Diaphragm capable of measuring pressure distribution in pole group and preparation method of diaphragm

An internal pressure and diaphragm technology, applied in the direction of measuring force, measuring device, battery pack components, etc., can solve the problems of uneven local stress, cell failure, affecting the performance of the battery, etc.

Pending Publication Date: 2021-07-23
LISHEN (QINGDAO) NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The local stress of the electrode group is uneven, which will lead to the failure of the battery cell and seriously affect the performance of the battery

Method used

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  • Diaphragm capable of measuring pressure distribution in pole group and preparation method of diaphragm
  • Diaphragm capable of measuring pressure distribution in pole group and preparation method of diaphragm

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Embodiment Construction

[0030] Below in conjunction with preferred embodiment, the specific implementation mode provided according to the present invention is described in detail as follows:

[0031] Referring to the drawings for details, this embodiment provides a diaphragm capable of measuring the pressure distribution in the pole group, including a diaphragm body, which includes upper and lower base films 1, 2 and color-developing capsules 3, the upper and lower layers An adhesive layer 4 mixed with color-developing capsules is arranged between the base films to form a pressure-sensitive diaphragm structure. Basement membrane pores are respectively arranged on the planes of the upper and lower basement membranes, and the diameter of the basement membrane pores is smaller than the diameter of the color-developing capsule. The pore diameters of the basement membranes of the upper and lower basement membranes and the diameters of the color-developing capsules are in the nanoscale. The upper and lowe...

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Abstract

The invention relates to a diaphragm capable of measuring pressure distribution in a pole group, which is characterized by comprising a diaphragm body, wherein the diaphragm body comprises an upper-layer base film, a lower-layer base film and a color developing capsule, and an adhesive layer mixed with the color developing capsule is arranged between the upper-layer base film and the lower-layer base film to form a pressure sensing diaphragm structure. The preparation method of the diaphragm comprises the steps of preparing the upper-layer base film and the lower-layer base film by adopting a mixing-extruding-casting and heat treatment process, preparing a color developing capsule by adopting an in-situ polymerization method, and placing the color developing capsule between the upper-layer base film and the lower-layer base film to form the pressure sensing diaphragm. The diaphragm disclosed by the invention has the beneficial effects that pressure distribution detection and pressure change monitoring in the preparation process can be realized in the pole group winding and hot pressing processes, and the diaphragm has important significance in guiding the relationship between the stress and the performance of a battery cell.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a diaphragm capable of measuring the pressure distribution in an electrode group and a preparation method thereof. Background technique [0002] During the winding or actual cycle of the battery, the stress change is the main reason affecting the performance of the electrode group. The local stress of the electrode group is uneven, which will lead to the failure of the battery cell and seriously affect the performance of the battery. Therefore, in the process of cell manufacturing, it is very important to test the stress distribution of the pole group. Therefore, in the manufacture of lithium batteries, it is urgent to develop a method that can simply and quickly detect and monitor the stress changes at different positions inside the electrode group during the charging and discharging process of the battery, so as to facilitate the analysis of the failure s...

Claims

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Application Information

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IPC IPC(8): H01M50/417H01M50/446H01M50/451H01M50/403H01M10/48G01L1/00H01M10/052H01M10/0587
CPCG01L1/00H01M10/052H01M10/0587H01M10/488Y02E60/10Y02P70/50
Inventor 薛有宝曾涛徐晓明赵李鹏刘伯峥田威万柳张凯博周江伍绍中
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD
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