KR20240023837A - Battery system for different types of batteries and controlling method thereof - Google Patents

Abstract

A battery system according to an embodiment of the present invention includes a first battery and a second battery having different outputs and capacities; a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging; and a battery management device that controls the switching circuit based on a predefined charging/discharging priority according to the operation mode and status information for at least one of the first and second batteries.

Description

Battery system including heterogeneous batteries and control method thereof {BATTERY SYSTEM FOR DIFFERENT TYPES OF BATTERIES AND CONTROLLING METHOD THEREOF}

The present invention relates to a battery system and a control method thereof, and more specifically, to a battery system including batteries with different outputs and capacities and a control method thereof.

Secondary batteries are batteries that can be reused by charging even after discharge, and can be used as an energy source for small devices such as portable phones, tablet PCs, and vacuum cleaners. They can also be used as ESS (Energy Storage) for personal mobility, automobiles, and smart grids. It is also used as a medium-to-large energy source such as a system).

Secondary batteries are used in the form of an assembly such as a battery module in which multiple battery cells are connected in series or parallel, or a battery pack in which battery modules are connected in series or parallel, depending on the requirements of the system.

Generally, a battery assembly is composed of battery cells of the same type and applied to a battery system. This type of battery assembly has limitations that make it difficult to efficiently respond to various output requirements on the load side. For example, in the case of ESS linked to home air conditioning equipment, an output of 10 to 20 kW is required within the first second, but ESS with low-output battery cells has limitations in efficiently responding to these initial requirements. If high-output battery cells (for example, batteries capable of output of 10C or more) are applied to respond to these initial requirements, the cost of the ESS increases, and long-term operation may become difficult due to poor battery cycle characteristics.

In order to solve these problems of the prior art, a battery system and its control technology that can efficiently respond to the output requirements of the load, significantly improve the operation period of the battery system, and operate stably are needed. .

Korean Patent Publication No. 10-2018-0090673

The purpose of the present invention to solve the above problems is to provide a battery system including a plurality of batteries with different outputs and capacities.

Another purpose of the present invention to solve the above problems is to provide a control method for such a battery system.

Another purpose of the present invention to solve the above problems is to provide a battery management device that controls the operation of such a battery system.

A battery system according to an embodiment of the present invention for achieving the above object includes a first battery and a second battery having different outputs and capacities; a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging; and a battery management device that controls the switching circuit based on a predefined charging/discharging priority according to the operation mode and status information for at least one of the first and second batteries.

Here, the first battery may be configured as a battery with higher output and lower capacity than the second battery.

When the battery system operates in a discharge mode, the battery management device supplies power to the load by discharging the first battery preferentially, and when a predefined high load condition is released, the output of the first battery is blocked. And, the switching circuit can be controlled so that the second battery is discharged and supplies power to the load.

When the battery system operates in a charging mode, the battery management device charges the second battery preferentially, and when the state of charge (SOC) of the second battery is greater than a predefined threshold, the battery management device The switching circuit may be controlled so that charging of the battery is stopped and the first battery is charged.

The switching circuit includes: a first switching circuit, one end of which is connected to the first battery, the other end of which is connected to the input/output terminal, and a first switch disposed between one end and the other end; a second switching circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a second switch disposed between one end and the other end; and a pre-charge circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a pre-charge resistor and a third switch connected in series between one end and the other end.

Here, when the battery system operates in a discharge mode, the battery management device controls the first switch to be in an ON state and the second and third switches to be in an OFF state, 1 The battery may be discharged preferentially to supply power to the load through the first switching circuit. Thereafter, when the predefined high load condition is released, the battery management device controls the third switch to be turned on and the first and second switches to be turned off, thereby turning the first battery on. The output may be blocked, and the second battery may supply power to the load through the pre-charge circuit. Thereafter, when the current flowing through the pre-charge circuit falls below a predefined threshold, the battery management device turns the second switch on and the first and third switches in the off state. By controlling, the second battery can supply power to the load through the second switching circuit.

When the battery system operates in a charging mode, the battery management device controls the second switch to be ON and the first and third switches to be OFF, so that the second battery is It can be charged preferentially through the second switching circuit. Thereafter, when the state of charge (SOC) of the second battery exceeds a predefined threshold, the battery management device turns the third switch ON and turns off the first and second switches. ) state, the second battery can be charged through the pre-charge circuit. Thereafter, when the difference between the external voltage value measured at the input/output terminal and the voltage value of the first battery becomes less than a predefined threshold, the battery management device turns the first switch to the ON state, By controlling the second and third switches to the OFF state, charging of the second battery can be stopped and the first battery can be charged through the first switching circuit.

A method of controlling a battery system according to an embodiment of the present invention for achieving the above other object includes a first battery and a second battery having different outputs and capacities; and a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging, based on a predefined charging and discharging priority according to the operation mode. Thus, electrically connecting one of the first and second batteries to the input/output terminal; collecting status information of a battery connected to the input/output terminal; and controlling the switching device to switch the battery connected to the input/output terminal based on the collected state information.

Here, the first battery may be configured as a battery with higher output and lower capacity than the second battery.

When the battery system operates in a discharge mode, the step of electrically connecting the one battery to the input/output terminal includes discharging the first battery preferentially to supply power to the load. It may include a step of electrically connecting to the input/output terminal. At this time, controlling the switching device may include determining whether a predefined high load condition has been released based on output state information of the first battery; and electrically connecting the second battery to the input/output terminal so that when the high load condition is released, the output of the first battery is blocked and the second battery is discharged to supply power to the load. can do.

When the battery system operates in a charging mode, the step of electrically connecting the one battery to the input/output terminal includes electrically connecting the second battery to the input/output terminal so that the second battery is charged preferentially. It may include; At this time, controlling the switching device includes comparing the state of charge (SOC) of the second battery with a predefined threshold; And when the state of charge (SOC) of the second battery exceeds a predefined threshold, charging of the second battery is stopped, and the first battery is electrically connected to the input/output terminal so that the first battery is charged. It may include a connecting step.

The switching circuit includes: a first switching circuit, one end of which is connected to the first battery, the other end of which is connected to the input/output terminal, and a first switch disposed between one end and the other end; a second switching circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a second switch disposed between one end and the other end; and a pre-charge circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a pre-charge resistor and a third switch connected in series between one end and the other end.

Here, when the battery system operates in a discharge mode, the step of electrically connecting the one battery to the input/output terminal means that the first battery is preferentially discharged and the power is supplied to the load through the first switching circuit. It may include controlling the first switch to be in an ON state and the second and third switches to be in an OFF state to supply . At this time, controlling the switching device may include determining whether a predefined high load condition has been released based on output state information of the first battery; When the high load condition is released, the output of the first battery is blocked, the third switch is turned on so that the second battery supplies power to the load through the pre-charge circuit, and the first battery is turned on. and 2 controlling the switch to the OFF state; and when the current flowing through the pre-charge circuit is below a predefined threshold, turning the second switch on so that the second battery supplies power to the load through the second switching circuit. It may include controlling the first and third switches to an OFF state.

When the battery system operates in a charging mode, the step of electrically connecting the one battery to the input/output terminal includes turning the second switch so that the second battery is preferentially charged through the second switching circuit. It may include controlling the first and third switches to be in an ON state and the first and third switches to be in an OFF state. At this time, controlling the switching device includes comparing the state of charge (SOC) of the second battery with a predefined threshold; When the state of charge (SOC) of the second battery is greater than or equal to a predefined threshold, the third switch is turned on so that the second battery is charged through the precharge circuit, and the first and 2 Controlling the switch to OFF state; and when the difference between the external voltage value measured at the input/output terminal and the voltage value of the first battery is less than or equal to a predefined threshold, the first switch is configured to charge the first battery through the first switching circuit. It may include controlling the second and third switches to the ON state and the second and third switches to the OFF state.

A battery management device according to an embodiment of the present invention for achieving the above still other object includes a first battery and a second battery having different outputs and capacities; and a switching circuit electrically connecting any one of the first and second batteries to an input/output terminal for charging and discharging. A battery management device located in a battery system including: at least one processor; It may include a memory that stores at least one instruction executed through the at least one processor.

Here, the at least one command includes: a command to electrically connect one of the first and second batteries to the input/output terminal based on a predefined charge/discharge priority according to an operation mode; A command to collect status information of a battery connected to the input/output terminal; and a command for controlling the switching device to switch the battery connected to the input/output terminal based on the collected state information.

According to the embodiment of the present invention as described above, it is possible to efficiently respond to the output requirements of the load and improve the operating period of the battery system.

1 is a block diagram for explaining a battery system according to the present invention.
Figure 2 is an operation flowchart of a method for controlling a battery system according to an embodiment of the present invention.
Figure 3 is an operation flowchart of a method for controlling a battery system operating in a discharge mode according to an embodiment of the present invention.
Figure 4 is an operation flowchart of a control method of a battery system operating in a charging control mode according to an embodiment of the present invention.
Figure 5 is a block diagram for explaining a battery system including a switching circuit according to an embodiment of the present invention.
Figure 6 is an operation flowchart of a method for controlling a battery system operating in a discharge mode according to another embodiment of the present invention.
Figure 7 is an operation flowchart of a method for controlling a battery system operating in a charging control mode according to another embodiment of the present invention.
Figure 8 is a block diagram of a battery management device according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be 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, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components.

Terms such as first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and similarly, the second component may also be named a first component without departing from the scope of the present invention. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Some terms used in this specification are defined as follows.

A battery cell is the smallest unit that stores power, and a battery module refers to an assembly of multiple battery cells electrically connected.

A battery pack or battery rack refers to a system with a minimal single structure that electrically connects module units set by the battery manufacturer and can be monitored and controlled through a BMS, including multiple battery modules and one BPU or protection device. It can be configured.

A battery bank may refer to a large-scale battery rack system set by connecting a plurality of battery racks in parallel. Monitoring and control of the rack BMS (RBMS) at the battery rack level can be performed through the BMS at the battery bank level.

A battery assembly refers to an assembly that includes a plurality of electrically connected battery cells and is applied to a specific system or device to function as a power source. Here, the battery assembly may mean a battery module, battery pack, battery rack, or battery bank, but the scope of the present invention is not limited to these entities.

SOC (State of Charge; Charging Rate) expresses the current charged state of the battery as a percentage [%], and SOH (State of Health; Remaining Rate) expresses the current remaining state of the battery as a percentage [%].

Nominal Capacity (Nominal Capa.) may refer to the battery capacity set by the battery manufacturer during development.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

1 is a block diagram for explaining a battery system according to the present invention.

Referring to FIG. 1 , the battery system may include a first battery 100, a second battery 200, a switching circuit 300, and a battery management device 400.

In the present invention, the first battery 100 and the second battery 200 may be composed of batteries with different outputs and capacities. Here, the first battery 100 may be configured as a battery with higher output and lower capacity than the second battery 200. That is, the first battery 100 may be a relatively high-output, low-capacity battery, and the second battery 200 may be a relatively low-output, high-capacity battery.

For example, the first battery 100 may be a battery that exhibits an output performance of 10C or more and has a rated capacity of 2kWh, and the second battery 200 may be a battery that exhibits an output performance of 1C or less and has a rated capacity of 8kWh. You can. Meanwhile, these examples are for a clear understanding of the present invention, and the scope of rights of the present invention should be construed as not limited to these examples.

In the present invention, the first battery 100 and the second battery 200 may each refer to a battery cell unit or a battery assembly unit. For example, the first battery 100 may refer to a first type (high output, low capacity) battery cell, and the second battery 100 may refer to a second type (low output, high capacity) battery cell. For another example, the first battery 100 is a first type (high output, low capacity) battery module (or pack) composed of a plurality of battery cells, and the second battery 100 is a second type (or pack) composed of a plurality of battery cells. It may refer to a low-output, high-capacity battery module (or pack).

The switching circuit 300 is a device that electrically connects one of the first and second batteries 100 and 200 to an input/output terminal (T) for charging and discharging. Here, the switching circuit 300 may be configured to include a plurality of switches for electrically connecting any one of the first and second batteries 100 and 200 to the input/output terminal (T).

The input/output terminal T may be configured to transfer power discharged from the battery to the load when the battery system is in a discharge mode, and to transfer power delivered from an external power source to the battery when the battery system is in a charge mode. For example, one side of the input/output terminal (T) may be connected to the switching circuit 300 as shown in FIG. 2, and the other side of the input/output terminal (T) may be connected to an inverter (not shown). Here, the input/output terminal (T) can transmit power discharged from the battery to the inverter when the battery system is in a discharge mode, and can transmit power input from the inverter to the battery when the battery system is in a charge mode.

The battery management device 400 is a device that controls the switching circuit 400. Here, the battery management device 200 may correspond to a BMS located inside the battery system or may be implemented by being included in the BMS.

The battery management device 400 controls the switching circuit 300 based on a predefined charging/discharging priority according to the operation mode and status information for at least one of the first and second batteries 100 and 200. can do. Here, the battery management device 400 may be connected to at least one sensor for collecting status information (e.g., voltage, current, etc.) of the first and second batteries 100 and 200, and the collected sensing The value can be used to calculate specific state information (for example, SOC, etc.).

According to an embodiment of the present invention, when the battery system operates in a discharge mode, the first battery 100, which is a high-output, low-capacity battery, is discharged preferentially, and when a predefined condition is satisfied, the first battery 100 is discharged preferentially. 100 may be set to be cut off and the second battery 200, a low-output, high-capacity battery, to be discharged. According to another embodiment of the present invention, when the battery system operates in a charging mode, the second battery 200, which is a low-output, high-capacity battery, is charged preferentially, and when a predefined condition is satisfied, the second battery 200 is charged first. Charging of the battery 100 may be blocked, and the first battery 100, which is a high-output, low-capacity battery, may be set to be charged.

Hereinafter, with reference to FIGS. 2 to 7, the control method of the battery system according to the present invention and various embodiments of the present invention will be described in detail.

Figure 2 is an operation flowchart of a method for controlling a battery system according to an embodiment of the present invention.

The battery management device 400 checks the operation mode (discharge mode or charge mode) of the battery system (S210).

The battery management device 400 connects the battery with priority among the first and second batteries 100 and 200 to the input/output terminal T according to a predefined charging/discharging priority for each operation mode ( S220). For example, in discharging mode, the first battery 100 with high output and low capacity may be defined as first priority, and in charging mode, the second battery 200 with low output and high capacity may be defined as first priority.

The battery management device 400 collects status information about the battery connected to the input/output terminal (T) (S230). Here, the status information may correspond to status information related to battery switching conditions.

The battery management device 400 checks whether predefined battery switching conditions are satisfied based on the collected state information (S240). For example, in the case of discharge mode, the battery switching condition is defined as a state in which the output power of the first battery 100 is less than or equal to a predefined threshold (e.g., 10 kW) (i.e., the high load condition is released). It can be. Here, the battery management device 400 may monitor the output power of the first battery 100 every predefined unit time to check whether the battery switching condition is satisfied.

When the predefined battery switching condition is satisfied, the battery management device 400 switches the switching circuit ( 300) is controlled (S250). In the above example, when the output power of the first battery 100 is 10kW or less and the high load condition is released, the battery management device 400 controls the switching circuit 300 to connect the first battery 100 and the input/output The terminal (T) can be disconnected, and the second battery 200 can be connected to the input/output terminal (T).

Figure 3 is an operation flowchart of a method for controlling a battery system operating in a discharge mode according to an embodiment of the present invention.

When the battery system operates in a discharge mode, the battery management device 400 connects the first battery 100 to the input/output terminal ( T) (S310).

Afterwards, the battery management device 400 collects status information about the first battery 100 . Here, the battery management device 400 may collect status information about at least one of current, voltage, and output power of the first battery 100.

Thereafter, the battery management device 400 may check whether the predefined high load condition is released based on the collected state information (S320). Here, the high load condition may be defined as a state in which the output power value (P_bat1) of the first battery 100 exceeds the predefined threshold value (P_s).

When the predefined high load condition is released (P_bat1 ≤ P_s), the battery management device 400 blocks the output of the first battery 100, discharges the low-output, high-capacity second battery 200, and supplies power to the load. The switching circuit 300 is controlled to supply the battery connected to the input/output terminal (T) to the second battery 200 (S330).

According to the above embodiment, a high-output, low-capacity battery with relatively poor cycle characteristics is operated at the beginning of discharging when high output is required, and then, in situations where stable output is required, the low-output, high-capacity battery is operated, thereby making it more efficient to meet the required output of the load. Response is possible and the operating period of the battery system can be improved.

Figure 4 is an operation flowchart of a control method of a battery system operating in a charging control mode according to an embodiment of the present invention.

When the battery system operates in charging mode, the battery management device 400 connects the second battery 200 to the input/output terminal (T) so that the low-output, high-capacity second battery 200 is charged preferentially ( S410).

Thereafter, the battery management device 400 may collect state information about the second battery 200 and calculate the state of charge (SOC) of the second battery 200 based on the collected state information. For example, the battery management device 400 collects the open-circuit voltage value (OCV) of the second battery 200 and determines the state of charge (SOC) of the second battery 200 based on the open-circuit voltage value (OCV). can be calculated. Meanwhile, these examples are for understanding of the present invention and are not intended to limit the scope of the present invention. Of course, the state of charge (SOC) can be calculated using state information other than the open-circuit voltage value (OCV). am.

Thereafter, the battery management device 400 compares the state of charge (SOC_bat2) of the second battery 200 with a predefined threshold (SOC_s) (eg, 95%) (S420).

When the state of charge (SOC) of the second battery is greater than or equal to a predefined threshold (SOC_bat2 ≥ SOC_s), the battery management device 400 stops charging the second battery 200 and recharges the first battery 100. The switching circuit 300 is controlled so that the battery connected to the input/output terminal (T) is switched to the first battery 100 (S430).

Figure 5 is a block diagram for explaining a battery system including a switching circuit according to an embodiment of the present invention.

Referring to FIG. 5 , the switching circuit 300 may include a first switching circuit 310, a second switching circuit 320, and a precharge circuit 330.

The first switching circuit 310 is configured such that one end is connected to the first battery 100 and the other end is connected to the input/output terminal (T), and a first switch is provided between one end and the other end of the first switching circuit 310. (S1) can be placed.

The second switching circuit 320 is configured such that one end is connected to the second battery 200 and the other end is connected to the input/output terminal (T), and a second switch is installed between one end and the other end of the second switching circuit 320. (S2) can be placed.

The precharge circuit 330 is configured to have one end connected to the second battery 200 and the other end connected to the input/output terminal (T), and a precharge resistance (Rp) between one end and the other end of the precharge circuit 330. ) and the third switch (S3) may be arranged in series.

Hereinafter, with reference to FIGS. 6 and 7, a method of controlling a battery system including the switching circuit 300 shown in FIG. 5 will be described in detail.

Figure 6 is an operation flowchart of a method for controlling a battery system operating in a discharge mode according to another embodiment of the present invention.

When the battery system operates in a discharge mode, the battery management device 400 turns the first switch S1 on and the second switch S2 and the third switch S3 off. By controlling the state, the first battery 100 is preferentially discharged to supply power to the load through the first switching circuit 310 (S610).

Afterwards, the battery management device 400 collects status information about the first battery 100 . Here, the battery management device 400 may collect status information about at least one of current, voltage, and output power of the first battery 100.

Thereafter, the battery management device 400 may check whether the predefined high load condition is released based on the collected state information (S620). Here, the high load condition may be defined as a state in which the output power value (P_bat1) of the first battery 100 exceeds the predefined threshold value (P_s).

When the predefined high load condition is released (P_bat1 ≤ P_s), the battery management device 400 turns on the third switch S3 and turns the first switch S1 and the second switch S2 on. By controlling it to the OFF state, the output of the first battery 100 is blocked and the second battery 200 supplies power to the load through the pre-charge circuit 330 (S630).

Thereafter, the battery management device 400 may collect the output current value for the second battery 200. Here, the battery management device 400 may monitor the output current of the second battery 200 through a current sensor that senses the current flowing through the precharge circuit 330.

The battery management device 400 compares the output current (I_prech) of the second battery 200 with a predefined threshold (I_s) (eg, 1A) (S640).

When the output current of the second battery 200 is below a predefined threshold (I_prech ≤ I_s), the battery management device 400 turns on the second switch S2 and turns the first switch ( S1) and the third switch S3 are controlled to be OFF, so that the second battery 200 supplies power to the load through the second switching circuit 320 (S650).

According to this embodiment, it is possible to control the first battery 100 and the second battery 200 so that they are not discharged at the same time, and at the same time, prevent an internal short circuit due to the voltage difference between the first battery 100 and the second battery 200. It can be prevented.

Figure 7 is an operation flowchart of a method for controlling a battery system operating in a charging control mode according to another embodiment of the present invention.

When the battery system operates in charging mode, the battery management device 400 keeps the second switch S2 in the ON state and the first switch S1 and the third switch S3 in the OFF state. is controlled so that the second battery 200 is preferentially charged through the second switching circuit 320 (S710).

Thereafter, the battery management device 400 collects state information about the second battery 200 and calculates the state of charge (SOC) of the second battery 200 based on the collected state information.

Thereafter, the battery management device 400 compares the state of charge (SOC_bat2) of the second battery 200 with a predefined threshold (SOC_s) (eg, 95%) (S720).

When the state of charge (SOC) of the second battery is greater than or equal to a predefined threshold (SOC_bat2 ≥ SOC_s), the battery management device 400 turns on the third switch (S3) and turns the first switch ( S1) and the second switch S2 are controlled to be OFF, so that the second battery 200 is charged through the pre-charge circuit 330 (S730).

Thereafter, the battery management device 400 may collect the voltage value of the first battery 100 and the external voltage value measured at the input/output terminal (T). Here, the external voltage value may correspond to the output voltage value of the inverter.

Thereafter, the battery management device 400 compares the difference between the external voltage value (V_inv) and the voltage value (V_bat1) of the first battery 100 with a predefined threshold (V_s) (S740).

When the difference between the external voltage value and the voltage value of the first battery 100 is less than or equal to a predefined threshold (V_inv - V_bat1 ≤ V_s), the battery management device 400 turns on the first switch S1. ) state, the second switch S2 and the third switch S3 are controlled to be OFF, so that the first battery 100 is charged through the first switching circuit 310 (S750).

According to this embodiment, the first battery 100 and the second battery 200 can be controlled not to be charged at the same time, and an internal short circuit due to a voltage difference between the first battery 100 and the inverter can be prevented.

Figure 8 is a block diagram of a battery management device according to an embodiment of the present invention.

A battery management device 400 according to an embodiment of the present invention includes a first battery and a second battery having different outputs and capacities; and a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging; at least one processor 410, executed through the processor. It may include a memory 420 that stores at least one command, and a transmitting and receiving device 430 that is connected to a network and performs communication.

The at least one command may include a command for electrically connecting one of the first and second batteries to the input/output terminal based on a predefined charge/discharge priority according to an operation mode; A command to collect status information of a battery connected to the input/output terminal; and a command for controlling the switching device to switch the battery connected to the input/output terminal based on the collected state information.

The battery management device 400 may further include an input interface device 440, an output interface device 450, a storage device 460, etc. Each component included in the battery management device 400 is connected by a bus 470 and can communicate with each other.

Here, the processor 410 may refer to 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. . Memory (or storage device) may be comprised of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory may consist of at least one of read only memory (ROM) and random access memory (RAM).

The operation of the method according to an embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store data that can be read by a computer system. Additionally, computer-readable recording media can be distributed across networked computer systems so that computer-readable programs or codes can be stored and executed in a distributed manner.

Although some aspects of the invention have been described in the context of an apparatus, it may also refer to a corresponding method description, where a block or device corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by corresponding blocks or items or features of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as a microprocessor, programmable computer, or electronic circuit, for example. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

Although the present invention has been described with reference to preferred embodiments of the present invention, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it is possible.

100: first battery
200: second battery
300: switching circuit
310: first switching circuit
320: second switching circuit
330: Precharge circuit
400: Battery management device

Claims (15)

A first battery and a second battery having different outputs and capacities;
a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging; and
A battery system comprising: a battery management device that controls the switching circuit based on a predefined charging/discharging priority according to an operation mode and status information for at least one of the first and second batteries. In claim 1,
The first battery,
A battery system consisting of a battery with higher output and lower capacity than the second battery. In claim 2,
When the battery system operates in discharge mode,
The battery management device,
The first battery is preferentially discharged to supply power to the load, and when a predefined high load condition is released, the output of the first battery is blocked and the second battery is discharged to supply power to the load, A battery system that controls the switching circuit. In claim 2,
When the battery system operates in charging mode,
The battery management device,
The second battery is charged preferentially, and when the state of charge (SOC) of the second battery exceeds a predefined threshold, charging of the second battery is stopped and the switching is performed so that the first battery is charged. Battery system controlling circuit. In claim 1,
The switching circuit is,
a first switching circuit, one end of which is connected to the first battery, the other end of which is connected to the input/output terminal, and a first switch disposed between one end and the other end;
a second switching circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a second switch disposed between one end and the other end; and
A pre-charge circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a pre-charge resistor and a third switch connected in series between one end and the other end. In claim 5,
When the battery system operates in discharge mode,
The battery management device,
Controlling the first switch to the ON state and the second and third switches to the OFF state so that the first battery is preferentially discharged to supply power to the load through the first switching circuit. do,
When the predefined high load condition is released, the third switch is controlled to be turned on and the first and second switches are controlled to be turned off, so that the output of the first battery is blocked, and the second switch is turned on. Allow the battery to supply power to the load through the pre-charge circuit,
When the current flowing through the precharge circuit is below a predefined threshold, the second switch is controlled to be turned on and the first and third switches are controlled to be turned off, thereby discharging the second battery. A battery system that supplies power to the load through the second switching circuit. In claim 5,
When the battery system operates in charging mode,
The battery management device,
Controlling the second switch to the ON state and the first and third switches to the OFF state so that the second battery is preferentially charged through the second switching circuit,
When the state of charge (SOC) of the second battery is greater than or equal to a predefined threshold, the third switch is controlled to be turned on and the first and second switches are controlled to be turned off. 2 Allow the battery to be charged through the pre-charge circuit,
When the difference between the external voltage value measured at the input/output terminal and the voltage value of the first battery is less than a predefined threshold, the first switch is turned on and the second and third switches are turned off. (OFF) state, so that charging of the second battery is stopped and the first battery is charged through the first switching circuit. A first battery and a second battery having different outputs and capacities; and a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging,
electrically connecting one of the first and second batteries to the input/output terminal based on a predefined charge/discharge priority according to an operation mode;
collecting status information of a battery connected to the input/output terminal; and
Based on the collected state information, controlling the switching device to switch the battery connected to the input/output terminal. In claim 8,
The first battery,
A method of controlling a battery system comprising a battery with higher output and lower capacity than the second battery. In claim 9,
When the battery system operates in discharge mode,
The step of electrically connecting one of the batteries to the input/output terminal,
Comprising: electrically connecting the first battery to the input/output terminal so that the first battery is preferentially discharged to supply power to the load,
The step of controlling the switching device is,
determining whether a predefined high load condition has been released based on output state information of the first battery; and
When the high load condition is released, electrically connecting the second battery to the input/output terminal so that the output of the first battery is blocked and the second battery is discharged to supply power to the load. , Control method of battery system. In claim 9,
When the battery system operates in charging mode,
The step of electrically connecting one of the batteries to the input/output terminal,
Comprising: electrically connecting the second battery to the input/output terminal so that the second battery is charged preferentially,
The step of controlling the switching device is,
Comparing the state of charge (SOC) of the second battery with a predefined threshold; and
When the state of charge (SOC) of the second battery exceeds a predefined threshold, charging of the second battery is stopped, and the first battery is electrically connected to the input/output terminal so that the first battery is charged. A method of controlling a battery system, including the step of: In claim 8,
The switching circuit is,
a first switching circuit, one end of which is connected to the first battery, the other end of which is connected to the input/output terminal, and a first switch disposed between one end and the other end;
a second switching circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a second switch disposed between one end and the other end; and
Control of the battery system, including a pre-charge circuit, one end of which is connected to the second battery, the other end of which is connected to the input/output terminal, and a pre-charge resistor and a third switch connected in series between one end and the other end. method. In claim 12,
When the battery system operates in discharge mode,
The step of electrically connecting one of the batteries to the input/output terminal,
Controlling the first switch to be turned on and the second and third switches to be turned off so that the first battery is preferentially discharged to supply power to the load through the first switching circuit. Including steps;
The step of controlling the switching device is,
determining whether a predefined high load condition has been released based on output state information of the first battery;
When the high load condition is released, the output of the first battery is blocked, the third switch is turned on so that the second battery supplies power to the load through the pre-charge circuit, and the first battery is turned on. and 2 controlling the switch to the OFF state; and
When the current flowing through the pre-charge circuit is below a predefined threshold, the second switch is turned on so that the second battery supplies power to the load through the second switching circuit. A method of controlling a battery system comprising: controlling the first and third switches to be in an OFF state. In claim 12,
When the battery system operates in charging mode,
The step of electrically connecting one of the batteries to the input/output terminal,
A step of controlling the second switch to be turned on and the first and third switches to be turned off so that the second battery is preferentially charged through the second switching circuit,
The step of controlling the switching device is,
Comparing the state of charge (SOC) of the second battery with a predefined threshold;
When the state of charge (SOC) of the second battery is greater than or equal to a predefined threshold, the third switch is turned on so that the second battery is charged through the precharge circuit, and the first and 2 Controlling the switch to OFF state; and
When the difference between the external voltage value measured at the input/output terminal and the voltage value of the first battery is less than or equal to a predefined threshold, the first switch is turned on so that the first battery is charged through the first switching circuit. A method of controlling a battery system comprising: controlling the second and third switches to an ON state and the second and third switches to an OFF state. A first battery and a second battery having different outputs and capacities; and a switching circuit that electrically connects one of the first and second batteries to an input/output terminal for charging and discharging. A battery management device located in a battery system comprising:
at least one processor;
Includes a memory that stores at least one instruction executed through the at least one processor,
The at least one command is:
A command to electrically connect one of the first and second batteries to the input/output terminal based on a predefined charge/discharge priority according to an operation mode;
A command to collect status information of a battery connected to the input/output terminal; and
A battery management device comprising: a command for controlling the switching device to switch the battery connected to the input/output terminal based on the collected state information.