KR20210011676A - Electric vehicle charge control system - Google Patents

Abstract

According to one embodiment of the present invention, an electric vehicle charging control system includes: a charging control device including a processor managing a state of an electric vehicle battery while controlling and monitoring the charging of the electric vehicle battery through communication with the electric vehicle supply equipment (EVSE); and a server estimating a state of charge (SOC) value and a state of health (SOH) value based on state information of the electric vehicle battery received from the charging control device, and diagnosing whether the electric vehicle battery is malfunctioning. The processor can comprise one single piece of hardware. Therefore, the system is capable of considerably improving charging efficiency in contrast to existing cases.

Description

Electric vehicle charging control system {ELECTRIC VEHICLE CHARGE CONTROL SYSTEM}

The present invention relates to an electric vehicle charging control system, and more particularly, a charging control device in which a battery management system (BMS) of an electric vehicle and an electric vehicle communication controller (EVCC) are integrated into one hardware. The present invention relates to an electric vehicle charging control system that enhances electric vehicle charging efficiency, security, and convenience for vehicle users.

In general, the built-in Battery Management System (BMS) to manage the battery status of an electric vehicle is largely in the form of Master-Pack-Slave or Master-Slave. It is composed of a form.

The master BMS receives the voltage of the battery cell from the slave BMS or pack BMS, calculates a state of charge (SOC), and acts as a main relay controller in the actual power transmission process. As the master BMS does not measure the actual cell voltage or performs cell balancing like the slave BMS, it does not require a separate BMS chip and is driven by the Real Time Operating System (RTOS).

Meanwhile, an Electric Vehicle Communication Controller (EVCC) for communication with a charger of an electric vehicle refers to a power line communication (PLC) modem for an electric vehicle that has a built-in communication standard for rapid and slow charging of an electric vehicle. Electric vehicles use EVCC to communicate with chargers, control and monitor charging status, and perform payment or authentication functions.

In general, the components of an electric vehicle are connected by one CAN line, which increases the CAN bus load rate, and causes data loss and delay in the CAN communication process. BMS and EVCC exist as separate modules in the electric vehicle battery charging process and operate by exchanging information through CAN communication. As with other configurations, BMS and EVCC also increase the above-described CAN bus load rate, data loss and delay, etc. Is not free from the problem of That is, the overhead generated in CAN communication between the BMS and EVCC existing as a separate configuration causes the charging of the electric vehicle to be disturbed.

In addition, information and messages exchanged during a communication process between an electric vehicle and a charger are currently being transmitted and received without encryption, which poses a vulnerability to security. In other words, in the current electric vehicle charging system, there is always a risk of problems due to security, such as damaging the electric vehicle by causing damage or malfunctioning due to malicious billing adjustment through hacking of the charger during the charging process.

In addition, the configuration for charging and communicating the electric vehicle currently used does not perform other functions other than communicating with the charger. However, considering that various services are constantly required due to the characteristics of electric vehicles, the configuration for charging and communication of electric vehicles is changed to perform various functions by forming networks with various communication devices as well as chargers. I need it.

Republic of Korea Patent Publication No. 10-2017-0068126 (2017.06.19)

The present invention is to solve the above-described problem, and currently, a battery management system (BMS) and an electric vehicle communication controller (EVCC) each composed of separate devices are software-based in one hardware. An object of the present invention is to provide an electric vehicle charging control system that simplifies the configuration of an electric vehicle control unit (ECU) and improves charging efficiency.

In addition, the purpose of providing an electric vehicle charging control system capable of providing various communication standards and services for electric vehicles continuously developed by encrypting the process of the electric vehicle communication with the charger is enhanced. have.

An electric vehicle charging control system according to an embodiment of the present invention includes a processor for controlling and monitoring charging of an electric vehicle battery through communication with an Electric Vehicle Supply Equipment (EVSE) while managing the state of the electric vehicle battery. Based on the state information of the electric vehicle battery received from the charging control device and the charging control device, the state of charge (SOC) and the remaining life value (State of Health: SOH) are estimated, and the electric vehicle battery is broken. It includes a server for diagnosing whether or not, but the processor may be configured with one piece of hardware.

The charging control device according to an embodiment of the present invention may include a security module for encrypting a communication message between an electric vehicle and a charger and storing a certificate.

The security module according to an embodiment of the present invention transmits a certificate including a pre-stored private key to a server through a charger at the time of initial charging, and transmits a certificate chain generated based on a certificate including a pre-stored private key from the server to the charger. The certificate chain can be verified by receiving via.

The charging control device according to an embodiment of the present invention may include a communication module supporting Ethernet communication for downloading and upgrading firmware of the charging control device.

The state information of an electric vehicle battery according to an embodiment of the present invention may include at least one of a voltage of a battery cell, a temperature of a battery cell, a state of charge value, and a battery manufacturing year measured by a processor.

The server according to an embodiment of the present invention divides the state information of the electric vehicle battery by type of the electric vehicle battery and stores it in a database, and estimates the average value of the charge state value and the remaining life value for each electric vehicle battery of the same type. can do.

The processor according to an embodiment of the present invention may correct the state of charge value and the remaining life value of the electric vehicle battery based on the average value of the state of charge value and the average value of the remaining life value estimated by the server.

The electric vehicle charging control system according to an embodiment of the present invention may further include a user terminal capable of running an application for outputting a state of charge value, a remaining life value of the electric vehicle battery, and whether the electric vehicle battery has failed. .

According to the electric vehicle charging control system provided as an embodiment of the present invention, the BMS and EVCC are integrated to simplify the ECU configuration of the electric vehicle, thereby reducing the cost and unit cost for the hardware configuration and reducing the CAN bus load rate. Thus, charging efficiency can be significantly improved compared to the prior art.

In addition, since the BMS and EVCC are integrated to perform AC slow and DC fast charging, which conventional EVCCs could not perform, the charging service area can be broadly expanded, and debugging points can be unified in case of a charging error.

In addition, since the charging message can be encrypted during the charging process of the electric vehicle and authentication using a private key can be performed, security can be greatly improved, and interlocking of additional services can be easily performed in the future by establishing a network using Ethernet communication. I can.

1 is a block diagram showing an electric vehicle charging control system according to an embodiment of the present invention.
2 is a block diagram showing a conventional control unit for charging an electric vehicle battery.
3 is a block diagram showing a control unit for charging an electric vehicle battery according to an embodiment of the present invention.
4 is a sequence diagram illustrating a change in a CAN bus load rate of a charging control device according to an embodiment of the present invention compared to the prior art.
5 is a conceptual diagram illustrating functions of a processor according to an embodiment of the present invention.
6 to 7 are conceptual diagrams showing an authentication process of a security module according to an embodiment of the present invention.
8 is a block diagram illustrating a process of processing battery status information between a charging control device and a server according to an embodiment of the present invention.

The terms used in the present specification will be briefly described, and the present invention will be described in detail.

The terms used in the present invention have been selected from general terms that are currently widely used while considering functions in the present invention, but this may vary depending on the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

When a part of the specification is said to "include" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated. In addition, terms such as "module" and "unit" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. In addition, when a part is said to be "connected" with another part throughout the specification, this includes not only a case in which it is "directly connected", but also a case in which a part is connected "with another configuration in the middle."

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

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

1 is a block diagram showing an electric vehicle charging control system according to an embodiment of the present invention.

Referring to FIG. 1, an electric vehicle charging control system according to an embodiment of the present invention receives battery-related information from a charging control device 100 built in an electric vehicle battery and a plurality of charging control devices 100, It may include a user terminal 300 capable of receiving various services related to an electric vehicle as well as information related to an electric vehicle battery through communication with the server 200 and the server 200 to be analyzed. The charging control device 100 may perform communication for charging through connection with the charger 400 (Electric Vehicle Supply Equipment: EVSE), and the server 200 may manage and control the charger 400. I can.

Referring to FIG. 1, the charging control apparatus 100 according to an embodiment of the present invention manages the state of the electric vehicle battery and simultaneously controls and monitors the charging of the electric vehicle battery through communication with the charger 400 ( 10) may be included. The processor 10 refers to one hardware configuration in which the functions of a conventional battery management system (BMS) and an electric vehicle communication controller (EVCC) are integrated. That is, the processor 10 may implement the functions of the battery management system and the communication controller in software in one hardware.

For example, the processor 10 consisting of a single integrated circuit board may include main relay control, overvoltage or overcurrent protection, state of charge (SOC) and remaining life (SOH) calculations. It can perform functions of the battery management system. At the same time, the processor 10 monitors the state of charge of the battery by controlling communication with the charger 400 connected to the electric vehicle, and controls all of the AC slow charging as well as DC fast charging. Can be done. In this case, the processor 10 in which the above two functions are integrated may be designed to satisfy ISO/IEC 15118, which is the latest charging communication specification.

Referring to FIG. 1, the charging control device 100 according to an embodiment of the present invention may include a security module 20 for encrypting a communication message between an electric vehicle and a charger 400 and storing a certificate. . The security module 20 is not simply a database for storing and managing encrypted information, but an encrypted hardware configuration. In the security module 20, a private key and a certificate for encryption may be stored in advance when the electric vehicle is manufactured and shipped. The security module 20 may perform authentication for the charger 400 and the server 200 using the private key and certificate stored in advance as described above.

Referring to FIG. 1, a charging control device 100 according to an embodiment of the present invention may include a communication module 30 supporting Ethernet communication for downloading and upgrading firmware of the charging control device 100. . That is, the charging control device 100 may establish an Ethernet communication network through the communication module 30 to receive additional services such as firmware download and upgrade for the processor 10. In addition, since the processor 10 can be interlocked with a unit such as an On Board Charger (OBC) constituting an electric vehicle through CAN communication, the charging control device 100 is a processor through the communication module 30. Additional services can be provided for other configurations capable of interworking with (10) and CAN communication.

Referring to FIG. 1, the server 200 according to an embodiment of the present invention estimates a state of charge value and a remaining life value based on state information of an electric vehicle battery received from the charge control device 100, and It is possible to diagnose whether the car battery is broken. In this case, the state information of the electric vehicle battery generated by the processor 10 may include at least one of a voltage of a battery cell, a temperature of a battery cell, a state of charge value, or a battery manufacturing year measured by the processor 10. . In addition, the state of charge value and the remaining life value estimated by the server 200 are based on the state information of the battery collected from a plurality of charge control devices 100, not values calculated by the single charge control device 100 by itself. Refers to the estimated value.

That is, the server 200 according to an embodiment of the present invention analyzes the state information of the battery as in the above-described example, and corrects the state of charge value and the remaining life value calculated by the charging control device 100. Value can be estimated. In this way, the correction values estimated by the server 200 (ie, the state of charge value and the remaining life value estimated by the server 200) are transmitted to the processor 10 of the charge control device 100 to provide the state of charge value and the remaining value. It can be used for correction of the lifetime value. In addition, the server 200 compares the status information of the battery received from the specific charge control device 100 with the status information of other batteries previously stored in the database, and whether a specific battery is currently in a failed state based on the comparison result. Can judge.

Referring to FIG. 1, in the user terminal 300 according to an embodiment of the present invention, an application for outputting a state of charge value, a remaining life value of an electric vehicle battery, and whether the electric vehicle battery is broken may be driven. The user can check the information analyzed by the server 200 by driving the application of the user terminal 300 as well as control the start and end of charging of the electric vehicle. The user terminal 300 for driving the application may be a smartphone, a portable multimedia player (PMP), personal digital assistants (PDA), a desktop PC, a laptop PC, a tablet PC, or the like.

2 is a block diagram showing a conventional control unit for charging an electric vehicle battery, and FIG. 3 is a block diagram showing a control unit for charging an electric vehicle battery according to an embodiment of the present invention.

Referring to FIG. 2, in a conventional control unit for charging an electric vehicle battery, a battery management system and a communication controller are formed as separate modules. The battery management system and communication controller composed of separate modules transmit and receive 20 CAN messages at a cycle of 100ms, and exchange charging information and status to control electric vehicle charging. However, when the battery management system and the communication controller perform functions through CAN communication, if the CAN communication is not good (i.e. when the CAN bus load rate is increased), a problem such as termination of charging occurs.

Referring to FIG. 3, unlike the prior art, the control unit for charging an electric vehicle battery according to an embodiment of the present invention uses a processor 10 in which a battery management system and a communication controller are integrated, thereby solving the problems of the CAN communication method described above. Solve. That is, since one processor 10 simultaneously performs each function of the battery management system and the communication controller, it is possible to minimize the influence of CAN communication and increase charging efficiency. In addition, since one processor 10 simultaneously performs each function of the battery management system and the communication controller, it is possible to smoothly perform AC slow charging, which was not performed by the conventional communication controller.

4 is a sequence diagram showing a change in a CAN bus load rate of the charging control device 100 according to an embodiment of the present invention compared to the prior art.

Referring to the sequence diagram on the left side of FIG. 4, the conventional battery management system and the communication controller transmit and receive 20 CAN communication messages with a cycle of 100 ms. As the charging specification is upgraded, the number of messages that the conventional battery management system and the communication controller must exchange with each other is inevitably increased. This will inevitably cause an overload in sending and receiving messages for charging.

On the other hand, referring to the sequence diagram on the right side of FIG. 4, the charging control device 100 according to an embodiment of the present invention uses a processor 10 incorporating a battery management system and a communication controller. The load rate can be significantly reduced. That is, even without performing a separate CAN communication, the charger 400 and the processor 10 can directly exchange messages with each other to perform charging, so that charging efficiency can be significantly improved compared to the prior art.

5 is a conceptual diagram showing functions of the processor 10 according to an embodiment of the present invention.

Referring to FIG. 5, functions of the processor 10 according to an embodiment of the present invention can be broadly classified into a battery management system function, a communication controller function, and an integrated communication function. The Relay Contorl block, Voltage & Current block, Protection block, and Diagnosis block displayed on the left side of the processor 10 represent functions of the battery management system. The HPGP+PLC block, actuator block, and charging block displayed on the right side of the processor 10 represent functions of the communication controller. In addition, the Power block and Communication block displayed on the right side of the processor 10 represent an integrated communication function required in the process of integrating the battery management system and the communication controller. Through such a functional configuration, one hardware processor 10 can simultaneously perform the functions of the battery management system and the communication controller.

6 to 7 are conceptual diagrams showing an authentication process of the security module 20 according to an embodiment of the present invention.

Referring to (a) of FIG. 6, the security module 20 according to an embodiment of the present invention may store a V2G root certificate, an OEM provisioning certificate, and a private key for message encryption in advance in the electric vehicle shipment stage. Referring to FIG. 6B, the security module 20 may transmit a certificate including a pre-stored private key to the server 200 through the charger 400 at the time of initial charging. That is, the security module 20 can deliver the OEM provisioning certificate including the V2G root certificate to the charger 400, and the certificates transferred to the charger 400 are servers through wireless communication between the charger 400 and the server 200. It can be delivered to 200.

Referring to FIG. 7A, the server 200 according to an embodiment of the present invention may generate a certificate chain based on an OEM provisioning certificate including a V2G root certificate transmitted from the security module 20. The certificate chain generated by the server 200 may be transmitted to the security module 20 through the charger 400. Referring to (b) of FIG. 7, the security module 20 may verify a certificate chain transmitted from the server 200 based on a certificate including a pre-stored private key. The security module 20 may encrypt and decrypt messages in the charging process through this verification process. That is, the security module 20 performs authentication work for the charger 400 and the server 200 using a pre-stored certificate and private key, and through this, the message exchanged during the charging process can be safely protected from external hacking. I can.

8 is a block diagram illustrating a process of processing battery status information between the charging control device 100 and the server 200 according to an embodiment of the present invention.

Referring to FIG. 8, the charging control device 100 according to an embodiment of the present invention provides a voltage of a battery cell corresponding to state information of a battery, a temperature of a battery cell, a state of charge value, and a battery manufacturing through the processor 10. The year and state values may be measured and transmitted to the server 200. In this case, the server 200 may classify battery state information by battery capacity and manufacturer, and store the information in the database. That is, the server 200 may classify state information of the electric vehicle battery according to the type of the electric vehicle battery and store it in the database.

Even if the same battery is used for the same period, the state of charge value and the remaining life value may slightly differ due to chemical characteristics, so that the server 200 can compensate for this difference, the server 200 is configured to calculate the state of charge value for each battery of the same type of electric vehicle. The average value of the average value and the remaining life value can be estimated. The estimated average value of the charge state value and the remaining life value for each electric vehicle battery of the same type may be transmitted to the charging control device 100.

Referring to FIG. 8, the processor 10 according to an embodiment of the present invention provides a state of charge value and a remaining life of an electric vehicle battery based on the average value of the state of charge value and the average value of the remaining life value estimated by the server 200. Value can be corrected. That is, the processor 10 of the charging control device 100 recalculates the average value of the self-calculated state of charge value and the remaining life value using the average value of the state of charge value and the remaining life value sent from the server 200. Correcting errors can be performed by performing the process. Through this process, the accuracy of the state of charge value and the remaining life value calculated by the charge control device 100 may be improved.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. .

10: processor 20: security module
30: communication module 100: charging control device
200: server 300: user terminal
400: charger

Claims (8)

In the electric vehicle charging control system,
A charging control device including a processor for controlling and monitoring charging of the electric vehicle battery through communication with an Electric Vehicle Supply Equipment (EVSE) while managing the state of the electric vehicle battery; And
Based on the state information of the electric vehicle battery received from the charging control device, a state of charge (SOC) and a remaining life value (State of Health: SOH) are estimated, and a failure of the electric vehicle battery is diagnosed. Including a server that,
The processor is an electric vehicle charging control system, characterized in that consisting of one piece of hardware.
The method of claim 1,
The charging control device,
An electric vehicle charging control system comprising a security module for encrypting a communication message between the electric vehicle and the charger and storing a certificate.
The method of claim 2,
The security module,
Upon initial charging, a certificate including a pre-stored private key is transmitted to the server through the charger, and a certificate chain generated based on the certificate including the pre-stored private key is received from the server through the charger, and the certificate chain Electric vehicle charging control system, characterized in that to verify the.
The method of claim 1,
The charging control device,
An electric vehicle charging control system comprising a communication module supporting Ethernet communication for downloading and upgrading firmware of the charging control device.
The method of claim 1,
In the state information of the electric vehicle battery,
An electric vehicle charging control system comprising at least one of a voltage of a battery cell measured by the processor, a temperature of a battery cell, the state of charge value, and a battery manufacturing year.
The method of claim 1,
The server,
Electric vehicle charging control, characterized in that the status information of the electric vehicle battery is classified by type of the electric vehicle battery and stored in a database, and the average value of the charge state value and the remaining life value are estimated for each electric vehicle battery of the same type system.
The method of claim 6,
The processor,
An electric vehicle charging control system, comprising correcting a state of charge value and a remaining life value of the electric vehicle battery based on an average value of an average value of a state of charge value and an average value of a remaining life value estimated by the server.
The method of claim 1,
The electric vehicle charging control system, characterized in that it further comprises a user terminal capable of driving an application for outputting the state of charge value, the remaining life value of the electric vehicle battery, and whether the electric vehicle battery has failed.

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