WO2024071689A1

WO2024071689A1 - Power control system and method for electric vehicle operating multiple parallel battery banks, and method for charging auxiliary battery

Info

Publication number: WO2024071689A1
Application number: PCT/KR2023/012457
Authority: WO
Inventors: 노형태; 곽인재; 김상훈; 변세희; 이준우; 진실로; 김대우
Original assignee: 주식회사 현대케피코
Priority date: 2022-09-28
Filing date: 2023-08-23
Publication date: 2024-04-04
Also published as: KR20240044014A

Abstract

A power control system for an electric vehicle operating multiple parallel battery banks according to the present invention comprises: first/second battery banks which store driving power of the electric vehicle; a motor drive part which supplies the driving power to a travel motor; DC electric parts composed of direct current-driven electric devices for operating the electric vehicle; a first DC/DC converter which converts DC power supplied from the first battery bank into DC power suitable for the DC electric parts; a second DC/DC converter which converts DC power supplied from the second battery bank into DC power suitable for the DC electric parts; a first relay which switches the power supply paths of the first DC/DC converter and the DC electric parts; a second relay which switches the power supply paths of the second DC/DC converter and the DC electric parts; and an upper control part which, when the electric vehicle is in a key-on state, controls the corresponding power supply paths by designating the least worn down battery bank among the battery banks mounted on the electric vehicle as the first battery bank to be used for controlling the travel motor and the second least worn down battery bank as the second battery bank to be used for the DC electric parts.

Description

Power control system and method for electric vehicles operating multiple parallel battery banks, and auxiliary battery charging method

The present invention relates to a power control method for a small electric vehicle, especially an electric three-wheeled vehicle, that operates a swappable multi-battery parallel pack bank, and relates to a power control method for an electric vehicle and a system for performing the same.

In general, small electric vehicles such as electric three-wheelers are composed of a controller, motor, inverter, and high-voltage battery, and the driver's driving intention is calculated by the VCU controller and then motor torque is generated through the MCU controller.

The existing electric three-wheeled vehicle is the same as the electric two-wheeled vehicle system, but considering the vehicle weight and number of passengers, there is a disadvantage in that the driving distance is shorter compared to the battery capacity of the same class as the two-wheeled vehicle. Accordingly, there have been recent attempts to improve driving range by operating multiple parallel battery packs.

As a way to increase the remaining driving range in an electric three-wheeled vehicle, multiple parallel battery pack banks (basically 2 battery packs per bank) can be operated, and the remaining driving range can be increased by 1 by swapping the battery pack banks according to the driving situation. It can be increased compared to when using a bank.

Meanwhile, a typical electric three-wheeled vehicle uses a single source provided by a high-voltage battery pack to supply power for motor control for driving, vehicle electronics, and other sub-devices, so when sub-devices are added after shipment, the fuel cost due to the electrical load significantly increases. It could get worse.

The present invention provides a power control system and method for an electric vehicle that can maintain optimal battery status by selecting and swapping the bank to be used according to the performance status of each battery bank in an electric vehicle operating multiple parallel battery banks. We would like to provide

A power control system for an electric vehicle operating multiple parallel battery banks according to an aspect of the present invention includes a first battery bank and a second battery bank that store driving power of the electric vehicle; A motor drive unit that supplies driving power to a driving motor of an electric vehicle; DC electrical equipment unit consisting of direct current driven electrical equipment for operation of electric vehicles; A first DC/DC converter that converts DC power supplied from the first battery bank into DC power suitable for the DC electric unit; a second DC/DC converter that converts DC power supplied from the second battery bank into DC power suitable for the DC electric unit; A first relay for switching the power supply path of the first DC/DC converter and the DC electric unit; A second relay for switching the power supply path of the second DC/DC converter and the DC electric unit; And when the electric vehicle is keyed on, the one with the best state of durability (SOH) among the battery banks mounted on the electric vehicle is designated as the first battery bank to be used for driving motor control, and the next best battery bank is designated as the DC. It may designate the second battery bank to be used for the electrical equipment unit and include a higher-level control unit that controls the corresponding power supply path.

Here, the upper control unit applies the first battery bank used for driving motor control to supply current for motor control up to a predetermined reference SOC, and when the reference SOC is reached, the second battery bank and It can operate multiple parallel battery banks performing swaps.

Here, the upper control unit may operate multiple parallel battery banks that supply charging current due to regenerative braking to the first battery bank after swapping to use the second battery bank.

Here, when the electric vehicle is keyed on, if one of the first battery bank and the second battery bank falls short of a predetermined standard SOC, the upper control unit controls the remaining battery bank to control the driving motor and the It can be designated as a battery bank to be used in DC electrical parts.

Here, when the first battery bank falls below the standard SOC due to driving and the driver attempts to continue driving, the upper control unit exhausts the first battery bank through driving first, and then reorganizes the second battery bank. It is possible to operate multiple parallel battery banks performing swap.

Here, the power supply path of the DC electric unit may operate multiple parallel battery banks that supply driving power to auxiliary electronic devices of the electric vehicle.

Here, the first battery bank and the second battery bank include a plurality of unit battery cells; BMS that controls charging and discharging operation of the unit battery cells; And it may include a high-voltage output stage switch that switches to output the power discharged by the unit battery cells to an external path.

A power control method for an electric vehicle operating multiple parallel battery banks according to another aspect of the present invention includes the steps of checking the state of durability (SOH) among battery banks mounted on the electric vehicle when the electric vehicle is keyed on. ; A bank designation step of designating the one with the best state of durability (SOH) as the first battery bank to be used for driving the traveling motor, and designating the next best battery bank to be used in the DC electric unit as the second battery bank to be used in the DC electric unit; And if the state of charge of the first battery bank is below a reference state while the electric vehicle is operating, it may include performing swapping to the second battery bank.

Here, in the bank designation step, it is checked whether the deviation of the durability states of the battery banks falls within a predetermined similar range, and if it falls within the similar range, the battery bank with the highest amount of charge is designated as the first battery bank, and then Many battery banks can be designated as the second battery bank.

Here, performing the swap includes blocking the power supply path of the first battery bank and supplying power to be used in driving the travel motor and the DC electric unit from the second battery bank; and monitoring the charging state of the second battery bank.

Here, in the step of performing the swap, the first battery bank may be charged with the regenerative current of the motor of the electric vehicle.

Here, after performing the swap, if the charge state of the second battery bank is below the reference state, the step of performing swap with the first battery bank may be further included.

Here, the step of charging the auxiliary battery of the electric vehicle in the VCU sleep state of the electric vehicle may be further included.

An auxiliary battery charging method for an electric vehicle operating multiple parallel battery banks according to another aspect of the present invention includes waking up the electric vehicle from a VCU sleep state to periodically monitor whether the auxiliary battery is charging; Checking the state of durability (SOH) of battery banks mounted on the electric vehicle; Check whether the deviation of the durability states of the battery banks falls within a predetermined similar range. If it falls within a similar range, select the battery bank with the highest charge. If it does not fall within the similar range, select the battery bank with the best durability state. steps; and charging the auxiliary battery with power from a selected battery bank.

When the power control system and/or method for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention of the above-described configuration is implemented, the bank to be used is selected and swapped according to the performance state of each battery bank. This has the advantage of maintaining optimal battery condition.

A power control system and/or method for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention is a method for increasing the remaining driving distance in a relatively lightweight electric vehicle such as an electric three-wheeler, and includes a multiple parallel battery pack bank ( Basically, it is possible to operate 2 battery packs per bank, and by switching the battery pack banks according to the driving situation, there is an advantage of increasing the remaining driving range compared to using 1 bank.

Additionally, the power control system and/or method for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention includes a battery pack used only for motor control for driving in a vehicle system operating multiple parallel battery pack banks. The battery bank that supplies power to electrical components such as banks, lamps/electronic water pumps, and auxiliary equipment that drives the in-wheel motor mounted on the front wheel for torque assistance is determined according to the battery performance status and then used through swap. This has the advantage of maintaining optimal battery condition and improving vehicle performance.

1 is a block diagram illustrating an embodiment of a power control system for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention.

Figure 2 is a conceptual diagram of a power control method for multiple parallel battery banks when the SOH levels of each battery bank fall within a similar range.

Figure 3 is a conceptual diagram of a power control method for multiple parallel battery banks when there is a difference in SOH levels of each battery bank.

4 is a flowchart illustrating an embodiment of a power control method for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention.

Figure 5 is a flow chart illustrating the operating mechanism of each step in Figure 4 in more detail.

FIG. 6 is a flowchart showing detailed processes of the step (S600) of performing the failure mode of FIG. 5.

FIG. 7 is a flowchart illustrating an embodiment of an auxiliary battery charging method that can be performed in a power control system for an electric vehicle operating the multiple parallel battery banks of FIG. 1. FIG.

* Explanation of signs

110: first battery bank

120: second battery bank

160: motor driving unit

180: DC electric unit

190: Auxiliary electronic device

210: 1st DC/DC converter

220: 2nd DC/DC converter

230: 1st relay

240: 2nd relay

260: upper control unit

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. Terms are intended only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present invention.

When a component is mentioned as being connected or connected to another component, it can be understood that it may be directly connected to or connected to the other component, but other components may exist in between. .

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

In this specification, terms such as include or have are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, including one or more other features or numbers, It can be understood that the existence or addition possibility of steps, operations, components, parts, or combinations thereof is not excluded in advance.

Additionally, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

The power control system and method for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention is particularly useful when applied to an electric three-wheeled vehicle operating a swappable multiple parallel battery pack bank (1 bank is 2). In this case, in an electric three-wheeled vehicle operating multiple parallel packs, the battery pack status of each bank is checked and the superior battery pack bank is preferentially used for motor control for driving the vehicle, thereby saving energy. Efficiency can be maximized.

The illustrated power control system for an electric vehicle operating multiple parallel battery banks includes a first battery bank 110 and a second battery bank 120 that store driving power of the electric vehicle; A motor drive unit 160 that supplies driving power to a driving motor of an electric vehicle; A DC electrical unit 180 consisting of direct current driven electrical devices for operating an electric vehicle; A first DC/DC converter 210 that converts DC power supplied from the first battery bank 110 into DC power suitable for the DC electrical unit 180; A second DC/DC converter 220 that converts DC power supplied from the second battery bank 120 into DC power suitable for the DC electrical unit 180; A first relay 230 that switches the power supply path of the first DC/DC converter 210 and the DC electric unit 180; A second relay 240 that switches the power supply path of the second DC/DC converter 220 and the DC electrical unit 180; And when the electric vehicle is keyed on, the one with the best state of durability (SOH) among the battery banks mounted on the electric vehicle is designated as the first battery bank 110 to be used for driving motor control, and the next best battery bank 110 is designated as the first battery bank 110 to be used for driving motor control. It may include an upper control unit 260 that controls the power supply path by designating it as the second battery bank 120 to be used for the DC electrical unit.

SOH can be applied as the durability state of each battery bank, and a specific example will be provided by applying SOC as the charging state of each battery bank, which will be described later.

Although not shown, it may further include a sensor that determines whether the first/

second battery banks

110 and 120 are installed and a sensor that determines the driver's (user's) intention to swap the battery banks.

Depending on implementation, the upper control unit 260 may be the highest control unit of an electric vehicle and applies the battery bank used for driving motor control to set a predetermined standard SOC (default, battery manufacturer setting value, driver charging notification setting) It supplies current for motor control up to the applicable value, etc.), and can perform swap with another battery bank at the above standard SOC.

In the illustrated configuration, the auxiliary electronic device 190 of the electric vehicle is also shown, and it can be seen that the power supply path of the DC electric unit 180 also supplies driving power to the auxiliary electronic device 190. That is, the DC electrical unit 180 and the auxiliary electronic device 190 can form a single set and receive driving power.

Checking the SOH of each battery bank when turning on the vehicle can be performed by applying various known technologies. For example, the SOH can be calculated by analyzing the charge/discharge current-voltage pattern of each battery bank at a previous point in time according to a predetermined algorithm.

Each of the illustrated first battery bank 110 and the second battery bank 120 includes a plurality of unit battery cells; BMS that controls charging and discharging operation of the unit battery cells; And it may include a high-voltage output switch (FET) that switches the power discharged by the unit battery cells to be output to an external path.

In the power control system for an electric vehicle operating multiple parallel battery banks, the high voltage output of the first and

second battery banks

110 and 120 generates output DC inside each

battery bank

110 and 120 and While the path is turned on/off using the high-voltage output stage switch (FET) provided in Output DC is generated and the path is turned on/off using separately provided first and

second relays

230 and 240.

This strengthens the protection of the motor drive path of the battery bank, and replaces the first and second DC/

DC converters

210 and 220 for the power specifications of the auxiliary electronic device 190 that can be provided by a 3rd party as well. This method has the advantage of being able to provide flexible support. Additionally, the method of allocating a dedicated DC/DC converter to each battery bank has the advantage of improving the speed of the swap operation described above and enhancing stability during swap.

Meanwhile, the charging paths of the first battery bank 110 and the second battery bank 120 may be provided in parallel separately from the discharging paths so that each bank can perform discharging and charging simultaneously.

Figure 2 illustrates the concept of a power control method for multiple parallel battery banks when the SOH levels of each battery bank fall within a similar range.

In Figure 2, the first 1st/2nd battery bank configuration is a process of checking and selecting the battery pack status for each bank at Key On, the 2nd configuration is a battery pack bank swap request process, and the 3rd configuration is attempting to continue driving when charging is required. The fourth configuration shows the process of using a city bank, and the process of sequentially depleting SOC for each bank.

Figure 3 illustrates the concept of a power control method for multiple parallel battery banks when differences exist in the SOH levels of each battery bank.

In Figure 3, the first 1st/2nd battery bank configuration is a process of checking and selecting the battery pack status for each bank upon key-on, the second configuration is a process of requesting a battery pack bank swap, and the third configuration is attempting to continue driving when charging is required. The fourth configuration shows the process of using a city bank, and the process of sequentially depleting SOC for each bank.

In the case of Figure 2, the SOH levels of the battery banks are similar as a result of the inspection when turning on the key, so the one with the highest SOC as the charge amount is designated as the first battery bank to supply power for motor control, and the other one is supplied with DC to the second battery bank. Provides power for ledgers and auxiliary electronic devices.

On the other hand, in the case of Figure 3, there is a significant difference in the SOH levels of the battery banks as a result of the inspection when turning on the key, so the one with the highest SOH is designated as the first battery bank regardless of the amount of charge to supply power for motor control, and the other battery bank is designated as the first battery bank. The second battery bank supplies power for the DC electrical and auxiliary electronic devices. At this time, the SOC of the first battery bank may be lower than the SOC of the second battery bank, but it must be sufficiently higher than the standard SOC.

It can be seen that, except for the designation process of the first battery bank described above, the subsequent processes in FIGS. 2 and 3 are identical to each other.

In the subsequent process after designation of the first battery bank, it can be seen from FIGS. 2 and 3 that after swapping to use the second battery bank, charging current due to regenerative braking is supplied to the first battery bank. In other words, the charging current due to regenerative braking is configured to only flow into a battery bank with excellent performance.

Figure 4 is a flowchart illustrating an embodiment of a power control method for an electric vehicle operating multiple parallel battery banks according to the spirit of the present invention.

The power control method for an electric vehicle operating multiple parallel battery banks includes the steps of checking the state of durability (SOH) among battery banks mounted on the electric vehicle when the electric vehicle is keyed on (S100); A bank designation step (S200) in which the one with the best durability (SOH) is designated as the first battery bank to be used for driving the traveling motor, and the next best battery bank is designated as the second battery bank to be used in the DC electric unit; And if the state of charge of the first battery bank is less than the reference state while the electric vehicle is operating (S300), it may include performing a swap with the second battery bank (S400).

In the bank designation step (S200), it is checked whether the deviation of the endurance states of the battery banks falls within a predetermined similar range, and if it does not fall within the similar range, the first/second battery banks are in the endurance state according to the SOH as described above. is designated, and if it falls within a similar range, the battery bank with the largest amount of charge is designated as the first battery bank, and the battery bank with the next largest amount of charge is designated as the second battery bank.

Figure 5 is a flowchart illustrating the operating mechanism of each step in Figure 4 in more detail.

In step S200 of FIG. 4, in FIG. 5, it is a step of checking whether the deviation of the SOH of the battery banks falls within a predetermined similar range (S210). If it falls within a similar range, the SOCs of the first and second battery banks are compared. Step (S220); Designating a battery bank with a high SOC (i.e., the highest amount of charge) as the first battery bank, and designating the next largest battery bank as the second battery bank (S260, S270); If the deviation of the SOH does not fall within a similar range, it is subdivided into a step (S230) of designating the one with the high SOH as the first battery bank to be used for driving the traveling motor, and then designating the second battery bank to be used for the DC electric unit.

In step S200 of FIG. 4, in FIG. 5, when the electric vehicle is keyed on, if one of the first battery bank and the second battery bank falls short of a predetermined standard SOC, the remaining battery banks are used to control the driving motor and Steps (S240, S250, S280, S290) to designate as a battery bank to be used in DC electrical equipment are being performed.

Step S300 of FIG. 4 includes, in FIG. 5, using the current of the first/second battery bank while driving (S320); Monitoring whether each of the first and second battery banks has a failure (S340); and performing a failure mode when a failure occurs (S600).

In the case of FIG. 5, step S300 of FIG. 4 is a step (S360) of comparing the SOC of the battery bank used for driving motor control with a predetermined reference SOC (applicable as default, battery manufacturer setting value, driver charging notification setting value, etc.) ), and if it falls below the reference SOC, a step (S410) of first swapping the battery bank used for driving motor control with the second battery bank is performed.

The first swapping step (S410) can be performed in the same manner as the second configuration of FIGS. 2 and 3. That is, the swapped second battery bank is designated and operated as a battery bank to be used for controlling the driving motor and the DC electrical equipment.

From the above-described point of view, the step of performing the swap (S400) of FIG. 4 blocks the power supply path of the first battery bank, and transfers power to be used for driving the traveling motor and the DC electrical unit from the second battery bank. Supply step (S410); and monitoring the charging state of the second battery bank (S420).

Although not shown in a flow chart, in the swap performing step (S400) and thereafter, the first battery bank may be charged with the regenerative current of the motor of the electric vehicle.

Even after the first swapping step (S410), using the power of the first/second battery bank with the swapped designation (S410); Comparing the SOC of the battery bank in power use with the reference SOC (S430); If the SOC falls below the standard SOC, a second swapping step (S440) of the battery bank used for controlling the driving motor with the first battery bank may be performed. The second swap (S400) is performed in the same manner as the third configuration in FIGS. 2 and 3. Afterwards, the driver's driving intention is confirmed (S450), and the first battery bank is fully charged from the reference SOC. It is used until discharged (0%) (S460).

In step S450, the driver is notified that the battery charge is low, and if there is no intention to drive, the driver can end driving or physically replace the battery bank at the driver's option (S455).

After the secondary swapping step (S440), when the first battery bank that has been secondary swapped and is being used for driving is fully discharged (0%) (S460), a third swap is performed again with the second battery bank ( S470), the second battery bank is used from the reference SOC until it is fully discharged (0%) (S480).

In FIG. 6, after performing the diagnosis of the fault state for each battery bank (S610), similar to after the first swap step (S410) of FIG. 5, one normal battery bank is used to control the driving motor and supply all power to the DC electrical equipment ( S620).

During subsequent driving, as shown in FIG. 5, if the SOC of the normal battery bank falls below the standard SOC (S630), a series of processes (S650, S655, S680) to confirm the driver's driving intention are performed, and the driving intention is confirmed. Accordingly, the normal battery bank is used until it is fully discharged (0%) (S680).

Meanwhile, in the case of an electric vehicle (electric three-wheeler) equipped with an in-wheel motor, if it falls below the standard SOC (S630), the in-wheel motor is immediately stopped from use, or a series of processes are performed to confirm the driver's intention to use the in-wheel motor. (S660, S664) can be performed.

In this case, the first and second battery banks that supply power to not only electrical components such as lamps/electronic water pumps but also auxiliary equipment that drives the in-wheel motor mounted on the front wheel for torque assistance are determined according to the battery performance status. By using the post-swap method, you can improve vehicle performance by maintaining optimal battery condition.

FIG. 7 is a flowchart illustrating an embodiment of an auxiliary battery charging method that can be performed in a power control system for an electric vehicle operating the multiple parallel battery banks of FIG. 1.

The illustrated auxiliary battery charging method may be initiated by checking the voltage while the upper control unit periodically wakes up after sleeping due to reasons such as an operation stoppage. In the flowchart shown, the VCU may be the upper control unit 260 of FIG. 1.

The illustrated method of charging an auxiliary battery for an electric vehicle operating multiple parallel battery banks includes waking up the electric vehicle from a VCU sleep state (S710) to periodically monitor whether the auxiliary battery is charging (S720);

If charging of the auxiliary battery is necessary (S730), checking the state of durability (SOH) of the battery banks mounted on the electric vehicle (S800);

Check whether the deviation of the durability states of the battery banks falls within a predetermined equal range (S830), and if it falls within the equal range, select the battery bank with the highest amount of charge (SOC) (S840, S850), and if it does not fall within the equal range, select the battery bank with the highest amount of charge (SOC). Otherwise, the method may include selecting a battery bank with the best state of durability (SOH) (S860, S870) and charging the auxiliary battery with the power of the selected battery bank (S855, S880).

In addition, if both the first battery bank and the second battery bank fall short of the predetermined standard SOC (S810), it is confirmed that the auxiliary battery cannot be charged (S820), and the need for high-voltage charging can be notified to the driver (S825). .

After charging the auxiliary battery with the power of the selected battery bank (S855, S880), when completion of charging of the auxiliary battery is confirmed (S885), the VCU of the electric vehicle enters SLEEP mode (S890).

Those skilled in the art to which the present invention pertains should understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features, and that the embodiments described above are illustrative in all respects and not restrictive. Just do it. The scope of the present invention is indicated by the claims described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

The present invention can maximize fuel efficiency by checking the battery pack status for each bank in an electric vehicle operating multiple parallel packs and preferentially using the superior battery pack bank for motor control for vehicle driving.

Claims

A first battery bank and a second battery bank that store driving power of the electric vehicle;

A motor drive unit that supplies driving power to a driving motor of an electric vehicle;

DC electrical equipment unit consisting of direct current driven electrical equipment for operation of electric vehicles;

A first DC/DC converter that converts DC power supplied from the first battery bank into DC power suitable for the DC electrical equipment;

a second DC/DC converter that converts DC power supplied from the second battery bank into DC power suitable for the DC electric unit;

A first relay for switching the power supply path of the first DC/DC converter and the DC electric unit;

A second relay for switching the power supply path of the second DC/DC converter and the DC electric unit; and

When the electric vehicle is keyed on, the one with the best state of durability (SOH) among the battery banks mounted on the electric vehicle is designated as the first battery bank to be used for driving motor control, and the next best battery bank is used as the DC power bank. A higher-level control unit that controls the power supply path by designating it as the second battery bank to be used in the ledger.

A power control system for an electric vehicle operating multiple parallel battery banks including.
According to paragraph 1,

The upper control unit is,

A multi-parallel battery bank that applies the first battery bank used for driving motor control to supply current for motor control up to a predetermined reference SOC and performs swap with the second battery bank when the reference SOC is reached. A power control system for electric vehicles that operate.
According to paragraph 2,

The upper control unit is,

A power control system for an electric vehicle operating multiple parallel battery banks that supplies charging current from regenerative braking to the first battery bank after swapping the second battery bank for use.
According to paragraph 2,

The upper control unit is,

When the electric vehicle is keyed on, if one of the first battery bank and the second battery bank falls short of a predetermined standard SOC, the remaining battery bank is used as a battery bank to be used for controlling the driving motor and the DC electrical unit. Power control system for electric vehicles operating multiple parallel battery banks that specify
According to paragraph 2,

The upper control unit is,

When the first battery bank drops below the standard SOC during driving and the driver attempts to continue driving, the first battery bank is exhausted first through driving and then swapped to the second battery bank. Power control system for electric vehicles operating banks.
According to paragraph 1,

The power supply path of the DC electric unit is,

A power control system for electric vehicles operating multiple parallel battery banks that supply drive power to the electric vehicle's auxiliary electronics.
According to paragraph 1,

The first battery bank and the second battery bank,

A plurality of unit battery cells;

BMS that controls charging and discharging operation of the unit battery cells; and

A high-voltage output stage switch that switches to output the power discharged by the unit battery cells to an external path.

A power control system for an electric vehicle operating multiple parallel battery banks including.
Checking the state of durability (SOH) among battery banks mounted on the electric vehicle when the electric vehicle is keyed on;

A bank designation step in which the one with the best state of durability (SOH) is designated as the first battery bank to be used for driving the traveling motor, and the next best battery bank is designated as the second battery bank to be used in the DC electric unit; and

If the state of charge of the first battery bank is below the reference state while the electric vehicle is operating, performing swap to the second battery bank.

Power control method for an electric vehicle operating multiple parallel battery banks including.
According to clause 8,

In the bank designation step,

Check whether the deviation of the durability states of the battery banks falls within a predetermined similar range, and if it falls within the similar range, designate the battery bank with the largest amount of charge as the first battery bank, and designate the battery bank with the largest amount of charge as the second battery bank. Power control method for electric vehicles operating multiple parallel battery banks, designated as battery banks.
According to clause 8,

The steps for performing the swap are:

blocking the power supply path of the first battery bank, and supplying power to be used in driving the travel motor and the DC electric unit from the second battery bank; and

Monitoring the state of charge of the second battery bank

Power control method for an electric vehicle operating multiple parallel battery banks including.
According to clause 10,

In the step of performing the swap,

A power control method for an electric vehicle operating multiple parallel battery banks that charges the first battery bank with regenerative current from a motor of the electric vehicle.
According to clause 10,

After performing the swap,

If the state of charge of the second battery bank is below the reference state, performing swap with the first battery bank.

A power control method for an electric vehicle operating multiple parallel battery banks, further comprising:
According to clause 8,

Charging the auxiliary battery of the electric vehicle in a VCU sleep state of the electric vehicle

A power control method for an electric vehicle operating multiple parallel battery banks, further comprising:
Waking up the VCU of the electric vehicle from a sleep state to periodically monitor whether the auxiliary battery is charging;

Checking the state of durability (SOH) of battery banks mounted on the electric vehicle;

Check whether the deviation of the durability states of the battery banks falls within a predetermined similar range. If it falls within a similar range, select the battery bank with the highest charge. If it does not fall within the similar range, select the battery bank with the best durability state. steps; and

Charging the auxiliary battery with power from the selected battery bank.

A method of charging an auxiliary battery for an electric vehicle operating multiple parallel battery banks including.