Predicting method for lithiumion cell heat safety performance

A lithium-ion battery, safety performance technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of spending a lot of manpower and material resources

Inactive Publication Date: 2007-06-27
TIANJIN LISHEN BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, at least 10 kilograms of sample electrode materials are required to make an actual battery, and it takes a lot of manpower and material resources to make an actual battery

Method used

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  • Predicting method for lithiumion cell heat safety performance
  • Predicting method for lithiumion cell heat safety performance
  • Predicting method for lithiumion cell heat safety performance

Examples

Experimental program
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Embodiment Construction

[0020] Below in conjunction with the accompanying drawings and preferred embodiments, the specific implementation methods and features provided according to the present invention are described in detail as follows:

[0021] Referring to Figures 1-7, this representative example is simulated in a hot box test to illustrate the invention in further detail.

[0022] Description of hot box experiment:

[0023] The hot box test is one of the UL1642 lithium-ion battery safety standard experiments. Because the hot box test results are usually very repeatable, this makes the hot box test more generalizable than other methods in verifying the safety of lithium-ion batteries. The test is to attach a thermocouple to the surface of the battery, place the battery in a hot box, and heat the battery to a higher temperature at a heating rate of 5±1°C / min from an initial temperature (room temperature). For commercial batteries, the temperature of the hot box is generally required to be 150°C,...

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Abstract

The core of the technique is that the method builds thermal model of lithium ion battery under condition of abuse (for ex. hot box, short circuit, and overcharge) based on law of conservation of energy and Fourier law. Using thermal insulation technique for measuring heat determines kinetic parameter of internal heat source item in model; and other parameters come from documents and experiments. Using the model can forecast safety performance of battery under condition of abuse. Modifying model parameter obtains thermo-safety factors influencing lithium ion battery so as to provide theory basis of predicting safety critical value including size of battery, application temperature and material of battery for safety design of battery. The method reduces fussy working procedures for estimating safety performance of material and new battery by making actual battery and carrying out performance test. Advantages are: avoiding waste of resources and time, quick test speed, and low cost.

Description

technical field [0001] The invention relates to a method for predicting the performance of a lithium ion battery, in particular to a method for predicting the thermal safety performance of a lithium ion battery. technical background [0002] Lithium-ion batteries have the advantages of high average output voltage, large specific energy, stable discharge voltage, and long working life. Currently, they are widely used as power sources for mobile electronic products such as mobile phones, notebook computers, and camcorders. They may also become power sources for electric vehicles in the future. Its application field is very broad. As a battery, consumers are always eager for lithium-ion batteries with high capacity and long cycle life as the power source for their portable electronic products or electric vehicles. In order to meet customer requirements and increase their competitiveness in the industry, battery manufacturers continue to adopt high-capacity materials and develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 金慧芬高俊奎张绍丽
Owner TIANJIN LISHEN BATTERY
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