CN218569889U

CN218569889U - Charging control circuit

Info

Publication number: CN218569889U
Application number: CN202223154151.1U
Authority: CN
Inventors: 何兴; 李忠志; 张高源; 赵斌良; 杜素青
Original assignee: Changsha Zoomlion Environmental Industry Co Ltd
Current assignee: Changsha Zoomlion Environmental Industry Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-03-03
Anticipated expiration: 2032-11-25

Abstract

The utility model discloses a charge control circuit, wherein, the circuit includes: the charging system comprises a low-voltage storage battery, a mechanical main switch, a DC-DC power module, a charging pile auxiliary power supply and a vehicle control unit, wherein the mechanical main switch comprises a movable contact, a static closing contact and a static opening contact, the movable contact is connected with a vehicle power supply cable, the static opening contact is connected with the charging pile auxiliary power supply, and the static closing contact is connected with the low-voltage storage battery; the charging pile auxiliary power supply is respectively connected with the vehicle control unit and the awakening end of the DC-DC power module; the output end of the DC-DC power module is connected with a power supply cable of the whole vehicle; the vehicle control unit is connected with the DC-DC power module and is provided with a signal receiving end, and the signal receiving end is connected with the mechanical master switch. Therefore, on the basis of not changing the existing structure of the vehicle, the normal charging of the vehicle can be realized under the condition that the mechanical main switch is switched off, so that the vehicle transformation cost is reduced, the feeding of a low-voltage storage battery is avoided, and a user does not need to pay attention to the charging condition all the time.

Description

Charging control circuit

Technical Field

The utility model relates to a vehicle technical field that charges especially relates to a charge control circuit.

Background

Currently, the vehicle charging process of the related art specifically includes the following steps: 1) The vehicle and the charging pile are physically connected, and the voltage of a low-voltage storage battery of the whole vehicle is normal, so that corresponding power supply voltage is provided for a charging related controller; 2) The charging pile works normally, CAN communication is normal, direct current output is normal, and a low-voltage auxiliary power supply CAN be normally provided so as to wake up a charging related controller; 3) And finishing handshaking and parameter configuration according to a charging communication protocol required by national standard GBT27930-2015, and entering formal charging.

However, the related art has a problem that in actual use, a situation that a user forgets to turn off a mechanical master switch, so that a low-voltage battery feeding occurs after the vehicle is charged, affects the use of the vehicle, and requires the user to pay attention to the charging condition all the time.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving one of the technical problems in the related art at least to a certain extent. Therefore, the utility model aims to provide a charge control circuit can realize the normal charge of vehicle under the condition of machinery master switch disconnection on the basis that does not change the current structure of vehicle to reduce the vehicle and reform transform the cost, and avoid the low pressure battery feed, need not the user and pay close attention to the situation of charging constantly, can use the scene more extensive.

In order to achieve the above object, the utility model provides a charge control circuit, include: the charging pile control system comprises a low-voltage storage battery, a mechanical main switch, a DC-DC power module, a charging pile auxiliary power supply and a vehicle control unit, wherein the mechanical main switch comprises a movable contact, a static closing contact and a static opening contact, the movable contact is connected with a vehicle power supply cable, the static opening contact is connected with the charging pile auxiliary power supply, and the static closing contact is connected with the low-voltage storage battery; the charging pile auxiliary power supply is respectively connected with the vehicle control unit and the awakening end of the DC-DC power module and is used for awakening the vehicle control unit and the DC-DC power module when the charging pile is in charging connection with a vehicle charging port; the output end of the DC-DC power module is connected with the finished automobile power supply cable and is used for supplying low-voltage power to the finished automobile; the vehicle control unit is connected with the DC-DC power module and provided with a signal receiving end, the signal receiving end is connected with the mechanical main switch, the vehicle control unit respectively acquires the on-off state of the mechanical main switch and the working state of the DC-DC power module when being awakened, and controls the charging control circuit to charge the vehicle according to the on-off state and the working state.

According to the utility model discloses a charge control circuit, through the static disconnection contact in with the machinery master switch with fill electric pile auxiliary power source and link to each other, and will fill electric pile auxiliary power source and link to each other with the end of awakening up of vehicle control unit and DC-DC power module respectively, and then fill electric pile and vehicle charging mouth and carry out charging connection, utilize and fill electric pile auxiliary power source and awaken up vehicle control unit and DC-DC power module, and vehicle control unit acquires the on-off state of machinery master switch and the operating condition of DC-DC power module respectively when awakening up, and charge for whole car according to on-off state and operating condition control charge control circuit. Therefore, on the basis of not changing the existing structure of the vehicle, the normal charging of the vehicle can be realized under the condition that the mechanical main switch is disconnected, so that the vehicle transformation cost is reduced, the low-voltage storage battery is prevented from feeding, the charging condition is not required to be concerned by a user at any time, and the applicable scene is wider.

In addition, according to the present invention, the charging control circuit can further have the following additional technical features:

in some examples, a terminal is externally connected to the static disconnection contact, and the static disconnection contact of the mechanical master switch is respectively connected to the charging pile auxiliary power supply and a signal receiving end of the vehicle control unit through the terminal.

In some examples, the circuit further comprises: the charging pile comprises a mechanical main switch and a charging pile auxiliary power supply, and further comprises a first current limiting unit and a second current limiting unit, wherein the first current limiting unit is arranged between the mechanical main switch and a finished automobile power supply cable, and the second current limiting unit is arranged between the mechanical main switch and the charging pile auxiliary power supply.

In some examples, the first current limiting unit includes: one end of the first fuse is connected with the whole vehicle power supply cable, and the other end of the first fuse is connected with the mechanical master switch.

In some examples, the second current limiting unit includes: the charging pile comprises a second fuse and a third fuse, wherein one end of the second fuse is connected with the charging pile auxiliary power supply, the other end of the second fuse is connected with one end of the third fuse, and the other end of the third fuse is connected with the mechanical master switch.

In some examples, the current ratings of the second fuse and the third fuse are each 10A.

In some examples, the circuit further comprises: and the anode of the diode is connected with the static disconnection contact, and the cathode of the diode is connected with the third fuse.

In some examples, the diode is a schottky diode.

In some examples, the vehicle control unit is further provided with an enable signal output end, the DC-DC power module is provided with an enable end, and the enable signal output end of the vehicle control unit is connected with the enable end of the DC-DC power module, wherein the vehicle control unit is configured to input an enable signal to the enable end through the enable signal output end when the movable contact is connected with the static disconnection contact.

In some examples, the vehicle control unit is further provided with a voltage detection terminal, and the voltage detection terminal is connected to the low-voltage storage battery and is used for acquiring a battery remaining amount of the low-voltage storage battery and controlling the DC-DC power module to stop charging the low-voltage storage battery according to the battery remaining amount.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a block schematic diagram of a charge control circuit according to an embodiment of the present invention;

fig. 2 is an electrical schematic diagram of a charge control circuit according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The charge control circuit according to an embodiment of the present invention is described below with reference to the drawings.

Fig. 1 is a block diagram of a charge control circuit according to an embodiment of the present invention.

As shown in fig. 1, in some embodiments of the present invention, the charging control circuit includes: the system comprises a low-voltage storage battery 1, a mechanical main switch 2, a DC-DC power module 3, a charging pile auxiliary power supply 4 and a vehicle control unit 5.

Specifically, as shown in fig. 2, the mechanical main switch 2 includes a movable contact, a static closing contact (ON end) and a static opening contact (OFF end), wherein the movable contact is connected to a power supply cable of the entire vehicle, the static opening contact (OFF end) is connected to the charging pile auxiliary power supply 4, and the static closing contact (ON end) is connected to the low-voltage battery 1; the charging pile auxiliary power supply 4 is respectively connected with the vehicle control unit 5 and the awakening end of the DC-DC power module 3 and is used for awakening the vehicle control unit 5 and the DC-DC power module 3 when the charging pile is in charging connection with a vehicle charging port; the output end of the DC-DC power module 3 is connected with a power supply cable of the whole vehicle and is used for supplying power to the whole vehicle at low voltage; the vehicle control unit 5 is connected with the DC-DC power module 3, the vehicle control unit 5 is provided with a signal receiving end R, and the signal receiving end R is connected with the mechanical main switch 2, wherein the vehicle control unit 5 respectively acquires the switch state of the mechanical main switch 2 and the working state of the DC-DC power module 3 when being awakened, and controls the charging control circuit to charge the vehicle according to the switch state and the working state.

It can be understood that, controlling the charging control circuit to charge the entire vehicle according to the switch state and the working state may specifically include: and controlling the work of other high-power low-voltage electric appliances of the whole vehicle according to the switching state of the mechanical main switch 2 and the working state of the DC-DC power module 3, for example, prohibiting the work of the high-power low-voltage electric appliances such as a water pump and a fan before the DC-DC power module 3 does not work normally.

After the DC-DC power module 3 works normally, the DC-DC power module 3 (i.e., the DC-DC shown in fig. 2) may provide corresponding working power sources for the vehicle control unit 5 (i.e., the VCU shown in fig. 2) and other vehicle-mounted low-voltage electric devices (i.e., the BMS shown in fig. 2 or other devices) through the vehicle supply cable, respectively, so as to ensure the normal work of the vehicle control unit 5 and other vehicle-mounted low-voltage electric devices.

The utility model discloses a combine below the specific embodiment, it is right the utility model discloses a charge control circuit's charge mode carries out corresponding explanation, wherein, charge mode includes normal charge mode and fills electric pile auxiliary power source charge mode:

specifically, in a normal charging mode, when a movable contact of the mechanical main switch 2 is connected with a static closed contact (ON end) (that is, the mechanical main switch 1 is in a closed state), the low-voltage power supply of the whole vehicle can be performed by the low-voltage storage battery 1, the DC-DC power module 3 and the whole vehicle controller 5 are awakened by the charging pile auxiliary power supply 4, and after the whole vehicle controller 5 enables the DC-DC power module 3 to normally work, the low-voltage power supply of the whole vehicle is performed by the DC-DC power module 3, the whole vehicle enters normal charging, after the charging is finished, the DC-DC power module 3 stops working, and the whole vehicle enters a dormant state, at this time, because the mechanical main switch 1 is still in the closed state, if the low-voltage battery of the whole vehicle is not closed or the static current is too large, the feeding of the low-voltage storage battery 1 is easy to occur.

Therefore, in the embodiment of the present invention, in the charging mode of the charging pile auxiliary power supply, when the movable contact of the mechanical main switch 2 is connected to the static OFF contact (OFF end) (i.e. the mechanical main switch 1 is in the OFF state), the charging pile auxiliary power supply 4 can replace the low-voltage battery 1 to perform low-voltage power supply on the whole vehicle, and simultaneously wake up the DC-DC power module 3 and the whole vehicle controller 5, and after the whole vehicle controller 5 enables the DC-DC power module 3 to normally work, the DC-DC power module 3 performs low-voltage power supply on the whole vehicle, the whole vehicle enters normal charging, after the charging is completed, the DC-DC power module 3 stops working, the whole vehicle enters the sleep state, at this moment, because the mechanical main switch 1 is in the OFF state, the feeding of the low-voltage battery 1 is effectively avoided, the charging situation is not required to be paid attention to the user at any moment, and the applicable scene is more extensive.

It should be noted that, in the above embodiment of the present invention, the vehicle control unit 5 is provided with the signal receiving end R, and may be used to acquire the on-off state of the mechanical main switch 2 when the vehicle control unit 5 is awakened, and control the DC-DC power module 3 to charge the low-voltage battery 1 according to the operating state.

Further, in some embodiments of the present invention, the static disconnection contact (OFF terminal) is externally connected with a terminal, and the static disconnection contact (OFF terminal) of the mechanical master switch is connected to the signal receiving terminal of the charging pile auxiliary power supply and the vehicle control unit through the terminal.

Particularly, in the embodiment of the utility model discloses an it has the terminal to go out at mechanical master switch 2's static disconnection contact (OFF end), and then, can link to each other mechanical master switch 2's static disconnection contact (OFF end) and charging pile auxiliary power supply 4 through this terminal, so that charging pile auxiliary power supply 4 carries out whole car low pressure power supply through the movable contact that mechanical master switch 2 links to each other and static disconnection contact (OFF end), and simultaneously, can also link to each other mechanical master switch 2's static disconnection contact (OFF end) and vehicle control unit 5's signal reception end R through this terminal, so that vehicle control unit 5 passes through signal reception end R and acquires mechanical master switch 2's on-OFF state.

Further, as shown in fig. 2, in some embodiments of the present invention, the charging control circuit further includes: a first current limiting unit 7 and a second current limiting unit 8.

Wherein, first current limiting unit 7 sets up between mechanical master switch 2 and whole car power supply cable, and second current limiting unit 8 sets up between mechanical master switch 2 and charging pile auxiliary power source 4.

Particularly, in the embodiment of the utility model, can restrict whole car power supply cable output to the electric current size of machinery master switch 2 through the first current limiting unit 7 unit that sets up between machinery master switch 2 and whole car power supply cable, and can restrict charging pile auxiliary power supply output to machinery master switch 2's electric current size through the second current limiting unit 8 that sets up between machinery master switch 2 and charging pile auxiliary power supply 4, thereby realize the overload protection to whole car power supply cable through first current limiting unit 7, and realize the overload protection to charging pile auxiliary power supply 4 through second current limiting unit 8.

Further, as shown in fig. 2, in some embodiments of the present invention, the first current limiting unit 7 includes: the safety fuse device comprises a first safety fuse FU1, wherein one end of the first safety fuse FU1 is connected with a power supply cable of the whole vehicle, and the other end of the first safety fuse FU1 is connected with a mechanical master switch 2.

Particularly, in the embodiment of the utility model, when the electric current that flows through first fuse FU1 was greater than first fuse FU 1's rated current, first fuse FU1 will fuse, and then can break off whole car power supply cable and be connected with mechanical master switch 2 to the realization is to the overload protection of whole car power supply cable.

Further, as shown in fig. 2, in some embodiments of the present invention, the second current limiting unit 8 includes: second fuse FU2 and third fuse FU3, wherein, second fuse FU 2's one end with fill electric pile auxiliary power source 4 and link to each other, second fuse FU 2's the other end links to each other with third fuse FU 3's one end, and third fuse FU 3's the other end links to each other with mechanical master switch 2.

Particularly, in the embodiment of the utility model, when second fuse FU2 is greater than second fuse FU 2's rated current when flowing through, second fuse FU2 will fuse, perhaps, when third fuse FU3 is greater than third fuse FU 3's rated current when flowing through, third fuse FU3 will fuse, and then can break off and fill being connected of electric pile auxiliary power supply 4 and mechanical master switch 2 to the realization is to filling electric pile auxiliary power supply 4's overload protection.

Further, in some embodiments of the present invention, the current rating of the second fuse FU2 and the third fuse FU3 are both 10A.

It should be understood that, because the rated current of the DC charging port specified by the existing national standard is 20A, and the auxiliary power supply 4 of the charging pile supplies power to the whole vehicle at low voltage and wakes up the whole vehicle controller 5 and the DC-DC power module 3 to adopt a parallel structure, therefore, in the embodiment of the present invention, the second fuse FU2 with a current rated value of 10A can be set in the connecting branch of the wake-up ends of the auxiliary power supply 4 of the charging pile and the whole vehicle controller 5 and the DC-DC power module 3, and the third fuse FU3 with a current rated value of 10A can be set in the connecting branch of the auxiliary power supply 4 of the charging pile and the mechanical main switch 2, thereby realizing the overload protection of the auxiliary power supply 4 of the charging pile.

Further, as shown in fig. 2, in some embodiments of the present invention, the charging control circuit further includes: and a diode D, wherein the anode of the diode D is connected to the static disconnection contact, and the cathode of the diode D is connected to the third fuse FU 3.

Particularly, in the embodiment of the utility model discloses a can be through setting up the diode between mechanical master switch 2's static disconnection contact and third fuse FU3 to prevent DC-DC power module 3's voltage through diode D and flow backward to filling in electric pile auxiliary power source 4, in order to avoid filling electric pile auxiliary power source 4's damage, promote the reliability of charging control circuit.

Further, in some embodiments of the present invention, the diode D is a schottky diode.

Specifically, in this embodiment of the present invention, the diode D may preferably be a schottky diode, and may further preferably be a schottky diode MBR2045CT with a maximum repeatable reverse voltage of 40V and a maximum forward average rectified current of 10A.

Further, as shown in fig. 2, in some embodiments of the present invention, the vehicle control unit 5 is further provided with an enable signal output end SN +, the DC-DC power module 3 is provided with an enable end SN, the enable signal output end SN + of the vehicle control unit 5 is connected to the enable end SN of the DC-DC power module 3, wherein the vehicle control unit 5 is configured to input an enable signal to the enable end SN through the enable signal output end SN + when the moving contact is connected to the static disconnection contact (OFF end).

Particularly, in the embodiment of the present invention, when the vehicle control unit 5 receives the on-OFF state of the mechanical main switch 2 through the signal receiving terminal R and determines that the movable contact in the mechanical main switch 2 is connected to the static OFF contact (OFF terminal) according to the on-OFF state of the mechanical main switch 2, the vehicle control unit may input the enable signal to the enable terminal SN of the DC-DC power module 3 through the enable signal output terminal SN + to control the DC-DC power module 3 to charge the low-voltage battery 1.

It can be understood that in the above embodiments of the present invention, in the process of enabling the DC-DC power module 3 at the vehicle control unit 5, the work of the low-voltage electric devices such as the water pump, the oil pump, the thermal management unit, and the air conditioner can also be prohibited simultaneously, until the mechanical master switch 2 is detected to be in the off state, the voltage of the low-voltage storage battery is greater than the preset voltage threshold (for example, 27V), and after the DC-DC power module has worked, the work of the low-voltage electric devices such as the water pump, the oil pump, the thermal management unit, and the air conditioner is allowed, so as to ensure that the working current of the low-voltage electric devices is less than the maximum current limit of the charging pile auxiliary power supply 4, for example, the maximum current limit can be 10A.

Further, as shown in fig. 2, in some embodiments of the present invention, the vehicle control unit 5 is further provided with a voltage detection terminal Vc, and the voltage detection terminal Vc is connected to the low-voltage battery 1 for obtaining the battery residual capacity of the low-voltage battery 1, and controlling the DC-DC power module 3 to stop charging the low-voltage battery 1 according to the battery residual capacity.

Particularly, in the embodiment of the utility model discloses a vehicle control unit 5 is through enabling signal output end SN + to DC-DC power module 3's enabling end SN input enable signal, and control DC-DC power module 3 is the low voltage battery 1 back of charging, can also acquire low voltage battery 1's battery surplus through voltage detection end Vc to when low voltage battery 1's battery surplus is greater than predetermineeing the electric quantity threshold value (for example, predetermine the electric quantity threshold value and be 80%), can control DC-DC power module 3 to stop to charge for low voltage battery 1, make the vehicle get into normal charging flow.

To sum up, according to the utility model discloses a charge control circuit, through with the static disconnection contact in the mechanical master switch with fill electric pile auxiliary power source and link to each other to fill electric pile auxiliary power source and link to each other with the end of awakening up of vehicle control unit and DC-DC power module respectively, and then, fill electric pile and vehicle charging mouth and carry out charging connection, utilize and fill electric pile auxiliary power source and awaken up vehicle control unit and DC-DC power module, and vehicle control unit acquires the on-off state of mechanical master switch and the operating condition of DC-DC power module respectively when awakening up, and charges for whole car according to on-off state and operating condition control charge control circuit. Therefore, on the basis of not changing the existing structure of the vehicle, the normal charging of the vehicle can be realized under the condition that the mechanical main switch is disconnected, so that the vehicle transformation cost is reduced, the low-voltage storage battery is prevented from feeding, the charging condition is not required to be concerned by a user at any time, and the applicable scene is wider.

It should be understood that reference throughout this specification to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A charge control circuit, the circuit comprising: a low-voltage storage battery, a mechanical main switch, a DC-DC power module, a charging pile auxiliary power supply and a vehicle control unit, wherein,

the mechanical master switch comprises a movable contact, a static closing contact and a static opening contact, wherein the movable contact is connected with a power supply cable of the whole vehicle, the static opening contact is connected with the charging pile auxiliary power supply, and the static closing contact is connected with the low-voltage storage battery;

the charging pile auxiliary power supply is respectively connected with the vehicle controller and the awakening end of the DC-DC power module and is used for awakening the vehicle controller and the DC-DC power module when the charging pile is in charging connection with a vehicle charging port;

the output end of the DC-DC power module is connected with the finished automobile power supply cable and is used for supplying low-voltage power to the finished automobile;

the vehicle control unit is connected with the DC-DC power module and provided with a signal receiving end, the signal receiving end is connected with the mechanical main switch, the vehicle control unit respectively acquires the on-off state of the mechanical main switch and the working state of the DC-DC power module when being awakened, and controls the charging control circuit to charge the whole vehicle according to the on-off state and the working state.

2. The charging control circuit according to claim 1, wherein a terminal is externally connected to the static disconnection contact, and the static disconnection contact of the mechanical master switch is respectively connected to the charging pile auxiliary power supply and a signal receiving terminal of the vehicle control unit through the terminal.

3. The charge control circuit of claim 1, wherein the circuit further comprises: the charging pile comprises a first current limiting unit and a second current limiting unit, wherein the first current limiting unit is arranged between a mechanical main switch and a finished automobile power supply cable, and the second current limiting unit is arranged between the mechanical main switch and a charging pile auxiliary power supply.

4. The charge control circuit of claim 3, wherein the first current limiting unit comprises: one end of the first fuse is connected with the finished automobile power supply cable, and the other end of the first fuse is connected with the mechanical master switch.

5. The charge control circuit of claim 3, wherein the second current limiting unit comprises: the charging pile comprises a first fuse and a second fuse, wherein one end of the first fuse is connected with the charging pile auxiliary power supply, the other end of the first fuse is connected with one end of the second fuse, and the other end of the second fuse is connected with the mechanical main switch.

6. The charge control circuit of claim 5, wherein the second fuse and the third fuse each have a current rating of 10A.

7. The charge control circuit of claim 5, further comprising: and the anode of the diode is connected with the static disconnection contact, and the cathode of the diode is connected with the third fuse.

8. The charge control circuit of claim 7, wherein the diode is a schottky diode.

9. The charging control circuit according to claim 1, wherein the vehicle control unit is further provided with an enable signal output terminal, the DC-DC power module is provided with an enable terminal, and the enable signal output terminal of the vehicle control unit is connected to the enable terminal of the DC-DC power module, wherein the vehicle control unit is configured to input an enable signal to the enable terminal through the enable signal output terminal when the movable contact is connected to the static disconnection contact.

10. The charging control circuit according to claim 9, wherein the vehicle control unit is further provided with a voltage detection terminal, and the voltage detection terminal is connected to the low-voltage battery and is configured to obtain a battery remaining capacity of the low-voltage battery and control the DC-DC power module to stop charging the low-voltage battery according to the battery remaining capacity.