CN218974078U - Testing device for quantitatively evaluating wettability of electrolyte - Google Patents
Testing device for quantitatively evaluating wettability of electrolyte Download PDFInfo
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- CN218974078U CN218974078U CN202221657469.9U CN202221657469U CN218974078U CN 218974078 U CN218974078 U CN 218974078U CN 202221657469 U CN202221657469 U CN 202221657469U CN 218974078 U CN218974078 U CN 218974078U
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- electrolyte
- wettability
- diaphragm
- quantitatively evaluating
- test device
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 95
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000005303 weighing Methods 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 238000011158 quantitative evaluation Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 229910052744 lithium Inorganic materials 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000004760 aramid Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to the technical field of lithium batteries, in particular to a testing device for quantitatively evaluating wettability of electrolyte, which comprises the following components: the support is vertically hung with a diaphragm; the electrolyte containing bottle is correspondingly arranged below the bracket, electrolyte is contained in the electrolyte containing bottle, the diaphragm and the electrolyte are arranged at intervals, and in a test state, the diaphragm is at least partially immersed in the electrolyte; and the electrolyte containing bottle is arranged on the weighing device, and the weighing device weighs the weight change of the electrolyte. The testing device for quantitatively evaluating the wettability of the electrolyte can quantitatively represent the wettability effect of the electrolyte, has high accuracy, and has the advantages of simple structure, convenient operation, short detection time and strong practicability.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a testing device for quantitatively evaluating wettability of electrolyte.
Background
The lithium ion battery has the advantages of high voltage, high energy density, high safety, low self-discharge rate and the like, and is a promising new energy source. Research data indicate that cells with poor cycling performance are often associated with electrolyte wetting effects on the pole pieces and separator. When electrolyte is soaked, an ion transmission path becomes far away, so that shuttling of lithium ions between positive and negative electrodes is blocked, a pole piece which is not contacted with the electrolyte cannot participate in electrochemical reaction of a battery, meanwhile, the interface resistance of the battery is increased, the multiplying power performance, the discharge capacity and the service life of the lithium battery are affected, but too much electrolyte injection amount also causes the problems of energy density reduction, cost rise and the like of the lithium ion battery, so that the balance between performance and cost of the related lithium ion battery is very important.
Disclosure of Invention
The utility model aims to solve the technical problems that: in order to solve the technical problem of poor wettability caused by too large or too small electrolyte injection amount in the prior art. The utility model provides a testing device for quantitatively evaluating the wettability of electrolyte, which is used for determining the injection amount of the electrolyte by measuring the wettability of the electrolyte to a diaphragm, so that a proper amount of electrolyte is injected, the performance of a battery is ensured, and the production cost is not increased. The technical scheme adopted for solving the technical problems is as follows: a test device for quantitatively evaluating wettability of an electrolyte, comprising:
the support is vertically hung with a diaphragm;
the electrolyte containing bottle is correspondingly arranged below the bracket, electrolyte is contained in the electrolyte containing bottle, the diaphragm and the electrolyte are arranged at intervals, and in a test state, the diaphragm is at least partially immersed in the electrolyte;
and the electrolyte containing bottle is arranged on the weighing device, and the weighing device weighs the weight change of the electrolyte.
Further, in order to ensure the tightness of the electrolyte, a bottle cap is arranged on the electrolyte containing bottle, and a small hole is arranged on the bottle cap.
Further, the diaphragm is connected with the support through a rope, the diaphragm is arranged in the electrolyte containing bottle, and the rope penetrates through the small hole in the bottle cover and is fixedly connected with the support.
Further, in order to facilitate the movement of the diaphragm in the up-down direction, the support comprises a transverse support and a longitudinal support which are arranged perpendicular to each other, the transverse support is arranged at the upper end of the longitudinal support, and the transverse support can move up and down along the longitudinal support.
Further, in order to ensure perpendicularity of the diaphragm in the electrolyte filling bottle, an aluminum foil is arranged at one end, close to the electrolyte, of the diaphragm.
Further, in order to ensure the tightness of the electrolyte, the measurement accuracy is further ensured, the diameter of the small hole on the bottle cap is slightly larger than that of the thread rope, and the thread rope and the bottle cap are arranged at intervals.
Further, the rope is an iron wire rope.
Further, in order to facilitate the fixation of the ropes and the transverse brackets, the transverse brackets are provided with clamps, and the upper ends of the ropes are clamped on the clamps.
Further, the weighing device is an electronic balance.
The testing device for quantitatively evaluating the wettability of the electrolyte has the beneficial effects that the weight of the electrolyte is firstly weighed through the weighing device, and then the diaphragm is contacted with the electrolyte, so that the electrolyte infiltrates the diaphragm, the electronic balance readings are recorded at intervals, and the readings are marked as m according to the sequence of the readings 1 、m 2 、m 3 、m 4 、m 5 、m 6 ……m x When m is x -m x-1 When approaching 0, stopping recording and calculating m x -m 0 The wettability of the electrolyte on the diaphragm can be quantitatively represented, and the required liquid injection amount is further determined by measuring the wettability of the diaphragm, so that a proper amount of electrolyte is injected, the performance of the battery is ensured, and meanwhile, the production cost is not increased.
Drawings
The utility model will be further described with reference to the drawings and examples.
FIG. 1 is a schematic structural diagram of a test device for quantitatively evaluating wettability of an electrolyte.
In the figure:
10. a bracket; 11. a transverse bracket; 12. a longitudinal support; 13. a clamp; 20. an electrolyte; 30. a diaphragm; 40. electrolyte is filled in a bottle; 41. a bottle cap; 50. a weighing device; 60. a string.
Detailed Description
The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, which is a preferred embodiment of the present utility model, a test device for quantitatively evaluating wettability of an electrolyte, comprises: the electrolyte filling bottle 40 is correspondingly arranged below the support 10, electrolyte 20 is filled in the electrolyte filling bottle 40, the separator 30 and the electrolyte 20 are arranged at intervals, in a test state, the separator 30 is at least partially immersed in the electrolyte 20, the electrolyte filling bottle 40 is placed on the weighing device 50, the weighing device 50 weighs the weight change of the electrolyte 20, and the weighing device 50 is an electronic balance.
The bracket 10 comprises a transverse bracket 11 and a longitudinal bracket 12 which are arranged vertically to each other, the transverse bracket 11 is arranged at the upper end of the longitudinal bracket 12, and the transverse bracket 11 can move up and down along the longitudinal bracket 12.
The electrolyte containing bottle 40 is provided with a bottle cap 41, the bottle cap 41 is provided with a small hole, the diaphragm 30 is connected with the support 10 through a rope 60, the diaphragm 30 is arranged in the electrolyte containing bottle 40, the rope 60 penetrates through the small hole in the bottle cap 41 and is fixedly connected with the support 10, the rope 60 is an iron wire rope, the transverse support 11 is provided with a clamp 13, the upper end of the rope 60 is clamped on the clamp 13, the diameter of the small hole in the bottle cap 41 is slightly larger than that of the rope 60, and the rope 60 and the bottle cap 41 are arranged at intervals.
An aluminum foil is provided at one end of the separator 30 near the electrolyte 20.
Test procedure of the test device for quantitative evaluation of wettability of electrolyte 20:
step 1, horizontally placing an electronic balance, leveling to zero, taking a proper amount of electrolyte 20, placing the electrolyte into an electrolyte filling bottle 40, and placing the electrolyte filling bottle 40 filled with the electrolyte 20 on the electronic balance;
step 2, flattening the diaphragm 30, cutting into strips with the length of 2 m and the length of 5cm, rolling an aluminum foil with the length of 2 m and the length of 3cm into a aluminum foil with the length of 2 m and the length of 0.5cm, and fixing the aluminum foil at one end of the diaphragm 30;
step 3, hanging the other end of the diaphragm 30 on a hook of an iron wire rope, and carrying out static elimination treatment on the diaphragm 30 by using a static elimination instrument to prevent the diaphragm 30 from being stuck to the wall of the electrolyte containing bottle 40, thereby influencing the measurement result;
step 4, taking down the bottle cap 41 of the electrolyte containing bottle 40, enabling one end of the wire rope which is not hung to pass through a small hole on the bottle cap 41, arranging the diaphragm 30 in the electrolyte containing bottle 40 (not contacted with the liquid level of the electrolyte 20), screwing the bottle cap 41, enabling one end of the wire rope to pass through the small hole and then be fixed in the clamp 13 on the transverse support 11 (the wire rope is not contacted with the small hole), and recording the mass of the wire rope as m when the electronic balance is stable 0 ；
Step 5, adjusting the transverse support 11 to drive the diaphragm 30 to move downwards to contact with the electrolyte 20, recording an electronic balance indication at intervals of 2 seconds, and recording as m 1 、m 2 、m 3 、m 4 、m 5 、m 6 ……，m x -m x-1 When approaching 0, stopping recording and calculating m x -m 0 I.e., the wettability of the electrolyte 20 on the separator 30 can be quantitatively characterized.
Example 1:
dividing the diaphragm sprayed with the ceramic into A, B, C sections, respectively carrying out wettability tests, recording the numerical values on an electronic balance every 2s with different initial electrolyte masses, wherein the data are as follows:
example 2:
dividing the diaphragm coated with the aramid fibers into A, B, C sections, respectively carrying out wettability tests, recording numerical values on an electronic balance every 2s, wherein the initial electrolyte mass of the three tests is different, and the data are as follows:
example 3:
dividing the diaphragm without the coating layer into A, B, C three sections, respectively carrying out wettability tests, wherein the initial electrolyte masses of the three tests are different, and recording the numerical value on an electronic balance every 2s, wherein the data are as follows:
as can be seen by comparing examples 1, 2, 3:
in each example, the electrolyte is uniformly divided into A, B, C groups, the initial electrolyte is inconsistent, and the final delta m is consistent, namely the wettability of the electrolyte to the diaphragm in each example is consistent; in the three embodiments, the electrolyte wettability of the ceramic coating film and the aramid coating film is close to each other and is larger than that of the base film.
In summary, the testing device for quantitatively evaluating the wettability of the electrolyte can quantitatively represent the wettability effect of the electrolyte, has high accuracy, and has the advantages of simple structure, convenient operation, short detection time and strong practicability.
With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined as the scope of the claims.
Claims (9)
1. A test device for quantitatively evaluating wettability of an electrolyte, comprising:
a bracket (10), wherein a diaphragm (30) is vertically hung on the bracket (10);
the electrolyte filling bottle (40) is correspondingly arranged below the bracket (10), the electrolyte filling bottle (40) is filled with electrolyte (20), the diaphragm (30) and the electrolyte (20) are arranged at intervals, and in a test state, the diaphragm (30) is at least partially immersed in the electrolyte (20);
-a weighing device (50), said electrolyte-containing bottle (40) being placed on said weighing device (50).
2. The test device for quantitatively evaluating wettability of an electrolyte according to claim 1, wherein a cap (41) is provided on the electrolyte containing bottle (40), and a small hole is provided on the cap (41).
3. The test device for quantitatively evaluating wettability of an electrolyte according to claim 2, wherein the diaphragm (30) is connected to the support (10) by a string (60), the diaphragm (30) is disposed in the electrolyte-containing bottle (40), and the string (60) is fixedly connected to the support (10) through a small hole in the cap (41).
4. A test device for quantitatively evaluating wettability by an electrolyte according to claim 3, wherein the holder (10) comprises a transverse holder (11) and a longitudinal holder (12) which are arranged perpendicularly to each other, the transverse holder (11) being arranged at an upper end of the longitudinal holder (12), the transverse holder (11) being movable up and down along the longitudinal holder (12).
5. A test device for quantitatively evaluating the wettability of an electrolyte according to claim 3, characterized in that the membrane (30) is provided with an aluminum foil at the end close to the electrolyte (20).
6. A test device for quantitatively evaluating the wettability of an electrolyte according to claim 3, wherein the diameter of the small hole in the cap (41) is slightly larger than the diameter of the string (60), and the string (60) and the cap (41) are spaced apart.
7. The test device for quantitative evaluation of electrolyte wettability according to claim 6, wherein the string (60) is a wire string.
8. The test device for quantitatively evaluating wettability by an electrolyte according to claim 4, wherein a clamp (13) is provided on the lateral bracket (11), and an upper end of the wire (60) is clamped on the clamp (13).
9. Test device for the quantitative evaluation of the wettability by an electrolyte according to claim 1, characterized in that the weighing device (50) is an electronic balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221657469.9U CN218974078U (en) | 2022-06-29 | 2022-06-29 | Testing device for quantitatively evaluating wettability of electrolyte |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221657469.9U CN218974078U (en) | 2022-06-29 | 2022-06-29 | Testing device for quantitatively evaluating wettability of electrolyte |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218974078U true CN218974078U (en) | 2023-05-05 |
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ID=86167393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221657469.9U Active CN218974078U (en) | 2022-06-29 | 2022-06-29 | Testing device for quantitatively evaluating wettability of electrolyte |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218974078U (en) |
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2022
- 2022-06-29 CN CN202221657469.9U patent/CN218974078U/en active Active
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