A charging device for an electric vehicle

Abstract

The present invention discloses a charging device for an electric vehicle, which includes a charger and a charging plug; the charger includes a charger controller, a first control switch and a second control switch connected to the charger controller; the charging plug is embedded with a first explosion-proof insulating sleeve, and a charging line passes through the first explosion-proof insulating sleeve to connect the charger and the charging plug. The first control switch is used to control the on-off of the DC charging line, and the second control switch is used to control the on-off of the CAN communication line and the auxiliary power supply line; a first power supply is connected to the connection confirmation line in the charging plug, one end of a first proximity switch is connected between the first power supply and the connection confirmation line, and the other end is grounded; a first proximity element is provided in the charging plug, and the first proximity element is used to control the on-off of the first proximity switch. The above charging device can ensure the charging safety of electric vehicles in an explosive environment.

Description

Technical Field

[0001] This application relates to the field of explosion-proof safety technology, and particularly to a charging device for electric vehicles. Background Art

[0002] With the development of electric vehicle technology, electric vehicles are more and more widely used in mines (such as coal mines). However, different from the conventional application environment, electric vehicles face unique problems in charging in the mine scenario: First, it is extremely inconvenient for all electric vehicles to drive to the ground for charging. Second, the mine environment is a potential explosive environment, and when charging an electric vehicle in the mine, explosion-proof safety must be ensured, so the same charging socket as that of ground civilian vehicles cannot be used. Third, the probability of thermal runaway of lithium batteries during charging is relatively high, and battery safety during charging needs to be ensured in an explosive environment. Fourth, after the electric vehicle used underground in coal mines is charged, the explosion-proof safety of the whole vehicle must be ensured before it can work or start. Summary of the Invention

[0003] The present invention provides a charging device for electric vehicles to solve or partially solve the technical problem of charging safety of electric vehicles in an explosive environment.

[0004] To solve the above technical problem, the present invention provides a charging device for electric vehicles, including a charger and a charging plug; the charger includes a charger controller, a first control switch and a second control switch connected to the charger controller; the charging plug is embedded with a first explosion-proof insulating sleeve, and a charging line passes through the first explosion-proof insulating sleeve to connect the charger and the charging plug. The charging line includes a DC charging line, a CAN communication line, a connection confirmation line and an auxiliary power supply line, and the CAN communication line and the connection confirmation line are connected to the charger controller;

[0005] The first control switch is used to control the on-off of the DC charging line, and the second control switch is used to control the on-off of the CAN communication line and the auxiliary power supply line;

[0006] A first power supply is connected to the connection confirmation line in the charging plug. A first proximity switch is further provided in the charging plug. One end of the first proximity switch is connected between the first power supply and the connection confirmation line, and the other end is grounded; a first proximity element is provided in the charging plug, and the first proximity element is used to control the on-off of the first proximity switch;

[0007] Wherein, when the charging plug is inserted into the charging socket of the vehicle power supply, and the first explosion-proof insulating sleeve forms a first explosion-proof surface with the charging plug housing and the power supply housing of the vehicle power supply, the first proximity element approaches the first proximity switch, causing the first proximity switch to close or open; the charger controller is configured to, when detecting a change in the potential at the connection contact of the connection confirmation line and the first power supply, connect the auxiliary power supply line and the CAN communication line through the second control switch for charging handshaking; after completing the charging handshaking, connect the DC charging line through the first control switch and charge the vehicle power supply.

[0008] Optionally, the first proximity switch is a Hall switch, and the first proximity element is a magnetic push rod.

[0009] Optionally, the Hall switch includes a hollow housing, a spring, and a Hall element. The spring is embedded in the hollow housing and sleeved on the magnetic push rod; the Hall element is disposed in the hollow housing at an end away from the magnetic push rod;

[0010] Wherein, when the charging plug is inserted into the charging socket of the vehicle power supply, and the first explosion-proof insulating sleeve forms a first explosion-proof surface with the charging plug housing and the power supply housing of the vehicle power supply, the magnetic push rod approaches the Hall element, so that the Hall element connects or disconnects the Hall switch under the influence of magnetic force.

[0011] Optionally, the charging line further includes a grounding line connected to the charger controller, and the first control switch is connected to the grounding line.

[0012] Optionally, the connection confirmation line includes a CC1 line and a CC2 line. The first power supply is connected to the CC1 line. One end of the first proximity switch is connected between the first power supply and the CC1 line, and the other end is grounded.

[0013] Optionally, the charging device further includes a vehicle controller, a third control switch, a fourth control switch located in the vehicle power supply, and a charging socket disposed at the vehicle power supply. The third control switch and the fourth control switch are connected to the vehicle controller; the charging socket includes a socket line matching the charging line, and the socket line connects the charging socket and the vehicle power supply;

[0014] The third control switch is used to control the on / off of the DC charging line in the vehicle power supply, and the fourth control switch is used to control the on / off of the CAN communication line and the auxiliary power supply line in the vehicle power supply;

[0015] When the charging plug is inserted into the charging socket of the vehicle power supply, and the first flameproof insulating sleeve forms a first flameproof surface with the charging plug housing and the power supply housing of the vehicle power supply, the vehicle controller is configured to, when detecting a change in the potential at the connection contact between the connection confirmation line and the first power supply, connect the auxiliary power supply line and the CAN communication line through the fourth control switch for charging handshaking; after completing the charging handshaking, connect the DC charging line through the third control switch to charge the vehicle power supply.

[0016] Optionally, the charging socket is provided with a socket protection cover, and the socket protection cover is provided with a second proximity element; a second power supply is connected to the connection confirmation line in the charging socket, and a second proximity switch is provided in the charging socket. One end of the second proximity switch is connected between the second power supply and the connection confirmation line, and the other end is grounded.

[0017] Wherein, when the socket protection cover is closed, the second proximity element approaches the second proximity switch to disconnect the second proximity switch; the vehicle controller is configured to unlock the power output of the vehicle power supply when detecting an increase in the potential at the connection contact between the connection confirmation line and the second power supply.

[0018] Optionally, the connection confirmation line includes a CC1 line and a CC2 line, the second power supply is connected to the CC2 line, and one end of the second proximity switch is connected between the second power supply and the CC2 line, and the other end is grounded.

[0019] Optionally, the charging device further includes a second flameproof insulating sleeve embedded in the charging socket, the socket line passes through the second flameproof insulating sleeve, and the second flameproof insulating sleeve forms a second flameproof surface with the power supply housing.

[0020] Optionally, the charging socket is provided with a locking mechanism, and the locking mechanism is configured to lock the charging plug when the charging plug is inserted into the charging socket.

[0021] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0022] The present invention provides a charging device for an electric vehicle. By embedding a first explosion-proof insulating sleeve in the charging plug, when the charging plug is inserted into the charging socket of the vehicle-mounted power supply, the first explosion-proof insulating sleeve can form a first explosion-proof surface with the power supply housing of the vehicle-mounted power supply. At this time, the first proximity element approaches the first proximity switch to make it closed or open. The change in the switch state causes a change in the potential at the connection point between the connection confirmation line and the first power supply. When the charger controller detects this potential change, the auxiliary power supply line and the CAN communication line are connected through the second control switch for charging handshake. After the charging handshake is completed, the DC charging line is connected through the first control switch to charge the vehicle-mounted power supply. Therefore, for the charging device provided by the present invention, only after the charging plug and the power supply housing form a first explosion-proof surface that meets the explosion-proof requirements, is the charger allowed to perform a charging handshake and DC charging with the electric vehicle. When the first explosion-proof surface is not formed or is damaged, the charger will not be able to continue charging the electric vehicle, thus ensuring the charging safety of the electric vehicle in an explosive environment and avoiding the explosion risk caused by hot plugging.

[0023] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components.

[0025] In the drawings:

[0026] Figure 1 A circuit schematic diagram of the charger and the charging plug in the charging device according to an embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram of the charging plug inserted into the charging socket according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic diagram showing an embodiment of the present invention Figure 2 An enlarged schematic diagram of area B in the figure;

[0029] Figure 4 A circuit schematic diagram of the charging socket and the vehicle-mounted power supply in the charging device according to an embodiment of the present invention is shown;

[0030] Figure 5Shows a schematic structural diagram of a charging socket according to an embodiment of the present invention (with the charging socket cover closed);

[0031] Figure 6 Shows a front view in the A direction according to an embodiment of the present invention in Figure 5 (with the charging socket cover removed);

[0032] Explanation of reference numerals:

[0033] 10, charger; 11, charger controller; 12, first safety barrier; K1, first control switch; K2, second control switch; 13, charging protection circuit;

[0034] 20, charging plug; 21, first explosion-proof insulating sleeve; 22, first proximity switch; 221, hollow housing; 222, spring; 223, Hall element; 23, first proximity element; 231, magnetic push rod; 24, electromagnetic lock; 25, locking bolt; 26, charging line; 27, charging plug housing; VCC1, first power supply;

[0035] 30, charging socket; 31, second proximity switch; 32, second proximity element; 33, second explosion-proof insulating sleeve; 34, socket protection cover; 35, locking mechanism; 36, socket line; 37, socket fixing ring; VCC2, second power supply;

[0036] 40, vehicle-mounted power supply; 41, vehicle controller; 42, power supply housing; 43, second safety barrier; K3, third control switch; K4, fourth control switch. Detailed implementation manners

[0037] In order to enable those skilled in the art in the technical field to which the present application belongs to more clearly understand the present application, the technical solutions of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments. Throughout the specification, unless otherwise specifically stated, the terms used herein should be understood as having the meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. In case of contradiction, this specification prevails. Unless otherwise specifically stated, various devices used in the present invention, etc., can be obtained through market purchase or can be prepared by existing methods.

[0038] In order to enable electric vehicles to charge safely in an explosive environment and meet explosion-proof requirements, in an optional embodiment, please refer to Figure 1, a charging device for an electric vehicle is provided, which includes a charger 10 and a charging plug 20; the charger 10 includes a charger controller 11, a first control switch K1 and a second control switch K2 connected to the charger controller 11; the charging plug 20 is embedded with a first explosion-proof insulating sleeve 21, and a charging line 26 passes through the first explosion-proof insulating sleeve 21 to connect the charger 10 and the charging plug 20. The charging line 26 includes a DC charging line, a CAN communication line, a connection confirmation line and an auxiliary power supply line, and the CAN communication line and the connection confirmation line are connected to the charger controller 11; the first control switch K1 is used to control the on-off of the DC charging line, and the second control switch K2 is used to control the on-off of the CAN communication line and the auxiliary power supply line; a first power supply VCC1 is connected to the connection confirmation line in the charging plug 20, and a first proximity switch 22 is further provided in the charging plug 20. One end of the first proximity switch 22 is connected between the first power supply VCC1 and the connection confirmation line, and the other end is grounded. A first proximity element 23 is provided in the charging plug 20, and the first proximity element 23 is used to control the on-off of the first proximity switch 22;

[0039] Wherein, when the charging plug 20 is inserted into the charging socket 30 of the vehicle-mounted power supply 40, and the first explosion-proof insulating sleeve 21 forms a first explosion-proof surface with the charging plug housing 27 and the power housing 42 of the vehicle-mounted power supply 40, the first proximity element 23 approaches the first proximity switch 22 to make the first proximity switch 22 close or open; the charger controller 11 is used to make the auxiliary power supply line and the CAN communication line communicate for charging handshake through the second control switch K2 when detecting that the potential at the connection contact of the connection confirmation line and the first power supply VCC1 changes; after the charging handshake is completed, the DC charging line is connected through the first control switch K1 to charge the vehicle-mounted power supply 40.

[0040] Specifically, the charging line 26 and the charging plug 20 in this embodiment form a civilian nine-core charging socket that meets the standard requirements. The lines specifically include:

[0041] DC charging line: DC+ and DC-;

[0042] CAN communication line: S+ and S-;

[0043] Connection confirmation line: CC1 and CC2;

[0044] Auxiliary power supply line: A+ and A-;

[0045] Grounding line: PE.

[0046] Wherein, the charger controller 11 is connected to the CAN communication line, the connection confirmation line and the node line to control the charging process of the electric vehicle. The charger 10 is a ground station charger for charging the electric vehicle.

[0047] The first control switch K1 and the second control switch K2 can control the on / off of the corresponding circuits under the control of the charger controller 11. The first control switch K1 and the second control switch K2 can be relays or other types of circuit switches. Before the charging plug 20 is inserted into the charging socket 30 of the vehicle-mounted power supply 40, the first control switch K1 and the second control switch K2 are in the normally open state, that is, at this time, the DC charging circuit, the CAN communication circuit, and the auxiliary power supply circuit at the charger 10 and the charging plug 20 are all in the disconnected state. Optionally, the first control switch K1 is connected to the grounding circuit.

[0048] The first explosion-proof insulating sleeve 21 is embedded in the charging plug 20, and its position and shape are designed to satisfy that when the charging plug 20 is inserted into the charging socket 30 of the electric vehicle's vehicle-mounted power supply 40, the first explosion-proof insulating sleeve 21 can form a complete first explosion-proof surface with the charging plug housing 27 and the power supply housing 42 of the vehicle-mounted power supply 40. The first explosion-proof surface meets the requirements of the national standard: GB / T 3836.2 to eliminate the explosion risk during the charging process. At the same time, the first proximity element 23 is close to the first proximity switch 22, causing a change in the connection state of the first proximity switch 22. It should be noted that a proximity switch is a circuit switch that can be operated without mechanical contact with a moving part. When an object part moves close to the sensing surface of the proximity switch, the proximity switch can be actuated to switch the connected or disconnected state without mechanical contact or applying any pressure.

[0049] In this embodiment, the first proximity switch 22 can be an inductive, capacitive, Hall, or AC / DC proximity switch. When the first proximity element 23 is far from the first proximity switch 22, the first proximity switch 22 can be in the closed or open state, and when the first proximity element 23 is close to the first proximity switch 22, the state of the first proximity switch 22 is correspondingly switched to open or closed. This will cause a change in the potential at the connection contact of the first power supply VCC1 and the connection confirmation circuit. When the charger controller 11 detects this potential change, it can control the second control switch K2 to close, connecting the auxiliary power supply circuit and the CAN communication circuit for charging handshake. Unless otherwise specified, the first proximity switch 22 in this embodiment uses a Hall switch, and the corresponding first proximity element 23 uses a magnetic push rod 231. The material of the magnetic push rod 231 can be a permanent magnetic material such as a magnetic steel or a neodymium iron boron permanent magnet.

[0050] This embodiment provides a charging device for an electric vehicle. By embedding a first explosion-proof insulating sleeve 21 in the charging plug 20, when the charging plug 20 is inserted into the charging socket 30 of the vehicle-mounted power supply 40, the first explosion-proof insulating sleeve 21 can form a first explosion-proof surface with the power supply housing 42 of the vehicle-mounted power supply 40. At this time, the first proximity element 23 approaches the first proximity switch 22 to make it close or open. The change in the switch state causes the potential at the connection point of the connection confirmation line and the first power supply VCC1 to change. When the charger controller 11 detects this potential change, the auxiliary power supply line and the CAN communication line are connected through the second control switch K2 for charging handshake. After completing the charging handshake, the DC charging line is connected through the first control switch K1 to charge the vehicle-mounted power supply 40. Therefore, for the charging device provided by the present invention, after the charging plug 20 and the charging plug housing 27 and the power supply housing 42 form a first explosion-proof surface that meets the explosion-proof requirements, the charger 10 is allowed to perform a charging handshake and DC charging with the electric vehicle. When the first explosion-proof surface is not formed or is damaged, the charger 10 will not be able to continue charging the electric vehicle, thus ensuring the charging safety of the electric vehicle in an explosive environment and avoiding the explosion risk caused by hot plugging.

[0051] In some alternative embodiments, the connection confirmation line includes a CC1 line and a CC2 line. The first power supply VCC1 is connected to the CC1 line. One end of the first proximity switch 22 is connected between the first power supply VCC1 and the CC1 line, and the other end is grounded. In this way, the charger controller 11 controls the connection or closing of the second control switch K2 based on the change in the voltage value of the CC1 line.

[0052] In some alternative embodiments, as Figure 1 shown, the charging plug 20 further includes a first resistor R1, a second resistor R2, and a third resistor R3. The first resistor R1 is connected in series between the first proximity switch 22 and the CC1 line. The second resistor R2 is connected in series between the first power supply VCC1 and the CC1 line. One end of the third resistor R3 is connected to the CC2 line, and the other end is grounded. The first resistor R1, the second resistor R2, and the third resistor R3 are intrinsically safe design resistors to prevent the current value in the line from reaching the explosion threshold, thereby improving the charging safety of the charging plug 20.

[0053] In some alternative embodiments, an electromagnetic lock 24 and a corresponding locking bolt 25 are further provided on the charging plug 20. The electromagnetic lock 24 is used to be energized instantly when the charging plug 20 is inserted into the charging socket 30, so that the charging plug 20 is tightly combined with the electric vehicle and has an attached suction force. After the battery of the vehicle-mounted power supply 40 is fully charged, the switch is activated to unlock, and a thrust is applied to push open the charging socket 30, that is, the charging gun.

[0054] In some alternative embodiments, a charging protection circuit 13 is also connected in series on the DC charging line of the charger 10 to prevent the DC charging line from being overloaded.

[0055] In some alternative embodiments, the schematic connection relationship after the charging plug 20 is inserted into the charging socket 30 can be referred to Figures 2 to 3 . In Figure 2 , the charging plug 20 is inserted into the charging socket 30 from right to left; in Figure 3 , a solution is provided in which the first proximity switch 22 is a Hall switch, including a hollow housing 221, a spring 222, and a Hall element 223. The spring 222 is embedded in the hollow housing 221 and sleeved on the magnetic push rod 231; the Hall element 223 is arranged in the hollow housing 221 at one end far from the magnetic push rod 231. Wherein, when the charging plug 20 is inserted into the charging socket 30 of the vehicle-mounted power supply 40, and the first explosion-proof insulating sleeve 21 forms a first explosion-proof surface with the charging plug housing 27 and the power supply housing 42 of the vehicle-mounted power supply 40, the magnetic push rod 231 approaches the Hall element 223, so that the Hall element 223 is connected or disconnected under the influence of magnetic force to the Hall switch.

[0056] Specifically, the magnetic push rod 231 is arranged on the charging plug 20 of the charger 10, specifically at the end where the charging plug 20 is inserted into the charging socket 30. When the charging plug 20 is not inserted into the charging socket 30, the spring 222 rebounds to push out the magnetic push rod 231, making it away from the Hall element 223. When the Hall element 223 is not affected by magnetic force, the Hall switch is in a connected state, and at this time, the potential or voltage at the connection contact of the first power supply VCC1 and the connection confirmation line is in a relatively low voltage state. The charger controller 11 keeps the second control switch K2 in the off state according to the voltage value at this time, that is, the CAN communication line and the auxiliary power supply line are in a disconnected state.

[0057] After the charging plug 20 is inserted into the charging socket 30, the magnetic push rod 231 compresses the spring 222 and approaches the Hall switch under the influence of the charging socket 30. When the charging plug 20 is inserted in place and the first explosion-proof insulating sleeve 21 and the power supply housing 42 of the vehicle-mounted power supply 40 form a complete first explosion-proof surface, the magnetic push rod 231 reaches the set position, and the Hall element 223 is attracted by magnetic force to disconnect the Hall switch. At this time, the potential or voltage at the connection contact of the first power supply VCC1 and the connection confirmation line rises. The charger controller 11 detects the rising change of the contact potential and issues a control signal to close the second control switch K2, connecting the CAN communication line and the auxiliary power supply line, and performing a charging handshake with the electric vehicle. After the handshake is successful, the charger controller 11 then controls the first control switch K1 to close to connect the DC charging line for charging.

[0058] The structural and positional design of the first proximity switch 22 of the above Hall structure and the first proximity element 23 of the magnetic push rod 231 can improve the control sensitivity of the charger 10 during charging after the charging plug 20 is properly mated with the vehicle-mounted charging socket 30 to form a complete first explosion-proof surface, thereby achieving a good effect of electrical interlock explosion protection.

[0059] In the foregoing embodiment, by designing the structures of the charger 10 and the charging plug 20, safe charging of the electric vehicle in an explosive environment is achieved. To further improve charging safety, the design of the charging socket 30 at the electric vehicle end can also be adjusted based on the structural design at the charger 10 and charging plug 20 ends.

[0060] In some alternative embodiments, as Figures 4 to 5 shown, the charging device further includes a vehicle controller 41, a third control switch K3, a fourth control switch K4 located in the vehicle power supply 40, and a charging socket 30 provided at the vehicle power supply 40. The third control switch K3 and the fourth control switch K4 are connected to the vehicle controller 41; the charging socket 30 includes a socket line 36 that matches the charging line 26, and the socket line 36 connects the charging socket 30 and the vehicle power supply 40; the third control switch K3 is used to control the on / off of the DC charging line in the vehicle power supply 40, and the fourth control switch K4 is used to control the on / off of the CAN communication line and the auxiliary power supply line in the vehicle power supply 40;

[0061] wherein, when the charging plug 20 is inserted into the charging socket 30 of the vehicle power supply 40, and the first explosion-proof insulating sleeve 21 and the charging plug housing 27, the power supply housing 42 of the vehicle power supply 40 form a first explosion-proof surface, the vehicle controller 41 is used to, when detecting that the potential at the connection contact of the connection confirmation line and the first power supply VCC1 changes, make the auxiliary power supply line and the CAN communication line communicate through the fourth control switch K4 for charging handshake; after the charging handshake is completed, the DC charging line is connected through the third control switch K3 to charge the vehicle power supply 40.

[0062] It can be understood that the socket line 36 is a wiring line that matches the charging line 26 at the ground charger 10 end, and also includes:

[0063] DC charging line: DC+ and DC-;

[0064] CAN communication line: S+ and S-;

[0065] Connection confirmation line: CC1 and CC2;

[0066] Auxiliary power supply line: A+ and A-;

[0067] Grounding line: PE.

[0068] For the socket illustration of the charging socket 30, please refer to Figure 6 .

[0069] Based on the designs of the charger 10 and the charging socket 30 in the foregoing embodiments, this embodiment improves the cooperation between the charging socket 30 and the vehicle-mounted power supply 40 on the electric vehicle side. Among them, when the charging plug 20 is not inserted into the charging socket 30, the third control switch K3 and the fourth control switch K4 are in the normally open state. When the charging plug 20 is inserted into the charging socket 30 and the first explosion-proof insulating sleeve 21 forms a first explosion-proof surface with the charging plug housing 27 and the power supply housing 42, the vehicle controller 41 can also synchronously detect that the potential at the connection contact between the connection confirmation line and the first power supply VCC1 on the connection confirmation line changes. At this time, the vehicle controller 41 is synchronized with the charger controller 11 to control the fourth control switch K4 to close so that the CAN communication line and the auxiliary power supply line at the charger 10 end and the electric vehicle end are connected, ensuring the smooth progress of the charging handshake; after the handshake is successful, the third control switch K3 is controlled to close, so that the DC charging line at the charger 10 end is connected to the DC charging line at the electric vehicle end for charging.

[0070] By adding a redundant design of the third control switch K3 and the fourth control switch K4 to the vehicle-mounted power supply 40 and making their control linked with the control of the first control switch K1 and the second control switch K2 by the charger controller 11, only when the following conditions are simultaneously met: 1) the charging plug 20 is plugged into the charging socket 30 in place and the first explosion-proof insulating sleeve 21 forms a first explosion-proof surface that meets the requirements of the national standard (GB / T 3836) with the power supply housing 42; 2) the DC charging line, CAN communication line, and auxiliary power supply line at the charger 10 end and the DC charging line, CAN communication line, and auxiliary power supply line at the vehicle-mounted power supply 40 end are simultaneously connected can charging be carried out, thereby further improving the charging safety of electric vehicles in an explosive environment.

[0071] Similarly, the third control switch K3 and the fourth control switch K4 can be selected to use relays or other types of circuit switches.

[0072] It should be noted that when an electric vehicle is charged in an explosive environment, not only the safety during the charging process needs to be ensured, but also it is necessary to note that after the charging is completed, the vehicle must be explosion-proof safe before power can be supplied for operation. Therefore, in some alternative embodiments, the charging socket 30 is provided with a socket protection cover 34, and a second proximity element 32 is provided on the socket protection cover 34; a second power supply VCC2 is connected to the connection confirmation line in the charging socket 30, and a second proximity switch 31 is provided in the charging socket 30. One end of the second proximity switch 31 is connected between the second power supply VCC2 and the connection confirmation line, and the other end is grounded; wherein, when the socket protection cover 34 is closed, the second proximity element 32 approaches the second proximity switch 31 to disconnect the second proximity switch 31; the vehicle controller 41 is configured to unlock the power output of the vehicle-mounted power supply 40 when detecting an increase in the potential at the connection contact of the connection confirmation line and the second power supply VCC2.

[0073] Specifically, in the above design, when the socket protection cover 34 is closed, the second proximity element 32 approaches the second proximity switch 31, causing the second proximity switch 31 to change from the connected state to the disconnected state. At this time, the contact potential of the connection point between the second power supply VCC2 and the connection confirmation line increases. The vehicle controller 41 unlocks the power output of the vehicle-mounted power supply 40 only when detecting this potential change, and only then can the electric vehicle start. The advantage of the above design is that if a fault occurs in the circuit of the vehicle-mounted power supply 40 and the charging socket 30 is still energized after charging, then the socket protection cover 34 can form an effective electrical interlock. Only when the charging plug 20 is unplugged and the socket protection cover 34 is closed is the vehicle-mounted power supply 40 allowed to supply power, enabling the charging socket 30 part to reach the protection level of Mb and ensuring the safety of electric vehicles entering the mining area.

[0074] Similar to the first proximity switch 22, the type of the second proximity switch 31 can be an inductive, capacitive, Hall-type, AC / DC type proximity switch, etc. Figure 5An alternative solution is provided. The second proximity switch 31 is a Hall proximity switch, and the second proximity element 32 is a magnetic head bolt, that is, the bolt is provided with a magnetic material. The magnetic head bolt is used to fix the socket protection cover 34 on the power supply housing 42. When the vehicle is charging, the magnetic head bolt is removed and the socket protection cover 34 is opened. At this time, the magnetic head bolt is far from the second proximity switch 31, and the second proximity switch 31 is in a closed state. The contact voltage between the second power supply VCC2 and the connection confirmation line is in a low voltage state, and the vehicle controller 41 prohibits the in-vehicle power supply 40 from outputting according to this voltage state. After charging is completed, the socket protection cover 34 is closed and the magnetic head bolt is screwed on. At this time, the magnetic head bolt approaches the second proximity switch 31, and the magnetic attraction force causes the second proximity switch 31 to disconnect, so that the contact voltage between the second power supply VCC2 and the connection confirmation line increases. The vehicle controller 41 detects this potential change and unlocks the power output of the in-vehicle power supply 40, that is, allows the in-vehicle power supply 40 to supply power to the motor or electrical equipment on the electric vehicle.

[0075] Considering that the connection confirmation line includes the CC1 line and the CC2 line, optionally, the second power supply VCC2 is connected to the CC2 line, one end of the second proximity switch 31 is connected between the second power supply VCC2 and the CC2 line, and the other end is grounded. In this way, it does not affect the charging controller 11 and the vehicle controller 41 to control the first control switch K1, the second control switch K2, the third control switch K3, and the fourth control switch K4 according to the contact voltage of the CC1 line, thereby effectively ensuring charging safety.

[0076] In some alternative embodiments, please refer to Figure 5 , the charging device further includes a second flameproof insulating sleeve 33 embedded in the charging socket 30. The socket line 36 passes through the second flameproof insulating sleeve 33, and the second flameproof insulating sleeve 33 and the power supply housing 42 form a second flameproof surface. In this way, after the charging plug 20 is inserted into the charging socket 30, the first flameproof surface and the second flameproof surface can form or ensure reliable isolation of the insertion cavity between the charging plug 20 and the charging socket 30, the main cavity of the charger 10, and the main cavity of the in-vehicle power supply 40, further improving the explosion-proof safety during vehicle charging. Optionally, the second flameproof insulating sleeve 33 is embedded in the charging socket 30 through a socket fixing ring 37.

[0077] In some alternative embodiments, please refer to Figure 5, the charging socket 30 is provided with a locking mechanism 35, which is used to lock the charging plug 20 when the charging plug 20 is inserted into the charging socket 30. By locking the charging plug 20 through the locking mechanism 35, it can ensure that the first explosion-proof insulating sleeve 21, the charging plug housing 27 and the power supply housing 42 form a complete and reliable explosion-proof joint surface (i.e., the first explosion-proof surface), that is, the reliable locking of the plugging cavity explosion-proof surface. If the locking structure does not lock the charging plug 20, the explosion-proof joint surface will separate under the action of the spring 222, causing the first limit switch to close again, reducing the voltage on the connection confirmation line, and the charger controller 11 will no longer charge the vehicle-mounted power supply 40 of the electric vehicle. Therefore, the locking mechanism can reliably protect the internal live components, enabling the charger 10 to achieve the effect of electrical interlock when charging the vehicle-mounted power supply 40.

[0078] In some alternative embodiments, please refer to Figure 4 , the charging socket 30 further includes a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; the fourth resistor R4 is connected in series between the second proximity switch 31 and the CC2 line, the fifth resistor R5 is connected in series between the second power supply VCC2 and the CC2 line, and one end of the sixth resistor R6 is connected to the CC1 line and the other end is connected to the fourth control switch K4. The fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are intrinsically safe design resistors to prevent the current value in the circuit from reaching the explosion threshold, thereby improving the safety of the charging socket 30 during the charging process.

[0079] In some alternative embodiments, a first safety barrier 12 is provided on the connection confirmation line in the charger 10, and a second safety barrier 43 is provided on the connection confirmation line in the vehicle-mounted power supply 40. The first safety barrier 12 and the second safety barrier 43 are used to limit the voltage and current on the connection confirmation line within the intrinsically safe range.

[0080] Combined with the charger 10, the charging plug 20, the charging socket 30 and the vehicle-mounted power supply 40 provided in the foregoing embodiments, the charging device provided by the present invention controls the charging process as follows:

[0081] 1) When the charging plug 20 is not inserted into the charging socket 30 or is not inserted in place:

[0082] The Hall element 223 in the first proximity switch 22 in the charging plug 20 is not attracted by the magnetic push rod 231 (magnet) and remains in the closed state; the first control switch K1 and the second control switch K2 are de-energized, and the contacts remain normally open. The external contacts of the DC charging line, the CAN communication line, and the auxiliary power supply line are all de-energized; only the contacts of the connection confirmation lines CC1 and CC2 are energized (provided by the first power supply VCC1 and the second power supply VCC2), and they are intrinsically safe contacts.

[0083] 2) The charging plug 20 is connected to the charging socket 30 in place:

[0084] ① The Hall element 223 in the first proximity switch 22 is attracted by the magnetic push rod 231, and the first proximity switch 22 switches to the off state. The charger controller 11 and the vehicle controller 41 detect that the CC1 voltage increases, and respectively control the second control switch K2 and the fourth control switch K4 to be energized, the contacts are closed, and the auxiliary power supply line and the CAN communication line are connected to conduct a charging handshake;

[0085] ② After the CAN communication handshake is successful, the charger controller 11 and the vehicle controller 41 respectively control the first control switch K1 and the third control switch K3 to be energized, the contacts are closed, and the charger 10 starts to charge the power battery in the vehicle power supply 40; at the same time, the CAN communication can continuously collect and monitor the voltage, current and temperature parameters of the power battery;

[0086] ③ After the charging is completed, the charger controller 11 and the vehicle controller 41 de-energize the first control switch K1 and the third control switch K3, the contacts are disconnected, and the charging stops;

[0087] ④ After the CAN communication ends, the charger controller 11 and the vehicle controller 41 de-energize the second control switch K2 and the fourth control switch K4, the contacts are disconnected, and the auxiliary power supply and the CAN communication are disconnected;

[0088] ⑤ The charger 10 and the electric vehicle end respectively indicate that the charging is completed.

[0089] 3) The charging plug 20 and the charging socket 30 are disconnected, and the socket protection cover 34 is fastened:

[0090] ① Disconnect the connection between the charging plug 20 and the charging socket 30, and then fasten the socket protection cover 34;

[0091] ② After the socket protection cover 34 is fastened, the second proximity element 32 (socket cover magnet) approaches the second proximity switch 31, and the second proximity switch 31 is disconnected under the action of the magnetic force. After the vehicle controller 41 detects that the CC2 voltage increases, the electric vehicle is unlocked, and the electric vehicle can be started and driven normally at this time.

[0092] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0093] 1) A first proximity element 23 and a first limit switch are provided on the charging plug 20 of the charger 10. When the power supply socket of the charging plug 20 and the charging socket 30 does not form a first explosion-proof surface meeting the requirements of GB / T 3836.2, the charger controller 11 disconnects the first control switch K1 and the second control switch K2, disconnecting the DC charging line, the CAN communication line, and the auxiliary power supply line at the charger 10 end. The charger 10 will not charge the vehicle power supply 40 or release electrical energy (except for intrinsically safe signals). If an external factor causes the first explosion-proof surface to be damaged during charging, the charging will also stop immediately to avoid the situation of hot plugging, thus significantly improving the charging safety of electric vehicles in an explosive environment;

[0094] 2) The structures of the charging plug 20 and the charging socket 30 can ensure reliable isolation between the plugging cavity and the wiring cavity during charging connection. Specifically, through the first explosion-proof surface and the second explosion-proof surface, the charging plugging part is divided into three cavities, namely: the plugging cavity body, the main cavity of the charger 10, and the main cavity of the vehicle power supply 40, and reliable isolation of the three is achieved. Through the first proximity switch 22 and the logical relationship between the first proximity switch 22, the first control switch K1, and the second control switch K2, reliable electrical interlocking is achieved, improving charging safety. Additionally, through the locking mechanism 35 introduced in the structure, mechanical interlocking is also achieved;

[0095] 3) A second proximity element 32 is provided on the socket protection cover 34 of the charging socket 30 of the vehicle power supply 40 (battery power supply box), and a second proximity switch 31 is provided inside the charging socket 30. When the charging socket 30 is open and the socket protection cover 34 is not closed or not closed in place, the vehicle controller 41 prohibits the vehicle power supply 40 from outputting electrical energy according to the potential value of the connection confirmation line inside the charging socket 30, thereby preventing the electric vehicle from starting and improving driving safety. At this time, a warning light can be set on the body of the electric vehicle for reminder;

[0096] 4) By using the communication components on the charging socket 30, the charging plug 20, and the electric vehicle, the battery parameters of the vehicle power supply 40 during charging can be locally displayed and uploaded. By comparing with the data collected in the past and performing data analysis in the cloud, early warnings can be issued for batteries that may malfunction. In underground coal mines, the vehicle power supply for electric vehicles can be repaired or otherwise processed based on the early warnings to prevent accidents.

[0097] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0098] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. A charging device for an electric vehicle, characterized in that, It includes a charger and a charging plug; the charger includes a charger controller, a first control switch and a second control switch connected to the charger controller; the charging plug is embedded with a first explosion-proof insulating sleeve, and a charging line passes through the first explosion-proof insulating sleeve to connect the charger and the charging plug. The charging line includes a DC charging line, a CAN communication line, a connection confirmation line and an auxiliary power supply line, and the CAN communication line and the connection confirmation line are connected to the charger controller; The first control switch is used to control the on / off of the DC charging line, and the second control switch is used to control the on / off of the CAN communication line and the auxiliary power supply line; A first power supply is connected to the connection confirmation line in the charging plug. A first proximity switch is also provided in the charging plug. One end of the first proximity switch is connected between the first power supply and the connection confirmation line, and the other end is grounded; a first proximity element is provided in the charging plug, and the first proximity element is used to control the on / off of the first proximity switch; Wherein, when the charging plug is inserted into the charging socket of the vehicle-mounted power supply, and the first explosion-proof insulating sleeve forms a first explosion-proof surface with the charging plug housing and the power supply housing of the vehicle-mounted power supply, the first proximity element approaches the first proximity switch to make the first proximity switch close or open; the charger controller is used to make the auxiliary power supply line and the CAN communication line communicate for charging handshake by the second control switch when detecting that the potential at the connection contact between the connection confirmation line and the first power supply changes; after the charging handshake is completed, the DC charging line is made to communicate by the first control switch and charge the vehicle-mounted power supply.

2. The charging device according to claim 1, wherein, The first proximity switch is a Hall switch, and the first proximity element is a magnetic push rod.

3. The charging device according to claim 2, wherein, The Hall switch includes a hollow housing, a spring and a Hall element. The spring is embedded in the hollow housing and sleeved on the magnetic push rod; the Hall element is arranged in the hollow housing at the end far from the magnetic push rod; Wherein, when the charging plug is inserted into the charging socket of the vehicle-mounted power supply, and the first explosion-proof insulating sleeve forms a first explosion-proof surface with the charging plug housing and the power supply housing of the vehicle-mounted power supply, the magnetic push rod approaches the Hall element to make the Hall element connect or disconnect the Hall switch under the influence of magnetic force.

4. The charging device according to claim 1, characterized in that The charging line further includes a grounding line connected to the charger controller, and the first control switch is connected to the grounding line.

5. The charging device according to claim 1, characterized in that, The connection confirmation line includes a CC1 line and a CC2 line. The first power supply is connected to the CC1 line. One end of the first proximity switch is connected between the first power supply and the CC1 line, and the other end is grounded.

6. The charging device according to any one of claims 1 to 5, characterized in that It further includes a vehicle controller, a third control switch, a fourth control switch located within the vehicle power supply, and a charging socket provided at the vehicle power supply. The third control switch and the fourth control switch are connected to the vehicle controller; the charging socket includes a socket line that matches the charging line, and the socket line connects the charging socket and the vehicle power supply; The third control switch is used to control the on / off of the DC charging line within the vehicle power supply, and the fourth control switch is used to control the on / off of the CAN communication line and the auxiliary power supply line within the vehicle power supply; Wherein, when the charging plug is inserted into the charging socket of the vehicle power supply, and the first explosion-proof insulating sleeve forms a first explosion-proof surface with the charging plug housing and the power supply housing of the vehicle power supply, the vehicle controller is used to, when detecting a change in the potential at the connection contact of the connection confirmation line and the first power supply, make the auxiliary power supply line and the CAN communication line communicate through the fourth control switch for charging handshake; after completing the charging handshake, the DC charging line is connected through the third control switch to charge the vehicle power supply.

7. The charging device according to claim 6, wherein The charging socket is provided with a socket protection cover, and a second proximity element is provided on the socket protection cover; a second power supply is connected to the connection confirmation line within the charging socket, and a second proximity switch is provided within the charging socket. One end of the second proximity switch is connected between the second power supply and the connection confirmation line, and the other end is grounded; Wherein, when the socket protection cover is closed, the second proximity element approaches the second proximity switch to make the second proximity switch disconnect; the vehicle controller is used to unlock the power output of the vehicle power supply when detecting an increase in the potential at the connection contact of the connection confirmation line and the second power supply.

8. The charging device according to claim 7, wherein The connection confirmation line includes a CC1 line and a CC2 line, the second power supply is connected to the CC2 line, one end of the second proximity switch is connected between the second power supply and the CC2 line, and the other end is grounded.

9. The charging device according to claim 6, wherein It further includes a second explosion-proof insulating sleeve embedded within the charging socket, the socket line passes through the second explosion-proof insulating sleeve, and the second explosion-proof insulating sleeve forms a second explosion-proof surface with the power supply housing.

10. The charging device according to claim 6, wherein, The charging socket is provided with a locking mechanism, and the locking mechanism is used to lock the charging plug when the charging plug is inserted into the charging socket.

Images