KR20190037882A - Battery management system and overcharge protection method thereof - Google Patents

Abstract

The present invention provides a battery management system which performs diagnosis of a wire harness and an overcharge protection method thereof. According to the present invention, the battery management system comprises: slave controllers monitoring both voltages of each of at least two battery cells from the battery cells to be connected in series and generating a fault signal when the both voltages are greater than a reference voltage; and a master controller connected to the slave controllers through the wire harness, supplying relay drive voltage to the battery cells, responding the received fault signal from the slave controllers to block the relay drive voltage which is supplied to the battery cells, wherein the master controller can diagnose a connection state of the wire harness.

Description

Description BATTERY MANAGEMENT SYSTEM AND OVERCHARGE PROTECTION METHOD THEREOF FIELD OF THE INVENTION [0001]

The present invention relates to a battery management system and its overcharge prevention method.

Unlike conventional internal combustion engine cars, electric vehicles consist of batteries, inverters and converters, electric motors, and battery management systems (BMS). The battery uses a rechargeable secondary battery, which has the greatest effect on the performance and price of the electric vehicle. The electric motor generates driving force through the battery, and the inverter and the converter change the direct current and the alternating current. The battery used in electric vehicles stores electric energy and can be used as a power source of the vehicle through discharging process when necessary, and plays a role of regenerating and storing energy discharged from braking into electric energy. Various energy flows according to the driving of the electric vehicle can be effectively used. In an electric vehicle, the BMS controls the cooling performance of the battery and manages and controls the information of the battery charge state (SOC), maximum charge and discharge power, various warnings and defects required for driving the vehicle in real time, The main purpose is to create. In addition, the battery charge and discharge operation during overcharge and overdischarge can damage the battery in advance to prevent situations in advance to extend the life of the battery (State of Health) is also responsible for the various information collected from the battery To provide battery information. The initial operating condition of the BMS is that it is difficult to expect the battery protection and efficient operation by the experiential operation by the voltage and the current of the battery simply. However, in order to solve this problem, the recently introduced BMS, And monitoring the entire voltage and current to provide efficient algorithms to manage the battery to protect the battery and extend the life span.

Published Patent: 10-2016-0111241, Published on: September 26, 2016 Title: Battery status check system for electric vehicles. Japanese Registered Patent: JP 5299397, Registered on June 28, 2013 Title: Battery condition monitoring device.

It is an object of the present invention to provide a battery management system that performs diagnosis of wire harness and a method of preventing overcharge thereof.

It is also an object of the present invention to provide a battery management system for detecting the wiring state of a wire harness and a method of preventing overcharging thereof.

The overcharge prevention method of a battery management system according to an embodiment of the present invention includes: supplying a relay driving voltage to battery cells connected in series; The slave controllers and the master controller connected in series are connected by a wire harness and diagnosing the condition of the wire harness; Determining at least one overcharge state of the battery cells in response to a failure signal transmitted from the slave controllers when the wire harness is not abnormal as a result of the diagnosis; Activating a latch when the cell of the at least one battery is in the overcharged state; And disconnecting the relay driving voltage from the battery cells according to the value stored in the activated latch.

In an embodiment, each of the slave controllers monitors at least two voltages across the battery cells and may generate the fault signal when the voltage across the terminals is greater than a predetermined voltage.

In an embodiment, the step of diagnosing the condition of the wire harness may include discriminating whether the wire harness is disconnected or short-circuited by comparing a voltage distribution of a plurality of resistors connected through the wire harness.

In an embodiment, it may further comprise determining whether a fault signal received from the serially connected slave controllers is maintained for a predetermined time.

In an embodiment, the step of diagnosing the condition of the wire harness may be entered when the cell of the at least one battery is not in the overcharge state.

In an embodiment, it may further comprise determining whether the start signal has changed from off to on.

In an embodiment, if the start signal is changed from off to on, the step of diagnosing the condition of the wire harness may be entered.

≪ Desc / Clms Page number 14 > < Desc / Clms Page number 13 > And supplying the relay driving voltage to the battery cells according to the value stored in the released latch.

In an embodiment, if the start signal is not changed from off to on, maintaining the value stored in the latch; And disconnecting the relay driving voltage from the battery cells according to a value stored in the latch.

The battery management system according to an embodiment of the present invention monitors slave voltage of each of at least two battery cells among serially connected battery cells and generates a failure signal when the both sided voltage is higher than a reference voltage; And a master controller connected to the slave controllers via a wire harness for supplying a relay driving voltage to the battery cells and for interrupting a relay driving voltage supplied to the battery cells in response to a failure signal received from the slave controllers, And the master controller can diagnose the wiring state of the wire harness.

In an embodiment, at least one of the slave controllers comprises: a battery cell; A first distribution resistor having one end connected to the positive voltage terminal of the battery cell; A second distribution resistor having one end connected to the other end of the 1 distribution resistor and the other end connected to the negative voltage terminal of the battery cell; A voltage detector for comparing the voltage at one end of the 2 distribution resistor with the reference voltage; A transistor having a gate connected to an output terminal of the voltage detector and a drain connected to a slave ground terminal; And a relay connected between the positive voltage terminal and the source terminal of the transistor, for generating the fault signal.

In an embodiment, the relay may comprise a photo relay.

In an embodiment, each of the slave controllers may include at least two relays connected in parallel to transmit the fault signal externally.

In one embodiment, one end of each of at least two of the slave controllers is connected to a first detection end of the master controller, and the other end of each of the at least two relays of the one slave controller One end of each of the at least two relays of the other one of the slave controllers is connected to a first return end of the master controller and the other end of the other one of the slave controllers is connected to a second end of the master controller, One end of each of the at least two relays may be coupled to a second return end of the master controller.

In an embodiment, the master controller includes: a first resistor connected between the power supply terminal and the first detection terminal; A second resistor coupled between the first return stage and the second return stage; And a third resistor connected between the second detection terminal and the ground terminal.

The microcomputer may further include a microcomputer for diagnosing a wire connection state of the wire harness using the voltage of the first detection end and the voltage of the second detection end.

In one embodiment, a first comparator compares the voltage of the first sensing stage with a first reference voltage; A second comparator for comparing a voltage of the first detection terminal with a second reference voltage; And a logic circuit for ANDing the output of the first comparator and the output of the second comparator, wherein the first reference voltage may be greater than the second reference voltage.

According to another aspect of the present invention, there is provided a battery management system including first slave controllers connected in a daisy chain manner and monitoring at least one battery cell among first battery cells connected in series; Second slave controllers connected in a daisy chain manner and monitoring at least one battery cell among the second serially connected battery cells; And a controller coupled to the first and second slave controllers via a wire harness for supplying a relay drive voltage to the first and second battery cells and responsive to a failure signal received from the first and second slave controllers And a master controller for interrupting a relay driving voltage supplied to the first and second battery cells, wherein the master controller can diagnose the wiring state of the wire harness.

In an embodiment, the master controller may determine whether the voltage corresponding to the fault signal is a normal overvoltage.

In an embodiment, the master controller includes: a first resistor connected between a power supply terminal and a first detection terminal; A second resistor coupled between the first return stage and the second return stage; A third resistor connected between the second detection terminal and the ground terminal; A delay circuit for outputting a signal corresponding to the failure signal when the voltage of the first detection stage is maintained for a predetermined time; A latch and reset circuit for latching an output value of the delay circuit or resetting the latched value in response to a start signal; And a power supply circuit for disconnecting the relay driving voltage from the first and second battery cells according to an output value of the latch and reset circuit.

The microcomputer further includes a microcomputer for determining the wiring state of the wire harness using the output value of the delay circuit, the output value of the latch and the reset circuit, the voltage of the first detection stage, and the voltage of the second detection stage can do.

The battery management system according to the embodiment of the present invention can be implemented to cut off the voltage supply circuit only in a normal overvoltage condition by performing the diagnosis of the wire harness.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. However, the technical features of the present embodiment are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
FIG. 1 illustrates an exemplary battery management system according to an embodiment of the present invention. Referring to FIG.
FIG. 2 illustrates an exemplary slave controller according to an embodiment of the present invention. Referring to FIG.
3 and 4 are flowcharts illustrating an overcharge protection operation of the battery management system according to an exemplary embodiment of the present invention.
5 is a view illustrating an exemplary battery management system according to another embodiment of the present invention.
FIG. 6 is a view illustrating an exemplary normal overvoltage discrimination circuit shown in FIG. 5. FIG.
FIG. 7 is an exemplary view showing a battery management system of a distributed structure according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms may be used 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. 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.

Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well. 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 this application, the terms "comprises" or "having" are intended to specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, wherein one or more other features, , Steps, operations, components, parts, or combinations thereof, as a matter of course. Unless otherwise defined, all terms used herein, including technical or scientific terms, 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 should be construed as meaning consistent with meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined in the present application .

1 is a diagram illustrating an exemplary battery management system 10 according to an embodiment of the present invention. Referring to FIG. 1, the battery management system 10 may include a plurality of slave controllers 110, 120, ..., 1N0, N being a natural number of 2 or more, and a master controller 200. [

Each of the plurality of slave controllers 110, 120, ..., 1N0 measures the voltage of each of the plurality of battery cells, determines whether the measured voltage is an overvoltage, and outputs a failure signal corresponding to the determined result to the neighbors Master controller 200, or to transmit a fault signal delivered from a neighboring controller to another neighboring controller / master controller 200. The controller / In the embodiment, each of the slave controllers 110, 120, ..., 1N0 may be implemented as an integrated circuit.

In the embodiment, each of the slave controllers 110, 120, ..., 1N0 includes a plurality of relays 111, 112/121, 122 / 1N1, 1N2 for transmitting a fault signal to the outside or receiving the fault signal from the outside . In Fig. 1, two relays are shown in one slave controller for convenience of explanation. However, it should be understood that the number of relays for each slave controller of the present invention is not limited thereto.

In an embodiment, each of the plurality of relays 111, 112, 121, 122, 1N1, 1N2 may be implemented to be turned on in response to a fault signal. In an embodiment, each of the plurality of relays 111, 112, 121, 122, 1N1, 1N2 may include a photo relay. Here, the photo relay may be implemented as a photomos relay, a photo coupler, or the like. However, it should be understood that the configuration of the relay of the present invention is limited to the photo relay.

In the embodiment, the relays of the slave controllers 110, 120, ..., 1N0 may be connected in parallel with each other. For example, one ends F11 and F13 of the first and second relays 111 and 112 of the first slave controller 110 are connected to each other and the ends of the first and second relays 111 and 112 And the other ends F12 and F14 may be connected to each other.

In an embodiment, the slave controllers 110, 120, ..., 1N0 may be daisy-chained. For example, one end F13 of the second relay 112 of the first slave controller 110 is connected to one end F21 of the first relay 121 of the second slave controller 120, The other end F14 of the second relay 112 of the controller 110 may be connected to the other end F22 of the first relay 121 of the second slave controller 120. [ As described above, one end of the relay of one of the slave controllers and one end of the relay of the other slave controller are connected, and the other end of the relay of the controller of one slave and the other end of the relay of the other slave controller can be connected.

The connection between the master controller 200 and the first slave controller 110, the connection between the master controller 200 and the Nth slave controller 1N0, and the connection between the slave controllers 110, 120, ..., 1N0 May be implemented with a wire harness.

The master controller 200 may be configured to receive a failure signal generated upon overvoltage detection from the serially connected slave controllers 110, 120, ..., 1N0 and to disconnect the power supply to the battery in response to the received failure signal .

Further, the master controller 200 may be configured to diagnose the wire harness in order to prevent a failure signal from being transmitted properly when a wire harness is disconnected / short-circuited.

The master controller 200 includes a first resistor R1, a second resistor R2, a third resistor R3, a delay circuit 220, a latch / reset circuit 240, a power supply circuit 260, (Not shown).

The first resistor R1 may be connected between the power supply terminal VDD and the first detection terminal OPD_H. The first detection stage OPD_H may be connected to one end F11 of the first relay 111 of the first slave controller 110. [ In an embodiment, the first resistor Rl may be 430 OMEGA. On the other hand, it should be understood that the resistance value of the first resistor R1 is not limited thereto.

The second resistor R2 may be connected between the second detection terminal OPD_L and the ground terminal GND. Here, the second detection stage OPD_L may be connected to the other end F12 of the first relay 111 of the first slave controller 110. In an embodiment, the second resistor R2 may be 2K?. On the other hand, it should be understood that the resistance value of the second resistor R2 is not limited thereto.

The third resistor R3 may be connected between the first return terminal OPD_H_Return and the second return terminal OPD_L_Return. The first return stage OPD_H_Return is connected to one end FN3 of the second relay 1N2 of the Nth slave controller 1N0 and the second return stage OPD_L_Return is connected to one end FN2 of the Nth slave controller 1N0. 2 relay (1N2). In an embodiment, the third resistor R3 may be 215 OMEGA. On the other hand, it should be understood that the resistance value of the third resistor R3 is not limited thereto.

The delay circuit 220 is connected to the first detection terminal OPD_H and can be implemented to output a failure signal when a current flows through the wire harness for a predetermined time to the first detection terminal OPD_H. In an embodiment, the delay circuit 220 may be implemented with at least one delay cell.

The latch / reset circuit 240 may be configured to receive the output signal of the delay circuit 220 and to activate or deactivate the latch in response to the input signal. The latch / reset circuit 240 may also be implemented to initialize (or reset) the latch in response to a vehicle ignition signal (IG).

The power supply circuit 260 may be implemented to connect the relay source terminal (Relay_SRC) to one end (B +) of the battery in response to the output signal of the latch / reset circuit 240. Here, the relay power terminal (Relay_SRC) can receive the relay source voltage. Here, one end (B +) of the battery is a positive voltage end of the series connected battery cells, and the voltage end of the series connected battery cells may be connected to the ground end.

The power supply circuit 260 may include a power supply resistance RU, a first transistor TR, and a second transistor PM.

The power supply resistance RU may be connected between the power supply terminal VDD and the base of the first transistor TR.

The first transistor TR may include a base receiving the output signal of the latch / reset circuit 240 and an emitter connected to the ground GND. In an embodiment, the first transistor TR may comprise a bipolar transistor.

The second transistor PM may be connected between one end (B +) of the battery and the relay source terminal (Relay_SRC). The second transistor PM may include a gate coupled to the collector of the first transistor TR. In an exemplary embodiment, the second transistor PM may include a p-channel metal oxide semiconductor (PMOS) transistor.

The microcomputer 280 may be implemented to control the overall operation of the master controller 200. In an embodiment, the microcomputer 280 may include a microcontroller (MCU).

The microcomputer 280 receives signals from the first detection stage OPD_H, the second detection stage OPD_L, the output stage of the delay circuit 222 and the output stage of the latch / reset circuit 240, Diagnosis.

In addition, the microcomputer 280 receives the monitoring result value from the slave controllers 110, 120, ..., 1N0, collectively analyzes the battery failure using the received result value, the running state, the battery total voltage, And the power supply circuit 260 can be controlled according to the diagnosis result. For example, the microcomputer 280 may perform an over-voltage, an under voltage, an over temperature, an over current, an under current, an open load, Software / firmware).

The diagnostic current for the wire harness in FIG. 1 is the power supply voltage VCC -> first resistance R1 -> wire harness High -> wire harness High resistance -> second resistance R2 - It will flow to the wire harness (Low_Return) -> wire harness (low) -> third resistor (R3) -> ground (GND).

 In the following, a determination table according to the wiring state of the wire harness is exemplarily shown in FIG. 1, assuming that the first resistor R1 is 430Ω, the second resistor R2 is 2KΩ, and the third resistor R3 is 215Ω.

situation OPD_DIAG_H OPD_DIAG_L Normal (no fault occurred) 4.260V
(4.21V to 4.31V) 0.408V
(0.358V to 0.458V) Normal (Fault occurrence) 1.996V
(1.946 V to 2.046 V) 1.699V
(1.649 V to 1.749 V) High line disconnection 4.815V
(4.765V to 4.865V) 0V
(~ 0.05 V) High Line B + Paragraph 5V
(4.95 V to 5 V) 0.873V to 1.553V
(0.853 to 1.603 V) High line GND short circuit 0.454V
(0.404V to 0.504V) 0V
(~ 0.05 V)
Low line disconnection 4.815V
(4.765V to 4.865V) 0V
(~ 0.05 V) Low Line B + Paragraph 5V
(4.95 V to 5 V) 5V
(4.95 V to 5 V) Low-line GND short-circuit 4.197V
(4.158 V to 4.258 V) 0V
(~ 0.05 V)

Referring to the table, if the high line (AN5) is at least 4.7 V or the low line (AN3) is at least 0.1 V, the wiring harness (W / H) connection state is N.G. (no good).

On the other hand, the microcomputer 280 has the following result table according to the condition.

situation FAULT_OPD FAULT_OPD_LATCH Normal (no fault occurred) Low High Fault occurrence High Low Maintain Fault (Latch) Low Low Fault occurrence status, overvoltage detection circuit failure status High High

The conventional battery management system has a problem in that it can not transmit a failure signal if a wire harness is disconnected / short-circuited. On the other hand, the battery management system 10 according to the embodiment of the present invention can be implemented to cut off the voltage supply circuit 260 only in a normal overvoltage condition, by performing diagnosis of the wire harness.

2 is a diagram illustrating an exemplary slave controller 110 according to an embodiment of the present invention. Referring to FIG. 2, the slave controller 110 shows only some of the circuits corresponding to one relay 112. FIG.

The slave controller 110 may include first and second distribution resistors R1_S and R2_S, a transistor NM1, a relay 112 and a voltage detector 113. [

The first and second distribution resistors R1_S and R2_S may be connected in series with each other. One end of the first distribution resistor R1_S is connected to the positive voltage terminal of the battery cell BC1 and the other end of the first distribution resistor R1_S is connected to one end of the second distribution resistor R2, And the other end of the resistor R2_S may be connected to the negative voltage terminal of the battery cell BC1. In the embodiment, the other end of the first distribution resistor R2_S may be connected to the slave ground terminal GND_S.

The voltage detector 113 measures the cell voltage using the distribution resistance ratio of the first and second distribution resistors R1_S and R2_S to measure the cell voltage of the battery cell BC1, And may be configured to detect the state of the battery cell BC1 as an overcharged state or a steady state according to the comparison result. The voltage detector 113 detects an overcharged state when the measured cell voltage exceeds the reference voltage, and can detect the normal state when the measured cell voltage is lower than the reference voltage.

The output value of the voltage detector 113 may be connected to the gate of the transistor NM. In an embodiment, the transistor NM may comprise an n-channel metal oxide semiconductor (NMOS) transistor.

When the transistor NM is turned on according to the output value of the voltage detector 113, the relay 112 can be electrically connected by operating normally. That is, a current corresponding to the failure signal can flow.

On the other hand, for the remaining battery cells, the overvoltage can be measured and the failure signal can be generated using the configurations described above.

FIGS. 3 and 4 are flowcharts illustrating an overcharge protection operation of the battery management system 10 according to an embodiment of the present invention.

The starting of the vehicle can be turned on (S110). When the start-up of the vehicle is turned on, the battery management system (BMS) 10 may be turned on (S111). The master controller 200 operates the over-voltage protection (OPD) function and supplies the relay driving voltage to the charger / load (S112). Here, the relay driving voltage may be supplied through a line branched from the uppermost battery cell of the battery circuit or the battery pack.

Each of the slave controllers 110, 120, ..., 1N0 may measure the cell voltage of the battery cell, compare it with a predetermined reference voltage, and determine the overcharge state of the battery cell. At the same time, the master controller 200 performs a diagnosis operation on the wire harness (W / H) and determines whether the wire harness is abnormal or in a malfunction state (S113). If the wire harness W / H is abnormal or in a malfunction state, the upper system is reported (S114).

On the other hand, if the wire harness W / H is not abnormal and is not in a malfunction state, the main controller 200 determines the overcharge state in response to the failure signal transmitted from the slave controllers 110, 120, ..., 1N0 (S115). If the battery cell is not in the overcharged state, the battery cell is determined to be in the normal state, and the process can continue to the step S113. On the other hand, if the battery cell is overcharged, the latch can be activated in the latch / reset circuit 240 (S116). Here, the activation of the latch means that the data indicating the overcharge state is set.

The relay driving voltage may be disconnected from the battery in accordance with the activated latch value of the latch / reset circuit 240 in the voltage supply circuit 260 (S117). Thereafter, step S120 may be performed. As shown in FIG. 4, the master controller 200 can determine whether the start signal is changed from off to on (S120).

If the start signal is changed from OFF to ON, a wire harness (H / W) fault / malfunction state can be discriminated (S121). If the wire harness H / W is abnormal and is in a malfunction state, the OPD circuit status can be reported to the upper system (S122).

On the other hand, if the wire harness H / W is not abnormal and is not in a malfunction state, it can be determined whether the battery cell is overcharged in response to a failure signal received from the slave controllers 110, 120, ..., 1N0 (S123).

If the battery cell is overcharged, the latch state can be maintained in the latch / reset circuit 240 (S124). The relay driving voltage may be disconnected from the battery in accordance with the held latch value of the latch / reset circuit 240 (S125). Then, the user can enter the step S113 shown in FIG.

On the other hand, if the battery cell is not overcharged, the latch state in the latch / reset circuit 240 may be released (S126). The relay driving voltage may be supplied to the battery according to the released latch value of the latch / reset circuit 240 (S127). Then, the user can enter the step S113 shown in FIG.

On the other hand, if the start signal is not changed from OFF to ON in step S120, the latch state of the latch / reset circuit 240 may be maintained (S128). Thereafter, the relay driving voltage may be disconnected from the battery in accordance with the held latch value of the latch / reset circuit 240 (S129). Then, the user can enter the step S113 shown in FIG.

The steps and / or operations in accordance with the present invention may occur in different orders, in parallel, or concurrently in other embodiments for other epochs or the like, as may be understood by one of ordinary skill in the art .

Depending on the embodiment, some or all of the steps and / or operations may be performed on one or more non-transitory computer-readable media, including instructions, programs, interactive data structures, At least some of which may be implemented or performed using one or more processors. The one or more non-transitory computer-readable media can be, by way of example, software, firmware, hardware, and / or any combination thereof. Further, the functions of the "circuit" discussed herein may be implemented in software, firmware, hardware, and / or any combination thereof.

One or more non-transitory computer-readable media and / or means for implementing / performing one or more operations / steps / circuits of embodiments of the present invention may be implemented as application-specific integrated circuits (ASICs), standard integrated circuits, But are not limited to, controllers that perform appropriate instructions, including microcontrollers, and / or embedded controllers, field-programmable gate arrays (FPGAs), complex programmable logic devices (CPLDs) .

In the case of a distributed BMS according to an embodiment of the present invention, a circuit configuration and a judgment method for diagnosing a wire harness necessary for transmitting an OPD (overcharge) status of a master controller and a slave controller are disclosed.

The overdischarge is measured by using the voltage detector and distribution resistor on the slave board and the voltage of the cell is measured. When the cell voltage is higher than the set reference voltage, the output of the voltage detector can be activated. When the output is activated, current flows through the wire harness connected between the master board and the slave board.

Faults generated from the slave board can be transferred to the master board. The overdischarge is measured by using the voltage detector and distribution resistor on the slave board and the voltage of the cell is measured. When the cell voltage is higher than the set reference voltage, the output of the voltage detector can be activated. When the output is activated, current flows through the wire harness connected between the master board and the slave board. Faults generated from the slave board can be transferred to the master board. If there is a problem such as wire harness open / short, Fault signal is not transmitted. Therefore, a diagnosis is required to check the state of wire harness. The fault signal can be connected to the latch circuit via the delay circuit to prevent the overcharge circuit from operating due to the noise coming from the board external wire harness. In the case of the delay circuit, the input signal can not be seen until the set time has elapsed.

Meanwhile, the distributed BMS according to the embodiment of the present invention prevents a relay (power supply circuit) blocking phenomenon due to a misalignment (short circuit / disconnection) of wire harness necessary for transmitting an OPD situation between a master controller and a slave controller . ≪ / RTI > That is, it can be implemented so that the relay is cut off only in a normal overvoltage condition.

FIG. 5 illustrates an exemplary battery management system 20 according to another embodiment of the present invention. 5, the battery management system 20 may be implemented as a master controller 200a, which further includes a normal overvoltage discrimination circuit 210 as compared to the battery management system 10 shown in FIG.

The normal overvoltage discrimination circuit 210 can be implemented to determine whether the voltage of the first detection terminal OPD_H is in the output voltage range of the overvoltage state. That is, the normal overvoltage discrimination circuit 210 may output only the failure signal within the output voltage range of the overvoltage state and not output the failure signal within the other range.

FIG. 6 is a diagram illustrating an example of the normal overvoltage discrimination circuit 210 shown in FIG. Referring to FIG. 6, the normal overvoltage discrimination circuit 210 may include a first comparator 212, a second comparator 214, and a logic circuit 216.

The first comparator 212 may be implemented to determine whether the voltage of the first detection terminal OPD_H is smaller than the first reference voltage V1. In an embodiment, the first reference voltage V1 may be 2.1V. On the other hand, it should be understood that the level of the first reference voltage V1 is not limited thereto.

The second comparator 214 may be implemented to determine whether the voltage of the first detection terminal OPD_H is greater than the second reference voltage V2. Here, the second reference voltage V2 may be smaller than the first reference voltage V1. In an embodiment, the second reference voltage V2 may be 1.9V. On the other hand, it should be understood that the level of the first reference voltage V2 is not limited thereto.

The logic circuit 216 may be implemented to end AND the output value of the first comparator 212 and the output value of the second comparator 214. [

To configure this technique, two comparators and an AND gate device were used to enable the output only in the overvoltage output voltage range. The steady state (overvoltage x) output voltage is R2 + R3 / (R1 + R2 + R3) * VCC. The overvoltage state output voltage is R3 / (R1 + R3) * VCC.

When both comparator outputs are "high" due to the output voltage in the overvoltage condition, the relay power supply can be cut off through the delay circuit and the latch circuit. It is an invention to prevent the relay shutdown phenomenon caused by the mis-wiring (short-circuit / disconnection) situation of the wire harness. Relay can be shut off only in normal overvoltage condition.

FIG. 7 is an exemplary view showing a battery management system of a distributed structure according to an embodiment of the present invention. Referring to FIG. 7, the distributed battery management system 1000 may include a plurality of chip groups 1110, 1120, 1130, and 1140 and a BMS controller 1200. On the other hand, it should be understood that although the number of chip groups 1110, 1120, 1130, and 1140 shown in FIG. 7 is four, the number of chip groups of the present invention is not limited thereto.

Each of the chip groups 1110, 1120, 1130, 1140 may include a plurality of sensing chips IC1, IC2, IC3, IC4 connected in a daisy chain manner. Each of the plurality of sensing chips IC1, IC2, IC3 and IC4 may correspond to each of the slave controllers 110, 120, ..., 1N0 shown in Fig. 1 or Fig.

The BMS controller 1200 may be implemented to control a plurality of chip groups 1110, 1120, 1130, and 1140. The BMS controller 1200 may be implemented by either the master controller 200 shown in FIG. 1 or the master controller 200a shown in FIG. Although not shown, the BMS controller 1200 may include at least one MICOM or microcontroller to perform battery management comprehensively.

In addition, the BMS controller 1200 may include a plurality of transceivers (not shown). Each of the transceivers may be coupled to a corresponding chip group. Each of the transceivers may convert a signal according to the first communication protocol transmitted from the corresponding chip group to a signal according to the second communication protocol and transmit the converted signal to the MICOM inside the BMS controller 1200. [ Further, each of the transceivers can convert a signal according to the second communication protocol transmitted from the MICOM into a signal according to the first communication protocol, and transmit the converted signal from the corresponding chip group. Alternatively, the transceivers may be located outside the BMS controller 1200. [ For example, a transceiver corresponding to the inside of the first sensing chip IC1 may exist.

According to another aspect of the present invention, there is provided a battery management system including first slave controllers connected in a daisy chain manner and monitoring at least one battery cell among first battery cells connected in series; Second slave controllers connected in a daisy chain manner and monitoring at least one battery cell among the second serially connected battery cells; And a controller coupled to the first and second slave controllers via a wire harness for supplying a relay drive voltage to the first and second battery cells and responsive to a failure signal received from the first and second slave controllers And a master controller for interrupting a relay driving voltage supplied to the first and second battery cells, wherein the master controller can diagnose the wiring state of the wire harness.

The above-described contents of the present invention are only specific examples for carrying out the invention. The present invention will include not only concrete and practical means themselves, but also technical ideas which are abstract and conceptual ideas that can be utilized as future technologies.

10: Battery management system
110, 120, 1N0: Slave controller
200: master controller
220: delay circuit
240: latch / reset circuit
260: Power supply circuit
280: Microcomputer
210: Normal overvoltage discrimination circuit
R1, R2, R3: Resistance
111, 112: Relay
113: Voltage detector

Claims (20)

A method for overcharging a battery management system, comprising:
Supplying a relay drive voltage to the series connected battery cells;
The slave controllers and the master controller connected in series are connected by a wire harness and diagnosing the condition of the wire harness;
Determining at least one overcharge state of the battery cells in response to a failure signal transmitted from the slave controllers when the wire harness is not abnormal as a result of the diagnosis;
Activating a latch when the cell of the at least one battery is in the overcharged state; And
And disconnecting the relay drive voltage from the battery cells according to a value stored in the activated latch. The method according to claim 1,
Wherein each of the slave controllers monitors at least two voltages across the battery cells and generates the fault signal when the voltage across the two terminals is greater than a predetermined voltage. The method according to claim 1,
The step of diagnosing the condition of the wire harness includes:
And determining whether the wire harness is disconnected or short-circuited by comparing a voltage distribution of a plurality of resistors connected through the wire harness. The method according to claim 1,
Further comprising determining whether a fault signal received from the serially connected slave controllers is maintained for a predetermined period of time. The method according to claim 1,
Wherein the step of diagnosing the state of the wire harness is entered when the cell of the at least one battery is not in the overcharge state. The method according to claim 1,
Determining whether the start signal has changed from off to on; And
Wherein the step of diagnosing the condition of the wire harness is entered if the start signal is changed from off to on. The method according to claim 6,
Releasing the activated latch when there is no abnormality in the wire harness; And
And supplying the relay drive voltage to the battery cells according to a value stored in the released latch. The method according to claim 6,
Maintaining the value stored in the latch if the start signal has not changed from off to on; And
And disconnecting the relay drive voltage from the battery cells according to a value stored in the latch. Slave controllers for monitoring a voltage across each of at least two battery cells among the series connected battery cells and generating a fault signal when the both voltages are greater than a reference voltage; And
A master controller connected to the slave controllers via a wire harness and supplying a relay driving voltage to the battery cells and for interrupting a relay driving voltage supplied to the battery cells in response to a failure signal received from the slave controllers, Including,
And the master controller diagnoses the wiring state of the wire harness. 10. The method of claim 9,
Wherein at least one of the slave controllers comprises:
A battery cell;
A first distribution resistor having one end connected to the positive voltage terminal of the battery cell;
A second distribution resistor having one end connected to the other end of the 1 distribution resistor and the other end connected to the negative voltage terminal of the battery cell;
A voltage detector for comparing the voltage at one end of the 2 distribution resistor with the reference voltage;
A transistor having a gate connected to an output terminal of the voltage detector and a drain connected to a slave ground terminal; And
And a relay connected between the positive voltage terminal and the source terminal of the transistor for generating the fault signal. 11. The method of claim 10,
Wherein the relay includes a photo relay. 10. The method of claim 9,
Wherein each of the slave controllers includes at least two relays connected in parallel to transmit the fault signal to the outside. 13. The method of claim 12,
One end of each of at least two relays of any one of the slave controllers is connected to a first detecting end of the master controller,
The other end of each of the at least two relays of the one slave controller is connected to a second detection end of the master controller,
One end of each of the at least two relays of the other one of the slave controllers is connected to a first return end of the master controller,
Wherein one end of each of said at least two relays of said another slave controller is connected to a second return end of said master controller. 14. The method of claim 13,
Wherein the master controller comprises:
A first resistor connected between the power supply terminal and the first detection terminal;
A second resistor coupled between the first return stage and the second return stage; And
And a third resistor connected between the second detecting terminal and the ground terminal. 15. The method of claim 14,
Further comprising a microcomputer for diagnosing a wire connection state of the wire harness using a voltage of the first detection terminal and a voltage of the second detection terminal. 15. The method of claim 14,
A first comparator for comparing a voltage of the first detection terminal with a first reference voltage;
A second comparator for comparing a voltage of the first detection terminal with a second reference voltage; And
Further comprising a normal overvoltage discrimination circuit including a logic circuit for ANDing an output value of the first comparator and an output value of the second comparator,
Wherein the first reference voltage is greater than the second reference voltage. First slave controllers connected in a daisy chain manner to monitor at least one battery cell among the first serially connected battery cells;
Second slave controllers connected in a daisy chain manner and monitoring at least one battery cell among the second serially connected battery cells; And
Connected to the first and second slave controllers through a wire harness and supplying a relay drive voltage to the first and second battery cells and responsive to a fault signal received from the first and second slave controllers And a master controller for interrupting a relay driving voltage supplied to the first and second battery cells,
And the master controller diagnoses the wiring state of the wire harness. 18. The method of claim 17,
Wherein the master controller determines whether the voltage corresponding to the failure signal is a normal overvoltage. 18. The method of claim 17,
Wherein the master controller comprises:
A first resistor connected between the power supply terminal and the first detection terminal;
A second resistor coupled between the first return stage and the second return stage;
A third resistor connected between the second detection terminal and the ground terminal;
A delay circuit for outputting a signal corresponding to the failure signal when the voltage of the first detection stage is maintained for a predetermined time;
A latch and reset circuit for latching an output value of the delay circuit or resetting the latched value in response to a start signal; And
And a power supply circuit for disconnecting the relay driving voltage from the first and second battery cells according to an output value of the latch and reset circuit. 20. The method of claim 19,
Further comprising a microcomputer for determining a connection state of the wire harness using an output value of the delay circuit, an output value of the latch and the reset circuit, a voltage of the first detection terminal, and a voltage of the second detection terminal.

Images