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Sealing life prediction method for flexible-packaging lithium-ion batteries

A lithium-ion battery, ion battery technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as lack of

Active Publication Date: 2017-10-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently a lack of corresponding methods for the prediction and evaluation of the seal life of soft-pack lithium-ion batteries under actual use conditions.

Method used

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  • Sealing life prediction method for flexible-packaging lithium-ion batteries
  • Sealing life prediction method for flexible-packaging lithium-ion batteries
  • Sealing life prediction method for flexible-packaging lithium-ion batteries

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Embodiment Construction

[0081] Exemplary embodiments, features, and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0082] Such as figure 1 As shown, the pouch lithium ion battery of the present invention includes a battery body 1 , a packaging surface 2 surrounding the battery body 1 , and electrodes 3 located on the battery body 1 . Under the actual use conditions of soft-pack lithium-ion batteries, problems such as cracking and tearing often occur, such as figure 1 Seal failure point 4 occurs on package surface 2 shown.

[0083] Such as figure 2 Shown, wherein the reference numeral 5 represents the bonding interface. When establishing a cohesion model considering the degradation effect, as...

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Abstract

The invention relates to a sealing life prediction method for flexible-packaging lithium-ion batteries and belongs to the technical field of sealing life prediction. The sealing life prediction method includes the steps of determining key degradation mechanism and building a bonding interface cohesive zone model based on consideration of degradation effect; determining a degradation trend that environmental degradation factor changes along with stress by building a degradation accelerating model; calculating to obtain a bonding interface strength time model on condition of different stress according to the initial bonding strength; determining a stress time model based on the function relationship between air pressure and time by a simulation method; and finally, predicting the sealing life of the flexible-packaging lithium-ion battery according to the generalized stress strength theory. According to the sealing life prediction method, the influence to the degradation process within the whole life circle of the outer packaging sealing material from the internal pressure of the lithium-ion battery is taken into consideration, variation trend of the sealing performance of the lithium-ion battery in actual use is simulated, the sealing life of the flexible-packaging lithium-ion battery on different environmental conditions can be calculated in theory, and the method has high engineering applicability.

Description

technical field [0001] The invention belongs to the field of seal life analysis, in particular to a method for predicting the seal life of a soft-pack lithium-ion battery. Background technique [0002] Life prediction generally refers to evaluating the life level of a product through historical information or life test data, so as to predict the life of the product under actual operating conditions. Due to the immature packaging technology of large-capacity soft-pack lithium-ion batteries, there are seal failures such as air leakage and liquid leakage in the actual use process, resulting in the failure of lithium-ion battery functions and the reduction of service life. Therefore, how to reasonably and accurately predict the sealing life of pouch lithium-ion batteries is a key issue that needs to be solved urgently. [0003] At present, domestic and foreign research is mostly focused on the preparation of sealing materials and the improvement of packaging technology. By eva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/04
Inventor 陈云霞龚文俊张慰康锐
Owner BEIHANG UNIV
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