KR102688034B1 - Apparatus and method for estimating charging time of secondary battery - Google Patents

Abstract

The present invention relates to a charging time estimation device and method that can effectively estimate the charging time of a secondary battery in the process of estimating the charging time of an electric vehicle equipped with a secondary battery. A charging time estimation device according to an embodiment of the present invention is a device for estimating the charging time of a secondary battery, comprising: a monitoring unit configured to measure at least one of the voltage and current of the secondary battery; an estimation unit configured to receive at least one of the voltage and current of the secondary battery from the monitoring unit and estimate the SOC of the secondary battery based on at least one of the voltage and current of the secondary battery; and receiving the current charging current of the secondary battery from the monitoring unit, receiving the SOC of the secondary battery from the estimating unit, and dividing the SOC from full charge to full discharge into a plurality of SOC sections based on the SOC. List, determine the corresponding maximum charging current for each SOC section, estimate the capacity for each SOC section, calculate the section charging time by dividing the capacity for each SOC section by the current charging current or the maximum charging current, and a processor configured to estimate the charging time of the secondary battery based on the section charging time.

Description

Apparatus and method for estimating charging time of secondary battery}

The present invention relates to an apparatus and method for estimating the charging time of a secondary battery, and more specifically, to a charging time estimating device that can effectively estimate the charging time of a secondary battery in the process of estimating the charging time of an electric vehicle equipped with a secondary battery. and methods.

In recent years, as the demand for portable electronic products such as laptops, video cameras, and portable phones has rapidly increased, and as the development of energy storage batteries, robots, and satellites has begun in earnest, high-performance secondary batteries capable of repeated charging and discharging have been developed. Research is actively underway.

Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so they can be freely charged and discharged. It is receiving attention for its extremely low self-discharge rate and high energy density.

In particular, recently, as carbon energy is gradually depleted and interest in the environment increases, demand for hybrid vehicles and electric vehicles is gradually increasing worldwide, including in the United States, Europe, Japan, and Korea. These hybrid vehicles and electric vehicles use the charging and discharging energy of the battery pack to obtain vehicle driving power, so they have received a positive response from many consumers in that they have superior fuel efficiency and do not emit or reduce pollutants compared to vehicles that use only the engine. getting it Therefore, more attention and research is being focused on vehicle batteries, which are a key component of hybrid vehicles and electric vehicles.

As mentioned above, batteries are used in various mobility devices such as automobiles, and since there is a limit to the usage time, it is important to obtain accurate information about the remaining amount of the battery (SOC: State of Charge). Additionally, when charging a battery, it is important to predict the charging time. This charging time is a measure of whether or not charging will continue in order to charge the battery to full charge, so it is very important information for the user when using the device.

In general, when trying to estimate the charging time of a conventional secondary battery, a method was used to calculate the capacity of the secondary battery by simply dividing it by the charging injection current. In this case, it is difficult to accurately estimate the charging time because the value of the charging current that the secondary battery can accept changes during charging.

Additionally, due to differences in the temperature or deterioration rate of the secondary battery, a difference may occur between the charging time displayed to the driver and the actual charging time while charging is in progress. This difference in charging time can cause confusion for drivers. Additionally, due to the difference between the actual charging time and the estimated charging time, the driver may lose confidence in the charging time displayed on the vehicle.

Therefore, the present invention was created to solve the above problems, and includes an improved charging time estimation device that can effectively estimate the charging time of a secondary battery in the process of estimating the charging time of an electric vehicle equipped with a secondary battery, and It's about method.

Other objects and advantages of the present invention can be understood from the following description, and will be more clearly understood by practicing the present invention. In addition, it will be readily apparent that the objects and advantages of the present invention can be realized by means and combinations thereof indicated in the claims.

A charging time estimation device according to an embodiment of the present invention for achieving the above object is a device for estimating the charging time of a secondary battery, and a monitoring unit configured to measure at least one of the voltage and current of the secondary battery. ; an estimation unit configured to receive at least one of the voltage and current of the secondary battery from the monitoring unit and estimate the SOC of the secondary battery based on at least one of the voltage and current of the secondary battery; and receiving the current charging current of the secondary battery from the monitoring unit, receiving the SOC of the secondary battery from the estimating unit, and dividing the SOC from full charge to full discharge into a plurality of SOC sections based on the SOC. List, determine the corresponding maximum charging current for each SOC section, estimate the capacity for each SOC section, calculate the section charging time by dividing the capacity for each SOC section by the current charging current or the maximum charging current, and a processor configured to estimate the charging time of the secondary battery based on the section charging time.

In addition, the monitoring unit is configured to measure at least one of voltage, current, and temperature, and the estimation unit receives at least one of the voltage, current, and temperature of the secondary battery from the monitoring unit, and is configured to measure at least one of the voltage, current, and temperature of the secondary battery. The SOC of the secondary battery is estimated based on at least one of voltage, current, and temperature, and the processor receives at least one of the current charging current and temperature of the secondary battery from the monitoring unit, and the SOC and temperature Based on at least one of the following, the SOC from full charge to full discharge can be divided into multiple SOC sections and listed.

Additionally, the processor may calculate the section charging time by dividing the capacity of each SOC section by the smaller of the current charging current and the maximum charging current.

Additionally, the processor may be configured to estimate the charging time of the secondary battery by adding up the charging time of each section.

Additionally, the processor may be configured to calculate the section charging time by dividing the capacity for each SOC section by the smaller of the current charging current and the maximum charging current corresponding to each SOC section on a one-to-one basis.

In addition, the estimation unit receives at least one of the voltage, current, and temperature of the secondary battery from the monitoring unit, and estimates the SOH of the secondary battery based on at least one of the voltage, current, and temperature of the secondary battery. It can be configured to do so.

In addition, the processor is configured to receive the SOH value of the secondary battery from the monitoring unit and determine the SOC section by multiplying the SOC section corresponding to the current temperature value of the secondary battery by the SOH value of the secondary battery. It can be.

In addition, the charging time estimation device according to an embodiment of the present invention divides the SOC from fully charged to fully discharged of the secondary battery into a plurality of SOC sections based on the temperature of the secondary battery, and stores the pre-stored SOC in advance. It may further include a memory device configured to pre-store the maximum charging current corresponding to each SOC section.

In addition, the BMS according to an embodiment of the present invention for achieving the above object includes a charging time estimation device according to the present invention.

In addition, a battery pack according to an embodiment of the present invention for achieving the above object includes a charging time estimation device according to the present invention.

In addition, the charging time estimation method according to an embodiment of the present invention to achieve the above object is a method of estimating the charging time of a secondary battery, and measures at least one of the voltage, current, and temperature of the secondary battery. steps; Receiving at least one of the voltage, current, and temperature of the secondary battery measured by the measurement step, estimating the SOC of the secondary battery based on at least one of the voltage, current, and temperature of the secondary battery, Based on at least one of the temperature value and SOC value of the secondary battery, the SOC from full charge to full discharge is divided into a plurality of SOC sections, the corresponding maximum charging current is determined for each SOC section, and each SOC section estimating star capacity; and calculating section charging time by dividing the capacity for each SOC section by the current charging current or the maximum charging current, and estimating the charging time of the secondary battery based on the section charging time.

According to one aspect of the present invention, by dividing a plurality of SOC sections and determining the charging current for each SOC section separately, there is an effect of accurately estimating the charging time of the secondary battery.

In particular, according to one embodiment of the present invention, the accuracy of charging time prediction can be improved by determining the smaller value of the maximum charging current and the current charging current in each SOC section as the charging current.

In particular, according to an embodiment of the present invention, in the process of changing the SOC as the secondary battery is charged, an improved charging time of the secondary battery can be estimated accurately by determining the number of SOC sections and the capacity of each SOC section. An apparatus and method for estimating the charging time of a secondary battery may be provided.

In addition, the present invention can have various other effects, and these other effects of the present invention can be understood through the following description and can be more clearly seen through examples of the present invention.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the invention described later. Therefore, the present invention includes the matters described in such drawings. It should not be interpreted as limited to only .
Figure 1 is a diagram schematically showing a configuration in which a charging time estimating device according to an embodiment of the present invention is connected to some components of a vehicle.
Figure 2 is a diagram schematically showing a process for estimating a charging time by a charging time estimating device according to an embodiment of the present invention.
Figure 3 is a graph showing the relationship between the maximum charging current and SOC referenced by the charging time estimation device according to an embodiment of the present invention.
Figure 4 is a flowchart schematically showing a charging time estimation method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms or words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately use the concept of terms to explain his or her invention in the best way. It must be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle of definability.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not entirely represent the technical idea of the present invention, so at the time of filing the present application, various options that can replace them are available. It should be understood that equivalents and variations may exist.

Additionally, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Throughout the specification, when a part is said to “include” a certain element, this means that it does not exclude other elements, but may further include other elements, unless specifically stated to the contrary. Additionally, terms such as 'processor' used in the specification refer to a unit that processes at least one function or operation, and may be implemented as hardware, software, or a combination of hardware and software.

Additionally, throughout the specification, when a part is said to be "connected" to another part, this refers not only to the case where it is "directly connected" but also to the case where it is "indirectly connected" with another element in between. Includes.

In this specification, a secondary battery refers to an independent cell that has a negative electrode terminal and a positive electrode terminal and is physically separable. As an example, one pouch-type lithium polymer cell may be considered a secondary battery. Additionally, in this specification, the cell assembly may include at least one secondary battery connected in series and/or parallel.

The charging time estimation device according to an embodiment of the present invention may be a device that estimates the charging time of a secondary battery installed in a vehicle. For example, the charging time estimation device according to an embodiment of the present invention may be a device that estimates the charging time of a secondary battery provided in a battery pack mounted on a vehicle. For example, as shown in the configuration of FIG. 1, in a battery pack equipped with a charging time estimation device according to an embodiment of the present invention, both ends of the battery pack may be electrically connected to the vehicle load 50. Additionally, the charging time estimation device according to an embodiment of the present invention may be electrically connected to the external device 30 provided in the vehicle. For example, the external device 30 may be a vehicle ECU (Electronic Control Unit).

Figure 1 is a diagram schematically showing a configuration in which a charging time estimating device according to an embodiment of the present invention is connected to some components of a vehicle.

Referring to FIG. 1, a charging time estimating device according to an embodiment of the present invention may include a monitoring unit 100, an estimating unit 200, and a processor 300.

The monitoring unit 100 may be configured to measure at least one of the voltage and current of the secondary battery. For example, the monitoring unit 100 may be configured to measure the voltage of a secondary battery. For example, as shown in the configuration of FIG. 1, the monitoring unit 100 may be electrically connected to both ends of the cell assembly 10. Additionally, the monitoring unit 100 may be electrically coupled to the estimation unit 200 to exchange electrical signals. Additionally, the monitoring unit 100 may be electrically coupled to the processor 300 to exchange electrical signals. In addition, the monitoring unit 100 may measure the voltage across the cell assembly 10 at time intervals under the control of the processor 300 and output a signal indicating the magnitude of the measured voltage to the estimation unit 200. there is. At this time, the estimation unit 200 may determine the voltage of the cell assembly 10 from the signal output from the monitoring unit 100. For example, the monitoring unit 100 may be implemented using a voltage measurement circuit commonly used in the industry.

Additionally, the monitoring unit 100 may be configured to measure the current of the secondary battery. For example, as shown in the configuration of FIG. 1, the monitoring unit 100 may be electrically connected to both ends of the current sensor 110 provided on the charge/discharge path of the cell assembly 10. Additionally, the monitoring unit 100 may be electrically coupled to the estimation unit 200 to exchange electrical signals. In addition, the monitoring unit 100, under the control of the processor 300, repeatedly measures the magnitude of the charging current or discharging current of the cell assembly 10 at time intervals and sends a signal indicating the magnitude of the measured current to the estimation unit ( 200). At this time, the estimation unit 200 may determine the magnitude of the current from the signal output from the monitoring unit 100. For example, the current sensor 110 may be implemented using a Hall sensor or sense resistor commonly used in the industry.

Preferably, the monitoring unit 100 according to an embodiment of the present invention may be configured to measure at least one of voltage, current, and temperature of the secondary battery. For example, the monitoring unit 100 may be configured to measure the temperature of the secondary battery. For example, as shown in the configuration of FIG. 1, the monitoring unit 100 is connected to the cell assembly 10 and can measure the temperature of the secondary battery provided in the cell assembly 10. Additionally, the monitoring unit 100 may be electrically coupled to the estimation unit 200 to exchange electrical signals. Additionally, the monitoring unit 100 may repeatedly measure the temperature of the secondary battery at time intervals and output a signal indicating the magnitude of the measured temperature to the estimation unit 200. At this time, the estimation unit 200 may determine the temperature of the secondary battery from the signal output from the monitoring unit 100. For example, the monitoring unit 100 may be implemented using a thermocouple commonly used in the industry.

The estimation unit 200 may receive at least one of the voltage and current of the secondary battery from the monitoring unit 100. Also, preferably, the estimation unit 200 according to an embodiment of the present invention may receive at least one of the voltage, current, and temperature of the secondary battery from the monitoring unit 100.

Additionally, the estimator 200 may estimate the SOC of the secondary battery based on at least one of the voltage and current of the secondary battery. Also, preferably, the estimator 200 according to an embodiment of the present invention may estimate the SOC of the secondary battery based on at least one of the voltage, current, and temperature of the secondary battery.

The estimation unit 200 may receive status information of the secondary battery from the monitoring unit 100. Here, the state information of the secondary battery may include the voltage value of the secondary battery, the current value of the secondary battery, and the temperature value of the secondary battery. More specifically, the state information of the secondary battery may include a voltage value at both ends of the secondary battery, a current value flowing through the secondary battery, and a temperature value of the secondary battery.

In addition, the estimation unit 200 uses at least one of the voltage measurement value, current measurement value, and temperature measurement value for the secondary battery received from the monitoring unit 100 to determine the state of charge (SOC: State Of) of the secondary battery. Charge) can be calculated to estimate the remaining amount of the secondary battery. Additionally, the estimation unit 200 may calculate the estimated SOC using the estimated remaining amount of the secondary battery. Here, the estimated SOC can be calculated as a value corresponding to the remaining amount of the secondary battery in the range of 0% to 100%.

In one aspect of the present invention, the estimation unit 200 may estimate the state of charge of the secondary battery by integrating the charging current and discharging current of the secondary battery. Here, when charging or discharging of the secondary battery begins, the initial value of the charging state can be determined using the open circuit voltage (OCV) of the secondary battery measured before charging or discharging begins. To this end, the estimation unit 200 includes an open-circuit voltage-state-of-charge lookup table that defines the state of charge for each open-circuit voltage, and can map the state of charge corresponding to the open-circuit voltage of the secondary battery from the lookup table.

In another aspect of the present invention, the estimation unit 200 may calculate the state of charge of the secondary battery using an extended Kalman filter. The extended Kalman filter refers to a mathematical algorithm that adaptively estimates the state of charge of a secondary battery using the voltage, current, and temperature of the secondary battery. Here, the estimation of the state of charge using the extended Kalman filter is, as an example, Gregory L. Plett's paper "Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs Parts 1, 2 and 3". (Journal of Power Source 134, 2004, p. 252-261).

In addition to the current integration method or extended Kalman filter described above, the state of charge of the secondary battery can be determined by other known methods that can selectively estimate the state of charge by using the voltage, current, and temperature of the secondary battery.

More preferably, the estimation unit 200 according to an embodiment of the present invention receives at least one of the voltage, current, and temperature of the secondary battery from the monitoring unit 100, and The SOH (State Of Health) of the secondary battery can be estimated based on at least one of the following. Here, SOH of the secondary battery refers to the degradation rate.

In addition to the method using the voltage, current, and temperature of the secondary battery described above, the degradation rate of the secondary battery can also be determined by other known methods that can estimate the degradation rate by selectively using the SOC of the secondary battery and the internal resistance of the secondary battery. there is.

The processor 300 may receive the current charging current of the secondary battery from the monitoring unit 100. Additionally, the processor 300 may receive the SOC of the secondary battery from the estimation unit 200. For example, SOC may be a value corresponding to the remaining amount of the secondary battery in the range of 0% to 100%. Additionally, the processor 300 may divide the SOC from full charge to full discharge into a plurality of SOC sections based on the SOC. For example, a plurality of SOC sections refers to a section in which SOC ranging from 0% to 100% is divided into a plurality of sections. For example, when the processor 300 divides the SOC into five SOC sections, one section may mean a SOC section ranging from SOC 0% to 60%. Additionally, section 2 may mean a SOC section ranging from 60% to 80% SOC. Additionally, section 3 may mean a SOC section ranging from 80% to 90% SOC. Additionally, section 4 may mean a SOC section ranging from 90% to 97% SOC. Additionally, section 5 may mean a SOC section ranging from 97% to 100% SOC. For example, in a plurality of SOC sections, the number of SOC sections and the SOC boundary value of each SOC section may be set differently depending on the SOC of the secondary battery.

More preferably, the processor 300 according to an embodiment of the present invention receives the SOH value of the secondary battery from the monitoring unit 100, and stores the SOH value of the secondary battery in the SOC section corresponding to the current temperature value of the secondary battery. The SOC section can be determined by multiplying the SOH value. For example, in a plurality of SOC sections, the number of SOC sections and the SOC boundary value of each SOC section may be set differently depending on the temperature and SOH of the secondary battery.

Also, preferably, the processor 300 according to an embodiment of the present invention may receive at least one of the current charging current and temperature of the secondary battery from the monitoring unit 100. Additionally, the processor 300 may divide the SOC from full charge to full discharge into a plurality of SOC sections based on at least one of SOC and temperature. For example, in a plurality of SOC sections, the number of SOC sections and the SOC boundary value of each SOC section may be set differently depending on the SOC and temperature of the secondary battery.

Additionally, the processor 300 may determine the maximum charging current corresponding to each SOC section. Here, the maximum charging current may mean the size of the charging current that the secondary battery can maximum accept when the secondary battery is being charged. For example, the processor 300 may determine the maximum charging current corresponding to each SOC section among the plurality of SOC sections. For example, the processor 300 may determine that the maximum charging current in one section is 17A. Additionally, the processor 300 may determine that the maximum charging current in two sections is 15A. Additionally, the processor 300 may determine that the maximum charging current in three sections is 10A. Additionally, the processor 300 may determine that the maximum charging current in 4 sections is 5A. Additionally, the processor 300 may determine that the maximum charging current for 5 sections is 2A. For example, the processor 300 may determine the maximum charging current corresponding to each SOC section based on the SOC and temperature of the secondary battery. For example, the processor 300 may include a SOC section-maximum charge current table that defines the maximum charge current for each SOC and temperature of the secondary battery.

Additionally, the processor 300 can estimate the capacity for each SOC section among a plurality of SOC sections. Here, the unit of capacity may be Ah (Ampere Hour). For example, the processor 300 may estimate the capacity of each SOC section of the secondary battery based on at least one of the SOC, SOH, and temperature of the secondary battery. For example, the processor 300 may include a SOC section-capacity table that defines the capacity by SOC, SOH, and temperature of the secondary battery.

Additionally, the processor 300 may calculate the section charging time by dividing the capacity of each SOC section by the current charging current or maximum charging current. Here, the unit of the current charging current and maximum charging current may be A (Ampere). For example, the processor 300 may calculate the section charging time of each SOC section by dividing the capacity of each SOC section by the current charging current or the maximum charging current for each SOC section.

Additionally, the processor 300 may estimate the charging time of the secondary battery based on the section charging time. For example, the processor 300 may estimate the charging time of the secondary battery based on the section charging time of each SOC section.

Preferably, the charging time estimation device according to an embodiment of the present invention may further include a memory device 400, as shown in the configuration of FIG. 1.

The memory device 400 may divide the SOC from fully charged to fully discharged of the secondary battery into a plurality of SOC sections based on the temperature of the secondary battery and store them in advance. Additionally, the memory device 400 may pre-store the maximum charging current corresponding to each pre-stored SOC section.

Additionally, the memory device 400 may divide the SOC from fully charged to fully discharged of the secondary battery into a plurality of SOC sections based on the temperature and SOH of the secondary battery and store them in advance.

Additionally, the memory device 400 may include a temperature-SOC section table that defines SOC sections for each temperature of the secondary battery. Additionally, the memory device 400 may include a SOC section-maximum charge current table that defines the maximum charge current for each SOC and temperature of the secondary battery. Additionally, the memory device 400 may include a SOC section-capacity table that defines capacity by SOC, SOH, and temperature of the secondary battery.

Additionally, the memory device 400 may include an open-circuit voltage-remaining amount lookup table that defines the remaining amount for each open-circuit voltage of the secondary battery. Additionally, the memory device 400 may include information necessary for the monitoring unit 100 and the estimation unit 200 to calculate the estimated SOC. Here, the estimation unit 200 may estimate the remaining amount of the secondary battery using an open-circuit voltage-remaining amount lookup table. Additionally, the memory device 400 may include an internal resistance-SOH lookup table that defines SOH for each internal resistance of the secondary battery.

Meanwhile, in order to perform the above-described operations, the processor 300 includes a processor 300, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, registers, communication modems, and/or data known in the art. It may be implemented in a form that selectively includes a processing device, etc.

Meanwhile, the type of the memory device 400 is not particularly limited as long as it is a storage medium capable of recording and erasing information. For example, the memory device 400 may be RAM, ROM, register, hard disk, optical recording medium, or magnetic recording medium. The memory devices 400 may also be electrically connected to the processor 300 through, for example, a data bus so that each of the memory devices 400 can be accessed by the processor 300 . The memory device 400 can also store and/or update and/or erase and/or transmit programs including various control logics each performed by the processor 300 and/or data generated when the control logic is executed. there is.

Figure 2 is a diagram schematically showing a process for estimating a charging time by a charging time estimating device according to an embodiment of the present invention.

Referring to FIG. 2, the charging time estimation device according to an embodiment of the present invention can estimate the charging time based on the SOC section and charging current.

Preferably, the charging time estimation device according to an embodiment of the present invention determines the SOC section of the secondary battery based on at least one of the SOC, SOH, and temperature of the secondary battery in step 310, and lists the SOC sections. can do. For example, as shown in Figure 2, the charging time estimation device according to an embodiment of the present invention can divide the SOC in the range of 0% to 100% into 5 SOC sections from 1 to 5 sections. there is. Additionally, the charging time estimation device according to an embodiment of the present invention can estimate the capacity for each SOC section. For example, as shown in FIG. 2, the charging time estimation device according to an embodiment of the present invention can estimate the capacity for each SOC section for five SOC sections from section 1 to section 5.

Also, preferably, the charging time estimation device according to an embodiment of the present invention may determine the charging current of the secondary battery based on at least one of the temperature and supply current of the secondary battery in step 320. Here, the supply current may mean the current charging current of the secondary battery received from the monitoring unit. For example, the charging time estimation device according to an embodiment of the present invention may determine the charging current of the secondary battery based on the maximum charging current and current charging current of each SOC section. For example, as shown in FIG. 2, the charging time estimation device according to an embodiment of the present invention corresponds to five SOC sections from section 1 to section 5, and the charging current corresponding to section 1 to section 5, respectively. can be judged and listed.

In addition, preferably, the charging time estimation device according to an embodiment of the present invention may calculate the section charging time by dividing the capacity of each SOC section by the smaller of the current charging current and the maximum charging current in step 330. . For example, the charging time estimation device according to an embodiment of the present invention divides the capacity of each section by the smaller of the current charging current and the maximum charging current for each section for five SOC sections from section 1 to section 5. The charging time for each section can be calculated.

More preferably, the charging time estimation device according to an embodiment of the present invention divides the capacity for each SOC section by the smaller of the current charging current and the maximum charging current corresponding to each SOC section on a one-to-one basis in step 330. Charging time can be calculated. For example, the charging time estimation device according to an embodiment of the present invention allows the five SOC sections and the five charging currents to correspond one-to-one for the five SOC sections from section 1 to section 5, so that the current charge for each section The charging time for each section can be calculated by dividing the capacity of each section by the smaller of the current and maximum charging current. For example, as shown in the drawing of FIG. 2, one section may correspond to one charging current. Additionally, 2 sections can correspond to 2 charging currents. Additionally, 3 sections can correspond to 3 charging currents. Additionally, 4 sections can correspond to 4 charging currents. Additionally, 5 sections can correspond to 5 charging currents.

Also, preferably, the charging time estimation device according to an embodiment of the present invention may estimate the charging time of the secondary battery by adding up the charging time of each section in step 340.

<Equation 1>

Here, T _R is the charging time of the secondary battery, i is the SOC section, C is the capacity for each SOC section, SOH is the degradation rate of the secondary battery, and I is the charging current of each SOC section. It can mean.

For example, the charging time estimation device may estimate the charging time of the secondary battery by adding up the charging times for each section calculated for each SOC section.

Also, preferably, the charging time estimation device according to an embodiment of the present invention may transmit the charging time of the secondary battery to an external device in step 350. For example, the external device may be a vehicle ECU (Electronic Control Unit).

Figure 3 is a graph showing the relationship between the maximum charging current and SOC referenced by the charging time estimation device according to an embodiment of the present invention.

Referring to FIG. 3, the charging time estimation device according to an embodiment of the present invention can divide the SOC ranging from 0% to 100% into five SOC sections from 1 to 5 sections. For example, section 1 may mean a SOC section ranging from 0% to 60% SOC. Additionally, section 2 may mean a SOC section ranging from 60% to 80% SOC. Additionally, section 3 may mean a SOC section ranging from 80% to 90% SOC. Additionally, section 4 may mean a SOC section ranging from 90% to 97% SOC. Additionally, section 5 may mean a SOC section ranging from 97% to 100% SOC.

Additionally, the charging time estimation device according to an embodiment of the present invention can determine the maximum charging current for each SOC section. For example, the maximum charging current in one section may be 17A. Additionally, the maximum charging current in section 2 may be 15A. Additionally, the maximum charging current in three sections may be 10A. Additionally, the maximum charging current in 4 sections may be 5A. Additionally, the maximum charging current in section 5 may be 2A.

Additionally, the charging time estimation device according to an embodiment of the present invention can determine the charging current for each SOC section while the SOC of the secondary battery increases from 0% to 100%. For example, the charging current may be the smaller of the maximum charging current and the current charging current in each SOC section. For example, in situation A of the graph of FIG. 3, the maximum charging current in one section may be 17A, and the current charging current may be 20A. In this case, the charging current in situation A may be 17A. Additionally, the charging time estimation device according to an embodiment of the present invention can compare the current charging current and the maximum charging current in real time and determine the smaller value of the current charging current and the maximum charging current as the charging current.

Additionally, the charging time estimation device according to an embodiment of the present invention can estimate the capacity for each SOC section. For example, in the graph of Figure 3, the capacity of section 1 ranges from 0Ah to 20Ah when SOC ranges from 0% to 60%, so the capacity of section 1 may be 20Ah. there is. In addition, the capacity of section 2 may be 7Ah because the capacity of section 2 ranges from 20Ah to 27Ah when the SOC ranges from 60% to 80%. In addition, the capacity of the 3rd section may be 3Ah because the capacity of the 3rd section ranges from 27Ah to 30Ah when the SOC ranges from 80% to 90%. Additionally, the capacity of the 4 sections ranges from 30 Ah to 33 Ah when the SOC ranges from 90% to 97%, so the capacity of the 4 sections may be 3 Ah. In addition, the capacity of section 5 may be 2Ah because the capacity of section 5 ranges from 33Ah to 35Ah when the SOC ranges from 97% to 100%.

Additionally, the charging time estimation device according to an embodiment of the present invention can calculate the section charging time by dividing the capacity of each SOC section by the smaller of the current charging current and the maximum charging current. For example, in the graph of FIG. 3, the charging time estimation device according to an embodiment of the present invention can estimate the charging time from point A at SOC 30% until the secondary battery is fully charged at SOC 100%. there is. For example, it is assumed that the current charging current supplied to the secondary battery is constantly 20A. In this case, the section charging time for one section may be the value obtained by dividing 10Ah, the remaining capacity of one section at point A, by 17A. Additionally, the section charging time for section 2 may be the value obtained by dividing 7Ah, the capacity of section 2, by 15A. Additionally, the charging time for the 3 sections may be the value obtained by dividing 3 Ah, the capacity of the 3 sections, by 10A. Additionally, the charging time for the 4 sections may be the value obtained by dividing 3Ah, the capacity of the 4 sections, by 5A. Additionally, the section charging time of 5 sections may be the value obtained by dividing 2Ah, the capacity of 5 sections, by 2A.

Additionally, the charging time estimation device according to an embodiment of the present invention can estimate the charging time of the secondary battery by adding up the charging time of each section. For example, in the graph of FIG. 3, the section charging time of section 1, the section charging time of section 2, the section charging time of section 3, the section charging time of section 4, and the section charging time of section 5 are all added up to obtain the section charging time of the secondary battery. Charging time can be estimated.

Through this configuration, the charging time estimation device according to an embodiment of the present invention determines the number of SOC sections and the capacity of each SOC section in the process of changing the SOC value as the secondary battery is charged to accurately determine the secondary battery. It has the advantage of being able to estimate the charging time.

Through this configuration, the charging time estimation device according to an embodiment of the present invention calculates the charging current of each SOC section in the process of changing the SOC value as the secondary battery is charged to provide an accurate charging time for the secondary battery. There is an advantage in being able to estimate .

The battery charging time estimation device according to the present invention can be applied to BMS. That is, the BMS according to the present invention may include the charging time estimation device according to the present invention described above. In this configuration, at least some of the components of the charging time estimation device according to the present invention can be implemented by supplementing or adding functions of the components included in the conventional BMS. For example, each component of the charging time estimation device according to the present invention may be implemented as a component of a BMS (Battery Management System).

Additionally, the charging time estimation device according to the present invention may be provided in a battery pack. That is, the battery pack according to the present invention may include the charging time estimation device according to the present invention described above. Here, the battery pack may include one or more secondary batteries, the charging time estimation device, electrical components (equipped with a BMS, relay, fuse, etc.), and a case.

Figure 4 is a flowchart schematically showing a charging time estimation method according to an embodiment of the present invention. In Figure 4, the subject performing each step can be said to be each component of the charging time estimation device according to the present invention described above.

As shown in FIG. 4, the charging time estimation method according to an embodiment of the present invention includes a measurement step (S100), a capacity estimation step for each SOC section (S110), and a charging time estimation step (S120).

First, in the measurement step (S100), at least one of voltage, current, and temperature of the secondary battery can be measured. Subsequently, in the capacity estimation step for each SOC section (S110), at least one of the voltage, current, and temperature of the secondary battery measured by the measurement step is received, and at least one of the voltage, current, and temperature of the secondary battery is received. Based on the above, the SOC of the secondary battery can be estimated. In addition, based on at least one of the temperature value and SOC value of the secondary battery, the SOC from full charge to full discharge is divided into a plurality of SOC sections, and the corresponding maximum charging current is determined for each SOC section, Capacity for each SOC section can be estimated. Next, in the charging time estimation step (S120), the section charging time is calculated by dividing the capacity of each SOC section by the current charging current or the maximum charging current, and the charging time of the secondary battery is estimated based on the section charging time. You can.

Preferably, in the charging time estimation step (S120) according to an embodiment of the present invention, the section charging time can be calculated by dividing the capacity for each SOC section by the smaller of the current charging current and the maximum charging current. .

Preferably, in the charging time estimation step (S120) according to an embodiment of the present invention, the charging time of the secondary battery can be estimated by adding the charging time of each section.

Preferably, in the charging time estimation step (S120) according to an embodiment of the present invention, the capacity for each SOC section is divided by the smaller of the current charging current and the maximum charging current corresponding to each SOC section on a one-to-one basis. The section charging time can be calculated.

Preferably, in the SOC estimation step (S110) according to an embodiment of the present invention, at least one of the voltage, current, and temperature of the secondary battery is received from the monitoring unit, and the voltage, current, and temperature of the secondary battery are received. The SOH of the secondary battery can be estimated based on at least one of the following.

Next, in the charging time estimation step (S120) according to an embodiment of the present invention, the SOH value of the secondary battery is received from the monitoring unit, and the secondary battery is stored in the SOC section corresponding to the current temperature value of the secondary battery. The SOC section can be determined by multiplying the SOH value.

Additionally, when the control logic is implemented as software, the processor may be implemented as a set of program modules. At this time, the program module may be stored in the memory device and executed by the processor.

In addition, at least one of the various control logics of the processor is combined, and the types of the combined control logic are not particularly limited as long as they are written in a computer-readable code system and can be accessed in a computer-readable manner. As an example, the recording medium includes at least one selected from the group including ROM, RAM, register, CD-ROM, magnetic tape, hard disk, floppy disk, and optical data recording device. Additionally, the code system can be distributed, stored and executed on computers connected to a network. Additionally, functional programs, codes, and segments for implementing the combined control logics can be easily deduced by programmers in the technical field to which the present invention pertains.

As described above, although the present invention has been described with limited examples and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following will be understood by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalence of the patent claims to be described.

10: Cell assembly
30: external device
50: Vehicle load
100: Monitoring unit
110: current sensor
200: Estimation department
300: processor
400: memory device

Claims (11)

In the device for estimating the charging time of a secondary battery,
a monitoring unit configured to measure at least one of voltage and current of the secondary battery;
an estimation unit configured to receive at least one of the voltage and current of the secondary battery from the monitoring unit and estimate the SOC of the secondary battery based on at least one of the voltage and current of the secondary battery; and
Receives the current charging current of the secondary battery from the monitoring unit, receives the SOC of the secondary battery from the estimation unit, divides the SOC from full charge to full discharge into a plurality of SOC sections, and lists each SOC section. The corresponding maximum charging current is determined for each SOC section, the capacity for each SOC section is estimated, the section charging time is calculated by dividing the capacity for each SOC section by the current charging current or the maximum charging current, and the section charging time is based on the section charging time. and a processor configured to estimate the charging time of the secondary battery,
The processor is configured to divide the SOC from full charge to full discharge into the plurality of SOC sections in consideration of the SOH of the secondary battery.
According to paragraph 1,
The monitoring unit is configured to measure at least one of voltage, current, and temperature,
The estimation unit receives at least one of the voltage, current, and temperature of the secondary battery from the monitoring unit, and estimates the SOC of the secondary battery based on at least one of the voltage, current, and temperature of the secondary battery,
The processor receives at least one of the current charging current and temperature of the secondary battery from the monitoring unit, and calculates the SOC from full charge to full discharge based on at least one of the SOC and temperature into a plurality of SOC sections. A charging time estimation device characterized in that it is divided into and listed.
According to paragraph 1,
The processor calculates the section charging time by dividing the capacity of each SOC section by the smaller of the current charging current and the maximum charging current.
According to paragraph 3,
The processor is configured to estimate the charging time of the secondary battery by adding up the charging time of each section.
According to paragraph 3,
The processor is configured to calculate the section charging time by dividing the capacity for each SOC section by the smaller of the current charging current and the maximum charging current corresponding to each SOC section on a one-to-one basis.
According to paragraph 1,
The estimation unit is configured to receive at least one of the voltage, current, and temperature of the secondary battery from the monitoring unit, and to estimate the SOH of the secondary battery based on at least one of the voltage, current, and temperature of the secondary battery. A charging time estimation device characterized in that.
According to clause 6,
The processor is configured to receive the SOH value of the secondary battery from the monitoring unit and determine the SOC section by multiplying the SOC section corresponding to the current temperature value of the secondary battery by the SOH value of the secondary battery. A charging time estimation device.
According to paragraph 1,
A memory device configured to pre-store the SOC from fully charged to fully discharged of the secondary battery into a plurality of SOC sections based on the temperature of the secondary battery, and to pre-store the maximum charging current corresponding to each pre-stored SOC section.
A charging time estimation device further comprising:
A BMS including a charging time estimation device according to any one of claims 1 to 8.
A battery pack including the charging time estimation device according to any one of claims 1 to 8.
In a method of estimating the charging time of a secondary battery,
measuring at least one of voltage, current, and temperature of the secondary battery;
Receive at least one of the voltage, current, and temperature of the secondary battery measured by the measurement step, estimate the SOC of the secondary battery based on at least one of the voltage, current, and temperature of the secondary battery, and fully charge the battery. Dividing the SOC from before until full discharge into a plurality of SOC sections, determining the corresponding maximum charging current for each SOC section, and estimating the capacity for each SOC section; and
Calculating section charging time by dividing the capacity for each SOC section by the current charging current or the maximum charging current, and estimating the charging time of the secondary battery based on the section charging time,
The step of estimating the capacity for each SOC section is,
A charging time estimation method comprising dividing the SOC from full charge to full discharge into the plurality of SOC sections by considering the SOH of the secondary battery.

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