Battery charging and discharging device, battery charging and discharging method, and computer program

Abstract

To provide a battery charging and discharging device that effectively charges and discharges a battery included in a device having a motor.SOLUTION: A device for charging and discharging a battery included in a device having a motor includes a first cell 110 that is discharged when the device travels and supplies electric power to the motor of the device, a second cell 120 that is charged with the electric power supplied from the motor by regeneration braking when the device is decelerated, a first switch 180 included in a charging and discharging path of the first cell, a second switch 190 included in a charging and discharging path of the second cell 120, and a processor 160 that is electrically connected to the first switch 180 and the second switch 190, sections the first cell 110 and the second cell 120 when the first cell 110 and the second cell 120 are charged and discharged, and controls the charging and discharging of the first cell 110 and the second cell 120.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a battery charging and discharging device, a battery charging and discharging method, and a computer program for charging and discharging a battery provided in a device including a motor.

Background Art

[0002] Recently, the demand for portable electronic products such as notebook computers, video cameras, and mobile phones has increased rapidly. As the development of energy-saving storage batteries, robots, satellites, etc. has become full-scale, research on high-performance secondary batteries capable of repeated charging and discharging has been actively promoted.

[0003] Such a secondary battery is provided in a device including a motor (for example, an electric bicycle (e-bike)) and can drive the motor of the electric bicycle. However, in order to improve the traveling distance of the electric bicycle, a method such as increasing the capacity of the battery has been applied.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the present invention is to provide a battery charging and discharging device, a battery charging and discharging method, and a computer program for charging and discharging a battery provided in a device including a motor. However, such problems are exemplary and do not limit the scope of the present invention.

Means for Solving the Problems

[0005] As a technical means for achieving the foregoing technical problems, in a device for charging and discharging a battery provided in a device equipped with a motor, a first cell that discharges during running of the device and supplies power to the motor of the device, and a second cell that is charged by receiving power from the motor during deceleration of the device by regenerative braking. A battery charging and discharging device is provided that includes a first switch provided on the charging and discharging path of the first cell, a second switch provided on the charging and discharging path of the second cell, and is electrically connected to the first switch and the second switch. When charging and discharging the first cell and the second cell, the first cell and the second cell are separated, and a processor that controls the charging and discharging of the first cell and the second cell is included.

[0006] According to an example, the first cell and the second cell may have different battery charge-discharge rates (C-rates).

[0007] According to another example, the battery charge-discharge rate of the second cell is higher than that of the first cell.

[0008] According to still another example, the processor obtains a connection signal of an external charger of the device or a regenerative charging mode signal due to deceleration of the device, measures a charging current on a charging and discharging path connected to the external charger or the motor, and based on the connection signal of the external charger, the regenerative charging mode signal, and the magnitude of the charging current, determines a charging cell to be charged among the first cell and the second cell, and can control the charging of the charging cell.

[0009] According to still another example, when the processor obtains the regenerative charging mode signal, the second cell can be determined as the charging cell, and the charging of the second cell can be controlled.

[0010] According to still another example, the processor obtains a running mode signal due to acceleration of the device, measures the voltages of the first cell and the second cell based on the running mode signal, determines a discharging cell with a higher voltage among the first cell and the second cell, and can control the discharging of the discharging cell.

[0011] According to still another example, the processor may obtain a sleep mode signal due to a sleep state of the device, measure voltages of the first cell and the second cell based on the sleep mode signal, and if the voltage of the second cell is higher than the voltage of the first cell, discharge the second cell and control charging of the first cell.

[0012] As a technical means for achieving the above technical problem, in a method for charging and discharging a battery provided in a device including a motor, a first switch provided on a charging and discharging path of a first cell that discharges during running of the device and supplies power to the motor of the device, and a second switch provided on a charging and discharging path of a second cell that is charged by receiving power from the motor during deceleration of the device by regenerative braking are controlled, and during charging and discharging of the first cell and the second cell, the first cell and the second cell are classified and charging and discharging of the first cell and the second cell are controlled. A battery charging and discharging method is provided.

[0013] According to an example, the step of controlling charging and discharging of the first cell and the second cell may also include a step in which battery charging and discharging rates (C-rates) of the first cell and the second cell are different from each other.

[0014] According to another example, the step of controlling charging and discharging of the first cell and the second cell may also include a step in which the battery charging and discharging rate of the second cell is higher than the battery charging and discharging rate of the first cell.

[0015] According to still another example, the step of controlling charging and discharging of the first cell and the second cell includes obtaining a connection signal of an external charger of the device or a regenerative charging mode signal due to deceleration of the device, measuring a charging current on a charging and discharging path connected to the external charger or the motor, and based on the connection signal of the external charger, the regenerative charging mode signal, and the magnitude of the charging current, determining a charging cell to be charged among the first cell and the second cell, and controlling charging of the charging cell.

[0016] According to still another example, the step of controlling the charging of the charging cell includes determining the second cell as the charging cell and controlling the charging of the second cell when the regenerative charging mode signal is obtained.

[0017] According to still another example, the step of controlling the charge and discharge of the first cell and the second cell includes obtaining a driving mode signal due to acceleration of the device, measuring the voltages of the first cell and the second cell based on the driving mode signal, and determining a discharging cell having a higher voltage among the first cell and the second cell, and controlling the discharging of the discharging cell.

[0018] According to still another example, the step of controlling the charge and discharge of the first cell and the second cell includes obtaining a sleep mode signal due to the sleep state of the device, measuring the voltages of the first cell and the second cell based on the sleep mode signal, and discharging the second cell and controlling the charging of the first cell when the voltage of the second cell is higher than the voltage of the first cell.

[0019] As a technical means for achieving the above-described technical problem, there is provided a computer program stored in a recording medium for causing a computing device to execute the above-described method.

Advantages of the Invention

[0020] According to the present invention, it is possible to provide a battery charging device, a battery charging method, and a computer program that effectively charge and discharge a battery provided in a device including a motor. Further, according to the present invention, it is possible to improve the driving distance of the device, ensure the safety of the battery provided in the device, and increase the lifespan. Needless to say, such effects do not limit the scope of the present invention.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0022] In the following, with reference to the accompanying drawings, various embodiments will be described in detail so that those having ordinary knowledge in the technical field to which the present disclosure pertains can easily implement them. However, since the technical idea of the present disclosure can be embodied in various forms and modified, it is not limited to the embodiments described in this specification. In the description of the embodiments disclosed in this specification, when it is determined that a specific description of related known technologies makes the gist of the technical idea of the present disclosure unclear, the specific description related to those known technologies will be omitted. The same or similar components are given the same reference numerals, and the overlapping descriptions related to them are omitted.

[0023] In this specification, when an element is described as being "connected" to another element, it includes not only the case where it is "directly connected", but also the case where other elements are interposed in between and it is "indirectly connected". When an element is said to "include" another element, it means that, unless otherwise specified to the contrary, it does not exclude further other elements in addition to the other element, but also further includes those further other elements.

[0024] One embodiment can be described by a functional block configuration and various processing steps. Some or all of such functional blocks can be implemented by various numbers of hardware configurations and / or software configurations that execute specific functions. For example, the functional blocks of the present disclosure can be implemented by one or more microprocessors, or can be implemented by a circuit configuration for a predetermined function. The functional blocks of the present disclosure can be implemented by various programming languages or scripting languages. The functional blocks of the present disclosure can be implemented by an algorithm executed by one or more processors. The functions performed by the functional blocks of the present disclosure can be performed by a plurality of functional blocks, or in the present disclosure, the functions performed by a plurality of functional blocks can also be performed by one functional block. Also, the present disclosure can adopt the prior art for electronic environment setting, signal processing, and / or data processing, etc.

[0025] FIG. 1 is a drawing schematically illustrating a battery pack according to an embodiment of the present invention.

[0026] Referring to FIG. 1, the battery pack 100 also includes a first cell 110, a second cell 120, a processor 160, a memory 170, a voltage measurement unit 130, a current measurement unit 140, and a temperature measurement unit 150. Also, the battery pack 100 also includes a first switch 180 and a second switch 190. However, the present invention is not limited thereto, and the configuration of FIG. 1 is also an example of a battery pack included in a device equipped with a motor of the present invention. For example, a device equipped with a motor according to the present invention can represent a device including an electric bicycle (e-bike), etc.

[0027] The first cell 110 and the second cell 120 are also rechargeable secondary batteries. For example, the first cell 110 and the second cell 120 include at least one selected from the group consisting of a nickel-cadmium battery, a lead storage battery, a nickel metal hydride battery (NiMH), a lithium ion battery, a lithium polymer battery, and the like.

[0028] The number and connection method of the battery cells included in the first cell 110 and the second cell 120 can be determined based on the required power and voltage of the battery pack 100, etc. In FIG. 1, for merely conceptual purposes, the battery cells 111, 121 are illustrated as being connected in series, but the battery cells 111, 121 can be connected in parallel with each other, or connected in series and in parallel. In FIG. 1, the first cell 110 and the second cell 120 are illustrated as including a plurality of battery cells 111, 121, but the first cell 110 and the second cell 120 can include one battery cell 111, 121.

[0029] The battery pack 100 also includes a pair of pack terminals 101, 102 to which an electrical load or a charging device can be connected. For example, a motor of the device can be connected to the pack terminals 101, 102. Also, an external charger of the device can be connected to the pack terminals 101, 102.

[0030] The battery charging and discharging device according to an embodiment of the present invention also includes a hybrid cell. According to the present invention, the battery charging and discharging device according to an embodiment of the present invention can utilize the hybrid cell to improve the regenerative charging efficiency and increase the moving distance of the device due to the increased capacity. For example, as illustrated in FIG. 1, the battery pack 100 according to the present invention also includes a hybrid cell including the first cell 110 and the second cell 120.

[0031] The first cell 110 is also a battery that discharges during the running of the device and supplies power to the motor of the device. Also, the second cell 120 is also a battery that is charged by receiving power from the motor during deceleration of the device by regenerative braking.

[0032] The first cell and the second cell according to an embodiment of the present invention are also batteries having different battery charge-discharge rates (C-rates) from each other. Also, the battery charge-discharge rate of the second cell is higher than the battery charge-discharge rate of the first cell.

[0033] For example, the first cell 110 is a battery used for general running of the device, and the second cell 120 is also a battery used for regenerative charging of the device. In that case, the second cell 120 is also a high-output cell having a high battery charge-discharge rate (C-rate) for improving the charging efficiency with a regenerative charging current larger than the charging current by an external charger of the device. For example, the second cell 120 is also a battery having a charge-discharge rate of 1.33C. Also, the first cell 110 is also a battery having a charge-discharge rate of 0.5C.

[0034] The battery charge-discharge device according to an embodiment of the present invention divides the first cell 110 and the second cell 120 and can charge or discharge the first cell 110 and the second cell 120. For example, the battery charge-discharge device according to an embodiment of the present invention can selectively control the first switch 180 and the second switch 190 to charge or discharge the first cell 110 and the second cell 120. For example, as illustrated in FIG. 1, the first switch 180 can be provided on the charge-discharge path of the first cell 110. Also, the second switch 190 can be provided on the charge-discharge path of the second cell 120.

[0035] The battery pack 100 according to an embodiment of the present invention may further include a main switch. For example, the main switch may be connected between the first cell 110 and the second cell 120 and one of the pack terminals 101, 102 (for example, the pack terminal 101). Also, the main switch may be controlled by the processor 160. Although not shown in FIG. 1, the battery pack 100 may further include a battery protection circuit, a fuse, a current sensor, and the like.

[0036] The battery charging and discharging device according to an embodiment of the present invention may also include a processor 160 and a memory 170.

[0037] The processor 160 controls the overall operation of the battery charging and discharging device. For example, the processor 160 may be embodied in a form that selectively includes a processor known in the art, an application specific integrated circuit (ASIC), other chip sets, logic circuits, registers, communication modems, and / or data processing devices to perform the above-described operations.

[0038] The processor 160 performs basic arithmetic, logic, and input / output operations, and may execute, for example, program codes stored in the memory 170. The processor 160 may store data in the memory 170 or load data stored in the memory 170.

[0039] Memory 170 is a recording medium that can be read by processor 160, and also includes non-volatile mass storage devices such as RAM (random access memory), ROM (read-only memory), and disk drives. The operating system (OS) and at least one program or application code can be stored in memory 170. Data generated by measuring at least one parameter of the first cell 110 and the second cell 120 can be stored in memory 170. For example, the data may include the charge and discharge current, terminal voltage, and / or temperature of the battery.

[0040] The voltage measurement unit 130 can be configured to measure the voltages of the first cell 110 and the second cell 120. For example, the voltage measurement unit 130 can be electrically connected to both ends of the first cell 110 and the second cell 120. Also, the voltage measurement unit 130 can be electrically connected to the processor 160 so as to exchange electrical signals. Further, under the control of the processor 160, the voltage measurement unit 130 can measure the voltages at both ends of the first cell 110 and the second cell 120 at time intervals, and output a signal indicating the magnitude of the measured voltage to the processor 160. At this time, the processor 160 can determine the voltages of the first cell 110 and the second cell 120 from the signal output from the voltage measurement unit 130. For example, the voltage measurement unit 130 can be implemented using a voltage measurement circuit commonly used in the industry.

[0041] Further, the current measurement unit 140 may be configured to measure the charge and discharge currents of the first cell 110 and the second cell 120. For example, the current measurement unit 140 may be electrically connected to a current sensor provided on the charge and discharge paths of the first cell 110 and the second cell 120. Also, the current measurement unit 140 may be electrically connected to the processor 160 so as to be able to exchange electrical signals. Further, under the control of the processor 160, the current measurement unit 140 may repeatedly measure the magnitudes of the charge current or the discharge current of the first cell 110 and the second cell 120 at time intervals, and output a signal indicating the magnitude of the measured current to the processor 160. At this time, the processor 160 may determine the magnitude of the current from the signal output from the current measurement unit 140. For example, the current sensor may be implemented using a Hall sensor or a sense resistor commonly used in the industry.

[0042] The temperature measurement unit 150 may be configured to measure the temperatures of the first cell 110 and the second cell 120. For example, the temperature measurement unit 150 may be connected to the first cell 110 and the second cell 120 and measure the temperatures of the secondary batteries provided in the first cell 110 and the second cell 120. Also, the temperature measurement unit 150 may be electrically connected to the processor 160 so as to be able to exchange electrical signals. Further, at time intervals, the temperature measurement unit 150 may repeatedly measure the temperature of the secondary battery and output a signal indicating the magnitude of the measured temperature to the processor 160. At this time, the processor 160 may determine the temperature of the secondary battery from the signal output from the temperature measurement unit 150. For example, the temperature measurement unit 150 may be implemented using a thermocouple commonly used in the industry.

[0043] The processor 160 is electrically connected to the first switch 180 and the second switch 190 and can exchange signals. Also, when the first cell 110 and the second cell 120 are charged and discharged, the processor 160 may classify the first cell 110 and the second cell 120 and control the charge and discharge of the first cell 110 and the second cell 120. For example, the processor 160 may selectively control the first switch 180 and the second switch 190 to control the charge and discharge of the first cell 110 and the second cell 120.

[0044] For example, the processor 160 closes (turns ON) the first switch 180, opens (turns OFF) the second switch 190, discharges only the first cell 110, and does not discharge the second cell 120. Also, the processor 160 closes (turns ON) the second switch 190, opens (turns OFF) the first switch 180, discharges only the second cell 120, and does not discharge the first cell 110.

[0045] For example, the processor 160 closes (turns ON) the first switch 180, opens (turns OFF) the second switch 190, charges only the first cell 110, and does not charge the second cell 120. Also, the processor 160 closes (turns ON) the second switch 190, opens (turns OFF) the first switch 180, charges only the second cell 120, and does not charge the first cell 110.

[0046] FIG. 2 is a flowchart for explaining a battery charging and discharging method according to an embodiment of the present invention.

[0047] Referring to FIG. 2, a flowchart for explaining a battery charging method according to an embodiment of the present invention is illustrated.

[0048] The battery charging method according to an embodiment of the present invention includes a method of charging using an external charger of the device and a method of regenerative charging using the regenerative braking of the device. For example, the processor 160 recognizes a preset charger connection signal input from outside the device or a regenerative charging mode during the running of the device, and can distribute the charging. For example, in the case of the regenerative charging mode, a charging current with a higher rate than the standard charging current can be input for a short period of time. In that case, the high-rate charging current can be applied to the charging of the high-output cells capable of high-rate charging.

[0049] In steps S110 and S120, the device according to the present invention can receive a charging current by an external charger or regenerative braking. The processor 160 can obtain a connection signal of an external charger of the device or a regenerative charging mode signal due to deceleration of the device. For example, when the processor 160 obtains a connection signal of an external charger of the device, it can determine the charging mode as the standard charging mode. For example, when the processor 160 obtains a regenerative charging mode signal due to deceleration of the device, it can determine the charging mode as the regenerative charging mode. Also, the processor 160 can measure a charging current on a charging and discharging path connected to the external charger or the motor. For example, the processor 160 can measure a charging current input onto the charging and discharging path from the external charger. For example, the processor 160 can measure a charging current input onto the charging and discharging path from the motor by regenerative braking.

[0050] Also, based on the connection signal of the external charger, the regenerative charging mode signal, and the magnitude of the charging current, the processor 160 can determine a charging cell to be charged among the first cell 110 and the second cell 120, and control the charging of the charging cell.

[0051] In step S130, when the processor 160 obtains a connection signal of an external charger of the device, it can determine the charging mode as the standard charging mode. Also, when the magnitude of the charging current is less than 0.5C, the processor 160 can determine the charging mode as the standard charging mode. In that case, in the standard charging mode, the processor 160 can determine the first cell 110, which is a medium output cell, as the charging cell to be charged, and control the first switch 180 and the second switch 190 so that the first cell 110 can be charged.

[0052] In step S140, when the processor 160 obtains a regenerative charging mode signal due to deceleration of the device, the charging mode can be determined to be the regenerative charging mode. Also, when the magnitude of the charging current is greater than 0.5C and less than 1.33C, the processor 160 can determine the charging mode to be the regenerative charging mode. In that case, in the regenerative charging mode, the processor 160 can determine the second cell 120, which is a high-output cell, as the charging cell to be charged, and can control the first switch 180 and the second switch 190 so that the second cell 120 can be charged.

[0053] In step S150, when the magnitude of the charging current is greater than 1.33C, the processor 160 can determine the charging mode to be the overcharging mode. In that case, the processor 160 can control the first switch 180 and the second switch 190 so that neither the first cell 110 nor the second cell 120 is charged.

[0054] FIG. 3 is a flowchart for explaining a battery charging / discharging method according to another embodiment of the present invention.

[0055] Referring to FIG. 3, a flowchart for explaining a battery discharging method according to an embodiment of the present invention is illustrated.

[0056] In the battery discharging method according to an embodiment of the present invention, during device operation, after measuring the remaining charge states of the high-output cell and the medium-output cell, when the voltage of the high-output cell is higher than that of the medium-output cell, the discharge of the high-output cell can be advanced first. According to the present invention, by regenerative braking, the voltage between the high-output cell, which has been regeneratively charged and has an increased voltage, and the medium-output cell can be made uniform, and the parallel system can be effectively used to maximize the efficiency.

[0057] In step S210, the processor 160 can obtain a running mode signal due to acceleration of the device. Also, based on the running mode signal, the processor 160 can measure the voltages of the first cell 110 and the second cell 120.

[0058] In step S220, the processor 160 can determine the discharge cell with a higher voltage among the first cell 110 and the second cell 120, and control the discharge of the discharge cell. For example, in step S230, when the voltage of the second cell 120, which is a high-output cell, is higher than the voltage of the first cell 110, which is a medium-output cell, the processor 160 determines the second cell 120 as the discharge cell, and can control the first switch 180 and the second switch 190 so that the second cell 120 can be discharged. Alternatively, in step S240, when the voltage of the second cell 120, which is a high-output cell, is not as high as the voltage of the first cell 110, which is a medium-output cell, the processor 160 determines the first cell 110 as the discharge cell, and can control the first switch 180 and the second switch 190 so that the first cell 110 can be discharged.

[0059] FIG. 4 is a flowchart for explaining a battery charge / discharge method according to still another embodiment of the present invention.

[0060] Referring to FIG. 4, a flowchart for explaining a battery charge / discharge method in a standby state of an apparatus according to an embodiment of the present invention is illustrated. For example, a state where the apparatus is not operating can be said to be a standby state.

[0061] In step S310, the processor 160 can obtain a standby mode signal due to the standby state of the apparatus.

[0062] In step S320, the processor 160 can measure the voltages of the first cell 110 and the second cell 120 based on the sleep mode signal. Also, in step S330, when the voltage of the second cell 120 is higher than the voltage of the first cell 110, the processor 160 can discharge the second cell 120 and control the charging of the first cell 110. For example, referring to both FIG. 1 and FIG. 4, when the voltage of the second cell 120, which is a high-output cell, is higher than the voltage of the first cell 110, which is a medium-output cell, the processor 160 can close (turn ON) both the first switch 180 and the second switch 190 to discharge the second cell 120 and charge the first cell 110. Further, in step S340, when the voltage of the second cell 120 is not as high as the voltage of the first cell 110, the processor 160 opens (turns OFF) both the first switch 180 and the second switch 190 so that mutual charging does not occur.

[0063] The various embodiments described above are exemplary and are not necessarily to be distinguished from each other and implemented independently. The embodiments described in this specification can be implemented in a combined form with each other.

[0064] As described above, the various embodiments can be embodied in the form of a computer program that can be executed through various components on a computer, and such a computer program can be recorded on a computer-readable medium. At this time, the medium can continuously store a computer-executable program, or can temporarily store it for execution or download. In addition, the medium can also be various recording means or storage means in a form in which a single or several pieces of hardware are combined, but is not limited to a medium directly connected to a certain computer system, and can also be distributed on a network. Examples of the medium include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROM (compact disc read only memory) and DVD (digital versatile disc); magneto-optical media such as floptical disks; and those including ROM, RAM, flash memory, etc., and configured to store program instruction words. In addition, as examples of other media, there can also be mentioned recording media or storage media managed by an app store that distributes an application, or sites, servers, etc. that supply or distribute various other software.

[0065] In this specification, "section", "module", etc. can also be a hardware component such as a processor or a circuit, and / or a software component executed by a hardware component such as a processor. For example, "section", "module", etc. can be components such as software components, object-oriented software components, class components, and task components; and processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware エ can be embodied by microcodes, circuits, data, databases, data structures, tables, arrays, and variables.

[0066] The foregoing description of the present invention is for illustrative purposes, and those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be easily modified into other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood as illustrative in all aspects and not restrictive. For example, each component described as a single form can be implemented in a distributed manner, and similarly, components described as being distributed can also be implemented in a combined form.

[0067] The scope of the present invention is indicated by the claims rather than the foregoing detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

Description of Reference Numerals

[0068] 100 Battery Pack 101, 102 Pack Terminals 110 First Cell 111, 121 Battery Cells 120 Second Cell 130 Voltage Measurement Unit 140 Current Measurement Unit 150 Temperature Measurement Unit 160 Processor 170 Memory 180 First Switch 190 Second Switch

Claims

1. A device for charging and discharging a battery provided in a device having a motor, A first cell that discharges when the device is running and supplies power to a motor of the device; a second cell that is charged by power supplied from the motor through regenerative braking when the device is decelerating; a first switch provided on a charge / discharge path of the first cell; a second switch provided on a charge / discharge path of the second cell; a processor electrically connected to the first switch and the second switch, for distinguishing the first cell and the second cell when the first cell and the second cell are charged or discharged, and for controlling charging and discharging of the first cell and the second cell.

2. The battery charging / discharging device according to claim 1 , wherein the first cell and the second cell have different battery charging / discharging rates (C-rates).

3. 3. The battery charge / discharge device according to claim 2, wherein a battery charge / discharge rate of the second cell is higher than a battery charge / discharge rate of the first cell.

4. 2. The battery charging / discharging device of claim 1, wherein the processor acquires an external charger connection signal of the device or a regenerative charging mode signal due to deceleration of the device, measures a charging current on a charging / discharging path connected to the external charger or the motor, and determines a charging cell to be charged from the first cell and the second cell based on the external charger connection signal, the regenerative charging mode signal, and a magnitude of the charging current, and controls charging of the charging cell.

5. The battery charging / discharging device according to claim 4 , wherein the processor determines the second cell as the charging cell when the regenerative charging mode signal is acquired, and controls charging of the second cell.

6. 2. The battery charging / discharging device of claim 1, wherein the processor acquires a driving mode signal due to acceleration of the device, measures the voltages of the first cell and the second cell based on the driving mode signal, determines a discharge cell having a higher voltage among the first cell and the second cell, and controls discharging of the discharge cell.

7. 2. The battery charging / discharging device of claim 1, wherein the processor acquires a hibernation mode signal according to a hibernation state of the device, measures the voltages of the first cell and the second cell based on the hibernation mode signal, and, if the voltage of the second cell is higher than the voltage of the first cell, discharges the second cell and controls the charging of the first cell.

8. A method for charging and discharging a battery provided in a device having a motor, comprising: controlling a first switch provided on a charge / discharge path of a first cell that discharges when the device is running and supplies power to a motor of the device, and a second switch provided on a charge / discharge path of a second cell that is charged by receiving power from the motor through regenerative braking when the device is decelerating; distinguishing the first cell from the second cell and controlling charging and discharging of the first cell and the second cell when charging and discharging the first cell and the second cell.

9. 9. The method of claim 8, wherein controlling the charging and discharging of the first cell and the second cell comprises controlling battery charge and discharge rates (C-rates) of the first cell and the second cell to be different from each other.

10. 10. The method of claim 9, wherein controlling the charging and discharging of the first cell and the second cell comprises controlling a battery charge / discharge rate of the second cell to be higher than a battery charge / discharge rate of the first cell.

11. The step of controlling the charge and discharge of the first cell and the second cell includes: receiving a connection signal of an external charger of the device or a regenerative charging mode signal due to deceleration of the device; measuring a charging current on a charging / discharging path connected to the external charger or the motor; 9. The battery charging / discharging method of claim 8, further comprising: determining a charging cell to be charged from among the first cell and the second cell based on the connection signal of the external charger, the regenerative charging mode signal, and the magnitude of the charging current, and controlling charging of the charging cell.

12. 12. The method of claim 11, wherein the step of controlling the charging of the charging cell comprises the step of determining the second cell as the charging cell when the regenerative charging mode signal is acquired, and controlling the charging of the second cell.

13. The step of controlling the charge and discharge of the first cell and the second cell includes: obtaining a driving mode signal according to acceleration of the device; measuring voltages of the first cell and the second cell based on the driving mode signal; 9. The method of claim 8, further comprising: determining a discharge cell having a higher voltage among the first cell and the second cell, and controlling discharge of the discharge cell.

14. The step of controlling the charge and discharge of the first cell and the second cell includes: obtaining a sleep mode signal according to a sleep state of the device; measuring voltages of the first cell and the second cell based on the sleep mode signal; 9. The method of claim 8, further comprising: discharging the second cell and controlling the charging of the first cell when the voltage of the second cell is higher than the voltage of the first cell.

15. A computer program stored on a recording medium for causing a computing device to carry out a method according to any one of claims 8 to 14.

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