CN204228291U - A kind of measurement mechanism of diaphragm closed pore temperature and system - Google Patents
A kind of measurement mechanism of diaphragm closed pore temperature and system Download PDFInfo
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- CN204228291U CN204228291U CN201420744117.6U CN201420744117U CN204228291U CN 204228291 U CN204228291 U CN 204228291U CN 201420744117 U CN201420744117 U CN 201420744117U CN 204228291 U CN204228291 U CN 204228291U
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- barred body
- diaphragm
- closed pore
- temperature
- measurement mechanism
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Abstract
The utility model belongs to measurement mechanism technical field, in particular to a kind of measurement mechanism and system of diaphragm closed pore temperature, the measurement mechanism of described diaphragm closed pore temperature, comprises the diaphragm support plate for placing barrier film, contact rod and insulation crust, and diaphragm support plate is placed in insulation crust; Contact rod comprises the first conduction barred body and the second conduction barred body; First conduction barred body is placed in the top of diaphragm support plate and can moves towards barrier film; One end of second conduction barred body is positioned at the below of diaphragm support plate, and the other end contacts with membrane surface with after diaphragm support plate through insulation crust successively.Described system, comprises above-mentioned measurement mechanism.Relative to prior art, the utility model creatively adopts electric-resistivity method to simulate fixture bake process to the impact of barrier film hole, thus record the parameter such as closed pore temperature and melt temperature of barrier film, and provide guidance by parameters such as the closed pore temperatures of different temperatures, different pressures condition lower diaphragm plate to actual production, the closed pore temperature of barrier film under hot pressing condition, the isoparametric blank testing of melt temperature are filled up, for the safe handling of product provides guarantee.
Description
Technical field
The utility model belongs to measurement mechanism technical field, particularly a kind of measurement mechanism of diaphragm closed pore temperature and system.
Background technology
Lithium ion battery is made up of positive plate, negative plate, the barrier film and electrolytic solution etc. be arranged at intervals between positive plate and negative plate.Wherein, barrier film is as the significant components in lithium ion battery, and its Main Function is that positive plate and negative plate are separated, and prevent two electrode contacts and the short circuit caused, barrier film also has the function that electrolyte ion is passed through in addition.The performance of barrier film determines the interfacial structure and internal resistance etc. of battery, directly affects the capacity of battery, cycle performance and security performance etc.The barrier film of excellent performance has important effect to the combination property improving battery.The material of barrier film is nonconducting, and the performance of its physicochemical property to battery has a great impact.
Lithium ion battery barrier film used requires to have enough mechanical properties, comprise higher puncture strength, higher pulling strengrth and less thermal shrinkage etc., but thickness is little as far as possible, require that there is certain aperture and porosity simultaneously, low resistance and high ionic conductivity can be ensured, have good permeability and electronic isolation to lithium ion.Meanwhile, barrier film must corrode by electrolyte resistance, has enough chemistry and electrochemical stability, gets well and have enough imbibition moisture-retaining capacity to the wellability of electrolytic solution.The more important thing is that barrier film will have good thermal stability and automatically shut down protective value to guarantee the security performance of battery excellence.
The diaphragm material of the marketization is mainly based on the polyolefins barrier film of tygon (PE), polypropylene (PP), this kind of barrier film has the micropore of countless intercommunication, aperture is 0.01 ~ 10 μm, and the size of production septation pressure can produce larger impact to its porosity.If due to the reasons such as battery abnormal (as short circuit) cause internal temperature of battery to raise time, membrane pore size can reduce, and resistance can increase thereupon, as the closed pore temperature T of temperature arrival barrier film
mtime, the micropore of barrier film closes, and this phenomenon is called Shut down (closed pore phenomenon).If when temperature continues Melt down (melting) temperature being increased to barrier film, barrier film makes micropore disappear because of fusing.Once battery temperature raises further, then film rupture can occur when reaching a certain temperature, now electrode will directly contact, and is equivalent to short circuit, and this is breakneck.The melt temperature of barrier film and the difference of closed pore temperature are the deciding factors determining battery safety.
At present, lithium ion battery separator product supplier does not provide the closed pore temperature of separator product, melt temperature etc. to be related to the key parameter of product use safety, and also there is larger difference in different barrier film manufacturer in this performance.Major part manufacturer also lacks the effective testing standard for these parameters, thus has influence on the determination of lithium ion battery safe handling scope.
For current actual state, the measurement mechanism inventor providing a kind of diaphragm closed pore temperature of the present utility model, it can measure the change by hot pressing condition lower diaphragm plate resistance, the parameters such as the closed pore temperature of barrier film are determined by " resistance-temperature " curve, guidance is provided to actual production, for the safe handling of product is given security by parameters such as the closed pore temperatures of different temperatures, different pressures condition lower diaphragm plate.
Utility model content
One of the purpose of this utility model is: for the deficiencies in the prior art, and a kind of measurement mechanism of diaphragm closed pore temperature is provided, it can measure the change by hot pressing condition lower diaphragm plate resistance, the parameters such as the closed pore temperature of barrier film are determined by " resistance-temperature " curve, guidance is provided to actual production, for the safe handling of product is given security by parameters such as the closed pore temperatures of different temperatures, different pressures condition lower diaphragm plate.
To achieve these goals, the utility model adopts following technical scheme:
A measurement mechanism for diaphragm closed pore temperature, comprises the diaphragm support plate for placing the barrier film being soaked with electrolytic solution, contact rod and insulation crust, and described diaphragm support plate is placed in described insulation crust;
Described contact rod comprises the first conduction barred body and the second conduction barred body;
Described first conduction barred body is arranged at the top of described diaphragm support plate and can moves towards barrier film;
One end of described second conduction barred body is positioned at the below of described diaphragm support plate, and the other end contacts with membrane surface with after described diaphragm support plate through described insulation crust successively.
One as the measurement mechanism of the utility model diaphragm closed pore temperature is improved, and described insulation crust is set to teflon shell, polyphenylene sulfide shell or Kynoar shell.
One as the measurement mechanism of the utility model diaphragm closed pore temperature is improved, and described first conduction barred body and described second conduction barred body are all set to copper rod, aluminium bar or nickel rod.
One as the measurement mechanism of the utility model diaphragm closed pore temperature is improved, and described insulation crust comprises base plate, top board and side plate, and the two ends of described side plate are connected with described base plate and described top board respectively.
One as the measurement mechanism of the utility model diaphragm closed pore temperature is improved, described top board is provided with first through hole that can pass through for described first conduction barred body, and described first conduction barred body is fixedly connected with described top board by insulation nut, described insulation nut is positioned at the top of described top board, and the outside surface of described first conduction barred body is provided with the external thread with the screw-internal thread fit of described insulation nut.
One as the measurement mechanism of the utility model diaphragm closed pore temperature is improved, described diaphragm support plate is arranged on described base plate, and described base plate and described diaphragm support plate are respectively arranged with second through hole and third through-hole that can pass for described second conduction barred body.
One as the measurement mechanism of the utility model diaphragm closed pore temperature is improved, and the lower end of described first conduction barred body is provided with pressure transducer.
During use, first barrier film is cut into suitable shape and size, again this barrier film is dipped in electrolytic solution, be laid in after taking-up in diaphragm support plate, then the first conduction barred body is inserted in the first through hole of top board, the bottom of the first conduction barred body is contacted with the upper surface of barrier film, then fixes with insulation nut; And the second conduction barred body is inserted from the second through hole of base plate and diaphragm support plate and third through-hole, the top of the second contact rod is contacted with the lower surface of barrier film.Afterwards, again the first conduction barred body is connected with ac impedance measurement instrument respectively by wire with the second conduction barred body, diaphragm support plate is connected with temperature measurer, can resistance-temperature curve be obtained, the parameter such as closed pore temperature and melt temperature of barrier film under hot pressing condition can be read from this curve.
Relative to prior art, the utility model creatively adopts electric-resistivity method to simulate fixture bake process (i.e. hot pressing) to the impact of barrier film hole, thus record the parameter such as closed pore temperature and melt temperature of barrier film, and provide guidance by parameters such as the closed pore temperatures of different temperatures, different pressures condition lower diaphragm plate to actual production, the closed pore temperature of barrier film under hot pressing condition, the isoparametric blank testing of melt temperature are filled up, for the safe handling of product provides guarantee.In addition, the utility model structure is simple, simple to operation, with low cost, practical.
Another object of the present utility model is the measuring system providing a kind of diaphragm closed pore temperature, comprise temperature measurer, ac impedance measurement instrument, temperature-controlled box and measurement mechanism, described measurement mechanism is the measurement mechanism of diaphragm closed pore temperature described in the utility model, and described measurement mechanism is placed in described temperature-controlled box, described diaphragm support plate is connected with described temperature measurer, the upper end of described first conduction barred body is connected with described ac impedance measurement instrument by wire, and the lower end of described second conduction barred body is connected with described ac impedance measurement instrument by wire.
One as the measuring system of the utility model diaphragm closed pore temperature is improved, and described temperature-controlled box is temperature programmed control case.
One as the measuring system of the utility model diaphragm closed pore temperature is improved, and described temperature measurer is set to thermocouple thermometer.
Relative to prior art, the measuring system of diaphragm closed pore temperature of the present utility model can measure the change by hot pressing (fixture baking) condition lower diaphragm plate resistance, the parameter such as closed pore temperature, melt temperature of barrier film is determined by " resistance-temperature " curve, guidance is provided to actual production, for the safe handling of product is given security by parameters such as the closed pore temperatures of different temperatures, different pressures condition lower diaphragm plate.Whole system structure is simple, simple to operation, with low cost, practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1 of the present utility model.
Fig. 2 is the structural representation of embodiment 2 of the present utility model.
Wherein, 1-barrier film, 2-diaphragm support plate, 3-contact rod, 31-first conducts electricity barred body, and 32-second conducts electricity barred body, 4-insulation crust, 41-base plate, 42-top board, 43-side plate, 5-insulate nut, 6-pressure transducer, 7-temperature measurer, 8-ac impedance measurement instrument, 9-temperature-controlled box, 10-measurement mechanism, 11-wire.
Embodiment
Below in conjunction with embodiment, the utility model and beneficial effect thereof are described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1
As shown in Figure 1, the measurement mechanism of a kind of diaphragm closed pore temperature that the present embodiment provides, comprise the diaphragm support plate 2 for placing the barrier film 1 being soaked with electrolytic solution, contact rod 3 and insulation crust 4, used for electrolyte in realizing conducting, diaphragm support plate 2 is placed in insulation crust 4; Contact rod 3 comprises the first conduction barred body 31 and the second conduction barred body 32; First conduction barred body 31 is arranged at the top of diaphragm support plate 2 and can moves towards barrier film 1; One end of second conduction barred body 32 is positioned at the below of diaphragm support plate 2, and the other end passes after insulation crust 4 and diaphragm support plate 2 and the surface contact of barrier film 1 successively.When first conduction barred body 31 lower surface contact with the upper surface of barrier film 1, the second upper surface conducting electricity barred body 32 contact with the lower surface of barrier film 1 time, electrolytic solution is had because barrier film 1 infiltrates, therefore a conducting loop can just be formed, by drawing wire on the first conduction barred body 31 and the second conduction barred body 32, the resistance of barrier film 1 just can be tested.
The lower end of the first conduction barred body 31 is provided with pressure transducer 6, acts on the size of the pressure on barrier film 1, to regulate and control pressure to desired value for detecting the first conduction barred body 31.
Insulation crust 44 is set to teflon shell, polyphenylene sulfide shell or Kynoar shell, and the shell of these materials has the characteristics such as high temperature resistant, corrosion-resistant, can prevent corrosion and the seepage of electrolytic solution.
First conduction barred body 31 and the second conduction barred body 32 are all set to copper rod, aluminium bar or nickel rod, and the contact rod of these materials all has good electric conductivity.
Insulation crust 4 comprises base plate 41, top board 42 and side plate 43, and the two ends of side plate 43 are connected with base plate 41 and top board 42 respectively, the space that namely whole insulation crust 4 inside formation one is airtight.Because the solvent contained in electrolytic solution is generally organic solvent, if be therefore exposed in air, easily cause potential safety hazard.
On top board, 42 are provided with first through hole that can pass through for the first conduction barred body 31, and the first conduction barred body 31 is fixedly connected with top board 42 by insulation nut 5, insulation nut 5 is positioned at the top of top board 42, and the outside surface of the first conduction barred body 31 is provided with the external thread with the screw-internal thread fit of the nut 5 that insulate.The method of fixing the first conduction barred body 31 of being threaded is simple, is easy to realize, mount and dismount all very convenient, and can realize firm connection.
Diaphragm support plate 2 is arranged on base plate 41, and base plate 41 and diaphragm support plate 2 are respectively arranged with second through hole and third through-hole that can pass for the second conduction barred body 32, namely the second conduction barred body 32 is fixed in base plate 41 and diaphragm support plate 2, and its upper end contacts with the lower surface of barrier film 1.In the present embodiment, diaphragm support plate 2 is cylindric, and its diameter should be less than the diameter of barrier film 1 and guarantee that barrier film 1 can cover diaphragm support plate 2 completely.Diaphragm support plate 2 should have excellent heat conductivility, the temperature of barrier film 1 to be delivered in diaphragm support plate 2 in real time, quickly, makes temperature measurement result more press close to the true temperature of barrier film 1.
During use, first barrier film 1 is cut into suitable shape and size (if diameter is the circle of 45mm), again this barrier film 1 is dipped in electrolytic solution and takes out after 3h, unsettled 60s, then it is laid in carefully in diaphragm support plate 2, and guarantee that barrier film 1 covers the upper surface of diaphragm support plate 2 completely, and the top of the second conduction barred body 32 is contacted with the lower surface of barrier film 1.Wherein, the component of electrolytic solution is: solvent is the potpourri of diethyl carbonate and ethylene carbonate, and the volume ratio of the two is 1:1, and solute is LiPF
6, and the concentration of solute is 1mol/L.
Then, insert the first conduction barred body 31, its bottom is contacted with the upper surface of barrier film 1, then the first conduction barred body 31 is fixed by insulation nut 5, in addition, can be regulated the pressure of the first conduction barred body 31 pairs of barrier films 1 by external pressurized device, pressure transducer 6 can be responded to this pressure and be presented on external pressurized device, thus can test the parameters such as the closed pore temperature of the barrier film in different pressures situation.
Embodiment 2
As shown in Figure 2, present embodiments provide a kind of measuring system of diaphragm closed pore temperature, comprise temperature measurer 7, ac impedance measurement instrument 8, temperature-controlled box 9 and measurement mechanism 10, measurement mechanism 10 is the measurement mechanism of the diaphragm closed pore temperature of embodiment 1, and measurement mechanism 10 is placed in temperature-controlled box 9, thus temperature-controlled box 9 can heat measurement mechanism 10; Diaphragm support plate 2 is connected with temperature measurer 7, and temperature measurer 7 can test the temperature of the barrier film 1 in diaphragm support plate 2; The upper end of the first conduction barred body 31 is connected with ac impedance measurement instrument 8 by wire 11, and the lower end of the second conduction barred body 32 is connected with ac impedance measurement instrument 8 by wire 11, thus forms a conductive path.
Wherein, temperature-controlled box 9 is temperature programmed control case, and this temperature-controlled box can regulate heating rate easily, with simulate fixture bake process, presses close to produce, to set up temperature resistance curve.
Temperature measurer 7 is set to thermocouple thermometer, and this thermometer is quick on the draw, and thermometric is accurate.
During use, by the lower end of the second conduction barred body 32, measurement mechanism 10 is fixed on the platform of temperature-controlled box 9, the first conduction barred body 31 is made to be connected with ac impedance measurement instrument 8 respectively by wire 11 with the second conduction barred body 32 again, first use the resistance value R at ac impedance measurement instrument 8 testing conductive rod 3 two ends, then the connection of ac impedance measurement instrument 8 and contact rod 3 is removed.Then barrier film 1 is cut into suitable shape and size (if diameter is the circle of 45mm), again this barrier film 1 is dipped in electrolytic solution and takes out after 3h, unsettled 60s, then it is laid in carefully in diaphragm support plate 2, and guarantee that barrier film 1 covers the upper surface of diaphragm support plate 2 completely, and the top of the second conduction barred body 32 is contacted with the lower surface of barrier film 1.Wherein, the component of electrolytic solution is: solvent is the potpourri of diethyl carbonate and ethylene carbonate, and the volume ratio of the two is 1:1, and solute is LiPF
6, and the concentration of solute is 1mol/L.
Then, insert the first conduction barred body 31, its bottom is contacted with the upper surface of barrier film 1, then the first conduction barred body 31 is fixed by insulation nut 5, regulate the pressure of the first conduction barred body 31 pairs of barrier films 1 to experiment value by external pressurized device, pressure transducer 6 can be responded to this pressure and be presented on external pressurized device.
The first conduction barred body 31 is made to be connected with ac impedance measurement instrument 8 respectively by wire with the second conduction barred body 32 again, and temperature measurer 7 is connected with diaphragm support plate 2, regulate the heating rate (as 5-7 DEG C/min) of temperature-controlled box 9, a temperature value and resistance value is recorded every 30s, thus can resistance-temperature curve be made, the parameter such as closed pore temperature and melt temperature of barrier film 1 under hot pressing condition can be obtained from this curve.
The utility model creatively adopts electric-resistivity method to simulate fixture bake process (i.e. hot pressing) to the impact of the hole of barrier film 1, thus record the parameter such as closed pore temperature and melt temperature of barrier film 1, and provide guidance by parameters such as the closed pore temperatures of different temperatures, different pressures condition lower diaphragm plate 1 to actual production, the closed pore temperature of barrier film 1 under hot pressing condition, the isoparametric blank testing of melt temperature are filled up, for the safe handling of product provides guarantee.In addition, the utility model structure is simple, simple to operation, with low cost, practical.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change above-mentioned embodiment and revise.Therefore, the utility model is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present utility model modifications and changes more of the present utility model.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the utility model.
Claims (10)
1. a measurement mechanism for diaphragm closed pore temperature, is characterized in that: comprise the diaphragm support plate for placing the barrier film being soaked with electrolytic solution, contact rod and insulation crust, and described diaphragm support plate is placed in described insulation crust;
Described contact rod comprises the first conduction barred body and the second conduction barred body;
Described first conduction barred body is arranged at the top of described diaphragm support plate and can moves towards barrier film;
One end of described second conduction barred body is positioned at the below of described diaphragm support plate, and the other end contacts with membrane surface with after described diaphragm support plate through described insulation crust successively.
2. the measurement mechanism of diaphragm closed pore temperature according to claim 1, is characterized in that: described insulation crust is set to teflon shell, polyphenylene sulfide shell or Kynoar shell.
3. the measurement mechanism of diaphragm closed pore temperature according to claim 1, is characterized in that: described first conduction barred body and described second conduction barred body are all set to copper rod, aluminium bar or nickel rod.
4. the measurement mechanism of diaphragm closed pore temperature according to claim 1 and 2, is characterized in that: described insulation crust comprises base plate, top board and side plate, and the two ends of described side plate are connected with described base plate and described top board respectively.
5. the measurement mechanism of diaphragm closed pore temperature according to claim 4, it is characterized in that: described top board is provided with first through hole that can pass through for described first conduction barred body, and described first conduction barred body is fixedly connected with described top board by insulation nut, described insulation nut is positioned at the top of described top board, and the outside surface of described first conduction barred body is provided with the external thread with the screw-internal thread fit of described insulation nut.
6. the measurement mechanism of diaphragm closed pore temperature according to claim 4, it is characterized in that: described diaphragm support plate is arranged on described base plate, and described base plate and described diaphragm support plate are respectively arranged with second through hole and third through-hole that can pass for described second conduction barred body.
7. the measurement mechanism of diaphragm closed pore temperature according to claim 4, is characterized in that: the lower end of described first conduction barred body is provided with pressure transducer.
8. the measuring system of a diaphragm closed pore temperature, it is characterized in that: comprise temperature measurer, ac impedance measurement instrument, temperature-controlled box and measurement mechanism, described measurement mechanism is the measurement mechanism of the diaphragm closed pore temperature described in any one of claim 1 to 7, and described measurement mechanism is placed in described temperature-controlled box, described diaphragm support plate is connected with described temperature measurer, the upper end of described first conduction barred body is connected with described ac impedance measurement instrument by wire, and the lower end of described second conduction barred body is connected with described ac impedance measurement instrument by wire.
9. the measuring system of diaphragm closed pore temperature according to claim 8, is characterized in that: described temperature-controlled box is temperature programmed control case.
10. the measuring system of diaphragm closed pore temperature according to claim 8, is characterized in that: described temperature measurer is set to thermocouple thermometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420744117.6U CN204228291U (en) | 2014-12-01 | 2014-12-01 | A kind of measurement mechanism of diaphragm closed pore temperature and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420744117.6U CN204228291U (en) | 2014-12-01 | 2014-12-01 | A kind of measurement mechanism of diaphragm closed pore temperature and system |
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| CN204228291U true CN204228291U (en) | 2015-03-25 |
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| CN201420744117.6U Expired - Fee Related CN204228291U (en) | 2014-12-01 | 2014-12-01 | A kind of measurement mechanism of diaphragm closed pore temperature and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404722A (en) * | 2016-11-03 | 2017-02-15 | 深圳市沃特玛电池有限公司 | Detection device and method for shutdown temperature of lithium-ion battery separator |
| CN108303442A (en) * | 2017-12-18 | 2018-07-20 | 合肥国轩高科动力能源有限公司 | A kind of diaphragm closed pore temperature test method |
-
2014
- 2014-12-01 CN CN201420744117.6U patent/CN204228291U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404722A (en) * | 2016-11-03 | 2017-02-15 | 深圳市沃特玛电池有限公司 | Detection device and method for shutdown temperature of lithium-ion battery separator |
| CN106404722B (en) * | 2016-11-03 | 2019-05-28 | 深圳市沃特玛电池有限公司 | The detection device and method of lithium ion battery separator closed pore temperature |
| CN108303442A (en) * | 2017-12-18 | 2018-07-20 | 合肥国轩高科动力能源有限公司 | A kind of diaphragm closed pore temperature test method |
| CN108303442B (en) * | 2017-12-18 | 2020-08-14 | 合肥国轩高科动力能源有限公司 | Diaphragm closed pore temperature testing method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20191201 |