CN217385318U - Lithium ion electrolyte lithium salt concentration detection device based on concentration cell - Google Patents
Lithium ion electrolyte lithium salt concentration detection device based on concentration cell Download PDFInfo
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- CN217385318U CN217385318U CN202122980384.6U CN202122980384U CN217385318U CN 217385318 U CN217385318 U CN 217385318U CN 202122980384 U CN202122980384 U CN 202122980384U CN 217385318 U CN217385318 U CN 217385318U
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- lithium
- electrolyte
- plastic bags
- aluminum
- detection device
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 49
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 229910003002 lithium salt Inorganic materials 0.000 title claims abstract description 23
- 159000000002 lithium salts Chemical class 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 3
- OPHUWKNKFYBPDR-UHFFFAOYSA-N copper lithium Chemical compound [Li].[Cu] OPHUWKNKFYBPDR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 4
- 102000004310 Ion Channels Human genes 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The utility model provides a lithium ion electrolyte lithium salt concentration detection device based on concentration difference battery, which comprises two sealed aluminum-plastic bags, two lithium electrodes and a voltage detector; the two sealed aluminum-plastic bags are filled with electrolytes with different concentrations, communicated through a capillary tube, and provided with a valve; the two lithium electrodes are respectively inserted into the electrolyte of the two sealed aluminum-plastic bags, the two lithium electrodes are respectively connected with nickel tabs, and the two nickel tabs are connected with a voltage detector through a wire. The utility model discloses an aluminum-plastic bag is sealed, has guaranteed whole testing arrangement's leakproofness, switches on two sealed aluminum-plastic bags through the capillary of taking the valve, has formed ion channel promptly, avoids electrolyte intermixture in two sealed aluminum-plastic bags again, has guaranteed the accuracy of experiment.
Description
Technical Field
The utility model relates to a lithium cell technical field especially relates to a lithium ion electrolyte lithium salt concentration detection device based on concentration cell.
Background
Lithium ion batteries are widely used because of their advantages such as high energy density and good cycle performance. The lithium ion battery electrolyte is used as a main component of the lithium ion battery, and has great influence on the battery performance. LiPF (lithium ion particle Filter) 6 As the electrolyte of the electrolyte, the content of the electrolyte directly affects the conductivity of the electrolyte, and finally affects the performance of the lithium ion battery.
At present, the lithium salt in the lithium battery electrolyte is measured by mainly using means such as an ion chromatograph, an atomic absorption spectrophotometer and the like to measure the concentration of the lithium salt in the electrolyte, and the method has larger relative error; also conversion of PF 6-to
The content of lithium salt is measured, but the pretreatment of the method needs longer time; in other methods, an ion chromatograph is adopted to detect the content of PF 6-in the electrolyte to be detected, and a potentiometric titrator is adopted to detect F in the electrolyte to be detected - The content of the lithium salt in the lithium ion battery electrolyte is obtained by calculation, and the method is complex to operate. Therefore, it is very important in the field of lithium ion batteries to find a method for rapidly and accurately determining the concentration of lithium salt in the electrolyte of a lithium ion battery.
SUMMERY OF THE UTILITY MODEL
Based on the technical problem who exists among the background art, the utility model provides a lithium ion electrolyte lithium salt concentration detection device based on concentration cell.
The utility model provides a lithium ion electrolyte lithium salt concentration detection device based on concentration cell, which comprises two sealed aluminum-plastic bags, two lithium electrodes and a voltage detector; the two sealed aluminum-plastic bags are filled with electrolytes with different concentrations, communicated through a capillary tube, and provided with a valve; the two lithium electrodes are respectively inserted into the electrolyte of the two sealed aluminum-plastic bags, the two lithium electrodes are respectively connected with nickel tabs, and the two nickel tabs are connected with a voltage detector through a wire.
Preferably, the lithium electrode uses a copper-lithium composite tape.
Preferably, the capillary has an inner diameter of 0.85 to 1.25 mm.
Preferably, the capillary has an outer diameter of 2.3 to 2.8 mm.
Preferably, the volumes of the electrolyte in the two sealed aluminum-plastic bags are the same.
The utility model provides a lithium ion electrolyte lithium salt concentration detection device based on concentration cell adopts the plastic-aluminum bag to seal, has guaranteed the leakproofness of whole testing arrangement, switches on two sealed plastic-aluminum bags through the capillary of taking the valve, has formed ion channel promptly, avoids electrolyte intermixing in two sealed plastic-aluminum bags again, has guaranteed the accuracy of experiment; the utility model discloses simple, with low costs, easy to operate, and do not use any chemical reagent in the testing process, can be fast, accurate record lithium ion electrolyte concentration.
Drawings
Fig. 1 is the utility model provides a lithium ion electrolyte lithium salt concentration detection device's schematic structure based on concentration cell.
Detailed Description
Referring to fig. 1, the utility model provides a lithium ion electrolyte lithium salt concentration detection device based on concentration cell, which comprises two sealed aluminum-plastic bags 1, two lithium electrodes 2 and a voltage detector 3; wherein:
electrolyte with different concentrations and the same volume is injected into the two sealed aluminum-plastic bags 1, the two sealed aluminum-plastic bags 1 are communicated through a capillary tube 4, and a valve 5 is arranged on the capillary tube 4.
The two lithium electrodes 2 are respectively inserted into the electrolyte of the two sealed aluminum-plastic bags 1, the two lithium electrodes 2 are respectively connected with nickel tabs 6, and the two nickel tabs 6 are connected with the voltage detector 3 through wires.
The utility model discloses when the preparation, at first add the copper wire in capillary 4, then encapsulate the one end of an aluminium-plastic bag 1 with the heat-sealing machine, take out the copper wire in capillary 4 after the encapsulation temperature cooling, capillary 4's the other end adopts the same method encapsulation with another aluminium-plastic bag 1. After three sides of the aluminum-plastic bag 1 are sealed, the two aluminum-plastic bags 1 are filled with electrolytes with the same volume and different concentrations, the last side of the aluminum-plastic bag 1 is sealed, and the valve 5 is closed.
In this embodiment, in order to facilitate welding of the lithium electrode and the nickel electrode tab, the lithium electrode 2 is a copper-lithium composite tape.
In this embodiment, in order to ensure that the capillary 4 is sealed with the aluminum-plastic bag 1 and the two aluminum-plastic bags 1 are communicated with each other, and to avoid mixing of the electrolytes in the two aluminum-plastic bags 1, the capillary 4 is made of a PP tube, the inner diameter of the capillary 4 is 1mm, and the outer diameter of the capillary 4 is 2.5 mm.
Further, in order to avoid the sealing of the capillary 4 and the aluminum-plastic bag 1 during the packaging, before the capillary 4 and one end of the aluminum-plastic bag 1 are packaged by a heat sealing machine, a copper wire with the diameter being as much as the inner diameter of the capillary 4 needs to be added into the capillary 4; after encapsulation, the copper wire is pulled out.
Further, in order to ensure that an ion channel is formed between the two aluminum-plastic bags 1 in the test process, and the electrolytes in the two aluminum-plastic bags 1 are not mixed with each other, the two aluminum-plastic bags 1 have the same size, and the volumes of the electrolytes in the aluminum-plastic bags 1 are the same.
The utility model discloses when detecting, guarantee electrolyte lithium salt concentration c in one of them plastic-aluminum bag 1 1 The concentration of lithium salt in the electrolyte in the other aluminum-plastic bag 1 is not changed, and the concentration is c 2 Opening a valve 5 on the capillary tube 4 to fill the capillary tube 4 with electrolyte, connecting a voltage detector 3 to a lithium electrode 2 welded to a nickel tab 6, wherein the voltage indication is U, and connecting c 1 Without change, c is 2 The concentration is changed into 5 concentrations, five voltages are obtained, and dU/dInc can be obtained according to the formula (1):
wherein U is the potential of the concentration cell, f ± Is the average molar activity coefficient, c is the concentration, t + Is the ion transport number, R is the gas constant, T is the temperature, and F is the Faraday constant. The concentration of lithium salt in the unknown electrolyte can be calculated by equation (2):
the formula (3) can be obtained by combining the formula (1) and the formula (2):
the concentration c of lithium salt in the electrolyte in one aluminum plastic bag 1 1 Adding unknown electrolyte c with the same volume into another aluminum-plastic bag 1 without changing Is unknown And measuring the voltage Ucc between the two electrodes, and substituting the voltage Ucc into the formula (3) to obtain the unknown lithium salt concentration of the electrolyte.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A lithium ion electrolyte lithium salt concentration detection device based on a concentration difference battery is characterized by comprising two sealed aluminum-plastic bags (1), two lithium electrodes (2) and a voltage detector (3); electrolyte with different concentrations is injected into the two sealed aluminum-plastic bags (1), the two sealed aluminum-plastic bags (1) are communicated through a capillary tube (4), and a valve (5) is arranged on the capillary tube (4); the two lithium electrodes (2) are respectively inserted into the electrolyte of the two sealed aluminum-plastic bags (1), the two lithium electrodes (2) are respectively connected with a nickel lug (6), and the two nickel lugs (6) are connected with the voltage detector (3) through wires.
2. The concentration detection device of lithium ion electrolyte lithium salt based on concentration difference battery as claimed in claim 1, wherein the lithium electrode (2) adopts copper lithium composite belt.
3. The concentration detection device of lithium ion electrolyte lithium salt based on concentration difference battery as claimed in claim 1 or 2, characterized in that the inner diameter of the capillary tube (4) is 0.85-1.25 mm.
4. The concentration detection device of lithium ion electrolyte lithium salt based on concentration difference battery as claimed in claim 1 or 2, characterized in that the outer diameter of the capillary tube (4) is 2.3-2.8 mm.
5. The concentration detection device of lithium ion electrolyte based on concentration difference battery as claimed in claim 1 or 2, wherein the volumes of the electrolytes in the two sealed aluminum plastic bags (1) are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122980384.6U CN217385318U (en) | 2021-11-30 | 2021-11-30 | Lithium ion electrolyte lithium salt concentration detection device based on concentration cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122980384.6U CN217385318U (en) | 2021-11-30 | 2021-11-30 | Lithium ion electrolyte lithium salt concentration detection device based on concentration cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217385318U true CN217385318U (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122980384.6U Active CN217385318U (en) | 2021-11-30 | 2021-11-30 | Lithium ion electrolyte lithium salt concentration detection device based on concentration cell |
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| Country | Link |
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| CN (1) | CN217385318U (en) |
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2021
- 2021-11-30 CN CN202122980384.6U patent/CN217385318U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230706 Address after: No. 566, Huayuan Avenue, Baohe District, Hefei City, Anhui Province, 230000 Patentee after: Anhui Guoxuan New Energy Vehicle Technology Co.,Ltd. Address before: 230000 no.599 Daihe Road, Xinzhan District, Hefei City, Anhui Province Patentee before: Gotion High-tech Co., Ltd. |