KR20230064967A - Apparatus and method for processing bms data - Google Patents

Abstract

A BMS data processing apparatus according to an embodiment of the present invention includes a communication module including a reception buffer for storing periodically received data; and a controller that acquires at least some of the data stored in the reception buffer and performs one or more tasks related to a battery management system (BMS), wherein the controller determines that the data stored in the reception buffer exceeds a threshold even if there is a task in operation. In the early case, the receiving buffer may be updated by temporarily stopping the running task and performing a data acquisition operation on at least some data stored in the receiving buffer.

Description

BMS data processing device and method {APPARATUS AND METHOD FOR PROCESSING BMS DATA}

The present invention relates to an apparatus and method for processing BMS data, and more particularly, to an apparatus and method for processing BMS (Battery Management System) related data for managing a battery system.

A secondary battery, which is a battery that can be recharged after use and reused, is manufactured as a battery module or battery pack made by connecting a plurality of battery cells in series according to the output capacity required by the device, and is used as a power source for various devices. Such a battery is used in various fields ranging from electric bicycles, electric vehicles, and energy storage systems (ESS) as well as small high-tech electronic devices such as smart phones.

A battery module or battery pack is a structure in which a plurality of battery cells are combined, and in the case of overvoltage, overcurrent, or overheating in some battery cells, problems occur in the safety and operational efficiency of the battery module or battery pack. means are essential. Accordingly, a battery management system (BMS) that measures voltage values of each battery cell and monitors and controls voltage states of the battery cells based on the measured values is installed in the battery module or battery pack.

The BMS communicates with other modules or systems within the device containing the battery system as needed. At this time, when communicating with a module or system having a fast cycle, a problem may occur in system control due to an imbalance between a data reception speed and a processing speed in the BMS.

WO2018-056264

An object of the present invention to solve the above problems is to provide a BMS data processing device.

Another object of the present invention to solve the above problems is to provide a data processing method by a battery management system (BMS) for managing a battery system.

BMS data processing apparatus according to an embodiment of the present invention for achieving the above object, a communication module including a reception buffer for storing data received periodically; and a controller that acquires at least some of the data stored in the reception buffer and performs one or more tasks related to a battery management system (BMS), wherein the controller determines that the data stored in the reception buffer exceeds a threshold even if there is a task in operation. In the early case, the receiving buffer may be updated by temporarily stopping the running task and performing a data acquisition operation on at least some data stored in the receiving buffer.

The controller may perform a data acquisition operation on at least some data stored in the reception buffer in a time interval in which there is no task in operation.

The communication module may communicate with other systems or modules in a device including a battery system using a controller area network (CAN) method.

The controller may restart the suspended task after updating the reception buffer.

BMS data processing method according to an embodiment of the present invention for achieving the other object is a method for processing data by a battery management system (BMS) that manages a battery system, and stores periodically received data in a reception buffer. doing; determining whether there is a task being performed by the BMS; determining whether data stored in the reception buffer is greater than or equal to a threshold value when there is a task being performed; suspending the task being performed when the data stored in the reception buffer is equal to or greater than a threshold value; The method may include obtaining data for at least some data stored in the reception buffer and updating the reception buffer.

The method for processing BMS data further includes obtaining data for at least some data stored in the reception buffer and updating the reception buffer when there is no task being performed as a result of determining whether there is a task being performed by the BMS. can do.

The BMS may communicate with other systems or modules in a device including the battery system using a controller area network (CAN) method.

The BMS data processing method may further include restarting a suspended task after updating the receive buffer.

According to the embodiment of the present invention as described above, even when the BMS receives data in a fast cycle, it is possible to minimize the problem of the receiving buffer reaching its capacity limit.

Accordingly, data loss due to excess buffer capacity can be prevented, and smooth system operation is possible even when real-time processing is required.

1 shows the structure of a battery system to which the present invention can be applied.
2 is a block diagram of a battery management device according to an embodiment of the present invention.
3 is a diagram for explaining a data reception error occurring in a BMS communicating with a system having a fast cycle.
4 is a diagram for explaining an operation of a controller and a state of a receive buffer according to a data processing method according to an embodiment of the present invention.
5 is a flowchart of a data processing method according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numbers have been used for like elements throughout the description of each figure.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term “and/or” includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is 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, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, 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 the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

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

1 shows the structure of a battery system to which the present invention can be applied.

In FIG. 1 , a battery pack or battery module may include a plurality of battery cells connected in series. A battery cell or module may be charged/discharged by being connected to a load through a positive terminal and a negative terminal. The most commonly used battery cell is a lithium-ion (Li-Ion) battery cell.

A battery management system (BMS) 100 may be installed in such a battery module or battery pack. The BMS monitors the current, voltage, and temperature of each battery pack it manages, calculates SOC (Status Of Charge) based on the monitoring result, and controls charging and discharging. Here, State of Charge (SOC) is the current charged state of the battery expressed in percentage [%], and SOH (State of Health; State of Battery Life) is the current state of deterioration of the battery expressed in percentage [%]. .

As such, the BMS monitors the battery cells, reads the cell voltage, and transmits it to other systems connected to the battery. The BMS also balances the charge of the battery cells equally to prolong the life of the battery system.

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

In order to perform the operation described above, the BMS 100 may include various components such as a fuse, a current sensing element, a thermistor, a switch, and a balancer. ) or BMIC (Battery Monitoring Integrated Chip) in most cases. Here, the BMIC may be an IC type component that is located inside the BMS and measures information such as voltage, temperature, and current of the battery cell/module.

The BMS also monitors the battery cells and reads the cell voltage and forwards it to other systems connected to the battery. To this end, the BMS includes a communication module 120 for communicating with other systems in the device including the battery system. The communication module of the BMS can communicate with other systems in the device using CAN (Controller Area Network). In this case, parts, modules or systems within the BMS are connected to each other via the CAN bus.

CAN communication (Controller Area Network) is a standard communication specification designed to allow microcontrollers or devices to communicate with each other without a host computer in a vehicle. CAN communication is a non-host bus type message-based network protocol mainly used for communication between controllers, and is mainly used in vehicles.

The communication module 120 may include a buffer 121 that temporarily stores data received from other modules or systems. In the embodiment of FIG. 2 , the buffer 121 is shown as being located within the communication module 120, but may be located outside the communication module.

3 is a diagram for explaining a data reception error occurring in a BMS communicating with a system having a fast cycle.

In the BMS, data 31 received by the BMS from another system through CAN communication is periodically generated. At this time, the received data is temporarily stored in the receive buffer 33. A buffer has a certain capacity. Therefore, when the buffer is full, data received into the buffer cannot be stored in the buffer.

The example of FIG. 3 shows a case in which task 1 and task 2 are simultaneously performed by the BMS. As shown in FIG. 3 , each task may include a running time section and an idle time section. The MCU of a typical BMS performs operation 32 of obtaining data stored in the buffer only when both task 1 and task 2 are in a dormant state, that is, when the MCU is in a dormant state.

Therefore, if the buffer is in a full state before the controller retrieves the data stored in the buffer, data received through the CAN bus may not be stored in the buffer and may be lost. This phenomenon can occur particularly frequently in BMSs communicating with systems with fast operating cycles. That is, when the processing speed of the MCU is slower than the CAN reception speed, data acquisition cannot be performed in a timely manner due to the buffer pool in the process of receiving and processing data. Therefore, reliability of the main data and communication received at this time cannot be guaranteed. This can lead to a very serious situation where close control is required (for example, in the case of a real time operating system (RTOS)), system downtime.

In order to solve this problem, the present invention proposes a data processing method in which a controller reads data stored in a buffer in consideration of a state of the buffer so as not to miss received data.

4 is a diagram for explaining an operation of a controller and a state of a receive buffer according to a data processing method according to an embodiment of the present invention.

In the BMS according to the present invention, data 1 periodically received from other systems occurs. The embodiment of FIG. 4 also shows a case in which task 1 and task 2 are simultaneously performed by the BMS. As shown in FIG. 4 , each task may include a running time section and an idle time section.

According to an embodiment of the present invention, even if there is a task in operation, when the receiving buffer reaches the data storage threshold, the controller temporarily suspends the task in operation and performs the data acquisition operation 2 for at least some data stored in the receiving buffer. carry out

The controller may apply the receive buffer update operation to a part that is slower than the data reception speed, that is, a routine that performs a function faster than the communication processing routine.

Therefore, as shown in FIG. 4, the data reception buffer 3 according to the present invention does not reach a full state and thus data loss does not occur.

5 is a flowchart of a data processing method according to an embodiment of the present invention.

The data processing method according to an embodiment of the present invention may be performed by a controller in the BMS, that is, an MCU, but the operation subject of the method according to the present invention is not limited thereto.

The controller stores periodically received data in a reception buffer (S510).

The controller checks whether there is no task in operation (S520), and if there is no task in operation, updates the reception buffer by performing a data acquisition operation on at least some data stored in the reception buffer (S521). At this time, the controller may bring all data stored in the receive buffer.

On the other hand, the controller checks whether the data stored in the reception buffer is equal to or greater than the threshold when not in a dormant state, that is, even if there is a task in operation (S530). When the data stored in the reception buffer reaches the critical value, the currently operating task is temporarily suspended (S540), and a data acquisition operation is performed on at least some data stored in the reception buffer to update the reception buffer (S550). The controller restarts the suspended task after updating the reception buffer (S550).

The operation of the method according to the embodiment of the present invention can be implemented as a computer readable program or code on a computer readable recording medium. A computer-readable recording medium includes all types of recording devices in which data that can be read by a computer system is stored. In addition, computer-readable recording media may be distributed to computer systems connected through a network to store and execute computer-readable programs or codes in a distributed manner.

Although some aspects of the present invention have been described in the context of an apparatus, it may also represent a description according to a corresponding method, where a block or apparatus corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by a corresponding block or item or a corresponding feature of a device. Some or all of the method steps may be performed by (or using) a hardware device such as, for example, a microprocessor, programmable computer, or electronic circuitry. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

100: BMS 120: communication module
121: receive buffer

Claims (8)

a communication module including a reception buffer for storing periodically received data; and
A controller that acquires at least some of the data stored in the reception buffer and performs one or more BMS (Battery Management System) related tasks;
Even if there is a task in operation, the controller suspends the task in operation when the data stored in the reception buffer reaches a threshold value and performs a data acquisition operation on at least some data stored in the reception buffer to update the reception buffer. BMS data processing unit. The method of claim 1,
The controller,
A BMS data processing device that performs a data acquisition operation for at least some data stored in the reception buffer in a time interval in which there is no task in operation. The method of claim 1,
The communication module communicates with other systems or modules in a device including a battery system using a controller area network (CAN) method. The method of claim 1,
The controller,
Restarting the suspended task after updating the receive buffer, the BMS data processing device. As a method for processing data by a BMS (Battery Management System) that manages a battery system,
Storing periodically received data in a reception buffer;
determining whether there is a task being performed by the BMS;
determining whether data stored in the reception buffer is greater than or equal to a threshold value when there is a task being performed;
suspending the task being performed when the data stored in the reception buffer is equal to or greater than a threshold value;
and obtaining data for at least some data stored in the reception buffer and updating the reception buffer. The method of claim 5,
If there is no task being performed as a result of determining whether there is a task being performed by the BMS,
Further comprising the step of updating the receiving buffer by obtaining data for at least some data stored in the receiving buffer. The method of claim 5,
The BMS uses a CAN (Controller Area Network) method to communicate with other systems or modules in a device including the battery system, BMS data processing method. The method of claim 5,
Further comprising the step of restarting the suspended task after updating the receive buffer, BMS data processing method.

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