CN-117002329-B - Battery self-heating system, method and vehicle

CN117002329BCN 117002329 BCN117002329 BCN 117002329BCN-117002329-B

Abstract

The disclosure relates to a battery self-heating system, a method and a vehicle, which belong to the field of battery management, wherein the battery self-heating system comprises an inverter, a multiphase motor, a switch module, a control module and a battery pack; the control module is electrically connected with the battery pack, the inverter, the multi-phase motor and the switch module, the battery pack, the switch module, the inverter and the multi-phase motor form a self-heating loop, the switch module can be selectively turned on or off the self-heating loop, and the control module can be used for selectively turning on or off the self-heating loop in the parking, charging or driving process of the vehicle by controlling the working state of the inverter and the working state of the switch module.

Inventors

LING HEPING
PAN HUA
LI JICHENG
ZHANG YUXIN
CHEN WENYONG

Assignees

比亚迪股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220429

Claims (10)

1. The battery self-heating system is characterized by comprising an inverter, a multiphase motor, a switch module, a control module and a battery pack, wherein the battery pack comprises a first battery pack and a second battery pack, the multiphase motor is connected to a series connection point of the first battery pack and the second battery pack through a neutral line, and the switch module is arranged on the neutral line; the control module is electrically connected with the inverter and the switch module, the switch module comprises a first switch branch and a third contactor, the first switch branch comprises a first power switch device, a second power switch device and a first contactor, the first power switch device is connected with the second power switch device in series in an anti-series manner and then is connected with the first contactor in series, the first switch branch is connected with the third contactor in parallel, and the overcurrent capacity of the contactor in the first switch branch is smaller than that of the third contactor; The battery pack, the switch module, the inverter and the multiphase motor form a self-heating loop, wherein the switch module can selectively switch on or off the self-heating loop; The control module is configured to control the working state of the inverter and control the working state of the switch module, so that the switch module can selectively turn on or off the self-heating loop in a vehicle driving process, where in the vehicle driving process, the control module is configured to control the switch module to turn on or off, and the control module includes: The method comprises the steps of controlling a contactor in a first switch branch to be attracted under the condition of switching from a self-heating state to a non-self-heating state, controlling a power switch device in the first switch branch to be simultaneously turned on after the contactor in the first switch branch is attracted and when the current of a neutral line is in a zero crossing state, controlling a third contactor to be turned off after the power switch device in the first switch branch is all turned on, controlling the power switch device in the first switch branch to be simultaneously turned off after the third contactor is turned off and when the current of the neutral line is in the zero crossing state, controlling the contactor in the first switch branch to be turned off after the power switch device in the first switch branch is all turned off, keeping all devices in a switch module in a non-self-heating process, and controlling the on time of the power switch device in the switch module to be less than 50ms under the condition of switching from the self-heating state to the non-self-heating state.
2. The system of claim 1, wherein the system further comprises a controller configured to control the controller, The control module is used for controlling the contactor in the first switch branch to be attracted under the condition of switching from a non-self-heating state to a self-heating state, controlling the power switch devices in the first switch branch to be simultaneously on after the contactor in the first switch branch is attracted, controlling the third contactor to be attracted after the power switch devices in the first switch branch are all on, controlling the power switch devices in the switch module to be simultaneously off after the third contactor is attracted, controlling the contactor in the first switch branch to be turned off after the power switch devices in the first switch branch are all off, and keeping the third contactor in an on state during self-heating, wherein the power switch devices in the first switch branch are in an off state, and the contactor in the first switch branch is in an off state.
3. The system of claim 2, wherein a turn-on duration of a power switch device in the switch module is less than 50ms in the case of switching from a non-self-heating state to a self-heating state.
4. A system according to claim 2 or 3, wherein, The control module is used for controlling the power switching device in the switching module to be switched on or off when the current of the neutral line crosses zero under the condition of switching from a non-self-heating state to a self-heating state.
5. The battery self-heating system is characterized by comprising an inverter, a multiphase motor, a switch module, a control module and a battery pack, wherein the battery pack comprises a first battery pack and a second battery pack, the multiphase motor is connected to a series connection point of the first battery pack and the second battery pack through a neutral line, and the switch module is arranged on the neutral line; The control module is electrically connected with the inverter and the switch module, the switch module comprises a first switch branch and a third contactor, the first switch branch comprises a first power switch device, a second power switch device and a first contactor, the first power switch device is connected in series with the first contactor after being connected in reverse parallel with the second power switch device, the first switch branch is connected in parallel with the third contactor, and the overcurrent capacity of the contactor in the first switch branch is smaller than that of the third contactor; The battery pack, the switch module, the inverter and the multiphase motor form a self-heating loop, wherein the switch module can selectively switch on or off the self-heating loop; The control module is configured to control the working state of the inverter and control the working state of the switch module, so that the switch module can selectively turn on or off the self-heating loop in a vehicle driving process, where in the vehicle driving process, the control module is configured to control the switch module to turn on or off, and the control module includes: The method comprises the steps of controlling a contactor in a first switch branch to be attracted under the condition of switching from a self-heating state to a non-self-heating state, controlling a power switch device in the first switch branch to be simultaneously turned on after the contactor in the first switch branch is attracted and when the current of a neutral line is in a zero crossing state, controlling a third contactor to be turned off after the power switch device in the first switch branch is all turned on, controlling the power switch device in the first switch branch to be simultaneously turned off after the third contactor is turned off and when the current of the neutral line is in the zero crossing state, controlling the contactor in the first switch branch to be turned off after the power switch device in the first switch branch is all turned off, keeping all devices in a switch module in a non-self-heating process, and controlling the on time of the power switch device in the switch module to be less than 50ms under the condition of switching from the self-heating state to the non-self-heating state.
6. The system of claim 5, wherein the system further comprises a controller configured to control the controller, The control module is used for controlling the contactor in the first switch branch to be attracted under the condition of switching from a non-self-heating state to a self-heating state, controlling the power switch devices in the first switch branch to be simultaneously on after the contactor in the first switch branch is attracted, controlling the third contactor to be attracted after the power switch devices in the first switch branch are all on, controlling the power switch devices in the switch module to be simultaneously off after the third contactor is attracted, controlling the contactor in the first switch branch to be turned off after the power switch devices in the first switch branch are all off, and keeping the third contactor in an on state during self-heating, wherein the power switch devices in the first switch branch are in an off state, and the contactor in the first switch branch is in an off state.
7. The system of claim 6, wherein a turn-on duration of a power switch device in the switch module is less than 50ms in the case of switching from a non-self-heating state to a self-heating state.
8. The system of claim 6 or 7, wherein the system comprises a plurality of sensors, The control module is used for controlling the power switching device in the switching module to be switched on or off when the current of the neutral line crosses zero under the condition of switching from a non-self-heating state to a self-heating state.
9. A battery self-heating method, characterized by being applied to the battery self-heating system as claimed in claim 1 or 5, comprising: The working state of the inverter and the working state of the switch module are controlled, so that the switch module can selectively turn on or off the self-heating loop in the driving process of a vehicle; the switching module is arranged on a neutral line of the multiphase motor, the multiphase motor is connected to a series connection point of the first battery pack and the second battery pack through the neutral line, the switching module comprises a first switching branch and a third contactor, the first switching branch comprises a first power switching device, a second power switching device and a first contactor, the first power switching device is connected in series with the first contactor in series with the second power switching device in reverse connection or in parallel with the second power switching device in a reverse connection mode, the first switching branch is connected with the third contactor in parallel, the overcurrent capacity of the contactor in the first switching branch is smaller than the overcurrent capacity of the third contactor, in the vehicle driving process, the switching module is controlled to be turned on or off, the switching module is controlled to be turned on under the condition that the switching state is switched from a self-heating state to a non-self-heating state, after the first switching branch is sucked in, the first switching device is controlled to be turned off under the condition that the neutral line is connected in parallel with the first switching device in series with the first switching branch, the switching device is controlled to be turned off under the condition that the first switching device is switched on and the first switching device is switched off under the condition that the switching device is switched off under the zero-heating state in the first switching branch is switched on the first switching branch, and the first switching device is controlled to be turned off under the condition that the switching device is switched on the first switching device is switched off in the first switching branch is connected to be connected to the first switching device in the first switching branch in the first branch in a zero-state in a reverse connection mode, the method comprises the steps of controlling a contactor in a first switch branch to be turned off, keeping all devices in a switch module in an off state in a non-self-heating process, and enabling the on-time of a power switch device in the switch module to be less than 50ms under the condition of switching from a self-heating state to a non-self-heating state.
10. A vehicle comprising a battery self-heating system as claimed in any one of claims 1 to 8.

Description

Battery self-heating system, method and vehicle Technical Field The present disclosure relates to the field of battery management, and in particular, to a battery self-heating system, a method, and a vehicle. Background With development and rapid popularization of electric vehicles, a power battery based on lithium ions is widely applied, and due to inherent characteristics of the battery, the battery is charged and discharged at a proper temperature, so that the charging and discharging efficiency of the battery can be improved, the service life of the battery is prolonged, and the charging and discharging capacity of the battery at a low temperature can be greatly reduced, which affects the use of the electric vehicle in cold areas. In the related art, self-heating by using a power battery is proposed, however, in the related art, self-heating can only be realized in a stopped state, self-heating cannot be realized in a driving process, and system efficiency and battery performance cannot be improved to the maximum extent. Disclosure of Invention In order to solve the problems in the related art, the present disclosure provides a battery self-heating system, a method, and a vehicle. In order to achieve the above object, according to a first aspect of the present disclosure, there is provided a battery self-heating system including an inverter, a multi-phase motor, a switching module, a control module, and a battery pack; the control module is electrically connected with the inverter and the switch module; The battery pack, the switch module, the inverter and the multiphase motor form a self-heating loop, wherein the switch module can selectively switch on or off the self-heating loop; The control module is used for controlling the working state of the inverter and the working state of the switch module so that the switch module can selectively turn on or off the self-heating loop. Optionally, the switching module includes a first switching leg including a first power switching device, a second power switching device, and a first contactor; the first power switch device is connected in series with the first contactor after being connected in reverse series with the second power switch device; the control module is used for controlling the first contactor to be attracted under the condition of switching from a non-self-heating state to a self-heating state, and controlling the first power switch device and the second power switch device to be simultaneously turned on after the first contactor is attracted; And under the condition that the self-heating state is switched to the non-self-heating state, the first power switch device and the second power switch device are controlled to be turned off, under the condition that the first power switch device and the second power switch device are turned off, the first contactor is controlled to be turned off, and the first contactor, the first power switch device and the second power switch device are kept in the off state in the non-self-heating process. Optionally, the switching module includes a second switching branch including a third power switching device and a fourth power switching device, the third power switching device being in reverse series with the fourth power switching device; the control module is used for controlling the third power switch device and the fourth power switch device to be simultaneously turned on under the condition of switching from a non-self-heating state to a self-heating state; And under the condition of switching from a non-self-heating state to a self-heating state, controlling the third power switching device and the fourth power switching device to be simultaneously turned off, and keeping the third power switching device and the fourth power switching device in an off state in the non-self-heating process. Optionally, the switching module includes a first switching branch, where the first switching branch includes a fifth power switching device, a sixth power switching device, and a second contactor, and the fifth power switching device is connected in series with the second contactor after being connected in anti-parallel with the sixth power switching device; The control module is used for controlling the second contactor to be attracted under the condition of switching from a non-self-heating state to a self-heating state, and controlling the fifth power switch device and the sixth power switch device to be simultaneously turned on after the second contactor is attracted; And under the condition that the self-heating state is switched to the non-self-heating state, the fifth power switch device and the sixth power switch device are controlled to be simultaneously turned off, under the condition that the fifth power switch device and the sixth power switch device are turned off, the second contactor is controlled to be turned off, and the second contactor, the fifth power switch device and the sixth power switch device a