CN102901688A - Method for detecting liquid absorption rate of battery diaphragm - Google Patents
Method for detecting liquid absorption rate of battery diaphragm Download PDFInfo
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- CN102901688A CN102901688A CN2012103880663A CN201210388066A CN102901688A CN 102901688 A CN102901688 A CN 102901688A CN 2012103880663 A CN2012103880663 A CN 2012103880663A CN 201210388066 A CN201210388066 A CN 201210388066A CN 102901688 A CN102901688 A CN 102901688A
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Abstract
The invention discloses a method for detecting the liquid absorption rate of a battery diaphragm. The method comprises the following steps of: (1) cutting out a battery diaphragm to obtain three samples; (2) weighing the samples and recording the weights of the samples; (3) soaking the samples in soaking liquor; (4) treating the soaked samples; (5) weighing the treated samples and recording the weights of the treated samples; and (6) calculating the liquid absorption rate of the samples. The step for treating the soaked sample comprises the following substeps of: placing each sample between two layers of filter paper and then placing the filter paper sandwiched with the corresponding sample on a flat plate; flatly pressing the filter paper sandwiched with the corresponding sample by a flat plate with the weight ranging from 50 grams to 200 grams; and enabling the soaking liquor on the surface of each sample to be adsorbed by the corresponding filter paper for a constant time. In the treating process, the environment temperature is room temperature, air motion is not obvious, each treated sample is weighed and then is placed on a balance, and after the balance is balanced and keeps stable, the weight displayed on the balance is the weight of the corresponding sample and then is recorded. After the three samples are respectively soaked, metered and calculated, the average value of the three samples is the sample soaking rate.
Description
Technical field:
The present invention relates to a kind of detection method of microporous membrane material pick up, particularly a kind of detection method of battery diaphragm pick up.
Background technology:
Barrier film is as the important component part of liquid lithium ion secondary cell, in battery, play and prevent the both positive and negative polarity short circuit, the effect of ion transportation passage is provided in charge and discharge process simultaneously, its performance has determined interfacial structure, internal resistance of battery etc., directly affect the characteristics such as capacity, cycle performance and security performance of battery, the barrier film of excellent performance has important effect to the combination property that improves lithium ion battery.Therefore, require battery diaphragm to have high ionic conductance and physical strength, suitable pore structure and electrochemical stability etc.The main evaluating of membrane properties has three parts: 1, architectural characteristic comprises pore size and pore size distribution, porosity, gas penetration potential etc.; 2, mechanical characteristic comprises pulling strengrth, puncture intensity etc.; 3, physicochemical property comprises wellability and wetting velocity, chemical stability, thermal stability, resistance, self-closing performance etc.
The ionic conductivity of battery is one of most important factor that affects battery performance.Ionic conductivity is high, illustrates that conductive ion concentration is high, and the ability of battery conduction current is also just stronger.The increase of ionic conductivity can improve the charge-discharge performance of battery.Barrier film preferably wellability is conducive to affine with between the electrolytic solution of barrier film, enlarges the surface of contact of barrier film and electrolytic solution, thus the increase ionic conductivity.The bad meeting of the wellability of barrier film increases the resistance of barrier film and battery, affects cycle performance and the efficiency for charge-discharge of battery.Wellability can be characterized by the pick up of barrier film, has reflected to a certain extent the quality of membranes pores structure.Pick up is higher, illustrates that barrier film has higher porosity and wellability preferably, and the amount of Electolyte-absorptive is higher in the unit volume, and the ionic conductivity of battery is also just higher, and then the charge-discharge performance of battery also can be better.Therefore the pick up of test battery barrier film has extremely important meaning for its practical application.
The defective that existing detection method exists is that each operation steps does not have strict working specification definition in the testing process, affects the accuracy of testing result.
Summary of the invention:
The object of the invention provides the accurately detection method of battery diaphragm pick up of a kind of testing result.The technical scheme that realizes the object of the invention is, a kind of detection method of battery diaphragm pick up, it comprises (1) intercepting sample, (2) sample is weighed and noted down, (3) sample infiltrates in infiltrate, (4) sample that infiltrates is processed, (5) sample after processing is weighed, and note down, (6) pick up of calculating sample, it is characterized in that: described infiltration sample is processed and is, is placed on the flat board after placing sample between the two layers of filter paper, and the flat-plate compressed of the arbitrary weight between weight 50-200 grams is flattened at the above-mentioned filter paper that accompanies sample, the constant time that infiltrate on the specimen surface is fallen by Adsorption of Filter Paper, environment temperature in the reason process is room temperature herein, and without obvious Air Flow, described sample after processing is weighed, sample is placed on the balance, behind Balance, need to keep stable rear shown weight to be as the criterion, and note down.Described sample is three, and after infiltrating respectively, measure and calculating, getting its mean value is sample infiltration rate.The present invention has the high remarkable advantage of testing result accuracy compared with the prior art.
Embodiment:
The relatively poor defective of testing result accuracy that the present invention exists in order to solve existing detection method only time, environment, the infiltrate of use, the instrument of the operation of each detecting step are made strict requirement, and detecting step does not change.
Detecting step of the present invention is as follows:
1. at barrier film to be measured shape and three samples of specification intercepting by design.Selected specimen shape should conveniently intercept and reference area, can be circle or rectangle, and its size is definite by sample size, and sample of the present invention is rectangle, area S≤(100 * 100) mm
2
2. take by weighing the initial mass M of sample
1And note down,
3. said sample is put into infiltrate and infiltrate, environment temperature is room temperature, and infiltrating time exists
Choose arbitrarily a set time in 30-90 minutes, infiltrate is electrolytic solution or alcohol or the organic solution that can be absorbed by barrier film,
4. the sample after the above-mentioned infiltration is taken out from soaking vessel and be handled as follows: environment temperature
Be room temperature, without obvious Air Flow, sample places between the two layers of filter paper, be the flat board of the arbitrary quality in 50-200 grams greater than Area of Sample and quality with area, be covered in and sample is flattened and keep constant time in 1-15 seconds, the infiltrate of specimen surface is adsorbed
5. the sample after the above-mentioned processing is weighed, treating that a day chessboard is under the equilibrium state needs stable a moment
Rear shown mass M 2 is also noted down,
6. calculate the pick up of sample: formula is that (in M2-M1)/S formula: M1 is that sample is initial to n=
Quality, M2 is the quality of saturated imbibition state, S is Area of Sample, the Wei ㎡ of unit, n is the sample pick up.
The present invention is total to five batches of test samples, makes three samples for every batch, and data see the following form:
The barrier film pick up detects tables of data:
Can be found out by top detection example, the pick up of batch 4 barrier films is optimum, and batch 1 takes second place, and batches 5 the poorest.Use the inventive method to detect barrier film pick up high conformity, carry out this detection, can assess wellability and the porosity of barrier film, and then the ionic conductivity of preliminary electrolytic cell and the charge-discharge performance of battery.
Claims (2)
1. the detection method of a battery diaphragm pick up, it comprises (1) intercepting sample, (2) sample is weighed and noted down, (3) sample infiltrates in infiltrate, (4) sample that infiltrates is processed, (5) sample after processing is weighed, and note down, (6) calculate the pick up of sample, and it is characterized in that: described infiltration sample is processed and is, be placed on the flat board after placing sample between the two layers of filter paper, the flat-plate compressed of the arbitrary weight between weight 50-200 grams is flattened at the above-mentioned filter paper that accompanies sample, and the constant time that the infiltrate on the specimen surface is fallen by Adsorption of Filter Paper, the environment temperature in the reason process is room temperature herein, and without obvious Air Flow, described sample after processing is weighed, sample is placed on the balance, behind Balance, need to keep stable rear shown weight to be as the criterion, and note down.
2. the detection method of a kind of battery diaphragm pick up as claimed in claim 1, it is characterized in that: described sample is three, after infiltrating respectively, measure and calculating, getting its mean value is sample infiltration rate.
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| CN2012103880663A CN102901688A (en) | 2012-10-15 | 2012-10-15 | Method for detecting liquid absorption rate of battery diaphragm |
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| CN2012103880663A CN102901688A (en) | 2012-10-15 | 2012-10-15 | Method for detecting liquid absorption rate of battery diaphragm |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528911A (en) * | 2013-09-29 | 2014-01-22 | 奇瑞汽车股份有限公司 | Experimental method for testing liquid absorption rate of isolating membrane of lithium ion secondary battery |
| CN103926185A (en) * | 2014-04-24 | 2014-07-16 | 合肥国轩高科动力能源股份公司 | Device and method for detecting liquid absorption rate of lithium-ion battery separator |
| CN104048892A (en) * | 2013-12-23 | 2014-09-17 | 深圳市星源材质科技股份有限公司 | Method for testing porosity of composite diaphragm |
| CN104062199A (en) * | 2014-07-10 | 2014-09-24 | 深圳市星源材质科技股份有限公司 | Test method and test device for liquid absorption rate of macromolecular microporous diaphragm |
| CN105212280A (en) * | 2015-11-04 | 2016-01-06 | 卓尔悦（常州）电子科技有限公司 | Cell apparatus, electronic cigarette and control method thereof |
| CN105784563A (en) * | 2016-03-17 | 2016-07-20 | 东莞市创明电池技术有限公司 | Method for measuring seepage rate and retention capacity of pole pieces or diaphragms |
| CN106595823A (en) * | 2016-12-03 | 2017-04-26 | 合肥国轩高科动力能源有限公司 | Lithium ion battery maximum electrolyte injection volume quick evaluation method |
| CN106644806A (en) * | 2016-12-14 | 2017-05-10 | 合肥国轩高科动力能源有限公司 | Test device and test method for liquid absorption rate of lithium ion battery diaphragm |
| CN107271316A (en) * | 2017-06-27 | 2017-10-20 | 淄博君行电源技术有限公司 | The method for testing rare earth new power battery core pick up |
| CN107271317A (en) * | 2017-06-27 | 2017-10-20 | 淄博君行电源技术有限公司 | The method for testing rare earth new power negative plate expansion rate |
| CN110108591A (en) * | 2019-03-28 | 2019-08-09 | 合肥国轩高科动力能源有限公司 | A kind of evaluation method of cathode of lithium battery SBR absorbent |
| US11129415B2 (en) | 2015-11-04 | 2021-09-28 | Changzhou Jwei Intelligent Technology Co., Ltd. | Infiltration detecting apparatus, electronic cigarette, and method for controlling electronic cigarette |
| CN114252363A (en) * | 2021-12-09 | 2022-03-29 | 上海兰钧新能源科技有限公司 | Method for measuring pole piece infiltration liquid absorption amount |
-
2012
- 2012-10-15 CN CN2012103880663A patent/CN102901688A/en active Pending
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| 中华人民共和国国家发展和改革委员会: "《中华人民共和国轻工行业标准》", 16 June 2008 * |
| 李立 等: "二次锂电池用PVDF-HFP/SiO2复合聚合物隔膜的研究", 《北京化工大学学报》 * |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528911A (en) * | 2013-09-29 | 2014-01-22 | 奇瑞汽车股份有限公司 | Experimental method for testing liquid absorption rate of isolating membrane of lithium ion secondary battery |
| CN103528911B (en) * | 2013-09-29 | 2016-07-13 | 奇瑞新能源汽车技术有限公司 | The experimental test procedures of lithium rechargeable battery isolating membrane pick up |
| CN104048892A (en) * | 2013-12-23 | 2014-09-17 | 深圳市星源材质科技股份有限公司 | Method for testing porosity of composite diaphragm |
| CN103926185A (en) * | 2014-04-24 | 2014-07-16 | 合肥国轩高科动力能源股份公司 | Device and method for detecting liquid absorption rate of lithium-ion battery separator |
| CN103926185B (en) * | 2014-04-24 | 2016-03-02 | 合肥国轩高科动力能源有限公司 | The pick-up unit of lithium ion battery separator pick up, detection method |
| CN104062199B (en) * | 2014-07-10 | 2016-08-10 | 深圳市星源材质科技股份有限公司 | The method of testing of the pick up of high molecule micropore barrier film and test device |
| CN104062199A (en) * | 2014-07-10 | 2014-09-24 | 深圳市星源材质科技股份有限公司 | Test method and test device for liquid absorption rate of macromolecular microporous diaphragm |
| CN105212280A (en) * | 2015-11-04 | 2016-01-06 | 卓尔悦（常州）电子科技有限公司 | Cell apparatus, electronic cigarette and control method thereof |
| US11129415B2 (en) | 2015-11-04 | 2021-09-28 | Changzhou Jwei Intelligent Technology Co., Ltd. | Infiltration detecting apparatus, electronic cigarette, and method for controlling electronic cigarette |
| CN105784563A (en) * | 2016-03-17 | 2016-07-20 | 东莞市创明电池技术有限公司 | Method for measuring seepage rate and retention capacity of pole pieces or diaphragms |
| CN106595823A (en) * | 2016-12-03 | 2017-04-26 | 合肥国轩高科动力能源有限公司 | Lithium ion battery maximum electrolyte injection volume quick evaluation method |
| CN106595823B (en) * | 2016-12-03 | 2019-03-01 | 合肥国轩高科动力能源有限公司 | A kind of quick evaluating method of lithium ion battery maximum reservoir quantity |
| CN106644806A (en) * | 2016-12-14 | 2017-05-10 | 合肥国轩高科动力能源有限公司 | Test device and test method for liquid absorption rate of lithium ion battery diaphragm |
| CN107271316A (en) * | 2017-06-27 | 2017-10-20 | 淄博君行电源技术有限公司 | The method for testing rare earth new power battery core pick up |
| CN107271317A (en) * | 2017-06-27 | 2017-10-20 | 淄博君行电源技术有限公司 | The method for testing rare earth new power negative plate expansion rate |
| CN110108591A (en) * | 2019-03-28 | 2019-08-09 | 合肥国轩高科动力能源有限公司 | A kind of evaluation method of cathode of lithium battery SBR absorbent |
| CN114252363A (en) * | 2021-12-09 | 2022-03-29 | 上海兰钧新能源科技有限公司 | Method for measuring pole piece infiltration liquid absorption amount |
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Application publication date: 20130130 |