Battery management device, vehicle, and method for controlling vehicle

Abstract

The present invention relates to a battery management device, a vehicle, and a method for controlling the vehicle. A method for controlling a vehicle having an electric motor, an engine, and a battery includes: detecting voltage values of a plurality of battery cells disposed in the battery; identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells; obtaining a voltage deviation value between the identified maximum voltage value and the identified minimum voltage value; obtaining a degradation rate of the battery; obtaining a power limit value of the battery based on at least one of the voltage deviation value or the degradation rate of the battery; obtaining a final power limit value based on the obtained power limit value and a preset weight; and controlling discharge of the battery based on the obtained final power limit value.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based upon and claims the benefit of priority from Korean Patent Application No. 10-2020-0048248 filed on April 21, 2020, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to a battery management device for preventing battery degradation, a vehicle having the battery management device, and a method of controlling the vehicle. Background Art

[0004] The vehicle controls starting by using a battery, and when starting is completed, the vehicle includes motor vehicles (internal combustion engine driven cars) that are driven by mechanical power generated by burning fuel such as gasoline and diesel, and environmentally friendly vehicles that are driven by electricity to reduce harmful fuel emissions and improve fuel efficiency.

[0005] Environmentally friendly vehicles include electric vehicles, hybrid vehicles and hydrogen fuel cell vehicles; electric vehicles have a rechargeable power source consisting of a battery and an electric motor, use the electricity charged in the battery to rotate the electric motor, and use the rotation of the drive motor to drive the wheels; hybrid vehicles have an engine, a battery and an electric motor and are driven by controlling the mechanical power of the engine and the electricity of the drive motor.

[0006] Unlike other mechanical components, the batteries of environmentally friendly vehicles have the characteristic of degrading their performance as they are used.

[0007] More specifically, as a vehicle's mileage increases, the performance of the numerous battery cells that make up the battery gradually deteriorates. Even when the same current is used as performance degrades, the voltage characteristic curve between each battery cell changes. This causes errors in the state of charge (SOC) between each battery cell, and as a result, the battery rapidly deteriorates, leading to a shorter-than-expected battery life.

[0008] Although the performance of the battery has declined, it does not mean that it cannot be used, but there is a problem of causing inconvenience to users in driving the vehicle.

[0009] The information disclosed in the above Background section is for assistance in understanding the background of the invention and should not be considered as an admission that this information constitutes any part of the prior art. Summary of the Invention

[0010] An aspect of the present invention is to provide a battery management device that adjusts a power limit value of a battery based on voltage values of a plurality of battery cells of a battery and a degradation rate of the battery, a vehicle having the same, and a method of controlling the vehicle.

[0011] Another aspect of the present invention is to provide a battery management device, a vehicle having the battery management device, and a method for controlling the vehicle, wherein the battery management device updates a weight for adjusting a power limit value based on voltage values of multiple battery cells of a battery and adjusts the battery usage time based on a degradation rate of the battery.

[0012] Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

[0013] According to one aspect of the present invention, a battery management device includes: a battery having a plurality of battery cells; a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information about the detected voltage values; a storage device configured to store a first mapping in which power limit values corresponding to voltage deviation values are matched; and a management controller configured to identify a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells to obtain a voltage deviation value between the maximum voltage value and the minimum voltage value, to obtain a first power limit value of the battery corresponding to the voltage deviation value based on the first mapping, and to control discharge of the battery based on the first power limit value of the battery.

[0014] The battery management device may further include a communication device configured to transmit the first power limit value of the battery to the vehicle controller in response to a control command of the management controller.

[0015] When the voltage deviation value exceeds the first reference value, the management controller may be configured to obtain a first final power limit value based on the first power limit value of the battery and a preset weight.

[0016] When controlling discharge of the battery based on the first final power limit value, the management controller may be configured to identify a minimum voltage value among voltage values of the plurality of battery cells and update the preset weight when the minimum voltage value is less than a second reference value.

[0017] When updating the preset weight, the management controller can be configured to: update the preset weight based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and the value obtained by subtracting the minimum voltage value from the second reference value exceeds the third reference value, and update the preset weight based on the set value and the second predetermined ratio when the value obtained after subtraction is less than or equal to the third reference value.

[0018] The storage device may be configured to store a second map in which power limit values corresponding to degradation rates of the batteries are matched. The management controller may be configured to: obtain the degradation rate of the battery when the voltage deviation value is less than or equal to a first reference value; obtain a second power limit value corresponding to the degradation rate of the battery based on the second map when the degradation rate of the battery exceeds the reference degradation rate; and obtain a second final power limit value based on the second power limit value and a preset weight.

[0019] When controlling discharge of the battery based on the second final power limit value, the management controller may be configured to identify a minimum voltage value among voltage values of the plurality of battery cells and update the preset weight when the minimum voltage value is less than a second reference value.

[0020] When updating the preset weight, the management controller can be configured to: update the preset weight based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and the value obtained by subtracting the minimum voltage value from the second reference value exceeds the third reference value, and update the preset weight based on the set value and the second predetermined ratio when the value obtained after subtraction is less than or equal to the third reference value.

[0021] The storage device may be configured to store a third map in which power limit values corresponding to respective voltage values of the batteries are matched. When the voltage deviation value is less than or equal to a first reference value and the obtained degradation rate of the battery is less than or equal to a reference degradation rate, it is determined that the battery is in a normal state. The management controller may be configured to obtain a third power limit value corresponding to the normal state of the battery based on the third map, and to obtain a third final power limit value based on the third power limit value and a preset weight.

[0022] When controlling discharge of the battery based on the third final power limit value, the management controller may be configured to identify a minimum voltage value among voltage values of the plurality of battery cells and update the preset weight when the minimum voltage value is less than a second reference value.

[0023] When updating the preset weight, the management controller can be configured to: update the preset weight based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and the value obtained by subtracting the minimum voltage value from the second reference value exceeds the third reference value, and update the preset weight based on the set value and the second predetermined ratio when the value obtained after subtraction is less than or equal to the third reference value.

[0024] When the obtained degradation rate of the battery exceeds a reference degradation rate, the management controller may be configured to obtain an output reduction time corresponding to the degradation rate of the battery, to obtain a current output available time of the battery based on the reference output available time and the output reduction time, and to control the discharge of the battery based on the current output available time.

[0025] According to another aspect of the present invention, a vehicle includes: wheels that use at least one of power from an electric motor and an engine as driving power; a battery having a plurality of battery cells and configured to supply power to the electric motor; a voltage detector configured to detect voltage values of the plurality of battery cells and output voltage information regarding the detected voltage values; a storage device configured to store a first map in which power limit values corresponding to voltage deviation values are matched; a battery management device including a processor configured to identify a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells, obtain a voltage deviation value between the maximum voltage value and the minimum voltage value and a first power limit value of the battery corresponding to the voltage deviation value based on the first map, and obtain a first final power limit value based on the first power limit value of the battery and a preset weight when the voltage deviation value exceeds a first reference value; and a controller configured to control operation of at least one of the electric motor, the battery, and the engine, and to control discharge of the battery based on the first final power limit value obtained from the battery management device.

[0026] The storage device may be configured to store a second map in which power limit values corresponding to degradation rates of the batteries are matched. The processor of the battery management device may be configured to: obtain the degradation rate of the battery when the obtained voltage deviation value is less than or equal to a first reference value; obtain a second power limit value corresponding to the degradation rate of the battery based on the second map when the degradation rate of the battery exceeds the reference degradation rate; and obtain a second final power limit value based on the second power limit value and a preset weight.

[0027] The storage device may be configured to store a third map in which power limit values corresponding to respective voltage values of the batteries are matched. When the voltage deviation value is less than or equal to a first reference value and the degradation rate of the battery is less than or equal to a reference degradation rate, the battery is determined to be in a normal state. The processor of the battery management device may be configured to obtain a third power limit value corresponding to the normal state of the battery based on the third map, and to obtain a third final power limit value based on the third power limit value and a preset weight.

[0028] When controlling discharge of the battery, the processor of the battery management device may be configured to identify a minimum voltage value among voltage values of the plurality of battery cells and update the preset weight when the minimum voltage value is less than a second reference value.

[0029] When updating the preset weight, the processor of the battery management device can be configured to: update the preset weight based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and the value obtained by subtracting the second reference value from the minimum voltage value exceeds the third reference value, and update the preset weight based on the set value and the second predetermined ratio when the value obtained after subtraction is less than or equal to the third reference value.

[0030] When the obtained degradation rate of the battery exceeds the reference degradation rate, the processor of the battery management device can be configured to obtain the output reduction time corresponding to the degradation rate of the battery, to obtain the current output available time of the battery based on the reference output available time and the output reduction time, and to transmit the current output available time to the controller.

[0031] According to another aspect of the present invention, a method for controlling a vehicle includes a motor, an engine, and a battery. The method includes detecting voltage values of a plurality of battery cells disposed in the battery; identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells; obtaining a voltage deviation value between the identified maximum voltage value and the identified minimum voltage value; obtaining a degradation rate of the battery; obtaining a power limit value of the battery based on at least one of the voltage deviation value and the degradation rate of the battery; obtaining a final power limit value based on the power limit value and a preset weight; and controlling discharge of the battery based on the final power limit value.

[0032] Obtaining the power limit value of the battery may include: when the voltage deviation value exceeds a first reference value, obtaining the power limit value based on a first mapping in which the power limit value corresponding to the voltage deviation value is matched; when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery exceeds the reference degradation rate, obtaining the power limit value based on a second mapping in which the power limit values respectively corresponding to the degradation rates of the battery are matched; and when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, obtaining the power limit value based on a third mapping in which the power limit values respectively corresponding to the voltage values of the battery are matched.

[0033] The method may further include identifying a minimum voltage value among voltage values of the plurality of battery cells when controlling discharge of the battery, and updating the preset weight when the identified minimum voltage value is less than a second reference value. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] These and / or other aspects of the present invention will become more apparent and more easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0035] Figure 1 is a view showing a chassis of a vehicle according to an exemplary embodiment of the present invention.

[0036] Figure 2 is a control block diagram of a vehicle according to an exemplary embodiment of the present invention.

[0037] Figure 3 for Figure 2 The control block diagram of the battery management device is shown.

[0038] Figure 4 FIG. 4 is a control flowchart of a vehicle according to an exemplary embodiment of the present invention.

[0039] Figure 5 A control flowchart for updating weights during vehicle control according to an exemplary embodiment of the present invention.

[0040] Figure 6 FIG. 4 is a graph showing voltage values corresponding to usage time of a battery of a vehicle according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0041] Throughout the specification, the same reference numerals refer to the same elements. Not all elements of the embodiments of the present invention will be described, and descriptions that are well known in the art or that overlap with each other in exemplary embodiments will be omitted. Terms used throughout the specification, such as "~ component", "~ module", "~ member", "~ block", etc., can be implemented with software and / or hardware, and multiple "~ components", "~ modules", "~ members", "~ blocks" can be implemented in a single element, or a single "~ component", "~ module", "~ member", "~ block" can include multiple elements.

[0042] It will also be understood that the term "connect" and its derivatives refer to both direct and indirect connections, and that indirect connections include connections through wireless communication networks.

[0043] Unless otherwise mentioned, the term "comprise (or include)" is inclusive or open-ended and does not exclude other unrecited elements or method steps. It will also be understood that the term "component" and its derivatives refer to both the situation where a component is in contact with another component and the situation where another component exists between two components.

[0044] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section.

[0045] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0046] The reference numerals used for the method steps are used only for convenience of explanation and do not limit the order of the steps. Therefore, unless the context clearly indicates otherwise, the written order can be implemented in other ways.

[0047] Hereinafter, the operation principle and embodiments of the present invention will be described with reference to the accompanying drawings.

[0048] Figure 1 is a view showing a chassis of a vehicle according to an exemplary embodiment of the present invention.

[0049] The vehicle 1 according to the embodiment is a hybrid vehicle that is driven by an engine, a battery, and an electric motor, and controls the mechanical power of the engine and the electric power of the electric motor.

[0050] The vehicle may include a body having exterior and interior components and a chassis, which is a component of the vehicle 1 other than the body, on which mechanical devices required for driving are mounted.

[0051] refer to Figure 1 The power system 140 may include an engine 142, a fuel system, a cooling system, a refueling system, a battery 143, an electric motor 144, a generator 145, an inverter 146, a clutch 147, a transmission 148, and a final reduction and differential gear 149, and further includes an actuator 147a for driving the clutch 147.

[0052] The engine 142 may combust fuel such as gasoline and diesel to generate mechanical power and transmit the power to the clutch 147 .

[0053] The battery 143 may generate electric power having a high-voltage current and supply the electric power to the motor 144 , the generator 145 , and various electrical devices in the vehicle.

[0054] Various electrical devices in a vehicle may include vehicle terminals, audio devices, and lights.

[0055] The battery 143 may be charged by receiving power supplied from the generator 145 .

[0056] The battery 143 may include a plurality of battery cells 143 a .

[0057] The battery 143 may be managed by a battery management device 160. The battery management device 160 will be described later.

[0058] The battery 143 may include a battery capable of charging and discharging.

[0059] The number of batteries provided in the vehicle may be one or two.

[0060] For example, the vehicle may include a main battery that provides driving force to a powertrain including the electric motor 144 , and an auxiliary battery that provides driving force to electronic devices such as convenience devices and additional devices.

[0061] The main battery may be charged using the electric power generated by the generator driven during regenerative braking, and the auxiliary battery may be charged using the electric power charged in the main battery.

[0062] The electric motor 144 may generate a rotational force (also referred to as rotational power) using the electric energy from the battery 143 , and transmit the rotational force to the wheels 141 to drive the wheels 141 .

[0063] Once connected to the engine 142 through the clutch 147, the motor 144 transmits its rotational force together with the rotational force of the engine 142 to the wheels 141. The motor 144 can also perform the function of absorbing the shock from the closing of the clutch 147 while performing the function of a conventional torque converter.

[0064] In addition, the electric motor 144 may convert the electric energy of the battery 143 into mechanical energy for operating various electric devices provided in the vehicle.

[0065] Due to braking, deceleration, or low-speed driving, the electric motor 144 may function as a generator in a regenerative braking mode, thereby enabling the battery 143 to be charged.

[0066] A generator 145 , such as a hybrid starter generator (HSG), may be connected to the crankshaft of the engine 142 , engaged with the crankshaft of the engine 142 , and may be used as a starter motor when the engine 142 is started, and may be operated as a generator by the engine 142 to enable the battery 143 to be charged when the wheels 141 are not driven by the engine 142 .

[0067] In some exemplary embodiments, the generator 145 may function as a generator through the power transmitted by the engine 142 , thereby enabling the battery 143 to be charged.

[0068] The vehicle may also charge the battery 143 by receiving and using electricity from a charger located in a parking lot or charging station.

[0069] The vehicle power system 140 may further include a power converter for converting the power generated by the generator 145 into chargeable power for the battery 143 and converting the power of the battery 143 into driving power for the generator 145. The power converter may be a type of converter.

[0070] The power converter may also perform the function of changing the direction and output of the current between the generator 145 and the battery 143 .

[0071] The inverter 146 can convert the electric power from the battery 143 into driving power for the electric motor 144 .

[0072] The inverter 146 may output driving power for the motor 144 based on the target speed from the user command. The driving power of the motor 144 may be a switching signal for outputting a current corresponding to the target speed and a switching signal for outputting a voltage corresponding to the target speed.

[0073] Therefore, the inverter 146 may include a plurality of switching devices.

[0074] A clutch 147 may be disposed between the engine 142 and the motor 144 .

[0075] The clutch 147 can be closed or locked when both the engine 142 and the motor 144 are used to generate driving force for the wheels 141, and can be opened by a spring pushed back by the hydraulic pressure generated by the drive of an actuator (e.g., a hydraulic clutch actuator (HCA)) when only the motor 144 is used to generate driving force for the wheels 141.

[0076] That is, the clutch 147 may be in an open state or a closed state according to the driving mode of the vehicle.

[0077] More specifically, the clutch 147 may be opened when the motor 144 is used for deceleration or low-speed driving, and may be opened even when braking. The clutch 147 may be closed when driving uphill, for acceleration or constant-speed driving at a certain speed or above, and may be closed when the battery 143 is in protection mode.

[0078] The clutch 147 may be a normally closed clutch that connects the engine 142 and the motor 144 when the vehicle power is disconnected.

[0079] The transmission 148 may transfer the rotational motion of the engine 142 and the motor 144 to the wheels 141 , or transfer the rotational motion of the motor 144 to the wheels 141 .

[0080] The transmission 148 may be a dual clutch transmission (DCT) that utilizes two clutches to manipulate gears.

[0081] The transmission 148 automatically performs optimal torque conversion by enabling gears to be automatically manipulated based on the vehicle's driving speed.

[0082] The vehicle may further include a final reduction and differential gear (FD) 149 disposed between the transmission 148 and the wheels 141 .

[0083] The FD may include a final drive and a differential gear.

[0084] The final reduction gear can convert the revolutions per minute (rpm) of the motor 144 so that the vehicle's travel speed reaches a target speed. In other words, the final reduction gear can generate a driving force corresponding to the converted rpm of the motor 144 and transmit the generated driving force to the left and right wheels 141, 141, respectively.

[0085] The final reduction device can also convert the input rpm of the electric motor 144 into a certain ratio.

[0086] Here, the target speed may be a speed corresponding to the pressure of the accelerator pedal or the brake pedal.

[0087] The final reduction gear may include a drive pinion and a ring gear, and may reduce the rotational speed and change the rotational direction to a right angle. That is, the final reduction gear may increase the driving force by further reducing the speed between the transmission 148 and the wheels 141, while simultaneously changing the direction of power transmission.

[0088] In the final reduction gear, the drive pinion gear can receive the rotational force of the propeller shaft 148a and change it to a nearly right angle, while reducing the speed and transmitting it to the differential gear. The final reduction gear can transmit the changed rotational force of the propeller shaft to the rear axle and increase the rotational force through final reduction.

[0089] The differential gear may allow the left wheel 141 and the right wheel 141 to rotate at different speeds.

[0090] That is, the differential gear may generate driving force for the left wheel 141 and the right wheel 141 by adjusting the gear ratio of the transmission 148 , and transmit the generated driving force to the left wheel 141 and the right wheel 141 , respectively.

[0091] In this embodiment, the power system 140 may have a parallel configuration in which both the engine 142 and the motor 144 are connected to an axle 149 a of the vehicle to simultaneously drive the vehicle.

[0092] In electric vehicle (EV) mode, in which the vehicle is driven only by the motor 144, the vehicle opens the clutch 147 to prevent the motor 144 and the engine 142 from being mechanically connected, thereby directly transmitting the rotation of the motor 144 to the transmission 148. At this time, the engine 142 can be turned off and can be driven while the battery is charged.

[0093] Furthermore, the vehicle closes the clutch 147 when being driven by operation of both the engine 142 and the motor 144 (in a hybrid vehicle (HEV) mode) to add the rotational force of the engine 142 to the rotational force of the motor 144 and then transmit to the transmission 148 .

[0094] Even when the vehicle is driven by only the engine 142 , since the engine 142 needs to be connected to the axle 149 a , the vehicle closes the clutch 147 to rotate the engine 142 together with the motor 144 .

[0095] Figure 2 is a control block diagram of a vehicle according to an exemplary embodiment of the present invention, Figure 3 for Figure 2 The control block diagram of the battery management device is shown.

[0096] refer to Figure 2 , the vehicle may include a speed detector 111 , a first pressure detector 112 , a second pressure detector 113 , a display 120 , and a controller 130 .

[0097] The vehicle may further include a battery management device 160 that monitors the state of charge (SOC) and abnormal conditions of the battery 143 and outputs status information for monitoring.

[0098] The speed detector 111 may detect the speed of the vehicle and output driving speed information regarding the detected speed.

[0099] The speed detector 111 may include a wheel speed sensor provided on each of the front, rear, left, and right wheels to detect the rotation speed of each wheel 141 , or may include an acceleration detector for detecting acceleration of the vehicle.

[0100] The first pressure detector 112 may detect pressure applied to the accelerator pedal and output first pressure information regarding the detected pressure.

[0101] The second pressure detector 113 may detect pressure applied to the brake pedal and output second pressure information regarding the detected pressure.

[0102] The first pressure detector 112 and the second pressure detector 113 may be pressure sensors.

[0103] Display 120 may display the EV mode using only the power of motor 144 , and may display the HEV mode using the power of engine 142 and motor 144 .

[0104] The display 120 may also display information regarding a low voltage condition of the battery 143 .

[0105] That is, the display 120 may display information about the abnormal state of the battery 143 .

[0106] In addition, the display 120 may be a display provided in a host unit, a display provided in a dashboard, or a display provided in a user interface.

[0107] The display 120 may be a lamp, such as a light emitting diode (LED), separately provided inside the vehicle.

[0108] The controller 130 can obtain the user's required power based on the first pressure information or the second pressure information and the driving speed (i.e., vehicle speed) information, obtain the target driving speed of the vehicle corresponding to the obtained user-requested power, and control the operation of at least one of the engine 142 and the motor 144 based on the obtained target driving speed of the vehicle. In this way, the vehicle can be driven by the power generated by at least one of the engine 142 and the motor 144.

[0109] The controller 130 can control the execution of the EV mode of driving the vehicle using only the power of the motor 144 based on the vehicle's target driving speed, acceleration driving and climbing driving, and can control the execution of the HEV mode of driving the vehicle using the power of the motor 144 and the engine 142.

[0110] The controller 130 may control operation of the motor in the actuator 147 a to control closing of the clutch 147 , and control pressure of fluid supplied to the clutch 147 to open and close the clutch 147 , so that driving in the EV mode and the HEV mode may be performed.

[0111] When the clutch 147 is of a normally closed type, the configuration of the controller 130 of the embodiment will be described.

[0112] When the driving mode is the EV mode, the controller 130 may control the clutch 147 to be open and control the rotation speed of the motor 144 based on the target driving speed.

[0113] When controlling the speed of the motor 144 , the controller 130 may control switching of the inverter 146 .

[0114] When the driving mode is the HEV mode, the controller 130 may control the clutch 147 to be in a closed state, and control the rotation speed of the engine 142 and the rotation speed of the motor 144 based on the target driving speed.

[0115] When the driving mode is the HEV mode, the controller 130 may control the operation of the generator 145 to start the engine 142 and control the driving of the engine 142 .

[0116] The controller 130 may communicate with the battery management device 160 while traveling in the HEV mode, and may receive status information of the battery 143 from the battery management device 160 .

[0117] Here, the state information of the battery 143 may include charging state information of the battery 143 and abnormal state information of the battery 143. The SOC of the battery 143 may include a charge amount of the battery 143.

[0118] The state information of the battery 143 may include the SOC of the battery 143 and a voltage value of the battery 143 , and may further include at least one of power limit values of the battery 143 .

[0119] Here, the power limit value of the battery 143 may be power available through the battery 143 when power required by the user is constant during discharge of the battery 143 or when reference power is preset.

[0120] When driving in EV mode, the controller 130 can determine whether to switch to HEV mode based on the power limit value of the battery 143 and the target driving speed, and when it is determined that the controller 130 needs to switch to HEV, when the battery 143 is discharged, the controller 130 can control the closing of the clutch 147 installed between the engine 142 and the motor 144 based on the limit power value of the battery 143 and limit the output of the motor 144.

[0121] The controller 130 can control the operation of the generator 145 based on the SOC of the battery 143 and the temperature of the battery 143 when traveling in EV mode or HEV mode to operate the engine 142, and can charge the battery 143 by causing the generator 145 to perform the function of the generator 145 through the operation of the engine 142.

[0122] The controller 130 may receive information about a current output available time of the battery 143 from the battery management device 160 and control operations of the power system 140 and the electronic devices based on the received information about a current output available time of the battery 143 .

[0123] When the clutch 147 is in a closed state, the engine 142 can transmit the generated power to the wheels 141 and the generator 145 .

[0124] The generator 145 may charge the battery 143 when the engine 142 is started based on a control command of the controller 130 or performs a function as a generator by power of the engine 142 .

[0125] The inverter 146 may convert DC power supplied from the battery 143 into three-phase AC power based on a control command of the controller 130 and apply the converted AC power to the motor 144 .

[0126] The actuator 147a may move oil to the clutch 147 by driving the motor provided therein to generate hydraulic pressure in the clutch 147. At this time, the clutch 147 may be opened while the spring in the clutch 147 is pushed by the hydraulic pressure generated therein.

[0127] The controller 130 according to an exemplary embodiment of the present invention may include: a non-transitory memory storing an algorithm for controlling the operation of components in the vehicle or data related to a program implementing the algorithm; and a processor that uses the data stored in the memory to perform the aforementioned operations. The memory and the processor may be implemented in separate chips. Alternatively, the memory and the processor may be implemented in a single chip.

[0128] The controller 130 may be an electronic control unit (ECU) that controls the travel of the vehicle, and may be any one of a microcomputer, a CPU, and a processor.

[0129] refer to Figure 3 The battery management device 160 may include a temperature detector 161 , a voltage detector 162 , a management controller 163 , a storage device 164 , and a communication device 165 , and may further include a current detector 166 .

[0130] The temperature detector 161 (eg, a temperature sensor, etc.) may detect the temperature of the battery 143 and output temperature information regarding the detected temperature.

[0131] The voltage detector 162 (eg, a voltage sensor, etc.) may detect the voltage of the battery 143 and output voltage information regarding the detected temperature.

[0132] There may be a plurality of voltage detectors 162. The plurality of voltage detectors 162 are connected to output terminals of the plurality of battery cells of the battery 143 to respectively detect voltages of the plurality of battery cells.

[0133] The battery management device 160 may further include a switch connected to a voltage detector 162. The switch may be selectively connected to a plurality of battery cells. The voltage detector 162 may detect the voltages of the plurality of battery cells, respectively, and output voltage information about the voltage of each detected battery cell in response to a change in the switch's contact point.

[0134] The battery management device 160 may further include a current detector 166 that detects a current of the battery 143 and outputs current information about the detected current.

[0135] The management controller 163 may obtain charging state information of the battery 143 based on the detected current information and voltage information of the battery 143 , and output the obtained charging state information of the battery 143 to the controller 130 .

[0136] Here, the charging state information of the battery 143 may be the charging amount of the battery 143 or the charging level of the battery 143 .

[0137] The management controller 163 can obtain the voltage values of multiple battery cells respectively based on the received voltage information of the multiple battery cells, identify the maximum voltage value and the minimum voltage value among the obtained voltage values of the multiple battery cells, obtain the voltage deviation value by subtracting the minimum voltage value from the maximum value, and compare the obtained voltage deviation value with the first reference value.

[0138] When it is determined that the obtained voltage deviation value exceeds the first reference value, the management controller 163 may obtain a power limit value based on the first map stored in the storage device 164 .

[0139] When the power limit value (P delta ) when the management controller 163 can be based on the power limit value (P delta ) and weights (factors) to obtain the final power limit value.

[0140] Final power limit value = weight (factor) * power limit value (P delta )

[0141] The initial value of the weight can be 1.

[0142] When limiting the output of the motor 144 based on the obtained final power limit value, the management controller 163 may again obtain the voltage values of the plurality of battery cells based on the received voltage information of the plurality of battery cells, identify the minimum voltage value among the obtained voltage values of the plurality of battery cells, and compare the identified minimum voltage value with a second reference value. As a result of comparing the minimum voltage value with the second reference value, the management controller 163 may determine whether the minimum voltage value is less than the second reference value.

[0143] The management controller 163 may update the weight when determining that the minimum voltage value is less than the second reference value, and initialize the weight when determining that the minimum voltage value is greater than or equal to the second reference value.

[0144] Updating the weight may include obtaining the weight based on a weight table stored in the storage device 164 and updating the current weight using the obtained weight.

[0145] The management controller 163 may later update the current weight to obtain a power limit value.

[0146] Initializing the weights may include setting the weights to 1.

[0147] When it is determined that the obtained voltage deviation value is less than or equal to the first reference value, the management controller 163 may identify a degradation rate of the battery 143 and compare the identified degradation rate with a reference degradation rate.

[0148] Deterioration of the battery 143 may include capacity degradation and internal resistance degradation.

[0149] The identified degradation rate of the battery 143 may be a degradation rate corresponding to the life span of the battery 143. In this case, the storage device 164 may store the degradation rate corresponding to the life span.

[0150] The management controller 163 may obtain the degradation rate of the battery 143 based on the temperature and the charge rate of the battery 143 .

[0151] The management controller 163 may obtain the degradation rate of the battery 143 based on the capacity reduced compared to the rated capacity of the battery 143 .

[0152] When determining that the degradation rate of the battery 143 exceeds the reference degradation rate, the management controller 163 may obtain the power limit value (P soh ).

[0153] When the power limit value (P soh ) when the management controller 163 can be based on the power limit value (P soh ) and weights (factors) to obtain the final power limit value.

[0154] Final power limit value = weight (factor) * power limit value (P soh )

[0155] The initial value of the weight can be 1.

[0156] When it is determined that the degradation rate of the battery 143 is less than or equal to the reference degradation rate, the management controller 163 may determine that the battery is in a normal state and obtain a power limit value (P normal ).

[0157] When the power limit value (P normal ) when the management controller 163 can be based on the power limit value (P normal ) and the weight (factor) corresponding to the normal state to obtain the final power limit value.

[0158] Final power limit value = weight (factor) * power limit value (P normal )

[0159] The initial value of the weight can be 1.

[0160] The managing controller 163 may limit the output of the electric motor 144 based on the obtained final power limit value.

[0161] The management controller 163 may determine a power limit value based on the voltage deviation between the battery cells and the degradation rate of the battery 143 , and the management controller 163 may transmit the power limit value to the controller 130 .

[0162] The management controller 163 may identify voltage information about the voltage of the battery 143 detected when the EV mode is executed, and determine whether the voltage value of the battery 143 is less than a second reference value based on the identified voltage information. When it is determined that the voltage value of the battery 143 is less than the second reference value, the management controller 163 may update the weight to prevent battery damage.

[0163] The management controller 163 may identify a minimum voltage value among the voltage values of the plurality of battery cells. When the second reference value is less than the minimum voltage value, the management controller 163 may subtract the minimum voltage value from the second reference value to obtain a subtraction value (difference). When it is determined that the obtained subtraction value exceeds the third reference value, the management controller 163 may obtain a final weight by subtracting a first predetermined ratio of the set value from the current weight and update the current weight to the obtained final weight.

[0164] When it is determined that the obtained subtraction value is less than or equal to the third reference value, the management controller 163 may obtain a final weight by subtracting a second predetermined ratio of the set value from the current weight and update the current weight with the obtained final weight.

[0165] Here, the ratio of changing the set value may vary according to the obtained subtraction value.

[0166] The management controller 163 may identify the output reduction time of the battery 143 corresponding to the current degradation rate of the battery 143. When the degradation rate of the battery 143 exceeds the reference degradation rate, the management controller 163 may obtain the current output available time of the battery 143 based on the previously stored reference output available time of the battery 143 and the output reduction time of the battery 143, and transmit information on the obtained current output available time of the battery 143 to the controller 130.

[0167] The storage device 164 may store information about the output reduction time of the battery 143 corresponding to the degradation rate of the battery 143 and the reference output available time of the battery 143 .

[0168] The storage device 164 may store information about the first reference value, the second reference value, the third reference value, and the reference degradation rate.

[0169] The storage device 164 may store a first map in which a power limit value corresponding to a voltage difference between a maximum voltage value and a minimum voltage value is matched.

[0170] The storage device 164 may store a second map in which the power limit value corresponding to the degradation rate of the battery 143 is matched.

[0171] The storage device 164 may store a third map in which a power limit value corresponding to the voltage value of the battery 143 is matched when the battery 143 is in a normal state. Here, the voltage value of the battery 143 matched with the third map may be any one of an average voltage value, a minimum voltage value, and a maximum voltage value of the plurality of battery cells.

[0172] The storage device 164 may store the degradation rate corresponding to the service life.

[0173] The storage device 164 may store the output reduction time corresponding to the degradation rate of the battery 143 as a table.

[0174] The storage device 164 may store a table in which the charge amount of the battery 143 corresponding to the correlation between the current, voltage, and temperature of the battery 143 is matched.

[0175] The storage device 164 may be a memory implemented as a chip separate from the above-mentioned processor regarding the management controller 163 , or may be integrated with the processor in a single chip.

[0176] The storage device 164 can be implemented with at least one of a non-volatile memory device (such as cache, read-only memory (ROM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM)), a volatile memory device (such as random access memory (RAM)) and a storage medium (such as a hard disk drive (HDD) or a compact disk (CD) ROM), but is not limited thereto.

[0177] The communication device 165 may communicate with the controller 130 and transmit status information of the battery 143 to the controller 130 .

[0178] The communication device 165 may include at least one communication module configured to communicate with the controller 130. The communication module may be a hardware device implemented by various electronic circuits (e.g., a processor) to send and receive signals via wireless or wired connections. For example, the communication device 165 may include at least one of a short-range communication module, a wired communication module, and a wireless communication module.

[0179] The short-range communication module may include various short-range communication modules configured to send and receive signals using a short-range wireless communication module (e.g., a Bluetooth module, an infrared communication module, a radio frequency identification (RFID) communication module, a wireless local area network (WLAN) communication module, an NFC communication module, and a ZigBee communication module).

[0180] The wired communication module may include various wired communication modules, such as a controller area network (CAN) module, a local area network (LAN) module, a wide area network (WAN) module, or a value-added network (VAN) module, and various wired communication modules, such as a universal serial bus (USB), a high-definition multimedia interface (HDMI), a digital video interface (DVI), a recommended standard 232 (RS-232), power line communication, or plain old telephone service (POTS).

[0181] The wireless communication module may include a wireless communication module supporting various wireless communication methods, such as a Wi-Fi module, a wireless broadband module, a Global System for Mobile (GSM) communication, a Code Division Multiple Access (CDMA), a Wideband Code Division Multiple Access (WCDMA), a Time Division Multiple Access (TDMA), and a Long Term Evolution (LTE).

[0182] Figure 4 FIG. 4 is a control flowchart of a vehicle according to an exemplary embodiment of the present invention.

[0183] The vehicle may obtain voltage information corresponding to the voltage of the battery cells of the battery 143 detected by the voltage detector 162 provided in the battery management device 160 .

[0184] The vehicle can obtain voltage values of a plurality of battery cells based on voltage information of the plurality of battery cells (201), and identify a maximum voltage value and a minimum voltage value among the obtained voltage values of the plurality of battery cells (202).

[0185] The vehicle may obtain a voltage deviation value by subtracting the minimum voltage value from the identified maximum voltage value, and compare the obtained voltage deviation value with the first reference value.

[0186] When the vehicle determines that the obtained voltage deviation value exceeds the first reference value as a result of comparing the obtained voltage deviation value and the first reference value ( 203 ), the vehicle may obtain a power limit value based on a first map stored in storage device 164 ( 204 ).

[0187] When the obtained voltage deviation value exceeds the first reference value, it means that the degradation of the battery 143 has exceeded the reference value. That is, when the obtained voltage deviation value exceeds the first reference value, it means that the battery 143 is in an abnormal state.

[0188] When the power limit value (P delta ) when the vehicle can be based on the power limit value (P delta ) and weights (factors) to obtain the final power limit value.

[0189] Final power limit value = weight (factor) * power limit value (P delta )

[0190] The initial value of the weight can be 1.

[0191] The vehicle can control the discharge of the battery 143 based on the obtained final voltage deviation value.

[0192] When the obtained voltage deviation value exceeds the first reference value, the vehicle may limit the output of the electric motor 144 based on the obtained final power limit value.

[0193] When limiting the output of the motor 144 based on the obtained final power limit value, the vehicle may obtain voltage values of the plurality of battery cells based on the received voltage information of the plurality of battery cells, identify a minimum voltage value among the obtained voltage values of the plurality of battery cells, and compare the identified minimum voltage value with a second reference value. As a result of comparing the minimum voltage value with the second reference value, the vehicle may determine whether the minimum voltage value is less than the second reference value (205).

[0194] The vehicle may update the weight ( 206 ) when determining that the minimum voltage value is less than a second reference value, and initialize the weight ( 207 ) when determining that the minimum voltage value is greater than or equal to the second reference value.

[0195] Updating the weight may include obtaining the weight based on a weight table stored in the storage device 164 and updating the current weight using the obtained weight.

[0196] The vehicle can later update the current weight to obtain the power limit value.

[0197] Initializing the weights may include setting the weights to 1.

[0198] When the vehicle determines that the obtained voltage deviation value is less than the first reference value as a result of comparing the obtained voltage deviation value and the first reference value, the vehicle may identify a degradation rate of the battery 143 and compare the identified degradation rate with a reference degradation rate.

[0199] Deterioration of the battery 143 may include capacity degradation and internal resistance degradation.

[0200] The identified degradation rate of the battery 143 may be a degradation rate corresponding to the life span of the battery 143. In this case, the storage device 164 may store the degradation rate corresponding to the life span.

[0201] The vehicle can obtain the degradation rate of the battery 143 based on the temperature and charging rate of the battery 143 .

[0202] The vehicle can obtain the degradation rate of the battery 143 based on the capacity reduced compared to the rated capacity of the battery 143 .

[0203] When the vehicle determines that the degradation rate of the battery 143 exceeds the reference degradation rate as a result of comparing the degradation rate with the reference degradation rate (208), the vehicle may obtain the power limit value (P) based on the second map stored in the storage device. soh )(209).

[0204] When the vehicle obtains the power limit value (P soh ) when the vehicle can be based on the power limit value (P soh ) and weights (factors) to obtain the final power limit value.

[0205] Final power limit value = weight (factor) * power limit value (P soh )

[0206] The initial value of the weight can be 1.

[0207] When the degradation rate of the battery 143 exceeds the reference degradation rate, the vehicle may limit the output of the electric motor 144 based on the obtained final power limit value.

[0208] When the battery 143 deteriorates, the power limit value that the battery 143 can use also changes.

[0209] Therefore, the vehicle can obtain the degradation rate of the battery 143 and use it to obtain the power limit value of the battery 143 based on the obtained degradation rate.

[0210] Even if the battery 143 deteriorates, the output of the battery 143 can maintain the reference output performance. However, the time for maintaining the reference output performance of the battery 143 may vary.

[0211] For example, when the degradation rate of battery 143 is less than or equal to the reference degradation rate, the output performance of 30 kW can be maintained for 10 hours. On the other hand, when the degradation rate of battery 143 exceeds the reference degradation rate, the output performance of 30 kW can be maintained for 5 hours.

[0212] The vehicle may obtain information about a time for maintaining a reference output performance of the battery 143 based on the degradation rate of the battery 143 , and may control charging and discharging of the battery 143 based on the obtained time information.

[0213] When the degradation rate of battery 143 exceeds the reference degradation rate, the vehicle can obtain the current output available time of battery 143 based on the reference output available time of battery 143 and the current degradation rate of battery 143, and control the driving of the vehicle and the operation of electronic devices in the vehicle based on the obtained current output available time of battery 143.

[0214] Current battery output available time = battery reference output available time - output reduction time corresponding to degradation rate

[0215] Here, the output reduction time corresponding to the degradation rate of the battery 143 may be a value obtained through a battery test and may be stored as a table.

[0216] The vehicle can control the discharge of the battery 143 based on the obtained current output available time.

[0217] When the vehicle determines that the degradation rate of the battery 143 is less than or equal to the reference degradation rate, the vehicle may determine that the state of the battery is a normal state, and obtain a power limit value (P normal )(210).

[0218] When the vehicle obtains the power limit value (P normal ) when the vehicle can be based on the power limit value (P normal ) and weights (factors) to obtain the final power limit value.

[0219] Final power limit value = weight (factor) * power limit value (P normal )

[0220] The initial value of the weight can be 1.

[0221] When the battery 143 is in a normal state, the vehicle may limit the output of the electric motor 144 based on the obtained final power limit value.

[0222] Even when the vehicle limits the output of the motor 144 based on the final power limit value corresponding to the degradation rate of the battery 143 and the final power limit value corresponding to the normal state of the battery 143, the vehicle can again identify the voltage information of the plurality of battery cells, again obtain the voltage values of the plurality of battery cells based on the voltage information of the battery cells, identify the minimum voltage value among the obtained voltage values of the plurality of battery cells, and compare the identified minimum voltage value with the second reference value. As a result of comparing the identified minimum voltage value with the second reference value, the vehicle can determine whether the identified minimum voltage value is less than the second reference value (205).

[0223] Next, the vehicle may update the weight ( 206 ) when determining that the identified minimum voltage value is less than a second reference value, and initialize the weight when determining that the identified minimum voltage value is greater than or equal to the second reference value.

[0224] When the degradation rate of the battery 143 is obtained, an error may be included.

[0225] Even if the voltage deviation value of the battery 143 is the same (ie, the state of the battery is in a normal state), the voltage value of the same current may be detected differently according to the internal state of the battery 143 .

[0226] Therefore, in order to protect the battery 143, the vehicle may update the weight based on the minimum voltage value among the voltage values of the battery cells.

[0227] Figure 5 A control flowchart for updating weights during vehicle control according to an exemplary embodiment of the present invention.

[0228] The vehicle may again identify the voltage information of the plurality of battery cells, again obtain the voltage values of the plurality of battery cells based on the voltage information of the plurality of battery cells, and identify a minimum voltage value among the obtained voltage values of the plurality of battery cells. When the second reference value is less than the identified minimum voltage value (211), the vehicle may obtain a subtraction value by subtracting the minimum voltage value from the second reference value.

[0229] The reason for obtaining the subtracted value by subtracting the minimum voltage value from the second reference value is to identify how much the minimum voltage value differs from the second reference value.

[0230] When the subtraction value obtained by subtracting the minimum voltage value from the second reference value is large, it means that the current power limit value is insufficient and therefore the power limit value must be increased. That is, the larger the subtraction value is, the more the power limit value should be increased.

[0231] The vehicle may compare the obtained subtraction value with a third reference value, and when it is determined that the obtained subtraction value exceeds the third reference value as a result of comparing the obtained subtraction value with the third reference value (212), the vehicle may obtain a final weight by subtracting a first predetermined ratio of the set value A from the current weight, and update the current weight using the obtained final weight (213).

[0232] Here, the first predetermined ratio may be a two-fold ratio.

[0233] Final weight = current weight (factor) - 2*A

[0234] As a result of comparing the obtained subtraction value with the third reference value, if the vehicle determines that the obtained subtraction value is less than or equal to the third reference value, the vehicle obtains a final weight by subtracting a second predetermined ratio of the set value (A) from the current weight, and updates the current weight with the obtained final weight (214).

[0235] Here, the second predetermined ratio may be a ratio of 1 times.

[0236] Final weight = current weight (factor) - 1*A

[0237] like Figure 6 As shown, the power limit value of battery 143 can be obtained based on the voltage deviation values of the plurality of battery cells and the degradation rate of battery 143. By supplying power to vehicle power system 140 and the vehicle's electronic devices based on the obtained power limit value of battery 143, it can be recognized that the minimum voltage value of the battery cells of battery 143 remains above 2.5V, which is the minimum usable voltage value of a conventional battery.

[0238] In this way, it is possible to prevent the battery 143 from being over-discharged at the minimum usable voltage value and shortening the battery's service life.

[0239] According to an exemplary embodiment of the present invention, a power limit value of a battery may be obtained in consideration of degradation of the battery, and a usage time of the battery may be adjusted.

[0240] According to an exemplary embodiment of the present invention, even if a battery is deteriorated, electric power can be output in a normal battery voltage use region, and thus, a vehicle can be stably controlled.

[0241] According to an exemplary embodiment of the present invention, it is possible to prevent battery degradation from accelerating by preventing the voltage of the battery from exceeding a normal voltage range.

[0242] According to an exemplary embodiment of the present invention, by adjusting the power limit value based on the voltage deviation values and weights of a plurality of battery cells, it is possible to prevent the battery from being over-discharged at an available minimum voltage value and shortening the battery's service life.

[0243] As described above, the present invention can prevent battery damage due to low battery voltage, and can improve the marketability of hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV) that can be driven by batteries and electric motors, further improve user satisfaction, and ensure product competitiveness.

[0244] The disclosed embodiments may be implemented in the form of a recording medium storing computer-executable instructions that can be executed by a processor. The instructions may be stored in the form of program code, and when executed by the processor, the instructions may generate a program module to perform the operations of the disclosed embodiments. The recording medium may be non-transitory and implemented as a computer-readable recording medium.

[0245] The non-transitory computer-readable recording medium may include all kinds of recording media that store commands that can be interpreted by a computer. For example, the non-transitory computer-readable recording medium may be a ROM, RAM, magnetic tape, magnetic disk, flash memory, optical data storage device, etc.

[0246] Thus far, the embodiments of the present invention have been described with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be implemented in other forms than the above-described embodiments without changing the technical concept or basic features of the present invention. The above embodiments are merely exemplary and should not be interpreted in a limiting sense.

Claims

1. A battery management device, comprising: a battery having a plurality of battery cells; a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information regarding the detected voltage values; a storage device configured to store a first map in which power limit values corresponding to voltage deviation values are matched; as well as A management controller, wherein the management controller is configured to: identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells, obtaining a voltage deviation value between the maximum voltage value and the minimum voltage value, obtaining a first power limit value of the battery corresponding to the voltage deviation value based on the first mapping, and Discharging of the battery is controlled based on a first power limit value of the battery.

2. The battery management device according to claim 1, further comprising: A communication device is configured to transmit the first power limit value of the battery to a vehicle controller in response to a control command of the management controller.

3. The battery management device according to claim 1, wherein: When the voltage deviation value exceeds a first reference value, the management controller is further configured to obtain a first final power limit value based on a first power limit value of the battery and a preset weight.

4. The battery management device according to claim 3, wherein: When controlling the discharge of the battery based on the first final power limit value, the management controller is further configured to: identifying a minimum voltage value among the voltage values of the plurality of battery cells, and When the minimum voltage value is less than a second reference value, the preset weight is updated.

5. The battery management device according to claim 4, wherein: When updating the preset weight, the management controller is further configured to: updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtraction value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and When the subtracted value is less than or equal to the third reference value, the preset weight is updated based on the set value and a second predetermined ratio.

6. The battery management device according to claim 1, wherein: The storage device is further configured to store a second map in which power limit values respectively corresponding to degradation rates of the batteries are matched; and The management controller is further configured to: When the voltage deviation value is less than or equal to a first reference value, obtaining the degradation rate of the battery, When the degradation rate of the battery exceeds a reference degradation rate, obtaining a second power limit value corresponding to the degradation rate of the battery based on the second map, and A second final power limit value is obtained based on the second power limit value and a preset weight.

7. The battery management device according to claim 6, wherein: When controlling the discharge of the battery based on the second final power limit, the management controller is further configured to: identifying a minimum voltage value among the voltage values of the plurality of battery cells, and When the minimum voltage value is less than a second reference value, the preset weight is updated.

8. The battery management device according to claim 7, wherein: When updating the preset weight, the management controller is further configured to: updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtraction value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and When the subtracted value is less than or equal to the third reference value, the preset weight is updated based on the set value and a second predetermined ratio.

9. The battery management device according to claim 6, wherein: The storage device is further configured to store a third map in which power limit values respectively corresponding to voltage values of the batteries are matched; as well as When the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, the degradation rate being less than or equal to the reference degradation rate is determined to be a normal state of the battery, and the management controller is further configured to: obtaining a third power limit value corresponding to a normal state of the battery based on the third map, and A third final power limit value is obtained based on the third power limit value and the preset weight.

10. The battery management device according to claim 9, wherein: When controlling the discharge of the battery based on the third final power limit value, the management controller is further configured to: identifying a minimum voltage value among the voltage values of the plurality of battery cells, and When the identified minimum voltage value is less than the second reference value, the preset weight is updated. The battery management device according to claim 10 , wherein: When updating the preset weight, the management controller is further configured to: updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtraction value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and When the subtracted value is less than or equal to the third reference value, the preset weight is updated based on the set value and a second predetermined ratio.

12. The battery management device according to claim 6, wherein: When the degradation rate of the battery exceeds the reference degradation rate, the management controller is further configured to: obtaining an output reduction time corresponding to a degradation rate of the battery, obtaining a current output available time of the battery based on a reference output available time and the output reduction time, and Discharging of the battery is controlled based on the current output available time.

13. A vehicle comprising: wheels, the wheels using at least one of the power of the electric motor and the power of the engine as a driving force; a battery having a plurality of battery cells and configured to supply power to the electric motor; a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information regarding the detected voltage values; a storage device configured to store a first map in which power limit values corresponding to voltage deviation values are matched; A battery management device comprising a processor, the processor being configured to: identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells, obtaining a voltage deviation value between the maximum voltage value and the minimum voltage value and a first power limit value of the battery corresponding to the voltage deviation value based on the first mapping; and When the voltage deviation value exceeds a first reference value, obtaining a first final power limit value based on a first power limit value of the battery and a preset weight; as well as A controller is configured to control operation of at least one of the electric motor, the battery, and the engine, and to control discharge of the battery based on the first final power limit value obtained from the battery management device.

14. The vehicle of claim 13, wherein: The storage device is further configured to store a second map in which power limit values respectively corresponding to degradation rates of the batteries are matched; and The processor of the battery management device is further configured to: When the voltage deviation value is less than or equal to a first reference value, obtaining the degradation rate of the battery, When the degradation rate of the battery exceeds a reference degradation rate, obtaining a second power limit value corresponding to the degradation rate of the battery based on the second map, and A second final power limit value is obtained based on the second power limit value and the preset weight.

15. The vehicle of claim 14, wherein: The storage device is further configured to store a third map in which power limit values respectively corresponding to voltage values of the batteries are matched; as well as When the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, the degradation rate being less than or equal to the reference degradation rate is determined to be a normal state of the battery, and the processor of the battery management device is further configured to: obtaining a third power limit value corresponding to a normal state of the battery based on the third map, and A third final power limit value is obtained based on the third power limit value and the preset weight.

16. The vehicle of claim 15, wherein: When controlling the discharge of the battery, the processor of the battery management device is further configured to: identifying a minimum voltage value among the voltage values of the plurality of battery cells, and When the identified minimum voltage value is less than the second reference value, the preset weight is updated.

17. The vehicle of claim 16, wherein: When updating the preset weight, the processor of the battery management device is further configured to: updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtraction value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and When the subtracted value is less than or equal to the third reference value, the preset weight is updated based on the set value and a second predetermined ratio.

18. The vehicle of claim 14, wherein: When the degradation rate of the battery exceeds the reference degradation rate, the processor of the battery management device is further configured to obtain an output reduction time corresponding to the degradation rate of the battery, to obtain a current output available time of the battery based on the reference output available time and the output reduction time, and to transmit the current output available time to the controller.

19. A method of controlling a vehicle, the vehicle comprising an electric motor, an engine, and a battery, the method comprising: detecting respective voltage values of a plurality of battery cells disposed in the battery; identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells; Obtaining a voltage deviation value between the maximum voltage value and the minimum voltage value; obtaining a degradation rate of the battery; obtaining a power limit value of the battery based on at least one of a voltage deviation value and a degradation rate of the battery; Obtaining a final power limit value based on the power limit value and a preset weight; as well as Discharging of the battery is controlled based on the final power limit value.

20. The method according to claim 19, wherein Obtaining the power limit value of the battery includes: when the voltage deviation value exceeds a first reference value, obtaining the power limit value based on a first mapping to which a power limit value corresponding to the voltage deviation value is matched; when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery exceeds a reference degradation rate, obtaining the power limit value based on a second map in which power limit values respectively corresponding to the degradation rates of the batteries are matched; and When the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, the power limit value is obtained based on a third map to which power limit values respectively corresponding to the voltage values of the battery are matched.

21. The method of claim 19, further comprising: When controlling discharge of the battery, a minimum voltage value is identified among voltage values of the plurality of battery cells, and the preset weight is updated when the identified minimum voltage value is less than a second reference value.

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