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Detection method of lithium ion battery diaphram material edge flexibility

A technology for lithium ion batteries and diaphragm materials, which is applied in the field of detection of edge curvature of lithium ion battery diaphragm materials, can solve the problems of difficult quantitative detection of rolling uniformity, and achieves short detection time, high accuracy and simple detection. Effect

Inactive Publication Date: 2006-06-28
TIANJIN LISHEN BATTERY
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Problems solved by technology

First of all, this evaluation method does not exclude the presence of surface tension of the diaphragm in the winding process, which can compensate to a certain extent for the irregularity of the winding edge caused by the bending of the diaphragm edge; It is difficult to quantitatively detect the winding uniformity of the diaphragm wound on the core

Method used

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  • Detection method of lithium ion battery diaphram material edge flexibility

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Embodiment Construction

[0011] Below in conjunction with the accompanying drawings and preferred embodiments, the specific embodiments provided according to the present invention are described in detail as follows:

[0012] like figure 1 As shown, a method for detecting the edge curvature of a lithium ion battery diaphragm material is characterized in that the following steps are performed in sequence:

[0013] (1) Take a 120-200cm long diaphragm material 1 to be tested, and each diaphragm material 1 has a length greater than 20cm of the specified detection length, and spread it lightly on a smooth flat plate (such as a wooden desk surface) that does not generate electrostatic adsorption. One end (such as the left end) is pressed with a heavy object;

[0014] (2) Lightly brush several times along the length direction of the diaphragm material 1 with a soft wool brush, until the surface of the diaphragm material 1 is flat and smooth on the flat plate;

[0015] (3) Use a vertical combination of a sca...

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Abstract

A method for detecting edge flexibility of Li ion cell diaphragm material includes taking 120 ¿C 200 cm of diaphragm material to be detected with 20cm longer than specified detection length, laying it on smooth flat plate with no static electricity being generated to each other, brushing it for a numbers of times along longitudinal direction of diaphragm material with soft brush till it is laid on plate smoothly, using 100 ¿C 150 cm and 10 ¿C 30 cm vertical integrated scale to measure flexible deformation along diaphragm material length direction and recording detected value.

Description

technical field [0001] The invention relates to a method for detecting a diaphragm material for a battery, in particular to a method for detecting the edge curvature of a diaphragm material for a lithium ion battery. Background technique [0002] The separator for lithium ion battery is a polymer film material with a thickness of only ten to several tens of microns. The deformation will be more difficult to control, causing inconvenience to the winding process in the battery production, and it is easy to cause the overlapping of the positive and negative plates and the adjustment of the winding alignment of the pole group, resulting in the overlapping of the positive and negative plates, resulting in a short circuit of the battery. The winding of the battery electrode group is an important link in the entire battery manufacturing process. The alignment of the electrode group winding directly affects the safety of the battery, and the bending degree of the separator edge is a...

Claims

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Application Information

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IPC IPC(8): G01B21/32
Inventor 张俊玉纪书文王茂海
Owner TIANJIN LISHEN BATTERY
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