CN102636412B - Method for detecting leveling property of battery slurry - Google Patents
Method for detecting leveling property of battery slurry Download PDFInfo
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- CN102636412B CN102636412B CN201210035187.XA CN201210035187A CN102636412B CN 102636412 B CN102636412 B CN 102636412B CN 201210035187 A CN201210035187 A CN 201210035187A CN 102636412 B CN102636412 B CN 102636412B
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Abstract
The invention provides a method for detecting leveling property of battery slurry, which is used for measuring the flowing distance of the battery slurry with the set volume in a set inclined path and at set time, and then measuring the leveling property of the battery slurry according to the flowing distance. The method detects the leveling property of the battery slurry by the aid of the flowing property of the battery slurry. During detection, only the flowing distance of the quantitative slurry in the set inclined path and at the set time needs to be measured, if the flowing distance is longer, the leveling property is better, and the density of a polar plate surface prepared by the slurry is more uniform. The method is simple and convenient in operation and visual and accurate in results. Technicians in the field can determine upper and lower limit values of the flowing distance of a system of the standard slurry in advance, and when the slurry is blended, testing is performed according to the method until the flowing distance of the prepared slurry meets needs within a specified range.
Description
Technical field
The present invention relates to battery manufacture field, particularly a kind of detection method of cell size levelability.
Background technology
In recent years, along with the exhaustion of traditional petrochemical industry resource, and the oil price causing the thus series of problems such as skyrocket, people increase day by day to the demand of new cleaning fuel.Lithium ion ion battery is a kind of novel power supply, and it is high that it has energy density, have extended cycle life and the advantage such as pollution-free, and be a kind of portable chemical energy that current specific energy is the highest.Lithium ion battery development since coming out rapidly, has now been widely used in the equipment such as notebook computer, video camera, mobile communications tool and camera.
Though lithium ion battery has above-mentioned advantage, but its high rate performance has much room for improvement, and this is also to limit one of its reason in the application of vehicles power source.In order to optimize the high rate performance of battery, need to make the current density of battery even, reduce thus polarization, reduce thermal value.
In lithium ion battery, active material is overlying on the collection liquid surfaces such as aluminium foil or Copper Foil, and the electronics that collector produces electrochemical reaction by the physical contact with active material collects and exports to external circuit, thereby realizes the process that chemical energy is converted into electric energy.Can know by inference thus, active material has important material impact in the distribution situation of collection liquid surface to the current density of lithium battery.
In existing lithium battery manufacturing process, normally the slurry that contains active material is coated on collector, in order to make battery current even density, need active substance can be uniformly distributed in collection liquid surface, discharge and recharge and make the lithium ion can be dispersed at inside battery.And the homogeneity applying in order to reach active substance just needs slurry to have the levelability of setting.
In electrokinetic cell is produced, the painting process index of core is CPK value the most, and it refers to process capability index, this value is higher mean the yield rate of this operation and consistance higher.When preparation electrode slurry, just should regulate slurry to make slurry have best levelability, to promote the CPK value of painting process, this just requires the levelability of method energy test slurry, in order to the flow leveling of quantitative test slurry, and can adjust according to this numerical value the CPK value of product.
For the levelability of electrode slurry, prior art is mainly to investigate from the rheological curve of slurry, judges the quality of levelability according to the size of setting the variation of viscosity in range of shear rate.Adopt the method to investigate the levelability of slurry, simple, intuitive, and complex operation not, is not suitable for applying in large-scale production.Another kind method is exactly the detection method that adopts coating flow, by the flow of sagging instrument testing size, and then the levelability of judgement slurry.But consider electrode slurry self solid containing and viscosity make a big difference with coating, slurry be highly admittedly contain, full-bodied a kind of non-Newtonian fluid, so the method for sagging instrument can not obviously detect the performance of pulp flow aspect accurately, error is larger.
Summary of the invention
The technical matters that the present invention solves is to provide a kind of easy and simple to handle, and visual result is electrode slurry levelability detection method accurately.
In view of this, the invention provides a kind of detection method of electrode slurry levelability, comprising:
Measure the electrode slurry of setting volume in the mobile distance of setting under slant path and setting-up time, according to the levelability flowing apart from detecting electrode slurry.
Preferably, specifically comprise the following steps:
The electrode slurry of setting volume is placed in container, records the initial position of described electrode slurry;
Described container is tilted according to set path, after inclination, start timing, the final position that recording electrode slurry arrives in setting-up time;
According to described initial position and final position, calculate the mobile distance of slurry, according to the levelability flowing apart from detecting electrode slurry.
Preferably, described container is transparent cylindrical container.
Preferably, described transparent cylindrical container is provided with base, and described base diameter is greater than a diameter.
Preferably, described transparent cylindrical container side wall is provided with mark line.
Preferably, described transparent cylindrical container side wall is also provided with scale mark, and described scale mark be take mark line as starting point, to vessel port direction, extends.
Preferably, the method is specially:
Described transparent cylindrical container is placed in to horizontal stand, electrode slurry is poured in described container to electrode slurry and reached mark line position;
Described container is tilted to vessel port exposure level platform to horizontal direction, then start timing, the maximum scale line mark number that recording electrode slurry reaches in setting-up time;
According to described maximum scale line mark, count the levelability of detecting electrode slurry.
Preferably, described container after tilting to vessel port exposure level platform, horizontal direction is also comprised: by the fixing step of described container.
Preferably, described transparent cylindrical container is placed in to the step that horizontal stand also comprises cleaning, drying container before.
The invention provides a kind of detection method of electrode slurry levelability, it is to measure the electrode slurry of setting volume in the mobile distance of setting under slant path and setting-up time, according to the levelability flowing apart from detecting electrode slurry.The method is to utilize the flowing property of slurry self to detect flow leveling.During test, only need to measure quantitative slurry in the mobile distance of setting under slant path and setting-up time.Easy and simple to handle, visual result.Experiment showed, that testing result accuracy is high.When measuring slurry levelability, those skilled in the art can first adopt standard slurry to determine the upper lower limit value of the mobile distance of this kind of slurry system, when homogenate, only need test according to the method described above, until the mobile distance of the slurry of preparing represents to meet demand in specialized range.
Accompanying drawing explanation
Fig. 1 is the structural representation of the container that adopts of the present invention.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these are described is for further illustrating the features and advantages of the present invention, rather than limiting to the claimed invention.
The embodiment of the invention discloses a kind of detection method of electrode slurry levelability, its method is: measure and set the mobile distance of long-pending electrode slurry in setting slant path and setting-up time, according to the levelability flowing apart from detecting electrode slurry.
The present invention carrys out the flow leveling of test slurry by investigating the fluid ability of slurry.In above-mentioned detection method, slurry volume, approach and time are all default fixed amounts, only having slurry is variable, the present invention is just consistent for guaranteeing the flox condition of different slurries to the setting of slurry volume, slant path and time in advance, and it is specifically measured or mode those skilled in the art can select and adjust according to factors such as test conditions.
During test, measure according to the method described above the mobile distance of different slurries, mobile distance far illustrates that flow leveling is better, and the pole piece surface density of being prepared by this slurry is more even.Those skilled in the art can be according to the requirement of surface density homogeneity bound, and correspondence goes out the bound of corresponding slurry levelability, the bound of the distance that flows.Afterwards, during for system homogenate of the same race, only need test according to the method described above, until the mobile distance of the slurry of preparing illustrates that in specialized range its levelability meets demand.
Said method preferably carries out in the following manner:
The electrode slurry of setting volume is placed in container, records the initial position of described electrode slurry;
Described container is tilted according to setting approach, after inclination, start timing, the final position that recording electrode slurry reaches in setting-up time;
According to described initial position and final position, calculate the mobile distance of slurry, according to the levelability flowing apart from detecting electrode slurry.
The shape of the container that said method is used can be test tube shaped, bowl-type etc.For the ease of observing, and material is flowed evenly in flow process, the present invention preferably adopts transparent columniform container.Further, in order to make the straight tube of container can form larger angle with surface level when tilting, so that for pulp flow provides larger expulsive force, make the levelability of different slurries more significantly be characterized out by the distance that flows.This transparent cylindrical container of selecting is preferably provided with base, and base diameter is greater than a diameter.
In order to guarantee the consistance of pulp flow condition not of the same race, the volume that need to control different testing sizes equates.For the ease of controlling the volume of testing size, the present invention also preferably arranges mark line at the sidewall of oolemma base hydrostatic column, during test, to pour in said vesse slurry so far mark line just stop charging, and then be convenient to the control to different usage of sizing agents.Meanwhile, this mark line also can be used for the initial position that mark slurry drops into.Further, for the ease of calculating the mobile distance of slurry, the present invention also preferably arranges scale mark on said vesse sidewall, and this scale mark be take mark line as starting point, to vessel port direction, extends.Thus, calculate pulp flow apart from time, only need read the corresponding graduated scale number of slurry distal-most end.
In sum, the present invention most preferably adopts container as shown in Figure 1, and this container is transparent vessel, and material is glass, and it comprises: vertical tube part 1, and be arranged at the base 2 of vertical tube part 1 bottom; Vertical tube part 1 sidewall is established mark line 101, and scale mark 102, and scale mark 102 be take mark line as starting point, to vessel port direction, extends.
The method that employing said vesse carries out the detection of slurry levelability is as follows:
Above-mentioned transparent cylindrical container is placed in to horizontal stand, electrode slurry is poured in described container to electrode slurry and reached mark line position;
Described container is tilted to vessel port exposure level platform to horizontal direction, then start timing, the maximum scale line mark number that recording electrode slurry reaches in setting-up time;
According to maximum scale line mark, count the levelability of detecting electrode slurry.
In addition, the present invention is also preferably container is tilted to the laggard fixing step of hydrostatic column of being about to of vessel port exposure level platform to horizontal direction, to prevent that container from rolling, and affects test result.
The clean-up performance of said vesse is on test result also impact to some extent, and for this reason, the present invention also preferably carried out the step of cleaning, drying container before described transparent cylindrical container is placed in to horizontal stand.
As shown in the above, the present invention utilizes the flowing property of slurry self to detect flow leveling.During test, only need to measure quantitative slurry in the mobile distance of setting under slant path and setting-up time.Easy and simple to handle, visual result.When measuring slurry levelability, those skilled in the art can first adopt standard slurry to determine the upper lower limit value of the mobile distance of this kind of slurry system, when homogenate, only need test according to the method described above, until the mobile distance of the slurry of preparing represents to meet demand in specialized range.
In order further to understand the present invention, below in conjunction with embodiment, the detection method of electrode slurry levelability provided by the invention is described, protection scope of the present invention is not limited by the following examples.
The mensuration environment of following examples is as follows:
Air humidity (35 ± 5) %RH
Temperature (20 ± 5) ℃
The container using is above-mentioned transparent cylindrical band base container as shown in Figure 1.
Embodiment 1
Get two kinds with system slurry, numbering is respectively slurry A and slurry B, respectively test in the following manner:
1, the container after cleaning in advance and drying is positioned on horizontal stand.Get slurry to be measured and topple over electrode slurry in solution, operator's eyes are equal with the mark line of container bottom, guarantee that slurry plane is just equal with mark line, topple in slurry process and need to guarantee slurry not to be stained with on the sidewall of Container Tag line with upper part, otherwise repeat above-mentioned steps after cleaning container need to being dried.
2, container is tilted slowly until vessel port exposure level face is fixed container position, start timing simultaneously, setting time of repose is 1min.
3, after 1min by container weather, be positioned over stably on surface level, read the scale mark mark number that slurry is left to farthest.Result is as follows:
Slurry A flows apart from 25cm
Slurry B flows apart from 21cm.
Use respectively slurry A and slurry B to be coated with on coating machine, obtain being coated with pole piece sheet, the surface density of two pole piece different parts of test, and calculate extreme difference according to the surface density result obtaining, extreme difference is less shows that pole piece surface density is more even, and the counter levelability of releasing slurry is better.The computing method of extreme difference are: the mean value of the difference of the value of test data and data mean value.Surface density and extreme difference test result are listed in table 1:
Table 1 surface density and extreme difference test result
From the above results, the pulp flow distance that adopts said method to measure is far away, and after coating, pole piece surface density is less, and this explanation slurry levelability is better, and the method is easy and simple to handle, visual result and comparatively accurate.
The explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. a detection method for electrode slurry levelability, is characterized in that, specifically comprises the following steps:
The electrode slurry of setting volume is placed in container, records the initial position of described electrode slurry;
Described container is tilted according to set path, after inclination, start timing, the final position that recording electrode slurry arrives in setting-up time;
According to described initial position and final position, calculate the mobile distance of slurry, according to the levelability flowing apart from detecting electrode slurry;
Described container is transparent cylindrical container;
Described transparent cylindrical container is provided with base, and described base diameter is greater than a diameter;
Described transparent cylindrical container side wall is provided with mark line;
Described transparent cylindrical container side wall is also provided with scale mark, and described scale mark be take mark line as starting point, to vessel port direction, extends.
2. detection method according to claim 1, is characterized in that, the method is specially:
Described transparent cylindrical container is placed in to horizontal stand, electrode slurry is poured in described container to electrode slurry and reached mark line position;
Described container is tilted to vessel port exposure level platform to horizontal direction, then start timing, the maximum scale line mark number that recording electrode slurry reaches in setting-up time;
According to described maximum scale line mark, count the levelability of detecting electrode slurry.
3. detection method according to claim 2, is characterized in that, described container is also comprised after horizontal direction tilts to vessel port exposure level platform: by the fixing step of described container.
4. detection method according to claim 2, is characterized in that, described transparent cylindrical container is placed in to the step that horizontal stand also comprises cleaning, drying container before.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210035187.XA CN102636412B (en) | 2012-02-16 | 2012-02-16 | Method for detecting leveling property of battery slurry |
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| CN201210035187.XA CN102636412B (en) | 2012-02-16 | 2012-02-16 | Method for detecting leveling property of battery slurry |
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| CN102636412B true CN102636412B (en) | 2014-04-09 |
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| CN103604724B (en) * | 2013-11-19 | 2015-10-28 | 河南海格尔高温材料有限公司 | A kind of experimental technique detecting the anti-stick slag of fire resistive material |
| CN105388088B (en) * | 2015-12-11 | 2017-09-15 | 湖南科技大学 | To lose the test device and method that flowing time characterizes aerated fluid congealing property |
| CN110057719B (en) * | 2018-01-18 | 2022-02-11 | 立邦涂料（中国）有限公司 | Detection and application of fixed point platform in workability of water-based high polymer material |
| CN108956378B (en) * | 2018-06-05 | 2023-09-26 | 江苏正力新能电池技术有限公司 | Slurry fluidity testing device and testing method thereof |
| CN111413251A (en) * | 2019-01-08 | 2020-07-14 | 上海深竹化工科技有限公司 | Leveling property testing method of leveling agent for coating |
| CN109781584A (en) * | 2019-03-15 | 2019-05-21 | 宁波石墨烯创新中心有限公司 | Levelability detection method and levelability detection device |
| CN112595630B (en) * | 2020-11-23 | 2023-05-09 | 上海航天化工应用研究所 | Device and method for testing leveling property of solid propellant slurry |
| CN113555521B (en) * | 2021-07-06 | 2022-12-27 | 江苏天鹏电源有限公司 | Method for rapidly detecting processing performance of lithium ion battery negative electrode slurry |
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