Electric automobile and power battery heating system and heating method thereof
A power battery and heating method technology, applied in the direction of electric vehicles, motor generator control, control systems, etc., can solve problems such as slowing down the pulse current generation speed, unexpected driving or shaking of the vehicle, and unstable three-phase current feedback , to achieve the effect of increasing heating speed, small fluctuation, and avoiding unexpected driving or shaking
Active Publication Date: 2021-06-22
重庆长安新能源汽车科技有限公司
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Problems solved by technology
However, the current passing through the three-phase AC motor is DC current, and this phase current regulation method is not suitable for pulse heating (that is, it is not suitable for the scheme where the current passing through the three-phase AC motor is pulse current)
Because, if this phase current adjustment method is used in pulse heating, in addition to the preset direct-axis current Id and the preset quadrature-axis current Iq, a three-phase AC is required when calculating th
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[0039] The present invention will be described in detail below with reference to the accompanying drawings.
[0040] Such as Figures 1 to 7 As shown, the power battery heating method in this embodiment, the motor system employed includes the motor controller 41 and the three-phase motor 42, the three-phase motor 42 is a three-phase three-wire electric machine, and the motor controller 41 includes a control module. , Three-phase bridge arm and bus capacitance C, three-phase bridge arms are connected in parallel by U-phase bridge arm, V-phase bridge arm and W-phase bridge arm, bus capacitance C and U-phase bridge arm, V-phase bridge arm, W photo bridge arm in parallel. The U-phase bridge arm is connected by the upper bridge arm power switch S1 and the lower bridge arm power switch S4, and the V-phase bridge arm is connected by the upper bridge arm power switch S2 and the lower bridge arm power switch S5, and the W phase bridge arm is from the upper bridge arm. Power switch S3 and th...
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The invention discloses an electric vehicle and a power battery heating system and method, and the method comprises the steps: enabling a motor system to enter a pulse heating mode when a pulse heating entering condition is met, carrying out the pulse heating of a power battery, and enabling a cooling liquid absorbing the heat of the motor system to enter a cooling pipeline of the power battery to heat the power battery; when the pulse heating quit condition is met, enabling the motor system to quit the pulse heating mode, stopping pulse heating of the power battery, and enabling the cooling liquid in the cooling pipeline of the power battery to stop flowing; in a pulse heating mode, enabling quadrature-axis voltage to be equal to zero, adjusting the magnitude of pulse current by controlling direct-axis voltage, generating actual pulse width modulation signals of the six power switches by superposing pulse signals. Three-phase current feedback quantity is not needed, the output pulse current is stable and small in fluctuation, the pulse heating effect of the power battery can be improved, and unexpected driving or shaking of a vehicle in the pulse heating process of the power battery is avoided.
Description
technical field [0001] The invention belongs to the technical field of power battery heating, and in particular relates to an electric vehicle and its power battery heating system and heating method. Background technique [0002] With the vigorous development of the new energy vehicle industry, the application scenarios of electric vehicles are becoming more and more extensive. In order to adapt to different usage environments, it is necessary to ensure the normal function and performance of electric vehicles in various extreme environments. However, under extremely cold conditions, due to the inherent characteristics of power batteries, their low-temperature charge and discharge capabilities will be greatly reduced, which will greatly limit the use of electric vehicles in low-temperature environments. [0003] In order to solve the above problems, it is necessary to heat the power battery in a low temperature environment. In the prior art, there are mainly two methods for h...
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Login to view more IPC IPC(8): B60L58/27B60L3/00H01M10/615H01M10/625H01M10/633H01M10/635H01M10/6571H01M10/6567H02J7/00H02P21/00H02P27/08
CPCB60L58/27B60L3/0023H01M10/615H01M10/625H01M10/633H01M10/635H01M10/6571H01M10/6567H02J7/0048H02J7/007194H02P21/00H02P27/08Y02T10/64Y02T10/70Y02E60/10
Inventor 陈富彭钱磊杜长虹陈健刘立邓承浩栾文悦邓鹏
Owner 重庆长安新能源汽车科技有限公司
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