KR20240000294A - Apparatus for managing battery and operating method of the same - Google Patents

Abstract

A battery management device according to one embodiment disclosed in the present document comprises: a voltage measurement part that measures a voltage of each of a plurality of battery banks of a battery module; and a controller that detects a voltage change of a first battery bank among the plurality of battery banks, and enables a state of the first battery bank to be diagnosed based on a voltage change of at least one second battery bank associated with the first battery bank. Therefore, the present invention is capable of diagnosing a thermal runaway phenomenon of the battery bank.

Description

Battery management device and operating method thereof {APPARATUS FOR MANAGING BATTERY AND OPERATING METHOD OF THE SAME}

Embodiments disclosed herein relate to a battery management device and method of operating the same.

Electric vehicles receive electricity from outside, charge the battery, and then obtain power by driving the motor with the voltage charged in the battery. Electric vehicle batteries can generate heat due to chemical reactions that occur during the charging and discharging process, and this heat can damage the performance and lifespan of the battery. Therefore, a battery management system (BMS) that monitors the temperature, voltage, and current of the battery is operated to diagnose and control the state of the battery.

When thermal runaway of a specific individual cell inside the battery pack occurs, chain ignition inside the battery pack may occur, so the battery management device must diagnose the battery cell in which thermal runaway occurred. However, methods for detecting thermal runaway in conventional battery management devices include calculating the reduction rate of the average battery cell voltage compared to the single battery cell voltage or measuring rapid changes in temperature, but voltage fluctuations and battery cell temperature due to noise inside the battery pack There is a problem in that it is difficult to detect temperature changes in battery cells due to the sensing point being far from the source of heat or problems with the number and placement of temperature sensors.

One purpose of the embodiments disclosed in this document is to provide a battery management device that can diagnose thermal runaway of a battery bank based on a voltage change phenomenon between adjacent battery banks within a battery pack and a method of operating the same.

The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A battery management device according to an embodiment disclosed in this document includes a voltage measuring unit that measures the voltage of each of a plurality of battery banks of a battery module, detects a voltage change in a first battery bank among the plurality of battery banks, and the first battery bank. The state of the first battery bank may be diagnosed based on a change in voltage of at least one second battery bank related to the battery bank.

According to one embodiment, when the voltage change rate of the first battery bank is greater than or equal to a threshold value, the controller may determine that a voltage change has occurred in the first battery bank.

According to one embodiment, the plurality of battery banks include a plurality of battery cells, and the controller identifies a battery cell whose voltage change rate is greater than a threshold value among the plurality of battery cells, and configures the battery bank including the battery cell. It may be determined as the first battery bank.

According to one embodiment, when the controller detects a voltage change in the first battery bank, the controller connects the at least one second battery bank adjacent to the first battery bank based on a pre-stored arrangement order of the plurality of battery banks. Voltage changes can be analyzed.

According to one embodiment, the controller divides the first battery bank in which the voltage change is detected into a first group based on the arrangement order of the plurality of battery banks, and selects the first battery bank among the at least one second battery bank. At least one battery bank in contact with group 1 is divided into a second group, and among the at least one second battery bank, at least one battery bank in contact with the second group is divided into a third group, and the first battery bank is divided into a third group. Voltage changes in the group, the second group, and the third group may be analyzed sequentially.

According to one embodiment, when the controller detects a voltage change in the first battery bank, the controller divides the first battery bank into the first group and connects at least one battery bank in contact with the first group to the first group. The voltage change of the second group can be analyzed by dividing the second group.

According to one embodiment, when the controller detects a voltage change in the second group, the controller divides at least one battery bank in contact with the second group into the third group and analyzes the voltage change in the third group. can do.

According to one embodiment, when the controller detects a voltage change in the third group, the controller may diagnose thermal runaway of the first battery bank divided into the first group.

A method of operating a battery management device according to an embodiment disclosed in this document includes measuring the voltage of each of a plurality of battery banks of a battery module; Detecting a voltage change in a first battery bank among the plurality of battery banks; Analyzing a voltage change in at least one second battery bank related to the first battery bank; and based on the voltage change in the second battery bank. The state of the first battery bank can be diagnosed.

According to one embodiment, the step of detecting a voltage change in a first battery bank among the plurality of battery banks includes determining that a voltage change has occurred in the first battery bank when the voltage change rate of the first battery bank is greater than a threshold value. can do.

According to one embodiment, the step of measuring the voltage of each of the plurality of battery banks of the battery module includes identifying a battery cell whose voltage change rate is more than a threshold value among the plurality of battery cells included in the plurality of battery banks, and the battery cell A battery bank including may be determined as the first battery bank.

According to one embodiment, the step of analyzing the voltage change of at least one second battery bank related to the first battery bank includes, when detecting a voltage change of the first battery bank, the arrangement of the plurality of previously stored battery banks. A voltage change in the at least one second battery bank adjacent to the first battery bank may be analyzed based on the order.

According to one embodiment, the step of analyzing a voltage change in at least one second battery bank related to the first battery bank includes: the first battery bank for which the voltage change is detected based on the arrangement order of the plurality of battery banks; is divided into a first group, and at least one battery bank in contact with the first group among the at least one second battery bank is divided into a second group, and the second group among the at least one second battery bank At least one battery bank in contact with can be divided into a third group, and voltage changes in the first group, the second group, and the third group can be sequentially analyzed.

According to one embodiment, the step of analyzing a voltage change in at least one second battery bank related to the first battery bank includes, when a voltage change in the first battery bank is detected, connecting the first battery bank to the first battery bank. By dividing into groups and at least one battery bank in contact with the first group into the second group, the voltage change of the second group can be analyzed.

According to one embodiment, the step of analyzing a voltage change in at least one second battery bank related to the first battery bank includes, when detecting a voltage change in the second group, at least one contacting the second group. The battery bank can be divided into the third group and the voltage change of the third group can be analyzed.

According to one embodiment, the step of diagnosing the state of the first battery bank based on the voltage change of the second battery bank includes detecting the voltage change of the third group by detecting the battery bank divided into the first group. 1 Thermal runaway of the battery bank can be diagnosed.

According to the battery management device and its operating method according to an embodiment disclosed in this document, thermal runaway of a battery bank can be diagnosed based on a voltage change phenomenon between adjacent battery banks within a battery pack.

1 is a diagram showing a battery pack according to an embodiment disclosed in this document.
Figure 2 is a block diagram showing the configuration of a battery management device according to an embodiment disclosed in this document.
Figure 3 is a diagram showing the arrangement of battery cells inside a battery module according to an embodiment described in this document.
FIG. 4 is a diagram showing the arrangement of a plurality of battery banks within a battery pack according to an embodiment disclosed in this document.
FIG. 5 is a diagram illustrating a method of analyzing a voltage change in a second battery bank of a controller according to an embodiment disclosed in this document.
Figure 6 is a flowchart showing a method of operating a battery management device according to an embodiment disclosed in this document.
Figure 7 is a block diagram showing the hardware configuration of a computing system implementing a battery management device according to an embodiment disclosed in this document.

Hereinafter, some embodiments disclosed in this document will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the embodiments disclosed in this document, if it is determined that detailed descriptions of related known configurations or functions impede understanding of the embodiments disclosed in this document, the detailed descriptions will be omitted.

In describing the components of the embodiment disclosed in this document, terms such as first, second, A, B, (a), (b), etc. 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. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the embodiments disclosed in this document belong. . Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings they have in the context of the related technology, and unless explicitly defined in this document, should not be interpreted in an idealized or overly formal sense. No.

1 is a diagram showing a battery pack according to an embodiment disclosed in this document.

Referring to FIG. 1, a battery pack 1000 according to an embodiment disclosed in this document may include a plurality of battery modules 100, a battery management device 200, and a relay 300.

In Figure 1, there is a single battery module 100, but depending on the embodiment, the battery module 100 may be comprised of a plurality.

The battery module 100 may supply power to a target device (not shown). To this end, the battery module 100 may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device that operates by receiving power from the battery pack 1000 including the battery module 100. For example, the target device may include an electric vehicle (EV). ) or an energy storage system (ESS), but is not limited thereto.

The battery module 100 may include a plurality of battery banks 110, 120, 130, and 140. Here, the battery bank can be defined as one serial line composed of a plurality of battery cells within the battery module 100. In FIG. 1, there are four battery banks 110, 120, 130, and 140, but the battery module 100 is not limited thereto, and the battery module 100 includes n battery banks (n is a natural number of 2 or more). It can be. Depending on the embodiment, the plurality of battery banks 110, 120, 130, and 140 may be electrically connected to each other to form a cell module assembly (CMA). Depending on the embodiment, a plurality of battery banks 110, 120, 130, and 140 may be connected in series to each other within the battery module 100.

The plurality of battery banks 110, 120, 130, and 140 may include a plurality of battery cells. A battery cell is the basic unit of a battery that can be used by charging and discharging electrical energy, including lithium-ion (Li-ion) batteries, lithium-ion polymer (Li-ion polymer) batteries, nickel cadmium (Ni-Cd) batteries, and nickel hydrogen ( It may be a Ni-MH) battery, but it is not limited thereto. Depending on the embodiment, a plurality of battery cells included in each of the plurality of battery banks 110, 120, 130, and 140 may be connected to each other in parallel.

Depending on the embodiment, a plurality of battery cells included in each of the plurality of battery banks 110, 120, 130, and 140 may be connected to each other in parallel. Additionally, the number of battery cells connected in parallel within the plurality of battery banks 110, 120, 130, and 140 may be the same.

A battery management system (BMS) 200 determines the lifespan of a plurality of battery banks 110, 120, 130, and 140 based on temperature and voltage data of the plurality of battery banks 110, 120, 130, and 140. (SOH, State of Health) can be predicted. The battery management device 200 removes noise from battery data of the plurality of battery banks 110, 120, 130, and 140, and configures the plurality of battery banks 110 for each battery temperature and charge/discharge rate based on the data from which the noise has been removed. , 120, 130, 140) lifespan (SOH) can be predicted.

The battery management device 200 may manage and/or control the status and/or operation of the battery module 100. For example, the battery management device 200 may manage and/or control the status and/or operation of the plurality of battery banks 110, 120, 130, and 140 included in the battery module 100. The battery management device 200 may manage charging and/or discharging of the battery module 100.

In addition, the battery management device 200 can monitor the voltage, current, temperature, etc. of the battery module 100 and/or the plurality of battery banks 110, 120, 130, and 140 included in the battery module 100. there is. Additionally, for monitoring by the battery management device, sensors or various measurement modules, not shown, may be additionally installed in the battery module 100, the charging/discharging path, or any other location in the battery module 100. The battery management device 200 may calculate parameters indicating the state of the battery module 100, such as SOC (State of Charge) or SOH, based on monitored measured values such as voltage, current, and temperature.

The battery management device 200 can control the operation of the relay 300. For example, the battery management device 200 may short-circuit the relay 300 to supply power to the target device. Additionally, the battery management device 200 may short-circuit the relay 300 when a charging device is connected to the battery pack 1000.

The battery management device 200 may calculate cell balancing times for each of the plurality of battery banks 110, 120, 130, and 140. Here, the cell balancing time may be defined as the time required to balance battery cells. For example, the battery management device 200 may calculate the cell balancing time based on the SOC, battery capacity, and balancing efficiency of each of the plurality of battery banks 110, 120, 130, and 140.

As the period of use or number of uses of the plurality of battery banks 110, 120, 130, and 140 increases, the capacity may decrease, internal resistance may increase, and various battery factors may change. The battery management device 200 may diagnose abnormalities within the plurality of battery banks 110, 120, 130, and 140 based on data on various factors that change as the batteries deteriorate.

Specifically, the battery management device 200 manages the internal functions of the plurality of battery banks 110, 120, 130, and 140 based on data on various factors that change as the plurality of battery banks 110, 120, 130, and 140 deteriorate. By determining the abnormal voltage, it is possible to determine whether an abnormal battery cell exists within the plurality of battery banks 110, 120, 130, and 140.

For example, the battery management device 200 determines the battery in which thermal runaway has occurred within the plurality of battery banks 110, 120, 130, and 140 based on the respective voltages of the plurality of battery banks 110, 120, 130, and 140. The presence or absence of a cell can be determined.

In the battery pack 1000 having a multi-parallel cell structure, when thermal runaway occurs in a battery cell of a specific battery bank, the battery bank closest to the specific battery bank may ignite next. This is because conduction and convection that enable heat dissipation are limited depending on the design method due to the structural characteristics of electric vehicles that require a large amount of battery cells to be densely placed in a limited space. Therefore, when a chain ignition occurs inside the battery pack 1000, the ignition proceeds in the order of battery banks that are closest to the battery bank including the trigger battery cell where the first thermal runaway phenomenon occurred.

If thermal runaway occurs inside the battery bank, voltage jitter occurs due to damage to the battery cells. The battery management device 200 may diagnose a battery bank in which thermal runaway has occurred based on voltage fluctuations due to thermal runaway of the battery bank and chain ignition characteristics within the battery pack. Specifically, the battery management device 200 may analyze the voltage change history of the battery banks and diagnose the battery bank in which thermal runaway inside the battery pack has occurred.

Below, the configuration and operation of the battery management device 200 will be described in detail.

Figure 2 is a block diagram showing the configuration of a battery management device according to an embodiment disclosed in this document.

First, referring to FIG. 2, the battery management device 200 may include a voltage measurement unit 210 and a controller 220.

The voltage measurement unit 210 may measure the voltage of each of a plurality of battery banks 110, 120, 130, and 140 in which a plurality of battery cells within the battery module 100 are connected in parallel to each other. Specifically, the voltage measurement unit 210 may repeatedly measure the voltage of each of the plurality of battery banks 110, 120, 130, and 140 at a specific cycle.

The controller 220 may detect a voltage change in the first battery bank B1, which is one of the plurality of battery banks 110, 120, 130, and 140. Here, the first battery bank (B1) refers to the battery bank in which an abnormal voltage occurred among the plurality of battery banks (110, 120, 130, 140). Hereinafter, the battery bank in which an abnormal voltage occurred is referred to as the first battery bank (B1). Let me explain.

If the voltage change rate of the first battery bank B1 is greater than or equal to a threshold value, the controller 220 may determine that a voltage change has occurred in the first battery bank B1. Specifically, the controller 220 may determine whether the open circuit voltage (OCV) of the first battery bank (B1) is in a relaxed state. Here, voltage relaxation occurs when a battery is in an idle or no-load state, a potential difference occurs between a plurality of anode materials, and the potential difference causes movement of operating ions between the anode materials, causing the potential difference to change over time. It means a phenomenon that is resolved according to . For example, if the voltage of the first battery bank (B1) is within 20 mv for 4 hours in an unloaded state, the controller 220 may determine the first battery bank (B1) to be in a voltage relaxation state. You can.

Depending on the embodiment, the controller 220 identifies battery cells whose voltage change rate is greater than or equal to a threshold value among the plurality of battery cells included in the plurality of battery banks 110, 120, 130, and 140, and selects a battery cell whose voltage change rate is equal to or greater than the threshold value. The battery bank including the cell may be determined as the first battery bank (B1).

After determining that the first battery bank (B1) is in a voltage relaxation state, the controller 220 controls the first battery bank (B1) when the voltage of the first battery bank (B1) is detected to fluctuate by a certain amount or more within a short period of time. It can be determined that an abnormal voltage has occurred. For example, if the voltage of the first battery bank B1 fluctuates by 100 mV for 1 second, the controller 220 may determine that an abnormal voltage has occurred in the first battery bank B1.

The controller 220 detects a voltage change in the first battery bank (B1) among the plurality of battery banks (110, 120, 130, and 140) and detects at least one second battery bank (B1) related to the first battery bank (B1). The state of the first battery bank (B1) can be diagnosed based on the voltage change of B2). Here, the second battery bank (B2) refers to at least one battery bank adjacent to the first battery bank (B1) based on the arrangement order of the plurality of previously stored battery banks (110, 120, 130, and 140). Hereinafter, at least one battery bank adjacent to the first battery bank (B1) will be described as the second battery bank (B2).

Figure 3 is a diagram showing the arrangement of a plurality of battery cells inside a battery module according to an embodiment described in this document.

Referring to FIG. 3, the battery module 100 according to one embodiment may be composed of ‘24S13P’ battery cells. That is, the battery module 100 may include a plurality of battery cells composed of 24 serial lines and 13 parallel lines. Here, each parallel line in which 13 battery cells are connected in parallel can be defined as a battery bank. Accordingly, the battery module 100 shown in FIG. 3 may be a battery bank in which 13 battery cells are connected in parallel to each other in series. That is, the battery module 100 may have 24 battery banks connected in series.

Although only one battery module 100 is shown in FIG. 3, the battery pack 1000 may be composed of a total of ‘96S13P’ battery cells in a stacked structure of four battery modules.

Referring to FIG. 3, for example, an abnormal voltage may occur in the ‘S16/P01’ battery cell inside the battery module 100. Here, 'S16' refers to the 16th battery bank from the left in a series line in which 24 battery banks are connected in series, and 'P01' refers to the 1st battery cell from the top in a battery bank in which 13 battery cells are connected in parallel. it means. In other words, the ‘S16/P01’ battery cell refers to the 1st battery cell from the top inside the 16th battery bank from the left inside the battery module 100.

The controller 200 monitors the voltage of a plurality of battery cells inside the battery module 100 and a plurality of battery banks in which the plurality of battery cells are connected in parallel to determine the battery bank including the battery cell in which an abnormal voltage has occurred. . Therefore, for example, if a thermal runaway phenomenon occurs in the 'S16/P01' battery cell inside the battery module 100 and a voltage change occurs, the controller 100 controls the battery bank containing the 'S16/P01' battery cell. The 'S16' battery bank can be detected, and it can be determined that the 'S16' battery bank contains a battery cell with an abnormal voltage.

FIG. 4 is a diagram showing the arrangement of a plurality of battery banks within a battery pack according to an embodiment disclosed in this document.

Referring to FIG. 4, the battery pack 1000 includes a first battery module 100-1, a second battery module 100-2, a third battery module 100-3, and a fourth battery module 100-4. ) may include. The battery pack 1000 has a stacked structure of the first battery module 100-1, the second battery module 100-2, the third battery module 100-3, and the fourth battery module 100-4. It can be formed. Here, each battery module may be composed of ‘24S13P’ battery cells. That is, each battery module may include 24 battery banks in which 13 battery cells are connected in parallel. Accordingly, the battery pack 1000 may include a total of 96 battery banks.

The controller 220 may detect a voltage change in the first battery bank B1, which is one of the plurality of battery banks included in the battery pack 1000. Referring to FIG. 4 , for example, when an abnormal voltage occurs in battery bank number 7 inside the first battery module 100-1, the controller 220 may detect a change in the voltage of battery bank number 7.

When the controller 220 detects a voltage change in the first battery bank B1, which is one of the plurality of battery banks included in the battery pack 1000, the first battery bank B1 is stored based on the previously stored arrangement order of the plurality of battery banks. A change in voltage of at least one second battery bank (B2) adjacent to the battery bank (B1) may be analyzed. For example, when the controller 220 detects a voltage change in battery bank 7 inside the first battery module 100-1, 5, 6, 8, 9, 40, 41 adjacent to battery bank 7, Voltage changes in battery banks 42, 43, 44, 53, 54, 55, 56, and 57 can be analyzed. That is, the controller 220 can analyze whether the detected voltage change phenomenon of a specific battery bank is gradually spreading to a plurality of adjacent battery banks.

FIG. 5 is a diagram illustrating a method of analyzing a voltage change in a second battery bank of a controller according to an embodiment disclosed in this document.

Referring to FIG. 5 , the controller 220 may divide the first battery bank B1 in which a voltage change is detected into a first group G1 based on the arrangement order of the plurality of battery banks. The controller 220 may divide at least one battery bank in contact with the first group (G1) into the second group (G2) based on the battery bank number of the first group (G1) and the previously stored battery bank arrangement order. .

When the controller 220 detects a voltage change in the first battery bank (B1), the controller 220 divides the first battery bank (B1) into a first group (G1) and at least one device in contact with the first group (G1) The battery bank can be divided into a second group (G2) and the voltage change of the second group (G2) can be analyzed. For example, the controller 220 may determine that an abnormal voltage has occurred in the second group G2 when the voltage value of the second group G2 is detected to fluctuate by a certain amount or more within a short period of time.

When the controller 220 detects a voltage change in the second group G2, the controller 220 may divide at least one battery bank in contact with the second group G2 into the third group G3. The controller may analyze the voltage change of the third group (G3). For example, the controller 220 may determine that an abnormal voltage has occurred in the third group G3 when the voltage value of the third group G3 is detected to fluctuate by a certain amount or more within a short period of time.

The controller 220 sequentially analyzes the voltage changes in the first group (G1), the second group (G2), and the third group (G3), and finally the first group (G1), the second group (G2), and Since abnormal voltages occur in all of the third group G3, it is possible to analyze whether the voltage change phenomenon is gradually spreading to a plurality of adjacent battery banks.

When detecting a voltage change in the third group (G3), the controller 220 can diagnose that a thermal runaway phenomenon has occurred in a battery cell inside the first battery bank (B1) divided into the first group (G1). .

When the controller 220 diagnoses that a thermal runaway phenomenon has occurred in a battery cell inside the first battery bank (B1), the controller 220 may turn off the operation of the relay 300. Additionally, when the controller 220 diagnoses that a thermal runaway phenomenon has occurred in a battery cell inside the first battery bank (B1), it may store a Diagnostic Trouble Code (DTC). Here, DTC stands for fault diagnosis code and is a code used to diagnose malfunctions in vehicles or heavy equipment. Additionally, the controller 220 may notify the driver of the vehicle on which the battery pack 1000 is mounted or a fire engine that thermal runaway has occurred.

As described above, the battery management device 200 according to an embodiment disclosed in this document may diagnose thermal runaway of a battery bank based on a voltage change phenomenon between adjacent battery banks within a battery pack.

Additionally, the battery management device 200 can diagnose thermal runaway inside a battery bank without being equipped with a temperature sensor, thereby solving the problem of the cost of the battery pack and the difficulty of providing a large number of temperature sensors in the production process.

Figure 6 is a diagram showing a method of operating a battery management device according to an embodiment disclosed in this document.

Hereinafter, a method of operating the battery management device 200 will be described with reference to FIGS. 1 to 5 .

Since the battery management device 200 may be substantially the same as the battery management device 200 described with reference to FIGS. 1 to 4, it will be briefly described below to avoid duplication of description.

Referring to FIG. 6, the method of operating the battery management device includes measuring the voltage of each of the plurality of battery banks of the battery module (S101) and detecting a voltage change in the first battery bank among the plurality of battery banks (S102). , Analyzing a voltage change in at least one second battery bank related to the first battery bank (S103) and diagnosing the state of the first battery bank based on the voltage change in the second battery bank (S104). can do.

In step S101, the voltage measurement unit 210 may measure the voltage of each of the plurality of battery banks 110, 120, 130, and 140 in which the plurality of battery cells inside the battery module 100 are connected in parallel to each other. In step S101, the voltage measurement unit 210 may repeatedly measure the voltage of each of the plurality of battery banks 110, 120, 130, and 140 at a specific cycle.

In step S102, the controller 220 may detect a voltage change in the first battery bank B1, which is one of the plurality of battery banks 110, 120, 130, and 140. Here, the first battery bank (B1) refers to the battery bank in which an abnormal voltage occurred among the plurality of battery banks (110, 120, 130, 140). Hereinafter, the battery bank in which an abnormal voltage occurred is referred to as the first battery bank (B1). Let me explain.

In step S102, the controller 220 may determine that a voltage change has occurred in the first battery bank B1 when the voltage change rate of the first battery bank B1 is greater than or equal to a threshold value. In step S102, specifically, the controller 220 may determine whether the open circuit voltage of the first battery bank B1 is in a relaxed state. Here, voltage relaxation occurs when a battery is in an idle or unloaded state, a potential difference occurs between a plurality of anode materials, and the potential difference causes movement of operating ions between the anode materials, causing the potential difference to resolve over time. It means phenomenon. In step S102, for example, if the voltage of the first battery bank (B1) is within 20 mv for 4 hours in an unloaded state, the controller 220 relaxes the voltage of the first battery bank (B1). It can be judged by the condition.

In step S102, depending on the embodiment, the controller 220 identifies a battery cell whose voltage change rate is more than a threshold value among the plurality of battery cells included in the plurality of battery banks 110, 120, 130, and 140, and the voltage change rate is A battery bank including battery cells exceeding a threshold value may be determined as the first battery bank B1.

In step S102, the controller 220 determines that the first battery bank (B1) is in a voltage relaxation state, and then, when the voltage of the first battery bank (B1) is detected to fluctuate by a certain amount or more within a short period of time, the first battery bank (B1) is It can be determined that an abnormal voltage has occurred in (B1). In step S102, for example, when the voltage of the first battery bank (B1) fluctuates by 100 mV for 1 second, the controller 220 determines that an abnormal voltage has occurred in the first battery bank (B1). You can.

In step S103, the controller 220 may analyze the voltage change of at least one second battery bank related to the first battery bank. In step S103, the controller 220 detects a voltage change in the first battery bank (B1) among the plurality of battery banks (110, 120, 130, and 140) and detects at least one battery bank (B1) related to the first battery bank (B1). 2 The state of the first battery bank (B1) can be diagnosed based on the voltage change of the battery bank (B2). Here, the second battery bank (B2) refers to at least one battery bank adjacent to the first battery bank (B1) based on the arrangement order of a plurality of previously stored battery banks. Hereinafter, at least one battery bank adjacent to the first battery bank (B1) will be described as the second battery bank (B2).

In step S103, the controller 220 may analyze the voltage change of at least one second battery bank (B2) adjacent to the first battery bank (B1) based on the previously stored arrangement order of the plurality of battery banks.

In step S103, the controller 220 may classify the first battery bank (B1) in which a voltage change is detected into the first group (G1) based on the arrangement order of the plurality of battery banks. In step S103, the controller 220 transfers at least one battery bank in contact with the first group (G1) to the second group (G2) based on the battery bank number of the first group (G1) and the previously stored battery bank arrangement order. It can be divided into:

In step S103, when the controller 220 detects a voltage change in the first battery bank (B1), the controller 220 divides the first battery bank (B1) into a first group (G1) and contacts the first group (G1). At least one battery bank can be divided into a second group (G2) and the voltage change of the second group (G2) can be analyzed. In step S103, for example, the controller 220 may determine that an abnormal voltage has occurred in the second group (G2) when the voltage value of the second group (G2) is detected to fluctuate by a certain amount or more within a short period of time. there is.

In step S103, when the controller 220 detects a voltage change in the second group G2, the controller 220 may distinguish at least one battery bank in contact with the second group G2 into the third group G3. In step S103, the controller may analyze the voltage change of the third group (G3). In step S103, for example, the controller 220 may determine that an abnormal voltage has occurred in the third group (G3) when the voltage value of the third group (G3) is detected to fluctuate by a certain amount or more within a short period of time. there is.

In step S104, the controller 220 sequentially analyzes the voltage changes in the first group (G1), the second group (G2), and the third group (G3), and finally determines the first group (G1) and the second group (G3). Since abnormal voltages occur in both (G2) and the third group (G3), it is possible to analyze whether the voltage change phenomenon is gradually spreading to a plurality of adjacent battery banks.

In step S104, when the controller 220 detects a voltage change in the third group (G3), the controller 220 determines that a thermal runaway phenomenon has occurred in the battery cell inside the first battery bank (B1) divided into the first group (G1). It can be diagnosed.

In step S104, when the controller 220 diagnoses that a thermal runaway phenomenon has occurred in a battery cell inside the first battery bank B1, the controller 220 may turn off the operation of the relay 300. In step S104, if the controller 220 diagnoses that a thermal runaway phenomenon has occurred in a battery cell inside the first battery bank B1, it may store a diagnostic trouble code (DTC). In step S104, the controller 220 may also notify the driver of the vehicle on which the battery pack 1000 is mounted or a fire engine that thermal runaway has occurred.

Figure 7 is a block diagram showing the hardware configuration of a computing system implementing a battery management device according to an embodiment disclosed in this document.

Referring to FIG. 7, the computing system 2000 according to an embodiment disclosed in this document may include an MCU 2100, a memory 2200, an input/output I/F 2300, and a communication I/F 2400. there is.

The MCU 2100 executes various programs (for example, a battery bank voltage analysis program) stored in the memory 2200, processes various data through these programs, and operates the battery management device 200 shown in FIG. 1 described above. ) may be a processor that performs the functions of.

The memory 2200 can store various programs related to the operation of the facility control device 200. Additionally, the memory 2200 may store operating data of the facility control device 200.

A plurality of such memories 2200 may be provided as needed. The memory 2200 may be a volatile memory or a non-volatile memory. The memory 2200 as a volatile memory may use RAM, DRAM, SRAM, etc. The memory 2200 as a non-volatile memory may be ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of memories 2200 listed above are merely examples and are not limited to these examples.

The input/output I/F 2300 is an interface that connects input devices such as a keyboard, mouse, and touch panel (not shown) and output devices such as a display (not shown) and the MCU 2100 to transmit and receive data. can be provided.

The communication I/F 2400 is a component that can transmit and receive various data with a server, and may be various devices that can support wired or wireless communication. For example, programs or various data for resistance measurement and abnormality diagnosis can be transmitted and received from a separately provided external server through the communication I/F 2400.

The above description is merely an illustrative explanation of the technical idea of the present disclosure, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present disclosure.

Accordingly, the embodiments disclosed in the present disclosure are not intended to limit the technical idea of the present disclosure but are for illustrative purposes, and the scope of the technical idea of the present disclosure is not limited by these embodiments. The scope of protection of this disclosure should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of this disclosure.

1000: Battery pack
100: Battery module
100-1: first battery module
100-2: Second battery module
100-3: Third battery module
100-4: Fourth battery module
110: first battery bank
120: second battery bank
130: Third battery bank
140: fourth battery bank
200: Battery management device
210: Voltage measurement unit
220: controller
300: relay
2000: Computing Systems
2100:MCU
2200: Memory
2300: Input/output I/F
2400: Communication I/F
B1: first battery bank
B2: Second battery bank
G1: Group 1
G2: Second group
G3: Third group

Claims (16)

A voltage measuring unit that measures the voltage of each of the plurality of battery banks of the battery module; and
Includes a controller that detects a voltage change in a first battery bank among the plurality of battery banks and diagnoses the state of the first battery bank based on a voltage change in at least one second battery bank related to the first battery bank. A battery management device that does.
According to claim 1,
The controller determines that a voltage change has occurred in the first battery bank when the voltage change rate of the first battery bank is greater than or equal to a threshold value.
According to claim 1,
The plurality of battery banks include a plurality of battery cells, and the controller identifies a battery cell whose voltage change rate is greater than a threshold value among the plurality of battery cells, and selects the battery bank including the battery cells as the first battery bank. A battery management device characterized by determining.
According to claim 1,
When the controller detects a voltage change in the first battery bank, the controller analyzes the voltage change in the at least one second battery bank adjacent to the first battery bank based on a pre-stored arrangement order of the plurality of battery banks. A battery management device characterized in that.
According to clause 4,
The controller divides the first battery bank in which the voltage change is detected into a first group based on the arrangement order of the plurality of battery banks, and at least one of the at least one second battery bank contacting the first group One battery bank is divided into a second group, and at least one battery bank in contact with the second group among the at least one second battery bank is divided into a third group, and the first group and the second group and sequentially analyzing voltage changes of the third group.
According to clause 5,
When the controller detects a voltage change in the first battery bank, the controller divides the first battery bank into the first group and divides at least one battery bank in contact with the first group into the second group. A battery management device characterized in that the voltage change of the second group is analyzed.
According to clause 6,
When the controller detects a voltage change in the second group, the controller divides at least one battery bank in contact with the second group into the third group and analyzes the voltage change in the third group. Management device.
According to clause 7,
The battery management device, wherein the controller diagnoses thermal runaway of the first battery bank divided into the first group when detecting a voltage change in the third group.
Measuring the voltage of each of the plurality of battery banks of the battery module;
detecting a voltage change in a first battery bank among the plurality of battery banks;
analyzing voltage changes in at least one second battery bank associated with the first battery bank; and
A method of operating a battery management device comprising diagnosing a state of the first battery bank based on a change in voltage of the second battery bank.
According to clause 9,
The step of detecting a voltage change in a first battery bank among the plurality of battery banks includes determining that a voltage change has occurred in the first battery bank when the voltage change rate of the first battery bank is greater than a threshold value. How the managed device works.
According to clause 9,
The step of measuring the voltage of each of the plurality of battery banks of the battery module includes identifying a battery cell whose voltage change rate is greater than a threshold value among the plurality of battery cells included in the plurality of battery banks, and determining the battery bank including the battery cell. A method of operating a battery management device, characterized in that determining the first battery bank.
According to clause 9,
The step of analyzing a voltage change in at least one second battery bank related to the first battery bank includes, when detecting a voltage change in the first battery bank, the first battery bank based on a pre-stored arrangement order of the plurality of battery banks. 1. A method of operating a battery management device, characterized in that analyzing a change in voltage of the at least one second battery bank adjacent to the battery bank.
According to claim 12,
The step of analyzing the voltage change of at least one second battery bank related to the first battery bank includes dividing the first battery bank for which the voltage change is detected into a first group based on the arrangement order of the plurality of battery banks. And, at least one battery bank in contact with the first group among the at least one second battery bank is divided into a second group, and at least one battery bank in contact with the second group among the at least one second battery bank is divided into a second group. A method of operating a battery management device, comprising dividing battery banks into third groups and sequentially analyzing voltage changes in the first group, the second group, and the third group.
According to claim 13,
The step of analyzing a voltage change in at least one second battery bank related to the first battery bank includes, when a voltage change in the first battery bank is detected, dividing the first battery bank into the first group, and A method of operating a battery management device, characterized in that at least one battery bank in contact with the first group is divided into the second group and the voltage change of the second group is analyzed.
According to claim 14,
The step of analyzing a voltage change in at least one second battery bank related to the first battery bank includes, when detecting a voltage change in the second group, connecting at least one battery bank in contact with the second group to the third battery bank. A method of operating a battery management device, characterized in that it is divided into groups and the voltage change of the third group is analyzed.
According to claim 15,
The step of diagnosing the state of the first battery bank based on the voltage change of the second battery bank includes, when detecting the voltage change of the third group, thermal runaway of the first battery bank divided into the first group. A method of operating a battery management device, characterized in that diagnosing.

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