Electronic device, and method for determining fast charging pattern of battery cell

Abstract

Disclosed are a method for determining a fast charging pattern of a battery cell and an electronic device performing same, the method comprising the steps of: setting charging conditions including a charging current set including a plurality of charging currents of a battery cell, a total charging capacity of the battery cell, and a total charging duration of the battery cell; determining a first set of individual charging durations including a plurality of individual charging durations respectively corresponding to the plurality of charging currents satisfying the charging conditions; determining a charging sequence of the plurality of charging currents corresponding to the first set of individual charging durations; determining, on the basis of the charging sequence of the plurality of charging currents, a second set of individual charging durations including a plurality of individual charging durations in which an increase in voltage of the battery cell after charging is minimized; and determining the charging sequence and the second set of individual charging durations as a fast charging pattern of the battery cell.

Description

Method for Determining Rapid Charging Patterns of Electronic Devices and Battery Cells

[0001] The present disclosure relates to a method for determining a rapid charging pattern of a battery cell and an electronic device for performing the same.

[0002] As lithium-ion battery usage environments diversify, the importance of rapid charging technology is increasing. This allows users to quickly complete a charge and operate the battery without having to wait for a long time for charging. The core of rapid charging technology for lithium-ion batteries lies in high efficiency and stability. Ongoing research is being conducted to find ways to charge batteries faster than conventional charging methods while minimizing issues such as heat generation and shortened battery life. Based on results obtained through three-electrode experiments, rapid charging technology for lithium-ion batteries primarily focuses on charging batteries at high currents first, then gradually reducing the current. Research is also underway on more optimized rapid charging methods.

[0003] The disclosed embodiments provide a method for determining a charging pattern of a battery cell and an electronic device for performing the same. Specifically, the purpose is to search for and provide a charging pattern for rapid charging that minimizes battery cell degradation through a single rapid charge when limited rapid charging conditions are present, i.e., a plurality of charging currents used for rapid charging of a battery cell, a total charging capacity of the battery cell, and a total charging time of the battery cell are limited.

[0004] The technical task to be achieved by this embodiment is not limited to the technical task described above, and other technical tasks can be inferred from the following embodiments.

[0005] A method for determining a rapid charging pattern of a battery cell performed by an electronic device according to one embodiment may include: setting a charging current set including a plurality of charging currents of the battery cell, a charging condition including a total charging capacity of the battery cell, and a total charging time of the battery cell; determining a first individual charging time set including a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the charging condition; determining a charging order of the plurality of charging currents corresponding to the first individual charging time set; determining a second individual charging time set including the plurality of individual charging times at which a voltage increase of the battery cell after charging is minimized based on the charging order of the plurality of charging currents; and determining the charging order and the second individual charging time set as a rapid charging pattern of the battery cell.

[0006] The step of determining the first individual charging time set may include the step of obtaining a plurality of individual charging time sets such that the sum of the products of specific charging currents included in the charging currents of the battery cells and specific charging times corresponding to the specific charging currents is equal to the total charging capacity of the battery cells, and the sum of all the specific charging times is equal to the total charging time of the battery cells; and the step of determining, as the first individual charging time set, an individual charging time set corresponding to a case in which the number of times the negative voltage of the battery cell satisfies the threshold voltage during the entire charging process among the plurality of individual charging time sets is the minimum.

[0007] The step of determining the charging order may include a step of determining the charging order in the order of the charging current sets corresponding to the number of times the negative voltage of the battery cell satisfies the threshold voltage during the entire charging process according to the charging current values ​​corresponding to the first individual charging time set.

[0008] A method for determining a rapid charging pattern of a battery cell performed by an electronic device according to one embodiment may further include a step of obtaining information about a capacity degradation of the battery cell and information about an increase in internal resistance of the battery cell after charging according to the rapid charging pattern of the battery cell is performed.

[0009] In one embodiment, a method for determining a rapid charging pattern of a battery cell performed by an electronic device may further include the steps of: setting a charging current set including a plurality of charging currents of a battery cell after charging is performed, a charging condition including a total charging capacity of the battery cell after the charging is performed, and a total charging time of the battery cell after the charging is performed, based on information about a degree of capacity degradation of the battery cell and information about an increase in internal resistance of the battery cell; determining a third individual charging time set including a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the charging condition; determining a charging order of the plurality of charging currents corresponding to the third individual charging time set; determining a fourth individual charging time set including the plurality of individual charging times and a charging voltage of the battery cell after the charging is performed, based on the charging order of the plurality of charging currents; and determining the charging order and the fourth individual charging time set as a rapid charging pattern of the battery cell after the charging is performed.

[0010] The step of setting the charging conditions may include the step of generating a matrix having the values ​​of the plurality of charging currents as components and a matrix having the values ​​of the total charging capacity and the values ​​of the total charging time as components, and the step of determining the first charging current sets may include the step of arbitrarily changing the order of each component of the matrix having the plurality of charging current values ​​as components, and determining the first charging current sets including a plurality of individual charging times corresponding to each of the changed order of charging currents.

[0011] Each of the plurality of charging currents included in the above charging current set may have different values.

[0012] The charging condition may be determined based on at least one of an internal temperature of the battery cell, an initial SoC of the battery cell, and an internal resistance of the battery cell.

[0013] An electronic device for performing a method for determining a rapid charging pattern of a battery cell according to one embodiment includes a memory for storing instructions; and a processor connected to the memory, wherein the processor is configured to set a charging current set including a plurality of charging currents of the battery cell, a charging condition including a total charging capacity of the battery cell and a total charging time of the battery cell, determine a first individual charging time set including a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the charging condition, determine a charging order of the plurality of charging currents corresponding to the first individual charging time set, determine a second individual charging time set including the plurality of individual charging times at which a charging voltage of the battery cell becomes minimum based on the charging order of the plurality of charging currents, and determine the charging order and the second individual charging time set as a rapid charging pattern of the battery cell.

[0014] Specific details of other embodiments are included in the detailed description and drawings.

[0015] According to the proposed embodiment, one or more of the following effects can be expected.

[0016] According to an embodiment of the present specification, a set of charging currents including a plurality of charging currents of a battery cell, a total charging capacity of a battery cell, and a plurality of individual charging times satisfying a charging condition including a total charging time of the battery cell can be obtained.

[0017] In addition, according to the embodiment of the present specification, it is possible to determine an optimal rapid charging current pattern that can minimize the decrease in negative voltage due to rapid charging of the battery cell, thereby reducing the decrease in lifespan and degradation due to rapid charging of the battery cell.

[0018] In addition, according to the embodiment of the present specification, information on capacity degradation of a battery cell and information on increase in internal resistance after rapid charging is completed can be obtained, and an optimal rapid charging current pattern according to the specifications of the changed battery cell can be continuously reflected.

[0019] The effects of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0020] FIG. 1 illustrates the interlocking relationships of electronic devices that determine a rapid charging pattern of a battery cell according to one embodiment.

[0021] FIG. 2 is a flowchart of a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0022] FIGS. 3A and 3B are drawings for explaining a step of determining first individual charging time sets in a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0023] FIGS. 4A and 4B are drawings for explaining a step of determining a charging order of multiple charging currents in a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0024] FIGS. 5A and 5B are drawings for explaining a step of determining a charging sequence and a second individual charging time set as a rapid charging pattern of a battery cell in a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0025] FIGS. 6A to 6C are drawings for explaining the effect of a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0026] FIG. 7 is a block diagram illustrating the configuration of an electronic device that determines a rapid charging pattern of a battery cell according to one embodiment.

[0027] The terms used in the embodiments have been selected from widely used and common terms, taking into account the functions of the present disclosure. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, in which case their meanings will be described in detail in the relevant description. Therefore, the terms used in this disclosure should not be defined simply as names of terms, but rather based on the meanings of the terms and the overall content of the present disclosure.

[0028] When a part of a specification is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0029] The expression "at least one of a, b, and c" described throughout the specification may encompass 'a alone', 'b alone', 'c alone', 'a and b', 'a and c', 'b and c', or 'all of a, b, and c'.

[0030] The "terminal" mentioned below may be implemented as a computer or portable terminal that can connect to a server or other terminal via a network. Here, the computer includes, for example, a notebook, desktop, laptop, etc. equipped with a web browser, and the portable terminal may include, for example, a wireless communication device that guarantees portability and mobility, and may include all types of handheld-based wireless communication devices such as communication-based terminals such as IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), LTE (Long Term Evolution), smartphones, tablet PCs, etc.

[0031] Below, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein.

[0032] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0033]

[0034] FIG. 1 illustrates the interlocking relationships of electronic devices that determine the impedance of a target battery cell according to one embodiment.

[0035] Referring to FIG. 1, an electronic device (100) may operate in conjunction with a battery management device (200) that manages a battery cell (300). At this time, the battery cell (300) may include a battery cell that is subject to rapid charging. Meanwhile, FIG. 1 only illustrates components related to the present embodiment. Therefore, those skilled in the art will understand that, in addition to the components illustrated in FIG. 1, other general-purpose components may also be included.

[0036] The electronic device (100) is a device that configures and provides various information. The electronic device (100) can set charging conditions for rapid charging of a battery cell, perform various operations to determine a first individual charging time set that satisfies a specific condition among a plurality of individual charging time sets corresponding to each of a plurality of charging currents that satisfy the charging conditions, perform a simulation to determine an optimal charging time corresponding to the first individual charging time set, and provide the results. In addition, the electronic device (100) can additionally perform a simulation on the charging results according to a plurality of individual charging time sets that satisfy the charging conditions when the determined optimal charging time is fixed, and additionally perform various operations to determine a second individual charging time set that satisfies a specific condition among the plurality of individual charging time sets. Through this, the electronic device (100) can perform the entire process of determining a rapid charging pattern by considering the conditions of a specific battery cell.

[0037] The battery management device (200) may include one or more sensors for measuring parameters such as current, voltage, initial SoC, internal resistance, and internal temperature of the battery cell (300), and may include a memory and a processor (not shown) for various operations. That is, the battery management device (200) operates based on the memory and processor similarly to the electronic device (100), but additionally includes a sensor to measure and calculate the parameters of the battery cell (300). In addition, the battery management device (200) may similarly perform the overall calculations and simulations performed by the electronic device (100), as briefly described above.

[0038] Here, the electronic device (100) and the battery management device (200) may be completely separate and independent entities, or they may exist only conceptually separated within a single device or system. That is, a single computing device equipped with a control function for battery cells may perform all of the functions of the electronic device (100) and the battery management device (200) described below, and therefore, such an embodiment is also considered to fall within the scope of the present disclosure.

[0039] Hereinafter, a battery analysis method according to an embodiment of the present disclosure will be described with reference to FIG. 2.

[0040]

[0041] FIG. 2 is a flowchart of a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0042] Referring to FIG. 2, an electronic device (100) according to an embodiment may set a charging current set including a plurality of charging currents of a battery cell, a charging condition including a total charging capacity of the battery cell, and a total charging time of the battery cell in step S210. In this case, the charging condition may be determined based on at least one of an internal temperature of the battery cell, an initial SoC of the battery cell, and an internal resistance of the battery cell, and may also be determined based on electrochemical parameters according to an electrochemical simulation on another cloud battery management device or an on-board battery management device. Each of a charging current set including a plurality of charging currents of the battery cell, a total charging capacity of the battery cell, and a total charging time of the battery cell may be determined based on a user's requirement for using the battery cell. An electronic device (100) according to an embodiment may generate a matrix having as components values ​​of a plurality of charging currents and a matrix having as components values ​​of a total charging capacity and values ​​of a total charging time. In this case, a row or column having as components values ​​of a plurality of charging currents may correspond to a charging current set. In this case, a row or column whose components are the values ​​of multiple individual charging times corresponding to each of multiple charging currents may correspond to a set of individual charging times. In this case, each of the multiple charging currents included in the set of charging currents may have different values. Furthermore, the number of multiple charging currents included in the set of multiple charging currents and the number of individual charging times may be the same.

[0043] In one embodiment, the electronic device (100) may determine first individual charging time sets including a plurality of individual charging times corresponding to each of a plurality of charging currents that satisfy a charging condition in step S220. The electronic device (100) may obtain a plurality of individual charging time sets such that the sum of the product of a specific charging current included in the charging currents of the battery cells in step S220 and a specific charging time corresponding to the specific charging current is equal to the total charging capacity of the battery cells, and the sum of the specific charging times is equal to the total charging time of the battery cells.

[0044] In this case, a set of charging currents including a plurality of charging currents, a first set of individual charging times including a plurality of individual charging times corresponding to each of the plurality of charging currents according to the total charging capacity of the battery cell and the total charging time of the battery cell can be determined based on the following mathematical expression 1.

[0045]

[0046] In this case, i1 to in may correspond to each of a plurality of charging currents, x1 to xn may correspond to each of a plurality of individual charging times corresponding to each of a plurality of charging currents, Q may correspond to the total charging capacity of the battery cell, and T may correspond to the total charging time of the battery cell. In other words, the number of each of the plurality of charging currents and the number of each of the plurality of individual charging times may be the same. In this case, the first row of the first matrix on the left side of mathematical expression 1 may correspond to a set of charging currents corresponding to a row whose components include the values ​​of the plurality of charging currents. In this case, the first column of the second matrix on the left side of mathematical expression 1 may correspond to a set of individual charging times corresponding to a column whose components include the values ​​of the plurality of individual charging times corresponding to each of the plurality of charging currents. For example, in the case of mathematical expression 1, the number of unknowns x1 to xn is n (e.g., n is a natural number exceeding 2), and the number of formulas is 2, namely, a formula for the total charge capacity of the battery cell and a formula for the total charge time of the battery cell. Therefore, the values ​​of x1 to xn that satisfy mathematical expression 1 can be infinitely many under the condition that the values ​​of x1 to xn are positive numbers. In order to determine a set of charging currents that serve as a reference for optimization, the electronic device (100) according to one embodiment can arbitrarily determine the order of each element of a matrix whose components are a plurality of charging current values ​​in step S220. The electronic device (100) can obtain any particular solution that satisfies the matrix relationship of mathematical expression 1, obtain a homogeneous solution according to the null space of the first matrix on the left side of mathematical expression 1, and then obtain a complete solution through a linear combination of any particular solution and the general solution.The electronic device (100) can arbitrarily determine the order of each element of the matrix as above, and repeat the process of obtaining the general solution, the special solution, and the complete solution a critical number of times (e.g., 100,000 times) or more to determine a critical number of solutions (e.g., 100,000). In other words, the electronic device (100) according to one embodiment can determine a critical number or more of individual charging time sets including a plurality of individual charging times corresponding to each of a plurality of charging currents in step S220. The electronic device (100) according to one embodiment can perform rapid charging for a plurality of individual charging times corresponding to each of the plurality of charging currents obtained in step S220, and then determine an individual charging time set corresponding to a case where the number of times that the negative voltage of the battery cell satisfies the critical voltage (e.g., 0 V) ​​is the minimum as a first individual charging time set.

[0047] For example, when rapidly charging a battery cell, charging currents of 5.2A, 4.8A, 4.32A, 3.84A, 3.36A, 2.88A, 2.4 A, 1.92 A, and 1.44 A are used to charge the total charging capacity of 13306Q, but the total charging time, which is the sum of the individual charging times corresponding to each charging current, is 3600 (s), and the above mathematical expression 1 can be expressed as the following mathematical expression 2.

[0048]

[0049] Through the process in step S220, the individual charge sets of unknown numbers x1 to xn that satisfy mathematical expression 2 can be determined as in mathematical expression 3 below.

[0050]

[0051]

[0052] For another example, if the electronic device (100) arbitrarily determines the order of each element of a matrix having multiple charging current values ​​as elements, the above mathematical expression 1 can be expressed as the following mathematical expression 4.

[0053]

[0054] Through the process in step S220, the individual charge sets of unknowns x1 to xn that satisfy mathematical expression 4 can be determined as in mathematical expression 5 below.

[0055]

[0056] In this case, both the two different matrices (X1 and X2) on the left side of Equation 3 and the two different matrices (X3 and X4) on the left side of Equation 5 may correspond to individual charging time sets. However, the case of the matrices having multiple charging current values ​​as components in Equations 2 to 5 is merely exemplary, and when a total of 9 charging currents are used for charging, there can be 9! matrices, and the individual charging time sets that satisfy this can be innumerable. The process of determining the first individual charging time set among the mentioned individual charging time sets will be specifically examined in FIGS. 3a and 3b below.

[0057] In one embodiment, the electronic device (100) may determine a charging order of a plurality of charging currents corresponding to a first individual charging time set in step S230. For example, even in a case where charging is performed for each of the same plurality of charging currents and for a plurality of individual charging times corresponding thereto, the efficiency of rapid charging of the battery cell may vary depending on which charging current is used for rapid charging and in what order, and the electronic device (100) may determine a charging order of the battery cell having an optimal efficiency in step S230. In this case, the number of cases of the entire charging order may be defined as n! when the number of multiple charging currents is n. In step S230, the electronic device (100) may maintain the first individual charging time set the same, arbitrarily change the charging order of the plurality of charging currents, perform rapid charging for a plurality of individual charging times corresponding to each of the plurality of charging currents, and then determine a charging order corresponding to a case where the number of times the negative voltage of the battery cell satisfies a threshold voltage (e.g., 0 V) ​​is the minimum.

[0058] In one embodiment, the electronic device (100) may determine, in step S240, a second individual charging time set including a plurality of individual charging times at which the voltage increase of the battery cell after charging is minimized, based on the charging order of the plurality of charging currents. For example, the electronic device (100) may perform charging by changing only the plurality of individual charging times corresponding to each of the plurality of charging currents while maintaining the charging order determined in the preceding step S230, and may determine, in one embodiment, a second individual charging time set including a plurality of individual charging times at which the voltage increase of the battery cell after charging is minimized so that the negative voltage of the battery cell drops the least below 0 V with respect to the Li reference potential at which lithium plating occurs, based on the charging order of the plurality of charging currents. In addition, for example, the electronic device (100) may determine, in one embodiment, a second individual charging time set including a plurality of individual charging times at which the voltage increase of the battery cell after charging is minimized. When the decrease in the negative voltage of the battery cell after charging is minimal or when the increase in the positive voltage of the battery cell after charging is minimal, the electronic device (100) according to one embodiment may determine a second individual charging time set corresponding to the case where the voltage increase of the battery cell after charging is less than the threshold voltage. In this case, the second individual charging time set is typically different from the first individual charging time set examined in step s220 above, but the second individual charging time set including the individual charging time at which the voltage increase of the battery cell after charging is minimal based on the charging order determined based on the first individual charging time set may be the same as the first individual charging time set.

[0059] In one embodiment, the electronic device (100) may determine a charging sequence and a second individual charging time set as a rapid charging pattern of the battery cell in step S250. In one embodiment, the electronic device (100) may determine a rapid charging pattern of the battery cell by using a plurality of individual charging times included in the second individual charging time set to charge the battery cell so as to correspond to the charging sequence of each of the plurality of charging currents determined in step S230. In one embodiment, the electronic device (100) may further perform an operation of acquiring information about a capacity degradation of the battery cell and information about an increase in the internal resistance of the battery cell after charging according to the rapid charging pattern of the battery cell is performed. Thereafter, the electronic device may perform the above operations to determine a rapid charging pattern suitable for the specifications of the battery cell that have changed after the rapid charging of the battery cell. In other words, the electronic device (100) according to one embodiment may set a charging condition including a charging current set including a plurality of charging currents of the battery cell after charging is performed, a total charging capacity of the battery cell after charging, and a total charging time of the battery cell after charging is performed, based on information about a capacity degradation degree of the battery cell and information about an increase in the internal resistance of the battery cell. The electronic device (100) according to one embodiment may determine a third individual charging time set including a plurality of individual charging times corresponding to each of a plurality of charging currents that satisfy the charging condition, determine a charging order of the plurality of charging currents corresponding to the third individual charging time set, determine a fourth individual charging time set including a plurality of individual charging times and a charging voltage of the battery cell after charging is performed based on the charging order of the plurality of charging currents, and determine the charging order and the fourth individual charging time set as a rapid charging pattern of the battery cell after charging is performed.Through this process, the electronic device (100) determines, for example, based on information about the capacity degradation of the battery cell, that the capacity degradation of the battery cell has increased by a critical ratio (e.g., 5%) compared to before, or based on information about the increase in the internal resistance of the battery cell, that the internal resistance of the battery cell has increased by a critical ratio (e.g., 10%), and can appropriately determine a rapid charging pattern for rapid charging according to the specifications of the changed battery cell at the beginning of life (BOL), middle of life (MOL), and end of life (EOL) of the battery.

[0060] FIGS. 3A and 3B are diagrams illustrating a step of determining first individual charging time sets in a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0061] Referring to FIG. 3A in relation to step S220 examined in FIG. 2 above, a graph chart (301) of charging current according to time and a graph chart (302) of charging current according to SoC of the battery cell can be confirmed when rapid charging of the battery cell is performed according to each of a plurality of individual charging time sets including individual charging time sets X1 to X4 as in the previous example. The graphs (311) included in the graph chart (301) of charging current and the graphs (312) included in the graph chart (302) of charging current according to SoC of the battery cell represent a case where the charging order of the plurality of charging currents is randomly set and charging is performed according to a plurality of individual charging times corresponding to each of the plurality of charging currents, and in this case, the total time required from the SoC when rapid charging was first started to the SoC when rapid charging was ended and the total charged charge capacity may be the same for all graphs included in the graphs (311, 312).

[0062] Referring to FIG. 3B, a graph chart (303) of the anode voltage according to the SoC of the battery cell until the rapid charging is completed can be confirmed. The electronic device (100) according to an embodiment may determine, as a first individual charging time set, an individual charging time set corresponding to the case where the number of times the anode voltage of the battery cell satisfies the threshold voltage during the entire charging process is the minimum among a plurality of individual charging time sets. Since the more overcharging occurs during rapid charging of the battery cell, the greater the decrease in the anode voltage and the greater the degree of battery degradation, the electronic device (100) according to an embodiment may determine, as a first individual charging time set, an individual charging time set corresponding to the number of times the anode voltage violates the threshold voltage (e.g., 0 V) ​​during the entire charging process among the individual charging time sets. For example, as shown in the chart (304) of the number of contacts with the threshold voltage according to the individual charging current set of FIG. 3B, when charging is performed with the individual charging time set (314) among the entire individual charging time sets, it can be confirmed that the number of contacts (violation number) with the threshold voltage of the negative voltage is the minimum. Accordingly, the electronic device (100) according to one embodiment can determine the individual charging time set (314) as the first individual charging time set. Thereafter, the electronic device (100) can determine the order of the charging current when charging is performed according to the individual charging time set (314).

[0063]

[0064] FIGS. 4A and 4B are diagrams for explaining a step of determining a charging order of a plurality of charging currents in a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0065] Referring to FIG. 4A in relation to step S230 and FIG. 3B examined in FIG. 2 above, a graph chart (401) of charging current over time and a graph chart (402) of charging current according to SoC of the battery cell can be confirmed when rapid charging of the battery cell is performed according to the individual charging time set (314), which is the first individual charging time set determined as in the previous example. The graphs (411) included in the graph chart (401) of charging current over time and the graphs (412) included in the graph chart (402) of charging current according to SoC of the battery cell can represent a case where charging is performed with a corresponding charging current according to the individual charging time set (314), which is the first individual charging time set as in the previous example, but the order of the corresponding charging currents is arbitrarily changed, and in this case, the total time required from the SoC when rapid charging was first started to the SoC when rapid charging was ended and the total charged charge capacity can be the same for all graphs.

[0066] Referring to FIG. 4B, the electronic device (100) according to one embodiment may determine the charging order in the order of the charging current set corresponding to the case where the number of times the negative voltage of the battery cell satisfies the threshold voltage during the entire charging process according to the charging current value corresponding to the first individual charging time set is the minimum. For example, the electronic device (100) according to one embodiment may determine the charging order of the plurality of charging currents in which the number of times the negative voltage contacts (violates) the threshold voltage (e.g., 0 V) ​​during the entire charging process is the minimum among the plurality of charging order cases. For example, as shown in the limited chart (403) of FIG. 4B, when charging is performed in the charging order case (413) among the entire charging order cases, it can be confirmed that the number of times the negative voltage contacts the threshold voltage (violation number) is the minimum. Therefore, the electronic device (100) according to one embodiment may determine the charging order in the order of the charging current set corresponding to the charging order case (413).

[0067]

[0068] FIGS. 5A and 5B are diagrams for explaining a step of determining a charging sequence and a second individual charging time set as a rapid charging pattern of a battery cell in a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0069] Referring to FIG. 5A in relation to step S240 and FIG. 4B discussed above in FIG. 2, a graph chart (501) of charging current over time and a graph chart (502) of charging current according to SoC of the battery cell can be confirmed when rapid charging of the battery cell is performed according to the charging order case (413) determined as in the previous example. The graphs (511) included in the graph chart (501) of charging current over time and the graphs (512) included in the graph chart (502) of charging current according to SoC of the battery cell can represent a case in which charging is performed in the order of charging current according to the charging order case (413) as in the previous example, but individual charging times corresponding to each of a plurality of charging currents are arbitrarily changed, and in this case, the total time required from the SoC when rapid charging was first started to the SoC when rapid charging was ended and the total charged charge capacity can be the same for all graphs.

[0070] Referring to FIG. 5B, the electronic device (100) according to one embodiment may determine the individual charging time set that minimizes the increase in battery cell voltage during the entire charging process after rapid charging according to the charging order based on the charging order case (413) is completed, as a second individual charging time set. For example, as shown in the limited chart (503) of FIG. 5B, when rapid charging is performed with a plurality of individual charging times corresponding to each of a plurality of charging currents according to the charging order based on the charging order case (413), a graph (514) showing the lowest increase in battery cell voltage can be confirmed. The lowest increase in battery cell voltage after rapid charging means that the degree of decrease in the negative voltage of the battery cell after rapid charging is the lowest, which means that the battery degradation has occurred the least, and therefore, the electronic device (100) may determine the individual charging time set used in the graph (514) as the second individual charging time set. Thereafter, the electronic device (100) can determine a charging sequence and a second individual charging time set based on the previously determined charging sequence case (413) as a rapid charging pattern of the battery cells.

[0071]

[0072] FIGS. 6A to 6C are diagrams illustrating the effect of a method for determining a rapid charging pattern of a battery cell according to one embodiment.

[0073] Referring to FIG. 6A, an electronic device (100) according to an embodiment can determine a rapid charging pattern through the process described above. A graph chart (601) of the negative voltage of a battery cell according to SoC and a graph chart (602) of the negative voltage of a battery cell according to SoC can be confirmed when rapid charging is performed according to the rapid charging pattern.

[0074] Comparing the first rapid charge pattern graph (611) and the second rapid charge pattern graph (621) included in the graph chart (601) of the cathode voltage of the battery cell, it can be seen that in the case of the second rapid charge pattern graph (621), as the SoC increases through rapid charging, the number of times the cathode voltage comes into contact with the threshold voltage described above is smaller, and the decrease in the cathode voltage throughout the entire charging process is smaller compared to the first rapid charge pattern graph (611). In addition, comparing the first rapid charge pattern graph (612) and the second rapid charge pattern graph (622) included in the graph chart (602) of the cathode voltage of the battery cell, it can be seen that in the case of the second rapid charge pattern graph (622), as the SoC increases through rapid charging, the increase in the cathode voltage throughout the entire charging process is smaller compared to the first rapid charge pattern graph (612). Through this, it can be confirmed that the degree of increase in battery cell voltage is less when following the second rapid charging pattern than when following the first rapid charging pattern, and it can be confirmed that the second rapid charging pattern is a rapid charging pattern that is closer to optimization than the first rapid charging pattern.

[0075] Referring to FIG. 6B, a graph chart (603) of a charging current according to the SoC of a battery cell and a graph chart (604) of a voltage of a battery cell according to the SoC can be confirmed when performing rapid charging according to a determined rapid charging pattern according to an embodiment. A first rapid charging pattern graph (613), a second rapid charging pattern graph (623), and a general rapid charging pattern graph (633) included in the graph chart (603) of a charging current according to the SoC of a battery cell can be confirmed, and a voltage change graph (614) of a battery cell according to the first rapid charging pattern, a voltage change graph (624) of a battery cell according to the second rapid charging pattern, and a voltage change graph (634) of a battery cell according to the general pattern can be compared, included in the graph chart (604) of a voltage of a battery cell according to the SoC. In this case, when charging is performed according to a general rapid charging pattern, it takes about 21.6 minutes, but when charging is performed according to the method proposed in the present invention, it may take about 19.3 minutes for the entire charging process, and when examining the voltage change graph (624) of the battery cell according to the second rapid charging pattern, it can be confirmed that the voltage increase of the battery cell is less compared to other graphs (614) and (634).

[0076] Referring to Fig. 6c, a chart (605) regarding capacity retention according to the number of charging repetitions of a rapid charging pattern can be confirmed. When comparing a graph (615) according to a second rapid charging pattern and a graph (625) according to a normal charging pattern included in the chart (605) regarding capacity retention according to the number of charging repetitions of a rapid charging pattern, it can be confirmed that the degree of decrease in the capacity retention of a battery cell according to the same number of charging repetitions is less in the case of the graph (615) according to the second rapid charging pattern than in the graph (625) according to the normal charging pattern.

[0077]

[0078] FIG. 7 is a block diagram showing the configuration of an electronic device for determining the impedance of a battery cell according to one embodiment.

[0079] FIG. 7 illustrates a block diagram of an electronic device according to an embodiment. The electronic device (100) may include a memory (101) and a processor (102), according to an embodiment. The electronic device (100) illustrated in FIG. 7 only illustrates components related to the present embodiment. Therefore, it will be understood by those skilled in the art related to the present embodiment that other general components may be included in addition to the components illustrated in FIG. 7.

[0080] According to an embodiment, a memory (101) is hardware that stores various data processed within an electronic device (100). The memory (101) is located within a processor (102) of the electronic device (100) and can store data processed and data to be processed through the processor (102). In addition, the memory can store basic programming and data structures that can provide functions of at least one embodiment of the present disclosure, as well as applications (programs, code modules, instructions), drivers, etc. that can provide functions of the embodiments of the present disclosure. The memory may include random access memory (RAM) such as dynamic random access memory (DRAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD-ROM, Blu-ray or other optical disk storage, hard disk drive (HDD), solid state drive (SSD), or flash memory, but is not limited to the specific cases mentioned in the embodiments according to the present disclosure.

[0081] In one embodiment, the processor (102) may be included in a controller. The processor (102) may control the overall operation of the electronic device (100) and process data and signals. The processor (102) may be composed of at least one hardware unit. In addition, the processor (102) may operate by one or more software modules generated by executing program codes stored in the memory (101). The processor (102) may include a memory, and the processor (102) may control the overall operation of the electronic device (100) and process data and signals by executing program codes stored in the memory.

[0082] In one embodiment, the processor (102) may be configured to set a charging current set including a plurality of charging currents of a battery cell, a charging condition including a total charging capacity of the battery cell and a total charging time of the battery cell, determine a first individual charging time set including a plurality of individual charging times corresponding to each of a plurality of charging currents satisfying the charging condition, determine a charging order of the plurality of charging currents corresponding to the first individual charging time set, determine a second individual charging time set including a plurality of individual charging times at which a voltage increase of the battery cell is minimized based on the charging order of the plurality of charging currents, and determine the charging order and the second individual charging time set as a rapid charging pattern of the battery cell.

[0083] In one embodiment, the processor (102) may be configured to perform an operation of determining a charging order in the order of a set of charging currents corresponding to a first individual charging time set, in which the number of times the negative voltage of the battery cell satisfies the threshold voltage during the entire charging process according to the charging current value corresponding to the first individual charging time set is the minimum.

[0084] According to one embodiment, the processor (102) may be further configured to perform an operation of acquiring information about a capacity degradation of the battery cell and information about an increase in internal resistance of the battery cell after charging according to a rapid charging pattern of the battery cell is performed.

[0085] In one embodiment, the processor (102) may be further configured to perform an operation of setting a charging current set including a plurality of charging currents of the battery cell after charging is performed, a charging condition including a total charging capacity of the battery cell after charging is performed, and a total charging time of the battery cell after charging is performed, based on information about a capacity degradation degree of the battery cell and information about an increase in internal resistance of the battery cell, determining a third individual charging time set including a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the charging condition, determining a charging order of the plurality of charging currents corresponding to the third individual charging time set, determining a fourth individual charging time set including a plurality of individual charging times and a charging voltage of the battery cell after charging is performed based on the charging order of the plurality of charging currents, and determining the charging order and the fourth individual charging time set as a rapid charging pattern of the battery cell after charging is performed.

[0086] A processor (102) according to one embodiment may be configured to perform an operation of generating a matrix having as components values ​​of a plurality of charging currents and a matrix having as components values ​​of a total charging capacity and a total charging time, arbitrarily changing the order of each component of the matrix having as components values ​​of a plurality of charging currents, and determining first sets of charging currents including a plurality of individual charging times corresponding to each of the changed order of charging currents.

[0087] According to one embodiment, the processor (102) may be configured such that each of a plurality of charging currents included in the charging current set has a different value.

[0088] According to an embodiment, the electronic device (100) may additionally include a transceiver for performing wired / wireless communication. The electronic device (100) may communicate with an external electronic device (e.g., a battery management device (200)) using the transceiver. The external electronic device may be a terminal or a server. In addition, communication technologies used by the transceiver may include GSM (Global System for Mobile communication), CDMA (Code Division Multi Access), LTE (Long Term Evolution), 5G, WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), Bluetooth (Bluetooth), RFID (Radio Frequency Identification), Infrared Data Association (IrDA), ZigBee, NFC (Near Field Communication), etc.

[0089] The electronic device (100) according to the above-described embodiments may include a processor, a memory for storing and executing program data, permanent storage such as a disk drive, a communication port for communicating with an external device, a user interface device such as a touch panel, a key, a button, etc. Methods implemented as software modules or algorithms may be stored on a computer-readable recording medium as computer-readable codes or program commands executable on the processor. Here, the computer-readable recording medium includes a magnetic storage medium (e.g., read-only memory (ROM), random-access memory (RAM), floppy disk, hard disk, etc.) and an optical reading medium (e.g., CD-ROM, DVD: Digital Versatile Disc)). The computer-readable recording medium may be distributed to computer systems connected to a network, so that the computer-readable code may be stored and executed in a distributed manner. The medium may be readable by a computer, stored in a memory, and executed by a processor.

[0090]

[0091] The present embodiment may be represented by functional block configurations and various processing steps. These functional blocks may be implemented by various hardware and / or software configurations that perform specific functions. For example, the embodiment may employ direct circuit configurations such as memory, processing, logic, look-up tables, etc., which may perform various functions under the control of one or more microprocessors or other control devices. Similarly, the present embodiment may be implemented in a programming or scripting language such as C, C++, Java, assembler, etc., including various algorithms implemented as a combination of data structures, processes, routines, or other programming configurations. Functional aspects may be implemented as algorithms that execute on one or more processors. Furthermore, the present embodiment may employ conventional techniques for electronic configuration, signal processing, and / or data processing. Terms such as "mechanism," "element," "means," and "composition" can be used broadly and are not limited to mechanical or physical structures. These terms can also encompass a series of software routines, such as those associated with a processor.

[0092] The above-described embodiments are merely examples, and other embodiments may be implemented within the scope of the claims set forth below.

Claims

1. A method for determining a rapid charging pattern of a battery cell performed by an electronic device, A step of setting a charging current set including a plurality of charging currents of the battery cell, a charging condition including a total charging capacity of the battery cell, and a total charging time of the battery cell; Determining a first set of individual charging times comprising a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the charging conditions; A step of determining a charging order of the plurality of charging currents corresponding to the first individual charging time set; A step of determining a second individual charging time set including the plurality of individual charging times at which the voltage increase of the battery cell after charging is minimized based on the charging order of the plurality of charging currents; and comprising a step of determining the charging sequence and the second individual charging time set as a rapid charging pattern of the battery cell; Method for determining the rapid charging pattern of battery cells.

2. In paragraph 1, The step of determining the first individual charging time set comprises: A step of obtaining a plurality of individual charging time sets such that the sum of the product of a specific charging current included in the charging currents of the battery cells and a specific charging time corresponding to the specific charging current is equal to the total charging capacity of the battery cells, and the sum of the specific charging times is equal to the total charging time of the battery cells; and A step of determining, as the first individual charging time set, an individual charging time set corresponding to the case where the number of times the negative voltage of the battery cell satisfies the threshold voltage during the entire charging process among the plurality of individual charging time sets is the minimum, Method for determining the rapid charging pattern of battery cells.

3. In paragraph 1, The step of determining the above charging order is: A step of determining the charging order in the order of the charging current set corresponding to the case where the number of times the negative voltage of the battery cell satisfies the threshold voltage during the entire charging process according to the charging current value corresponding to the first individual charging time set is the minimum, Method for determining the rapid charging pattern of battery cells.

4. In paragraph 1, After charging according to the rapid charging pattern of the battery cell is performed, the method further comprises the step of obtaining information on the capacity degradation of the battery cell and information on the increase in internal resistance of the battery cell. Method for determining the rapid charging pattern of battery cells.

5. In paragraph 4, A step of setting a charging condition including a set of charging currents including a plurality of charging currents of the battery cell after charging is performed, a total charging capacity of the battery cell after charging is performed, and a total charging time of the battery cell after charging is performed, based on information about a capacity degradation degree of the battery cell and information about an increase in internal resistance of the battery cell; Determining a third individual charging time set including a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the charging conditions; A step of determining a charging order of the plurality of charging currents corresponding to the third individual charging time set; A step of determining a fourth individual charging time set including the plurality of individual charging times and having a minimum charging voltage of the battery cell after the charging is performed based on the charging order of the plurality of charging currents; and Further comprising the step of determining the charging sequence and the fourth individual charging time set as a rapid charging pattern of the battery cell after charging is performed. Method for determining the rapid charging pattern of battery cells.

6. In paragraph 1, The step of setting the above charging conditions is: A step of generating a matrix having as components the values ​​of the plurality of charging currents and a matrix having as components the values ​​of the total charging capacity and the values ​​of the total charging time, The step of determining the first charging current sets is: A step of randomly changing the order of each element of a matrix having the plurality of charging current values ​​as elements, and determining first charging current sets including a plurality of individual charging times corresponding to each of the changed order of charging currents, Method for determining the rapid charging pattern of battery cells.

7. In paragraph 6, Each of the plurality of charging currents included in the above charging current set has a different value. Method for determining the rapid charging pattern of battery cells.

8. In paragraph 1, The above charging conditions are: Determined based on at least one of the internal temperature of the battery cell, the initial SoC of the battery cell, and the internal resistance of the battery cell. Method for determining the rapid charging pattern of battery cells.

9. A non-transitory computer-readable recording medium having recorded thereon a program for executing the method of any one of clauses 1 to 8 on an electronic device.

10. In an electronic device performing a method for determining a rapid charging pattern of a battery cell, memory for storing instructions; and comprising a processor connected to the above memory, The above processor, Setting a set of charging currents including a plurality of charging currents of the battery cell, a charging condition including a total charging capacity of the battery cell and a total charging time of the battery cell, Determine a first individual charging time set including a plurality of individual charging times corresponding to each of the plurality of charging currents satisfying the above charging conditions, Determine the charging order of the plurality of charging currents corresponding to the first individual charging time set, Based on the charging order of the plurality of charging currents, a second individual charging time set including the plurality of individual charging times at which the charging voltage of the battery cell is minimized is determined, and An electronic device configured to determine the charging sequence and the second individual charging time set as a rapid charging pattern of the battery cells.

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