Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

SOC estimation method and device for power battery of electric vehicle

A technology for power batteries and electric vehicles, which is applied in the directions of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of large SOC estimation error, and achieve the effect of accurate estimation

Inactive Publication Date: 2020-01-10
HENAN SENYUAN HEAVY IND
View PDF14 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for estimating the SOC of a power battery of an electric vehicle to solve the problem of large SOC estimation error caused by using the nominal capacity instead of the maximum capacity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • SOC estimation method and device for power battery of electric vehicle
  • SOC estimation method and device for power battery of electric vehicle
  • SOC estimation method and device for power battery of electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047]In order to realize accurate estimation of the SOC of the electric vehicle power battery, the present invention provides a device for estimating the SOC of the electric vehicle power battery. The method will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] The principle of this method is explained and illustrated in detail below, and the steps are as follows:

[0049] 1. Definition of battery state of charge

[0050] SOC end =Q rem / Q max =SOC ini +ΔQ / Q max (1)

[0051] Among them, SOC ini is the state of charge at the initial moment, SOC end is the state of charge at the current moment, ΔQ is the capacity change of the power battery from the initial moment to the current moment, Q max is the maximum capacity of the power battery.

[0052] It can be seen from the formula (1) that to realize the state of charge SOC at the current moment end The parameters that need to be determined include the capacit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an SOC (state of charge) estimation method and device for a power battery of an electric vehicle. The method comprises a step of obtaining the state of charge of the power battery at an initial moment when the power battery is charged or discharged, a step of calculating the capacity variation of the power battery from the initial moment to a current moment, a step of taking an actual maximum capacity of the power battery obtained by calculation under the condition that the power battery is fully charged or discharged last time as a maximum capacity of the power battery, and a step of obtaining the state of charge of the power battery at the current moment according to the state of charge of the power battery at the initial moment, the capacity variation and the maximum capacity. According to the invention, the SOC of the power battery is calculated, the maximum capacity is no longer replaced by a nominal capacity, the maximum capacity of the power battery is replaced by the actual maximum capacity of the SOC obtained by calculation when the power battery is fully charged or discharged last time, the influence of battery aging on the battery capacity is considered by using the value, so that the estimation of the SOC of the power battery is relatively accurate.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a method and device for estimating the SOC of a power battery of an electric vehicle. Background technique [0002] With the consumption of traditional energy and the continuous development of new energy technologies, batteries, as energy storage devices, are increasingly demanded by people because of their high utilization rate and safe use. [0003] The battery management system (Battery Magament System, BMS) is an important part of the electric vehicle, and the state of charge (State of Charge, SOC) estimation of the battery is one of the key technologies of the battery management system. If it is possible to accurately estimate information such as the remaining battery energy and mileage of an electric vehicle, it will provide great help to users of electric vehicles, and, in the case of obtaining these useful information, it will be convenient for users...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382
Inventor 楚金甫关炀李毅拓陈西山李洪超冯利平崔云飞
Owner HENAN SENYUAN HEAVY IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com