Battery system and control method thereof

Abstract

A battery system according to the present invention comprises: a first battery pack including a first battery cell; a second battery pack including a second battery cell; a charger; and at least one processor configured to control the charger to sequentially perform constant current (CC) charging of the second battery pack and the first battery pack when input power is identified, and control the charger to sequentially perform constant voltage (CV) charging of the second battery pack and the first battery pack when CC charging of the second battery pack and the first battery pack is completed, wherein the discharge performance of the first battery pack is higher than the discharge performance of the second battery pack, and the charge performance of the second battery pack is higher than the charge performance of the first battery pack.

Description

Battery system and control method thereof

[0001] Embodiments of the present disclosure relate to a battery system and a control method thereof, and more particularly, to a battery system that performs charging and discharging for a plurality of battery packs and a control method thereof.

[0002] Advances in electronic technology have led to the development and widespread adoption of various types of electronic devices. Consequently, the development of secondary batteries, the power source used in these devices, is accelerating.

[0003] A battery system according to one or more embodiments includes: a first battery pack including a first battery cell; a second battery pack including a second battery cell; a charger; and at least one processor; wherein the at least one processor controls the charger to sequentially perform CC (constant current) charging on the second battery pack and the first battery pack when input power is identified, and controls the charger to sequentially perform CV (constant voltage) charging on the second battery pack and the first battery pack when CC charging on the second battery pack and the first battery pack is completed, wherein a discharge performance of the first battery pack may be higher than a discharge performance of the second battery pack, and a charge performance of the second battery pack may be higher than a charge performance of the first battery pack.

[0004] According to one or more embodiments, the battery system further includes a first DC / DC converter for a first load connected to the first battery pack; and a second DC / DC converter for a second load connected to the second battery pack; wherein the at least one processor can sequentially perform discharging of the first battery pack and the second battery pack by turning on the first DC / DC converter and the second DC / DC converter when input power is not identified.

[0005] According to one or more embodiments, the battery system may further include: a power supply; a first switching element connected between the power supply and the charger; a first resistor connected to one end of the first DC / DC converter; a second switching element connected to the first resistor; a third switching element connected between one end of the first DC / DC converter and the charger; a fourth switching element connected between one end of the second DC / DC converter and the charger; a second resistor connected to one end of the first switching element between the third switching element and the fourth switching element; a third resistor connected to one end of the second DC / DC converter; and a fifth switching element connected to the third resistor.

[0006] According to one or more embodiments, the battery system further includes a sixth switching element connected between the first DC / DC converter and the charger; and a seventh switching element connected between the other end of the second DC / DC converter and the charger; wherein the first battery pack is connected between the other end of the first DC / DC converter and the sixth switching element, and the second battery pack is connected between the other end of the second DC / DC converter and the seventh switching element.

[0007] According to one or more embodiments, the at least one processor may monitor an output current of a first load connected to the other end of the second switching element through the first resistor connected to one end of the second switching element, monitor an output current of a second load connected to the other end of the fifth switching element through the third resistor connected to one end of the fifth switching element, and control discharge of the first battery pack and the second battery pack based on the output current of the first load and the output current of the second load.

[0008] According to one or more embodiments, the first load may be a load greater than or equal to a critical size, and the second load may be a load less than or equal to the critical size.

[0009] According to one or more embodiments, the at least one processor may control the charger to perform CC charging for the second battery pack by turning on the first switching element, turning off the second switching element, the third switching element, the fourth switching element, and the fifth switching element, turning off the sixth switching element, and turning on the seventh switching element when the input power is identified.

[0010] According to one or more embodiments, the at least one processor may control the charger to perform CC charging of the first battery pack by turning on the sixth switching element and turning off the seventh switching element when CC charging of the second battery pack is completed, control the charger to perform CV charging of the second battery pack by turning off the sixth switching element and turning on the seventh switching element when CC charging of the first battery pack is completed, and control the charger to perform CV charging of the first battery pack by turning on the sixth switching element and turning off the seventh switching element when CV charging of the second battery pack is completed.

[0011] According to one or more embodiments, the at least one processor may control the charger to perform CC charging on the first battery pack by turning on the first switching element and the sixth switching element and turning off the second switching element, the third switching element, the fourth switching element, the fifth switching element, and the seventh switching element in the section where the input power is identified, when the section where the input power is identified and the section where the input power is not identified are repeated. The at least one processor may control the charger to perform CC charging on the second battery pack by turning on the second switching element, the third switching element, the fourth switching element, the fifth switching element, and the seventh switching element and turning off the first switching element and the sixth switching element in the section where the input power is not identified, and may perform discharging on the first battery pack.

[0012] According to one or more embodiments, the at least one processor may, when the output currents of the first load and the second load are identified, turn off the first switching element, the third switching element, and the fourth switching element, turn on the second switching element and the fifth switching element, and when the output current is less than a reference power, turn on the sixth switching element and turn off the seventh switching element to perform discharging of the first battery pack, and when the output current is greater than or equal to the reference power, turn off the sixth switching element and turn on the seventh switching element to perform discharging of the second battery pack.

[0013] According to one or more embodiments, the first battery pack may include a first battery management module that obtains status information of the first battery cell, and the second battery pack may include a second battery management module that obtains status information of the second battery cell. The at least one processor may monitor battery status information received from the first battery management module and the second battery management module and control CC charging and CV charging for the first battery pack and the second battery pack based on the monitoring result.

[0014] A control method for a battery system including a first battery pack including a first battery cell and a second battery pack including a second battery cell according to one or more embodiments may include the steps of: sequentially performing CC (constant current) charging on the second battery pack and the first battery pack when input power is identified; and sequentially performing CV (constant voltage) charging on the second battery pack and the first battery pack when CC charging on the second battery pack and the first battery pack is completed. A discharge performance of the first battery pack may be higher than a discharge performance of the second battery pack, and a charge performance of the second battery pack may be higher than a charge performance of the first battery pack.

[0015] A non-transitory computer-readable medium storing computer instructions that, when executed by a processor of a battery system including a first battery pack including a first battery cell and a second battery pack including a second battery cell according to one or more embodiments, cause the battery system to perform operations, the operations may include: when an input power is identified, sequentially performing CC (constant current) charging on the second battery pack and the first battery pack; and when the CC charging on the second battery pack and the first battery pack is completed, sequentially performing CV (constant voltage) charging on the second battery pack and the first battery pack. A discharge performance of the first battery pack may be higher than a discharge performance of the second battery pack, and a charge performance of the second battery pack may be higher than a charge performance of the first battery pack.

[0016] The above and other aspects, features and advantages of one or more characteristic embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

[0017] Figures 1a, 1b, 1c and 1d are drawings for explaining the operation of a heterogeneous battery.

[0018] FIG. 2 is a block diagram showing the configuration of a battery system according to one or more embodiments.

[0019] FIG. 3 is a drawing for explaining the configuration of a battery system according to one or more embodiments.

[0020] FIG. 4 is a flowchart illustrating charging and discharging operations of a battery system according to one or more embodiments.

[0021] FIGS. 5 and 6 are drawings for explaining a charging operation when input power is identified according to one or more embodiments.

[0022] FIGS. 7 and 8 are drawings for explaining operations when a section in which input power is identified and a section in which input power is not identified are repeated according to one or more embodiments.

[0023] FIGS. 9 and 10 are drawings for explaining a discharge operation according to discharge power according to one or more embodiments.

[0024] The terms used in this specification will be briefly explained, and the present disclosure will be described in detail.

[0025] The terms used in the embodiments of this disclosure have been selected from widely used, current terms, taking into account the functions of this disclosure. However, these terms may vary depending on the intentions or cases of those skilled in the art, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the description of the relevant disclosure. 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 this disclosure.

[0026] In this specification, expressions such as “has,” “can have,” “includes,” or “may include” indicate the presence of a feature (e.g., a number, function, operation, or component such as a part), and do not exclude the presence of additional features.

[0027] In this disclosure, expressions such as “A or B,” “at least one of A and / or B,” or “one or more of A or / and B” can include all possible combinations of the listed items. For example, “A or B,” “at least one of A and B,” or “at least one of A or B” can all refer to cases where (1) only A is included, (2) only B is included, or (3) both A and B are included.

[0028] As used herein, the expressions “first,” “second,” “first,” or “second,” etc., may describe various components, regardless of order and / or importance, and are only used to distinguish one component from another, but do not limit the components.

[0029] When it is said that a component (e.g., a first component) is “operatively or communicatively coupled with / to” or “connected to” another component (e.g., a second component), it should be understood that the component may be directly coupled to the other component, or may be connected through another component (e.g., a third component).

[0030] The expression "configured to" as used in the present disclosure may be used interchangeably with, for example, "suitable for," "having the capacity to," "designed to," "adapted to," "made to," or "capable of." The term "configured to" may not necessarily mean only "specifically designed to" in terms of hardware.

[0031] In some contexts, the phrase "a device configured to" may mean that the device, in conjunction with other devices or components, is "capable of" performing A, B, and C. For example, the phrase "a processor configured (or set) to perform A, B, and C" may refer to a dedicated processor (e.g., an embedded processor) for performing those operations, or a general-purpose processor (e.g., a CPU or application processor) that can perform those operations by executing one or more software programs stored in a memory device.

[0032] Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "comprise" or "consist of" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] In the embodiments, a "module" or "part" performs at least one function or operation and may be implemented as hardware or software, or as a combination of hardware and software. Furthermore, a plurality of "modules" or "parts" may be integrated into at least one module and implemented as at least one processor (not shown), excluding any "module" or "part" that needs to be implemented as specific hardware.

[0034] The various elements and areas in the drawings are schematically drawn. Therefore, the technical concept of the present invention is not limited by the relative sizes or spacings drawn in the attached drawings.

[0035] One or more embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0036] Figures 1a, 1b, 1c and 1d are drawings for explaining the operation of a heterogeneous battery.

[0037] As battery applications expand, battery characteristics are being developed to match those of the product line. For example, batteries with relatively good (or high) discharge performance (or discharge characteristics) for high-power motors are used in electric vehicles, while batteries with relatively good (or high) charge performance (or charge characteristics) are used in devices such as laptops and mobile devices.

[0038] FIG. 1A and FIG. 1B are drawings for explaining the operation of a battery with high charging performance according to an example.

[0039] According to Figure 1a, a battery with relatively good charging performance can be primarily used in devices such as laptops or portable terminals. According to Figure 1b, a battery with relatively good charging performance has a charging current greater than the discharge current, resulting in higher charging performance compared to its discharge performance.

[0040] FIG. 1c and FIG. 1d are drawings for explaining the operation of a battery with good discharge performance according to an example.

[0041] According to Fig. 1c, a battery with relatively good discharge performance can be primarily used in devices such as high-power motors. According to Fig. 1d, a battery with relatively good discharge performance has a discharge current greater than the charge current, resulting in a relatively high discharge performance compared to the charge performance.

[0042] On the other hand, if a user wants fast charging and uses a battery with relatively good charging characteristics, there is a problem that the discharge characteristics are poor, and if a battery with relatively good discharge characteristics is used for a product that requires high output, there is a problem that the charging characteristics are poor.

[0043] Accordingly, below, various embodiments for securing and controlling battery safety through charge / discharge control of different loads and different types of batteries with different characteristics will be described.

[0044] FIG. 2 is a block diagram showing the configuration of a battery system according to one or more embodiments.

[0045] According to FIG. 2, the battery system (100) includes a battery pack (110), a charger (120), and at least one processor (130).

[0046] The battery system (100) may be implemented to perform charging and discharging of a plurality of battery packs (110). A battery pack refers to a device that combines multiple battery cells into one to protect them from physical impact from the external environment and to perform a specific role.

[0047] According to an example, the battery pack (110) may include a plurality of battery packs. For example, as illustrated in FIG. 2, the battery pack (110) may include a first battery pack (111) and a second battery pack (112).

[0048] The first battery pack (111) may include a first battery cell (111-1). The first battery pack (111) may be implemented to perform a specific operation by including various configurations together with the first battery cell (111-1). According to one example, the first battery pack (111) may include a first battery cell (111-1), a battery management module (111-2), and a switching element (111-3). The first battery cell (111-1) may store supplied electrical energy by converting it into a form of chemical energy, and thereafter, may provide the chemical energy by converting it into a form of electrical energy to supply power to a load.

[0049] The battery cell (111-1) is an individual battery included in the first battery pack (111), and the battery cell (111-1) may be a secondary battery that can be reused through charging even after being discharged. For example, the battery cell (111-1) may be a lithium ion battery. For example, the battery cell (111-1) may be a battery cell such as NCM (Lithium Nickel Cobalt Manganese Oxide, LiNiCoMnO2), LFP - Lithium Iron Phosphate (LiFePO4 / C), LNMO - Lithium Nickel Manganese Spinel (LiNi0.5Mn1.5O4), and NCA (Lithium Nickel Cobalt Aluminum Oxide, LiNiCoAlO2). However, the embodiment is not limited thereto, and there is no particular limitation on the type of the battery cell (111-1). Battery cell (111-1) may refer to a configuration in which multiple battery cells are connected as illustrated in FIG. 2, but the term battery cell is used to refer to one or more battery cells.

[0050] The battery management module (111-2) can obtain information about the status of the first battery cell (111-1). The battery management module (111-2) can detect the remaining capacity of the first battery cell (111-1) and whether the battery cell (121) is faulty, and transmit status information, such as information about the remaining capacity and information about whether the battery cell is faulty, to at least one processor (130). In addition, the battery management module (111-2) can monitor the status, such as the voltage and current, of the first battery cell (111-1). The battery management module (111-2) can be referred to as a so-called BMS (battery management system).

[0051] The switching element (111-3) may be configured to open or close charging or discharging for the first battery cell (111-1). As in the example of FIG. 2, the switching element (111-3) may be implemented in two units and may operate according to a switching signal. For example, at least one processor (130) may transmit a switching signal for controlling the switching element (111-3) connected to the first battery cell (111-1) to the battery management module (111-2), and accordingly, the switching element (111-3) may be turned ON or OFF.

[0052] The second battery pack (112) may include a second battery cell (112-1). The second battery pack (112) may be implemented to perform a specific operation by including various configurations together with the second battery cell (112-1). According to one example, the second battery pack (111) may include a second battery cell (112-1), a battery management module (112-2), and a switching element (112-3). The structure and operation of the battery cell (112-1), the battery management module (112-2), and the switching element (112-3) included in the second battery pack (111) are the same / similar to the structure and operation of the battery cell (111-1), the battery management module (111-2), and the switching element (111-3) included in the first battery pack (111), and therefore, a duplicate description will be omitted.

[0053] According to one or more embodiments, the first battery pack (111) and the second battery pack (112) may be implemented as battery packs of different types (or different kinds). In one example, the first battery pack (111) may be implemented to have a relatively higher discharge performance than the second battery pack (112), and the second battery pack (112) may be implemented to have a relatively higher charge performance than the first battery pack (111).

[0054] In the above-described embodiments, the first battery pack (111) and the second battery pack (112) are described as including battery cells, a battery management module, and a switching element, respectively. However, this is not limited thereto, and depending on the embodiment, components that do not affect the operation according to the present disclosure may be added or existing components may be changed. For example, the first battery pack (111) and the second battery pack (112) may include various control and / or protection devices, such as a cooling device.

[0055] In FIG. 2, the plurality of battery packs (110) are illustrated as including two battery packs, a first battery pack (111) and a second battery pack (112), but are not limited thereto. There is no particular limitation on the number of the plurality of battery packs (110) according to the embodiment, and even when the number of the plurality of battery packs (120) is three or more, various embodiments described below can be applied identically or similarly.

[0056] A charger (120) can charge a battery. For example, the charger (120) may include a charging circuit for charging the battery. The charging circuit may utilize various conventional charging circuit types. The number of chargers included in the charger (120) may be one, but may also be implemented as multiple chargers. There are no specific restrictions on the specifications, including the maximum output of the charger.

[0057] At least one processor (130) (hereinafter referred to as processor) can control the overall operation of the battery system (100) according to the embodiment.

[0058] The processor (130) may be implemented in various ways. For example, the processor (130) may be implemented as a Microcomputer (MICOM), but is not limited thereto. For example, the processor (130) may be implemented as at least one of a Microprocessor-based controller, an Application Specific Integrated Circuit (ASIC), an embedded processor, a microprocessor, hardware control logic, a hardware Finite State Machine (FSM), and a Digital Signal Processor (DSP). Depending on the embodiment, the term processor (130) may be used to mean a Central Processing Unit (CPU), a Graphic Processing Unit (GPU), and a Micro Processor Unit (MPU).

[0059] According to one or more embodiments, when the input power is identified, the processor (130) may control the charger (120) to sequentially perform constant current (CC) charging on the second battery pack (112) and the first battery pack (111). In one example, the second battery pack (112) may be implemented to have higher charging performance than the first battery pack (111), and the first battery pack (111) may be implemented to have higher discharging performance than the second battery pack (112).

[0060] According to one or more embodiments, the processor (130) may control the charger (120) to sequentially perform CV (constant voltage) charging for the second battery pack (112) and the first battery pack (111) when CC charging for the second battery pack (112) and the first battery pack (111) is completed.

[0061] According to one or more embodiments, the processor (130) may monitor battery status information received from the first battery management module (111-2) and the second battery management module (112-2) and control CC charging and CV charging for the first battery cell (111-1) and the second battery cell (112-1) based on the monitoring results.

[0062] For example, the processor (130) may perform CC charging for the second battery cell (112-1) by transmitting a switching signal (e.g., an on signal) to control the switching element (112-3) included in the second battery pack (112) to the second battery management module (112-2).

[0063] For example, when the processor (130) receives status information indicating that CC charging of the second battery cell (112-1) is completed from the second battery management module (112-2), the processor (130) may initiate CC charging of the first battery pack (111). For example, the processor (130) may perform CC charging of the first battery cell (111-1) by transmitting a switching signal (e.g., an ON signal) for controlling a switching element (111-3) included in the first battery pack (111) to the first battery management module (111-2).

[0064] For example, the charging of the first battery pack (111) and the second battery pack (112) may be performed according to the so-called CC (constant current)-CV (constant voltage) charging method. CC-CV charging is a method mainly used for charging lithium ion batteries, and may be a method of first performing CC charging and then performing CV charging when CC charging is complete. Here, CC charging refers to a method of performing charging while maintaining a constant current at a predetermined ampere, and CV charging may be a method of performing charging while maintaining a constant voltage at a predetermined volt.

[0065] Specifically, while CC charging is performed, the current flowing through the first battery cell (111-1) and the second battery cell (112-1) is maintained constant, and accordingly, the voltage inside the first battery cell (111-1) and the second battery cell (112-1) continuously increases. Therefore, when a predetermined time has passed since CC charging is initiated or the voltage inside the first battery cell (111-1) and the second battery cell (112-1) reaches a threshold value, CV charging is performed by reducing the amount of current while keeping the voltage constant to prevent overvoltage.

[0066] For example, when the processor (130) receives status information indicating that CC charging of the first battery cell (111-1) is completed from the first battery management module (111-2), the processor (130) may initiate CV charging of the second battery cell (112-1). For example, the processor (130) may perform CV charging of the second battery cell (112-1) by transmitting a switching signal (e.g., an ON signal) for controlling a switching element (112-3) included in the second battery pack (112) to the second battery management module (112-2).

[0067] For example, when the processor (130) receives status information indicating that CV charging for the second battery cell (112-1) is completed from the second battery management module (112-2), the processor (130) may initiate CV charging for the first battery cell (111-1). For example, the processor (130) may perform CV charging for the first battery cell (111-1) by transmitting a switching signal (e.g., an ON signal) for controlling a switching element (111-1) included in the first battery pack (111) to the first battery management module (111-2).

[0068] According to one or more embodiments, if the input power is not identified, the processor (130) may sequentially perform discharge on the second battery pack (112) and the first battery pack (111). In one example, the discharge of the first battery pack (111) and the second battery pack (112) may be performed according to a CC discharge method. For example, when discharging the first battery pack (111) and the second battery pack (112), a CC discharge is performed to maintain a constant current, thereby preventing overcurrent and generating a constant output.

[0069] FIG. 3 is a drawing for explaining the configuration of a battery system according to one or more embodiments.

[0070] According to FIG. 3, a battery system (100') according to one or more embodiments may include a first battery pack (111), a second battery pack (112), a charger (120), a processor (130), a first DC / DC converter (141), a second DC / DC converter (142), a power supply (150), and switching elements (Q1, Q2, Q3, Q4, Q5, Q6, Q7) connecting each block.

[0071] The first DC / DC converter (141) is connected to the first battery pack (111) and may be a converter for a first load. For example, the first load may be a relatively heavy load exceeding a critical size. For example, the critical size may be a value preset during manufacturing. However, the critical size may vary depending on the usage pattern of the battery system (100').

[0072] The second DC / DC converter (142) is connected to the first battery pack (112) and may be a converter for a second load. For example, the second load may be a light load below a critical size.

[0073] The first DC / DC converter (141) and the second DC / DC converter (142) are devices that convert a certain DC voltage into another DC voltage, and can operate to maintain the output voltage of the first battery pack (111) and the second battery pack (112) at a constant voltage regardless of the discharge state of the battery cells. For example, the first DC / DC converter (141) and the second DC / DC converter (142) can convert the relatively high-voltage DC power output from the battery into a suitable low-voltage DC suitable for the load.

[0074] The power supply unit (150) may be configured to supply power to the charger (120). For example, the power supply unit (150) may be implemented to support USB PD (USB power delivery), which supplies power to a device having a USB port via a USB (universal serial bus) cable, but is not limited thereto.

[0075] According to one or more embodiments, the processor (130) may receive battery information from the first battery management module (111-2) and the second battery management module (112-2). For example, the first battery pack (111) may be implemented to have relatively high discharge performance and the second battery pack (112) may be implemented to have relatively high charge performance. In this case, the processor (130) may know the characteristics of each battery pack (111, 112). The processor (130) may monitor the capacities of the first battery pack (111) and the second battery pack (112) based on the battery information received from the first battery management module (111-2) and the second battery management module (112-2), and may monitor SoC (system-on-chip) information of the first battery pack (111) and the second battery pack (112).

[0076] According to one or more embodiments, the processor (130) can monitor input and output information of the charger (120) and the first DC / DC converter (141) and the second DC / DC converter (142) and control the input and output.

[0077] According to one or more embodiments, the processor (130) may receive a PS (Power supply) ON / OFF signal from the load to determine the required power information of the load.

[0078] According to one or more embodiments, when the input power is identified, the processor (130) may control the charger (120) to sequentially perform constant current (CC) charging on the second battery pack (112) and the first battery pack (111). In one example, the second battery pack (112) may be implemented to have higher charging performance than the first battery pack (111), and the first battery pack (111) may be implemented to have higher discharging performance than the second battery pack (112).

[0079] According to one or more embodiments, the processor (130) may control the charger (120) to sequentially perform CV (constant voltage) charging on the second battery pack (112) and the first battery pack (111) when CC charging on the second battery pack (112) and the first battery pack (111) is completed. However, the processor (130) may control the charger (120) to sequentially perform CV (constant voltage) charging on the first battery pack (111) and the second battery pack (111) when CC charging on the second battery pack (111) and the first battery pack (112) is completed.

[0080] According to one or more embodiments, if the input power is not identified, the processor (130) may sequentially perform discharge on the first battery pack (112) and the second battery pack (112) by turning on the first DC / DC converter (141) and the second DC / DC converter (142). For example, the processor (130) may perform discharge on the second battery pack (112) and, when the discharge on the second battery pack (111) is finished, perform discharge on the first battery pack (111), but is not limited thereto. For example, the processor (130) may perform discharge on the first battery pack (111) and, when the discharge on the first battery pack (111) is finished, perform discharge on the second battery pack (112).

[0081] According to one or more embodiments, a first switching element (Q1) may be provided between the power supply unit (150) and the charger (120). For example, the switching element may be a component that has a circuit switching function without using a contact. For example, the switching element may be implemented as a diode, a transistor, a MOSFET (Metal Oxide Semiconductor Field Effect transistor), an IGBT (insulated gate bipolar mode transistor), or the like.

[0082] According to one or more embodiments, a first resistor (R1) may be provided at one end of the first DC / DC converter (141). The resistor may be a component that acts to impede the flow of current through a conductor.

[0083] According to one or more embodiments, a second switching element (Q2) may be provided on the opposite end of the first resistor (R1) connected to the first DC / DC converter (141). According to one example, a first load may be connected to the other end of the second switching element (Q2). For example, the first load may be a heavy load having a critical size or greater.

[0084] According to one or more embodiments, a third switching element (Q3) may be provided between one end of the first DC / DC converter (141) and the charger (120). For example, the third switching element (Q3) may be connected to one end of the first DC / DC converter (141) and the first resistor (R1).

[0085] According to one or more embodiments, a fourth switching element (Q4) may be provided between one end of the second DC / DC converter (142) and the charger (120). For example, the fourth switching element (Q4) may be connected to one end of the second DC / DC converter (142) and the third resistor (R3).

[0086] According to one or more embodiments, a third resistor (R3) may be provided at one end of the second DC / DC converter (142).

[0087] According to one or more embodiments, a second resistor (R2) may be provided at one end of the first switching element (Q1) between the third switching element (Q3) and the fourth switching element.

[0088] According to one or more embodiments, a fifth switching element (Q5) may be provided on the opposite side of the third resistor (R3) connected to the second DC / DC converter (142). In one example, a second load may be connected to the other side of the fifth switching element (Q5). For example, the second load may be a light load having a lower than critical size.

[0089] According to one or more embodiments, a sixth switching element (Q6) may be provided between the other end of the first DC / DC converter (141) and the charger (120). According to one example, the first battery pack (111) may be provided between the other end of the first DC / DC converter (141) and the sixth switching element (Q6).

[0090] According to one or more embodiments, a seventh switching element (Q7) may be provided between the other end of the second DC / DC converter (142) and the charger (120). According to one example, a second battery pack (112) may be provided between the other end of the second DC / DC converter (142) and the seventh switching element (Q7).

[0091] According to one or more embodiments, when input power is identified from the power supply unit (150), the processor (130) may control the charger (120) to sequentially perform CC charging on the first battery pack (111) and the second battery pack (112). In one example, the first battery pack (111) may be implemented to have a higher discharge performance than the second battery pack (112), and the second battery pack (112) may be implemented to have a higher charge performance than the first battery pack (111).

[0092] According to one or more embodiments, the processor (130) may control the charger (120) to sequentially perform CV charging for the first battery pack (111) and the second battery pack (112) when CC charging for the first battery pack (111) and the second battery pack (112) is completed.

[0093] According to one or more embodiments, the processor (130) can monitor the output current of a first load connected to the other end of the second switching element (Q2) through a first resistor (R1) connected to one end of the second switching element (Q2).

[0094] According to one or more embodiments, the processor (130) can monitor the output current of a second load connected to the other end of the fifth switching element (Q5) through a third resistor (R3) connected to one end of the fifth switching element (Q5).

[0095] According to one or more embodiments, the processor (130) can control the discharge of the first battery pack (111) and the second battery pack (112) based on the output current of the first load and the output current of the second load.

[0096] Meanwhile, the battery system (100') may further include, in addition to the configuration shown in FIG. 3, a housing for protecting the battery pack (110) and the charger (120), an insulation for preventing short-circuits, a circuit for connecting components inside the battery system (100'), a cooler for preventing overheating of the battery system (100'), etc.

[0097] FIG. 4 is a flowchart illustrating charging and discharging operations of a battery system according to one or more embodiments.

[0098] According to the flowchart illustrated in FIG. 4, in operation 401, the battery system (100, 100') can identify whether there is input power. According to one or more embodiments, the processor (140) can identify whether there is input power based on an interrupt. For example, the interrupt may be to notify the processor (130) so that processing can be performed when an exceptional situation occurs in a device such as input / output hardware while the processor (130) is executing a program. For example, the battery system (100, 100') can identify whether there is input power based on an interrupt connected to an external power supply device through a power supply unit (150).

[0099] In operation 401, the battery system (100, 100') may initiate CC charging for the second battery pack (112) in operation 402 if there is input power (S401:Y). For example, the second battery pack (112) may be a battery pack having relatively high charging performance (or charging characteristics). For example, if the first battery pack (111) has relatively high discharging performance and the second battery pack (112) is implemented to have relatively high charging performance, CC charging for the second battery pack (112) having relatively high charging performance may be performed first.

[0100] In operation 403, the battery system (100, 100') can identify whether the CC period for the second battery pack (112) has ended. For example, the processor (130) can identify that the CC period has ended when status information indicating that CC charging for the second battery cell (112-1) has been completed is received from the second battery management module (112-2).

[0101] If it is identified that the CC section for the first battery pack (111) has ended in operation 403 (S403:Y), then in operation 404, the battery system (100, 100') can end the CC charging for the first battery pack (111).

[0102] In operation 404, when the CC charging for the second battery pack (112) is terminated, in operation 405, the battery system (100, 100') can initiate the CC charging for the first battery pack (111) having a relatively high discharge performance.

[0103] In operation 406, the battery system (100, 100') can identify whether the CC period for the first battery pack (111) has ended. For example, the processor (130) can identify that the CC period has ended when status information indicating that CC charging for the first battery cell (111-1) has been completed is received from the first battery management module (111-2).

[0104] If it is identified that the CC section for the first battery pack (111) has ended in operation 406 (S406:Y), then in operation 407, the battery system (100, 100') can end the CC charging for the first battery pack (111).

[0105] At operation 407, when CC charging for the first battery pack (111) is terminated, at operation 408, the battery system (100, 100') can initiate CV charging for the second battery pack (112).

[0106] At operation 409, the battery system (100, 100') can identify whether the CV period for the second battery pack (112) has ended. For example, the processor (130) can identify that the CV period has ended when status information indicating that CV charging for the second battery cell (112-1) has been completed is received from the second battery management module (112-2).

[0107] If it is identified that the CV section for the second battery pack (112) has ended in operation 409 (S409:Y), then in operation 410, the battery system (100, 100') can end CV charging for the second battery pack (112).

[0108] At operation 410, when CV charging for the second battery pack (112) is terminated, at operation 411, the battery system (100, 100') can initiate CV charging for the first battery pack (111).

[0109] At operation 412, the battery system (100, 100') can identify whether the CV period for the first battery pack (111) has ended. For example, the processor (130) can identify that the CV period has ended when status information indicating that CV charging for the first battery cell (111-1) has been completed is received from the first battery management module (111-2).

[0110] If it is identified that the CV section for the first battery pack (111) has ended in operation 412 (S412:Y), then in operation 413, the battery system (100, 100') can end CV charging for the first battery pack (111).

[0111] The battery system (100, 100') can initiate discharging of the first battery pack (111) at operation 401, when there is no input power (S401:N), at operation 415.

[0112] The battery system (100, 100') can discharge the second battery pack (112) by turning on the first DC / DC converter (141) at operation 416 and turning on the second DC / DC converter (142) at operation 417.

[0113] In operation 418, the battery system (100, 100') can identify whether the discharge of the second battery pack (112) has ended. For example, the processor (130) can identify that the discharge has ended when status information indicating that the discharge of the first battery cell (111-1) has been completed is received from the first battery management module (111-2).

[0114] When the battery system (100, 100') identifies that the discharge of the second battery pack (112) has ended (S418:Y), in operation 419, it can initiate the discharge of the first battery pack (111).

[0115] The battery system (100, 100') can discharge the first battery pack (111) by turning on the first DC / DC converter (141) at operation 420 and turning on the second DC / DC converter (142) at operation 421.

[0116] In operation 422, the battery system (100, 100') can identify whether the discharge of the first battery pack (111) is completed. For example, the processor (130) can identify that the discharge is completed when status information indicating that the discharge of the first battery cell (111-1) is completed is received from the first battery management module (111-2).

[0117] When the battery system (100, 100') identifies that the discharge of the first battery pack (111) has ended (S422:Y), it can identify whether the battery is completely discharged in operation 423.

[0118] Meanwhile, in FIG. 4, the order of all steps is mapped for convenience of explanation, but the order of steps that are not related to the order or can be performed in parallel is not necessarily limited to the order. For example, the CV charging operation of the first battery pack (111) described in operations 411 to 413 may be performed before the CV charging operation of the second battery pack (112) described in operations 408 to 410. For example, the discharging operation of the first battery pack (111) described in operations 419 to 422 may be performed before the discharging operation of the second battery pack (112) described in operations 414 to 418.

[0119] Below, the operation according to each embodiment will be described with reference to FIGS. 5 to 10 based on FIG. 4.

[0120] According to one or more embodiments, the battery system (110, 100') may perform CC charging on a second battery pack (112) having relatively high charging performance as described in FIGS. 3 and 4 and then perform CC charging on a first battery pack (111) having relatively high discharging performance. However, for convenience of explanation, it will be described below that CC charging on the first battery pack (111) is performed first.

[0121] FIGS. 5 and 6 are drawings for explaining a charging operation when input power is identified according to one or more embodiments.

[0122] As illustrated in FIG. 5, when the input power is identified through the power supply unit (150), the processor (130) can sequentially perform CC charging for the first battery pack (112) and the second battery pack (111), and then sequentially perform CV charging for the first battery pack (111) and the second battery pack (112).

[0123] For example, as illustrated in FIG. 6, the processor (130) can turn on the first switching element (Q1) and turn off the second switching element (Q2), the third switching element (Q3), the fourth switching element (Q4), and the fifth switching element (Q5). This is to perform only the charging operation of the first battery pack (111) and the second battery pack (112) through the input power, and accordingly, the second switching element (Q2), the third switching element (Q3), the fourth switching element (Q4), and the fifth switching element (Q5) related to battery discharge can be turned off.

[0124] For example, as illustrated in FIG. 6, the processor (130) can control the charger (120) to perform CC charging of the first battery pack by turning on the sixth switching element (Q6) and turning off the seventh switching element (Q7) (#1 battery CC charging section). In this case, as illustrated in FIG. 5, in the “#1 battery CC charging section”, the charging current of the first battery pack (111) is maintained constant according to the CC charging of the first battery pack (111), and the charging voltage of the first battery pack (111) gradually increases (or rises).

[0125] For example, as illustrated in FIG. 6, when CC charging of the first battery pack (111) is completed, the processor (130) can control the charger (120) to turn off the sixth switching element (Q6) and turn on the seventh switching element (Q7) to perform CC charging of the second battery pack (112) (#2 battery CC charging section). In this case, as illustrated in FIG. 5, in the “#2 battery CC charging section”, the charging current of the second battery pack (112) is maintained constant according to the CC charging of the second battery pack (112), and the charging voltage of the second battery pack (112) gradually increases.

[0126] For example, as illustrated in FIG. 6, when CC charging for the second battery pack (112) is completed, the processor (130) can turn on the sixth switching element (Q6) and turn off the seventh switching element (Q7) to perform CV charging for the first battery pack (111) (#1 battery CV charging section). In this case, as illustrated in FIG. 5, in the "#1 battery CV charging section", the charging current of the first battery pack (111) decreases according to CV charging of the first battery pack (111), and the charging voltage of the first battery pack (111) is maintained.

[0127] For example, as illustrated in FIG. 6, when CV charging for the first battery pack (111) is completed, the processor (130) can control the charger (120) to turn off the sixth switching element (Q6) and turn on the seventh switching element (Q7) to perform CV charging for the second battery pack (112) (#2 battery CV charging section). In this case, as illustrated in FIG. 5, in the “#2 battery CV charging section”, the charging current of the second battery pack (111) decreases according to CV charging of the second battery pack (112), and the charging voltage of the second battery pack (112) is maintained.

[0128] FIGS. 7 and 8 are drawings for explaining operations when a section in which input power is identified and a section in which input power is not identified are repeated according to one or more embodiments.

[0129] As illustrated in FIG. 7, the processor (130) can perform CC charging on the first battery pack (111) in a section where input power is identified through the power supply unit (150) (#1 battery rapid charging section (1)). According to an example, the processor (130) can perform CC charging on the first battery pack (111) by turning on the first switching element (Q1) and the sixth switching element (Q6) and turning off the second switching element (Q2), the third switching element (Q3), the fourth switching element (Q4), the fifth switching element (Q5), and the seventh switching element (Q7) in the “#1 battery rapid charging section (1)” as illustrated in FIG. 8. In this case, as shown in FIG. 7, in the “#1 battery rapid charging section (1)”, the charging current of the first battery pack (111) is maintained constant according to the CC charging of the first battery pack (111), and the charging voltage of the first battery pack (111) gradually increases.

[0130] As illustrated in FIG. 7, the processor (130) can perform discharging of the first battery pack (111) and CC charging of the second battery pack (111) in a section where input power is not identified through the power supply unit (150) (#1 battery discharging and #2 battery charging section (1)). According to an example, as illustrated in FIG. 8, the processor (130) can perform CC charging of the second battery pack (112) and discharging of the first battery pack (111) by turning off the first switching element (Q1) and the sixth switching element (Q6) and turning on the second switching element (Q2), the third switching element (Q3), the fourth switching element (Q4), the fifth switching element (Q), and the seventh switching element (Q7) in the “#1 battery discharging and #2 battery charging section (1).” In this case, as illustrated in FIG. 7, in the "#1 battery discharge and #2 battery charge section (1)", the charging current of the second battery pack (112) is maintained constant according to the CC charging of the second battery pack (112), and the charging voltage of the second battery pack (112) gradually increases. In addition, as illustrated in FIG. 7, in the "#1 battery discharge and #2 battery charge section (1)", the light load output current and the heavy load output current are each maintained at constant values ​​according to the discharging of the first battery pack (111).

[0131] As illustrated in FIG. 7, the processor (130) can perform CC charging on the first battery pack (111) in a section where the input power is identified again through the power supply unit (150) (#1 battery rapid charging section (2)). According to an example, the processor (130) can perform CC charging on the first battery pack (111) by turning on the first switching element (Q1) and the sixth switching element (Q6) and turning off the second switching element (Q2), the third switching element (Q3), the fourth switching element (Q4), the fifth switching element (Q5), and the seventh switching element (Q7) in the “#1 battery rapid charging section (2)” as illustrated in FIG. 8. In this case, as shown in FIG. 7, in the “#1 battery rapid charging section (2)”, the charging current of the first battery pack (111) is maintained constant according to the CC charging of the first battery pack (111), and the charging voltage of the first battery pack (111) gradually increases.

[0132] As illustrated in FIG. 7, the processor (130) can perform discharging of the first battery pack (111) and CC charging of the second battery pack (111) in a section where the input power is not identified again through the power supply unit (150) (#1 battery discharging and #2 battery charging section (2)). According to an example, as illustrated in FIG. 8, the processor (130) can perform CC charging of the second battery pack (112) and discharging of the first battery pack (111) by turning off the first switching element (Q1) and the sixth switching element (Q6) and turning on the second switching element (Q2), the third switching element (Q3), the fourth switching element (Q4), the fifth switching element (Q), and the seventh switching element (Q7) in the “#1 battery discharging and #2 battery charging section (2).” In this case, as illustrated in FIG. 7, in the "#1 battery discharge and #2 battery charge section (2)", the charging current of the second battery pack (112) is maintained constant according to the CC charging of the second battery pack (112), and the charging voltage of the second battery pack (112) gradually increases. In addition, as illustrated in FIG. 7, in the "#1 battery discharge and #2 battery charge section (2)", the light load output current and the heavy load output current are each maintained at constant values ​​according to the discharging of the first battery pack (111).

[0133] FIGS. 9 and 10 are drawings for explaining a discharge operation according to discharge power according to one or more embodiments.

[0134] According to one or more embodiments, when the output current of the load is identified, the processor (130) may perform a discharge on at least one of the first battery pack (111) and the second battery pack (112) based on whether the output current of the load is greater than or equal to a reference current.

[0135] According to one or more embodiments, when the output current of the load (light load + heavy load) is identified as being higher than a threshold value as illustrated in FIG. 9, the processor (130) may maintain the off states of the first switching element (Q1), the third switching element (Q3), and the fourth switching element (Q4) and turn on the second switching element (Q2) and the fifth switching element (Q5). This is to perform only the discharging operation of the first battery pack (111) and the second battery pack (112), and accordingly, the off states of the first switching element (Q1), the third switching element (Q3), and the fourth switching element (Q4) related to battery charging may be maintained.

[0136] For example, the processor (130) may turn on the sixth switching element (Q6) and turn off the seventh switching element (Q7) to discharge the first battery pack (111) in a section where the output current of the load is less than the reference power. In this case, as illustrated in FIG. 9, as the output current of the load gradually (e.g., stepwise) increases, the discharge current of the first battery pack (111) may also gradually increase, and the voltage of the first battery pack (111) may smoothly decrease.

[0137] For example, the processor (130) may turn off the sixth switching element (Q6) and turn on the seventh switching element (Q7) to discharge the second battery pack (112) in a section where the output current of the load is greater than or equal to the reference power. For example, the reference power may be a value preset during manufacturing. In this case, as illustrated in FIG. 9, as the output current of the load is constantly maintained above the reference power, the discharge current of the second battery pack (112) is maintained constant, and the voltage of the second battery pack (111) may linearly decrease.

[0138] For example, the processor (130) may turn on the sixth switching element (Q6) and turn off the seventh switching element (Q7) to discharge the first battery pack (111) in a section where the output current of the load is less than the reference power. In this case, as illustrated in FIG. 9, as the output current of the load is constantly maintained below the reference power, the discharge current of the first battery pack (111) is maintained constant, and the voltage of the second battery pack (111) may linearly decrease.

[0139] However, it is not limited to the embodiments illustrated in FIGS. 9 and 10, and if the output current of the load is less than the reference power, discharge may be performed on the second battery pack (112) first, and if the output current of the load is relatively greater than the reference power, discharge may be performed on the first battery pack (111).

[0140] In the above-described embodiment, it has been described that the processor (130) directly performs all control operations. However, according to another example, each of the first battery pack (111) and the second battery pack (112) may be provided with a battery processor, and it may be possible to control charging and / or discharging of the first battery pack (111) and the second battery pack (112) through the battery processor. For example, the battery processor may perform charging and discharging according to the embodiment by transmitting a switching signal for controlling a switching element connected to a battery cell to a battery management module. For example, the battery processor may obtain status information of the battery cell through the battery management module and transmit the status information of the battery cell to the processor (130). The battery processor may be implemented as a microcontroller unit (MCU) or a microcontroller, but is not limited thereto.

[0141] According to one or more embodiments, the battery system (100, 100') may receive status information of battery cells (111-1, 112-1) included in the battery pack (120) from the battery management module (111-2, 112-2) and provide the information to the user. For example, the battery system (100, 100') may include a communication interface including at least one of a WiFi module, a Bluetooth module, a wireless communication module, an NFC module, and a UWB module (Ultra Wide Band), and the processor (130) may control the communication interface to transmit the status information of the battery cells (111-1, 112-1) to an external device. In this case, the status information of the battery cells (111-1, 112-1) may be provided to the user through the external device.

[0142] Additionally, the battery system (100, 100') may include an output interface including a display and a speaker. In this case, the processor (130) may control the display to display an image regarding the status information of the battery cell (111-1, 112-1) or control the speaker to output a sound corresponding to the status information of the battery cell (111-1, 112-1).

[0143] In one or more embodiments, the processor (130) may receive information on the remaining capacity of the battery cells (111-1, 112-1) included in the battery pack (120) from the battery management modules (111-2, 112-2) included in the battery pack (120). The processor (130) may obtain information on the total remaining capacity representing the remaining capacity of the entire battery cells (111-1, 112-1) by adding up the information on the remaining capacity of the battery cells (111-1, 112-1). When the information on the total remaining capacity is received, the processor (130) may control a communication interface to transmit the information on the total remaining capacity to an external device, and may also control an output interface to provide the information on the total remaining capacity.

[0144] In one or more embodiments, the processor (130) may receive information on whether a battery cell (111-1, 112-1) included in the battery pack (120) is faulty from a battery management module (111-2, 112-2) included in the battery pack (120). When information on whether a battery cell (111-1, 112-1) included in the battery pack (120) is faulty is received, the processor (130) may control a communication interface to transmit information on whether a battery cell (111-1, 112-1) included in the battery pack (120) to an external device, and may also control an output interface to provide information on whether a battery cell (111-1, 112-1) is faulty.

[0145] According to the various embodiments described above, the system can be appropriately configured by simultaneously applying different loads and different batteries and leveraging the charge / discharge characteristics of each battery. This enables both fast charging and high-power discharge, significantly improving user experience. Furthermore, by leveraging the strengths of batteries with different characteristics, battery usability and lifespan can be improved.

[0146] The methods according to the various embodiments of the present disclosure described above can be implemented only with a software upgrade or a hardware upgrade for existing electronic devices and / or servers.

[0147] Additionally, the various embodiments described above can also be performed through an embedded server provided in an electronic device or an external server of the electronic device.

[0148] According to one or more embodiments, the various embodiments described above may be implemented as software including instructions stored in a machine-readable storage medium that can be read by a machine (e.g., a computer). The device may include an electronic device (e.g., electronic device (A)) according to the embodiments, which is a device that can call instructions stored from the storage medium and operate according to the called instructions. When an instruction is executed by a processor, the processor may perform an operation corresponding to the instruction directly or under the control of the processor by using other components. The instruction may include code generated or executed by a compiler or an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' means that the storage medium does not contain a signal and is tangible, but does not distinguish between data being stored semi-permanently or temporarily in the storage medium.

[0149] Furthermore, according to one or more embodiments of the present disclosure, the methods according to the various embodiments described above may be provided as included in a computer program product. The computer program product may be traded as a commodity between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)) or online through an application store (e.g., Play Store™). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0150] In addition, each of the components (e.g., modules or programs) according to the various embodiments described above may be composed of a single or multiple entities, and some of the sub-components described above may be omitted, or other sub-components may be further included in various embodiments. Alternatively or additionally, some components (e.g., modules or programs) may be integrated into a single entity, which may perform the same or similar operations performed by each of the respective components prior to integration. Operations performed by modules, programs or other components according to various embodiments may be executed sequentially, in parallel, iteratively or heuristically, or at least some operations may be executed in a different order, omitted, or other operations may be added.

[0151] Although the embodiments have been described with reference to the drawings, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope defined by the following claims and their equivalents.

Claims

1. In the battery system, A first battery pack comprising a first battery cell; A second battery pack comprising a second battery cell; charger; and When the input power is identified, the charger is controlled to sequentially perform CC (constant current) charging for the second battery pack and the first battery pack, At least one processor controlling the charger to sequentially perform CV (constant voltage) charging for the second battery pack and the first battery pack when CC charging for the second battery pack and the first battery pack is completed; The discharge performance of the first battery pack is higher than the discharge performance of the second battery pack, A battery system wherein the charging performance of the second battery pack is higher than the charging performance of the first battery pack.

2. In paragraph 1, a first DC / DC converter for a first load connected to the first battery pack; and Further comprising a second DC / DC converter for a second load connected to the second battery pack; At least one processor, A battery system, wherein when the input power is not identified, the first DC / DC converter and the second DC / DC converter are turned on to sequentially perform discharge on the second battery pack and the first battery pack.

3. In paragraph 2, power supply; A first switching element connected between the power supply unit and the charger; A first resistor connected to the first terminal of the first DC / DC converter; A second switching element connected to the first resistor; A third switching element connected between the first stage of the first DC / DC converter and the charger; A fourth switching element connected between the first stage of the second DC / DC converter and the charger; A second resistor connected to the first terminal of the first switching element between the third switching element and the fourth switching element; a third resistor connected to the first terminal of the second DC / DC converter; and A battery system further comprising a fifth switching element connected to the third resistor.

4. In paragraph 2, A sixth switching element connected between the first DC / DC converter and the charger; and Further comprising a seventh switching element connected between the other end of the second DC / DC converter and the charger; The first battery pack is connected between the second stage of the first DC / DC converter and the sixth switching element, A battery system, wherein the second battery pack is connected between the second stage of the second DC / DC converter and the seventh switching element.

5. In paragraph 4, At least one processor, Monitor the output current of the first load connected to the second terminal of the second switching element through the first resistor connected to one terminal of the second switching element, Monitor the output current of the second load connected to the second terminal of the fifth switching element through the third resistor connected to the first terminal of the fifth switching element, A battery system that controls the discharge of the first battery pack and the second battery pack based on the output current of the first load and the output current of the second load.

6. In paragraph 5, The above first load is a load greater than the critical size, A battery system wherein the second load is a load less than the critical size.

7. In paragraph 5, At least one processor, When the input power is identified, the first switching element is turned on, and the second switching element, the third switching element, the fourth switching element, and the fifth switching element are turned off. Control the charger to perform CC charging for the second battery pack by turning off the sixth switching element and turning on the seventh switching element; When CC charging for the second battery pack is completed, the charger is controlled to perform CC charging for the first battery pack by turning on the sixth switching element and turning off the seventh switching element. When CC charging for the first battery pack is completed, the charger is controlled to turn off the sixth switching element and turn on the seventh switching element to perform CV charging for the second battery pack. A battery system that controls the charger to perform CV charging for the first battery pack by turning on the sixth switching element and turning off the seventh switching element when CV charging for the second battery pack is completed.

8. In paragraph 5, At least one processor, If the section where the input power is identified and the section where the input power is not identified are repeated, In a section where the input power is identified, the charger is controlled to perform CC charging for the first battery pack by turning on the first switching element and the sixth switching element and turning off the second switching element, the third switching element, the fourth switching element, the fifth switching element, and the seventh switching element. A battery system that controls the charger to perform CC charging for the second battery pack by turning on the second switching element, the third switching element, the fourth switching element, the fifth switching element, and the seventh switching element, and turning off the first switching element and the sixth switching element in a section where the input power is not identified, and performs discharging for the first battery pack.

9. In paragraph 5, At least one processor, When the output current of the first load and the output current of the second load are identified, the first switching element, the third switching element and the fourth switching element are turned off, and the second switching element and the fifth switching element are turned on. If the output current is less than the reference power, the sixth switching element is turned on and the seventh switching element is turned off to perform discharging of the first battery pack, A battery system, wherein when the output current is greater than or equal to the reference power, the sixth switching element is turned off and the seventh switching element is turned on to perform discharging of the second battery pack.

10. In paragraph 1, The above first battery pack, A first battery management module for obtaining status information of the first battery cell is included, The above second battery pack, A second battery management module that obtains status information of the second battery cell is included, At least one processor, A battery system that monitors battery status information received from the first battery management module and the second battery management module and controls CC charging and CV charging for the first battery pack and the second battery pack based on the monitoring results.

11. A method for controlling a battery system including a first battery pack including a first battery cell and a second battery pack including a second battery cell, When the input power is identified, a step of sequentially performing CC (constant current) charging for the second battery pack and the first battery pack; and A step of sequentially performing CV (constant voltage) charging on the second battery pack and the first battery pack after CC charging on the second battery pack and the first battery pack is completed; The discharge performance of the first battery pack is higher than the discharge performance of the second battery pack, A control method wherein the charging performance of the second battery pack is higher than the charging performance of the first battery pack.

12. In paragraph 11, A control method further comprising the step of sequentially performing discharge for the second battery pack and the first battery pack by turning on the first DC / DC converter for the first load connected to the first battery pack and the second DC / DC converter for the second load connected to the second battery pack when the input power is not identified.

13. In paragraph 12, The above battery system, A first switching element connected between the power supply and the charger; A first resistor connected to the first terminal of the first DC / DC converter; A second switching element connected to the first resistor; A third switching element connected between the first stage of the first DC / DC converter and the charger; A fourth switching element connected between the first stage of the second DC / DC converter and the charger; A second resistor connected to the first terminal of the first switching element between the third switching element and the fourth switching element; a third resistor connected to the first terminal of the second DC / DC converter; and A fifth switching element connected to the third resistor; A sixth switching element connected between the first DC / DC converter and the charger; and Further comprising a seventh switching element connected between the other end of the second DC / DC converter and the charger; The first battery pack is connected between the second stage of the first DC / DC converter and the sixth switching element, A control method wherein the second battery pack is connected between the second stage of the second DC / DC converter and the seventh switching element.

14. In paragraph 13, A step of monitoring the output current of a first load connected to a second terminal of the second switching element through the first resistor connected to one terminal of the second switching element; A step of monitoring the output current of a second load connected to the second terminal of the fifth switching element through the third resistor connected to the first terminal of the fifth switching element; and A control method further comprising: a step of controlling discharge of the first battery pack and the second battery pack based on the output current of the first load and the output current of the second load.

15. A non-transitory computer-readable medium storing computer instructions that, when executed by a processor of a battery system, cause the battery system to perform an operation, the computer instructions include a first battery pack including a first battery cell and a second battery pack including a second battery cell. The above action is, When the input power is identified, a step of sequentially performing CC (constant current) charging for the second battery pack and the first battery pack; and A step of sequentially performing CV (constant voltage) charging on the first battery pack and the second battery pack after CC charging on the second battery pack and the first battery pack is completed; The discharge performance of the first battery pack is higher than the discharge performance of the second battery pack, A non-transitory computer-readable medium wherein the charging performance of the second battery pack is higher than the charging performance of the first battery pack.

Images