WO2011026431A1 - Testing method for battery diaphragm size change rate - Google Patents

Testing method for battery diaphragm size change rate Download PDF

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Publication number
WO2011026431A1
WO2011026431A1 PCT/CN2010/076556 CN2010076556W WO2011026431A1 WO 2011026431 A1 WO2011026431 A1 WO 2011026431A1 CN 2010076556 W CN2010076556 W CN 2010076556W WO 2011026431 A1 WO2011026431 A1 WO 2011026431A1
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sample
change rate
dimensional change
testing
test
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PCT/CN2010/076556
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French (fr)
Chinese (zh)
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唐少俊
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奇瑞汽车股份有限公司
芜湖普威技研有限公司
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Publication of WO2011026431A1 publication Critical patent/WO2011026431A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention belongs to the technical field of hybrid vehicle manufacturing, and particularly relates to a testing technology of a lithium ion battery separator used in a hybrid vehicle. Background technique
  • the main function of the lithium ion battery separator is to prevent direct electronic contact between the positive and negative electrodes in the battery, ensuring that ions can pass freely.
  • the battery separator is a polymer material, long-chain molecules are stretched and frozen during processing. When the activation energy of the molecule is increased, the segment has a certain degree of curl, so that the size of the product is somewhat to some extent.
  • the change usually expressed in terms of dimensional change rate (also called dimensional shrinkage). Excessive dimensional change of the battery separator can cause the diaphragm to rupture or the electrode to be exposed, resulting in a short circuit inside the battery. Therefore, it is necessary to accurately measure the dimensional change rate of the battery separator before it is applied to the product to prevent the above. There are currently no mature test methods available. Summary of the invention
  • the object of the present invention is to provide a test method for the dimensional change rate of a battery separator to conveniently, quickly and accurately measure the dimensional change rate of the battery separator to ensure the safe use of the lithium ion battery.
  • the key to the test method for the dimensional change rate of the battery separator of the present invention is to include the following steps:
  • A intercepting the sample on the diaphragm material to be tested
  • the sample is placed in the test environment for a predetermined time for testing
  • E The sample is taken out from the test environment, and subjected to climate adaptation treatment, and then the final size is measured;
  • F The dimensional change rate is calculated according to the measured original size and final size of the sample.
  • the sample should be taken from the plane position of the diaphragm material to be tested.
  • the predetermined shape described in the above step B is preferably rectangular or circular.
  • the climatic adaptation treatment is carried out at 23 ° C to 40 ° C for at least 30 minutes, so as to ensure that the material properties of the sample tend to be stable after being taken out from the test environment, and the measurement error is reduced.
  • Figure 1 is a schematic view showing the shape of a battery separator sample of Example 1;
  • Fig. 2 is a view showing the shape of a battery separator sample of Example 2. detailed description
  • E The sample was taken out from the test environment and placed at 30 ° C for at least 30 minutes for climatic adaptation treatment, and then the final length and final width W 1 were measured ;
  • F Calculate the dimensional change rate based on the measured original size and final size of the sample. The formula for calculating the dimensional change rate is as follows:
  • Wi The final width after a sample test, in units of (mm).
  • Each sample is calculated with the maximum change value. Usually, the arithmetic mean of three samples is taken as the test result, and the positive value indicates shrinkage.
  • the sample is cut into a circular shape, and the original diameter of the sample in multiple directions ( ⁇ 1 to ⁇ 5 ) and the corresponding test are tested.
  • the final diameter is obtained to obtain the dimensional change rate of the sample in the above plurality of directions.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

A testing method for a battery diaphragm size change rate involves：cutting out a sample on a diaphragm material to be tested, and cutting the sample according to a preset shape e.g. circular shape; measuring the original size of the sample under an initial environmental condition; placing the sample into a testing environment for a preset time; taking out the sample from the testing environment; measuring the final size of the sample; calculating the size change rate of the sample according to the measured original size and the final size of the sample.

Description

电池隔膜尺寸变化率的测试方法 技术领域  Test method for dimensional change rate of battery separator
本发明属于混合动力车制造技术领域， 特别涉及到混合动力车所用的锂离子电池 隔膜的测试技术。 背景技术  The invention belongs to the technical field of hybrid vehicle manufacturing, and particularly relates to a testing technology of a lithium ion battery separator used in a hybrid vehicle. Background technique
锂离子电池隔膜最主要的功能是阻止正负电极在电池中的直接的电子接触， 保证 离子可以自由通过。 由于电池隔膜是高分子材料， 在加工过程中， 长链的分子被拉伸 冻结， 当分子的活化能提高后， 使链段有某种程度的卷曲， 从而使制品的尺寸发生某 种程度的变化， 通常用尺寸变化率表示（也有叫尺寸收縮率）。 电池隔膜的尺寸变化率 过大， 会导致隔膜破裂或电极裸露， 从而导致电池内部短路现象发生。 因此在将电池 隔膜应用于产品之前必须准确测量其尺寸变化率， 防止上述情况发生。 目前还没有成 熟的测试方法可以利用。 发明内容  The main function of the lithium ion battery separator is to prevent direct electronic contact between the positive and negative electrodes in the battery, ensuring that ions can pass freely. Since the battery separator is a polymer material, long-chain molecules are stretched and frozen during processing. When the activation energy of the molecule is increased, the segment has a certain degree of curl, so that the size of the product is somewhat to some extent. The change, usually expressed in terms of dimensional change rate (also called dimensional shrinkage). Excessive dimensional change of the battery separator can cause the diaphragm to rupture or the electrode to be exposed, resulting in a short circuit inside the battery. Therefore, it is necessary to accurately measure the dimensional change rate of the battery separator before it is applied to the product to prevent the above. There are currently no mature test methods available. Summary of the invention
本发明的目的是提出一种电池隔膜尺寸变化率的测试方法， 以方便、 快捷、 准确 地测量电池隔膜的尺寸变化率， 保证锂离子电池的使用安全。  The object of the present invention is to provide a test method for the dimensional change rate of a battery separator to conveniently, quickly and accurately measure the dimensional change rate of the battery separator to ensure the safe use of the lithium ion battery.
本发明的电池隔膜尺寸变化率的测试方法关键在于包括如下步骤：  The key to the test method for the dimensional change rate of the battery separator of the present invention is to include the following steps:
A: 在待测隔膜材料上截取试样；  A: intercepting the sample on the diaphragm material to be tested;
B : 按预定形状切割试样；  B : cutting the sample in a predetermined shape;
C: 在初始环境条件下测试试样的原始尺寸并记录；  C: test the original size of the sample under initial environmental conditions and record;
D: 将试样在测试环境下放置预定时间进行测试；  D: The sample is placed in the test environment for a predetermined time for testing;
E: 将试样从测试环境中取出， 并进行气候适应处理， 然后测量其最终尺寸； F: 根据测得的试样原始尺寸及最终尺寸计算其尺寸变化率。  E: The sample is taken out from the test environment, and subjected to climate adaptation treatment, and then the final size is measured; F: The dimensional change rate is calculated according to the measured original size and final size of the sample.
为保证试样的平整性， 进而保证测试的准确性， 上述 A步骤中， 应从待测隔膜材 料的平面位置截取试样。  In order to ensure the flatness of the sample and thus ensure the accuracy of the test, in the above A step, the sample should be taken from the plane position of the diaphragm material to be tested.
为方便后续测试方向的选取及计算， 上述 B步骤中所述的预定形状最好为矩形或 圆形。  In order to facilitate the selection and calculation of the subsequent test directions, the predetermined shape described in the above step B is preferably rectangular or circular.
为保证试样的材质性质已经稳定， 进而保证其原始尺寸的测量准确， 在上述 C步 骤中， 最好将试样在初始环境条件下放置 24小时以上再进行测试。 In order to ensure that the material properties of the sample have been stabilized, and thus the measurement of the original size is ensured, in the above C step In the first step, it is best to leave the sample under initial environmental conditions for more than 24 hours before testing.
为防止试样在测试环境下卷曲变形， 影响后续测量， 上述 D步骤中最好将试样平 放在支撑物上， 然后再在测试环境下放置预定时间进行测试。  In order to prevent the specimen from being curled and deformed under the test environment and affecting the subsequent measurement, it is preferable to place the sample on the support in the above D step, and then place it for a predetermined time in the test environment for testing.
上述 E步骤中， 所述气候适应处理为在 23 °C〜40°C下放置至少 30分钟， 这样可 以保证试样从测试环境中取出后其材质性质趋于稳定， 减少测量误差。  In the above E step, the climatic adaptation treatment is carried out at 23 ° C to 40 ° C for at least 30 minutes, so as to ensure that the material properties of the sample tend to be stable after being taken out from the test environment, and the measurement error is reduced.
上述 F步骤中， 尺寸变化率的计算公式如下： S OO^Lo-L /Lo, 其中 Lo为试样 在测试方向的初始长度， 为试样在测试方向的最终长度， S 为试样在测试方向的尺 寸变化率， 其单位为％。  In the above F step, the formula for calculating the dimensional change rate is as follows: S OO^Lo-L /Lo, where Lo is the initial length of the sample in the test direction, the final length of the sample in the test direction, and S is the test of the sample. The dimensional change rate of the direction, the unit is %.
本发明的电池隔膜尺寸变化率的测试方法步骤简单、 测试条件要求低， 通过两个 环境下的对比测试， 可以方便、 快捷地测得电池隔膜的尺寸变化率， 另外本发明的测 试方法还通过设定特殊的试样预定形状、 测试过程中采用支撑物进行支撑、 增加气候 适应处理等步骤来减少测量误差， 保证测试数据的准确。 附图说明  The test method for the dimensional change rate of the battery separator of the invention has the advantages of simple steps and low test condition requirements, and the dimensional change rate of the battery separator can be conveniently and quickly measured by the comparison test under two environments, and the test method of the invention also passes Set the special shape of the sample, support the support during the test, increase the climate adaptation process, etc. to reduce the measurement error and ensure the accuracy of the test data. DRAWINGS
图 1是实施例 1的电池隔膜试样形状示意图；  Figure 1 is a schematic view showing the shape of a battery separator sample of Example 1;
图 2是实施例 2的电池隔膜试样形状示意图。 具体实施方式  Fig. 2 is a view showing the shape of a battery separator sample of Example 2. detailed description
下面结合具体实施例和附图来详细说明本发明。  The invention will be described in detail below with reference to specific embodiments and drawings.
实施例 1 :  Example 1
本实施例的测试方法步骤如下：  The steps of the test method of this embodiment are as follows:
A: 在待测隔膜材料的平面位置截取试样；  A: taking a sample at a plane position of the diaphragm material to be tested;
B: 如图 1所示， 将试样切割成矩形；  B: Cut the sample into a rectangle as shown in Figure 1.
C: 在温度 23°C， 相对湿度 50 %的初始环境条件下放置 24小时， 然后测试试样 的原始长度 LQ和原始宽度 WQ (测量三次取平均值）， 并记录； C: placed under initial environmental conditions of 23 ° C and 50% relative humidity for 24 hours, and then tested the original length L Q of the sample and the original width W Q (measured three times) and recorded;
D: 根据测试要求将烘箱的温度调高到预定温度 100°C， 待烘箱内部温度稳定后将 试样平放在规定的支撑物上放入烘箱， 放置时间到达预定时间 （一般为一个小时） 后 取出；  D: According to the test requirements, raise the temperature of the oven to a predetermined temperature of 100 ° C. After the internal temperature of the oven is stable, place the sample on the specified support and put it into the oven. The settling time reaches the predetermined time (usually one hour). After taking out;
E: 将试样从测试环境中取出， 并在 30°C下放置至少 30分钟进行气候适应处理， 然后测量其最终长度 和最终宽度 W1 ; F: 根据测得的试样原始尺寸及最终尺寸计算其尺寸变化率，尺寸变化率的计算公 式如下： E: The sample was taken out from the test environment and placed at 30 ° C for at least 30 minutes for climatic adaptation treatment, and then the final length and final width W 1 were measured ; F: Calculate the dimensional change rate based on the measured original size and final size of the sample. The formula for calculating the dimensional change rate is as follows:
S^lOO^Lo-L /Lo (1) S^lOO^Lo-L /Lo (1)
Figure imgf000005_0001
Figure imgf000005_0001
式中： Si—- -试样长度变化率， 单位为 （％)；  Where: Si—--the length change rate of the sample, the unit is (%);
s2 -试样宽度变化率， 单位为 （％)； s 2 - the width change rate of the sample, the unit is (%);
Lo -一试样原始长度， 单位为 （mm) ;  Lo - the original length of a sample, the unit is (mm);
Li -一试样试验后的最终长度， 单位为 （mm) ;  Li - the final length of the test after the test, the unit is (mm);
Wo—一试样原始宽度， 单位为 （mm) ;  Wo—the original width of a sample, in units of (mm);
Wi—一试样试验后的最终宽度， 单位为 （mm)。  Wi—The final width after a sample test, in units of (mm).
每个试样以最大变化值计算结果， 通常取三个试样的算数平均值作为试验结果， 正值表示收縮。  Each sample is calculated with the maximum change value. Usually, the arithmetic mean of three samples is taken as the test result, and the positive value indicates shrinkage.
实施例 2:  Example 2:
如图 2所示， 与实施例 1不同的是， 在本实施例中， 将试样切割成圆形， 并测试 试样在多个方向 （Φ 1〜Φ 5 ) 的原始直径及相应的测试后的最终直径， 以获得试样在 上述多个方向上的尺寸变化率。  As shown in FIG. 2, unlike Embodiment 1, in the present embodiment, the sample is cut into a circular shape, and the original diameter of the sample in multiple directions (Φ 1 to Φ 5 ) and the corresponding test are tested. The final diameter is obtained to obtain the dimensional change rate of the sample in the above plurality of directions.
最后所应说明的是： 以上实施例仅用以说明本发明而非限制， 尽管参照较佳实施 例对本发明进行了详细说明， 本领域的普通技术人员应当理解， 可以对本发明进行修 改或者等同替换， 而不脱离本发明的精神和范围， 其均应涵盖在本发明的权利要求范 围当中。  It should be noted that the above embodiments are only intended to illustrate the invention and are not to be construed as limiting the scope of the invention. The spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

权利要求书 Claim
1、 一种电池隔膜尺寸变化率的测试方法， 其特征在于， 包括如下步骤：  A method for testing a dimensional change rate of a battery separator, comprising the steps of:
A: 在待测隔膜材料上截取试样；  A: intercepting the sample on the diaphragm material to be tested;
B : 按预定形状切割试样；  B : cutting the sample in a predetermined shape;
C: 在初始环境条件下测试试样的原始尺寸并记录；  C: test the original size of the sample under initial environmental conditions and record;
D: 将试样在测试环境下放置预定时间进行测试；  D: The sample is placed in the test environment for a predetermined time for testing;
E: 将试样从测试环境中取出， 并进行气候适应处理， 然后测量其最终尺寸； F: 根据测得的试样原始尺寸及最终尺寸计算其尺寸变化率。  E: The sample is taken out from the test environment, and subjected to climate adaptation treatment, and then the final size is measured; F: The dimensional change rate is calculated according to the measured original size and final size of the sample.
2、 如权利要求 1所述的电池隔膜尺寸变化率的测试方法， 其特征在于 A步骤中， 从待测隔膜材料的平面位置截取试样。  A method for testing a dimensional change rate of a battery separator according to claim 1, wherein in the step A, the sample is taken from a plane position of the material to be tested.
3、 如权利要求 1所述的电池隔膜尺寸变化率的测试方法， 其特征在于 B步骤中， 所述预定形状为矩形或圆形。  3. The method of testing a dimensional change rate of a battery separator according to claim 1, wherein in the step B, the predetermined shape is a rectangle or a circle.
4、 如权利要求 1所述的电池隔膜尺寸变化率的测试方法， 其特征在于 C步骤中， 试样在初始环境条件下放置 24小时以上再进行测试。  A method for testing a dimensional change rate of a battery separator according to claim 1, wherein in the step C, the sample is placed under initial environmental conditions for more than 24 hours and then tested.
5、 如权利要求 1所述的电池隔膜尺寸变化率的测试方法， 其特征在于 D步骤中， 将试样平放在支撑物上， 然后再在测试环境下放置预定时间进行测试。  A method for testing a dimensional change rate of a battery separator according to claim 1, wherein in the step D, the sample is placed on a support and then placed in a test environment for a predetermined time for testing.
6、 如权利要求 1所述的电池隔膜尺寸变化率的测试方法， 其特征在于 E步骤中， 所述气候适应处理为在 23 °C〜40 °C下放置至少 30分钟。  6. The method for testing a dimensional change rate of a battery separator according to claim 1, wherein in the step E, the climatic adaptation treatment is carried out at 23 ° C to 40 ° C for at least 30 minutes.
7、 如权利要求 1所述的电池隔膜尺寸变化率的测试方法， 其特征在于 F步骤中， 尺寸变化率的计算公式如下： S OO^Lo-I^/Lo, 其中 Lo为试样在测试方向的初始长 度， 为试样在测试方向的最终长度， S为试样在测试方向的尺寸变化率。  7. The method for testing a dimensional change rate of a battery separator according to claim 1, wherein in the F step, the formula for calculating the dimensional change rate is as follows: S OO^Lo-I^/Lo, wherein Lo is a test specimen. The initial length of the direction is the final length of the specimen in the test direction, and S is the dimensional change rate of the specimen in the test direction.
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