阅读说明：本技术 一种支持国标和欧标双枪充电的直流充电系统 (Direct current charging system supporting national standard and European standard double-gun charging ) 是由 彭富 李春晓 马秋香 覃记荣 黄国桂 杨泽华 曹永利 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种支持国标和欧标双枪充电的直流充电系统。该系统包括动力电池、电池管理装置、国标充电回路和欧标充电回路；动力电池与所述电池管理装置连接；国标充电回路包括第一国标充电回路和第二国标充电回路,第一国标充电回路和第二国标充电回路上分别对应设置有第一国标充电插座和第二国标充电插座；所述欧标充电回路包括第一欧标充电回路和第二欧标充电回路,所述第一欧标充电回路和第二欧标充电回路上分别对应设置有第一欧标充电插座和第二欧标充电插座；所述第一国标充电回路、第二国标充电回路、第一欧标充电回路和第二欧标充电回路均连接所述电池管理装置。本发明技术方案实现了既适用于国标双枪充电,又适用于欧标双枪充电。(The invention discloses a direct current charging system supporting national standard and European standard double-gun charging. The system comprises a power battery, a battery management device, a national standard charging loop and a European standard charging loop; the power battery is connected with the battery management device; the national standard charging circuit comprises a first national standard charging circuit and a second national standard charging circuit, and a first national standard charging socket and a second national standard charging socket are respectively and correspondingly arranged on the first national standard charging circuit and the second national standard charging circuit; the European standard charging loop comprises a first European standard charging loop and a second European standard charging loop, and a first European standard charging socket and a second European standard charging socket are correspondingly arranged on the first European standard charging loop and the second European standard charging loop respectively; the first national standard charging loop, the second national standard charging loop, the first European standard charging loop and the second European standard charging loop are all connected with the battery management device. The technical scheme of the invention is suitable for national standard double-gun charging and European standard double-gun charging.)

1. A direct current charging system supporting national standard and European standard double-gun charging is characterized by comprising a power battery, a battery management device, a national standard charging loop and an European standard charging loop;

the power battery is connected with the battery management device and is also connected to a main loop of the system;

the national standard charging circuit comprises a first national standard charging circuit and a second national standard charging circuit, and a first national standard charging socket and a second national standard charging socket are respectively and correspondingly arranged on the first national standard charging circuit and the second national standard charging circuit;

the European standard charging loop comprises a first European standard charging loop and a second European standard charging loop, and a first European standard charging socket and a second European standard charging socket are correspondingly arranged on the first European standard charging loop and the second European standard charging loop respectively;

the first national standard charging loop, the second national standard charging loop, the first European standard charging loop and the second European standard charging loop are all connected with the battery management device and are connected to the main loop in parallel.

2. The dc charging system according to claim 1, wherein the first national standard charging circuit, the second national standard charging circuit, the first european standard charging circuit, and the second european standard charging circuit are connected to the battery management device via a high voltage plug-in and a low voltage plug-in.

3. The dc charging system according to claim 2, wherein the first national standard charging circuit, the second national standard charging circuit, the first european standard charging circuit and the second european standard charging circuit are respectively provided with a positive relay and a negative relay.

4. The direct current charging system according to claim 3, wherein the primary circuit is provided with MSD and current sensors.

5. The direct current charging system according to claim 4, wherein the power battery is a single-path power type power battery or a dual-path power type power battery, and the dual-path power type battery is connected to a main circuit of the system in a parallel connection manner.

6. The direct current charging system for branch national standard and European standard double-gun charging according to claim 5, wherein the battery management device is connected with a liquid cooling loop, the liquid cooling loop comprises a liquid cooling device, a liquid cooling high-voltage positive relay and a main negative relay, and the liquid cooling high-voltage positive relay, the liquid cooling device and the main negative relay are sequentially connected in series; the high-voltage interface of the liquid cooling device is connected with the battery management device and the main loop;

the BMS in the battery management device controls the opening and closing of the liquid cooling high-voltage positive relay, and the liquid cooling device controls the opening and closing of the main negative relay.

7. The direct current charging system according to claim 6, wherein the BMS supplies power to the liquid cooling device and controls the power type power battery to be in a preset temperature range by controlling the operation of the liquid cooling device.

8. The dc charging system for the international and european dual-gun charging according to claim 7, wherein the relationship among the SOC value, the temperature, and the charging and discharging current of the power type power battery is preset in the BMS;

and the BMS determines the current maximum charging current of the power type power battery according to the relationship among the BMS, the current temperature of the power type power battery and the current SOC value of the power type power battery, and selects the smaller maximum charging current between the maximum charging current of the power type power battery and the maximum charging current of the charging pile as the actual charging current of the power type power battery.

9. The dc charging system according to claim 8, wherein the low-voltage communication signals of the first and second european standard charging sockets are first transmitted to the EVCC, and then converted into the national standard CAN signal by the EVCC and transmitted to the BMS; low-voltage communication signals of the first national standard charging socket and the second national standard charging socket are directly sent to the BMS;

when the BMS detects that the connection of the current charging socket is identified as national standard charging connection, charging according to a national standard charging flow;

when the BMS detects that the connection of the current charging socket is identified as the European standard charging connection, the EVCC converts the PLC signal of the European standard charging pile into a national standard CAN signal and sends the signal to the BMS, and then the charging is carried out according to the national standard charging process.

10. The dc charging system according to any one of claims 1 to 9, wherein the first and second european standard charging sockets employ a dc positive/negative high voltage interface, a PP charging gun, a PE grounding scheme, and a CP PWM frequency-based signal line;

the first national standard charging socket and the second national standard charging socket adopt direct current positive and negative high voltage interfaces, CC1 and CC2 charging guns, a PE grounding mode and a CAN signal line.

Technical Field

The invention relates to the technical field of new energy automobiles, in particular to a direct-current charging system supporting national standard and European standard double-gun charging.

Background

At present, the preservation of limited petroleum resources on the earth, the protection of the natural environment in which human beings rely on survival, the reduction of greenhouse gas emissions, and the suppression of global warming have become common problems facing all countries. The new energy automobile represented by the electric automobile has the characteristics of zero (low) pollutant emission, low noise, high energy efficiency, low maintenance and operation cost and the like, represents the development direction of the automobiles in the world, and needs to be charged by a charger to a vehicle-mounted power supply.

The problem of long charging time caused by small charging current still exists in the technical field of new energy automobile charging, and the problem is also a key point for restricting the further rapid development of the electric automobile industry at present. The use of a high-power charging technology for electric vehicles is a necessary trend for future development of the charging industry, meanwhile, the new energy industry in China actively develops the market of foreign new energy commercial vehicles, and the designed new energy commercial vehicles need to meet both international standard charging requirements and domestic standard charging requirements, so that a new charging system needs to be designed for the new energy commercial vehicles to solve the problem of compatibility between national standard charging and European standard charging.

Disclosure of Invention

The invention provides a direct current charging system for national standard and European standard double-gun charging, which is suitable for both national standard double-gun charging and European standard double-gun charging.

The invention provides a direct current charging system supporting national standard and European standard double-gun charging, which comprises a power battery, a battery management device, a national standard charging loop and an European standard charging loop, wherein the power battery is connected with the battery management device through a power line;

the power battery is connected with the battery management device and is also connected to a main loop of the system;

the national standard charging circuit comprises a first national standard charging circuit and a second national standard charging circuit, and a first national standard charging socket and a second national standard charging socket are respectively and correspondingly arranged on the first national standard charging circuit and the second national standard charging circuit;

the European standard charging loop comprises a first European standard charging loop and a second European standard charging loop, and a first European standard charging socket and a second European standard charging socket are correspondingly arranged on the first European standard charging loop and the second European standard charging loop respectively;

the first national standard charging loop, the second national standard charging loop, the first European standard charging loop and the second European standard charging loop are all connected with the battery management device and are connected to the main loop in parallel.

Furthermore, the first national standard charging circuit, the second national standard charging circuit, the first European standard charging circuit and the second European standard charging circuit are connected with the battery management device through a high-voltage plug-in and a low-voltage plug-in.

Furthermore, a positive relay and a negative relay are respectively arranged on the first national standard charging loop, the second national standard charging loop, the first European standard charging loop and the second European standard charging loop.

Furthermore, the main loop is provided with an MSD and a current sensor.

Furthermore, the power battery is a single-path power type power battery or a double-path power type power battery, and the double-path power battery is connected to a main loop of the system in a parallel connection mode.

Further, the battery management device is connected with a liquid cooling loop, the liquid cooling loop comprises a liquid cooling device, a liquid cooling high-voltage positive relay and a main negative relay, and the liquid cooling high-voltage positive relay, the liquid cooling device and the main negative relay are sequentially connected in series; the high-voltage interface of the liquid cooling device is connected with the battery management device and the main loop;

the BMS in the battery management device controls the opening and closing of the liquid cooling high-voltage positive relay, and the liquid cooling device controls the opening and closing of the main negative relay.

Further, the BMS supplies power to the liquid cooling device, and controls the power type power battery to be in a proper temperature range by controlling the operation of the liquid cooling device.

Further, the relation among the SOC value, the temperature and the charging and discharging current of the power type power battery is preset in the BMS;

and the BMS determines the current maximum charging current of the power type power battery according to the relationship among the BMS, the current temperature of the power type power battery and the current SOC value of the power type power battery, and selects the smaller maximum charging current between the maximum charging current of the power type power battery and the maximum charging current of the charging pile as the actual charging current of the power type power battery.

Further, low-voltage communication signals of the first European standard charging socket and the second European standard charging socket are firstly sent to the EVCC, then are converted into national standard CAN signals by the EVCC, and then are sent to the BMS; low-voltage communication signals of the first national standard charging socket and the second national standard charging socket are directly sent to the BMS;

when the BMS detects that the connection of the current charging socket is identified as national standard charging connection, charging according to a national standard charging flow;

when the BMS detects that the connection of the current charging socket is identified as the European standard charging connection, the EVCC converts the PLC signal of the European standard charging pile into a national standard CAN signal and sends the signal to the BMS, and then the charging is carried out according to the national standard charging process.

Furthermore, the first European standard charging socket and the second European standard charging socket adopt direct-current positive and negative high-voltage interfaces, a PP charging gun, a PE grounding mode and a CP signal line based on PWM frequency;

the first national standard charging socket and the second national standard charging socket adopt direct current positive and negative high voltage interfaces, CC1 and CC2 charging guns, a PE grounding mode and a CAN signal line.

The embodiment of the invention has the following beneficial effects:

the invention provides a direct current charging system supporting national standard and European standard double-gun charging, which can simultaneously meet the charging standard of national standard double-charging and the charging standard of European standard charging by arranging a first national standard charging loop, a second national standard charging loop, a first European standard charging loop and a second European standard charging loop and configuring a corresponding power battery and a battery management device, thereby realizing the simultaneous application of national standard double-gun charging and European standard double-gun charging, expanding the application range of new energy automobiles and greatly improving the convenience degree of the new energy automobiles during charging.

Drawings

Fig. 1 is an architecture diagram of a dc charging system for dual-gun charging in the international and european standards according to an embodiment of the present invention;

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a direct current charging system for national standard and European standard double-gun charging, which comprises a power battery, a battery management device, a national standard charging loop and an European standard charging loop, wherein the power battery is connected with the battery management device through a power line;

the power battery is connected to the main loops of the national standard charging loop and the European standard charging loop through a battery management device;

preferably, the battery management device is a battery high-voltage box;

preferably, the main loop is provided with MSD and a current sensor.

As one embodiment, the power battery is a single-path power type power battery or a double-path power type power battery, and the double-path power battery is connected to the main loops of the national standard charging loop and the european standard charging loop through the battery management device in a parallel connection manner.

The national standard charging circuit comprises a first national standard charging circuit and a second national standard charging circuit, and a first national standard charging socket and a second national standard charging socket are respectively and correspondingly arranged on the first national standard charging circuit and the second national standard charging circuit;

the European standard charging loop comprises a first European standard charging loop and a second European standard charging loop, and a first European standard charging socket and a second European standard charging socket are correspondingly arranged on the first European standard charging loop and the second European standard charging loop respectively;

the first national standard charging loop, the second national standard charging loop, the first European standard charging loop and the second European standard charging loop are connected in parallel;

as an embodiment, the first national standard charging loop, the second national standard charging loop, the first european standard charging loop and the second european standard charging loop are connected to the battery management device through a high-voltage plug-in and a low-voltage plug-in;

the first national standard charging circuit, the second national standard charging circuit, the first European standard charging circuit and the second European standard charging circuit adopt the same high-voltage wire plug-in unit, and can be directly butted with the battery high-voltage box through the same high-voltage wire plug-in unit. The low-voltage communication signals of the first European standard charging socket and the second European standard charging socket are connected to the EVCC, the EVCC is converted into a national standard direct current charging signal and then is connected to the BMS, the low-voltage signal of the national standard direct current charging socket is directly connected to the BMS, and the plug-in units of the first European standard charging socket and the second European standard charging socket are the same.

As one embodiment, a fast plug-in mode is adopted, a first national standard charging socket, a second national standard charging socket, a first European standard charging socket and a second European standard charging socket are configured according to vehicle type configuration and cost requirements, or only the European standard charging socket is configured, the national standard charging socket is selected, and when the national standard charging pile is used for charging, the high-low voltage fast plug-in provided by the national standard charging socket can be directly connected to the battery high-voltage box, so that the battery high-voltage box is simple and convenient.

As an embodiment, a positive relay and a negative relay are arranged on the first national standard charging circuit, the second national standard charging circuit, the first european standard charging circuit and the second european standard charging circuit.

As one embodiment, the battery management device is connected with a liquid cooling loop, the liquid cooling loop comprises a liquid cooling device, a liquid cooling high-voltage positive relay and a main negative relay, and a high-voltage interface of the liquid cooling device is connected to the main loop through the battery management device;

the BMS in the battery management device controls the on-off of the liquid cooling loop by controlling the liquid cooling high-voltage positive relay, and the liquid cooling device controls the on-off of the liquid cooling loop by controlling the main negative relay;

the BMS supplies power to the liquid cooling device, and the power type power battery is ensured to be in a proper temperature range by controlling the liquid cooling device.

As one example, the relation among the SOC value, the temperature and the charge and discharge current of the power type power battery is preset in the BMS;

and the BMS determines the current maximum charging current of the power type power battery according to the current temperature and SOC value of the power type power battery, and then selects the smaller maximum charging current between the maximum charging current of the power type power battery and the maximum charging current of the charging pile as the actual charging current of the power type power battery.

As an embodiment, the low-voltage communication signals of the first and second european standard charging sockets are connected to the EVCC, and then converted into national standard direct current charging signals by the EVCC to be connected to the BMS; the low-voltage communication signals of the first and second national standard charging sockets are directly connected to the BMS;

when the BMS detects that the connection identification of the current charging socket is national standard, charging according to a national standard charging flow;

when the BMS detects that the connection identification of the current charging socket is European standard, the EVCC converts the PLC signal of the European standard charging pile into a national standard CAN signal and sends the signal to the BMS, and then the charging is carried out according to the national standard charging process.

As an embodiment, the first european standard charging socket and the second european standard charging socket adopt an european standard combo2 alternating current and direct current integration mode, that is, a direct current positive and negative high voltage interface, a PP gun insertion connection mode, a PE grounding mode and a signal line of CP based on PWM frequency are adopted;

the first national standard charging socket and the second national standard charging socket adopt direct-current positive and negative high-voltage interfaces, a CC1/CC2 gun insertion connection mode, a PE grounding mode and CAN signal lines, and the CAN signal lines comprise CAN high-order signal lines and CAN low-order signal lines.

As an embodiment, the first national standard charging circuit, the second national standard charging circuit, the first european standard charging circuit and the second european standard charging circuit are all connected to the battery management device through a high-voltage plug-in and a low-voltage plug-in.

More detailed examples are as follows:

as shown in fig. 1, the charging system comprises a power battery, a battery management device, a first national standard charging loop, a second national standard charging loop, a first european standard charging loop and a second european standard charging loop;

preferably, the battery management device is a battery high-voltage box;

the power battery is a two-way power type power battery, the two-way power type battery is connected with the battery high-voltage box and is also connected to a main loop of the system, and the main loop is provided with an MSD (multi-level digital sensor) and a current sensor; setting the MSD (fuse) on the main loop to provide overcurrent fuse protection for the main loop, wherein the current sensor is used for detecting current information on the main loop; the power battery can also be a single-path power type power battery, and the charging multiplying power of the single-path power type power battery is more than or equal to 1C; and the charging multiplying power of the double-path power type power battery is more than or equal to 2C. The embodiment of the invention is provided with a large-capacity battery or a high-power battery, and is provided with hardware and software which are adaptive to the large-capacity battery or the high-power battery, namely the hardware and the software which meet the requirement of large current.

The battery high-voltage box is connected with a liquid cooling loop, the liquid cooling loop comprises a liquid cooling system, a liquid cooling high-voltage positive relay and a main negative relay, and the liquid cooling high-voltage positive relay, the liquid cooling system and the main negative relay are sequentially connected in series; the high-voltage interface of the liquid cooling system is connected with the battery management device and is also connected to the main loop;

BMS control in the battery high-voltage box the switching of the positive relay of liquid cooling high pressure is in order to control the break-make in liquid cooling return circuit, the liquid cooling system control the switching of main negative relay is in order to control the break-make in liquid cooling return circuit prevents to lead to because of the unable disconnection of single relay the power battery charges and discharges unusually and the problem of high temperature.

The BMS supplies power to the liquid cooling system and controls the power type power battery to be in a proper temperature range by controlling the operation of the power supply of the liquid cooling system; the BMS controls the liquid cooling system to enter a high-pressure mode, a heating mode, a cooling mode or a self-circulation mode to ensure that the power battery is in a proper working temperature range; the BMS provides power for the liquid cooling system, namely, the BMS outputs power to the liquid cooling system after awakening and awakens the liquid cooling system, and the BMS stops outputting power to the liquid cooling system before sleeping.

And the BMS requests a charging current from a charging pile according to the charging capacity of the power battery, and the charging pile controls the output of the current.

The relation among the SOC value, the temperature and the charging and discharging current of the power type power battery is preset in the BMS;

and the BMS determines the current maximum charging current of the power type power battery according to the current temperature of the power type power battery, the current SOC value and the relationship among the three, and selects the smaller maximum charging current between the maximum charging current of the power type power battery and the maximum charging current of the charging pile as the actual charging current of the power type power battery. And the charging current request of the BMS is sent to a national standard charging pile through a national standard CAN signal or the EVCC converts the national standard CAN signal into a PLC signal and then sends the PLC signal to an European standard charging pile. The BMS sends a high-power charging request to the charging pile, and the charging current can reach 400A.

The European standard charging adopts gateway conversion, the European standard charging pile communicates with a gateway (EVCC) through PLC communication, and the gateway converts the communication content into a CAN signal national standard protocol and then sends the CAN signal national standard protocol to a BMS (battery management system) so as to realize the European standard charging communication; if adopt the European standard to fill electric pile, the rifle socket that charges is the European standard socket that charges, and the communication is through EVCC conversion to BMS. If the national standard charging pile is used for charging, the communication conversion module is not needed, and the national standard charging socket is directly charged with the plug gun, so that the charging compatible with national standard and European standard in free configuration is realized.

The first national standard charging loop, the second national standard charging loop, the first European standard charging loop and the second European standard charging loop are all connected with the battery high-voltage box and are connected to the main loop in parallel; a first national standard charging socket and a second national standard charging socket are respectively and correspondingly arranged on the first national standard charging loop and the second national standard charging loop, and a first European standard charging socket and a second European standard charging socket are respectively and correspondingly arranged on the first European standard charging loop and the second European standard charging loop;

first national standard charge circuit, second national standard charge circuit, first european standard charge circuit and second european standard charge circuit are equallyd divide on and do not are provided with direct current positive relay and the negative relay that charges to prevent that single relay adhesion return circuit can't break off, thereby lead to the problem of battery overcharge.

The low-voltage communication signals of the first European standard charging socket and the second European standard charging socket are firstly sent to the EVCC, then are converted into national standard CAN signals by the EVCC and then are sent to the BMS; low-voltage communication signals of the first national standard charging socket and the second national standard charging socket are directly sent to the BMS;

when the BMS detects that the connection of the current charging socket is identified as national standard charging connection, charging according to a national standard charging flow;

when the BMS detects that the connection of the current charging socket is identified as the European standard charging connection, the EVCC converts the PLC signal of the European standard charging pile into a national standard CAN signal and sends the signal to the BMS, and then the charging is carried out according to the national standard charging process.

The first European standard charging socket and the second European standard charging socket adopt an European standard combo2 alternating current and direct current integration mode, and the European standard combo2 alternating current and direct current integration mode comprises a direct current positive and negative high voltage interface, a PP charging gun, a PE grounding mode and a CP signal line based on PWM frequency;

the first national standard charging socket and the second national standard charging socket adopt direct-current positive and negative high-voltage interfaces, CC1 and CC2 charging guns, a PE grounding mode and CAN signal lines, and the CAN signal lines comprise CAN high-level signal lines and CAN low-level signal lines.

The high-power double-gun direct-current charging is based on a high-capacity or power type battery, double charging guns are supported to be connected for charging by arranging two charging loops, direct-current charging current is increased to shorten charging time, and national standard charging and European standard charging are supported according to a charging pile protocol standard.

At present, the national standard stipulates that the universal maximum voltage platform is 750V, the maximum charging current of a single charging gun is 250A, the maximum charging power of the single charging gun is 187kw, the charging requirements of passenger vehicles and small-electric-quantity battery vehicle types are met, but for commercial vehicles and large buses, the configuration electric quantity is large, the configuration electric quantity of a light card is 80-100 kw, the configuration electric quantity of a medium-heavy card is 200-300 kw, the charging is carried out according to the requirements, the charging speed is large in a range of 0.5 h/1-2 h of the medium-heavy card, and the lifting space of the charging speed is large. The high-power quick charging is the trend of industry development, breaks through the industry difficulty, shortens the charging time and meets the requirement of quick charging of customers. In order to meet the requirement of new energy products for sale abroad, the embodiment of the invention is provided with a European standard charging function on the basis of the national standard charging function. The embodiment of the invention has the following advantages:

(1) the charging current is greatly increased, the maximum charging current reaches 400A, and the maximum charging power reaches 300 kw;

(2) effectively shorten the charging time, the charging time of the medium and heavy truck can be shortened to 0.5-1 h, and the charging time is effectively shortened.

(3) Satisfy the European standard function of charging, adapt to overseas market demand, solve the customer and charge the mark and mismatch the problem.

(4) The single gun and the double gun are compatible for charging, the national standard and the European standard are compatible, and the charging convenience and the timeliness are effectively improved.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that all or part of the processes of the above embodiments may be implemented by hardware related to instructions of a computer program, and the computer program may be stored in a computer readable storage medium, and when executed, may include the processes of the above embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.