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A dual-source battery pack switching method and system
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A technology for switching systems and battery packs, applied in battery/battery traction, battery/fuel cell control devices, charging stations, etc. The effect of increasing the output current and increasing the required power
Active Publication Date: 2021-05-28
HUNAN UNIV
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Problems solved by technology
[0003] The present invention provides a dual-source battery pack switching method and system to solve the problem that the dual-source battery pack switching is easy to generate circulating current without a DC / DC converter
Method used
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Embodiment 1
[0086] This embodiment provides a dual-source battery pack switching method, including:
[0087] Obtain the first terminal voltage of the currently used battery pack and the second terminal voltage of the battery pack to be switched in real time;
[0088] During normal driving:
[0089] Switching method 1, if the difference between the first terminal voltage and the second terminal voltage is within the first preset range, the battery pack will be directly
[0090] switch;
[0091] If the difference between the voltage at the first terminal and the voltage at the second terminal exceeds the first preset range, it includes:
[0092] Switching method 2, if the voltage at the second terminal is lower than the voltage at the first terminal, adjust the output vectors of the iq axis and the id axis of the vehicle motor, so that the efficiency of the vehicle motor is reduced and the output torque and speed remain unchanged, so that the first terminal of the currently used battery p...
Embodiment 2
[0120] This embodiment provides a dual-source battery pack switching system, such as figure 1 As shown, it includes a battery information collection module, a vehicle controller 3, a motor controller (MCU) 4, and a switch module, and the battery information collection module, the motor controller 4, and the switch module are all connected to the vehicle controller 3 ;
[0121] The battery information collection module is used to obtain the first terminal voltage of the currently used battery pack and the second terminal voltage of the battery pack to be switched and send them to the vehicle controller 3;
[0122] The vehicle controller 3 is used to perform the following operations:
[0123] During normal driving:
[0124] Switching mode 1, if the difference between the received first terminal voltage and the second terminal voltage is within the first preset range, send an instruction to the switch module to directly switch the battery pack;
[0125] If the difference betwe...
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Abstract
The invention discloses a dual-source battery pack switching method and system, wherein the method includes: obtaining in real time the first terminal voltage of the currently used battery pack and the second terminal voltage of the battery pack to be switched; during normal driving: if the first If the difference between the voltage at the second terminal and the voltage at the second terminal is within the first preset range, then switch the battery pack directly; otherwise, it includes: if the voltage at the second terminal is lower than the voltage at the first terminal, then adjust the output vector of the vehicle motor so that the first The terminal voltage decreases. When it is detected that the difference between the reduced first terminal voltage and the second terminal voltage is within the first preset range, the battery pack is switched; if the second terminal voltage is greater than the first terminal voltage, the battery pack is reduced. The output power of the vehicle motor or the braking of the motor is controlled to increase the voltage at the first terminal. When it is detected that the difference between the increased voltage at the first terminal and the voltage at the second terminal is within the first preset range, the battery pack is switched . It is possible to avoid or reduce the generation of circulating current during battery pack switching without the need for a DC / DC converter.
Description
technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a dual-source battery pack switching method and system. Background technique [0002] The current dual-source battery pack control and switching technology usually requires a bidirectional DC / DC converter in order to solve the problem of voltage differences between the two battery packs; for example, Chinese patent 2019101086642 discloses a dual-battery pack power supply device and its The control method, including the first battery pack, the second battery pack, a DCDC circuit (equivalent to a DC / DC converter) and a motor controller, needs to rely on the DCDC circuit to adjust the output voltages of the first battery pack and the second battery pack to be consistent to switch. If there is no DC / DC converter, the battery pack is switched directly. When the output voltages of the two battery packs are different, the battery pack with high voltage will charge the batte...
Claims
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Application Information
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