Charging connection device, electric vehicle, and charging pile

Abstract

The present application provides a charging connection device, an electric vehicle, and a charging pile. The charging connection device is applied to the electric vehicle. The charging connection device comprises a plurality of groups of charging loop switches and a plurality of groups of direct-current sockets, each group of charging loop switches comprises two switches, each group of direct-current sockets among the plurality of groups of direct-current sockets is used for being connected to a group of direct-current plugs of the charging pile, and each group of direct-current sockets comprises a positive direct-current socket and a negative direct-current socket. Each group of direct-current sockets is connected to a power battery of the electric vehicle by means of one group of charging loop switches, and different groups of direct-current sockets are connected to the power battery by means of different groups of charging loop switches; and each group of direct-current sockets is used for receiving currents outputted by different charging modules in the charging pile. According to embodiments of the present application, a charging power for charging the power battery can be increased, and a charging speed is increased.

Description

Charging connection device, electric vehicle and charging pile

[0001] This application claims priority to the Chinese patent application with application number 202311805427.4 filed with the State Intellectual Property Office of China on December 25, 2023, and priority to the Chinese patent application with invention name “A charging device, a charging pile and a charging connection device, an electric vehicle”, as well as priority to the Chinese patent application with application number 202410174335.9 filed with the State Intellectual Property Office of China on February 6, 2024, and priority to the Chinese patent application with invention name “A charging connection device, an electric vehicle and a charging pile”, all of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of charging, and in particular to a charging connection device, an electric vehicle, and a charging pile. Background Art

[0003] With the continuous development of electric vehicles, users' demand for charging power is gradually increasing. Currently, most charging stations charge electric vehicle power batteries through a single DC port, resulting in low charging power. Moreover, the power lines connected to the charging modules have current limitations. Even if the charging modules are capable of outputting high currents, due to the current limitations of the power lines, the current output of the charging modules will not exceed the maximum current allowed by the power lines to which they are connected. This results in low charging power and makes it difficult to achieve a charging speed of one kilometer per second.

[0004] Summary of the Invention

[0005] This application provides a charging connection device, an electric vehicle, and a charging station that can increase the charging power for power batteries, thereby meeting the demand for high-power charging of electric vehicles. This facilitates a charging speed of one kilometer per second, that is, it can charge an electric vehicle for one kilometer in one second, providing users with a "cup of coffee, fully charged" charging experience.

[0006] In a first aspect, the present application provides a charging connection device for use with an electric vehicle. The charging connection device includes multiple sets of charging circuit switches and multiple sets of DC sockets, each set of charging circuit switches including two switches. Each set of DC sockets in the multiple sets is used to connect to a set of DC plugs on a charging pile, and each set of DC sockets includes a positive DC socket and a negative DC socket. Each set of DC sockets is connected to the electric vehicle's power battery via a set of charging circuit switches, and different sets of DC sockets are connected to the power batteries via different sets of charging circuit switches. Each set of DC sockets is used to receive current output by different charging modules in the charging pile.

[0007] The charging connection device in the embodiment of the present application includes multiple sets of DC sockets, each set of DC sockets is used to receive the current output by a different set of charging modules in the charging pile. The multiple sets of DC sockets in the charging connection device can simultaneously receive the current output by the charging pile. Compared with an electric vehicle including a single set of DC sockets, the embodiment of the present application can increase the charging power for charging the power battery, thereby helping to meet the demand for high-power charging of electric vehicles. This is conducive to achieving a charging speed of one kilometer per second, that is, it is conducive to charging an electric vehicle with enough energy to travel one kilometer in one second, giving users a "cup of coffee, fully charged" charging experience.

[0008] Furthermore, each group of DC sockets is connected to the electric vehicle's power battery via a charging circuit switch, and different groups of DC sockets are connected to the power battery via different sets of charging circuit switches. If the charging circuit connected to some groups of DC sockets shorts, the charging circuit switches corresponding to these groups of DC sockets can be controlled to disconnect, preventing the short-circuit current from spreading to the power battery and effectively protecting the electric vehicle. Furthermore, when some groups of DC sockets are connected to their corresponding DC plugs, the charging circuit switches connected to other groups of DC sockets can be controlled to disconnect, eliminating voltage on these groups of DC sockets. This prevents personal injury from accidental contact by users and protects user safety.

[0009] In combination with the first aspect, in one possible design, the charging connection device is used to send a message to the charging pile, where the message includes information for instructing each group of DC plugs of the charging pile to output current of the same magnitude.

[0010] In an embodiment of the present application, the message sent by the charging connection device to the charging pile includes information for instructing each group of DC plugs of the charging pile to output the same amount of current, so that the charging connection device can receive the same amount of current output by each group of DC plugs. In this way, the current flowing through the transmission lines connected to each group of DC sockets is the same, thereby solving the problem of uneven contact resistance and uneven transmission current of multiple transmission lines.

[0011] In conjunction with the first aspect, in one possible design, the message also includes voltage information. When multiple sets of DC sockets are connected to the same power battery, the message includes information indicating that each set of DC plugs outputs the same voltage. Alternatively, when multiple sets of DC sockets are connected to different power batteries, the message includes information indicating that each set of DC plugs outputs the same or different voltages.

[0012] In the embodiment of the present application, when multiple sets of DC sockets are connected to the same power battery, the message sent by the charging connection device to the charging pile includes information indicating that each set of DC plugs outputs the same voltage to ensure normal charging. This is because if the message sent by the charging connection device to the charging pile includes information indicating that the multiple sets of DC plugs output different voltages, there will be a voltage difference between the circuits used by each set of DC plugs to charge the power battery, resulting in circulating currents between the multiple charging circuits, which may cause false alarms and affect the normal charging of the power battery.

[0013] When multiple sets of DC sockets are connected to different power batteries, the message sent by the charging connection device to the charging pile includes information indicating whether each set of DC plugs should output the same or different voltages. In other words, in this case, each set of DC plugs can output the same or different voltages. Even if there is a voltage difference between the circuits used by each set of DC plugs to charge the power battery, since the multiple sets of DC sockets are connected to different power batteries, circulating current and false alarms will not occur between the two charging circuits, thus ensuring the normal charging process. Moreover, the charging connection device sending messages including information indicating whether each set of DC plugs should output the same or different voltages helps the charging pile output a voltage corresponding to its own capabilities, thereby improving the flexibility of the charging pile's output voltage.

[0014] In combination with the first aspect, in one possible design, the charging connection device further includes multiple fuses, with a fuse connected in series between each set of DC sockets and the power battery. Each fuse is connected in series with one of the corresponding charging circuit switches and then connected between the DC socket and the power battery.

[0015] In the embodiment of the present application, a fuse is connected in series between each set of DC sockets and the power battery. Each fuse has a corresponding fuse rating. When the current flowing through the fuse exceeds its own fuse rating, if the corresponding action is not taken in time, the fuse's fuse may melt. Once the fuse's fuse melts, the fuse must be replaced. Otherwise, the DC plug connected to the fuse will not be able to charge the power battery through the corresponding DC port. Therefore, the function of the fuse is to enable the charging connection device to perform further actions to minimize the melting of the fuse's fuse when the current flowing through the fuse exceeds its own fuse rating, thereby avoiding the need for fuse replacement and ensuring the normal charging process.

[0016] In combination with the first aspect, in one possible design, the charging connection device is used to disconnect the charging circuit switch connected to the fuse when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line.

[0017] In an embodiment of the present application, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging circuit switch connected to the fuse is disconnected to avoid damage to the transmission line caused by excessive current in the transmission line where the fuse is located, which is conducive to the normal charging of the power battery.

[0018] In combination with the first aspect, in one possible design, the charging connection device is further used to: send a message to the charging pile for requesting a change in charging current.

[0019] In this embodiment of the present application, after the charging connection device disconnects the charging circuit switch connected to the fuse, the DC plug connected to the fuse cannot charge the power battery through the DC port, resulting in a decrease in charging power. In this case, the charging connection device can also send a message to the charging pile to request a change in charging current, which is beneficial for increasing charging power, improving charging speed, and enhancing user experience.

[0020] In combination with the first aspect, in one possible design, the charging connection device is used to: when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, send a message to the charging pile requesting to reduce the current output by the DC plug connected to the DC socket connected to the fuse.

[0021] In an embodiment of the present application, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging connection device can send a message to the charging pile requesting to reduce the current output by the DC plug connected to the DC socket connected to the fuse, so that the current of the transmission line where the fuse is located does not exceed the maximum current value allowed by the corresponding transmission line, thereby avoiding damage to the transmission line caused by excessive current of the transmission line where the fuse is located, which is conducive to the normal charging of the power battery.

[0022] In conjunction with the first aspect, in one possible design, the charging connection device further includes at least one isolated DC-DC circuit and at least one insulation detection device. Each isolated DC-DC circuit corresponds to at least one insulation detection device, and each isolated DC-DC circuit is connected in series between the charging circuit switch and the power battery. Each insulation detection device is configured to perform insulation testing on the circuit between the corresponding isolated DC-DC circuit and the output terminal of the charging module connected to the corresponding DC plug during charging of the electric vehicle.

[0023] In this embodiment of the present application, at least one isolated DC-DC circuit in the charging connection device corresponds to at least one insulation detection device. Each isolated DC-DC circuit is connected in series between the charging circuit switch and the power battery. During the electric vehicle charging process, each insulation detection device can perform insulation testing on the circuit between the corresponding isolated DC-DC circuit and the output terminal of the charging module connected to the corresponding DC plug to determine whether the tested circuit has safety hazards such as leakage, thereby ensuring the electrical safety of users and the surrounding environment.

[0024] In conjunction with the first aspect, in one possible design, the charging connection device is configured to: determine whether the charging connection device is connected to a first charging gun or a second charging gun, where the first charging gun includes multiple sets of DC plugs, and the second charging gun includes a single set of DC plugs. When the charging connection device is determined to be connected to the first charging gun, the message sent to the charging pile includes information indicating that the multiple sets of DC plugs output the same current; when the charging connection device is determined to be connected to the second charging gun, the message sent to the charging pile includes information indicating the current output by the single set of DC plugs.

[0025] In an embodiment of the present application, the charging connection device can send different messages to the charging pile based on the type of charging plug it is connected to. Specifically, when the charging plug identified by the charging connection device is a first charging plug, the message sent by the charging connection device to the charging pile includes information indicating that multiple sets of DC plugs output the same current. When the charging connection device identifies that the charging plug is a second charging plug, the message sent by the charging connection device to the charging pile includes information indicating the current output by a set of DC plugs. This avoids the situation where the current information included in the message sent by the charging connection device to the charging pile does not match the actual connection status of the DC plug and DC socket, which may cause the charging connection device to need to send the message again. This embodiment of the present application facilitates rapid confirmation of charging parameters between the charging connection device and the charging pile, thereby facilitating the power battery to quickly enter the charging stage. In addition, when the charging plug identified by the charging connection device is a first charging plug, the message sent by the charging connection device to the charging pile includes information indicating that multiple sets of DC plugs output the same current. On the one hand, it can improve charging power and speed, and can also solve the problem of uneven transmission current and resulting uneven contact resistance between the two transmission lines.

[0026] In conjunction with the first aspect, in one possible design, the charging connection device is further configured to: when the charging connection device is connected to a first charging gun, if the charging circuit switches connected to some of the multiple groups of DC sockets become stuck, send a message to the charging pile requesting that the DC plugs connected to some of the DC sockets stop outputting DC power. The charging connection device is further configured to: when the charging connection device is connected to a second charging gun, if the charging circuit switches connected to a group of DC sockets connected to the second charging gun become stuck, send a message to the charging pile requesting that the DC plugs connected to a group of DC sockets stop outputting DC power.

[0027] In an embodiment of the present application, the charging connection device can, based on the type of charging gun connected to it and the sticking condition of the charging circuit switch connected to the DC socket, send a message to the charging pile requesting that the DC plugs connected to some or a group of DC sockets stop outputting DC power. This ensures personal safety. This is because if the charging circuit switch connected to a DC socket is stuck, and the DC plug connected to the DC socket continues to output DC power, when it is necessary to disconnect the charging circuit switch connected to the DC socket, the sticking charging circuit switch cannot be completely disconnected, resulting in the DC socket being charged. A user may accidentally touch the DC socket, causing personal injury.

[0028] In combination with the first aspect, in one possible design, the charging connection device further includes a first connection confirmation socket and a first connection confirmation circuit, and the first connection confirmation socket is connected to the first connection confirmation circuit. When the charging connection device is connected to the charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the charging gun. The charging connection device is used to: when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a first preset value, confirm that the electric vehicle is connected to the first charging gun; or when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a second preset value, confirm that the electric vehicle is connected to the second charging gun, wherein the first preset value is different from the second preset value.

[0029] In an embodiment of the present application, the charging connection device can confirm whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage at the detection point in the first connection confirmation circuit. Specifically, when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a first preset value, the charging connection device confirms that the electric vehicle is connected to the first charging gun; when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a second preset value, the charging connection device confirms that the electric vehicle is connected to the second charging gun. This can improve the accuracy of the charging connection device in confirming the type of connected charging gun, which is beneficial for the charging connection device to send different messages to the charging pile based on the type of charging gun it is connected to.

[0030] In addition, the embodiment of the present application confirms whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage of the detection point in the first connection confirmation circuit. The first connection confirmation circuit can be a connection confirmation circuit connected to the existing connection confirmation socket CC2, that is, the type of charging gun can be confirmed by using the existing connection confirmation circuit, which is simple and reliable to implement.

[0031] In combination with the first aspect, in one possible design, the charging connection device is also used to: when the voltage at the detection point is a first preset value, confirm that the charging connection device is successfully connected to the first charging gun; when the voltage at the detection point is a second preset value, confirm that the charging connection device is successfully connected to the second charging gun.

[0032] In an embodiment of the present application, when the voltage at the detection point is a first preset value, the charging connection device confirms that it is successfully connected to the first charging gun; when the voltage at the detection point is a second preset value, the charging connection device confirms that it is successfully connected to the second charging gun; this can improve the accuracy of the charging connection device in confirming the connection to the first charging gun or the second charging gun, which is beneficial for the charging connection device to send different messages to the charging pile according to the type of charging gun it is connected to.

[0033] In conjunction with the first aspect, in one possible design, the first connection confirmation circuit of the charging connection device includes a first resistor unit, the first connection confirmation socket is connected to the voltage source via the first resistor unit, and the detection point is located between the first connection confirmation socket and the first resistor unit.

[0034] In the embodiment of the present application, when the charging connection device is connected to the charging gun, the first connection confirmation circuit of the charging connection device forms a loop with the first connection confirmation circuit of the charging pile. Because the detection point is located between the first connection confirmation socket and the first resistor unit, the charging connection device can confirm that it has been successfully connected to the first charging gun or the second charging gun when the voltage at the detection point reaches the first preset value or the second preset value.

[0035] In conjunction with the first aspect, in one possible design, the charging connection device further includes a first connection confirmation socket, a second connection confirmation socket, a first connection confirmation circuit, and a second connection confirmation circuit. The first connection confirmation socket is connected to the first connection confirmation circuit, and the second connection confirmation socket is connected to the second connection confirmation circuit. When the charging connection device is connected to a first charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the first charging gun, and the second connection confirmation circuit forms a current loop with the second connection confirmation circuit of the charging pile through the second connection confirmation socket and the second connection confirmation plug of the first charging gun. When the charging connection device is connected to a second charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the second charging gun, and the second connection confirmation socket is not connected to the plug of the second charging gun.

[0036] The charging connection device is further used to: when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is a third preset value, confirm that the charging connection device is connected to the first charging gun; or when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is a fourth preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a fifth preset value, confirm that the charging connection device is connected to the second charging gun, wherein the third preset value is different from the fourth preset value.

[0037] In an embodiment of the present application, the charging connection device can confirm whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage at the detection point in the second connection confirmation circuit. Specifically, when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is a third preset value, the charging connection device confirms that the electric vehicle is connected to the first charging gun; when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a fourth preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a fifth preset value, the charging connection device confirms that the electric vehicle is connected to the second charging gun. This can improve the accuracy of the charging connection device in confirming the type of charging gun, which is beneficial for the charging connection device to send different messages to the charging pile based on the type of charging gun it is connected to.

[0038] In combination with the first aspect, in one possible design, the charging connection device is further used to: when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a fifth preset value, confirm that the charging connection device is successfully connected to the first charging gun or the second charging gun.

[0039] In an embodiment of the present application, when the voltage at the detection point in the first connection confirmation circuit is the fifth preset value, the charging connection device confirms that it is successfully connected to the first charging gun or the second charging gun, that is, the charging connection device can still use the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple and reliable to implement.

[0040] In conjunction with the first aspect, in one possible design, the first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket is connected to the voltage source via the first resistor unit. The second connection confirmation circuit of the charging connection device includes a second resistor unit, and the second connection confirmation socket is connected to the voltage source via the second resistor unit. The detection point in the first connection confirmation circuit of the charging connection device is located between the first connection confirmation socket and the first resistor unit, and the detection point in the second connection confirmation circuit of the charging connection device is located between the second connection confirmation socket and the second resistor unit.

[0041] In an embodiment of the present application, the first connection confirmation circuit of the charging connection device includes a first resistor unit, through which the first connection confirmation socket is connected to a voltage source. This first connection confirmation circuit is a conventional connection confirmation circuit for vehicle socket connections. The second connection confirmation circuit of the charging connection device includes a second resistor unit, through which the second connection confirmation socket is connected to a voltage source. This second connection confirmation circuit is a newly designed circuit that only requires a single resistor unit to confirm the type of charging gun. This second connection confirmation circuit is simple in design and low in cost.

[0042] In conjunction with the first aspect, in one possible design, the charging connection device further includes an auxiliary power socket, an auxiliary power circuit, a first connection confirmation socket, and a first connection confirmation circuit. The auxiliary power socket is connected to the electric vehicle controller and the auxiliary power circuit, and the first connection confirmation socket is connected to the first connection confirmation circuit. The auxiliary power circuit of the charging connection device includes a third resistor unit and a first normally closed switch connected in series, and the auxiliary power socket is connected to a voltage source via the third resistor unit and the first normally closed switch. The first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket of the charging connection device is connected to the voltage source via the first resistor unit.

[0043] The charging connection device is configured to: confirm that the charging connection device is connected to the first charging connector when the voltage at a detection point in the auxiliary power circuit of the charging connection device is a sixth preset value; or confirm that the charging connection device is connected to the second charging connector when the voltage at the detection point in the auxiliary power circuit of the charging connection device is a seventh preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is an eighth preset value, wherein the sixth preset value is different from the seventh preset value. The detection point in the auxiliary power circuit of the charging connection device is located between the auxiliary power socket and the third resistor unit, and the detection point in the first connection confirmation circuit of the charging connection device is located between the first connection confirmation socket and the first resistor unit.

[0044] In an embodiment of the present application, the charging connection device can confirm whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage at the detection point in the auxiliary power circuit. Specifically, when the voltage at the detection point in the auxiliary power circuit of the charging connection device is a sixth preset value, the charging connection device confirms that the electric vehicle is connected to the first charging gun; when the voltage at the detection point in the auxiliary power circuit of the charging connection device is a seventh preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is an eighth preset value, the charging connection device confirms that the electric vehicle is connected to the second charging gun. This can improve the accuracy of the charging connection device in confirming the type of charging gun, which is beneficial for the charging connection device to send different messages to the charging pile based on the type of charging gun it is connected to.

[0045] In combination with the first aspect, in one possible design, the charging connection device is further used to: when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is an eighth preset value, confirm that the charging connection device is successfully connected to the first charging gun or the second charging gun.

[0046] In an embodiment of the present application, when the voltage at the detection point in the first connection confirmation circuit is the eighth preset value, the charging connection device confirms that it is successfully connected to the first charging gun or the second charging gun, that is, the charging connection device can still use the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple and reliable to implement.

[0047] In conjunction with the first aspect, in one possible design, the auxiliary power circuit of the charging connection device further includes a second normally-open switch, and the auxiliary power socket is further connected to the electric vehicle's body platform via the second normally-open switch. The charging connection device is further configured to, upon confirming that the charging connection device is connected to a second charging connector, open the first normally-closed switch and close the second normally-open switch.

[0048] In the embodiment of the present application, after confirming that the charging connection device is connected to the second charging gun, the charging connection device can also open the first normally closed switch and close the second normally open switch to ensure the normal charging process. This is because if the first normally closed switch is not opened and the second normally open switch is not closed, the voltage at the detection point in the auxiliary power supply circuit is the voltage output by the voltage source. The charging pile controller confirms that the voltage at the detection point is non-zero and will not close the low-voltage auxiliary power supply circuit switch, which will affect the normal charging process of the power battery.

[0049] In conjunction with the first aspect, in one possible design, the charging connection device further includes a third connection confirmation socket and a third connection confirmation circuit. The third connection confirmation socket is configured to connect to a third connection confirmation plug of the first charging gun or a third connection confirmation plug of the second charging gun. The third connection confirmation circuit includes a fourth resistor unit, and the third connection confirmation socket is connected to the vehicle body ground platform via the fourth resistor unit.

[0050] In an embodiment of the present application, the third connection confirmation socket of the charging connection device is used to connect the third connection confirmation plug of the first charging gun or the third connection confirmation plug of the second charging gun. When the charging connection device is connected to the charging gun, the third connection confirmation circuit of the charging connection device and the third connection confirmation circuit of the charging pile form a current loop, which is beneficial for the charging pile to confirm whether it is successfully connected to the electric vehicle based on the voltage of the detection point of its own third connection confirmation circuit, thereby facilitating the charging of the power battery.

[0051] In a second aspect, an electric vehicle is provided, comprising a charging connection device and a power battery in any possible design in the first aspect, wherein the charging connection device is connected to the power battery and is used to receive direct current from a charging pile and transmit the direct current to the power battery.

[0052] For any possible technical effect achieved in the second aspect, please refer to the description of the technical effect that can be achieved in any possible design in the first aspect above, and no further details will be given here.

[0053] In a third aspect, a charging pile is provided, comprising multiple sets of charging modules, multiple sets of DC power supply circuit switches, and multiple sets of DC plugs. The multiple sets of charging modules correspond to the multiple sets of DC plugs in a one-to-one manner. Each set of charging modules includes multiple charging modules connected in parallel. Each set of DC power supply circuit switches includes two switches. Each set of DC plugs is used to connect to a set of DC sockets of an electric vehicle. Each set of DC plugs includes a positive DC plug and a negative DC plug. Each set of charging modules is connected to a set of DC plugs via a set of DC power supply circuit switches, and different sets of charging modules are connected to different sets of DC plugs via different sets of DC power supply circuit switches.

[0054] The charging pile in the embodiment of the present application includes multiple sets of DC plugs, each of which is used to connect to a set of DC sockets on an electric vehicle. Compared to a charging pile consisting of only one set of DC plugs, the embodiment of the present application can increase the charging power for charging the power battery, thereby helping to meet the demand for high-power charging of electric vehicles. This is conducive to achieving the charging goal of one kilometer per second, that is, it is conducive to charging an electric vehicle with enough energy to travel one kilometer in one second, giving users a charging experience of "a cup of coffee, a fully charged start."

[0055] In this embodiment of the present application, each group of charging modules is connected to a group of DC plugs via a set of DC power supply circuit switches, and different groups of charging modules are connected to different groups of DC plugs via different sets of DC power supply circuit switches. When a short circuit occurs in the charging circuit connected to one set of DC plugs, the set of DC power supply circuit switches corresponding to that DC plug can be controlled to disconnect, thereby preventing the short-circuit current from spreading to the charging modules and effectively protecting the charging pile. Furthermore, when some sets of DC plugs are connected to corresponding sets of DC receptacles, the DC power supply circuit switches connected to other sets of DC plugs can be controlled to disconnect, eliminating voltage on the other sets of DC plugs. This prevents users from accidentally getting an electric shock, thereby protecting their personal safety.

[0056] In combination with the third aspect, in one possible design, when multiple sets of DC plugs are connected to multiple sets of DC sockets, each set of charging modules is used to output the same current and the same voltage; or, when multiple sets of DC plugs are connected to multiple sets of DC sockets, each set of charging modules is used to output the same current and different voltages.

[0057] In an embodiment of the present application, when multiple sets of DC plugs are connected to multiple sets of DC sockets, each set of charging modules can output current of the same magnitude. In this way, the current magnitude of the power transmission lines connected to each set of charging modules is the same, thereby solving the problem of uneven contact resistance and uneven transmission current of multiple power transmission lines.

[0058] When multiple DC plugs are connected to multiple DC sockets, each charging module can output the same voltage to ensure normal charging. This is because, when each charging module is connected to the same power battery through its corresponding DC port, if each charging module outputs a different voltage, there will be a voltage difference between the circuits charging the power battery from each charging module. This will cause circulating currents between the multiple charging circuits, which may cause false alarms and affect the normal charging of the power battery.

[0059] When multiple sets of DC plugs are connected to multiple sets of DC sockets, each set of charging modules can also output voltages of different magnitudes. In particular, when each set of charging modules is connected to different power batteries through corresponding DC ports, even if there is a voltage difference between the circuits used by each charging module to charge the power batteries, since each set of DC charging modules is connected to a different power battery, circulation and false alarms will not occur between the different charging circuits, thereby ensuring the normal charging process.

[0060] In addition, each group of charging modules outputs the same or different voltages, and the charging pile outputs voltages of corresponding magnitudes according to its own capabilities, which is conducive to improving the flexibility of the output voltage of the charging pile.

[0061] In combination with the third aspect, in one possible design, the charging pile also includes multiple fuses, a fuse is connected between each group of charging modules and the corresponding DC plug, and each fuse is connected in series with a switch in the corresponding DC power supply circuit switch and then connected between the charging module and the DC plug.

[0062] In the embodiment of the present application, a fuse is connected between each group of charging modules and the corresponding DC plug. Each fuse has a corresponding fuse rated current. When the current flowing through the fuse is greater than its own fuse rated current, if the corresponding action is not taken in time, the fuse may melt. Once the fuse melts, the fuse needs to be replaced. Otherwise, the charging module connected to the fuse will not be able to charge the power battery through the corresponding DC port. Therefore, the role of the fuse is that when the current flowing through the fuse is greater than its own fuse rated current, the charging pile can take further action to try to avoid the fuse melt, thereby avoiding the need to replace the fuse and ensuring the normal progress of the charging process.

[0063] In combination with the third aspect, in one possible design, the charging pile is used to: disconnect the DC power supply circuit switch connected to the fuse when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line.

[0064] In an embodiment of the present application, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging pile disconnects the DC power supply circuit switch connected to the fuse to avoid damage to the transmission line caused by excessive current in the transmission line where the fuse is located.

[0065] In combination with the third aspect, in a possible design, the charging pile is further used to: adjust the magnitude of the current output by each group of charging modules corresponding to the DC power supply circuit switches in the closed state among the multiple groups of DC power supply circuit switches.

[0066] In this embodiment of the present application, after the charging pile disconnects the DC power supply circuit switch connected to the fuse, the charging module connected to the fuse cannot charge the power battery through the DC port, resulting in a decrease in charging power. In this case, the charging pile can also adjust the current output by each charging module group corresponding to the DC power supply circuit switch in the multiple groups of closed DC power supply circuit switches to increase charging power, improve charging speed, and enhance user experience.

[0067] In combination with the third aspect, in one possible design, the charging pile is used to: when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, reduce the current output by a group of charging modules connected to the fuse.

[0068] In an embodiment of the present application, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging pile can reduce the current output by a group of charging modules connected to the fuse so that the current of the transmission line where the fuse is located does not exceed the maximum current value allowed by the corresponding transmission line, thereby avoiding damage to the transmission line caused by excessive current in the transmission line where the fuse is located, which is conducive to the normal charging of the power battery.

[0069] In conjunction with the third aspect, in one possible design, the charging pile further includes multiple insulation detection devices, each corresponding to a plurality of charging module groups. Each insulation detection device is configured to perform insulation testing on the circuit between the output terminals of a corresponding group of charging modules and the corresponding DC power supply circuit switch when the DC plug is connected to the DC socket.

[0070] In an embodiment of the present application, multiple insulation detection devices in the charging pile correspond one-to-one to multiple groups of charging modules. When the DC plug is connected to the DC socket, each insulation detection device can perform insulation detection on the circuit between the output end of a corresponding group of charging modules and the corresponding DC power supply circuit switch to determine whether the detected circuit has safety hazards such as leakage, thereby ensuring the electrical safety of users and the surrounding environment.

[0071] In conjunction with the third aspect, in one possible design, a charging pile includes a charging gun, which includes multiple sets of DC plugs. The charging pile is configured to, when the charging gun is connected to a DC outlet, control a charging module connected to each set of DC plugs to stop outputting DC power if a DC power supply circuit switch connected to some of the multiple sets of DC plugs becomes stuck.

[0072] In an embodiment of the present application, when a charging gun is connected to a DC outlet, if the DC power supply circuit switches connected to some of the multiple DC plugs in the charging gun become stuck, the charging modules connected to each of these groups of DC plugs are controlled to stop outputting DC power, thereby ensuring personal safety. This is because if the charging circuit switch connected to a DC plug becomes stuck, and the DC plug continues to output DC power, the stuck DC power supply circuit switch cannot be fully disconnected when it is necessary to disconnect the DC plug, leaving the DC plug charged. A user could accidentally touch the DC plug, potentially causing personal injury.

[0073] In conjunction with the third aspect, in one possible design, the charging gun further includes a first connection confirmation plug, a second connection confirmation plug, a third connection confirmation plug, a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit. The first connection confirmation plug is connected to the first connection confirmation circuit, the second connection confirmation plug is connected to the second connection confirmation circuit, and the third connection confirmation plug is connected to the third connection confirmation circuit. When the charging gun is connected to an electric vehicle, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the electric vehicle through the first connection confirmation plug and the first connection confirmation socket of the electric vehicle, the second connection confirmation circuit forms a current loop with the second connection confirmation circuit of the electric vehicle through the second connection confirmation plug and the second connection confirmation socket of the electric vehicle, and the third connection confirmation circuit forms a current loop with the third connection confirmation circuit of the electric vehicle through the third connection confirmation plug and the third connection confirmation socket of the electric vehicle. The charging pile is used to: when the voltage at the detection point in the third connection confirmation circuit of the charging gun is a ninth preset value, confirm that the charging gun is successfully connected to the electric vehicle.

[0074] In the embodiment of the present application, when the charging gun includes multiple sets of DC plugs and three connection confirmation plugs, when the voltage of the detection point in the third connection confirmation circuit of the charging gun is the ninth preset value, the charging pile confirms that the charging gun is successfully connected to the electric vehicle. The third connection confirmation circuit in the embodiment of the present application is a connection confirmation circuit connected to the CC1 plug, that is, the electric vehicle still uses the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple to implement.

[0075] In combination with the third aspect, in one possible design, the first connection confirmation circuit of the charging pile includes a fifth resistance unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the fifth resistance unit; the second connection confirmation circuit of the charging pile includes a sixth resistance unit, and the second connection confirmation plug is connected to the device ground platform through the sixth resistance unit; the third connection confirmation circuit of the charging pile includes a seventh resistance unit, and the third connection confirmation plug is connected to the voltage source through the seventh resistance unit, and the detection point is located between the third connection confirmation plug and the seventh resistance unit.

[0076] In this embodiment of the present application, when the charging pile is connected to the electric vehicle, the third connection confirmation circuit of the charging pile forms a loop with the third connection confirmation circuit of the charging connection device. Because the detection point is located between the third connection confirmation plug and the seventh resistor unit, the charging pile can confirm that the charging gun is successfully connected to the electric vehicle when the voltage at the detection point reaches the ninth preset value.

[0077] In conjunction with the third aspect, in one possible design, the charging gun further includes a first connection confirmation plug, a third connection confirmation plug, an auxiliary power plug, a first connection confirmation circuit, a third connection confirmation circuit, and an auxiliary power circuit. The first connection confirmation plug is connected to the first connection confirmation circuit, the third connection confirmation plug is connected to the third connection confirmation circuit, and the auxiliary power plug is connected to the auxiliary power circuit. The auxiliary power plug is used to power the controller of the electric vehicle. When the charging gun is connected to the electric vehicle, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the electric vehicle through the first connection confirmation plug and the first connection confirmation socket of the electric vehicle. The third connection confirmation circuit forms a current loop with the third connection confirmation circuit of the electric vehicle through the third connection confirmation plug and the third connection confirmation socket of the electric vehicle. The auxiliary power circuit forms a current loop with the auxiliary power circuit of the electric vehicle through the auxiliary power plug and the auxiliary power socket of the electric vehicle. The charging pile is configured to: confirm that the charging gun is successfully connected to the electric vehicle when the voltage at the detection point in the third connection confirmation circuit of the charging gun reaches a tenth preset value.

[0078] In an embodiment of the present application, when the charging gun includes multiple sets of DC plugs, when the voltage of the detection point in the third connection confirmation circuit of the charging gun is the tenth preset value, the charging pile confirms that the charging gun is successfully connected to the electric vehicle. The third connection confirmation circuit in the embodiment of the present application is a connection confirmation circuit connected to the CC1 plug, that is, the electric vehicle still uses the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple to implement.

[0079] In combination with the third aspect, in one possible design, the first connection confirmation circuit of the charging pile includes an eighth resistance unit, and the first connection confirmation plug is connected to the device ground platform of the charging pile through the eighth resistance unit; the third connection confirmation circuit of the charging pile includes a ninth resistance unit, and the third connection confirmation plug is connected to the voltage source through the ninth resistance unit, and the detection point is located between the third connection confirmation plug and the ninth resistance unit; the auxiliary power supply circuit of the charging pile includes a tenth resistance unit, and the auxiliary power supply plug is connected to the device ground platform through the tenth resistance unit.

[0080] In this embodiment of the present application, when the charging pile is connected to the electric vehicle, the third connection confirmation circuit of the charging pile forms a loop with the third connection confirmation circuit of the charging connection device. Because the detection point is located between the third connection confirmation plug and the ninth resistor unit, the charging pile can confirm that the charging gun is successfully connected to the electric vehicle when the voltage at the detection point reaches the tenth preset value. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] FIG1 is a schematic diagram of a charging system according to an embodiment of the present application.

[0082] 2 to 7 are schematic diagrams of the structure of the charging system provided in the embodiments of the present application.

[0083] FIG8 is a schematic diagram of a charging interface.

[0084] 9 to 21 are schematic structural diagrams of the charging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0085] The technical solution in this application will be described below with reference to the accompanying drawings.

[0086] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0087] In the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present application does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and the use of such prefixes should not constitute an unnecessary restriction. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0088] With the development of new energy vehicle technology, many automobile manufacturers have gradually launched electric vehicles. Electric vehicles have become the choice of many users because of their energy saving and environmental protection as well as relatively mature technology.

[0089] This application can be applied to systems where power supply devices and loads charge each other through a power distribution matrix. In particular, for systems that include charging piles and electric vehicles, the charging piles can use power from the grid to charge the electric vehicles, and the electric vehicles can also output their own power back to the grid.

[0090] FIG1 exemplarily shows a schematic structural diagram of a charging system 10 provided in an embodiment of the present application.

[0091] 1(a) and 1(b), the charging system 10 may include a charging station 11 and an electric vehicle 12. The charging station 11 may receive AC power from an external power grid 20, convert the AC power into stable DC power, and transmit the DC power to the electric vehicle 12 to charge the electric vehicle 12. Alternatively, the electric vehicle 12 may also output electrical energy in reverse to the external power grid 20.

[0092] In some embodiments, as shown in FIG1( a ), a charging station 11 may include a charging device 111, at least one charging terminal 112, and at least one charging gun 113. The charging device 111 may be electrically connected to the at least one charging terminal 112, and the at least one charging terminal 112 may be electrically connected to the at least one charging gun 113. In a specific implementation, one charging terminal 112 may be electrically connected to one or more charging guns 113.

[0093] The charging device 111 may include multiple power conversion devices that can convert AC power from the external power grid 20 into stable DC power and then transmit it to the charging terminal 112. The multiple power conversion devices may include, for example, an AC-DC converter and a DC-DC converter. The charging terminal 112 transmits the stable DC power to the electric vehicle 12 via the charging gun 113 to charge the electric vehicle 12.

[0094] The charging terminal 112 may include a housing, a human-computer interaction interface, a charging control unit, a metering and billing unit, etc., and is used to perform information exchange, energy transmission, metering and billing, etc. with the electric vehicle 12.

[0095] The electric vehicle 12 may be a vehicle powered by electricity. The electric vehicle 12 may be a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), or a plug-in hybrid electric vehicle (PHEV).

[0096] In other embodiments, as shown in FIG1( b ), the charging pile 11 may include the human-machine interface, charging control unit, and metering and billing unit directly within the charging device 111. Thus, the charging pile 11 may include only the charging device 111 and at least one charging gun 113 electrically connected to the charging device 111, but not the charging terminal 112. The multiple power conversion devices within the charging device 111 may convert AC power from the external power grid 20 into stable DC power, which is then directly transmitted to the electric vehicle 12 via the charging gun 113.

[0097] Figure 2 shows a schematic diagram of a charging system. Referring to Figure 2, the charging station includes a charging module 1, which charges the power battery of an electric vehicle via a set of DC ports, namely the DC ports DC+ and DC- shown in the figure. When the charging plugs corresponding to the DC ports DC+ and DC- are connected to the charging sockets corresponding to the DC ports DC+ and DC-, and when the DC power supply circuit switches K1 and K2 and the charging circuit switches K5 and K6 are closed, the charging module 1 can charge the power battery via the DC ports DC+ and DC-, as well as the transmission line connecting the power battery and the charging module 1. If the maximum current allowed by the transmission line is 800A, even if the charging module 1 can output a higher current, due to the maximum current limit allowed by the transmission line, the charging module 1 can only charge the power battery at a maximum current of 800A, resulting in low charging power and difficulty in achieving a charging speed of one kilometer per second.

[0098] It should be noted that in the embodiment of the present application and the embodiments below, a group of charging modules or multiple groups of charging modules, each group of charging modules includes multiple charging modules connected in parallel, and the charging modules can be AC-DC modules or DC-DC modules.

[0099] The present application provides a charging system, in which a charging module can charge the power battery of an electric vehicle through multiple sets of DC ports, thereby increasing the charging power for charging the power battery, thereby helping to meet the demand for high-power charging of electric vehicles.

[0100] In one embodiment, as shown in Figure 3, the charging module 1 connects to two sets of DC plugs via a set of DC power supply circuit switches K1 and K2, each of which includes a positive DC plug and a negative DC plug. The power battery is connected to two sets of DC sockets via a set of charging circuit switches K5 and K6, each of which includes a positive DC socket and a negative DC socket. When the DC plugs are connected to the DC sockets and all switches are closed, the charging module 1 can charge the power battery through its two sets of DC ports. In actual charging, assuming the power battery requires a charging current of 1600A and the maximum current allowed by each transmission line is 800A, if the charging module 1 is capable of outputting 1600A, the charging module 1 can charge the power battery at 800A via each of the two transmission lines. That is, each DC port outputs 800A. This allows the charging module 1 to charge the power battery at 1600A, thereby increasing charging efficiency.

[0101] For ease of description, in this application and the following embodiments, the two groups of DC ports include DC ports DC+ and DC-, which are a combination of DC plugs DC+ and DC- and DC sockets DC+ and DC-, and DC ports DC1+ and DC1-, which are a combination of DC plugs DC1+ and DC1- and DC sockets DC1+ and DC1-.

[0102] In one embodiment, as shown in Figure 4, the charging pile includes two charging modules, namely charging module 1 and charging module 2. Charging module 1 is connected to a set of DC plugs DC+ and DC- via a set of DC power supply circuit switches K1 and K2, and charging module 2 is connected to another set of DC plugs DC1+ and DC1- via a set of DC power supply circuit switches K1' and K2'. The power battery in the electric vehicle is connected to two sets of DC sockets, namely DC sockets DC+ and DC- and DC sockets DC1+ and DC1-, via a set of charging circuit switches K5 and K6. When the DC plugs are connected to the DC sockets and all switches are closed, the two charging modules, charging module 1 and charging module 2, charge the power battery through the two sets of DC ports. During actual charging, assuming the power battery requires a charging current of 1600A and the maximum current allowed by each transmission line is 800A, charging module 1 and charging module 2 can each output a current of 800A, resulting in a total current of 1600A transmitted to the power battery. Consequently, the two charging modules, charging module 1 and charging module 2, can jointly charge the power battery at a current of 1600A, thereby increasing the charging power. Furthermore, in the embodiment of the present application, since one set of DC power supply circuit switches K1 and K2 controls charging module 1 to charge the power battery, and another set of DC power supply circuit switches K1' and K2' controls charging module 2 to charge the power battery, that is, different sets of DC power supply circuit switches are connected to different sets of charging modules, the charging pile can adjust the charging current to the power battery according to the power battery's needs, facilitating flexible charging of electric vehicles.

[0103] In one embodiment, as shown in Figure 5, the charging module 1 connects to two sets of DC plugs via a set of DC power supply circuit switches K1 and K2. The power battery connects to one set of DC outlets via a set of charging circuit switches K5 and K6. The power battery connects to another set of DC outlets via another set of charging circuit switches K5' and K6'. When the DC plugs are connected to the DC outlets and all switches are closed, the charging module 1 can charge the power battery through its two sets of DC ports. In actual charging, assuming the power battery requires a charging current of 1600A and the maximum current allowed by each transmission line is 800A, if the charging module 1 is capable of outputting 1600A, the charging module 1 can charge the power battery at a current of 800A via two transmission lines. That is, each set of DC ports outputs 800A. This allows the charging module 1 to charge the power battery at a current of 1600A, thereby increasing charging efficiency. In addition, in an embodiment of the present application, each of the two groups of DC sockets in the electric vehicle is connected to a group of charging circuit switches, wherein the DC sockets DC+ and DC- are connected to the charging circuit switches K5 and K6, and the DC sockets DC1+ and DC1- are connected to the charging circuit switches K5' and K6'. Thus, one group of charging circuit switches K5 and K6 can control the DC sockets DC+ and DC- to charge the power battery, and the other group of charging circuit switches K5' and K6' can control the DC sockets DC1+ and DC1- to charge the power battery. That is, different groups of charging circuit switches respectively control the charging of the power battery through different groups of DC sockets, so that the electric vehicle can adjust the charging current of the power battery according to its own needs, which is conducive to flexible charging of the electric vehicle.

[0104] While the three aforementioned embodiments can improve charging power and flexibly adjust the charging current of electric vehicles, there is a risk that the charging pile and electric vehicle will not be effectively protected if the charging circuit connected to the charging interface shorts, potentially damaging the charging pile and electric vehicle. For example, in Figure 3 , when the charging module 1 charges the power battery via two sets of DC ports, if the charging circuit connected to the DC ports DC1+ and DC1- shorts, the short-circuit current can flow into the charging module 1 through the DC power supply circuit switches K1 and K2, and the short-circuit current can flow into the power battery through the charging circuit switches K5 and K6, potentially damaging the charging pile and electric vehicle. Moreover, when the electric vehicle is connected to any of the 2015 charging guns, 2015+ charging guns, and super charging guns (for the sake of ease of description, the 2015 / 2015+ / super charging guns are used as examples below), the DC plugs DC+ and DC- are connected to the DC sockets DC+ and DC-, while the DC plugs DC1+ and DC1- are not connected to the DC sockets DC1+ and DC1-, so that the DC ports DC1+ and DC1- will be energized. Users may accidentally touch the DC ports DC1+ and DC1-, causing safety problems, which may seriously endanger personal safety.

[0105] Based on this, the present application provides a charging connection device for use in electric vehicles. The charging connection device includes multiple sets of charging circuit switches and multiple sets of DC sockets, each set of charging circuit switches including two switches. Each set of DC sockets in the multiple sets is used to connect to a set of DC plugs in a charging pile, and each set of DC sockets includes a positive DC socket and a negative DC socket. Each set of DC sockets is connected to the power battery of the electric vehicle via a set of charging circuit switches, and different sets of DC sockets are connected to the power batteries via different sets of charging circuit switches. Each set of DC sockets is used to receive current output by different charging modules in the charging pile.

[0106] The charging connection device in the embodiment of the present application includes multiple sets of DC sockets, each set of DC sockets is used to receive the current output by a different set of charging modules in the charging pile. The multiple sets of DC sockets in the charging connection device can simultaneously receive the current output by the charging pile. Compared with the electric vehicle including a single set of DC sockets, the embodiment of the present application can increase the charging power for charging the power battery, thereby helping to meet the demand for high-power charging of electric vehicles. This is conducive to achieving the charging goal of one kilometer per second, that is, it is conducive to charging an electric vehicle with electricity for one kilometer in one second, giving users a "cup of coffee, fully charged" charging experience.

[0107] In this embodiment of the present application, each group of DC sockets is connected to the electric vehicle's power battery via a set of charging circuit switches, and different groups of DC sockets are connected to the power batteries via different sets of charging circuit switches. If the charging circuit connected to some groups of DC sockets shorts, the charging circuit switches corresponding to these groups of DC sockets can be controlled to disconnect, thereby preventing the short-circuit current from spreading to the power battery and effectively protecting the electric vehicle. Furthermore, when some groups of DC sockets are connected to their corresponding groups of DC plugs, the charging circuit switches connected to other groups of DC sockets can be controlled to disconnect, eliminating voltage on these other groups of DC sockets. This prevents personal injury from accidental contact by users and thus protects the user's personal safety.

[0108] The present application also provides a charging pile comprising multiple charging modules, multiple DC power supply circuit switches, and multiple DC plugs. The multiple charging modules correspond to the multiple DC plugs in a one-to-one manner. Each charging module group includes multiple parallel charging modules. Each DC power supply circuit switch includes two switches. Each DC plug group is used to connect to a set of DC sockets of an electric vehicle, and each DC plug group is connected to a different DC socket. Each DC plug group includes a positive DC plug and a negative DC plug. Each charging module group is connected to a set of DC plugs via a set of DC power supply circuit switches, and different charging module groups are connected to different sets of DC plugs via different sets of DC power supply circuit switches.

[0109] The charging pile in the embodiment of the present application includes multiple sets of DC plugs, each of which is used to connect to a set of DC sockets on an electric vehicle. Compared to a charging pile consisting of only one set of DC plugs, the embodiment of the present application can increase the charging power for charging the power battery, thereby helping to meet the demand for high-power charging of electric vehicles. This is conducive to achieving the charging goal of one kilometer per second, that is, it is conducive to charging an electric vehicle with enough energy to travel one kilometer in one second, giving users a charging experience of "a cup of coffee, a fully charged start."

[0110] In this embodiment of the present application, each group of charging modules is connected to a group of DC plugs via a set of DC power supply circuit switches, and different groups of charging modules are connected to different groups of DC plugs via different sets of DC power supply circuit switches. When a short circuit occurs in the charging circuit connected to one set of DC plugs, the set of DC power supply circuit switches corresponding to that DC plug can be controlled to disconnect, thereby preventing the short-circuit current from spreading to the charging modules and effectively protecting the charging pile. Furthermore, when some sets of DC plugs are connected to corresponding sets of DC receptacles, the DC power supply circuit switches connected to other sets of DC plugs can be controlled to disconnect, eliminating voltage on the other sets of DC plugs. This prevents users from accidentally getting an electric shock, thereby protecting their personal safety.

[0111] The present application also provides a charging system, which includes the charging connection device and the charging pile described above. The following is a detailed description of the charging system provided in the present application in conjunction with the accompanying drawings.

[0112] As shown in FIG6 , the present application provides a schematic diagram of a charging system, which includes a charging pile 400 and an electric vehicle.

[0113] It should be understood that the charging pile 400 can be a split charging pile as shown in (a) of Figure 1, or an integrated split pile as shown in (b) of Figure 1, and the electric vehicle can be the electric vehicle 12 shown in (a) and (b) of Figure 1.

[0114] Among them, the charging pile 400 includes multiple groups of charging modules 410, multiple groups of DC power supply circuit switches 420 and multiple groups of DC plugs 430. The multiple groups of charging modules 410 and the multiple groups of DC plugs 430 correspond one to one. Each group of charging modules in the multiple groups of charging modules 410 includes multiple parallel charging modules, each group of DC power supply circuit switches includes two switches, and each group of DC plugs in the multiple groups of DC plugs 430 is used to connect to a group of DC sockets of the electric vehicle, and each group of DC plugs is connected to a different DC socket. Each group of DC plugs includes a positive DC plug and a negative DC plug.

[0115] The charging connection device 500 for an electric vehicle includes multiple sets of charging circuit switches 510 and multiple sets of DC sockets 520. Each set of charging circuit switches includes two switches. Each set of DC sockets in the multiple sets of DC sockets 520 is used to connect to a set of DC plugs of a charging pile. Each set of DC sockets includes a positive DC socket and a negative DC socket.

[0116] Each group of charging modules is connected to a group of DC plugs via a group of DC power supply circuit switches, and different groups of charging modules are connected to different groups of DC plugs via different groups of DC power supply circuit switches.

[0117] Each set of DC sockets is connected to the power battery of the electric vehicle through a set of charging circuit switches, and different sets of DC sockets are connected to the power batteries through different sets of charging circuit switches; each set of DC sockets is used to receive the current output by different charging modules in the charging pile.

[0118] It should be noted that in the embodiment of the present application, multiple sets of DC plugs are located in one charging gun, and multiple sets of DC sockets are located in one vehicle interface.

[0119] In this embodiment of the present application, each charging module in the charging pile charges the power battery via a set of DC ports. The DC plug corresponding to each DC port is connected to the corresponding set of charging modules via a set of DC power supply circuit switches, and the charging socket corresponding to each DC port is connected to the power battery via a set of charging circuit switches. Specifically, the charging plugs corresponding to DC ports DC+ and DC- are connected to charging module 1 via DC charging circuit switches K1 and K2, and the charging sockets corresponding to DC ports DC+ and DC- are connected to the power battery via charging circuit switches K5 and K6. The charging plugs corresponding to DC ports DC1+ and DC1- are connected to charging module 2 via DC charging circuit switches K1' and K2', and the charging sockets corresponding to DC ports DC1+ and DC1- are connected to the power battery via charging circuit switches K5' and K6'. When each set of DC plugs is connected to the corresponding set of DC sockets and all switches are closed, the two charging modules can charge the power battery via their corresponding DC ports.

[0120] For example, assuming the power battery requires a charging current of 1400A and the maximum current allowed by each transmission line is 800A, charging module 1 and charging module 2 can output the same current or different currents. For example, charging module 1 can output a current of 700A and charging module 2 can output a current of 700A, resulting in a total current of 1400A transmitted to the power battery. Thus, the two charging modules, charging module 1 and charging module 2, can jointly charge the power battery at a current of 1400A. Alternatively, charging module 1 can output a current of 800A and charging module 2 can output a current of 600A, resulting in a total current of 1400A transmitted to the power battery. Thus, the two charging modules, charging module 1 and charging module 2, can jointly charge the power battery at a current of 1400A.

[0121] In the embodiment of the present application, since different DC ports are connected to different groups of charging modules through different groups of DC power supply circuit switches, when the charging module charges the power battery through only one DC port, the DC power supply circuit switch connected to the other DC port can be controlled to be disconnected, so that no voltage will exist on the other DC port, which can prevent personal injury caused by accidental touch by the user, thereby protecting the user's personal safety.

[0122] For example, when a charging gun is connected to a vehicle socket, and if the charging gun connected to the vehicle socket is a 2015 / 2015+ / supercharger, the charging pile controller controls the DC power supply circuit switches K1 and K2 to close, and the vehicle controller controls the charging circuit switches K5 and K6 to close, so that charging module 1 can charge the power battery through DC ports DC+ and DC-. Since DC ports DC1+ and DC1- are connected to charging module 2 through DC power supply circuit switches K1' and K2', the charging pile controller can disconnect DC power supply circuit switches K1' and K2', so that charging module 2 does not output current to DC ports DC1+ and DC1-. In other words, DC ports DC1+ and DC1- are de-energized, which can prevent personal injury caused by accidental electric shock to the user, thereby ensuring the user's personal safety.

[0123] In the embodiment of the present application, since different DC ports are connected to different groups of charging modules through different DC power supply circuit switches, and different DC ports are connected to power batteries through different charging circuit switches, when the charging interface is short-circuited, the short circuit of one DC port will not affect the circuit charged through another DC port.

[0124] For example, when a charging gun is connected to a vehicle socket, if the charging gun connected to the vehicle socket is an MCS gun, if the charging circuit containing DC ports DC1+ and DC1- is short-circuited, the charging pile controller can disconnect the DC power supply circuit switches K1' and K2', and the vehicle controller can disconnect the charging circuit switches K5' and K6', thereby disconnecting the circuit used by charging module 2 to charge the power battery through DC ports DC1+ and DC1-, preventing the short-circuit current from spreading to charging module 2 and the power battery, thereby effectively protecting the charging pile and the electric vehicle. However, the DC power supply circuit switches K1, K2 and the charging circuit switches K5, K6 can still be closed, allowing charging module 1 to continue charging the power battery through DC ports DC+ and DC-. In other words, disconnecting the DC power supply circuit switches K1' and K2' and the charging circuit switches K5' and K6' does not affect the states of the DC power supply circuit switches K1, K2 and the charging circuit switches K5, K6, thereby ensuring continuous charging of the power battery and meeting the charging requirements.

[0125] Similarly, when the charging circuit containing the DC ports DC+ and DC- is short-circuited, the charging pile controller can disconnect the DC power supply circuit switches K1 and K2, and the vehicle controller can disconnect the charging circuit switches K5 and K6, thereby disconnecting the circuit through which charging module 1 charges the power battery via the DC ports DC+ and DC-, preventing the short-circuit current from spreading to charging module 1 and the power battery, thereby effectively protecting the charging pile and electric vehicle. However, the DC power supply circuit switches K1' and K2' and the charging circuit switches K5' and K6' can still be closed, allowing charging module 2 to continue charging the power battery via the DC ports DC1+ and DC1-. In other words, disconnecting the DC power supply circuit switches K1 and K2 and the charging circuit switches K5 and K6 does not affect the states of the DC power supply circuit switches K1' and K2' and the charging circuit switches K5' and K6', thereby enabling continuous charging of the power battery and meeting the charging requirements for continued power battery charging.

[0126] It should be noted that in the embodiments of this application, an MCS charging gun can be understood as multiple sets of DC plugs connected to multiple sets of DC outlets, such as the one set of DC plugs DC+ and DC- connected to one set of DC outlets DC+ and DC- in the above embodiment, and another set of DC plugs DC1+ and DC1- connected to another set of DC outlets DC1+ and DC1-. A 2015 gun, 2015+ gun, and supercharger gun can be understood as a set of DC plugs connected to a set of DC outlets, such as the one set of DC plugs DC+ and DC- connected to a set of DC outlets DC+ and DC- in the above embodiment.

[0127] In each embodiment of the present application, the charging module 1 and the charging module 2 can be charging modules in the same charging pile or in different charging piles, without limitation.

[0128] In addition, since the charging module charges the power battery through two charging circuits, after multiple charges, the wear of the two transmission lines is different, resulting in uneven contact resistance of the two lines, which in turn leads to uneven current transmission in the two lines. The uneven current transmission in the two lines will aggravate the different wear of the two transmission lines, thereby further increasing the difference in current size on the two transmission lines.

[0129] In one embodiment, the charging connection device is used to send a message to the charging pile, where the message includes information for instructing each group of DC plugs of the charging pile to output current of the same magnitude.

[0130] Continuing to refer to FIG6 , in an embodiment of the present application, since the two groups of charging modules are connected to different groups of DC charging plugs through different groups of DC power supply circuit switches, the electric vehicle can respectively request information from the two groups of charging modules to instruct each group of charging modules to output the same amount of current, so that the two groups of charging modules in the charging pile can output the same amount of current, thereby solving the problem of uneven contact resistance and uneven transmission current of the two transmission lines. For example, assuming that the charging current required by the power battery is 1400A and the maximum current allowed by each group of transmission lines is 800A, then charging module 1 can output a current of 700A and charging module 2 can output a current of 700A, so that the total current transmitted to the power battery is 1400A. Thus, the two groups of charging modules, charging module 1 and charging module 2, can charge the power battery together with a current of 1400A, and the current output by each group of charging modules is the same, thereby solving the problem of uneven transmission current and the resulting uneven contact resistance of the two transmission lines.

[0131] During the actual charging process, once the vehicle socket and charging gun are physically connected, and the low-voltage auxiliary power-up, charging handshake phase, and charging parameter configuration are complete, the vehicle controller can send a message to the charging pile to set the power battery charging requirements, so that the charging pile can configure the corresponding DC power according to the specific needs of the electric vehicle. Furthermore, if the charging pile includes multiple charging modules, the message sent by the vehicle controller to the charging pile includes information to instruct each charging module to output the same current.

[0132] For example, assuming the power battery requires a charging current of 1400A and the maximum current allowed by each transmission line is 800A, the vehicle controller can send a message to the charging pile including instructions for charging module 1 to output a current of 700A and charging module 2 to output a current of 700A. After receiving this message, if each charging module group has the ability to output the corresponding current, each charging module group can output the corresponding current according to the electric vehicle's request, that is, charging module 1 outputs a charging current of 700A and charging module 2 outputs a charging current of 700A, to ensure the normal charging process.

[0133] If each group of charging modules does not have the ability to output the corresponding charging current, each group of charging modules can adjust the output current according to the message resent by the electric vehicle, or each group of charging modules can output current at its maximum output capacity to directly charge the power battery of the electric vehicle. For example, the message sent by the vehicle controller to the charging pile includes: instructing charging module 1 to output a current of 700A, and charging module 2 to output a current of 700A. However, the maximum current that charging module 1 and charging module 2 can each output is 600A. The charging pile can then provide feedback to the electric vehicle that it cannot meet its charging current requirements and its maximum current output capacity. Furthermore, the vehicle controller can resend a message to the charging pile, which includes: instructing charging module 1 to output a charging current of 600A, and charging module 2 to output a charging current of 600A. As a result, charging module 1 and charging module 2 can each output a charging current of 600A to ensure the normal charging process. Alternatively, each set of charging modules can output current at its maximum output capacity to directly charge the power battery of the electric vehicle, that is, each set of charging modules charges the power battery at a current of 600A.

[0134] As explained above, when a charging pile includes multiple charging modules, the message sent by the vehicle controller includes information indicating that each module outputs the same current. However, the voltage indication depends on the connection between the multiple DC sockets and the power battery in the electric vehicle. See below for details.

[0135] Case 1: Multiple DC sockets connected to the same power battery

[0136] (1) When there is only one power battery and multiple sets of DC sockets are connected to the one power battery, the message sent by the charging connection device to the charging pile includes information indicating that each set of DC sockets outputs the same voltage.

[0137] For example, the message sent by the charging connection device to the charging pile includes information for instructing each set of DC plugs to output a voltage of 300V, so that each set of charging modules outputs a voltage of 300V to ensure the normal progress of the charging process.

[0138] If the message sent by the charging connection device to the charging pile includes information indicating that each set of DC plugs outputs different voltages, this may cause circulating currents and, further, false alarms. For example, if the message sent by the charging connection device to the charging pile includes information indicating that the charging pile outputs voltages of 300V and 400V, then when charging module 1 charges the power battery at a voltage of 300V and charging module 2 charges the power battery at a voltage of 400V, the voltage difference between the circuits used by charging module 1 to charge the power battery and the circuit used by charging module 2 to charge the power battery will cause circulating currents between the two charging circuits, which may cause false alarms and other phenomena, affecting the normal charging of the power battery.

[0139] In some embodiments, a power battery can also be understood as a battery system conductively connected together.

[0140] (2) There are multiple power batteries and the multiple power batteries are not electrically isolated from each other. Multiple groups of DC sockets are connected to the multiple power batteries, which is equivalent to an electric vehicle including only one power battery with a larger capacity. The multiple groups of DC sockets are still connected to the same power battery. The message sent by the charging connection device to the charging pile includes information indicating that each group of DC plugs outputs the same voltage.

[0141] In this case, similar to the reason in (1) in the above case 1, the vehicle controller only needs to request a voltage in the message sent to the charging pile to ensure the normal progress of the charging process.

[0142] Case 2: Multiple DC sockets connected to different power batteries

[0143] When there are multiple power batteries in an electric vehicle and there is electrical isolation between the multiple power batteries, multiple groups of DC sockets are connected to the multiple power batteries accordingly, which is equivalent to multiple groups of DC sockets being connected to different power batteries. The message sent by the charging connection device to the charging pile includes information for indicating whether each group of DC plugs outputs the same or different voltages.

[0144] For example, the message sent by the charging connection device to the charging pile includes instructions for each set of DC plugs to output a voltage of 300V, so that each set of charging modules outputs a voltage of 300V to ensure the normal progress of the charging process.

[0145] Alternatively, the message sent by the charging connection device to the charging pile includes information indicating that the two sets of DC plugs should output voltages of 300V and 400V, respectively. Consequently, the two charging modules output voltages of 300V and 400V, respectively, to ensure normal charging. In this case, due to the electrical isolation between the power batteries, the charging circuits used by each charging module to charge the power batteries are independent. Therefore, even if a voltage difference exists between the two charging circuits, circulating currents and false alarms will not occur between the two charging circuits, thereby ensuring normal charging. Furthermore, the charging connection device sends messages indicating whether each set of DC plugs should output the same or different voltages, which helps increase the flexibility of the voltage output by each set of DC plugs in the charging pile.

[0146] In some embodiments, multiple power batteries with electrical isolation between them can be understood as multiple charging systems with electrical isolation. Multiple power batteries without electrical isolation between them can be understood as a battery system with conductive connection.

[0147] In some cases, the current output by the charging module may exceed the maximum current allowed by the transmission line. If the power battery is charged at a current exceeding the maximum current allowed by the transmission line for a long time, it is very likely to damage the transmission line. Therefore, in this case, a current protection module can be installed on the transmission line to provide overcurrent protection. This application uses a fuse as an example to illustrate the current protection module.

[0148] In one embodiment, as shown in FIG7 , the charging connection device further includes a plurality of fuses 530 , wherein a fuse is connected in series between each set of DC sockets and the power battery, and each fuse is connected in series with a switch in the corresponding charging circuit switch and then connected between the DC socket and the power battery.

[0149] In one embodiment, the charging pile further includes a plurality of fuses 440, a fuse is connected between each group of charging modules and the corresponding DC plug, and each fuse is connected in series with a switch in the corresponding DC power supply circuit switch and then connected between the charging module and the DC plug.

[0150] As shown in (a) of Figure 7, each group of charging modules in the charging pile is connected to a fuse with the corresponding DC plug. As shown in the figure, fuse 1 is connected between charging module 1 and DC plugs DC+ and DC, and fuse 1 is connected in series with DC power supply circuit switch K1 and then connected between charging module 1 and the DC plug; fuse 2 is connected between charging module 2 and DC plugs DC1+ and DC1-, and fuse 2 is connected in series with DC power supply circuit switch K1' and then connected between charging module 2 and the DC plug.

[0151] It should be noted that the fuse 1 can also be connected in series with the DC power supply circuit switch K2 and then connected between the charging module 1 and the DC plug. The fuse 2 can be connected in series with the DC power supply circuit switch K2' and then connected between the charging module 2 and the DC plug.

[0152] Continuing with reference to (a) in FIG7 , a fuse is connected between each set of DC sockets and the power battery in the electric vehicle. As shown in the figure, fuse 3 is connected between the DC sockets DC+ and DC- and the power battery, and fuse 3 is connected in series with the charging circuit switch K5 and then connected between the DC sockets and the power battery; fuse 3' is connected between the DC sockets DC1+ and DC-1 and the power battery, and fuse 3' is connected in series with the charging circuit switch K5' and then connected between the DC sockets and the power battery.

[0153] Similarly, the fuse 3 is connected in series with the charging circuit switch K6 and then connected between the DC socket and the power battery. The fuse 3 ′ is connected in series with the charging circuit switch K6 and then connected between the DC socket and the power battery.

[0154] Each fuse has a corresponding fuse rating. If the current flowing through the fuse exceeds its rated current for a long period of time, and if no action is taken promptly, the fuse's fuse element will melt due to excessive temperature. Once the fuse element melts, the fuse must be replaced. Otherwise, the DC plug connected to the fuse will not be able to charge the power battery through the corresponding DC port. Therefore, the function of the fuse is to, when the current flowing through the fuse element exceeds its rated current, the charging connection device can take further action to minimize the melting of the fuse element, thus avoiding the need for fuse replacement and ensuring the normal charging process.

[0155] The specific protection process is as follows: assuming that the required charging current of the power battery is 1600A, the maximum current allowed by each set of transmission lines is 800A, and the rated current of fuse 1, fuse 2, fuse 3, and fuse 3' are all 800A. The message sent by the charging connection device to the charging pile includes: instructions for charging module 1 to output a current of 800A, and charging module 2 to output a current of 800A. After the charging pile receives this message, under normal circumstances, charging module 1 outputs a current of 800A, and charging module 2 outputs a current of 800A. Each fuse detects that the current passing through it meets the corresponding requirements, so that the charging process proceeds normally.

[0156] Under abnormal circumstances, it is possible that charging module 1 outputs a current of 900A and charging module 2 outputs a current of 700A. Since the current output by charging module 1 is greater than the rated current of fuse 1, the charging connection device can take further action to minimize the melting of fuse 1, thereby avoiding the need to replace the fuse and ensuring the normal charging process. Please see below for details.

[0157] (b) in Figure 7 shows a schematic diagram of a possible charging system. Referring to (b) in Figure 7, the number and position of the fuses in the charging pile shown therein are consistent with the number and position of the fuses in (a) in Figure 7. However, the number of fuses in the charging connection device is different from the number of fuses in (a) in Figure 7. Specifically, in (b) in Figure 7, a fuse 4 is connected between the two groups of DC sockets and the power battery in the charging connection device, and the fuse 4 is arranged between the node after the two groups of charging circuit switches are connected in parallel and the power battery. The protection process of this embodiment is similar to that of (a) in Figure 7 above and will not be repeated here.

[0158] The difference between FIG7 (a) and FIG7 (b) is that in the electric vehicle shown in FIG7 (a), a fuse is connected between each DC port and the power battery. This means that each fuse detects the current on the transmission line to which it is connected. Therefore, the selection of each fuse is only related to the maximum allowable current of the transmission line to which it is connected. For example, the fuse rating of fuse 3 and fuse 3' is 800A. In contrast, in the electric vehicle shown in FIG7 (b), only one fuse is provided between multiple DC ports and the power battery, and this fuse is provided between the node after multiple sets of charging circuit switches are connected in parallel and the power battery. This means that the fuse detects the sum of the currents on multiple transmission lines. Therefore, the selection of this fuse is related to the sum of the maximum allowable currents of multiple transmission lines. For example, the fuse rating of fuse 4 is 1600A. Compared with the embodiment shown in FIG7 (b), the embodiment shown in FIG7 (a) allows for lower specifications of fuses in the electric vehicle, which can further reduce costs.

[0159] As mentioned above, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging pile 400 and the charging connection device 500 can take further action to try to avoid the fuse element from melting. Please see below for details.

[0160] In one embodiment, for the charging connection device, when the current flowing through the power transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding power transmission line, the charging connection device 500 is used to disconnect the charging circuit switch connected to the fuse.

[0161] For the charging pile, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging pile 400 is used to disconnect the DC power supply circuit switch connected to the fuse.

[0162] Referring to (a) in FIG. 7 above, assuming that the required charging current of the power battery is 1600A, the maximum current allowed for each transmission line is 800A, and the fuse ratings of fuses 1, 2, 3, and 3' are all 800A. When charging module 1 outputs a current of 900A and charging module 2 outputs a current of 700A, and the current output by charging module 1 is transmitted to the power battery through fuses 1 and 3, because the current flowing through fuse 1 is greater than the fuse rating of fuse 1, the charging pile disconnects the DC power supply circuit switches K1 and K2 connected to fuse 1. Furthermore, because the current flowing through fuse 3 is greater than the fuse rating of fuse 3, the charging connection device disconnects the charging circuit switches K5 and K6 connected to fuse 3 to prevent damage to the transmission lines where fuses 1 and 3 are located due to excessive current.

[0163] In one embodiment, the charging connection device 500 is further configured to send a message to the charging pile requesting a change in charging current.

[0164] Correspondingly, the charging pile 400 is further used to adjust the magnitude of the current output by each group of charging modules corresponding to the DC power supply circuit switches in the closed state among the multiple groups of DC power supply circuit switches.

[0165] In an embodiment of the present application, when the charging pile and the charging connection device disconnect a fuse with a current greater than the rated current of the fuse, in order to meet the charging needs of the electric vehicle, the charging pile can adjust the current output by each charging module corresponding to the closed DC power supply circuit switch among the multiple sets of DC power supply circuit switches. For example, as described above, because the current flowing through fuse 1 is greater than the rated current of fuse 1, the charging pile disconnects the DC power supply circuit switches K1 and K2 connected to fuse 1, thereby stopping charging module 1 from charging the power battery. When charging module 1 stops charging the power battery, the charging pile controller can adjust the current of charging module 2. For example, the charging pile controller can control charging module 2 to output a current of 800A. Fuse 2 detects that the current passing through it is equal to its own rated current of 800A. Fuse 3' detects that the current passing through it is also equal to its own rated current of 800A, meeting the corresponding requirements. Therefore, charging module 2 can charge the power battery through DC ports DC1+ and DC1-. In addition, since the charging pile adjusts the current output by the charging module 2, the current output by the charging module 2 increases compared to the current output before the charging module 2 is adjusted, which is equivalent to increasing the charging power, thereby increasing the charging speed and improving the user experience.

[0166] In one embodiment, for the charging connection device, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging connection device 500 is used to send a message to the charging pile requesting to reduce the current output by the DC plug connected to the DC socket connected to the fuse.

[0167] For the charging pile, when the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed by the corresponding transmission line, the charging pile 400 is used to reduce the current output by a group of charging modules connected to the fuse.

[0168] Referring to (a) in FIG7 above, it is still assumed that the required charging current of the power battery is 1600A, the maximum current allowed for each group of transmission lines is 800A, and the fuse rated currents of fuses 1, 2, 3, and 3' are all 800A. When charging module 1 outputs a current of 900A and charging module 2 outputs a current of 700A, fuse 1 detects that the current passing through it is greater than its own fuse rated current of 800A. Fuse 1 can issue an abnormal signal. Upon receiving the abnormal signal, the charging pile controller can reduce the current output by charging module 1. For example, the charging pile can reduce the current output by charging module 1 to 800A to meet the safety requirements of the transmission line where fuse 1 is located. In addition, the charging pile can also adjust the charging module 2 to output a current of 800A. Since the current flowing through the fuse 2 is equal to its own fuse rated current, the fuse 2 will not melt, meeting the corresponding requirements. Moreover, after adjustment, the charging module 1 and the charging module 2 both output a current of 800A, which can meet the power requirements of the electric vehicle.

[0169] Under abnormal circumstances, the current output by the charging module may be greater than the rated current of the fuse connected in series with it. If the corresponding DC power supply circuit switch or charging circuit switch is not disconnected in time, causing the fuse to melt, the charging module will not be able to charge the power battery through the corresponding DC port.

[0170] For example, as described above, charging module 1 outputs a current of 900A, charging module 2 outputs a current of 700A, and fuse 1 detects that the current passing through it is greater than its own fuse rated current of 800A. The charging pile controller fails to disconnect the DC power supply circuit switches K1 and K2 in time, causing the fuse of fuse 1 to melt. As a result, charging module 1 cannot charge the power battery through the DC ports DC+ and DC-. In this case, the power distribution module in the charging pile can enable charging module 1 to charge the power battery through the DC ports DC1+ and DC1-, as shown in Figure 7 (c).

[0171] The power distribution module includes two input ports and two output ports. Under normal circumstances, charging module 1 charges the power battery through DC power ports DC+ and DC-, while charging module 2 charges the power battery through DC power ports DC1+ and DC1-. In abnormal circumstances, such as when fuse 1 melts, the power distribution module switches in the power distribution module are controlled to open and close, allowing charging module 1 to charge the power battery through DC power ports DC1+ and DC1-. Alternatively, if fuse 2 melts, the power distribution module switches in the power distribution module are controlled to open and close, allowing charging module 2 to charge the power battery through DC power ports DC+ and DC-.

[0172] Taking the melting of fuse 1 as an example, in some possible cases, charging module 2 only outputs a current of 400A, charging the power battery with a current of 400A, which is slow and reduces the user experience. If the rated current of the fuses of fuse 2 and fuse 3' are both 800A, the charging pile can realize the parallel connection of charging module 1 and charging module 2 by controlling the on and off state of the switch in the power distribution module, so that both charging module 1 and charging module 2 can charge the power battery through DC ports DC1+ and DC1-. When charging module 1 also outputs a current of 400A, the two groups of charging modules, charging module 1 and charging module 2, can charge the power battery with a current of 800A, which can not only meet the current requirements of the transmission line and the corresponding fuse, but also increase the charging power and charging speed, thereby improving the user experience.

[0173] It should be noted that in the embodiment of the present application, there is no conductive electrical connection between the output end of each set of charging modules and the vehicle's fuse. In other words, when all switches in the power distribution module are disconnected, that is, when the power distribution module does not perform the function of dispatching power, charging module 1 can only charge the power battery through the DC ports DC+ and DC-, and charging module 2 can only charge the power battery through the DC ports DC1+ and DC1-. This is because, if there is a conductive electrical connection between the output end of each set of charging modules and the front end of the vehicle-side fuse, the current output by charging module 1 and charging module 2 can charge the power battery through both the DC ports DC+ and DC-, and the DC ports DC1+ and DC1-. This charging method is consistent with the charging method in the embodiment shown in Figure 5 above, but there is still the possibility that the charging pile cannot be effectively protected when the charging interface is short-circuited, resulting in damage to the charging pile, as well as safety issues, which may endanger personal safety in serious cases. Therefore, in the embodiment of the present application, there is no conductive electrical connection between the output end of each set of charging modules and the vehicle's fuse.

[0174] As mentioned above, an EV can be connected to either a 2015 / 2015+ / Supercharger or an MCS charger. When connected to different chargers, the EV sends different messages depending on the charging circuit switch stickiness.

[0175] In one embodiment, the charging connection device 500 is used to: when the charging connection device is connected to a first charging gun, if the charging circuit switches connected to some DC sockets in multiple groups of DC sockets are stuck, send a message to the charging pile requesting that the DC plugs connected to some DC sockets stop outputting DC power.

[0176] In the embodiment of the present application, the first charging gun is an MCS charging gun. Referring to Figure 6 above, when an electric vehicle is connected to an MCS charging gun, the charging gun charges the power battery through two sets of DC ports: charging module 1 charges the power battery through DC ports DC+ and DC-, and charging module 2 charges the power battery through DC ports DC1+ and DC1-. If the charging circuit switches connected to some of the multiple sets of DC sockets become stuck, a message is sent to the charging pile requesting that the DC plugs connected to some of the DC sockets stop outputting DC power.

[0177] For example, when the charging circuit switches K5' and K6' connected to the DC sockets corresponding to the DC ports DC1+ and DC1- are stuck, the charging connection device can send a message to the charging pile to request that the DC plugs DC1+ and DC1- stop outputting DC power. After the charging pile receives the message, the charging module 2 stops outputting DC power. If the charging module 2 continues to output DC power, when the vehicle controller disconnects the charging circuit switches K5' and K6', the charging circuit switches K5' and K6' cannot be completely disconnected, causing the DC ports DC1+ and DC1- to be charged. The user may accidentally touch the DC ports DC1+ and DC1-, thereby causing personal injury. For the charging module 1, the charging module 1 can still output DC power, which charges the power battery through the DC ports DC+ and DC-.

[0178] For the charging pile, when the first charging gun is connected to the DC socket, if the DC power supply circuit switch connected to some of the DC plugs in the multiple groups of DC plugs is stuck, a group of charging modules connected to each group of DC plugs in the partial DC plugs is controlled to stop outputting DC power.

[0179] For example, when the DC power supply circuit switches K1' and K2' connected to the DC plugs corresponding to the DC ports DC1+ and DC1- are stuck, the charging pile controls the charging module 2 to stop outputting DC power. If the charging module 2 continues to output DC power, then when the charging pile controller disconnects the DC power supply circuit switches K1' and K2', the DC power supply circuit switches K1' and K2' cannot be completely disconnected, causing the DC ports DC1+ and DC1- to be charged. Users may accidentally touch the DC ports DC1+ and DC1-, causing personal injury. As for the charging module 1, the charging module 1 can still output DC power, which charges the power battery through the DC ports DC+ and DC-.

[0180] In one embodiment, the charging connection device 500 is used to: when the charging connection device is connected to a second charging gun, if the charging circuit switch connected to a group of DC sockets connected to the second charging gun is stuck, send a message to the charging pile to request to stop the DC plug connected to a group of DC sockets from outputting DC power.

[0181] In this embodiment, the second charging gun is any of the following: a 2015, 2015+, or Supercharge gun. When the electric vehicle is connected to a 2015 / 2015+ / Supercharge gun, the charging gun charges the power battery through a set of DC ports, i.e., charging module 1 charges the power battery through DC ports DC+ and DC-. If the charging circuit switch connected to a set of DC sockets becomes stuck, a message is sent to the charging pile requesting that the DC plug connected to the set of DC sockets stop outputting DC power.

[0182] For example, if the charging circuit switches K5 and K6 connected to the DC sockets corresponding to the DC ports DC+ and DC- are stuck, the charging connection device can send a message to the charging pile requesting that the DC plugs DC+ and DC- stop outputting DC power. Upon receiving this message, the charging pile stops outputting DC power. In this case, the charging pile stops charging the power battery. If the charging pile continues to output DC power, when the vehicle controller disconnects the charging circuit switches K5 and K6, they cannot be fully disconnected, causing the DC ports DC+ and DC- to be charged. Users may accidentally touch the DC ports DC+ and DC-, posing a personal injury.

[0183] For the charging pile, when the second charging gun is connected to the DC socket, if the DC power supply circuit switch connected to a group of DC plugs is stuck, a group of charging modules connected to the group of DC plugs will be controlled to stop outputting DC power.

[0184] For example, if the DC power supply circuit switches K1 and K2 connected to the DC plugs corresponding to the DC ports DC+ and DC- become stuck, the charging pile controls the charging module 1 to stop outputting DC power. In this case, the charging pile stops charging the power battery. If the charging pile continues to output DC power, when the charging pile controller disconnects the DC power supply circuit switches K1 and K2, they cannot be completely disconnected, causing the DC ports DC+ and DC- to be charged. Users may accidentally touch the DC ports DC+ and DC-, posing a personal injury.

[0185] The following will specifically introduce the basic charging safety requirements in different charging scenarios. Table 1 shows the basic charging safety requirements in different charging scenarios.

[0186] Table 1

[0187] Refer to Table 1. The MCS charging gun includes two sets of DC plugs, and the 2015 / 2015+ / Supercharger charging gun includes one set of DC plugs.

[0188] Figure 8 shows the MCS charging gun interface diagram. Referring to Figure 8 (a), DC+, DC-, DC1+, and DC1- are DC plugs, PE is the grounding plug, S+ and S- are charging communication plugs, CC1 and CC2 are charging connection confirmation plugs, and A+ and A- are low-voltage auxiliary power plugs.

[0189] Referring to Figure 8(b), compared to Figure 8(a), there's an additional CC3 connection confirmation plug. This CC3 is used to confirm whether the connected charging gun is an MCS gun or a 2015 / 2015+ / Supercharger gun. For details on this confirmation process, see Figure 20 below. The remaining plugs are identical to those in Figure 8(a) and will not be further described.

[0190] The upper end of the interface in the embodiment of the present application is the DC ports DC+ and DC- shown in (a) of Figure 8 and (b) of Figure 8; the lower end of the interface is the DC ports DC1+ and DC1- shown in (a) of Figure 8 and (b) of Figure 8.

[0191] Specifically, when the charging gun is not connected to the electric vehicle, measures to prevent electric shock can be taken. For example, referring to Figure 6 above, the vehicle controller can disconnect the charging circuit switches K5, K6 and the charging circuit switches K5', K6' to prevent the user from accidentally getting an electric shock when the DC ports DC+, DC- and DC1+, DC1- are energized, causing harm to the person. In particular, when the charging circuit switches K5, K6 or the charging circuit switches K5', K6' are stuck, the electric vehicle should take measures to avoid the DC ports DC+, DC- being energized or the DC ports DC1+, DC1- being energized, or, an alarm should be issued (such as a sound reminder or a light flashing reminder) to remind the user not to touch the DC ports DC+, DC- or the DC ports DC1+, DC1- to prevent the user from getting an electric shock.

[0192] When an electric vehicle is connected to a 2015 / 2015+ / supercharger, the charging station charges the power battery through the DC ports DC+ and DC-. If the upper end of the interface is stuck, it can be understood that the charging circuit switches K5 and K6 are stuck, and charging of the power battery should be prohibited. This is because when the charging circuit switches K5 and K6 are stuck, when the vehicle controller disconnects the charging circuit switches K5 and K6, the charging circuit switches K5 and K6 cannot be completely disconnected, resulting in the DC ports DC+ and DC- being charged. Users may accidentally touch the DC ports DC+ and DC-, causing personal injury. If the lower end of the interface is stuck, it can be understood that the charging circuit switches K5' and K6' are stuck, and charging of the power battery should also be prohibited. This is because the charging circuit switches K5' and K6' are stuck together. When they need to be disconnected, they cannot be completely disconnected, causing the DC ports DC1+ and DC1- to be charged. Users may accidentally touch these DC ports DC1+ and DC1-, causing personal injury. If both the upper and lower ends of the interface are stuck, for similar reasons, both sets of DC ports should be prohibited from charging the power battery.

[0193] If the electric vehicle is connected to an MCS charging gun, that is, the charging pile charges the power battery through the DC ports DC+, DC- and DC1+, DC1-. If the upper end of the interface is adhered, it can be understood that the charging circuit switches K5 and K6 are adhered, and then the charging should be done through the lower path, that is, the charging pile only charges the power battery through the DC ports DC1+ and DC1-. This is because, although the charging circuit switches K5 and K6 are adhered, since the charging circuit switches K5', K6' and the charging circuit switches K5 and K6 are independent of each other, the vehicle controller can still close the charging circuit switches K5', K6', and the charging pile can still charge the power battery through the DC ports DC1+ and DC1-. Similarly, if the lower end of the interface is adhered, it can be understood that the charging circuit switches K5' and K6' are adhered, then the charging should be done through the upper path, that is, the charging pile only charges the power battery through the DC ports DC+ and DC-. This is because, although the charging circuit switches K5' and K6' are stuck, since the charging circuit switches K5 and K6 and the charging circuit switches K5' and K6' are independent of each other, the vehicle controller can still close the charging circuit switches K5 and K6, and the charging pile can still charge the power battery through the DC ports DC+ and DC-. If both the upper and lower ends of the interface are stuck, then the charging circuit switches K5 and K6 and the charging circuit switches K5' and K6' are also stuck. For similar reasons, charging the power battery should be prohibited.

[0194] It should be noted that when the charging pile is charging the power battery through the DC ports DC+, DC- and DC1+, DC1-, that is, when the charging pile is charging the power battery through two charging circuits, if a fault occurs in one of the circuits, the contactor on the circuit should be disconnected, but it will not affect the charging pile from continuing to charge the power battery through the other circuit.

[0195] For example, when a charging pile is charging the power battery through DC ports DC+, DC- and DC1+, DC1-, if a fault occurs in the circuit used by charging module 1 to charge the power battery, the switches on that circuit should be disconnected. That is, the charging pile controller disconnects DC power supply circuit switches K1 and K2, and the vehicle controller disconnects charging circuit switches K5 and K6, causing charging module 1 to stop charging the power battery. However, charging module 2 can still charge the power battery through DC ports DC1+ and DC1-, ensuring continued charging of the power battery.

[0196] Similarly, when the charging pile is charging the power battery through DC ports DC+, DC- and DC1+, DC1-, if a fault occurs in the circuit used by charging module 2 to charge the power battery, the switches on that circuit should be disconnected. That is, the charging pile controller disconnects the DC power supply circuit switches K1' and K2', and the vehicle controller disconnects the charging circuit switches K5' and K6', causing charging module 2 to stop charging the power battery. However, charging module 1 can still charge the power battery through DC ports DC+ and DC-, ensuring continued charging of the power battery.

[0197] Furthermore, insulation testing of charging piles and electric vehicles is crucial for ensuring safe charging of electric vehicles. By performing insulation testing on charging piles and electric vehicles, it is possible to determine whether they present safety hazards such as leakage, thereby ensuring electrical safety for users and the surrounding environment.

[0198] Generally, before a charging station charges the power battery, both the charging station and the electric vehicle will perform a preliminary insulation test. Specifically, after the charging gun is plugged into the vehicle's socket, the charging station closes the DC power supply circuit switches K1 and K2. The charging station's insulation detection device performs a preliminary insulation test on the electrical circuit between the output of the charging module and the charging circuit switches K5 and K6. The insulation detection device in the electric vehicle also performs a preliminary insulation test on the electrical circuit between the charging circuit switches K5 and K6 and the power battery. Only after confirming that there is no leakage in both electrical circuits will the charging station begin charging the power battery. While the charging station is charging the power battery, the insulation detection device in the electric vehicle can perform an insulation test on the entire charging circuit from the output of the charging module to the power battery to detect any leakage during the charging process.

[0199] In one embodiment, the charging pile further includes a plurality of insulation detection devices, and the plurality of insulation detection devices correspond one-to-one to the plurality of charging modules.

[0200] Each insulation detection device is used to perform insulation detection on the circuit between the output terminals of a corresponding group of charging modules and the corresponding DC power supply circuit switch when the DC plug is connected to the DC socket.

[0201] As shown in Figures 9 to 11, multiple insulation monitoring devices (IMDs) are installed in the charging pile. Each IMD can independently perform insulation testing on the electrical circuit between the output of the corresponding charging module and the DC power supply circuit switch. The two input terminals of each IMD are connected to two power lines, and the output terminal of each IMD is connected to the equipment ground. Table 2 shows the insulation testing under different charging scenarios.

[0202] Table 2

[0203] Referring to Table 2, the MCS charging gun can be understood as charging the power battery through its two DC ports (i.e., DC+ and DC-, and DC1+ and DC1-). The 2015 / 2015+ / Supercharger charging gun can be understood as charging the power battery through its DC+ and DC- ports. The following describes the specific insulation testing process performed by the insulation testing device, depending on the specific situation.

[0204] Case 1: Vehicle interface connected to MCS charging gun

[0205] When charging the upper and lower circuits simultaneously, that is, charging module 1 and charging module 2 charge the power battery simultaneously, after the charging plug is plugged into the charging socket, the DC power supply circuit switches K1, K2 and K1', K2' are closed. IMD1 performs an insulation test on the circuit between the output end of charging module 1 and the charging circuit switches K5, K6, and IMD2 performs an insulation test on the circuit between the output end of charging module 2 and the charging circuit switches K5', K6'. After the insulation test is completed, IMD1 and IMD2 are separated from the circuit and connected to the discharge circuit to discharge the charging output voltage.

[0206] When charging is performed separately, that is, the charging module 2 charges the power battery through the DC ports DC1+ and DC1-. After the charging plug is plugged into the charging socket, the DC power supply circuit switches K1' and K2' are closed, and the IMD2 performs an insulation test on the circuit between the output end of the charging module 2 and the charging circuit switches K5' and K6'. After the insulation test is completed, the IMD2 is separated from the circuit and connected to the discharge circuit to discharge the charging output voltage.

[0207] When charging on the road alone, that is, the charging module 1 charges the power battery through the DC ports DC+ and DC-. After the charging plug is plugged into the charging socket, the DC power supply circuit switches K1 and K2 are closed, and the IMD1 performs an insulation test on the circuit between the output end of the charging module 1 and the charging circuit switches K5 and K6. After the insulation test is completed, the IMD1 is separated from the circuit and connected to the discharge circuit to discharge the charging output voltage.

[0208] Case 2: The vehicle interface is connected to a 2015 / 2015+ / Supercharger charging cable

[0209] In this case, you can refer to the relevant content about charging on the road alone, which will not be repeated here.

[0210] In summary, if the vehicle interface is connected to an MCS charging gun, when charging module 1 charges the power battery via DC ports DC+ and DC-, insulation testing can be performed on the circuit between the output of charging module 1 and the charging circuit switches K5 and K6 via IMD1. When charging module 2 charges the power battery via DC ports DC1+ and DC1-, insulation testing can be performed on the circuit between the output of charging module 2 and the charging circuit switches K5' and K6' via IMD2. When charging modules 1 and 2 charge the power battery simultaneously, insulation testing can be performed on the circuit between the output of the corresponding charging module and the charging circuit switches K5 and K6, respectively, via IMD1 and IMD2. If the vehicle interface is connected to a 2015 / 2015+ / supercharger charging gun, when charging module 1 charges the power battery via DC ports DC+ and DC-, insulation testing can be performed on the circuit between the output of charging module 1 and the charging circuit switches K5 and K6, via IMD1.

[0211] It should be noted that when the vehicle interface is connected to the MCS charging gun, when the charging pile charges the power battery normally through the upper and lower routes, that is, the charging pile charges the power battery normally through the DC ports DC+, DC- and DC1+, DC1-, the charging pile controller should perform insulation detection through the upper and lower routes respectively, that is, IMD1 performs insulation detection on the circuit between the output end of the charging module 1 and the charging circuit switches K5 and K6, and IMD2 performs insulation detection on the circuit between the output end of the charging module 2 and the charging circuit switches K5' and K6'.

[0212] If an abnormality occurs in one of the upper and lower circuits, the charging pile controller should stop charging the power battery through this circuit, and there is no need to perform insulation testing on this circuit. However, the charging pile can still charge the power battery through the other circuit, so an insulation test is required on the other circuit. For example, if an abnormality occurs in the circuit where the charging module 1 charges the power battery through the DC ports DC+ and DC-, the charging pile controller should disconnect the DC power supply circuit switches K1 and K2. Since the charging module 1 stops charging the power battery, the charging pile does not need to perform insulation testing on the circuit between the output end of the charging module 1 and the charging circuit switches K5 and K6. However, the charging module 2 can charge the power battery through the DC ports DC1+ and DC1-, so the charging pile controller should perform insulation testing on the circuit between the output end of the charging module 2 and the charging circuit switches K5' and K6', that is, the charging pile controller controls IMD2 to perform insulation testing on the circuit between the output end of the charging module 2 and the charging circuit switches K5' and K6'.

[0213] It should also be noted that when the charging pile can charge the power battery normally through the upper and lower routes, the charging pile controller should perform insulation tests on the upper and lower routes respectively at different times to avoid conflicts caused by simultaneous insulation tests on the upper and lower routes.

[0214] In the embodiment of the present application, since the multiple insulation detection devices in the charging pile correspond one-to-one to the multiple groups of charging modules, for the working condition of any charging module charging the power battery, each insulation detection device can realize the insulation detection of the circuit between the output end of the corresponding charging module and the corresponding charging circuit switch of the electric vehicle, so as to determine whether each group of charging modules in the charging pile and its related ones have safety hazards such as leakage, thereby ensuring the electrical safety of users and the surrounding environment.

[0215] Insulation testing for electric vehicles is related to the circuitry installed in the vehicle. In some scenarios, an isolated DC-DC circuit is installed between the power battery and the charging socket. In one embodiment, the charging connection device 500 also includes at least one isolated DC-DC circuit and at least one insulation detection device. The at least one isolated DC-DC circuit corresponds to the at least one insulation detection device, and each isolated DC-DC circuit is connected in series between the charging circuit switch and the power battery.

[0216] Each insulation detection device is used to perform insulation detection on the circuit between the corresponding isolated DC-DC circuit and the output end of the charging module connected to the corresponding DC plug during the charging process of the electric vehicle.

[0217] In the embodiment of the present application, the charging connection device 500 further includes at least one isolated DC-DC circuit and at least one insulation detection device. The following describes the specific process of performing insulation detection when the charging connection device 500 includes one isolated DC-DC circuit and multiple isolated DC-DC circuits.

[0218] Case 1: An isolated DC-DC circuit is connected in series between each charging circuit switch and the power battery

[0219] 12 , it can be seen that an isolated DC-DC circuit is connected in series between the charging circuit switches K5 and K6 and the power battery, and an isolated DC-DC circuit is connected in series between the charging circuit switches K5 ′ and K6 ′ and the power battery.

[0220] Because an isolated DC-DC circuit is connected in series between each charging circuit switch and the power battery, the circuit between the power battery and the isolated DC-DC circuit is electrically isolated from the circuit between the isolated DC-DC circuit and the DC outlet. Therefore, while the charging module is charging the power battery, the electric vehicle's existing IMD0 can only perform insulation testing on the circuit from the power battery to the isolated DC-DC circuit. In this case, a new IMD is needed to perform insulation testing on the circuit from the charging module output to the isolated DC-DC circuit to determine whether the tested circuit has safety hazards such as leakage, thereby ensuring the electrical safety of users and the surrounding environment.

[0221] For example, IMD3 and IMD4 are newly added in FIG12 , wherein IMD3 can perform insulation detection on the circuit between the output end of the charging module 1 and the isolated DC-DC circuit during the power battery charging process, and IMD4 can perform insulation detection on the circuit between the output end of the charging module 2 and the isolated DC-DC circuit during the power battery charging process.

[0222] In some possible embodiments, an isolated DC-DC circuit is connected in series between the node after the two sets of charging circuit switches are connected in parallel and the power battery, which is equivalent to connecting an isolated DC-DC circuit in series between each set of charging circuit switches and the power battery. In this case, it is still necessary to add an IMD dedicated to insulation detection of the circuit between the output end of the charging module and the isolated DC-DC circuit.

[0223] For example, IMD3 and IMD4 are newly added in FIG13 , wherein the functions of IMD3 and IMD4 are similar to those in FIG12 above.

[0224] For another example, IMD5 is newly added in FIG14 , and the IMD5 can perform insulation detection on two circuits, including the circuit between the output end of the charging module 1 and the isolated DC-DC circuit and the circuit between the output end of the charging module 2 and the isolated DC-DC circuit.

[0225] Case 2: An isolated DC-DC circuit is connected in series between one set of charging circuit switches and the power battery

[0226] As shown in Figures 15 and 16, an isolated DC-DC circuit is connected in series between one set of charging circuit switches and the power battery, and a non-isolated DC-DC circuit is connected in series between the other set of charging circuit switches and the power battery.

[0227] Refer to Figure 15, which shows a non-isolated DC-DC circuit connected in series between the charging circuit switches K5 and K6 and the power battery, and an isolated DC-DC circuit connected in series between the charging circuit switches K5' and K6' and the power battery. Refer to Figure 16, which shows an isolated DC-DC circuit connected in series between the charging circuit switches K5 and K6 and the power battery, and a non-isolated DC-DC circuit connected in series between the charging circuit switches K5' and K6' and the power battery.

[0228] Since a non-isolated DC-DC circuit and an isolated DC-DC circuit are set between the charging circuit switch and the power battery, there is no need to add an IMD for the circuit with the non-isolated DC-DC circuit; however, an IMD needs to be added for the charging circuit with the isolated DC-DC circuit.

[0229] For example, as shown in Figure 15 , since a non-isolated DC-DC circuit is connected in series between the charging circuit switches K5 and K6 and the power battery, based on similar analysis as described above, there's no need for a dedicated IMD in the charging circuit specifically designed to perform insulation testing on the circuit between the charging module's output and the non-isolated DC-DC circuit. During the power battery charging process, the power battery's own IMD can perform insulation testing on the circuit between the charging module's output and the power battery. Since an isolated DC-DC circuit is connected in series between the charging circuit switches K5' and K6' and the power battery, based on similar analysis as described above, a new IMD, such as IMD6, is required in the charging circuit. During the power battery charging process, IMD6 is dedicated to performing insulation testing on the circuit between the charging module 2's output and the isolated DC-DC circuit, while IMD0 performs insulation testing on the circuit between the isolated DC-DC circuit and the power battery.

[0230] For another example, as shown in Figure 16, since an isolated DC-DC circuit is connected in series between the charging circuit switches K5 and K6 and the power battery, based on similar analysis as above, a new IMD is required in this charging circuit, such as IMD7 shown in the figure. During the power battery charging process, IMD7 is specifically responsible for performing insulation testing on the circuit between the output of charging module 1 and the isolated DC-DC circuit, while IMD0 performs insulation testing on the circuit between the isolated DC-DC circuit and the power battery. Since a non-isolated DC-DC circuit is connected in series between the charging circuit switches K5' and K6' and the power battery, based on similar analysis as above, a new IMD dedicated to performing insulation testing on the circuit between the output of the charging module and the non-isolated DC-DC circuit is not required in this charging circuit. During the power battery charging process, the power battery's own IMD can perform insulation testing on the circuit between the output of the charging module and the power battery.

[0231] Case 3: A non-isolated DC-DC circuit is connected in series between each charging circuit switch and the power battery

[0232] Referring to Figure 10 above, a non-isolated DC-DC circuit is shown connected in series between each set of charging circuit switches and the power battery. Referring to Figure 11 above, only one non-isolated DC-DC circuit is provided, and this non-isolated DC-DC circuit is placed between the node where the two sets of charging circuit switches are connected in parallel and the power battery, equivalent to a non-isolated DC-DC circuit being connected in series between each set of charging circuit switches and the power battery.

[0233] Because a non-isolated DC-DC circuit is connected in series between the charging circuit switch and the power battery, there is no electrical isolation between the power battery and the non-isolated DC-DC circuit, and the non-isolated DC-DC circuit and the DC outlet. Therefore, while the charger is charging the power battery, the electric vehicle's existing IMD0 can perform insulation testing on the circuit between the power battery and the output terminals of the charging module. In other words, based on this design approach, there is no need for a new IMD dedicated to insulation testing on the circuit between the output terminals of the charging module and the non-isolated DC-DC circuit.

[0234] In some embodiments, during the process of charging the power battery by the charging pile, the pile end insulation detection device in the charging pile can also perform insulation detection on the entire charging circuit from the output end of the charging module to the power battery to confirm whether there is leakage during the charging process of the power battery.

[0235] Specifically, the electric vehicle can send a message in advance to the charging pile to inform it of the status of its own isolated DC-DC circuit or non-isolated DC-DC circuit. After receiving the message, the charging pile can perform insulation detection based on the status of the electric vehicle's isolated DC-DC circuit or non-isolated DC-DC circuit included in the message.

[0236] Taking Figure 15 as an example, an electric vehicle sends a message to a charging station. This message includes information about a non-isolated DC-DC circuit between the charging circuit switches K5 and K6 and the power battery, and an isolated DC-DC circuit between the charging circuit switches K5' and K6' and the power battery. After the charging station receives this message, during the charging process, IMD1 can perform insulation testing on the entire charging circuit from the output of charging module 1 to the power battery, because the non-isolated DC-DC circuit is installed between the charging circuit switches K5 and K6 and the power battery. Since an isolated DC-DC circuit is installed between the charging circuit switches K5' and K6' and the power battery, IMD2 can perform insulation testing on the circuit from the output of charging module 2 to the isolated DC-DC circuit. As for the circuit from the isolated DC-DC circuit to the power battery, the circuit still needs to be tested by the vehicle-side insulation testing device in the electric vehicle. Specifically, IMD0 in the power battery performs insulation testing on the circuit from the isolated DC-DC circuit to the power battery.

[0237] In one embodiment, a charging station or electric vehicle can be equipped with only one IMD, which can be switched to any charging circuit, thereby performing insulation testing on the entire charging circuit from any charging module to the power battery, or on a portion of the circuit. The following example uses an IMD performing insulation testing on the entire charging circuit from the charging module to the power battery.

[0238] Referring to Figure 17, it can be seen that IMD1' is provided in the charging pile. IMD1' can be switched to the charging circuit where charging module 1 is located. Therefore, IMD1' can perform insulation testing on the entire charging circuit from charging module 1 to the power battery during charging. IMD1' can also be switched to the charging circuit where charging module 2 is located. Therefore, IMD1' can perform insulation testing on the entire charging circuit from charging module 2 to the power battery during charging.

[0239] The electric vehicle is equipped with an IMD2', which can be switched to the charging circuit where the charging circuit switches K5 and K6 are located. This allows IMD2' to perform insulation testing on the entire charging circuit from the charging module 2 to the power battery during charging. The IMD2' can be switched to the charging circuit where the charging circuit switches K5 and K6 are located. This allows IMD2' to perform insulation testing on the entire charging circuit from the charging module 2 to the power battery during charging.

[0240] The difference between the embodiment of the present application and the embodiment shown in FIG9 is that the embodiment of the present application can only perform insulation testing on the entire charging circuit from one charging module to the power battery at a time. For example, when charging module 1 charges the power battery through DC ports DC+ and DC-, the IMD1' can be switched to the charging circuit where charging module 1 is located, so that insulation testing on the entire charging circuit from charging module 1 to the power battery can be performed through the IMD1'. When charging module 2 charges the power battery through DC ports DC1+ and DC1-, the IMD1' can be switched to the charging circuit where charging module 2 is located, so that insulation testing on the entire charging circuit from charging module 2 to the power battery can be performed through the IMD1'.

[0241] The difference between the embodiment of the present application and the embodiment shown in FIG12 is that the embodiment of the present application can only perform insulation testing on the entire charging circuit from one charging module to the power battery at a time. For example, when charging module 1 charges the power battery through DC ports DC+ and DC-, the IMD2' can be switched to the charging circuit that charges the power battery through DC ports DC+ and DC-, thereby performing insulation testing on the entire charging circuit from charging module 1 to the power battery through the IMD2'. When charging module 2 charges the power battery through DC ports DC1+ and DC1-, the IMD can be switched to the charging circuit that charges the power battery through DC ports DC1+ and DC1-, thereby performing insulation testing on the entire charging circuit from charging module 2 to the power battery through the IMD2'.

[0242] The embodiments of the present application can independently perform insulation testing on the entire charging circuit from each charging module to the power battery, or on a portion of the circuit. This allows for determining whether the circuit from each charging module in the charging pile to the power battery has safety hazards such as leakage, thereby ensuring the electrical safety of users and the surrounding environment. Furthermore, since only one IMD is required to perform insulation testing on the entire charging circuit from each charging module to the power battery, or on a portion of the circuit, this facilitates integration and reduces costs.

[0243] As shown in Figure 18, it is a schematic diagram of the structure of the charging system provided in an embodiment of the present application. Among them, Figure 18 (a) corresponds to Figure 8 (a) above, and Figure 18 (b) corresponds to Figure 8 (b) above. Among them, DC+, DC- and DC1+, DC1- are DC ports, PE is the ground port, S+ and S- are charging communication ports, CC1 and CC2 are charging connection confirmation ports, CC3 is a connection confirmation port, and A+ and A- are low-voltage auxiliary power ports.

[0244] Referring to (a) in Figure 18, the charging interface in the embodiment of the present application is compared with the charging interface of 2015, 2015+, and super charging. The charging interface in the embodiment of the present application has an additional set of DC ports DC1+ and DC1-. The other ports are basically the same as those of 2015, 2015+, and super charging. For details, please refer to the relevant content of 2015, 2015+, and super charging.

[0245] Referring to (b) in Figure 18, compared with (a) in Figure 18, (b) in Figure 18 has an additional connection confirmation port CC3, which is used to confirm the type of charging gun connected to the vehicle socket. The other ports are the same as (a) in Figure 18.

[0246] In one embodiment, the charging connection device 500 is used to: confirm that the charging connection device is connected to a first charging gun or a second charging gun, the first charging gun includes multiple sets of DC plugs, and the second charging gun includes one set of DC plugs.

[0247] When the charging connection device is confirmed to be connected to the first charging gun, the message sent to the charging pile includes information indicating that the multiple sets of DC plugs output the same current. When the charging connection device is confirmed to be connected to the second charging gun, the message sent to the charging pile includes information indicating the current output by the set of DC plugs.

[0248] In an embodiment of the present application, the charging connection device can send different messages to the charging pile based on the type of charging gun it confirms it is connected to. Specifically, when the charging connection device confirms that it is connected to an MCS charging gun, multiple sets of DC sockets are connected to multiple sets of DC plugs, such as the DC sockets DC+ and DC- connected to the DC plugs DC+ and DC-, and the DC sockets DC1+ and DC1- connected to the DC plugs DC1+ and DC1-, as shown in Figure 18 (a) or Figure 18 (b). As a result, the message sent by the charging connection device to the charging pile includes information indicating that the two sets of DC plugs output the same current, that is, the DC plugs DC+ and DC- and the DC plugs DC1+ and DC1- output the same current.

[0249] When the charging connection device confirms that it is connected to a 2015 / 2015+ / supercharger charging gun, one group of DC sockets in the multiple groups of DC sockets is connected to the corresponding DC plugs, such as the DC sockets DC+ and DC- connected to the DC plugs DC+ and DC- as shown in (a) or (b) of Figure 18, so that the message sent by the charging connection device to the charging pile includes information for indicating the current output by this group of DC plugs, that is, information on the current output by the DC plugs DC+ and DC-.

[0250] In an embodiment of the present application, the charging connection device can send different messages to the charging pile based on the type of charging gun it is connected to. Specifically, when the charging gun identified by the charging connection device is an MCS charging gun, the message sent by the charging connection device to the charging pile includes information for indicating that multiple groups of DC plugs output the same current; when the charging connection device identifies that the charging gun is a 2015 / 2015+ / supercharger charging gun, the message sent by the charging connection device to the charging pile includes information for indicating the current output by a group of DC plugs. This avoids the situation where the current information included in the message sent by the charging connection device to the charging pile does not match the actual connection status of the DC plug and DC socket, which may cause the charging connection device to need to send the message again. This embodiment of the present application is conducive to quickly confirming the charging parameters between the charging connection device and the charging pile, thereby facilitating the power battery to quickly enter the charging stage. In addition, when the charging gun identified by the charging connection device is an MCS charging gun, the message sent by the charging connection device to the charging pile includes information for instructing multiple groups of DC plugs to output the same current. On the one hand, it can increase the charging power and speed, and it can also solve the problem of uneven transmission current of the two transmission lines and the resulting uneven contact resistance.

[0251] In the embodiment of the present application, the charging connection device can identify whether the charging gun it is connected to is a 2015 / 2015+ / super charging gun or an MCS charging gun in a variety of ways, as detailed below.

[0252] Method 1: Identify through CC2 port

[0253] In one embodiment, the charging connection device further includes a first connection confirmation socket and a first connection confirmation circuit, wherein the first connection confirmation socket is connected to the first connection confirmation circuit. When the charging connection device is connected to a charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the charging gun.

[0254] The charging connection device is used to: when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a first preset value, confirm that the electric vehicle is connected to the first charging gun; or when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a second preset value, confirm that the electric vehicle is connected to the second charging gun, wherein the first preset value is different from the second preset value.

[0255] In the embodiment of the present application, the first connection confirmation socket is the socket CC2, and the first connection confirmation plug is the plug CC2. When the charging connection device is connected to the charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket CC2 and the first connection confirmation plug CC2 of the charging gun.

[0256] When the first connection confirmation circuit of the charging connection device forms a current loop with the first connection confirmation circuit of the charging pile, the charging connection device can confirm whether the electric vehicle is connected to an MCS charging gun or a 2015 / 2015+ / supercharger charging gun based on the voltage at the detection point in its own first connection confirmation circuit. Specifically, when the voltage at the detection point in the first connection confirmation circuit of the charging connection device reaches a first preset value, it is confirmed that the electric vehicle is connected to an MCS charging gun; when the voltage at the detection point in the first connection confirmation circuit of the charging connection device reaches a second preset value, it is confirmed that the electric vehicle is connected to a 2015 / 2015+ / supercharger charging gun. This can improve the accuracy of the charging connection device in confirming the charging gun, and facilitate the charging connection device to send different messages to the charging pile based on the type of charging gun it is connected to.

[0257] In addition, the embodiment of the present application confirms whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage of the detection point in the first connection confirmation circuit. The first connection confirmation circuit can be a connection confirmation circuit connected to the existing connection confirmation socket CC2, that is, the type of charging gun can be confirmed by using the existing connection confirmation circuit, which is simple and reliable to implement.

[0258] In one embodiment, as shown in FIG19 , the first connection confirmation circuit of the charging connection device includes a first resistor unit, the first connection confirmation socket is connected to the voltage source via the first resistor unit, and the detection point is located between the first connection confirmation socket and the first resistor unit.

[0259] Referring to (a) in Figure 19, the first resistance unit in the embodiment of the present application is resistor R5, the voltage source is U2, and the detection point is detection point 2 shown in the figure. Before the vehicle socket is not connected to the charging gun, the voltage at detection point 2 should be the voltage output by the voltage source U2. Only when the vehicle socket is connected to the charging gun, the voltage source U2 forms a loop through the resistor R5 in the electric vehicle, the resistor R3 in the charging pile, and the ground wire in the charging pile. Because of the voltage divider function of the resistor, the voltage at detection point 2 will be the preset value. Moreover, the vehicle socket is connected to different types of charging guns, and the resistance value corresponding to R3 is different.

[0260] For example, the output voltage of the voltage source U2 is set to 12V, the resistance of R5 is 1Ω, the resistance of R3 corresponding to the 2015 / 2015+ / supercharge charging gun is 1Ω, and the resistance of R3 corresponding to the MCS charging gun is 0.2Ω.

[0261] In this design, when the voltage at detection point 2 is 6V, the charging connection device can confirm that it is connected to a 2015 / 2015+ / supercharger. When the voltage at detection point 2 is 2V, the vehicle charging connection device can confirm that it is connected to an MCS charging gun.

[0262] The identification principle shown in (b) of Figure 19 is similar to that of (a) of Figure 19. The charging connection device confirms whether it is connected to a 2015 / 2015+ / super charging gun or an MCS charging gun based on the voltage at detection point 2.

[0263] The identification principle shown in Figure 19(c) is similar to that of Figure 19(a) and will not be further described here. The difference between Figure 19(c) and Figure 19(a) is that the charging connection device determines whether it is connected to a 2015 / 2015+ / Supercharger or an MCS charging gun based on the voltage at detection point 2 in Figure 19(a), while the charging connection device determines whether it is connected to a 2015 / 2015+ / Supercharger or an MCS charging gun based on the voltage at detection point 3 in Figure 19(c).

[0264] In the embodiment of the present application, the voltage at the detection point in the first connection confirmation circuit of the charging connection device may have other functions in addition to being used to confirm the type of charging gun connected to the electric vehicle.

[0265] In one embodiment, the charging connection device 500 is further used to: confirm that the charging connection device is successfully connected to the first charging gun when the voltage at the detection point is a first preset value; and confirm that the charging connection device is successfully connected to the second charging gun when the voltage at the detection point is a second preset value.

[0266] In the embodiment of the present application, referring to (a) in the above FIG19 , the voltage output by the voltage source U2 is still set to 12V, the resistance of R5 is 1Ω, the resistance of R3 corresponding to the 2015 / 2015+ / super charging gun is 1Ω, and the resistance of R3 corresponding to the MCS charging gun is 0.2Ω.

[0267] When the voltage at test point 2 is 6V, the charging connection device can confirm that it is successfully connected to the 2015 / 2015+ / supercharger charging gun. When the voltage at test point 2 is 2V, the vehicle charging connection device can confirm that it is successfully connected to the MCS charging gun.

[0268] Referring to (b) in FIG. 19 , the charging connection device can confirm that it is successfully connected to a 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 2. Alternatively, the charging connection device can also confirm that it is successfully connected to a 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 2 and the voltage at detection point 3.

[0269] Referring to (c) in FIG. 19 , the charging connection device can confirm that it is successfully connected to a 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 3. Alternatively, the charging connection device can also confirm that it is successfully connected to a 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 3 and the voltage at detection point 2.

[0270] In an embodiment of the present application, when the voltage at the detection point is a first preset value, the charging connection device confirms that it is successfully connected to the first charging gun; when the voltage at the detection point is a second preset value, the charging connection device confirms that it is successfully connected to the second charging gun; this can improve the accuracy of the charging connection device in confirming the connection to the first charging gun or the second charging gun, which is beneficial for the charging connection device to send different messages to the charging pile according to the type of charging gun it is connected to.

[0271] In addition, the embodiment of the present application confirms whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage of the detection point in the first connection confirmation circuit. The first connection confirmation circuit can be a connection confirmation circuit connected to the existing connection confirmation socket CC2, that is, the type of charging gun can be confirmed by using the existing connection confirmation circuit, which is simple and reliable to implement.

[0272] Method 2: Identify through the newly added CC3 port

[0273] In one embodiment, the charging connection device further includes a first connection confirmation socket, a second connection confirmation socket, a first connection confirmation circuit, and a second connection confirmation circuit. The first connection confirmation socket is connected to the first connection confirmation circuit, and the second connection confirmation socket is connected to the second connection confirmation circuit.

[0274] When the charging connection device is connected to the first charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the first charging gun, and the second connection confirmation circuit forms a current loop with the second connection confirmation circuit of the charging pile through the second connection confirmation socket and the second connection confirmation plug of the first charging gun.

[0275] When the charging connection device is connected to the second charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the second charging gun, and the second connection confirmation socket is not connected to the plug of the second charging gun.

[0276] The charging connection device is further used to: when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is a third preset value, confirm that the charging connection device is connected to the first charging gun; or when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is a fourth preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a fifth preset value, confirm that the charging connection device is connected to the second charging gun, wherein the third preset value is different from the fourth preset value.

[0277] In the embodiments of the present application, the first connection confirmation socket and the second connection confirmation socket are respectively socket CC2 and socket CC3, and the first connection confirmation plug and the second connection confirmation socket are respectively plug CC2 and plug CC3. When the charging connection device is connected to a charging gun, the first connection confirmation circuit of the charging connection device forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket CC2 and the first connection confirmation plug CC2 of the charging gun. The second connection confirmation circuit of the charging connection device is related to the type of charging gun to which it is connected.

[0278] Specifically, when the charging connection device is connected to an MCS charging gun, the charging connection device's second connection confirmation circuit forms a current loop with the charging pile's second connection confirmation circuit via the second connection confirmation socket CC3 and the first charging gun's second connection confirmation plug CC3. When the charging connection device is connected to a 2015 / 2015+ / supercharger charging gun, the second connection confirmation socket is not connected to the second charging gun's plug.

[0279] Because the second connection confirmation circuit of the charging connection device forms or does not form a current loop with the second connection confirmation circuit of the charging pile when the charging connection device is connected to different types of charging guns, the charging connection device can confirm whether the electric vehicle is connected to an MCS charging gun or a 2015 / 2015+ / supercharger charging gun based on the voltage at the detection point in the second connection confirmation circuit of the charging connection device. Specifically, when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is the third preset value, it is confirmed that the electric vehicle is connected to an MCS charging gun; when the voltage at the detection point in the second connection confirmation circuit of the charging connection device is the fourth preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is the fifth preset value, it is confirmed that the electric vehicle is connected to a 2015 / 2015+ / supercharger charging gun. This can improve the accuracy of the charging connection device in confirming the type of charging gun, which is beneficial for the charging connection device to send different messages to the charging pile based on the type of charging gun it is connected to.

[0280] In one embodiment, as shown in FIG20 , the first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket is connected to the voltage source via the first resistor unit. The second connection confirmation circuit of the charging connection device includes a second resistor unit, and the second connection confirmation socket is connected to the voltage source via the second resistor unit.

[0281] The detection point in the first connection confirmation circuit of the charging connection device is located between the first connection confirmation socket and the first resistance unit, and the detection point in the second connection confirmation circuit of the charging connection device is located between the second connection confirmation socket and the second resistance unit.

[0282] Referring to FIG. 20( a ), in the embodiment of the present application, the first resistor unit is resistor R5, the voltage source is U2, and the detection point in the first connection confirmation circuit of the charging connection device is detection point 2 shown in the figure. The second resistor unit is resistor R7, and the detection point in the second connection confirmation circuit of the charging connection device is detection point 4 shown in the figure.

[0283] Before the vehicle socket is connected to the charging gun, the voltage at detection point 4 should be the voltage output by voltage source U2. When the vehicle socket is connected to the charging gun, voltage source U2 forms a loop through resistor R5 in the electric vehicle, resistor R3 in the charging pile, and the ground wire in the charging pile. Voltage source U2 may or may not form a loop through resistor R7 in the electric vehicle, resistor R6 in the charging pile, and the ground wire in the charging pile. Furthermore, the 2015 / 2015+ / supercharger charging gun corresponds to a situation where no loop is formed, which can be understood as the electric vehicle lacking a control and guidance circuit with resistor R6. The MCS charging gun corresponds to a situation where a loop is formed, which can be understood as the electric vehicle having a control and guidance circuit with resistor R6. Therefore, if the vehicle socket is connected to a 2015 / 2015+ / supercharger charging gun, the voltage at detection point 4 should be the voltage output by voltage source U2; if the vehicle socket is connected to an MCS charging gun, the voltage at detection point 4 should be the preset value.

[0284] If the vehicle socket is connected to a 2015 / 2015+ / supercharger, the voltage at test point 4 is the voltage output by voltage source 2 before and after the charger is plugged into the vehicle socket. In this case, the voltage at test point 2 can be combined for confirmation.

[0285] For example, assume that the output voltage of voltage source U2 is 12V, and the resistance values ​​of R7, R6, R5, and R3 are all 1Ω. With this design, when the voltage at test point 4 is 6V, the charging connection device confirms that it is connected to an MCS charging cable. When the voltage at test point 4 is 12V and the voltage at test point 2 is 6V, the charging connection device confirms that it is connected to a 2015 / 2015+ / Supercharger charging cable.

[0286] The identification principle shown in (b) of Figure 20 is similar to that of (a) of Figure 20. The charging connection device confirms whether it is connected to a 2015 / 2015+ / super charging gun or an MCS charging gun based on the voltage of detection point 4 and detection point 2.

[0287] The recognition principle shown in (c) of FIG. 20 is similar to that shown in (a) of FIG. 20 and will not be repeated here.

[0288] In an embodiment of the present application, the first connection confirmation circuit of the charging connection device includes a first resistor unit, through which the first connection confirmation socket is connected to a voltage source. This first connection confirmation circuit is a conventional connection confirmation circuit for vehicle socket connections. The second connection confirmation circuit of the charging connection device includes a second resistor unit, through which the second connection confirmation socket is connected to a voltage source. This second connection confirmation circuit is a newly designed circuit that only requires a single resistor unit to confirm the type of charging gun. This second connection confirmation circuit is simple in design and low in cost.

[0289] In the embodiment of the present application, the voltage at the detection point in the first connection confirmation circuit of the charging connection device may have other functions in addition to being used to confirm the type of charging gun connected to the electric vehicle.

[0290] In one embodiment, the charging connection device 500 is further configured to: confirm that the charging connection device is successfully connected to the first charging gun or the second charging gun when the voltage at a detection point in the first connection confirmation circuit of the charging connection device is a fifth preset value.

[0291] In the embodiment of the present application, referring to (a) in the above FIG. 20 , the voltage output by the voltage source U2 is still set to 12V, and the resistance value of R5 is still set to 1Ω.

[0292] When the voltage at detection point 2 is 6V, the charging connection device can confirm that it is successfully connected to the 2015 / 2015+ / supercharger charging gun, or confirm that it is successfully connected to the MCS charging gun.

[0293] Referring to (b) in FIG. 20 , the charging connection device can confirm that it is successfully connected to a 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 2. Alternatively, the charging connection device can also confirm that it is successfully connected to a 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 2 and the voltage at detection point 3.

[0294] Referring to (c) in FIG. 20 , the charging connection device can confirm that it is successfully connected to a 2015 / 2015+ / supercharger or MCS charging gun based on the voltage at detection point 2. Alternatively, the charging connection device can also confirm that it is successfully connected to a 2015 / 2015+ / supercharger or MCS charging gun based on the voltage at detection point 2 and the voltage at detection point 3.

[0295] In an embodiment of the present application, when the voltage at the detection point in the first connection confirmation circuit is the fifth preset value, the charging connection device confirms that it is successfully connected to the first charging gun or the second charging gun, that is, the charging connection device can still use the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple and reliable to implement.

[0296] For the charging pile, the charging pile can confirm whether the charging gun is successfully connected to the electric vehicle based on the voltage of the detection point in the corresponding connection confirmation circuit.

[0297] In one embodiment, the charging gun further includes a first connection confirmation plug, a second connection confirmation plug, a third connection confirmation plug, a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit, the first connection confirmation plug is connected to the first connection confirmation circuit, the second connection confirmation plug is connected to the second connection confirmation circuit, and the third connection confirmation plug is connected to the third connection confirmation circuit.

[0298] When the charging gun is connected to the electric vehicle, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the electric vehicle through the first connection confirmation plug and the first connection confirmation socket of the electric vehicle, the second connection confirmation circuit forms a current loop with the second connection confirmation circuit of the electric vehicle through the second connection confirmation plug and the second connection confirmation socket of the electric vehicle, and the third connection confirmation circuit forms a current loop with the third connection confirmation circuit of the electric vehicle through the third connection confirmation plug and the third connection confirmation socket of the electric vehicle.

[0299] The charging pile is used to: when the voltage of the detection point in the third connection confirmation circuit of the charging gun is a ninth preset value, confirm that the charging gun is successfully connected to the electric vehicle.

[0300] The charging gun in the embodiment of the present application is an MCS charging gun, and the first connection confirmation plug, the second connection confirmation plug, and the third connection confirmation plug are respectively plug CC2, plug CC3, and plug CC1. When the MCS charging gun is connected to an electric vehicle, each connection confirmation circuit in the charging gun forms a current loop with the corresponding connection confirmation plug and the connection confirmation socket and the corresponding connection confirmation circuit in the electric vehicle.

[0301] In an embodiment of the present application, since when the MCS charging gun is connected to the electric vehicle, the third connection confirmation circuit in the charging gun forms a current loop with the third connection confirmation circuit in the electric vehicle through the third connection confirmation plug and the third connection confirmation socket, therefore, when the voltage of the detection point in the third connection confirmation circuit of the charging gun is the ninth preset value, the charging pile can confirm that the MCS charging gun is successfully connected to the electric vehicle.

[0302] In the embodiment of the present application, when the charging gun includes multiple sets of DC plugs and three connection confirmation plugs, when the voltage of the detection point in the third connection confirmation circuit of the charging gun is the ninth preset value, the charging pile confirms that the charging gun is successfully connected to the electric vehicle. The third connection confirmation circuit in the embodiment of the present application is a connection confirmation circuit connected to the CC1 plug, that is, the electric vehicle still uses the connection confirmation circuit connected to the existing connection confirmation plug to confirm that it is successfully connected to the charging gun, which is simple to implement.

[0303] In one embodiment, the first connection confirmation circuit of the charging pile includes a fifth resistor unit, through which the first connection confirmation plug is connected to the device ground platform of the charging pile. The second connection confirmation circuit of the charging pile includes a sixth resistor unit, through which the second connection confirmation plug is connected to the device ground platform. The third connection confirmation circuit of the charging pile includes a seventh resistor unit, through which the third connection confirmation plug is connected to the voltage source, and the detection point is located between the third connection confirmation plug and the seventh resistor unit.

[0304] Taking Figure 20(a) as an example, in this embodiment, the fifth resistor unit is resistor R3, the sixth resistor unit is resistor R6, the seventh resistor unit is resistor R1, and the voltage source is U1. Assuming the output voltage of voltage source U1 is 12V, and the resistance values ​​of R1 and R4 are both 1Ω, the detection point in the charging gun's third connection confirmation circuit is detection point 1.

[0305] In this embodiment of the present application, before the charging gun is connected to the electric vehicle, the voltage at detection point 1 should be the voltage output by voltage source U1, that is, 12 V. When the charging gun is connected to the electric vehicle, voltage source U1 forms a loop through resistor R1 in the charging pile, resistor R4 in the electric vehicle, and the ground wire in the electric vehicle. Therefore, when the voltage at detection point 1 is 6 V, the charging pile can confirm that the MCS charging gun is successfully connected to the electric vehicle.

[0306] In this embodiment of the present application, when the charging pile is connected to the electric vehicle, the third connection confirmation circuit of the charging pile forms a loop with the third connection confirmation circuit of the charging connection device. Because the detection point is located between the third connection confirmation plug and the seventh resistor unit, the charging pile can confirm that the charging gun is successfully connected to the electric vehicle when the voltage at the detection point reaches the ninth preset value.

[0307] Method 3: Identify through A+ and A- ports

[0308] In one embodiment, as shown in Figure 21, the charging connection device also includes an auxiliary power socket, an auxiliary power circuit, a first connection confirmation socket and a first connection confirmation circuit, the auxiliary power socket is connected to the controller of the electric vehicle and the auxiliary power circuit, and the first connection confirmation socket is connected to the first connection confirmation circuit.

[0309] The auxiliary power supply circuit of the charging connection device includes a third resistor unit and a first normally closed switch connected in series, and the auxiliary power socket is connected to the voltage source through the third resistor unit and the first normally closed switch. The first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket of the charging connection device is connected to the voltage source through the first resistor unit.

[0310] The charging connection device is used to: when the voltage at the detection point in the auxiliary power supply circuit of the charging connection device is a sixth preset value, confirm that the charging connection device is connected to the first charging gun; or when the voltage at the detection point in the auxiliary power supply circuit of the charging connection device is a seventh preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is an eighth preset value, confirm that the charging connection device is connected to the second charging gun, wherein the sixth preset value is different from the seventh preset value.

[0311] The detection point in the auxiliary power circuit of the charging connection device is located between the auxiliary power socket and the third resistor unit, and the detection point in the first connection confirmation circuit of the charging connection device is located between the first connection confirmation socket and the first resistor unit.

[0312] In the embodiments of the present application, the auxiliary power sockets are sockets A+ and A-, the first connection confirmation socket is socket CC2, the auxiliary power plugs are plugs A+ and A-, and the first connection confirmation plug is plug CC2. When the charging connection device is connected to a charging gun, the first connection confirmation circuit of the charging connection device forms a current loop with the first connection confirmation circuit of the charging pile via the first connection confirmation socket CC2 and the first connection confirmation plug CC2 of the charging gun. The auxiliary power circuit of the charging connection device is related to the type of charging gun it is connected to.

[0313] Specifically, when the charging connection device is connected to an MCS charging gun, the charging connection device's auxiliary power circuit forms a current loop with the charging pile's auxiliary power circuit through the auxiliary power sockets A+ and A- and the auxiliary power plugs A+ and A-. When the charging connection device is connected to a 2015 / 2015+ / supercharger charging gun, the charging connection device's auxiliary power circuit does not form a current loop with the charging pile's auxiliary power circuit.

[0314] Referring to Figures 21(a) and 21(b), it can be seen that in the embodiment of the present application, a control and guidance circuit is newly added to the circuit connected to the low-voltage auxiliary power port. Within the electric vehicle, a resistor Ra, a voltage source U2', a normally closed switch Sa1, and a normally open switch Sa2 are provided. One end of the resistor Ra is connected to the voltage source U2' via the normally closed switch Sa1, the other end of the resistor Ra is connected to the circuit of the low-voltage auxiliary power port, one end of the normally open switch Sa2 is connected to the vehicle's electrical platform, and the other end of the normally open switch Sa2 is connected to the circuit of the low-voltage auxiliary power port.

[0315] In the embodiment of the present application, the third resistor unit is resistor Ra, the first normally closed switch is switch Sa1, the detection point in the auxiliary power circuit is detection point 5 shown in the figure, the first resistor unit is resistor R5, and the detection point in the charging connection device is detection point 2 shown in the figure.

[0316] Among them, when (a) in Figure 21 corresponds to the vehicle socket connected to the 2015 / 2015+ / super charging gun, (b) in Figure 21 corresponds to the vehicle socket connected to the MCS charging gun.

[0317] In the initial state, the normally closed switch Sa1 is closed and the normally open switch Sa2 is open. Before the vehicle socket is connected to the charging gun, since detection point 5 is connected to voltage source U2', the voltage at detection point 5 should be the voltage output by voltage source U2'. When the vehicle socket is connected to the charging gun, voltage source U2 forms a loop through resistor R5 in the electric vehicle, resistor R3 in the charging pile, and the ground wire in the charging pile. Voltage source U2' forms or does not form a loop through resistor Ra in the electric vehicle, resistor Ra' in the charging pile, and the ground wire in the charging pile. Furthermore, the 2015 / 2015+ / supercharger charging gun corresponds to a situation where no loop is formed, which can be understood as the absence of resistor Ra' in the electric vehicle, while the MCS charging gun corresponds to a situation where a loop is formed, which can be understood as the presence of resistor Ra' in the electric vehicle. Therefore, if the vehicle socket is connected to a 2015 / 2015+ / supercharger charging gun, the voltage at detection point 5 should be the voltage output by voltage source U2; if the vehicle socket is connected to an MCS charging gun, the voltage at detection point 5 should be the preset value.

[0318] If the vehicle socket is connected to a 2015 / 2015+ / supercharger, the voltage at test point 5 is the voltage output by voltage source 2 before and after the charger is plugged into the vehicle socket. In this case, the voltage at test point 2 can be combined for confirmation.

[0319] For example, if the output voltage of voltage source U2 and voltage source U2' is set to 12V, and the resistance values ​​of Ra, Ra', R5, and R3 are all 1Ω, then when the voltage at detection point 5 is 6V, the charging connection device confirms that it is connected to an MCS charging gun. When the voltage at detection point 5 is 12V and the voltage at detection point 2 is 6V, the charging connection device confirms that it is connected to a 2015 / 2015+ / supercharger charging gun.

[0320] The recognition principles shown in (c) to (d) in FIG. 21 are similar to those shown in (a) to (b) in FIG. 21 and will not be repeated here.

[0321] It can be understood that the voltage source U2' shown in Figure 21 (a) to Figure 21 (d) can be shared with the voltage source U2. In other words, the voltage source U2' may not be set in the electric vehicle. The resistor Ra is connected to the voltage source U2 through the switch Sa1, and it can also be used to confirm whether the charging gun connected to the vehicle socket is a 2015 / 2015+ / super charging gun or an MCS charging gun.

[0322] In an embodiment of the present application, the charging connection device can confirm whether the electric vehicle is connected to the first charging gun or the second charging gun based on the voltage at the detection point in the auxiliary power circuit. Specifically, when the voltage at the detection point in the auxiliary power circuit of the charging connection device is a sixth preset value, the charging connection device confirms that the electric vehicle is connected to the first charging gun; when the voltage at the detection point in the auxiliary power circuit of the charging connection device is a seventh preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is an eighth preset value, the charging connection device confirms that the electric vehicle is connected to the second charging gun. This can improve the accuracy of the charging connection device in confirming the type of charging gun, which is beneficial for the charging connection device to send different messages to the charging pile based on the type of charging gun it is connected to.

[0323] In the embodiment of the present application, the voltage at the detection point in the first connection confirmation circuit of the charging connection device may have other functions in addition to being used to confirm the type of charging gun connected to the electric vehicle.

[0324] In one embodiment, when the voltage at the detection point in the first connection confirmation circuit of the charging connection device is the eighth preset value, it is confirmed that the charging connection device is successfully connected to the first charging gun or the second charging gun.

[0325] In the embodiment of the present application, referring to (a) to (b) in FIG. 21 above, the voltage output by the voltage source U2 is still set to 12V, and the resistance value of R5 is still set to 1Ω.

[0326] When the voltage at detection point 2 is 6V, the charging connection device can confirm that it is successfully connected to the 2015 / 2015+ / supercharger charging gun, or confirm that it is successfully connected to the MCS charging gun.

[0327] Referring to Figures 21(c) to 21(d) above, the charging connection device can confirm that it is successfully connected to the 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 2. Alternatively, the charging connection device can also confirm that it is successfully connected to the 2015 / 2015+ / Supercharger or MCS charging gun based on the voltage at detection point 2 and the voltage at detection point 3.

[0328] In an embodiment of the present application, when the voltage at the detection point in the first connection confirmation circuit is the eighth preset value, the charging connection device confirms that it is successfully connected to the first charging gun or the second charging gun, that is, the charging connection device can still use the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple and reliable to implement.

[0329] In one embodiment, the auxiliary power circuit of the charging connection device further includes a second normally open switch, and the auxiliary power socket is further connected to the vehicle body ground platform of the electric vehicle through the second normally open switch.

[0330] The charging connection device is further configured to: after confirming that the charging connection device is connected to the second charging gun, open the first normally closed switch and close the second normally open switch.

[0331] In this embodiment of the present application, when the charging connection device confirms that the vehicle socket is connected to a 2015 / 2015+ / supercharger charger, it should open the normally closed switch Sa1 and close the normally open switch Sa2. This is because if the normally closed switch Sa1 and the normally open switch Sa2 are not opened, the voltage at detection point 5 is 12V. The charging pile controller will confirm that the voltage at detection point 5 is non-zero and will not close switches K3 and K4, which will affect the normal charging process of the power battery.

[0332] When the charging connection device confirms that the vehicle socket is connected to an MCS charging gun, it should maintain the status of switches Sa1 and Sa2, that is, keep the normally closed switch Sa1 closed and the normally open switch Sa2 open. This is because if the normally closed switch Sa1 is opened or the normally open switch Sa2 is closed, the voltage at detection point 5 will not be 6V. If the voltage at detection point 5 is not 6V, the charging connection device may determine that the charging interface is faulty and disconnect the charging circuit switches K5, K6, K5', and K6', affecting the normal charging process of the power battery.

[0333] For the charging pile, the charging pile can confirm whether the charging gun is successfully connected to the electric vehicle based on the voltage of the detection point in the corresponding connection confirmation circuit.

[0334] In one embodiment, the charging gun also includes a first connection confirmation plug, a third connection confirmation plug, an auxiliary power plug, a first connection confirmation circuit, a third connection confirmation circuit and an auxiliary power circuit, the first connection confirmation plug is connected to the first connection confirmation circuit, the third connection confirmation plug is connected to the third connection confirmation circuit, the auxiliary power plug is connected to the auxiliary power circuit, and the auxiliary power plug is used to power the controller of the electric vehicle.

[0335] When the charging gun is connected to the electric vehicle, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the electric vehicle through the first connection confirmation plug and the first connection confirmation socket of the electric vehicle, the third connection confirmation circuit forms a current loop with the third connection confirmation circuit of the electric vehicle through the third connection confirmation plug and the third connection confirmation socket of the electric vehicle, and the auxiliary power supply circuit forms a current loop with the auxiliary power supply circuit of the electric vehicle through the auxiliary power supply plug and the auxiliary power supply socket of the electric vehicle.

[0336] The charging pile is used to: when the voltage of the detection point in the third connection confirmation circuit of the charging gun is a tenth preset value, confirm that the charging gun is successfully connected to the electric vehicle.

[0337] The charging gun in the embodiment of the present application is an MCS charging gun, and the first connection confirmation plug, the third connection confirmation plug, and the auxiliary power plug are respectively plug CC2, plug CC1, plug A+, and A-. When the MCS charging gun is connected to an electric vehicle, each connection confirmation circuit in the charging gun forms a current loop with the corresponding connection confirmation circuit in the electric vehicle through the corresponding connection confirmation plug and the connection confirmation socket, and the auxiliary power circuit in the charging gun forms a current loop with the auxiliary power circuit in the electric vehicle through the corresponding auxiliary power plug and the auxiliary power socket.

[0338] In an embodiment of the present application, since when the MCS charging gun is connected to the electric vehicle, the third connection confirmation circuit in the charging gun forms a current loop with the third connection confirmation circuit in the electric vehicle through the third connection confirmation plug and the third connection confirmation socket. Therefore, when the voltage of the detection point in the third connection confirmation circuit of the charging gun is the tenth preset value, the charging pile can confirm that the MCS charging gun is successfully connected to the electric vehicle.

[0339] In an embodiment of the present application, when the charging gun includes multiple sets of DC plugs, when the voltage of the detection point in the third connection confirmation circuit of the charging gun is the tenth preset value, the charging pile confirms that the charging gun is successfully connected to the electric vehicle. The third connection confirmation circuit in the embodiment of the present application is a connection confirmation circuit connected to the CC1 plug, that is, the electric vehicle still uses the connection confirmation circuit connected to the existing vehicle socket to confirm that it is successfully connected to the charging gun, which is simple to implement.

[0340] In one embodiment, the first connection confirmation circuit of the charging pile includes an eighth resistor unit, through which the first connection confirmation plug is connected to the device ground platform of the charging pile. The third connection confirmation circuit of the charging pile includes a ninth resistor unit, through which the third connection confirmation plug is connected to the voltage source, and the detection point is located between the third connection confirmation plug and the ninth resistor unit. The auxiliary power supply circuit of the charging pile includes a tenth resistor unit, through which the auxiliary power supply plug is connected to the device ground platform.

[0341] Taking Figure 21(b) as an example, in this embodiment, the eighth resistor unit is resistor R3, the ninth resistor unit is resistor R1, the tenth resistor unit is Ra', and the voltage source is U1. Assuming the output voltage of voltage source U1 is 12V, and the resistance values ​​of R1 and R4 are both 1Ω, the detection point in the charging gun's third connection confirmation circuit is detection point 1.

[0342] In this embodiment of the present application, before the charging gun is connected to the electric vehicle, the voltage at detection point 1 should be the voltage output by voltage source U1, that is, 12 V. When the charging gun is connected to the electric vehicle, voltage source U1 forms a loop through resistor R1 in the charging pile, resistor R4 in the electric vehicle, and the ground wire in the electric vehicle. Therefore, when the voltage at detection point 1 is 6 V, the charging pile can confirm that the MCS charging gun is successfully connected to the electric vehicle.

[0343] In this embodiment of the present application, when the charging pile is connected to the electric vehicle, the third connection confirmation circuit of the charging pile forms a loop with the third connection confirmation circuit of the charging connection device. Because the detection point is located between the third connection confirmation plug and the ninth resistor unit, the charging pile can confirm that the charging gun is successfully connected to the electric vehicle when the voltage at the detection point reaches the tenth preset value.

[0344] In one embodiment, the charging connection device further includes a third connection confirmation socket and a third connection confirmation circuit. The third connection confirmation socket is configured to connect to a third connection confirmation plug of the first charging gun or a third connection confirmation plug of the second charging gun. The third connection confirmation circuit includes a fourth resistor unit, and the third connection confirmation socket is connected to the vehicle body ground platform via the fourth resistor unit.

[0345] Referring to Figures 19 to 21 above, the third connection confirmation socket in the embodiment of the present application is socket CC1, and the circuit connected to socket CC1 is the third connection confirmation circuit. Taking (b) in Figure 21 above as an example, the fourth resistor unit includes resistor R4, resistor R6, and switch S2. When the charging gun is connected to the vehicle socket, the third connection confirmation circuit in the charging connection device and the third connection confirmation circuit in the charging pile form a current loop, which is beneficial for the charging pile to confirm whether it is successfully connected to the charging gun. The specific confirmation process is consistent with the existing one and will not be repeated here.

[0346] The present application also provides an electric vehicle, which includes the charging connection device and the power battery in any of the above embodiments, the charging connection device is connected to the power battery, and the charging connection device is used to receive direct current from the charging pile and transmit the direct current to the power battery.

[0347] Among them, please refer to the above content for the charging connection device in the electric vehicle, which will not be repeated here.

[0348] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A charging connection device, characterized in that, The charging connection device is applied to an electric vehicle. The charging connection device includes multiple groups of charging circuit switches and multiple groups of DC sockets. Each group of the charging circuit switches includes two switches. Each group of DC sockets in the multiple groups of DC sockets is used to connect a group of DC plugs of a charging pile. Each group of DC sockets includes a positive DC socket and a negative DC socket. Among them, each group of DC sockets is connected to the power battery of the electric vehicle through a group of the charging circuit switches, and different groups of DC sockets are connected to the power battery through different groups of the charging circuit switches; each group of DC sockets is used to receive the current output by different charging modules in the charging pile.

2. The charging connection device according to claim 1, characterized in that The charging connection device is used to send a message to the charging pile. The message includes information for instructing each group of the DC plugs of the charging pile to output the same magnitude of current.

3. The charging connection device according to claim 2, wherein The message further includes voltage information; when the multiple groups of DC sockets are connected to the same power battery, the message includes information for instructing each group of the DC plugs to output the same magnitude of voltage; or, when the multiple groups of DC sockets are respectively connected to different power batteries, the message includes information for instructing each group of the DC plugs to output the same magnitude or different magnitudes of voltage.

4. The charging connection device according to claim 2 or 3, characterized in that The charging connection device further includes multiple fuses. One fuse is connected in series between each group of DC sockets and the power battery. Each fuse is connected in series with one of the switches in the corresponding charging circuit switch and then connected between the DC socket and the power battery.

5. The charging connection device according to claim 4, characterized in that The charging connection device is used for: when the current flowing through the power line where the fuse is located is greater than the maximum current value allowed for the corresponding power line, disconnect the charging circuit switch connected to the fuse.

6. The charging connection device according to claim 5, characterized in that The charging connection device is further used for: sending a message to the charging pile for requesting to change the charging current.

7. The charging connection device according to claim 4, wherein The charging connection device is used for: when the magnitude of the current flowing through the power line where the fuse is located is greater than the maximum current value allowed for the corresponding power line, sending a message to the charging pile for requesting to reduce the magnitude of the current output by the DC plug connected to the DC socket connected to the fuse.

8. The charging connection device according to any one of claims 1 to 7, characterized in that, The charging connection device further includes at least one isolated DC-DC circuit and at least one insulation detection device. At least one of the isolated DC-DC circuits corresponds to at least one of the insulation detection devices one by one. Each isolated DC-DC circuit is connected in series between the charging circuit switch and the power battery; each insulation detection device is used for: during the charging process of the electric vehicle, performing insulation detection on the circuit between the output end of the charging module connected to the corresponding isolated DC-DC circuit and the corresponding DC plug.

9. The charging connection device according to any one of claims 1 to 8, characterized in that, The charging connection device is used for: confirming that the charging connection device is connected to a first charging gun or a second charging gun. The first charging gun includes multiple groups of DC plugs, and the second charging gun includes a group of DC plugs; when it is confirmed that the charging connection device is connected to the first charging gun, the message sent to the charging pile includes information for instructing the multiple groups of DC plugs to output the same magnitude of current; When it is confirmed that the connected charging connection device is the second charging gun, the message sent to the charging pile includes information for indicating the magnitude of the current output by the set of DC plugs.

10. The charging connection device according to claim 9, characterized in that, The charging connection device is further configured to: When the connected charging connection device is the first charging gun, if the charging loop switches connected to some of the multiple sets of DC sockets are stuck, send a message to the charging pile to request stopping the output of direct current by the DC plugs connected to the some of the DC sockets; When the connected charging connection device is the second charging gun, if the charging loop switch connected to the set of DC sockets connected to the second charging gun is stuck, send a message to the charging pile to request stopping the output of direct current by the DC plugs connected to the set of DC sockets.

11. The charging connection device according to claim 9 or 10, characterized in that, The charging connection device further includes a first connection confirmation socket and a first connection confirmation circuit, and the first connection confirmation socket is connected to the first connection confirmation circuit; When the charging connection device is connected to a charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the charging gun; The charging connection device is configured to: When the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a first preset value, confirm that the connected electric vehicle is the first charging gun; or, When the voltage at the detection point in the first connection confirmation circuit of the charging connection device is a second preset value, confirm that the connected electric vehicle is the second charging gun, where the first preset value is different from the second preset value.

12. The charging connection device according to claim 11, characterized in that, The charging connection device is further configured to: When the voltage at the detection point is the first preset value, confirm that the charging connection device is successfully connected to the first charging gun; When the voltage at the detection point is the second preset value, confirm that the charging connection device is successfully connected to the second charging gun.

13. The charging connection device according to claim 11 or 12, wherein The first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket is connected to a voltage source through the first resistor unit; The detection point is located between the first connection confirmation socket and the first resistor unit.

14. The charging connection device according to claim 9 or 10, characterized in that, The charging connection device further includes a first connection confirmation socket, a second connection confirmation socket, a first connection confirmation circuit and a second connection confirmation circuit, the first connection confirmation socket is connected to the first connection confirmation circuit, and the second connection confirmation socket is connected to the second connection confirmation circuit; When the charging connection device is connected to the first charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the first charging gun, and the second connection confirmation circuit forms a current loop with the second connection confirmation circuit of the charging pile through the second connection confirmation socket and the second connection confirmation plug of the first charging gun; When the charging connection device is connected to the second charging gun, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the charging pile through the first connection confirmation socket and the first connection confirmation plug of the second charging gun, and the second connection confirmation socket is not connected to the plug of the second charging gun; The charging connection device is further configured to: When the voltage at the detection point in the second connection confirmation circuit of the charging connection device is the third preset value, confirm that the charging connection device is connected to the first charging gun; or, When the voltage at the detection point in the second connection confirmation circuit of the charging connection device is the fourth preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is the fifth preset value, confirm that the charging connection device is connected to the second charging gun, where the third preset value is different from the fourth preset value.

15. The charging connection device according to claim 14, characterized in that, The charging connection device is further configured to: When the voltage at the detection point in the first connection confirmation circuit of the charging connection device is the fifth preset value, confirm that the charging connection device is successfully connected to the first charging gun or the second charging gun.

16. The charging connection device according to claim 14 or 15, wherein The first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket is connected to the voltage source through the first resistor unit; The second connection confirmation circuit of the charging connection device includes a second resistor unit, and the second connection confirmation socket is connected to the voltage source through the second resistor unit; The detection point in the first connection confirmation circuit of the charging connection device is located between the first connection confirmation socket and the first resistor unit, and the detection point in the second connection confirmation circuit of the charging connection device is located between the second connection confirmation socket and the second resistor unit.

17. The charging connection device according to claim 9 or 10, characterized in that, The charging connection device further includes an auxiliary power socket, an auxiliary power circuit, a first connection confirmation socket and a first connection confirmation circuit. The auxiliary power socket is connected to the controller of the electric vehicle and the auxiliary power circuit, and the first connection confirmation socket is connected to the first connection confirmation circuit; The auxiliary power circuit of the charging connection device includes a third resistor unit and a first normally closed switch connected in series, and the auxiliary power socket is connected to the voltage source through the third resistor unit and the first normally closed switch; The first connection confirmation circuit of the charging connection device includes a first resistor unit, and the first connection confirmation socket of the charging connection device is connected to the voltage source through the first resistor unit; The charging connection device is configured to: When the voltage at the detection point in the auxiliary power circuit of the charging connection device is the sixth preset value, confirm that the charging connection device is connected to the first charging gun; or, When the voltage at the detection point in the auxiliary power circuit of the charging connection device is the seventh preset value and the voltage at the detection point in the first connection confirmation circuit of the charging connection device is the eighth preset value, confirm that the charging connection device is connected to the second charging gun, where the sixth preset value is different from the seventh preset value; Among them, the detection point in the auxiliary power supply circuit of the charging connection device is located between the auxiliary power supply socket and the third resistor unit, and the detection point in the first connection confirmation circuit of the charging connection device is located between the first connection confirmation socket and the first resistor unit.

18. The charging connection device according to claim 17, characterized in that, The charging connection device is further configured to: When the voltage at the detection point in the first connection confirmation circuit of the charging connection device is the eighth preset value, confirm that the charging connection device is successfully connected to the first charging gun or the second charging gun.

19. The charging connection device according to claim 17 or 18, characterized in that, The auxiliary power supply circuit of the charging connection device further includes a second normally open switch, and the auxiliary power supply socket is also connected to the body ground platform of the electric vehicle through the second normally open switch; The charging connection device is further configured to: After confirming that the second charging gun is connected to the charging connection device, disconnect the first normally closed switch and close the second normally open switch.

20. The charging connection device according to any one of claims 11 to 19, characterized in that The charging connection device further includes a third connection confirmation socket and a third connection confirmation circuit, and the third connection confirmation socket is used to connect the third connection confirmation plug of the first charging gun or the third connection confirmation plug of the second charging gun; The third connection confirmation circuit includes a fourth resistor unit, and the third connection confirmation socket is connected to the body ground platform of the electric vehicle through the fourth resistor unit.

21. An electric vehicle, characterized in that, The electric vehicle includes the charging connection device and a power battery as described in any one of claims 1 to 20, the charging connection device is connected to the power battery, and the charging connection device is configured to receive direct current from the charging pile and deliver the direct current to the power battery.

22. A charging pile, characterized in that, The charging pile includes multiple groups of charging modules, multiple groups of DC power supply circuit switches, and multiple groups of DC plugs. The multiple groups of charging modules and the multiple groups of DC plugs correspond one by one. Each group of charging modules in the multiple groups of charging modules includes multiple parallel-connected charging modules. Each group of the DC power supply circuit switches includes two switches. Each group of DC plugs in the multiple groups of DC plugs is used to connect a group of DC sockets of the electric vehicle. Each group of DC plugs includes a positive DC plug and a negative DC plug; among them, Each group of charging modules is connected to a group of the DC plugs through a group of DC power supply circuit switches, and different groups of charging modules are connected to different groups of DC plugs through different groups of DC power supply circuit switches.

23. The charging pile according to claim 22, wherein When the multiple groups of DC plugs are connected to the multiple groups of DC sockets, each group of charging modules is configured to output the same magnitude of current and the same magnitude of voltage; or, When the multiple groups of DC plugs are connected to the multiple groups of DC sockets, each group of charging modules is configured to output the same magnitude of current and different magnitudes of voltage.

24. The charging pile according to claim 22 or 23, characterized in that, The charging pile further includes multiple fuses. One fuse is connected between each group of charging modules and the corresponding DC plug, and each fuse is connected in series with one of the switches in the corresponding DC power supply circuit switch and then connected between the charging module and the DC plug.

25. The charging pile according to claim 24, wherein, The charging pile is configured to: When the magnitude of the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed for the corresponding transmission line, disconnect the DC power supply circuit switch connected to the fuse.

26. The charging pile according to claim 25, characterized in that, The charging pile is further configured to: Adjust the magnitude of the current output by each of the charging modules corresponding to the DC power supply circuit switches in the closed state among multiple groups of DC power supply circuit switches.

27. The charging pile according to claim 24, characterized in that, The charging pile is configured to: When the magnitude of the current flowing through the transmission line where the fuse is located is greater than the maximum current value allowed for the corresponding transmission line, reduce the magnitude of the current output by a group of charging modules connected to the fuse.

28. The charging pile according to any one of claims 22 to 27, characterized in that, The charging pile further includes a plurality of insulation detection devices, and the plurality of insulation detection devices correspond to the multiple groups of charging modules one by one; Each of the insulation detection devices is configured to: when the DC plug is connected to the DC socket, perform insulation detection on the circuit between the output end of the corresponding group of charging modules and the corresponding DC power supply circuit switch.

29. The charging pile according to any one of claims 22 to 28, characterized in that, The charging pile includes a charging gun, and the charging gun includes the multiple groups of DC plugs; The charging pile is configured to: When the charging gun is connected to the DC socket, if the DC power supply circuit switches connected by some of the multiple groups of DC plugs are stuck, control the groups of charging modules connected to each of the DC plugs in the part to stop outputting direct current.

30. The charging pile according to claim 29, characterized in that, The charging gun further includes a first connection confirmation plug, a second connection confirmation plug, a third connection confirmation plug, a first connection confirmation circuit, a second connection confirmation circuit, and a third connection confirmation circuit. The first connection confirmation plug is connected to the first connection confirmation circuit, the second connection confirmation plug is connected to the second connection confirmation circuit, and the third connection confirmation plug is connected to the third connection confirmation circuit; When the charging gun is connected to the electric vehicle, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the electric vehicle through the first connection confirmation plug and the first connection confirmation socket of the electric vehicle, the second connection confirmation circuit forms a current loop with the second connection confirmation circuit of the electric vehicle through the second connection confirmation plug and the second connection confirmation socket of the electric vehicle, and the third connection confirmation circuit forms a current loop with the third connection confirmation circuit of the electric vehicle through the third connection confirmation plug and the third connection confirmation socket of the electric vehicle; The charging pile is configured to: When the voltage at the detection point in the third connection confirmation circuit of the charging gun is the ninth preset value, confirm that the charging gun is successfully connected to the electric vehicle.

31. The charging pile according to claim 30, characterized in that, The first connection confirmation circuit of the charging pile includes a fifth resistor unit, and the first connection confirmation plug is connected to the equipment ground platform of the charging pile through the fifth resistor unit; The second connection confirmation circuit of the charging pile includes a sixth resistor unit, and the second connection confirmation plug is connected to the equipment ground platform through the sixth resistor unit; The third connection confirmation circuit of the charging pile includes a seventh resistor unit, the third connection confirmation plug is connected to a voltage source through the seventh resistor unit, and the detection point is located between the third connection confirmation plug and the seventh resistor unit.

32. The charging pile according to claim 29, characterized in that, The charging gun further includes a first connection confirmation plug, a third connection confirmation plug, an auxiliary power supply plug, a first connection confirmation circuit, a third connection confirmation circuit, and an auxiliary power supply circuit. The first connection confirmation plug is connected to the first connection confirmation circuit, the third connection confirmation plug is connected to the third connection confirmation circuit, the auxiliary power supply plug is connected to the auxiliary power supply circuit, and the auxiliary power supply plug is used to supply power to the controller of the electric vehicle; When the charging gun is connected to the electric vehicle, the first connection confirmation circuit forms a current loop with the first connection confirmation circuit of the electric vehicle through the first connection confirmation plug and the first connection confirmation socket of the electric vehicle. The third connection confirmation circuit forms a current loop with the third connection confirmation circuit of the electric vehicle through the third connection confirmation plug and the third connection confirmation socket of the electric vehicle. The auxiliary power supply circuit forms a current loop with the auxiliary power supply circuit of the electric vehicle through the auxiliary power supply plug and the auxiliary power supply socket of the electric vehicle; The charging pile is used for: When the voltage at the detection point in the third connection confirmation circuit of the charging gun is the tenth preset value, it is confirmed that the charging gun is successfully connected to the electric vehicle.

33. The charging pile according to claim 32, wherein, The first connection confirmation circuit of the charging pile includes an eighth resistor unit, and the first connection confirmation plug is connected to the equipment ground platform of the charging pile through the eighth resistor unit; The third connection confirmation circuit of the charging pile includes a ninth resistor unit, the third connection confirmation plug is connected to the voltage source through the ninth resistor unit, and the detection point is located between the third connection confirmation plug and the ninth resistor unit; The auxiliary power supply circuit of the charging pile includes a tenth resistor unit, and the auxiliary power supply plug is connected to the equipment ground platform through the tenth resistor unit.

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