KR20240022810A - Operating method of a battery management system - Google Patents

Abstract

A method of operating a battery management system according to an embodiment of the present invention includes measuring a standby time before starting to charge a battery, the state of charge (SOC) of the battery is less than or equal to a standard SOC, and the standby time is If it is longer than a predetermined threshold time, executing a first charging operation to charge the battery at a first C-Rate, and if the SOC of the battery reaches the reference SOC by the first charging operation, the first C-Rate and performing a second charging operation of charging the battery with a second C-Rate greater than the C-Rate, where the second C-Rate is 5 times or more than the first C-Rate.

Description

Operating method of a battery management system {OPERATING METHOD OF A BATTERY MANAGEMENT SYSTEM}

The present invention relates to a method of operating a battery management system.

An electric vehicle is a means of transportation that runs using electrical energy output from a battery as power. The battery mounted on an electric vehicle is charged by receiving power from a charger at a charging station, etc., and may be discharged while driving. Therefore, batteries mounted in electric vehicles are repeatedly charged and discharged in various environments, and the charging and discharging operations of the battery can affect the lifespan and stability of the battery. In general, electric vehicles support fast charging so that they can quickly charge the battery and start driving again. However, if fast charging is applied uniformly without considering the condition of the battery, etc., it may have a negative impact on the life and stability of the battery. there is.

One of the problems to be solved by the present invention is to adaptively control the charging speed of the battery mounted on an electric vehicle by considering the battery's SOC (State of Charge), the waiting time before starting charging the battery, etc. The goal is to provide a method of operating a battery management system that can improve battery life and stability.

A method of operating a battery management system according to an embodiment of the present invention includes measuring a standby time before starting to charge a battery, the state of charge (SOC) of the battery is less than or equal to a standard SOC, and the standby time is If it is longer than a predetermined threshold time, executing a first charging operation to charge the battery at a first C-Rate, and if the SOC of the battery reaches the reference SOC by the first charging operation, the first C-Rate and performing a second charging operation of charging the battery with a second C-Rate greater than the C-Rate, where the second C-Rate is 5 times or more than the first C-Rate.

A method of operating a battery management system according to an embodiment of the present invention includes measuring the SOC of the battery before an electric vehicle equipped with a battery enters a charging station and charging of the battery begins, and the SOC of the battery is Performing a first charging operation of charging the battery at a first C-Rate if the SOC is below the standard SOC; if the SOC of the battery reaches the standard SOC, charging the battery for a rest time of 30 seconds or more and 10 minutes or less. It includes stopping charging, and performing a second charging operation of charging the battery at a second C-Rate that is greater than the first C-Rate when the idle time elapses.

According to a method of operating a battery management system according to the technical idea of the present invention, the charging rate for the battery based on at least one of the waiting time before the battery enters the charging station and is connected to the charger, and the SOC of the battery before starting charging. can be controlled. By controlling the charging speed of the battery according to standby time, SOC, etc., and providing a predetermined rest time during charging when necessary, lithium is prevented from precipitation in the overhang area of the cathode included in the battery, and the battery life is maintained. and stability can be improved.

The various and beneficial advantages and effects of the present invention are not limited to the above-described content, and may be more easily understood through description of specific embodiments of the present invention.

1 and 2 are diagrams for explaining the operation of the battery management system according to the congestion level of the charging station in one embodiment of the present invention.
Figure 3 is a block diagram simply showing a battery system including a battery management system according to an embodiment of the present invention.
Figure 4 is a diagram showing a partial structure of a battery whose operation is controlled by a battery management system according to an embodiment of the present invention.
Figure 5 is a flowchart provided to explain a method of operating a battery management system according to an embodiment of the present invention.
Figure 6 is a flowchart provided to explain a method of operating a battery management system according to an embodiment of the present invention.
7 to 10 are diagrams provided to explain a method of operating a battery management system according to an embodiment of the present invention.

Specific details of other embodiments are included in the detailed description and drawings.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals may refer to the same elements throughout the specification.

1 and 2 are diagrams for explaining the operation of a battery management system according to the congestion level of a charging station in an embodiment of the present invention.

1 and 2, the charging station 10 may include a plurality of chargers 11-14. Each of the plurality of chargers 11-14 outputs power that can charge an electric vehicle, and, for example, may be installed separately from each other in the space provided by the charging station 10. A parking space where an electric vehicle can be parked may be provided adjacent to each of the plurality of chargers 11-14. When the charging plug of one of the plurality of chargers 11-14 is connected to the charging terminal of the electric vehicle that has entered the parking space and stopped, charging of the battery mounted on the electric vehicle may begin.

FIG. 1 may be a diagram illustrating a situation in which the charging station 10 is not highly crowded. As shown in FIG. 1, in a situation where congestion is not high, at least some of the plurality of chargers 11-14 provided in the charging station 10 may not be in use. In one embodiment shown in FIG. 1, only the first charger 11 and the fourth charger 14 are in use, and the second charger 12 and the third charger 13 may be empty. The first charger 11 can charge the battery of the first electric vehicle 21, and the fourth charger 14 can charge the battery of the fourth electric vehicle 24.

Referring to FIG. 1, each of the second electric vehicle 22 and the third electric vehicle 23 that want to use the second charger 22 and the third charger 23 that are not in use can enter the charging station 10. there is. Since the second charger 22 and the third charger 23 are not in use at the time the second electric vehicle 22 and the third electric vehicle 23 enter the charging station 10, the second electric vehicle 22 and the third electric vehicle 23 are present without any waiting time. Each of the second electric vehicle 22 and the third electric vehicle 23 can immediately start charging the battery.

On the other hand, FIG. 2 may be a diagram showing a situation in which the congestion level of the charging station 10 is relatively high. In one embodiment shown in FIG. 2, while the first to fourth chargers 11-14 are occupied by the first to fourth electric vehicles 21-24, other electric vehicles wishing to charge their batteries (31-36) can wait at the charging station (10). Accordingly, the electric vehicles 31 - 36 may not be able to start charging immediately after arriving at the charging station 10 and may have to wait for a predetermined waiting time.

As explained with reference to FIGS. 1 and 2 , depending on the difference in the congestion level of the charging station 10, whether the battery of the electric vehicle is charged immediately after the electric vehicle stops driving or after a predetermined waiting time has elapsed after the electric vehicle stops driving. Afterwards, it can be determined whether the battery of the electric vehicle is charged. The presence or absence of such a standby time and the length of the standby time may affect the lifespan and stability of the battery mounted in an electric vehicle. In one embodiment of the present invention, by installing a battery management system that adaptively controls charging of the battery in an electric vehicle, the lifespan and stability of the battery can be secured regardless of standby time.

For example, a battery mounted on an electric vehicle includes a battery case, an anode and a cathode exposed to the outside of the battery case, and the battery case may be filled with an electrolyte. The anode and cathode of the battery are separated from each other by a separator within the battery case, and the anode and cathode may have different areas. For example, in a battery, the cathode may have a larger area than the anode, and thus the cathode may include an area that does not face the anode. The area of the cathode that does not face the anode can be defined as an overhang area.

In a situation where the waiting time for an electric vehicle is long due to high congestion at the charging station 10, if rapid charging of the battery of the electric vehicle begins immediately, lithium may precipitate in the overhang area. If lithium precipitates into the overhang area, the lifespan of the battery may be reduced and the stability of the battery may also deteriorate. Therefore, in one embodiment of the present invention, the battery management system mounted on an electric vehicle can measure the waiting time before charging, and according to the waiting time, start charging the battery at a low C-Rate to prevent lithium precipitation in the overhang area, etc. It can be prevented.

Additionally, in one embodiment of the present invention, the battery management system may monitor the state of charge (SOC) of the battery before charging along with the waiting time before charging. The battery management system may initiate charging with a current amount lower than that supplied to the battery in a fast charging operation if the SOC of the battery before charging is less than or equal to a predetermined reference SOC and the standby time is longer than a predetermined threshold time. For example, if the SOC of the battery is below a predetermined standard SOC, the battery management system starts charging at the first C-Rate, and when the SOC of the battery reaches the standard SOC, the battery management system starts charging at a second C-Rate higher than the first C-Rate. You can proceed with charging. The second C-Rate may be greater than the first C-Rate, for example, 5 times or more, and the operation of charging the battery at the second C-Rate may be defined as fast charging.

Figure 3 is a block diagram simply showing a battery system including a battery management system according to an embodiment of the present invention.

Referring to FIG. 3 , the battery system 100 may include a battery pack 110 and a battery management system 120. The battery pack 110 includes a plurality of battery modules 111. For example, each of the battery modules 111 may include a plurality of battery cells.

As described above, each of the plurality of battery cells may include an anode, a cathode, and a battery case filled with an electrolyte. In order to prevent lithium from precipitating or forming lithium dendrites in the area adjacent to the edge of the negative electrode during the charging operation of the battery pack 110, the negative electrode may have a larger area than the positive electrode, and the negative electrode may have a larger area than the positive electrode, and the negative electrode may have a larger area than the positive electrode. The area can be defined as an overhang area.

However, lithium may also precipitate in the overhang area of the cathode. For example, when charging is started at a high C-Rate while the SOC of the battery pack 110 is low, or when the battery pack 110 is charged after being left for a predetermined standby time, lithium may precipitate in the overhang area. You can.

To solve the above problem, the battery management system 120 may monitor standby time, SOC, etc. before starting charging the battery pack 110. Referring to FIG. 3, the battery management system 120 may include a voltage measurement unit 121, an SOC measurement unit 122, and a charging control unit 123. The voltage measurement unit 121 can measure the open circuit voltage (OCV), etc. from the battery pack 110, and the SOC measurement unit 122 can measure the open circuit voltage, etc. measured by the voltage measurement unit 121. Based on this, the SOC of the battery pack 110 can be determined. Depending on the embodiment, the SOC measurement unit 122 may determine the SOC using each of the plurality of battery modules 111 or battery cells as a unit.

The charging control unit 123 may control the charging operation for the battery pack 110 based on the SOC of the battery pack 110 determined by the SOC measurement unit 122 and/or the waiting time before starting charging. . For example, if the SOC measured before starting charging of the battery pack 110 is less than or equal to a predetermined standard SOC, the charging control unit 123 performs a first charging operation of charging the battery pack 110 at the first C-Rate. It can be run. When the SOC of the battery pack 110 reaches a predetermined reference SOC through the first charging operation, the charging control unit 123 performs a second charging operation to charge the battery pack 110 at a second C-Rate that is greater than the first C-Rate. 2 Charging operation can be performed.

The first C-Rate is smaller than the second C-Rate, and depending on the embodiment, the second C-Rate may be 5 times or more than the first C-Rate. The second charging operation of charging the battery pack 110 at the second C-Rate may be fast charging. For example, the second C-Rate may be 2.75C.

In one embodiment, the first C-Rate may be 1/3*C, and therefore the first charging operation may not be fast charging. If the SOC of the battery pack 110 is determined to be lower than the standard SOC at the time of starting charging, even if fast charging is selected by the driver of the electric vehicle or the manager of the charging station, the battery management system 120 The first charging operation of charging the battery pack 110 at -Rate may be performed first. This may be to ensure the lifespan and stability of the battery pack 110.

Meanwhile, if the SOC of the battery pack 110 is higher than the reference SOC, the battery management system 120 may immediately perform the second charging operation without the first charging operation. In other words, if the SOC of the battery pack 110 is higher than the standard SOC at the time of starting charging, the battery management system 120 can immediately perform fast charging to charge the battery pack 110 at the second C-Rate. there is.

Additionally, depending on the embodiment, the battery management system 120 may control the charging operation of the battery pack 110 by considering the waiting time until charging begins in addition to the SOC of the battery pack 110. For example, when the SOC of the battery pack 110 is lower than the reference SOC and the waiting time to start charging is longer than a predetermined threshold time, the battery management system 120 performs the first charging operation and the second charging operation in order. You can run it as you like. In one embodiment, the baseline SOC may be 30% and the threshold time may be 20 minutes.

Additionally, the battery management system 120 may provide a predetermined rest time between the first charging operation and the second charging operation. The rest time is set shorter as the SOC of the battery pack 110 at the start of charging is lower, and can be set to not exceed 10 minutes at the most. Additionally, the battery management system 120 may set a rest time of at least 30 seconds between the first charging operation and the second charging operation. The break time may be defined as the time during which charging of the battery pack 110 is stopped by requesting the charger from the battery management system 120.

Figure 4 is a diagram showing a partial structure of a battery whose operation is controlled by a battery management system according to an embodiment of the present invention.

Referring to FIG. 4 , the battery 200 according to an embodiment of the present invention includes a cathode 210 and an anode 220, and the cathode 210 may have a larger area than the anode 220. The cathode 210 and the anode 220 are alternately arranged and covered by a battery case, and the battery case may be filled with an electrolyte. Although not shown in FIG. 4, a separator may be disposed between the cathode 210 and the anode 220 that are adjacent to each other.

As shown in FIG. 4 , the cathode 210 extends longer than the anode 220 in at least one direction and may have an overhang area 215 that does not face the anode 220 . The length L1 of the overhang area 215 may vary depending on the embodiment, and in one embodiment shown in FIG. 4, the cathode 210 is shown as having overhang areas 215 on both sides of the anode 220. It is not necessarily limited to this form.

For example, the cathode 210 and the anode 220 may have a plate shape. In this case, the cathode 210 may have an overhang area 215 adjacent to each of the four corners of the plate shape.

As described above, the overhang area 215 may be formed for the purpose of preventing lithium precipitation and lithium dendrite formation in the area adjacent to the edge of the cathode 210. However, when rapid charging is performed immediately when the SOC of the battery 200 is low, or when rapid charging is performed immediately when the battery 200 is left for a long waiting time before starting charging, the overhang area 215 Lithium may precipitate. As lithium precipitates in the overhang area 215, the lifespan and/or stability of the battery 200 may be reduced.

In one embodiment of the present invention, in order to minimize lithium precipitation, the battery management system may adaptively control the charging operation of the battery 200. For example, when charging begins with the SOC of the battery 200 being low, even if rapid charging is commanded by the user, the battery 200 is charged at a low C-Rate to charge the battery 200 up to a predetermined standard SOC. After increasing the SOC, rapid charging of the battery 200 can begin. Additionally, if a long standby time has elapsed before charging the battery 200, the battery 200 can be charged first at a low C-Rate even if rapid charging is commanded.

In this way, even when rapid charging of the battery 200 is ordered in consideration of the SOC and waiting time of the battery 200 before starting charging, charging at a low C-Rate can be performed first, and from there, the overhang area 215 Lithium precipitation can be suppressed. Additionally, depending on the embodiment, lithium precipitation can be minimized by providing a short pause time to stop charging the battery 200 between charging at a low C-Rate and rapid charging.

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

Referring to FIG. 5, the method of operating the battery management system according to an embodiment of the present invention may begin with the battery management system measuring the standby time before starting charging (S10). For example, the standby time may be a time in which the battery managed by the battery management system is not discharged due to driving of the electric vehicle or charging from a charger connected to the electric vehicle is not performed. In other words, standby time can be defined as the time the battery is left unattended.

Additionally, the battery management system can measure the SOC of the battery before charging begins (S11). The SOC of a battery is a parameter that indicates the state of charge of the battery and can be defined as a value of 100% or less. However, depending on the embodiment, the lower limit of the SOC of the battery may be set greater than 0% to ensure stable use of the battery.

When the electric vehicle is connected to the charger and the battery management system receives a command to start charging, the battery management system may first determine whether the waiting time measured in step S10 exceeds the threshold time (S12). For example, the critical time may be 20 minutes. In step S12, if it is determined that the waiting time is less than the threshold time, that is, if it is determined that the electric vehicle is directly connected to the charger without a particularly long waiting time and charging of the battery has begun, the battery management system may execute a second charging operation. (S16). For example, the second charging operation may be fast charging, which quickly charges the battery at a high C-Rate.

On the other hand, if it is determined that the standby time exceeds the threshold time in step S12, the battery management system may determine whether the SOC of the battery measured in step S11 is less than or equal to the standard SOC (S13). For example, the standard SOC may be 30%. In step S13, if it is determined that the SOC of the battery exceeds the reference SOC, the battery management system may immediately perform the second charging operation (S16). In other words, if the battery's SOC is higher than the standard SOC at the time of starting charging, fast charging can be performed immediately regardless of whether the standby time exceeds the threshold time.

On the other hand, if the SOC of the battery is below the reference SOC in step S13, the battery management system may perform a first charging operation to charge the battery at a relatively low C-Rate (S14). This may be to prevent lithium from being deposited on the battery's cathode, thereby ensuring the life and stability of the battery. Even if the user selects to start fast charging, if the SOC of the battery is below the reference SOC, the battery management system may perform the first charging operation first.

While executing the first charging operation, the battery management system may monitor whether the SOC of the battery reaches the reference SOC (S15). When the SOC of the battery reaches the reference SOC through the first charging operation, the battery management system can increase the C-Rate and perform the second charging operation (S16). For example, the battery management system may instruct the charger to increase the C-Rate to start fast charging when the SOC of the battery reaches the reference SOC after the first charging operation is started, and the second charging operation will be executed accordingly. You can.

Figure 6 is a flowchart provided to explain a method of operating a battery management system according to an embodiment of the present invention.

Referring to FIG. 6, the method of operating the battery management system according to an embodiment of the present invention may begin with the battery management system measuring the SOC of the battery before starting charging (S20). For example, the battery management system may measure the open circuit voltage of the battery and measure the SOC of the battery by referring to a pre-stored look-up table. However, the method of measuring the SOC of a battery is not limited as above and may be modified in various ways.

When the electric vehicle that has entered the charging station is connected to the charger and the battery management system receives a command to start charging, the battery management system can first determine whether the SOC of the battery measured in step S12 is below the standard SOC (S21 ). For example, the standard SOC may be 30%. In step S21, if it is determined that the SOC of the battery exceeds the reference SOC, the battery management system may immediately perform the second charging operation (S25). If the SOC of the battery is higher than the standard SOC at the time of starting charging, the battery management system can request the charger to immediately perform fast charging.

On the other hand, if it is determined that the SOC of the battery exceeds the reference SOC in step S21, the battery management system may perform a first charging operation to charge the battery at a low C-Rate (S22). In this way, when charging begins with the SOC of the battery being low, the first charging operation of charging the battery at a low C-Rate may be performed first regardless of whether the user selects fast charging.

While the first charging operation is in progress, the battery management system may determine whether the SOC of the battery reaches the reference SOC. When the SOC of the battery increases due to the first charging operation and reaches the reference SOC, the battery management system may command the charger to stop charging the battery for a predetermined pause time (S24). The pause time is set to 30 seconds or more and 10 minutes or less. For example, the lower the SOC of the battery measured in step S20, the shorter the pause time can be set.

The battery management system sets the pause time in conjunction with the battery SOC measured in step S20, but can set the pause time as short as possible. By setting the rest time in this way, lithium precipitation occurring in the overhang area of the cathode can be effectively suppressed.

If it is determined that the idle time has elapsed, the battery management system may request the charger to begin charging again. After the pause time has elapsed, the battery management system may request the charger to perform a second charging operation that charges the battery at a higher C-Rate than the first charging operation (S25). As previously described, the second charging operation may be fast charging.

This may be to ensure the lifespan and stability of the battery by preventing lithium from being deposited on the battery's negative electrode. Even if the user selects to start fast charging, if the SOC of the battery is below the reference SOC, the battery management system may perform the first charging operation first.

While executing the first charging operation, the battery management system may monitor whether the SOC of the battery reaches the reference SOC (S15). When the SOC of the battery reaches the reference SOC through the first charging operation, the battery management system can increase the C-Rate and perform the second charging operation (S16). For example, the battery management system may instruct the charger to increase the C-Rate to start fast charging when the SOC of the battery reaches the reference SOC after the first charging operation is started, and the second charging operation will be executed accordingly. You can.

7 to 10 are diagrams provided to explain a method of operating a battery management system according to an embodiment of the present invention.

First, FIGS. 7 and 8 may be graphs showing the C-Rate supplied by a charger connected to an electric vehicle according to the SOC of the battery. First, FIG. 7 may be a graph to explain a charging operation when the SOC of the battery measured before charging the battery is higher than the reference SOC. Referring to FIG. 7, when the SOC of the battery measured before charging of the battery begins is higher than the reference SOC, rapid charging of the battery may begin immediately. In one embodiment shown in FIG. 7, while fast charging is in progress, the charger can charge the battery at a C-Rate of 2.75C.

On the other hand, FIG. 8 may be a graph to explain the charging operation when the SOC of the battery measured before charging the battery is less than or equal to the standard SOC. Referring to FIG. 8, when the SOC of the battery measured before charging of the battery begins is below the standard SOC, an operation of charging the battery at a low C-Rate may be performed first before rapid charging of the battery.

If the SOC of the battery measured before charging is below the standard SOC, the battery management system may instruct the charger to charge the battery at a C-Rate lower than the C-Rate applied for fast charging. Referring to FIG. 8, the charger can charge the battery at a C-Rate of 1/3*C until the SOC of the battery reaches the reference SOC (SOC _REF ).

The battery management system monitors the battery's SOC while it is charging and can command the charger to switch to fast charging when the battery's SOC reaches a reference SOC (SOC _REF ). The charger that receives the command from the battery management system can proceed with rapid charging by increasing the C-Rate. In this way, in one embodiment of the present invention, the charging operation can be adaptively controlled based on the SOC of the battery measured before the start of charging, thereby effectively suppressing lithium precipitation from the cathode due to rapid charging.

Next, FIGS. 9 and 10 may be graphs showing the C-Rate supplied by a charger connected to an electric vehicle over time. For example, in the embodiments described with reference to FIGS. 9 and 10, the results of comparison between the SOC measured from the battery and the reference SOC before starting to charge the battery, and the results of the comparison of the SOC and the reference SOC when the battery is left unattended before starting to charge the battery The C-Rate supplied by the charger may vary depending on the comparison result between the standby time and the critical time.

First, FIG. 9 may be a graph to explain a charging operation when the SOC of the battery measured before charging the battery is greater than the reference SOC and the waiting time the battery is left unattended before charging is shorter than the critical time. Referring to FIG. 9, if the SOC of the battery is greater than the reference SOC and the standby time is shorter than the threshold time, rapid charging of the battery may begin immediately. In one embodiment shown in FIG. 9, while fast charging is in progress, the charger can charge the battery at a C-Rate of 2.75C. For example, in one embodiment described with reference to FIG. 9, the battery management system may request the charger to charge the battery with fast charging even if the user does not select fast charging.

On the other hand, FIG. 10 may be a graph to explain a charging operation when the SOC of the battery measured before charging the battery is less than or equal to the standard SOC and the standby time of the battery is longer than the critical time. Referring to FIG. 10, prior to rapid charging of the battery, an operation of charging the battery at a low C-Rate may be performed first. For example, in one embodiment described with reference to FIG. 9 , the battery management system may request the charger to charge the battery at a slow rate even when the user selects fast charging.

Referring to FIG. 10, the charger can charge the battery at a C-Rate of 1/3*C until the first time point (T1). For example, the first time point (T1) may be a time when the SOC of the battery reaches a predetermined standard SOC as the battery is charged. When the first time point (T1) arrives, the battery management system may request the charger to stop charging so that a predetermined rest time (T _REST ) is given to the battery. In other words, during the rest time (T _REST ) the charger stops charging the battery, so the battery can be left unattended.

The rest time (T _REST ) can be determined in conjunction with the SOC and standby time of the battery measured prior to starting charging. For example, the battery management system can set the pause time (T _REST ) to be shorter as the SOC of the battery is smaller.

When the rest time (T _REST ) elapses from the first time point (T1) and the second time point (T2) arrives, the battery management system may command the charger to start charging again. The battery management system may command the charger to fast charge so that the battery can be quickly charged from the second time point (T2). Referring to FIG. 10, at a second time point (T2), the charger may charge the battery at a high C-Rate of 2.75C in response to a command from the battery management system. In this way, in one embodiment of the present invention, the battery management system can adaptively control the charging operation based on the SOC of the battery measured before the start of charging, the waiting time the battery is left unattended before starting charging, etc., and the charging operation may cause Lithium precipitation from the cathode can be effectively suppressed.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the scope of the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. must be interpreted.

10: Charging station
11-14: Chargers
100: Battery system
110: battery pack
111: battery module
120: Battery management system
121: Voltage measurement unit
122: SOC measurement unit
123: Charging control unit

Claims (11)

measuring standby time before starting charging the battery;
If the state of charge (SOC) of the battery is less than or equal to a reference SOC and the standby time is longer than a predetermined threshold time, performing a first charging operation of charging the battery at a first C-Rate; and
When the SOC of the battery reaches the reference SOC by the first charging operation, performing a second charging operation of charging the battery with a second C-Rate greater than the first C-Rate; Includes,
A method of operating a battery management system, wherein the second C-Rate is 5 times or more than the first C-Rate.
According to paragraph 1,
If the SOC of the battery is greater than or equal to the reference SOC or the standby time is shorter than the threshold time, performing the second charging operation without the first charging operation.
According to paragraph 1,
A method of operating a battery management system, wherein the critical time is 20 minutes or more.
According to paragraph 1,
A method of operating a battery management system where the standard SOC is 30%.
According to paragraph 1,
A method of operating a battery management system, providing a predetermined rest time to the battery between the first charging operation and the second charging operation.
According to clause 5,
A method of operating a battery management system, wherein the rest time is 30 seconds or more and 10 minutes or less.
Before an electric vehicle equipped with a battery enters a charging station and charging of the battery begins, measuring the SOC of the battery;
performing a first charging operation of charging the battery at a first C-Rate if the SOC of the battery is less than or equal to a reference SOC;
When the SOC of the battery reaches the reference SOC, stopping charging the battery for an idle time of 30 seconds or more and 10 minutes or less; and
performing a second charging operation of charging the battery at a second C-Rate greater than the first C-Rate when the idle time elapses; A method of operating a battery management system, including.
In clause 7,
A method of operating a battery management system that starts charging the battery at the second C-Rate when the SOC of the battery is greater than or equal to the reference SOC.
In clause 7,
The battery includes an anode and a cathode extending in one direction, and the cathode includes an overhang area that does not face the anode at one end or both ends along the one direction. A method of operating a battery management system. .
In clause 7,
A method of operating a battery management system, wherein the second C-Rate is 5 times or more than the first C-Rate.
According to clause 10,
The first C-Rate is 1/3*C, and the second C-Rate is 2.5C or more.

Images