Vehicle charging connection device, electric vehicle and liquid cooling device, charging pile

Abstract

The application provides a vehicle-mounted charging connection device, an electric vehicle and a charging gun and a charging pile. The vehicle-mounted charging connection device comprises a vehicle socket and a connection confirmation circuit. The vehicle socket comprises a direct-current socket, a liquid-cooled socket and a connection confirmation socket. The vehicle-mounted charging connection device is used for judging the connection state of the direct-current socket and a direct-current plug and the connection state of the liquid-cooled socket and a liquid-cooled plug through the connection confirmation circuit. In the case that the liquid-cooled socket and the liquid-cooled plug are successfully connected and the direct-current socket and the direct-current plug are successfully connected, the direct-current socket is used for receiving direct-current power to charge a power battery. The application can solve the heat dissipation problem during power battery charging and improve the charging power of the charging device for the power battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicles, in particular to a vehicle-mounted charging connection device, an electric vehicle, a liquid cooling device and a charging pile. BACKGROUND

[0002] With the breakthrough of high-power battery charging technology, it is possible to fully charge the battery in a short time. However, in the current actual application, when the charging device charges the power battery at high power, the heat generated by the power battery increases significantly. If these heat cannot be removed in time, it will affect the normal charging of the power battery by the charging device.

[0003] Electric vehicles generally have a set of thermal management systems that can provide the required cooling capacity for the heat dissipation of the power battery. However, as the charging power increases, for example in the supercharging scenario, the heat generated by the power battery is increasing, and the effect of heat dissipation by relying on the thermal management system alone is limited, and the heat dissipation capacity of the thermal management system cannot meet the heat dissipation needs of the power battery during high-power charging. SUMMARY

[0004] The present application provides a vehicle-mounted charging connection device, an electric vehicle, a charging gun and a charging pile. When the charging device charges the power battery of the electric vehicle at high power, the liquid cooling device can deliver cooling liquid to the thermal management system of the power battery, thereby solving the heat dissipation problem of the power battery during charging and improving the charging power of the charging device for the power battery.

[0005] In a first aspect, a vehicle-mounted charging connection device applied to an electric vehicle is provided, characterized in that the vehicle-mounted charging connection device comprises a vehicle socket and a connection confirmation circuit, the vehicle socket comprises a direct current socket, a liquid cooling socket and a connection confirmation socket. One end of the direct current socket is used for connecting a direct current plug of a charging gun, and the other end of the direct current socket is connected to a power battery of the electric vehicle. One end of the liquid cooling socket is used for connecting a liquid cooling plug of the charging gun, and the other end of the liquid cooling socket is connected to a thermal management system of the power battery through a liquid cooling pipeline. The liquid cooling socket is used for receiving cooling liquid output by the liquid cooling plug, or the liquid cooling socket is used for outputting cooling liquid to the liquid cooling plug. One end of the connection confirmation socket is used for connecting a 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 for judging the connection state of the direct current socket and the direct current plug and judging the connection state of the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit; in the case that the liquid cooling socket and the liquid cooling plug are successfully connected and the direct current socket and the direct current plug are successfully connected, the direct current socket is used for receiving direct current to charge the power battery.

[0006] The vehicle socket in this embodiment includes a connection confirmation socket. Since the connection confirmation socket is connected to a 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 at the detection point in the connection confirmation circuit. When the liquid-cooled socket and liquid-cooled plug are successfully connected, the liquid cooling system cools the power battery by injecting a cooling medium into the power battery when the charging pile charges it at high power. This solves the heat dissipation problem during power battery charging and improves the charging power of the charging device. Furthermore, the liquid-cooled socket and charging socket in this application are integrated into a single interface. Correspondingly, the charging pile only needs to be equipped with one charging gun, and the user only needs to plug in the gun once to achieve the cooling function when the power battery is charged at the charging pile, improving the user experience.

[0007] In conjunction with the first aspect, in one possible design, when the liquid-cooled socket and liquid-cooled plug are connected, and the DC socket and DC plug are connected, the connection confirmation circuit forms a current loop through the connection confirmation socket and connection confirmation plug and the connection confirmation circuit of the charging pile. The on-board charging connection device is used to determine the connection status of the liquid-cooled socket and liquid-cooled plug, and the connection status of the DC socket and DC plug, based on the voltage at the detection point in the connection confirmation circuit. In response to the voltage at the detection point reaching a preset value, the on-board charging connection device determines that the liquid-cooled socket and liquid-cooled plug are successfully connected, and the DC socket and DC plug are successfully connected.

[0008] In this embodiment, 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, the liquid cooling system can cool the power battery by injecting a cooling medium into the power battery. This can meet 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.

[0009] In conjunction with the first aspect, in one possible design, in response to a successful connection between the liquid-cooled socket and the liquid-cooled plug, and a successful connection between the DC socket and the DC plug, the on-board charging connection device is used to send a message 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.

[0010] In this embodiment, the vehicle-mounted charging connection device can send a message to the charging pile that the liquid-cooled socket and liquid-cooled plug are successfully connected and the DC socket and DC plug are successfully connected. The charging pile does not need to determine the connection status of the liquid-cooled plug and liquid-cooled socket based on the voltage of the detection point in the connection confirmation circuit, which can improve the efficiency of the determination.

[0011] With reference to the first aspect, in a 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 vehicle charging connection device is configured to determine the connection state of the DC socket and the DC plug by using the first connection confirmation circuit or the second connection confirmation circuit. The vehicle charging connection device is configured to determine the connection state of the liquid cooling socket and the liquid cooling plug by using the third connection confirmation circuit.

[0012] In the embodiments of this application, the vehicle charging connection device determines the connection state of the DC socket and the DC plug by using the first connection confirmation circuit or the second connection confirmation circuit, and determines the connection state of the liquid cooling socket and the liquid cooling plug by using the third connection confirmation circuit. Different connection confirmation circuits can be used to determine the connection state of the DC socket and the DC plug and the connection state of the liquid cooling socket and the liquid cooling plug respectively, which can improve the accuracy of determining the connection state.

[0013] With reference to 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.

[0014] With reference to the first aspect, in a possible design, the vehicle charging connection device is configured to determine the connection state of the DC socket and the DC plug by detecting the voltage of the detection point between the first resistance unit and the first connection confirmation socket. In response to the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle end preset value, the vehicle charging connection device is configured to determine that the DC socket and the DC plug are successfully connected.

[0015] In the embodiments of this application, since the detection point is connected to the voltage source in the electric vehicle, when the voltage of the detection point is the voltage output by the voltage source, the vehicle charging connection device identifies that the DC socket is not connected to the DC plug. When the voltage of the detection point reaches the first vehicle end preset value, the vehicle charging connection device identifies that the DC socket is connected to the DC plug. By identifying the connection state of the DC socket and the DC plug according to the voltage of the detection point, the accuracy of identifying the connection state of the DC socket and the DC plug by the vehicle charging connection device can be improved, thereby facilitating the normal charging of the power battery.

[0016] With reference to the first aspect, in a possible design, the vehicle socket further includes a grounding socket, one end of the grounding socket is configured to be connected to a grounding plug of the charging gun, and the other end of the grounding socket is connected to a 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.

[0017] With reference to the first aspect, in a possible design, the vehicle-mounted charging connection device is further configured to detect a voltage of a detection point between the second resistance unit and the second connection confirmation socket to determine a connection state of the DC socket and the DC plug. In response to the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle-end preset value, and the voltage of the detection point between the second resistance unit and the second connection confirmation socket reaching a second vehicle-end preset value, the vehicle-mounted charging connection device is configured to determine that the DC socket and the DC plug are successfully connected.

[0018] In the embodiments of this application, the connection state of the DC socket and the DC plug can be identified according to the voltages of the two detection points, so that the accuracy of identifying the connection state of the DC socket and the DC plug by the vehicle-mounted charging connection device can be further improved, thereby facilitating the normal charging of the power battery.

[0019] With reference to 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.

[0020] With reference to the first aspect, in a possible design, the vehicle-mounted charging connection device is configured to detect a voltage of a detection point between the third resistance unit and the third connection confirmation socket to determine a connection state 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 a third vehicle-end preset value, the vehicle-mounted charging connection device is configured to determine that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0021] In the embodiments of this application, since the detection point is connected to the voltage source in the electric vehicle, when the voltage of the detection point is the voltage output by the voltage source, the vehicle-mounted charging connection device identifies that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage of the detection point reaches the third vehicle-end preset value, the vehicle-mounted charging connection device identifies that the liquid-cooled socket is connected to the liquid-cooled plug. The connection state of the liquid-cooled socket and the liquid-cooled plug can be identified according to the voltage of the detection point, so that the accuracy of identifying the connection state of the liquid-cooled socket and the liquid-cooled plug by the vehicle-mounted charging connection device can be improved, thereby facilitating the liquid-cooled device to deliver the cooling medium in the liquid-cooled system to the power battery to cool the power battery.

[0022] With reference to the first aspect, in a possible design, the vehicle socket includes a plug end configured to be plugged with the charging gun, and a distance from the third connection confirmation socket to the plug end is greater than a distance from the liquid inlet / outlet of the liquid-cooled socket to the plug end.

[0023] In the embodiments of the present application, the distance from the third connection confirmation socket to the plug end is greater than or equal to the distance from the liquid inlet and outlet of the liquid cooling socket to the plug 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 and the third connection confirmation plug are connected later, which can avoid the liquid leakage.

[0024] In combination with the first aspect, in a possible design, the distance from the third connection confirmation socket to the plug end is less than or equal to the distance from the second connection confirmation socket to the plug end.

[0025] In the embodiments of the present application, the distance from the third connection confirmation socket to the plug end is less than or equal to the distance from the second connection confirmation socket to the plug end, which is equivalent to the final complete connection confirmation by the charging pile. This design can follow the existing coupling sequence of the contacts of the vehicle socket and the vehicle plug during the connection process, does not need to change the existing protocol, and only needs to add a coupling of the liquid inlet and outlet and a coupling of the third connection confirmation socket and the third connection confirmation plug, which is relatively simple.

[0026] In combination with the first aspect, in a possible design, the electric vehicle includes a traction device, the traction device is used to pull the charging gun to move so that the vehicle socket and the charging gun are completely connected. The distance from the third connection confirmation socket to the plug end is equal to the distance from the second connection confirmation socket to the plug end, the distance from the liquid inlet and outlet of the liquid cooling socket to the plug end is less than the distance from the third connection confirmation socket to the plug end, and the distance from the liquid inlet and outlet of the liquid cooling socket to the plug end is greater than or equal to the distance from the first connection confirmation socket to the plug end.

[0027] In the embodiments of the present application, when the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug are connected, it is indicated that the vehicle socket and the charging gun are in a semi-connected state. The traction device can pull the charging gun to move so that the charging gun is close to the vehicle socket, and finally the charging gun and the vehicle socket are in a completely connected state, without 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 end is equal to the distance from the second connection confirmation socket to the plug end, which is conducive to the charging pile to timely transmit the liquid cooling medium to the thermal management system of the power battery, and can also avoid the misjudgment of the charging pile.

[0028] In combination with the first aspect, in a possible design, 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.

[0029] In combination with the first aspect, in a possible design, 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.

[0030] With reference to the first aspect, in a possible design, the DC socket is connected to the power battery through two charging circuit contactors.

[0031] With reference to the first aspect, in a possible design, the vehicle-mounted charging connection device is configured to: send, when the liquid-cooled socket is successfully connected to the liquid-cooled plug and the DC socket is successfully connected to the DC plug, a message to the charging pile for requesting the charging pile to output a first charging power; or send, when the DC socket is successfully connected to the DC plug, a message to the charging pile for requesting the charging pile to output a second charging power, the second charging power being less than the first charging power.

[0032] In the embodiments of this application, the vehicle-mounted charging connection device can selectively send messages to the charging pile for requesting the charging pile to output different charging powers according to the connection state of the liquid-cooled socket and the liquid-cooled plug, so as to meet the heat dissipation requirement of the power battery based on different charging powers.

[0033] The second aspect provides an electric vehicle, including a vehicle-mounted charging connection device, a power battery, and a heat management system of the power battery, the heat management system being configured to dissipate heat for the power battery. The vehicle-mounted charging connection device includes a vehicle socket and a connection confirmation circuit, the vehicle socket including a DC socket, a liquid-cooled socket, and a connection confirmation socket. One end of the DC socket is configured to connect to a DC plug of a charging gun, and the other end of the DC socket is connected to the power battery. One end of the liquid-cooled socket is configured to connect to a liquid-cooled plug of the charging gun, and the other end of the liquid-cooled socket is connected to the heat management system through a liquid-cooled pipeline, the liquid-cooled socket being configured to receive cooling liquid output by the liquid-cooled plug or output cooling liquid to the liquid-cooled plug. One end of the connection confirmation socket is configured to connect to a connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit. The electric vehicle is configured to determine the connection state of the DC socket and the DC plug and determine the connection state of the liquid-cooled socket and the liquid-cooled plug through the connection confirmation circuit. When the liquid-cooled socket is successfully connected to the liquid-cooled plug and the DC socket is successfully connected to the DC plug, the DC socket is configured to receive DC power to charge the power battery.

[0034] With reference to the second aspect, in a possible design, 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 with a connection confirmation circuit of the charging pile through the connection confirmation socket and the connection confirmation plug, and the electric vehicle is configured to determine the connection state of the liquid-cooled socket and the liquid-cooled plug and the connection state of the DC socket and the DC plug according to the voltage of a detection point in the connection confirmation circuit. In response to the voltage of the detection point reaching a preset value, the electric vehicle is configured to determine that the liquid-cooled socket is successfully connected to the liquid-cooled plug and the DC socket is successfully connected to the DC plug.

[0035] With reference to the second aspect, in a possible design, in response to the liquid cooling socket being successfully connected with the liquid cooling plug and the DC socket being successfully connected with the DC plug, the electric vehicle is configured to send a message indicating that the liquid cooling socket is successfully connected with the liquid cooling plug and the DC socket is successfully connected with the DC plug.

[0036] With reference to the second aspect, in a 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 with 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 state of the DC socket and the DC plug by using the first connection confirmation circuit or the second connection confirmation circuit. The electric vehicle is configured to determine the connection state of the liquid cooling socket and the liquid cooling plug by using the third connection confirmation circuit.

[0037] With reference to 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 with the voltage source through the first resistance unit.

[0038] With reference to the second aspect, in a possible design, the electric vehicle is configured to detect the voltage of a detection point between the first resistance unit and the first connection confirmation socket to determine the connection state of the DC socket and the DC plug. In response to the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle-end preset value, the electric vehicle is configured to determine that the DC socket is successfully connected with the DC plug.

[0039] With reference to the second aspect, in a possible design, the vehicle socket further includes a grounding socket, one end of the grounding socket is configured to be connected with a grounding plug of the charging gun, and the other end of the grounding socket is connected with a vehicle body ground platform. The second connection confirmation circuit includes a second resistance unit, and the second connection confirmation socket is connected with the vehicle body ground platform through the second resistance unit.

[0040] With reference to the second aspect, in a possible design, the electric vehicle is further configured to detect the voltage of a detection point between the second resistance unit and the second connection confirmation socket to determine the connection state of the DC socket and the DC plug. In response to the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaching the first vehicle-end preset value, and the voltage of the detection point between the second resistance unit and the second connection confirmation socket reaching a second vehicle-end preset value, the electric vehicle is configured to determine that the DC socket is successfully connected with the DC plug.

[0041] With reference to 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 with the voltage source through the third resistance unit.

[0042] With reference to the second aspect, in a possible design, the electric vehicle is configured to detect a voltage at a detection point between the third resistance unit and the third connection confirmation socket to determine a 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 preset value at the vehicle end, the electric vehicle is configured to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0043] With reference to the second aspect, in a possible design, the vehicle socket comprises a plug end configured to be plugged with the charging gun, and a distance from the third connection confirmation socket to the plug end is greater than a distance from the liquid inlet / outlet of the liquid cooling socket to the plug end.

[0044] With reference to the second aspect, in a possible design, a distance from the third connection confirmation socket to the plug end is less than or equal to a distance from the second connection confirmation socket to the plug end.

[0045] With reference to the second aspect, in a possible design, the electric vehicle comprises a traction device configured to move the charging gun to make the vehicle socket and the charging gun fully connected. The distance from the third connection confirmation socket to the plug end is equal to the distance from the second connection confirmation socket to the plug end, the distance from the liquid inlet / outlet of the liquid cooling socket to the plug end is less than the distance from the third connection confirmation socket to the plug end, and the distance from the liquid inlet / outlet of the liquid cooling socket to the plug end is greater than or equal to the distance from the first connection confirmation socket to the plug end.

[0046] With reference to the second aspect, in a possible design, the vehicle socket further comprises a communication socket, one end of the communication socket being configured to be connected with the charging gun, and the other end of the communication socket being connected with a vehicle controller of the electric vehicle.

[0047] With reference to the second aspect, in a possible design, the vehicle socket further comprises an auxiliary power socket, one end of the auxiliary power socket being configured to be connected with an auxiliary power plug of the charging gun, and the other end of the auxiliary power socket being configured to receive direct current.

[0048] With reference to the second aspect, in a possible design, the direct current socket is connected with the power battery through two charging loop contactors.

[0049] With reference to the second aspect, in a possible design, the electric vehicle is configured to: in response to the liquid cooling socket and the liquid cooling plug being successfully connected and the direct current socket and the direct current plug being successfully connected, send, to the charging pile, a message for requesting the charging pile to output a first charging power; or in response to the direct current socket and the direct current plug being successfully connected, send, to the charging pile, a message for requesting the charging pile to output a second charging power, the second charging power being less than the first charging power.

[0050] The beneficial effects of the second aspect can refer to those of the first aspect, which will not be repeated here.

[0051] In a third aspect, a charging gun applied to a charging pile is provided. The charging gun comprises a charging plug and a connection confirmation circuit. The charging plug comprises a DC plug, a liquid cooling plug and a connection confirmation plug. One end of the DC plug is used to connect a DC socket of an electric vehicle, and the other end of the DC plug is used to connect a power conversion device of the charging pile. One end of the liquid cooling plug is used to connect a liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is used to connect a liquid cooling device of the charging pile. The liquid cooling plug is used to receive cooling liquid output by the liquid cooling device. One end of the connection confirmation plug is used to connect a connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used to connect the connection confirmation circuit.

[0052] In combination with the third aspect, in a possible design, when the liquid cooling plug is connected with the liquid cooling socket and the DC plug is connected with 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. The charging pile connected by the charging gun 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.

[0053] In combination with the third aspect, in a possible design, the connection confirmation plug comprises a first connection confirmation plug, a second connection confirmation plug and a third connection confirmation plug, and the connection confirmation circuit comprises 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 with the first connection confirmation circuit, the second connection confirmation circuit and the third connection confirmation circuit respectively. The first connection confirmation circuit comprises a fourth resistance unit, and the first connection confirmation plug is connected with a device ground platform of the charging pile through the fourth resistance unit. The second connection confirmation circuit comprises a fifth resistance unit, and the second connection confirmation plug is connected with a voltage source through the fifth resistance unit. The detection point is located between the fourth resistance unit and the second connection confirmation plug. The third connection confirmation circuit comprises a sixth resistance unit, and the third connection confirmation plug is connected with the device ground platform through the sixth resistance unit.

[0054] In combination with the third aspect, in a possible design, the second connection confirmation circuit further comprises a normally closed switch, and the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug.

[0055] In combination with the third aspect, in a possible design, the detection point comprises 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.

[0056] In combination with the third aspect, in a possible design, the charging plug comprises a plug end, the plug end is used to be plugged with the vehicle socket, and the distance from the third connection confirmation plug to the plug end is greater than the distance from the liquid inlet / outlet of the liquid cooling plug to the plug end.

[0057] In the embodiments of the present application, the distance from the third connection confirmation plug to the plug end is greater than or equal to the distance from the liquid inlet and outlet of the liquid cooling plug to the plug end, that is, the liquid inlet and outlet of the liquid cooling plug seat and the liquid inlet and outlet of the liquid cooling plug are connected first, and the third connection confirmation plug seat and the third connection confirmation plug are connected later, which can avoid the situation of liquid leakage.

[0058] In combination with the third aspect, in a possible design, the distance from the third connection confirmation plug to the plug end is less than or equal to the distance from the second connection confirmation plug to the plug end.

[0059] In the embodiments of the present application, the distance from the third connection confirmation plug to the plug end is less than or equal to the distance from the second connection confirmation plug to the plug end, which is equivalent to the final complete connection confirmation by the charging pile. This design can follow the existing coupling sequence of the contacts of the vehicle socket and the vehicle plug in the connection process, does not need to change the existing protocol, and only needs to add a coupling of the liquid inlet and outlet and a coupling of the third connection confirmation socket and the third connection confirmation plug, which is relatively simple.

[0060] In combination with the third aspect, in a possible design, the distance from the third connection confirmation plug to the plug end is equal to the distance from the second connection confirmation plug to the plug end, the distance from the liquid inlet and outlet of the liquid cooling plug to the plug end is less than the distance from the third connection confirmation plug to the plug end, and the distance from the liquid inlet and outlet of the liquid cooling plug to the plug end is greater than or equal to the distance from the first connection confirmation plug to the plug end.

[0061] In the embodiments of the present application, when the contact of the first connection confirmation socket is connected with the contact of the first connection confirmation plug, it is indicated that the vehicle socket and the charging gun are in a semi-connected state. The traction device can pull the charging gun to move so that the charging gun is close to the vehicle socket, and finally the charging gun and the vehicle socket are in a completely connected state, without 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 end is equal to the distance from the second connection confirmation socket to the plug end, which is beneficial to the charging pile to timely transmit the liquid cooling medium to the thermal management system of the power battery, and can also avoid the misjudgment of the charging pile.

[0062] In combination with the third aspect, in a possible design, the charging plug further includes a communication plug, one end of the communication plug is used for connecting the vehicle socket of the electric vehicle, and the other end of the communication plug is connected with the non-vehicle-mounted charger controller of the charging pile.

[0063] In combination with the third aspect, in a possible design, the charging plug further includes an auxiliary power plug, one end of the auxiliary power plug is used for connecting the auxiliary power socket of the electric vehicle, and the other end of the auxiliary power plug is used for transmitting direct current.

[0064] With reference to the third aspect, in a possible design, the DC plug is connected to the power conversion device through the two DC power supply loop contactors.

[0065] For the beneficial effects not described in the third aspect, refer to the beneficial effects of the fourth aspect, which will not be repeated here.

[0066] In the 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, 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 cooling liquid 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. In the case that 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.

[0067] The charging plug in the embodiments 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 state of the liquid cooling socket and the liquid cooling plug according to the voltage of the detection point in the connection confirmation circuit. In the case that the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging pile charges the power battery at a high power, the liquid cooling system cools the power battery by injecting cooling medium into the power battery, thereby solving the heat dissipation problem of the power battery during 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 in one interface, and the charging pile only needs to be configured with one charging gun. The user only needs to plug in the gun once to realize the cooling function of the power battery during charging in the charging pile, thereby improving the user experience.

[0068] With reference to the fourth aspect, in a possible design, in the case that 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. 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 of the detection point reaching a preset value, the charging pile determines that the DC plug and the DC socket are successfully connected.

[0069] In the embodiments of the present application, the charging pile can determine 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. 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 liquid cooling system can cool the power battery by injecting cooling medium into the power battery when the charging pile charges the power battery at high power, so as to meet the heat dissipation requirement of the power battery during high-power charging, improve the charging power of the power battery, and shorten the charging time of the electric vehicle.

[0070] In combination with the fourth aspect, in a possible design, the charging pile is configured to receive a message indicating that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0071] In the embodiments of the present application, the charging pile can receive a message indicating that the liquid cooling socket and the liquid cooling plug are successfully connected and the DC socket and the DC plug are successfully connected. The charging pile does not need to determine the connection state of the liquid cooling plug and the liquid cooling socket according to the voltage of the detection point in the connection confirmation circuit, which can improve the efficiency of determination.

[0072] In combination with the fourth aspect, in a 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 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 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. 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.

[0073] In combination with the fourth aspect, in a possible design, the charging pile is configured to determine the connection state between the DC plug and the DC socket by the voltage of the detection point between the fifth resistor unit and the second connection confirmation plug. In response to the voltage of the detection point between the fifth resistor unit and the second connection confirmation plug reaching a preset value at the end of the pile, the charging pile determines that the DC plug and the DC socket are successfully connected.

[0074] In the embodiment of the application, since the detection point is connected with 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 identifies that the DC socket is not connected with the DC plug. When the voltage at the detection point reaches the preset value at the pile end, the charging pile identifies that the DC socket is connected with the DC plug. By identifying the connection state of the DC socket and the DC plug according to the voltage at the detection point, the accuracy of the charging pile in identifying the connection state of the DC socket and the DC plug can be improved, thereby facilitating the normal charging of the power battery.

[0075] With reference to 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.

[0076] With reference to the fourth aspect, in a possible design, 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.

[0077] With reference to the fourth aspect, in a possible design, the charging pile is configured to determine the connection state between the DC plug and the DC socket by the voltage at 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 the preset value at the pile end, the charging pile is configured to determine that the DC plug and the DC socket are successfully connected.

[0078] In the embodiment of the application, by identifying the connection state of the DC socket and the DC plug according to the voltage at the two detection points, the accuracy of the charging pile in identifying the connection state of the DC socket and the DC plug can be further improved, thereby facilitating the normal charging of the power battery. BRIEF DESCRIPTION OF DRAWINGS

[0079] Figure 1 A structural schematic diagram of a charging system provided by an embodiment of the application.

[0080] Figure 2 A structural schematic diagram of another charging system provided by an embodiment of the application.

[0081] Figure 3 A structural schematic diagram of a charging system provided by an embodiment of the application.

[0082] Figure 4 A structural schematic diagram of another charging system provided by an embodiment of the application.

[0083] Figure 5 A structural schematic diagram of another charging system provided by an embodiment of the application.

[0084] Figure 6 Another schematic diagram of a charging system provided by an embodiment of the present application.

[0085] Figure 7 A schematic diagram of a charging interface provided by an embodiment of the present application.

[0086] Figure 8 Another schematic diagram of a charging interface provided by an embodiment of the present application. DETAILED DESCRIPTION

[0087] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0088] 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 the present application only means a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone.

[0089] In the present specification, the reference "some embodiments" and the like means that a specific feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Therefore, the statements "in some embodiments" and the like appearing in various places in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprise", "include", "have" and their conjugates mean "including but not limited to", unless otherwise specifically emphasized.

[0090] The "equal to" involved in the present application is not a strict sense of equal to, but within the allowable range of error.

[0091] With the development of new energy automobile technology, many automobile manufacturers gradually put forward electric vehicles. Electric vehicles become the choice of many users because of their energy saving, environmental protection and relatively mature technology.

[0092] The present application can be applied to a system in which a power supply device and a load are charged through a power distribution matrix. Especially for a system including a charging pile and an electric vehicle, the charging pile can use the electric energy from the power grid to charge the electric vehicle, and the electric vehicle can also output its own electric energy to the power grid in reverse.

[0093] Figure 1 An exemplary structure schematic diagram of a charging system 10 provided by an embodiment of the present application is shown.

[0094] In combination with Figure 1 (a) and Figure 1(b) in FIG. 1, the charging system 10 can include a charging device 11 and a vehicle 12.

[0095] In some embodiments, as shown in (a) in FIG. 1, the charging device 11 can be a split 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, each charging terminal 112 is electrically connected to the charging gun 113 through a cable, and the charging gun 113 is used to be electrically connected to the electric vehicle 12. Figure 1

[0096] The charging host 111 includes a plurality of power conversion devices 111, which can convert alternating current from the external power grid 20 into stable direct current and then deliver it to the charging terminal 112, and then to the electric vehicle 12 through the charging gun 113 electrically connected to the charging terminal 112. The plurality of power conversion devices can include, for example, alternating current-direct current (AC-DC) conversion devices and direct current-direct current (DC-DC) conversion devices.

[0097] In a specific implementation, a user can insert the charging gun 113 into the charging interface of the electric vehicle 12 to electrically connect the charging gun 113 with the power battery (not shown in the figure) in the electric vehicle 12, and the charging host 111 can in turn charge the power battery of the electric vehicle 12 through the charging gun 113.

[0098] The charging terminal 112 can include a shell, a human-computer interaction interface, a charging control unit, a metering and charging unit, etc., and can be used for information interaction, energy transmission, metering and charging, etc. with the vehicle 12. The liquid cooling device can cool the charging terminal. Alternatively, the liquid cooling device 112a can also be independent of the charging terminal 112, as shown in (b) in FIG. 1. Figure 2

[0099] ​​Electric vehicle 12 can be a means of transportation powered by electricity. Electric vehicle 12 can be a new energy vehicle, which can be a pure electric vehicle (battery 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), etc.

[0100] In other embodiments, such as Figure 1 As shown in (b), the charging device 11 can be an integrated charging device. Specifically, the charging device 11 may only include a charging host 111 and at least one charging gun 113 electrically connected to the charging host 111, without including the charging terminal 112. The human-machine interface, charging control unit, and metering and billing unit can be directly installed in the charging host 111. Multiple power conversion devices in the charging host 111 convert the AC power from the external power grid 20 into stable DC power, which is then directly delivered to the electric vehicle 12 through the charging gun 113.

[0101] In the aforementioned charging system 10, breakthroughs in high-power battery charging technology enable a rapid full charge of the battery. However, in current practical applications, when the charging device 11 charges the power battery at high power, the heat generated by the power battery increases significantly. If this heat cannot be dissipated in time, it will affect the normal operation of the high-power charging process performed by the charging device 11.

[0102] Electric vehicles typically come equipped with a thermal management system to dissipate heat from the battery. However, with increasing charging power, such as in supercharging scenarios, the heat generated by the battery is growing significantly. The effectiveness of relying solely on the thermal management system for heat dissipation is limited, and its cooling capacity is no longer sufficient to meet the heat dissipation requirements of the battery during high-power charging.

[0103] Currently, although the power battery can be cooled by an external cooling system, the connection port of the external cooling system is only a single inlet and outlet. When the charging pile charges 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.

[0104] Based on this, the application provides a charging system, which comprises a charging pile and an electric vehicle. The charging pile comprises a charging device and a liquid cooling device. When the charging device performs high-power charging on the power battery of the electric vehicle, the liquid cooling device can deliver cooling liquid to the thermal management system of the power battery, thereby solving the heat dissipation problem of the power battery during charging and improving the charging power of the charging device on the power battery.

[0105] Figure 2 is a structural schematic diagram of a charging system 200 provided by an embodiment of the application. It should be understood that, Figure 2 The power transmission line is represented by a thin solid line, and the pipeline connection line is represented by a short dashed line.

[0106] The charging system 200 can comprise an electric vehicle 300 and a charging pile 400. The electric vehicle 300 can comprise an on-board charging connection device 310, a power battery 320 and a thermal management system 300, and the charging pile 400 can comprise a charging device 410 and a liquid cooling device (not shown in the figure).

[0107] It can be understood that the electric vehicle 300 can be Figure 1 the electric vehicle 12 shown in FIG. 1, and the charging device 410 can be Figure 1 the split charging device shown in (a) of FIG. 2, or Figure 1 the integrated charging device shown in (b) of FIG. 2. For the convenience of description and understanding, the charging device 410 is taken as the split charging device shown in (a) of FIG. 2 for description. Figure 1

[0108] Continuing to refer to Figure 2 , the on-board charging connection device 310 can comprise a vehicle-end charging interface 311, a direct-current output interface 312, a first liquid inlet and outlet 313 and a second liquid inlet and outlet 314, and the charging device 410 can comprise a pile-end charging interface 411 and a liquid cooling liquid inlet and outlet 421.

[0109] The pile-end charging interface 411 and the liquid cooling liquid inlet and outlet 421 can be integrated in one charging gun, and the vehicle-end charging interface 311 and the first liquid inlet and outlet 313 can be integrated in one vehicle interface, so that the charging and cooling of the power battery 320 can be realized through the one charging gun. Although the pile-end charging interface 411 and the liquid cooling liquid inlet and outlet 421 are integrated in one charging gun, when connected, the pile-end charging interface 411 is still used for electrical connection with the vehicle-end charging interface 311, and the liquid cooling liquid inlet and outlet 421 is connected with the first liquid inlet and outlet 313.

[0110] ​The vehicle-side charging interface 311 is electrically connected with the power battery 320 through the direct-current output interface 312, so that the charging device 410 can perform power transmission with the power battery 320 through the vehicle-mounted charging connection device 310. For example, the charging device 410 can output direct-current electricity from the pile-side charging interface 411, and the vehicle-mounted charging connection device 310 can transmit the direct-current electricity output by the charging device 410 from the pile-side charging interface 411 to the power battery 320 through the direct-current output interface 312, so as to charge the power battery 320. Alternatively, the power battery 320 can output direct-current electricity to the direct-current output interface 312, and the vehicle-mounted charging connection device 310 can transmit the direct-current electricity output by the power battery 320 to the charging device 410 through the vehicle-side charging interface 311, so as to realize discharging of the power battery 320 to the charging device 410.

[0111] In some embodiments, the number of pile-side charging interfaces 411 and vehicle-side charging interfaces 311 can be one or more, respectively. In a specific implementation, as shown in FIG. 4, the split charging device 410 can include a charging host 412 and at least one charging terminal 413 electrically connected with the charging host 412. Each charging terminal 413 can be electrically connected with a charging gun (not shown in the figure) through a cable, the pile-side charging interface 411 can be a charging plug arranged in each charging gun, and the vehicle-side charging interface 311 can be a vehicle socket arranged on the vehicle-mounted charging connection device 310. Figure 2

[0112] The liquid cooling inlet and outlet 421 is used to be connected with the first inlet and outlet 313, and the first inlet and outlet 313 can be connected with the power battery 320 through the second inlet and outlet 314, so that the liquid cooling device can transmit liquid-phase cooling medium to the power battery 320 through the vehicle-mounted charging connection device 310, to realize cooling of the power battery 320.

[0113] In the embodiments of the present application, by arranging a separate vehicle-mounted charging connection device 310 in the electric vehicle 300, the vehicle-mounted charging connection device 310 has a vehicle-side charging interface 311 for electrically connecting with the charging device 410, and a first inlet and outlet 313 connected with the liquid cooling device, so that the power battery 320 can be directly connected with the charging device 410 and the liquid cooling device through the vehicle-mounted charging connection device 310. In this way, when the power battery is charged by the charging device 410 at a high power, the liquid cooling device under the vehicle can be connected with the power battery 320, so as to meet the heat dissipation requirement of the power battery 320 when being charged at a high power, and facilitate to improve the charging power of the power battery 320 and reduce the charging time of the electric vehicle.

[0114] The present application mainly relates to designing an interface for transmitting cooling medium in the existing charging gun, that is, the charging gun in the embodiments of the present application is a liquid-cooled charging composite gun. ​

[0115] Figure 3 A charging system schematic diagram is provided for the embodiments of the present application. In combination Figure 3 , the charging system includes an electric vehicle 300 and a charging pile 400, the charging pile 400 includes a charging system 440, a liquid cooling system 450 and a controller 460. Wherein, Figure 3 The pile end interface in the charging system 440 includes Figure 2 The liquid cooling inlet and outlet 421 and the pile end charging interface 411 in the charging system 440. The vehicle interface includes the vehicle end charging interface 311 and the first liquid inlet and outlet 313. In addition, the pile end interface can also include a connection confirmation port and a connection confirmation circuit connected to the connection confirmation port, and the vehicle interface can also include a connection confirmation port and a connection confirmation guide circuit connected to the connection confirmation port.

[0116] In an 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 for the controller 460 to identify the connection state of the charging interface and the vehicle interface. The connection confirmation circuit in the vehicle interface can be connected to the vehicle-mounted controller 340, and the connection confirmation circuit in the vehicle interface is used for the vehicle-mounted controller to identify the connection state of the vehicle interface and the charging interface.

[0117] Hereinafter, the vehicle-mounted charging connection device, the electric vehicle and the liquid cooling equipment, and the charging pile will be described respectively. It should be noted that the vehicle socket in the following can be understood as the vehicle interface in the above, and the charging plug can be understood as the pile end interface in the above.

[0118] Firstly, the present application provides a vehicle-mounted charging connection device, which is applied to an electric vehicle, and the vehicle-mounted charging connection device includes a vehicle socket and a connection confirmation circuit, and the vehicle socket includes a direct current socket, a liquid cooling socket and a connection confirmation socket.

[0119] One end of the direct current socket is used for connecting a direct current plug of a charging gun, and the other end of the direct current socket is connected to a power battery of the electric vehicle.

[0120] One end of the liquid cooling socket is used for connecting a liquid cooling plug of the charging gun, and the other end of the liquid cooling socket is connected to a thermal management system of the power battery through a liquid cooling pipeline, and the liquid cooling socket is used for receiving cooling liquid output by the liquid cooling plug, or the liquid cooling socket is used for outputting cooling liquid to the liquid cooling plug.

[0121] One end of the connection confirmation socket is used for connecting a connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit.

[0122] The vehicle-mounted charging connection device is used for judging the connection state of the DC socket and the DC plug and judging the connection state of the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit. In the case that 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 for receiving DC power to charge the power battery.

[0123] The liquid cooling socket in the embodiment of the application includes an inlet and outlet, that is, includes an inlet and an outlet. The inlet of the liquid cooling socket is connected with the outlet of the liquid cooling plug, and the outlet of the liquid cooling socket is connected with the return port of the liquid cooling plug. Thus, the cooling medium in the liquid cooling system in the charging pile is input to the thermal management system of the power battery through the liquid cooling plug and the liquid cooling socket, so as to realize the cooling of the power battery. The charging socket and the liquid cooling socket in the embodiment of the application are two different sockets. The charging socket is connected with the charging plug of the charging pile. The charging socket can include a charging loop contactor, which can be K5 and K6, for example. The charging loop contactor can be used to disconnect or conduct the power transmission loop between the electrically connected charging socket and the power battery.

[0124] Although the liquid cooling socket and the charging socket are two different sockets, they are integrated in one interface. Correspondingly, the liquid cooling plug and the charging plug can be integrated in one charging gun.

[0125] In the prior art, the connection port of the cooling system under the vehicle is only a single inlet and outlet. In the case that the charging pile charges the power battery of the electric vehicle, the electric vehicle and the cooling system under the vehicle cannot identify whether they are connected with each other, which will affect the normal charging of the power battery by the charging pile at high power. The vehicle socket in the embodiment of the application includes a connection confirmation socket. Since the connection confirmation socket is connected with the connection confirmation circuit, the vehicle-mounted charging connection device can judge the connection state of the liquid cooling socket and the liquid cooling plug according to the voltage of the detection point in the connection confirmation circuit. In the case that the vehicle 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 can realize the cooling of the power battery by injecting the cooling medium into the power battery, so as to solve the heat dissipation problem of the power battery during charging and improve the charging power of the charging device for the power battery. In addition, the liquid cooling socket and the charging socket in the application are integrated in one interface. Correspondingly, the charging pile only needs to be configured with one charging gun, and the user only needs to plug in the gun once to realize the cooling function when the power battery is charged in the charging pile, thereby improving the user experience.

[0126] In one embodiment, when the liquid-cooled socket is connected with the liquid-cooled plug and the DC socket is connected with 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 vehicle-mounted charging connection device is configured to determine the connection state of the liquid-cooled socket and the liquid-cooled 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.

[0127] In response to the voltage of the detection point reaching a preset value, the vehicle-mounted charging connection device determines that the liquid-cooled socket is successfully connected with the liquid-cooled plug and the DC socket is successfully connected with the DC plug.

[0128] In one embodiment, when the liquid-cooled socket is connected with the liquid-cooled plug and the DC socket is connected with the DC plug, i.e., when the vehicle socket of the vehicle-mounted charging connection device is connected with the end pile plug of the charging pile, 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. The detection point can be arranged in the current loop, and when the voltage of the detection point reaches a preset value, the vehicle-mounted charging connection device determines that the vehicle socket is successfully connected with the end pile plug, i.e., the liquid-cooled socket is successfully connected with the liquid-cooled plug and the DC socket is successfully connected with the DC plug.

[0129] Through this design, the vehicle-mounted charging connection device can determine the connection state of the liquid-cooled socket and the liquid-cooled plug and the connection state of the DC socket and the DC plug according to the voltage of the detection point, and when the liquid-cooled socket is successfully connected with the liquid-cooled plug and the DC socket is successfully connected with the DC plug, the liquid-cooled system can cool the power battery by injecting cooling medium into the power battery when the charging pile charges the power battery at a high power, thereby meeting the heat dissipation requirement of the power battery when the power battery is charged at a high power, and being conducive to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0130] The preset value in the embodiment of the 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 the connection confirmation circuit in the following Figures 4-6 .

[0131] In one embodiment, in response to the liquid-cooled socket being successfully connected with the liquid-cooled plug and the DC socket being successfully connected with the DC plug, the vehicle-mounted charging connection device is configured to send a message indicating that the liquid-cooled socket is successfully connected with the liquid-cooled plug and the DC socket is successfully connected with the DC plug.

[0132] In this embodiment, when the on-board charging connection device determines that the liquid-cooled socket and liquid-cooled plug are successfully connected and the DC socket and DC plug are successfully connected, the on-board charging connection device can send a message to the charging pile. This message indicates that the liquid-cooled socket and liquid-cooled plug are successfully connected and the DC socket and DC plug are successfully connected. After receiving this message, the charging pile does not need to determine the connection status of the liquid-cooled plug and liquid-cooled socket based on the voltage of the detection point in the connection confirmation circuit, which improves the efficiency of the determination.

[0133] In one embodiment, the connection confirmation socket includes a first connection confirmation socket, a second connection confirmation socket, and a third connection confirmation socket, 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 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.

[0134] The on-board charging connection device is used to determine the connection status of the DC socket and the DC plug through a first connection confirmation circuit or a second connection confirmation circuit. The on-board charging connection device is used to determine the connection status of the liquid-cooled socket and the liquid-cooled plug through a third connection confirmation circuit.

[0135] In this embodiment of the application, the connection confirmation socket of the vehicle charging connection device may include three connection confirmation sockets, which are respectively connected to three connection confirmation circuits.

[0136] The vehicle charging connection device is used to determine the connection status of 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 of the liquid cooling socket and the liquid cooling plug through the third connection confirmation circuit (i.e., the third connection confirmation circuit).

[0137] In this embodiment, the first connection confirmation socket and the second connection confirmation socket can correspond to the sockets of the CC2 port and the CC1 port, respectively. The first connection confirmation circuit is a circuit connected to the CC2 port, and the second connection confirmation circuit is a circuit connected to the CC1 port. The vehicle charging connection device can determine the connection status of the DC socket and the DC plug based on the circuit connected to the CC1 port or the circuit connected to the CC2 port.

[0138] In this embodiment, the third connection confirmation socket can correspond to the socket of the CC3 port, and the third connection confirmation circuit is a circuit connected to the CC3 port. The vehicle charging connection device can determine the connection status of the liquid-cooled socket and the liquid-cooled plug based on the circuit connected to the CC3 port.

[0139] In the embodiments of the present application, the vehicle-mounted charging connection device judges the connection state of the DC socket and the DC plug according to the first connection confirmation circuit or the second connection confirmation circuit, judges the connection state of the liquid cooling socket and the liquid cooling plug according to the third connection confirmation circuit, can judge the connection state of the DC socket and the DC plug and the connection state of the liquid cooling socket and the liquid cooling plug based on different connection confirmation circuits, and can improve the accuracy of judging the connection state.

[0140] In the present application, the connection confirmation circuit of the vehicle-mounted charging connection device can be designed in different forms, and several possible circuit design forms will be introduced below in combination with the drawings.

[0141] 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.

[0142] 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 judge the connection state of the DC socket and the DC plug, and in response to the voltage of 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 judge that the DC socket and the DC plug are successfully connected.

[0143] As shown in Figure 4 , it is a schematic diagram of a charging system provided by an embodiment of the present application. Among them, the first resistance unit includes a resistor R5, the first connection confirmation socket is the socket corresponding to the CC2 port, and the voltage source is U2. The detection point between the first resistance unit and the first connection confirmation socket is detection point 2.

[0144] Before the DC socket is connected with the DC plug, since the detection point 2 is connected with the voltage source U2, the voltage of the detection point 2 should be the voltage output by the voltage source U2. Only in the case that the DC socket is connected with the DC plug, the voltage source U2 forms a loop through the resistance R5 in the electric vehicle, the resistance R3 in the charging pile and the grounding wire in the charging pile. Because of the voltage division function of the resistance, the voltage of the detection point 2 will reach the first vehicle-end preset value.

[0145] For example, the voltage output by the voltage source U2 is set to 12V, and the resistance values of R3 and R5 are equal, so the first vehicle-end preset value is 6V. In this design, if the voltage of the detection point 2 is 6V, the vehicle-mounted charging connection device recognizes that the DC socket and the DC plug are successfully connected.

[0146] For another example, the voltage output by the voltage source U2 is still set to 12V, but the resistance values of R3 and R5 are not equal, for example, R3 is 2Ω and R5 is 4Ω, so the first vehicle-end preset value is 4V. In this design, if the voltage of the detection point 2 is 4V, the vehicle-mounted charging connection device recognizes that the DC socket and the DC plug are successfully connected.

[0147] Therefore, based on the above analysis, in the case that the voltage at the detection point 2 is the voltage output by the voltage source U2, the on-board charging connection device can identify that the DC socket is not connected with the DC plug. In the case that the voltage at the detection point 2 reaches the first vehicle end preset value, the on-board charging connection device can identify that the DC socket is connected with the DC plug.

[0148] As shown in FIG. 6, it is a schematic diagram of another charging system provided by the embodiment of the present application. The first resistance unit includes the resistance R5 and the switch S3, and the first connection confirmation socket is the socket corresponding to the CC2 port. The detection point between the first resistance unit and the first connection confirmation socket is still the detection point 2. The specific judgment process is similar to that of the charging system shown in FIG. 5, and thus is not described herein again for simplicity. Figure 5 As shown in FIG. 7, it is a schematic diagram of still another charging system provided by the embodiment of the present application. The first resistance unit includes the resistance R5 and the switch Sv, and the first connection confirmation socket is the socket corresponding to the CC2 port. The detection point between the first resistance unit and the first connection confirmation socket is still the detection point 2. The specific judgment process is similar to that of the charging system shown in FIG. 6, and thus is not described herein again for simplicity. Figure 4 As shown in FIG. 7, it is a schematic diagram of still another charging system provided by the embodiment of the present application. The first resistance unit includes the resistance R5 and the switch Sv, and the first connection confirmation socket is the socket corresponding to the CC2 port. The detection point between the first resistance unit and the first connection confirmation socket is still the detection point 2. The specific judgment process is similar to that of the charging system shown in FIG. 6, and thus is not described herein again for simplicity.

[0149] As shown in FIG. 7, it is a schematic diagram of still another charging system provided by the embodiment of the present application. The first resistance unit includes the resistance R5 and the switch Sv, and the first connection confirmation socket is the socket corresponding to the CC2 port. The detection point between the first resistance unit and the first connection confirmation socket is still the detection point 2. The specific judgment process is similar to that of the charging system shown in FIG. 6, and thus is not described herein again for simplicity. Figure 6 As shown in FIG. 7, it is a schematic diagram of still another charging system provided by the embodiment of the present application. The first resistance unit includes the resistance R5 and the switch Sv, and the first connection confirmation socket is the socket corresponding to the CC2 port. The detection point between the first resistance unit and the first connection confirmation socket is still the detection point 2. The specific judgment process is similar to that of the charging system shown in FIG. 6, and thus is not described herein again for simplicity. Figure 4 As shown in FIG. 7, it is a schematic diagram of still another charging system provided by the embodiment of the present application. The first resistance unit includes the resistance R5 and the switch Sv, and the first connection confirmation socket is the socket corresponding to the CC2 port. The detection point between the first resistance unit and the first connection confirmation socket is still the detection point 2. The specific judgment process is similar to that of the charging system shown in FIG. 6, and thus is not described herein again for simplicity.

[0150] In the embodiment of the present application, since the detection point provided by the present application is connected with the voltage source U2 in the electric vehicle, in the case that the voltage at the detection point is the voltage output by the voltage source U2, the on-board charging connection device identifies that the DC socket is not connected with the DC plug. In the case that the voltage at the detection point reaches the first vehicle end preset value, the on-board charging connection device identifies that the DC socket is connected with the DC plug. By identifying the connection state of the DC socket and the DC plug according to the voltage at the detection point, the accuracy of the on-board charging connection device in identifying the connection state of the DC socket and the DC plug can be improved, thereby being beneficial to the normal charging of the power battery.

[0151] The above embodiment illustrates that in the case that the voltage at the detection point 2 reaches the first vehicle end preset value, the on-board charging connection device judges that the DC socket and the DC plug are in the connection state. In addition, the on-board charging connection device can also determine the connection state of the first resistance unit and the voltage source according to the specific voltage value at the detection point 2.

[0152] For example, if the internal contact of the electric vehicle is good, since the detection point 2 is located between the resistance R5 and the resistance R3, and due to the voltage division function of the resistance, the voltage at the detection point 2 should be greater than 0 and less than the output voltage of the voltage source (i.e. the first vehicle end preset value). For example, if the voltage output by the voltage source is 12V, and the resistance values of R5 and R3 are equal, the voltage at the detection point 2 is 6V.

[0153] If the internal connection of the electric vehicle is poor, for example, R5 is not connected with the voltage source U2, and is in a suspended state, which is equivalent to that R5 and R3 are directly connected with the ground wire in the liquid cooling device. For any detection point on the branch of R5, R3 and the ground wire, the voltage is 0V. Because the detection point 2 is located on the branch formed by the resistance R5, the resistance R3 and the ground wire, the voltage of the detection point 2 is 0V.

[0154] Therefore, the on-board charging connection device can further determine the connection state inside the electric vehicle according to the voltage of the detection point 2, which is beneficial to improve the safety of the electric vehicle.

[0155] In an embodiment, the vehicle socket further comprises a ground socket, one end of the ground socket is used for connecting the ground plug of the charging gun, and the other end of the ground socket is connected with the vehicle body ground platform. The second connection confirmation circuit comprises a second resistance unit, and the second connection confirmation socket is connected with the vehicle body ground platform through the second resistance unit.

[0156] The on-board charging connection device is further used for detecting the voltage of the detection point between the second resistance unit and the second connection confirmation socket to determine the connection state of the DC socket and the DC plug.

[0157] In response to that the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaches the first vehicle end preset value, and the voltage of the detection point between the second resistance unit and the second connection confirmation socket reaches the second vehicle end preset value, the on-board charging connection device is used for determining that the DC socket and the DC plug are successfully connected.

[0158] Continuing to refer to the above Figure 5 , the second resistance unit can comprise R4, R6 and a switch S2. The second connection confirmation socket is the socket corresponding to the CC1 port. The detection point between the second resistance unit and the second connection confirmation socket is the detection point 3.

[0159] Before the DC socket is connected with the DC plug, because the detection point 3 is connected with the vehicle electrical platform, the voltage of the detection point 3 should be 0V. Only in the case that the DC socket is connected with the DC plug, and assuming that the switch S1 and the switch S2 are closed, the voltage source U1 in the charging pile passes through the resistance R1, the resistance R4 in the electric vehicle and forms a loop, because of the voltage division function of the resistance, the voltage of the detection point 3 reaches the second vehicle end preset value.

[0160] For example, the voltage output by the voltage source U1 is set to 12V, and the resistance values of R1 and R4 are equal, so the second vehicle end preset value is 6V. Under this design, if the voltage of the detection point 3 is 6V, the on-board charging connection device identifies that the DC socket and the DC plug are successfully connected.

[0161] For another example, the voltage output by the voltage source U1 is still set to 12V, but the resistance values of R1 and R4 are not equal, for example, R1 is 2Ω and R4 is 4Ω, then the second vehicle end preset value is 8V. In this design, if the voltage at the detection point 3 is 8V, the vehicle-mounted charging connection device recognizes that the DC socket and the DC plug are successfully connected.

[0162] In the case of connection between the DC socket and the DC plug, the voltage at the detection point 2 and the voltage at the detection point 3 should both be the vehicle end preset value. Therefore, in combination with the analysis of the detection point 2 and the detection point 3, in the case that the voltage at the detection point 3 is 0V and the voltage at the detection point 2 is the voltage output by the voltage source U2, the vehicle-mounted charging connection device can recognize that the DC socket is not connected with the DC plug. When the voltage at the detection point 2 reaches the first vehicle end preset value and the voltage at the detection point 3 reaches the second vehicle end preset value, the vehicle-mounted charging connection device can recognize that the DC socket is connected with the DC plug.

[0163] Referring to the above Figure 6 , the second resistance unit can include R3', R4, R4' and switches S2 and S2'. The second connection confirmation socket is a socket corresponding to the CC1 port. The detection point between the second resistance unit and the second connection confirmation socket is still the detection point 3. The specific judgment process is similar to the above Figure 5 , and will not be described again.

[0164] In the embodiments of the present application, by recognizing the connection state of the DC socket and the DC plug according to the voltages at two detection points, the accuracy of the vehicle-mounted charging connection device in recognizing the connection state of the DC socket and the DC plug can be further improved, thereby being beneficial to the normal charging of the power battery.

[0165] In one embodiment, the third connection confirmation circuit includes a third resistance unit, and the third connection confirmation socket is connected with the voltage source through the third resistance unit.

[0166] The vehicle-mounted charging connection device is used to detect the voltage at the detection point between the third resistance unit and the third connection confirmation socket to judge the connection state between the liquid-cooled socket and the liquid-cooled plug, and 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 vehicle-mounted charging connection device is used to judge that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0167] Continuing to refer to Figure 4 , Figure 4The diagram shows a third connection confirmation socket and a third connection confirmation plug. The third connection confirmation socket corresponds to the CC3 port. In this embodiment, the third resistor unit 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 connected to the liquid-cooled plug, since detection point 4 is connected to the voltage source U2, the voltage at 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 does the current of the voltage source U2 form a loop through the resistor R7 in the electric vehicle, the resistor R6 in the charging pile, and the grounding wire in the charging pile. Since detection point 4 is located between resistors R7 and R6, the voltage at detection point 4 will reach the third vehicle-side preset value due to the voltage division function of the resistors.

[0168] For example, if the voltage output of voltage source U2 is set to 12V, and the resistance values ​​of R7 and R6 are equal, then the preset value at the third vehicle terminal is 6V. Under this design, if the voltage at detection point 4 is 6V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0169] For example, the voltage output of voltage source U2 is still set to 12V, but the resistance values ​​of R7 and R6 are different, such as R7 being 2Ω and R6 being 4Ω, then the preset value at the third vehicle end is 8V. Under this design, if the voltage at detection point 4 is 8V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0170] Based on the above analysis, when the voltage at detection point 4 is the output voltage of 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 preset value of the third vehicle end, the on-board charging connection device can identify that the liquid-cooled socket is connected to the liquid-cooled plug.

[0171] Continue to refer to Figure 5 , Figure 5 The diagram shown includes a third connection confirmation socket. In this embodiment, the third resistor unit is R7, the voltage source is still U2, and the detection between the third resistor unit and the third connection confirmation socket is still detection point 4. The specific identification process is the same as... Figure 4 Similarly, for the sake of brevity, I will not go into details.

[0172] Continue to refer to Figure 6 , Figure 6 The diagram shown includes a third connection confirmation socket. In this embodiment, the third resistor unit is R7, the voltage source is still U2, and the detection between the third resistor unit and the third connection confirmation socket is still detection point 4. The specific identification process is the same as... Figure 4 Similarly, for the sake of brevity, I will not go into details.

[0173] In this embodiment, since the detection point is connected to the voltage source in the electric vehicle, when the voltage at the detection point is the voltage output by the voltage source, the on-board charging connection device identifies that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at the detection point reaches a preset value at the third vehicle end, the on-board charging connection device identifies that the liquid cooling socket is connected to the liquid cooling plug. By identifying the connection status of the liquid cooling socket and the liquid cooling plug based on the voltage at the detection point, the accuracy of the on-board charging connection device in identifying the connection status of the liquid cooling socket and the liquid cooling plug can be improved. This facilitates the liquid cooling equipment in delivering the cooling medium in the liquid cooling system to the power battery, thereby cooling the power battery.

[0174] The above embodiment illustrates that when the voltage at detection point 4 reaches the preset value at the third vehicle end, the on-board charging connection device determines that the liquid-cooled socket and the liquid-cooled plug are in a connected state. Furthermore, the on-board charging connection device can also determine the connection state between the third resistor unit and the voltage source based on the specific voltage value at detection point 4.

[0175] For example, if the internal contact of the electric vehicle is good, because detection point 4 is located between resistors R6 and R7, and due to the voltage division function of the resistors, the voltage at detection point 4 should be greater than 0 and less than the output voltage of the voltage source (i.e., the preset value at the third vehicle end). For example, if the voltage output of the voltage source is 12V, and the resistance values ​​of R7 and R6 are equal, then the voltage at detection point 4 will be 6V.

[0176] If there is poor contact inside the electric vehicle, for example, if R7 is not connected to the voltage source U2 and is in a floating state, it is equivalent to R7 and R6 being directly connected to the grounding wire in the liquid cooling equipment. The voltage at any test point on this branch of R7, R6, and the grounding wire will be 0V. Because test point 4 is located on the branch formed by resistors R7 and R6 and the grounding wire, the voltage at test point 4 will be 0V.

[0177] Therefore, the on-board charging connection device can further determine the internal connection status of the electric vehicle based on the voltage at detection point 4, which helps to improve the safety of the electric vehicle.

[0178] Based on this, the above text introduced different embodiments of the vehicle charging connection device for determining the connection status of DC sockets and DC plugs, as well as liquid-cooled sockets and liquid-cooled plugs, from the perspective of vehicle charging connection devices. The following text will explain from the perspective of charging guns and charging piles.

[0179] The application provides a charging gun applied to a charging pile. The charging gun comprises a charging plug and a connection confirmation circuit. The charging plug comprises a direct current plug, a liquid cooling plug and a connection confirmation plug. One end of the direct current plug is used for connecting a direct current socket of an electric vehicle, and the other end of the direct current plug is used for connecting a power conversion device of the charging pile. One end of the liquid cooling plug is used for connecting a liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is used for connecting a liquid cooling device of the charging pile. The liquid cooling plug is used for receiving cooling liquid output by the liquid cooling device. One end of the connection confirmation plug is used for connecting a connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used for connecting the connection confirmation circuit.

[0180] The application also provides a charging pile. The charging pile comprises a charging gun, a liquid cooling device and a charging device. The charging gun comprises a charging plug and a connection confirmation circuit. The charging plug comprises a direct current plug, a liquid cooling plug and a connection confirmation plug. One end of the direct current plug is used for connecting a direct current socket of an electric vehicle, and the other end of the direct current plug is used for connecting a power conversion device of the charging pile. One end of the liquid cooling plug is used for connecting a liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is used for connecting a liquid cooling device of the charging pile. The liquid cooling plug is used for receiving cooling liquid output by the liquid cooling device. One end of the connection confirmation plug is used for connecting a connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used for connecting the connection confirmation circuit.

[0181] In the case that the liquid cooling plug is successfully connected with the liquid cooling socket and the direct current plug is successfully connected with the direct current socket, the direct current plug sends direct current to charge the power battery.

[0182] The charging gun in the application embodiment can also be called a liquid cooling and charging composite gun. The charging plug of the charging gun in the application embodiment comprises a liquid cooling plug in addition to the direct current plug, so that the cooling medium in the charging pile can enter the electric vehicle through the liquid cooling plug to cool the power battery.

[0183] In the prior art, the connection port of the cooling system under the vehicle is only a single liquid inlet and outlet. In the case that the charging pile charges the power battery of the electric vehicle, the electric vehicle and the cooling system under the vehicle cannot identify whether they are connected, which affects the normal charging of the power battery by the charging pile. In the application embodiment, the charging gun can send direct current to charge the power battery in the case that the liquid cooling plug is successfully connected with the liquid cooling socket and the direct current plug is successfully connected with the direct current socket. When the charging pile charges the power battery at a high power, the liquid cooling system cools the power battery by injecting cooling medium into the power battery. In addition, the liquid cooling socket and the charging socket in the application are integrated in one interface. Correspondingly, the charging pile only needs to be configured with one charging gun, and the user only needs to plug in the gun once to realize the cooling function when the power battery is charged by the charging pile, thereby improving the user experience.

[0184] In one embodiment, for the charging gun, when the liquid cooling plug is connected with the liquid cooling socket and the DC plug is connected with 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 with the charging gun 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.

[0185] For the charging pile, when the voltage of the detection point reaches the preset value, the charging pile determines that the DC plug is successfully connected with the DC socket.

[0186] In the embodiment of the present application, when the liquid cooling socket is connected with the liquid cooling plug and the DC socket is connected with the DC plug, that is, when the vehicle socket of the vehicle-mounted charging connection device is connected with the charging plug of the charging device, 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. A detection point can be arranged in the current loop, and when the voltage of the detection point reaches a preset value, the charging pile determines that the vehicle socket is successfully connected with the pile-end plug, that is, the liquid cooling socket is successfully connected with the liquid cooling plug, and the DC socket is successfully connected with the DC plug.

[0187] Through this design, the charging pile can determine the connection state of the DC socket and the DC plug according to the voltage of the detection point, and when the liquid cooling socket is successfully connected with the liquid cooling plug and the DC socket is successfully connected with the DC plug, the liquid cooling system can cool the power battery by injecting cooling medium into the power battery when the charging pile charges the power battery at a high power, thereby meeting the heat dissipation demand of the power battery during high-power charging, which is conducive to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0188] 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 the connection confirmation circuit in the following Figures 4-6 .

[0189] In one embodiment, the charging pile is used to receive a message indicating that the liquid cooling socket is successfully connected with the liquid cooling plug.

[0190] In the embodiment of the present application, for the judgment of the connection state of the liquid cooling socket and the liquid cooling socket, the charging pile can receive a message from the vehicle-mounted charging connection device indicating that the liquid cooling socket is successfully connected with the liquid cooling plug. Therefore, when the liquid cooling socket is successfully connected with the liquid cooling plug and the DC socket is successfully connected with the DC plug, the liquid cooling system can cool the power battery by injecting cooling medium into the power battery when the charging pile charges the power battery at a high power, thereby meeting the heat dissipation demand of the power battery during high-power charging, which is conducive to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0191] The specific circuit form of the connection confirmation circuit and the strategy of the charging pile for judging the connection state of the DC socket and the DC plug will be described below with reference to the drawings.

[0192] In one embodiment, 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 connected to the first connection confirmation circuit, the second connection confirmation circuit, and the third connection confirmation circuit respectively.

[0193] 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.

[0194] The second connection confirmation circuit includes a fifth resistance unit, and 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.

[0195] 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.

[0196] The charging pile is used to judge 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.

[0197] In response to the voltage of the detection point between the fifth resistance unit and the second connection confirmation plug reaching the preset value at the pile end, the charging pile judges that the DC plug and the DC socket are successfully connected.

[0198] In the embodiments of the present application, for the judgment of the connection state of the DC plug and the DC socket, the charging pile can use the method in the charging standard for judgment.

[0199] Referring to the above Figure 4 , the fifth resistance unit in the embodiments of the present application is R1, the voltage source is still U1, and the detection between the fifth resistance unit and the second connection confirmation plug is detection point 1. Before the DC socket is connected to the DC plug, since the detection point 1 is connected to the voltage source U1, the voltage of the detection point 1 should be the voltage output by the voltage source U1. Only when the DC socket is connected to the DC plug, the current of the voltage source U1 forms a loop through the resistance R1 in the DC device, the resistance R4 in the electric vehicle, and the grounding wire in the electric vehicle. Since the detection point 1 is located between the resistance R1 and the resistance R4, because of the voltage division function of the resistance, the voltage of the detection point 1 will reach the preset value at the pile end.

[0200] For example, the voltage output by the voltage source U1 is set to 12V, and the resistance values of R1 and R4 are equal, so that the preset value at the end of the charging pile is 6V. In this design, if the voltage at the detection point 1 is 6V, the charging pile identifies that the DC socket and the DC plug are in a connected state.

[0201] For another example, the voltage output by the voltage source U1 is still set to 12V, but the resistance values of R1 and R4 are not equal, for example, R1 is 2Ω and R4 is 4Ω, so that the preset value at the end of the charging pile is 8V. In this design, if the voltage at the detection point 1 is 8V, the charging pile identifies that the DC socket and the DC plug are in a connected state.

[0202] Based on the above analysis, when the voltage at the detection point 1 is the voltage output by the voltage source U1, the charging pile can identify that the DC socket is not connected with the DC plug. When the voltage at the detection point 1 is the preset value at the end of the charging pile, the charging pile can identify that the DC socket is successfully connected with the DC plug.

[0203] With reference to Figure 5 , the fifth resistance unit of the embodiment of the present application includes R1, R2 and switch S1, the voltage source is still U1, and the detection point between the fifth resistance unit and the second connection confirmation plug is still detection point 1. The specific identification process is similar to Figure 4 , and will not be described again for brevity.

[0204] With reference to Figure 6 , the fifth resistance unit of the embodiment of the present application includes R1, R1', switch S1 and switch S0, the voltage source is still U1, and the detection point between the fifth resistance unit and the second connection confirmation plug is still detection point 1. The specific identification process is similar to Figure 4 , and will not be described again for brevity.

[0205] In the embodiment of the present application, since the detection point is connected with 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 identifies that the DC socket is not connected with the DC plug. When the voltage at the detection point reaches the preset value at the end of the charging pile, the charging pile identifies that the DC socket is connected with the DC plug. By identifying the connection state of the DC socket and the DC plug according to the voltage at the detection point, the accuracy of the charging pile in identifying the connection state of the DC socket and the DC plug can be improved, thereby being beneficial to the normal charging of the power battery.

[0206] In one embodiment, the second connection confirmation circuit further includes a normally closed switch, the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug, and the detection point includes 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.

[0207] The charging pile is used to judge 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 of the detection point between the normally closed switch and the second connection confirmation plug.

[0208] In response to the voltage of the detection point between the fifth resistance unit and the normally closed switch, and the voltage of the detection point between the normally closed switch and the second connection confirmation plug reaching the preset value at the pile end, the charging pile judges that the DC plug and the DC socket are connected successfully.

[0209] Referring to the above Figure 5 , the fifth resistance unit in the embodiment of the 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.

[0210] Before the DC socket is connected with the DC plug, since the detection point 1 is connected with the voltage source U1 and the switch S is a normally closed switch, the voltages of the detection point 1 and the detection point 5 should be the voltage output by the voltage source U1. Only when the DC socket is connected with the DC plug, the current of the voltage source U1 forms a loop through the resistance R1 in the DC device, the resistance R4 in the electric vehicle and the grounding wire in the electric vehicle. Since the detection point 1 and the detection point 5 are both located between the resistance R1 and the resistance R4, because of the voltage division function of the resistance, the voltages of the detection point 1 and the detection point 5 will reach the preset value at the pile end. There is another possible situation that the DC socket is connected with the DC plug, but the switch S is in the off state. At this time, the detection point 1 is connected with the voltage source U1, and the detection point 5 is connected with the grounding wire in the electric vehicle, resulting in that the voltage of the detection point 1 is the voltage output by the voltage source U1, and the voltage of the detection point 5 is 0V.

[0211] For example, the voltage output by the voltage source U1 is set to be 12V, and the resistance values of R1 and R4 are equal, so that the preset value at the pile end is 6V. Under this design, if the voltages of the detection point 1 and the detection point 5 are both 6V, it indicates that the DC socket is successfully connected with the DC plug. If the voltage of the detection point 1 is 12V and the voltage of the detection point 5 is 0V, it indicates that the DC socket is in the connection state with the DC plug but the switch S is off.

[0212] For another example, the voltage output by the voltage source U1 is still set to be 12V, but the resistance values of R1 and R4 are not equal, for example, R1 is 2Ω and R4 is 4Ω, so that the preset value at the pile end is 8V. Under this design, if the voltages of the detection point 1 and the detection point 5 are both 8V, it indicates that the DC socket is in the connection state with the DC plug. If the voltage of the detection point 1 is 12V and the voltage of the detection point 5 is 0V, it indicates that the DC socket is in the connection state with the DC plug but the switch S is off.

[0213] Based on the above analysis, when the voltages at the detection points 1 and 5 are the voltage output by the voltage source U1, it is indicated that the DC socket is not connected with the DC plug. When the voltages at the detection points 1 and 5 are the preset value of the pile end, it is indicated that the DC socket is successfully connected with the DC plug. When the voltage at the detection point 1 is the voltage output by the voltage source U1 and the voltage at the detection point 5 is 0V, it is indicated that the DC socket is connected with the DC plug but the switch S is in the off state.

[0214] In the embodiments of the present application, the voltages of the two detection points indicate the connection state of the DC socket and the DC plug, and the charging pile can judge the connection state of the DC socket and the DC plug according to the voltages of the two detection points, which can further improve the correctness of the charging pile in judging the connection state of the DC socket and the DC plug.

[0215] Based on this, the connection confirmation circuit and the connection state of the DC socket and the DC plug and the connection state of the liquid-cooled socket and the liquid-cooled plug are introduced above. The sequence of the contact coupling of the plug and the socket in the connection process will be described below.

[0216] In one embodiment, the vehicle socket includes a plug-in end for plugging 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-cooled socket to the plug-in end. The charging plug includes a plug-in end for plugging 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-cooled plug to the plug-in end.

[0217] In the embodiments 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-cooled socket to the plug-in end, which means that the contacts of the liquid inlet and outlet of the liquid-cooled socket are coupled first, and the contacts of the third connection confirmation socket and the third connection confirmation plug are coupled later. In other words, the coupling of the contacts of the third connection confirmation socket and the third connection confirmation plug is later than the coupling of the contacts of the liquid inlet and outlet of the liquid-cooled socket and the liquid inlet and outlet of the liquid-cooled plug.

[0218] As shown in Figure 7 and Figure 8 , it is a charging interface schematic diagram provided by the embodiments of the present application. Among them, the plug-in end is the dashed line between the plug and the socket shown in the figure. DC+ and DC- are positive and negative DC power ports, PE is a grounding port, CC3 is a port indicating liquid inlet and outlet connection confirmation, CC1 and CC2 are ports indicating charging connection confirmation, S+ and S- are charging communication ports, A+ and A- are positive and negative ports indicating low-voltage auxiliary power supply, I and O are liquid inlet and outlet respectively.

[0219] In the embodiments of the present application, the distance from the third connection confirmation plug to the plug end is d3, the distance from the liquid inlet and outlet of the liquid cooling plug to the plug end is d0, and d3>d0. The distance from the third connection confirmation socket to the plug end is d3', the distance from the liquid inlet and outlet of the liquid cooling socket to the plug end is d0', and d3'>d0'. Based on this design, in the process of connecting the vehicle socket with the vehicle plug, the liquid inlet and outlet of the liquid cooling socket is connected first, and then the third connection confirmation socket and the third connection confirmation plug (i.e. CC3) are connected, thereby facilitating the cooling of the power battery by the liquid cooling system under the vehicle when the charging pile charges the electric vehicle at a high power. This is because, if the third connection confirmation socket and the third connection confirmation plug are connected first, and the liquid inlet and outlet of the liquid cooling socket is connected later, the CC3 port may be turned on, but the liquid inlet and outlet of the liquid cooling socket may not be connected with the liquid inlet and outlet of the liquid cooling plug, thereby causing the liquid inlet and outlet connection confirmation to be incorrect, and a water leakage may occur.

[0220] In an embodiment, the distance from the third connection confirmation socket to the plug end is less than or equal to the distance from the second connection confirmation socket to the plug end, and the distance from the third connection confirmation plug to the plug end is less than or equal to the distance from the second connection confirmation plug to the plug end.

[0221] In the embodiments of the present application, with reference to Figure 7 , the distance from the second connection confirmation plug to the plug end is d1, the distance from the second connection confirmation socket to the plug end is d1', and d3≤d1 and d3'≤d1'. Based on this design, in the process of connecting the vehicle socket with the vehicle plug, the contact of the third connection confirmation socket is connected with the contact of the third connection confirmation plug (i.e. CC3) first, and the contact of the second connection confirmation socket is connected with the contact of the second connection confirmation plug (i.e. CC1) later, which is equivalent to the final complete connection confirmation by the charging pile. This design can follow the existing coupling sequence of the contacts in the process of connecting the vehicle socket with the vehicle plug, and only needs to add a coupling of the liquid inlet and outlet and a coupling of the third connection confirmation socket and the third connection confirmation plug, which is relatively simple.

[0222] It should be noted that if d3=d1 and d3'=d1' are designed, 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 in the process of connecting the vehicle socket with the vehicle plug, which is equivalent to the final complete connection confirmation by the charging pile and the electric vehicle together.

[0223] Full connection.

[0224] 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.

[0225] 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.

[0226] In the embodiments of the present application, the traction device in the electric vehicle is used to move the charging gun to make the vehicle socket and the charging gun fully connected. In this case, when the user inserts the charging gun into the vehicle socket, the charging gun and the vehicle socket are first in a semi-connected state, and then the traction device moves the charging gun to make the charging gun and the vehicle socket fully connected. Since the charging gun and the vehicle socket are fully connected by the traction device moving the charging gun in this process, the user does not need to manually push the charging gun, which can improve the user experience.

[0227] Reference Figure 8In the embodiment of the present application, the connection of 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, so 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 plug end is d2, the distance from the first connection confirmation socket to the plug end is d2', the distance from the second connection confirmation plug to the plug end is d1, the distance from the second connection confirmation socket to the plug end is d1', the distance from the third connection confirmation plug to the plug end is d3, and the distance from the third connection confirmation socket to the plug end is d3', and d2≤d0<d1=d3, d2'≤d0'<d1'=d3'. Based on this design, during the connection of the liquid cooling socket and the liquid cooling plug, the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug (i.e., CC2) are connected first, the liquid inlet and outlet of the liquid cooling socket and the liquid inlet and outlet of the liquid cooling plug are connected, then the contacts of the second connection confirmation socket and the contacts of the second connection confirmation plug (i.e., CC1), and the contacts of the third connection confirmation socket and the contacts of the third connection confirmation plug (i.e., CC3) are connected last. Among them, the connection of 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, the connection of the second connection confirmation socket and the second connection confirmation plug, and the connection of 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', the last full connection confirmation is performed by the electric vehicle and the charging pile together, that is, the timing of the electric vehicle and the charging pile to judge the connection state of the liquid cooling socket and the liquid cooling plug is consistent, which can ensure that the liquid cooling medium is transmitted to the thermal management system of the power battery in time, and can also avoid misjudgment of the charging pile.

[0228] In the embodiment of the present application, when the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug are connected, it indicates that the liquid cooling socket and the liquid cooling plug are in a semi-connected state. The traction device can pull the charging gun to move so that the charging gun is close to the vehicle socket, and finally the charging gun and the vehicle socket are in a fully connected state, without the need for the user to manually push the charging gun, which can improve the user experience. If d0>d2 is designed, that is, the contacts of the liquid inlet and outlet of the liquid cooling socket and the contacts of the liquid inlet and outlet of the liquid cooling plug are connected first, and the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug are connected later, the disadvantage of this design is that the user needs to connect the contacts of the liquid inlet and outlet of the liquid cooling socket and the contacts of the liquid inlet and outlet of the liquid cooling plug first. However, it is difficult for the user to successfully connect the contacts of the liquid inlet and outlet of the liquid cooling socket and the contacts of the liquid inlet and outlet of the liquid cooling plug, which reduces the user experience.

[0229] In addition, in the embodiments of the present application, the distance from the second connection confirmation socket to the plug end is designed to be equal to the distance from the third connection confirmation socket to the plug end, and the distance from the second connection confirmation plug to the plug end is designed to be equal to the distance from the third connection confirmation plug to the plug end, i.e. d1=d3, d1'=d3'. This is because, if d1

[0230] In an embodiment, the vehicle socket further comprises a communication socket, one end of the communication socket being used for connecting the charging gun, and the other end of the communication socket being connected to the vehicle controller of the electric vehicle.

[0231] The charging plug further comprises a communication plug, one end of the communication plug being used for connecting the vehicle socket of the electric vehicle, and the other end of the communication plug being connected to the non-vehicle-mounted charger controller of the charging pile.

[0232] The communication socket and the communication plug in the embodiments of the present application are S+ and S-. Referring to the above Figures 4-6 , the communication socket is connected to the vehicle controller, and the communication plug is connected to the non-vehicle-mounted charger controller. The content of the communication socket and the communication plug can refer to the content related to the standard, and will not be described here.

[0233] In an embodiment, the vehicle socket further comprises an auxiliary power socket, one end of the auxiliary power socket being used for connecting the auxiliary power plug of the charging gun, and the other end of the auxiliary power socket being used for receiving direct current.

[0234] The charging plug further comprises an auxiliary power plug, one end of the auxiliary power plug being used for connecting the auxiliary power socket of the electric vehicle, and the other end of the auxiliary power plug being used for sending direct current.

[0235] 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 the above Figure 7 . The specific description can refer to the related content about A+ and A- in the charging standard, and will not be described here.

[0236] In an embodiment, the direct current socket is connected to the power battery through two charging circuit contactors. The direct current plug is connected to the power conversion device through two direct current power supply circuit contactors.

[0237] Referring to the above Figures 4-6In the embodiments of the present application, the two charging circuit contactors are K5 and K6, and the two direct current power supply circuit contactors are K1 and K2. The two charging circuit contactors and the two direct current power supply circuit contactors are used to turn on or turn off the circuit for charging the power battery of the charging pile.

[0238] In an embodiment, the vehicle-mounted charging connection device is configured to: send a message for requesting the charging pile to output a first charging power to the charging pile when the liquid cooling socket is successfully connected with the liquid cooling plug and the direct current socket is successfully connected with the direct current plug; or send a message for requesting the charging pile to output a second charging power to the charging pile when the direct current socket is successfully connected with the direct current plug, the second charging power being less than the first charging power.

[0239] In the embodiments of the present application, when the liquid cooling socket is successfully connected with the liquid cooling plug and the direct current socket is successfully connected with the direct current plug, it indicates that the electric vehicle has the condition for supercharging, that is, when the power battery is charged at a large power, the liquid cooling device under the vehicle can transmit the cooling medium to the thermal management system of the power battery through the liquid cooling plug and the liquid cooling socket. Therefore, the vehicle-mounted charging connection device can send a message for requesting the charging pile to output a first charging power to the charging pile, and the first charging power can be a power greater than a certain threshold. When the charging pile charges the power battery at the first charging power, the liquid cooling device cools the power battery by injecting the cooling medium into the power battery, so as to meet the heat dissipation requirement of the power battery when it is charged at a large power, and is beneficial to improve the charging power of the power battery and reduce the charging time of the electric vehicle.

[0240] When the direct current socket is successfully connected with the direct current plug, it indicates that the electric vehicle does not have the condition for supercharging, that is, if the power battery is charged at a large power, the liquid cooling device under the vehicle cannot transmit the cooling medium to the power battery. Therefore, the vehicle-mounted charging connection device can send a message for requesting the charging pile to output a second charging power to the charging pile, and the second charging power can be a power less than a certain threshold. When the charging pile charges the power battery at the second charging power, since the second charging power is less than a certain threshold, the thermal management system on the vehicle can cool the power battery, without the need to use the liquid cooling device under the vehicle to cool the power battery.

[0241] In addition, the present application also provides an electric vehicle, which comprises a vehicle-mounted 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.

[0242] The vehicle-mounted charging connection device 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.

[0243] One end of the direct current socket is used to connect the direct current plug of the charging gun, and the other end of the direct current socket is connected with the power battery of the electric vehicle.

[0244] One end of the liquid cooling socket is used for connecting 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 for receiving the cooling liquid output by the liquid cooling plug, or the liquid cooling socket is used for outputting the cooling liquid to the liquid cooling plug.

[0245] One end of the connection confirmation socket is used for connecting the connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the connection confirmation circuit.

[0246] The vehicle-mounted charging connection device is used for judging the connection state of the DC socket and the DC plug and judging the connection state of the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit. In the case that 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 for receiving DC power to charge the power battery.

[0247] Among them, the design of the connection confirmation circuit in the vehicle-mounted charging connection device and the specific identification process and the like can refer to the related content of the above-mentioned Figures 4-6 .

[0248] In addition, the application also provides a control guide circuit applied to an electric vehicle and a charging pile. The control guide circuit comprises a connection confirmation circuit. The electric vehicle comprises a liquid cooling socket, a DC socket and a connection confirmation socket. The charging pile comprises a liquid cooling plug, a DC plug and a connection confirmation plug.

[0249] One end of the liquid cooling socket is used for connecting one end of the liquid cooling plug, and the other end of the liquid cooling socket is used for connecting the thermal management system of the power battery of the electric vehicle. The other end of the liquid cooling plug is used for receiving or outputting the cooling liquid.

[0250] One end of the DC socket is used for connecting one end of the DC plug, and the other end of the DC socket is used for connecting the power battery. The other end of the DC plug is used for connecting the power conversion device of the charging pile.

[0251] The connection confirmation circuit comprises 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 connects the liquid cooling socket and the DC socket. The pile-end connection confirmation circuit connects the liquid cooling plug and the DC plug.

[0252] In the case that the liquid cooling plug connects the liquid cooling socket and the DC plug connects the DC socket, the vehicle-end connection confirmation circuit and the pile-end connection confirmation circuit form a loop. The voltage of the detection point in the loop is used for indicating the connection state of the liquid cooling plug and the liquid cooling socket and the connection state of the DC plug and the DC socket.

[0253] The liquid cooling socket in the embodiment of the present application includes an inlet and outlet, that is, an inlet and an outlet, the outlet of the liquid cooling plug of the inlet of the liquid cooling socket is connected, and the outlet of the liquid cooling socket is connected with the return outlet of the liquid cooling plug. Thus, the cooling medium in the liquid cooling system in the charging pile is input to the thermal management system of the power battery through the liquid cooling plug and the liquid cooling socket, realizing the cooling of 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 with the charging plug of the charging pile, and the charging socket can include a charging loop contactor, which can be K5 and K6, for example. The charging loop contactor can be used to disconnect or conduct the power transmission loop between the electrically connected charging socket and the power battery.

[0254] Although the liquid cooling socket and the charging socket are two different sockets, they are integrated in one interface. Accordingly, the liquid cooling plug and the charging plug are integrated in one charging gun.

[0255] The control guide circuit in the embodiment of the present application can be applied to electric vehicles and charging piles. In other words, part of the connection confirmation circuit in the control guide 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. In the case where the liquid cooling plug is not connected with the liquid cooling socket, and the DC plug is not connected with 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 in the case where the liquid cooling plug is connected with the liquid cooling socket and the DC plug is connected with 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.

[0256] In the prior art, the connection port of the cooling system under the vehicle is only a single inlet and outlet. In the case where the charging pile charges the power battery of the electric vehicle, the electric vehicle and the external cooling system cannot recognize whether they are connected with each other, which will affect the normal 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 guide circuit can indicate the connection state of the DC plug and the DC socket, and the connection state of the liquid cooling plug and the liquid cooling socket. Therefore, in the case where the vehicle socket is successfully connected with the charging plug, when the charging pile charges the power battery at a high power, the liquid cooling system can cool the power battery by injecting cooling medium into the power battery, thereby solving the heat dissipation problem of the power battery during charging and improving the charging power of the charging device for the power battery.

[0257] The specific circuit form of the control guide circuit will be introduced below.

[0258] In an embodiment, the charging pile further comprises a grounding plug, the electric vehicle further comprises a grounding socket, one end of the grounding plug is used to connect one end of the grounding socket, the other end of the grounding plug is used to connect the equipment ground platform, the other end of the grounding socket is used to connect the vehicle body ground platform, the connection confirmation socket comprises a liquid cooling connection confirmation socket and a direct current connection confirmation socket, the direct current connection confirmation socket comprises a first direct current connection confirmation socket and a second direct current connection confirmation socket, and the direct current connection confirmation plug comprises a first direct current connection confirmation plug and a second direct current connection confirmation plug.

[0259] The vehicle end connection confirmation circuit comprises a first vehicle end connection confirmation circuit, the first vehicle end connection confirmation circuit comprises a first resistance and a first voltage source, and the first direct current connection confirmation socket is connected to the first voltage source through the first resistance.

[0260] The pile end connection confirmation circuit comprises a first pile end connection confirmation circuit, the first pile end connection confirmation circuit comprises a second resistance, and the first direct current connection confirmation plug is connected to the equipment ground platform through the second resistance.

[0261] The detection point is located between the first direct current connection confirmation socket and the first resistance.

[0262] In an embodiment, when the voltage of the detection point between the first direct current connection confirmation socket and the first resistance reaches a first preset value, it indicates that the direct current plug is successfully connected to the direct current socket.

[0263] With reference to the above Figure 4 , the first resistance and the second resistance in the embodiment are resistances R5 and R3 respectively, the first voltage source is U2, and the detection point between the first direct current connection confirmation socket and the first resistance is detection point 2.

[0264] Before the direct current socket is connected to the direct current plug, since the detection point 2 is connected to the first voltage source U2, the voltage of the detection point 2 should be the voltage output by the first voltage source U2. Only when the direct current socket is connected to the direct current plug, the first voltage source U2 forms a loop through the resistance R5 in the electric vehicle, the resistance R3 in the charging pile and the grounding wire in the charging pile. Because of the voltage division function of the resistance, the voltage of the detection point 2 reaches the first preset value.

[0265] For example, the voltage output by the first voltage source U2 is set to 12V, and the resistance values of R3 and R5 are equal, so the first preset value is 6V. Under this design, if the voltage of the detection point 2 is 6V, it indicates that the direct current socket is in a connected state with the direct current plug.

[0266] For another example, the voltage output by the first voltage source U2 is still set to 12V, but the resistance values of R3 and R5 are not equal, for example, R3 is 2Ω and R5 is 4Ω, so the first preset value is 4V. Under this design, if the voltage of the detection point 2 is 4V, it indicates that the direct current socket is successfully connected to the direct current plug.

[0267] Therefore, based on the above analysis, if the voltage at detection point 2 is the same as 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.

[0268] In this embodiment, since the detection point is connected to the first voltage source in the electric vehicle, if the voltage at the detection point is the same as the voltage output by the first voltage source, it indicates that the DC socket is not connected to the DC plug. If 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. By judging the connection status of the DC socket and the DC plug based on the voltage at the detection point, the electric vehicle can improve the accuracy of judging the connection status of the DC socket and the DC plug, thereby facilitating the normal charging of the power battery.

[0269] In one embodiment, the electric vehicle further includes a grounding socket, one end of which is used to connect to the grounding plug of the charging pile, and the other end of which is connected to the vehicle body ground platform. The vehicle-end connection confirmation circuit further includes a second vehicle-end connection confirmation circuit, which includes a third resistor. The second DC connection confirmation socket is connected to the vehicle body ground platform through the third resistor.

[0270] The pile connection confirmation circuit also includes a second pile connection confirmation circuit, which includes a fourth resistor and a second voltage source. The second DC connection confirmation plug is connected to the second voltage source through the fourth resistor.

[0271] The test point is located between the second DC connection confirmation plug and the fourth resistor.

[0272] 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.

[0273] Refer to the above Figure 4In the third and fourth resistors of the embodiments 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 with the DC plug, the detection point 1 is connected with the second voltage source U1, and thus the voltage of the detection point 1 should be the voltage output by the second voltage source U1. Only when the DC socket is connected with the DC plug, the current of the second voltage source U1 forms a loop through the resistor R1 in the DC device, the resistor R4 in the electric vehicle and the grounding wire in the electric vehicle. Since the detection point 1 is located between the resistor R1 and the resistor R4, the voltage of the detection point 1 reaches the second preset value due to the voltage division function of the resistors.

[0274] For example, the voltage output by the second voltage source U1 is set to be 12V, and the resistance values of R1 and R4 are equal, and thus the first preset value is 6V. In this design, if the voltage of the detection point 1 is 6V, it indicates that the DC socket is connected with the DC plug.

[0275] For another example, the voltage output by the second voltage source U1 is still set to be 12V, but the resistance values of R1 and R4 are not equal, for example, R1 is 2Ω and R4 is 4Ω, and thus the second preset value is 8V. In this design, if the voltage of the detection point 1 is 8V, it indicates that the DC socket is successfully connected with the DC plug.

[0276] Based on the above analysis, when the voltage of the detection point 1 is the voltage output by the second voltage source U1, it indicates that the DC socket is not connected with the DC plug. When the voltage of the detection point 1 is the first preset value, it indicates that the DC socket is successfully connected with the DC plug.

[0277] In the embodiments of the present application, since the detection points are connected with the second voltage source in the charging pile, when the voltage of the detection point is the voltage output by the second voltage source, it indicates that the DC socket is not connected with the DC plug. When the voltage of the detection point reaches the second preset value, it indicates that the DC socket is connected with the DC plug. The voltages of the two detection points can indicate the connection state of the DC socket and the DC plug, and the electric vehicle and the charging pile can judge the connection state of the DC socket and the DC plug according to the voltages of the two detection points, which can improve the accuracy of the electric vehicle and the charging pile in judging the connection state of the DC socket and the DC plug, and thus is beneficial to the normal charging of the power battery.

[0278] In one embodiment, the second pile end connection confirmation circuit further comprises a normally closed switch located between the fourth resistor and the second DC connection confirmation plug. The detection points comprise two detection points, one of which is located between the fourth resistor and the normally closed switch, and the other of which is located between the second DC connection confirmation plug and the normally closed switch.

[0279] In one embodiment, the voltage of the two detection points reaches the second preset value, indicating that the DC liquid cooling plug is successfully connected with the DC socket.

[0280] Reference Figure 5 In the embodiment, the fourth resistor 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.

[0281] Before the DC socket is connected with the DC plug, since detection point 1 is connected with the second voltage source U1 and the switch S is a normally closed switch, the voltage of detection point 1 and detection point 5 should be the voltage output by the second voltage source U1. Only when the DC socket is connected with the DC plug, the current of the second voltage source U1 forms a loop through the resistor R1 in the DC device, the resistor R4 in the electric vehicle and the grounding wire in the electric vehicle. Since detection point 1 and detection point 5 are located between the resistor R1 and the resistor R4, the voltage of detection point 1 and detection point 5 reaches the second preset value due to the voltage division function of the resistor. There is another possible situation that the DC socket is connected with the DC plug, but the switch S is in the open state. At this time, detection point 1 is connected with the second voltage source U1, and detection point 5 is connected with the grounding wire in the electric vehicle, resulting in that the voltage of detection point 1 is the voltage output by the second voltage source U1, and the voltage of detection point 5 is 0V.

[0282] For example, the voltage output by the second voltage source U1 is set to be 12V, and the resistance values of R1 and R4 are equal, so the second preset value is 6V. In this design, if the voltage of detection point 1 and detection point 5 is 6V, it indicates that the DC socket is successfully connected with the DC plug. If the voltage of detection point 1 is 12V and the voltage of detection point 5 is 0V, it indicates that the DC socket is in the connected state with the DC plug but the switch S is open.

[0283] For another example, the voltage output by the second voltage source U1 is still set to be 12V, but the resistance values of R1 and R4 are not equal, for example, R1 is 2Ω and R4 is 4Ω, so the second preset value is 8V. In this design, if the voltage of detection point 1 and detection point 5 is 8V, it indicates that the DC socket is in the connected state with the DC plug. If the voltage of detection point 1 is 12V and the voltage of detection point 5 is 0V, it indicates that the DC socket is in the connected state with the DC plug but the switch S is open.

[0284] Based on the above analysis, when the voltage of detection point 1 and detection point 5 is the voltage output by the second voltage source U1, it indicates that the DC socket is not connected with the DC plug. When the voltage of detection point 1 and detection point 5 is the second preset value, it indicates that the DC socket is successfully connected with the DC plug. When the voltage of detection point 1 is the voltage output by the second voltage source U1 and the voltage of detection point 5 is 0V, it indicates that the DC socket is connected with the DC plug but the switch S is open.

[0285] In the embodiments of the present application, the voltages of the two detection points indicate the connection state of the DC socket and the DC plug, and the charging pile can determine the connection state of the DC socket and the DC plug according to the voltages of the two detection points, so that the accuracy of the charging pile in determining the connection state of the DC socket and the DC plug can be further improved.

[0286] In an embodiment, the vehicle-end connection confirmation circuit further includes a third vehicle-end connection confirmation circuit, and the third vehicle-end connection confirmation circuit includes a fifth resistor and a first voltage source. The liquid cooling connection confirmation socket is connected to the first voltage source through the fifth resistor. The pile-end connection confirmation circuit includes a third pile-end connection confirmation circuit, and the third pile-end connection confirmation circuit includes a sixth resistor. The liquid cooling connection confirmation plug is connected to the device ground platform through the sixth resistor. The detection point is located between the liquid cooling connection confirmation socket and the fifth resistor.

[0287] In an embodiment, when the voltage of the detection point between the liquid cooling connection confirmation socket and the fifth resistor reaches a third preset value, it indicates that the liquid cooling plug is successfully connected to the liquid cooling socket.

[0288] With reference to Figure 4 , the fifth resistor and the sixth resistor in the embodiments of the present application are R7 and R6, the first voltage source in the electric vehicle is still U2, and 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, the detection point 4 is connected to the first voltage source U2, so the voltage of the detection point 4 should be the voltage output by the first voltage source U2. Only when the liquid cooling socket is connected to the liquid cooling plug, the current of the first voltage source U2 forms a loop through the resistor R7 in the electric vehicle, the resistor R6 in the liquid cooling device, and the ground wire in the liquid cooling device. Because the detection point 4 is located between the resistor R7 and the resistor R6, the voltage of the detection point 4 reaches the third preset value due to the voltage division function of the resistor.

[0289] For example, the voltage output by the first voltage source U2 is set to 12V, and the resistance values of R7 and R6 are equal, so the third preset value is 6V. In this design, if the voltage of the detection point 4 is 6V, it indicates that the liquid cooling socket is in a connected state with the liquid cooling plug.

[0290] For another example, the voltage output by the first voltage source U2 is still set to 12V, but the resistance values of R7 and R6 are not equal, for example, R7 is 2Ω and R6 is 4Ω, so the third preset value is 8V. In this design, if the voltage of the detection point 4 is 8V, it indicates that the liquid cooling socket is in a connected state with the liquid cooling plug.

[0291] Based on the above analysis, when the voltage of the 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 of the detection point 4 is the third preset value, it indicates that the liquid cooling socket is successfully connected to the liquid cooling plug.

[0292] With reference to the foregoing Figure 5 and Figure 6 , Figure 5 and Figure 6 the third connection confirmation circuit shown in Figure 4 is similar to Figure 4 , for brevity, will not be repeated.

[0293] In the embodiment of the present application, since the detection point provided by the present application is connected with the first voltage source in the electric vehicle, in the case that 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 with the liquid cooling plug. In the case that the voltage at the detection point reaches the third preset value, it indicates that the liquid cooling socket is connected with the liquid cooling plug. The voltage at the detection point can indicate the connection state of the liquid cooling socket and the liquid cooling plug, and the electric vehicle judges the connection state of the liquid cooling socket and the liquid cooling plug according to the voltage at the detection point, which can improve the correctness of the electric vehicle in judging the connection state of the liquid cooling socket and the liquid cooling plug, so as to meet the heat dissipation demand of the power battery when it is charged at high power by injecting cooling medium into the power battery through the liquid cooling device to cool the power battery, which is beneficial to improve the charging power of the power battery and reduce the charging time of the electric vehicle.

[0294] In an embodiment, the control guide circuit further comprises a communication circuit, the charging pile further comprises a communication plug, and the vehicle socket further comprises a communication socket. The communication circuit comprises a first communication circuit located in the charging pile and a second communication circuit located in the electric vehicle. One end of the first communication circuit is connected with the controller of the charging pile, and the other end of the first communication circuit is connected with the communication plug. One end of the second communication circuit is connected with the controller of the electric vehicle, and the other end of the second communication circuit is connected with the communication socket.

[0295] In an embodiment, the control guide circuit further comprises an auxiliary power supply circuit, the charging pile further comprises an auxiliary power supply plug, and the vehicle socket further comprises an auxiliary power supply socket. The auxiliary power supply circuit comprises a first auxiliary power supply circuit located in the charging pile and a second auxiliary power supply circuit located in the electric vehicle. One end of the first auxiliary power supply circuit is connected with the controller of the charging pile, and the other end of the first auxiliary power supply circuit is connected with the auxiliary power supply plug. One end of the second auxiliary power supply circuit is connected with the controller of the electric vehicle, and the other end of the second auxiliary power supply circuit is connected with the auxiliary power supply socket.

[0296] For the design of the communication circuit and the auxiliary power supply circuit, please refer to the related content of Figures 4-6 , which will not be repeated.

[0297] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electric vehicle, characterized by The electric vehicle comprises a vehicle socket, a vehicle-end connection confirmation circuit, a power battery and a thermal management system for dissipating heat of the power battery, the vehicle socket comprises a direct-current socket, a liquid-cooling socket and a connection confirmation socket; One end of the direct-current socket is used for connecting a direct-current plug of a charging gun, and the other end of the direct-current socket is connected to the power battery; One end of the liquid-cooling socket is used for connecting a 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 comprises an inlet and an outlet, the inlet is used for transmitting cooling liquid output by the liquid-cooling plug to the thermal management system, and the outlet is used for transmitting cooling liquid output by the thermal management system to the liquid-cooling plug; One end of the connection confirmation socket is used for connecting a connection confirmation plug of the charging gun, and the other end of the connection confirmation socket is connected to the vehicle-end connection confirmation circuit; The electric vehicle is used for judging connection states of the direct-current socket and the direct-current plug and judging connection states of the liquid-cooling socket and the liquid-cooling plug through the vehicle-end connection confirmation circuit; In a case where the liquid-cooling socket and the liquid-cooling plug are successfully connected and the direct-current socket and the direct-current plug are successfully connected, the direct-current socket is used for receiving direct-current power to charge the power battery; wherein The connection confirmation socket comprises a third connection confirmation socket, the vehicle-end connection confirmation circuit comprises a third connection confirmation circuit, the third connection confirmation circuit is used for connecting the connection confirmation plug through the third connection confirmation socket, and the electric vehicle is used for judging the connection states of the liquid-cooling socket and the liquid-cooling plug through the third connection confirmation circuit; The vehicle socket further comprises a plug end, the plug end is used for plugging with the charging gun, and distances from the third connection confirmation socket to the plug end are greater than distances from the inlet to the plug end and distances from the outlet to the plug end, respectively.

2. The electric vehicle of claim 1, wherein, In a case where the liquid-cooling socket and the liquid-cooling plug are connected and the direct-current socket and the direct-current plug are connected, the vehicle-end connection confirmation circuit forms a current loop with a pile-end connection confirmation circuit connected to the connection confirmation socket and the connection confirmation plug, and the electric vehicle is used for judging the connection states of the liquid-cooling socket and the liquid-cooling plug and the connection states of the direct-current socket and the direct-current plug according to a voltage of a detection point in the vehicle-end connection confirmation circuit; In response to the voltage of the detection point reaching a preset value, the electric vehicle judges that the liquid-cooling socket and the liquid-cooling plug are successfully connected and the direct-current socket and the direct-current plug are successfully connected.

3. The electric vehicle of claim 2, wherein, In response to the liquid-cooling socket and the liquid-cooling plug being successfully connected and the direct-current socket and the direct-current plug being successfully connected, the electric vehicle is used for sending a message indicating that the liquid-cooling socket and the liquid-cooling plug are successfully connected and the direct-current socket and the direct-current plug are successfully connected.

4. The electric vehicle of any one of claims 1 to 3, wherein, The connection confirmation socket further comprises a first connection confirmation socket and a second connection confirmation socket, and the vehicle end connection confirmation circuit further comprises a first connection confirmation circuit and a second connection confirmation circuit, wherein the first connection confirmation socket and the second connection confirmation socket are connected to the first connection confirmation circuit and the second connection confirmation circuit respectively. The electric vehicle is configured to determine the connection state of the DC socket and the DC plug through the first connection confirmation circuit or the second connection confirmation circuit.

5. The electric vehicle of claim 4, wherein, The first connection confirmation circuit comprises a first resistance unit, and the first connection confirmation socket is connected to a voltage source through the first resistance unit.

6. The electric vehicle of claim 5, wherein, The electric vehicle is configured to determine the connection state of the DC socket and the DC plug by detecting the voltage of a detection point between the first resistance unit and the first connection confirmation socket. In response to the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle end preset value, the electric vehicle is configured to determine that the DC socket and the DC plug are successfully connected.

7. The electric vehicle according to claim 5 or 6, characterized by The vehicle socket further comprises a grounding socket, one end of the grounding socket is configured to be connected to a grounding plug of the charging gun, and the other end of the grounding socket is connected to a vehicle body ground platform of the electric vehicle. The second connection confirmation circuit comprises 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 electric vehicle of claim 7, wherein, The electric vehicle is further configured to determine the connection state of the DC socket and the DC plug by detecting the voltage of a detection point between the second resistance unit and the second connection confirmation socket. In response to the voltage of the detection point between the first resistance unit and the first connection confirmation socket reaching a first vehicle end preset value, and the voltage of the detection point between the second resistance unit and the second connection confirmation socket reaching a second vehicle end preset value, the electric vehicle is configured to determine that the DC socket and the DC plug are successfully connected.

9. The electric vehicle of claim 4, wherein, The third connection confirmation circuit comprises a third resistance unit, and the third connection confirmation socket is connected to a voltage source through the third resistance unit.

10. The electric vehicle of claim 9, wherein, The electric vehicle is configured to determine the connection state between the liquid cooling socket and the liquid cooling plug by detecting the voltage of a detection point between the third resistance unit and the third connection confirmation socket. In response to the voltage of the detection point between the third resistance unit and the third connection confirmation socket reaching a third vehicle end preset value, the electric vehicle is configured to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

11. The electric vehicle of claim 4, wherein, 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.

12. The electric vehicle of claim 4, wherein, The electric vehicle comprises a traction device configured to pull the charging gun to move so that the vehicle socket and the charging gun are completely connected. The third connection confirmation socket is connected to the plug end at a distance equal to the distance between the second connection confirmation socket and the plug end, the distance between the liquid inlet and the plug end, and the distance between the liquid outlet and the plug end are less than the distance between the third connection confirmation socket and the plug end, and the distance between the liquid inlet and the plug end, and the distance between the liquid outlet and the plug end are greater than or equal to the distance between the first connection confirmation socket and the plug end.

13. The electric vehicle of any one of claims 1-3, wherein, The electric vehicle further comprises a vehicle controller, and the vehicle socket further comprises a communication socket, one end of the communication socket being used for connecting the charging gun, and the other end of the communication socket being connected to the vehicle controller.

14. The electric vehicle of any one of claims 1-3, wherein, The vehicle socket further comprises an auxiliary power socket, one end of the auxiliary power socket being used for connecting the auxiliary power plug of the charging gun, and the other end of the auxiliary power socket being used for receiving direct current.

15. The electric vehicle of any one of claims 1-3, wherein, The direct current socket is connected to the power battery through two charging circuit contactors.

16. The electric vehicle of any one of claims 1-3, wherein, The electric vehicle is used for: In the case that 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, a message for requesting the charging pile to output a first charging power is sent to the charging pile; or, In the case that the direct current socket is successfully connected to the direct current plug, a message for requesting the charging pile to output a second charging power is sent to the charging pile, the second charging power being less than the first charging power.

17. A charging gun applied to a charging pile, characterized in that, The charging gun comprises a charging plug and a pile end connection confirmation circuit, and the charging plug comprises a direct current plug, a liquid cooling plug and a connection confirmation plug. One end of the direct current plug is used for connecting a direct current socket of an electric vehicle, and the other end of the direct current plug is used for connecting a power conversion device of the charging pile. One end of the liquid cooling plug is used for connecting a liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is used for connecting a liquid cooling device of the charging pile, the liquid cooling plug comprising a liquid outlet and a liquid inlet, the liquid outlet being used for transmitting cooling liquid in the liquid cooling device to the liquid cooling socket, and the liquid inlet being used for transmitting cooling liquid output by the liquid cooling socket to the liquid cooling device. One end of the connection confirmation plug is used for connecting a connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is used for connecting the pile end connection confirmation circuit. The connection confirmation plug comprises a third connection confirmation plug, and the pile end connection confirmation circuit comprises a third connection confirmation circuit, the third connection confirmation circuit being used for forming a current loop with a vehicle end connection confirmation circuit connected to the connection confirmation socket through the third connection confirmation plug, so that the electric vehicle judges the connection state of the liquid cooling plug and the liquid cooling socket through the formed current loop. The charging gun further comprises a plug end, the plug end being used for plugging with the electric vehicle, and the distance between the third connection confirmation plug and the plug end is greater than the distance between the liquid inlet and the plug end and the distance between the liquid outlet and the plug end, respectively.

18. The charging gun of claim 17, wherein, In the case that the liquid cooling plug is connected with the liquid cooling socket and the direct current plug is connected with the direct current socket, the pile end connection confirmation circuit forms a current loop with the connection confirmation plug and the connection confirmation socket and the vehicle end connection confirmation circuit, and the charging pile connected with the charging gun is used to detect the voltage of the detection point in the pile end connection confirmation circuit to determine the connection state of the direct current plug and the direct current socket.

19. The charging gun of claim 18, wherein, The connection confirmation plug further comprises a first connection confirmation plug and a second connection confirmation plug, and the pile end connection confirmation circuit further comprises a first connection confirmation circuit and a second connection confirmation circuit, and the first connection confirmation plug and the second connection confirmation plug are connected with the first connection confirmation circuit and the second connection confirmation circuit respectively. The first connection confirmation circuit comprises a fourth resistance unit, and the first connection confirmation plug is connected with the device ground platform of the charging pile through the fourth resistance unit. The second connection confirmation circuit comprises a fifth resistance unit, and the second connection confirmation plug is connected with 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 comprises a sixth resistance unit, and the third connection confirmation plug is connected with the device ground platform through the sixth resistance unit.

20. The charging gun of claim 19, wherein, The second connection confirmation circuit further comprises a normally closed switch, and the normally closed switch is located between the fifth resistance unit and the second connection confirmation plug.

21. The charging gun of claim 20, wherein, The detection point comprises 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.

22. The charging gun of any one of claims 19-21, wherein, 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.

23. The charging gun of claim 22, wherein, 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 to the plug-in end and the distance from the liquid outlet to the plug-in end are respectively less than the distance from the third connection confirmation plug to the plug-in end, and the distance from the liquid inlet to the plug-in end and the distance from the liquid outlet to the plug-in end are respectively greater than or equal to the distance from the first connection confirmation plug to the plug-in end.

24. The charging gun of any one of claims 17 to 21, wherein, The charging plug further comprises a communication plug, one end of the communication plug is used to connect the communication socket of the electric vehicle, and the other end of the communication plug is connected with the controller of the charging pile.

25. The charging gun of any one of claims 17-21, wherein, The charging plug further comprises an auxiliary power supply plug, one end of the auxiliary power supply plug is used to connect the auxiliary power supply socket of the electric vehicle, and the other end of the auxiliary power supply plug is used to send direct current.

26. The charging gun of any one of claims 17-21, wherein, The direct current plug is connected with the power conversion device through two direct current power supply circuit breakers.

27. A charging station, characterized in that The charging pile comprises a charging gun, a liquid cooling device and a power conversion device, the charging gun is connected with the power conversion device and the liquid cooling device, the charging gun comprises a charging plug and a pile end connection confirmation circuit, and the charging plug comprises a direct current plug, a liquid cooling plug and a connection confirmation plug. One end of the DC plug is used to connect a DC socket of an electric vehicle, and the other end of the DC plug is connected to the power conversion device; One end of the liquid cooling plug is used to connect a liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling device, the liquid cooling plug comprising a liquid inlet and a liquid outlet, the liquid outlet being used to transmit the cooling liquid in the liquid cooling device to the liquid cooling socket, and the liquid inlet being used to transmit the cooling liquid output by the liquid cooling socket to the liquid cooling device; One end of the connection confirmation plug is used to connect a connection confirmation socket of the electric vehicle, and the other end of the connection confirmation plug is connected to the pile-end connection confirmation circuit; In a case where 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 is used to output DC power to charge the electric vehicle; The connection confirmation plug comprises a third connection confirmation plug, and the pile-end connection confirmation circuit comprises a third connection confirmation circuit, the third connection confirmation circuit being used to form a current loop with a vehicle-end connection confirmation circuit connected to the connection confirmation socket through the third connection confirmation plug, so that the electric vehicle judges the connection state of the liquid cooling plug and the liquid cooling socket through the formed current loop; The charging pile further comprises a plug end, the plug end being used to be plugged into the electric vehicle, and distances from the third connection confirmation plug to the plug end are greater than distances from the liquid inlet and the liquid outlet to the plug end, respectively.

28. The charging station of claim 27, wherein, In a case where the liquid cooling plug is connected to the liquid cooling socket and the DC plug is connected to the DC socket, the pile-end connection confirmation circuit forms a current loop with the vehicle-end connection confirmation circuit through the connection confirmation plug and the connection confirmation socket, and the charging pile is used to detect a voltage of a detection point in the pile-end connection confirmation circuit to judge the connection state of the DC plug and the DC socket. In response to the voltage of the detection point reaching a preset value, the charging pile judges that the DC plug is successfully connected to the DC socket.

29. The charging station of claim 28, wherein, The charging pile is used to receive a message indicating that the liquid cooling socket is successfully connected to the liquid cooling plug.

30. The charging post of claim 28 or 29, wherein, The connection confirmation plug further comprises a first connection confirmation plug and a second connection confirmation plug, and the pile-end connection confirmation circuit further comprises a first connection confirmation circuit and a second connection confirmation circuit, the first connection confirmation plug and the second connection confirmation plug being connected to the first connection confirmation circuit and the second connection confirmation circuit, respectively. The first connection confirmation circuit comprises a fourth resistance unit, and the first connection confirmation plug is connected to a 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 comprises a sixth resistance unit, and the third connection confirmation plug is connected to the device ground platform through the sixth resistance unit.

31. The charging station of claim 30, wherein, The charging pile is used for judging 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 of the detection point between the fifth resistance unit and the second connection confirmation plug reaching a preset value at the end of the pile, the charging pile judges that the DC plug and the DC socket are successfully connected.

32. The charging station of claim 30, wherein, The second connection confirmation circuit further comprises a normally closed switch between the fifth resistance unit and the second connection confirmation plug.

33. The charging station of claim 32, wherein, The detection point comprises a detection point between the fifth resistance unit and the normally closed switch, and a detection point between the normally closed switch and the second connection confirmation plug.

34. The charging post of claim 32 or 33, wherein, The charging pile is used for judging 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 of the detection point between the fifth resistance unit and the normally closed switch, and the voltage of the detection point between the normally closed switch and the second connection confirmation plug reaching a preset value at the end of the pile, the charging pile is used for judging that the DC plug and the DC socket are successfully connected.

Images