Liquid-cooled charging gun leakage detection system and liquid-cooled charging system

Abstract

The embodiment of the present invention discloses a liquid leakage detection system for a liquid-cooled charging gun and a liquid-cooled charging system. The liquid leakage detection system is arranged in the liquid-cooled charging gun, and the liquid leakage detection system includes a liquid leakage detection module, a liquid leakage detection circuit and a control module; the liquid leakage detection module is used to receive liquid leakage; the liquid leakage detection circuit is electrically connected to the liquid leakage detection module, and is used to transmit a reference detection signal to the liquid leakage detection module and receive a liquid leakage signal output by the liquid leakage detection module, and the liquid leakage signal is different under different liquid leakage states; the control module is electrically connected to the liquid leakage detection module, and is used to receive the liquid leakage signal and determine the liquid leakage state according to the liquid leakage signal. By arranging the liquid leakage detection system in the liquid-cooled charging gun, the liquid leakage state is determined in time based on the liquid leakage detection module, the liquid leakage detection circuit and the control module, and the danger caused by using the liquid-cooled charging gun in the case of uncertain liquid leakage is avoided.

Description

Technical Field

[0001] The present invention relates to the field of liquid-cooled charging technology, and in particular to a liquid leakage detection system for a liquid-cooled charging gun and a liquid-cooled charging system. Background Art

[0002] In recent years, my country's electric vehicle industry has achieved rapid development and overcome a series of key technical problems. The battery life of electric vehicles, such as the range of a single charge, charging time, and service life, have always been considered the biggest bottlenecks hindering the popularization of electric vehicles.

[0003] However, electric vehicles can travel about 200 kilometers on a single charge, which is completely unable to meet the needs of urban transportation. The key prerequisite for the popularization of electric vehicles is that there must be convenient and fast charging facilities and services. At present, my country's electric vehicle charging stations have not yet built a charging station service network that is truly oriented to different users. With the development and popularization of charging facilities, a large number of high-power liquid-cooled DC charging stations need to be built, and the liquid-cooled charging gun is the interface between the pile and the car. Therefore, all-round testing is required to ensure safety and reliability. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a leakage detection system for a liquid-cooled charging gun and a liquid-cooled charging system. The leakage detection system promptly determines the leakage status based on a leakage detection module, a leakage detection circuit and a control module to avoid safety hazards.

[0005] In a first aspect, an embodiment of the present invention provides a liquid leakage detection system for a liquid-cooled charging gun, wherein the liquid leakage detection system is arranged in the liquid-cooled charging gun, and the liquid leakage detection system includes a liquid leakage detection module, a liquid leakage detection circuit, and a control module;

[0006] The liquid leakage detection module is used to receive the liquid leakage;

[0007] The leakage detection circuit is electrically connected to the leakage detection module, and is used to transmit a reference detection signal to the leakage detection module and receive a leakage signal output by the leakage detection module, wherein the leakage signal is different under different leakage states;

[0008] The control module is electrically connected to the leakage detection circuit, and is used to receive the leakage signal and determine the leakage state according to the leakage signal. Optionally, the leakage detection circuit includes a reference circuit and a detection circuit;

[0009] The liquid leakage detection module includes a first connection end and a second connection end;

[0010] The reference circuit is electrically connected to the first connection end, and is used to transmit a reference voltage detection signal to the leakage detection module through the first connection end;

[0011] The detection circuit is electrically connected to the second connection end, and is used for receiving the leakage voltage signal output by the leakage detection module through the second connection end.

[0012] Optionally, the detection circuit includes a constant current detection subcircuit;

[0013] The constant current detection subcircuit is electrically connected to the second connection end, and the leakage detection circuit outputs a leakage voltage signal with a constant current based on the constant current detection subcircuit.

[0014] Optionally, the detection circuit includes an amplification subcircuit;

[0015] The amplifying sub-circuit is arranged in series between the second connecting end and the control module, and is used to amplify the leakage voltage signal and transmit the amplified leakage voltage signal to the control module.

[0016] Optionally, the reference circuit includes a first resistor, a second resistor, a third resistor, a first capacitor and a reference chip;

[0017] The first end of the first resistor and the first end of the first capacitor are both electrically connected to the power supply end, the second end of the first resistor is respectively electrically connected to the first end of the reference chip and the first end of the second resistor, the second end of the reference chip is respectively electrically connected to the second end of the second resistor and the first end of the third resistor, the third end of the reference chip, the second end of the third resistor and the second end of the first capacitor are all electrically connected to the ground end.

[0018] Optionally, the constant current detection subcircuit includes a fourth resistor, a fifth resistor, a first triode and a second triode;

[0019] The first end of the fourth resistor is electrically connected to the first connection end, the second end of the fourth resistor is electrically connected to the control end of the first transistor and the input end of the second transistor respectively, the input end of the first transistor is electrically connected to the second connection end, the output end of the first transistor is electrically connected to the control end of the second transistor and the first end of the fifth resistor respectively, and the output end of the second transistor and the second end of the fifth resistor are electrically connected to the ground end.

[0020] Optionally, the amplification sub-circuit includes a follower unit and an operational amplification unit;

[0021] The non-inverting input terminal of the follower unit is electrically connected to the second connection terminal, the inverting input terminal of the follower unit is electrically connected to the ground terminal, the output terminal of the follower unit is electrically connected to the non-inverting input terminal of the operational amplifier unit, the inverting input terminal of the operational amplifier unit is electrically connected to the ground terminal, and the output terminal of the operational amplifier unit is electrically connected to the control module.

[0022] Optionally, the leakage detection circuit further includes a surge protection module;

[0023] The surge protection module includes a first zener diode and a second zener diode, the cathode of the first zener diode and the anode of the second zener diode are both electrically connected to the second connection end, the anode of the first zener diode is electrically connected to the ground end, and the cathode of the second zener diode is electrically connected to the overvoltage protection circuit.

[0024] Optionally, the control module is also used to control the working state of the liquid-cooled charging gun according to the liquid leakage state.

[0025] In a second aspect, an embodiment of the present invention provides a liquid-cooled charging system, including a liquid-cooled charging gun and a charging pile;

[0026] The liquid-cooled charging gun comprises the liquid leakage detection system according to any one of the first aspects;

[0027] The liquid-cooled charging gun is communicatively connected to the charging pile.

[0028] The embodiment of the present invention provides a liquid leakage detection system for a liquid-cooled charging gun, which is arranged in the liquid-cooled charging gun. The liquid leakage detection system includes a liquid leakage detection module, a liquid leakage detection circuit and a control module; wherein the liquid leakage detection module is used to receive liquid leakage; the liquid leakage detection circuit is used to transmit a reference detection signal to the liquid leakage detection module and receive a liquid leakage signal output by the liquid leakage detection module; the control module then receives the liquid leakage signal and determines the liquid leakage state according to the liquid leakage signal. Based on the liquid leakage detection module, the liquid leakage detection circuit and the control module in the liquid leakage detection system, the liquid leakage state is determined in time to eliminate the existence of safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required to describe the embodiments. Obviously, the drawings introduced are only drawings of a part of the embodiments to be described in the present invention, rather than all the drawings. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a structural schematic diagram of a liquid leakage detection system provided by an embodiment of the present invention;

[0031] Figure 2 is a structural schematic diagram of another liquid leakage detection system provided by an embodiment of the present invention;

[0032] Figure 3 is a structural schematic diagram of another liquid leakage detection system provided by an embodiment of the present invention;

[0033] Figure 4 It is a structural schematic diagram of a liquid-cooled charging system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be fully described below in combination with the drawings in the embodiments of the present invention through specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work fall within the protection scope of the present invention.

[0035] The embodiment of the present invention provides a liquid leakage detection system for a liquid-cooled charging gun. Figure 1 is a structural diagram of a liquid leakage detection system provided by an embodiment of the present invention, such as Figure 1 As shown, the leakage detection system 100 is arranged in the liquid-cooled charging gun 10, and the leakage detection system 100 includes a leakage detection module 200, a leakage detection circuit 300 and a control module 400; the leakage detection module 200 is used to receive leakage; the leakage detection circuit 300 is electrically connected to the leakage detection module 200, and is used to transmit a reference detection signal to the leakage detection module 200 and receive a leakage signal output by the leakage detection module 200, and the leakage signal is different under different leakage states; the control module 400 is electrically connected to the leakage detection circuit 300, and is used to receive the leakage signal and determine the leakage state according to the leakage signal.

[0036] Specifically, the liquid-cooled charging gun 10 is a connection device for high-power charging stations to charge cars. The liquid-cooled charging gun 10 contains a refrigerant to avoid the problem of heat damage to the device due to excessive power. In addition, the refrigerant is a conductive liquid. If the refrigerant leaks, there will be safety hazards. Furthermore, if it rains or snows, snow water and other substances leak into the liquid-cooled charging gun 10, there will also be safety hazards. A leakage detection system 100 is set in the liquid-cooled charging gun 10, which can detect the leakage status of the weak points where the liquid-cooled charging gun 10 contacts the car interface, thereby improving safety and stability.

[0037] Specifically, the leakage detection module 200 in the embodiment of the present invention is a leakage detection circuit board, which is arranged at the weak point of leakage in the connector part of the liquid-cooled charging gun 10, and is used to receive and collect leakage. After the leakage detection circuit 300 transmits the reference detection signal to the leakage detection module 200, due to the different conductivity of different liquids, the electrical signal fed back to the leakage detection circuit 300 by the leakage detection module 200 is different. The electrical signal is transmitted to the control module 400 after being processed by the leakage detection circuit 300. The control module 400 determines the leakage situation and / or distinguishes the type of leakage according to the received electrical signal.

[0038] Among them, the liquid leakage detection system 100 includes a liquid leakage detection module 200, a liquid leakage detection circuit 300 and a control module 400. The liquid leakage detection module 200 is used to obtain liquid leakage. Exemplarily, the liquid leakage can be a conductive refrigerant or water. The embodiment of the present invention does not specifically limit the material of the liquid leakage. The liquid leakage detection circuit 300 outputs a reference detection signal to the liquid leakage detection module 200, and the liquid leakage detection module 200 outputs a liquid leakage signal to the liquid leakage detection circuit 300 based on the obtained reference detection signal and the current liquid leakage state. Further, the liquid leakage state at least includes a water leakage state, a refrigerant leakage state and a non-leakage state, and different liquid leakage signals are output based on the liquid leakage state. The control module 400 is electrically connected to the liquid leakage detection circuit 300, and determines different liquid leakage states based on different liquid leakage signals received by the liquid leakage detection circuit 300.

[0039] Exemplarily, when the liquid leakage state is a water leakage state, that is, the liquid leakage detection module 200 is used to obtain the current water leakage. The liquid leakage detection circuit 300 outputs a reference detection signal to the liquid leakage detection module 200, and the liquid leakage detection module 200 outputs a water leakage signal to the liquid leakage detection circuit 300 based on the obtained reference detection signal and the current water leakage state. The control module 400 then determines that there is a current water leakage based on the water leakage signal obtained by the liquid leakage detection circuit 300.

[0040] Exemplarily, when the leakage state is a refrigerant leakage state, the leakage detection module 200 is used to obtain the refrigerant leakage currently flowing. The leakage detection circuit 300 outputs a reference detection signal to the leakage detection module 200, and the leakage detection module 200 outputs a refrigerant leakage signal to the leakage detection circuit 300 based on the obtained reference detection signal and the current refrigerant leakage state. The control module 400 then determines that there is a refrigerant leakage flow situation based on the refrigerant leakage signal obtained by the leakage detection circuit 300.

[0041] Exemplarily, when the liquid leakage state is a non-leakage state, that is, the liquid leakage detection module 200 does not obtain the current leaking liquid. The liquid leakage detection circuit 300 outputs a reference detection signal to the liquid leakage detection module 200, and the liquid leakage detection module 200 outputs a non-leakage signal to the liquid leakage detection circuit 300 based on the obtained reference detection signal and the current non-leakage state. The control module 400 then determines that the current situation is a non-leakage situation based on the non-leakage signal obtained by the liquid leakage detection circuit 300.

[0042] In summary, the leakage detection system provided by the embodiment of the present invention is arranged in the liquid-cooled charging gun, and the leakage detection system includes a leakage detection module, a leakage detection circuit and a control module; the leakage detection circuit is used to transmit a reference detection signal to the leakage detection module and receive a leakage signal output by the leakage detection module; the control module then receives the leakage signal and determines the leakage state according to the leakage signal. Based on the leakage detection module, the leakage detection circuit and the control module in the leakage detection system, the leakage state is determined in time, and the material of the leakage is judged based on different leakage signals, thereby fundamentally eliminating safety hazards.

[0043] Figure 2 is a schematic diagram of another liquid leakage detection system provided by an embodiment of the present invention, referring to Figure 2 As shown, the leakage detection circuit 300 includes a reference circuit 310 and a detection circuit 320; the leakage detection module 200 includes a first connection terminal 200A and a second connection terminal 200B; the reference circuit 310 is electrically connected to the first connection terminal 200A, and is used to transmit a reference voltage detection signal to the leakage detection module 200 through the first connection terminal 200A; the detection circuit 320 is electrically connected to the second connection terminal 200B, and is used to receive the leakage voltage signal output by the leakage detection module 200 through the second connection terminal 200B.

[0044] The leakage detection circuit 300 includes a reference circuit 310 and a detection circuit 320. The reference circuit 310 is used to provide a reference detection signal to the leakage detection module 200, and the detection circuit 320 is used to transmit the leakage signal generated by the leakage detection module 200. The generation and transmission of the leakage signal are ensured by connecting the leakage detection module 200 with the reference circuit 310 and the detection circuit 320, that is, the control module 400 can determine the leakage state based on the leakage signal received by the leakage detection circuit 300.

[0045] Specifically, the leakage detection module 200 includes a first connection terminal 200A and a second connection terminal 200B, and the reference voltage detection signal generated by the reference circuit 310 is transmitted to the leakage detection module 200 through the first connection terminal 200A, and the leakage voltage signal is transmitted to the detection circuit 320 through the second connection terminal 200B. The control module 400 is electrically connected to the leakage detection circuit 300, and the control module 400 determines the leakage state based on the leakage voltage signal received by the detection circuit 320 to prevent safety hazards.

[0046] Continue to refer Figure 2 As shown, the detection circuit 320 includes a constant current detection subcircuit 321 ; the constant current detection subcircuit 321 is electrically connected to the second connection terminal 200B, and the leakage detection circuit 300 outputs a leakage voltage signal with a constant current based on the constant current detection subcircuit 321 .

[0047] Among them, the detection circuit 320 includes a constant current detection subcircuit 321, which is used to adjust the detection circuit 320 to output a stable current. The constant current detection subcircuit 321 is electrically connected to the second connection terminal 200B of the leakage detection module 200. Based on the constant current detection subcircuit 321, the leakage signal output by the second connection terminal 200B can be converted into a leakage voltage signal with a constant current, that is, the control module 400 can judge the leakage state by the change of the voltage signal to prevent safety hazards. By adding the constant current detection subcircuit 321, it is ensured that the leakage detection system 100 is more stable and the judged leakage state is more stable.

[0048] Continue to refer Figure 2 As shown, the detection circuit 320 includes an amplifying sub-circuit 322 ; the amplifying sub-circuit 322 is arranged in series between the second connection terminal 200B and the control module 400 , and is used to amplify the leakage voltage signal and transmit the amplified leakage voltage signal to the control module 400 .

[0049] The detection circuit 320 includes an amplifying subcircuit 322, which is used to amplify the signal transmitted to the detection circuit 320 to ensure the stability of the transmitted signal. Specifically, the amplifying subcircuit 322 is located between the second connection terminal 200B and the control module 400, and the leakage voltage signal transmitted by the second connection terminal 200B is amplified by the amplifying subcircuit 322. The control module 400 receives the amplified leakage voltage signal, and the leakage situation of the leakage detection system 100 is judged more accurately and stably.

[0050] Figure 3 is a schematic diagram of another liquid leakage detection system provided by an embodiment of the present invention, referring to Figure 2 and Figure 3 As shown, the reference circuit 310 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a reference chip K; the first end of the first resistor R1 and the first end of the first capacitor C1 are both electrically connected to the power supply terminal V, the second end of the first resistor R1 is respectively electrically connected to the first end of the reference chip K and the first end of the second resistor R2, the second end of the reference chip K is respectively electrically connected to the second end of the second resistor R2 and the first end of the third resistor R3, the third end of the reference chip K, the second end of the third resistor R3 and the second end of the first capacitor C1 are all electrically connected to the ground terminal.

[0051] Specifically, the reference circuit 310 converts the voltage provided by the power supply terminal V into a reference voltage through the first resistor R1, the second resistor R2, the third resistor R3, the first capacitor C1 and the reference chip K. The reference circuit 310 is electrically connected to the first connection terminal 200A, which ensures that the leakage detection module 200 obtains the reference voltage detection signal through the first connection terminal 200A.

[0052] Specifically, in the reference circuit 310, the first resistor R1 and the first capacitor C1 are electrically connected to the power supply terminal V, and the first resistor R1, the second resistor R2, and the third resistor R3 are electrically connected to the three ports of the reference chip K, respectively. At the same time, in the reference circuit 310, the first capacitor C1, the third resistor R3, and one end of the reference chip K are all grounded, and the first resistor R1, the second resistor R2, and one end of the reference chip K are all electrically connected to the first connection terminal 200A, so as to transmit the reference voltage detection signal to the leakage detection module 200.

[0053] Continue to refer Figure 2 and Figure 3 As shown, the constant current detection subcircuit 321 includes a fourth resistor R4, a fifth resistor R5, a first transistor Q1 and a second transistor Q2; the first end of the fourth resistor R4 is electrically connected to the first connection end 200A, the second end of the fourth resistor R4 is electrically connected to the control end of the first transistor Q1 and the input end of the second transistor Q2, respectively, the input end of the first transistor Q1 is electrically connected to the second connection end 200B, the output end of the first transistor Q1 is electrically connected to the control end of the second transistor Q2 and the first end of the fifth resistor R5, respectively, and the output end of the second transistor Q2 and the second end of the fifth resistor R5 are electrically connected to the ground end.

[0054] Specifically, the constant current detection subcircuit 321 ensures a constant current between the first connection terminal 200A and the second connection terminal 200B through the fourth resistor R4, the fifth resistor R5, the first transistor Q1 and the second transistor Q2. That is, it is ensured that the leakage detection circuit 300 can output different leakage voltage signals with constant current at the second connection terminal 200A only by changing the voltage signal, that is, only when the first connection terminal 200A and the second connection terminal 200B are connected to different leakage states, different resistance values ​​are generated, and the leakage voltage signal with changes is output based on the constant current to judge the leakage situation.

[0055] Specifically, in the constant current detection subcircuit 321, the fourth resistor R4 is electrically connected to the first connection terminal 200A, and the input terminal of the first transistor Q1 is electrically connected to the second connection terminal 200B, that is, the constant current detection subcircuit 321 is connected to the leakage detection module 200. The constant current detection subcircuit 321 adjusts the output stable current, that is, the leakage detection circuit 300 outputs a voltage change signal based on the leakage state to transmit the leakage signal. Among them, the output end of the first transistor Q1 is electrically connected to the control end of the second transistor Q2, and the output end of the second transistor Q2 is electrically connected to the fifth resistor R5. When the first transistor Q1 is turned on, the second transistor Q2 is controlled to be turned on, and the second transistor Q2 controls the voltage across the fifth resistor R5 to be constant, that is, it can ensure that the constant current detection subcircuit 321 adjusts the output stable current.

[0056] Continue to refer Figure 2 and Figure 3 As shown, the amplifier subcircuit 322 includes a follower unit 322A and an operational amplifier unit 322B; the non-inverting input terminal of the follower unit 322A is electrically connected to the second connection terminal 200B, the inverting input terminal of the follower unit 322A is electrically connected to the ground terminal, the output terminal of the follower unit 322A is electrically connected to the non-inverting input terminal of the operational amplifier unit 322B, the inverting input terminal of the operational amplifier unit 322B is electrically connected to the ground terminal, and the output terminal of the operational amplifier unit 322B is electrically connected to the control module 400.

[0057] Among them, the amplification sub-circuit 322 includes a follower unit 322A and an operational amplifier unit 322B, the follower unit 322A is electrically connected to the second connection terminal 200B, and the operational amplifier unit 322B is electrically connected to the control module 400. The leakage voltage signal is amplified by the follower unit 322A and the operational amplifier unit 322B and then transmitted to the control module 400, ensuring that the control module 400 judges the leakage situation based on a more accurate and clear leakage voltage signal.

[0058] Continue to refer Figure 2 and Figure 3 As shown, the leakage detection circuit 300 also includes a surge protection module 330; the surge protection module 330 includes a first Zener diode Q3 and a second Zener diode Q4, the cathode of the first Zener diode Q3 and the anode of the second Zener diode Q4 are both electrically connected to the second connection terminal 200B, the anode of the first Zener diode Q3 is electrically connected to the ground terminal, and the cathode of the second Zener diode Q4 is electrically connected to the overvoltage protection circuit.

[0059] The leakage detection circuit 300 further includes an anti-surge module 330, and the stability and reliability of the leakage detection circuit 300 are ensured by setting the anti-surge module 330. The anti-surge module 330 includes a first voltage regulator diode Q3 and a second voltage regulator diode Q4, and the first voltage regulator diode Q3 and the second voltage regulator diode Q4 are used to prevent the generation of interference signals and affect the leakage voltage signal transmitted by the second connection terminal 200B.

[0060] Optional, reference Figure 3 As shown, the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the sixth resistor R6 provided in the leakage detection circuit 300 can prevent the generation of surge current and maintain the stability of the leakage detection circuit 300. Figure 3 As shown, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11 may be peripheral components in the amplifying sub-circuit 322 to ensure stable amplification and transmission of the signal.

[0061] Continue to refer Figures 1 to 3 As shown, the control module 400 is also used to control the working state of the liquid-cooled charging gun 10 according to the leakage state.

[0062] Among them, the control module 400 controls the working state of the liquid-cooled charging gun 10 based on the judged leakage state. Specifically, when the control module 400 judges that the leakage state is a water leakage state, the control module 400 controls the liquid-cooled charging gun 10 to stop working to avoid dangerous situations. When the control module 400 judges that the leakage state is a refrigerant leakage state, the control module 400 controls the liquid-cooled charging gun 10 to stop working to avoid dangerous situations. When the control module 400 judges that the leakage state is a non-leakage state, the control module 400 controls the liquid-cooled charging gun 10 to continue working.

[0063] Based on the same inventive concept, an embodiment of the present invention further provides a liquid-cooled charging system. Figure 4 is a schematic diagram of a liquid cooling charging system provided by an embodiment of the present invention, with reference to Figure 4 A liquid-cooled charging system 1 is shown, comprising a liquid-cooled charging gun 10 and a charging pile 20; the liquid-cooled charging gun 10 comprises a leakage detection system 100; the liquid-cooled charging gun 10 and the charging pile 20 are communicatively connected.

[0064] The liquid-cooled charging system 1 includes a liquid-cooled charging gun 10 and a charging pile 20. The charging pile 20 charges a car or the like through the liquid-cooled charging gun 10. The liquid-cooled charging gun 10 includes a leakage detection system 100. The leakage detection system determines the leakage state. If leakage is determined, the charging pile 20 is controlled to stop supplying power through the communication connection between the liquid-cooled charging gun 10 and the charging pile 20, thereby ensuring the safety and stability of the liquid-cooled charging system 1.

[0065] The above is the core idea of ​​the present invention. The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A liquid leakage detection system for a liquid-cooled charging gun, characterized in that: The liquid leakage detection system is arranged in the liquid-cooled charging gun, and the liquid leakage detection system comprises a liquid leakage detection module, a liquid leakage detection circuit and a control module; The liquid leakage detection module is used to receive the liquid leakage; The leakage detection circuit is electrically connected to the leakage detection module, and is used to transmit a reference detection signal to the leakage detection module and receive a leakage signal output by the leakage detection module, wherein the leakage signal is different under different leakage states; The control module is electrically connected to the liquid leakage detection circuit, and is used to receive the liquid leakage signal and determine the liquid leakage state according to the liquid leakage signal; After the leakage detection circuit transmits a reference detection signal to the leakage detection module, due to the different electrical conductivities of different liquids, the electrical signal fed back to the leakage detection circuit by the leakage detection module is different. The electrical signal is processed by the leakage detection circuit and then transmitted to the control module. The control module determines the leakage situation and distinguishes the type of leakage based on the received electrical signal.

2. The liquid leakage detection system according to claim 1, characterized in that: The leakage detection circuit includes a reference circuit and a detection circuit; The liquid leakage detection module includes a first connection end and a second connection end; The reference circuit is electrically connected to the first connection end, and is used to transmit a reference voltage detection signal to the leakage detection module through the first connection end; The detection circuit is electrically connected to the second connection end, and is used for receiving the leakage voltage signal output by the leakage detection module through the second connection end.

3. The liquid leakage detection system according to claim 2, characterized in that: The detection circuit includes a constant current detection subcircuit; The constant current detection subcircuit is electrically connected to the second connection end, and the leakage detection circuit outputs a leakage voltage signal with a constant current based on the constant current detection subcircuit.

4. The liquid leakage detection system according to claim 2, characterized in that: The detection circuit includes an amplification subcircuit; The amplifying sub-circuit is arranged in series between the second connecting end and the control module, and is used to amplify the leakage voltage signal and transmit the amplified leakage voltage signal to the control module.

5. The liquid leakage detection system according to claim 2, characterized in that: The reference circuit includes a first resistor, a second resistor, a third resistor, a first capacitor and a reference chip; The first end of the first resistor and the first end of the first capacitor are both electrically connected to the power supply end, the second end of the first resistor is respectively electrically connected to the first end of the reference chip and the first end of the second resistor, the second end of the reference chip is respectively electrically connected to the second end of the second resistor and the first end of the third resistor, the third end of the reference chip, the second end of the third resistor and the second end of the first capacitor are all electrically connected to the ground end.

6. The liquid leakage detection system according to claim 3, characterized in that: The constant current detection subcircuit comprises a fourth resistor, a fifth resistor, a first triode and a second triode; The first end of the fourth resistor is electrically connected to the first connection end, the second end of the fourth resistor is electrically connected to the control end of the first transistor and the input end of the second transistor respectively, the input end of the first transistor is electrically connected to the second connection end, the output end of the first transistor is electrically connected to the control end of the second transistor and the first end of the fifth resistor respectively, and the output end of the second transistor and the second end of the fifth resistor are electrically connected to the ground end.

7. The liquid leakage detection system according to claim 4, characterized in that: The amplification sub-circuit comprises a follower unit and an operational amplification unit; The non-inverting input terminal of the follower unit is electrically connected to the second connection terminal, the inverting input terminal of the follower unit is electrically connected to the ground terminal, the output terminal of the follower unit is electrically connected to the non-inverting input terminal of the operational amplifier unit, the inverting input terminal of the operational amplifier unit is electrically connected to the ground terminal, and the output terminal of the operational amplifier unit is electrically connected to the control module.

8. The liquid leakage detection system according to claim 2, characterized in that: The leakage detection circuit also includes a surge protection module; The surge protection module includes a first zener diode and a second zener diode, the cathode of the first zener diode and the anode of the second zener diode are both electrically connected to the second connection end, the anode of the first zener diode is electrically connected to the ground end, and the cathode of the second zener diode is electrically connected to the overvoltage protection circuit.

9. The liquid leakage detection system according to claim 1, characterized in that: The control module is also used to control the working state of the liquid-cooled charging gun according to the liquid leakage state.

10. A liquid-cooled charging system, characterized in that: Including liquid-cooled charging gun and charging pile; The liquid-cooled charging gun comprises a liquid leakage detection system according to any one of claims 1 to 9; The liquid-cooled charging gun is communicatively connected to the charging pile.

Images