KR20210082763A - The method of charging master battery and slave battery simulateneously in electric vehicle - Google Patents

Abstract

The present invention relates to an electric vehicle, which simultaneously charges a master battery and a slave battery, and a charging method thereof. A charger has two charging cables. In the present invention, two batteries in which a master battery and a slave battery are connected in parallel or in series are installed in the electric vehicle. Two inlets are also installed in the electric vehicle, wherein each of the inlets is connected to the master battery and the slave battery. Under the conditions, the present invention proposes a technique for simultaneously charging the master battery and the slave battery. If a novel high-capacity battery is developed and installed to increase mileage, cost becomes very high. However, it is more effective to connect two batteries with low capacity and charge the two batteries at the same time or individually.

Description

An electric vehicle charging method that simultaneously charges a master battery and a slave battery {THE METHOD OF CHARGING MASTER BATTERY AND SLAVE BATTERY SIMULATENEOUSLY IN ELECTRIC VEHICLE}

The present invention relates to an electric vehicle, and more particularly to a method for charging a battery of an electric vehicle.

Electric vehicles run on battery power. Therefore, it has to go through a process called battery charging. The next issue after charging the battery is the mileage. Since the mileage of an electric vehicle depends on the capacity of the battery, a large-capacity battery has the advantage of being able to extend the mileage. However, in order to charge a large-capacity battery, a technology that increases the charging power is required, and above all, it encounters a realistic barrier. It is a matter of cost. As the capacity of the battery increases, the price of the battery increases significantly. In addition, a more complex vehicle system is required, and there is a problem in that the capacity of a rapid charger for rapidly charging an electric vehicle is proportionally increased. In other words, there are also problems with the infrastructure.

So, although everyone knows that using a large-capacity battery is theoretically good, it is not easy to install and use such a large-capacity battery in a commercial electric vehicle.

The inventor of the present invention has completed the present invention after long research and development on how to effectively solve this problem.

It is an object of the present invention to propose a method of simultaneously charging two or more low-capacity batteries, instead of charging one large-capacity battery as described above.

On the other hand, other objects not specified in the present invention will be additionally considered within the range that can be easily inferred from the following detailed description and effects thereof.

In order to achieve the above object, the first aspect of the present invention is an electric vehicle that simultaneously charges a master battery and a slave battery:

The vehicle is provided with a first inlet for charging the master battery and a second inlet for charging a slave battery whose battery capacity is less than or equal to that of the master battery, and the master battery and the slave battery use a relay. It consists of a parallel battery system connected in parallel by

When the EV controller managing the parallel battery system starts dual charging by connecting the first plug of the infrastructure charger to the first inlet and the second plug of the infrastructure charger to the second inlet, the relay It is controlled to be opened, and a charging message including charging parameters of the master battery and the slave battery is independently transmitted to the infrastructure charger through a PLC modem that communicates with the infrastructure charger through a power line.

In addition, in the electric vehicle for simultaneously charging the master battery and the slave battery according to a preferred embodiment of the present invention, in the protocol performed between the vehicle and the infrastructure charger, Cable Check, PreCharge, Power Delivery Start, Current Demand, Power Delivery Stop and Welding Detection may request and respond independently to each of the master battery and the slave battery.

In addition, a second aspect of the invention is an electric vehicle that simultaneously charges a master battery and a slave battery:

The vehicle is provided with a first inlet for charging a master battery and a second inlet for charging a slave battery having a battery capacity equal to or less than that of the master battery, and the master battery and the slave battery are connected in series It consists of a dual battery system that

When the EV controller that manages the dual battery system starts dual charging by connecting the first plug of the infrastructure charger to the first inlet and the second plug of the infrastructure charger to the second inlet, the infrastructure charger It is characterized in that each independently transmits a charging message including charging parameters of the master battery and the slave battery to the infrastructure charger through a PLC modem communicating with the power line.

In addition, a third aspect of the present invention is an electric vehicle charging method for simultaneously charging a master battery and a slave battery:

The first plug of the infrastructure charger is connected to the first inlet for charging the master battery of the electric vehicle, and the second plug of the infrastructure charger is used to charge the slave battery having a capacity equal to or less than that of the master battery. setting up one infrastructure charger and one electric vehicle in a charging relationship of 2:2 by connecting to a second inlet for

independently transmitting, by the electric vehicle, a charging message including charging parameters of the master battery and the slave battery to the infrastructure charger through a PLC modem that communicates with the infrastructure charger; and

Charging the master battery and the slave battery at the same time, while charging is in progress, the electric vehicle maintains communication so that the insulation and battery status of the master battery and the slave battery are periodically monitored by the infrastructure charger control device. characterized by including.

According to the present invention, it is possible to more effectively increase the battery capacity of the electric vehicle, and accordingly, there is an advantage that the mileage can be more economically increased. The electric vehicle of the present invention has a built-in master battery and a slave battery, which can be charged at the same time and can be individually charged, so that the system configuration can be flexibly. Charging time can also be shortened.

The advantage of the present invention in that two batteries must be installed is expected to be more advantageous for commercial vehicles than for small electric vehicles.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effects described in the following specification expected by the technical features of the present invention and their potential effects are treated as described in the specification of the present invention.

1 conceptually shows the configuration and relationship of the electric vehicle 10 and the infrastructure charger 20 in the present invention.
2 shows a configuration example of the electric vehicle internal battery charging unit 100 according to a preferred embodiment of the present invention.
3 shows a more detailed internal charge control system in an electric vehicle in which a parallel battery system 150 of a master battery 151 and a slave battery 152 is constructed in a preferred embodiment of the present invention.
4 schematically shows a procedure for charging a master battery and a slave battery between the electric vehicle 10 and the charger 20 in a preferred embodiment of the present invention.
FIG. 5 shows in detail a communication protocol performed between the electric vehicle 10 and the charger 20 .
※ It is revealed that the accompanying drawings are exemplified as a reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereby.

Hereinafter, with reference to the drawings, the configuration of the present invention guided by various embodiments of the present invention and effects resulting from the configuration will be described. In the description of the present invention, if it is determined that the subject matter of the present invention is unnecessarily obscure as it is obvious to those skilled in the art with respect to related known functions, the detailed description thereof will be omitted.

1 conceptually shows the configuration and relationship of an electric vehicle 10 and an electric vehicle supply equipment (EVSE) 20 according to the technical idea of the present invention.

In the electric vehicle 10 of the present invention, two inlets 11 and 12 for charging the battery are installed. The built-in battery corresponds one-to-one with the inlets 11 and 12). Therefore, as will be described later, a master battery and a slave battery, and two batteries are built-in.

Since there are two driving batteries, it is not only possible to charge one of the two batteries, but it is also possible to charge both batteries at the same time. The present invention relates in particular to the technique of charging two batteries simultaneously. There are two ways to charge the battery: DC fast charging and AC slow charging.

The infrastructure charger 20 has two charging cables 23 , 25 . The plugs 21 and 22 of the charging cables 23 and 25 are inserted into the inlets 11 and 12 of the electric vehicle 10 to perform charging. The user executes a predetermined process related to the charging method and payment on the display screen 29 .

Conventionally, infrastructure chargers and electric vehicles have been connected one-to-one or two-to-one. Since electric vehicles have only one battery and only one inlet, only one plug of the charger can be plugged in. Unplugged charging cables do nothing or charge other electric vehicles. However, in the present invention, for example, by plugging the charging plug 21 into the first inlet 11 , and connecting the charging plug 22 to the second inlet 12 , one electric vehicle is converted into two plugs 21 and 22 . It becomes possible to charge the built-in battery at the same time.

On the other hand, various plug types may be used. As long as it is a plug that can be inserted into the inlets 11 and 12 and used, the type is not limited. For example, a DC charging type plug such as CCS1, CCS2, or CHAdeMO may be used. You can also use AC charging type plugs such as J1772 and Mennekes. The inlets 11 and 12 to which such a plug can be connected may be installed in various positions of the vehicle. Any position may be used as long as the function of the inlet capable of charging the battery by inserting the plugs 21 and 22 can be realized.

When the inlets 11 and 12 and the plugs 21 and 22 are connected and payment is determined, the infrastructure charger 20 supplies power to the electric vehicle 10 through two routes and communicates in real time at the same time. It is preferable to perform power line communication as described later.

2 schematically shows the configuration of a battery charging unit 100 inside an electric vehicle according to a preferred embodiment of the present invention.

As described above, the master battery 51 and the slave battery 52 are installed inside the electric vehicle. Preferably, the capacity of the slave battery 52 is equal to or smaller than the capacity of the master battery. For example, the master battery 51 and the slave battery 52 may be batteries with the same capacity and the same specification. In addition, the capacity of the master battery 51 may be larger than the capacity of the slave battery 52 and may be a battery having a larger physical standard. For example, the capacity of the master battery 51 may be 60 kwh, and the slave battery 52 may be configured as a battery having a capacity of 40 kwh.

In a preferred embodiment, the master battery 51 and the slave battery 52 may be connected in parallel. In this case, the master battery 51 and the slave battery 52 are connected by a relay. In another preferred embodiment, the master battery 51 and the slave battery 52 may be connected in series. In any embodiment, during charging, the master battery 51 and the slave battery 52 operate to be electrically insulated.

The battery charging unit 100 includes a hybrid EV controller (HEVC) 110 , a PLC modem 120 , and a Battery Management System (BMS) 130 .

The HEVC 110 manages two charging systems, a charging system for charging the master battery 51 and a charging system for charging the slave battery 52 . Here, the term 'hybrid' indicates that it is possible to charge only one of the two batteries, and it is also possible to charge dual batteries at the same time.

The PLC modem 120 serves to communicate according to a communication protocol with the infrastructure charger in the process of simultaneously charging two batteries using the charging system of the present invention. Communication with the charger through the PLC modem 120 is done by power line communication (Power Line Communication). According to the configuration of the PLC modem 120, when the plug of the charger is inserted into the inlet of the vehicle and connected, the power line communication becomes possible.

The BMS 130 manages the charging and state of the battery and transmits the battery information to the HEVC 110 .

Fig. 3 more specifically illustrates the internal configuration of Fig. 2 according to a preferred embodiment of the present invention.

3 particularly relates to a parallel battery system 150 in which a master battery 51 and a slave battery 52 are connected in parallel. The master battery 51 and the slave battery 52 are connected by a relay 55. When driving, the master battery 51 and the slave battery 52 are connected in parallel, and when charging, the relay 55 is opened. The electrical connection between the master battery 51 and the slave battery 52 is cut off.

HEVC 110 , PLC modem 120 , OBC (On Board Charger, 140 ), and BMS 130 exchange signals and information with each other through CAN communication.

The PLC modem serves to communicate with the infrastructure charger of an external device, and performs power line communication, not CAN communication, as described above. In order to charge the master battery 51 and the slave battery 52, continuous communication is made, which will be described later. However, since it is necessary to transmit two battery charging messages to the charger with one PLC modem, the ECU inside the PLC modem is preferably composed of a mother ECU and a child ECU. In addition, the control of master battery charge-related messages exchanges charge messages with the mother ECU as a priority.

The HEVC 110 that manages the vehicle's charging system manages the vehicle's charging system based on the battery information received from the BMS 130. In a preferred embodiment, the charging-related control of the master battery 151 is prioritized, and the master After the charging of the battery 151 is started, the charging of the slave battery is sequentially managed.

The charging power from the charger transferred through the inlets 11 and 12 charges the master battery 151 or the slave battery 152 constituting the parallel battery system 150 through the DC-BOX 145 .

4 schematically shows a process of connecting and charging the electric vehicle 10 and the infrastructure charger 20 according to an embodiment of the present invention.

Preferably, the charging sequence by connecting the plug proceeds in the order of the master battery and the slave battery.

The user may select a dual battery charging process on the display screen of the infrastructure charger 20 (S100). In this step S100, it is also good to first plug in all the charging cables to the inlets of the electric vehicle, that is, to proceed after step S120.

By inserting a plug of any one charging cable of the infrastructure charger 20 into the first inlet of the electric vehicle 10, the plug-in for the master battery is performed (S110). Next, the plug-in of the slave battery is performed by inserting the plug of another charging cable of the infrastructure charger 20 into the second inlet of the electric vehicle 10 (S120).

Steps S110 and S120 are each performed independently, and thus a setup process is initiated by a protocol between the electric vehicle 10 and the infrastructure charger 20 .

The electric vehicle 10 and the infrastructure charger 20 exchange a charging message for the master battery by a predetermined process and charge the master battery (S130). In addition, the electric vehicle 10 and the infrastructure charger 20 exchange a charging message for the slave battery by a predetermined process to charge the slave battery (S140). Each detailed process of step S130 and step S140 is performed independently of each other.

When charging is completed, the procedure for the master battery is terminated (S150), and similarly, the charging procedure for the slave battery is terminated (S160).

In the present invention, the communication process performed as a request and a response in the process of charging between the electric vehicle 10 and the infrastructure charger 20 as shown in FIG. 5 is a process for a master battery and a process for a slave battery are executed independently of each other. Protocols can be executed concurrently, independently of each other, or with a slight time difference between them. In any case, it should be added that the charging process for the slave battery is started only after the charging process for the master battery is finished.

Communication and power transmission between the electric vehicle 10 and the infrastructure charger 20 can be divided into three phases. These are setup, charging and finalization.

The user connects the charging cable to the car. Then, the electric vehicle 10 and the infrastructure charger 20 sense the current and initiate a control pilot protocol. The communication protocol at this time is defined in IEC61851. When the electric vehicle 10 and the charger 20 are prepared, the two devices initiate a connection by the SLAC determined by the HPGP (HomePlug Green PHY) power line communication technology for PLC communication. In this way, after the two devices are electrically connected and PLC connection is also established, preferably, the electric vehicle 10 sends an SDP packet to the charger 20 to identify the IP address and port number of the charger and makes a TCP connection. The electric vehicle 10 and the charger 20 control the charging procedure by exchanging TCP packets with each other, which are setup, charging, and termination, as mentioned above. And these conventions are defined in ISO15118.

The setup includes the following process as shown in FIG. 5 .

- Supported Application Protocol Request

- Supported Application Protocol Response

- Session Setup Request

- Session Setup Response

- Service Discovery Request

- Service Discovery Response

- Payment Service Selection Request

- Payment Service Selection Response

- Payment Details Request (PNC)

- Payment Details Response (PNC)

- Authorization Request

- Authorization Response

- Charge parameter Discovery Request

- Charge parameter Discovery Response

In the setup procedure above, service information regarding dual simultaneous charging, protocol version, payment method, user identity information, and charging current, voltage, and power information required by the vehicle's battery system are included for the master battery and the slave battery independently of each other. Various parameters are exchanged. That is, from the perspective of the electric vehicle, the charging parameters of the master battery and the slave battery are each independently transmitted to the charger.

The charging phase includes the following processes.

- Cable Check Request

- Cable Check Response

- PreCharge Request

- PreCharge Response

- Power Delivery (start) Request

- Power Delivery (start) Response

- Current Demand Request

- Current Demand Response

- Power Delivery (stop) Request

- Power Delivery (stop) Response

- Welding Detection Request

- Welding Detection Response

In the above charging procedure, energy is transferred from the charger to the electric vehicle. During energy transfer, the master battery and the slave battery must independently exchange status information, and each independently requests and responds.

Finally, in the termination procedure, safety should be checked before disconnecting the connection.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

Claims (6)

The vehicle is provided with a first inlet for charging the master battery and a second inlet for charging a slave battery whose battery capacity is less than or equal to that of the master battery, and the master battery and the slave battery use a relay. It consists of a parallel battery system connected in parallel by
When the EV controller managing the parallel battery system starts dual charging by connecting the first plug of the infrastructure charger to the first inlet and the second plug of the infrastructure charger to the second inlet, the relay Control to be opened, characterized in that each independently transmits a charging message including charging parameters of the master battery and the slave battery to the infrastructure charger through a PLC modem that communicates with the infrastructure charger, a master battery and An electric vehicle that simultaneously charges the slave battery.
According to claim 1,
In the protocol performed between the vehicle and the infrastructure charger, Cable Check, PreCharge, Power Delivery Start, Current Demand, Power Delivery Stop, and Welding Detection independently request and respond to the master battery and the slave battery. Response) is performed, an electric vehicle that simultaneously charges a master battery and a slave battery.
The vehicle is provided with a first inlet for charging a master battery and a second inlet for charging a slave battery having a battery capacity equal to or less than that of the master battery, and the master battery and the slave battery are connected in series It consists of a dual battery system that
When the EV controller that manages the dual battery system starts dual charging by connecting the first plug of the infrastructure charger to the first inlet and the second plug of the infrastructure charger to the second inlet, the infrastructure charger An electric vehicle charging a master battery and a slave battery at the same time, characterized in that each independently transmits a charging message including charging parameters of the master battery and the slave battery to the infrastructure charger through a PLC modem communicating with a power line .
The first plug of the infrastructure charger is connected to the first inlet for charging the master battery of the electric vehicle, and the second plug of the infrastructure charger is used to charge the slave battery having a capacity equal to or less than that of the master battery. setting up one infrastructure charger and one electric vehicle in a charging relationship of 2:2 by connecting to a second inlet for
independently transmitting, by the electric vehicle, a charging message including charging parameters of the master battery and the slave battery to the infrastructure charger through a PLC modem that communicates with the infrastructure charger; and
Charging the master battery and the slave battery at the same time, while charging is in progress, the electric vehicle maintains communication so that the insulation and battery status of the master battery and the slave battery are periodically monitored by the infrastructure charger control device. An electric vehicle charging method for simultaneously charging a master battery and a slave battery, comprising:
5. The method of claim 4,
The master battery and the slave battery are parallel battery systems connected in parallel using a relay, and the relay is opened during charging.
5. The method of claim 4,
In the protocol performed between the electric vehicle and the infrastructure charger, Cable Check, PreCharge, Power Delivery Start, Current Demand, Power Delivery Stop, and Welding Detection independently request and respond to the master battery and the slave battery. (Response) is done, an electric vehicle charging method for simultaneously charging the master battery and the slave battery.

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