CN107655790B - Method for measuring uniformity of battery slurry - Google Patents

Method for measuring uniformity of battery slurry Download PDF

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Publication number
CN107655790B
CN107655790B CN201710712987.3A CN201710712987A CN107655790B CN 107655790 B CN107655790 B CN 107655790B CN 201710712987 A CN201710712987 A CN 201710712987A CN 107655790 B CN107655790 B CN 107655790B
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sampling
uniformity
container
slurry
rod
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CN107655790A (en
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席凯凯
谭倩
陈芳杰
李华青
郭要磊
仲启方
牛猛卫
赵永锋
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Guangxi Ningfu New Energy Technology Co ltd
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Multi Fluorine New Energy Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
    • G01N9/04—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of fluids

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Abstract

The invention relates to a method for measuring the uniformity of battery slurry, which comprises the following steps of 1) sampling different positions in a material container by a slurry sampler; 2) and calculating the density of the samples taken at different positions, and judging the uniformity of the slurry in the material container according to the density of the samples at different positions. The method for judging whether the slurry in the material containing container is uniform or not by sampling different positions, calculating the sample density of the different positions and analyzing whether the density is uniform or not is easy to operate and simple to calculate, can effectively obtain the uniformity of the slurry, and provides reliability guarantee for the consistency of electrochemical performances such as internal resistance, capacity and the like of the lithium ion battery in subsequent processing and manufacturing processes.

Description

Method for measuring uniformity of battery slurry
Technical Field
The invention relates to a method for measuring uniformity of battery slurry.
Background
The lithium ion battery has high energy density, wide temperature working range and excellent cycle performance, is widely applied to portable computers, cameras, video cameras, electric tools and hybrid electric vehicles, and is applied to artificial satellites, aerospace and energy storage to solve the problems of energy loss, environmental pollution and the like at present.
One of the most important steps in the manufacturing process of the lithium electronic battery is slurry mixing, and the slurry includes a solvent, an active material, a conductive agent, a binder, and the like. Whether the prepared slurry is uniform or not has important influence on the consistency of electrochemical properties such as internal resistance, capacity and the like of the battery, so that the uniformity of the slurry in the material containing container is measured by taking the slurry. In order to solve the problem, chinese patent application publication No. CN106324003A, application publication No. 2017.01.11, discloses a quantitative analysis method for the mixing uniformity (uniformity) of electrode raw materials for a supercapacitor, the analysis method comprises the steps of marking the raw materials of the electrode for the supercapacitor with a tracer, mixing the raw materials into slurry, quantitatively detecting the content of the tracer in the mixed slurry, calculating the relative standard deviation of the content of the tracer detected at different positions of a mixing device after the electrode raw materials are mixed, and analyzing the mixing uniformity of the electrode raw materials. However, the method for measuring uniformity by using the tracer is high in cost, and the calculation of the relative standard deviation of the content of the tracer detected at different positions of the mixing equipment after the electrode raw materials are mixed is troublesome.
Disclosure of Invention
The invention aims to provide a method for measuring uniformity of battery slurry, which aims to solve the problems of high cost when a tracer is used for measuring the uniformity and large calculation amount of relative standard deviation of contents of the tracer at different positions.
In order to achieve the above object, a first technical solution of the method for measuring uniformity of battery paste of the present invention is: the method for measuring the uniformity of battery slurry comprises the following steps of 1) sampling different positions in a material container by a slurry sampler; 2) and calculating the density of the samples taken at different positions, and judging the uniformity of the slurry in the material container according to the density of the samples at different positions.
The second technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of the first technical scheme of the method for measuring the uniformity of the battery slurry, at least two sampling containers are arranged on a sampling rod of a slurry sampler, so that the slurry sampler can take at least two samples at one time. Through set up two at least sample containers on the thief rod, realized once can getting the thick liquids of many places in the feed cylinder, be favorable to the measurement of thick liquids homogeneity.
The third technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of the second technical scheme of the method for measuring the uniformity of the battery slurry, at least two sampling containers are arranged along the axial direction of the sampling rod, so that the sampling rod can take at least two samples at one time in the axial direction of the sampling rod. The slurry at the left and right parts in the charging barrel can be obtained, and the uniformity of measurement is ensured.
The fourth technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of the second technical scheme of the method for measuring the uniformity of the battery slurry, at least two sampling containers are arranged along the radial direction of the sampling rod, so that the sampling rod can take at least two samples at a time in the radial direction of the sampling rod. The slurry at the upper part and the lower part in the charging barrel can be obtained, and the uniformity of measurement is ensured.
The fifth technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of any one of the second to fourth technical solutions of the method for measuring the uniformity of battery slurry, the sampling containers are detachably connected with the sampling rod, and the fixed volume of each sampling container is set as V1、V2、……VnAnd mass m1、m2、……mnIn step 2), the total mass M of the individual sampling containers and samples removed from the sampling rod is weighed1、M2、……Mn(ii) a The density ρ of the sample in each sampling vessel is then calculated according to the formula ρ = (M-M)/V1、ρ2、……ρnAccording to the density of the sample in each sampling vessel ρ1、ρ2、……ρnThe size of the slurry in the material containing container is judged.
The sixth technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of the fifth technical scheme of the method for measuring the uniformity of the battery slurry, the detachable connection of the sampling container and the sampling rod is realized through threaded connection. The threaded connection is convenient for the sampling container to be detached from the sampling rod when being weighed.
The seventh technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of any one of the second to fourth technical solutions of the method for measuring the uniformity of battery slurry according to the present invention, the volume of at least one of the sampling containers on the sampling rod is smaller than the volume of each of the other sampling containers. The phenomenon that the slurry has particle agglomeration and is uniformly dispersed during sampling is avoided, and the uniformity measurement is influenced.
The eighth technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of any one of the second to fourth technical solutions of the method for measuring the uniformity of battery slurry according to the present invention, the sampling container is provided with a sampling port, the sampling port is provided with an internal valve, and the sampling container controls the opening of the internal valve through a switch and a switch line to perform sampling.
The ninth technical scheme of the method for measuring the uniformity of the battery slurry is as follows: on the basis of the eighth technical scheme of the method for measuring the uniformity of the battery slurry, an interlayer is arranged on the wall of the container of the sampling container, and the switch line is arranged in the interlayer of the wall of the container. The interlayer facilitates protection of the switch wire.
The invention has the beneficial effects that: compared with the prior art, the method has the advantages that the sample density at different positions is calculated by sampling at different positions, and then whether the density is consistent or not is analyzed to judge whether the slurry in the material containing container is uniform or not, so that the operation is easy, the calculation is simple, the uniformity of the slurry can be effectively obtained, and the reliability guarantee is provided for the consistency of the electrochemical performances such as internal resistance, capacity and the like of the lithium ion battery in the subsequent processing and manufacturing processes.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a slurry sampler of the present invention;
FIG. 2 is a schematic diagram of the sampling vessel of FIG. 1;
FIG. 3 is a schematic diagram of a second embodiment of a slurry sampler of the present invention;
FIG. 4 is a schematic view of a third embodiment of a slurry sampler of the present invention;
fig. 5 is a schematic diagram of a fourth embodiment of a slurry sampler of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The first embodiment of the method for measuring the uniformity of battery slurry according to the present invention is shown in fig. 1 and fig. 2, a sampler 1 is used for sampling, the slurry sampler 1 comprises a sampling rod 2 and a sampling container 3 connected with the sampling rod 2, the sampling rod 2 is a straight rod with a certain length, the sampling rod 2 is respectively distributed with a plurality of sampling containers 3 in the axial direction and the radial direction, the sampling containers 3 are provided with sampling ports, and the sampling containers 3 distributed in multiple points ensure the uniformity of sampling, so that all points in the material container can be obtained; the sampling containers 3 are different in size, and the purpose of the arrangement is to avoid the situation that particles in slurry are agglomerated but dispersed uniformly during sampling, so that the uniformity measurement is inaccurate due to the fact that all the particles are agglomerated inside the small balls or all the solvent is used inside the small balls.
In the above, the upper end of the sampling container 3 is provided with the connector 6, the connector 6 is tapped with threads, the sampling container 3 is connected with the sampling rod 2 in a threaded manner, and the sampling container 3 can be conveniently detached from the sampling rod during weighing by adopting the connection mode; the utility model discloses a sampling device, including sampling container 3, sampling rod, built-in valve 4, intermediate layer 7, switch line 5, switch line 4, the switching of switch line 4, and the switching of switch control built-in valve 4 is connected to the sampling rod and through the switch control built-in valve 4 of sampling rod upper end on the sample connection department on sampling container 3, be equipped with intermediate layer 7 on sampling container 3's the container wall, be equipped with switch line 5 in the intermediate layer 7, the one end of switch line links to each other with built-in valve 4, and the other end is connected to the sample rod and through the switching of the switch control built-in valve 4 of sampling rod upper end, sets.
In the concrete implementation, a sampling rod 2 with at least two sampling containers 3 is vertically placed in a material containing container for sampling, wherein the sampling rod 2 and the sampling containers 3 form a slurry sampler 1; during sampling, after the sampling containers 3 with different volume sizes are fully immersed into the material container, the sampling port of each sampling container 3 is opened, the sampling rod 2 is lifted upwards from the material container after the sampling containers 3 are full, and the sampling ports of the sampling containers 3 are closed under the pressure of samples in the sampling containers 3; after each sampling vessel 3 has been removed from the receiving vessel, the respective sampling vessel 3 is removed from the sampling rod 2 and the total mass M of the respective sampling vessel 3 and the sample is measured1、M2、……MnLet the fixed volume of each sampling vessel 3 be V1、V2、……VnAnd mass m1、m2、……mnThen, the density ρ of the sample in each sampling vessel 3 is calculated according to the formula ρ = (M-M)/V1、ρ2、……ρnComparing the density ρ of the sample in each sampling vessel 31、ρ2、……ρnWhether the sizes are close or not, if so, the mixture is uniform, and the closer the sizes are, the higher the uniformity of the slurry is.
The second embodiment of the method for measuring the uniformity of battery slurry according to the present invention, as shown in fig. 3, is different from the first embodiment in that the sampling container may be replaced with an elliptical sampling container.
The third embodiment of the method for measuring uniformity of battery slurry according to the present invention, as shown in fig. 4, is different from the first embodiment in that the volume of the sampling container 3 is the same.
In a fourth embodiment of the method for measuring uniformity of battery slurry according to the present invention, as shown in fig. 5, the difference from the first embodiment is that the sampling port of the sampling container 3 is located at the uppermost end of the sampling container 3 after being connected to the sampling rod 2.
In this embodiment, the slurry sampler takes slurries at different positions in the container at one time for densitometric analysis, and in other embodiments, the slurry sampler may take slurries at different positions in the container multiple times for densitometric analysis.
In this embodiment, the density of the sample is determined by weighing the total mass of each sampling vessel and sample minus the mass of each sampling vessel divided by the volume of the sampling vessel, and in other embodiments, if the volume of the vessel is not easily calculated, the sample in the sampling vessel may be poured into a measuring cup to measure the volume of the sample in each sampling vessel and the total mass of the sample and the measuring cup, and then the density of the sample may be calculated by dividing the total mass of the sample and the measuring cup minus the mass of the measuring cup by the volume of the measuring cup.

Claims (5)

1. The method for measuring the uniformity of the battery slurry is characterized by comprising the following steps: the method comprises the following steps of 1) sampling different positions in a material containing container by using a slurry sampler; 2) calculating the density of the samples taken at different positions, and judging the uniformity of the slurry in the material container according to the density of the samples at different positions; set up two at least sample containers on the thief rod of thick liquids sampler, make thick liquids sampler once can get two at least samples, make two at least sample containers along the radial arrangement of thief rod, make the thief rod can once get two at least samples in its footpath, sample container and thief rod releasable connection, it is V to establish the fixed volume of every sample container1、V2、……VnAnd mass m1、m2、……mnIn step 2), the total mass M of the individual sampling containers and samples removed from the sampling rod is weighed1、M2、……Mn(ii) a The density ρ of the sample in each sampling vessel is then calculated according to the formula ρ = (M-M)/V1、ρ2、……ρnAccording to the density of the sample in each sampling vessel ρ1、ρ2、……ρnThe size of the sampling rod judges the uniformity of the slurry in the material containing container, and the volume of at least one of the sampling containers on the sampling rod is smaller than the volume of the rest sampling containers.
2. The method for measuring the uniformity of a battery paste according to claim 1, wherein: at least two sampling containers are arranged along the axial direction of the sampling rod, so that the sampling rod can take at least two samples at a time in the axial direction of the sampling rod.
3. The method for measuring the uniformity of a battery paste according to claim 1, wherein: the detachable connection of the sampling container to the sampling rod is realized by a threaded connection.
4. The method for measuring the uniformity of a battery paste according to claim 1 or 2, characterized in that: the sampling container is provided with a sampling port, the sampling port is provided with a built-in valve, and the sampling container controls the opening of the built-in valve through a switch and a switch wire to sample.
5. The method of measuring the uniformity of a battery paste according to claim 4, wherein: an interlayer is arranged on the wall of the sampling container, and the switch wire is arranged in the interlayer of the wall of the sampling container.
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CN109211714A (en) * 2018-10-31 2019-01-15 桑顿新能源科技有限公司 A kind of evaluation method of pulp of lithium ion battery stability
CN112285061A (en) * 2019-07-24 2021-01-29 天津工业大学 Method for quantitatively evaluating distribution uniformity degree of titanium powder added in high-solid-phase-content ceramic slurry by laser reflection method
CN112285066A (en) * 2019-07-24 2021-01-29 天津工业大学 Method for quantitatively evaluating distribution uniformity degree of titanium powder added into low-solid-phase-content zirconia slurry by laser transmission method
CN112945791A (en) * 2021-02-18 2021-06-11 大连中比动力电池有限公司 Evaluation method for dispersibility of lithium ion secondary battery slurry
CN113804582A (en) * 2021-09-29 2021-12-17 移动源特种纤维(河南)有限公司 Gasket slurry preparation testing device and automatic detection method thereof

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CN101551369A (en) * 2008-03-31 2009-10-07 深圳市比克电池有限公司 Method for testing sizing agent consistency and coating roller
CN201561875U (en) * 2009-12-19 2010-08-25 谢德健 Water sample collector
CN102207479A (en) * 2010-03-31 2011-10-05 深圳市比克电池有限公司 Method for detecting dispersing uniformity of lithium ion battery slurry
CN102854084B (en) * 2012-08-15 2015-05-13 深圳市德方纳米科技股份有限公司 Method for assessing settleability and uniformity of lithium ion battery anode slurry
CN102841043A (en) * 2012-08-28 2012-12-26 华南理工大学 Ceramic slurry stability detecting device and using method thereof
CN106299372A (en) * 2016-08-31 2017-01-04 天津市捷威动力工业有限公司 A kind of method improving slurry dispersion stabilization and coating homogeneity

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Address after: 454191 Industrial Cluster Area, Jiaozuo City, Henan Province, Standardized Workshop Area on the North Side of Xinyuan Road, West Park

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Address before: 454191 Henan Jiaozuo industrial agglomeration area, West Park, Xinyuan Road, north side of the standardization workshop.

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Address before: 454191 Industrial Cluster Area, Jiaozuo City, Henan Province, Standardized Workshop Area on the North Side of Xinyuan Road, West Park

Patentee before: Multi-fluorine New Energy Technology Co.,Ltd.