Minimum monomer voltage-based electric vehicle discharge protection method

A single voltage, electric vehicle technology, applied in electric vehicles, battery/fuel cell control devices, vehicle components, etc., can solve the problems of low-voltage protection of power batteries, impact on battery safety and life, and inability to protect batteries, so as to protect batteries , to prevent damage, to avoid the effect of over-discharge

Active Publication Date: 2018-05-08
XIAN TGOOD INTELLIGENT CHARGING TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0003] At present, when electric vehicles are discharged through the charging interface through the discharge equipment, the BMS does not provide information on the voltage of the battery cells to the discharge equipment, so the discharge equipment cannot perform traditional low-voltage p

Method used

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  • Minimum monomer voltage-based electric vehicle discharge protection method

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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] like figure 1 As shown, taking lithium iron phosphate as an example, the electric vehicle and the discharge device are ready for physical connection and parameter configuration, the electric vehicle starts to discharge, and the discharge protection is carried out as follows:

[0041] S1: The discharge device interacts with the BMS of the electric vehicle; this step S1 includes judging the type of the discharged battery. In this embodiment, the discharge device determines that the type of the discharged battery is lithium iron phosphate. In this embodiment, the lithium iron phosphate battery The lower limit value of the monomer voltage V1=2.75~2.95V, the comparative value of the monomer voltage V2=2.96~3.06V;

[0042] S2: The electric vehicle is discharged through the discharge equipment;

[0043] S3: Judging that SOC≤D 1 , in this examp...

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Abstract

The invention discloses a minimum monomer voltage-based electric vehicle discharge protection method. During a battery discharge process, battery SOC and monomer voltage are determined; when the battery SOC is lower than a preset SOC lower limiting value or the minimum monomer voltage of the battery is lower than a lower limiting value of the monomer voltage, battery discharge is terminated. During the discharge process, SOC works as judgment condition; under a specific condition, discharge of the electric vehicle by discharge equipment is paused, and a minimum value of the power battery monomer voltage can be acquired; discharge of the electric vehicle can be protected according to dual judgment conditions of the SOC and the minimum monomer voltage value, so the battery can be effectivelyprotected; excessive discharge of the battery can be avoided; meanwhile, much electricity can be discharged by the electric vehicle; and electric vehicle energy storage efficiency failure due to excessive protection can be prevented.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle discharge, and in particular relates to an electric vehicle discharge protection method based on the minimum single voltage. Background technique [0002] The rapid development of electric vehicles has brought about major changes in the automotive industry, and has also brought a new operating model to the energy storage industry. Electric vehicles use the on-board power battery system as the energy source for vehicle power, which itself is a new form of energy storage—mobile energy storage. During the discharge process of electric vehicles, whether it will cause damage to personal safety, vehicle safety, and equipment safety is the focus of vehicle users and charging and discharging equipment operators. The discharge process of the power battery is a process in which chemical energy is converted into electrical energy. When an electric vehicle is discharged to the outside, it is necessa...

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Application Information

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IPC IPC(8): B60L11/18
CPCB60L58/10B60L58/12Y02T10/70
Inventor 陈凤琴黄炎刘琪
Owner XIAN TGOOD INTELLIGENT CHARGING TECH CO LTD
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