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Electric vehicle and battery heating method and system thereof

A battery heating system, electric vehicle technology, applied in electric vehicles, secondary batteries, circuits, etc., can solve problems such as low heating efficiency

Inactive Publication Date: 2017-05-03
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low heating efficiency of the power battery heating method and system in the prior art, thereby providing an electric vehicle and its battery heating method and system

Method used

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  • Electric vehicle and battery heating method and system thereof
  • Electric vehicle and battery heating method and system thereof
  • Electric vehicle and battery heating method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] like figure 1 As shown, this embodiment provides a battery heating method for an electric vehicle, which may include the following steps:

[0040] S1: Get the temperature of the battery. The battery management system can collect the temperature of the battery through a temperature sensor arranged in the battery box.

[0041]S2: Determine whether the temperature is lower than the first temperature threshold, if yes, execute step S3, if no, do not execute the operation, that is, it is not necessary to start the self-heating operation on the battery. The first temperature threshold refers to the minimum temperature limit suitable for battery operation, below the limit, the battery needs to be heated, and above the limit, the battery can be directly started without heating the battery. It is similar to traditional fuel vehicles that need to be warmed up in advance in order to improve the performance of the engine when the temperature is low.

[0042] S3: Get the remainin...

Embodiment 2

[0051] like figure 2 As shown, this embodiment provides a battery heating system for an electric vehicle, including:

[0052] The battery management device 1 is used for obtaining the temperature of the battery and judging whether the temperature is lower than the first temperature threshold, if the temperature is lower than the first temperature threshold, obtaining the remaining power of the battery and judging whether the remaining power is greater than the power threshold, if the remaining power is greater than the electric power threshold, the motor control device 3 is controlled to issue a charging control signal, the battery is discharged for a first preset time, and the energy is stored in the energy storage device 2; then the motor control device 3 is controlled to issue a discharge control signal to The battery is charged for a second preset time, and the charged energy is derived from the energy stored in the energy storage device 2; the battery is discharged and c...

Embodiment 3

[0058] like image 3 As shown, this embodiment provides a battery heating system for an electric vehicle, including:

[0059] The battery management device 1 is used to obtain whether the temperature of the battery is lower than the first temperature threshold. If the temperature is lower than the first temperature threshold, obtain the remaining power of the battery and judge whether the remaining power is greater than the power threshold. If the remaining power is greater than the power threshold, Then control the active equalization device 5 to discharge the battery for the first preset time, and store the energy in the energy storage unit of the active equalization device 5; then control the active equalization device 5 to charge the battery for the second preset time, and charge The energy of the battery is derived from the energy stored in the energy storage unit; the battery is cycled to discharge and charge until the temperature of the battery reaches the second temper...

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Abstract

The invention provides a battery heating method and a system of an electric vehicle. The battery heating method comprises the steps of: obtaining the temperature of a battery; judging if the temperature is lower than a first temperature threshold; if so, obtaining a remainder electric quantity of the battery and judging if the remainder electric quantity is higher than an electric quantity threshold; if so, discharging the battery by a first preset time, and storing energy in an energy storage device; then, using the energy storage device for charging the battery by a second preset time; and circulating the step until the temperature of the battery reaches a second temperature threshold. The method and the system uses self-heating characteristic of the battery in the charge / discharge process for heating the battery from inside to outside; compared with a method for heating the battery by external heating equipment in the prior art, the battery heating method is more balanced in heating, and facilitates prolonging of the service life of the battery; and the heat is from the internal of the battery, so that the heating efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an electric vehicle and a battery heating method and system thereof. Background technique [0002] Since electric vehicles have less impact on the environment than traditional vehicles, they are widely regarded as one of the main ways to solve problems such as vehicle exhaust pollution and oil energy shortages, and are the current development trend of the automotive industry. As an energy source for electric vehicles, power batteries need to work within a reasonable temperature range. According to the characteristics of the battery, when the temperature is low, the charging and discharging performance of the battery decreases, and it cannot continuously provide a large output power, which will lead to poor power performance of the vehicle. [0003] In order to improve the performance of the power battery, the temperature of the battery needs to be raised to a suitable ...

Claims

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Application Information

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IPC IPC(8): B60L11/18H01M10/615H01M10/625H01M10/633
CPCY02E60/10Y02T10/70
Inventor 闫丽娟赵祥日
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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