Vehicle and power battery heating device and method thereof

A technology of power battery and heating method, which is applied in the field of vehicles and can solve problems such as vehicle shaking

Active Publication Date: 2020-06-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a vehicle and its power battery heating device and method to solve the problem that the power battery heating method easily causes the vehicle to shake

Method used

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  • Vehicle and power battery heating device and method thereof
  • Vehicle and power battery heating device and method thereof
  • Vehicle and power battery heating device and method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] Further, as an implementation manner of the present application, the power battery heating method further includes:

[0036] Acquire gear position information and motor speed information, and acquire the current working state of the motor according to the gear position information and the motor speed information.

[0037] Specifically, when it is determined that the current gear is P and the vehicle speed is 0, it indicates that the current working state of the motor is non-driving; when it is determined that the current gear is not P or the vehicle speed is not zero, it indicates that the motor is The current working state is the driving state.

[0038] In this embodiment, the gear position information and the motor speed information are acquired, and the current working state of the motor is obtained according to the gear position information and the motor speed information, so that when determining whether the power battery meets the heating condition according to the worki...

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Abstract

The application provides a vehicle and a power battery heating device and method thereof. According to the power battery heating method, when the current temperature value of a power battery is lowerthan a preset temperature value and the heating condition of the power battery meets a preset condition, a three-phase inverter is controlled to enable a three-phase alternating current motor to generate heat according to the heating energy so as to heat cooling liquid flowing through the power battery; a preset quadrature-axis current enabling the torque value output by the motor to be at a proper value is obtained; a corresponding preset direct-axis current according to the heating power of the power battery is obtained; in the heating process, the three-phase inverter is controlled to adjust the phase current of the three-phase alternating current motor according to the preset direct-axis current and the preset quadrature-axis current, so that the motor shaft outputs an electromagnetictorque that has a very small torque value, cannot enable a vehicle to move, does not damage the parts of a vehicle transmission mechanism and only the motor output shaft outputs a pre-tightening forceto the transmission mechanism to eliminate meshing clearances, and thus the vehicle is effectively prevented from shaking.

Description

Technical field [0001] This application relates to the field of vehicle technology, and in particular to a vehicle and its power battery heating device and method. Background technique [0002] In recent years, the vigorous development of new energy vehicles has led to a large number of applications of lithium-ion-based power batteries. Due to the inherent characteristics of batteries, the charging and discharging capabilities of power batteries will be greatly reduced at low temperatures, which will affect the use of vehicles in cold regions. [0003] To solve this problem, the prior art mainly obtains the temperature of the power battery in real time through a temperature sensor, and uses the energy provided by the power battery to control the zero-torque operation of the motor when the temperature of the power battery meets preset conditions, so as to realize the power battery heating . However, although this method can achieve power battery heating, it needs to control the mot...

Claims

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Application Information

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IPC IPC(8): B60L58/27
CPCB60L58/27Y02T10/70B60L2240/545B60L3/0046B60L3/0061B60L3/0084B60L15/025B60L58/34H01M10/486H01M10/615H01M10/625H01M10/633H01M10/6571H01M10/425H01M2010/4271H01M2220/20H01M10/613H01M10/6568Y02E60/10Y02T10/64Y02T10/7072Y02T90/14Y02T90/40
Inventor 廉玉波凌和平潘华张宇昕陈昊
Owner BYD CO LTD
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