A method and system for predicting the sealing life of a pouch battery

A technology of sealed life and pouch battery, which is applied in the direction of measuring devices, instruments, and mechanical devices, etc., can solve the problem of slow tearing of the sealing edge, and achieve a high degree of self-learning effect

Active Publication Date: 2019-11-19
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in the actual application of soft-pack lithium-ion batteries, the tearing of the sealing edge is a very slow process, and the method of considering the time factor still needs to be perfected

Method used

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  • A method and system for predicting the sealing life of a pouch battery
  • A method and system for predicting the sealing life of a pouch battery
  • A method and system for predicting the sealing life of a pouch battery

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specific Embodiment

[0117] The present invention uses experimental data to predict the sealing life of the soft pack battery as follows:

[0118] Step 1: Import direct tear test data: including the maximum tearing force τ max =45N, complete tearing displacement λ c =2.00mm;

[0119] Step 2: Substitute the experimental data into formula G c =eτ max λ c The cohesive strength is 244.66J / m2;

[0120] Step 3: G c , Λ c Into the formula Obtain the film standard cohesion model;

[0121] Step 4: By comparing with the test data, adjust the parameters to obtain a satisfactory model:

[0122] Step 5: Calculate the tear strength degradation rate:

[0123] Take the average of multiple groups of tearing displacement d to get: d 5N,20h =0.099, d 10N,20h = 0.31, d 15N,20h = 0.42, d 20N,20h = 0.60;

[0124] The fitting slope of the loading time-tearing displacement curve is the tearing velocity v′ corresponding to the tearing displacement, where v′ 5N =1.4×10 -6 mm / s, v′ 10N =4.1×10 -6 mm / s. Use the load as the absci...

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Abstract

The invention discloses a soft package battery sealing life prediction method and a system. The method comprises the steps: obtaining complete tear displacement and cohesion strength according to thinfilm stripe fatigue loading test data and determining a thin film standard cohesion formula; determining a tear strength degradation rate according to thin film stripe accelerated degradation test data; determining a thin film cohesion formula in a direct tearing stage according to the tear strength degradation rate and the thin film standard cohesion; finally, determining soft package battery sealing life according to an intersection point between a thin film cohesion curve in the direct tearing stage and an actual stress curve determined by a battery thin film gas production equation. According to the soft package battery sealing life prediction method disclosed by the invention, a cohesion model is corrected by an accelerated degradation experiment, a corrected cohesion model containing time factors is provided, and the corrected cohesion model can be more suitable for the actual situation.

Description

Technical field [0001] The invention relates to the application field of fatigue life prediction, in particular to a method and system for predicting the sealing life of a soft pack battery. Background technique [0002] In the field of battery soft packs today, tear resistance is one of the indispensable and important properties of soft pack films in actual use. The tear strength can provide the basis for quality control, research and development. There are many test methods for measuring tear resistance, among which the Elémendorf method and the trouser tear method have been widely adopted by advanced countries. The Elemendorf method is only suitable for the determination of soft films, and corresponding national standards have been developed. The trouser-shaped tear method has a wide range of applications, and can measure hard, soft and embossed plastic films and sheets below 1mm. [0003] Regarding tear strength measurement tests, most of them are instant tear tests to obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 张慰刘宇鸣
Owner BEIHANG UNIV
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