CN213341260U

CN213341260U - Integrated high-voltage distribution box of electric automobile

Info

Publication number: CN213341260U
Application number: CN202021617108.2U
Authority: CN
Inventors: 马杰; 袁中; 何俊; 朱凯; 陶征东; 高辉; 梁宇航
Original assignee: Chery Commercial Vehicle Anhui Co Ltd
Current assignee: Wuhu Tairui Automobile Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-06-01
Anticipated expiration: 2030-08-06

Abstract

The utility model discloses an electric automobile integrated form high voltage distribution box, the distribution box includes the box set up the DCDC module that is used for charging for on-vehicle battery in the box, power battery is connected through the high-pressure connector that sets up on the box to the input of DCDC module, the output of DCDC module passes through the low pressure plug connector and connects on-vehicle battery. The utility model has the advantages that: the DCDC is integrated in the distribution box, so that the integration level of the distribution box is increased, the space interest rate is improved, and the space is saved for the arrangement of other parts in the vehicle; the control panel for heating the PTC is further integrated in the distribution box, so that the integration level of the distribution box is further improved; and after the integration, the control modules of the PTC and the DCDC are protected by the box body, so that the control modules can run more safely and reliably.

Description

Integrated high-voltage distribution box of electric automobile

Technical Field

The utility model relates to a car high voltage distribution box, in particular to electric automobile integrated form high voltage distribution box.

Background

The new energy automobile adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and forms an automobile with advanced technical principle, new technology and new structure. Common new energy automobile mainly provides main power source by battery system, and entire system's energy transmission transmits through high-voltage wire harness, and distribution box among the prior art mainly contains components and parts such as fuse, contactor, current sensor, insulation detector, pre-charge resistance, copper tablet, high-voltage connector, and its integrated level is lower, and the function is single, and space utilization is low moreover.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide an electric automobile integrated form high voltage distribution box, with the DCDC charging control module integration of vehicle-mounted battery in current distribution box for distribution box function after the integration increases, has promoted space utilization.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an electric automobile integrated form high voltage distribution box, the distribution box includes the box set up the DCDC module that is used for charging for on-vehicle battery in the box, the power battery is connected through the high-voltage connector who sets up on the box to the input of DCDC module, the on-vehicle battery is connected through low pressure plug connector to the output of DCDC module.

The DCDC module is including being used for carrying out the step-down circuit and the control chip that change to voltage, the control input end of step-down circuit is connected to the control chip output, high-pressure plug connector is connected to the input of step-down circuit, low pressure plug connector is connected to the output of step-down circuit.

The control chip is connected with a whole vehicle VCU through a can network, and the whole vehicle VCU detects the voltage of the vehicle-mounted storage battery and sends a charging starting instruction according to the voltage.

And the control chip is respectively connected with the timer and the vehicle state sensor.

Still the integration sets up PTC heating main control board in the distribution box, including main control chip and IGBT module on the PTC heating main control board, the control end of IGBT module is connected to main control chip's output, power battery is connected through the high voltage connector who sets up on the box body to the input of IGBT module, the output of IGBT module is connected the heating assembly through the low pressure connector who sets up on the box body, the heating assembly is used for heating the water tank, main control chip passes through CAN communication interface on the box body and connects external sensor.

The high-voltage distribution box is provided with an air cooling system.

And a plurality of cooling fins are arranged on the box body of the high-voltage distribution box.

The utility model has the advantages that: the DCDC is integrated in the distribution box, so that the integration level of the distribution box is increased, the space interest rate is improved, and the space is saved for the arrangement of other parts in the vehicle; the control panel for heating the PTC is further integrated in the distribution box, so that the integration level of the distribution box is further improved; and after the integration, the control modules of the PTC and the DCDC are protected by the box body, so that the control modules can run more safely and reliably.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

fig. 1 is a schematic diagram of the distribution box after the DCDC module is integrated;

fig. 2 is a schematic diagram of the integrated PTC heating main control plate structure of the present invention.

The labels in the above figures are: 1. a box body; 2. a DCDC module; 3. a high-voltage plug connector; 4. a low voltage plug connector; 5. ptc heating the master control board; 6. a high voltage connector; 7. a low voltage connector;

Detailed Description

The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.

The main purpose of this application has integrateed DCDC module and PTC liquid heating assembly in the distribution box, improves the integrated level of distribution box, improves space utilization, reduces external occupation space such as external DCDC, PTC heating control panel simultaneously, and does not have the problem of protection such as anticollision.

Definition of high voltage distribution box: a high-voltage power distribution cabinet (box/case) of a new energy electric vehicle is a high-voltage large-current distribution unit PDU of all pure electric vehicles and plug-in hybrid electric vehicles. Adopt centralized distribution scheme, structural design is compact, and the wiring overall arrangement is convenient, overhauls convenient and fast. According to the system architecture requirements of different customers, the high-voltage distribution box is also integrated with a part of intelligent control management units of the battery management system, so that the complexity of the whole vehicle system architecture power distribution is further simplified. The high-voltage distribution box comprises a box body and a box cover arranged on the box body, wherein the box body is connected with a connecting end interface; the connecting end interface comprises a direct-current power supply positive connecting port, a PTC connecting port, a direct-current power supply negative connecting port, an air conditioner connecting port, a motor controller negative connecting port, a motor controller positive connecting port, a low-voltage control connecting port, a direct-current voltage conversion port, a main positive relay and a plurality of copper bars.

On the basis of above high voltage distribution box, the integrated DCDC module that is used for on-vehicle battery charging specifically includes: the vehicle-mounted storage battery charging box is characterized in that a DCDC module used for charging a vehicle-mounted storage battery is arranged in the box body, the input end of the DCDC module is connected with a power battery through a high-voltage connector arranged on the box body, and the output end of the DCDC module is connected with the vehicle-mounted storage battery through a low-voltage connector.

The DCDC module comprises a voltage reduction circuit and a control chip, wherein the voltage reduction circuit is used for converting voltage, the control chip is generally realized by adopting controllers such as a single chip microcomputer, and specific different DCDC chips adopt different integrated controllers. The control input end of the voltage reduction circuit is connected to the output end of the control chip, the Buck circuit can be adopted by the voltage reduction circuit, the Buck circuit is driven to conduct through the control chip, the high-voltage plug connector is connected to the input end of the voltage reduction circuit, and the low-voltage plug connector is connected to the output end of the voltage reduction circuit. Buck circuit carries to on-vehicle battery through the connector after converting the high pressure to the low pressure to for the battery power supply. In this application with DCDC module integration in the block terminal, concrete position and the fixed mode of setting up in the box all can adopt prior art common mode to realize connected mode through newly-increased connector on the box body.

The control chip is connected with a vehicle VCU through a can network, and the vehicle controller VCU detects the voltage of the vehicle-mounted storage battery and sends a charging starting instruction according to the voltage. The control chip is respectively connected with the timer and the vehicle state sensor. The control chip integrated in the vehicle is connected with each part outside the box body through a communication interface, the communication interface is added on the box body and used for connecting the control chip and external equipment, and the communication interface is connected with a VCU of the vehicle controller through a CAN bus of the vehicle. The control signals of the VCU are acquired by communicating with the VCU. The vehicle state sensor is mainly used for detecting the running state of the vehicle, an engine sensor can be adopted, the timer is used for calculating the time after the engine stops running, and the DCDC module is automatically started by the control chip to charge part of points for the vehicle-mounted storage battery after the time reaches the set time.

Because a large number of original components and control systems on the vehicle all use 12V power, a device is necessary to charge the storage battery so as to ensure sufficient electric quantity for the vehicle to use, and the DCDC direct-current power supply conversion module can convert high-voltage electricity of a power battery, which is higher than 300V, into 12V direct-current constant voltage for the vehicle to use. During the use of the vehicle, the VCU can monitor the voltage of the storage battery at any time, and once the voltage of the storage battery is detected to be lower than 14V, the DCDC can be started immediately to charge the storage battery and provide the electric quantity required by a low-voltage system. When the vehicle is not started, the low-voltage system still has a power demand, and the battery power is insufficient. And after the vehicle is continuously stopped for four days, starting the DCDC module, charging the storage battery, working for 30min, and closing the DCDC system. If the battery management system detects that the electric quantity of the power battery is less than 10%, the DCDC module is stopped to work so as to protect the performance of the power battery,

in a preferred embodiment, the inside of the distribution box is further provided with a PTC heating main control board, the PTC heating main control board comprises a main control chip and an IGBT module, the output end of the main control chip is connected with the control end of the IGBT module, the input end of the IGBT module is connected with the power battery through a high-voltage connector arranged on the box body, the output end of the IGBT module is connected with a heating assembly through a low-voltage connector arranged on the box body, the heating assembly is used for heating the water tank, and the main control chip is connected with an external sensor through a CAN communication interface on the box body. The external sensor is mainly a temperature sensor and the like, and is used for controlling basic data of heating for a main control chip on a main control board and communicating with an external controller to receive control of other controllers. The utility model provides a communication and control of main control board after the integration can be realized to the fixed side of this application ptc main control board in the distribution box adoption common mode and set up corresponding connector interface, communication interface on the box.

As shown in fig. 2, the schematic diagram of the main control board is shown, and the specific structure and fixing manner of the PCB board disposed in the power distribution box are all the prior art, which is not further limited herein. The PTC liquid heating assembly mainly comprises a high-voltage connector, a low-voltage connector, a main control board, a water tank, a PTC heating assembly, a water inlet pipe, a water outlet pipe, a water tank and a heating seat. The main control board sets up in the box, and all the other sets up like external according to actual conditions, and car battery high voltage alternating current passes through high-voltage connector and receives the main control board, and the IGBT module on the main control board becomes the direct current of given voltage to the alternating current of power supply side, and the PTC heating package subassembly is received to the direct current through high-voltage electricity intercommunication adaptor, and heating element sets up in the heating element groove, and the water tank below is arranged in to the heating groove, through heating element with heat conduction PTC heating element groove, makes the temperature of water in the water tank rise. The heating seat and the water tank are arranged below the high-pressure box body, the water tank is provided with a water inlet pipe and a water outlet pipe, and a sealing ring is arranged at the joint of the water tank and the heating seat.

In another preferred embodiment, because of the addition of integrated components, the temperature in the distribution box may further rise, a cooling system needs to be added, the whole high-voltage box adopts air-cooled heat dissipation, the temperature in the box body is reduced through air convection, and a plurality of cooling fin structures are arranged at the bottom and the side of the box body, so that the dissipation of the working heat in the box body can be accelerated, the high-voltage distribution box can work at the temperature meeting the working requirements during working, the internal circuit is prevented from being ablated due to overhigh temperature, and the internal electrical elements are invalid.

The air-cooled heat dissipation system comprises heat dissipation holes formed in the box body of the distribution box, the heat dissipation holes are communicated with the inner space and the outer space of the distribution box, the heat dissipation holes are formed in different shell surfaces of the box body, a fan is arranged on one of the shell surfaces, the wind direction blown by the fan is blown to the inside from the outside of the box body, and therefore the wind is blown out of the box body by taking away heat. The control of the fan is controlled through a fan controller, the fan controller is connected with a temperature sensor, the temperature sensor is arranged in the power distribution box, the internal temperature of the temperature sensor is obtained and sent to the fan controller, and the fan controller controls the power supply of the fan to control the work of the fan.

The utility model integrates DCDC in the distribution box, which increases the integration level of the distribution box, improves the space interest rate and saves the space for the arrangement of other parts in the vehicle; the control panel for heating the PTC is further integrated in the distribution box, so that the integration level of the distribution box is further improved; and after the integration, the control modules of the PTC and the DCDC are protected by the box body, so that the control modules can run more safely and reliably. Meanwhile, air cooling heat dissipation is added, the defect that heat is increased due to the fact that electric control is not available is overcome, temperature is reduced faster, and the risk of temperature increase of a distribution box caused by the fact that heating components are added is avoided.

It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.

Claims

1. The utility model provides an electric automobile integrated form high voltage distribution box, the distribution box includes the box, its characterized in that: a DCDC module used for charging the vehicle-mounted storage battery is arranged in the box body, the input end of the DCDC module is connected with the power battery through a high-voltage connector arranged on the box body, and the output end of the DCDC module is connected with the vehicle-mounted storage battery through a low-voltage connector;

2. The integrated high-voltage distribution box for electric vehicles according to claim 1, wherein: the DCDC module is including being used for carrying out the step-down circuit and the control chip that change to voltage, the control input end of step-down circuit is connected to the control chip output, high-pressure plug connector is connected to the input of step-down circuit, low pressure plug connector is connected to the output of step-down circuit.

3. The integrated high-voltage distribution box for electric vehicles according to claim 2, wherein: the control chip is connected with a whole vehicle VCU through a can network, and the whole vehicle VCU detects the voltage of the vehicle-mounted storage battery and sends a charging starting instruction according to the voltage.

4. An electric vehicle integrated high voltage distribution box according to claim 2 or 3, wherein: and the control chip is respectively connected with the timer and the vehicle running state sensor.

5. The integrated high-voltage distribution box for electric vehicles according to claim 1, wherein: the high-voltage distribution box is provided with an air cooling system.

6. The integrated high voltage distribution box of an electric vehicle of claim 5, wherein: and a plurality of cooling fins are arranged on the box body of the high-voltage distribution box.