KR20210111478A - System and method for managing battery - Google Patents

Abstract

According to an embodiment of the present invention, a battery managing system comprises: a first processor detecting battery condition in a low voltage region; a second processor detecting a voltage for a plurality of nodes in a high voltage region; and an isolator disposed between the first processor and the second processor. The first processor and the second processor transmit and receive a signal through the isolator, and the second processor detects the battery condition when an abnormality occurs in the first processor.

Description

Battery management system and method {System and method for managing battery}

The present invention relates to a battery management system, and more particularly, to a battery management system capable of functional safety without a separate processor and a method therefor.

As various electronic devices are applied to vehicles, vehicles are becoming closer to electronic devices rather than mechanical devices. When an electronic device applied to a vehicle does not operate normally due to a failure, or when a system related to the electronic device is shut down, normal operation of the vehicle may be difficult.

In particular, as various electronic devices are applied to parts related to vehicle and driver safety, the need for a method capable of replacing functions of the corresponding electronic devices is increasing. In the past, functional safety of electronic devices is implemented by overlapping the corresponding components. For example, in order to implement functional safety for a processor that processes a certain process, a separate processor is additionally mounted. However, when a separate processor is additionally installed, there is a problem in that a processor that does not operate during normal operation must be redundantly applied unnecessarily.

The technical problem to be solved by the present invention is to provide a battery management system and a battery management method capable of functional safety without a separate processor.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art of the position measuring unit from the following description.

In order to solve the above technical problem, a battery management system according to an embodiment of the present invention includes: a first processor for detecting a battery state in a low voltage region; a second processor sensing voltages for a plurality of nodes in a high voltage region; and an isolator disposed between the first processor and the second processor, wherein the first processor and the second processor transmit and receive signals through the isolator, and the second processor is abnormal to the first processor When this occurs, the battery state is detected.

In addition, it may include a connection line directly connected to the second processor and the battery.

In addition, a battery cell monitoring unit for monitoring the battery may be included, and the first processor and the second processor may receive battery cell monitoring information from the battery cell monitoring unit.

In addition, the first processor controls the electronic control unit according to the signal received from the second processor or the battery state, and the second processor is directly connected to the electronic control unit, and an abnormality occurs in the first processor In this case, the electronic control unit may be controlled.

In addition, the sensor unit for sensing the voltage for the plurality of nodes; and a switch unit disposed between the sensor unit and the second processor, wherein the first processor transmits monitoring request signals for the plurality of nodes to the second processor through the isolator, and the second processor may control the switch unit according to the monitoring request signal to obtain voltage values for the plurality of nodes, and transmit the obtained voltage values to the first processor through the isolator.

Also, the plurality of nodes may include at least one of nodes at both ends of the relay and at both ends of the fuse.

Also, the ground level of the low voltage region and the ground level of the high voltage region may be different from each other, the voltage used in the low voltage region may be 12V or less, and the voltage used in the high voltage region may be 500V or less.

Also, the first processor may be disposed on a first substrate, and the second processor may be disposed on a second substrate.

In order to solve the above technical problem, a battery management method according to an embodiment of the present invention includes: detecting whether a first processor for detecting a battery state in a low voltage region is abnormal; detecting the battery state by a second processor that senses voltages for a plurality of nodes in a high voltage region when an abnormality occurs in the first processor; and controlling the electronic controller according to the voltages for the plurality of nodes or the battery state detected by the second processor, wherein when the first processor is normal, the first processor detects the battery state and Controls the electronic control unit.

According to embodiments of the present invention, functional safety for the processor may be implemented without a separate processor. In addition, even when a specific processor fails, it is possible to operate without shutting down the system. Each processor receives battery cell monitoring information independently, and validity of the battery cell information can be verified, thereby increasing the reliability of the information.

The effect according to the invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 illustrates a connection of a battery management system according to an embodiment of the present invention.
2 is a block diagram of a battery management system according to an embodiment of the present invention.
3 to 6 are diagrams for explaining a battery management system according to an embodiment of the present invention.
7 is a flowchart of a battery management method according to an embodiment of the present invention.

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

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected among the embodiments. It can be used by combining or substituted with

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or one or more) of A and (and) B, C", it is combined with A, B, C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled', or 'connected' to another component, the component is directly 'connected', 'coupled', or 'connected' to the other component. In addition to the case, it may include a case of 'connected', 'coupled', or 'connected' by another element between the element and the other element.

In addition, when it is described as being formed or disposed on "above (above)" or "below (below)" of each component, "above (above)" or "below (below)" means that two components are directly connected to each other. It includes not only the case of contact, but also the case where one or more other components are formed or disposed between two components. In addition, when expressed as "upper (upper)" or "lower (lower)", the meaning of not only an upper direction but also a lower direction based on one component may be included.

1 is a diagram illustrating an example in which a battery management system 100 according to an embodiment of the present invention operates together with a battery module 110 and a battery energy management (BEM) 120 .

The battery management system 100 according to an embodiment may operate in conjunction with the battery 110 and the BEM 120 . The battery management system 100 may monitor the states of the battery 110 and the BEM 120 . Specifically, the battery management system 100 may monitor various states by sensing voltages for a plurality of nodes connected to the battery 110 , and may output the monitored results. For example, the battery management system 100 may output an alarm when a relay or a fuse does not perform a normal operation.

2 is a block diagram of a battery management system 100 according to an embodiment of the present invention.

The battery management system 100 according to an embodiment of the present invention includes a first processor 210 , a second processor 230 , and an isolator 220 , such as a memory (not shown) or a communication module (not shown). may include. The battery management system 100 according to an embodiment of the present invention includes a low voltage region and a high voltage region.

The first processor 210 detects a battery state in a low voltage region, and the second processor 230 detects voltages for a plurality of nodes in a high voltage region. The first processor 210 and the second processor 230 perform different roles in the low voltage region and the high voltage region, respectively.

The first processor 210 is disposed in the low voltage region to detect the battery state. In battery management, it is important to monitor the charge/discharge state of the battery, and the first processor 210 senses the battery state to determine the charge/discharge state of the battery.

The battery 110 may include a battery cell monitoring unit 240 for monitoring battery cells, and the first processor 210 may receive battery cell monitoring information from the battery cell monitoring unit 240 . In this case, the first processor 210 may receive the battery monitoring information through the connection line 250 with the battery 110 .

The second processor 230 senses voltages for a plurality of nodes receiving voltages from the battery. Here, the plurality of nodes detected by the second processor 230 are nodes for which voltage is measured by the BEM 120 , and the plurality of nodes may include at least one of both ends of a relay and a node between both ends of a fuse.

The charging/discharging of the battery or control of the device connected to the battery is required according to the voltage values of the nodes receiving the voltage from the battery, and the second processor 230 detects the voltages for the plurality of nodes receiving the voltage from the battery. do.

The isolator 220 is disposed between the first processor 210 and the second processor 230 , and the first processor 210 and the second processor 230 transmit and receive signals through the isolator 220 . The isolator 220 connects the low voltage region and the high voltage region. The voltages for the plurality of nodes detected by the second processor 230 are received by the first processor 210 and the first processor 210 and the second processor 230 communicate with each other in order to perform battery management. can do. In this case, the first processor 210 and the second processor 230 may communicate through the isolator 220 .

The second processor 230 detects voltages of the plurality of nodes and, when an abnormality occurs in the first processor 210 , detects a battery state. When a situation occurs in which it is difficult for the first processor 210 to operate normally, such as when the first processor 210 does not operate normally, or a connection line such as a communication line connected to the first processor 210 is short-circuited, the first processor ( 210), it can be determined that an abnormality has occurred.

When an abnormality occurs in the first processor 210 , it is difficult for the first processor 210 to detect the battery state, and the battery management system 100 may be difficult to operate because it is not possible to detect the battery state. In order for the battery management system 100 to operate even when an abnormality occurs in the first processor 210 , it is necessary to replace the operation of the first processor 210 by another processor. 1 Replaces the operation of the processor 210 . That is, the second processor 230 replaces the first processor 210 to detect the battery state.

When an abnormality occurs in the first processor 210 , the second processor 230 may include a connection line 260 directly connected to the second processor 230 and the battery 110 in order to detect the battery state. have. When the first processor 210 operates normally, the battery cell monitoring information is transmitted from the battery cell monitoring unit 240 to the first processor 210 through the connection line 250 , and the first processor 210 is abnormal. When this occurs, the battery cell monitoring information cannot be transmitted through the corresponding connection line 250. In this case, the battery cell monitoring information is transmitted through the connection line 260 directly connected to the second processor 230, The second processor 230 may detect the battery state.

As shown in FIG. 3 , the second processor 230 performs a function 231 to be performed in the high voltage region and can replace the first processor 210 when an error occurs in the first processor 210 . A redundancy function 232 of the first processor may be performed. Since the functional safety of the first processor 210 is implemented using the second processor 230 that performs a function in the high voltage region, a separate processor for functional safety of the first processor 210 is not required, so an unnecessary processor increase can be prevented.

The second processor 230 may detect the battery simultaneously with the first processor 210 without performing a function of detecting the battery only when an abnormality occurs in the first processor 210 . The first processor 210 and the second processor 230 respectively detect a battery and compare the detected information to increase the accuracy of battery detection. Through this, reliability of battery management can be improved.

The battery management system 100 may include a low voltage region 401 and a high voltage region 402 as shown in FIG. 4 . The first processor 210 may operate in the low voltage region 401 , and the second processor 230 may operate in the high voltage region 402 . Also, an isolator 220 may be disposed between the first processor 210 and the second processor 230 . The first processor 210 and the second processor 230 may transmit and receive information to each other through the isolator 220 .

The low voltage region 401 and the high voltage region 402 may operate in different voltage ranges. For example, the voltage used in the low voltage region 401 may be 0 to 12 V, and the voltage used in the high voltage region 402 may be 0 to 500 V. Specifically, the voltage range in which the module included in the high voltage region 402 operates may be 300 to 500 V.

Also, the ground level of the low voltage region 401 and the ground level of the high voltage region 402 may be different from each other. The ground of the low voltage region 401 and the ground of the high voltage region 402 may not be electrically connected to each other. The ground of the low voltage region 401 and the ground of the high voltage region 402 may be electrically separated.

The first processor 210 may be disposed on the first substrate, and the second processor 230 may be disposed on the second substrate. Modules operating in the low voltage region 401 may be disposed on a first substrate, and modules operating in the high voltage region 402 may be disposed on a second substrate. In addition, the isolator 220 may be disposed on the first substrate or the second substrate, or may be disposed on both the first substrate and the second substrate, and may electrically connect the first substrate and the second substrate and simultaneously electrically disconnect the first substrate and the second substrate. . The isolator 220 may transmit information between the first substrate and the second substrate, but may block electrical connections other than a predetermined route. For example, the isolator 220 may block a leakage current between the first substrate and the second substrate.

The first processor 210 and the second processor 230 may perform a communication function. The first processor 210 or the second processor 230 may communicate with the outside using a Wi-Fi chip, a Bluetooth chip, or the like, and may communicate with an internal module according to a set protocol. The Wi-Fi chip and the Bluetooth chip may perform communication using a Wi-Fi method and a Bluetooth method, respectively. In the case of using a Wi-Fi chip or a Bluetooth chip, various types of connection information such as an SSID and a session key are first transmitted/received, and then various types of information may be transmitted/received after communication connection using this. The wireless communication chip may perform communication according to various communication standards such as IEEE, ZigBee, 3rd Generation (3G), 3rd Generation Partnership Project (3GPP), and Long Term Evolution (LTE). The NFC chip may operate in a near field communication (NFC) method using a 13.56 MHz band among various RF-ID frequency bands such as 135 kHz, 13.56 MHz, 433 MHz, 860 to 960 MHz, and 2.45 GHz. In addition, the first processor 210 or the second processor 230 may perform communication through a LIN (Local Interconnect Network) bus or a LIN interface.

When the second processor 230 senses the voltages for the plurality of nodes, the sensor unit 420 for sensing the voltages for the plurality of nodes is disposed between the sensor unit 420 and the second processor 230 . It may include a switch unit 410 . At this time, the first processor 210 transmits the monitoring request signals for the plurality of nodes to the second processor 230 through the isolator 220, and the second processor 230 switches according to the monitoring request signal. The unit 410 may be controlled to obtain voltage values for the plurality of nodes, and the obtained voltage values may be transmitted to the first processor 210 through the isolator 220 .

First, the first processor 210 may transmit monitoring request signals for a plurality of nodes to the second processor 230 through the isolator 220 . In addition, the second processor 230 controls the switch unit 410 according to the monitoring request signal to obtain voltage values for a plurality of nodes, and applies the obtained voltage values to the first processor 210 through the isolator 220 . can be sent to

The sensor unit 420 may sense voltages for a plurality of nodes. Also, a switch unit 410 may be disposed between the sensor unit 420 and the second processor 230 . The switch unit 410 may include a plurality of switches, and the sensor unit 420 may include a plurality of sensors corresponding to the plurality of switches.

The switch unit 410 may be controlled by the second processor 230 . In addition, the switch unit 410 may control the current applied to the sensor unit 420 . For example, when the switch unit 410 is turned on, a current is connected to the sensor unit 420 , and when the switch unit 410 is turned off, the current connected to the sensor unit 420 may be cut off. Specifically, when a plurality of switches connected to the switch unit 410 are turned on, current may be applied to each of the plurality of sensors included in the sensor unit 420 . In addition, when a plurality of switches connected to the switch unit 410 are turned off, currents may be cut off in each of the plurality of sensors included in the sensor unit 420 .

The plurality of nodes may include at least one of nodes at both ends of the relay and at both ends of the fuse. The relay according to an embodiment may include a module that transmits high voltage power applied from a battery to at least one of a motor, an output terminal, and a display. In addition, the fuse may include a module or device that blocks the current when a current or voltage greater than or equal to a preset value is applied. A more specific embodiment of a plurality of nodes will be described later with reference to FIG. 6 .

The first processor 210 may provide information on charging and discharging states of the battery. For example, the first processor 210 may output information indicating the current state of charge of the battery or when the battery is fully charged or discharged.

Referring to FIG. 2 , as one isolator 220 is disposed between the first processor 210 and the second processor 230 , the number of sensors included in the sensor unit 420 is plural, and the switch unit 410 . ), although the number of switches included in the plurality of switches is plural, the battery management system 100 may implement battery management with one isolator 220 . It goes without saying that the high voltage region and the low voltage region may be connected through a plurality of isolators as well as one isolator.

The first processor 210 may not only sense the battery state, but also control the electronic controller according to a signal received from the second processor 230 or the battery state. The second processor 230 is directly connected to the electronic controller, and may control the electronic controller when an abnormality occurs in the first processor 210 .

As shown in FIG. 5 , the first processor 210 may be connected to the ECU, which is the electronic controller 530 , and may control the electronic controller 530 according to a signal received from the second processor 230 or a battery state. The second processor 230 may receive a voltage value from the measurement unit 520 that measures the voltage of the BEM 120 , and the measurement unit 520 may include a plurality of sensors and switches. Power of the battery module 510 may be applied to the BEM 120 , and voltage values for a plurality of nodes included in the BEM 120 may be sensed by the measurement unit 520 and transmitted to the second processor 230 . . The second processor 230 may transmit the voltage value sensed by the measuring unit 520 to the first processor 210 through the isolator 220 . When the voltage value received from the measurement unit 520 is an analog value, the second processor 230 may convert the analog voltage value into a digital voltage value and transmit it to the first processor 210 .

An electronic control unit (ECU) controls a device that receives voltage from a battery. For example, the electronic controller 530 may control an electronic module of a vehicle, such as a heater, a power supply, a real-time clock, crash ENS control, CAN communication, and the like. The electronic controller 530 may be controlled through a control signal received from the first processor 210 . For example, the first processor 210 may control the electronic controller 530 to output an alarm indicating the state of the battery (eg, charging, discharging, abnormal occurrence) through a signal received from the second processor 230 . can At this time, the first processor 210 transmits a control signal through the electronic control unit 530 and the connection line 540 .

When an abnormality occurs in the first processor 210 , it is difficult for the first processor 210 to control the electronic control unit 530 . Even when an abnormality occurs in the first processor 210 , it is difficult to control the electronic control unit 530 . To this end, the second processor 230 may control the electronic controller 530 through a connection line 550 directly connected to the electronic controller 530 . Through this, even when an abnormality occurs in the first processor 210 , the battery management system 100 may operate normally.

6 is a diagram for explaining a plurality of nodes 671 to 683 detected by the second processor 230 .

A plurality of nodes 671 - 683 may be included in some section 690 of the BEM. Some section 690 of the BEM includes a plurality of relays 641 , 642 , 643 , 644 , 645 , 646 , 647 , 651 , 652 , 653 , a plurality of fuses 631 , 632 , 633 , a plurality of resistors 661 , 662 , 663 ) and a plurality of nodes 671 , 672 , 673 , 674 , 675 , 676 , 677 , 678 , 679 , 680 , 681 , 682 , and 683 may be included. Also, some sections 690 of the BEM may be connected to a plurality of output terminals 621 , 622 , 623 , and 624 . The first output terminal 621 , the second output terminal 622 , the third output terminal 623 , and the fourth output terminal 624 may perform different operations, respectively. For example, the first output terminal 621 applies power to the Aux, the second output terminal 622 applies power to the front traction motor, and the third output terminal 623 applies power to the rear traction motor. In addition, the fourth output terminal 624 may apply power to the DC charging port.

A voltage may be applied to the plurality of nodes 671 to 683 through power applied from the battery module 610 . The plurality of nodes 671 to 683 connects at least one of the nodes at both ends of the relays 641, 642, 643, 644, 645, 646, 647, 651, 652, and 653 and at both ends of the fuses 631, 632, and 633. may include The relays 641 , 642 , 643 , 644 , 645 , 646 , 647 , 651 , 652 , and 653 transmit high voltage power applied from the battery module 610 to the motor, output terminals 621 , 622 , 623 , 624 , and a display. It may include a module that delivers at least one of them. In addition, the fuses 631 , 632 , and 633 may include a module or device that blocks a current when a current or voltage greater than or equal to a preset value is applied.

7 is a flowchart of a battery management method according to an embodiment of the present invention. A detailed description of each step of FIG. 7 corresponds to the detailed description of the battery management system of FIGS. 1 to 6 , and a redundant description will be omitted below.

In battery management, in step S11, it is detected whether the first processor for detecting the battery state in the low voltage region is abnormal.

When the first processor is normal, the first processor detects the battery state and controls the electronic controller. Specifically, the first processor operating in the low voltage region transmits monitoring request signals for the plurality of nodes to the second processor operating in the high voltage region through the isolator, and the second processor obtains voltage values for the plurality of nodes . Through one or more switches and one or more sensors operating in the high voltage region, the second processor may acquire voltage values for the plurality of nodes, and the second processor may convert the acquired voltage values into digital signals. The second processor transmits the obtained voltage value to the first processor through the isolator. In this case, the voltage value transmitted through the isolator may be converted into a digital signal and transmitted.

When an abnormality occurs in the first processor, a second processor that detects voltages for a plurality of nodes in a high voltage region in step S12 detects the battery state, and in step S13, The electronic control unit is controlled according to the voltage or the battery state. Even if an abnormality occurs in the first processor, the second processor detects the battery state instead of the first processor, and controls the electronic controller according to the voltages for a plurality of nodes detected by the second processor or the battery state, thereby causing an abnormality in the first processor. Even if this occurs, it is possible to operate normally without shutting down the battery management system.

Meanwhile, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium. In addition, the structure of the data used in the above-described method may be recorded in a computer-readable recording medium through various means. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (eg, ROM, RAM, USB, floppy disk, hard disk, etc.) and an optically readable medium (eg, CD-ROM, DVD, etc.) do.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can realize that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: battery management system
110, 510: battery
120: BEM
210: first processor
220: isolator
230: second processor
240: battery cell monitor
410: switch unit
420: sensor unit
530: ECU (electronic control unit)

Claims (10)

a first processor for detecting a battery state in a low voltage region;
a second processor sensing voltages for a plurality of nodes in a high voltage region; and
an isolator disposed between the first processor and the second processor;
The first processor and the second processor transmit and receive signals through the isolator,
The second processor,
When an abnormality occurs in the first processor, the battery management system detects the state of the battery. According to claim 1,
and a connection line directly connected to the second processor and the battery. According to claim 1,
A battery cell monitoring unit for monitoring the battery,
The first processor and the second processor receive battery cell monitoring information from the battery cell monitoring unit. According to claim 1,
The first processor,
Controls the electronic controller according to the signal received from the second processor or the battery state,
The second processor,
A battery management system that is directly connected to the electronic controller and controls the electronic controller when an error occurs in the first processor. According to claim 1,
a sensor unit for sensing voltages for the plurality of nodes; and
a switch unit disposed between the sensor unit and the second processor;
The first processor,
Transmitting a monitoring request signal for the plurality of nodes to the second processor through the isolator,
The second processor,
The battery management system controls the switch unit according to the monitoring request signal to obtain voltage values for the plurality of nodes, and transmits the obtained voltage values to the first processor through the isolator. According to claim 1,
The plurality of nodes includes at least one of nodes at both ends of a relay and at both ends of a fuse. According to claim 1,
a ground level of the low voltage region and a ground level of the high voltage region are different from each other;
The voltage used in the low voltage region is 12V or less,
The voltage used in the high voltage region is 500V or less, the battery management system. According to claim 1,
The first processor is disposed on a first substrate,
The second processor is a battery management system disposed on a second substrate. detecting whether a first processor for detecting a battery state in a low voltage region is abnormal;
detecting the battery state by a second processor that senses voltages for a plurality of nodes in a high voltage region when an abnormality occurs in the first processor; and
and controlling the electronic controller according to the voltages for the plurality of nodes detected by the second processor or the battery state,
When the first processor is normal, the first processor detects the battery state and controls the electronic controller. A computer-readable recording medium in which a program for executing the method of claim 9 is recorded on a computer.

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