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Motor pulse current control method and device and electric vehicle

A pulse current and current technology, which is applied in battery/fuel cell control devices, electric vehicles, control devices, etc., can solve problems such as overcurrent of components, changes in the magnitude of pulse current, and burnt hardware, so as to ensure reliability and safety , the effect of stable heating rate

Active Publication Date: 2022-03-18
深蓝汽车科技有限公司
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Problems solved by technology

[0003] However, there are the following problems in the method of motor pulse current control: During the heating process, the internal resistance and dynamic voltage of the power battery will change with the change of temperature, battery SOC and other factors, which will lead to the formation of pulse current Changes, on the one hand, will affect the heating rate of the power battery, on the other hand, the increase in current may cause risks such as overcurrent of components and hardware burnout

Method used

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  • Motor pulse current control method and device and electric vehicle
  • Motor pulse current control method and device and electric vehicle

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Embodiment Construction

[0025] Such as figure 1 , an embodiment of the present invention provides a motor pulse heating current control method, wherein the method includes:

[0026] When it is determined that the power battery has a pulse heating demand, obtain the pulse heating current request value of the power battery and the current internal resistance R of the power battery, and then input the pulse current request value and the current internal resistance R of the power battery into the first preset calibration table Check the current intermediate parameters (such as Table 1).

[0027]

[0028] Table 1

[0029] Find the current terminal voltage U of the battery through the second preset calibration calibration table (such as Table 2) x The corresponding current coefficient α below.

[0030] u x (V)

α x

100 200 300 400 ……

[0031] Table 2

[0032] Then, the product of the current intermediate parameter and the current coefficient α is u...

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Abstract

The invention relates to a motor pulse current control method and device and an electric automobile, and the method comprises the steps: determining a current intermediate parameter based on a received pulse heating current request value of a power battery and an obtained current internal resistance of the power battery when it is determined that the power battery has a pulse heating demand, determining a current coefficient based on the obtained current terminal voltage of the power battery; determining a to-be-output shaft current of the motor based on the current intermediate parameter and the current coefficient; and controlling a motor to output according to the to-be-output shaft current.

Description

technical field [0001] The invention belongs to the technical field of power battery heating, and in particular relates to a motor pulse heating control method and device and an electric vehicle. Background technique [0002] The charging and discharging capacity of the power battery of an electric vehicle is limited in a low-temperature environment. In order to use the electric vehicle normally, it is necessary to quickly heat the power battery to a suitable working temperature. The method of motor pulse current control can form a high-frequency pulse current at both ends of the power battery, and then heat the power battery internally. This heating method can quickly heat the power battery. Compared with the traditional PTC heating technology, it has a greater Advantages: 1. High heating efficiency, battery heating efficiency is higher than PTC; 2. No need to add external hardware, thereby reducing heating costs. [0003] However, there are the following problems in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/27B60L58/10B60L15/20
CPCB60L58/27B60L58/10B60L15/20B60L2240/429Y02T10/70Y02T10/72
Inventor 向宇陈富彭钱磊陈健杜长虹邓承浩苏琳珂
Owner 深蓝汽车科技有限公司
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