CN-122008957-A - Drive control apparatus and method for electric vehicle

Abstract

The present disclosure provides a drive control apparatus and method for an electric vehicle. The electric vehicle uses a battery pack including battery cells as a power source in a battery management system, and the method may include receiving a first ignition signal, activating an emergency running mode, and discharging the battery pack by setting a discharge voltage of the battery pack to a first discharge voltage in the emergency running mode, the first discharge voltage being lower than a normal discharge voltage of a normal running mode.

Inventors

• Jin Zaiming

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260512

Application Date

20251112

Priority Date

20241112

Claims (18)

1. 1. A method for controlling an electric vehicle that uses a battery pack including battery cells as a power source, the method comprising: receiving a first ignition signal; Activating a first discharge voltage mode based on the first ignition signal; Setting a discharge voltage of the battery pack in the first discharge voltage mode to a first discharge voltage lower than a normal discharge voltage of a normal running mode, and The battery pack is discharged based on the first discharge voltage.
2. 2. The method of claim 1, wherein discharging the battery pack comprises: Connecting the battery pack to an inverter of the electric vehicle; controlling discharge of the battery pack based on the first discharge voltage, and The cumulative number of operations of the first discharge voltage mode is increased.
3. 3. The method of claim 2, further comprising determining whether the cumulative number of operations of the first discharge voltage mode is less than a first number; wherein the step of setting the discharge voltage of the battery pack in the first discharge voltage mode includes: when the accumulated number of operations of the first discharge voltage mode is smaller than the first number of times, a discharge voltage of the battery pack in the first discharge voltage mode is set to the first discharge voltage.
4. 4. The method of claim 3, further comprising indicating that the battery pack is depleted when the cumulative number of operations of the first discharge voltage mode is greater than or equal to the first number.
5. 5. The method of claim 1, the method further comprising: receiving a second ignition signal while the battery pack is not being charged after discharging the battery pack based on the first discharge voltage; Activating a second discharge voltage mode based on the second ignition signal; setting a discharge voltage of the battery pack in the second discharge mode to a second discharge voltage lower than the first discharge voltage, and The battery pack is discharged based on the second discharge voltage.
6. 6. The method of claim 5, further comprising determining whether the cumulative number of operations of the first discharge voltage mode is less than a first number; wherein the step of setting the discharge voltage of the battery pack in the first discharge voltage mode includes: when the accumulated number of operations of the first discharge voltage mode is smaller than the first number of times, a discharge voltage of the battery pack in the first discharge voltage mode is set to the first discharge voltage.
7. 7. The method of claim 6, further comprising determining whether the cumulative number of operations of the second discharge voltage mode is less than a second number; Wherein the step of setting the discharge voltage of the battery pack in the second discharge mode includes: when the accumulated number of operations of the second discharge voltage mode is smaller than the second number of times, a discharge voltage of the battery pack in the second discharge voltage mode is set to the second discharge voltage.
8. 8. The method of claim 7, wherein the second number of times is less than the first number of times.
9. 9. The method of claim 1, wherein the anode of the battery cell comprises a mixture of graphite and silicon as an anode active material.
10. 10. The method of claim 1, wherein activating the first discharge voltage mode comprises: the first discharge voltage mode is activated when the remaining capacity of the battery pack is below a predetermined threshold.
11. 11. An apparatus for controlling driving of an electric vehicle using a battery pack including battery cells as a power source, the apparatus comprising: A communication circuit configured to receive the first ignition signal, and A control circuit configured to activate a first discharge voltage mode in which the battery pack is connected to an inverter of the electric vehicle, set a discharge voltage of the battery pack in the first discharge voltage mode to a first discharge voltage, and discharge the battery pack based on the first discharge voltage, the first discharge voltage being lower than a normal discharge voltage of a normal running mode.
12. 12. The apparatus of claim 11, wherein the control circuit is configured to determine an accumulated number of operations of the first discharge voltage mode and operate in the first discharge voltage mode when the accumulated number of operations is less than a first number.
13. 13. The device according to claim 11, Wherein the communication circuit is further configured to receive a second ignition signal while the battery pack is not being charged after the control circuit discharges the battery pack based on the first discharge voltage, and Wherein the control circuit is configured to set a discharge voltage of the battery pack in a second discharge mode to a second discharge voltage, and to discharge the battery pack based on the second discharge voltage, the second discharge voltage being lower than the first discharge voltage.
14. 14. The apparatus of claim 13, wherein the control circuit is configured to determine whether an accumulated number of operations of the first discharge voltage mode is less than a first number of times, and to set a discharge voltage of the battery pack in the first discharge voltage mode to a first discharge voltage that is lower than a normal discharge voltage when the accumulated number of operations of the first discharge voltage mode is less than the first number of times.
15. 15. The apparatus of claim 14, wherein the control circuit is configured to determine whether the cumulative number of operations of the second discharge voltage mode is less than a second number of times, and to set the discharge voltage of the battery pack in the second discharge voltage mode to the second discharge voltage when the cumulative number of operations of the second discharge voltage mode is less than the second number of times.
16. 16. The apparatus of claim 15, wherein the second number is less than the first number.
17. 17. The apparatus of claim 11, wherein the control circuit is further configured to activate a first discharge voltage mode when a remaining capacity of the battery pack is below a predetermined threshold.
18. 18. The device of claim 11, wherein the anode of the battery cell comprises a mixture of graphite and silicon as an anode active material.

Description

Drive control apparatus and method for electric vehicle Technical Field The present disclosure relates to a drive control apparatus and method for an electric vehicle. Background Electric vehicles are driven using electric motors. An electric vehicle drives an electric motor using a battery pack as a high-voltage power source. A battery pack is a device that stores electric energy to supply electric power suitable for an electric vehicle. Since the performance of the battery pack will continue to deteriorate if the battery pack is fully discharged, the battery pack of the electric vehicle is controlled to prevent the battery pack from being fully discharged. However, a situation may occur in which the voltage of the battery pack of the electric vehicle is discharged to the discharge end voltage. In this case, a dedicated battery charger may be used to charge the battery pack, but if there is no dedicated battery charger, there is no solution. Disclosure of Invention One or more embodiments provide a driving control apparatus and method for an electric vehicle capable of controlling driving of the electric vehicle in an emergency mode in which traveling of the electric vehicle becomes difficult due to discharge of a battery pack to a discharge end voltage. According to one or more embodiments, a method for controlling an electric vehicle using a battery pack including battery cells as a power source in a battery management system includes receiving a first ignition signal, activating an limp-home running mode, and discharging the battery pack by setting a discharge voltage of the battery pack in the limp-home running mode to a first discharge voltage lower than a normal discharge voltage of a normal running mode. The discharging of the battery pack may include connecting the battery pack to an inverter of the electric vehicle, controlling the discharging of the battery pack based on the first discharging voltage, and increasing the accumulated number of operations of the limp-home running mode. The method may further include determining whether the accumulated number of limp-home mode of operation is less than the first number. The method may further include indicating that the battery pack is depleted when the cumulative number of times the limp-home mode of operation is greater than or equal to the first number of times. Discharging the battery pack may include controlling discharge of the battery pack in a first discharge voltage mode in which the discharge voltage includes a first discharge voltage, and controlling discharge of the battery pack in a second discharge voltage mode in which the discharge voltage includes a second discharge voltage, the second discharge voltage being lower than the first discharge voltage. Controlling the battery pack to discharge in the second discharge voltage mode may include determining that the second ignition signal is received when the battery pack is not being charged. Controlling the discharge of the battery pack in the first discharge voltage mode may include determining whether an accumulated number of operations of the first discharge voltage mode is less than a first number of times, wherein controlling the discharge of the battery pack in the second discharge voltage mode includes determining whether an accumulated number of operations of the second discharge voltage mode is less than a second number of times. The second number of times may be less than the first number of times. The anode of the battery cell may include a mixture of graphite and silicon as an anode active material. The method may further include operating in the limp home mode when the remaining capacity of the battery pack is low. According to one or more other embodiments, an apparatus for controlling driving of an electric vehicle using a battery pack including battery cells as a power source includes a communication circuit configured to receive a first ignition signal, and a control circuit configured to determine that an limp-home running mode is activated in response to the first ignition signal, connect the battery pack to an inverter of the electric vehicle in the limp-home running mode, set a discharge voltage of the battery pack to be lower than a normal discharge voltage of a normal running mode, and discharge the battery pack. The control circuit may be configured to determine an accumulated number of operations of the limp-home running mode and operate in the limp-home running mode when the accumulated number of operations is less than the first number. The limp-home mode may include a first discharge voltage mode in which the discharge voltage includes a first discharge voltage lower than the normal discharge voltage, and a second discharge voltage mode in which the discharge voltage includes a second discharge voltage lower than the first discharge voltage, wherein the control circuit is configured to default to the first discharge voltage mode instead of the second discharge v