CN-122008864-A - Electric vehicle

Abstract

In the electric vehicle of the present invention, in executing normal running control in which the first and second inverters are controlled so that the series relay is turned on and running is performed using electric power from the first and second batteries, when an open abnormality occurs in the series relay, avoidance running control is executed in which one of the first and second parallel relays is turned on and the first and second inverters are controlled so that running is performed using electric power from the battery whose power storage ratio is equal to or greater than a threshold value.

Inventors

• Hiroshima Hiroshima
• Zao Chuan Yu is wished

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20251021

Priority Date

20241112

Claims (3)

1. 1. An electric vehicle, characterized in that, The electric vehicle includes: A battery system includes a first battery including a first positive electrode side terminal and a first negative electrode side terminal connected to a positive electrode side line, a second battery including a second positive electrode side terminal and a second negative electrode side terminal connected to a negative electrode side line, a series line connected to the first negative electrode side terminal and the second positive electrode side terminal, a first parallel line connected to the first negative electrode side terminal and the negative electrode side line, a second parallel line connected to the second positive electrode side terminal and the positive electrode side line, a series relay provided to the series line, a first parallel relay provided to the first parallel line, and a second parallel relay provided to the second parallel line; a motor for running having a 3-phase open-circuit winding; a first inverter connected to the positive electrode side wire and the negative electrode side wire and connected to one end side of the 3-phase open-circuit winding; A second inverter connected to the positive side line and the negative side line and connected to the other end side of the 3-phase open-circuit winding, and A control device that controls the series relay, the first parallel relay, the second parallel relay, the first inverter, and the second inverter, The control device is configured to control the first inverter and the second inverter so that the first and second inverters are driven by using electric power from the first and second batteries while the series relay is turned on, and to execute, when an open abnormality occurs in the series relay, a reverse drive control that turns on one of the first and second parallel relays and controls the first and second inverters so that the first and second inverters are driven by using electric power from one of the first and second batteries and a battery having a power storage ratio equal to or greater than a threshold value.
2. 2. The electric vehicle of claim 1, characterized in that, The control device is configured to control the avoidance travel, When the power storage ratio of the first battery is equal to or greater than a first threshold value, a first avoidance travel control is executed that turns on the first parallel relay and controls the first inverter and the second inverter so as to travel using electric power from the first battery, And executing a second avoidance travel control that turns on the second parallel relay and controls the first inverter and the second inverter so as to travel using electric power from the second battery when the electric power storage ratio of the first battery is smaller than the first threshold and the electric power storage ratio of the second battery is equal to or greater than a second threshold.
3. 3. The electric vehicle of claim 2, characterized in that, The battery system further has a positive electrode side relay provided between the first battery and the first inverter and the second inverter of the positive electrode side line, When the second avoidance travel control is executed, the control device turns off the positive-side relay.

Description

Electric vehicle Technical Field The present disclosure relates to an electric vehicle. Background Conventionally, an electric vehicle (ELECTRIFIED VEHICLE) has been proposed in which first and second power storage modules can be charged from an external charger of a power supply device via a power supply cable connected to a charging port (for example, refer to japanese patent application laid-open No. 2020-150618). The electric vehicle is provided with a series-parallel switching relay capable of switching the connection states of the first and second power storage modules in series and in parallel, in addition to the first and second power storage modules. The electric vehicle further includes a power converter that transmits and receives electric power between the first and second power storage modules. The electric vehicle further includes an in-vehicle control unit that executes a voltage equalization process for controlling the power converter so that a voltage difference between the first and second power storage modules becomes equal to or less than a threshold value before parallel switching of the first and second power storage modules. The in-vehicle control unit sets the on/off state of the series-parallel switching relay to a predetermined diagnosis mode, and diagnoses an abnormality of the series-parallel switching relay based on the detection value of the voltage detector that detects the voltage of the charging port. In addition to the electric vehicle having the above hardware configuration, an electric vehicle including a battery system and a motor for running having a 3-phase open-circuit winding has been proposed. The electric vehicle further includes a first inverter connected to the positive electrode side and the negative electrode side of the battery system and connected to one end side of the three-phase open-circuit winding. The electric vehicle further includes a second inverter connected to the positive electrode side wire and the negative electrode side wire and connected to the other end side of the three-phase open-circuit winding. In this electric vehicle, the battery system sometimes has a first battery having a first positive-side terminal and a first negative-side terminal connected to the positive-side line. The battery system sometimes also has a second battery having a second positive side terminal and a second negative side terminal connected to the negative side line. The battery system may further include a series wire connected to the first negative electrode side terminal and the second positive electrode side terminal. The battery system may further include a first parallel wire connected to the first negative electrode side terminal and the negative electrode side wire, and a second parallel wire connected to the second positive electrode side terminal and the positive electrode side wire. The battery system may further include a series relay provided in the series line, a first parallel relay provided in the first parallel line, and a second parallel relay provided in the second parallel line. In the electric vehicle in this case, when the series relay is turned on and the electric power from the first and second batteries is used for traveling, it is a problem how to perform avoidance traveling when an open abnormality occurs in the series relay. Disclosure of Invention The electric vehicle of the present disclosure is mainly intended to enable avoidance travel when an open abnormality occurs in a series relay. In order to achieve the above-described main object, the electric vehicle of the present disclosure adopts the following technical solutions. An electric vehicle of the present disclosure includes: A battery system includes a first battery including a first positive electrode side terminal and a first negative electrode side terminal connected to a positive electrode side line, a second battery including a second positive electrode side terminal and a second negative electrode side terminal connected to a negative electrode side line, a series line connected to the first negative electrode side terminal and the second positive electrode side terminal, a first parallel line connected to the first negative electrode side terminal and the negative electrode side line, a second parallel line connected to the second positive electrode side terminal and the positive electrode side line, a series relay provided to the series line, a first parallel relay provided to the first parallel line, and a second parallel relay provided to the second parallel line; a motor for running having a 3-phase open-circuit winding; a first inverter connected to the positive electrode side wire and the negative electrode side wire and connected to one end side of the 3-phase open-circuit winding; A second inverter connected to the positive side line and the negative side line and connected to the other end side of the 3-phase open-circuit winding, and A control device for controll