of the first connection confirmation socket and the contact of the first connection confirmation plug (i.e., CC2) are connected first, then the liquid inlet and outlet of the liquid-cooled socket and the liquid inlet and outlet of the liquid-cooled plug are connected, and then the contact of the second connection confirmation socket and the contact of the second connection confirmation plug (i.e., CC1), and the contact of the third connection confirmation socket and the contact of the third connection confirmation plug (i.e., CC3) are connected last. Among them, the connection between the first connection confirmation socket and the first connection confirmation plug can indicate that the charging gun and the vehicle socket are in a semi-connected state, and the connection between the second connection confirmation socket and the second connection confirmation plug, and the connection between the third connection confirmation socket and the third connection confirmation plug can indicate that the charging gun and the vehicle socket are in a fully connected state. Therefore, since d1 = d3 and d1' = d3', it is equivalent to jointly performing the final full connection confirmation by the electric vehicle and the charging pile, that is, the timing of the electric vehicle and the charging pile to judge the connection state of the liquid-cooled socket and the liquid-cooled plug is the same, which can ensure that the liquid-cooled medium is timely transmitted to the thermal management system of the power battery and can also avoid misjudgment of the charging pile.

[0230] In the embodiment of the present application, when the contact of the first connection confirmation socket and the contact of the first connection confirmation plug are connected, it indicates that the liquid-cooled socket and the liquid-cooled plug are in a semi-connected state. The traction device can traction the charging gun to move so that the charging gun approaches the vehicle socket, and finally makes the charging gun and the vehicle socket in a fully connected state, without the user manually pushing the charging 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-cooled socket and the contacts of the liquid inlet and outlet of the liquid-cooled plug are connected first, and the contact of the first connection confirmation socket and the contact of the first connection confirmation plug are connected later. The disadvantage of such a design is that the user needs to first connect the contacts of the liquid inlet and outlet of the liquid-cooled socket and the contacts of the liquid inlet and outlet of the liquid-cooled plug. However, it is difficult for the user alone to successfully connect the contacts of the liquid inlet and outlet of the liquid-cooled socket and the contacts of the liquid inlet and outlet of the liquid-cooled plug, which reduces the user experience.

[0231] In addition, in the embodiments of the present application, it is designed that the distance from the second connection confirmation socket to the plug-in end is equal to the distance from the third connection confirmation socket to the plug-in end, and the distance from the second connection confirmation plug to the plug-in end is equal to the distance from the third connection confirmation plug to the plug-in end, that is, d1 = d3 and d1' = d3'. This is because if d1 < d3 and d1' < d3' are designed, it means that the third connection confirmation socket and the third connection confirmation plug are connected first, and the second connection confirmation socket and the second connection confirmation plug are connected later. There may be a situation where the third connection confirmation socket and the third connection confirmation plug are successfully connected, but the second connection confirmation socket and the second connection confirmation plug are never connected. Based on this situation, the charging pile determines that the liquid-cooled socket and the liquid-cooled plug are not connected, and the charging pile 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.

[0232] In one embodiment, the vehicle socket further includes a communication socket. One end of the communication socket is used to connect the charging gun, and the other end of the communication socket is connected to the vehicle controller of the electric vehicle.

[0233] The charging plug further includes a communication plug. One end of the communication plug is used to connect the vehicle socket of the electric vehicle, and the other end of the communication plug is connected to the off-vehicle charger controller of the charging pile.

[0234] The communication socket and the communication plug in the embodiments of the present application are S+ and S- respectively. Referring to FIGS. 4-6 above, the communication socket is connected to the vehicle controller, and the communication plug is connected to the off-vehicle charger controller. For the content of the communication socket and the communication plug, please refer to the relevant standards and will not be elaborated here.

[0235] In one embodiment, the vehicle socket further includes an auxiliary power socket. One end of the auxiliary power socket is used to connect the auxiliary power plug of the charging gun, and the other end of the auxiliary power socket is used to receive direct current.

[0236] The charging plug further includes an auxiliary power plug. One end of the auxiliary power plug is used to connect the auxiliary power socket of the electric vehicle, and the other end of the auxiliary power plug is used to send direct current.

[0237] In the embodiments of the present application, the auxiliary power socket and the auxiliary power plug can be the sockets corresponding to A+ and A- in FIG. 7 above. For the specific description, please refer to the relevant content about A+ and A- in the charging standard and will not be elaborated here.

[0238] In one embodiment, the DC socket is connected to the power battery through two charging loop contactors. The DC plug is connected to the power conversion device through two DC power supply loop contactors.

[0239] Referring to Figures 4-6 above, the two charging circuit contactors in this embodiment of the present invention are K5 and K6, and the two DC power supply circuit contactors are K1 and K2. The two charging circuit contactors and the two DC power supply circuit contactors are used together to open or close the circuit for charging the charging pile power battery.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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, and the thermal management system is used to dissipate heat for the power battery.

[0244] The vehicle-mounted charging connection device includes a vehicle socket and a connection confirmation circuit. The vehicle socket includes a DC socket, a liquid cooling socket and a connection confirmation socket.

[0245] 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 of the electric vehicle.

[0246] One end of the liquid cooling socket is used to connect to the liquid cooling plug of the charging gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery through a 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.

[0247] One end of the connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit.

[0248] The on-board charging connection device is used to determine the connection status between the DC socket and the DC plug, as well as the connection status between the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit; when the liquid cooling socket and the liquid cooling plug are successfully connected, and the DC socket and the DC plug are successfully connected, the DC socket is used to receive DC power to charge the power battery.

[0249] The design of the connection confirmation circuit in the vehicle-mounted charging connection device and the specific identification process, etc. can all be referred to the relevant contents of Figures 4 to 6 above, and will not be repeated here.

[0250] In addition, the present application also provides a control guidance circuit applied to electric vehicles and charging piles, the control guidance circuit includes a connection confirmation circuit, the electric vehicle includes a liquid-cooled socket, a DC socket and a connection confirmation socket, and the charging pile includes a liquid-cooled plug, a DC plug and a connection confirmation plug.

[0251] 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.

[0252] One end of the DC socket is used to connect to one end of the DC plug, the other end of the DC socket is used to connect to the power battery, and the other end of the DC plug is used to connect to the power conversion device of the charging pile.

[0253] 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 charging pile. The vehicle-end connection confirmation circuit is connected to the liquid cooling socket and the DC socket, and the pile-end connection confirmation circuit is connected to the liquid cooling plug and the DC plug.

[0254] When the liquid-cooling plug is connected to the liquid-cooling socket and the DC plug is connected to the DC 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 between the liquid-cooling plug and the liquid-cooling socket and the connection status between the DC plug and the DC socket.

[0255] The liquid cooling socket in the embodiment of the present application includes a liquid inlet and a liquid outlet, that is, 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 in the liquid cooling system of the charging pile 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. The charging socket and the liquid cooling socket in the embodiment of the present application are two different sockets, wherein the charging socket is connected to the charging plug of the charging pile, and the charging socket may include a charging circuit contactor, which may be, for example, K5 and K6. The charging circuit contactor can be used to disconnect or connect the power transmission circuit between the electrically connected charging socket and the power battery.

[0256] Although the liquid cooling socket and the charging socket are two different sockets, they are integrated into one interface. Correspondingly, the liquid cooling plug and the charging plug are integrated into one charging gun.

[0257] The control guidance circuit in the embodiment of the present application can be applied to electric vehicles and charging piles. 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 charging pile. When the liquid-cooled plug is not connected to the liquid-cooled socket, and the DC plug is not connected to the DC 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 charging pile is a separate circuit. Only when the liquid-cooled plug is connected to the liquid-cooled socket and the DC plug is connected to the DC socket, the vehicle-end connection confirmation circuit located in the electric vehicle and the pile-end connection confirmation circuit located in the charging pile can form a loop.

[0258] 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 external cooling system 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 DC plug and the DC socket, as well as the connection status of the liquid cooling plug and the liquid cooling socket. Therefore, when the vehicle socket and the charging plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling system 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.

[0259] The specific circuit form of the control steering circuit will be introduced below.

[0260] In one embodiment, the charging pile 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 connection confirmation socket includes a liquid-cooled connection confirmation socket and a DC connection confirmation socket, the DC connection confirmation socket includes a first DC connection confirmation socket and a second DC connection confirmation socket, and the DC connection confirmation plug includes a first DC connection confirmation plug and a second DC connection confirmation plug.

[0261] 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 DC connection confirmation socket is connected to the first voltage source through the first resistor.

[0262] 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 DC connection confirmation plug is connected to the equipment ground platform through the second resistor.

[0263] The detection point is located between the first DC connection confirmation socket and the first resistor.

[0264] In one embodiment, a voltage at a detection point between the first DC connection confirmation socket and the first resistor reaches a first preset value, indicating that the DC plug is successfully connected to the DC socket.

[0265] 4 , the first resistor and the second resistor in the embodiment of the present application are resistors R5 and R3 respectively, the first voltage source is U2 , and the detection point between the first DC connection confirmation socket and the first resistor is detection point 2 .

[0266] Before the DC socket is connected to the DC 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 DC socket is connected to the DC plug will first 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 preset value.

[0267] For example, if the voltage output by 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 the detection point 2 is 6 V, it means that the DC socket and the DC plug are connected.

[0268] 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 means that the DC socket and DC plug are successfully connected.

[0269] Therefore, based on the above analysis, when the voltage at detection point 2 is the voltage output by the first voltage source U2, it indicates that the DC socket is not connected to the DC plug. When the voltage at detection point 2 reaches the first preset value, it indicates that the DC socket is successfully connected to the DC plug.

[0270] 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 DC socket is not connected to the DC plug. When the voltage at the detection point reaches a first preset value, it indicates that the DC socket is connected to the DC plug. The voltage at the detection point can indicate the connection status of the DC socket and the DC plug. The electric vehicle determines the connection status of the DC socket and the DC plug based on the voltage at the detection point, which can improve the accuracy of the electric vehicle's determination of the connection status of the DC socket and the DC plug, thereby facilitating the normal charging of the power battery.

[0271] In one embodiment, the electric vehicle also includes a grounding socket, one end of the grounding socket is used to connect to the grounding plug of the charging pile, and the other end of the grounding socket is connected to the vehicle body ground platform. The vehicle-end connection confirmation circuit also includes a second vehicle-end connection confirmation circuit, and the second vehicle-end connection confirmation circuit includes a third resistor. The second DC connection confirmation socket is connected to the vehicle body ground platform through the third resistor.

[0272] 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 DC connection confirmation plug is connected to the second voltage source via the fourth resistor.

[0273] The detection point is located between the second DC connection confirmation plug and the fourth resistor.

[0274] In one embodiment, the voltage at the detection point between the first DC connection confirmation socket and the first resistor reaches a first preset value, and the voltage at the detection point between the second DC connection confirmation plug and the fourth resistor reaches a second preset value, indicating that the DC plug and the DC socket are successfully connected.

[0275] Referring to Figure 4 above, the third and fourth resistors in the embodiment of the present application are R4 and R1, respectively, the second voltage source is U1, and the detection point between the second DC connection confirmation plug and the fourth resistor is detection point 1. Before the DC socket is connected to the DC plug, since detection point 1 is connected to the second voltage source U1, the voltage at detection point 1 should be the voltage output by second voltage source U1. Only when the DC socket is connected to the DC plug does the current from second 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. Because detection point 1 is located between resistors R1 and R4, the voltage at detection point 1 will reach the second preset value due to the voltage divider function of the resistors.

[0276] For example, if the output voltage of the second voltage source U1 is set to 12 V and the resistance values ​​of R1 and R4 are equal, the first preset value is 6 V. In this design, if the voltage at detection point 1 is 6 V, it means that the DC socket and the DC plug are connected.

[0277] For another example, if the output voltage of the second 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 preset value is 8V. In this design, if the voltage at detection point 1 is 8V, it indicates that the DC socket and DC plug are successfully connected.

[0278] Based on the above analysis, when the voltage at detection point 1 is the voltage output by the second voltage source U1, it indicates that the DC socket is not connected to the DC plug. When the voltage at detection point 1 is the first preset value, it indicates that the DC socket is successfully connected to the DC plug.

[0279] In the embodiment of the present application, since the detection point provided in the present application is connected to the second voltage source in the charging pile, when the voltage at the detection point is the voltage output by the second voltage source, it indicates that the DC socket is not connected to the DC plug. When the voltage at the detection point reaches a second preset value, it indicates that the DC socket is connected to the DC plug. The voltages at the two detection points can indicate the connection status of the DC socket and the DC plug. The electric vehicle and the charging pile can determine the connection status of the DC socket and the DC plug based on the voltages at the two detection points. This can improve the accuracy of the electric vehicle and the charging pile in determining the connection status of the DC socket and the DC plug, thereby facilitating the normal charging of the power battery.

[0280] In one embodiment, the second pile terminal connection confirmation circuit further includes a normally closed switch, which is located between the fourth resistor and the second DC connection confirmation plug. The detection points include 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 DC connection confirmation plug and the normally closed switch.

[0281] In one embodiment, the voltages at the two detection points reach a second preset value, indicating that the DC liquid cooling plug is successfully connected to the DC socket.

[0282] Referring to Figure 5, the fourth resistor in the embodiment of the present application is R1, the normally closed switch is S, the second voltage source is still U1, the detection point between the fourth resistor and the normally closed switch is detection point 1, and the detection point between the second DC connection confirmation plug and the normally closed switch is detection point 5.

[0283] Before the DC socket is connected to the DC plug, since detection point 1 is connected to the second voltage source U1 and switch S is a normally closed switch, the voltages at detection points 1 and 5 should both be the voltage output by second voltage source U1. Only when the DC socket is connected to the DC plug does the current from second 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 points 1 and 5 are both located between resistors R1 and R4, the voltages at detection points 1 and 5 will reach the second preset value due to the voltage divider function of the resistors. Another possible scenario is that the DC socket is connected to the DC plug, but switch S is in the open state. In this case, detection point 1 is connected to the second voltage source U1, and detection point 5 is connected to the ground wire in the electric vehicle, resulting in the voltage at detection point 1 being the voltage output by second voltage source U1 and the voltage at detection point 5 being 0V.

[0284] For example, if the output voltage of the second voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the second preset value is 6V. In this design, if the voltage at both test points 1 and 5 is 6V, the DC socket and DC plug are successfully connected. If the voltage at test point 1 is 12V and the voltage at test point 5 is 0V, the DC socket and DC plug are connected, but switch S is disconnected.

[0285] For another example, if the output voltage of the second 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 preset value is 8V. In this design, if the voltage at detection point 1 and detection point 5 is both 8V, it indicates that the DC socket and DC plug are connected. If the voltage at detection point 1 is 12V and the voltage at detection point 5 is 0V, it indicates that the DC socket and DC plug are connected, but switch S is disconnected.

[0286] Based on the above analysis, when the voltages at test points 1 and 5 are the voltages output by the second voltage source U1, the DC socket is not connected to the DC plug. When the voltages at test points 1 and 5 are the second preset value, the DC socket is successfully connected to the DC plug. When the voltage at test point 1 is the voltage output by the second voltage source U1 and the voltage at test point 5 is 0V, the DC socket is connected to the DC plug but switch S is off.

[0287] In the embodiment of the present application, the voltages at the two detection points indicate the connection status of the DC socket and the DC plug. The charging pile can determine the connection status of the DC socket and the DC plug based on the voltages at the two detection points, which can further improve the accuracy of the charging pile in determining the connection status of the DC socket and the DC plug.

[0288] In one embodiment, the vehicle-side connection confirmation circuit further includes a third vehicle-side connection confirmation circuit, the third vehicle-side connection confirmation circuit including a fifth resistor and a first voltage source, and the liquid cooling connection confirmation socket is connected to the first voltage source via the fifth resistor. The pile-side connection confirmation circuit further includes a third pile-side connection confirmation circuit, the third pile-side connection confirmation circuit including a sixth resistor, and the liquid cooling connection confirmation plug is connected to the device ground platform via the sixth resistor. The detection point is located between the liquid cooling connection confirmation socket and the fifth resistor.

[0289] In one embodiment, the voltage at the detection point between the liquid cooling connection confirmation socket and the fifth resistor reaches a third preset value, indicating that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0290] Continuing with reference to Figure 4 , the fifth and sixth resistors in the embodiment of the present application are R7 and R6, and the first voltage source in the electric vehicle remains U2. The detection point between the liquid-cooling connection confirmation socket and the fifth resistor is detection point 4. Before the liquid-cooling socket is connected to the liquid-cooling plug, since detection point 4 is connected to the first voltage source U2, the voltage at detection point 4 should be the voltage output by first voltage source U2. Only when the liquid-cooling socket is connected to the liquid-cooling plug does the current from first 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 4 is located between resistors R7 and R6, the voltage at detection point 4 will reach the third preset value due to the voltage divider function of the resistors.

[0291] For example, if the output voltage of the first 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 the detection point 4 is 6 V, it means that the liquid cooling socket and the liquid cooling plug are connected.

[0292] For another example, if the output voltage of the first voltage source U2 is still set to 12V, but the resistance values ​​of R7 and R6 are different, such as R7 is 2Ω and R6 is 4Ω, then the third preset value is 8V. In this design, if the voltage at detection point 4 is 8V, it indicates that the liquid cooling socket and liquid cooling plug are connected.

[0293] Based on the above analysis, when the voltage at detection point 4 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 4 is the third preset value, it indicates that the liquid cooling socket is successfully connected to the liquid cooling plug.

[0294] Continuing to refer to FIG. 5 and FIG. 6 , the third connection confirmation loop shown in FIG. 5 and FIG. 6 is similar to that in FIG. 4 , and the specific identification process is similar to that in FIG. 4 , which will not be described again for the sake of brevity.

[0295] 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 third preset value, 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. The electric vehicle judges the connection status of the liquid cooling socket and the liquid cooling plug based on the voltage at the detection point, which can improve the accuracy of the electric vehicle in judging the connection status of the liquid cooling socket and the liquid cooling plug. Thus, 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.

[0296] In one embodiment, the control and guidance circuit further includes a communication circuit, the charging pile 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 charging pile and a second communication circuit located at the electric vehicle, one end of the first communication circuit being connected to the controller of the charging pile, the other end of the first communication circuit being connected to the communication plug, one end of the second communication circuit being connected to the controller of the electric vehicle, and the other end of the second communication circuit being connected to the communication socket.

[0297] In one embodiment, the control and guidance circuit further includes an auxiliary power circuit, the charging pile 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 at the charging pile and a second auxiliary power circuit located at the electric vehicle, one end of the first auxiliary power circuit being connected to the controller of the charging pile, and the other end of the first auxiliary power circuit being connected to the auxiliary power plug, one end of the second auxiliary power circuit being connected to the controller of the electric vehicle, and the other end of the second auxiliary power circuit being connected to the auxiliary power socket.

[0298] Regarding the design of the communication circuit and the auxiliary power supply circuit, please refer to the relevant contents of Figures 4 to 6 and will not be repeated here.

[0299] 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 vehicle-mounted charging connection device for an electric vehicle, characterized in that: The vehicle-mounted charging connection device comprises a vehicle socket and a connection confirmation circuit, wherein the vehicle socket comprises a DC socket, a liquid cooling socket and a 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 of the electric vehicle; One end of the liquid cooling socket is used to connect to the liquid cooling plug of the charging gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery through a 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; One end of the connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit; The vehicle-mounted charging connection device is used to determine the connection status between the DC socket and the DC plug, and determine the connection status between the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit; When the liquid cooling socket is successfully connected to the liquid cooling plug, and the DC socket is successfully connected to the DC plug, the DC socket is used to receive DC power to charge the power battery.

2. The vehicle-mounted charging connection device according to claim 1, characterized in that: When the liquid-cooling socket is connected to the liquid-cooling plug and the DC socket is connected to the DC plug, the connection confirmation circuit forms a current loop with the connection confirmation circuit of the charging pile through the connection confirmation socket and the connection confirmation plug, and the on-board charging connection device is used to judge the connection state of the liquid-cooling socket and the liquid-cooling plug and the connection state of the DC socket and the DC plug according to the voltage of the detection point in the connection confirmation circuit; In response to the voltage at the detection point reaching a preset value, the on-vehicle charging connection device determines that the liquid cooling socket is successfully connected to the liquid cooling plug, and the DC socket is successfully connected to the DC plug.

3. The vehicle-mounted charging connection device according to claim 2, characterized in that: In response to the liquid cooling socket being successfully connected to the liquid cooling plug and the DC socket being successfully connected to the DC plug, the on-board charging connection device is used to send a message indicating that the liquid cooling socket is successfully connected to the liquid cooling plug and the DC socket is successfully connected to the DC plug.

4. The vehicle-mounted charging connection device according to any one of claims 1 to 3, characterized in that: The connection confirmation socket includes a first connection confirmation socket, a second connection confirmation socket, and a third connection confirmation socket, the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit, and the first connection confirmation socket, the second connection confirmation socket, and the third connection confirmation socket are connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit respectively; The vehicle-mounted charging connection device is used to determine the connection status between the DC socket and the DC plug through the first connection confirmation circuit or the second connection confirmation circuit; The vehicle-mounted charging connection device is used to determine the connection status between the liquid cooling socket and the liquid cooling plug through the third connection confirmation circuit.

5. The vehicle-mounted charging connection device according to claim 4, characterized in that: The first connection confirmation circuit includes a first resistance unit, and the first connection confirmation socket is connected to a voltage source through the first resistance unit.

6. The vehicle-mounted charging connection device according to claim 5, characterized in that: The vehicle-mounted charging connection device is used to detect the voltage of the detection point between the first resistance unit and the first connection confirmation socket to determine the connection state between the DC socket and the DC plug: In response to the voltage at the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle-end preset value, the vehicle-mounted charging connection device is used to determine that the DC socket is successfully connected to the DC plug.

7. The vehicle-mounted charging connection device according to claim 5 or 6, characterized in that: The vehicle socket further includes a grounding socket, one end of which is used to connect to the grounding plug of the charging gun, and the other end of which is connected to the vehicle body ground platform; The second connection confirmation circuit includes a second resistance unit, and the second connection confirmation socket is connected to the vehicle body ground platform through the second resistance unit.

8. The vehicle-mounted charging connection device according to claim 7, characterized in that: The vehicle-mounted charging connection device is also used to detect the voltage of a detection point between the second resistance unit and the second connection confirmation socket to determine the connection state between the DC socket and the DC plug; In response to a voltage at a detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle-end preset value, and The voltage at the detection point between the second resistance unit and the second connection confirmation socket reaches a second vehicle-end preset value, and the vehicle-mounted charging connection device is used to determine that the DC socket is successfully connected to the DC plug.

9. The vehicle-mounted charging connection device according to any one of claims 4 to 8, characterized in that: The third connection confirmation circuit includes a third resistance unit, and the third connection confirmation socket is connected to a voltage source through the third resistance unit.

10. The vehicle-mounted charging connection device according to claim 9, characterized in that: The vehicle-mounted charging connection device is used to detect the voltage of a detection point between the third resistance unit and the third connection confirmation socket to determine the connection state between the liquid cooling socket and the liquid cooling plug; In response to the voltage at the detection point between the third resistance unit and the third connection confirmation socket reaching a third vehicle-end preset value, the on-board charging connection device is used to determine that the liquid cooling socket is successfully connected to the liquid cooling plug.

11. The vehicle-mounted charging connection device according to any one of claims 4 to 10, characterized in that: The vehicle socket includes a plug-in end, which is used to plug and unplug the charging gun, and the distance from the third connection confirmation socket to the plug-in end is greater than the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end.

12. The vehicle-mounted charging connection device according to claim 11, characterized in that: The distance from the third connection confirmation socket to the plugging end is less than or equal to the distance from the second connection confirmation socket to the plugging end.

13. The vehicle-mounted charging connection device according to claim 11, characterized in that: The electric vehicle comprises a traction device, which is used to pull the charging gun to move so that the vehicle socket and the charging gun are fully connected; The distance from the third connection confirmation socket to the plug-in end is equal to the distance from the second connection confirmation socket to the plug-in end, the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is less than the distance from the third connection confirmation socket to the plug-in end, and the distance from the liquid inlet and outlet of the liquid cooling socket to the plug-in end is greater than or equal to the distance from the first connection confirmation socket to the plug-in end.

14. The vehicle-mounted charging connection device according to any one of claims 1 to 13, characterized in that: The vehicle socket also includes a communication socket, one end of which is used to connect to the charging gun, and the other end of which is connected to a vehicle controller of the electric vehicle.

15. The vehicle-mounted charging connection device according to any one of claims 1 to 14, characterized in that: The vehicle socket also includes an auxiliary power socket, one end of which is used to connect to an auxiliary power plug of the charging gun, and the other end of which is used to receive direct current.

16. The vehicle-mounted charging connection device according to any one of claims 1 to 15, characterized in that: The DC socket is connected to the power battery via two charging circuit contactors.

17. The vehicle-mounted charging connection device according to any one of claims 1 to 16, characterized in that: The vehicle-mounted charging connection device is used for: When the liquid cooling socket is successfully connected to the liquid cooling plug, and the DC socket is successfully connected to the DC plug, a message for requesting the charging pile to output a first charging power is sent to the charging pile; or, When the DC socket is successfully connected to the DC plug, a message for requesting the charging pile to output a second charging power is sent to the charging pile, and the second charging power is less than the first charging power.

18. An electric vehicle, characterized in that: It comprises an on-vehicle charging connection device as described in any one of claims 1 to 17, a power battery and a thermal management system, wherein the thermal management system is used to dissipate heat for the power battery.

19. A charging gun used in a charging pile, characterized in that: The charging gun includes a charging plug and a connection confirmation circuit, and the charging plug includes a DC plug, a liquid cooling plug and a connection confirmation plug; One end of the DC plug is used to connect to the DC socket of the electric vehicle, and the other end of the DC plug is used to connect to the power conversion device of the charging pile; 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 used to connect to the liquid cooling device of the charging pile, and the liquid cooling plug is used to receive the coolant output by the liquid cooling device; One end of the connection confirmation plug is used to connect to the connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used to connect to the connection confirmation circuit.

20. The charging gun according to claim 19, characterized in that: When the liquid-cooling plug is connected to the liquid-cooling socket and the DC plug is connected to the DC socket, the connection confirmation circuit forms a current loop with the connection confirmation circuit of the electric vehicle through the connection confirmation plug and the connection confirmation socket, and the charging pile connected to the charging gun is used to detect the voltage of the detection point in the connection confirmation circuit to determine the connection status of the DC plug and the DC socket.

21. The charging gun according to claim 19 or 20, characterized in that: The connection confirmation plug includes a first connection confirmation plug, a second connection confirmation plug, and a third connection confirmation plug, the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit, the first connection confirmation plug, the second connection confirmation plug, and the third connection confirmation plug are connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit respectively; The first connection confirmation circuit includes a fourth resistance unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the fourth resistance unit; The second connection confirmation circuit comprises a fifth resistance unit, the second connection confirmation plug is connected to a voltage source through the fifth resistance unit, and the detection point is located between the fifth resistance unit and the second connection confirmation plug; The third connection confirmation circuit includes a sixth resistance unit, and the third connection confirmation plug is connected to the device ground platform through the sixth resistance unit.

22. The charging gun according to claim 21, characterized in that: The second connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug.

23. The charging gun according to claim 22, characterized in that: The detection points include a detection point located between the fifth resistance unit and the normally closed switch, and a detection point located between the normally closed switch and the second connection confirmation plug.

24. The charging gun according to any one of claims 21 to 23, characterized in that: The charging plug includes a plug-in end, which is used to be plugged in and out of the vehicle socket, and the distance from the third 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.

25. The charging gun according to any one of claims 21 to 24, characterized in that: The distance from the third connection confirmation plug to the plugging end is less than or equal to the distance from the second connection confirmation plug to the plugging end.

26. The charging gun according to any one of claims 21 to 24, characterized in that: The distance from the third connection confirmation plug to the plug-in end is equal to the distance from the second connection confirmation plug to the plug-in end, the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is less than the distance from the third connection confirmation plug to the plug-in end, and the distance from the liquid inlet and outlet of the liquid cooling plug to the plug-in end is greater than or equal to the distance from the first connection confirmation plug to the plug-in end.

27. The charging gun according to any one of claims 19 to 26, characterized in that: The charging plug also includes a communication plug, one end of which is used to connect to the vehicle socket of the electric vehicle, and the other end of which is connected to the controller of the charging pile.

28. The charging gun according to any one of claims 19 to 27, characterized in that: The charging plug also includes an auxiliary power plug, one end of which is used to connect to an auxiliary power socket of the electric vehicle, and the other end of which is used to send direct current.

29. The charging gun according to any one of claims 19 to 28, characterized in that: The DC plug is connected to the power conversion device via two DC power supply circuit contactors.

30. A charging pile, characterized in that: The charging pile includes a charging gun, a liquid cooling device and a power conversion module, the charging gun is connected to the power conversion module and the liquid cooling device, the charging gun includes a charging plug and a connection confirmation circuit, and the charging plug includes a DC plug, a liquid cooling plug and a connection confirmation plug; One end of the DC plug is used to connect to the DC socket of the electric vehicle, and the other end of the DC plug is connected to the power conversion device of the charging pile; 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 device of the charging pile, and the liquid cooling plug is used to receive the coolant output by the liquid cooling device; One end of the connection confirmation plug is used to connect to the connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is connected to the connection confirmation circuit; When the liquid cooling plug is successfully connected to the liquid cooling socket, and the DC plug is successfully connected to the DC socket, the DC plug sends DC power to charge the power battery.

31. The charging pile according to claim 30, characterized in that: When the liquid-cooling plug is connected to the liquid-cooling socket and the DC plug is connected to the DC socket, the connection confirmation circuit forms a current loop with the connection confirmation circuit of the electric vehicle through the connection confirmation plug and the connection confirmation socket, and the charging pile is used to detect the voltage of the detection point in the connection confirmation circuit to determine the connection state of the DC plug and the DC socket; In response to the voltage at the detection point reaching a preset value, the charging pile determines that the DC plug is successfully connected to the DC socket.

32. The charging pile according to claim 30 or 31, characterized in that: The charging pile is used to receive a message indicating that the liquid cooling socket is successfully connected to the liquid cooling plug.

33. The charging pile according to any one of claims 30 to 32, characterized in that: The connection confirmation plug includes a first connection confirmation plug, a second connection confirmation plug, and a third connection confirmation plug, the connection confirmation circuit includes a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit, the first connection confirmation plug, the second connection confirmation plug, and the third connection confirmation plug are connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit respectively; The first connection confirmation circuit has a fourth resistor unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the fourth resistor unit; The second connection confirmation circuit comprises a fifth resistance unit, the second connection confirmation plug is connected to a voltage source through the fifth resistance unit, and the detection point is located between the fifth resistance unit and the second connection confirmation plug; The third connection confirmation circuit includes a sixth resistance unit, and the third connection confirmation plug is connected to the device ground platform through the sixth resistance unit.

34. The charging pile according to claim 33, characterized in that: The charging pile is used to determine the connection state between the DC plug and the DC socket through the voltage of the detection point between the fifth resistance unit and the second connection confirmation plug; In response to the voltage at the detection point between the fifth resistance unit and the second connection confirmation plug reaching a pile end preset value, the charging pile determines that the DC plug and the DC socket are successfully connected.

35. The charging pile according to claim 33 or 34, characterized in that: The second connection confirmation circuit further includes a normally closed switch, and the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug.

36. The charging pile according to claim 35, characterized in that: The detection points include a detection point located between the fifth resistance unit and the normally closed switch, and a detection point located between the normally closed switch and the second connection confirmation plug.

37. The charging pile according to claim 35 or 36, characterized in that: The charging pile is used to determine the connection state between the DC plug and the DC socket through the voltage of the detection point between the fifth resistance unit and the normally closed switch, and the voltage between the normally closed switch and the second connection confirmation plug; In response to the voltage at the detection point between the fifth resistance unit and the normally closed switch, and the voltage at the detection point between the normally closed switch and the second connection confirmation plug reaching a preset value at the pile end, the charging pile is used to determine that the DC plug and the DC socket are successfully connected.

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