Control guide circuits used in electric vehicles and liquid cooling equipment

Abstract

This application provides a control guidance circuit for electric vehicles and liquid cooling equipment. The control guidance circuit includes a connection confirmation circuit. The electric vehicle includes a liquid cooling socket and a liquid cooling connection confirmation socket, and the liquid cooling equipment includes a liquid cooling plug and a liquid cooling connection confirmation plug. When the liquid cooling plug is connected to the liquid cooling socket, the vehicle-side connection confirmation circuit and the charging pile-side connection confirmation circuit form a loop. The voltage at the detection point in the loop is used to indicate the connection status between the liquid cooling plug and the liquid cooling socket. This 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] This application relates to the field of new energy vehicles, and in particular to a control guide circuit for electric vehicles and liquid cooling equipment. Background Technology

[0002] With breakthroughs in high-power battery charging technology, it is now possible to fully charge batteries in a short time. However, in current practical applications, when a charging device performs high-power charging on a power battery, the heat generated by the battery increases significantly. If this heat cannot be dissipated in time, it will affect the normal operation of the charging device during high-power charging.

[0003] 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. Summary of the Invention

[0004] This application provides a control and guidance circuit for electric vehicles and liquid cooling equipment. When the charging device is charging the power battery of the electric vehicle at high power, the liquid cooling equipment under the vehicle can deliver coolant 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 control guidance circuit for electric vehicles and liquid-cooled equipment is provided. The control guidance circuit includes a connection confirmation circuit. The electric vehicle includes a liquid-cooled socket and a liquid-cooled connection confirmation socket, and the liquid-cooled equipment includes a liquid-cooled plug and a liquid-cooled connection confirmation plug. One end of the liquid-cooled socket is used to connect to one end of the liquid-cooled plug, and the other end of the liquid-cooled socket is used to connect to the thermal management system of the electric vehicle's power battery. The other end of the liquid-cooled plug is used to receive or output coolant. The connection confirmation circuit includes a vehicle-side connection confirmation circuit located in the electric vehicle and a terminal-side connection confirmation circuit located in the liquid-cooled equipment. The vehicle-side connection confirmation circuit is connected to the liquid-cooled socket, and the terminal-side connection confirmation circuit is connected to the liquid-cooled plug. When the liquid-cooled plug is connected to the liquid-cooled socket, the vehicle-side connection confirmation circuit and the terminal-side connection confirmation circuit form a loop. The voltage at a detection point in the loop is used to indicate the connection status between the liquid-cooled plug and the liquid-cooled socket.

[0006] In this embodiment, the voltage at the detection point in the control guide circuit can indicate the connection status between the liquid-cooled plug and the liquid-cooled socket. Therefore, when the voltage at the detection point indicates a successful connection between the liquid-cooled socket and the liquid-cooled plug, when the charging pile charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium, thereby solving the heat dissipation problem during power battery charging and improving the charging power of the charging device for the power battery.

[0007] In conjunction with the first aspect, in one possible design, the liquid cooling equipment also includes a grounding plug, and the electric vehicle also includes a grounding socket. One end of the grounding plug is used to connect to one end of the grounding socket, and the other end of the grounding plug is used to connect to the equipment ground platform. The other end of the grounding socket is used to connect to the vehicle body ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket. The liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The vehicle-end connection confirmation circuit includes a first vehicle-end connection confirmation circuit, which includes a first resistor and a first voltage source. The first liquid cooling connection confirmation socket is connected to the first voltage source through the first resistor. The pile-end connection confirmation circuit includes a first pile-end connection confirmation circuit, which includes a second resistor. The first liquid cooling connection confirmation plug is connected to the equipment ground platform through the second resistor. The detection point is located between the first liquid cooling connection confirmation socket and the first resistor.

[0008] In conjunction with the first aspect, in one possible design, the voltage at the detection point between the first liquid-cooled connection confirmation socket and the first resistor reaches a first preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0009] 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 liquid-cooled socket is not connected to the liquid-cooled plug. If the voltage at the detection point reaches a first preset value, it indicates that the liquid-cooled socket and the liquid-cooled plug are connected. The voltage at the detection point can indicate the connection status of the liquid-cooled socket and the liquid-cooled plug. When the voltage at the detection point indicates that the liquid-cooled socket and the liquid-cooled plug are successfully connected, when the charging pile charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0010] In conjunction with the first aspect, in one possible design, the electric vehicle also includes a grounding socket. One end of the grounding socket is used to connect to the grounding plug of the liquid cooling gun, and the other end is connected to the vehicle's ground platform. The vehicle-end connection confirmation circuit also includes a second vehicle-end connection confirmation circuit, which includes a third resistor. The second liquid cooling connection confirmation socket is connected to the vehicle's ground platform through the third resistor. The pile-end connection confirmation circuit also includes a second pile-end connection confirmation circuit, which includes a fourth resistor and a second voltage source. The second liquid cooling connection confirmation plug is connected to the second voltage source through the fourth resistor. The detection point is located between the second liquid cooling connection confirmation plug and the fourth resistor.

[0011] In conjunction with the first aspect, in one possible design, the voltage at the detection point between the first liquid-cooled connection confirmation socket and the first resistor reaches a first preset value, and the voltage at the detection point between the second liquid-cooled connection confirmation plug and the fourth resistor reaches a second preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0012] In this embodiment, since the detection points are connected to a voltage source, if the voltage at the detection point is the same as the voltage output by the voltage source, it indicates that the liquid-cooled socket is not connected to the liquid-cooled plug. If the voltages at the two detection points reach a first preset value and a second preset value respectively, it indicates that the liquid-cooled socket and the liquid-cooled plug are connected. The voltage at the detection points indicates the connection status of the liquid-cooled socket and the liquid-cooled plug. When the voltage at the detection points indicates a successful connection, the liquid-cooling device cools the power battery by injecting a cooling medium into the battery when the charging pile charges it at high power. This meets the heat dissipation requirements of the power battery during high-power charging, improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0013] In conjunction with the first aspect, in one possible design, the second terminal connection confirmation circuit also includes a normally closed switch located between the fourth resistor and the second liquid-cooled connection confirmation plug.

[0014] In conjunction with the first aspect, in one possible design, the detection point includes two detection points, one of which is located between the fourth resistor and the normally closed switch, and the other of which is located between the second liquid-cooled connection confirmation plug and the normally closed switch.

[0015] In conjunction with the first aspect, in one possible design, the voltage at the detection point between the fourth resistor and the normally closed switch, and at the detection point between the second liquid-cooled connection confirmation plug and the normally closed switch, both reach the second preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0016] In this embodiment, the voltage indicators at the two detection points indicate the connection status of the liquid-cooled socket and the liquid-cooled plug, which can improve the accuracy of the liquid-cooling device in judging the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltage at these two detection points. When the charging device charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0017] In conjunction with the first aspect, in one possible design, the electric vehicle also includes a grounding socket. One end of the grounding socket is used to connect to the grounding plug of the liquid cooling gun, and the other end is connected to the vehicle's ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket. The liquid cooling connection confirmation plug also includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The vehicle-end connection confirmation circuit includes a third vehicle-end connection confirmation circuit and a fourth vehicle-end connection confirmation circuit. The third vehicle-end connection confirmation circuit includes a fifth resistor and a third voltage source. The first liquid cooling connection confirmation socket is connected to the third voltage source through the fifth resistor, and the second liquid cooling connection confirmation socket is connected to the vehicle's ground platform. The pile-end connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire. The detection point is located between the fifth resistor and the first liquid cooling connection confirmation socket.

[0018] In conjunction with the first aspect, in one possible design, the voltage at the detection point between the fifth resistor and the first liquid-cooled connection confirmation socket reaches a third preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0019] In this embodiment, the electric vehicle can determine that the liquid-cooled plug and liquid-cooled socket are successfully connected based on the voltage at the detection point between the fifth resistor and the first liquid-cooled connection confirmation socket reaching a preset value. When the charging device charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle. In addition, the circuit design of the vehicle-side connection confirmation circuit and the charging pile-side connection confirmation circuit in this embodiment is simple and can be greatly simplified.

[0020] In conjunction with the first aspect, in one possible design, the electric vehicle also includes a grounding socket. One end of the grounding socket is used to connect to the grounding plug of the liquid cooling gun, and the other end is connected to the vehicle's ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket. The liquid cooling connection confirmation plug also includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The vehicle-end connection confirmation circuit includes a fifth vehicle-end connection confirmation circuit and a sixth vehicle-end connection confirmation circuit. The fifth vehicle-end connection confirmation circuit includes a fourth voltage source, and the sixth vehicle-end connection confirmation circuit includes a sixth resistor. The first liquid cooling connection confirmation socket is connected to the fourth voltage source, and the second liquid cooling connection confirmation socket is connected to the vehicle's ground platform through the sixth resistor. The terminal connection confirmation circuit includes a wire, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wire. The detection point is located between the sixth resistor and the second liquid cooling connection confirmation socket.

[0021] In conjunction with the first aspect, in one possible design, the voltage at the detection point between the sixth resistor and the second liquid-cooled connection confirmation socket reaches the fourth preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0022] In this embodiment, the electric vehicle can determine that the liquid-cooled plug and liquid-cooled socket are successfully connected based on the voltage at the detection point between the sixth resistor and the second liquid-cooled connection confirmation socket reaching a fourth preset value. When the charging device charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle. In addition, the circuit design of the vehicle-side connection confirmation circuit and the charging pile-side connection confirmation circuit in this embodiment is simple and can be greatly simplified.

[0023] In conjunction with the first aspect, in one possible design, the control guidance circuit also includes a communication circuit, the liquid cooling device also includes a communication plug, and the vehicle socket also includes a communication socket. The communication circuit includes a first communication circuit located in the liquid cooling device and a second communication circuit located in the electric vehicle. One end of the first communication circuit is connected to the controller of the liquid cooling device, and the other end of the first communication circuit is connected to the communication plug. One end of the second communication circuit is connected to the controller of the electric vehicle, and the other end of the second communication circuit is connected to the communication socket.

[0024] In conjunction with the first aspect, in one possible design, the control guidance circuit further includes an auxiliary power supply circuit, the liquid cooling device further includes an auxiliary power plug, and the vehicle socket further includes an auxiliary power socket. The auxiliary power supply circuit includes a first auxiliary power supply circuit located in the liquid cooling device and a second auxiliary power supply circuit located in the electric vehicle. One end of the first auxiliary power supply circuit is connected to the controller of the liquid cooling device, and the other end of the first auxiliary power supply circuit is connected to the auxiliary power plug. One end of the second auxiliary power supply circuit is connected to the controller of the electric vehicle, and the other end of the second auxiliary power supply circuit is connected to the auxiliary power socket. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a charging system provided in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of another charging system provided in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of a heat dissipation system provided in an embodiment of this application.

[0028] Figure 4 A schematic diagram of another heat dissipation system provided in an embodiment of this application.

[0029] Figure 5 A schematic diagram of another heat dissipation system provided in the embodiments of this application.

[0030] Figure 6 A schematic diagram of another heat dissipation system provided in the embodiments of this application.

[0031] Figure 7 This is a schematic diagram of another charging system provided in an embodiment of this application.

[0032] Figure 8 This is a schematic diagram of an injection interface provided in an embodiment of this application.

[0033] Figure 9 This is another schematic diagram of the injection interface provided in an embodiment of this application.

[0034] Figure 10 This is a schematic diagram of another heat dissipation system provided in an embodiment of this application.

[0035] Figure 11 This is a schematic diagram of another heat dissipation system provided in an embodiment of this application.

[0036] Figure 12 This is a schematic diagram of another heat dissipation system provided in an embodiment of this application. Detailed Implementation

[0037] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0038] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0039] References to “some embodiments” and the like in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. Therefore, phrases such as “some embodiments” appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean “one or more, but not all, embodiments”, unless otherwise specifically emphasized. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0040] The term "equal to" in this application is not equal in the strict sense, but rather within the allowable range of error.

[0041] With the development of new energy vehicle technology, many car manufacturers have gradually launched electric vehicles. Electric vehicles have become the choice of many users due to their energy saving, environmental protection and relatively mature technology.

[0042] This application can be applied to systems where power supply devices and loads charge each other through a power distribution matrix. In particular, it is applicable to systems including charging stations and electric vehicles, where charging stations can use electricity from the grid to charge electric vehicles, and electric vehicles can also output their own electrical energy back to the grid.

[0043] Figure 1 An exemplary schematic diagram of the structure of the charging system 10 provided in an embodiment of this application is shown.

[0044] Combination Figure 1 (a) and Figure 1 In (b), the charging system 10 may include a charging device 11 and a vehicle 12.

[0045] In some embodiments, such as Figure 1 As shown in (a), the charging device 11 can be a split device. Specifically, the charging device 11 may include a charging host 111, at least one charging terminal 112, and at least one charging gun 113. The charging host 111 is electrically connected to each charging terminal 112, and each charging terminal 112 is electrically connected to the charging gun 113 via a cable. The charging gun 113 is used to electrically connect to the electric vehicle 12.

[0046] The charging host 111 includes multiple power conversion devices that can convert AC power from the external power grid 20 into DC power and then supply it to the charging terminal 112, which in turn supplies it to the electric vehicle 12 via a charging gun 113 electrically connected to the charging terminal 112. These power conversion devices may include, for example, alternating current-to-direct current (AC-DC) converters and direct current-to-direct current (DC-DC) converters.

[0047] In practice, the user can insert the charging gun 113 into the charging port of the electric vehicle 12, so that the charging gun 113 can be electrically connected to the power battery of the electric vehicle 12, and the charging host 111 can then charge the power battery of the electric vehicle 12 through the charging gun 113.

[0048] The charging terminal 112 may include a housing, a human-machine interface, a charging control unit, a metering and billing unit, etc. The charging terminal 112 can be used to interact with the vehicle 12, transmit energy, and perform metering and billing.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Based on this, this application provides a charging system including a charging pile and an electric vehicle. The charging pile includes a charging device and a liquid cooling device. When the charging device is charging the electric vehicle's power battery at high power, the liquid cooling device can deliver coolant to the power battery's thermal management system, thereby solving the heat dissipation problem during power battery charging and improving the charging power of the charging device for the power battery.

[0054] Figure 2 This is a schematic diagram of the structure of a charging system 200 provided in an embodiment of this application. It should be understood that... Figure 2 In Chinese, a thin solid line is used to connect power transmission lines, and a short dashed line is used to connect conduits and lines.

[0055] The charging system 200 may include an electric vehicle 300 and a charging pile 400. The electric vehicle 300 may include an on-board charging connection device 310 and a power battery 320, and the charging pile 400 may include a charging device 410 and a liquid cooling device 420.

[0056] Understandably, electric vehicles 300 can be Figure 1 The electric vehicle 12 shown may have a charging device 410. Figure 1 The split charging device shown in (a) is, or Figure 1 The integrated charging device is shown in (b) above. For ease of description and understanding, the embodiments of this application use charging device 410 as an example. Figure 1 The split-type charging device shown in (a) is used as an example for explanation.

[0057] It is also understood that the liquid cooling device 420 can be disposed outside the charging device 410 or integrated with the charging device 410. For ease of description and understanding, this application embodiment uses the example of the liquid cooling device 420 being disposed outside the charging device 410 for illustration.

[0058] Continue to refer to Figure 2 The vehicle-mounted charging connection device 310 may include a vehicle-end charging interface 311, a DC output interface 312, a first liquid inlet / outlet 313, and a second liquid inlet / outlet 314. The charging device 410 may include a charging pile-end interface 411. The liquid cooling device 420 may include a liquid cooling system 422 and a liquid cooling inlet / outlet 421.

[0059] The charging pile terminal interface 411 can be electrically connected to the vehicle-side charging interface 311. The vehicle-side charging interface 311 is electrically connected to the power battery 320 via a DC output interface 312, allowing the charging device 410 to transmit power to the power battery 320 via the on-board charging connection device 310. For example, the charging device 410 can output DC power from the charging pile terminal interface 411, and the on-board charging connection device 310 can transmit the DC power output from the charging pile terminal interface 411 to the power battery 320 via the DC output interface 312 to charge the power battery 320. Alternatively, the power battery 320 can output DC power to the DC output interface 312, and the on-board charging connection device 310 can transmit the DC power output from the power battery 320 to the charging device 410 via the vehicle-side charging interface 311, thereby enabling the power battery 320 to discharge to the charging device 410.

[0060] In some embodiments, the number of charging pile end interfaces 411 and vehicle end interfaces 311 can each be one or more. In specific implementations, such as... Figure 2 As shown, the split-type charging device 410 may include a charging host 412 and at least one charging terminal 413 electrically connected to the charging host 412. Each charging terminal 413 may be electrically connected to a charging gun (not shown in the figure) via a cable. The charging port 411 may be a charging plug provided in each charging gun, and the vehicle-side charging port 311 may be a charging socket provided on the vehicle-mounted charging connection device 310.

[0061] The liquid cooling inlet / outlet 421 can be connected to the first inlet / outlet 313. The first inlet / outlet 313 can be connected to the power battery 320 through the second inlet / outlet 314, so that the liquid cooling device 420 can transfer liquid phase cooling medium to the power battery 320 through the vehicle charging connection device 310 to achieve cooling of the power battery 320.

[0062] In a specific implementation, the liquid cooling device 420 may include a liquid cooling system 422 and a liquid cooling gun (not shown in the figure) connected to the liquid cooling device 422. The liquid cooling inlet and outlet 421 may be a liquid cooling connector plug provided in the liquid cooling gun, and the first inlet and outlet 313 may be a liquid cooling connector socket provided on the vehicle charging connector 310.

[0063] In this embodiment, by providing a separate on-board charging connection device 310 in the electric vehicle 300, the on-board charging connection device 310 has a vehicle-side charging interface 311 for electrical connection with the charging device 410 and a first liquid inlet / outlet 313 for connection with the liquid cooling device 420, allowing the power battery 320 to be directly connected to both the charging device 410 and the liquid cooling device 420 simultaneously via the on-board charging connection device 310. In this way, when the power battery is charged at high power by the charging device 410, the external liquid cooling device 420 can be connected to the power battery 320, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging, which helps to improve the charging power of the power battery 320 and reduce the charging time of the electric vehicle.

[0064] This application mainly relates to the identification of the connection status between the liquid cooling device 420 and the power battery. Therefore, the solution of this application will be introduced below using the liquid cooling device and the electric vehicle as examples.

[0065] Figure 3 This is a schematic diagram of a heat dissipation system provided in an embodiment of this application. (In conjunction with...) Figure 3 The cooling system includes an electric vehicle 300 and a liquid cooling device 420. Among them, Figure 3 The liquid cooling interface includes Figure 2 The liquid cooling plug includes a liquid cooling inlet / outlet port 421 and a first liquid cooling inlet / outlet port 313. The liquid cooling plug may include a liquid cooling inlet / outlet port 412, and the liquid cooling socket includes the first liquid cooling inlet / outlet port 312. In addition, the liquid cooling plug may also include a connection confirmation port and a connection confirmation circuit connected to the connection confirmation port, and the liquid cooling socket may also include a connection confirmation port and a connection confirmation circuit connected to the connection confirmation port.

[0066] In one embodiment, the connection confirmation circuit in the liquid cooling device can be connected to the liquid cooling controller 423, which determines the connection status of the liquid cooling plug and the liquid cooling socket through the connection confirmation circuit in the liquid cooling device. Similarly, the connection confirmation circuit in the electric vehicle can be connected to the on-board controller 330, which determines the connection status of the liquid cooling socket and the liquid cooling plug through the connection confirmation circuit in the electric vehicle.

[0067] The following sections will use on-board charging connection devices, electric vehicles, liquid cooling equipment, charging piles, and control and guidance circuits as examples to illustrate the concepts.

[0068] First, this application provides an on-board charging connection device, which is applied to an electric vehicle. The on-board charging connection device includes a first vehicle socket and a liquid-cooled connection confirmation circuit. The first vehicle socket includes a liquid-cooled socket and a liquid-cooled connection confirmation socket.

[0069] One end of the liquid cooling socket is used to connect to the liquid cooling plug of the liquid cooling gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery through liquid cooling pipes. The liquid cooling socket is used to receive coolant output from the liquid cooling plug, or to output coolant to the liquid cooling plug. One end of the liquid cooling connection confirmation socket is used to connect to the liquid cooling connection confirmation plug of the liquid cooling gun, and the other end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit.

[0070] 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 liquid-cooled connection confirmation circuit.

[0071] In this embodiment, the liquid-cooled socket may include an inlet and an outlet, i.e., an inlet and an outlet. The inlet of the liquid-cooled socket is connected to the outlet of the liquid-cooled plug, and the outlet of the liquid-cooled socket is connected to the return port of the liquid-cooled plug. This allows the cooling medium of the liquid-cooling device to be input into the thermal management system of the power battery through the liquid-cooled plug and the liquid-cooled socket, thereby cooling the power battery.

[0072] In existing technologies, the connection port of the under-vehicle cooling system is only a single inlet / outlet. When the charging pile is charging the electric vehicle's power battery, the electric vehicle and the under-vehicle cooling system cannot recognize whether they are connected, which affects the normal high-power charging of the power battery by the charging pile. In this embodiment, the liquid-cooled socket includes not only the inlet / outlet but also a liquid-cooled connection confirmation socket. Since the liquid-cooled connection confirmation socket is connected to the liquid-cooled 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 liquid-cooled connection confirmation circuit. When the liquid-cooled socket and the liquid-cooled plug are successfully connected, when the charging device charges the power battery at high power, the liquid-cooling device cools the power battery by injecting cooling medium into the power battery's thermal management system.

[0073] In one embodiment, when the liquid-cooled socket is connected to the liquid-cooled plug and the DC socket is connected to the DC plug, the liquid-cooled connection confirmation circuit in the on-board charging connection device forms a current loop with the liquid-cooled connection confirmation socket and the liquid-cooled connection confirmation plug.

[0074] The on-board charging connection device is used to detect the voltage at the detection point in the liquid cooling connection confirmation circuit to determine the connection status of the liquid cooling socket and the liquid cooling plug. When the voltage at the detection point in the liquid cooling connection confirmation circuit reaches a preset value on the vehicle side, the on-board charging connection device determines that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0075] In this embodiment, when the liquid-cooled socket and liquid-cooled plug are connected, the liquid-cooled connection confirmation circuit forms a current loop with the liquid-cooled device's liquid-cooled connection confirmation circuit through the liquid-cooled connection confirmation socket and liquid-cooled connection confirmation plug. A detection point can be set in this current loop; when the voltage at the detection point reaches a preset value at the vehicle end, the on-board charging connection device determines that the liquid-cooled socket and liquid-cooled plug are successfully connected.

[0076] With this design, the on-board charging connection device can determine the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltage of the detection point. When the liquid-cooled socket and the liquid-cooled plug are successfully connected, the liquid cooling system can cool the power battery by injecting a cooling medium into the power battery when the charging pile charges the power battery at high power. This can meet the heat dissipation requirements of the power battery when charging at high power, which is conducive to improving the charging power of the power battery and reducing the charging time of electric vehicles.

[0077] The vehicle-side preset value in this embodiment is related to the specific circuit configuration of the liquid cooling connection confirmation circuit and the location of the detection point. Please refer to the following section for details. Figures 4-7 The content.

[0078] The following section will describe, with reference to the accompanying drawings, the specific circuit configuration of the liquid cooling connection confirmation circuit and the strategy employed by the on-board charging connection device to determine the connection status of the liquid cooling socket and the liquid cooling plug.

[0079] In one embodiment, the liquid-cooled connection confirmation socket includes a first liquid-cooled connection confirmation socket, the liquid-cooled connection confirmation circuit includes a first liquid-cooled connection confirmation circuit, and the first liquid-cooled connection confirmation socket is connected to the first liquid-cooled connection confirmation circuit.

[0080] The first liquid-cooled connection confirmation circuit includes a first resistor unit, and the first liquid-cooled connection confirmation socket is connected to a voltage source through the first resistor unit.

[0081] In response to the voltage at the detection point in the liquid cooling connection confirmation circuit reaching the first vehicle-side preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected, including: in response to the voltage at the detection point between the first resistor unit and the first liquid cooling connection confirmation socket reaching the first vehicle-side preset value, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0082] like Figure 4 The diagram shown is a schematic of a heat dissipation system provided in an embodiment of this application. The first resistor unit includes resistor R5, the first liquid cooling connection confirmation socket is a socket corresponding to port CC2, and the voltage source is U2. The detection point between the first resistor unit and the first liquid cooling connection confirmation socket is detection point 2.

[0083] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at detection point 2 should be the output voltage of voltage source U2 since detection point 2 is connected to voltage source U2. Only when the liquid-cooled socket is connected to the liquid-cooled plug will voltage source U2 form a circuit through resistor R5 in the electric vehicle, resistor R3 in the charging pile, and grounding wire in the charging pile. Due to the voltage division function of the resistors, the voltage at detection point 2 will reach the preset value at the first vehicle end.

[0084] For example, if the voltage output of voltage source U2 is set to 12V, and the resistance values ​​of R3 and R5 are equal, then the preset value at the first vehicle end is 6V. Under this design, if the voltage at detection point 2 is 6V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0085] For example, the voltage output of voltage source U2 is still set to 12V, but the resistance values ​​of R3 and R5 are different, such as R3 being 2Ω and R5 being 4Ω, then the preset value at the first vehicle end is 4V. Under this design, if the voltage at detection point 2 is 4V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0086] Therefore, based on the above analysis, when the voltage at detection point 2 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 2 reaches the first preset value at the vehicle end, the on-board charging connection device can identify that the liquid-cooled socket is connected to the liquid-cooled plug.

[0087] 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-cooled socket is not connected to the liquid-cooled plug. When the voltage at the detection point reaches a preset value at the first vehicle end, the on-board charging connection device identifies that the liquid-cooled socket is connected to the liquid-cooled plug. By identifying the connection status of the liquid-cooled socket and liquid-cooled plug based on the voltage at the detection point, the accuracy of the on-board charging connection device in identifying the connection status of the liquid-cooled socket and liquid-cooled plug can be improved. 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.

[0088] The above embodiment illustrates that when the voltage at detection point 2 reaches the first vehicle-side preset value, the on-board charging connection device determines that the liquid-cooled socket and liquid-cooled plug are in a connected state. Furthermore, the on-board charging connection device can also determine the connection state between the first resistor unit and the voltage source based on the specific voltage value at detection point 2.

[0089] For example, if the internal contact of the electric vehicle is good, because detection point 2 is located between resistors R5 and R3, and due to the voltage division function of the resistors, the voltage at detection point 2 should be greater than 0 and less than the output voltage of the voltage source (i.e., the preset value at the first vehicle end). For example, if the voltage output of the voltage source is 12V, and the resistance values ​​of R5 and R3 are equal, then the voltage at detection point 2 will be 6V.

[0090] If there is poor contact inside the electric vehicle, for example, if R5 is not connected to the voltage source U2 and is in a floating state, it is equivalent to R5 and R3 being directly connected to the grounding wire in the liquid cooling equipment. The voltage at any test point on this branch of R5, R3, and the grounding wire will be 0V. Because test point 2 is located on the branch formed by resistors R5 and R3 and the grounding wire, the voltage at test point 2 will also be 0V.

[0091] 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 2, which is beneficial to improving the safety of the electric vehicle.

[0092] In one embodiment, the vehicle socket further includes a grounding socket, one end of which is used to connect to the grounding plug of the liquid cooling gun, and the other end of which is connected to the vehicle body platform.

[0093] The liquid-cooled connection confirmation socket also includes a second liquid-cooled connection confirmation socket, and the liquid-cooled connection confirmation circuit also includes a second liquid-cooled connection confirmation circuit. The second liquid-cooled connection confirmation socket is connected to the second liquid-cooled connection confirmation circuit.

[0094] The second liquid-cooled connection confirmation circuit includes a second resistor unit, and the second liquid-cooled connection confirmation socket is connected to the vehicle body platform through the second resistor unit.

[0095] In one embodiment, in response to the voltage at a detection point in the liquid cooling connection confirmation circuit reaching a first vehicle-side preset value, the on-board charging connection device determines that the liquid cooling socket and the liquid cooling plug are successfully connected. This includes: in response to the voltage at a detection point between a first resistor unit and a first liquid cooling connection confirmation socket reaching a first vehicle-side preset value, and in response to the voltage at a detection point between a second resistor unit and a second liquid cooling connection confirmation socket reaching a second vehicle-side preset value, the on-board charging connection device determines that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0096] like Figure 5 The diagram shown is a schematic of another heat dissipation system provided in an embodiment of this application. The second resistor unit includes resistor R4, and the second liquid-cooled connection confirmation socket is a socket corresponding to port CC1. The detection point between the second resistor unit and the second liquid-cooled connection confirmation socket is detection point 3.

[0097] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at detection point 3 should be 0V because it is connected to the vehicle's electric platform. Only when the liquid-cooled socket is connected to the liquid-cooled plug will the voltage source U1 in the charging pile form a circuit through resistor R1 and resistor R4 in the electric vehicle. Due to the voltage division function of the resistors, the voltage at detection point 3 will reach the second vehicle-side preset value.

[0098] For example, if the voltage output of voltage source U1 is set to 12V, and the resistance values ​​of R1 and R4 are equal, then the preset value at the second vehicle end is 6V. Under this design, if the voltage at detection point 3 is 6V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0099] For example, the voltage output of voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 being 2Ω and R4 being 4Ω, then the preset value at the second vehicle end is 8V. Under this design, if the voltage at detection point 3 is 8V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0100] Therefore, based on the above analysis, when the voltage at detection point 2 is the output voltage of voltage source U2 and the voltage at detection point 3 is 0V, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 2 reaches the first vehicle-side preset value and the voltage at detection point 3 reaches the second vehicle-side preset value, the on-board charging connection device can identify that the liquid-cooled socket and liquid-cooled plug are successfully connected.

[0101] like Figure 6 The diagram shown is a schematic of another heat dissipation system provided in an embodiment of this application. The first resistor unit includes R5 and switch SV. The first liquid cooling connection confirmation socket is still the socket corresponding to the CC2 port. The detection point between the first resistor unit and the first liquid cooling connection confirmation socket is detection point 2. The second resistor unit includes R4, R4', R4" and switches S2, S2'. The second liquid cooling connection confirmation socket is the socket corresponding to the CC1 port. The detection point between the second resistor unit and the second liquid cooling connection confirmation socket is detection point 3. The specific identification process is the same as... Figure 5 Similarly, for the sake of brevity, I will not go into details.

[0102] In this embodiment, by identifying the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltage of two detection points, the accuracy of the on-board charging connection device in identifying the connection status of the liquid-cooled socket and the liquid-cooled plug can be further improved. 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 electric vehicles.

[0103] In some embodiments, the vehicle charging connection device can determine the connection status of the liquid-cooled socket and the liquid-cooled plug based solely on the voltage at detection point 3. The specific determination process has been described in the above embodiments and will not be repeated here.

[0104] Based on this, the above text introduced different embodiments of the vehicle charging connection device for determining the connection status of the liquid-cooled socket and the liquid-cooled plug from the perspective of the vehicle charging connection device. The following text will explain from the perspective of the liquid cooling equipment.

[0105] This application provides a liquid cooling device, which includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit, and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of an electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system.

[0106] One end of the liquid-cooled connection confirmation plug is used to connect to the liquid-cooled connection confirmation socket of the electric vehicle, and the other end of the liquid-cooled connection confirmation plug is connected to the liquid-cooled connection confirmation circuit.

[0107] Liquid cooling equipment is used to determine the connection status of the liquid cooling plug and the liquid cooling socket through a liquid cooling connection confirmation circuit.

[0108] In this embodiment, the liquid cooling device can be integrated with the charging device, or the liquid cooling device can be designed separately from the charging device; there is no limitation.

[0109] The liquid cooling device in this embodiment includes a liquid cooling gun plug, which includes a liquid cooling plug and a liquid cooling connection confirmation plug. When the liquid cooling plug is successfully connected to the liquid cooling socket of the electric vehicle, the cooling medium in the liquid cooling device can enter the electric vehicle through the liquid cooling plug to cool the power battery.

[0110] In existing technologies, the connection port of the under-vehicle cooling system is only a single inlet / outlet. When the charging pile is charging the electric vehicle's power battery, the electric vehicle and the under-vehicle cooling system cannot recognize whether they are connected, which affects the normal high-power charging of the power battery by the charging pile. In this embodiment, the liquid cooling plug includes not only the inlet / outlet but also a liquid cooling connection confirmation plug. Since the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit, the liquid cooling device can determine the connection status between the liquid cooling plug and the liquid cooling socket based on the liquid cooling connection confirmation circuit. When the liquid cooling socket and liquid cooling plug are successfully connected, when the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium into the power battery.

[0111] In one embodiment, when the liquid-cooled plug and the liquid-cooled socket are connected, the liquid-cooled connection confirmation circuit forms a current loop with the liquid-cooled connection confirmation circuit of the electric vehicle through the liquid-cooled connection confirmation plug and the liquid-cooled connection confirmation socket. The liquid-cooling device is used to detect the voltage at the detection point in the liquid-cooled connection confirmation circuit to determine the connection status of the liquid-cooled plug and the liquid-cooled socket.

[0112] When the voltage at the detection point reaches the preset value at the pile end, the liquid cooling equipment determines that the liquid cooling plug and liquid cooling socket are successfully connected.

[0113] In this embodiment, when the liquid-cooled plug and liquid-cooled socket are successfully connected, the connection confirmation circuit forms a current loop through the connection confirmation socket and the connection confirmation plug with the charging pile connection confirmation circuit. A detection point can be set in the current loop; when the voltage at the detection point reaches a preset value at the charging pile end, the liquid-cooling device determines that the liquid-cooled plug and liquid-cooled socket are successfully connected.

[0114] With this design, the liquid cooling equipment can determine the connection status of the liquid cooling socket and the liquid cooling plug based on the voltage at the detection point. When the liquid cooling socket and the liquid cooling plug are successfully connected, the liquid cooling equipment can cool the power battery by injecting a cooling medium into the power battery when the charging pile charges the power battery at high power. This can meet the heat dissipation requirements of the power battery when charging at high power, which is beneficial to improving the charging power of the power battery and reducing the charging time of electric vehicles.

[0115] The preset value at the pile end in this embodiment is related to the specific circuit configuration of the connection confirmation circuit and the location of the detection point. Please refer to the following section for details. Figures 4-6 The content.

[0116] The following section will describe, with reference to the accompanying diagrams, the specific circuit configuration of the liquid cooling connection confirmation circuit and the strategy for liquid cooling equipment to determine the connection status of the liquid cooling socket and the liquid cooling plug.

[0117] In one embodiment, the liquid-cooled connection confirmation plug includes a first liquid-cooled connection confirmation plug and a second liquid-cooled connection confirmation plug, and the liquid-cooled connection confirmation circuit includes a third resistor unit, wherein the second liquid-cooled connection confirmation plug is connected to a voltage source through the third resistor unit.

[0118] In one embodiment, the liquid cooling device is used to determine the connection status of the liquid cooling plug and the liquid cooling socket based on the voltage at a detection point between the third resistor unit and the second liquid cooling connection confirmation plug.

[0119] When the voltage at the detection point between the third resistor unit and the second liquid-cooled connection confirmation plug reaches the preset value at the terminal, the liquid-cooling device determines that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0120] Refer to the above Figure 4In this embodiment, the third resistor unit is R1, and the voltage source remains U1. The detection between the third resistor unit and the second liquid-cooled connection confirmation plug is detection point 1. Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to the voltage source U1, the voltage at detection point 1 should be the voltage output by the voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current of the voltage source U1 form 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 is located between resistor R1 and resistor R4, the voltage at detection point 1 will reach the preset value at the terminal due to the voltage division function of the resistors.

[0121] For example, if the voltage output of voltage source U1 is set to 12V, and the resistance values ​​of R1 and R4 are equal, then the preset value at the terminal is 6V. Under this design, if the voltage at detection point 1 is 6V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are in a connected state.

[0122] For example, the voltage output of voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 being 2Ω and R4 being 4Ω, then the preset value of the terminal is 8V. Under this design, if the voltage at detection point 1 is 8V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are in a connected state.

[0123] Based on the above analysis, when the voltage at detection point 1 is the output voltage of voltage source U1, the liquid cooling device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 1 is the preset value at the terminal, the liquid cooling device can identify that the liquid cooling socket and liquid cooling plug are successfully connected.

[0124] Figure 5 The third resistor unit shown and Figure 4 Similar to that, the specific identification process is the same as Figure 4 Similar examples will not be repeated here.

[0125] Continue to refer to Figure 6 In this embodiment, the fourth resistor unit includes R1, R1', switch S1, and switch S0. The voltage source remains U1, and the detection point between the third resistor unit and the second connection confirmation plug remains detection point 1. The specific identification process is the same as... Figure 4 Similar to that, for the sake of brevity, I will not go into details.

[0126] In this embodiment, since the detection point is connected to the voltage source in the liquid cooling device, when the voltage at the detection point is the voltage output by the voltage source, the liquid cooling device identifies that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at the detection point reaches the preset value at the terminal, the liquid cooling device identifies that the liquid cooling socket and the liquid cooling plug are successfully connected. By identifying the connection status of the liquid cooling socket and the liquid cooling plug based on the voltage at the detection point, the accuracy of the liquid cooling device in identifying the connection status of the liquid cooling socket and the liquid cooling plug can be improved. When the charging device charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0127] In one embodiment, the liquid-cooled connection confirmation circuit further includes a normally closed switch located between the third resistor unit and the second liquid-cooled connection confirmation plug.

[0128] The liquid cooling device is used to determine the connection status of the liquid cooling plug and the liquid cooling socket based on the voltage at the detection point between the third resistor unit and the second liquid cooling connection confirmation plug. This includes: in response to the voltage at the detection point between the third resistor unit and the normally closed switch reaching the preset value at the terminal, and the voltage at the detection point between the normally closed switch and the second liquid cooling connection confirmation plug reaching the preset value at the terminal, the liquid cooling device is used to determine that the liquid cooling plug and the liquid cooling socket are successfully connected.

[0129] Refer to the above Figure 5 In this embodiment, the third resistor unit is R1, the normally closed switch is S, and the voltage source is still U1. The detection between the third resistor unit and the normally closed switch is detection point 1, and the detection point between the normally closed switch and the second liquid cooling connection confirmation plug is detection point 4.

[0130] Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to voltage source U1 and switch S is normally closed, the voltages at detection points 1 and 4 should both be the output voltage of voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current from voltage source U1 form a circuit through resistor R1 in the DC device, resistor R4 in the electric vehicle, and the grounding wire in the electric vehicle. Because detection point 1 is located between resistors R1 and R4, the voltages at detection points 1 and 4 will reach the preset value at the terminal due to the voltage division function of the resistors. Another possible scenario is that the liquid-cooled socket is connected to the liquid-cooled plug, but switch S is in the open state. In this case, detection point 1 is connected to voltage source U1, and detection point 4 is connected to the grounding wire in the electric vehicle, resulting in the voltage at detection point 1 being the output voltage of voltage source U1, and the voltage at detection point 4 being 0V.

[0131] For example, if the voltage output of voltage source U1 is set to 12V, and the resistances of R1 and R4 are equal, then the preset value at the terminal is 6V. Under this design, if the voltage at detection point 1 is 6V, the liquid cooling device recognizes a successful connection between the liquid cooling socket and the liquid cooling plug. If the voltage at detection point 1 is 12V, and the voltage at detection point 4 is 0V, it indicates that the liquid cooling socket and the liquid cooling plug are connected, but switch S is open.

[0132] For example, if the voltage output of voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different (e.g., R1 is 2Ω and R4 is 4Ω), then the preset value at the terminals is 8V. In this design, if the voltage at detection point 1 is 8V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected. If the voltage at detection point 1 is 12V and the voltage at detection point 4 is 0V, it indicates that the liquid cooling socket and liquid cooling plug are connected, but switch S is open.

[0133] Based on the above analysis, when the voltage at detection points 1 and 4 is the output voltage of voltage source U1, the liquid cooling device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection points 1 and 4 is the preset value at the terminal, the liquid cooling device can identify that the liquid cooling socket and liquid cooling plug are successfully connected. When the voltage at detection point 1 is the output voltage of voltage source U1 and the voltage at detection point 4 is 0V, the liquid cooling device identifies that the liquid cooling socket and liquid cooling plug are connected, but switch S is in the open state.

[0134] In this embodiment, by identifying the connection status of the liquid-cooled socket and the liquid-cooled plug based on the voltage of two detection points, the accuracy of the liquid-cooling device in identifying the connection status of the liquid-cooled socket and the liquid-cooled plug can be further improved. When the charging device charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium into the power battery, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0135] The above text introduced how to determine the connection status of liquid-cooled plugs and liquid-cooled sockets through on-board charging connection devices and liquid cooling equipment. In addition to determining the connection status of liquid-cooled sockets and liquid-cooled plugs, on-board charging connection devices can also determine the connection status of DC sockets and DC plugs.

[0136] In one embodiment, the on-board charging connection device further includes a charging connection confirmation circuit and a second vehicle socket. The second vehicle socket includes a DC socket and a charging connection confirmation socket. One end of the DC socket is used to connect to the DC plug of the charging gun, and the other end of the DC socket is connected to the power battery. One end of the charging connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the charging connection confirmation socket is connected to the charging connection confirmation circuit.

[0137] The vehicle charging connection device is used to determine the connection status of the DC socket and DC plug through a charging connection confirmation circuit.

[0138] For determining the connection status of DC sockets and DC plugs, please refer to relevant standards. The following will combine... Figure 7 Here's a brief introduction to vehicle-mounted charging connection devices and how to determine the connection status of DC plugs and DC sockets in charging piles.

[0139] refer to Figure 7 The on-board charging connection device can determine the connection status of the DC plug and DC socket by detecting the voltage at point 2. The charging pile can determine the connection status of the DC plug and DC socket by detecting the voltage at point 1.

[0140] Before the DC socket is connected to the DC plug, since detection point 2 is connected to voltage source U2 and detection point 1 is connected to voltage source U1, the voltage at detection point 2 should be the output voltage of voltage source U2, and the voltage at detection point 1 should be the output voltage of voltage source U1. Only when the DC socket is connected to the DC plug will voltage source U2 form a circuit through resistor R5 in the electric vehicle, resistor R3 in the charging pile, and the grounding wire in the charging pile, and voltage source U1 form a circuit through R1, R4, and the grounding wire in the electric vehicle. Due to the voltage division function of the resistors, the voltage at detection point 2 will be a preset value between 0 and U2, and the voltage at detection point 1 will be a preset value between 0 and U1.

[0141] For example, if voltage sources U1 and U2 output 12V, and the resistances of R1 and R4 are equal, and the resistances of R3 and R5 are equal, then under this design, if the voltage at detection point 2 is 6V, the on-board charging connection device will recognize that the DC socket and DC plug are successfully connected. If the voltage at detection point 1 is 6V, then the charging pile will recognize that the DC socket and DC plug are successfully connected.

[0142] It should be understood that the values ​​shown in the above embodiments are for illustrative purposes only, and the specific voltage source and resistor values ​​can be referenced from relevant standards.

[0143] In one embodiment, the second vehicle socket further includes an auxiliary power socket, one end of which is used to connect to the auxiliary power plug of the charging gun, and the other end of which is used to receive DC power. The second vehicle socket also includes a second communication socket, one end of which is used to connect to the communication plug of the charging gun, and the other end of which is connected to a controller.

[0144] In this embodiment of the application, the auxiliary power socket in the second vehicle socket can be the one described above. Figure 7 The sockets corresponding to A+ and A- are shown above. The second communication socket is as described above. Figure 7The S+ and S- sockets in the diagram allow the charging station and electric vehicle to transmit messages via a second communication socket and a second communication plug. For a detailed description, please refer to the relevant sections on A+, A-, S+, and S- in the charging standard; further details will not be provided here.

[0145] In one embodiment, the on-board charging connection device is used to: send a message to the charging pile requesting the charging pile to output a first charging power when the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected; or, when the DC socket and the DC plug are successfully connected, send a message to the charging pile requesting the charging pile to output a second charging power, wherein the second charging power is less than the first charging power.

[0146] In this embodiment, when the liquid-cooled socket and liquid-cooled plug are successfully connected, and the DC socket and DC plug are successfully connected, it indicates that the electric vehicle meets the conditions for supercharging. That is, when the power battery is charged at high power, the under-vehicle liquid-cooling device can transfer cooling medium to the power battery's thermal management system through the liquid-cooled plug and liquid-cooled socket. Therefore, the on-board charging connection device can send a message to the charging pile requesting the charging pile to output a first charging power, which can be a power greater than a certain threshold. Thus, when the charging pile charges the power battery at the first charging power, the liquid-cooling device cools the power battery by injecting cooling medium, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which helps to improve the charging power of the power battery and reduce the charging time of the electric vehicle.

[0147] If the DC socket and DC plug are successfully connected, it indicates that the electric vehicle does not meet the requirements for supercharging. This means that if the battery is charged at high power, the under-vehicle liquid cooling system cannot supply cooling medium to the battery. Therefore, the on-board charging connection device can send a message to the charging station requesting a second charging power, which can be less than a certain threshold. Thus, when the charging station charges the battery at this second charging power, since it is less than the threshold, the vehicle's thermal management system can cool the battery without requiring the under-vehicle liquid cooling system.

[0148] Based on this, the above section introduced the connection confirmation circuit and how to determine the connection status of the DC socket and DC plug based on the connection confirmation circuit, as well as the connection status of the liquid cooling socket and liquid cooling plug. The following section will explain the sequence of contact coupling between the plug and socket of the liquid cooling gun during the connection process.

[0149] In one embodiment, the first vehicle socket includes a plug-in end for plugging and unplugging with a charging gun, and the distance from the liquid-cooled connection confirmation socket to the plug-in end is greater than or equal to the distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end. The liquid-cooled plug includes a plug-in end for plugging and unplugging with the vehicle socket, and the distance from the liquid-cooled connection confirmation plug to the plug-in end is greater than the distance from the liquid inlet / outlet of the liquid-cooled plug to the plug-in end.

[0150] In this embodiment, the distance from the liquid-cooled connection confirmation socket to the plug-in end is greater than or equal to the distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end. Since the distance from the liquid-cooled connection confirmation socket to the plug-in end is greater than the distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end, in this case, it is equivalent to the contacts of the liquid inlet / outlet of the liquid-cooled socket coupling first to the contacts of the liquid inlet / outlet of the liquid-cooled plug, and the contacts of the liquid-cooled connection confirmation socket coupling later to the contacts of the liquid-cooled connection confirmation plug. In other words, the coupling of the contacts of the liquid-cooled connection confirmation socket to the contacts of the liquid-cooled connection confirmation plug is later than the coupling of the contacts of the liquid inlet / outlet of the liquid-cooled socket to the contacts of the liquid inlet / outlet of the liquid-cooled plug.

[0151] like Figure 8 The diagram shown is a schematic of a liquid injection interface provided in an embodiment of this application. The plug-in / plug-out end is the dashed line between the liquid cooling plug and the liquid cooling socket shown in the diagram. PE is the grounding port, CC1 and CC2 are ports indicating confirmed liquid cooling connection, S+ and S- are communication ports, and I and O are the liquid inlet and liquid outlet, respectively.

[0152] In this embodiment, the distance from the liquid-cooled connection confirmation plug to the plug-in end includes two distances, d1 and d2, and the distance from the liquid inlet / outlet of the liquid-cooled plug to the plug-in end is d0, where d1>d0 and d2>d0. The distance from the liquid-cooled connection confirmation socket to the plug-in end includes two distances, d1' and d2', and the distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end is d0', where d1'>d0' and d2'>d0'. Based on this design, during the connection process between the liquid-cooled socket and the liquid-cooled plug, the liquid inlet / outlet of the liquid-cooled socket is connected to the liquid inlet / outlet of the liquid-cooled plug first, and then the liquid-cooled connection confirmation socket is connected to the liquid-cooled connection confirmation plug (i.e., CC1 and CC2). This facilitates the cooling of the power battery by the liquid-cooling equipment under the vehicle when the charging pile charges the electric vehicle at high power. This is because if the liquid cooling connection confirmation socket and the liquid cooling connection confirmation plug are connected first, and then the liquid inlet / outlet of the liquid cooling socket is connected to the liquid inlet / outlet of the liquid cooling plug, it is possible that ports CC1 and CC2 are conductive, but the liquid inlet / outlet of the liquid cooling socket is not conductive to the liquid inlet / outlet of the liquid cooling plug. This could lead to incorrect connection confirmation and potential leakage. Therefore, in this application, the distance from the liquid cooling connection confirmation socket to the plug-in end is designed to be greater than or equal to the distance from the liquid inlet / outlet of the liquid cooling socket to the plug-in end, and the distance from the liquid cooling connection confirmation plug to the plug-in end is greater than the distance from the liquid inlet / outlet of the liquid cooling plug to the plug-in end, thus preventing leakage.

[0153] In one embodiment, the distance from the first liquid-cooled connection confirmation socket to the plug-in end is greater than or equal to the distance from the second liquid-cooled connection confirmation socket to the plug-in end. The distance from the first liquid-cooled connection confirmation plug to the plug-in end is greater than or equal to the distance from the second liquid-cooled connection confirmation plug to the plug-in end.

[0154] In this embodiment, the electric vehicle determines the connection status of the liquid cooling socket and the liquid cooling plug based on the first liquid cooling connection confirmation socket and the first liquid cooling connection confirmation plug. The liquid cooling device determines the connection status of the liquid cooling socket and the liquid cooling plug based on the second liquid cooling connection confirmation socket and the second liquid cooling connection confirmation plug.

[0155] In this embodiment, the distance from the first liquid-cooled connection confirmation socket to the plug-in end is greater than or equal to the distance from the second liquid-cooled connection confirmation socket to the plug-in end, and the distance from the first liquid-cooled connection confirmation plug to the plug-in end is greater than or equal to the distance from the second liquid-cooled connection confirmation plug to the plug-in end. This is equivalent to the electric vehicle performing the final complete connection confirmation, or the electric vehicle and the liquid-cooling device jointly performing the final complete connection confirmation.

[0156] The following example uses an electric vehicle undergoing final full connectivity confirmation. (Reference) Figure 8The distance from the first liquid-cooled connection confirmation plug to the plug-in end is d2, and the distance from the first liquid-cooled connection confirmation socket to the plug-in end is d2'. The distance from the second liquid-cooled connection confirmation plug to the plug-in end is d1, and the distance from the second connection confirmation socket to the plug-in end is d1', where d2>d1 and d2'>d1'. Based on this design, during the connection process between the liquid-cooled socket and the liquid-cooled plug, the contacts of the second connection confirmation socket and the second connection confirmation plug (i.e., CC1) connect first, and the contacts of the first connection confirmation socket and the first connection confirmation plug (i.e., CC2) connect later. This is equivalent to the electric vehicle performing the final complete connection confirmation, which is beneficial for the on-board charging connection device of the electric vehicle to judge the connection status of the liquid-cooled socket and the liquid-cooled plug, and further improves the confirmation efficiency. This is because the on-board charging connection device needs to send a message requesting charging power to the charging pile. The charging power is determined by the on-board charging connection device. When the liquid-cooled socket and liquid-cooled plug are connected, the on-board charging connection device can send a message requesting a higher power to the charging pile. When the liquid-cooled socket and liquid-cooled plug are not connected, the on-board charging connection device can send a message requesting a lower power to the charging pile. If the liquid-cooling device performs the final complete connection confirmation, it also needs to send a message to the electric vehicle indicating that the liquid-cooled socket and liquid-cooled plug are successfully connected. In this case, the liquid-cooling device needs to wait until the communication socket and communication plug are successfully connected before sending the message, increasing latency and reducing efficiency. Therefore, in this embodiment, the design allows the electric vehicle to perform the final complete connection confirmation, which improves the efficiency of determining the connection status of the liquid-cooled socket and liquid-cooled plug.

[0157] It should be noted that in this embodiment, d2 = d1, d2' = d1' can also be designed. Based on this design, during the connection process between the liquid-cooled socket and the liquid-cooled plug, the first connection confirmation socket and the first connection confirmation plug (i.e., CC2) and the second connection confirmation socket and the second connection confirmation plug (i.e., CC1) are connected simultaneously, which is equivalent to the liquid-cooling device and the electric vehicle jointly performing the final complete connection confirmation. This design can also improve the efficiency of judging the connection status of the liquid-cooled socket and the liquid-cooled plug.

[0158] In one embodiment, the electric vehicle includes a traction device for moving the liquid cooler gun so that the first vehicle socket and the liquid cooler gun are fully connected.

[0159] The liquid-cooled connection confirmation socket also includes a third liquid-cooled connection confirmation socket. The distance from the second liquid-cooled connection confirmation socket to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation socket to the plug-in end. The distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end is less than the distance from the third liquid-cooled connection confirmation socket to the plug-in end. The distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end is greater than or equal to the distance from the first liquid-cooled connection confirmation socket to the plug-in end.

[0160] The liquid cooling connection confirmation plug also includes a third liquid cooling connection confirmation plug. The distance from the second liquid cooling connection confirmation plug to the plug-in end is equal to the distance from the third liquid cooling connection confirmation plug to the plug-in end. The distance from the liquid inlet / outlet of the liquid cooling plug to the plug-in end is less than the distance from the third liquid cooling connection confirmation plug to the plug-in end. The distance from the liquid inlet / outlet of the liquid cooling plug to the plug-in end is greater than or equal to the distance from the first liquid cooling connection confirmation plug to the plug-in end.

[0161] In this embodiment, the traction device in the electric vehicle is used to move the liquid cooling gun so that the first vehicle socket and the liquid cooling gun are fully connected. In this case, when the user inserts the liquid cooling gun into the first vehicle socket, the liquid cooling gun and the first vehicle socket are initially in a partially connected state, and then the traction device moves the liquid cooling gun to bring them into a fully connected state. Because the liquid cooling gun and the first vehicle socket are fully connected by the traction device during this process, the user does not need to manually push the liquid cooling gun, which improves the user experience.

[0162] refer to Figure 9 Compared with the above, the embodiments of this application are different. Figure 8 The embodiment shown adds a third liquid cooling connection confirmation socket and a third liquid cooling connection confirmation plug, which correspond to... Figure 9 The CC3 port in the system.

[0163] The distance from the first liquid-cooling connection confirmation plug to the insertion and extraction end is d2, and the distance from the first liquid-cooling connection confirmation socket to the insertion and extraction end is d2'. The distance from the second liquid-cooling connection confirmation plug to the insertion and extraction end is d1, the distance from the second liquid-cooling connection confirmation socket to the insertion and extraction end is d1', the distance from the third liquid-cooling connection confirmation plug to the insertion and extraction end is d3, and the distance from the third liquid-cooling connection confirmation socket to the insertion and extraction end is d3'. And d2 ≤ d0 < d1 = d3, d2' ≤ d0' < d1' = d3'. Based on this design, during the connection process of the liquid-cooling socket and the liquid-cooling plug, the contact of the first connection confirmation socket and the contact of the first connection confirmation plug (i.e., CC2) are connected first, then the liquid inlet and outlet of the liquid-cooling socket and the liquid inlet and outlet of the liquid-cooling plug are connected, and then the contact of the second connection confirmation socket and the contact of the second connection confirmation plug (i.e., CC1), and the contact of the third connection confirmation socket and the contact of the third connection confirmation plug (i.e., CC3) are connected finally. Among them, the connection of the first liquid-cooling connection confirmation socket and the first liquid-cooling connection confirmation plug can indicate that the liquid-cooling gun and the vehicle socket are in a semi-connected state, and the connection of the second liquid-cooling connection confirmation socket and the second liquid-cooling connection confirmation plug, and the connection of the third liquid-cooling connection confirmation socket and the third liquid-cooling connection confirmation plug can indicate that the liquid-cooling gun and the vehicle socket are in a fully connected state. Since d1 = d3 and d1' = d3', it is equivalent to jointly performing the final full connection confirmation by the electric vehicle and the liquid-cooling device, that is, the electric vehicle and the liquid-cooling device have the same timing for judging the connection state of the liquid-cooling socket and the liquid-cooling plug, which can ensure the timely transmission of the liquid-cooling medium to the thermal management system of the power battery and can also avoid misjudgment of the liquid-cooling device.

[0164] In the embodiment of the present application, when the contact of the first liquid-cooling connection confirmation socket and the contact of the first liquid-cooling connection confirmation plug are connected, it indicates that the liquid-cooling socket and the liquid-cooling plug are in a semi-connected state. The traction device can traction the liquid-cooling gun to move so that the liquid-cooling gun approaches the first vehicle socket, and finally makes the liquid-cooling gun and the first vehicle socket in a fully connected state, without the user manually pushing the liquid-cooling gun, which can improve the user experience. If it is designed that d0 < d2, that is, the contacts of the liquid inlet and outlet of the liquid-cooling socket and the contacts of the liquid inlet and outlet of the liquid-cooling plug are connected first, and the contact of the first liquid-cooling connection confirmation socket and the contact of the first liquid-cooling connection confirmation plug are connected later. The disadvantage of this design is that the user needs to first connect the contacts of the liquid inlet and outlet of the liquid-cooling socket and the contacts of the liquid inlet and outlet of the liquid-cooling plug. However, it is difficult for the user alone to successfully connect the contacts of the liquid inlet and outlet of the liquid-cooling socket and the contacts of the liquid inlet and outlet of the liquid-cooling plug, which reduces the user experience.

[0165] In addition, in the embodiments of the present application, it is designed that the distance from the second liquid-cooled connection confirmation socket to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation socket to the plug-in end, and the distance from the second liquid-cooled connection confirmation plug to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation plug to the plug-in end, that is, d1 = d3 and d1' = d3'. This is because if it is designed that d1 > d3 and d1' > d3', it means that the third liquid-cooled connection confirmation socket and the third liquid-cooled connection confirmation plug are connected first, and the second liquid-cooled connection confirmation socket and the second liquid-cooled connection confirmation plug are connected later. There may be a situation where the third liquid-cooled connection confirmation socket and the third liquid-cooled connection confirmation plug are successfully connected, but the second liquid-cooled connection confirmation socket and the second liquid-cooled connection confirmation plug are never connected. Based on this situation, the liquid-cooled device determines that the liquid-cooled socket and the liquid-cooled plug are not connected, and the liquid-cooled device will not transmit the cooling medium to the thermal management system of the power battery, thus unable to solve the heat dissipation problem during the charging of the power battery and affecting the high-power charging of the power battery.

[0166] If it is designed that d1 < d3 and d1' < d3', it means that the second liquid-cooled connection confirmation socket and the second liquid-cooled connection confirmation plug are connected first, and the third liquid-cooled connection confirmation socket and the third liquid-cooled connection confirmation plug are connected later. There may be a situation where the second liquid-cooled connection confirmation socket and the second liquid-cooled connection confirmation plug are successfully connected, but the third liquid-cooled connection confirmation socket and the third liquid-cooled connection confirmation plug are never connected. Based on this situation, the liquid-cooled device determines that the liquid-cooled socket and the liquid-cooled plug are connected, but in fact, the electric vehicle determines that the liquid-cooled socket and the liquid-cooled plug are not connected, resulting in misjudgment by the liquid-cooled device.

[0167] Of course, in some possible embodiments, the second connection confirmation port, that is, the CC1 port, may not be provided in the liquid-cooled gun. When the electric vehicle determines that the liquid-cooled socket and the liquid-cooled plug are successfully connected, the electric vehicle sends a message to the liquid-cooled device to indicate the successful connection of the liquid-cooled socket and the liquid-cooled plug.

[0168] As mentioned above, in the case where the electric vehicle includes a traction device, the contacts of the first connection confirmation socket and the contacts of the first connection confirmation plug (i.e., CC2) are connected first, and it can be considered that the liquid-cooled gun and the electric vehicle are in a semi-connected state. The specific circuit design form can be referred to Figure 10 .

[0169] Refer to Figure 10The first connection confirmation socket is connected to voltage source U2 via resistor R5, and also via resistor R7. The on-board charging connection device can determine whether the liquid cooling gun and the electric vehicle are in a semi-connected state based on detection point 5 between the first connection confirmation socket and R7. When the user inserts the liquid cooling gun into the vehicle socket, before the liquid cooling gun and the electric vehicle are in a semi-connected state, the voltage at detection point 5 should be the voltage output by voltage source U2, since detection point 5 is connected to voltage source U2. Only when the liquid cooling gun and the electric vehicle are in a semi-connected state does the current from voltage source U2 form a loop through resistor R7 in the electric vehicle, resistor R6 in the liquid cooling device, and the grounding wire in the liquid cooling device. Because detection point 5 is located between resistors R7 and R6, the voltage at detection point 5 will reach the preset value due to the voltage division function of the resistors.

[0170] 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 third preset value is 6V. Under this design, if the voltage at detection point 5 is 6V, it indicates that the liquid cooling socket and liquid cooling plug are in a semi-connected state.

[0171] Based on the above analysis, when the voltage at detection point 5 is the output voltage of voltage source U2, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 5 is the third preset value, it indicates that the liquid cooling socket and liquid cooling plug are in a semi-connected state.

[0172] In one embodiment, in response to a successful connection between the liquid-cooled socket and the liquid-cooled plug, the on-board charging connection device sends a message indicating a successful connection between the liquid-cooled socket and the liquid-cooled plug. Correspondingly, the liquid-cooling device receives the message indicating a successful connection between the liquid-cooled socket and the liquid-cooled plug.

[0173] In this embodiment, when the on-board charging connection device determines that the liquid-cooled socket and the liquid-cooled plug are successfully connected, the on-board charging connection device can send a message to the liquid-cooling device. This message indicates that the liquid-cooled socket and the liquid-cooled plug are successfully connected. After receiving this message, the liquid-cooling device does not need to determine the connection status of the liquid-cooled plug and the liquid-cooled socket based on the voltage of the detection point in the connection confirmation circuit, thus improving the efficiency of the determination.

[0174] In addition, this application also provides an electric vehicle, which includes an on-board charging connection device, a power battery, and a thermal management system. The thermal management system is used to dissipate heat from the power battery.

[0175] The on-board charging connection device includes a first vehicle socket and a liquid-cooled connection confirmation circuit. The first vehicle socket includes a liquid-cooled socket and a liquid-cooled connection confirmation socket. One end of the liquid-cooled socket is used to connect to the liquid-cooled plug of the liquid-cooling gun, and the other end of the liquid-cooled socket is connected to the thermal management system through a liquid-cooling pipeline. The liquid-cooled socket is used to receive coolant output from the liquid-cooling plug, or to output coolant to the liquid-cooling plug. One end of the liquid-cooled connection confirmation socket is used to connect to the liquid-cooled connection confirmation plug of the liquid-cooling gun, and the other end of the liquid-cooled connection confirmation socket is connected to the liquid-cooled connection confirmation circuit.

[0176] Electric vehicles use a liquid-cooled connection confirmation circuit to determine the connection status of the liquid-cooled socket and the liquid-cooled plug. For details on how the on-board charging connection device in electric vehicles determines the connection status of the liquid-cooled socket and the liquid-cooled plug using the liquid-cooled connection confirmation circuit, and how it determines the connection status of the DC socket and the DC plug using the charging connection confirmation circuit, please refer to the relevant content above; further details will not be repeated here.

[0177] This application also provides a charging pile, which includes a liquid cooling device, a power module, and a charging gun. The charging gun is connected to the power module and is used to charge electric vehicles.

[0178] The liquid cooling device includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit, and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system. One end of the liquid cooling connection confirmation plug is used to connect to the liquid cooling connection confirmation socket of the electric vehicle, and the other end of the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit.

[0179] The charging station uses a liquid-cooled connection confirmation circuit to determine the connection status between the liquid-cooled plug and the liquid-cooled socket.

[0180] For details on how the charging station determines the connection status of the liquid-cooled plug and the liquid-cooled socket based on the liquid-cooled connection confirmation circuit, please refer to the relevant content on the specific identification of liquid-cooled equipment mentioned above, which will not be repeated here.

[0181] As mentioned above, the liquid cooling device determines the connection status of the liquid cooling socket and liquid cooling plug based on the voltage of the detection point in the connection confirmation circuit. In some embodiments, the liquid cooling device can also identify the connection status of the liquid cooling socket and liquid cooling plug based on other methods, as detailed below.

[0182] This application provides an on-board charging connection device for electric vehicles. The on-board charging connection device includes a first vehicle socket and a liquid cooling connection confirmation circuit. The first vehicle socket includes a liquid cooling socket and a liquid cooling connection confirmation socket. The first vehicle socket is used to connect the liquid cooling gun of the liquid cooling device.

[0183] One end of the liquid cooling socket is used to connect to the liquid cooling plug of the liquid cooling gun, and the other end of the liquid cooling socket is connected to the thermal management system of the power battery through the liquid cooling pipeline. The liquid cooling socket is used to receive the coolant output from the liquid cooling plug, or the liquid cooling socket is used to output coolant to the liquid cooling plug.

[0184] One end of the liquid cooling connection confirmation socket is used to connect the liquid cooling connection confirmation plug of the liquid cooling gun, and the other end of the liquid cooling connection confirmation socket is connected to the liquid cooling connection confirmation circuit.

[0185] The on-board charging connection device is used to: determine the connection status of the liquid-cooled socket and the liquid-cooled plug through the liquid-cooled connection confirmation circuit; and in response to the successful connection of the liquid-cooled socket and the liquid-cooled plug, send a message to the liquid-cooling device to indicate that the connection of the liquid-cooled socket and the liquid-cooled plug is successful.

[0186] Accordingly, for liquid cooling equipment, the liquid cooling equipment includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of the electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system through a pipeline.

[0187] One end of the liquid-cooled connection confirmation plug is used to connect to the liquid-cooled connection confirmation socket of the electric vehicle, and the other end of the liquid-cooled connection confirmation plug is connected to the liquid-cooled connection confirmation circuit.

[0188] The liquid cooling device is used to receive a message from the electric vehicle indicating that the liquid cooling socket and liquid cooling plug are successfully connected; in response to the successful connection of the liquid cooling socket and liquid cooling plug, the liquid cooling system is used to output coolant to the electric vehicle through the liquid cooling plug.

[0189] In this embodiment, the liquid-cooled socket includes not only liquid inlet and outlet ports but also a liquid-cooled connection confirmation socket. Since the liquid-cooled connection confirmation socket is connected to a liquid-cooled 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 liquid-cooled connection confirmation circuit. When the liquid-cooled socket and liquid-cooled plug are successfully connected, when the charging device charges the power battery at high power, it receives coolant from the liquid-cooling device through the liquid-cooled socket and transfers the coolant to the power battery's thermal management system to cool the power battery. This solves the heat dissipation problem during power battery charging and improves the charging power of the charging device. Furthermore, when the on-board charging connection device determines that the liquid-cooled socket and liquid-cooled plug are successfully connected, it can send a message to the liquid-cooling device indicating that the connection is successful. In this way, the liquid-cooling device itself does not need to determine the connection status of the liquid-cooled socket and liquid-cooled plug, saving time and improving efficiency.

[0190] In one embodiment, when the liquid-cooled socket and the liquid-cooled plug are connected, the liquid-cooled connection confirmation circuit connected to the liquid-cooled connection confirmation socket and the liquid-cooled connection confirmation circuit connected to the liquid-cooled connection confirmation plug form a current loop. The on-board charging connection device is used to detect the voltage at the detection point in the current loop to determine the connection status of the liquid-cooled socket and the liquid-cooled plug.

[0191] In response to the voltage at the detection point in the liquid cooling connection confirmation circuit reaching the preset value at the vehicle end, the on-board charging connection device is used to determine that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0192] In this embodiment, when the liquid-cooled socket and liquid-cooled plug are connected, the liquid-cooled connection confirmation circuit forms a current loop with the liquid-cooled connection confirmation circuit of the charging pile through the liquid-cooled connection confirmation socket and liquid-cooled connection confirmation plug. A detection point can be set in the current loop. When the voltage at the detection point in the current loop reaches a preset value at the vehicle end, the on-board charging connection device determines that the liquid-cooled socket and liquid-cooled plug are successfully connected.

[0193] The vehicle-side preset value in this embodiment is related to the specific circuit configuration of the liquid cooling connection confirmation circuit and the location of the detection point. Please refer to the following section for details. Figure 11 and Figure 12 The content.

[0194] In one embodiment, the vehicle socket further includes a grounding socket, one end of which is used to connect to the grounding plug of the liquid cooling gun, and the other end of which is connected to the vehicle body platform. The liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The liquid cooling connection confirmation circuit includes wires, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug via the wires. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket. The liquid cooling connection confirmation circuit includes a first resistor unit. The first liquid cooling connection confirmation socket is connected to a voltage source via the first resistor unit, and the second liquid cooling connection confirmation circuit is connected to the vehicle body platform.

[0195] In one embodiment, in response to the voltage at the detection point between the first resistor unit and the first liquid-cooled connection confirmation socket reaching a preset value at the vehicle end, the on-board charging connection device is used to determine that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0196] like Figure 11 The diagram shown is a schematic of a heat dissipation system provided in an embodiment of this application. The first resistor unit includes resistor R5, the first liquid cooling connection confirmation socket is a socket corresponding to port CC2, and the voltage source is U2. The detection point between the first resistor unit and the first liquid cooling connection confirmation socket is detection point 2.

[0197] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at detection point 2 should be the output voltage of voltage source U2, since detection point 2 is connected to voltage source U2. Only when the liquid-cooled socket is connected to the liquid-cooled plug, and voltage source U2 forms a circuit through resistor R5 in the electric vehicle, the cable in the liquid-cooling equipment, and the grounding wire in the electric vehicle, will the voltage at detection point 2 reach the preset value at the vehicle end. Since detection point 2 is connected to the grounding wire, the voltage at detection point 2 should be 0V.

[0198] Therefore, based on the above analysis, when the voltage at detection point 2 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 2 reaches the preset value at the vehicle end, the on-board charging connection device can identify that the liquid-cooled socket and liquid-cooled plug are successfully connected.

[0199] In one embodiment, the vehicle socket further includes a grounding socket, one end of which is used to connect to the grounding plug of the liquid cooling gun, and the other end of which is connected to the vehicle body platform. The liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug. The liquid cooling connection confirmation circuit includes wires, and the first liquid cooling connection confirmation plug is connected to the second liquid cooling connection confirmation plug through the wires.

[0200] The liquid-cooled connection confirmation socket includes a first liquid-cooled connection confirmation socket and a second liquid-cooled connection confirmation socket, and the liquid-cooled connection confirmation circuit includes a second resistor unit.

[0201] The first liquid cooling connection confirmation socket is connected to the voltage source, and the second liquid cooling connection confirmation socket is connected to the vehicle body ground platform through the second resistor unit.

[0202] In one embodiment, in response to the voltage at the detection point between the second resistor unit and the second liquid-cooled connection confirmation socket reaching a preset value at the vehicle end, the on-board charging connection device is used to determine that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0203] like Figure 12 The diagram shown is a schematic of a heat dissipation system provided in an embodiment of this application. The second resistor unit includes resistor R5', the second liquid-cooling connection confirmation socket is a socket corresponding to port CC1, and the voltage source is U2. The detection point between the second resistor unit and the second liquid-cooling connection confirmation socket is detection point 3.

[0204] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at test point 3 should be 0V because it is connected to the vehicle's ground platform. Only when the liquid-cooled socket is connected to the liquid-cooled plug will the voltage at test point 3 reach the preset value at the vehicle end, as the voltage source U2 forms a circuit through the cables in the liquid-cooling equipment, the resistor R5' in the electric vehicle, and the grounding wire in the electric vehicle. Furthermore, because test point 3 is connected to voltage source U2, the voltage at test point 3 should be the voltage output by voltage source U2.

[0205] Therefore, based on the above analysis, when the voltage at detection point 3 is 0V, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 3 reaches the preset value at the vehicle end, the on-board charging connection device can identify that the liquid-cooled socket and liquid-cooled plug are successfully connected.

[0206] In one embodiment, both the on-board charging connection device and the liquid cooling device include a wireless communication module; the on-board charging connection device is used to send messages to the charging pile via the wireless communication module. Correspondingly, the liquid cooling device also includes a wireless communication module; the liquid cooling device is used to receive and send messages via the wireless communication module.

[0207] The wireless communication module in this application embodiment may include Bluetooth, WiFi, or StarFlash, etc.

[0208] In one embodiment, the electric vehicle includes a traction device for moving the liquid cooler gun so that the first vehicle socket and the liquid cooler gun are fully connected.

[0209] The liquid-cooled connection confirmation socket also includes a third liquid-cooled connection confirmation socket. The distance from the second liquid-cooled connection confirmation socket to the plug-in end is equal to the distance from the third liquid-cooled connection confirmation socket to the plug-in end. The distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end is less than the distance from the third liquid-cooled connection confirmation socket to the plug-in end. The distance from the liquid inlet / outlet of the liquid-cooled socket to the plug-in end is greater than or equal to the distance from the first liquid-cooled connection confirmation socket to the plug-in end.

[0210] In one embodiment, the on-board charging connection device further includes a charging connection confirmation circuit and a second vehicle socket. The second vehicle socket includes a DC socket and a charging connection confirmation socket. One end of the DC socket is used to connect to the DC plug of the charging gun, and the other end of the DC socket is connected to the power battery. One end of the charging connection confirmation socket is used to connect to the connection confirmation plug of the charging gun, and the other end of the charging connection confirmation socket is connected to the charging connection confirmation circuit. The on-board charging connection device is used to determine the connection status of the DC socket and the DC plug through the charging connection confirmation circuit.

[0211] In one embodiment, the second vehicle socket further includes an auxiliary power socket, one end of which is used to connect to the auxiliary power plug of the charging gun, and the other end of which is used to receive DC power; the second vehicle socket further includes a second communication socket, one end of which is used to connect to the communication plug of the charging gun, and the other end of which is connected to the controller.

[0212] In one embodiment, the on-board charging connection device is used to: send a message to the charging pile requesting the charging pile to output a first charging power when the liquid-cooled socket and the liquid-cooled plug are successfully connected, and the DC socket and the DC plug are successfully connected; or, when the DC socket and the DC plug are successfully connected, send a message to the charging pile requesting the charging pile to output a second charging power, wherein the second charging power is less than the first charging power.

[0213] For details on this part, please refer to the relevant content in the above embodiments, which will not be repeated here.

[0214] The above embodiment uses a connection confirmation circuit to determine the connection status of the liquid-cooled socket and liquid-cooled plug. If the connection is successful, the electric vehicle sends a message to the liquid-cooling device to notify them of the successful connection. In another possible embodiment, this message can also be sent by the liquid-cooling device to the on-board charging connection device. The liquid-cooling device can determine the connection status of the liquid-cooled socket and liquid-cooled plug using the connection confirmation circuit, and if the connection is successful, send a message to the on-board charging pile device to notify them of the successful connection.

[0215] Furthermore, this application also provides an electric vehicle, which includes an on-board charging connection device, a power battery, and a thermal management system. The on-board charging connection device is applied to the electric vehicle and includes a first vehicle socket and a liquid-cooling connection confirmation circuit. The first vehicle socket includes a liquid-cooling socket and a liquid-cooling connection confirmation socket, and is used to connect the liquid-cooling gun of a liquid-cooling device. One end of the liquid-cooling socket is used to connect to the liquid-cooling plug of the liquid-cooling gun, and the other end of the liquid-cooling socket is connected to the thermal management system of the power battery through a liquid-cooling pipeline. The liquid-cooling socket is used to receive coolant output from the liquid-cooling plug, or to output coolant to the liquid-cooling plug. One end of the liquid-cooling connection confirmation socket is used to connect to the liquid-cooling connection confirmation plug of the liquid-cooling gun, and the other end of the liquid-cooling connection confirmation socket is connected to the liquid-cooling connection confirmation circuit. The electric vehicle is used to: determine the connection status of the liquid-cooling socket and the liquid-cooling plug through the liquid-cooling connection confirmation circuit; and in response to a successful connection between the liquid-cooling socket and the liquid-cooling plug, send a message to the liquid-cooling device indicating a successful connection between the liquid-cooling socket and the liquid-cooling plug.

[0216] Electric vehicles use a liquid-cooled connection confirmation circuit to determine the connection status of the liquid-cooled socket and the liquid-cooled plug. For details on how the on-board charging connection device in electric vehicles determines the connection status of the liquid-cooled socket and the liquid-cooled plug using the liquid-cooled connection confirmation circuit, and how it determines the connection status of the DC socket and the DC plug using the charging connection confirmation circuit, please refer to the relevant content above; further details will not be repeated here.

[0217] This application also provides a charging pile, which includes a liquid cooling device, a power module, and a charging gun. The liquid cooling device includes a liquid cooling gun plug, a liquid cooling connection confirmation circuit, and a liquid cooling system. The liquid cooling gun plug includes a liquid cooling plug and a liquid cooling connection confirmation plug. One end of the liquid cooling plug is used to connect to the liquid cooling socket of an electric vehicle, and the other end of the liquid cooling plug is connected to the liquid cooling system via a pipe. One end of the liquid cooling connection confirmation plug is used to connect to the liquid cooling connection confirmation socket of the electric vehicle, and the other end of the liquid cooling connection confirmation plug is connected to the liquid cooling connection confirmation circuit. The liquid cooling device is used to receive a message sent from the electric vehicle indicating a successful connection between the liquid cooling socket and the liquid cooling plug. In response to the successful connection of the liquid cooling socket and the liquid cooling plug, the liquid cooling system is used to output coolant to the electric vehicle through the liquid cooling plug.

[0218] For details regarding liquid cooling equipment in charging stations, please refer to the specific information about liquid cooling equipment mentioned above; further details will not be repeated here.

[0219] In addition, this application also provides a control guidance circuit for electric vehicles and liquid cooling equipment. The control guidance circuit includes a connection confirmation circuit. The electric vehicle includes a liquid cooling socket and a liquid cooling connection confirmation socket. The liquid cooling equipment includes a liquid cooling plug and a liquid cooling connection confirmation plug.

[0220] One end of the liquid cooling socket is used to connect to one end of the liquid cooling plug, and the other end of the liquid cooling socket is used to connect to the thermal management system of the power battery of the electric vehicle. The other end of the liquid cooling plug is used to receive or output coolant.

[0221] The connection confirmation circuit includes a vehicle-side connection confirmation circuit located in the electric vehicle and a pile-side connection confirmation circuit located in the liquid cooling equipment. The vehicle-side connection confirmation circuit is connected to the liquid cooling socket, and the pile-side connection confirmation circuit is connected to the liquid cooling plug.

[0222] When the liquid-cooled plug is connected to the liquid-cooled socket, the vehicle-end connection confirmation circuit and the pile-end connection confirmation circuit form a loop, and the voltage at the detection point in the loop is used to indicate the connection status of the liquid-cooled plug and the liquid-cooled socket.

[0223] The control guidance circuit in this embodiment can be applied to electric vehicles and liquid cooling equipment. In other words, a portion of the connection confirmation circuit (i.e., the vehicle-side connection confirmation circuit) is located in the electric vehicle, and another portion (i.e., the terminal-side connection confirmation circuit) is located in the liquid cooling equipment. When the liquid cooling plug is not connected to the liquid cooling socket, the vehicle-side connection confirmation circuit in the electric vehicle and the terminal-side connection confirmation circuit in the liquid cooling equipment are separate circuits. Only when the liquid cooling plug is connected to the liquid cooling socket can the vehicle-side connection confirmation circuit in the electric vehicle and the terminal-side connection confirmation circuit in the liquid cooling equipment form a loop.

[0224] In existing technologies, the connection port of the under-vehicle cooling system is only a single inlet / outlet. When the charging pile is charging the electric vehicle's power battery, the electric vehicle and the under-vehicle cooling system cannot recognize whether they are connected, which affects the normal high-power charging of the power battery by the charging pile. In the embodiments of this application, the voltage of the detection point in the control guide circuit can indicate the connection status of the liquid cooling plug and the liquid cooling socket. Therefore, when the voltage of the detection point indicates that the liquid cooling socket and the liquid cooling plug are successfully connected, when the charging pile charges the power battery at high power, the liquid cooling device cools the power battery by injecting a cooling medium, thereby solving the heat dissipation problem during power battery charging and improving the charging power of the charging device for the power battery.

[0225] The specific circuit configuration of the control and guidance circuit will be described below.

[0226] In one embodiment, the liquid cooling device further includes a grounding plug, and the electric vehicle further includes a grounding socket. One end of the grounding plug is used to connect to one end of the grounding socket, and the other end of the grounding plug is used to connect to the device ground platform. The other end of the grounding socket is used to connect to the vehicle body ground platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket. The liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug.

[0227] The vehicle-end connection confirmation circuit includes a first vehicle-end connection confirmation circuit, which includes a first resistor and a first voltage source. The first liquid-cooled connection confirmation socket is connected to the first voltage source through the first resistor.

[0228] The pile end connection confirmation circuit includes a first pile end connection confirmation circuit, which includes a second resistor. The first liquid-cooled connection confirmation plug is connected to the equipment ground platform through the second resistor.

[0229] The test point is located between the first liquid-cooled connection confirmation socket and the first resistor.

[0230] In one embodiment, the voltage at the detection point between the first liquid-cooled connection confirmation socket and the first resistor reaches a first preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0231] Refer to the above Figure 4 In this embodiment of the application, the first resistor and the second resistor respectively include resistors R5 and R3, the first voltage source is U2, and the detection point between the first resistor and the first liquid-cooled connection confirmation socket is detection point 2.

[0232] Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 2 is connected to the first voltage source U2, the voltage at detection point 2 should be the voltage output by the first voltage source U2. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the first voltage source U2 form a circuit through the resistor R5 in the electric vehicle, the resistor R3 in the liquid-cooling device, and the grounding wire in the liquid-cooling device. Due to the voltage division function of the resistors, the voltage at detection point 2 will reach the first preset value.

[0233] For example, if the voltage output of the first voltage source U2 is set to 12V, and the resistance values ​​of R3 and R5 are equal, then the first preset value is 6V. Under this design, if the voltage at detection point 2 is 6V, it indicates that the liquid cooling socket and liquid cooling plug are in a connected state.

[0234] For example, the voltage output of the first voltage source U2 is still set to 12V, but the resistance values ​​of R3 and R5 are different. For example, R3 is 2Ω and R5 is 4Ω, then the first preset value is 4V. Under this design, if the voltage at detection point 2 is 4V, it indicates that the liquid cooling socket and liquid cooling plug are in a connected state.

[0235] 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 liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 2 reaches the first preset value, it indicates that the liquid cooling socket is successfully connected to the liquid cooling plug.

[0236] 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 liquid-cooled socket is not connected to the liquid-cooled plug. If the voltage at the detection point reaches a first preset value, it indicates that the liquid-cooled socket and the liquid-cooled plug are connected. The voltage at the detection point can indicate the connection status of the liquid-cooled socket and the liquid-cooled plug. When the voltage at the detection point indicates that the liquid-cooled socket and the liquid-cooled plug are successfully connected, when the charging pile charges the power battery at high power, the liquid-cooling device cools the power battery by injecting a cooling medium, thereby meeting the heat dissipation requirements of the power battery during high-power charging, which is beneficial to improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0237] In one embodiment, the vehicle-end connection confirmation circuit further includes a second vehicle-end connection confirmation circuit, which includes a third resistor, and the second liquid-cooled connection confirmation socket is connected to the vehicle body platform through the third resistor.

[0238] 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 liquid-cooled connection confirmation plug is connected to the second voltage source through the fourth resistor.

[0239] The test point is located between the second liquid-cooled connection confirmation plug and the fourth resistor.

[0240] In one embodiment, the voltage at the detection point between the first liquid-cooled connection confirmation socket and the first resistor reaches a first preset value, and the voltage at the detection point between the second liquid-cooled connection confirmation plug and the fourth resistor reaches a second preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0241] Refer to the above Figure 4 In this embodiment, the third and fourth resistors include R4 and R1, respectively. The second voltage source in the liquid cooling device is U1, and the detection point between the second liquid cooling connection confirmation plug and the fourth resistor is detection point 1.

[0242] Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to the second voltage source U1 and detection point 2 is connected to the first voltage source U2, the voltage at detection point 1 should be the output voltage of the second voltage source U1, and the voltage at detection point 2 should be the output voltage of the first voltage source U2. Only when the liquid-cooled socket and the liquid-cooled plug are connected, the second voltage source U1 in the liquid-cooled device forms a circuit through resistor R1, resistor R4 in the electric vehicle, and the first voltage source U2 forms a circuit through resistors R5 and R3 and the grounding wire in the liquid-cooled device. Due to the voltage division function of the resistors, the voltage at detection point 1 will reach the second preset value, and the voltage at detection point 2 will reach the first preset value.

[0243] For example, if the output voltage of the first voltage source U2 and the second voltage source U1 is set to 12V, and the resistance values ​​of R1 and R4 are equal, and the resistance values ​​of R5 and R3 are equal, then the first preset value and the second preset value are 6V. Under this design, if the voltage at detection point 1 and detection point 2 is 6V, it indicates that the liquid-cooled socket and the liquid-cooled plug are in a connected state.

[0244] Therefore, based on the above analysis, if the voltage at detection point 2 is the output voltage of the first voltage source U2 and the voltage at detection point 1 is the output voltage of the second voltage source U1, it indicates that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 2 reaches the first preset value and the voltage at detection point 1 reaches the second preset value, it indicates that the liquid cooling socket and the liquid cooling plug are successfully connected.

[0245] In some embodiments, the connection status of the liquid-cooled socket and the liquid-cooled plug can also be determined based on the voltage at detection point 1.

[0246] In this embodiment, since the detection points are connected to a voltage source, if the voltage at the detection point is the same as the voltage output by the voltage source, it indicates that the liquid-cooled socket is not connected to the liquid-cooled plug. If the voltages at the two detection points reach a first preset value and a second preset value respectively, it indicates that the liquid-cooled socket and the liquid-cooled plug are connected. The voltage at the detection points indicates the connection status of the liquid-cooled socket and the liquid-cooled plug. When the voltage at the detection points indicates a successful connection, the liquid-cooling device cools the power battery by injecting a cooling medium into the battery when the charging pile charges it at high power. This meets the heat dissipation requirements of the power battery during high-power charging, improving the charging power of the power battery and reducing the charging time of the electric vehicle.

[0247] In one embodiment, the second terminal connection confirmation circuit further includes a normally closed switch located between the fourth resistor and the second liquid-cooled connection confirmation plug.

[0248] In one embodiment, the detection point includes two detection points, one of which is located between the fourth resistor and the normally closed switch, and the other of which is located between the second liquid-cooled connection confirmation plug and the normally closed switch.

[0249] In one embodiment, the voltage at the detection point between the fourth resistor and the normally closed switch and the detection point between the second liquid-cooled connection confirmation plug and the normally closed switch both reach a second preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0250] refer to Figure 5 In this embodiment, the two detection points are detection point 1 and detection point 4. For the specific judgment process, please refer to the above regarding... Figure 5 The content will not be repeated here.

[0251] 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 liquid cooling gun, and the other end of which is connected to the vehicle body platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug.

[0252] The vehicle-end connection confirmation circuit includes a third vehicle-end connection confirmation circuit and a fourth vehicle-end connection confirmation circuit. The third vehicle-end connection confirmation circuit includes a fifth resistor and a third voltage source. The first liquid-cooled connection confirmation socket is connected to the first voltage source through the first resistor, and the second liquid-cooled connection confirmation socket is connected to the vehicle body platform.

[0253] The pile-end connection confirmation circuit includes wires, and the first liquid-cooled connection confirmation plug is connected to the second liquid-cooled connection confirmation plug via the wires.

[0254] The test point is located between the fifth resistor and the first liquid-cooled connection confirmation socket.

[0255] In one embodiment, the voltage at the detection point between the fifth resistor and the first liquid-cooled connection confirmation socket reaches a third preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0256] In this embodiment, the fifth resistor is R5, the third voltage source is U2, and the detection point between the fifth resistor and the first liquid-cooled connection confirmation socket is... Figure 11 Detection point 2 in the diagram. Please refer to the above for details. Figure 11 The relevant content will not be repeated here.

[0257] 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 liquid cooling gun, and the other end of which is connected to the vehicle body platform. The liquid cooling connection confirmation socket includes a first liquid cooling connection confirmation socket and a second liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug includes a first liquid cooling connection confirmation plug and a second liquid cooling connection confirmation plug.

[0258] The vehicle-end connection confirmation circuit includes a fifth vehicle-end connection confirmation circuit and a sixth vehicle-end connection confirmation circuit. The fifth vehicle-end connection confirmation circuit includes a fourth voltage source, and the sixth vehicle-end connection confirmation circuit includes a sixth resistor. The first liquid-cooled connection confirmation socket is connected to the fourth voltage source, and the second liquid-cooled connection confirmation socket is connected to the vehicle body ground platform through the sixth resistor.

[0259] The pile-end connection confirmation circuit includes wires, and the first liquid-cooled connection confirmation plug is connected to the second liquid-cooled connection confirmation plug via the wires.

[0260] The test point is located between the sixth resistor and the second liquid-cooled connection confirmation socket.

[0261] In one embodiment, the voltage at the detection point between the sixth resistor and the second liquid-cooled connection confirmation socket reaches a fourth preset value, indicating that the liquid-cooled plug and the liquid-cooled socket are successfully connected.

[0262] In this embodiment, the sixth resistor is R5', the fourth voltage source is U2, and the detection point between the sixth resistor and the second liquid-cooled connection confirmation socket is... Figure 12 Detection point 3 in the diagram. Refer to the above for the specific procedure. Figure 12 The relevant content will not be repeated here.

[0263] In one embodiment, the control guidance circuit further includes a communication circuit, the liquid cooling device further includes a communication plug, and the vehicle socket further includes a communication socket. The communication circuit includes a first communication circuit located in the liquid cooling device and a second communication circuit located in the electric vehicle. One end of the first communication circuit is connected to the controller of the liquid cooling device, and the other end of the first communication circuit is connected to the communication plug. One end of the second communication circuit is connected to the controller of the electric vehicle, and the other end of the second communication circuit is connected to the communication socket.

[0264] The communication socket and communication plug in this embodiment are... Figures 4-6 as well as Figures 11-12 For details on the sockets and plugs corresponding to S+ and S-, please refer to [link / reference]. Figure 7 The relevant content regarding S+ and S- will not be repeated here.

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

[0266] The auxiliary power socket and auxiliary power plug in the embodiments of this application can be referred to... Figure 7 The design will not be elaborated upon further.

[0267] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control guide circuit applied to an electric vehicle and a liquid cooling device, characterized by, The control guide circuit comprises a connection confirmation circuit, the electric vehicle comprises a liquid cooling socket and a liquid cooling connection confirmation socket, and the liquid cooling device comprises a liquid cooling plug and a liquid cooling connection confirmation plug; 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 a thermal management system of a power battery of the electric vehicle, and the other end of the liquid cooling plug is used for receiving or outputting cooling liquid; The connection confirmation circuit comprises a vehicle-end connection confirmation circuit of the electric vehicle and a pile-end connection confirmation circuit of the liquid cooling device, the vehicle-end connection confirmation circuit is connected to the liquid cooling socket, and the pile-end connection confirmation circuit is connected to the liquid cooling plug; When the liquid cooling plug is connected to the liquid cooling socket, the vehicle-end connection confirmation circuit and the pile-end connection confirmation circuit form a loop, and the voltage of a detection point in the loop is used to indicate the connection state of the liquid cooling plug and the liquid cooling socket; wherein, The liquid cooling device further comprises a grounding plug, and the electric vehicle further comprises a grounding socket, one end of the grounding plug is used for connecting one end of the grounding socket, and the other end of the grounding plug is used for connecting a device ground platform of the liquid cooling device, and the other end of the grounding socket is used for connecting a vehicle body ground platform of the electric vehicle; The liquid cooling connection confirmation socket comprises a second liquid cooling connection confirmation socket, the liquid cooling connection confirmation plug comprises a second liquid cooling connection confirmation plug, the vehicle-end connection confirmation circuit comprises a second vehicle-end connection confirmation circuit, the second vehicle-end connection confirmation circuit comprises a third resistor, the second liquid cooling connection confirmation socket is connected to the vehicle body ground platform through the third resistor, the pile-end connection confirmation circuit comprises a second pile-end connection confirmation circuit, the second pile-end connection confirmation circuit comprises a fourth resistor, a second voltage source and a normally closed switch, the second liquid cooling connection confirmation plug is connected to the second voltage source through the fourth resistor, and the normally closed switch is connected between the second liquid cooling connection confirmation plug and the fourth resistor; The detection points in the loop comprise a first detection point and a second detection point, the first detection point is located between the fourth resistor and the normally closed switch, and the second detection point is located between the second liquid cooling connection confirmation plug and the normally closed switch.

2. The control steering circuit according to claim 1, characterized in that, The liquid cooling connection confirmation socket further comprises a first liquid cooling connection confirmation socket, and the liquid cooling connection confirmation plug further comprises a first liquid cooling connection confirmation plug; The vehicle-end connection confirmation circuit further comprises a first vehicle-end connection confirmation circuit, the first vehicle-end connection confirmation circuit comprises a first resistor and a first voltage source, and the first liquid cooling connection confirmation socket is connected to the first voltage source through the first resistor; The pile-end connection confirmation circuit further comprises a first pile-end connection confirmation circuit, the first pile-end connection confirmation circuit comprises a second resistor, and the first liquid cooling connection confirmation plug is connected to the device ground platform through the second resistor; The detection points in the loop further comprise a third detection point, and the third detection point is located between the first liquid cooling connection confirmation socket and the first resistor.

3. The control steering circuit according to claim 2, wherein The voltage of the third detection point between the first liquid cooling connection confirmation socket and the first resistor reaches a first preset value, indicating that the liquid cooling plug is successfully connected with the liquid cooling socket.

4. The control pilot circuit of any one of claims 1 to 3, wherein, The voltage of the first detection point between the fourth resistor and the normally closed switch and the voltage of the second detection point between the second liquid cooling connection confirmation plug and the normally closed switch both reach a second preset value, indicating that the liquid cooling plug is successfully connected with the liquid cooling socket.

5. The control pilot circuit of any one of claims 1 to 3, wherein, The control guide circuit further comprises a communication circuit, the liquid cooling device further comprises a communication plug, and the electric vehicle further comprises a communication socket. The communication circuit comprises a first communication circuit located in the liquid cooling device and a second communication circuit located in the electric vehicle, one end of the first communication circuit is connected with the controller of the liquid cooling device, 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.

6. The control pilot circuit of any one of claims 1 to 3, wherein, The control guide circuit further comprises an auxiliary power supply circuit, the liquid cooling device further comprises an auxiliary power supply plug, and the electric vehicle further comprises an auxiliary power supply socket. The auxiliary power supply circuit comprises a first auxiliary power supply circuit located in the liquid cooling device 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 liquid cooling device, 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.

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