Electric vehicle and control method thereof

Abstract

The invention relates to an electric vehicle and a control method thereof. The electric vehicle includes a first battery and a second battery, a power conversion device connected between the first battery and the second battery, and a controller. The controller determines a charging current command value of the first battery and a charging current command value of the second battery according to an external charging current value based on a charging limit current of the first battery, a charging limit current of the second battery, and a charging current distribution ratio determined by an SOC value of the first battery and an SOC value of the second battery. And control the power conversion device according to the charging current command value to distribute the external charging current to the first battery and the second battery.

Description

Technical Field

[0001] The present invention relates to an electric vehicle and a method of controlling the electric vehicle, the electric vehicle being configured to control charging of a main battery and an auxiliary battery. Background Art

[0002] An electric vehicle may be provided with a main battery and an auxiliary battery, wherein the main battery is provided as a primary energy source for motor drive and the auxiliary battery is provided as a power source for electrical loads or a supplementary energy source for motor drive.

[0003] During fast charging, the main battery and auxiliary battery can be charged simultaneously via an external DC voltage. The controller that controls their charging can take into account the state of charge (SOC) and durability of each battery to minimize the time required to fully charge the batteries.

[0004] The information included in this Background of the Invention section is only intended to enhance understanding of the overall background of the invention and should not be taken as an acknowledgment or any form of suggestion that this information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The present invention aims to solve the technical problem of balancing battery durability and optimizing the time it takes to fully charge batteries by setting the charge amount of each battery based on the SOC value and charging limit of each battery in an electric vehicle provided with a main battery and an auxiliary battery.

[0006] The technical objectives that the present invention aims to achieve are not limited to the above-mentioned technical objectives, and those skilled in the art will clearly understand other technical objectives not mentioned through the following description.

[0007] Various aspects of the present invention are intended to provide an electric vehicle, the electric vehicle comprising a first battery and a second battery, a power conversion device and a controller, the power conversion device being connected between the first battery and the second battery, the controller calculating a charging current command value of the first battery and a charging current command value of the second battery according to an external charging current value based on a charging limit current of the first battery and a charging limit current of the second battery and a charging current distribution ratio determined by an SOC value of the first battery and the SOC value of the second battery, and being configured to control the power conversion device to distribute the external charging current to the first battery and the second battery according to the charging current command values.

[0008] In one example, the controller may determine the remaining charge capacity of the first battery based on the SOC value of the first battery, calculate the remaining charge capacity of the second battery based on the SOC value of the second battery, and set the ratio of the remaining charge capacity of the first battery to the remaining charge capacity of the second battery as the charging current distribution ratio.

[0009] In one example, the controller may distribute the external charging current value according to the charging current distribution ratio to calculate the charging current distribution value of the first battery and the charging current distribution value of the second battery, and compare the charging current distribution value with the charging limit current value to set the charging current command value based on the comparison result.

[0010] In one example, when the charging current distribution value of the first battery is less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery is less than or equal to the charging limit current value of the second battery, the controller may set the charging current distribution value of the first battery to the charging current command value of the first battery, and set the charging current distribution value of the second battery to the charging current command value of the second battery.

[0011] In one example, when the charging current distribution value of the first battery exceeds the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeds the charging limit current value of the second battery, the controller may set the charging limit current value of the first battery as the charging current command value of the first battery, and set the charging limit current value of the second battery as the charging current command value of the second battery.

[0012] In one example, when the charging current distribution value of the first battery exceeds the charging limit current value of the first battery, and the charging current distribution value of the second battery is less than or equal to the charging limit current value of the second battery, the controller may set the charging limit current value of the first battery as the charging current command value of the first battery, and set the smaller value of the sum of the charging limit current value of the second battery, the charging current distribution value of the second battery, and the remaining current distribution value of the first battery as the charging current command value of the second battery. The remaining current distribution value of the first battery may correspond to the difference between the charging current distribution value of the first battery and the charging limit current value.

[0013] In one example, when the charging current distribution value of the first battery is less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeds the charging limit current value of the second battery, the controller may set the charging limit current value of the second battery as the charging current command value of the second battery, and set the smaller value of the sum of the charging limit current value of the first battery, the charging current distribution value of the first battery, and the remaining current distribution value of the second battery as the charging current command value of the first battery. The remaining current distribution value of the second battery may correspond to the difference between the charging current distribution value of the second battery and the charging limit current value.

[0014] In one example, when at least any one of the charge limit current value or the SOC changes, the controller may re-determine the charge current command value.

[0015] In addition, as a means to solve the above-mentioned technical problems, a method for controlling an electric vehicle may include: determining a charging current distribution ratio determined by the SOC value of a first battery and the SOC of a second battery, calculating a charging current command value of the first battery and a charging current command value of the second battery according to an external charging current value based on the charging limit currents of the first battery and the second battery and the charging current distribution ratio, and controlling a power conversion device connected between the first battery and the second battery to distribute the external charging current to the first battery and the second battery according to the charging current command value.

[0016] In one example, determining the charging current distribution ratio may include: calculating the remaining charging capacity of the first battery based on the SOC value of the first battery, calculating the remaining charging capacity of the second battery based on the SOC value of the second battery, and setting the ratio of the remaining charging capacity of the first battery to the remaining charging capacity of the second battery as the charging current distribution ratio.

[0017] In one example, calculating the charging current command value may include: allocating an external charging current value according to a charging current distribution ratio to calculate a charging current distribution value for a first battery and a charging current distribution value for a second battery, and comparing the charging current distribution value with a charging limit current value to set the charging current command value based on a result of the comparison.

[0018] In one example, when the charging current distribution value of the first battery is less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery is less than or equal to the charging limit current value of the second battery, the setting of the charging current command value can be performed to set the charging current distribution value of the first battery to the charging current command value of the first battery, and to set the charging current distribution value of the second battery to the charging current command value of the second battery.

[0019] In one example, when the charging current distribution value of the first battery exceeds the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeds the charging limit current value of the second battery, the setting of the charging current command value can be performed to set the charging limit current value of the first battery to the charging current command value of the first battery, and to set the charging limit current value of the second battery to the charging current command value of the second battery.

[0020] In one example, when the charging current distribution value of the first battery exceeds the charging limit current value of the first battery, and the charging current distribution value of the second battery is less than or equal to the charging limit current value of the second battery, the setting of the charging current command value may be performed to set the charging limit current value of the first battery as the charging current command value of the first battery, and set the smaller value of the sum of the charging limit current value of the second battery, the charging current distribution value of the second battery, and the remaining current distribution value of the first battery as the charging current command value of the second battery. The remaining current distribution value of the first battery may correspond to the difference between the charging current distribution value of the first battery and the charging limit current value.

[0021] In one example, when the charging current distribution value of the first battery is less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeds the charging limit current value of the second battery, the setting of the charging current command value may be performed to set the charging limit current value of the second battery as the charging current command value of the second battery, and set the smaller value of the sum of the charging limit current value of the first battery, the charging current distribution value of the first battery, and the remaining current distribution value of the second battery as the charging current command value of the first battery. The remaining current distribution value of the second battery may correspond to the difference between the charging current distribution value of the second battery and the charging limit current value.

[0022] In one example, the method of controlling an electric vehicle may further include: when at least any one of a charging limit current value or an SOC value changes, re-determining a charging current command value.

[0023] According to an exemplary embodiment of the present invention, by setting the charge amount of each battery based on the SOC value and the charge limit value of each battery in an electric vehicle provided with a main battery and an auxiliary battery, the durability of the batteries can be balanced and the time to fully charge the batteries can be optimized.

[0024] Effects obtainable from the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood from the following description by those skilled in the art.

[0025] The methods and apparatus of the present invention have other features and advantages that will be apparent from, or will be described in more detail in, the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a block diagram showing a configuration of an electric vehicle according to an exemplary embodiment of the present invention.

[0027] Figure 2is a schematic diagram for describing a power transmission flow of an electric vehicle in a traveling state according to an exemplary embodiment of the present invention.

[0028] Figure 3 is a schematic diagram for describing a power transfer process of an electric vehicle in a charging state according to an exemplary embodiment of the present invention.

[0029] Figure 4 is a block diagram showing a configuration of a control system of an electric vehicle according to an exemplary embodiment of the present invention.

[0030] Figure 5 is a flowchart for describing a method of controlling an electric vehicle according to an exemplary embodiment of the present invention.

[0031] Figure 6 is a flowchart for describing a process of setting a charging current command for an electric vehicle according to an exemplary embodiment of the present invention.

[0032] It can be understood that the accompanying drawings are not necessarily drawn to scale, but are schematically simplified to present various features to show the basic principles of the present invention. The predetermined design features of the present invention included herein (including, for example, specific dimensions, directions, positions and shapes) will be determined in part by the specific environment to be applied and used.

[0033] In the drawings, like reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0034] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments of the present invention, it will be understood that this specification is not intended to limit the present invention to those exemplary embodiments of the present invention. On the other hand, the present invention is intended to cover not only the exemplary embodiments of the present invention, but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0035] Exemplary embodiments included herein will be described in detail below with reference to the accompanying drawings. However, the same or similar components will be provided with the same reference numerals regardless of the figure numbers, and repeated descriptions about these components will be omitted.

[0036] When it is determined that the detailed description of related and known technologies may obscure the essence of the exemplary embodiments included herein, the detailed description will be omitted. In addition, it should be understood that the drawings are only intended to facilitate the understanding of the exemplary embodiments included herein, are not intended to limit the technical ideas included herein, are not limited to the drawings, and include all modifications, equivalents or alternative forms within the spirit and technical scope of the present invention.

[0037] In the following description of the embodiments, the term "preset" means that the value of the parameter is predetermined when the parameter is used in a process or algorithm. Depending on the embodiment, the value of the parameter can be set at the beginning of the process or algorithm, or can be set when the process or algorithm is executed.

[0038] Terms including ordinal numbers such as first, second, etc. may be used to describe various components, but the components are not limited by these terms. These terms may be used only to distinguish one component from another.

[0039] It should be understood that when a component is referred to as being "connected" or "coupled" to another component, the component may be directly connected or coupled to the other component, but other components may be interposed therebetween. Conversely, it should be understood that when a component is referred to as being "directly connected" or "directly coupled" to another component, no other components are interposed.

[0040] A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0041] In the present specification, terms such as “include” or “have” are intended to indicate the presence of features, quantities, steps, operations, components, parts, or a combination thereof of the implementations described in the specification, and should not be understood as excluding the presence and additional possibilities of one or more other features, quantities, steps, operations, components, parts, or a combination thereof.

[0042] The controller may include a communication device, a memory, and one or more processors. The communication device communicates with other controllers or sensors to control the functions that the controller is responsible for, the memory stores operating system or logic instructions and input and output information, and the one or more processors perform determinations, calculations, decisions, etc. required to control the functions that the controller is responsible for.

[0043] The present invention proposes an electric vehicle provided with a main battery and an auxiliary battery and configured to set the charge amount of each battery by considering the SOC value and the charge limit of each battery, thereby balancing the durability of the batteries and optimizing the time for fully charging the batteries.

[0044] Figure 1 is a block diagram showing a configuration of an electric vehicle according to an exemplary embodiment of the present invention.

[0045] Figure 1 It is shown that an electric vehicle according to an exemplary embodiment of the present invention may include a charging port 10, a main battery 20, an auxiliary battery 30, a power conversion device 40, a motor drive device 50, and a controller 100. At this time, the controller 100 may be implemented as a vehicle control unit (VCU), but is not limited thereto.

[0046] The charging port 10 corresponds to a port to be fixed to an external charging device such as electric vehicle supply equipment (EVSE), and may receive an external charging current from the external charging device and transmit the current to the main battery 20 .

[0047] The main battery 20 and the auxiliary battery 30 may be used as a power source for an electrical load, or may be used as an energy source for transmitting electric power to the motor drive device 50 .

[0048] The power conversion device 40 is connected between the main battery 20 and the auxiliary battery 30, and converts a voltage for power control between the main battery 20 and the auxiliary battery 30. The power conversion device 40 may include a bidirectional DC-DC converter.

[0049] The motor driving device 50 may drive the motor based on the mechanical energy converted by the power conversion device 40 .

[0050] The controller 100 may be configured to control the power conversion device 40 to distribute the external charging current to the main battery 20 and the auxiliary battery 30 according to the charging current instruction value.

[0051] First, the controller 100 may be configured to determine the charging current command value of the main battery 20 and the charging current command value of the auxiliary battery 30 according to the external charging current value, respectively, based on the charging limit current of the main battery 20 and the charging limit current of the auxiliary battery 30 and the charging current distribution ratio determined by the SOC value of the main battery 20 and the SOC value of the auxiliary battery 30. Here, the external charging current value may be measured by a current sensor provided between the charging port 10 and the main battery 20.

[0052] The charge limit current value of the main battery 20 may correspond to the upper limit of the charge current command value of the main battery 20, and the charge limit current value of the auxiliary battery 30 may correspond to the upper limit of the charge current command value of the auxiliary battery 30. The charge limit current value of the main battery 20 and the charge limit current value of the auxiliary battery 30 may be changed according to the temperature and SOC value of the main battery 20 and the auxiliary battery 30.

[0053] The charging current distribution ratio may be changed according to the SOC value of the main battery 20 and the SOC value of the auxiliary battery 30. The controller 100 may be configured to determine the remaining charging capacity of the main battery 20 based on the SOC value of the main battery 20, determine the remaining charging capacity of the auxiliary battery 30 based on the SOC value of the auxiliary battery 30, and set the ratio of the remaining charging capacity of the main battery 20 to the remaining charging capacity of the auxiliary battery 30 as the charging current distribution ratio. For example, when the remaining charging capacity of the main battery 20 corresponds to 40Ah and the remaining charging capacity of the auxiliary battery 30 corresponds to 10Ah, the charging current distribution ratio may be 4:1. Another example is that when the remaining charging capacity of the main battery 20 corresponds to 30Ah and the remaining charging capacity of the auxiliary battery 30 corresponds to 20Ah, the charging current distribution ratio is 3:2.

[0054] The controller 100 may distribute the value of the external charging current according to the charging current distribution ratio to respectively determine the charging current distribution value of the main battery 20 and the charging current distribution value of the auxiliary battery 30. For example, when the external charging current value corresponds to 300A and the charging current distribution ratio corresponds to 4:1, the charging current distribution value of the main battery 20 may correspond to 240A, and the charging current distribution value of the auxiliary battery 30 may correspond to 60A. In another example, when the external charging current value corresponds to 200A and the charging current distribution ratio corresponds to 3:2, the charging current distribution value of the main battery 20 may correspond to 120A, and the charging current distribution value of the auxiliary battery 30 may correspond to 80A.

[0055] Thereafter, the controller 100 may compare the charging current distribution value with the charging limit current value and set the charging current instruction value based on the comparison result.

[0056] When the charging current distribution value of the main battery 20 and the charging current distribution value of the auxiliary battery 30 are both less than or equal to the charging limit current, the charging current command value may be set equal to the charging current distribution value. When the charging current distribution value of the main battery 20 is less than or equal to the charging limit current value of the main battery 20, and the charging current distribution value of the auxiliary battery 30 is less than or equal to the charging limit current value of the auxiliary battery 30, the controller 100 may set the charging current distribution value of the main battery 20 to the charging current command value of the main battery 20, and may set the charging current distribution value of the auxiliary battery 30 to the charging current command value of the auxiliary battery 30.

[0057] When both the charging current distribution value of the main battery 20 and the charging current distribution value of the auxiliary battery 30 exceed the charging limit current value, the charging current command value may be set equal to the charging limit current value. When the charging current distribution value of the main battery 20 exceeds the charging limit current value of the main battery 20, and the charging current distribution value of the auxiliary battery 30 exceeds the charging limit current value of the auxiliary battery 30, the controller 100 may set the charging limit current value of the main battery 20 as the charging current command value of the main battery 20, and may set the charging limit current value of the auxiliary battery 30 as the charging current command value of the auxiliary battery 30.

[0058] When any one of the charging current distribution value of the main battery 20 and the charging current distribution value of the auxiliary battery 30 exceeds the charging limit current value, the controller 100 may readjust the charging current distribution value and set the charging current command value. When the charging current distribution value of the main battery 20 exceeds the charging limit current value of the main battery 20, and the charging current distribution value of the auxiliary battery 30 is less than or equal to the charging limit current value of the auxiliary battery 30, the controller 100 may set the charging limit current value of the main battery 20 as the charging current command value of the main battery 20, and may set the smaller value of the sum of the charging limit current value of the auxiliary battery 30, the charging current distribution value of the auxiliary battery 30, and the remaining current distribution value of the main battery 20 (i.e., the difference between the charging current distribution value of the main battery and the charging limit current value) as the charging current command value of the auxiliary battery 30. On the contrary, when the charging current distribution value of the main battery 20 is less than or equal to the charging limit current value of the main battery 20, and the charging current distribution value of the auxiliary battery 30 exceeds the charging limit current value of the auxiliary battery 30, the controller 100 can set the charging limit current value of the auxiliary battery 30 as the charging current command value of the auxiliary battery 30, and can set the smaller value of the sum of the charging limit current value of the main battery 20, the charging current distribution value of the main battery 20 and the remaining current distribution value of the auxiliary battery 30 (that is, the difference between the charging current distribution value of the auxiliary battery and the charging limit current value) as the charging current command value of the main battery 20.

[0059] On the other hand, when at least one of the charging limit current value of the main battery 20 and the charging limit current value of the auxiliary battery 30 or the SOC value of the main battery 20 and the SOC value of the auxiliary battery 30 changes, the controller 100 can re-determine the charging current command value of the main battery 20 and the charging current command value of the auxiliary battery 30.

[0060] Figure 2 and Figure 3 is a schematic diagram for describing a power transfer process of an electric vehicle according to an exemplary embodiment of the present invention.

[0061] Figure 21 shows a power transmission process of an electric vehicle in a driving state according to an exemplary embodiment of the present invention. In this case, the power conversion device 40 can discharge the main battery 20 to supply power to the motor drive device 50 driving the motor, and discharge the auxiliary battery 30 to charge the main battery 20.

[0062] Figure 3 1 is a diagram showing a power transfer process of an electric vehicle in a charging state according to an exemplary embodiment of the present invention. In this case, the main battery 20 can be charged by an external charging current supplied through the charging port 10, and the auxiliary battery 30 can be charged by the power conversion device 40 that converts the voltage of the main battery 20.

[0063] Figure 4 is a block diagram showing a configuration of a control system of an electric vehicle according to an exemplary embodiment of the present invention.

[0064] Figure 4 The control system configuration of the electric vehicle according to the exemplary embodiment of the present invention is shown to include a controller 100, a first battery management unit (BMU) 200 (which monitors and controls the state of the main battery 20), and a second battery management unit (BMU) 300 (which monitors and controls the state of the auxiliary battery 30). The first BMU 200 may send the temperature and SOC information of the main battery 20 and the charging and discharging signals related to the main battery 20 to the controller 100, and receive the parking and stopping state information of the electric vehicle from the controller 100. At this time, the controller 100 may send the temperature and SOC information of the main battery 20 received from the first BMU 200 to the second BMU 300. The second BMU 300 may send the temperature and SOC information of the auxiliary battery 30 and the charging and discharging signals related to the auxiliary battery 30 to the controller 100, and receive the parking and stopping state information of the electric vehicle from the controller 100.

[0065] Figure 5 is a flowchart for describing a method of controlling an electric vehicle according to an exemplary embodiment of the present invention.

[0066] Figure 5 It is shown that the controller 100 can monitor the SOC values ​​of the main battery 20 and the auxiliary battery 30 (S101), and determine the remaining charge capacity of the main battery 20 and the auxiliary battery 30 based on the SOC values ​​(S102). At this time, the charging current distribution ratio can be set to the remaining charge capacity ratio of the main battery 20 and the auxiliary battery 30. The controller 100 can obtain the SOC value of the main battery 20 and the SOC value of the auxiliary battery 30 from a corresponding battery management unit (BMU) or a battery management system (BMS) provided in each of the first battery 20 and the second battery 30.

[0067] The controller 100 may be configured to determine the charging current command value of the main battery 20 and the charging current command value of the auxiliary battery 30 according to the external charging current value based on the charging limit current and the charging current distribution ratio of the main battery 20 and the auxiliary battery 30 (S103, S104). The controller 100 may distribute the external charging current value according to the charging current distribution ratio to determine the charging current distribution value of the main battery 20 and the charging current distribution value of the auxiliary battery 30 respectively (S103), and may compare the charging current distribution value with the charging limit current value to set the charging current command value based on the comparison result (S104). Figure 6 The setting of the charging current command value is described in detail.

[0068] Thereafter, the controller 100 may be configured to control the power conversion device 40 connected between the main battery 20 and the auxiliary battery 30 to distribute the external charging current to the main battery 20 and the auxiliary battery 30 according to the charging current instruction value ( S105 ).

[0069] When at least one of the charging limit current value of the main battery 20 and the charging limit current value of the auxiliary battery 30 or the SOC value of the main battery 20 and the SOC value of the auxiliary battery 30 changes (yes in S106), the controller 100 can repeat S101 to S105 to redetermine the charging current command value of the main battery 20 and the charging current command value of the auxiliary battery 30.

[0070] When no change occurs (No in S106 ), the controller 100 may be configured to determine whether to terminate charging ( S107 ).

[0071] Figure 6 is a flowchart for describing a process of setting a charging current command for an electric vehicle according to an exemplary embodiment of the present invention. For convenience, it is assumed that the first battery is the main battery 20 , and the second battery is assumed to be the auxiliary battery 30 .

[0072] As mentioned above Figure 5 As described, the controller 100 can distribute the external charging current value according to the charging current distribution ratio to respectively determine the charging current distribution value of the main battery 20 and the charging current distribution value of the auxiliary battery 30 (S103), and compare the charging current distribution value with the charging limit current value to set the charging current command value based on the comparison result (S104).

[0073] Reference below Figure 6Step S104 is described in more detail. When the charging current distribution value of the first battery exceeds the charging limit current value of the first battery (Yes in S210), and the charging current distribution value of the second battery is less than or equal to the charging limit current value of the second battery (Yes in S220A), the controller 100 can set the charging limit current value of the first battery as the charging current command value of the first battery, and can set the smaller value of the sum of the charging limit current value of the second battery, the charging current distribution value of the second battery, and the remaining current distribution value of the first battery (i.e., the difference between the charging current distribution value of the first battery and the charging limit current value) as the charging current command value of the auxiliary battery 30 (S230B).

[0074] On the contrary, when the charging current distribution value of the first battery is less than or equal to the charging limit current value of the first battery (No in S210), and the charging current distribution value of the second battery exceeds the charging limit current value of the second battery (Yes in S220B), the controller 100 can set the charging limit current value of the second battery as the charging current command value of the second battery, and set the smaller value of the sum of the charging limit current value of the first battery, the charging current distribution value of the first battery and the remaining current distribution value of the second battery (i.e., the difference between the charging current distribution value of the second battery and the charging limit current value) as the charging current command value of the first battery 20 (S230D).

[0075] In addition, when the charging current distribution value of the first battery exceeds the charging limit current value of the first battery (Yes in S210), and the charging current distribution value of the second battery exceeds the charging limit current value of the second battery (No in S220A), the controller 100 can set the charging current instruction of each battery to the charging limit current of each battery (S230A).

[0076] On the other hand, when the charging current distribution value of the first battery is less than or equal to the charging limit current value of the first battery (No in S210), and the charging current distribution value of the second battery is less than or equal to the charging limit current value of the second battery (No in S220B), the controller 100 may set the charging current instruction of each battery to the charging current distribution of each battery (S230C).

[0077] On the other hand, the present invention can be implemented as a computer-readable code on a medium of a recording program. Computer-readable media include all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media are hard disk drives (HDDs), solid-state disks (SSDs), silicon disk drives (SDDs), ROMs, RAMs, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, etc. Therefore, the above detailed description should not be interpreted as a limiting test, but should be regarded as illustrative. The scope of the present invention will be determined by a reasonable interpretation of the attached claims, and all modifications within the equivalent scope of the present invention will be included within the scope of the present invention.

[0078] In addition, terms related to the control device, such as "controller", "control device", "control unit", "control device", "control module" or "server", etc., refer to a hardware device including a memory and a processor, which is configured to execute one or more steps interpreted as an algorithm structure. The memory stores the algorithm steps, and the processor executes the algorithm steps to perform one or more processes of the method according to each exemplary embodiment of the present invention. The control device according to the exemplary embodiment of the present invention can be implemented by a non-volatile memory and a processor, the non-volatile memory is configured to store an algorithm for controlling the operation of various components of the vehicle or data about software instructions for executing the algorithm, and the processor is configured to use the data stored in the memory to perform the operations as described above. The memory and the processor may be separate chips. Alternatively, the memory and the processor may be integrated in a single chip. The processor may be implemented as one or more processors. The processor may include various logic circuits and operating circuits, may be configured to process data according to a program provided from the memory, and may be configured to generate a control signal according to the processing result.

[0079] The control device may be at least one microprocessor operated by a predetermined program, and the predetermined program may include a series of instructions for executing the methods included in the aforementioned various exemplary embodiments of the present invention.

[0080] The above invention can also be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium is any data storage device that can store data that can be subsequently read by a computer system and store and execute program instructions that can subsequently be read by a computer system. Examples of computer-readable recording media include hard disk drives (HDDs), solid-state disks (SSDs), silicon disk drives (SDDs), read-only memories (ROMs), random access memories (RAMs), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like, as well as implementations as carrier waves (e.g., transmissions over the Internet). Examples of program instructions include machine language codes such as those generated by a compiler, and high-level language codes that can be executed by a computer using an interpreter, etc.

[0081] In various exemplary embodiments of the present invention, each of the above-described operations may be performed by a control device, and the control device may be configured by a plurality of control devices or an integrated single control device.

[0082] In various exemplary embodiments of the present invention, the memory and the processor may be provided as one chip, or provided as separate chips.

[0083] In various exemplary embodiments of the present invention, the scope of the present invention includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) for enabling the operations of methods according to various embodiments to be performed on a device or computer, and the scope of the present invention includes non-transitory computer-readable media including such software or instructions stored on and executable on a device or computer.

[0084] In various exemplary embodiments of the present invention, the control device may be implemented in the form of hardware or software, or may be implemented in a combination of hardware and software.

[0085] Furthermore, terms such as “unit”, “module” and the like included in the specification mean a unit for performing at least one function or operation and may be implemented by hardware, software or a combination thereof.

[0086] For convenience of explanation and precise definition of the appended claims, the terms "upper", "lower", "inner", "outer", "above", "below", "upward", "downward", "front", "rear", "back", "inside", "outside", "inwardly", "outwardly", "inner", "external", "inside", "outside", "forward" and "rearward" are used to describe the features of the exemplary embodiments with reference to the positions of such features as shown in the accompanying drawings. It will be further understood that the term "connect" or its derivatives refer to both direct and indirect connections.

[0087] The term "and / or" may include a combination of multiple related listed items or any one of the multiple related listed items. For example, "A and / or B" includes all three situations, such as "A", "B" and "A and B".

[0088] In this specification, unless otherwise stated, a singular expression includes a plural expression unless the context clearly indicates otherwise.

[0089] In an exemplary embodiment of the present invention, “at least one of A and B” may refer to “at least one of A or B” or “at least one of a combination of at least one of A and B”. Furthermore, “one or more of A and B” may refer to “one or more of A or B” or “one or more of a combination of one or more of A and B”.

[0090] In the exemplary embodiments of the present invention, it should be understood that terms such as “including” or “having” are intended to indicate the presence of features, quantities, steps, operations, elements, parts, or a combination thereof described in the specification, and do not exclude the possibility of adding or existing one or more other features, quantities, steps, operations, elements, parts, or a combination thereof.

[0091] The foregoing descriptions of the specific exemplary embodiments of the present invention are presented for the purpose of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise form disclosed, and it is apparent that many modifications and changes may be made in accordance with the above teachings. Exemplary embodiments are selected and described to explain the specific principles of the present invention and their practical applications, so that other persons skilled in the art can implement and utilize various exemplary embodiments of the present invention and their different alternative forms and modified forms. The scope of the present invention is intended to be limited by the appended claims and their equivalents.

Claims

1. An electric vehicle, comprising: a first battery and a second battery; a power conversion device electrically connected between the first battery and the second battery; as well as A controller operatively connected to the power conversion device and configured to: Based on the charging limit current of the first battery and the charging limit current of the second battery and the charging current distribution ratio determined by the state of charge value of the first battery and the state of charge value of the second battery, a charging current command value of the first battery and a charging current command value of the second battery are determined according to the external charging current value, The power conversion device is controlled to distribute the external charging current to the first battery and the second battery according to the charging current command value.

2. The electric vehicle according to claim 1, wherein: The controller is further configured to determine the remaining charging capacity of the first battery based on the power state value of the first battery, determine the remaining charging capacity of the second battery based on the power state value of the second battery, and set the ratio of the remaining charging capacity of the first battery to the remaining charging capacity of the second battery as the charging current distribution ratio.

3. The electric vehicle according to claim 1, wherein: The controller is further configured to distribute the external charging current value according to the charging current distribution ratio to determine the charging current distribution value of the first battery and the charging current distribution value of the second battery, compare the charging current distribution value with the charging limit current value, and set the charging current command value based on the comparison result.

4. The electric vehicle according to claim 3, wherein: In response to the charging current distribution value of the first battery being less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery being less than or equal to the charging limit current value of the second battery, the controller is further configured to: set the charging current distribution value of the first battery to the charging current command value of the first battery, and set the charging current distribution value of the second battery to the charging current command value of the second battery.

5. The electric vehicle according to claim 3, wherein: In response to the charging current distribution value of the first battery exceeding the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeding the charging limit current value of the second battery, the controller is further configured to: set the charging limit current value of the first battery as the charging current command value of the first battery, and set the charging limit current value of the second battery as the charging current command value of the second battery.

6. The electric vehicle according to claim 3, wherein: In response to the charging current distribution value of the first battery exceeding the charging limit current value of the first battery, and the charging current distribution value of the second battery being less than or equal to the charging limit current value of the second battery, the controller is further configured to: set the charging limit current value of the first battery as the charging current command value of the first battery, and set the smaller value of the sum of the charging limit current value of the second battery, the charging current distribution value of the second battery and the remaining current distribution value of the first battery as the charging current command value of the second battery, The remaining current distribution value of the first battery corresponds to a difference between the charging current distribution value of the first battery and the charging limit current value of the first battery.

7. The electric vehicle according to claim 3, wherein: In response to the charging current distribution value of the first battery being less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeding the charging limit current value of the second battery, the controller is further configured to: set the charging limit current value of the second battery as the charging current command value of the second battery, and set the smaller value of the sum of the charging limit current value of the first battery, the charging current distribution value of the first battery and the remaining current distribution value of the second battery as the charging current command value of the first battery, The remaining current distribution value of the second battery corresponds to a difference between the charging current distribution value of the second battery and the charging limit current value of the second battery.

8. The electric vehicle according to claim 1, wherein: The controller is further configured to redetermine the charging current command value in response to a change in at least either the charging limit current value or the state of charge value.

9. A method for controlling an electric vehicle, the method comprising: The controller determines a charging current distribution ratio determined by a state of charge value of the first battery and a state of charge value of the second battery; The controller determines the charging current command value of the first battery and the charging current command value of the second battery according to the external charging current value based on the charging limit current of the first battery and the charging limit current of the second battery and the charging current distribution ratio; The power conversion device is controlled by a controller to distribute the external charging current to the first battery and the second battery according to the charging current command value, the power conversion device being connected between the first battery and the second battery, and the controller being operably connected to the power conversion device.

10. The method according to claim 9, wherein: Determining the charging current distribution ratio includes: determining the remaining charging capacity of the first battery based on the power state value of the first battery, determining the remaining charging capacity of the second battery based on the power state value of the second battery, and setting the ratio of the remaining charging capacity of the first battery to the remaining charging capacity of the second battery as the charging current distribution ratio.

11. The method according to claim 9, wherein: Determining the charging current command value includes: allocating the external charging current value according to the charging current distribution ratio to determine the charging current distribution value of the first battery and the charging current distribution value of the second battery, and comparing the charging current distribution value with the charging limit current value to set the charging current command value based on the comparison result.

12. The method according to claim 11, wherein: In response to the charging current distribution value of the first battery being less than or equal to the charging limit current value of the first battery, and the charging current distribution value of the second battery being less than or equal to the charging limit current value of the second battery, setting of the charging current command value is performed to set the charging current distribution value of the first battery to the charging current command value of the first battery, and to set the charging current distribution value of the second battery to the charging current command value of the second battery.

13. The method according to claim 11, wherein: In response to the charging current distribution value of the first battery exceeding the charging limit current value of the first battery, and the charging current distribution value of the second battery exceeding the charging limit current value of the second battery, the setting of the charging current command value is performed to set the charging limit current value of the first battery to the charging current command value of the first battery, and to set the charging limit current value of the second battery to the charging current command value of the second battery.

14. The method according to claim 11, wherein: In response to the charging current distribution value of the first battery exceeding the charging limit current value of the first battery and the charging current distribution value of the second battery being less than or equal to the charging limit current value of the second battery, setting of the charging current command value is performed to set the charging limit current value of the first battery as the charging current command value of the first battery and to set a smaller value of the sum of the charging limit current value of the second battery, the charging current distribution value of the second battery and the remaining current distribution value of the first battery as the charging current command value of the second battery, The remaining current distribution value of the first battery corresponds to a difference between the charging current distribution value of the first battery and the charging limit current value of the first battery.

15. The method according to claim 11, wherein: In response to the charging current distribution value of the first battery being less than or equal to the charging limit current value of the first battery and the charging current distribution value of the second battery exceeding the charging limit current value of the second battery, setting of the charging current command value is performed to set the charging limit current value of the second battery to the charging limit current value of the second battery and to set the smaller value of the sum of the charging limit current value of the first battery, the charging current distribution value of the first battery and the remaining current distribution value of the second battery as the charging current command value of the first battery, The remaining current distribution value of the second battery corresponds to a difference between the charging current distribution value of the second battery and the charging limit current value of the second battery.

16. The method according to claim 11, further comprising: The charging current command value is re-determined in response to a change in at least either the charging limit current value or the state of charge value.

17. A non-volatile computer-readable recording medium having a program recorded therein for executing a method of controlling an electric vehicle by a processor, the recording medium storing a program for implementing the following: Determine a charging current distribution ratio determined by a state of charge value of the first battery and a state of charge value of the second battery; determining a charge current command value for the first battery and a charge current command value for the second battery according to an external charge current value based on the charge limit current of the first battery and the charge limit current of the second battery and a charge current distribution ratio; A power conversion device connected between the first battery and the second battery is controlled to distribute the external charging current to the first battery and the second battery according to the charging current command value.

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