KR102524933B1 - Battery charging system for an electric special vehicle and method of charging an electric special vehicle - Google Patents

Abstract

In the present invention, a first battery pack that supplies power necessary for driving a vehicle, a bi-directional OBC that converts direct current and alternating current in both directions and synchronizes voltage and power frequency during charging and discharging of the first battery pack, and A first BMS that monitors states and automatically manages operations, a first control unit that is electrically connected to the first BMS and the EVCC of the vehicle to perform and control processes related to charging the first battery pack, and a charging socket of the vehicle and the two-way A first relay that controls the opening and closing of an electric circuit connecting OBCs, a second battery pack that supplies power required to drive the refrigeration and refrigeration equipment installed in the loading box of a vehicle, and direct current and A bidirectional converter that converts alternating current into two directions, a second BMS that monitors the state of the second battery pack and automatically manages its operation, and is electrically connected to the second BMS and EVCC to perform processes related to charging of the second battery pack, and A second control unit for controlling, a second relay for controlling opening and closing of an electric circuit connecting between the charging socket and the bidirectional converter, and opening and closing of an electric circuit connecting the bidirectional converter and the refrigerating and refrigerating equipment installed in the loading box of the vehicle. Disclosed is a battery charging system for an electric specially equipped vehicle including a third relay for controlling.

Description

Battery charging system and charging method of electric specially equipped vehicles

The present invention relates to a battery charging system and charging method for an electric refrigerating/refrigerating truck equipped with a refrigerating/refrigerating facility that consumes power separately from an electric motor for driving the vehicle, and more particularly, to a charging socket Electric can selectively charge two battery packs that supply different power sources to increase charging convenience, and maximize charging efficiency and performance by charging one of the two battery packs first according to the loading and driving conditions of the vehicle. It relates to a battery charging system and charging method of a specially equipped vehicle.

Today, electric vehicles (EVs) generate driving force by supplying electric energy from high-voltage batteries to electric motors, thereby reducing fine dust and greenhouse gases in the transportation sector, alleviating air pollution problems and contributing to the improvement of energy use efficiency. Various support policies are being promoted for the distribution and expansion of electric vehicles.

In particular, if diesel trucks, which account for the majority of small trucks in Korea, are converted to electric trucks, it can greatly contribute to air pollution improvement and greenhouse gas reduction by reducing carbon dioxide emissions.

Electric trucks recently developed by major commercial vehicle manufacturers in Korea are equipped with high-capacity lithium polymer batteries and can travel 250 to 300 km on a single charge.

In addition, to charge the battery of the electric truck, the charger connector of the electric vehicle service equipment (EVSE) is connected to the vehicle-side charging socket (inlet) for rapid charging of DC power or slow charging of AC power. can do.

However, in the case of electric special vehicles such as refrigeration and refrigeration trucks that use electricity in addition to container-type cargo boxes of electric trucks, it is difficult to cover power consumption with a single battery pack, so that constant temperature and freshness are maintained as much as possible. There are limitations that are not suitable for transportation of fresh food, etc.

In order to supplement and solve this problem, Patent Document 1 discloses a 'power supply system for refrigerators for specially equipped vehicles' additionally equipped with battery packs for refrigeration and refrigeration facilities independently of battery packs that supply power for driving of special vehicles.

However, since this is a structure in which each battery pack is limitedly used according to a predetermined purpose, energy efficiency and performance are significantly reduced, and charging is very cumbersome and inconvenient because each battery pack must be individually charged.

In addition, if the battery pack for refrigerating and refrigerating equipment is discharged or drops to low voltage while the vehicle is in operation, it is impossible to use the refrigerating and refrigerating equipment and maintain a constant temperature, resulting in handling loss as the food in the loading box is easily deteriorated. In addition, there is a problem that adversely affects the lifespan of the battery pack.

On the other hand, when external mechanical, thermal, or electrical stresses such as high impact, overheating, sudden surge, overcurrent, or overvoltage are continuously accumulated, the internal pressure of the battery cell rises and exceeds a certain pressure, the battery cell appearance deteriorates. After venting, the electrolyte components inside the battery cell are vaporized and off-gas is released.

If the external stress continues even after the off-gas is generated, after about 10 minutes, the temperature inside the battery cell is transferred to a thermal runaway state in which the temperature inside the battery cell rapidly rises, and the dielectric strength inside the battery cell is lowered, causing ignition. As the fire spreads to cells, battery modules and combustible materials, huge economic losses occur.

Therefore, there is a need to develop a technology for preventing thermal runaway by detecting off-gas of a battery electrolyte component in advance before a fire occurs in an electric truck.

The background art or prior art described above herein is information possessed by the present inventor or acquired in the process of deriving the present invention, and is only intended to help understand the technical significance of the present invention, prior to the filing of the present invention, the technology to which this invention belongs It should be noted that it does not mean widely known technologies in the field.

KR 10-2182838 B1(2020.11.19) KR 10-2020-0131053 A(2020.11.23) KR 10-2016-0144795 A(2016.12.19) KR 10-2015-0077820 A(2015.07.08) KR 10-1388388 B1(2014.04.16) KR 10-2205841 B1(2021.01.15)

Therefore, the present inventor comprehensively considers the above-mentioned matters and at the same time, in order to solve the technical limitations and problems of the battery charging system technology of the existing electric special vehicle, install two battery packs in the vehicle, and one is a load for driving the vehicle. While supplying power to loads such as refrigerating and refrigerating equipment installed in the loading box of the vehicle, the charging efficiency and performance are improved by appropriately controlling the charging of each battery pack according to the loading and driving conditions of the vehicle. In addition, it is possible to selectively charge two battery packs that supply different power sources with one charging socket (inlet) to increase charging convenience. As a result of continuous research to develop a battery charging system and charging method for electric special vehicles with a new structure that can be emergency charged using the energy of a battery pack in a high voltage state in the case of a low voltage or discharge state. invented the invention.

Therefore, the technical problem and object to be solved by the present invention is to provide a battery charging system and charging method for electric special vehicles that can maximize the charging efficiency and performance of a battery pack.

Another technical problem and object to be solved by the present invention is to provide a battery charging system and charging method for an electric specially equipped vehicle that enables emergency charging between battery packs without connection to an external power source.

Here, the technical problems and objects to be solved by the present invention are not limited to the technical problems and objects mentioned above, and other technical problems and objects that are not mentioned are the general knowledge in the technical field to which the present invention belongs from the description below. Those who have it will be able to clearly understand.

Specific means according to an aspect of the present invention for effectively achieving a specific technical purpose while embodying a new idea for solving the technical problem of the present invention as described above are a charging socket, power required for driving a vehicle A first battery pack that supplies a first battery pack, a bi-directional OBC that converts direct current and alternating current in both directions and synchronizes voltage and power frequency during charging and discharging of the first battery pack, and monitors the state of the first battery pack and automatically manages its operation. The first BMS is electrically connected to the first BMS and the EVCC of the vehicle to perform a process related to charging the first battery pack, sets a charging or discharging mode of the bi-directional OBC, and sets the first battery according to the set mode. A first control unit that controls the charging and discharging of the pack, a first relay that controls the opening and closing of the electric circuit connecting the charging socket and the bidirectional OBC, and the power required to drive the refrigerating and refrigerating equipment installed in the loading box of the vehicle. A second battery pack that supplies, a bi-directional converter that converts DC and AC in both directions during charging and discharging of the second battery pack, a second BMS that monitors the state of the second battery pack and automatically manages its operation, and the second BMS and EVCC. The second battery pack is electrically connected to perform a process related to charging the second battery pack, sets a charging or discharging mode of the bi-directional converter, and controls charging and discharging of the second battery pack according to the set mode. A controller, a second relay for controlling opening and closing of an electric circuit connecting the charging socket and the bidirectional converter, and a second relay for controlling opening and closing of an electric circuit connecting the bidirectional converter and a refrigerating/refrigerating facility installed in a loading box of a vehicle. A battery charging system for an electric specially equipped vehicle, characterized in that it is employed including 3 relays, is presented.

Accordingly, the present invention has a new effect of maximizing charging efficiency and performance by appropriately controlling the charging of each battery pack according to the loading and driving conditions of the vehicle.

In addition, in a preferred embodiment of the present invention, the first control unit and the second control unit more efficiently control charging of the first and second battery packs by interworking and synchronizing with each other in real time by an electric signal, It can stably supply the power required for driving or the power required for driving loads such as refrigeration and refrigeration facilities.

And a specific means according to another embodiment of the present invention, (A) the first control unit determines whether the charger connector of the electric vehicle charging facility (Electric Vehicle Service Equipment; EVSE) is connected to the charging socket of the vehicle. Checking step, (B) the first control unit confirms the ignition off state of the vehicle, and the second controller checks the operation off state of the refrigerating and refrigerating equipment installed in the loading box of the vehicle, (C) the first Determining, by the controller, whether there is a request for charging the second battery pack from the second controller; (D) when there is no request for charging the second battery pack from the second controller, communication compatibility between the first controller and the EVCC; checking whether or not it is normal, turning on the first relay and operating the bi-directional OBC to charge the first battery pack; (E) the first controller through the first BMS to charge the first battery; Checking the state of charge (SOC) of the pack and completing charging when it reaches a predetermined range; (F) when there is a request to charge the second battery pack from the second controller, Checking whether the communication between the control unit and the EVCC is compatible, and if normal, turning on the second relay and turning off the third relay, and operating the bidirectional converter to charge the second battery pack, ( G) A method for charging a battery of an electric specially equipped vehicle comprising the steps of the second control unit checking the state of charge (SOC) of the second battery pack through the second BMS, and completing charging when it reaches a predetermined range. presents

Accordingly, the present invention can maximize charging efficiency and performance by appropriately controlling the charging of each battery pack according to the loading and driving conditions of the vehicle.

Further, in a preferred embodiment of the present invention, after the step (E), the second control unit checks the remaining battery capacity of the second battery pack, and if it is less than a predetermined range, the step (F) is performed immediately after the step. After the step (G), the first control unit checks the remaining battery capacity of the first battery pack, and if it is less than a predetermined range, the first and second battery packs are charged by immediately performing the step (D). can be more efficiently controlled to stably supply the power required to drive the vehicle or the power required to drive loads such as refrigeration and refrigeration facilities.

According to the technical idea and embodiment of the present invention, on which a unique solution is based to solve the above technical problem, by independently installing two battery packs in a vehicle, one is used for a vehicle driving load or electrical component. Power is supplied, and the other one can supply power to the refrigerating and refrigerating facilities installed in the loading box of the vehicle.

In addition, each battery pack can be selectively charged through a single charging socket, which enhances charging convenience, as well as appropriately controls according to the vehicle's loading and driving conditions, so that one battery pack can be charged first, which improves charging efficiency and battery life. performance can be maximized.

In addition, by actively checking the state of each battery pack, if any one of the battery packs is in a low voltage or discharged state, emergency charging can be performed using the energy of the high voltage or normal state battery pack without connection to an external power source. It can stably supply the power required to drive the load or the power required to drive the load, such as refrigeration and refrigeration equipment.

Here, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a block diagram schematically showing the configuration of a battery charging system for a specially equipped electric vehicle according to an embodiment of the present invention.
2 is a side view schematically illustrating the configuration of a battery charging system for a specially equipped electric vehicle according to an embodiment of the present invention.
3 is a flowchart schematically illustrating a battery charging method of an electric specially equipped vehicle according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

Prior to this, the terms to be described below are defined in consideration of functions in the present invention, which specifies that they should be interpreted as concepts consistent with the technical spirit of the present invention and meanings commonly used or commonly recognized in the art.

In addition, if it is determined that a detailed description of a known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description will be omitted.

The accompanying drawings are partially exaggerated or simplified for explanation of the configuration and operation of the technology and convenience and clarity of understanding, and it is revealed that each component does not exactly match the actual size and shape.

In addition, in this specification, the term and / or is meant to include a combination of a plurality of related items described or any item among a plurality of related items described, and when a part includes a certain component, this is particularly the opposite description. As long as there is no , it means that other components can be included more than not excluding other components.

That is, terms such as 'include', 'include', or 'have' mean that the features, number, steps, operations, components, parts, or combinations thereof described in this specification exist. However, it should be understood that it does not exclude the possibility of the presence or addition of one or more other features or numbers, step-operating elements, parts, or combinations thereof.

In addition, each step may occur in a different order from the specified order unless a specific order is clearly described in context. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

In addition, the meaning of the terms 'unit', 'module' and 'unit' means a unit or form that plays a role in processing at least one function or a certain operation for the purpose of the system, which is hardware or software or hardware and It can be implemented as a means through software combination, etc., or as a device or assembly capable of performing an independent operation.

In addition, terms such as top, bottom, top, bottom, or top, bottom, top, bottom, front and rear, left and right are used for convenience to distinguish the relative positions of each component. For example, an upper part in the drawing may be named or referred to as an upper part, a lower part may be named or referred to as a lower part, a longitudinal direction may be named or referred to as a front-back direction, and a width direction may be named or referred to as a left-right direction.

Also, terms such as first and second may be used to describe various elements. That is, terms such as first and second may be used for the purpose of distinguishing only one element from another element. For example, a first component may be referred to as a second component without departing from the scope of the present invention, and the second component may also be referred to as a first component.

Referring to FIG. 1, the main components constituting the battery charging system of an electric special vehicle according to an embodiment of the present invention are a charging socket 10, a first battery pack 11, a bi-directional OBC 12, and a first BMS 13 ), a first control unit 14, a first relay 15, a second battery pack 16, a bi-directional converter 17, a second BMS 18, a second control unit 19, a second relay 20, and A third relay 21 is included.

The charging socket 10 is mounted on a vehicle in order to slowly charge AC power by connecting a charger connector of an Electric Vehicle Service Equipment (EVSE).

For example, the charging socket 10 receives AC power of 220V from an electric vehicle charging facility and converts it into DC power through a bi-directional OBC 12 or a bi-directional converter 17 so that the first battery pack 11 or the second The battery pack 16 can be charged.

Here, the charging socket 10 may be made of an AC single-phase (5PIN) type for slow charging.

The first battery pack 11 supplies power to loads or electrical components necessary for driving and driving a vehicle.

Here, the first battery pack 11 is composed of a secondary battery that has an output voltage of, for example, DC 350V and can be easily charged and discharged, and can be mounted on a vehicle body (underframe) or the like.

In addition, the first battery pack 11 may include a power module that receives a control signal from the first BMS 13 and measures power on/off operation and current.

A bi-directional on board charger (OBC) 12 bidirectionally converts direct current and alternating current during charging and discharging of the first battery pack 11 and synchronizes voltage and power frequency.

To this end, the bidirectional OBC 12 includes an AC↔DC converter and bidirectional power such as a step-up/step-down converter that converts high-voltage DC power from the first battery pack 11 into low-voltage DC power suitable for vehicle driving and electronic devices. A control circuit is applied.

For example, the bi-directional OBC 12 is located between the charging socket 10 and the first battery pack 11 mounted on the vehicle and converts AC power supplied from an electric vehicle charging facility (EVSE) into DC power to provide power. In addition to supplying power to one battery pack 11, DC power of the first battery pack 11 may be converted into AC power and supplied as GRID (line power supply) or LOAD.

The first BMS (Battery Management System) 13 monitors the charging state of the first battery pack 11, such as voltage, current, temperature, etc., and automatically manages the operation to maintain it in an optimal state.

The first control unit 14 checks whether the charger connector of the electric vehicle charging facility is connected to the charging socket 10, sets the charging or discharging mode of the bi-directional OBC 12, and sets the first battery pack according to the set mode. (11) to control the charging and discharging.

In addition, the first controller 14 electrically connects the first BMS 13 and the EVCC 25 to process a process related to charging the first battery pack 11. It is connected.

In addition, the first controller 14 includes a communication interface for stabilizing data communication timing and charging sequence.

That is, when a charger connector of an electric vehicle service equipment (EVSE) is connected to the charging socket 10 to charge the first battery pack 11, the communication interface mounted on the first BMS 13 and the second 1 The charging process is performed while exchanging defined message formats between communication interfaces mounted in the control unit 14.

For example, when the communication interface mounted on the first BMS 13 is defined as the main interface and the communication interface of the first control unit 14 that controls power supplied from the outside is defined as a sub-interface, the charging process is performed on the main interface. transmits a wake-up signal to the sub-interface, and after the wake-up, turns on the first control unit 14 to start CAN (Controller Network Area) communication, and after completing charging preparation, the sub-interface to the main interface When the charging preparation completion message is transmitted to , the first BMS 13 starts charging by transmitting a charging command.

In addition, when the charging termination condition is satisfied, the first control unit 14 transmits a wake-up off signal from the first BMS 13 and terminates CAN communication after the charging is terminated.

Here, the EVCC 25 controls the charging state such as voltage and current through pilot communication according to charging infrastructure and charging standards such as IEC61851-1 or SAE J1772 when charging the first and second battery packs 11 and 16 It can provide charge information and perform security authentication functions.

The first relay 15 controls opening and closing of an electric circuit connecting the charging socket 10 and the bidirectional OBC 12 according to a control signal from the first control unit 14 .

Here, the first relay 15 may adopt a structure operated by current supplied from the bi-directional OBC 12 .

The second battery pack 16 supplies power to loads necessary for driving and operating the refrigerating/refrigerating facility 30 installed in the loading box C of the vehicle.

Here, the second battery pack 16 is composed of a secondary battery that has an output voltage of, for example, DC 250V and can be easily charged and discharged, and can be mounted in the loading box C of the vehicle.

In addition, the second battery pack 16 may include a power module that receives a control signal from the second BMS 18 and measures power on/off operation and current.

Meanwhile, the refrigerating/refrigerating facility 30 installed in the loading box C of the vehicle can be driven by AC power of 220V supplied from the second battery pack 16 through the bi-directional converter 17.

Here, the refrigeration/refrigeration facility 30 is a mechanical device that cools or freezes a target object by obtaining a low temperature using a refrigerant, and includes a condenser, an evaporator, a cooler, and a compressor to form a refrigeration cycle using the refrigerant. (compressor), expansion valve (expanssive valve), and the like.

The bidirectional converter 17 bidirectionally converts DC and AC during charging and discharging of the second battery pack 16 .

To this end, the bi-directional converter 17 converts high-voltage DC power from the second battery pack 16, including the AC↔DC converter, into low-voltage DC power suitable for refrigeration and refrigeration equipment installed in the loading box of the vehicle. A bi-directional power control circuit such as a converter is applied.

The second BMS 18 maintains the voltage, current, and temperature of the second battery pack 16 in an optimal state by monitoring and automatically managing the charging state.

The second control unit 19 checks whether the charger connector of the electric vehicle charging facility is connected to the charging socket 10, sets the charging or discharging mode of the bi-directional converter 17, and sets the second battery pack according to the set mode. (16) to control the charging and discharging.

In addition, the second control unit 19 is electrically connected to the second BMS 18 and the EVCC 25 of the vehicle in order to process a process related to charging the second battery pack 16 .

In addition, the second controller 19 includes a communication interface for stabilizing data communication timing and charging sequence.

That is, when the charger connector of the electric vehicle charging facility (EVSE) is connected to the charging socket 10 to charge the second battery pack 16, the communication interface mounted on the second BMS 18 and the second control unit 19 The charging process is performed by exchanging defined message formats between the communication interfaces mounted on the .

For example, when the communication interface mounted on the second BMS 18 is defined as the main interface and the communication interface of the second control unit 19 that controls power supplied from the outside is defined as a sub-interface, the charging process is performed on the main interface. transmits a wake-up signal to the sub-interface, and after the wake-up, turns on the second control unit 19 to start CAN (Controller Network Area) communication, and after completion of charging preparation, the sub-interface to the main interface When the charge ready message is transmitted to , the second BMS 18 starts charging by transmitting a charge command.

In addition, when the charging termination condition is satisfied, the second controller 19 transmits a wake-up off signal from the second BMS 18 and terminates CAN communication after the charging is terminated.

Here, the first control unit 14 and the second control unit 19 may process data by interworking and synchronizing with each other in real time by electrical signals, and the bi-directional OBC 12, the first and second BMS 18, and the EVCC ( 25) and CAN (Controller Network Area) communication.

In addition, the first control unit 14 and the second control unit 19 receive various control commands or data including a user's operation signal through a separate control device or user interface device such as a remote control or a touch screen. can

In addition, the first control unit 14 and the second control unit 19 may obtain information or signals about the charging system from each component.

On the other hand, the first control unit 14 and the second control unit 19 may include a processor that performs a processing function and a memory that stores data, which include Application Apecific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), At least among digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, and micro-processors It can be implemented using either one.

The second relay 20 controls opening and closing of an electric circuit connecting the charging socket 10 and the bidirectional converter 17 according to a control signal from the second control unit 19 .

The third relay 21 controls the opening and closing of an electric circuit connecting the bi-directional converter 17 and the refrigerating/refrigerating facility 30 installed in the loading box of the vehicle according to the control signal of the second control unit 19.

Here, the second and third relays 20 and 21 may employ a structure in which they are operated by the current supplied from the bi-directional converter 17 .

Meanwhile, referring to FIG. 2 , the second battery pack 16, the bi-directional converter 17, the second BMS 18, the second control unit 19, the second relay 20, and the third relay 21 are a vehicle It may be built into the battery mounting window 40 provided separately on the inside or one side of the loading box (C).

In addition, the battery mounting window 40 is provided with a volatile organic compound gas sensor 41 that detects off gas of an electrolyte component leaking from the second battery pack 16 in advance and transmits it to the second control unit 19. An exhaust fan 42 that operates according to a control signal of the second control unit 19 by a transmission signal of the gas sensor 41 and exhausts and ventilates the gas inside the battery mounting window 40 is provided.
In addition, a thermo-hygrostat 43 is provided to keep the temperature and humidity of the air inside the battery mounting window 40 constant by circulating air inside and outside the battery mounting window 40 .

In addition, the battery mounting window 40 is provided with a pressure sensor 44 for measuring internal pressure and converting it into an electrical signal suitable for control.
In addition, when the pressure of air and gas inside the battery mounting window 40 rises above the set pressure, a pressure reducing valve 45 is provided to discharge it outside to lower the pressure and keep it constant.

Here, the exhaust fan 42 may adopt an automatic opening and closing ventilation fan that automatically opens its wings to prevent the inflow of external dust or insects when the power is turned off, or a shutter-integrated ventilation fan in which the opening and closing automatically closes when not in use, and a pressure reducing valve (45 ) may be made of a solenoid valve operated by the second control unit 19.

In addition, the installation position and number of pressure reducing valves 45 are not limited. That is, it is preferable to distributively arrange several pressure reducing valves 45 so that the internal pressure can be instantaneously reduced according to the size of the battery mounting window 40 .

In addition, the pressure reducing valve 45 is connected to the vacuum tank 46 to smoothly exhaust (suck out) off-gas of the electrolyte component leaking from the second battery pack 16 .

Further, the vacuum tank 46 is installed below the battery mounting window 40, and the inside of the vacuum tank 46 and the battery mounting window 40 are connected through a pressure reducing valve 45.

That is, when off-gas is discharged from the second battery pack 16 or the atmospheric pressure in the battery mounting window 40 rises above the set value, 1 The exhaust fan 42 operates sequentially to discharge gas, and when the pressure continuously rises and exceeds a certain pressure, the pressure sensor 44 detects this, and the second control unit 19 transmits from the pressure sensor 44 Based on the received signal, the pressure in the battery mounting window 40 can be momentarily reduced by opening the pressure reducing valve 45 to exhaust the gas due to the pressure difference between the pressure in the vacuum tank 46 and the battery mounting window 40 .

Therefore, the off-gas generated in the battery mounting window 40 is primarily discharged through the exhaust fan 42, and the temperature and humidity of the thermo-hygrostat 43 are controlled to prevent the temperature rise of the battery and exceed a certain pressure. When the pressure is reduced by the operation of the pressure reducing valve 45, it is possible to minimize fire and explosion accidents due to thermal runaway in which the temperature inside the battery cell rapidly rises.

Meanwhile, the battery mounting window 40 may include an LED or display device for displaying information of the second controller 19 to the outside.

For example, the amount of charge or the charge/discharge state of the second battery pack 16 is displayed through an LED or a display device, and information on the control performed by the second control unit 19 is displayed in the form of numbers, diagrams, or graphs. It is possible to indicate on the screen whether the exhaust fan 42, the thermo-hygrostat 43, and the pressure reducing valve 45 are operating.

A charging method using the battery charging system of an electric specially equipped vehicle according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

First, the first control unit 14 checks the off state of the vehicle, and the second control unit 19 checks the off state of the refrigerating and refrigerating equipment 30 installed in the loading box of the vehicle, and then the EVCC 25 It communicates with an electric vehicle charging facility (EVSE) through and checks whether the charger connector of the electric vehicle charging facility is connected to the charging socket 10 of the vehicle (S101).

Subsequently, the first controller 14 determines whether there is a request for charging the second battery pack 16 from the second controller 19 (S103).

As a result of the determination, when there is no request for charging the second battery pack 16 from the second controller 19, communication compatibility between the first controller 14 and the EVCC 25 is checked and verified (S105).

Then, if the communication between the first control unit 14 and the EVCC 25 is in a compatible state, that is, in a normal state, the first relay 15 is turned on (S107) and the bidirectional OBC 12 is operated. The first battery pack 11 is charged (S109).

At this time, the first control unit 14 checks whether the communication protocol with the EVCC 25 is compatible, and determines that data communication is normal if real-time data communication is possible, and abnormal if not.

Thereafter, the first controller 14 checks the state of charge (SOC) of the first battery pack 11 in real time through the first BMS 13 and completes charging when it reaches a predetermined range ( S111).

For example, when the remaining charge of the first battery pack 11 is 100%, the first controller 14 may turn off the first relay 15 to terminate charging.

If there is a request for charging the second battery pack 16 from the second control unit 19 in step S103, it is checked and confirmed whether communication is compatible between the second control unit 19 and the EVCC 25 (S115).

Subsequently, if the communication between the second control unit 19 and the EVCC 25 is in a compatible state, that is, in a normal state, the second relay 20 is turned on and the third relay 21 is turned off, (S117), the bi-directional converter 17 is operated to charge the second battery pack 16 (S119).

At this time, the second control unit 19 may check whether or not the communication protocol with the EVCC 25 is compatible, and judge that data communication is normal if real-time data communication is possible, and abnormal if not.

Thereafter, the second control unit 19 checks the state of charge (SOC) of the second battery pack 16 in real time through the second BMS 18 and completes charging when it reaches a predetermined range ( S121).

For example, when the remaining charge of the second battery pack 16 is 100%, the second controller 19 may turn off the second relay 20 to terminate charging.

Meanwhile, after performing step S111, the second control unit 19 performs step S113 of checking the remaining battery capacity of the second battery pack 16 through the second BMS 18 to charge the second battery pack 16. If the remaining amount is less than the predetermined range, step S115 may be immediately followed.

In addition, after performing step S121, the first control unit 14 performs step S123 of checking the remaining battery capacity of the first battery pack 11 through the first BMS 13 to determine the remaining charge of the first battery pack 11. If it is less than the predetermined range, step S105 may be immediately followed.

As described above, in the charging method using the battery charging system of an electric specially equipped vehicle according to an embodiment of the present invention, the first battery supplies power to a vehicle driving load or electronic components through one charging socket 10 according to the loading and driving conditions of the vehicle. The second battery pack 16, which supplies power to the pack 11 and the refrigerating/refrigerating equipment 30 installed in the loading box of the vehicle, can be appropriately selected and recharged as necessary, thereby improving charging efficiency and battery performance. can be maximized.

Meanwhile, devices and components constituting the charging system according to an embodiment of the present invention may be implemented as hardware components, software components, and/or a combination of hardware components and software components.

For example, a processor, controller, arithmetic logic unit (ALU), digital signal processor, microcomputer, field programmable array (FPA), programmable logic unit (PLU), microprocessor, or executing instructions. and can be implemented using one or more general purpose or special purpose computers, like any other device capable of responding.

Also, the processing device may execute an operating system (OS) and one or more software applications running on the operating system, and may access, store, manipulate, process, and generate data in response to execution of the software.

For example, a processing device may include a plurality of processors or a processor and a controller. Also, other processing configurations are possible, such as parallel processors.

Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired, or independently or collectively, a processing device. can be commanded.

In addition, the charging method according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. Computer readable media may include program instructions, data files, data structures, etc. alone or in combination.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - Includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media and ROM, RAM, flash memory, etc.

Examples of the program instructions include high-level language codes that can be executed by a computer using an interpreter or the like as well as machine language codes such as those produced by a compiler.

On the other hand, the present invention is not limited by the above-described embodiment (embodiment) and the accompanying drawings, and can be variously modified and applied in various ways not illustrated within the scope without departing from the technical spirit of the present invention, as well as each It is clear to those skilled in the art that the components can be widely applied by replacing components and changing to other equivalent embodiments.

Therefore, contents related to the modification and application of the technical features of the present invention should be interpreted as being included within the technical spirit and scope of the present invention.

10: charging socket 11: first battery pack
12: bi-directional OBC 13: first BMS
14: first control unit 15: first relay
16: second battery pack 17: bi-directional converter
18: 2nd BMS 19: 2nd control unit
20: second relay 21: third relay

Claims (4)

charging socket 10;
a first battery pack 11 supplying power for driving the vehicle;
a bi-directional OBC (12) for converting direct current and alternating current in both directions and synchronizing voltage and power frequency during charging and discharging of the first battery pack (11);
a first BMS (13) that monitors the state of the first battery pack (11) and automatically manages its operation;
It is electrically connected to the first BMS (13) and the EVCC (25) of the vehicle to process the process related to charging and discharging of the first battery pack (11), and to set the charging or discharging mode of the bi-directional OBC (12), , a first controller 14 that controls charging and discharging of the first battery pack 11 according to the set mode;
a first relay 15 controlling opening and closing of an electric circuit connecting the charging socket 10 and the bi-directional OBC 12;
A second battery pack 16 supplying power for driving the refrigerating and refrigerating equipment 30 installed in the loading box C of the vehicle;
a bi-directional converter 17 that converts direct current and alternating current in both directions during charging and discharging of the second battery pack 16;
a second BMS (18) that monitors the state of the second battery pack (16) and automatically manages its operation;
It interworks and synchronizes with the first control unit 14 in real time by an electrical signal, and is electrically connected to the second BMS 18 and the EVCC 25 of the vehicle to charge and discharge the second battery pack 16. a second controller 19 that processes related processes, sets a charging or discharging mode of the bi-directional converter 17, and controls charging and discharging of the second battery pack 16 according to the set mode;
a second relay 20 controlling opening and closing of an electric circuit connecting the charging socket 10 and the bi-directional converter 17;
a third relay 21 for controlling the opening and closing of an electric circuit connecting the bi-directional converter 17 and the refrigerating/refrigerating facility 30 installed in the loading box C of the vehicle;
Battery mounting window 40 installed in the loading box (C) of the vehicle;
A volatile organic compound gas sensor installed in the battery mounting window 40 and detecting off-gas of the electrolyte component leaking from the second battery pack 16 and converting it into an electrical signal and transmitting it to the second control unit 19 (41);
an exhaust fan 42 that operates according to a control signal of the second control unit 19 and ventilates by discharging gas inside the battery mounting window 40;
a thermo-hygrostat 43 which circulates indoor and outdoor air to maintain constant air temperature and humidity inside the battery mounting window 40;
a pressure sensor 44 that measures the pressure inside the battery mounting window 40, converts it into an electrical signal, and transmits it to the second controller 19;
a pressure reducing valve 45 for lowering the pressure by discharging it to the outside when the pressure of air and gas inside the battery mounting window 40 rises above a set pressure according to a control signal from the second control unit 19; and
a vacuum tank 46 connected to the pressure reducing valve 45 to discharge the gas inside the battery mounting window 40 by a pressure difference;
A battery charging method for a specially equipped electric vehicle comprising the following steps using a battery charging system for a specially equipped electric vehicle.
(A) the first controller 14 confirming whether or not a charger connector of an electric vehicle service equipment (EVSE) is connected to the charging socket 10 of the vehicle.
(B) The first control unit 14 checks the vehicle's engine off state, and the second control unit 19 checks the operation off state of the refrigerating and refrigerating equipment 30 installed in the loading box (C) of the vehicle. step to do
(C) determining, by the first controller 14, whether there is a request for charging the second battery pack 16 from the second controller 19;
(D) If there is no request for charging the second battery pack 16 from the second control unit 19, whether or not communication is compatible between the first control unit 14 and the EVCC 25 of the vehicle is checked, and if normal, the Charging the first battery pack 11 by turning on the first relay 15 and operating the bi-directional OBC 12
(E) When the first controller 14 checks the state of charge (SOC) of the first battery pack 11 through the first BMS 13 and reaches a predetermined range, charging is completed. step to do
(F) When there is a request for charging the second battery pack 16 from the second control unit 19, whether or not communication between the second control unit 19 and the EVCC 25 of the vehicle is compatible is checked. Charging the second battery pack 16 by turning on the second relay 20 and turning off the third relay 21 and operating the bidirectional converter 17
(G) The second control unit 19 checks the state of charge (SOC) of the second battery pack 16 through the second BMS 18 and completes charging when it reaches a predetermined range. step to do
delete delete According to claim 1,
After the step (E), the second control unit 19 checks the remaining battery capacity of the second battery pack 16 and if it is less than a predetermined range, the step (F) is immediately followed,
After the step (G), the first control unit 14 checks the remaining battery capacity of the first battery pack 11 and if it is less than a predetermined range, the step (D) is performed immediately after the battery of the electric special vehicle. charging method.

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