Battery charging control device and method, and battery system including same

Abstract

In a battery charging control device and method, and a battery system including same according to an embodiment of the present invention, a charging state of a battery being charged is monitored, a charging state change of the battery during the charging is compared with a pre-stored reference charging state change acquired from an initial-state battery, and a charging amount of the battery being charged is adjusted, so that overcharging of the battery due to degradation can be prevented.

Description

Battery charging control device and method, and battery system including the same

[0001] This application claims the benefit of Korean Patent Application No. 10-2024-0096201 filed with the Korean Intellectual Property Office on July 22, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery charging control device and method, and a battery system including the same, and more particularly, to a battery charging control device and method for adjusting the size of a charge amount based on a change in the state of charge of a battery according to the degree of degradation during rapid charging of the battery, and a battery system including the same.

[0003] As the price of energy sources rises due to the depletion of fossil fuels and concerns about environmental pollution grow, demand for secondary batteries as an eco-friendly alternative energy source is rapidly increasing.

[0004] Because these secondary batteries can be repeatedly charged and regenerated, they are being used in a variety of applications, from small devices like mobile phones and laptops to large industrial fields such as automobiles, robots, and energy storage devices, as a response to today's environmental regulations and high oil prices.

[0005] Among secondary batteries, lithium secondary batteries are attracting attention due to their advantages, such as almost no memory effect, low self-discharge rate, and high energy density compared to nickel-based secondary batteries.

[0006] As the frequency of use of lithium batteries increases, rapid charging technology for rapid charging of batteries is being introduced.

[0007] Conventional rapid charging technology uses a rapid charging map to obtain information on the size of the charging current for rapid charging based on the temperature and state of charge (SOC) of the battery to be charged, thereby rapidly charging the battery.

[0008] However, since the conventional rapid charging map does not take into account the condition of the battery to be charged, there is a disadvantage in that a fire may occur due to overcharging in a state where the battery has deteriorated, or an abnormality may occur due to deterioration inside the battery.

[0009] An object of the present invention to solve the above problems is to provide a battery charging control device.

[0010] Another object of the present invention to solve the above problems is to provide a battery charging control method.

[0011] Another object of the present invention to solve the above problems is to provide a battery charging system.

[0012] According to one embodiment of the present invention for achieving the above object, a battery charging control device for controlling charging of a battery includes a memory and a processor for executing at least one command stored in the memory, wherein the at least one command includes a command for monitoring a state of charge of the battery being charged, and a command for adjusting a charge amount of the battery being charged by comparing a change in the state of charge of the battery during the charging process with a reference state of charge change obtained from a battery in a pre-stored initial state.

[0013] At this time, the command to adjust the charge amount of the battery may include a command to obtain a charge state graph including at least one of a charge state of the battery in a first charging section before the charge mode of the battery is switched and a charge state of the battery in a second charging section after the switching, a command to calculate a state change rate by comparing the charge state graph with a pre-stored reference charge state graph of the battery in an initial state, and a command to adjust the charge amount of the battery in consideration of the state change rate.

[0014] Here, the command to obtain the charging state graph may include a command to obtain a voltage pattern graph based on a voltage value of the battery measured in at least one of the first charging section and the second charging section.

[0015] Additionally, the command to calculate the state change rate may include a command to calculate the state change rate based on the degree of inflection on the voltage pattern graph that occurs as the charging mode of the battery is switched.

[0016] According to an embodiment, the command to calculate the state change rate may include a command to derive an inflection angle, which is an angle at a point where an inflection occurs on the voltage pattern graph, and a command to calculate a state change rate between the inflection angle and a reference inflection angle of the battery in a pre-stored initial state.

[0017] Here, the reference inflection angle may include a value obtained by calculating a voltage pattern graph for a battery in an initial state and measuring an inflection angle at a point where an inflection occurs on the voltage pattern graph of the battery in the initial state.

[0018] At this time, the command to calculate the state change rate between the inflection angle and the reference inflection angle of the battery in the initial state that has been stored may include a command to calculate the ratio of the inflection angle to the reference inflection angle, and a command to calculate the state change rate using the ratio as a predefined function.

[0019] Here, the above-defined function may include a hyperbolic tangent function.

[0020] Meanwhile, the first charging section may be a section charged in a constant current (CC) charging mode, and the second charging section may be a section charged in a constant voltage (CV) charging mode.

[0021] In addition, the command to adjust the charge amount of the battery in consideration of the state change rate may include a command to increase the charge current threshold value of the battery being charged in the second charging section based on the state change rate, thereby reducing the charge amount of the battery.

[0022] At this time, the charging current threshold value may include a value that determines the charging termination point of the battery in the second charging section.

[0023] In addition, considering the state change rate, the command to adjust the charge amount of the battery may further include a command to reduce the charge amount of the battery at the next charge by lowering the upper limit of the charge voltage at the next charge of the battery based on the state change rate.

[0024]

[0025] According to another embodiment of the present invention for achieving the above object, a battery charging control method for controlling charging of a battery includes a step of monitoring a state of charge of the battery during charging, and a step of adjusting a charge amount of the battery during charging by comparing a change in the state of charge of the battery during the charging process with a reference state of charge change obtained from a battery in a pre-stored initial state.

[0026] At this time, the step of adjusting the charge amount of the battery may include the step of obtaining a charge state graph including at least one of a charge state of the battery in a first charging section before the charge mode of the battery is switched and a charge state of the battery in a second charging section after the switching, the step of calculating a state change rate by comparing the charge state graph with a previously stored reference charge state graph of the battery in an initial state, and the step of adjusting the charge amount of the battery in consideration of the state change rate.

[0027] Here, the step of obtaining the charging state graph may include the step of obtaining a voltage pattern graph based on a voltage value of the battery measured in at least one of the first charging section and the second charging section.

[0028] Additionally, the step of calculating the state change rate may include a step of calculating the state change rate based on the degree of inflection on the voltage pattern graph that occurs as the charging mode of the battery is switched.

[0029] According to an embodiment, the step of calculating the state change rate may include the step of deriving an inflection angle, which is an angle at a point where an inflection occurs on the voltage pattern graph, and the step of calculating a state change rate between the inflection angle and a reference inflection angle of the battery in a pre-stored initial state.

[0030] Here, the reference inflection angle may include a value obtained by calculating a voltage pattern graph for a battery in an initial state and measuring an inflection angle at a point where an inflection occurs on the voltage pattern graph of the battery in the initial state.

[0031] At this time, the step of calculating the state change rate between the inflection angle and the reference inflection angle of the battery in the stored initial state may include the step of calculating the ratio of the inflection angle to the reference inflection angle, and the step of calculating the state change rate using the ratio as a predefined function.

[0032] Here, the above-defined function may include a hyperbolic tangent function.

[0033] Meanwhile, the first charging section may be a section charged in a constant current (CC) charging mode, and the second charging section may be a section charged in a constant voltage (CV) charging mode.

[0034] In addition, considering the state change rate, the step of adjusting the charge amount of the battery may include a step of increasing the charge current threshold value of the battery being charged in the second charging section based on the state change rate, thereby reducing the charge amount of the battery.

[0035] At this time, the charging current threshold value may include a value that determines the charging termination point of the battery in the second charging section.

[0036] In addition, considering the state change rate, the step of adjusting the charge amount of the battery may further include a step of lowering the upper limit of the charge voltage at the next charge of the battery based on the state change rate, thereby reducing the charge amount of the battery at the next charge.

[0037]

[0038] According to another embodiment of the present invention for achieving the above object, a battery charging system for controlling charging of a battery includes a battery, a charging device for charging the battery by applying a charging current to the battery, and a battery charging control device for controlling the magnitude of the charging current provided by the charging device, wherein the battery charging control device monitors a charging state of the battery during charging, and compares a change in the charging state of the battery during the charging process with a reference charging state change obtained from a battery in a pre-stored initial state, thereby adjusting a charge amount of the battery during charging.

[0039] A battery charging control device and method according to an embodiment of the present invention, and a battery system including the same, calculates a state change rate according to the deterioration degree of a battery being charged and reflects this rate during the charging process, thereby preventing overcharging of the battery caused by lithium precipitation, thereby enabling rapid charging with high stability.

[0040] Figure 1 is a block diagram of a battery system to which an embodiment of the present invention can be applied.

[0041] Figure 2 is a block diagram of a battery charging system according to an embodiment of the present invention.

[0042] FIG. 3 is a block diagram of a battery charging control device in a battery charging system according to an embodiment of the present invention.

[0043] FIG. 4 is a flowchart for explaining a method for controlling charging of a battery operated by a processor in a battery charging control device according to an embodiment of the present invention.

[0044] FIG. 5 is a flowchart for explaining a step of monitoring the charging state of a battery among the battery charging control methods according to an embodiment of the present invention.

[0045] Figure 6 is a graph of battery voltage and current according to the charging mode among the battery charging control methods according to an embodiment of the present invention.

[0046] FIG. 7 is a voltage graph of a battery for determining an upper limit value of a charging current in a battery charging control method according to an embodiment of the present invention.

[0047] FIG. 8 is a flowchart for explaining a method for adjusting the charge amount of a battery among battery charging control methods according to an embodiment of the present invention.

[0048] FIG. 9 is a graph for explaining a method for calculating a state change rate among battery charging control methods according to an embodiment of the present invention.

[0049] FIG. 10 is a flowchart for explaining a method for adjusting a charging amount among battery charging control methods according to one embodiment of the present invention.

[0050] FIG. 11 is a flowchart for explaining a method for adjusting a charging amount among battery charging control methods according to another embodiment of the present invention.

[0051] 100: Battery 300: Charger

[0052] 500: Battery charging control device

[0053] 510: Memory 520: Processor

[0054] 530: Transmitter / receiver device 540: Input interface device

[0055] 550: Output interface device 560: Storage device

[0056] 570: Bus

[0057] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components.

[0058] Terms such as "first," "second," "A," and "B" may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, the first component could be referred to as the "second component," and similarly, the second component could also be referred to as the "first component." The term "and / or" includes any combination of multiple related items listed or any one of multiple related items listed.

[0059] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0060] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0061] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0062]

[0063] Figure 1 is a block diagram of a battery system to which an embodiment of the present invention can be applied.

[0064] Referring to Figure 1, a battery may be configured to include multiple battery cells or modules connected in series. The battery cells or modules are connected to a load through positive and negative terminals and can perform charging and discharging operations. The most commonly used battery cells are lithium-ion (Li-Ion) battery cells.

[0065] These battery cells or battery modules may be linked to a battery management system (BMS).

[0066] A battery management system (BMS) monitors the current, voltage, and temperature of each battery cell or module it manages, and calculates the SOC (Status Of Charge) based on the monitoring results, and can control charging and discharging. Here, SOC (State of Charge; charge rate) expresses the current charged state of the battery as a percentage [%], and SOH (State of Health; battery life status) expresses the current deterioration state of the battery as a percentage [%].

[0067] In this way, a battery management system (BMS) can monitor battery cells, read cell voltages, and transmit them to other systems connected to the battery.

[0068] Additionally, the battery management system (BMS) can monitor at least one electrical component that constitutes the battery system and transmit its status data to other systems. To this end, the BMS may include a communication module for communicating with other systems within the device included in the battery system.

[0069] The communication module of a battery management system (BMS) can communicate with other systems within the device using the Controller Area Network (CAN). In this case, electrical components, modules, or systems within the BMS are interconnected via the CAN bus. Accordingly, the BMS can remotely transmit status data acquired through monitoring of a battery pack or module and at least one electrical component comprising the BMS to other systems using CAN communication.

[0070] Meanwhile, the battery management system (BMS) evenly balances the charge of the battery cells to extend the life of the battery system.

[0071] To perform such operations, a battery management system (BMS) may include various components such as fuses, current sensing elements, thermistors, switches, and balancers, and most of them additionally include an MCU (Micro Controller Unit) or BMIC (Battery Monitoring Integrated Chip) to interface with and control these components.

[0072] Meanwhile, the battery charging system according to the embodiment of the present invention is provided as a component of a battery management system (BMS) and can control the charging of a battery.

[0073] Hereinafter, a preferred embodiment of a battery charging system according to the present invention will be described in detail with reference to the attached drawings.

[0074]

[0075] Figure 2 is a block diagram of a battery charging system according to an embodiment of the present invention.

[0076] Referring to FIG. 2, a battery charging system according to an embodiment of the present invention may be a system for controlling battery charging. According to an embodiment, rapid charging of the battery may be controlled.

[0077] More specifically, the battery charging system may include a battery (100), a charging device (300), and a battery charging control device (500).

[0078] The battery (100) may be provided with one or more battery cells. For example, when the battery (100) is provided with a plurality of battery cells, the battery cells may be provided in a structure in which the battery cells are connected in series.

[0079] The charging device (300) is electrically connected to the battery (100) and the battery charging control device (500) and can charge the battery (100).

[0080] To be more specific according to an embodiment, the charging device (300) can receive a charging current value to be applied to the battery (100) from the battery charging control device (500). Thereafter, the charging device (300) can apply a charging current to the battery (100) according to the charging current value, thereby rapidly charging the battery (100).

[0081] The battery charging control device (500) can be electrically connected to the battery (100). Accordingly, the battery charging control device (500) can control the charging of the battery (100).

[0082] According to an embodiment, the battery charging control device (500) can switch the charging mode and charge the battery when rapidly charging the battery. For example, the battery charging control device (500) can perform constant current (CC)-constant voltage (CV) charging on the battery (100).

[0083] At this time, the battery charging control device (500) may adjust the charging amount of the battery (100) by considering the degeneration degree of the battery (100) during the charging process of the battery (100). According to an embodiment, the battery charging control device (500) may adjust at least one charging condition for charging control of the battery (100) in order to adjust the charging amount according to the degeneration degree of the battery (100). For example, the charging condition may be at least one of a charging current threshold value and a charging voltage upper limit value. The charging current threshold value and the charging voltage upper limit value will be described in detail with reference to FIG. 6.

[0084]

[0085] FIG. 3 is a block diagram of a battery charging control device in a battery charging system according to an embodiment of the present invention.

[0086] Referring to FIG. 3, the battery charging control device (500) will be described in more detail by configuration. The battery charging control device (500) may include a memory (510), a processor (520), a transmission / reception device (530), an input interface device (540), an output interface device (550), and a storage device (560).

[0087] According to an embodiment, each of the components (510, 520, 530, 540, 550, 560) included in the battery charge control device (500) is connected by a bus (bus, 570) and can communicate with each other.

[0088] Among the above configurations (510, 520, 530, 540, 550, 560), the memory (510) and the storage device (560) may be configured with at least one of a volatile / transitory storage medium and a non-volatile / non-transitory storage medium. For example, the memory may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM), and may include an Electrically Erasable Programmable Read-only Memory (EEPROM).

[0089] Among these, the memory (510) may include at least one command executed by the processor (520).

[0090] According to an embodiment, the at least one command includes a battery charging control device for controlling charging of a battery according to an embodiment of the present invention for achieving the above object, the device including a memory and a processor for executing at least one command stored in the memory, wherein the at least one command includes a command for monitoring a state of charge of the battery being charged, and a command for adjusting a charge amount of the battery being charged by comparing a change in the state of charge of the battery during the charging process with a reference state of charge change obtained from a battery in a pre-stored initial state.

[0091] At this time, the command to adjust the charge amount of the battery may include a command to obtain a charge state graph including at least one of a charge state of the battery in a first charging section before the charge mode of the battery is switched and a charge state of the battery in a second charging section after the switching, a command to calculate a state change rate by comparing the charge state graph with a pre-stored reference charge state graph of the battery in an initial state, and a command to adjust the charge amount of the battery in consideration of the state change rate.

[0092] Here, the command to obtain the charging state graph may include a command to obtain a voltage pattern graph based on a voltage value of the battery measured in at least one of the first charging section and the second charging section.

[0093] Additionally, the command to calculate the state change rate may include a command to calculate the state change rate based on the degree of inflection on the voltage pattern graph that occurs as the charging mode of the battery is switched.

[0094] According to an embodiment, the command to calculate the state change rate may include a command to derive an inflection angle, which is an angle at a point where an inflection occurs on the voltage pattern graph, and a command to calculate a state change rate between the inflection angle and a reference inflection angle of the battery in a pre-stored initial state.

[0095] Here, the reference inflection angle may include a value obtained by calculating a voltage pattern graph for a battery in an initial state and measuring an inflection angle at a point where an inflection occurs on the voltage pattern graph of the battery in the initial state.

[0096] At this time, the command to calculate the state change rate between the inflection angle and the reference inflection angle of the battery in the initial state that has been stored may include a command to calculate the ratio of the inflection angle to the reference inflection angle, and a command to calculate the state change rate using the ratio as a predefined function.

[0097] Here, the above-defined function may include a hyperbolic tangent function.

[0098] Meanwhile, the first charging section may be a section charged in a constant current (CC) charging mode, and the second charging section may be a section charged in a constant voltage (CV) charging mode.

[0099] In addition, the command to adjust the charge amount of the battery in consideration of the state change rate may include a command to increase the charge current threshold value of the battery being charged in the second charging section based on the state change rate, thereby reducing the charge amount of the battery.

[0100] At this time, the charging current threshold value may include a value that determines the charging termination point of the battery in the second charging section.

[0101] In addition, considering the state change rate, the command to adjust the charge amount of the battery may further include a command to reduce the charge amount of the battery at the next charge by lowering the upper limit of the charge voltage at the next charge of the battery based on the state change rate.

[0102] Meanwhile, the processor (520) may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed.

[0103] The processor (520) can execute at least one program command stored in the memory (510), as described above.

[0104]

[0105] The above has described a battery charging system including a battery charging control device according to an embodiment of the present invention. Below, a battery charging control method performed by the processor operation of the battery charging control device according to an embodiment of the present invention will be described in more detail.

[0106]

[0107] FIG. 4 is a flowchart for explaining a method for controlling charging of a battery operated by a processor in a battery charging control device according to an embodiment of the present invention.

[0108] Referring to FIG. 4, the processor (520) in the battery charging control device (500) according to an embodiment of the present invention can control rapid charging of the battery (100) using the charging device (300). More specifically, according to an embodiment, the processor (520) can transmit a predefined charging current value to the charging device (300) connected to the battery (100). Accordingly, the charging device (300) can apply a charging current having a size corresponding to the received charging current value to the battery (100). Accordingly, the battery (100) can be charged by the charging current. According to an embodiment, the battery (100) can be rapidly charged by the charging current.

[0109] Thereafter, the processor (520) can monitor the charging status of the battery (100) being rapidly charged (S410).

[0110] According to an embodiment, the battery charging control device (500) can obtain at least one piece of charging state information of the battery (100) from the battery (100) that is being rapidly charged. In other words, the battery charging control device (500) can monitor the charging state of the battery (S410). Here, the at least one piece of charging state information can include at least one piece of information among the charging capacity (State of Charge, SOC), voltage (Voltage, V), and current (Current, I) of the battery (100) that is being rapidly charged. For example, the charging state information can be a voltage (V) value of the battery (100).

[0111] Thereafter, the processor (520) can adjust the charge amount of the battery (100) by comparing the change in the charge state of the battery (100) during rapid charging with the reference charge state change obtained from the battery in the stored initial state (S420).

[0112] To explain more specifically according to an embodiment, the processor (520) can monitor the voltage (V) value of the battery (100) being charged in real time and generate a voltage pattern graph of the battery (100) being charged.

[0113] Thereafter, the processor (520) can analyze the degree of degradation of the battery by comparing the voltage pattern graph acquired in real time with the reference voltage pattern graph of the battery in the initial state and calculating the state change rate.

[0114] Thereafter, the processor (520) can adjust the charge amount of the battery (100) by considering the degree of deterioration of the battery (100) based on the state change rate.

[0115]

[0116] FIG. 5 is a flowchart for explaining a step of monitoring the charging state of a battery among the battery charging control methods according to an embodiment of the present invention.

[0117] Referring to FIG. 5, the processor (520) may transmit a charging start signal and a charging current value to the charging device (300) connected to the battery (100) according to the charging mode. Accordingly, the battery (100) may receive a charging current of a size corresponding to the charging current value from the charging device (300) and start rapid charging in the first charging mode (S510). Here, the charging current value may be, for example, a charging current upper limit value (I max ) and charging current threshold (I limit ) may include at least one of the following.

[0118] Thereafter, the processor (520) can obtain in real time the charging status information of the battery (100) from the battery (100) that is being rapidly charged (S520). Accordingly, the processor (520) can obtain a charging status graph based on the charging status information of the battery (100) (S530). According to an embodiment, the charging status information may be a voltage (V) value of the battery (100), and the charging status graph may be a voltage pattern graph of the battery (100).

[0119]

[0120] FIG. 6 is a graph of voltage and current of a battery according to a charging mode in a battery charging control method according to an embodiment of the present invention, and FIG. 7 is a graph of voltage of a battery for determining an upper limit value of a charging current in a battery charging control method according to an embodiment of the present invention.

[0121] Referring to FIG. 6, the processor (520) can control rapid charging of the battery (100) according to the charging mode, as disclosed in FIG. 5.

[0122] According to an embodiment, the processor (520) can rapidly charge the battery (100) in a plurality of charging modes. More specifically, the processor (520) can rapidly charge the battery (100) in a first charging mode in a first charging period (T1), and then, in a second charging period (T2), switch the charging mode to rapidly charge the battery (100) in a second charging mode. For example, the processor (520) can rapidly charge the battery (100) in a constant current (CC)-constant voltage (CV) charging mode.

[0123] More specifically, the processor (520) transmits the charging start signal and the charging current upper limit value (I) to the charging device (300). max ) can be transmitted. Accordingly, the battery (100) receives a charging current upper limit value (I) from the charging device (300).max ) can be applied to start charging in the constant current (CC) charging mode, which is the first charging mode. Here, the charging current upper limit value (I max ) may be set to an upper limit value of the charging current corresponding to the maximum output current that can be output by the charging device (300) or corresponding to the charging capacity (SOC) of the battery, which is defined in the rapid charging map.

[0124] Thereafter, the processor (520) can monitor the charging voltage values ​​from the battery (100) in real time while constant current (CC) charging according to the first charging mode is in progress. Accordingly, the processor (520) can linearize the charging voltage values ​​monitored in real time in the first charging mode (T1) to obtain a first voltage pattern graph. For example, the first voltage pattern graph may be an upward graph.

[0125] At this time, the voltage of the battery (100) is equal to the predefined upper limit of the charging voltage (V max ) is reached, the processor (520) can switch the charging mode of the battery (100) from the first charging mode to the second charging mode. Here, the predefined charging voltage upper limit value (V max ) may be a predefined value based on a lithium deposition experiment of a battery conducted in advance (see Fig. 7). In other words, the upper limit of the charging voltage (V max ) can be set to the maximum voltage value of the battery at which lithium is not deposited on the electrode surface during rapid charging of the battery.

[0126] Afterwards, the processor (520) sends a charging mode switching signal to the charging device (300) along with a charging current threshold value (I limit ) can be transmitted. Therefore, the processor (520) is configured to transmit the charging voltage of the battery (100) to the charging voltage upper limit value (V) during the second charging period (T2). max), while maintaining the charging current of the battery (100) at the charging current threshold value (I limit ) can be reduced. At this time, the charging current threshold value (I limit ) may be a value that determines the charging end point of the battery (100) in the second charging section (T2). In other words, the processor (520) determines that the size of the charging current of the battery (100) is equal to the charging current threshold value (I limit ) when the size corresponding to the charging device (300) is reached, a charging termination signal can be transmitted to the charging device (300) to terminate charging of the battery (100) in the second charging mode.

[0127] Meanwhile, the processor (520) can monitor the charging voltage values ​​from the battery (100) in real time while constant voltage (CV) charging according to the second charging mode is in progress.

[0128] According to an embodiment, the processor (520) can monitor the charging voltage values ​​from the battery (100) in real time for a predetermined period of time from the time when the charging mode of the battery (100) is switched from the first charging mode to the second charging mode. Accordingly, the processor (520) can linearize the voltage values ​​monitored in real time in the second charging mode to obtain a second voltage pattern graph.

[0129] However, the second voltage pattern graph is, by the processor (520), the charging voltage of the battery (100) is the charging voltage upper limit value (V max ) can be displayed in the form of a horizontal graph by adjusting the charging current size of the charging device (300) to maintain the charging current.

[0130] Accordingly, the processor (520) in the battery charging control device according to the embodiment of the present invention, without being limited to what has been described, can obtain a second voltage pattern graph by horizontally extending the upper limit value of the charging voltage, which is the last value on the first voltage pattern graph in the first charging mode, by a predetermined length without obtaining real-time charging status information from the battery (100) in the second charging section (T2).

[0131] Accordingly, the processor (520) can obtain a voltage pattern graph including a first voltage pattern graph and a second voltage pattern graph.

[0132]

[0133] FIG. 8 is a flowchart for explaining a method for adjusting the charge amount of a battery among battery charging control methods according to an embodiment of the present invention.

[0134] Referring to FIG. 8, the processor (520) can calculate a state change rate by comparing a charge state graph obtained through charge state monitoring of the battery (100) with a reference charge state graph of the battery in an initial state (S810). At this time, the battery in an initial state may refer to a battery in a normal state in which lithium precipitation has not occurred. In other words, the processor (520) can determine the degree of deterioration of the battery (100) in the process of rapid charging by comparing the charge state graph of the battery (100) being rapidly charged in the second charging mode with the charge state graph of the battery in an initial state that has not been degraded and calculating a state change rate.

[0135] Thereafter, the processor (520) can adjust the charge amount of the battery (100) that is being rapidly charged in the second charging section (T2) based on the state change rate (S820).

[0136]

[0137] FIG. 9 is a graph for explaining a method for calculating a state change rate among battery charging control methods according to an embodiment of the present invention.

[0138] Referring to FIG. 9, the processor (520) can compare the degree of inflection of the charge state graph of the battery (100) with the standard degree of inflection of the reference charge state graph of the battery in the initial state.

[0139] According to an embodiment, the processor (520) may compare the inflection angle (θ1) of the state of charge graph of the battery (100) with the reference inflection angle (θ2) of the reference state of charge graph of the battery in the initial state. Here, the inflection angle may be an angle formed at a point where an inflection occurs on the state of charge graph.

[0140] More specifically, the processor (520) can calculate the slope of the first state of charge graph in the first charging mode of the battery (100) and the slope of the second state of charge graph in the second charging mode. Thereafter, the processor (520) can derive the magnitude of the inflection angle (θ1) between the first state of charge graph and the second state of charge graph from the slope of the first state of charge graph and the slope of the second state of charge graph. However, without being limited to the disclosure, the processor (520) can derive the magnitude of the inflection angle (θ1) of the battery (100) based on the slope of the first state of charge graph when the second state of charge graph is provided in a horizontal form.

[0141] Thereafter, the processor (520) may compare the derived inflection angle of the battery (100) with the reference inflection angle (θ2) of the battery in a pre-stored initial state. According to an embodiment, the processor (520) may compare the inflection angle (θ1) and the reference inflection angle (θ2) to calculate a ratio (x) of the inflection angle (θ1) of the battery (100) to the reference inflection angle (θ2). For example, the ratio (x) may be a value between greater than 0 and less than 1. In addition, the reference inflection angle (θ2) may be calculated in the same manner as the method of deriving the inflection angle (θ1) of the battery (200) as a setting value pre-stored in the memory (510) or the storage device (560).

[0142] Thereafter, the processor (520) can calculate the state change rate (R) using the ratio (x) using a predefined function. According to an embodiment, the processor (520) can output the state change rate (R) using the ratio (x) using a hyperbolic tangent function, as in [Mathematical Formula 1] below.

[0143]

[0144]

[0145] Here, x can be the ratio of the inflection angle to the reference inflection angle, and R can be the rate of change of state.

[0146]

[0147] Typically, batteries undergo deterioration during rapid charging, with lithium precipitation occurring on the battery surface. Consequently, the battery voltage during constant-current charging can rapidly increase compared to its initial voltage.

[0148] Accordingly, the battery charging control method according to an embodiment of the present invention compares the charging states between a battery in a normal state and a battery (100) undergoing rapid charging in a second charging mode, and based on this, calculates a state change rate reflecting the degree of deterioration of the battery (100) and reflects it in the charging amount in the second charging mode, thereby controlling rapid charging taking into account the degree of deterioration of the battery (100).

[0149]

[0150] FIG. 10 is a flowchart for explaining a method for adjusting a charging amount among battery charging control methods according to one embodiment of the present invention.

[0151] Referring to FIG. 10, the processor (520) can adjust the charge amount of the battery (100) based on the calculated state change rate.

[0152] According to an embodiment, the processor (520) can adjust the charging amount of the battery (100) by adjusting the charging current threshold value of the battery (100) being charged in the second charging period (T2) and thereby adjusting the charging termination time.

[0153] More specifically, the processor (520) sets a preset first charging current threshold value (I) of the battery (100) during rapid charging in the second charging period (T2). limit ), reflecting the state change rate (R), the second charging current threshold (I limit ') can be produced.

[0154] For example, according to one embodiment, the processor (200) may set a preset first charging current threshold value (I limit ) by the rate of change of state (R) to obtain the second charging current threshold (I limit ') can be produced.

[0155] Additionally, according to another embodiment, the processor (200) sets a preset first charging current threshold value (I limit) by multiplying the state change rate (R) by a predefined adjustment constant, and the second charging current threshold (I limit ') can be produced.

[0156] Meanwhile, the state change rate (R) can be greater than 1. Accordingly, the second charging current threshold (I limit ') is the first charging current threshold (I limit ) can be adjusted upwards. Accordingly, the charging end point of the battery (100) is shortened, and thus the charging amount of the battery (100) can be reduced.

[0157] In other words, the processor (520) considers the current degradation state of the battery (100) and sets the first charging current threshold value (I) of the battery (100) that is being rapidly charged in the second charging section (T2). limit ) can be adjusted upward, thereby reducing the charge amount of the battery (100).

[0158]

[0159] FIG. 11 is a flowchart for explaining a method for adjusting a charging amount among battery charging control methods according to another embodiment of the present invention.

[0160] Referring to FIG. 11, the processor (520) can adjust the charge amount of the battery (100) based on the calculated state change rate.

[0161] According to an embodiment, the processor (520) can adjust the charge amount of the battery (100) by adjusting the charge current threshold value of the battery (100) being charged in the second charging period (T2).

[0162] More specifically, the processor (520) sets a preset first charging current threshold value (I) of the battery (100) during rapid charging in the second charging period (T2). limit ), reflecting the state change rate (R), the second charging current threshold (I limit ') can be produced.

[0163] At this time, the state change rate (R) may be greater than 1. Accordingly, the second charging current threshold (I limit ') is the first charging current threshold (I limit ) can be adjusted upwards. Therefore, the charge amount of the battery (100) can be reduced.

[0164] Afterwards, the processor (520) sets the preset first charging voltage upper limit value (V limit ) reflects the state change rate (R), and the second charging voltage upper limit value (V limit ') can be produced. In more detail, the processor (520) can produce a preset first charging voltage upper limit value (V limit ) reflects the state change rate (R), and the second charging voltage upper limit value (V limit ') can be adjusted downwards.

[0165] For example, according to one embodiment, the processor (200) sets a preset first charging voltage upper limit value (V limit ) is multiplied by the inverse of the state change rate (R) to obtain the second charging voltage upper limit (V limit ') can be produced.

[0166] Additionally, according to another embodiment, the processor (200) sets a preset first charging voltage upper limit value (V limit ), the second charging voltage upper limit (V) is multiplied by a predefined adjustment constant multiplied by the inverse of the state change rate (R). limit ') can be produced.

[0167] Meanwhile, the reciprocal of the state change rate (R) may be less than 1. Accordingly, the second charging current threshold (I limit ') is the first charging current threshold (I limit ) may be adjusted upwards.

[0168] Afterwards, the processor (520) calculates the second charging voltage upper limit value (V limit') can be stored in the memory (510) or the storage device (560). According to an embodiment, the processor (520) stores the pre-stored first charging voltage upper limit value (V limit ) Second charging voltage upper limit value (V limit ') can be updated and set. Accordingly, when the next rapid charging of the battery (100) is performed, the processor (520) sets the stored second charging voltage upper limit value (V limit ') can be applied to perform rapid charging according to the first charging mode and the second charging mode. At this time, the second charging voltage upper limit value (V limit ') is the upper limit of the first charging voltage (V limit ) may be smaller than the battery (100). Therefore, the charge amount of the battery (100) may be reduced.

[0169] In summary, according to one embodiment and another embodiment of the present invention, the processor (520) in the battery charging control device measures the deterioration state of the battery (100) each time the battery (100) is rapidly charged, and reflects this in the charge amount of the battery in the second charging mode, thereby preventing a fire of the battery (100) due to overcharging.

[0170]

[0171] The battery charging control device and method according to the embodiment of the present invention, and the battery system including the same have been described.

[0172] A battery charging control device and method according to an embodiment of the present invention, and a battery system including the same, adjusts the charging amount of the battery in a second charging mode in consideration of lithium precipitation occurring as the charging of the battery progresses, thereby preventing a fire caused by overcharging when charging a deteriorated battery, thereby allowing the battery to be charged stably.

[0173]

[0174] The operation of the method according to an embodiment of the present invention may be implemented in various forms related to a program, such as a computer program or code itself or a computer program product.

[0175] Additionally, the computer-readable recording medium may include one or more of a volatile / transitory recording medium and a non-volatile / non-transitory recording medium.

[0176] A computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory, and may include, for example, various types of servers located on a network. Program instructions may include not only machine language codes, such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

[0177] While some aspects of the present invention have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, one or more of the most significant method steps may be performed by such a device.

[0178] Although the present invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. A battery charging control device that controls the charging of a battery, memory; and A processor comprising: a processor for executing at least one instruction stored in the memory; At least one of the above commands, A command to monitor the charging status of the above battery while it is being charged, and A battery charging control device comprising a command to adjust the charge amount of the battery being charged by comparing the change in the charge state of the battery during the charging process with a reference charge state change obtained from a battery in a pre-stored initial state.

2. In claim 1, The command to adjust the charge of the above battery is: A command to obtain a charging state graph including at least one of a charging state of the battery in a first charging section before the charging mode of the battery is switched and a charging state of the battery in a second charging section after the switching; A command to compare the above charge state graph with a previously stored, initial state reference charge state graph of the battery to calculate a state change rate, and A battery charging control device, comprising a command to adjust the charge amount of the battery in consideration of the above state change rate.

3. In claim 2, The command to obtain the above charging status graph is: A battery charging control device comprising a command to obtain a voltage pattern graph based on a voltage value of the battery measured in at least one of the first charging section and the second charging section.

4. In claim 2, The command to calculate the above state change rate is: A battery charging control device, comprising a command to calculate the state change rate based on the degree of inflection on the voltage pattern graph that occurs as the charging mode of the battery is switched.

5. In claim 2, The command to calculate the above state change rate is: A command to derive an inflection angle, which is an angle at a point where an inflection occurs on the voltage pattern graph, and A battery charging control device comprising a command for calculating a state change rate between the above inflection angle and a reference inflection angle of the battery in a stored initial state.

6. In claim 5, The above reference inflection angle is, A battery charging control device that generates a voltage pattern graph for a battery in an initial state and includes a value obtained by measuring an inflection angle at a point where an inflection occurs on the voltage pattern graph of the battery in the initial state.

7. In claim 5, A command to calculate the rate of change in state between the above inflection angle and the reference inflection angle of the battery in the initial state that has been stored, A command to calculate the ratio of the above inflection angle to the above reference inflection angle, and A battery charge control device comprising a command for calculating the state change rate using a predefined function.

8. In claim 7, The above defined function is, A battery charge control device comprising a hyperbolic tangent function.

9. In claim 2, The above first charging section is a section charged in constant current (CC) charging mode, A battery charging control device, wherein the second charging section is a section charged in a constant voltage (CV) charging mode.

10. In claim 9, Considering the above state change rate, a command to adjust the charge amount of the battery is provided. A battery charging control device including a command to increase the charging current threshold of the battery being charged in the second charging section based on the state change rate, thereby reducing the charge amount of the battery.

11. In claim 10, The above charging current threshold is, A battery charging control device comprising a value for determining the charging termination point of the battery in the second charging section.

12. In claim 10, Considering the above state change rate, a command to adjust the charge amount of the battery is provided. A battery charging control device further comprising a command to lower the upper limit of the charging voltage at the next charge of the battery based on the state change rate, thereby reducing the amount of charge of the battery at the next charge.

13. A method for controlling a battery charging control device that controls the charging of a battery, A step of monitoring the charging status of the battery being charged; and A battery charging control method, comprising a step of adjusting the charge amount of the battery being charged by comparing the change in the charge state of the battery during the charging process with a reference charge state change obtained from a battery in a pre-stored initial state.

14. In claim 13, The step of adjusting the charge of the above battery is: A step of obtaining a charging state graph including at least one of a charging state of the battery in a first charging section before the charging mode of the battery is switched and a charging state of the battery in a second charging section after the switching; A step of calculating a state change rate by comparing the above charge state graph with a previously stored, reference charge state graph of the battery in the initial state; and A battery charging control method, comprising a step of adjusting the charge amount of the battery in consideration of the above state change rate.

15. In claim 14, The step of obtaining the above charging status graph is: A battery charging control method, comprising the step of obtaining a voltage pattern graph based on a voltage value of the battery measured in at least one of the first charging section and the second charging section.

16. In claim 14, The step of calculating the above state change rate is: A battery charging control method, comprising a step of calculating the state change rate based on the degree of inflection on the voltage pattern graph that occurs as the charging mode of the battery is switched.

17. In claim 14, The step of calculating the above state change rate is: A step of deriving an inflection angle, which is an angle at a point where an inflection occurs on the voltage pattern graph; and A battery charging control method, comprising a step of calculating a state change rate between the above inflection angle and a reference inflection angle of the battery in a stored initial state.

18. In claim 17, The above reference inflection angle is, A battery charging control method, which includes a voltage pattern graph for a battery in an initial state and a value obtained by measuring an inflection angle at a point where an inflection occurs on the voltage pattern graph of the battery in the initial state.

19. In claim 17, The step of calculating the state change rate between the above inflection angle and the reference inflection angle of the battery in the initial state that has been stored is: A step of calculating a ratio of the inflection angle to the reference inflection angle; and A battery charging control method, comprising a step of calculating the state change rate using a predefined function of the above ratio.

20. In claim 19, The above defined function is, A battery charging control method comprising a hyperbolic tangent function.

21. In claim 14, The above first charging section is a section charged in constant current (CC) charging mode, A battery charging control method, wherein the second charging section is a section charged in a constant voltage (CV) charging mode.

22. In claim 21, Taking into account the above state change rate, the step of adjusting the charge amount of the battery is as follows: A battery charging control method, comprising a step of increasing a charging current threshold value of the battery being charged in the second charging section based on the state change rate, thereby reducing the charging amount of the battery.

23. In claim 22, The above charging current threshold is, A battery charging control method, comprising a value for determining the charging termination point of the battery in the second charging section.

24. In claim 22, Taking into account the above state change rate, the step of adjusting the charge amount of the battery is as follows: A battery charging control method further comprising a step of lowering the upper limit of the charging voltage at the next charge of the battery based on the state change rate, thereby reducing the amount of charge of the battery at the next charge.

25. A battery charging system that controls the charging of a battery, battery; A charging device that charges the battery by applying a charging current to the battery; and A battery charge control device that controls the size of the charging current provided by the charging device, The above battery charging control device, Monitor the charging status of the above battery while charging, A battery charging system that adjusts the charge amount of the battery being charged by comparing the change in the charge state of the battery during the charging process with the reference charge state change obtained from the battery in the initial state that has been stored.

26. A computer-readable medium recording a program for executing the method of any one of claims 13 to 24 on a computer.

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