KR20140072522A - System and method for managing battery and vehicle equipped with the same system - Google Patents

Abstract

Disclosed are a system and a method for managing a battery, and a vehicle having a system for managing a battery. The system for managing a battery comprises a main relay which is arranged at a connection circuit between a battery and an electric part; a precharge relay which is connected on both ends of the main relay in parallel and has protective resistance; a capacitor of the electric part which is connected to the connection circuit; and a control unit for checking a current change amount of the connection circuit and a voltage change amount of the capacitor after the precharge relay is turned on, and detecting a physical error of the connection circuit.

Description

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

The present invention relates to a battery management system, a battery management method, and a vehicle equipped with a battery management system that can prevent burn-out of a protection resistor of a precharge relay.

For vehicles that use hybrid vehicles, electric vehicles and other batteries as driving energy, use high-capacity high-voltage batteries. In addition, such systems are used throughout the industry as a driving source of electricity.

In order to securely use such a high-voltage battery, a high-voltage power source is connected to the vehicle by turning on a main relay to supply a drive power source, that is, a main battery power of a high voltage, to the vehicle system when the vehicle is started.

However, when the main relay is attached directly to the vehicle system, a sudden current flow occurs when the main relay is attached, that is, the battery is temporarily short-circuited and a main relay sticking phenomenon occurs due to the flow of inrush current. That is, it can cause serious damage to electronic equipment such as an inverter capacitor.

In order to prevent such sticking phenomenon and damage of the vehicle side system, precharge relay is used to delay the rise of the power supply voltage to prevent a sudden current flow to prevent relay sticking and damage to the vehicle side system.

This technique is disclosed in a prior art KR 10-2009-0039891 A, "Precharging control method for hybrid vehicle", a method for controlling a precharging control method for a hybrid vehicle, comprising the steps of: recognizing a start signal (ignition on) The method comprising: determining whether a difference between the inverter DC link voltage and a main battery voltage is within a predetermined voltage, and when the voltage difference is within a predetermined voltage range And terminating the precharging and turning on the main relay when it is judged that the precharging is in progress.

However, the initial driver turns on / off each relay according to the relay sequence when the vehicle starts, and the voltage in the capacitor inside the high voltage parts (inverter, LDC, FATC) rises. The gradual rise of the capacitor voltage is due to the high capacitance resistance connected by the precharge relay. By this resistance, the current value changes depending on the difference between the battery voltage and the capacitor voltage.

This high capacity resistance plays an important role in initial vehicle start-up. However, methods and methods to prevent the high-capacity resistor from being burned out in the event of an abnormality of the high-voltage system are not currently applied.

When the driver starts the vehicle in a state where the high voltage line is shorted due to the high voltage system and the battery system, the capacitor voltage does not rise but the overcurrent flows to the high capacity resistor. If this state is repeated, the high-capacity resistance is eventually burned out. As a result, the vehicle system tries to start up in a problematic state, causing parts to be replaced.

On the other hand, in the related art, when the driver starts the vehicle, the battery control unit determines the starting condition and drives the precharge relay. After the precharge relay is turned on for a predetermined period of time, the difference between the DC link voltage of the inverter and the battery pack voltage is determined, and the main relay ON is performed to supply the battery energy to the electrical components required for driving the vehicle.

However, in the conventional technology, only the voltage value at the time of pre-charging is merely judged. However, if the system is in an abnormal state, if the driver continuously attempts to start, the protection resistance of the precharge can not be protected. That is, the inverter DC link voltage and the battery voltage are judged, and if the condition is not satisfied, the precharging operation time is judged and only the precharging failure failure is expressed.

The prior art can not judge the abnormality of the high voltage system at present, and therefore, there is no logic to protect the pre-charging protection resistor when the high voltage line is short-circuited or the reverse connection is made. There was a problem that parts that would not be exchanged would be created.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2009-0039891 A

It is an object of the present invention to provide a battery management system, a battery management method, and a vehicle equipped with a battery management system that can prevent burn-out of a protection resistor of a precharge relay.

According to an aspect of the present invention, there is provided a vehicle equipped with a battery management system, a battery management method, and a battery management system, including: a main relay provided in a connection circuit between a battery and an electric component; A precharge relay connected in parallel to both ends of the main relay and having a protection resistor; A capacitor of an electrical component connected to the connection circuit; And a controller for checking a current change amount of the connection circuit and a voltage change amount of the capacitor after the precharge relay ON, and detecting a physical error of the connection circuit.

If the current value of the connection circuit or the voltage value of the capacitor does not change after the precharge is turned on, the controller may determine that the connection circuit is a physical error.

After the precharge is turned on, the control unit checks the current change amount of the connection circuit and the voltage change amount of the capacitor to detect a physical error of the connection circuit, checks the difference between the battery voltage value and the capacitor voltage value, Can be detected.

Meanwhile, a method of managing a battery management system includes a precharge step of turning on a precharge relay; A circuit check step of checking a current change amount of the connection circuit and a voltage change amount of the capacitor; And determining a physical error of the connection circuit when the current value of the connection circuit or the voltage value of the capacitor does not change.

The circuit determining step may include: a charging check step of checking a difference between a battery voltage value and a capacitor voltage value; And a charging determination step of determining that the precharging fails if the difference between the battery voltage value and the capacitor voltage value is equal to or greater than a predetermined value.

The charging determination step may determine that the precharging failure is caused when the difference between the battery voltage value and the capacitor voltage value is equal to or greater than a predetermined amount of time.

In the circuit determining step, an error signal is stored in case of a physical error of the connection circuit, so that the pre-charge relay and the main relay are not turned on.

In addition, a vehicle equipped with such a battery management system includes a main relay provided in a connection circuit between a battery and an electric component, a pre-charge relay connected in parallel at both ends of the main relay and having a protection resistor, And a control unit for detecting a physical error of the connection circuit by checking a current change amount of the connection circuit and a voltage change amount of the capacitor after pre-charge relay ON-ON.

According to the vehicle equipped with the battery management system, the battery management method, and the battery management system having the above-described structure, it is possible to protect the resistance when an abnormality occurs in the vehicle or the like by having the logic for protecting the high- It can prevent unnecessary maintenance and costs.

In addition, it is possible to quickly cope with a failure of a corresponding part of the vehicle by sensing a reverse connection or a short-circuit situation of a high-voltage line.

1 is a configuration diagram of a battery management system according to an embodiment of the present invention;
2 is a flowchart of a battery management method according to an embodiment of the present invention;
Figures 3-4 illustrate exemplary data graphs in accordance with the battery management system of the present invention.

Hereinafter, a vehicle having a battery management system, a battery management method, and a battery management system according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a battery management system according to an embodiment of the present invention. The battery management system of the present invention includes a main relay 200 provided in a connection circuit L between a battery 100 and an electric component 400; A precharge relay 300 connected in parallel to both ends of the main relay 200 and having a protection resistor 320; A capacitor 500 of the electrical component 400 connected to the connection circuit L; And a control unit 600 for checking a current change amount of the connection circuit L and a voltage change amount of the capacitor 500 after the precharge relay 300 is turned on to detect a physical error of the connection circuit L .

A battery 100 of a vehicle or the like is a high voltage battery, and a plurality of battery cells are connected in series. In this case, a plurality of electric components 400 are connected in parallel to receive a current, and a main relay 200 is provided for opening or closing the connection circuit. In addition, the main relay is divided into + and - to ensure stability.

On the other hand, the pre-charge relay 300 is provided in parallel in the main relay 200 of the connection circuit L and the high-capacity protection resistor 320 is provided in the pre-charge relay 300.

First, before connecting the battery 100 of the vehicle to the electric component 400, the main relay 220 is first turned on. Then, the precharge relay 300 is turned on so that current flows through the precharge relay 300, not the main relay 200, and flows through the protection resistor 320.

At this time, current also flows in the capacitor 500 provided on the electric component 400 side to charge the capacitor 500. The electric component includes an inverter 420, an LDC 440, a FATC 460, and the like, and each capacitor 500 may be provided. The voltage of the battery 100 is divided by the protection resistor 320 and the capacitor 500 so that an excessive large current is prevented from being applied to the electrical component 400 rapidly and an excessive current flows to the main relay 200, Thereby preventing the relay 200 from being short-circuited.

Meanwhile, in this situation, a current flowing through the connection circuit L is measured, and at the same time, a voltage at both ends of the battery 100 is compared with a voltage applied to the capacitor 500. In this case, The normal operation is started by turning on the + of the relay 200 and then turning off the precharge relay 300.

Here, the control of the relay and the measurement values of the current and the voltage are performed through the control unit 600, and as a specific example, such a control unit can be handled by the battery system control unit (BMS).

On the other hand, the control unit 600 turns on the precharge relay 300 first. Thereafter, the current change amount of the connection circuit (L) and the voltage change amount of the capacitor (500) are checked. And to detect physical errors of the connection circuit L through comparison of the check values.

Specifically, if the current value of the connection circuit L or the voltage value of the capacitor 500 does not change after the precharge relay 300 is turned on, the controller 600 determines that the connection circuit L is a physical error of the connection circuit L .

That is, as shown in FIG. 3, when the precharge relay is normally on (10), the voltage (20) is applied to the capacitor and the current (30) is increased and then decreased as the capacitor is charged It is a common tendency to have a tendency. After the state is stabilized, the + of the main relay is connected (40) and the precharge relay is turned off (10).

However, as shown in Fig. 4, if the "S" point is shorted in the connection circuit of Fig. 1, or if the part of the other connection circuit L is shorted or reversed, the precharge relay or the capacitor plays a normal role The voltage value 20 of the capacitor remains at the initial value even when the precharge relay is turned on 10, and the amount of change becomes zero. In this case, the battery current 30 maintains a high value, The protection resistor 320 of the transistor Q3 may be damaged.

Therefore, in this case, the normal voltage value is not measured in the capacitor 500, and the system determines that the pre-charging failure is caused, so that the user continuously tries to start up, The unnecessary problem that the protection resistor 320 is eventually destroyed is expanded.

Therefore, in the present invention, it is possible to detect in advance a physical error of the connection circuit in advance so as not to lead to burn-out of the protection resistor.

If the voltage value of the capacitor 500 does not change or the change of the current value of the connection circuit L is not detected during the pre-charging, the control unit determines that the connection circuit L is a serious short circuit or a reverse connection The protection resistor 320 is prevented from being burned out by limiting the attempt to start the abnormal operation and sending a warning message.

After the precharge relay 300 is turned ON, the control unit 600 detects a physical error of the connection circuit L by checking the current change amount of the connection circuit L and the voltage change amount of the capacitor 500, The difference between the voltage value of the battery 100 and the voltage value of the capacitor 500 is checked to detect the precharge failure.

That is, after the controller determines that there is no abnormality in the connection circuit, the control unit determines whether the difference between the voltage value of the battery 100 and the voltage value of the capacitor 500 is equal to or greater than a predetermined value (for example, 5 V) It is possible to shorten the precharging time by detecting the failure of the precharging.

Meanwhile, FIG. 2 is a flowchart of a battery management method according to an embodiment of the present invention. The battery management method of the present invention includes: a precharge step S300 of turning on a precharge relay; A circuit check step (S400) of checking a current change amount of the connection circuit and a voltage change amount of the capacitor; And a circuit judging step (S420) of judging that the current value of the connecting circuit or the voltage value of the capacitor does not change if it is a physical error of the connecting circuit.

In addition, the circuit determining step (S420) may include a charging check step (S500) of checking a difference between the battery voltage value and the capacitor voltage value; And a charging determination step (S520) of determining a pre-charging failure when the difference between the battery voltage value and the capacitor voltage value is equal to or greater than a predetermined size.

If the difference between the battery voltage value and the capacitor voltage value is equal to or greater than a predetermined value after a predetermined time passes, the charging determination step S520 determines that the pre-charging failure is present. The circuit determination step S420 may include: The pre-charge relay and the main relay are not turned on later by storing the error signal.

Specifically, first, an abnormality message of the connection line at startup is checked (S100). If there is no abnormality, the start operation is started.

The start-up operation is performed by connecting the minus relay of the main relay (S200) and connecting the precharge relay (S300). Then, the change of the capacitor voltage value and the change of the connection circuit current value are measured, and it is checked whether both values are changed to check whether the connection circuit is physically normal or not (S400).

If it is determined as a physical error, an error message on the connection line is generated to warn the user in advance and protect the protection resistor by preventing the start operation itself from starting (S420).

If there is no abnormality, precharge is terminated when the difference between the battery voltage and the capacitor voltage is within a certain size for a predetermined period of time. In this case, the + of the main relay is connected and the precharge relay is turned off (S500). If the difference between the battery voltage and the capacitor voltage is not within a predetermined size for a predetermined time, a precharge failure is determined and a message is generated at step S520. After that, the main relay is turned on and the precharge relay is turned off to operate normally (S600, S700).

According to the vehicle equipped with the battery management system, the battery management method, and the battery management system having the above-described structure, it is possible to protect the resistance when an abnormality occurs in the vehicle or the like by having the logic for protecting the high- It can prevent unnecessary maintenance and costs.

In addition, it is possible to quickly cope with a failure of a corresponding part of the vehicle by sensing a reverse connection or a short-circuit situation of a high-voltage line.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100: Battery 200: Main relay
300: Precharge relay 320: Protection resistor
400: Electrical component 500: Capacitor
600:

Claims (8)

A main relay 200 provided in a connection circuit L between the battery 100 and the electric component 400;
A precharge relay 300 connected in parallel to both ends of the main relay 200 and having a protection resistor 320;
A capacitor 500 of the electrical component 400 connected to the connection circuit L; And
And a controller 600 for checking a current change amount of the connection circuit L and a voltage change amount of the capacitor 500 after the precharge relay 300 is turned on to detect a physical error of the connection circuit L. Management system. The method according to claim 1,
The control unit 600 determines that the current value of the connection circuit L or the voltage value of the capacitor 500 does not change after the precharge relay 300 is turned on, A battery management system. The method according to claim 1,
The control unit 600 detects a physical error of the connection circuit L by checking the current change amount of the connection circuit L and the voltage change amount of the capacitor 500 after the precharge relay 300 is turned ON, (100) and the voltage value of the capacitor (500) to detect a precharge failure. A method for managing a battery management system according to claim 1,
A pre-charge step S300 for turning on the pre-charge relay;
A circuit check step (S400) of checking a current change amount of the connection circuit and a voltage change amount of the capacitor; And
And determining (S420) that the current value of the connection circuit or the voltage value of the capacitor does not change if it is determined that the connection circuit is a physical error. The method of claim 4,
The circuit determination step (S420) includes a charging check step (S500) of checking a difference between the battery voltage value and the capacitor voltage value; And determining a pre-charge failure when the difference between the battery voltage value and the capacitor voltage value is equal to or greater than a predetermined value (S520). The method of claim 5,
Wherein the charging determination step (S520) determines that the pre-charging fails if the difference between the battery voltage value and the capacitor voltage value is greater than a predetermined value after a predetermined time passes. The method of claim 4,
Wherein the circuit determining step (S420) stores an error signal in the event of a physical error of the connection circuit, thereby preventing the next pre-charge relay and the main relay from being turned on. A main relay 200 provided in a connection circuit L between the battery 100 and the electrical component 400 and a precharge relay 300 connected in parallel at both ends of the main relay 200 and having a protection resistor 320, ), The capacitor 500 of the electrical component 400 connected to the connection circuit L and the voltage change amount of the capacitor 500 after the precharge relay 300 is turned on after checking the current change amount of the connection circuit L and the voltage change amount of the capacitor 500 And a controller (600) for detecting a physical error of the connection circuit (L).

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