CN109959823B - High-precision lithium ion battery negative pole piece lithium embedding impedance measurement clamp and method - Google Patents
High-precision lithium ion battery negative pole piece lithium embedding impedance measurement clamp and method Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 67
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002847 impedance measurement Methods 0.000 title abstract description 8
- 238000003780 insertion Methods 0.000 claims abstract description 7
- 230000037431 insertion Effects 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 12
- 239000003792 electrolyte Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000012216 screening Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 abstract 1
- -1 polypropylene Polymers 0.000 description 5
- 238000012827 research and development Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a high-precision lithium ion battery negative pole piece lithium insertion impedance measuring clamp and a method, wherein the high-precision lithium ion battery negative pole piece lithium insertion impedance measuring clamp comprises a sealed cabin device, a lithium piece interface leveling and fixing device, a pole spacing adjusting device and a pole piece fixing device to be measured; the sealed cabin device is used for ensuring that the measuring environment is in a water-free and oxygen-free environment; the lithium sheet interface flattening and fixing device is used for installing a lithium sheet reference electrode, the surface of the lithium sheet is flattened through the upper-section flattening threads, the consistency of the inter-electrode distance is ensured, and the lithium sheet is ensured to be in good contact with the electrode fixing device by adopting large pressure while the surface is flattened; the inter-polar distance adjusting device adjusts the interface distance between the reference electrode and the electrode to be detected according to the interface flatness of the electrode to be detected, and ensures that the inter-polar distances among different groups are kept consistent; the fixing device for the pole piece to be tested adopts micropore negative pressure to fix the pole piece to be tested, and ensures that the current collector of the pole piece is in good contact with the lead. The high-precision impedance measurement method for the negative pole piece of the lithium battery can quickly evaluate the impedance of the negative pole formula among different groups, can obviously reduce the group screening time and the evaluation cost, improves the economic benefit of enterprises, is beneficial to being widely applied in production, and has great production practice significance.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a high-precision lithium ion battery negative pole piece lithium embedding impedance measurement clamp and method.
Background
Through the development of more than twenty years, the lithium ion battery has rich industrial chains and diversified development trends of battery models, the battery performance can meet the requirements of multiple industries on power supplies, and the lithium ion battery is widely applied to the fields of electric vehicle power supplies, communication base station power supplies, communication tools, electric tools and the like at present. The impedance of the lithium ion battery is mainly caused by the lithium embedding impedance of the pole pieces, so how to accurately and quickly evaluate the lithium embedding impedance of different pole pieces has important practical significance and commercial value for optimizing the impedance of the lithium battery.
The existing method for testing the impedance of the pole piece mainly adopts a lithium piece as a reference electrode, a positive pole piece and a negative pole piece to be tested as a counter electrode, a separation film and electrolyte are arranged between the two electrodes to assemble the button cell, and then the impedance of the button cell is tested to indirectly obtain the lithium-embedded impedance of the pole piece. The method has certain discrimination capability when testing the positive pole piece with higher impedance, and when testing the negative pole piece with lower impedance, the impedance of the negative pole pieces in different groups cannot be effectively distinguished due to the fact that the impedance of the reference electrode is close to that of the negative pole, the performance optimization efficiency of the battery is seriously influenced, and the uncontrollable property of the preparation process is increased. The measuring clamp and the method can adopt the same lithium sheet as a reference electrode, remove the isolation membrane component, eliminate the influence on the impedance measurement caused by electrode and interface factors, obviously improve the impedance measurement precision of the negative pole piece of the lithium battery and improve the impedance discrimination of different groups of pole pieces. The screening cost of the low-impedance pole piece can be obviously reduced, the controllability level of technological process parameters is improved, the research and development and manufacturing cost of enterprises is effectively reduced, the economic benefit of the enterprises is improved, and the market competitiveness of products is improved.
Disclosure of Invention
In view of the above, the present invention aims to provide a high-precision lithium ion battery negative electrode sheet lithium insertion impedance measurement clamp and method, so as to solve the technical problems that the measurement is not accurate and the influence of the isolation film cannot be eliminated due to the fluctuation of the reference electrode between different groups at present.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a high-precision lithium ion battery negative pole piece lithium embedding impedance measuring clamp comprises a sealed cabin device, a lithium piece interface leveling and fixing device, a pole spacing adjusting device and a pole piece fixing device to be measured;
the sealed cabin device is used for ensuring that the measuring environment is in an anhydrous and oxygen-free environment, ensuring that the electrolyte is in perfect contact with the interface of the pole piece, and improving the testing accuracy and consistency;
the lithium sheet interface flattening and fixing device is used for installing a lithium sheet reference electrode, the surface of the lithium sheet is flattened through the upper-section flattening threads, the consistency of the inter-electrode distance is ensured, and the lithium sheet is ensured to be in good contact with the electrode fixing device by adopting large pressure while the surface is flattened; the same reference electrode is adopted among different groups, so that the test precision and accuracy are improved.
The inter-polar distance adjusting device adjusts the interface distance between the reference electrode and the electrode to be detected according to the interface flatness of the electrode to be detected, and ensures that the inter-polar distances among different groups are kept consistent;
the fixing device for the pole piece to be tested adopts micropore negative pressure to fix the pole piece to be tested, ensures that the current collector of the pole piece is in good contact with the lead, and ensures the contact consistency among different groups.
Furthermore, the sealed cabin device is a stainless steel sealer with the interior coated with polypropylene, the thickness of the polypropylene coating is 3-5mm, the left side and the right side of the sealer are provided with hollow lead connectors, the left connector is connected with a negative electrode clamp of the electrochemical impedance instrument, and the right connector is connected with a positive electrode clamp of the electrochemical impedance instrument.
Furthermore, the lithium sheet interface flattening and fixing device is used for installing a lithium sheet reference electrode, the upper section of the flattening thread is used for flattening the surface of the lithium sheet to ensure that the distance between the electrodes is kept consistent, and large pressure is adopted to ensure that the lithium sheet is in good contact with the electrode fixing device while the surface is flattened.
Furthermore, the inter-polar distance adjusting device adjusts the interface distance between the reference electrode and the electrode to be measured according to the interface flatness of the electrode to be measured, so as to ensure that the inter-polar distances between different groups are kept consistent.
Furthermore, the device also comprises a fixing device for the pole piece to be tested, wherein the fixing device for the pole piece to be tested adopts micropore negative pressure to fix the pole piece to be tested, so that the current collector of the pole piece is ensured to be in good contact with the lead.
A method for measuring lithium embedding impedance of a negative pole piece of a high-precision lithium ion battery comprises the following steps:
s1, the lithium sheet reference electrode, the electrolyte and the electrode to be detected are in an anhydrous and oxygen-free state through a sealed cabin device;
s2, the same reference electrode is adopted and used for measuring the impedance of the pole piece to be measured for multiple times, and the influence of different reference electrodes on the test result is eliminated;
s3, adjusting the distance between the two electrodes by adopting a polar distance adjusting device to ensure that the interface distances between different groups are the same;
s4, fixing the pole piece to be measured through micropore negative pressure, and ensuring the tight contact between the pole piece and the spacing adjusting device by adopting thread pressure.
Further, in the step S2, the thickness of the lithium sheet is 2-3mm, the diameter is 25mm, the contact resistance between the lithium sheet and the fixing groove is less than or equal to 5m Ω, and each reference electrode tests the impedance of 5 groups of negative electrode sheets.
Further, in step S3, the inter-electrode distance adjusting device is made of teflon insulation material, and the inter-electrode distance adjusting range is 10 μm to 20 μm.
Further, in the step S4, the device for fixing the pole piece to be tested is fixed by the micropore negative pressure, the negative pressure is-0.1 kPa, and the contact resistance between the pole piece and the fixing groove is less than or equal to 15m Ω.
Compared with the prior art, the clamp and the method for measuring the lithium embedding impedance of the negative pole piece of the high-precision lithium ion battery have the following advantages:
(1) the invention relates to a high-precision lithium ion battery negative pole piece lithium embedding impedance measuring clamp and a method thereof, which adopt the same reference electrode to test the impedance of different negative pole pieces, eliminate the influence of an isolating membrane on impedance test, adopt an interval adjusting device to ensure that the polar intervals among different groups are kept the same, effectively eliminate the influence factor of impedance measurement, remarkably improve the accuracy and consistency of impedance test, facilitate screening out a negative pole piece scheme with smaller impedance, remarkably reduce the research and development and manufacturing cost of enterprises, improve the economic benefit of the enterprises, powerfully improve the market competitiveness of products, facilitate the wide application in production, and have great production practice significance.
(2) According to the high-precision measuring clamp and method for the lithium embedding impedance of the negative pole piece of the lithium ion battery, the interface flatness of the reference electrode lithium piece is guaranteed through the thread pressure, the contact resistance between the lithium piece and the electrode fixing device is reduced, the method can avoid the condition that the contact between the lithium piece of the button cell and a shell is poor, meanwhile, the measuring areas of the pole pieces to be measured of different groups can be guaranteed to be consistent, the measuring contrast and the distinguishing degree are effectively improved, the measuring precision is effectively improved, the research and development progress and the research and development investment are shortened, the economic benefits of enterprises are improved, and the market competitiveness of products is improved.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a measuring fixture for high-precision lithium-ion battery negative electrode sheet lithium-insertion impedance.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
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 by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in figure 1, the measuring clamp for the lithium embedding impedance of the negative pole piece of the high-precision lithium ion battery is characterized in that a reference electrode lithium piece is placed in a fixed area, then a thread pressure is adopted to level the interface of the lithium piece, the contact between the lithium piece and an electrode fixing device is enhanced, the contact resistance is reduced, then electrolyte is filled, and the assembly of the reference electrode is completed. The electrode to be tested is adsorbed on the fixing device in a vacuum mode, the inter-polar distance is adjusted, the distance between the electrode to be tested and the reference electrode is controlled to be about 15 mu m, then the impedance of the pole piece to be tested is measured, the structure of the reference electrode is kept unchanged after the measurement is finished, the electrode to be tested with the other component is replaced quickly, the impedance of the electrode is tested under the same test condition, a scheme with smaller impedance is obtained by comparing the impedance of different groups, the manufacturing cost of product development and performance analysis is reduced, the production benefit of an enterprise is improved, the market competitiveness of the product is improved effectively, the method is beneficial to being applied in production widely, and the method has great production practice significance.
The sealed cabin device is used for ensuring that the measuring environment is in a waterless and oxygen-free environment, the left side and the right side of the sealer are provided with hollow lead connectors, and the inner diameter of each lead is 3mm, so that gas in the cabin can be discharged under vacuum negative pressure.
The pressing lithium sheet interface leveling and fixing device comprises a lithium sheet fixing groove and a thread pressure interface leveling device.
The polar distance adjusting device is an annular polytetrafluoroethylene ring, and the thickness of the annular polytetrafluoroethylene ring is continuously adjustable between 10 and 20 mu m.
The device comprises a fixing device for the negative pole piece to be detected, wherein the fixing device is used for fixing the pole piece to be detected and ensuring the contact resistance between the pole piece and the fixing device.
A method for measuring the lithium embedding impedance of a negative pole piece of a high-precision lithium ion battery is characterized by comprising the following steps:
s1, the lithium sheet reference electrode, the electrolyte and the electrode to be detected are in an anhydrous and oxygen-free state through a sealed cabin device;
s2, measuring the impedance of the pole piece to be measured by using the same reference electrode for multiple times;
s3, adjusting the distance between the two electrodes by adopting a polar distance adjusting device to ensure that the interface distances between different groups are the same;
s4, fixing the pole piece to be measured through micropore negative pressure, and ensuring the tight contact between the pole piece and the spacing adjusting device by adopting thread pressure.
In the step S2, the thickness of the lithium sheet is 2-3mm, the diameter is 25mm, the contact resistance between the lithium sheet and the fixing groove is less than or equal to 5m omega, and the impedance of the negative electrode sheets with different components is measured by using the same lithium sheet reference electrode.
In step S3, the inter-electrode distance adjusting device is made of polytetrafluoroethylene insulation material, and the distance adjusting range is 10 μm to 20 μm.
Further, in the step S4, the device for fixing the pole piece to be tested is fixed by the micropore negative pressure, the negative pressure is-0.1 kPa, and the contact resistance between the pole piece and the fixing groove is less than or equal to 15m Ω.
The invention is not to be considered as limited to the details of the foregoing description, but is to be construed as broadly as the invention is capable of modification within the spirit and scope of the invention.
Claims (4)
1. The utility model provides a measurement anchor clamps of high accuracy lithium ion battery negative pole piece lithium impedance size that inlays which characterized in that: the device comprises a sealed cabin device, a lithium sheet interface leveling and fixing device, a pole spacing adjusting device and a pole piece fixing device to be tested;
the sealed cabin device is used for ensuring that a measuring environment is in a waterless and oxygen-free environment, ensuring that no bubbles exist in the interface of the electrolyte and the pole piece and in the electrolyte, and improving the accuracy and consistency of the test;
the lithium sheet interface flattening and fixing device is used for installing a lithium sheet reference electrode, the surface of the lithium sheet is flattened through the upper-section flattening threads, the consistency of the inter-electrode distance is ensured, and the lithium sheet is ensured to be in good contact with the electrode fixing device by adopting large pressure while the surface is flattened;
the inter-polar distance adjusting device adjusts the inter-polar distance between the lithium sheet reference electrode and the pole piece to be detected according to the interface flatness of the pole piece to be detected, and ensures that the inter-polar distance between the lithium sheet reference electrode and the pole piece to be detected is kept consistent;
the fixing device for the pole piece to be tested adopts micropore negative pressure to fix the pole piece to be tested, ensures that the current collector of the pole piece is in good contact with the lead, and ensures the contact consistency among different groups.
2. The high-precision lithium ion battery negative pole piece lithium insertion impedance measuring clamp according to claim 1 is characterized in that: the sealed cabin device is used for ensuring that the measuring environment is in the anhydrous and oxygen-free environment, the left side and the right side of the sealed cabin device are provided with hollow lead connectors, and the inner diameter of each lead is 3mm, so that gas in the cabin can be discharged under vacuum negative pressure.
3. The high-precision lithium ion battery negative pole piece lithium insertion impedance measuring clamp according to claim 1 is characterized in that: the lithium piece interface flattening and fixing device is used for installing a lithium piece reference electrode, good contact between the lithium piece and the electrode fixing device and the flatness of the lithium piece interface are ensured through compression of the pressure threads, the same lithium piece is adopted by different electrodes to be detected, and the same reference group adopted by the group is ensured.
4. The high-precision lithium ion battery negative pole piece lithium insertion impedance measuring clamp according to claim 3 is characterized in that: the inter-polar distance adjusting device adjusts the inter-polar distance between the lithium plate reference electrode and the pole piece to be measured by adopting a lifting method according to the interface flatness of the pole piece to be measured, and the consistency of the inter-polar distance is ensured.
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Effective date of registration: 20240322 Address after: Industrial Zone of Lutai Economic and Technological Development Zone, Tangshan City, Hebei Province Patentee after: TANGSHAN KIMWAN SPECIAL CARBON&GRAPHITE Co.,Ltd. Country or region after: China Address before: 300180 2nd floor, R & D building, No. 174, Jintang Road, Hedong District, Tianjin Patentee before: TIANJIN KIMWAN CARBON TECHNOLOGY AND DEVELOPMENT CO.,LTD. Country or region before: China |