KR20200025495A - Apparatus and method for estimating charging time of secondary battery - Google Patents

Abstract

The present invention relates to an apparatus for estimating charging time which can effectively estimate charging time of a secondary battery in a process of estimating charging time of an electric vehicle having the secondary battery and a method thereof. According to an embodiment of the present invention, the apparatus for estimating charging time estimates charging time of a secondary battery. The apparatus comprises: a monitoring unit to measure at least one between a voltage and a current of the secondary battery; an estimation unit to receive at least one between the voltage and the current of the secondary battery from the monitoring unit and estimate an SOC of the secondary battery based on at least one between the voltage and the current of the secondary battery; and a processor to receive a present charging current of the secondary battery from the monitoring unit, receive an SOC of the secondary battery from the estimation unit to divide an SOC from a fully charged state to a fully discharged state into a plurality of SOC sections based on the SOC to list the SOC sections, determine a maximum charging current corresponding to each SOC section, estimate a capacity for each SOC section, divide the capacity for each SOC section by the present charging current or the maximum charging current to calculate section charging time, and 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 a charging time of a secondary battery, and more particularly, to an apparatus for estimating a charging time of a secondary battery in a process of estimating a charging time of an electric vehicle having a secondary battery. And to a method.

In recent years, as the demand for portable electronic products such as laptops, video cameras, mobile phones, and the like is rapidly increasing, and development of energy storage batteries, robots, satellites, and the like is in earnest, high-performance secondary batteries capable of repeating charging and discharging are available. Research is actively being conducted.

Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. It has been spotlighted for its very low self discharge rate and high energy density.

In particular, in recent years, as carbon energy is gradually exhausted and the interest in the environment is increasing, demand for hybrid vehicles and electric vehicles is increasing gradually in the United States, Europe, Japan, and Korea. These hybrid cars or electric vehicles use the charge and discharge energy of the battery pack to obtain vehicle driving power, and thus have a good response to many consumers in that they are more fuel efficient and can emit or reduce pollutants than engine-only cars. Getting Therefore, more attention and research is being focused on the vehicle battery, which is a key component of a hybrid vehicle or an electric vehicle.

As described above, the battery is used in various mobile devices such as automobiles, and since the use time is limited, it is important to know accurate information about the state of charge (SOC) of the battery. In addition, when charging the battery, it is important to predict the charging time. This charging time is a very important information for the user to use the device because it is a measure of whether the charge is continued to charge the battery to full charge.

In general, in order to estimate the charging time of a conventional secondary battery, a method of simply dividing the capacity of the secondary battery by the charge injection current was used. In such a case, it is difficult to accurately estimate the charging time because the value of the charging current acceptable to the secondary battery changes during charging.

In addition, due to a difference in temperature or degradation rate of the secondary battery, a difference may occur between the charging time displayed to the driver and the actual charging time while the charging is in progress. Such a difference in charging time may cause confusion to the driver. In addition, due to such a difference between the actual charging time and the estimated charging time, the driver may lose the reliability of the charging time displayed on the vehicle.

Accordingly, the present invention has been made to solve the above problems, an improved charging time estimation apparatus that can effectively estimate the charging time of the secondary battery in the process of estimating the charging time of the electric vehicle having a secondary battery and It is about a method.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the claims.

A charging time estimating apparatus according to an embodiment of the present invention for achieving the above object, as a device for estimating the charging time of the secondary battery, a monitoring unit configured to measure at least one or more of the voltage and current of the secondary battery. ; An estimator configured to receive at least one or more of the voltage and current of the secondary battery from the monitoring unit, and estimate an SOC of the secondary battery based on at least one or more 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 based on the SOC into a plurality of SOC sections. Determine the maximum charging current corresponding to 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 a charging time of the secondary battery based on the interval charging time.

The monitoring unit may be configured to measure at least one of voltage, current, and temperature, and the estimating unit receives at least one or more of voltage, current, and temperature of the secondary battery from the monitoring unit. Estimates an SOC of the secondary battery based on at least one of voltage, current, and temperature, and the processor receives at least one of a current charge current and a temperature of the secondary battery from the monitoring unit; Based on at least one or more of the SOC from full charge to full discharge can be divided into a plurality of SOC intervals.

The processor may calculate the interval charging time by dividing the capacity for each SOC interval by a smaller value of the current charge current and the maximum charge current.

In addition, the processor may be configured to estimate the charging time of the secondary battery by summing the respective charging periods.

The processor may be configured to calculate the interval charging time by dividing the capacity for each SOC interval by a smaller value of the current charge current and the maximum charge current corresponding to each SOC interval one-to-one.

The estimator may receive at least one or more of the voltage, current, and temperature of the secondary battery from the monitoring unit, and estimate the SOH of the secondary battery based on at least one or more of the voltage, current, and temperature of the secondary battery. It can be configured to.

The processor may be configured to receive the SOH value of the secondary battery from the monitoring unit, and determine the SOC interval by multiplying the SOC interval corresponding to a current temperature value of the secondary battery by the SOH value of the secondary battery. Can be.

In addition, the charging time estimation apparatus according to an embodiment of the present invention, the SOC from the full charge to the full discharge of the secondary battery divided into a plurality of SOC intervals based on the temperature of the secondary battery in advance and stored in advance The memory device may further include a memory device configured to prestore a corresponding maximum charging current for each SOC period.

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

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

In addition, the charging time estimation method according to an embodiment of the present invention for achieving the above object, as a method for estimating the charging time of the secondary battery, measuring at least one or more of the voltage, current and temperature of the secondary battery. Making; Receive at least one or more of the voltage, current and temperature of the secondary battery measured by the measuring step, and estimate the SOC of the secondary battery based on at least one or more of the voltage, current and temperature of the secondary battery, Based on at least one of the temperature value and the SOC value of the secondary battery, SOCs from full charge to full discharge are divided into a plurality of SOC sections, and the corresponding maximum charging current is determined for each SOC section, and each SOC section Estimating the star dose; And calculating a section charging time by dividing the capacity for each SOC section by a current charging current or the maximum charging current, and estimating a charging time of the secondary battery based on the section charging time.

According to an aspect of the present invention, by separately determining the charging current for each SOC section by dividing the plurality of SOC sections, the charging time of the secondary battery can be accurately estimated.

In particular, according to an embodiment of the present invention, by determining the smaller of the maximum charging current and the current charging current of each SOC interval as the charging current, it is possible to improve the accuracy of the charging time prediction.

Particularly, according to an embodiment of the present invention, in the process of changing the SOC by charging the secondary battery, the number of SOC sections and the capacity of each SOC section may be judged to improve the accurate charging time of the secondary battery. An apparatus and method for estimating charge time of a secondary battery may be provided.

In addition to the present invention may have a variety of other effects, such other effects of the present invention can be understood by the following description, it will be more clearly understood by the embodiments of the present invention.

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a diagram schematically illustrating a configuration in which a charging time estimating apparatus according to an embodiment of the present invention is connected to a partial configuration of a vehicle.
2 is a diagram schematically illustrating a process of estimating a charging time by an apparatus for estimating charging time according to an embodiment of the present invention.
3 is a graph showing a relationship between the maximum charging current and the SOC referred to by the charging time estimating apparatus according to the embodiment of the present invention.
4 is a flowchart schematically illustrating a charging time estimation method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own inventions. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical spirit of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated. In addition, the term 'processor' described in the specification means a unit for processing at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

In addition, throughout the specification, when a part is "connected" to another part, it is not only "directly connected" but also "indirectly connected" with another element in between. Include.

In the present specification, the secondary battery means one independent cell having a negative electrode terminal and a positive electrode terminal and physically separable. For example, one pouch type lithium polymer cell may be regarded as a secondary battery. Also, in the present specification, the cell assembly may include at least one secondary battery connected in series and / or in parallel.

The charging time estimating apparatus according to an embodiment of the present invention may be an apparatus for estimating the charging time of a secondary battery provided in a vehicle. For example, the charging time estimating apparatus according to an embodiment of the present invention may be an apparatus for estimating the charging time of a secondary battery included in a battery pack mounted in a vehicle. For example, as shown in the configuration of FIG. 1, in the battery pack equipped with the charging time estimating apparatus according to an embodiment of the present invention, both ends of the battery pack may be electrically connected to the vehicle load 50. In addition, the charging time estimating apparatus 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 an ECU (Electronic Control Unit) of a vehicle.

1 is a diagram schematically illustrating a configuration in which a charging time estimating apparatus according to an embodiment of the present invention is connected to a partial configuration of a vehicle.

Referring to FIG. 1, a charging time estimating apparatus 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 voltage and current of the secondary battery. For example, the monitoring unit 100 may be configured to measure the voltage 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 cell assembly 10. In addition, the monitoring unit 100 may be electrically coupled with the estimating unit 200 to exchange electrical signals. In addition, the monitoring unit 100 may be electrically coupled with the processor 300 to transmit and receive electrical signals. In addition, under the control of the processor 300, the monitoring unit 100 may measure voltages at both ends of the cell assembly 10 at intervals of time and output a signal indicating the magnitude of the measured voltage to the estimator 200. have. In this case, the estimator 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 measuring circuit generally used in the art.

In addition, 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. In addition, the monitoring unit 100 may be electrically coupled with the estimating unit 200 to exchange electrical signals. In addition, under the control of the processor 300, the monitoring unit 100 repeatedly measures the magnitude of the charging current or the discharging current of the cell assembly 10 at a time interval and estimates a signal indicating the magnitude of the measured current. 200). At this time, the estimator 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 generally used in the art.

Preferably, the monitoring unit 100 according to an embodiment of the present invention, may be configured to measure at least one or more of the 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 may be connected to the cell assembly 10 to measure the temperature of the secondary battery provided in the cell assembly 10. In addition, the monitoring unit 100 may be electrically coupled with the estimating unit 200 to exchange electrical signals. In addition, the monitoring unit 100 may repeatedly measure the temperature of the secondary battery at intervals of time and output a signal indicating the magnitude of the measured temperature to the estimating unit 200. In this case, the estimator 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 generally used in the art.

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

In addition, the estimator 200 may estimate the SOC of the secondary battery based on at least one of the voltage and the current of the secondary battery. Also, preferably, the estimator 200 estimates the SOC of the secondary battery based on at least one of voltage, current, and temperature of the secondary battery.

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

In an aspect of the present disclosure, the estimator 200 may estimate the state of charge of the secondary battery by integrating the charge current and the discharge current of the secondary battery. Here, the initial value of the state of charge when the charging or discharging of the secondary battery starts may be determined using an open circuit voltage (OCV) of the secondary battery measured before the charging or discharging starts. To this end, the estimator 200 may include an open voltage-charge state lookup table defining charge states for each open voltage, and may map a charge state corresponding to the open voltage of the secondary battery from the lookup table.

In another aspect of the present invention, the estimator 200 may calculate the state of charge of the secondary battery using the extended Kalman filter. 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, for example, Gregory L. Plett's article "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).

The state of charge of the secondary battery may be determined by other known methods capable of estimating the state of charge by selectively utilizing the voltage, current, and temperature of the secondary battery, in addition to the above-described current integration method or the extended Kalman filter.

More preferably, the estimator 200 according to an embodiment of the present invention receives at least one or more of the voltage, current, and temperature of the secondary battery from the monitoring unit 100, and the voltage, current, and temperature of the secondary battery. The state of health (SOH) of the secondary battery may be estimated based on at least one of the above. Here, SOH of the secondary battery means degeneration rate.

The degeneration rate of the secondary battery may be determined not only by using the above-described voltage, current, and temperature of the secondary battery, but also by other known methods capable of estimating the degeneration rate by selectively utilizing the SOC of the secondary battery and the internal resistance of the secondary battery. have.

The processor 300 may receive the current charging current of the secondary battery from the monitoring unit 100. In addition, the processor 300 may receive the SOC of the secondary battery from the estimator 200. For example, the SOC may be a value corresponding to the remaining amount of the secondary battery in the range of 0% to 100%. In addition, the processor 300 may divide the SOC from full charge to full discharge based on the SOC and divide the SOC into a plurality of SOC sections. For example, the plurality of SOC sections means a section obtained by dividing the SOC in a range of 0% to 100% into a plurality of sections. For example, when the processor 300 divides the data into five SOC sections, one section may mean an SOC section in the range of 0% to 60% SOC. In addition, the two sections may mean an SOC section in the range of 60% to 80% SOC. In addition, the three sections may mean an SOC section in the range of 80% to 90% SOC. In addition, four sections may mean an SOC section in the range of 90% to 97% SOC. In addition, 5 sections may mean an SOC section in the range of SOC 97% to 100%. For example, in the plurality of SOC sections, the number of SOC sections and the SOC boundary value of each SOC section may be set differently according to 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, the SOC section corresponding to the current temperature value of the secondary battery of the secondary battery The SOC interval may be determined by multiplying the SOH value. For example, in the plurality of SOC sections, the number of SOC sections and the SOC boundary value of each SOC section may be set differently according to the temperature and the SOH of the secondary battery.

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

In addition, the processor 300 may determine a maximum charging current corresponding to each SOC section. Here, the maximum charging current may refer to a magnitude of the charging current that the secondary battery can receive maximum when the secondary battery is charged. For example, the processor 300 may determine a maximum charging current corresponding to each SOC section among the plurality of SOC sections. For example, the processor 300 may determine the maximum charging current of one section as 17A. In addition, the processor 300 may determine the maximum charging current of the two sections as 15A. In addition, the processor 300 may determine a maximum charge current of three sections as 10A. In addition, the processor 300 may determine a maximum charge current of four sections as 5A. In addition, the processor 300 may determine a maximum charging current of 5 sections as 2A. For example, the processor 300 may determine a maximum charging current corresponding to each SOC section based on the SOC and the temperature of the secondary battery. For example, the processor 300 may include an SOC section-maximum charging current table that defines a maximum charging current for each secondary battery SOC and temperature.

In addition, the processor 300 may estimate capacity of each SOC section among the 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 SOC, SOH, and temperature of the secondary battery. For example, the processor 300 may include an SOC section-capacity table defining capacities for SOC, SOH, and temperature of the secondary battery.

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

In addition, the processor 300 may estimate the charging time of the secondary battery based on the interval 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 apparatus according to an embodiment of the present invention may further include a memory device 400, as shown in the configuration of FIG.

The memory device 400 may store the SOC from the fully charged to the fully discharged of the secondary battery into a plurality of SOC sections based on the temperature of the secondary battery in advance. In addition, the memory device 400 may store a corresponding maximum charging current in advance for each SOC section stored in advance.

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

In addition, the memory device 400 may include a temperature-SOC section table that defines an SOC section for each temperature of the secondary battery. In addition, the memory device 400 may include an SOC section-maximum charging current table that defines a maximum charging current for each secondary battery SOC and temperature. In addition, the memory device 400 may include an SOC section-capacity table that defines capacities for SOC, SOH, and temperature of the secondary battery.

In addition, the memory device 400 may include an open voltage-remaining amount lookup table that defines a remaining amount for each open voltage of the secondary battery. In addition, the memory device 400 may include information necessary for calculating the estimated SOC by the monitoring unit 100 and the estimating unit 200. Here, the estimator 200 may estimate the remaining amount of the secondary battery using the open-voltage remaining amount lookup table. In addition, the memory device 400 may include an internal resistance-SOH lookup table that defines SOH for each internal resistance of the secondary battery.

Meanwhile, the processor 300 may include a processor 300, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, and / or data known in the art in order to perform the above-described operation. It may be implemented in a form that optionally includes a processing device.

On the other hand, 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 a RAM, a ROM, a register, a hard disk, an optical recording medium, or a magnetic recording medium. The memory device 400 may also be electrically connected to the processor 300, for example, via a data bus or the like so as to be accessible by the processor 300, respectively. The memory device 400 may also store and / or update and / or erase and / or transmit a program including various control logics that the processor 300 performs, and / or data generated when the control logic is executed. have.

2 is a diagram schematically illustrating a process of estimating a charging time by a charging time estimating apparatus according to an exemplary embodiment of the present invention.

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

Preferably, the charging time estimation apparatus according to an embodiment of the present invention, in step 310, determines the SOC interval of the secondary battery based on at least one or more of the SOC, SOH and temperature of the secondary battery, and lists the SOC interval can do. For example, as shown in Figure 2, the charging time estimation apparatus according to an embodiment of the present invention, can be arranged by dividing the SOC range from 0% to 100% into five SOC intervals from one section to five sections. have. In addition, the charging time estimation apparatus according to an embodiment of the present invention may estimate the capacity for each SOC section. For example, as shown in FIG. 2, the charging time estimating apparatus according to an embodiment of the present invention may estimate a capacity for each SOC section for five SOC sections from one section to five sections.

Also, in operation 320, the charging time estimating apparatus may determine the charging current of the secondary battery based on at least one of the temperature and the supply current of the secondary battery. Here, the supply current may mean the current charging current of the secondary battery received from the monitoring unit. For example, the charging time estimating apparatus according to an embodiment of the present invention may determine the charging current of the secondary battery based on the maximum charging current and the current charging current of each SOC section. For example, as shown in Figure 2, the charging time estimation apparatus according to an embodiment of the present invention, the charging current corresponding to each section 1 to 5 corresponding to the five SOC section from section 1 to section 5 Can be determined and listed.

Also, preferably, the charging time estimating apparatus according to an embodiment of the present invention may calculate the interval charging time by dividing the capacity for each SOC interval by a smaller value of the current charging current and the maximum charging current in step 330. . For example, the charging time estimating apparatus 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 one section to five sections. Each section charging time can be calculated.

More preferably, the charging time estimation apparatus according to an embodiment of the present invention, in step 330, by dividing the capacity for each SOC interval by the smaller value of the current charging current and the maximum charging current one-to-one corresponding to each SOC interval The charging time can be calculated. For example, the charging time estimation apparatus according to an embodiment of the present invention, five SOC intervals and five charging currents in one-to-one correspondence with respect to five SOC intervals from one section to five sections are currently charged for each interval. The charging time of each section can be calculated by dividing the capacity of each section by the smaller value of the current and the maximum charging current. For example, as shown in the drawing of FIG. 2, one section may correspond to one charging current. In addition, the two sections may correspond to two charging currents. In addition, the three sections may correspond to the three charging currents. In addition, four sections may correspond to four charging currents. In addition, five sections can correspond to five charging currents.

Also, preferably, in operation 340, the charging time estimating apparatus according to an embodiment of the present invention may estimate the charging time of the secondary battery by summing the charging time of each section.

<Equation 1>

Where 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 degeneration rate of the secondary battery, and I is the charging current of each SOC section. Can mean.

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

Also, preferably, in operation 350, the charging time estimating apparatus may transmit the charging time of the secondary battery to an external device. For example, the external device may be an ECU (Electronic Control Unit) of the vehicle.

3 is a graph showing a relationship between the maximum charging current and the SOC referred to by the charging time estimating apparatus according to the embodiment of the present invention.

Referring to FIG. 3, the charging time estimation apparatus according to an embodiment of the present invention may divide SOC in a range of 0% to 100% into five SOC sections from one section to five sections. For example, one section may mean an SOC section in the range of 0% to 60% SOC. In addition, the two sections may mean an SOC section in the range of 60% to 80% SOC. In addition, the three sections may mean an SOC section in the range of 80% to 90% SOC. In addition, four sections may mean an SOC section in the range of 90% to 97% SOC. In addition, 5 sections may mean an SOC section in the range of SOC 97% to 100%.

In addition, the charging time estimation apparatus according to an embodiment of the present invention may determine the maximum charging current for each SOC section. For example, the maximum charge current of one section may be 17A. In addition, the maximum charge current of the two sections may be 15A. In addition, the maximum charge current of the three sections may be 10A. In addition, the maximum charge current of the four sections may be 5A. In addition, the maximum charge current of five sections may be 2A.

In addition, the charging time estimating apparatus according to an embodiment of the present invention may 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 a smaller value between the maximum charging current and the current charging current of each SOC section. For example, in the situation A of the graph of FIG. 3, the maximum charge current of one section may be 17A and the current charge current may be 20A. In this case, the charging current in the A situation may be 17A. In addition, the charging time estimation apparatus according to an embodiment of the present invention may compare the current charging current with the maximum charging current in real time and determine a smaller value of the current charging current and the maximum charging current as the charging current.

In addition, the charging time estimation apparatus according to an embodiment of the present invention may estimate the capacity for each SOC section. For example, in the graph of FIG. 3, the capacity of one section may be 20 Ah since the capacity of one section has a range of 0 Ah to 20 Ah when the SOC has a range of 0% to 60%. have. In addition, since the capacity of the two sections has a range of 20Ah to 27Ah when the SOC has a range of 60% to 80%, the capacity of the two sections may be 7Ah. In addition, the capacity of the three sections may be 3Ah because the capacity of the three sections has a range of 27Ah to 30Ah when the SOC has a range of 80% to 90%. In addition, the capacity of 4 sections may be 3Ah because the capacity of 4 sections has a range of 30Ah to 33Ah when the SOC has a range of 90% to 97%. In addition, since the capacity of 5 sections has a range of 33Ah to 35Ah when the SOC has a range of 97% to 100%, the capacity of 5 sections may be 2Ah.

In addition, the charging time estimation apparatus according to an embodiment of the present invention may calculate the interval charging time by dividing the capacity for each SOC interval by the smaller value of the current charging current and the maximum charging current. For example, in the graph of FIG. 3, the charging time estimating apparatus according to the exemplary embodiment of the present invention may estimate the charging time until the secondary battery is fully charged at SOC 100% from point A of 30% SOC. have. 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 of one section may be a value obtained by dividing 10Ah, which is the remaining capacity of one section at point A, by 17A. In addition, the interval charging time between two sections may be a value obtained by dividing 7Ah, which is a capacity of two sections, by 15A. In addition, the interval charging time of the three sections may be a value obtained by dividing 3Ah, which is the capacity of the three sections, by 10A. In addition, the interval charging time of 4 sections may be a value obtained by dividing 3Ah, which is a capacity of 4 sections, by 5A. In addition, the interval charging time of 5 sections may be a value obtained by dividing 2A, which is a capacity of 5 sections, by 2A.

In addition, the charging time estimating apparatus according to the exemplary embodiment of the present disclosure may estimate the charging time of the secondary battery by summing the charging time of each section. For example, in the graph of FIG. 3, the section charging time of one section, the section charging time of two sections, the section charging time of three sections, the section charging time of four sections, and the section charging time of five sections are added together. The charging time can be estimated.

Through such a configuration, the charging time estimating apparatus 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 by charging the secondary battery, thereby correcting the accurate secondary battery. There is an advantage to estimate the charging time of.

Through such a configuration, the charging time estimating apparatus according to the exemplary embodiment of the present invention calculates the charging current of each SOC section by charging the secondary battery and changes the SOC value, thereby accurately charging the secondary battery. There is an advantage that can be estimated.

The apparatus for estimating battery charge time according to the present invention may be applied to a BMS. That is, the BMS according to the present invention may include the charging time estimating apparatus according to the present invention described above. In this configuration, at least some of the components of the charging time estimation apparatus according to the present invention may be implemented by supplementing or adding a function of the configuration included in the conventional BMS. For example, each component of the charging time estimating apparatus according to the present invention may be implemented as a component of a battery management system (BMS).

In addition, the charging time estimating apparatus 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 above-described charging time estimating apparatus according to the present invention. Here, the battery pack may include one or more secondary batteries, the charging time estimating apparatus, an electronic device (with BMS, a relay, a fuse, etc.), a case, and the like.

4 is a flowchart schematically showing a charging time estimation method according to an embodiment of the present invention. In FIG. 4, the performing agent of each step may be referred to as each component of the charging time estimating apparatus 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 S110 for each SOC section, and a charging time estimation step S120.

First, in the measuring step (S100), at least one or more of the voltage, current and temperature of the secondary battery can be measured. Subsequently, in the SOC interval estimating step (S110), at least one or more of the voltage, current, and temperature of the secondary battery measured by the measuring step are received, and at least one of the voltage, current, and temperature of the secondary battery. Based on the above, the SOC of the secondary battery can be estimated. Further, based on at least one or more of the temperature value and the SOC value of the secondary battery, SOCs from full charge to full discharge are 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. Subsequently, in the charging time estimating step (S120), 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 estimating the charging time of the secondary battery based on the section charging time. Can be.

Preferably, in the charging time estimation step (S120) according to an embodiment of the present disclosure, the interval charging time may be calculated by dividing the capacity for each SOC interval by a smaller value 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 disclosure, the charging time of the secondary battery may be estimated by summing the charging time of each section.

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

Preferably, in the SOC estimating step (S110) according to an embodiment of the present disclosure, 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 may be estimated based on at least one of the above.

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

In addition, when the control logic is implemented in software, the processor may be implemented in a set of program modules. In this case, the program module may be stored in the memory device and executed by the processor.

In addition, various control logics of the processor may be combined with at least one, and the combined control logics may be written in a computer readable code system so that the computer readable access is not limited in kind. In one example, the recording medium includes at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device. In addition, the code system may be distributed and stored and executed in a networked computer. In addition, functional programs, code, and segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims to be described.

10: cell assembly
30: external device
50: vehicle load
100: monitoring unit
110: current sensor
200: estimator
300: processor
400: memory device

Claims (11)

In the apparatus 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 estimator configured to receive at least one or more of the voltage and current of the secondary battery from the monitoring unit, and estimate an SOC of the secondary battery based on at least one or more of the voltage and current of the secondary battery; And
Receives the current charge current of the secondary battery from the monitoring unit, receives the SOC of the secondary battery from the estimator, and divides the SOC from full charge to full discharge based on the SOC divided into a plurality of SOC intervals Determine a corresponding maximum charging current for each SOC section, estimate a capacity for each SOC section, calculate a 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 a charging time of the secondary battery based on an interval charging time
Charging time estimation apparatus comprising a.
The method of claim 1,
The monitoring unit is configured to measure at least one of voltage, current and temperature,
The estimating unit receives at least one or more 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 or more of the voltage, current and temperature of the secondary battery,
The processor receives at least one or more of the current charging current and the temperature of the secondary battery from the monitoring unit, and the SOC from the full charge to the full discharge based on at least one or more of the SOC and the temperature of the plurality of SOC intervals Charging time estimation apparatus, characterized in that divided by the.
The method of claim 1,
And the processor calculates the interval charging time by dividing the capacity for each SOC interval by a smaller value of the current charge current and the maximum charge current.
The method of claim 3,
The processor is configured to estimate the charging time of the secondary battery by adding the charge time of each section, characterized in that the charging time estimation apparatus.
The method of claim 3,
And the processor is configured to calculate the interval charging time by dividing the capacity for each SOC interval by a smaller value of the current charging current and the maximum charging current corresponding one-to-one to each SOC interval.
The method of claim 1,
The estimator is configured to receive at least one or more 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 or more of the voltage, current and temperature of the secondary battery. Charging time estimation device, characterized in that.
The method of claim 6,
The processor may be configured to receive the SOH value of the secondary battery from the monitoring unit, and determine the SOC interval by multiplying the SOH value of the secondary battery by the SOC interval corresponding to a current temperature value of the secondary battery. Charge time estimation apparatus.
The method of claim 1,
A memory device configured to store in advance a SOC from full charge to full discharge of the secondary battery into a plurality of SOC sections based on the temperature of the secondary battery, and prestore a corresponding maximum charging current for each prestored SOC section.
Charging time estimation apparatus further comprises.
A BMS comprising a charging time estimating apparatus according to any one of claims 1 to 8.
A battery pack comprising a charging time estimating apparatus according to any one of claims 1 to 8.
In the 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 or more of the voltage, current and temperature of the secondary battery measured by the measuring step, and estimate the SOC of the secondary battery based on at least one or more of the voltage, current and temperature of the secondary battery, Based on at least one of the temperature value and the SOC value of the secondary battery, SOCs from full charge to full discharge are divided into a plurality of SOC sections, and the corresponding maximum charging current is determined for each SOC section, and each SOC section Estimating the star dose; And
Calculating a section charging time by dividing the capacity for each SOC section by a current charging current or the maximum charging current, and estimating a charging time of the secondary battery based on the section charging time.
Charging time estimation method comprising a.

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