WO2020173120A1 - Chuck for lithium ion battery diaphragm wet compression test and test method thereof - Google Patents
Chuck for lithium ion battery diaphragm wet compression test and test method thereof Download PDFInfo
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- WO2020173120A1 WO2020173120A1 PCT/CN2019/114908 CN2019114908W WO2020173120A1 WO 2020173120 A1 WO2020173120 A1 WO 2020173120A1 CN 2019114908 W CN2019114908 W CN 2019114908W WO 2020173120 A1 WO2020173120 A1 WO 2020173120A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- the invention belongs to the field of compression performance testing, relates to the field of wet compression performance of lithium ion battery diaphragms, and in particular relates to a clamp for wet compression test of lithium ion battery diaphragms and a test method thereof.
- Lithium-ion battery is a popular energy device, and one of its important components is the diaphragm, which plays a key role in the safety of battery use. Since lithium-ion batteries are environmentally friendly and pollution-free secondary batteries, they meet the development needs of energy and environmental protection in various countries today, and their use in various industries is rapidly increasing.
- Lithium-ion battery cells are mainly composed of positive electrode material, negative electrode material, electrolyte and diaphragm.
- the diaphragm acts as an electronic isolation, preventing direct contact between the positive and negative electrodes and allowing lithium ions in the electrolyte to be free
- the diaphragm also plays a vital role in ensuring the safe operation of the battery.
- the diaphragm must meet the following conditions: (1) Chemical stability: no reaction with electrolyte and electrode materials; (2) wettability: with electrolyte Easy to infiltrate without elongation or shrinkage; (3) Thermal stability: resistant to high temperature, with high fusing isolation; (4) Porosity: higher porosity to meet the needs of ion conductivity; (5) Mechanical properties: The separator needs to have a certain mechanical strength in the battery structure and the process of charging and discharging.
- the separator An important function of the separator is to separate the positive and negative reactions. If the separator shrinks or ruptures and causes the electrolyte to penetrate, a battery short circuit will occur. , Has a great safety hazard, so the diaphragm needs to have certain mechanical strength and toughness. In addition, the diaphragm material should also have a certain tensile strength. The lithium ion battery will release or absorb heat during the reaction, and the diaphragm will respond accordingly. Swelling and shrinking, if the tensile strength of the diaphragm is not enough, it will cause the diaphragm to break and cause a short circuit.
- the performance of the separator determines the interface structure of the battery, the retention of the electrolyte, and the internal resistance of the battery, which in turn affects the key performance of the battery, such as the capacity, cycle performance, and charge and discharge current density. Therefore, the performance of the separator directly affects the overall performance of the battery.
- the diaphragm is under pressure between the positive and negative electrodes and is immersed in the electrolyte for a long time, so the wet compression performance of the diaphragm is very important.
- most of the current researches focus on the tensile and compressive properties of dry-state separators of lithium-ion batteries, and there is a lack of research on the separator's wet-state compression properties.
- the purpose of the present invention is to provide a clamp and a test method for the wet compression test of a lithium ion battery separator in view of the above-mentioned shortcomings of the prior art.
- a fixture suitable for testing the wet compression performance of the film is designed. The characteristic is that the existence of the liquid is fully considered, and how to discharge the liquid reasonably during the compression process, so as not to interfere with the experimental results.
- a fixture for the wet compression test of the lithium ion battery diaphragm comprising: an indenter and an indenter matching the shape and size of the indenter;
- the indenter includes a cylinder, and the center of the upper end of the cylinder is provided with a first fixed fin for clamping on the tensile and compression testing machine;
- the pressure groove includes a columnar groove, and a second fixed fin for clamping on the tensile and compression testing machine is provided at the center of the lower end surface of the bottom of the columnar groove;
- the pressure head is embedded in the cylindrical groove where the lithium ion battery diaphragm is placed.
- a vertical groove for discharging air when the pressure head is pressed down is distributed on the inner side of the column wall of the columnar groove.
- the bottom end of the column wall of the columnar groove is provided with a liquid outlet groove for squeezing and discharging the electrolyte liquid during compression.
- a liquid storage tank is ringed on the outside of the bottom of the column wall of the columnar groove, and the electrolyte discharged during compression is introduced into the liquid storage tank through the liquid outlet groove on the column wall of the columnar groove.
- 4 vertical grooves are evenly distributed on the inner side of the column wall of the columnar groove.
- the groove shape of the liquid outlet groove includes at least one of a circular shape, an oval shape and a polygon shape.
- the groove type of the liquid storage tank is a continuous ring groove, which is used to temporarily store the electrolyte that is discharged during the compression test, and it needs to be sucked away with a straw and handled properly.
- the present invention also provides a test method of a clamp for wet compression test of lithium ion battery diaphragm, including the following steps:
- the number of layers of the lithium ion battery separator in step 2) is 30-50.
- the lithium ion battery electrolyte in step 3) is LiPF 6 /EC+DMC+DEC, wherein the concentration of LiPF 6 is 1 mol/L, and the volume ratio of the three solvents EC, DMC and DEC is 1:1:1.
- the present invention has the following advantages and beneficial effects:
- the groove is designed, taking into account the discharge of electrolyte during the compression process
- the present invention provides a fixture for wet compression test of lithium ion battery diaphragm and its test method.
- Figure 1 is a schematic diagram of a diaphragm wet compression fixture
- Figure 2 is the indenter in the fixture
- Figure 3 shows the pressure groove in the fixture.
- This embodiment provides a fixture for the wet compression test of a lithium ion battery diaphragm and a test method thereof.
- the clamp includes the following components: an indenter 1 and an indenter 2 with matching indenter shape and size.
- the indenter 2 includes a cylinder 3; the center of the upper end of the cylinder 3 is provided with a first fixed fin 4 for clamping on a tensile and compression testing machine.
- the pressure groove 2 includes a cylindrical groove 5, and a second fixing fin 6 for clamping on the tensile and compression testing machine is provided at the center of the lower end of the bottom of the cylindrical groove 5 for clamping on the tensile tester.
- the extension compression testing machine On the extension compression testing machine; on the inner side of the column wall of the cylindrical groove 5, there are 4 vertical grooves 7 for discharging air when the indenter is pressed down, which are used to discharge air when the indenter is pressed down;
- the bottom end of the column wall is evenly distributed with 4 quadrilateral outlet grooves 8 for the extrusion and discharge of the electrolyte liquid when the compression is in progress;
- the cylindrical groove 5 is surrounded by a liquid storage tank 9 outside the bottom of the column wall, when the compression is in progress
- the discharged electrolyte is introduced into the storage tank 9 through the outlet tank 8 on the column wall of the cylindrical groove 5 for temporary storage of the electrolyte discharged during the compression test. It needs to be sucked away with a straw and properly disposed of .
- the test method includes the following steps:
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Abstract
A chuck for lithium ion battery diaphragm wet compression test and a test method thereof, relating to the fields of energy sources and lithium ion battery diaphragm compression performance test. The chuck comprises an indenter (1) and a tank (2) matching the indenter (1) in shape and size; the indenter (1) comprises a cylinder (3), and a first fixed fin (4) clamped on a tensile compression test machine is arranged at the center of the upper end surface of the cylinder (3); the tank (2) comprises a cylindrical recess (5), and a second fixed fin (6) clamped on the tensile compression test machine is arranged at the center of the lower end surface of the bottom of the cylindrical recess (5); the cylinder (3) of the indenter (1) is embedded into the cylindrical recess (5) in which a lithium ion battery diaphragm is provided. The test method comprises steps such as placing a sample, adding an electrolyte in a dropwise manner, and performing compression. The provided chuck and test method are suitable for compression performance test by wetting a lithium ion battery diaphragm in an electrolyte, and facilitate researching a compression mechanical behavior of a diaphragm in a real environment.
Description
本发明属于压缩性能测试领域，涉及锂离子电池隔膜湿态压缩性能领域，具体涉及一种用于锂离子电池隔膜湿态压缩试验的夹具及其试验方法。The invention belongs to the field of compression performance testing, relates to the field of wet compression performance of lithium ion battery diaphragms, and in particular relates to a clamp for wet compression test of lithium ion battery diaphragms and a test method thereof.
锂离子电池作为当下流行的能源装置，其重要组成之一的隔膜对电池使用的安全有关键的作用。由于锂离子电池是绿色环保型无污染的二次电池，符合当今各国能源环保方面的发展需求，在各行各业的使用量正在迅速增加。锂离子电池电芯主要由正极材料、负极材料、电解液和隔膜组成，作为锂电池的关键材料，隔膜在其中扮演着电子隔绝的作用，阻止正负极直接接触，允许电解液中锂离子自由通过，同时，隔膜对于保障电池的安全运行也起至关重要的作用。在特殊情况下，如事故、刺穿、电池滥用等，发生隔膜局部破损从而造成正负极的直接接触，从而引发剧烈的电池反应造成电池的起火***。因此，为了提高锂离子电池的安全性，保证电池的安全平稳运行，隔膜必须满足以下几个条件：(1)化学稳定性：不与电解质、电极材料发生反应；(2)浸润性：与电解质易于浸润且不伸长、不收缩；(3)热稳定性：耐受高温，具有较高的熔断隔离性；(4)孔隙率：较高的孔隙率以满足离子导电的需求；(5)机械性能：隔膜在电池结构及充放电反应过程中需要具有一定的机械强度，隔膜的一个重要作用是将正负极反应隔开，如果隔膜皱缩或破裂导致电解液渗透，就会发生电池短路，具有很大的安全隐患，因此隔膜需要有一定的力学强度和韧性，另外，隔膜材料也应该具有一定的拉伸强度，锂离子电池在反应过程中会放出或吸收热量，隔膜会发生相应的涨缩，如果隔膜的拉伸强度不够，就会造成隔膜破损，也会导致短路发生。Lithium-ion battery is a popular energy device, and one of its important components is the diaphragm, which plays a key role in the safety of battery use. Since lithium-ion batteries are environmentally friendly and pollution-free secondary batteries, they meet the development needs of energy and environmental protection in various countries today, and their use in various industries is rapidly increasing. Lithium-ion battery cells are mainly composed of positive electrode material, negative electrode material, electrolyte and diaphragm. As the key material of lithium battery, the diaphragm acts as an electronic isolation, preventing direct contact between the positive and negative electrodes and allowing lithium ions in the electrolyte to be free At the same time, the diaphragm also plays a vital role in ensuring the safe operation of the battery. Under special circumstances, such as accidents, punctures, battery abuse, etc., partial breakage of the diaphragm occurs, causing direct contact between the positive and negative electrodes, which triggers a violent battery reaction and causes a fire and explosion of the battery. Therefore, in order to improve the safety of lithium-ion batteries and ensure the safe and stable operation of the battery, the diaphragm must meet the following conditions: (1) Chemical stability: no reaction with electrolyte and electrode materials; (2) wettability: with electrolyte Easy to infiltrate without elongation or shrinkage; (3) Thermal stability: resistant to high temperature, with high fusing isolation; (4) Porosity: higher porosity to meet the needs of ion conductivity; (5) Mechanical properties: The separator needs to have a certain mechanical strength in the battery structure and the process of charging and discharging. An important function of the separator is to separate the positive and negative reactions. If the separator shrinks or ruptures and causes the electrolyte to penetrate, a battery short circuit will occur. , Has a great safety hazard, so the diaphragm needs to have certain mechanical strength and toughness. In addition, the diaphragm material should also have a certain tensile strength. The lithium ion battery will release or absorb heat during the reaction, and the diaphragm will respond accordingly. Swelling and shrinking, if the tensile strength of the diaphragm is not enough, it will cause the diaphragm to break and cause a short circuit.
隔膜的性能决定了电池的界面结构、电解质的保持性和电池的内阻等，进而影响电池的容量、循环性能、充放电电流密度等关键性能。所以，隔膜性能的优劣直接影响了电池的总和性能。The performance of the separator determines the interface structure of the battery, the retention of the electrolyte, and the internal resistance of the battery, which in turn affects the key performance of the battery, such as the capacity, cycle performance, and charge and discharge current density. Therefore, the performance of the separator directly affects the overall performance of the battery.
隔膜在正负极之间，承受压力，并长期浸润在电解液中，所以隔膜的湿态压缩性能是十分重要的。但是目前大部分研究都是针对锂离子电池干态隔膜的拉伸与压缩性能进行研究，缺乏对隔膜浸润电解液，即湿态压缩性能的研究。The diaphragm is under pressure between the positive and negative electrodes and is immersed in the electrolyte for a long time, so the wet compression performance of the diaphragm is very important. However, most of the current researches focus on the tensile and compressive properties of dry-state separators of lithium-ion batteries, and there is a lack of research on the separator's wet-state compression properties.
发明概述Summary of the invention
问题的解决方案The solution to the problem
本发明的目的是针对上述现有技术的不足，提供了一种用于锂离子电池隔膜湿态压缩试验的夹具及其试验方法。设计了一种适用于测试薄膜湿态压缩性能的夹具，特点是充分考虑了液体的存在，考虑了如何在压缩过程中合理地排放液体，以免对实验结果造成干扰。The purpose of the present invention is to provide a clamp and a test method for the wet compression test of a lithium ion battery separator in view of the above-mentioned shortcomings of the prior art. A fixture suitable for testing the wet compression performance of the film is designed. The characteristic is that the existence of the liquid is fully considered, and how to discharge the liquid reasonably during the compression process, so as not to interfere with the experimental results.
本发明的目的可以通过如下技术方案实现。The purpose of the present invention can be achieved through the following technical solutions.
一种用于锂离子电池隔膜湿态压缩试验的夹具，包括：压头以及与压头形状和尺寸相匹配的压槽；A fixture for the wet compression test of the lithium ion battery diaphragm, comprising: an indenter and an indenter matching the shape and size of the indenter;
所述压头包括圆柱体，圆柱体上端面中心设置有用于装夹在拉伸压缩试验机上的第一固定翅；The indenter includes a cylinder, and the center of the upper end of the cylinder is provided with a first fixed fin for clamping on the tensile and compression testing machine;
所述压槽包括柱状凹槽，柱状凹槽的底部下端面中心处设置有用于装夹在拉伸压缩试验机上的第二固定翅；The pressure groove includes a columnar groove, and a second fixed fin for clamping on the tensile and compression testing machine is provided at the center of the lower end surface of the bottom of the columnar groove;
所述压头嵌入置有锂离子电池隔膜的柱状凹槽内。The pressure head is embedded in the cylindrical groove where the lithium ion battery diaphragm is placed.
优选地，所述柱状凹槽的柱壁内侧上分布有用于压头下压时排出空气的竖直沟槽。Preferably, a vertical groove for discharging air when the pressure head is pressed down is distributed on the inner side of the column wall of the columnar groove.
优选地，所述柱状凹槽的柱壁最底端分布有出液槽，用于当压缩进行时电解液液体的挤出排放。Preferably, the bottom end of the column wall of the columnar groove is provided with a liquid outlet groove for squeezing and discharging the electrolyte liquid during compression.
优选地，在所述柱状凹槽的柱壁底部外侧环设储液槽，当压缩进行时排放的电解液通过柱状凹槽柱壁上的出液槽引入储液槽内。Preferably, a liquid storage tank is ringed on the outside of the bottom of the column wall of the columnar groove, and the electrolyte discharged during compression is introduced into the liquid storage tank through the liquid outlet groove on the column wall of the columnar groove.
优选地，所述柱状凹槽的柱壁内侧上均匀分布4根竖直沟槽。Preferably, 4 vertical grooves are evenly distributed on the inner side of the column wall of the columnar groove.
优选地，所述柱状凹槽的柱壁最底端均匀分布的4个出液槽，所述出液槽的槽型包括圆形、椭圆形及多边形中的至少一种。Preferably, there are 4 liquid outlet grooves evenly distributed at the bottom end of the column wall of the cylindrical groove, and the groove shape of the liquid outlet groove includes at least one of a circular shape, an oval shape and a polygon shape.
优选地，所述储液槽的槽型为连续的圆环槽，用于暂时储存进行压缩试验时被排挤出的电解液，需要用吸管将之吸走并进行妥善处理。Preferably, the groove type of the liquid storage tank is a continuous ring groove, which is used to temporarily store the electrolyte that is discharged during the compression test, and it needs to be sucked away with a straw and handled properly.
本发明还提供了一种用于锂离子电池隔膜湿态压缩试验的夹具的试验方法，包括以下步骤：The present invention also provides a test method of a clamp for wet compression test of lithium ion battery diaphragm, including the following steps:
1)将压头与压槽分别装夹在拉伸-压缩试验机的夹紧夹具上，并进行对准；1) Clamp the indenter and the pressure groove on the clamping fixture of the tensile-compression testing machine, and align them;
2)将与柱状凹槽尺寸相匹配的锂离子电池隔膜放置于柱状凹槽内；2) Place the lithium-ion battery diaphragm that matches the size of the cylindrical groove in the cylindrical groove;
3)向柱状凹槽内注入锂离子电池电解液，确保隔膜被电解液浸润；3) Inject lithium-ion battery electrolyte into the cylindrical groove to ensure that the diaphragm is wetted by the electrolyte;
4)对隔膜进行预压紧，以排出隔膜层间的空气，然后开始压缩试验；4) Pre-compact the diaphragm to discharge the air between the diaphragm layers, and then start the compression test;
5)试验结束后，排出储液槽的电解液。5) After the test, drain the electrolyte from the storage tank.
优选地，步骤2)中所述锂离子电池隔膜的层数为30-50。Preferably, the number of layers of the lithium ion battery separator in step 2) is 30-50.
优选地，步骤3)中锂离子电池电解液为LiPF
6/EC+DMC+DEC，其中LiPF
6的浓度为1mol/L，溶剂EC、DMC和DEC三者的体积比为1∶1∶1。
Preferably, the lithium ion battery electrolyte in step 3) is LiPF 6 /EC+DMC+DEC, wherein the concentration of LiPF 6 is 1 mol/L, and the volume ratio of the three solvents EC, DMC and DEC is 1:1:1.
发明的有益效果The beneficial effects of the invention
本发明与现有技术相比，具有如下优点和有益效果：Compared with the prior art, the present invention has the following advantages and beneficial effects:
1、考虑了电解液的存在对隔膜压缩性能的影响；1. Consider the influence of the presence of electrolyte on the compression performance of the diaphragm;
2、设计沟槽，考虑了电解液在压缩过程中的排放；2. The groove is designed, taking into account the discharge of electrolyte during the compression process;
3、本发明提供了一种用于锂离子电池隔膜湿态压缩试验的夹具及其试验方法。3. The present invention provides a fixture for wet compression test of lithium ion battery diaphragm and its test method.
对附图的简要说明Brief description of the drawings
图1是隔膜湿态压缩夹具示意图；Figure 1 is a schematic diagram of a diaphragm wet compression fixture;
图2是夹具中的压头；Figure 2 is the indenter in the fixture;
图3是夹具中的压槽。Figure 3 shows the pressure groove in the fixture.
发明实施例Invention embodiment
下面结合实施例及附图对本发明作进一步详细的描述，但本发明的实施方式不 限于此。The present invention will be further described in detail below in conjunction with the examples and drawings, but the implementation of the present invention is not limited to this.
实施例：Examples:
本实施例提供了一种用于锂离子电池隔膜湿态压缩试验的夹具及其试验方法。This embodiment provides a fixture for the wet compression test of a lithium ion battery diaphragm and a test method thereof.
如附图1所示，所述夹具包括以下组成：压头1及压头形状和尺寸相匹配的压槽2。As shown in FIG. 1, the clamp includes the following components: an indenter 1 and an indenter 2 with matching indenter shape and size.
其中，如附图2所示，压头2包括一个圆柱体3；圆柱体3上端面中心设置第一固定翅4，用于装夹在拉伸压缩试验机上。Wherein, as shown in FIG. 2, the indenter 2 includes a cylinder 3; the center of the upper end of the cylinder 3 is provided with a first fixed fin 4 for clamping on a tensile and compression testing machine.
如附图3所示，压槽2包括柱状凹槽5，柱状凹槽5的底部下端面中心处设置有用于装夹在拉伸压缩试验机上的第二固定翅6，用于装夹在拉伸压缩试验机上；柱状凹槽5的柱壁内侧上均匀分布有4个用于压头下压时排出空气的竖直沟槽7，用于压头下压时排出空气；柱状凹槽5的柱壁最底端均匀分布有4个四边形出液槽8，用于当压缩进行时电解液液体的挤出排放；柱状凹槽5的柱壁底部外侧环设储液槽9，当压缩进行时排放的电解液通过柱状凹槽5柱壁上的出液槽8引入储液槽9内，用于暂时储存进行压缩试验时被排挤出的电解液，需要用吸管将之吸走并进行妥善处理。As shown in Fig. 3, the pressure groove 2 includes a cylindrical groove 5, and a second fixing fin 6 for clamping on the tensile and compression testing machine is provided at the center of the lower end of the bottom of the cylindrical groove 5 for clamping on the tensile tester. On the extension compression testing machine; on the inner side of the column wall of the cylindrical groove 5, there are 4 vertical grooves 7 for discharging air when the indenter is pressed down, which are used to discharge air when the indenter is pressed down; The bottom end of the column wall is evenly distributed with 4 quadrilateral outlet grooves 8 for the extrusion and discharge of the electrolyte liquid when the compression is in progress; the cylindrical groove 5 is surrounded by a liquid storage tank 9 outside the bottom of the column wall, when the compression is in progress The discharged electrolyte is introduced into the storage tank 9 through the outlet tank 8 on the column wall of the cylindrical groove 5 for temporary storage of the electrolyte discharged during the compression test. It needs to be sucked away with a straw and properly disposed of .
所述试验方法包括以下步骤：The test method includes the following steps:
1)将压头1与压槽2分别装夹在拉伸-压缩试验机上，并进行对准；1) Clamp the indenter 1 and the indenter 2 on the tensile-compression testing machine respectively, and align them;
2)将与柱状凹槽5尺寸相匹配的40层锂离子电池隔膜试样放置于柱状凹槽5内；2) Place a 40-layer lithium ion battery diaphragm sample matching the size of the cylindrical groove 5 in the cylindrical groove 5;
3)向柱状凹槽5内注入锂离子电池电解液LiPF
6/EC+DMC+DEC，其中LiPF
6的浓度为1mol/L，溶剂EC、DMC和DEC三者的体积比为1∶1∶1，确保隔膜被电解液浸润；
3) Inject lithium-ion battery electrolyte LiPF 6 /EC+DMC+DEC into the cylindrical groove 5, where the concentration of LiPF 6 is 1 mol/L, and the volume ratio of the solvents EC, DMC and DEC is 1:1:1 , To ensure that the diaphragm is wetted by the electrolyte;
4)对隔膜试样进行预压紧，以排出隔膜试样层间的空气，然后开始压缩试验；4) Pre-compact the diaphragm sample to exhaust the air between the layers of the diaphragm sample, and then start the compression test;
5)试验结束后，排出储液槽9的电解液。5) After the test is over, drain the electrolyte in the reservoir 9.
以上所述，仅为本发明专利较佳的实施例，但本发明专利的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明专利所公开的范围内，根据本发明专利的技术方案及其发明专利构思加以等同替换或改变，都属于本发明专 利的保护范围。The above are only preferred embodiments of the patent of the present invention, but the scope of protection of the patent of the present invention is not limited to this. Anyone familiar with the technical field within the scope of the patent of the present invention, according to the patent of the present invention The technical solution and its invention patent concept are equivalently replaced or changed, all belong to the protection scope of the invention patent.
Claims (10)
- 一种用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于包括：压头(1)以及与压头形状和尺寸相匹配的压槽(2)；A clamp for wet compression test of lithium ion battery diaphragm, which is characterized by comprising: an indenter (1) and an indenter (2) matching the shape and size of the indenter;所述压头(1)包括圆柱体(3)，圆柱体(3)上端面中心设置有用于装夹在拉伸压缩试验机上的第一固定翅(4)；The indenter (1) includes a cylinder (3), and the center of the upper end of the cylinder (3) is provided with a first fixed fin (4) for clamping on a tensile and compression testing machine;所述压槽(2)包括柱状凹槽(5)，柱状凹槽(5)的底部下端面中心处设置有用于装夹在拉伸压缩试验机上的第二固定翅(6)；The pressure groove (2) includes a cylindrical groove (5), and a second fixed fin (6) for clamping on the tensile and compression testing machine is provided at the center of the bottom lower end surface of the cylindrical groove (5);所述压头(1)的圆柱体(3)嵌入置有锂离子电池隔膜的柱状凹槽(5)内。The cylinder (3) of the pressure head (1) is embedded in the cylindrical groove (5) where the lithium ion battery diaphragm is placed.
- 根据权利要求1所述的用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于，所述柱状凹槽(5)的柱壁内侧上分布有用于压头下压时排出空气的竖直沟槽(7)。The clamp for wet compression test of lithium-ion battery diaphragm according to claim 1, characterized in that, on the inner side of the column wall of the columnar groove (5) is distributed a vertical for exhausting air when the pressure head is pressed down. Groove (7).
- 根据权利要求1所述的用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于，所述柱状凹槽(5)的柱壁最底端分布有出液槽(8)，用于当压缩进行时电解液的挤出排放。The clamp for wet compression test of lithium ion battery diaphragm according to claim 1, characterized in that, the bottom end of the column wall of the columnar groove (5) is distributed with an outlet groove (8) for when Extrusion and discharge of electrolyte during compression.
- 根据权利要求1所述的用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于，在所述柱状凹槽(5)的柱壁底部外侧环设储液槽(9)，当压缩进行时排放的电解液通过柱状凹槽(5)柱壁上的出液槽(8)引入储液槽(9)内。The clamp for wet compression test of lithium ion battery diaphragm according to claim 1, characterized in that, a liquid storage tank (9) is ringed outside the bottom of the column wall of the columnar groove (5), and when the compression is performed The electrolyte discharged at the time is introduced into the liquid storage tank (9) through the liquid outlet groove (8) on the column wall of the cylindrical groove (5).
- 根据权利要求2所述的用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于，所述柱状凹槽(5)的柱壁内侧上均匀分布4根竖直沟槽(7)。The clamp for wet compression test of lithium ion battery diaphragm according to claim 2, characterized in that, 4 vertical grooves (7) are evenly distributed on the inner side of the column wall of the columnar groove (5).
- 根据权利要求3所述的用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于，所述柱状凹槽(5)的柱壁最底端均匀分布4个出液槽(8)，所述出液槽(8)的槽型包括圆形、椭圆形、及多边形中的至少一种。The clamp for wet compression test of lithium ion battery diaphragm according to claim 3, characterized in that the bottom end of the column wall of the columnar groove (5) is evenly distributed with 4 outlet grooves (8), so The groove type of the liquid groove (8) includes at least one of a circle, an ellipse, and a polygon.
- 根据权利要求4所述的用于锂离子电池隔膜湿态压缩试验的夹具，其特征在于，所述储液槽(9)的槽型为连续的圆环槽。The clamp for wet compression test of lithium ion battery diaphragm according to claim 4, characterized in that the groove type of the liquid storage tank (9) is a continuous annular groove.
- 一种利用根据权利要求1所述的用于锂离子电池隔膜湿态压缩试验的夹具的试验方法，其特征在于，包括以下步骤：A test method using the clamp for wet compression test of lithium ion battery separator according to claim 1, characterized in that it comprises the following steps:1)将压头(1)与压槽(2)分别装夹在拉伸-压缩试验机上，并进行对准；1) Clamp the indenter (1) and the indenter (2) on the tensile-compression testing machine respectively, and align them;2)将与柱状凹槽(5)尺寸相匹配的锂离子电池隔膜放置于柱状凹槽(5)内；2) Place the lithium-ion battery diaphragm matching the size of the cylindrical groove (5) in the cylindrical groove (5);3)向柱状凹槽(5)内注入锂离子电池电解液，确保所述隔膜被电解液浸润；3) Inject lithium-ion battery electrolyte into the cylindrical groove (5) to ensure that the diaphragm is infiltrated by the electrolyte;4)对隔膜进行预压紧，以排出隔膜层间的空气，然后开始压缩试验；4) Pre-compact the diaphragm to discharge the air between the diaphragm layers, and then start the compression test;5)试验结束后，排出储液槽(9)的电解液。5) After the test, drain the electrolyte from the storage tank (9).
- 根据权利要求8所述的利用用于锂离子电池隔膜湿态压缩试验的夹具的试验方法，其特征在于，步骤2)中所述锂离子电池隔膜的层数为30-50。The test method using a clamp for wet compression test of lithium ion battery separator according to claim 8, wherein the number of layers of the lithium ion battery separator in step 2) is 30-50.
- 根据权利要求8所述的利用用于锂离子电池隔膜湿态压缩试验的夹具的试验方法，其特征在于，步骤3)中锂离子电池电解液为LiPF 6/EC+DMC+DEC，其中LiPF 6的浓度为1mol/L，溶剂EC、DMC和DEC三者的体积比为1∶1∶1。 The test method using a clamp for wet compression test of lithium ion battery separators according to claim 8, wherein the electrolyte of the lithium ion battery in step 3) is LiPF 6 /EC+DMC+DEC, wherein LiPF 6 The concentration is 1mol/L, and the volume ratio of the solvents EC, DMC and DEC is 1:1:1.
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| JPH06331521A (en) * | 1993-05-24 | 1994-12-02 | Sumitomo Metal Mining Co Ltd | Method and apparatus for measuring tensile strength of fragile solid material and the like |
| CN201803930U (en) * | 2010-09-19 | 2011-04-20 | 熊利军 | Tester for wet state pressure maintaining performance of AGM separator |
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| CN102359911A (en) * | 2011-07-31 | 2012-02-22 | 风帆股份有限公司 | Electrode group pressure and acid absorption quantity measurement method for absorptive glass mat (AGM) lead-acid storage battery |
| CN109030173A (en) * | 2018-07-10 | 2018-12-18 | 华南理工大学 | Test the infiltration type device and method of lithium ion battery separator hygrometric state puncture strength |
| CN109738281A (en) * | 2019-02-28 | 2019-05-10 | 华南理工大学 | Fixture and its test method for lithium ion battery separator hygrometric state compression test |
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| CN108709804A (en) * | 2018-06-22 | 2018-10-26 | 华南理工大学 | A kind of device and its test method for lignin tension test |
| CN209764575U (en) * | 2019-02-28 | 2019-12-10 | 华南理工大学 | Clamp for lithium ion battery diaphragm wet compression test |
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| JPH06331521A (en) * | 1993-05-24 | 1994-12-02 | Sumitomo Metal Mining Co Ltd | Method and apparatus for measuring tensile strength of fragile solid material and the like |
| CN201803930U (en) * | 2010-09-19 | 2011-04-20 | 熊利军 | Tester for wet state pressure maintaining performance of AGM separator |
| CN201983985U (en) * | 2010-12-28 | 2011-09-21 | 中材科技股份有限公司 | Device for measuring thickness and pressure of multi-component fiber battery separator under moist state |
| CN102359911A (en) * | 2011-07-31 | 2012-02-22 | 风帆股份有限公司 | Electrode group pressure and acid absorption quantity measurement method for absorptive glass mat (AGM) lead-acid storage battery |
| CN109030173A (en) * | 2018-07-10 | 2018-12-18 | 华南理工大学 | Test the infiltration type device and method of lithium ion battery separator hygrometric state puncture strength |
| CN109738281A (en) * | 2019-02-28 | 2019-05-10 | 华南理工大学 | Fixture and its test method for lithium ion battery separator hygrometric state compression test |
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