CN113075094A - Diaphragm wettability testing device and testing method thereof - Google Patents
Diaphragm wettability testing device and testing method thereof Download PDFInfo
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- CN113075094A CN113075094A CN202110347215.0A CN202110347215A CN113075094A CN 113075094 A CN113075094 A CN 113075094A CN 202110347215 A CN202110347215 A CN 202110347215A CN 113075094 A CN113075094 A CN 113075094A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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Abstract
The invention relates to a device for testing the wettability of a diaphragm, which comprises a test frame and a graduated scale, wherein two butterfly clamps are arranged on the test frame, an electrolyte container is arranged below the two butterfly clamps, a capillary tube is arranged on the electrolyte container, during testing, two ends of the diaphragm to be tested are clamped between the two butterfly clamps, the lower end of the capillary tube is immersed in the electrolyte, the upper end of the capillary tube is contacted with the diaphragm to be tested, and the graduated scale is transversely arranged on one side of the diaphragm to be tested; the invention also relates to a method for testing the wettability of the diaphragm, which comprises the steps of clamping the diaphragm to be tested by two butterfly clamps to transversely straighten the diaphragm to be tested; conveying the electrolyte in the electrolyte container to a diaphragm to be tested for a certain time t through a capillary, and timing from the contact of the electrolyte and the diaphragm to be tested; reading the diffusion length L of the electrolyte on the diaphragm to be tested through a graduated scale; the value of the wetting rate v is calculated by the wetting rate formula v ═ L/(2 × t). The invention can enable the electrolyte to transversely diffuse on the diaphragm, and the test precision is high.
Description
Technical Field
The invention relates to the technical field of lithium battery production, in particular to a device and a method for testing wettability of a diaphragm.
Background
Along with the concept of new energy is more and more popular, people also promote greatly the concern of lithium cell, and the lithium cell mainly contains four bibliographic categories: the electrolyte is injected after the anode, the cathode and the diaphragm are molded, so that the wettability of the diaphragm on the electrolyte is difficult to test, and the time for injecting the electrolyte into a coating diaphragm with poor wettability is long; in addition, for developing the ceramic coating, a battery is prepared by coating a diaphragm on each formula to evaluate the wettability of the battery to electrolyte, so that time and resources are wasted. Therefore, some manufacturers have developed membrane wettability testing devices.
When an existing diaphragm wettability testing device is used for testing, a diaphragm is vertically suspended, the lower end of the diaphragm is immersed in electrolyte, the electrolyte is enabled to be upwards diffused on the surface of the diaphragm, the diffusion length L and the diffusion time t are recorded, the infiltration rate v can be calculated according to the formula v which is L/t, the wettability of the diaphragm on the large side of the v value is good, and otherwise, the wettability is poor. However, due to the influence of gravity, the diffusion speed is reduced when the electrolyte goes upwards, so that the test precision error is large, and the effect is not ideal.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a diaphragm wettability testing device and a testing method thereof, which can avoid the influence of gravity, and have more uniform transverse diffusion speed of electrolyte, higher testing precision and better effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a diaphragm wettability testing arrangement, includes test jig and scale, be equipped with on the test jig and be used for the left holder and the right holder at both ends about the await measuring diaphragm of centre gripping, below between left side holder and the right holder is equipped with the electrolyte container that is used for holding electrolyte, be equipped with the capillary that makes the electrolyte upwards permeate on the electrolyte container, during the test, both ends centre gripping between left holder and right holder about the await measuring diaphragm, during the lower extreme of capillary immerses electrolyte, the upper end of capillary and the lower surface contact of the await measuring diaphragm, the scale transversely locates the one side of the await measuring diaphragm.
Preferably, the left clamping piece and the right clamping piece are butterfly clamps.
As a preferable scheme, the test frame is provided with a lifting platform for supporting the electrolyte container and a lifting driving mechanism for controlling the lifting platform to move up and down.
Preferably, the electrolyte container is a reagent bottle, a plug is arranged in an opening at the upper end of the reagent bottle, the plug is provided with a fine hole through which the capillary tube penetrates upwards, and a liquid injection port is arranged on the outer surface of the reagent bottle.
A membrane wettability testing method comprises the following steps:
the method comprises the following steps: the two ends of the diaphragm to be tested are respectively clamped by the left clamping piece and the right clamping piece, so that the diaphragm to be tested is transversely straightened;
step two: conveying the electrolyte in the electrolyte container to a diaphragm to be tested for a certain time t through a capillary, and timing from the contact of the electrolyte and the diaphragm to be tested;
step three: reading the diffusion length L of the electrolyte on the diaphragm to be tested through a graduated scale;
step four: the value of the wetting rate v is calculated by the wetting rate formula v ═ L/(2 × t).
Preferably, the length of the diaphragm to be tested is 19 cm-21 cm, and the width of the diaphragm to be tested is 0.4 cm-0.6 cm.
Preferably, the capillary tube has a length of 9cm to 11cm and a pore diameter of 0.04cm to 0.06 cm.
Preferably, in step two, the liquid level in the electrolyte container is the same at each test.
As a preferable scheme, in the second step, the time t is 1 min.
Preferably, in step two, the volume of the electrolyte in the electrolyte container is greater than 3/4 of the total volume of the electrolyte container.
Compared with the prior art, the invention has obvious advantages and beneficial effects, specifically, the diaphragm is transversely suspended by arranging the left clamping piece and the right clamping piece, the electrolyte in the electrolyte container is upwards transferred to the lower surface of the diaphragm by using the capillary, and the electrolyte is transversely diffused on the diaphragm, so that the influence of gravity is avoided, the diffusion speed is more uniform, the test precision is higher, and the effect is better; the butterfly clamp is adopted to facilitate the clamping or taking out of the diaphragm, and the operation is simple; the device simple structure sets up rationally, low in manufacturing cost, and the good reliability does benefit to the popularization.
To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions attained thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
The attached drawings indicate the following:
10-a test jig; 11-a base; 12-a left support bar;
121-left clamp; 122-left active block; 13-right support bar;
131-a right clamp; 132-right movable block; 14-a graduated scale;
15-power key; 16-an ascending bond; 17-a down bond;
18-stop key; 19-a lifting drive mechanism; 191-a lifting platform;
20-an electrolyte container; 21-an electrolyte; 22-rubber stopper;
221-pore; 23-liquid injection port; 24-a capillary tube;
25-diaphragm.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed and operated in specific orientations, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
As shown in fig. 1, a membrane wettability testing apparatus includes a testing jig 10 and a graduated scale 14, the graduated scale 14 is a steel scale, the testing jig 10 is provided with a left clamping member 121 and a right clamping member 131 for clamping the left and right ends of a membrane 25 to be tested, an electrolyte container 20 for containing electrolyte 21 is provided below between the left clamping member 121 and the right clamping member 131, the electrolyte container 20 is provided with a capillary 24 for allowing the electrolyte 21 to permeate upwards, during testing, the left and right ends of the membrane 25 to be tested are clamped between the left clamping member 121 and the right clamping member 131, the membrane 25 to be tested is in a transversely straightened state and its coating surface is downward, the lower end of the capillary 24 is immersed in the electrolyte 21, the upper end of the capillary 24 is in contact with the lower surface of the membrane 25 to be tested, the graduated scale 14 is transversely provided at one side of the membrane 25 to be tested, and the extending direction of the membrane 25 is parallel to, since the electrolyte 21 is a wetting liquid, the capillary 24 causes the electrolyte 21 to rise in the capillary 24 by capillary action, and when the electrolyte 21 rises to the upper end of the capillary 24 and comes into contact with the separator 25, the electrolyte 21 is transferred to the separator 25 and spreads.
The testing jig 10 comprises a base 11, and a left support rod 12 and a right support rod 13 which are arranged on the base 11, wherein the base 11, the left support rod 12 and the right support rod 13 are all made of stainless steel, a left movable block 122 which can be adjusted up and down is arranged on the left support rod 12, a right movable block 132 which can be adjusted up and down is arranged on the right support rod 12, a graduated scale 14 can be vertically adjusted and installed on the testing jig 10 through the left movable block 122 and the right movable block 132, a left clamping piece 121 can be vertically adjusted and installed on the left support rod 12 through the left movable block 122, a right clamping piece 131 can be vertically adjusted and installed on the right support rod 13 through the right movable block 132, the left movable block and the right movable block are arranged to realize vertical adjustment of the graduated scale 14 or the left clamping piece and the right clamping piece, the height of the graduated scale 14 or the height of a diaphragm 25 is conveniently adjusted, so that the graduated scale 14 can be read conveniently, the reagent bottle is characterized in that a lifting platform 191 for supporting an electrolyte container 20 and a lifting driving mechanism 19 for controlling the lifting platform 191 to move up and down are arranged on the base 11, a power key 15, a lifting key 16, a descending key 17 and a stopping key 18 are arranged on the base 11, the power key 15, the lifting key 16, the descending key 17 and the stopping key 18 are all connected with the lifting driving mechanism 19, the electrolyte container 20 is a reagent bottle, a rubber plug 22 is arranged in an opening in the upper end of the reagent bottle, the rubber plug 22 is provided with a fine hole 221 through which a capillary tube 24 penetrates upwards, and a liquid injection port 23 is formed in the outer surface of the reagent bottle.
The working principle of the invention is as follows: the contact point of the upper end of the capillary 24 and the membrane 25 to be tested is located in the center of the membrane 25 to be tested, the power key 15 is started, the lifting key 16 is started, the lifting table 191 drives the reagent bottle to lift, when the upper end of the capillary 24 is tangent to the membrane 25 to be tested, the stop key 18 is pressed to stop the lifting table 191 from moving upwards, timing is started, at the moment, the electrolyte 21 is soaked on the membrane 25 through the upper end of the capillary 24 and is diffused on the membrane 25, the electrolyte 21 in the reagent bottle is subjected to capillary phenomenon to uninterruptedly provide sufficient electrolyte 21 for the membrane 25, the timing is finished, the used time t is recorded, the descending key 17 is started, the lifting table 191 moves downwards to separate the upper ends of the membrane 25 and the capillary 24, and the stop key 18 is; the length L of the electrolyte 21 diffused on the diaphragm 25 can be read by the scale 14, and then the value of v is obtained according to the wetting rate v of the diaphragm 25 to the electrolyte 21 being L/(2 × t), the electrolyte 21 diffuses fast when the wettability is good, the electrolyte 21 diffuses slow when the wettability is poor, that is, the wettability of the diaphragm 25 to the electrolyte 21 is better when the value of v is larger, and the wettability of the diaphragm 25 to the electrolyte 21 is worse when the value of v is not so, so that the wettability of the diaphragm 25 to the electrolyte 21 is qualitatively determined.
The invention also discloses a method for testing the wettability of the diaphragm 25, which comprises the following steps:
the method comprises the following steps: the two ends of the diaphragm 25 to be tested are respectively clamped by the left clamping piece 121 and the right clamping piece 131, so that the diaphragm 25 to be tested is transversely straightened;
step two: conveying the electrolyte 21 in the electrolyte container 20 to a diaphragm 25 to be tested for a certain time t through a capillary 24, wherein the time t is counted from the contact of the electrolyte 21 and the diaphragm 25 to be tested, the time t is 1min, the liquid level height in the electrolyte container 20 is the same during each test, and the volume of the electrolyte 21 in the electrolyte container 20 is greater than 3/4 of the total volume of the electrolyte container 20;
step three: reading the length L of the electrolyte 21 spread on the diaphragm 25 to be tested by the scale 14;
step four: the value of the wetting rate v is calculated by the wetting rate formula v ═ L/(2 × t).
The membrane 25 to be tested has a length of 19cm to 21cm, preferably 20cm, and a width of 0.4cm to 0.6cm, preferably 0.5 cm.
The capillary 24 has a length of 9cm to 11cm, preferably 10cm, and a pore diameter of 0.04cm to 0.06cm, preferably 0.05 cm.
In conclusion, the diaphragm is transversely suspended by arranging the left clamping piece and the right clamping piece, the electrolyte in the electrolyte container is upwards transferred to the lower surface of the diaphragm by using the capillary, and the electrolyte is transversely diffused on the diaphragm, so that the influence of gravity is avoided, the diffusion speed is more uniform, the test precision is higher, and the effect is better; the butterfly clamp is adopted to facilitate the clamping or taking out of the diaphragm, and the operation is simple; the power supply, the ascending, descending and stopping keys are arranged on the base, so that the test operation of personnel is facilitated, the left and right movable blocks are arranged to realize the vertical adjustment of the graduated scale or the left and right clamping pieces, the height of the graduated scale or the diaphragm is conveniently adjusted, and the reading of the graduated scale is facilitated; the device simple structure sets up rationally, low in manufacturing cost, and the good reliability does benefit to the popularization.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the present invention, so that any modifications, equivalents, improvements, etc. made to the above embodiment according to the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a diaphragm wettability testing arrangement, its characterized in that, includes test jig and scale, be equipped with left holder and the right holder that is used for the centre gripping to await measuring diaphragm left and right ends on the test jig, below between left holder and the right holder is equipped with the electrolyte container that is used for holding electrolyte, be equipped with the capillary that makes electrolyte upwards permeate on the electrolyte container, during the test, both ends centre gripping between left holder and right holder about the examination diaphragm, the lower extreme of capillary is immersed in electrolyte, the upper end of capillary and the lower surface contact of the examination diaphragm of awaiting measuring, the scale transversely locates the one side of the examination diaphragm of awaiting measuring.
2. The membrane wettability testing device according to claim 1, wherein each of the left clamping member and the right clamping member is a butterfly clamp.
3. The membrane wettability testing device of claim 2, wherein the testing jig is provided with a lifting table for supporting the electrolyte container and a lifting driving mechanism for controlling the lifting table to move up and down.
4. The membrane wettability testing device according to claim 1 or 3, wherein the electrolyte container is a reagent bottle, a stopper is arranged in an opening at the upper end of the reagent bottle, the stopper is provided with a fine hole through which a capillary tube passes upwards, and an injection port is formed in the outer surface of the reagent bottle.
5. A membrane wettability testing method is characterized by comprising the following steps:
the method comprises the following steps: the two ends of the diaphragm to be tested are respectively clamped by the left clamping piece and the right clamping piece, so that the diaphragm to be tested is transversely straightened;
step two: conveying the electrolyte in the electrolyte container to a diaphragm to be tested for a certain time t through a capillary, and timing from the contact of the electrolyte and the diaphragm to be tested;
step three: reading the diffusion length L of the electrolyte on the diaphragm to be tested through a graduated scale;
step four: the value of the wetting rate v is calculated by the wetting rate formula v ═ L/(2 × t).
6. The method for testing wettability of a membrane according to claim 5, wherein said membrane to be tested has a length ranging from 19cm to 21cm and a width ranging from 0.4cm to 0.6 cm.
7. The method for testing wettability of a diaphragm according to claim 5, wherein said capillary has a length of 9cm to 11cm and a pore diameter of 0.04cm to 0.06 cm.
8. The method for testing wettability of a separator according to claim 5, wherein in the second step, the liquid level in the electrolyte container is the same for each test.
9. The membrane wettability testing method according to claim 5, wherein, in the second step, said time t is 1 min.
10. The membrane wettability testing method according to claim 5, wherein in the second step, the volume of the electrolyte in the electrolyte container is greater than 3/4 of the total volume of the electrolyte container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347215.0A CN113075094A (en) | 2021-03-31 | 2021-03-31 | Diaphragm wettability testing device and testing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347215.0A CN113075094A (en) | 2021-03-31 | 2021-03-31 | Diaphragm wettability testing device and testing method thereof |
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| CN113075094A true CN113075094A (en) | 2021-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834758A (en) * | 2021-09-22 | 2021-12-24 | 蜂巢能源科技有限公司 | Method and device for testing battery core pole group wetting performance |
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2021
- 2021-03-31 CN CN202110347215.0A patent/CN113075094A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834758A (en) * | 2021-09-22 | 2021-12-24 | 蜂巢能源科技有限公司 | Method and device for testing battery core pole group wetting performance |
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