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Vehicle and power battery heating device and method thereof

A technology of power battery and heating method, applied in the field of vehicles, can solve the problem of uneven life of power switching devices

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 existing power battery heating method easily leads to uneven service life of power switching devices in the upper and lower bridge arms of the same phase

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
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Effect test

Embodiment approach

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

[0036] Acquiring gear position information and motor speed information, and obtaining 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 position is the P gear and the vehicle speed is 0, it indicates that the current working state of the motor is a non-driving state; when it is determined that the current gear position is not the P gear or the vehicle speed is not zero, it indicates that the motor's The current working state is the driving state.

[0038]In this embodiment, by acquiring gear position information and motor speed information, and obtaining the current working state of the motor according to the gear position information and motor speed information, so that when judging whether the power battery meets the heating conditio...

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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 conforms to a preset condition, a three-phase inverter is controlled to enable a three-phase alternating current motor togenerate 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 aproper value is obtained; a corresponding preset direct-axis current is obtained according to the heating power of the power battery; in the heating process, the three-phase inverter is controlled toadjust the phase current of the three-phase alternating current motor according to the preset direct-axis current and the preset quadrature-axis current, and the direction of the preset direct-axis current changes periodically in the heating process, so that the switching times of upper and lower bridge arms of the power switching device of the same phase are uniform, and the service life of thedevice is balanced.

Description

technical field [0001] The present application relates to the technical field of vehicles, in particular to a heating device and method for a vehicle and its power battery. 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] In order to solve this problem, the existing technology mainly obtains the temperature of the power battery in real time through a temperature sensor, and when the temperature of the power battery meets the preset conditions, uses the energy provided by the power battery to control the motor to run at zero torque, so as to realize the heating of the power battery . However, although this method can realize power batt...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/625H01M10/48H01M10/635H01M10/6567B60L58/34
CPCH01M10/615H01M10/625H01M10/486H01M10/635H01M10/6567H01M10/48B60L58/27Y02T90/40Y02T10/70Y02E60/10Y02T10/72H01M2220/20H01M10/633H01M10/667H01M10/6568B60L15/025B60L15/20B60L2210/42B60L2210/44B60L2240/421B60L2240/423B60L2240/425B60L2240/429B60L2240/525B60L2240/529B60L2240/545B60L2240/662B60L2240/80B60L2260/22H02P25/20H02P29/62H02P29/024H02P29/66Y02T10/64Y02T90/16H01M10/613H01M10/663H02J7/007194H02J7/0047
Inventor 凌和平潘华张宇昕田果谢朝
Owner BYD CO LTD
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