KR101641435B1 - Battery management system and electric vehicles equipped with the same - Google Patents

Abstract

Disclosed is a battery management system for determining whether a failure occurs during operation of a battery management system and recovering a failure, and an electric vehicle equipped with the battery management system. The battery management system includes a plurality of slaves for measuring a cell voltage or a cell temperature for each of a plurality of cells of the battery module and a plurality of slaves for measuring a pack voltage or a pack current of the battery module and measuring a cell voltage, A main communication network for connecting a master and a plurality of slaves, and a sub communication network for connecting a master and a plurality of slaves, wherein one of the plurality of slaves One tester selected by the master generates an operation expression for confirming the operation capability of the target, transmits the operation request signal including the operation expression to the target, and outputs a response including the result value for the operation expression and the operation time from the target And can determine the normal, abnormal or failure state of the target based on the resultant value and the computation time The.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery management system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery management system and an electric vehicle equipped with the battery management system. More particularly, the present invention relates to a battery management system capable of determining a failure during operation of a battery management system, .

The battery management system (BMS) for electric vehicles is a system for managing the batteries of electric vehicles. The battery supplies the power required to run the electric vehicle.

If the battery management system malfunctions, the battery management system is not appropriately managed due to an unusual operation of the battery management system, so that the electric vehicle can not normally operate. Therefore, the failure of the battery management system can be very important in an electric vehicle.

Most of the existing battery management systems check the status of the battery management system periodically by communicating between the upper module and the battery management system to check the failure of the battery management system. However, this method can not confirm the failure of the battery management system by simply using the message period value when the battery management system performs an inaccurate operation due to its own abnormality, and thus may pose a serious risk to battery management. For example, the upper control module, which receives and reports data from the battery management system, operates an electric vehicle based on erroneous information, which may lead to an unexpected situation.

Furthermore, in the existing battery management system for electric vehicles, when the internal communication network is difficult to communicate normally due to network load or noise, or when there is an abnormality in the communication device, the upper module determines the time to stop the operation, However, there is a problem that it can lead to a traffic accident if stopping the operation or continuing the operation due to failure to perform such judgment properly. In particular, if the battery management system is not operated normally due to the characteristics of the electric vehicle, the risk of a traffic accident increases, and the risk of explosion or fire of the battery greatly increases.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a battery management system, And to provide an electric vehicle equipped with the battery management system.

In another embodiment of the present invention, a battery management system capable of determining the failure of a battery management system through redundancy of a communication network between internal modules of the battery management system and monitoring traffic, and improving the stability during operation of the electric vehicle by coping with a failure, And to provide an electric vehicle equipped with the same.

According to an aspect of the present invention, there is provided a battery management system comprising: a plurality of slaves for measuring a cell voltage or a cell temperature of a plurality of cells of a battery module; A master that measures the pack voltage or pack current of the battery module and controls the output power of the battery module according to the cell voltage, the cell temperature, the pack voltage, the pack current, or a combination thereof; A main communication network for connecting a master and a plurality of slaves; And a sub-communication network for connecting a master and a plurality of slaves, wherein one of the plurality of slaves and one tester selected from the master generates an operation expression for confirming the operation capability of the target, An operation request signal is transmitted to the target, a response including the result of the operation expression and the operation time is received from the target, and the normal, abnormal or failure state of the target can be determined based on the result value and the operation time.

In one embodiment, when the tester is the master, the tester compares the RTT (Round Trip Time) corresponding to the reception time of the response after transmission of the operation request signal with a preset time, The slave controlling the use of the sub communication network and the slave having the RTT smaller than the first specific value can use the main communication network.

In one embodiment, the tester may determine that the slave is out of order when the RTT of one or more slaves using the subnetwork is greater than or equal to a second specified value.

In one embodiment, the battery management system may further include a plurality of pairs of power supply lines and a power supply cut-off signal line, which connect each of the plurality of slaves from the master in a predetermined chain in a predetermined order.

In one embodiment, the tester transmits a power down signal to the power down signal line for shutting down the power line connected to the input of the fault slave, and blocks the power of the failed slave for a predetermined time by the power down control signal The faulty slave can be initialized.

According to another aspect of the present invention, there is provided a battery management system including: a plurality of slaves for respectively measuring a cell voltage or a cell temperature of a plurality of cells of a battery module; A master that measures the pack voltage or pack current of the battery module and controls the output power of the battery module according to the cell voltage, the cell temperature, the pack voltage, the pack current, or a combination thereof; A monitoring device for checking the communication capability of the master and the slaves and communication data to determine whether the master or a plurality of slaves are faulty; An internal communication network for connecting a master, a plurality of slaves and a monitoring device; A plurality of additional communication networks connecting the master and the monitoring device and connecting the plurality of slaves and the monitoring device; And an external communication network for connecting the master and the monitoring device to the external module (parent device).

In one embodiment, the monitoring device sends a test message containing command information previously set to at least one of a plurality of slaves and one or more targets selected from the master, receives a response message from the target, And a communication function monitoring unit for determining whether the response message is included in the response message or the response message to another communication network according to the command information and determining one or more targets as a failure according to the determination result.

In one embodiment, the battery management system or the monitoring device may further include a mixing degree monitoring unit for providing a time stamp to the monitoring device or the communication function monitoring unit. The mixing degree monitoring unit may further determine one or more target states (normal, abnormal, failure, etc.) based on the first time stamp included in the test message and the second time stamp generated by the response message.

In one embodiment, the battery management system includes a recovery signal generation unit that provides a recovery signal to a target in a failed state according to a monitoring result of a communication function monitoring unit or a blending degree monitoring unit, .

An electric vehicle according to another aspect of the present invention includes a battery management system of any one of the above embodiments, a battery module controlled by the battery management system, and a motor that is driven by a power source of the battery module to drive the wheels .

According to the present invention, there is provided a battery management system capable of checking whether the battery management system is malfunctioning by checking the calculation capability of the master or the slave of the battery management system and thereby improving stability during operation of the electric vehicle, Can be provided.

In addition, according to the present invention, a battery management system capable of determining the failure of a battery management system through redundancy of a communication network between internal modules of a battery management system and monitoring traffic, and improving the stability during operation of the electric vehicle by coping with a failure, It is possible to provide an electric vehicle equipped with the electric motor.

1 is a block diagram of a battery management system according to an embodiment of the present invention;
2 is a schematic block diagram of an internal communication network of the battery management system of FIG.
3 is a schematic block diagram of the power supply network of the battery management system of FIG.
4 is a block diagram of a master structure that can be employed in the battery management system of FIG.
5 is a block diagram of a slave usable in the battery management system of FIG.
FIG. 6 is an exemplary diagram for explaining a principle of determining whether or not a failure has occurred in the battery management system of FIG. 1; FIG.
7 is a block diagram of a battery management system according to another embodiment of the present invention
8 is a block diagram of a monitoring apparatus of the battery management system of FIG.
FIG. 9 is an exemplary diagram of signal processing for explaining the principle of determining whether or not a failure has occurred in the battery management system of FIG. 7
10 is a schematic block diagram of an electric vehicle according to another embodiment of the present invention

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as being consistent with the meanings in the context of the relevant art and are not to be construed as ideal or overly formal meanings unless explicitly defined in the present application.

1 is a block diagram of a battery management system according to an embodiment of the present invention.

1, a battery management system 100 according to the present embodiment includes a master 10a, a slave 11, a measurement unit 20, a cell balancing unit 30, and a monitoring device 40 ). The master 10a and the slave 11 may be in charge of at least some of the functions of the control unit 10 of the battery management system 100. The monitoring device 40 may be included in the control unit 10, but not limited thereto, and at least a part of the monitoring device 40 may be installed in the battery management system 100.

To explain each component more specifically, the master 10a can function as the main BMS of the battery management system 100. [ The master 10a may determine the state of the cell or the cell module based on the cell voltage or the cell temperature collected from the slave 11 and may control the operation of the battery module 200 according to the determination result. The operation of the battery module 200 may include an operation mode such as charging, discharging, or disconnection. The master 10a may be implemented as a main BMS board in which a microprocessor or a microprocessor is mounted.

The slave 11 is connected to at least one cell module or a cell assembly included in the battery module 200 to measure voltage, temperature, and the like for a plurality of cells included in the cell module. The slaves 11 may be installed as a plurality of independent slaves corresponding to the plurality of cell modules in the battery module 200. [ In this embodiment, the slave 11 is connected to the master 10a in a dual network structure via a dual internal communication network including a main communication network C1 and a sub communication network C2.

The measurement unit 20 measures the current and voltage of the battery module 200. The measuring unit 20 may include a current sensing circuit and a voltage sensing circuit, and the current sensing circuit and the voltage sensing circuit may be connected to the switching box 210 described later.

The cell balancing unit 30 performs on-off control of a plurality of switches disposed at an output terminal of the battery module 200 based on the cell current and voltage acquired from the slave 11, Adjust the output operation state of the module. The cell balancing unit 30 may include a plurality of relays and a relay control circuit connected to a plurality of switches in the switch box 210. [

The monitoring device 40 determines whether or not at least a part of the battery management system is malfunctioning by confirming the computing power of the master 10a or the slave 11 or by monitoring the traffic between the internal modules of the battery management system And a means for constructing the unit. This monitoring device 40 will be described in detail below.

The battery management system 100 according to the present embodiment can be mounted inside the case of the battery pack 400 together with the battery module 200. [ Of course, the battery management system 100 may be disposed outside the battery pack 400, in which case the battery pack including the battery module 200 and the battery management system 100 may be referred to as a battery system. Here, the battery module 200 includes a plurality of cell modules or cell stacks. The cell module may include a plurality of cells (single cells) and one or more connection terminals for connecting the plurality of cells.

In addition, the BMS 100 according to this embodiment is connected to the output terminal of the battery module 200 and the intermittent output power (P _B) of the battery module 200, output power, voltage or current of (P _B) To the switching box 210, which provides information to the battery management system 100.

Here, the switching box 210 includes a plurality of switches controlled by the cell balancing unit 30, and may have connection points for current or voltage sensing. The switching box 210 may include a fuse connected in series to an output terminal of the battery module 200.

FIG. 2 is a schematic block diagram of an internal communication network of a control unit of the battery management system of FIG. 1;

Referring to FIG. 2, the battery management system according to the present embodiment may include a main communication network C1 and a sub communication network C2 as an internal communication network of the controller 10. The sub-network C2 may be referred to as an additional network.

The battery management system includes a master 10a and a plurality of slaves 11, 12 and 13. The plurality of slaves 11, 12 and 13 may include a first slave S 1, a second slave S 2 and an N-th slave S 2. Here, N is a natural number of 3 or more.

Here, the master 10a and the plurality of slaves 11, 12, and 13 correspond to the test control unit (refer to 10 in FIG. 1), and may be referred to as a main BMS and a plurality of sub BMSs, And can be connected to each other by the vehicle communication network of this embodiment described below.

The main communication network C1 may be connected to one terminal of the master 10a and one of the plurality of slaves 11, 12 and 13 and may be connected in parallel with each other. The sub-network C2 may be connected to the master 10a and the other terminals of the plurality of slaves 11, 12 and 13, respectively, and may be connected in parallel with each other. Here, the other terminals may be the same terminals as the one terminals to which the main communication network is connected, or at least some of them may be different terminals. The main communication network C1 and the sub communication network C2 may include a network for CAN (Controller Area Network) communication installed in the vehicle, but are not limited thereto.

3 is a schematic block diagram of a power supply network of the battery management system of FIG.

3, a battery management system according to the present embodiment includes a power supply line (not shown) starting from a master 10a and connecting a plurality of slaves 11, 12, 13 in a chain- P1, P2, PN). That is, the battery management system includes a first power line P1 for supplying power from the master 10a to the first slave (Slave-1) 11, a second power line P1 for supplying power from the first slave 11 to the second slave A second power supply line P2 for supplying power to the N-th slave 12 and an Nth power supply line PN for supplying power to the N-th slave Slave-N 13 from the N-1 slave can do. Here, N is an arbitrary natural number of 3 or more.

The battery management system further includes a first power shutdown signal line L1 for shutting off the power of the first power line P1 connecting the master 10a and the first slave 11, A second power-off signal line L2 for interrupting the power of the second power line P2 connecting the second slave Slave-2 and the N-1 slave and the N-th slave S- And an N-th power-off signal line (LN) for cutting off the power of the N-th power line (PN).

A switch or a relay for cutting off the power of the first power line P1 may be installed where the first power line P1 and the first power-off signal line L1 meet. Likewise, where the second power supply line P2 and the second power supply interruption signal line L2 meet and where the Nth power supply line PN and the Nth power supply interruption signal line LN meet, A switch or a relay for interrupting the power may be installed, respectively.

According to the above-described configuration, when the M th slave connected to the M-1 slave is supplied with power through the M th power supply line, by not activating or activating the signal of the M th power down signal line, The power supply to the M-th slave and the slave at the subsequent stage can be maintained or shut off. Here, M is a natural number greater than 1 and less than or equal to N.

4 is a block diagram of a master structure that can be employed in the battery management system of FIG.

Referring to FIG. 4, the master 10a of the battery management system according to the present embodiment may include a measurement unit 20, a cell balancing unit 30, a communication unit, and a master control unit 10b. Further, the master 10a may further include an air conditioning unit 50 or an insulation test circuit (not shown).

The measuring unit 20 receives a predetermined signal S1 from the switching box and the cell balancing unit 30 receives a signal S2 for controlling one or more switches in the switching box, 1 < / RTI >

The measuring unit 20 and the cell balancing unit 30 may be integrally mounted on the master 10a of the battery management system. However, the present invention is not limited thereto. Or installed on the main BMS board.

The communication unit is connected to the vehicle communication network and can perform data communication with a plurality of slaves (11, 12, 13). At this time, the communication unit includes a first communication unit 101 for performing data communication with a plurality of slaves (see 11, 12 and 13 in FIG. 2) through the main communication network C1, and a plurality of slaves And a second communication unit 102 for performing data communication.

Here, the first communication unit 101 may include a first communication port and a first communication module, and the second communication unit 102 may include a second communication port and a second communication module. Of course, depending on the implementation, the first communication port and the second communication port are the same communication port, and the first communication module and the second communication module may be the same communication module.

Further, the communication unit may include a third communication unit (not shown) for data communication with the vehicle control device or the host device, but is not limited thereto. The third communication unit may be a first communication unit or a second communication unit according to an implementation.

The communication unit may further include a fourth communication unit 104 connected to a power-off signal line for controlling the power supply network and transmitting a power-off control signal S5 to the power-off signal line. The fourth communication unit 104 may include an output port connected to a specific output terminal of the master control unit 10b.

The master control unit 10b controls the operation of the master 10a and the respective components of the master 10a. The master control unit 10b can control each component according to a program or stored command or signal to operate the master 10a.

The air conditioning unit 50 may include a fan connected to the master 10a to cool the master 10a or a component for controlling a predetermined cooling device or a component performing a function corresponding to such a cooling device. The air conditioning unit 50 may be implemented to perform PWM (Pulse Width Modulation) control for controlling the fan or the cooling apparatus.

The master 10a comprising the above-described components may be implemented as a microprocessor, an integrated circuit (IC), or a main BMS board on which one of these is mounted. The master 10a or the master control unit 10b having such a configuration may further include a memory, an analog-to-digital converter, and the like depending on the implementation.

5 is a block diagram of a slave that can be employed in the battery management system of FIG.

Referring to FIG. 5, the slave 11 of the battery management system according to the present embodiment may include a cell voltage measuring unit 21, a cell temperature measuring unit 22, a communication unit, and a slave control unit 11b. The slaves 11 may be implemented as a plurality of cell stacks forming a battery module, a cell assembly, or a module board installed in a cell string, respectively.

The description of the slave 11 in this embodiment is not limited to the first slave, but may be applied to the other slave in substantially the same manner.

The cell voltage measuring unit 21 includes a unit connected to a specific cell module for measuring a voltage for each of a plurality of cells (cell units) in the cell module, and a unit for performing a function corresponding to such a unit. The specific cell module may be either a specific cell assembly included in the battery module or a plurality of cell modules of the cell string.

The cell temperature measuring unit 22 includes a unit connected to the specific cell module for measuring the temperature of each of the plurality of cells in the cell module, measuring the temperature of the cell module, or performing a function corresponding to the means do.

The communication unit includes a first communication unit 111, a second communication unit 112, and a third communication unit 114. The first communication unit 111, the second communication unit 112, and the third communication unit 114 may be referred to as a slave communication unit, respectively. The first communication unit 111 performs data communication with the master or another slave through the main communication network C1 which is an internal communication network of the battery management system and the second communication unit 112 communicates with the sub communication network C2 ) To perform data communication with the master or another slave. The third communication unit 114 includes a component or means for outputting a predetermined signal S6 to the specific power-off signal line L2 coupled to the specific power supply line. The predetermined signal S6 may include a predetermined level of voltage or current for opening the switch or for controlling the contacts of the relay.

The slave controller 11b controls the operation of the specific slave 11 and the respective components of the slave 11. The slave controller 11b can operate each slave 11 by controlling each component according to a control signal of the master 10a or an instruction or signal of a program stored in advance. The slave control unit 10b may be implemented as a logic circuit using an integrated circuit (IC) or a flip-flop to control the cell voltage measurement module and the cell temperature measurement module.

Meanwhile, in this embodiment, the slave may further include the cell balancing unit mentioned in FIGS. Since the cell balancing unit is substantially the same as the cell balancing unit installed in the master or battery management system, detailed description thereof will be omitted.

FIG. 6 is an exemplary diagram for explaining the principle of determining whether a failure has occurred in the battery management system of FIG. 1. FIG.

The battery management system according to the present exemplary embodiment compares the computation capability of the battery management system with the computed value and computes the time taken to perform the computation for the self diagnosis of the failure, and calculates the round trip time , Hereinafter referred to as RTT) is calculated to derive a reliability score of the battery management system, and it is determined whether the battery management system is malfunctioning based on the reliability score.

That is, in the method of confirming the computing ability of the battery management system, the master 10a of the battery management system generates an equation including an operator and a variable, and transmits it to the specific slave 13 through data communication of the internal communication network (S61 ). Then, the slave control unit of the slave 13 calculates it according to a predetermined procedure (setting) (S62), measures an operation time required for the calculation (S63), and then performs an operation including the result value and the operation time T2 And causing the result R to be responded to the master 10a (S64). The computation time may be in microseconds (μs).

An example of the above-described equation (E) is shown in Equation (1).

An example of the above-described calculation result R is shown in Equation (2).

When the result value of the operation result obtained through the above function is different from the predetermined reference value or out of the reference error range, the score is subtracted. When the subtraction score is increased more than a predetermined score and is lower than the predetermined reliability score, It can be judged as a failure (S65). In addition, the master 10a can determine the failure of the slave 13 by calculating the reliability score, and it can be weighted and deducted as the calculation time in the slave 13 increases.

More specifically, in this embodiment, it is possible to determine whether a slave or a master of the battery management system has a failure by utilizing the result of the RTT (Round Trip Time) calculation. To this end, the master control unit can obtain the RTT at the time of message transmission / reception. RTT can be calculated as a time obtained by subtracting the calculation time T2 of the specific slave 13 from the calculation time T1 of the master 10a.

If the calculated RTT value increases, the score for the slave 13 may be subtracted from the preset reference score, and the message transmission period for the slave 13 may be adjusted to test again. If the calculated RTT value is greater than or equal to a preset specific value, the slave 13 can be judged as a failure immediately.

Further, according to the implementation, the failure of one slave 13 can be determined using the main communication network, the sub communication network, or both. For example, the master control unit may transmit a predetermined calculation formula to a specific slave connected to the main communication network, and may control the slave to use the sub-communication network when the RTT value included in the calculation result in the slave response decreases . Similarly, when the RTT value decreases in a specific slave using a sub-network, the master 10a can control the slave to send and receive messages through the main communication network. On the other hand, if the RTT value does not decrease or continuously increases, the master 10a may determine that the corresponding slave 13 is defective and control the corresponding slave to use the sub communication network instead of the main communication network currently used.

According to the above-described configuration, the slave can be determined as a failure based on the calculation result value of the slave, or the slave BMS corresponding to the slave can be determined as failure.

Meanwhile, in the above-described embodiment, the master 10a determines whether or not a specific slave has failed. However, the present invention is not limited to this. In another embodiment of the present invention, To determine whether a particular slave has failed in the master. In this case, the side that determines whether or not a fault has occurred can be a tester, and the target that is determined to be faulty can be a target.

Further, in the above-described embodiment, the master is a supplier that supplies power to the slave judged as a failure, and transmits a power-off control signal to the corresponding slave or another slave transmitting power to the slave so that the slave is powered off . That is, the master can transmit a power-off signal or a related message to the slave which can interrupt the power of the slave judged as the failure, and cut off the power of the slave having the failure for a predetermined time. Thus, the slave can go through the initialization process again, thereby eliminating the cause of the abnormal operation.

According to this embodiment, the master compares the RTT (Round Trip Time) corresponding to the reception time of the response after transmission of the operation request signal with the preset time as a tester, and the slave whose RTT is equal to or larger than the first specific value A slave having a first specific value smaller than the first specific value can be controlled to use the main communication network. Also, the master may determine that the slave is malfunctioning when the RTT of one or more slaves using the sub-network is greater than or equal to a second specific value greater than the first specific value. In addition, the master transmits a power-off signal to the power-off signal line for shutting off the power line connected to the input terminal of the faulty slave, and the power of the faulty slave is blocked for a predetermined time by the power-off control signal to initialize the faulty slave can do. According to the above-described configuration, the operation reliability of the battery management system can be increased, and the stability during operation of the electric vehicle can be improved.

7 is a block diagram of a battery management system according to another embodiment of the present invention.

Referring to FIG. 7, the battery management system 100 according to the present embodiment includes a master 10a, a plurality of slaves 11, 12, and 13, and a monitoring device 40. FIG. The master 10a and the plurality of slaves 11, 12, and 13 may constitute a control unit of the battery management system 100. [ In this case, the monitoring apparatus 40 may not be included in the control unit, but the present invention is not limited thereto and may be installed in the control unit of the single module. Also, according to the implementation, the control unit may be configured to include the master 10a and the monitoring device 40 with a plurality of slaves 11, 12, and 13 disposed outside.

The battery management system 100 also includes an internal communication network C1 and C3 for connecting the master 10a with a plurality of slaves 11 and 12 and the monitoring device 40, An additional communication network C5 for connecting the plurality of slaves 11, 12 and 13 to the monitoring device 40 and an additional communication network C5 for connecting the master 10a and the upper module And an external communication network C7 for connecting the external communication network C6 and the monitoring apparatus 40 to each other.

The battery management system 100 may be inserted into the battery pack, but not limited thereto, and may be installed outside the battery pack. In that case, the battery pack and the battery management system 100 may be referred to as a battery system.

8 is a block diagram of a monitoring apparatus of the battery management system of FIG.

Referring to FIG. 8, the monitoring apparatus 40 according to the present embodiment includes a communication function monitoring unit 41 and a congestion monitoring unit 42. In addition, the monitoring apparatus 40 may further include a recovery signal generating unit 43 according to an implementation.

The monitoring device 40 is connected to a battery management system and can perform data communication with a battery data recorder (BDR) for recording battery data, and can communicate with a master or a plurality of slaves of the battery management system (BMS) Data communication can be performed.

The communication function monitoring unit 41 is a means for confirming the communication functions of the components of the battery management system, particularly, the master 10a or the plurality of slaves 11, 12 and 13, . The communication function monitoring unit 41 includes a message generating unit for generating a predetermined message, a message transmitting unit for transmitting the generated message to a predetermined object, a response receiving unit for receiving a response from the destination to which the message is transmitted, And a comparison unit (or a first comparison unit) for comparing the message and the received message to determine whether they are the same or not.

The congestion monitoring unit 42 performs a function corresponding to the means for monitoring the congestion only for communication with the components of the battery management system, particularly, the master 10a or the plurality of slaves 11, 12, . The congestion monitoring unit 42 includes a time stamp generator for generating a time stamp (first time stamp), a time stamp supplier for providing a time stamp to the message generator of the communication function monitor 41, (Or a second comparison unit) that compares the time stamp (second time stamp) received from the response reception unit of the second time stamp 41 with the first time stamp.

The second comparing unit may be configured to determine whether an elapsed time from a second time of the second time stamp minus a first time of the first time stamp is less than a preset reference time. As a result of the comparison by the second comparing unit, if the value of the second time stamp increases, it is determined that the congestion degree of the communication network for the corresponding component is increased, and the predetermined operation can be performed according to the increased congestion degree. The preset operation may include operations such as recording of congestion, signal output for initializing the target component, and the like.

The recovery signal generating unit 43 generates a plurality of signals (Reset Signal) for initializing one or more slaves or masters determined to be abnormal communication functions or increased in congestion. The plural signal generating unit 43 can directly generate a plurality of signals. However, the present invention is not limited to this, and in the case of a failure of the slave, it may be implemented to operate in such a manner that the master requests generation and transmission of a plurality of signals to be used in the slave have.

9 is a diagram illustrating an example of a signal flow for explaining a failure determination principle of the battery management system of FIG.

The failure determination process of the battery management system according to the present embodiment determines a failure of the master of the battery management system. It is a matter of course that this method of determining whether or not a fault has occurred can be used to determine whether or not a specific slave is faulty in addition to the master.

Referring to FIG. 9, a method of determining whether a failure of the master of the battery management system according to the present embodiment is a failure will be described.

First, the monitoring apparatus 40 transmits a preset message to the master 10a through the internal communication network C3 (S91). The preset message may be a request message that includes a content "additional network " requesting a response to an additional network. In this case, in the steady state, the master 10a transmits a response message including specific information, for example, an "additional communication network " to the monitoring device 40 via the additional communication network C4. However, if the master 10a fails or is in an abnormal state, the master 10a may not return a response message or return a response message via the internal communication network C3, or may transmit the specific information via the additional communication network C4 A response message including any information other than the response information can be returned. According to the above-described configuration, the monitoring apparatus 40 can check the state of the master 10a (normal, abnormal, failure, etc.) by checking the response message, Can be initialized.

Further, the monitoring apparatus 40 can transmit a preset message to the master 10a via the external communication network C7 (S93). The preset message may be a request message that includes a content "additional network " requesting a response to an additional network. In this case, in the steady state, the master 10a transmits a response message including specific information, for example, an "additional communication network " to the monitoring device 40 via the additional communication network C4. However, if the master 10a fails or is in an abnormal state, the master 10a may not return a response message or return a response message via the external communication network C7, or may transmit the specific information via the additional communication network C4 A response message including any information other than the response information can be returned. According to the above-described configuration, the monitoring apparatus 40 can check the state of the master 10a (normal, abnormal, failure, etc.) by checking the response message, Can be initialized.

In the above-described communication abnormality monitoring procedure, the monitoring device 40 may use one or more of the internal communication network, the additional communication network, and the external communication network to transmit a request for a response to the electronic devices of the battery management system It is possible to perform monitoring and restoration of failure.

In addition, by adding a time stamp to the message, it is possible to judge the degree of congestion or load of the communication network of each electronic device (including the master or the slave) as well as to monitor the communication function of the electronic devices in the battery management system, The state of the electronic device can be judged. Particularly, it is possible to more effectively and precisely determine the failure of the electronic device by performing the determination of the degree of congestion or load and the detection of communication abnormality in combination.

In addition, the monitoring device 40 according to the present embodiment can monitor all the messages going to the internal communication network, the additional communication network, or the external communication network together with the above-mentioned messages according to the implementation. At this time, when the monitoring device 40 receives a value that is out of the allowable value for each message, it can increase the message error count of the master or slave that sent the message. If the message error count increases beyond the first specific value, the master or slave can be notified of a message error. If the message error count increases by a second specific value or more, the master or slave can be judged as a failure and propagated to the master or slave. Here, the second specific value is larger than the first specific value.

In this embodiment, any one of the plurality of slaves or the master is a target to be judged as a failure, and the monitoring apparatus 40 may be a tester for judging whether or not a target is faulty.

According to the present embodiment, the battery management system monitors the abnormality of the communication function of the master or the slave by using the monitoring device, calculates the congestion degree of the communication network, monitors the error of the message, Thereby improving the operational stability of the electric vehicle on which the battery management system is mounted.

10 is a schematic block diagram of an electric vehicle according to another embodiment of the present invention.

10, an electric vehicle 300 according to the present embodiment includes a battery management system 100, a battery module 200, an electronic control unit 310, and a CAN (Controller Area Network) communication network 320 do. Also, the electric vehicle 300 may include an inverter, a motor, a transmission (T / M), an electric power steering (EPS), and the like. Here, the inverter converts the power of the battery module 200, the motor is driven by the inverter's converted power, the T / M is driven by the motor to rotate the wheels, and the EPS controls the direction of the wheels during operation It plays a role by smoothly moving the handle.

The battery management system 100 may be any one of the battery management systems described above with reference to FIGS.

The battery module 200 includes a plurality of cell stacks or cell assemblies. The cell assembly may include a connection terminal connected to one or more of the plurality of cells. The battery module 200 may have a predetermined tack output voltage and capacity characteristics by connecting a plurality of cell assemblies in series or in parallel.

At least one electric control unit (ECU) 310 may be installed in the electric vehicle 300. The electronic control unit 310 controls the corresponding components of the electric vehicle 300 according to the signal M1 from the accelerator pedal system, the signal M2 from the brake system and the signal M3 from the system used in the other vehicle Can be controlled.

In this embodiment, the electronic control device 310 refers to a device that performs data communication with the battery management system 100. [ The electronic control device 310 may function as a battery data recording device for storing data on the battery module 200 or a cell assembly of the battery module, or may be a part of the battery data recording device to manage a storage device such as a memory have.

The electronic control unit 310 monitors whether the master and the slaves of the battery management system 100 are faulty or not and interlocks with the monitoring device of the battery management system 100 to operate the master or the slave can do.

The CAN communication network 320 has two buses, and refers to a network in which data is stored on a communication line and necessary data is used and used. The CAN communication network 320 is characterized in that the two buses are in a twisted pair type and perform differential communication, so that they are very resistant to electrical noise. However, if data is read due to the voltage difference between the two buses, if one of the two is disconnected, communication can not be performed and appropriate protection measures can be taken.

According to this embodiment, it is possible not only to provide a battery management system capable of performing a self diagnosis and a plurality of states such as failure or the like, but also it is possible to supply stable electric power to the electric vehicle through such a battery management system. It is possible to prevent the stoppage of operation due to power abnormality and improve the reliability of the electric vehicle operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood that various combinations and permutations and applications not illustrated in the embodiments are possible. Therefore, it should be understood that the technical contents related to the modification and application that can be easily derived from the embodiments of the present invention are included in the present invention.

10:
10a: master
11, 12, 13: Slave
20:
30: cell balancing unit
40: Monitoring device
100: Battery management system
200: Battery module
210: Switching box
400: Battery pack

Claims (10)

A plurality of slaves each measuring a cell voltage or a cell temperature for a plurality of cells of the battery module;
A master for measuring a pack voltage or a pack current of the battery module and controlling an output power of the battery module according to the cell voltage, the cell temperature, the pack voltage, the pack current, or a combination thereof;
A main communication network connecting the master and the plurality of slaves;
A sub-communication network for connecting the master and the plurality of slaves; And
A plurality of pairs of power supply lines and a power supply cut-off signal line for connecting the plurality of slaves from the master in a predetermined order in a chain form,
Wherein one tester selected from among the plurality of slaves and the master generates an operation expression for confirming the operation capability of the other target and transmits an operation request signal including the operation expression to the target, And receives a response including the result of the calculation formula and the calculation time from the target, and determines the normal, abnormal or failure state of the target based on the resultant value and the calculation time. The method according to claim 1,
When the tester is the master, the tester compares the RTT (Round Trip Time) corresponding to the reception time of the response after transmission of the operation request signal with a predetermined time, and the slave having the RTT of the first specific value or more And controls the slave having the RTT smaller than the first specific value to use the main communication network. The method of claim 2,
Wherein the tester determines that the slave is broken when the RTT of one or more slaves using the sub-network is greater than or equal to a second specific value greater than the first specific value. delete The method according to claim 1,
The tester transmits a power-off signal to a power-off signal line for interrupting a power line connected to an input terminal of the faulty slave, and interrupts the power of the faulty slave for a predetermined time by the power- The battery management system comprising: A plurality of slaves each measuring a cell voltage or a cell temperature for a plurality of cells of the battery module;
A master for measuring a pack voltage or a pack current of the battery module and controlling an output power of the battery module according to the cell voltage, the cell temperature, the pack voltage, the pack current, or a combination thereof;
A monitoring device for checking the communication capability and communication data of the master and the plurality of slaves to determine whether the master or the plurality of slaves are faulty;
An internal communication network connecting the master, the plurality of slaves, and the monitoring apparatus;
A plurality of additional communication networks connecting the master and the monitoring device and connecting the plurality of slaves and the monitoring device; And
An external communication network for connecting the master, the monitoring device, and the external module;
/ RTI >
The monitoring apparatus transmits a test message including command information set in advance to at least one of the plurality of slaves and one or more targets selected from the master, receives a response message from the target, And a communication function monitoring unit for determining whether the response message is included in the response message or received the response message through the communication network according to the command information and determining that the one or more targets are defective according to the determination result,
And a recovery signal generator for providing a recovery signal to a target in a failed state in accordance with the monitoring result of the communication function monitoring unit and for interrupting the power of the target in the failed state for a preset time. delete The method of claim 6,
And a mixing degree monitoring unit for providing a time stamp to the monitoring device,
Wherein the mixing degree monitoring unit further determines the status of the one or more targets based on a first time stamp included in the test message and a second time stamp generated by the response message. The method of claim 8,
Wherein the recovery signal generating unit provides a recovery signal to a target in a failed state according to the monitoring result of the mixing degree monitoring unit to shut off the power of the target in the failed state for a preset time. The battery management system according to any one of claims 1 to 3, 5, 6, 8, and 9.
A battery module controlled by the battery management system; And
A motor driven by a power source of the battery module to drive a wheel;
.

Images