A vehicle and its power battery heating device and method

A power battery and heating method technology, which is applied in the field of vehicles, can solve the problems of uneven life of power switching devices, and achieve the effect of uniform switching times and balanced device life

Active Publication Date: 2021-07-09
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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  • A vehicle and its power battery heating device and method
  • A vehicle and its power battery heating device and method
  • A vehicle and its power battery heating device and method

Examples

Experimental program
Comparison scheme
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

This application proposes a vehicle and its power battery heating device and method. The power battery heating method controls three The phase inverter makes the three-phase AC motor generate heat according to the heating energy to heat the coolant flowing through the power battery, and obtains the torque value output by the motor at an appropriate value to preset the quadrature axis current, and obtains according to the heating power of the power battery The corresponding preset direct-axis current, and then control the three-phase inverter to adjust the phase current of the three-phase AC motor according to the preset direct-axis current and preset quadrature-axis current during the heating process, and preset the direction of the direct-axis current It changes periodically during the heating process, so that the switching times of the upper and lower bridge arms of the power switching device of the same phase are even, and the life of the device 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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Patent Type & Authority Patents(China)
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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