CN217545142U

CN217545142U - Intelligent charging socket for electric vehicle

Info

Publication number: CN217545142U
Application number: CN202220498434.9U
Authority: CN
Inventors: 吴慧
Original assignee: Yueqing Kehui Hengye Electronics Factory
Current assignee: Yueqing Kehui Hengye Electronics Factory
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-10-04
Anticipated expiration: 2032-03-09

Abstract

The utility model discloses an intelligent charging socket for electric motor car, including casing and socket port, be equipped with the double-sided circuit board in the casing, the integration has the singlechip on the double-sided circuit board, DC-DC voltage conversion circuit, relay J1, charger voltage detection circuit, the opposite detection circuitry of charger polarity, plug detection circuit, relay contact protection circuit, storage battery voltage detection circuit, charging current detection circuit, storage battery temperature detection circuit, plug temperature detection circuit and ambient temperature detection circuit all are connected with the singlechip, realize intellectual detection, safe charging, avoid taking place danger, and simple to operate, good compatibility.

Description

Intelligent charging socket for electric vehicle

Technical Field

The utility model relates to an intelligent technical field of electric motor car, concretely relates to intelligent charging socket for electric motor car.

Background

With the continuous development of the times, the electric vehicle becomes an indispensable vehicle for people's daily life, and with the continuous development of scientific technology and the increasing demands of people, the electric vehicle becomes more intelligent and multifunctional, wherein the improvement of the electric vehicle charging socket is not slow, and the safety of the electric vehicle charging socket is a very concern of people. For example, children often insert metal foreign matters such as keys into the charging port, which causes serious short circuit and ignition danger; some chargers have abnormal charging voltage and current due to quality problems or damage, so that the service life of a storage battery is shortened, even the storage battery is damaged or the temperature rises to cause danger; poor contact caused by aging of a charger plug, or insulator melting caused by temperature rise of the plug, even danger caused by short circuit; the storage battery is aged, and the danger is generated due to charging heating expansion. Aiming at the problems, an intelligent safety socket needs to be designed urgently, dangerous situations are avoided as far as possible, and a storage battery is charged with one more safety guarantee.

Disclosure of Invention

The utility model mainly relates to a solve the not enough problem of electric motor car socket security that charges, provide an intelligent charging socket for electric motor car, including double-sided circuit board, the integration has the singlechip on the double-sided circuit board, DC-DC voltage conversion circuit, relay J1, charger voltage detection circuitry, the opposite detection circuitry of charger polarity, plug detection circuitry, relay contact protection circuit, storage battery voltage detection circuitry, charging current detection circuitry, storage battery temperature detection circuitry, plug temperature detection circuitry and ambient temperature detection circuitry, realize intellectual detection system, safe charging, avoid taking place danger, and simple to operate, it is compatible good.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an intelligent charging socket for electric motor car, includes casing and socket port, be equipped with double-sided circuit board in the casing, the integration has singlechip, DC-DC voltage conversion circuit, relay J1, charger voltage detection circuit, the opposite detection circuitry of charger polarity, plug detection circuit, relay contact protection circuit, storage battery voltage detection circuit, charging current detection circuit, storage battery temperature detection circuit, plug temperature detection circuit and ambient temperature detection circuit on the double-sided circuit board, electric motor car end charger is all connected to the first end of charger voltage detection circuit, the first end of the opposite detection circuitry of charger polarity, storage battery voltage detection circuit's first end, the first end of charger polarity, electric motor car end charger, the second end of charger voltage detection circuitry's second end, the second end of the opposite detection circuitry of charger polarity, storage battery voltage detection circuitry all with the singlechip is connected. The utility model provides an intelligent charging socket for electric motor car, including casing and socket port, be equipped with the double-sided circuit board in the casing, the integrated singlechip that has on the double-sided circuit board, DC-DC voltage converting circuit, relay J1, prevent joining diode D4, charger voltage detection circuitry, charger polarity opposite detection circuitry, plug detection circuitry, relay contact protection circuit, storage battery voltage detection circuitry, charging current detection circuitry, LED pilot lamp state and fault indication circuit, storage battery temperature detection circuitry, plug temperature detection circuitry and ambient temperature detection circuitry, LED pilot lamp state and fault indication circuit include red LED and green LED, DC-DC voltage converting circuit, relay J1, charger voltage detection circuitry, charger polarity opposite detection circuitry, plug detection circuitry, relay contact protection circuitry, storage battery voltage detection circuitry, charging current detection circuitry, LED pilot lamp state and fault indication circuitry, storage battery temperature detection circuitry, plug temperature detection circuitry and ambient temperature detection circuitry all are connected with the singlechip; the charger voltage detection circuit, the charger polarity reversal detection circuit and the battery jar voltage detection circuit are all connected with the electric vehicle end charger; the plug detection circuit is connected between the charger voltage detection circuit and the battery voltage detection circuit; the relay contact protection circuit is connected in parallel at two ends of the relay J1; the positive pole of the reverse connection prevention diode D4 is connected with the positive pole of the storage battery, and the negative pole of the reverse connection prevention diode D4 is connected with the DC-DC voltage conversion circuit; the charging current detection circuit is connected with the current alloy sampling resistor. The intelligent detection design of the utility model can charge the storage battery more and safely guarantee, avoid danger and effectively prolong the service life of the storage battery; the installation is convenient, and the original charging socket can be replaced at the original position; compatible with most of the existing universal chargers.

Preferably, the first end of the plug detection circuit is connected with the charger voltage detection circuit, the second end of the plug detection circuit is connected with the storage battery voltage detection circuit, and the third end of the plug detection circuit is connected with the single chip microcomputer. The plug detection circuit is used for detecting conductive foreign matters inserted into the socket, when the conductive foreign matters are detected, the relay J1 is not attracted, so that voltage is not output to avoid short circuit, and the red LED and the green LED flash alternately to give an alarm.

Preferably, the relay contact protection circuit is connected in parallel at two ends of the relay J1, and the relay contact protection circuit is further connected with the single chip microcomputer. Because the universal intelligent charging socket is designed, considering that part of chargers are not isolated at the output end but directly connected with a large capacitor in parallel, in order to avoid the phenomenon that the contact point of the relay J1 is shortened due to the fact that the large current is generated in the instant of actuation of the relay J1, a relay contact point protection circuit is designed, namely, two ends of the contact point of the relay J1 are connected with a protection circuit consisting of a field effect tube and a high-power resistor in parallel.

Preferably, one end of the charging current detection circuit is connected with the single chip microcomputer, and the other end of the charging current detection circuit is connected with the current alloy sampling resistor. The service life of the battery can be shortened even the battery is damaged by the excessive charging current, so that whether the charging current is excessive or not is detected during charging, the current is excessive but does not reach a preset limit value, the emergency charging is started for 30 minutes, the red LED is started to flash slowly, and the charging is stopped after 30 minutes; when the current exceeds a predetermined limit, the charging will be immediately turned off and the red LED flash turned on. When the charging is finished, the charging current is gradually reduced under the normal condition, and when the charging current detection circuit detects that the current is not reduced, the protection is triggered.

Preferably, the storage battery temperature detection circuit, the plug temperature detection circuit and the environment temperature detection circuit are all connected with the single chip microcomputer. 3 thermistors are arranged in the circuit, and one thermistor is used for measuring the current environment temperature and is used as a reference point for the temperature rise of a plug and a storage battery and for adjusting the floating charge time; the other plug temperature is measured, the plug temperature is too high due to poor contact and other reasons, and the plug insulator can be melted under extreme conditions to cause the danger of short circuit of the positive electrode and the negative electrode; and the other one is externally attached to a storage battery to detect the current temperature of the storage battery.

Preferably, an LED indicating lamp state and fault indicating circuit is further integrated on the double-sided circuit board and connected with the single chip microcomputer. The LED indicator light status and fault indication circuit comprises a red LED and a green LED for warning and status indication.

Preferably, a reverse connection prevention diode D4 is further integrated on the double-sided circuit board, the positive electrode of the reverse connection prevention diode D4 is connected with the positive electrode of the storage battery, and the negative electrode of the reverse connection prevention diode D4 is connected with the DC-DC voltage conversion circuit and then connected with the single chip microcomputer. Because the voltage of the storage battery has larger variation range along with the use and charging processes, and in order to reduce energy consumption, a DC-DC voltage conversion chip is adopted in a power supply part, so that the working voltage of the circuit reaches 7-85V, and an anti-reverse diode D4 is designed to be used as a protection circuit for preventing the reverse connection of positive and negative electrodes.

Preferably, the relay J1 is connected with the single chip microcomputer. And the single chip microcomputer controls the working state of the relay J1 according to the detection result.

Therefore, the utility model has the advantages that:

(1) Intelligent detection and safe charging are realized, danger is avoided, and the service life of the storage battery is effectively prolonged;

(2) The installation is convenient, and the original charging socket can be replaced at the original position;

(3) Compatible with most of the existing universal chargers.

Drawings

Fig. 1 is a circuit diagram of an intelligent charging socket for an electric vehicle in an embodiment of the present invention.

Fig. 2 is a circuit diagram of a DC-DC voltage conversion circuit according to an embodiment of the present invention.

Fig. 3 is a circuit diagram of the charger voltage detection circuit and the charger polarity reversal detection circuit in the embodiment of the present invention.

Fig. 4 is a circuit diagram of the plug detection circuit and the relay contact protection circuit in the embodiment of the present invention.

Fig. 5 is the circuit diagram of the embodiment of the utility model provides an in storage battery voltage detection circuit and LED pilot lamp state and fault indication circuit.

Fig. 6 is a circuit diagram of the charging current detection circuit in the embodiment of the present invention.

Fig. 7 is the embodiment of the utility model provides an in the embodiment circuit diagram of storage battery temperature detect circuit, plug temperature detect circuit and ambient temperature detect circuit.

Fig. 8 is a circuit diagram of the cpu circuit according to the embodiment of the present invention.

1. The device comprises a single chip microcomputer 2, a DC-DC voltage conversion circuit 3, an ambient temperature detection circuit 4, a current alloy sampling resistor 5, a charger voltage detection circuit 6, a charger polarity reversal detection circuit 7, a plug detection circuit 8, a relay contact protection circuit 9, a storage battery voltage detection circuit 10, a charging current detection circuit 11, an LED indicator lamp state and fault indication circuit 12, a storage battery temperature detection circuit 13 and a plug temperature detection circuit.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

An intelligent charging socket for an electric vehicle comprises a shell and a socket port, wherein a double-sided circuit board is arranged in the shell, a single chip microcomputer 1, a DC-DC voltage conversion circuit 2, a relay J1, an anti-reverse connection diode D4, a charger voltage detection circuit 5, a charger polarity reverse detection circuit 6, a plug detection circuit 7, a relay contact protection circuit 8, a battery voltage detection circuit 9, a charging current detection circuit 10, an LED indicator lamp state and fault indication circuit 11, a battery temperature detection circuit 12, a plug temperature detection circuit 13 and an environment temperature detection circuit 3 are integrated on the double-sided circuit board, as shown in figure 1, the LED indicator lamp state and fault indication circuit 11 comprises a red LED and a green LED, the DC-DC voltage conversion circuit 2, the relay J1, the charger voltage detection circuit 5, the charger polarity reverse detection circuit 6, the plug detection circuit 7, the relay contact protection circuit 8, the battery voltage detection circuit 9, the charging current detection circuit 10, the LED indicator lamp state and fault indication circuit 11, the battery temperature detection circuit 12, the plug temperature detection circuit 13 and the environment temperature detection circuit 3 are connected with the single chip microcomputer 1; the charger voltage detection circuit 5, the charger polarity reversal detection circuit 6 and the battery jar voltage detection circuit 9 are all connected with an electric vehicle end charger; the plug detection circuit 7 is connected between the charger voltage detection circuit 5 and the battery jar voltage detection circuit 9; the relay contact point protection circuit 8 is connected in parallel at two ends of the relay J1; the positive pole of the reverse connection prevention diode D4 is connected with the positive pole of the storage battery, and the negative pole of the reverse connection prevention diode D4 is connected with the DC-DC voltage conversion circuit 2; the charging current detection circuit 10 is connected with the current alloy sampling resistor 4.

As shown in fig. 2, the DC-DC voltage conversion circuit 2 includes a resistor R20, an electrolytic capacitor C5, a 7-85V voltage conversion chip IC2, an inductor L1, a diode D5, a resistor R21, a resistor R22, a capacitor C6, and an electrolytic capacitor C7. As shown in fig. 3, the charger voltage detection circuit 5 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a capacitor C1; the charger polarity reversal detection circuit 6 includes a diode D1, a resistor R5, a resistor R6, and a transistor Q1. As shown in fig. 4, the plug detection circuit 7 includes a diode D8, a resistor R32, a resistor R9, a resistor R10, and a transistor Q2; the relay contact protection circuit 8 comprises a diode D2, a resistor R7, a MOS transistor Q3 and a resistor R8. As shown in fig. 5, the battery voltage detection circuit 9 includes a capacitor C4, a resistor R19, a resistor R18, and a resistor R17; the LED indicator light status and fault indication circuit 11 includes a resistor R26, an LED1 (green LED), a resistor R27, and an LED2 (red LED). As shown in fig. 6, the charging current detection circuit 10 includes a capacitor C3, a resistor R16, a chip IC3, a resistor R15, a resistor R14, a resistor R13, a capacitor C25, and a capacitor C2. As shown in fig. 7, the battery temperature detection circuit 12 includes a capacitor C8, a resistor R24, a resistor R23, and an SIP2; the plug temperature detection circuit 13 comprises a capacitor C9, a resistor R28 and a thermistor RX2; the ambient temperature detection circuit 3 includes a capacitor C10, a resistor R29, and a thermistor RX1. As shown in fig. 8, the single chip microcomputer 1 is a chip IC1, and the chip IC1, the resistor R31, the capacitor C13, the capacitor C11, and the electrolytic capacitor C12 form a central processing unit circuit.

Because the voltage of the storage battery has larger variation range along with the use and charging processes, and in order to reduce energy consumption, a DC-DC voltage conversion chip is adopted in a power supply part, so that the working voltage of the circuit reaches 7-85V, and an anti-reverse diode D4 is designed to be used as a protection circuit for preventing the reverse connection of positive and negative electrodes. The key positions of voltage sampling, current amplification and the like adopt 0.5-1% high-precision resistors, and the current sampling adopts a special current alloy sampling resistor 4 (with a low resistance value of 0.05 ohm), so that the voltage drop on the sampling resistor during charging can be reduced, and the error of voltage detection during charging is avoided. The amplifier of the charging current detection circuit 10 employs a high-precision operational amplifier. Because the universal intelligent charging socket is adopted, considering that part of chargers are not isolated at the output end but directly connected with a large capacitor, in order to avoid the phenomenon that the contact life of the relay J1 is shortened due to the large current generated in the moment of actuation of the relay J1, a relay contact protection circuit 8 is designed, namely, a protection circuit consisting of a field effect tube and a high-power resistor is connected in parallel with two ends of the contact of the relay J1. Before the relay J1 is started, the field effect transistor is started, the capacitor of the output part of the external charger is charged through the high-power resistor connected in series, and then the relay J1 is started. The core singlechip 1 adopts 6 way AD converters, detects the temperature value of current storage battery, plug, environment respectively to and the voltage value and the charging current value of charger input storage battery, and the theory of operation is: when the charger is plugged into the intelligent charging socket, the intelligent charging socket detects the voltage change, the green LED flashes to indicate that the charger is successfully plugged, the relay J1 is attracted, so that the charger can be directly connected to a storage battery, the current charging current is converted into a voltage signal through a 0.05 ohm current alloy sampling resistor 4 and a high-precision operational amplifier and is input into the singlechip 1, and if the charging current exists, the relay J1 is continuously attracted to carry out normal charging; if no charging current exists, the charger electric vehicle end (the intelligent charging socket end) is plugged but the commercial power end is not plugged, at the moment, the intelligent charging socket releases the relay J1 to detect whether the charger is pulled out, if the charger is not pulled out, the relay J1 is re-attracted within about 2 seconds and the charging current is continuously detected (the repeated process is once within about 3 seconds within 1 minute, once within 1 minute after 1 minute, and once within 1 minute if the charging current is not detected within 2 hours, the detection is closed for saving the power consumption and prolonging the service life of the relay J1). After the relay J1 is attracted, whether charging is started or not is confirmed through current detection, voltage and current are not output by some chargers at ordinary times, and a storage battery outputs voltage and current after giving a voltage signal to the charger first, so that the relay J1 is designed to be tentatively conducted every 3 seconds, and whether current output exists by the charger is judged. When the intelligent charging socket detects the charging current, the red LED is normally on, and normal charging is started. 3 thermistors are designed in the circuit, one thermistor is used for measuring the current environmental temperature and is used as a reference point for the temperature rise of a plug and a storage battery and for adjusting the floating charge time; the other plug temperature is measured, the plug temperature is too high due to poor contact and other reasons, and the plug insulator can be melted under extreme conditions to cause the danger of short circuit of the positive electrode and the negative electrode; and the other one is externally attached to a storage battery to detect the current temperature of the storage battery. The temperature rise of the plug and the battery jar is detected at any time in the charging process, if abnormity occurs, the charging is immediately stopped, and the current fault condition is informed through the flickering of the red LED for different times. The voltage rising rate of a battery and the current reduction rate when charging is about to be completed are detected in the charging process, if the voltage of the battery is not increased or is decreased instead when charging is not normal, namely normal current charging (the battery is heated and expands dangerously when charging current exists but the voltage of the battery is not increased), or the current is not reduced when charging is about to be completed, charging is stopped immediately, and the current fault condition is informed through flickering of a red LED for different times. The service life of the battery can be shortened even the battery is damaged by the excessive charging current, so that whether the charging current is excessive or not is detected during charging, the current is excessive but does not reach a preset limit value, the emergency charging is started for 30 minutes, the red LED is started to flash slowly, and the charging is stopped after 30 minutes; when the current exceeds a predetermined limit, the charging will be turned off immediately and the red LED flash turned on. The current battery voltage is detected at any time in the charging process, when the battery voltage is detected to exceed the limit value, the charging is stopped immediately, and the current fault condition is informed through the flickering of the red LED for different times. When the intelligent charging socket detects that the charger enters the floating charge, the floating charge time is adjusted according to the current air temperature, the red LED is closed, the green LED is opened and slowly flashes, the floating charge time reaches the disconnection relay J1, namely, the passage of the charger and the storage battery is disconnected, the charging is completed, the green LED is changed into normally bright state by slow flashing, and the green LED is extinguished until the charger is pulled out. The intelligent charging socket can self-check the self faults of the 3 temperature sensors at any time and inform the current fault situation through the flickering of the red LED for different times. When not having the charger to insert, detect at any time whether current socket has electrically conductive foreign matter to insert and arouse the short circuit when avoiding electrically conductive foreign matters such as key and produce danger. When the conductive foreign matter is detected, the relay J1 is not attracted, so that the voltage is not output to avoid short circuit, and the red LED and the green LED flash alternately to alarm. The intelligent charging socket can detect whether the polarity of the currently inserted charger is matched, if not, the non-attraction relay J1 is not charged, and the red LED and the green LED alternately flash and alarm. The intelligent charging socket is further designed with the longest charging time limit, and the charging limit time is automatically adjusted according to the current charging current. Charging is closed due to the fact that charging time is too long due to some abnormal reasons, the current fault condition is informed through flickering of the red LED for different times, and double protection is achieved.

The utility model discloses have following function: 1) Short circuit prevention of the socket: when children plug the metal conductor foreign matter into the socket, the socket automatically protects the socket from outputting voltage; 2) Reverse connection protection of the charger: when the polarity of the charger is opposite to that of the socket, the automatic protection is carried out; 3) And (3) poor contact protection: when the temperature of the plug rises due to poor contact of the charger plug, the temperature sensor is triggered to enter protection; 4) Protecting the battery from over-high temperature: when the temperature of the storage battery rises to exceed a preset value during charging, a temperature sensor is triggered to enter protection; 5) Charging voltage rising rate detection protection: when the battery is charged, the voltage of the battery slowly rises, does not rise or falls instead in unit time, and the battery automatically enters into protection; 6) Protection without charging current drop: when the charging is finished, the charging current is detected not to be reduced, and protection is triggered; 7) Protection of charging voltage overvoltage: when charging, the charging voltage exceeds the highest limit value, and automatic protection is realized; 8) And (3) excessive protection of charging current: when the current is too large but does not reach a preset limit value, starting 30-minute emergency charging, and immediately closing the charging when the current exceeds the preset limit value; 9) Charging maximum time limit: automatically setting the longest charging time according to the charging current of the charger, and automatically disconnecting the charger when the longest charging time is up; 10 Float time limit): after floating charging, automatically setting floating charging time according to the current air temperature; 11 Fault self-test: when the battery temperature sensor, the plug temperature sensor and the environment temperature sensor have faults, the red LED flickers. The utility model discloses the use: the electric vehicle end charger (plug) is plugged in first, the green LED of the intelligent charging socket flashes at the moment, the intelligent charging socket detects that the charger is plugged in, the relay J1 inside the intelligent charging socket repeatedly attracts, releases the action (once in about 3 seconds, turns into once in 1 minute after 60 seconds, does not detect any more after 2 hours, the plug needs to be pulled out and plugged again if charging is needed at the moment), the charger output current is waited, the commercial power end (AC power supply) is plugged in again, the red LED of the intelligent charging socket is bright after about 2 seconds, and charging is started. In the charging process, the intelligent charging socket can automatically detect the voltage rising rate, the current falling rate, the plug temperature, the battery temperature, the environment temperature, the charging current, the upper limit of the charging voltage and the charging time. When charging is to be completed, the charger is detected to enter a floating charging state, the green LED of the intelligent charging socket flickers and the floating charging timer is started, the floating charging time is changed according to the current air temperature, and the time of the sample is 1-1.5 hours. After the floating charging is finished, the green LED of the intelligent charging socket is normally on, and the charger is disconnected at the moment to finish the charging. Before pulling out the plug, pull out city electric socket end earlier, then pull out the plug, intelligent charging socket can red LED one after about 2 seconds twinkle, shows that intelligent charging socket has detected the charger and has pulled out. When the charger is not pulled out for a long time, the intelligent charging socket can detect the current battery voltage, and if the current battery voltage is lower than a preset value, the intelligent charging socket can automatically restart charging (which is an optional function and is started once in months).

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an intelligent charging socket for electric motor car, includes casing and socket port, its characterized in that, be equipped with double-sided circuit board in the casing, integrated on the double-sided circuit board have singlechip, DC-DC voltage conversion circuit, relay J1, charger voltage detection circuitry, the opposite detection circuitry of charger polarity, plug detection circuitry, relay contact protection circuit, storage battery voltage detection circuitry, charging current detection circuitry, storage battery temperature detection circuitry, plug temperature detection circuitry and ambient temperature detection circuitry, electric motor car end charger is all connected to charger voltage detection circuitry's first end, the opposite detection circuitry's of charger polarity first end, storage battery voltage detection circuitry's first end, charger voltage detection circuitry's second end, the opposite detection circuitry's of charger polarity second end, storage battery voltage detection circuitry's second end all with the singlechip is connected.

2. The intelligent charging socket for the electric vehicle as claimed in claim 1, wherein a first end of the plug detection circuit is connected with the charger voltage detection circuit, a second end of the plug detection circuit is connected with the battery voltage detection circuit, and a third end of the plug detection circuit is connected with the single chip microcomputer.

3. The intelligent charging socket for the electric vehicle according to claim 1, wherein the relay contact protection circuit is connected in parallel to two ends of the relay J1, and the relay contact protection circuit is further connected with the single chip microcomputer.

4. The intelligent charging socket for the electric vehicle according to claim 1, wherein one end of the charging current detection circuit is connected with the single chip microcomputer, and the other end of the charging current detection circuit is connected with the current alloy sampling resistor.

5. The intelligent charging socket for the electric vehicle as claimed in claim 1, wherein the battery temperature detection circuit, the plug temperature detection circuit and the ambient temperature detection circuit are all connected with the single chip microcomputer.

6. The intelligent charging socket for the electric vehicle according to claim 1, wherein an LED indicator light state and fault indication circuit is further integrated on the double-sided circuit board, and the LED indicator light state and fault indication circuit is connected with the single chip microcomputer.

7. The intelligent charging socket for the electric vehicle as claimed in claim 1, wherein a reverse-connection prevention diode D4 is further integrated on the double-sided circuit board, the anode of the reverse-connection prevention diode D4 is connected with the anode of a storage battery, and the cathode of the reverse-connection prevention diode D4 is connected with the single chip microcomputer after being connected with the DC-DC voltage conversion circuit.

8. The intelligent charging socket for the electric vehicle as claimed in claim 1 or 3, wherein the relay J1 is connected with the single chip microcomputer.