Method for detecting thermal stability of battery separator

A detection method and battery diaphragm technology, applied in measuring devices, material thermal analysis, instruments, etc., can solve problems such as inaccurate reflection of thermal stability, and achieve the effect of simple equipment

Inactive Publication Date: 2016-03-30
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this test method cannot accurately reflect the thermal stability of the lithium-ion battery when it is needled, so the present invention uses a simulated lithium-ion battery to measure the change of the diaphragm when it is needled.

Method used

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  • Method for detecting thermal stability of battery separator
  • Method for detecting thermal stability of battery separator
  • Method for detecting thermal stability of battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Take a 12μm thick PP material separator and coat one side with 4μm thick AL 2 o 3 Material. Then mark the diaphragm as sample A, and cut it into 5 samples with a size of 100*50mm, which are marked as A1, A2, A3, A4, and A5 respectively;

[0034] 2. Spread the 20 μm thick aluminum foil 3 on the smooth glass plate 1, and then spread the separator 2 on the aluminum foil 3, AL 2 o 3 The coated side faces up, and the two ends of the diaphragm are pressed with a pressing block to prevent the diaphragm from sliding during the test;

[0035] 3. Heat the surface temperature of soldering iron 1 with a φ of 1.0mm to 400°C and keep it for 10 minutes;

[0036] 4. Pierce the soldering iron 1 vertically towards the middle of the diaphragm sample 2, keep still, and remove the soldering iron along the vertical direction of the diaphragm after 5 seconds;

[0037] 5. Measure the diameter of the hole perforated by the soldering iron on the diaphragm with a two-dimensional imager, a...

Embodiment 2

[0041] Take the 12 μm thick PP material base film of the same specification in Example 1, and coat it with 2 μm thick AL on both sides. 2 o 3 Material. Then mark the diaphragm as sample B, and cut it into five samples of 100*50mm size, which are respectively marked as B1, B2, B3, B4, and B5;

[0042] According to the test method in Example 1, sample B was subjected to hot-smelting experiments, and recorded in Table 2.

[0043] Table 2 Test results of sample B hot-soldering experiment

[0044]

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Abstract

The needling experiment is an important test for evaluating the safety performance of a lithium-ion battery, performance such as the pore closing temperature, the breaking temperature, the thermal stability and the like of a separator are particularly critical and related to probability of avoidance of thermal runaway of the lithium-ion battery. However, few testing methods for the thermal stability of the separator exist at present, and the most common method is placing the separator in a constant-temperature oven at a certain temperature for baking for a certain period and measuring the change of the size of the separator. However, the testing method cannot accurately reflect the thermal stability of the lithium-ion battery during needling, so that the invention adopts a method for simulating the lithium-ion battery during needling and measuring the change of the separator.

Description

technical field [0001] The invention belongs to the field of polymer material testing, and in particular relates to the thermal stability of lithium-ion battery diaphragms at high temperatures. technical background [0002] With the improvement of lithium-ion battery technology, the popularity of electric vehicles has entered people's lives more and more. However, the safety of lithium-ion batteries is still the focus of people's attention, especially the goal mentioned in the "Energy Saving and New Energy Vehicle Industry Development Plan (2012-2020)" promulgated by the State Council. By 2020, the energy of power battery modules The density reaches 300Wh / kg. In order to increase the energy density of the battery to a greater extent, many power battery manufacturers have begun to gradually shift from the iron-lithium system to the ternary system. This undoubtedly puts forward higher requirements for lithium-ion materials to ensure the safety of lithium-ion batteries. [0...

Claims

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Application Information

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IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 李世隆秦银银许建光陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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