KR102673513B1 - Battery management system and bms control system - Google Patents

Abstract

The present invention includes a comparison unit that compares a voltage based on a first signal received from a higher level system and a preset voltage; a control unit that outputs a feedback signal in response to the second signal output from the comparison unit; and a battery management system including a feedback unit that receives the feedback signal and changes the voltage of a terminal where the first signal is input from the higher system of the comparison unit.

Description

Battery management system and BMS control system {BATTERY MANAGEMENT SYSTEM AND BMS CONTROL SYSTEM}

The present invention relates to a battery management system that controls a battery and a BMS control device that controls the battery management system.

Recently, research and development on secondary batteries has been actively conducted. Here, the secondary battery is a battery capable of charging and discharging, and includes both conventional Ni/Cd batteries, Ni/MH batteries, etc., and recent lithium ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni/Cd batteries, Ni/MH batteries, etc. In addition, lithium-ion batteries can be manufactured in a small and lightweight form, so they are used as a power source for mobile devices. . In addition, lithium-ion batteries are attracting attention as a next-generation energy storage medium as their range of use has expanded as a power source for electric vehicles.

Additionally, secondary batteries are generally used as battery packs that include battery modules in which a plurality of battery cells are connected in series and/or parallel. And the status and operation of the battery pack are managed and controlled by a battery management system (BMS).

The control system of a device equipped with a battery pack, such as an electric vehicle, communicates with the BMS as a higher-level system and controls the BMS.

However, in a system where the upper system and BMS communicate one-way, the BMS can only receive control signals from the upper system, and the BMS cannot transmit signals to the upper system. Therefore, it is necessary to determine whether the BMS has received a signal from the upper system. There is a problem that the system cannot check it.

The purpose of the present invention is to enable a simple configuration to check whether a BMS has received a signal from a higher level system in a one-way communication system.

A battery management system according to an embodiment of the present invention includes a comparison unit that compares a voltage based on a first signal received from a higher level system and a preset voltage; a control unit that outputs a feedback signal in response to the second signal output from the comparison unit; and a feedback unit that receives the feedback signal and changes the voltage of a terminal where the first signal is input from the higher level system of the comparison unit.

In the battery management system according to an embodiment of the present invention, the feedback unit is a FET or driver that is switched on when the feedback signal is applied.

In the battery management system according to an embodiment of the present invention, the terminal where the first signal of the comparison unit is input is in a voltage state that is different from the voltage state while the first signal is not input due to the switch-on state.

In the battery management system according to an embodiment of the present invention, the battery management system receives a signal from the upper system through one-way communication.

In the battery management system according to an embodiment of the present invention, the battery management system is a vehicle battery management system, and the comparison unit receives a signal regarding the status of the vehicle from the vehicle system, which is the upper system.

In the battery management system according to an embodiment of the present invention, the control unit applies the feedback signal to the feedback unit after a predetermined time has elapsed from the end of input of the second signal from the comparison unit.

A BMS control device according to an embodiment of the present invention, comprising: a transmitter that transmits a PWM signal to a battery management system for controlling a battery; and a control unit that determines whether the PWM signal reaches the BMS by detecting a change in the voltage of the PWM signal output terminal of the transmitter after a certain period of time has elapsed from the transmission of the PWM signal.

A BMS control system according to an embodiment of the present invention, comprising: a comparison unit that compares a voltage based on a first signal received from a higher level system and a preset voltage; a control unit that outputs a feedback signal in response to the second signal output from the comparison unit; and a battery management system including a feedback unit that receives the feedback signal and changes the voltage of a terminal where the first signal is input from the higher level system of the comparison unit. and a transmitter that transmits the first signal to the battery management system for controlling the battery, and after a predetermined time has elapsed from transmission of the first signal, the transmitter detects that the voltage of the first signal output terminal of the transmitter has changed. 1. It includes a BMS control device including a control unit that determines whether a signal reaches the battery management system.

In the BMS control system according to an embodiment of the present invention, the feedback unit is a FET or driver that is switched on when the feedback signal is applied.

In the BMS control system according to an embodiment of the present invention, the terminal where the first signal of the comparison unit is input is in a voltage state that is different from the voltage state while the first signal is not input due to the switch-on state.

In the BMS control system according to an embodiment of the present invention, the changed voltage of the terminal where the first signal is input by the feedback unit turns on the switch and becomes OV.

In the BMS control system according to an embodiment of the present invention, the battery management system receives a signal through one-way communication from the upper system.

In the BMS control system according to an embodiment of the present invention, the battery management system is a vehicle battery management system, and the comparison unit receives a signal regarding the status of the vehicle from the vehicle system, which is the upper system.

A BMS control method according to an embodiment of the present invention, comprising: receiving a PWM signal from a higher level system; outputting a PWM signal to a control unit based on the received PWM signal by a comparator; A step of outputting a feedback signal to the feedback unit for a preset time after a certain period of time has elapsed by the control unit receiving the PWM signal; And the voltage of the terminal where the PWM signal is input from the upper system of the comparison unit is changed by the feedback unit that receives the feedback signal to a voltage state that is different from the voltage state when the PWM signal is not received. It includes the step of changing to , wherein the feedback unit is a FET or driver that is switched on when the feedback signal is applied.

The present invention can check whether the BMS has received a signal with a simple configuration in a battery system that performs one-way communication, making BMS control more efficient.

1 is a block diagram showing the configuration of a battery control system.
Figure 2 is a configuration diagram of a battery management system according to an embodiment of the present invention.
Figure 3 is an implementation example of a battery management system according to an embodiment of the present invention.
Figure 4 is a signal waveform at each node in the battery management system according to an embodiment of the present invention.
Figure 5 is a flowchart of a battery management method according to an embodiment of the present invention.
Figure 6 is a flowchart of a signal confirmation method of a BMS control device having a one-way system according to an embodiment of the present invention.
Figure 7 is an implementation example of a battery management system according to another embodiment of the present invention.
Figure 8 is a block diagram showing the hardware configuration of a battery management system according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention are described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives to the embodiments of the present invention. In connection with the description of the drawings, similar reference numbers may be used for similar components.

Terms used in this document are merely used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions, unless the context clearly dictates otherwise. All terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field of the present invention. Terms defined in commonly used dictionaries can be interpreted as having the same or similar meaning as the meaning they have in the context of related technology, and unless clearly defined in this document, they are not interpreted in an ideal or excessively formal sense. . In some cases, even terms defined in this document cannot be interpreted to exclude embodiments of the present invention.

Additionally, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there may be another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

Figure 1 is a configuration diagram schematically showing a battery control system including a battery pack 1 and a higher level controller 2 included in the upper level system according to an embodiment of the present invention.

As shown in FIG. 1, the battery pack 1 is composed of one or more battery cells, and is connected in series to a rechargeable battery module 10 and the + terminal side or - terminal side of the battery module 10. A battery that monitors the voltage, current, temperature, etc. of the battery pack 1 and a switching unit 22 to control the charge/discharge current flow of the battery module 10 to control and manage the battery to prevent overcharging and overdischarging. It includes a management system 20 (hereinafter also referred to as BMS (Battery Management System)).

Here, the switching unit 22 is a semiconductor switching element for controlling the current flow for charging or discharging of the battery module 10, and for example, at least one MOSFET may be used. Specifically, the switching unit 22 may include a charging switching element 22-1 that is controlled to be On when charging and a discharging switching element 22-2 that is controlled to be On when discharging.

In addition, the BMS 20 can measure or calculate the voltage and current of the gate, source, and drain of the semiconductor switching element in order to monitor the voltage, current, and temperature of the battery pack 1, and can also measure and calculate the voltage and current of the semiconductor switching device. The current of the battery pack can be measured using the current sensor 24 provided adjacent to the device. The BMS 20 is an interface that receives measured values of the various parameters described above, and may include a plurality of terminals (T1 to T5) and a circuit connected to these terminals to process the input values.

In addition, the BMS 20 may control the ON/OFF of the MOSFET by connecting terminals T6 and T7 to the gate terminal of each MOSFET, and is connected to the battery module 10 to monitor the status of the battery module 10. You can.

Since the configuration of the battery pack 1 and the BMS 20 are known, a more detailed description will be omitted.

Meanwhile, the BMS 20 according to embodiments of the present invention may be connected to the upper controller 2. The operation of the BMS 20 may be controlled based on a signal applied from the upper controller 2. In embodiments of the present invention, one-way communication is performed between the upper controller 2 and the BMS 20. However, the communication between the upper controller 2 and the BMS 20 is not necessarily limited to one-way communication, and even if the communication between the upper controller 2 and the BMS 20 is two-way communication, the upper controller 2 is connected to the BMS. The present invention can be applied if there is a configuration in which reception confirmation is not received for the signal transmitted to (20).

Below, the configuration of the battery management system 20 will be described in more detail.

Figure 2 is a configuration diagram of a battery management system 20 according to an embodiment of the present invention.

The battery management system 20 includes a comparison unit 204, a control unit 206, a feedback unit 208, a first power unit 210, and a second power unit 212.

When a control signal to be transmitted to the battery management system 20 is generated in the BMS control device 2, which is a higher-level controller, the transmitter 252 transmits the generated signal to the battery management system 20. For example, if the battery pack 1 is a battery pack for an electric vehicle, the higher level system may be a vehicle system. In this case, the BMS control device 2 in the vehicle system provides a signal indicating the state of the vehicle, such as a signal indicating the crash state of the car (s_crash) or a signal indicating the state of the power inverter module (PIM, Power Inverter Module) (s_pim). When is generated, the generated signal is transmitted to the battery management system 20. The signal generated at this time may be a signal whose state changes periodically or aperiodically during a predetermined period, such as a PWM signal. The transmitted signal is input to the comparison unit 204 of the battery management system 20. Here, when the control unit 254 generates a signal (s_crash) indicating the collision state of the car or a signal (s_pim) indicating the state of the power inverter module (PIM), it may cause the transmitter to transmit the generated signal. Also, the signal s_crash or signal s_pim may be directly transmitted to the transmitter without the control unit 254.

The comparison unit 204 receives the first signal from the BMS control device 2. The BMS control device 2 is a controller included in the upper system that controls the battery management system 20, and includes a transmitter 252, a control unit 254, and a detection unit 256.

The comparison unit 204, which receives the first signal from the BMS control device 2, outputs a High signal if the received signal is higher than the reference voltage, and outputs a Low signal if the received signal is lower than the reference voltage.

In this regard, the comparison unit 204 outputs a second signal of the same type as the received first signal. That is, while the first signal is not received from the BMS control device 2, the comparison unit 204 continues to output a signal of a certain voltage based on the pull-up circuit, and the control unit 206 outputs this signal. Receive a signal. When the comparison unit 204 receives a signal whose state has changed from the BMS control device 2, the comparison unit 204 transmits a second signal output according to the changed state to the control unit 206.

As an example, when the first signal transmitted from the BMS control device 2 is a PWM type signal, the control unit 206 maintains a constant duty ratio of 100% while the comparison unit 204 does not receive the first signal. Outputs a second signal of voltage. On the other hand, when the BMS control device 2 transmits a PWM signal to the battery management system 20 at a specific duty ratio, the comparison unit 204 alternately outputs a high signal and a low signal at the duty ratio of the received PWM signal. The PWM signal output from the comparison unit 204 is transmitted to the control unit 206.

The control unit 206, which has received the second signal as an output signal from the comparison unit 204, operates the feedback unit ( 208) outputs a feedback signal.

The feedback unit 208, which receives the feedback signal from the control unit 206 for a preset time, outputs a third signal. The detection unit 256 detects the third signal output from the feedback unit 208 and confirms that the first signal is correctly transmitted to the battery management system 20. The third signal has a voltage state that is different from the voltage state of the input terminal of the comparison unit 204 when the first signal is not received. That is, by changing the voltage state at the input terminal of the transmitter 252 through a change in the state of the feedback unit 208, the BMS control device 2 has received a PWM signal from the battery management system 20 even in a one-way system. can be detected.

The first power supply unit 210 supplies a reference voltage to the comparison unit 204, and the second power supply unit 212 supplies a reference voltage to the feedback unit 208.

Figure 3 is an implementation example of a battery management system 30 according to an embodiment of the present invention.

In this implementation, the circuit is configured as follows.

First, the comparator 302 is used as the comparison unit 204, and the voltage between resistors R1 and R3 connected in series between the power supply voltage V1 and ground is applied to one input terminal of the comparator 302 as a reference voltage. Additionally, the voltage of the connection node 308 between the power supply voltage V2 and the feedback unit 306 is applied to the other input terminal of the comparator 302. At this time, a resistor R2 may be connected between the node 308 and the power supply voltage V2. The power supply voltages V1 and V2 may be the same voltage or different voltages.

Additionally, a FET (306, or driver) is used as the feedback unit 208. The source and drain of the FET 306 may be connected between the node 308 and ground. Additionally, the control gate of the FET 306 is connected to the output terminal of the MCU 304 as the control unit 206 through a resistor R5. The terminal of the MCU 304 to which the FET 306 is connected may be a GPIO terminal, but is not limited thereto.

Hereinafter, the operation of the battery management system 30 and the BMS control device 3 will be described in detail based on the circuit implemented as described above.

Normally, a low signal is input to the gate of the FET (352) of the BMS control device (3). When a low signal is input to the gate, the FET (352) is in an open state.

When FET 352 is open, the voltage at node 308 is, for example, V2. Meanwhile, the voltage on the other input side of the comparator is the i1*R3 voltage (hereinafter referred to as voltage V3). In this case, V2 is set larger than V3 so that a high signal is output from the comparator 302. At this time, since a low signal is input to the gate of the FET 352, the output of the comparator 302 continues to output a high signal (duty = 100%).

After this, when the PWM signal is input to the gate of the FET (352), at the moment the High signal among the PWM signals is input, the FET (352) is short-circuited and current flows to R4. At this time, the voltage at node 308 is R4*V2/(R2+R4) (hereinafter referred to as voltage V4).

At this time, V4 is set to be smaller than the voltage V3 at the other input terminal of the comparator 302, so the output of the comparator 302 becomes Low.

That is, when a PWM signal is input to the gate of the FET 352, the input of the comparator 302 and the output of the comparator 302 become low while a high signal is input to the gate of the FET 352. While a low signal is input to the gate of ), the input and output of the comparator 302 become high. That is, the comparator 302 outputs a PWM signal opposite to the PWM signal input to the gate of the FET 352.

The MCU 304 receives a PWM signal from the comparator 302 through the first terminal 312. The MCU 304, which has received the PWM signal from the comparator 302, outputs a High signal through the second terminal 314 for a preset time after a certain period of time has elapsed when reception of the PWM signal ends.

The high signal output through the second terminal 314 of the MCU 304 is input to the gate of the FET 306 (or may be a driver, but will be explained based on the FET). The FET 306 to which a high signal is applied to the gate is shorted and grounds the node 308.

The grounded node 308 is connected to the source of the FET 352, and the sensor detects that the state of the node connected to the source of the FET 352 changes to a low signal, so that the BMS control device 3 performs battery management. It can be confirmed that the PWM signal is correctly transmitted to the system 30.

However, in Figure 3, the explanation is based on the case where the high and low input signals of the comparator 302 are opposite to the gate input signal of the FET 352, but the high and low states of the input and output signals of the comparator 302 Depending on the settings, it may be in the opposite state.

Additionally, a person skilled in the art will understand that the high and low states of the signals used, the types of elements used, connection relationships, etc. can be appropriately changed depending on the need or the situation at the time of circuit design.

Figure 4 is a signal waveform at each node in the battery management system according to an embodiment of the present invention.

The signal waveform at each node (Signal, N1, N2, N3) will be described with reference to the configuration of FIG. 3.

If the gate input signal of the FET 352 is not input, low signals are observed at N1, N2, and N3. Afterwards, when a PWM signal is applied to the gate input signal of the FET (352), at the moment a High signal among the PWM signals is input, the FET (352) is short-circuited and current flows to R4. At this time, the voltage at node 308 is R4*V2/(R2+R4) (hereinafter referred to as voltage V4).

At this time, V4 is set to be smaller than the voltage V3 at the other node of the comparator 302, and the output of the comparator 302 becomes Low.

That is, while a signal is input as a PWM signal to the gate of the FET 352, at the moment a high signal is input to the gate (Signal) of the FET 352, the input (N1) of the comparator 302 and the output of the comparator 302 (N2) becomes Low, and at the moment a Low signal is input to the gate (Signal) of the FET 352, the input (N1) of the comparator 302 and the output (N2) of the comparator 302 become High. That is, the comparator 302 inputs and outputs a PWM signal opposite to the PWM signal input to the gate of the FET 352.

The MCU 304 receives a PWM signal from the comparator 302 through the first terminal 312. The MCU 304, which receives the PWM signal from the comparator 302, outputs a High signal through the second terminal 314 for a preset time (t2) after a certain time (t1) has elapsed (N3).

The high signal output through the second terminal 314 of the MCU 304 is input to the gate of the FET 306 (or may be a driver, but will be explained based on the FET). The FET 306 to which a high signal is applied to the gate is shorted and grounds the node 308.

Accordingly, while a high signal is applied to the FET 306, the signal at N2 becomes low again, and accordingly, N3 also becomes low.

However, the waveform shown in FIG. 4 shows that the signal waveform and the waveforms at N1 and N2 are opposite, but High and Low can be set to be opposite so that the signal waveform and the waveforms at N1 and N2 are the same.

Figure 5 is a flowchart of a battery management method according to an embodiment of the present invention.

When a PWM signal such as a car crash or PIM signal is generated in the upper system, that is, the BMS control unit 2, and is received by the transmitter 252, a PWM signal is generated, and the PWM signal generated by the transmitter 252 is transmitted to the battery management system. It is transmitted to (20) (S500).

Here, the PWM signal is applied to the gate of the FET 352 in the BMS control device 2, and the FET 352 is switched on/off with a constant pulse according to the applied signal to the nodes 214 and 308. A PWM signal is also applied according to the voltage change. At this time, the PWM signals applied to the nodes 214 and 308 have opposite High/Low states to the PWM signals applied to the gates of the FETs 208 and 352. However, depending on the setting, the PWM signal applied to the nodes 214 and 308 may have the same High/Low state as the PWM signal applied to the gate of the FET (208 and 352).

When a PWM signal is applied from the comparison unit 204, the PWM signal is output (S502). Specifically, referring to FIG. 3 described above, when a PWM signal is input to the gate of the FET (352), at the moment a High signal among the PWM signals is input, the FET (352) is short-circuited and a current flows to R _4. do. At this time, the voltage at node 308 is R4*V2/(R2+R4) (hereinafter referred to as voltage V4).

At this time, V4 is set to be smaller than the voltage V3 at the other input of the comparator 302, and the output of the comparator 302 becomes Low.

That is, while the PWM signal is input to the gate of the FET (352), the moment a High signal is input to the gate of the FET (352), the input and output of the comparator 302 become Low, and the input and output of the comparator 302 become Low, and At the moment a low signal is input, the input and output of the comparator 302 become high. That is, the comparator 302 inputs and outputs a PWM signal opposite to the PWM signal input to the gate of the FET 352. Here, the comparator 302 is an implementation example of the comparison unit 204.

The PWM signal output from the comparison unit 204 is transmitted to the control unit 206. After receiving the PWM signal from the comparison unit 204, the control unit 206 sends a High signal through the second terminal 314 (see FIG. 3) for a preset time, for example, 3 seconds. Output (S504).

The high signal output from the control unit 206 is input to the feedback unit 208. The feedback unit 208 is, for example, a FET 306. When a high signal is input to the gate, the FET 306 is switched on and short-circuited, and the node 308 is grounded. That is, the feedback unit 208, which receives the High signal, changes the voltage of the connection terminal of the transmission unit to the upper system to OV for a preset time to enter the Low state (S506).

Accordingly, the higher level system can confirm that the PWM signal has arrived at the battery management system 20 even in a one-way system by detecting a change in the voltage of the connection terminal of the transmitter.

Figure 6 is a flowchart of a signal confirmation method of the BMS control device 2 having a one-way system according to an embodiment of the present invention.

A PWM signal is applied from the transmitter 252 to the battery management system 20 (S600). Specifically, referring to the description of FIGS. 2 and 3, for example, the transmitter 252 is a FET 352, and the FET 352 is in an open state before a PWM signal is applied to the gate.

When FET 352 is open, node 308 voltage is, for example, V2. Meanwhile, the voltage of the other input side node of the comparator is the I1*R3 voltage (hereinafter, voltage V3). In this case, V2 is set to be greater than V3, so the output of the comparator 302 outputs a High signal. At this time, since a low signal is input to the gate of the FET 352, the output of the comparator 302 continues to output a high signal.

After this, when the PWM signal is input to the gate of the FET (352), at the moment the High signal among the PWM signals is input, the FET (352) is short-circuited and current flows to R4. At this time, the voltage at node 308 is R4*V2/(R2+R4) (hereinafter referred to as voltage V4).

At this time, V4 is set to be smaller than the voltage V3 at the other node of the comparator 302, and the output of the comparator 302 becomes Low.

That is, while the PWM signal is input to the gate of the FET (352), the moment a High signal is input to the gate of the FET (352), the input and output of the comparator 302 become Low, and the input and output of the comparator 302 become Low, and At the moment a low signal is input, the input and output of the comparator 302 become high. That is, the comparator 302 inputs and outputs a PWM signal opposite to the PWM signal input to the gate of the FET 352.

Next, the MCU 304 receives a PWM signal from the comparator 302 through the first terminal 312. The MCU 304, which receives the PWM signal from the comparator 302, outputs a High signal through the second terminal 314 after a certain period of time has elapsed.

The high signal output through the second terminal 314 of the MCU 304 is input to the gate of the FET 306 (or may be a driver, but will be explained based on the FET). The FET 306 to which a high signal is applied to the gate is shorted and grounds the node 308.

When the node 308 is grounded, the connection terminal to the transmitter 252 is also grounded and the detection unit 256 detects a low signal. However, even though the PWM signal is applied from the transmitter 252, if the detection unit 256 does not detect the Low signal for a preset time after a certain period of time, the control unit 254 causes the transmitter 252 to send the PWM signal. Authorize again.

That is, after a certain period of time has elapsed, it is determined whether ground is detected at the BMS connection terminal of the transmitter 252 for a preset period of time (S602).

If ground is not detected, the PWM signal is applied again from the transmitter 252 to the battery management system 20, but the control unit 254 checks whether the number of times the PWM signal has been applied again to the battery management system 20 is more than N. If it is determined (S604) that the transmitter 252 has transmitted the PWM signal more than N times, an alarm is generated to notify of a problem in the battery management system 20 (S606). 3 to 6 illustrate the case where the signal from the upper controller is a PWM signal, the phase of the first signal and the second signal are the same, and the feedback signal is a high signal, but the case is not limited to this. That is, the signal transmitted from the upper controller to the BMS may be a signal other than PWM. Additionally, depending on the implementation type of the comparison unit, control unit, and feedback unit, the high or low state of the signal may be completely or partially opposite to the illustrated state.

Figure 7 is an implementation example of a battery management system according to another embodiment of the present invention.

Most of the configurations of the battery management system 40 shown in FIG. 7 are the same as configurations 302 to 314 of the battery management system according to an embodiment of the present invention shown in FIG. 3, and are similar to the configurations in FIG. 3. This configuration includes a resistor 716, a reverse voltage prevention diode 718, and an electrostatic discharge (ESD) capacitor 720 added to the input terminal of the comparator 702. Therefore, descriptions of the same configuration will focus on additional configurations, excluding configurations that overlap with those of FIG. 3.

Resistor 716 is connected in series between node 708 and the input of comparator 702, which receives a signal from BMS control device 3. A resistor 716 is added between the input terminal of the comparator 702 and the node 708, thereby limiting the current input to the comparator 702.

In addition, one end of the reverse voltage prevention diode 718 is connected to the node 708, and the other end of the reverse voltage prevention diode 718 is connected to the ESD capacitor 720 and the output terminal of the FET 352 of the BMS control device 30. connected. A reverse voltage prevention diode 718 is disposed between the node 708 and the output terminal of the FET 352 to prevent an output short-to-high configuration.

Additionally, one end of the ESD capacitor 720 is connected to one end of the reverse voltage prevention diode 718 and the output terminal of the FET 352, and the other end of the ESD capacitor 720 is grounded.

The ESD capacitor 720 is disposed between one end of the reverse voltage prevention diode 718 and the output of the FET 352 and ground, that is, the ESD capacitor 720 is added at a location close to the battery system 30, thereby improving ESD immunity. can be raised.

Figure 8 is a block diagram showing the hardware configuration of a battery management system according to one or another embodiment of the present invention.

The battery management system 800 includes a microcontroller (MCU; 810) that controls various processes and each configuration, an operating system program, and various programs (for example, a battery pack abnormality diagnosis program or a battery pack temperature estimation program), etc. An input/output interface 830 that provides an input interface and an output interface between the recording memory 840 and the battery cell module and/or the semiconductor switching element, and a communication interface 820 capable of communicating with the outside through a wired or wireless communication network. can be provided. In this way, the computer program according to the present invention is recorded in the memory 840 and processed by the microcontroller 810, so that it can be implemented as a module that performs each of the functional blocks shown in FIGS. 3 and 7, for example. .

Reference herein to “one embodiment” of the principles of the invention and various variations of such expressions refers to this embodiment to indicate that a particular feature, structure, characteristic, etc. is included in at least one embodiment of the principles of the invention. it means. Accordingly, the expression 'in one embodiment' and any other variations disclosed throughout this specification do not necessarily all refer to the same embodiment.

All embodiments and conditional examples disclosed throughout this specification are intended to help readers understand the principles and concepts of the present invention by those skilled in the art. It will be understood that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

200 battery management system
204 Comparison Department
206 control unit
208 Feedback Department
250 BMS control unit
302, 702 Comparison Department
304, 704 MCUs
306, 706 FET or driver
716 resistance
718 reverse voltage prevention diode
720 ESD Capacitor

Claims (14)

a comparison unit that compares a voltage based on the first signal received from a higher level system and a preset voltage;
a control unit that outputs a feedback signal in response to the second signal output from the comparison unit; and
A battery management system comprising a feedback unit that receives the feedback signal and changes the voltage of the terminal where the first signal is input from the upper system of the comparison unit to a voltage different from the voltage of the terminal before input of the first signal.
In claim 1,
A battery management system wherein the feedback unit is a FET or driver that is switched on when the feedback signal is applied.
delete In claim 1,
The battery management system is characterized in that it receives a signal from the upper system through one-way communication.
In claim 1,
The battery management system is a vehicle battery management system, and the battery management system is characterized in that the comparison unit receives a signal regarding the status of the vehicle from the vehicle system, which is the upper system.
In claim 1,
The battery management system wherein the control unit applies the feedback signal to the feedback unit after a predetermined time has elapsed from the end of input of the second signal from the comparison unit.
A transmitter that transmits a PWM signal to a battery management system for controlling the battery; and
A BMS control device comprising a control unit that determines whether the PWM signal reaches the BMS by detecting a change in the voltage of the PWM signal output terminal of the transmitter after a certain period of time has elapsed from the transmission of the PWM signal.
a comparison unit that compares a voltage based on the first signal received from a higher level system and a preset voltage; a control unit that outputs a feedback signal in response to the second signal output from the comparison unit; and a battery management system including a feedback unit that receives the feedback signal and changes the voltage of the terminal where the first signal is input from the higher system of the comparison unit to a voltage different from the voltage of the terminal before input of the first signal. and
A transmitter that transmits the first signal to the battery management system for controlling the battery, and a predetermined period of time after transmission of the first signal, detects that the voltage of the first signal output terminal of the transmitter has changed, thereby transmitting the first signal to the first signal. A BMS control system comprising a BMS control device including a control unit that determines whether a signal reaches the battery management system.
In claim 8,
The feedback unit is a BMS control system that is a FET or driver that is switched on when the feedback signal is applied.
In claim 9,
A BMS control system in which the terminal of the comparison unit where the first signal is input is in a voltage state different from the voltage state while the first signal is not input due to the switch-on state.
In claim 9,
A BMS control system in which the changed voltage of the terminal where the first signal is input by the feedback unit turns on the switch and becomes OV.
In claim 8,
The battery management system is a BMS control system characterized in that it receives signals from the upper system through one-way communication.
In claim 8,
The battery management system is a vehicle battery management system, and the BMS control system is characterized in that the comparison unit receives a signal regarding the status of the vehicle from the vehicle system, which is the upper system.
Receiving a PWM signal from a higher level system;
outputting a PWM signal to a control unit based on the received PWM signal by a comparator;
A step of outputting a feedback signal to the feedback unit for a preset time after a certain period of time has elapsed by the control unit receiving the PWM signal; and
The feedback unit, which has received the feedback signal, changes the voltage of the terminal where the PWM signal is input from the upper system of the comparator to a voltage state different from the voltage state when the PWM signal is not received during the preset time. Including the step of changing,
The BMS control method wherein the feedback unit is a FET or driver that is switched on when the feedback signal is applied.

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