Method for Estimating Residual Capacity of Power Lithium-ion Batteries in Different Temperature Environments

A technology for remaining battery power and lithium-ion batteries, which is applied in the field of power-type lithium-ion battery remaining power estimation, and can solve the problems of failing to truly reflect the SOC value and low accuracy of quadratic function fitting.

Active Publication Date: 2015-11-18
STATE GRID CORP OF CHINA +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention is to solve the problem that the quadratic function fitting of the Peukert equation coefficient of the Ni-MH battery in the existing method for estimating the remaining battery power is low in accuracy and cannot truly reflect the SOC value, and provides a power type lithium-ion battery under different temperature environments. Method for Estimating Remaining Battery Power

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
  • Method for Estimating Residual Capacity of Power Lithium-ion Batteries in Different Temperature Environments
  • Method for Estimating Residual Capacity of Power Lithium-ion Batteries in Different Temperature Environments
  • Method for Estimating Residual Capacity of Power Lithium-ion Batteries in Different Temperature Environments

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0037] Specific implementation mode 1: The method for estimating the remaining power of a power type lithium-ion battery under different temperature environments in this implementation mode is implemented according to the following steps:

[0038] 1. Under the temperature condition of T1=35℃, the lithium-ion battery is subjected to six rate discharge tests of 10C, 7C, 5C, 3C, 1C and 1 / 3C, and the lithium-ion battery is tested at 10C, 7C, 5C, 3C, The discharge capacity of the six rates of 1C and 1 / 3C is denoted as C 10C1 , C 7C1 , C 5C1 , C 3C1 , C 1C1 , C 1 / 3C1 ;

[0039]Under the temperature condition of T2=25°C, the lithium-ion battery was subjected to six rate discharge tests of 10C, 7C, 5C, 3C, 1C and 1 / 3C, and the lithium-ion battery was tested at 10C, 7C, 5C, 3C, 1C and The discharge capacity of the six rates of 1 / 3C is denoted as C 10C2 , C 7C2 , C 5C2 , C 3C2 , C 1C2 , C 1 / 3C2 ;

[0040] Under the temperature condition of T3=10°C, the lithium-ion battery w...

specific Embodiment approach 2

[0066] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the lithium-ion battery is subjected to six steps of 10C, 7C, 5C, 3C, 1C and 1 / 3C under the temperature condition of T1=35°C. The specific rate discharge test is as follows:

[0067] Step 1: Charge the lithium-ion battery at a rate of 1 / 3C at room temperature;

[0068] Step 2: Place the lithium-ion battery in an incubator whose temperature is set to T1=35°C for 12 hours;

[0069] Step 3: Then discharge, discharge to the cut-off voltage, and record the discharge capacity of the lithium-ion battery at six rates of 10C, 7C, 5C, 3C, 1C and 1 / 3C, respectively denoted as C 10C1 , C 7C1 , C 5C1 , C 3C1 , C 1C1 , C 1 / 3C1 . Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0070] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 1, the lithium-ion battery is subjected to 10C, 7C, 5C, 3C, 1C and 1 / 3C under the temperature condition of T2=25°C The discharge test of six rates is as follows:

[0071] Step 1: Charge the lithium-ion battery at a rate of 1 / 3C at room temperature;

[0072] Step 2: Place the lithium-ion battery in an incubator whose temperature is set to T2 = 25°C for 12 hours;

[0073] Step 3: Then discharge, discharge to the cut-off voltage, and record the discharge capacity of the lithium-ion battery at six rates of 10C, 7C, 5C, 3C, 1C and 1 / 3C, respectively denoted as C 10C2 , C 7C 2,C 5C2 , C 3C2 , C 1C2 , C 1 / 3C2 . Other step parameters are the same as those in Embodiment 1 or 2.

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 discloses an estimating method for power-type lithium ion battery remaining capacity under different temperature environments and relates to the field of power-type lithium ion battery remaining capacity estimation. The invention aims to solve the problem that the influence of the temperature on the battery remaining capacity is not considered by adopting a traditional estimating method for the battery remaining capacity. The estimating method for the power-type lithium ion battery remaining capacity under the different temperature environments comprises the following steps: I, conducting a discharge test of 6 multiplying power on a lithium ion battery under six temperature conditions; II, selecting 10C multiplying power as highest discharge current and 1 / 3C multiplying power as lowest discharge current to obtain Peukert factors K and n of the six temperature conditions; III, performing curve fitting on six points to obtain a fitting formula taking T as an independent variable and k as a dependent variable; IV, performing curve fitting on six points to obtain a fitting formula taking T as the independent variable and n as the dependent variable; V, establishing an available capacity formula; and VI, substituting Cava, I and T into a battery remaining capacity formula (4) to estimate the power-type lithium ion battery remaining capacity under the different temperature environments. The estimating method for the power-type lithium ion battery remaining capacity under the different temperature environments disclosed by the invention is applied to the field of the battery remaining capacity estimation.

Description

technical field [0001] The invention relates to the field of estimating the remaining power of a power type lithium ion battery. Background technique [0002] The research on the remaining power of the battery mainly considers the application under normal temperature conditions, and there are few studies on the estimation of the remaining power of the battery under different temperature environments. The traditional Peukert equation is a way to estimate the remaining capacity of the battery, but it also does not fully consider the temperature effect. [0003] The most famous method for estimating the available capacity of the battery is the Peukert equation proposed by Peukert in 1897, which describes the relationship between the available capacity of the battery and the discharge current, and has been widely accepted. The formula is: [0004] C ava,I =K*I (1-n) [0005] Among them, K and n are constants, called Peukert coefficients K and n. [0006] However, this formu...

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 Patents(China)
IPC IPC(8): G01R31/36
Inventor 武国良徐冰亮董尔佳
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap