CN104181436A - Method for testing lithium battery diaphragm short-circuit resistant capacity - Google Patents
Method for testing lithium battery diaphragm short-circuit resistant capacity Download PDFInfo
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- CN104181436A CN104181436A CN201410398958.0A CN201410398958A CN104181436A CN 104181436 A CN104181436 A CN 104181436A CN 201410398958 A CN201410398958 A CN 201410398958A CN 104181436 A CN104181436 A CN 104181436A
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Abstract
The invention relates to the technical field of test methods, in particular to a method for testing lithium battery diaphragm short-circuit resistant capacity. The method includes the following specific steps that firstly, test tools of a diaphragm, a positive plate electrode, a negative plate electrode, electrolyte, a compression tester and a resistance tester are prepared; secondly, the diaphragm is placed between the positive plate electrode and the negative plate electrode, the diaphragm, the positive plate electrode and the negative plate electrode are tightly attached, the electrolyte is injected, two probes of the resistance tester are arranged on the a positive electrode and a negative electrode, and resistance of the positive electrode and resistance of the negative electrode are tested through the resistance tester; thirdly, pressure is applied to the positive plate electrode and the negative plate electrode through the compression tester, the thickness of the diaphragm is reduced under the effect of external pressure, resistance of the diaphragm of different thicknesses is tested through the resistance tester, if a resistance magnitude order is not reduced obviously, pressure is applied continuously, the thickness of the diaphragm is reduced until the resistance magnitude order is reduced obviously, the diaphragm is broken at the moment, the positive electrode and the negative electrode make contact with each other, and a short-circuit phenomenon occurs. According to the method, the short-circuit resistant effect of the diaphragm can be directly tested, the states of the diaphragm in the assembly process and the use process of a lithium battery can be simulated as well, and a short-circuit generation tread is effected checked.
Description
Technical field
The present invention relates to the technical field of method of testing, especially a kind of method of testing of lithium battery diaphragm anti-short circuit capability.
Background technology
Lithium battery is a class by lithium metal or lithium alloy as negative material, organic solution as electrolytical battery.Be widely used on portable type electronic product at present.Compare with traditional aqueous solution battery, lithium battery has higher specific energy, long cycle life and the advantage such as environmentally friendly, is the battery system that a kind of development potentiality is very large.
In the structure of lithium battery, barrier film is one of crucial inner assembly, and its performance has determined interfacial structure, internal resistance of battery etc., has directly affected capacity, circulation and the security performance of battery.The Main Function of barrier film: the one, allow electrolyte ion pass through, the 2nd, separate the positive and negative electrode of battery, prevent the two poles of the earth contact and be short-circuited.Because electrode surface of lithium battery is rough, in battery assembling and use procedure, can form the dendritic crystal of lithium, barrier film is easily subject to acupuncture and extruding, be easy to cause membrane ruptures, positive and negative polarities are contacted, cause battery to be short-circuited, a large amount of electric currents raises rapidly by causing the temperature of inside battery, blasts, the safety problem such as burning.
For fear of the generation of this class safety problem, in production testing process, conventionally adopt puncture intensity to characterize the trend being short-circuited in barrier film assembling and use procedure.Yet puncture intensity is only indirectly to have characterized the trend being short-circuited, can not directly illustrate that barrier film stops the effect of short circuit.There is relevant report to point out, in lithium battery industry, even if passed through the product of standard test, equally security accident can occur.Tracing it to its cause, is because some standard detection project is the abuse security of test battery, wherein just comprise the test of barrier film puncture intensity, but this report is only pointed out problem, retrofit testing method is not discussed.
Summary of the invention
The technical problem to be solved in the present invention is: for the weak point of existing method of testing, the invention provides a kind of method of testing of lithium battery diaphragm anti-short circuit capability, the method not only can directly be measured the effect that barrier film prevents short circuit, state when can also simulate barrier film in lithium battery assembling and using, the trend that effectively check is short-circuited.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of testing of lithium battery diaphragm anti-short circuit capability, and concrete steps are as follows:
One, be ready to testing tool: lithium battery diaphragm, positive electrode plate, negative electrode plate, electrolyte, computer observing and controlling compression test and resistance meter;
Two, lithium battery diaphragm is positioned between positive electrode plate and negative electrode plate, and together with positive electrode plate, negative electrode plate are fitted tightly with lithium battery diaphragm, be filled with electrolyte, two probes of resistance meter are placed in respectively positive and negative polarities, utilize resistance meter to test out the resistance of positive and negative polarities;
Three, utilize computer observing and controlling compression test to exert pressure to positive electrode plate and the negative electrode plate at two ends, lithium battery diaphragm in the middle of being positioned at is under the effect of external pressure, thickness reduces, utilize the resistance of resistance meter test lithium battery diaphragm when different-thickness, if the resistance order of magnitude does not significantly reduce, computer observing and controlling compression test continuation increase is exerted pressure so, continue to reduce lithium battery diaphragm thickness, until the resistance meter institute measuring resistance order of magnitude obviously reduces, now lithium battery diaphragm has and breaks, both positive and negative polarity is contacted, and phenomenon is short-circuited.
Further specifically, the surface that described positive electrode plate and negative electrode plate contact with lithium battery diaphragm is rough electrode surface.
The invention has the beneficial effects as follows: the method for testing of a kind of lithium battery diaphragm anti-short circuit capability of the present invention, simulated battery in assembling and situation that lithium battery diaphragm that the factor such as the external impact occurring in using, extruding causes breaks, and draw intuitively the insulation resistance of lithium battery diaphragm, the trend being short-circuited when more effectively having characterized lithium battery in assembling and having used.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the inner structure schematic diagram of lithium battery;
Fig. 2 is the schematic diagram before positive and negative electrode is exerted pressure;
Fig. 3 is the schematic diagram after positive and negative electrode is exerted pressure.
In figure: 1-lithium battery diaphragm, 2-positive electrode plate, 3-negative electrode plate.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, basic structure of the present invention is only described in a schematic way, so it only show the formation relevant with the present invention.
As shown in Figure 1, Figure 2 and Figure 3, the method for testing of this kind of lithium battery diaphragm anti-short circuit capability, concrete steps are as follows:
One, be ready to testing tool: lithium battery diaphragm 1, positive electrode plate 2, negative electrode plate 3, electrolyte, computer observing and controlling compression test and resistance meter;
Two, lithium battery diaphragm 1 is positioned between positive electrode plate 2 and negative electrode plate 3, and together with positive electrode plate 2, negative electrode plate 3 are fitted tightly with lithium battery diaphragm 1, the surface that positive electrode plate 2 and negative electrode plate 3 contact with lithium battery diaphragm 1 is rough electrode surface, be filled with after electrolyte, two probes of resistance meter are placed in respectively positive and negative polarities, utilize resistance meter to test out the resistance of positive and negative polarities;
Three, utilize computer observing and controlling compression test to exert pressure to positive electrode plate 2 and the negative electrode plate 3 at two ends, lithium battery diaphragm 1 in the middle of being positioned at is under the effect of external pressure, thickness reduces, and utilizes the resistance of resistance meter test lithium battery diaphragm 1 when different-thickness simultaneously.If the resistance order of magnitude does not significantly reduce, computer observing and controlling compression test continuation increase is exerted pressure so, continue to reduce lithium battery diaphragm 1 thickness, until the resistance meter institute measuring resistance order of magnitude obviously reduces, now lithium battery diaphragm 1 has and breaks, both positive and negative polarity is contacted, and phenomenon is short-circuited.
When lithium battery diaphragm 1 thickness compresses 10%, the resistance at test electrode two ends, if the order of magnitude of institute's measured value does not obviously reduce, computer observing and controlling compression test continuation increase is exerted pressure so, continues to reduce lithium battery diaphragm 1 thickness; When lithium battery diaphragm 1 thickness compresses 25%, the resistance at test electrode two ends, if the order of magnitude of institute's measured value does not obviously reduce, computer observing and controlling compression test continuation increase is exerted pressure so, continues to reduce lithium battery diaphragm 1 thickness; When lithium battery diaphragm 1 thickness compresses 50%, the resistance at test electrode two ends, if the order of magnitude of institute's measured value does not obviously reduce, computer observing and controlling compression test continuation increase is exerted pressure so, continues to reduce lithium battery diaphragm 1 thickness; When lithium battery diaphragm 1 thickness is compressed to a certain degree, institute's measuring resistance order of magnitude obviously reduces, and stops immediately increasing pressure, record the now compressibility of lithium battery diaphragm 1, this value is larger, lithium battery diaphragm 1 is described under external force, difficult breaking, the ability of Short Circuit withstand is just stronger, otherwise this value is less, lithium battery diaphragm 1 is described under external force, easily crack, anti-short circuit capability is just poorer.
The above-mentioned foundation desirable embodiment of the present invention of take is enlightenment, and by above-mentioned description, relevant staff can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on instructions, must determine its technical scope according to claim scope.
Claims (2)
1. a method of testing for lithium battery diaphragm anti-short circuit capability, is characterized in that: concrete steps are as follows:
One, be ready to testing tool: lithium battery diaphragm (1), positive electrode plate (2), negative electrode plate (3), electrolyte, computer observing and controlling compression test and resistance meter;
Two, lithium battery diaphragm (1) is positioned between positive electrode plate (2) and negative electrode plate (3), and together with positive electrode plate (2), negative electrode plate (3) are fitted tightly with lithium battery diaphragm (1), be filled with electrolyte, two probes of resistance meter are placed in respectively positive and negative polarities, utilize resistance meter to test out the resistance of positive and negative polarities;
Three, utilize computer observing and controlling compression test to exert pressure to positive electrode plate (2) and the negative electrode plate (3) at two ends, lithium battery diaphragm (1) in the middle of being positioned at is under the effect of external pressure, thickness reduces, utilize the resistance of resistance meter test lithium battery diaphragm (1) when different-thickness, if the resistance order of magnitude does not significantly reduce, computer observing and controlling compression test continuation increase is exerted pressure so, continue to reduce lithium battery diaphragm (1) thickness, until the resistance meter institute measuring resistance order of magnitude obviously reduces, now lithium battery diaphragm (1) has and breaks, both positive and negative polarity is contacted, phenomenon is short-circuited.
2. the method for testing of a kind of lithium battery diaphragm anti-short circuit capability according to claim 1, is characterized in that: described positive electrode plate (2) and negative electrode plate (3) are rough electrode surface with the surface that lithium battery diaphragm (1) contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410398958.0A CN104181436A (en) | 2014-08-13 | 2014-08-13 | Method for testing lithium battery diaphragm short-circuit resistant capacity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410398958.0A CN104181436A (en) | 2014-08-13 | 2014-08-13 | Method for testing lithium battery diaphragm short-circuit resistant capacity |
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| CN201410398958.0A Pending CN104181436A (en) | 2014-08-13 | 2014-08-13 | Method for testing lithium battery diaphragm short-circuit resistant capacity |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110342A (en) * | 2017-12-29 | 2018-06-01 | 山东精工电子科技有限公司 | A kind of lithium battery diaphragm and electrolyte matching detection device and method |
| CN108627387A (en) * | 2018-06-28 | 2018-10-09 | 桑德集团有限公司 | A kind of test method of battery diaphragm puncture resistant ability and test combine the unit |
| CN111090052A (en) * | 2019-11-27 | 2020-05-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for detecting burrs of pole group of reserve lithium battery |
| CN111900484A (en) * | 2020-07-24 | 2020-11-06 | 合肥国轩高科动力能源有限公司 | Quadrupole ear soft-package battery cell and manufacturing method and application thereof |
| CN112557924A (en) * | 2020-12-17 | 2021-03-26 | 中国电子科技集团公司第十八研究所 | Lithium battery material electrical property testing device and testing method based on temperature and pressure control |
| CN113661398A (en) * | 2018-11-29 | 2021-11-16 | 株式会社Lg新能源 | Cell performance measuring method |
-
2014
- 2014-08-13 CN CN201410398958.0A patent/CN104181436A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110342A (en) * | 2017-12-29 | 2018-06-01 | 山东精工电子科技有限公司 | A kind of lithium battery diaphragm and electrolyte matching detection device and method |
| CN108627387A (en) * | 2018-06-28 | 2018-10-09 | 桑德集团有限公司 | A kind of test method of battery diaphragm puncture resistant ability and test combine the unit |
| CN108627387B (en) * | 2018-06-28 | 2020-12-04 | 桑顿新能源科技有限公司 | Method and combined device for testing puncture resistance of battery diaphragm |
| CN113661398A (en) * | 2018-11-29 | 2021-11-16 | 株式会社Lg新能源 | Cell performance measuring method |
| CN113661398B (en) * | 2018-11-29 | 2024-06-07 | 株式会社Lg新能源 | Method for measuring performance of cell and method for measuring performance of secondary battery |
| CN111090052A (en) * | 2019-11-27 | 2020-05-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for detecting burrs of pole group of reserve lithium battery |
| CN111900484A (en) * | 2020-07-24 | 2020-11-06 | 合肥国轩高科动力能源有限公司 | Quadrupole ear soft-package battery cell and manufacturing method and application thereof |
| CN112557924A (en) * | 2020-12-17 | 2021-03-26 | 中国电子科技集团公司第十八研究所 | Lithium battery material electrical property testing device and testing method based on temperature and pressure control |
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Application publication date: 20141203 |