Method for estimating energy type lithium ion battery remaining capacity in wide temperature environment

A technology for battery remaining power and lithium-ion batteries, which is applied in the field of energy-type lithium-ion battery remaining power estimation, and can solve the problem that the battery does not consider the impact of battery remaining power.

Inactive Publication Date: 2013-08-07
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that the existing method for estimating the remaining power of the battery does not consider the influence of temperature on the remaining power of the battery, and provides a method for estimating the remaining power of an energy-type lithium-ion battery under a wide temperature environment

Method used

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  • Method for estimating energy type lithium ion battery remaining capacity in wide temperature environment
  • Method for estimating energy type lithium ion battery remaining capacity in wide temperature environment
  • Method for estimating energy type lithium ion battery remaining capacity in wide temperature environment

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specific Embodiment approach 1

[0034] Specific Embodiment 1: The method for estimating the remaining power of an energy-type lithium-ion battery under a wide temperature environment in this embodiment is implemented in the following steps:

[0035] 1. Under the temperature condition of T1=35℃, the lithium-ion battery is subjected to six rate discharge tests of 1C, 0.8C, 0.6C, 0.5C, 1 / 3C and 0.2C, and the lithium-ion battery is obtained at 1C and 0.8C. , 0.6C, 0.5C, 1 / 3C and 0.2C, the discharge capacities of the six rates are denoted as C 1C1 , C 0.8C1 , C 0.6C1 , C 0.5C1 , C 1 / 3C1 , C 0.2C1 ;

[0036] Under the temperature condition of T2=25°C, the lithium-ion battery was subjected to six rate discharge tests of 1C, 0.8C, 0.6C, 0.5C, 1 / 3C and 0.2C, and the lithium-ion battery was tested at 1C, 0.8C, 0.6 The discharge capacity of six rates of C, 0.5C, 1 / 3C and 0.2C is denoted as C 1C2 , C 0.8C2 , C 0.6C2 , C 0.5C2 , C 1 / 3C2 , C0.2C2 ;

[0037] Under the temperature condition of T3=10°C, the lithi...

specific Embodiment approach 2

[0059] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the lithium-ion battery is subjected to 1C, 0.8C, 0.6C, 0.5C, 1 / 3C and The discharge test of the six rates of 0.2C is as follows:

[0060] Step 1: Under normal temperature conditions, charge the lithium-ion battery at a rate of 1 / 3C until it is fully charged;

[0061] Step 2: Place the lithium-ion battery in an incubator whose temperature is set to T1=35°C for 12 hours;

[0062] Step 3: Then discharge, discharge to the cut-off voltage, and record the discharge capacity of the lithium-ion battery at six rates of 1C, 0.8C, 0.6C, 0.5C, 1 / 3C and 0.2C, respectively denoted as C 1C1 , C 0.8C1 , C 0.6C1 , C 0.5C1 , C 1 / 3C1 , C 0.2C1 .

[0063] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0064] 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 1C, 0.8C, 0.6C, 0.5C, 1 / The discharge test of six rates of 3C and 0.2C is as follows:

[0065] Step 1: Under normal temperature conditions, charge the lithium-ion battery at a rate of 1 / 3C until it is fully charged;

[0066] Step 2: Place the lithium-ion battery in an incubator whose temperature is set to T2 = 25°C for 12 hours;

[0067] Step 3: Then discharge, discharge to the cut-off voltage, and record the discharge capacity of the lithium-ion battery at six rates of 1C, 0.8C, 0.6C, 0.5C, 1 / 3C and 0.2C, respectively denoted as C 1C2 , C 0.8C2 , C 0.6C2 , C 0.5C2 , C 1 / 3C2 , C 0.2C2 .

[0068] Other step parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for estimating the energy type lithium ion battery remaining capacity in a wide temperature environment, which relates to the field of energy type lithium ion battery remaining capacity estimation and is used for solving a problem that the existing method for estimating the battery remaining capacity does not take temperature influence on the battery remaining capacity into consideration. The method comprises steps of: 1, carrying out six-discharge capacity discharge test on a lithium ion battery under six temperature conditions; 2, selecting 1 discharge capacity (C) as a highest discharge current and 0.2C as a lowest discharge current, and obtaining Peukert coefficients K and n under six temperature conditions; 3, carrying out curve fitting on six points so as to obtain a fitting formula which utilizes T as an independent variable and k as a dependent variable; 4, carrying out curve fitting on six points so as to obtain a fitting formula which utilizes T as an independent variable and n as a dependent variable; 5, adopting an available capacity formula; and 6, bringing Cava, I and T into a battery remaining capacity formula so as to estimate the power type lithium ion battery remaining capacities in different temperature environments. The method is applied to the field of battery remaining capacity estimation.

Description

technical field [0001] The invention relates to the field of estimating the remaining power of an energy-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 for...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 武国良徐冰亮董尔佳
Owner STATE GRID CORP OF CHINA
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