Apparatus for calculating integrated state of charge of eco-friendly vehicle equipped with main battery and auxiliary battery, and eco-friendly vehicle including same

Abstract

The present invention relates to an apparatus for calculating an integrated state of charge of an eco-friendly vehicle equipped with a main battery and an auxiliary battery, and an eco-friendly vehicle including the same. An apparatus configured to calculate an integrated state of charge (SOC) of a vehicle equipped with a main battery and an auxiliary battery of an embodiment includes a storage device storing a program executed by the one or more processors, the program including instructions of receiving an SOC of the main battery, receiving an SOC of the auxiliary battery, and calculating a state of charge (SOC) of the vehicle equipped with the main battery and the auxiliary battery. And calculating a comprehensive SOC of the main battery and the auxiliary battery based on the SOC of the main battery and the SOC of the auxiliary battery.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10 - 2023 - 0190109, filed on December 22, 2023, which is hereby incorporated by reference in its entirety. Technical field

[0003] The present invention relates to a device for calculating the integrated state of charge (SOC) of an eco - friendly vehicle equipped with a main battery and an auxiliary battery, and an eco - friendly vehicle including the device. Background art

[0004] An eco - friendly vehicle refers to a vehicle with low carbon and high fuel efficiency, which emits less existing air pollutants and greenhouse gases and has excellent fuel efficiency by using new power sources (such as batteries, fuel cells, etc.) or ultra - high - efficiency new combustion technologies, for example.

[0005] These eco - friendly vehicles can be roughly divided into electric - based vehicles and engine - based vehicles. In particular, electric - based vehicles can be called xEVs. xEVs can include hybrid electric vehicles (HEVs), plug - in hybrid electric vehicles (PHEVs), electric vehicles (EVs), fuel cell electric vehicles (FCEVs), etc.

[0006] xEVs can include a main battery for supplying driving power to a drive motor, and can separately include a main battery management unit for managing the state of charge (SOC) of the main battery.

[0007] Recently, research and development are being carried out on xEVs, which can further include an auxiliary battery and an auxiliary battery management unit for supporting the main battery.

[0008] However, the main battery management unit and the auxiliary battery management unit can operate separately and can independently output the SOC of the main battery and the SOC of the auxiliary battery, but there is no disclosed device for calculating the two in an integrated manner. Summary of the invention

[0009] Embodiments of the present invention provide a device for calculating the integrated state of charge (SOC) of an eco - friendly vehicle equipped with a main battery and an auxiliary battery, and an eco - friendly vehicle including the device, which can be used to calculate the integrated SOC of the main battery and the auxiliary battery in an eco - friendly vehicle equipped with a main battery and an auxiliary battery to provide accurate remaining SOC and driving distance information to a user.

[0010] According to an embodiment of the present invention, an apparatus for calculating the combined state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery includes: at least one processor and a storage medium storing computer-readable instructions, wherein when the computer-readable instructions are executed by the at least one processor, the computer-readable instructions are configured to receive the SOC of the main battery through the at least one processor, receive the SOC of the auxiliary battery, and calculate the combined SOC of the main battery and the auxiliary battery based on the SOC of the main battery and the SOC of the auxiliary battery.

[0011] According to another embodiment of the present invention, an eco-friendly vehicle includes a main battery, an auxiliary battery, a charging and driving unit, and a device, where the charging and driving unit charges the main battery using the power stored in the auxiliary battery or drives an electric motor using the power stored in at least one of the main battery and the auxiliary battery to keep the state of charge (SOC) of the main battery at a minimum SOC; the device is configured to calculate the combined SOC of the main battery and the auxiliary battery based on the SOC of the main battery and the SOC of the auxiliary battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other aspects, features, and advantages of the embodiments of the present invention will be more clearly understood from the following detailed description presented in conjunction with the accompanying drawings, where:

[0013] Figure 1 is a schematic diagram showing an eco-friendly vehicle according to an embodiment of the present invention, the eco-friendly vehicle including a device for calculating the combined state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery.

[0014] Figure 2 is a circuit diagram of an electric motor system according to an embodiment of the present invention.

[0015] Figure 3A and Figure 3B are waveform diagrams of the phase current of the electric motor and the current of the auxiliary battery when the charging mode is executed during driving according to an embodiment of the present invention.

[0016] Figure 4 is a flowchart showing a method for calculating the combined state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery according to an embodiment of the present invention.

[0017] Figure 5 is a block diagram of a computing device that can fully or partially implement an apparatus for calculating the combined state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery. DETAILED DESCRIPTION

[0018] In the following, specific embodiments of the present invention will be described with reference to the accompanying drawings. The following detailed description is provided to assist in a comprehensive understanding of the methods, apparatuses, and / or systems described in this specification. However, the detailed description is for illustrative purposes only, and the present invention is not limited thereto.

[0019] When describing embodiments of the present invention, the detailed description of known technologies related to the present invention may be omitted when it is determined that it may unnecessarily obscure the gist of the present invention. In addition, the terms described below are terms defined in consideration of the functions in the present invention, and may be changed according to the intention or habit of the user or operator. Therefore, the definitions of these terms should be based on the entire content of this specification. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the embodiments. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. As used herein, when used in this specification, the terms "comprising", "including", "having", etc. specify the presence of the described features, values, steps, operations, elements, components, or combinations thereof, but they do not exclude the presence or addition of one or more other features, values, steps, operations, elements, components, and / or groups thereof.

[0020] Figure 1 is a schematic diagram showing an eco-friendly vehicle according to an embodiment of the present invention, and the eco-friendly vehicle includes a device for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery. The eco-friendly vehicle 100 may include a main battery 110, an auxiliary battery 120, a charging and driving unit 130, and a device 140 for calculating the overall state of charge (SOC).

[0021] In an embodiment of the present invention, an eco-friendly vehicle may refer to an electric-based vehicle, and may be an xEV including a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an electric vehicle (EV), a fuel cell electric vehicle (FCEV), etc.

[0022] In addition, the device 140 may include a processor (e.g., a computer, a microprocessor, a CPU, an ASIC, a logic circuit, etc.) and a memory storing software instructions, and the software instructions, when executed by the processor, provide the functions of the control unit 142 described below. In this case, the processor and the memory may be implemented as separate semiconductor circuits. Alternatively, the processor and the memory may be implemented as a single integrated semiconductor circuit. The processor may be provided as at least one processor.

[0023] Specifically, the main battery 110 can be a battery that provides power for driving the motor. The state of charge (SOC) of the main battery 110 can be calculated in real time by the main battery management unit (MBMU) 111 provided in the main battery 110, and the calculated SOC can be sent to the device 140.

[0024] The auxiliary battery 120 can be a battery that charges the main battery 110 or provides power for driving the motor, so that the SOC of the main battery 110 is maintained at the minimum SOC. The SOC of the auxiliary battery 120 can be calculated in real time by the auxiliary battery management unit (ABMU) 121 provided in the auxiliary battery 120, and the calculated SOC can be sent to the device 140.

[0025] The maximum capacity of the auxiliary battery 120 can be less than the maximum capacity of the main battery 110, and the auxiliary battery 120 can be a battery of a different type from the main battery 110.

[0026] In addition, the main battery 110 and the auxiliary battery 120 described above can be high-voltage batteries for driving the motor, can have a rated voltage of 400V to 800V, and can be different from the battery for supplying operating power of 12V to 48V to the electrical loads of the environmental protection vehicle 100.

[0027] The charging and driving unit 130 can charge the main battery 110 using the power stored in the auxiliary battery 120 so that the SOC of the main battery 110 is maintained at the minimum SOC, or the charging and driving unit 130 can drive the motor using the power stored in at least one of the main battery 110 and the auxiliary battery 120. The minimum SOC can be appropriately selected according to the needs of those skilled in the art considering the performance of the main battery 110. It should be noted that the embodiments of the present invention are not limited to a specific value.

[0028] The charging and driving unit 130 can include: an AC / DC converter 131 and a motor system 132. The AC / DC converter 131 is used to charge the main battery 110 and the auxiliary battery 120 using commercial AC power, and the motor system 132 is used to control the motor based on at least one of the main battery 110 and the auxiliary battery 120. In addition, the motor system 132 can increase the voltage of the auxiliary battery 120 during driving to charge the main battery 110, or it can reduce the voltage of the main battery 110 to charge the auxiliary battery 120.

[0029] Hereinafter, the motor system 132 will be described in more detail.

[0030] Figure 2 is a circuit diagram of an electric motor system according to an embodiment of the present invention, Figure 3A and Figure 3B is a waveform diagram of the phase current of the electric motor and the current of the auxiliary battery when the charging mode is executed during driving according to an embodiment of the present invention.

[0031] As Figure 2 shown, the electric motor system 132 may include: a DC capacitor (or DC-link capacitor) 60, a controller 70, and a drive system 1. In addition, the drive system 1 may include: dual inverters 10 and 20, an electric motor 30, and a mode switching unit 40, and the electric motor 30 has a plurality of windings C1, C2, and C3 corresponding to a plurality of phases. Hereinafter, in the first inverter 10 and the second inverter 20, the first drive mode is referred to as a mode of controlling the drive of the electric motor 30 through the first inverter 10 (closed-end winding (CEW)), and the second drive mode is referred to as a mode of controlling the drive of the electric motor 30 through the first inverter 10 and the second inverter 20 (open-end winding (OEW)).

[0032] Hereinafter, an operation method of the controller 70 for controlling the execution of the electric motor drive mode (which includes the CEW mode and the OEW mode) and the execution of the charging mode during driving will be described.

[0033] When the CEW mode is executed, the controller 70 may be controlled to turn on the changeover switches (S31, S32, and S33) to form the neutral point of the electric motor 30 at the internal node N, turn off the charging switches (T1 and T2) to block the boost and charging path of the auxiliary battery 120 connected to the main battery 110 through the drive system 1, and drive the electric motor 30 through the first inverter 10 among the first inverter 10 and the second inverter 20.

[0034] When the OEW mode is executed, the controller 70 may be controlled to turn off the changeover switches (S31, S32, and S33) so as not to form the neutral point of the electric motor 30 at the internal node N, turn off the charging switches (T1 and T2) to block the boost and charging path, and drive the electric motor 30 through the first inverter 10 and the second inverter 20.

[0035] When the CEW mode or the OEW mode is executed, the controller 70 may control space vector pulse width modulation (SVPWM) without performing a direct current (DC) bias on the respective phase currents Iu, Iv, and Iw of the electric motor 30.

[0036] The controller 70 may set the value of the zero-phase current command of the direct current (DC) bias to "0". In this case, the SVPWM control may refer to a method of synthesizing a reference voltage vector by using a zero voltage vector and two effective voltage vectors adjacent to the reference voltage vector in the complex space.

[0037] During driving, the controller 70 may convert the CEW mode to a charging mode based on a predetermined instruction for executing the charging mode.

[0038] When the charging mode is executed during driving, the controller 70 may control to turn on the changeover switches (S31, S32, and S33) to form the neutral point of the motor 30 at the internal node N, turn on the charging switches (T1 and T2) to form a boosting and charging path in which the auxiliary battery 120 is connected to the main battery 110 through the drive system 1, and drive the motor 30 through the first inverter 10 of the first inverter 10 and the second inverter 20.

[0039] In addition, when the charging mode is executed during driving, the controller 70 may apply a direct current (DC) bias to each of the phase currents Iu, Iv, and Iw of the motor 30 having multiple phases based on a charging current instruction for the auxiliary battery 120. More specifically, when the charging mode is executed during driving, the controller 70 may divide the value of the charging current instruction by the number of phases (e.g., 3) to generate a zero-phase current instruction for the direct current (DC) bias, and may output a plurality of switching signals for pulse width modulation control based on the zero-phase current instruction.

[0040] Reference Figure 3A and Figure 3B , shows the phase currents Iu, Iv, and Iw of the motor 30 (see Figure 3A ) and the waveform with respect to the auxiliary battery 120 (see Figure 3B ) when the charging mode is executed during driving.

[0041] As Figure 3A shown, the phase currents Iu, Iv, and Iw of the motor may each have a direct current (DC) bias and may have a 120° phase difference from each other. In addition, as Figure 3B shown, the charging current Ia_bat may be equal to the sum of the phase currents Iu, Iv, and Iw of the motor and may have a direct current waveform obtained by multiplying the direct current (DC) bias by the number of phases (e.g., 3).

[0042] Therefore, when the controller 70 applies a negative direct current (DC) bias to the phase currents Iu, Iv, and Iw of the motor respectively, the charging current Ia_bat may be output from the auxiliary battery 120 to the main battery 110, and the drive system 1 may transmit the power of the auxiliary battery 120 to the main battery 110. On the contrary, when the controller 70 applies a positive direct current (DC) bias to the phase currents Iu, Iv, and Iw of the motor respectively, the charging current Ia_bat may be output from the main battery 110 to the auxiliary battery 120, and the drive system 1 may transmit the power of the main battery 110 to the auxiliary battery 120.

[0043] When the charging mode is executed during driving, the controller 70 may output a plurality of switching signals Su, Sv, and Sw for performing a preset pulse width modulation control on the first inverter 10 to increase the voltage of the auxiliary battery 120 to charge the main battery 110 through the drive system 1, and the controller 70 may control the DC bias of each of the phase currents Iu, Iv, and Iw of the motor. In this case, the plurality of switching signals Su, Sv, and Sw may respectively correspond to the first branch 11, the second branch 12, and the third branch 13. In this embodiment, the preset pulse width modulation control may be set to space vector pulse width modulation (SVPWM) control or remote state pulse width modulation (RSPWM) control. In this case, the RSPWM control may refer to a method of synthesizing a reference voltage vector by using three effective voltage vectors with a phase difference of 120° in the complex space.

[0044] In an embodiment of the present invention, two inverters 10 and 20 are shown, but this is only exemplary. Of course, a single inverter may also be used.

[0045] The device 140 may receive the SOC of the main battery 110, may receive the SOC of the auxiliary battery 120, and then may calculate the integrated SOC of the main battery 110 and the auxiliary battery 120 based on the SOC of the main battery 110 and the SOC of the auxiliary battery 120. The device 140 may operate when the eco-friendly vehicle 100 is parked or stopped.

[0046] The device 140 may include a communication unit 141, a control unit 142, a storage unit 143, and an input / output unit 144.

[0047] Specifically, the communication unit 141 may receive the SOC of the main battery 110 from the main battery management unit 111, may receive the SOC of the auxiliary battery 120 from the auxiliary battery management unit 121, and may send them to the control unit 142.

[0048] The control unit 142 may calculate the integrated SOC (ISOC) of the main battery 110 and the auxiliary battery 120 based on the SOC of the main battery 110 and the SOC of the auxiliary battery 120. In this case, considering the maximum capacity of the main battery 110 and the maximum capacity of the auxiliary battery 120, the integrated SOC may be calculated according to Equation 1 below.

[0049] Equation 1:

[0050] ISOC = (SOC_M × MC_M + SOC_A × MC_A) / (MC_M + MC_A)

[0051] In this case, ISOC is the integrated SOC, SOC_M is the SOC of the main battery, MC_M is the maximum capacity of the main battery, SOC_A is the SOC of the auxiliary battery, and MC_A is the maximum capacity of the auxiliary battery.

[0052] In this case, the SOC of the main battery 110 can be such an SOC that is used to display the conversion of the actual SOC range of the main battery 110 (which includes a preset lower limit and a preset upper limit) into a range corresponding to 0 to 100.

[0053] In addition, the SOC of the auxiliary battery 120 can be such an SOC that is used to display the conversion of the actual SOC range of the auxiliary battery 120 (which includes a preset lower limit and a preset upper limit) into a range corresponding to 0 to 100.

[0054] For example, considering the safety margin of the battery, the actual SOC can be designed to be, for example, 5% to 95%, and it can be converted into a range corresponding to 0 to 100 to be shown to the driver.

[0055] The control unit 142 can perform diagnosis based on the actual SOC of the main battery 110 and the actual SOC of the auxiliary battery 120 during self-diagnosis.

[0056] In addition, when at least one of the SOC of the main battery 110 or the SOC of the auxiliary battery 120 is less than a preset reference value, the control unit 142 can notify the display output limit through the input / output unit 144 described below. The reference value can be a situation where the power is insufficient to drive the motor, and the reference value can be appropriately selected according to the needs of those skilled in the art. Therefore, it should be noted that the embodiments of the present invention are not limited to specific values.

[0057] Finally, the storage unit 143 can store various programs and data to implement the functions executed by the above control unit 142.

[0058] Finally, when at least one of the SOC of the main battery 110 or the SOC of the auxiliary battery 120 is less than a preset reference value under the control of the control unit 142, the input / output unit 144 can notify the display output limit through the input / output unit 144 described below.

[0059] As described above, according to the embodiments of the present invention, the device for calculating the integrated state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery can be used to calculate the integrated SOC of the main battery and the auxiliary battery based on the main SOC of the main battery and the auxiliary SOC of the auxiliary battery, so as to provide accurate remaining SOC and driving distance information to the user.

[0060] Figure 4It is a flowchart showing a method for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery according to an embodiment of the present invention.

[0061] Hereinafter, reference will be made to Figures 1 to 4 a method for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery according to an embodiment of the present invention will be described. However, for the sake of simplicity of the present invention, descriptions that are Figure 1 repeated will be omitted.

[0062] Reference Figures 1 to 4 to, a method (S400) for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery 110 and an auxiliary battery 120 according to an embodiment of the present invention may include receiving the SOC of the main battery 110 and receiving the SOC of the auxiliary battery 120 (step S401 and step S402).

[0063] Hereinafter, a device 140 for calculating the overall SOC may calculate the overall SOC of the main battery 110 and the auxiliary battery 120 based on the SOC of the main battery 110 and the SOC of the auxiliary battery 120 (step S403). In this case, as described above, the maximum capacity of the main battery 110 and the maximum capacity of the auxiliary battery 120 may be considered, and the overall SOC may be calculated according to Equation 1.

[0064] In this case, the SOC of the main battery 110 may be an SOC that is used to show the conversion of the actual SOC range of the main battery 110 (which includes a preset lower limit and a preset upper limit) to a range corresponding to 0 to 100.

[0065] In addition, the SOC of the auxiliary battery 120 may be an SOC that is used to show the conversion of the actual SOC range of the auxiliary battery 120 (which includes a preset lower limit and a preset upper limit) to a range corresponding to 0 to 100.

[0066] As described above, the device 140 may perform diagnosis based on the actual SOC of the main battery 110 and the actual SOC of the auxiliary battery 120 during self-diagnosis.

[0067] Hereinafter, the device 140 may determine whether at least one of the SOC of the main battery 110 or the SOC of the auxiliary battery 120 is less than a preset reference value (step S404).

[0068] As a result determined in step S404, when at least one of the SOC of the main battery 110 or the SOC of the auxiliary battery 120 is less than the preset reference value, the device 140 may display an output limit notification through the input / output unit 144 (step S405).

[0069] As described above, according to an embodiment of the present invention, a device for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery can be used to calculate the overall SOC of the main battery and the auxiliary battery based on the main SOC of the main battery and the auxiliary SOC of the auxiliary battery, so as to provide accurate remaining SOC and driving distance information to the user.

[0070] Figure 5 FIG. 4 is a block diagram of a calculation device according to an embodiment of the present invention, and the calculation device can fully or partially implement a device 140 for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery.

[0071] As Figure 5 shown, the calculation device 500 may include at least one processor 501, a computer-readable storage medium 502, and a communication bus 503.

[0072] The processor 501 may enable the calculation device 500 to operate according to the above-described embodiment. For example, the processor 501 may execute one or more programs 502a stored in the computer-readable storage medium 502. The one or more programs 502a may include one or more computer-executable instructions, which, when executed by the processor 501, cause the calculation device 500 to perform operations according to the embodiment.

[0073] The computer-readable storage medium 502 may be configured to store computer-executable instructions or program code, program data, and / or information in other suitable forms. The program 502a stored in the computer-readable storage medium 502 may include a set of instructions executable by the processor 501. In an embodiment, the computer-readable storage medium 502 may include a memory (such as a volatile memory such as a random access memory, a non-volatile memory, or a suitable combination thereof), at least one disk storage device, at least one optical disk storage device, at least one flash memory device, a storage medium accessible by the calculation device 500 and storing desired information, or a suitable combination thereof.

[0074] The communication bus 503 may interconnect various other components of the calculation device 500 including the processor 501 and the computer-readable storage medium 502.

[0075] The computing device 500 may also include at least one input / output interface 505 and at least one network communication interface 506 to provide an interface for at least one input / output device 504. The input / output interface 505 and the network communication interface 506 may be connected to the communication bus 503. The network may be one of a cellular network (e.g., Global System for Mobile Communications (GSM), Enhanced Data Rates for GSM Evolution (EDGE), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Time Division-CDMA (TD-CDMA), Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE)) or another cellular network.

[0076] The input / output device 504 may be connected to other components of the computing device 500 through the input / output interface 505. Exemplary input / output devices 504 may include, but are not limited to, input devices such as pointing devices (e.g., mouse, touchpad, etc.), keyboards, touch input devices (e.g., touchpad, touch screen, etc.), voice or sound input devices, various types of sensor devices, and / or various types of imaging devices, and / or output devices such as display devices, printers, speakers, and / or network cards. The exemplary input / output device 504 may be included in the computing device 500 as a component constituting the computing device 500, or it may be connected to the computing device 500 as a separate device separate from the computing device 500.

[0077] Embodiments of the present invention may include a program for executing the methods described in this specification on a computer and a computer-readable recording medium containing the program. The computer-readable recording medium may include program instructions, local data files, local data structures, etc., either individually or in combination. The medium may be a medium specifically designed and constructed for the present invention, or the medium may be a medium commonly available in the field of computer software. Examples of the computer-readable recording medium may include magnetic media such as hard disks, floppy disks, or magnetic tapes, optical recording media such as CD-ROMs or DVDs, and hardware devices specifically configured to store and execute program instructions such as ROMs, RAMs, flash memories, etc. Examples of the program may include not only machine language code generated by a compiler but also high-level language code executable by a computer using an interpreter, etc.

[0078] According to an embodiment of the present invention, in a device for calculating the overall state of charge (SOC) of an eco-friendly vehicle equipped with a main battery and an auxiliary battery, the overall SOC of the main battery and the auxiliary battery in the eco-friendly vehicle equipped with the main battery and the auxiliary battery may be calculated to provide accurate remaining SOC and driving distance information to the user.

[0079] Although the exemplary embodiments have been shown and described above, it will be apparent to those of ordinary skill in the art that modifications and variations can be made without departing from the scope of the invention as defined by the appended claims.

Claims

1. A device for calculating the comprehensive state of charge of a vehicle equipped with a main battery and an auxiliary battery, the device comprising: one or more processors; and A storage device storing a program executed by the one or more processors, the program Includes the following instructions: Receive the power status of the main battery; Receive the power status of the auxiliary battery; as well as A combined state of charge of the main battery and the auxiliary battery is calculated based on the state of charge of the main battery and the state of charge of the auxiliary battery.

2. The device according to claim 1, wherein: The main battery is configured to: supply power to drive a drive motor of the vehicle; The auxiliary battery is configured to supply power to charge the main battery so that the state of charge of the main battery is maintained at a minimum state of charge, or to drive the drive motor.

3. The device according to claim 1, wherein: The maximum capacity of the auxiliary battery is smaller than the maximum capacity of the main battery.

4. The device according to claim 1, wherein: The auxiliary battery is a different type of battery than the main battery.

5. The device according to claim 1, wherein: The program further includes instructions for calculating a combined state of charge of the main battery and the auxiliary battery taking into account a maximum capacity of the main battery and a maximum capacity of the auxiliary battery.

6. The device according to claim 5, wherein: The program further includes instructions for calculating the integrated state of charge according to the following equation: ISOC = (SOC_M×MC_M+SOC_A×MC_A) / (MC_M+MC_A), where ISOC is the comprehensive state of charge, SOC_M is the state of charge of the main battery, MC_M is the maximum capacity of the main battery, SOC_A is the state of charge of the auxiliary battery, and MC_A is the maximum capacity of the auxiliary battery.

7. The device according to claim 1, wherein: The power state of the main battery is used to display the conversion of the actual power state range of the main battery including a preset lower limit and a preset upper limit into a power state corresponding to a range of 0 to 100; The power state of the auxiliary battery is used to display the actual power state range of the auxiliary battery including a preset lower limit and a preset upper limit converted into a power state corresponding to a range of 0 to 100.

8. The device according to claim 1, wherein: The program further includes instructions for displaying an output limit notification in response to a state of charge of the main battery or a state of charge of the auxiliary battery being less than a preset reference value.

9. The device according to claim 1, wherein: The device is configured to perform a self-diagnosis based on an actual state of charge of the main battery and an actual state of charge of the auxiliary battery.

10. The device according to claim 1, wherein: The program further includes instructions for calculating a comprehensive state of charge when the vehicle is parked or stopped.

11. A vehicle comprising: Main battery; Auxiliary battery; a charging and driving unit configured to charge the main battery using the power stored in the auxiliary battery to maintain the state of charge of the main battery at a minimum state of charge, or to drive the motor using the power stored in the main battery or the auxiliary battery; as well as A device is configured to calculate a combined state of charge of a main battery and an auxiliary battery based on the state of charge of the main battery and the state of charge of the auxiliary battery.

12. The vehicle according to claim 11, wherein: The maximum capacity of the auxiliary battery is smaller than the maximum capacity of the main battery.

13. The vehicle according to claim 11, wherein: The auxiliary battery is a different type of battery than the main battery.

14. The vehicle of claim 11, wherein: The device is configured to calculate a comprehensive state of charge of the main battery and the auxiliary battery by taking into account a maximum capacity of the main battery and a maximum capacity of the auxiliary battery.

15. The vehicle of claim 14, wherein: The device is configured to calculate the comprehensive power state according to the following equation: ISOC = (SOC_M×MC_M+SOC_A×MC_A) / (MC_M+MC_A), where ISOC is the comprehensive state of charge, SOC_M is the state of charge of the main battery, MC_M is the maximum capacity of the main battery, SOC_A is the state of charge of the auxiliary battery, and MC_A is the maximum capacity of the auxiliary battery.

16. The vehicle of claim 11, wherein: The power state of the main battery is used to display the conversion of the actual power state range of the main battery including a preset lower limit and a preset upper limit into a power state corresponding to a range of 0 to 100; The power state of the auxiliary battery is used to display the actual power state range of the auxiliary battery including a preset lower limit and a preset upper limit converted into a power state corresponding to a range of 0 to 100.

17. The vehicle of claim 11, wherein: The device is configured to display an output limit notification in response to a state of charge of a main battery or a state of charge of an auxiliary battery being less than a preset reference value.

18. The vehicle of claim 11, wherein: The vehicle is configured to perform a self-diagnosis based on an actual state of charge of a main battery and an actual state of charge of an auxiliary battery.

19. The vehicle of claim 11, wherein: The device is configured to calculate the comprehensive power state when the vehicle is parked or stopped.

20. The vehicle of claim 11, wherein: The charging and driving unit comprises: A motor system comprising the motor and an inverter; and An AC / DC converter is configured to charge the main battery and the auxiliary battery using commercial power.

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