CN205643215U - Testing arrangement of lithium ion battery diaphragm obturator temperature and rupture of membranes temperature - Google Patents
Testing arrangement of lithium ion battery diaphragm obturator temperature and rupture of membranes temperature Download PDFInfo
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- CN205643215U CN205643215U CN201620317154.8U CN201620317154U CN205643215U CN 205643215 U CN205643215 U CN 205643215U CN 201620317154 U CN201620317154 U CN 201620317154U CN 205643215 U CN205643215 U CN 205643215U
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Abstract
The utility model relates to a testing arrangement of lithium ion battery diaphragm obturator temperature and rupture of membranes temperature, including oven and unfamiliar sample, inside one end opening, the other end confined pipeline of being equipped with of oven, the open end of pipeline seals it through unfamiliar sample, the blind end of pipeline passes through the trachea and is connected with the gas cylinder, the oven surface is equipped with the temperature display panel, the temperature of being heated that shows unfamiliar sample is connected to the temperature display panel through wire and the thermocouple of locating unfamiliar sample bottom. The utility model provides a testing arrangement is simple to use convenient, does not contain complicated accurate part, does not use electricity test equipment such as internal resistance appearance, and the practicality is stronger, use cost is low.
Description
Technical field
This utility model relates to technical field of lithium-ion battery, is specifically related to the test device of a kind of lithium ion battery separator closed pore temperature and broken film temperature.
Background technology
Barrier film is one of four big key material of composition lithium ion battery, is mainly used in completely cutting off positive and negative electrode material and prevents from forming internal short-circuit and allowing lithium ion freely through.Therefore the characteristic of barrier film is for the performance of lithium ion battery, and such as high rate performance, cycle performance and security performance etc. have important impact.
Closed pore temperature and broken film temperature are one of key properties of barrier film, are also to be applied to the overriding concern index that lithium ion battery guarantees safety.In order to ensure passing freely through of lithium ion, barrier film that can be commercially use all has the most through microcellular structure, substantial amounts of Joule heat can be produced due to violent electrochemical reaction during internal short-circuit of battery, when temperature reaches the closed pore temperature of barrier film, barrier film can hinder passing through of lithium ion by shrinking closed pore, so that the internal resistance of cell steeply rises and avoid the generation of further thermal runaway, therefore select the barrier film with suitable closed pore temperature to ensureing that battery security is significant.When raising further after internal temperature of battery exceedes diaphragm closed pore temperature, once reach the fusion temperature of barrier film, barrier film can melt to rupture and cause the direct contact short circuit of both positive and negative polarity, it is likely to occur the danger such as blast, it is seen that the broken film temperature promoting barrier film is also the inevitable requirement ensureing lithium ion battery security.In a word, closed pore temperature and the broken film temperature of barrier film is all the important indicator being related to lithium ion battery security.
Generally use closed pore temperature and the broken film temperature of sudden change of resistivity method test barrier film at present, the patent of such as Publication No. CN 101625271A is open uses barrier film sample making button cell, then test this button cell resistance variations under Elevated Temperature Conditions, utilize the point of the sudden change of resistivity on temperature-resistance change curve to judge closed pore temperature and the broken film temperature of barrier film；The patent report of Publication No. CN 101221140A uses special test device to be fixed by barrier film sample and with electrolyte by its moistening, then this device of re-test resistance variations under Elevated Temperature Conditions, judges closed pore temperature and the broken film temperature of barrier film also with sudden change of resistivity point.Though sudden change of resistivity method there is feasibility its limitation the most clearly, because in order to test membrane electrical resistance, inevitably use electrolyte moistening barrier film, the difference of electrolyte composition and the volatility in test process all can have influence on comparative and the repeatability of test result.In addition this method needs make battery or use special test device, needs to use accurate internal resistance instrument to measure internal resistance, and testing cost is higher.
Utility model content
For the defect of existing existence, the purpose of this utility model is to provide a kind of simple and convenient lithium ion battery separator closed pore temperature and the test device of broken film temperature.
Design philosophy of the present utility model is:
Barrier film in lithium ion battery allow for stop electronics by and permission lithium ion pass freely through, the most all there is through micro-cavernous structure.Certain pressure drop can be produced when there is the gas of certain initial pressure by barrier film and keep constant pressure.When barrier film is persistently heated, when temperature rises and reaches its closed pore temperature, the even thoroughly obturation that diminishes can be shunk in the aperture of barrier film, and now pressure drop diminishes, and can be flown up by the gas pressure of barrier film；When temperature raises further, after reaching barrier film fusing-off temperature, membrane ruptures makes gas directly to run through, and now pressure drop becomes big, can be declined suddenly by the gas pressure of barrier film.Based on gas by this characteristic during barrier film, this utility model utilizes baking oven analog temperature uphill process, obtains temperature-gas pressure change curve, utilizes gas pressure catastrophe point to may determine that closed pore temperature and the broken film temperature of barrier film.
This utility model solves its technical problem and the technical scheme is that
A kind of lithium ion battery separator closed pore temperature and the test device of broken film temperature, the pipeline that including baking oven and barrier film sample, described oven interior is provided with one end open, the other end is closed, the opening of described pipeline is closed by barrier film sample；The blind end of pipeline is connected with gas cylinder by trachea；Described baking oven outer surface is provided with temperature display floater, and described temperature display floater is connected the heating temperature of display barrier film sample by wire with the thermocouple being located at barrier film sample bottom.
Scheme further, described barrier film sample is fixed on the opening of pipeline by stationary fixture.
Scheme further, described stationary fixture includes being symmetrically set the left ring for fixing of concave, convex groove edge and right ring for fixing, barrier film sample clamping is fastened in centre and by concave, convex groove edge by described left ring for fixing, right ring for fixing, and the stationary fixture outer ring sleeve after fastening is provided with sealing ring makes it be embedded in the inwall of pipeline and seal.
Scheme further, described thermocouple contacts with described stationary fixture, for detecting the temperature of barrier film sample, then temperature signal is converted into thermo-electromotive force signal, the temperature of measured medium it is converted into by electric meter, on the temperature display floater of final display, it is thus possible to intuitively observe the temperature of barrier film sample.
Scheme further, described trachea is provided with air relief valve, and the port of export of described air relief valve is provided with the barometer of air-flow air pressure in detecting entrance pipeline.
This detection device is in use, the barrier film sample of suitable size is first cut out according to stationary fixture, and it is placed in the middle of left ring for fixing and the right ring for fixing of stationary fixture, its middle left and right ring for fixing is the round shape structure of central aperture, its diameter closes with the diameter compatible of pipeline, the edge of left ring for fixing is provided with a circle groove, and the edge of right ring for fixing is provided with the tongue that the fit depressions with described left ring for fixing fastens.And carry out being buckled into an entirety by barrier film specimen holder in the middle of left ring for fixing and right ring for fixing.Then stationary fixture is embedded in the middle of pipeline tapping end, and uses sealing ring to carry out sealing fixing, to guarantee to enter all discharge lines through the hole of barrier film sample of the gas in pipeline.Detect air pressure and the temperature of same period the most respectively, draw out temperature and pressure change curve；Further according to temperature and pressure change curve, then fly up during the change of air pressure value with tem-perature and the temperature value corresponding to point that declines suddenly is respectively closed pore temperature and the broken film temperature of barrier film sample.
The utility model proposes closed pore temperature and the broken film temperature using pressure jump method to replace traditional sudden change of resistivity method measuring diaphragm, it is not related to use electrolyte and complicated electrical testing device and equipment, simply and easily barrier film sample can be measured itself, eliminating the impact of other factors, practicality is higher.
So the beneficial effects of the utility model are:
(1) this utility model utilizes pressure jump method to replace closed pore temperature and the broken film temperature of traditional sudden change of resistivity method test barrier film, it is not necessary to making button cell or use electrolyte moistening barrier film, test result influence factor is less, and repeatability and comparative are good；
(2) the test device in this utility model uses simple and convenient, does not comprise complex precise parts, does not use the electrical testing equipment such as internal resistance instrument, and practicality is higher, use cost is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of test device of the present utility model；
Fig. 2 is the broken away view of stationary fixture in this utility model；
Fig. 3 is the temperature and pressure change curve that embodiment 1 tests barrier film；
In figure: 1-gas cylinder；2-air relief valve；3-baking oven；4-stationary fixture；5-temperature display floater；6-thermocouple；7-pipeline；9-trachea；The left ring for fixing of 41-；The right ring for fixing of 42-；43-sealing ring.
Detailed description of the invention
Below by embodiment, this utility model is described further, but embodiment is not limiting as protection domain of the present utility model.
Embodiment 1
As it is shown in figure 1, a kind of lithium ion battery separator closed pore temperature and the test device of broken film temperature, including baking oven 3 and barrier film sample, described baking oven 3 is internal is provided with one end open, the pipeline 7 of other end closing, and the opening of described pipeline 7 is closed by barrier film sample；The blind end of pipeline 7 is connected with gas cylinder 1 by trachea 9；Described baking oven 3 outer surface is provided with temperature display floater 5, and described temperature display floater 5 is connected the heating temperature of display barrier film sample by wire with the thermocouple 6 being located at barrier film sample bottom.
Scheme further, described barrier film sample is fixed on the opening of pipeline 7 by stationary fixture 4.
Scheme further, described thermocouple 6 contacts with described stationary fixture 4.
Scheme further, described trachea 9 is provided with air relief valve 2, and the port of export of described air relief valve 2 is provided with the barometer of air-flow air pressure in detecting entrance pipeline 7.
As shown in Figure 1, 2, stationary fixture 4 includes being symmetrically set the left ring for fixing 41 of concave, convex trough rim and right ring for fixing 42, barrier film sample clamping is fastened in centre and by concave, convex trough rim by described left ring for fixing 41, right ring for fixing 42, and stationary fixture 4 outer ring sleeve after fastening is provided with sealing ring 43 makes it be embedded in the inwall of pipeline 7 and seal.
This detection device is in use, the barrier film sample of suitable size is first cut out according to the size of stationary fixture 4, and it is placed in the middle of left ring for fixing 41 and the right ring for fixing 42 of stationary fixture 4, fastened by its concave, convex trough rim, then stationary fixture 4 is embedded in the middle of the opening of pipeline 7, and use sealing ring to be sealed against being fixed in pipeline 7, to guarantee that gas in gas cylinder 1 enters after pipelines 7 all discharge lines 7 through the hole of barrier film sample by gas visitor 9.Detected air pressure and the temperature of the gas by barrier film sample of same period the most respectively respectively by barometer and thermocouple 6, air relief valve 2 is to ensure that gas is with constant pressure, evenly by barrier film sample.Then draw out temperature and pressure change curve, thus according to temperature and pressure change curve, then fly up during the change of air pressure value with tem-perature and the temperature value corresponding to point that declines suddenly is respectively closed pore temperature and the broken film temperature of barrier film sample.
The temperature and pressure change curve of its test barrier film as it is shown on figure 3, the closed pore temperature of this barrier film sample be 130.1 DEG C, broken film temperature be 145.2 DEG C.
Embodiment 1
Test device of the present utility model is used respectively polyethylene-based separators, polypropylene-base barrier film, polyethylene/polypropylene composite diaphragm to be carried out closed pore temperature and broken film temperature test.Before heat temperature raising, gas uniform speed is kept at 0.2MPa, 0.1MPa, 0.5MPa by the pressure of barrier film, and repeated sampling is averaged after measuring three times, and concrete test data are shown in Table 1:
The different barrier film sample tests of table 1
As can be seen from Table 1, the broken film temperature of polyethylene-based separators is relatively low, and the closed pore temperature of polypropylene-base barrier film is higher, and their security performance is poor；And the closed pore temperature of polyethylene/polypropylene composite diaphragm sample is relatively low and broken film temperature is higher, the most under the high temperature conditions can closed pore keep structural intergrity rapidly, its security performance is more preferable.
It should be pointed out that, the professional and technical personnel for making the art, on the premise of without departing from this utility model know-why, be that by the multiple amendment to these embodiments, and these amendments also should be regarded as in the range of this utility model should protect.
Claims (5)
1. a lithium ion battery separator closed pore temperature and the test device of broken film temperature, including baking oven (3) and barrier film sample (8), it is characterized in that: described baking oven (3) is internal is provided with one end open, the pipeline (7) of other end closing, and the opening of described pipeline (7) is closed by barrier film sample (8)；The blind end of pipeline (7) is connected with gas cylinder (1) by trachea (9)；Described baking oven (3) outer surface is provided with temperature display floater (5), and described temperature display floater (5) is connected the heating temperature of display barrier film sample (8) by wire with the thermocouple (6) being located at barrier film sample (8) bottom.
Test device the most according to claim 1, it is characterised in that: described barrier film sample (8) is fixed on the opening of pipeline (7) by stationary fixture (4).
Test device the most according to claim 2, it is characterized in that: described stationary fixture (4) includes being symmetrically set the left ring for fixing (41) of concave, convex groove edge and right ring for fixing (42), barrier film sample (8) is clamped in centre and is fastened by concave, convex groove edge by described left ring for fixing (41), right ring for fixing (42), and stationary fixture (4) outer ring sleeve after fastening is provided with sealing ring (43) makes it be embedded in the inwall of pipeline (7) and seal.
Test device the most according to claim 2, it is characterised in that: described thermocouple (6) contacts with described stationary fixture (4).
Test device the most according to claim 1, it is characterised in that: described trachea (9) is provided with air relief valve (2), and the port of export of described air relief valve (2) is provided with the barometer of air-flow air pressure in detecting entrance pipeline (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620317154.8U CN205643215U (en) | 2016-04-15 | 2016-04-15 | Testing arrangement of lithium ion battery diaphragm obturator temperature and rupture of membranes temperature |
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| CN201620317154.8U CN205643215U (en) | 2016-04-15 | 2016-04-15 | Testing arrangement of lithium ion battery diaphragm obturator temperature and rupture of membranes temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562608A (en) * | 2018-03-19 | 2018-09-21 | 上海恩捷新材料科技股份有限公司 | A kind of measuring and calculation method of porous membrane closed pore temperature |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562608A (en) * | 2018-03-19 | 2018-09-21 | 上海恩捷新材料科技股份有限公司 | A kind of measuring and calculation method of porous membrane closed pore temperature |
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