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Method for estimating generated heat of lithium ion battery under conditions of charge and discharge

A lithium-ion battery, charging and discharging technology, applied in the direction of measuring electric variables, calculating, measuring electricity, etc.

Active Publication Date: 2016-02-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, thermogravimetric analyzers, differential scanning calorimeters, and accelerating calorimeters are used at home and abroad to estimate the amount of heat generated by two or more substances inside the battery during charging and discharging, and the lithium-ion battery as a whole Less research subjects were involved

Method used

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  • Method for estimating generated heat of lithium ion battery under conditions of charge and discharge
  • Method for estimating generated heat of lithium ion battery under conditions of charge and discharge
  • Method for estimating generated heat of lithium ion battery under conditions of charge and discharge

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The variable of the charging condition is the charging current, and the rest of the initial temperature and heat dissipation conditions are constant. A lithium-ion battery with a capacity of 2600mAh is uniformly selected, the initial power is 0%, and the charging current is 5.2A, 7.8A, 9.1A, 9.8A, and 10.4A. The initial temperature was 23°C.

[0042] Referring to the method for estimating the heat generation of a lithium-ion battery under charging and discharging conditions in the technical solution, the heat generation of the lithium-ion battery to be tested in this embodiment is estimated under the charging condition, including the following steps:

[0043] (1) The thermal runaway test and analysis system of the lithium-ion battery is used to collect the temperature data of the lithium-ion battery to be tested under different electric heating conditions. The outlet points are respectively connected to the positive and negative poles of the first DC regulated power su...

Embodiment 2

[0057] Select the lithium-ion battery to be tested in Example 1, the lithium-ion battery with a capacity of 2600mAh, the initial electric quantity is 100%, and the discharge resistance is 0.1Ω, 0.2Ω, 0.3Ω, 0.5Ω, 1.5Ω in turn, and different discharge resistances are estimated Lower the heat generation of lithium-ion batteries.

[0058] With reference to the estimation method of Example 1, except that in step (1), the operation method of collecting the temperature data of the lithium-ion battery to be tested under different discharge conditions is different, the other steps are the same. The operation method of collecting the temperature data of the lithium-ion battery to be tested under different discharge conditions is as follows: insert the lithium-ion battery to be tested into the installation hole of the lithium-ion battery, insert the temperature sensor into the installation hole of the temperature sensor, open the temperature acquisition software, and check each channel W...

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Abstract

The invention discloses a method for estimating generated heat of a lithium ion battery under conditions of charge and discharge, and the method comprises the steps: firstly collecting temperature data of a to-be-detected lithium ion battery under the conditions of electric heating and charge and discharge; secondly inputting the temperature data of the battery under different electric heating power into data processing software, and determining the relation equation between the heat loss power and temperature of a lithium ion battery thermal runaway testing and analysis system through employing a thermal balance integro-differential equation (1) and a thermal balance integro-differential equation (2); thirdly inputting the temperature data of the battery under the conditions of charge and discharge into the data processing software, inputting heat, generated within a certain time period, of the lithium ion battery into the data processing software according to the heat of the lithium ion battery, which is obtained by a thermal balance integro-differential equation (3) and is generated within a certain time period, in a process of charge or discharge, and obtaining a relation curve between the charge / discharge heating rate and time and the total generated heat in the process of charge or discharge. The method takes the whole lithium ion battery as a research object, and can obtain the impact on the battery from the charge and discharge conditions.

Description

technical field [0001] The invention relates to a method for estimating heat generation of a lithium ion battery under charging and discharging conditions. Background technique [0002] In the 21st century, with the depletion of traditional natural resources such as coal, oil, and natural gas, chemical power has developed into an indispensable source of power in human life. Especially for lithium-ion batteries, this high-capacity secondary chemical power supply has become a popular choice for various portable devices such as mobile phones and notebook computers due to its advantages such as high working voltage, long cycle life, low self-discharge, fast charge and discharge, and no memory effect. The ideal green environmental protection power supply. But the widespread use of lithium-ion batteries has also brought more lithium-ion battery accidents. A large part of these accidents are caused by battery charging and discharging. [0003] By estimating the heat generated du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G06F19/00
Inventor 王志荣王昊郑杨艳刘婧婧郭林生
Owner NANJING UNIV OF TECH
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