CN114656918A - Insulating glue solution for coating blank edge of lithium ion battery positive plate and preparation method - Google Patents
Insulating glue solution for coating blank edge of lithium ion battery positive plate and preparation method Download PDFInfo
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- CN114656918A CN114656918A CN202210422016.6A CN202210422016A CN114656918A CN 114656918 A CN114656918 A CN 114656918A CN 202210422016 A CN202210422016 A CN 202210422016A CN 114656918 A CN114656918 A CN 114656918A
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- glue solution
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- insulating glue
- lithium ion
- ion battery
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- 239000003292 glue Substances 0.000 title claims abstract description 81
- 239000011248 coating agent Substances 0.000 title claims abstract description 35
- 238000000576 coating method Methods 0.000 title claims abstract description 35
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims description 9
- 239000004642 Polyimide Substances 0.000 claims abstract description 35
- 229920001721 polyimide Polymers 0.000 claims abstract description 35
- 239000011230 binding agent Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000000654 additive Substances 0.000 claims abstract description 24
- 230000000996 additive effect Effects 0.000 claims abstract description 24
- 239000000049 pigment Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000006229 carbon black Substances 0.000 claims abstract description 7
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 40
- 239000007787 solid Substances 0.000 claims description 25
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 19
- 239000002033 PVDF binder Substances 0.000 claims description 15
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims 2
- 239000011888 foil Substances 0.000 abstract description 8
- 239000002923 metal particle Substances 0.000 abstract description 7
- 238000005452 bending Methods 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 description 13
- 238000003698 laser cutting Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000012795 verification Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 210000004128 D cell Anatomy 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
- C09J179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09J179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses an insulating glue solution for coating the edge of a lithium ion battery positive plate with a white margin, which comprises the components of polyimide powder, a binder, a solvent and a pigment additive; the polyimide powder has the following structure:
wherein the A group comprises-COOH, -OH or-CHO and the B group comprises-CH3、‑C2H5、‑C4H7 or-C5H9(ii) a The pigment additive is an insulating carbon black material. The invention also discloses a method for preparing the insulating glue solution. The polyimide substances in the insulating glue solution have the performances of high temperature resistance and difficult decomposition, so that the foil can be prevented from being directly cut by laser, the splashing of metal particles can be effectively resisted, and meanwhile, the pigment additive in the insulating glue solution is an insulating carbon black material, so that the problem of the splashing of the metal particles caused by the fact that the foil is directly cut by the laser can be effectively solved; the coating formed by the insulating glue solution can isolate the root of the tab, which is caused by bending the tab when the battery cell enters the shell, from effectively contacting the edge of the pole piece, so that the problem of short circuit between the tab and the material area is avoided.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an insulating glue solution for coating the edge of a lithium ion battery positive plate with a blank and a preparation method thereof.
Background
The lithium battery as a new energy battery has the advantages of high working voltage, high specific capacity, long charging and discharging life, no memory effect and the like. Lithium batteries are gradually the mainstream energy source of choice, so the demand for lithium batteries is higher and higher; meanwhile, the safety of the lithium battery is more and more a focus of attention of people, abnormal battery cores such as 0 resistance value of short circuit test, low formation voltage, large self-discharge, large module pressure difference and the like can be assembled in the daily manufacturing process of the lithium battery, wherein the points of breakdown of the diaphragm corresponding to the margin left on the edge of the positive plate of the battery core can be found when the finished battery is disassembled, and the analysis reason is that metal particles are sputtered at the margin position in the laser cutting process to cause foreign matter to break down the diaphragm corresponding to the margin left, so that the voltage difference of the battery core is large, and the short circuit can be caused seriously to cause serious accidents; and when the battery core is inserted into the shell, the tab is bent to cause the contact of the root part of the tab and the edge of the pole piece, and the short circuit can be caused.
Most of the existing square lithium battery manufacturing processes adopt coating and blank leaving, and winding is carried out after cutting tabs by laser, for example, patent CN104051705A discloses a high-efficiency multi-tab winding type battery sheet-making device. In the traditional laser cutting, in order to reduce dust, a foil material is directly cut, a foil material blank area of 0.5-1mm is reserved at the edge of the material area, and metal particles are sputtered at the blank position in the direct cutting process, so that the introduction of an edge coating capable of insulating becomes an important safety measure.
Disclosure of Invention
The invention aims to solve the technical problem of how to solve the problem of short circuit caused by edge blank of the traditional lithium battery positive plate.
The invention solves the technical problems through the following technical means:
an insulating glue solution for coating the edge of a lithium ion battery positive plate with a white margin comprises components of polyimide powder, a binder, a solvent and a pigment additive; the polyimide powder has the following structure:
wherein the A group comprises-COOH, -OH or-CHO and the B group comprises-CH3、-C2H5、-C4H7or-C5H9。
According to the insulating glue solution coated on the margin edge of the lithium ion battery positive plate, the possibility of short circuit can be reduced, on one hand, the polyimide substances in the insulating glue solution have the performances of high temperature resistance and difficulty in decomposition, the foil can be prevented from being directly cut by laser, and the splashing of metal particles can be effectively resisted; moreover, the laser cuts in the insulating glue solution, so that metal bead particles are not easy to generate, and the problem of metal particle splashing caused by the fact that the foil is directly cut by the laser is effectively solved; on the other hand, the coating formed by the insulating glue solution can isolate the root of the tab, which is caused by bending the tab when the battery cell enters the shell, from effectively contacting the edge of the pole piece, so that the problem of short circuit between the tab and the material area is avoided.
Preferably, the molecular weight of the polyimide powder is 50-150 ten thousand.
Preferably, the mass ratio of the polyimide powder, the binder and the pigment additive is 90-95: 6-10: 0.9-1.2.
Preferably, the pigment additive is an insulating carbon black material.
The pigment additive in the insulating glue solution is an insulating carbon black material, the insulating carbon black material can effectively absorb laser energy, and the laser setting power or energy can be further reduced during actual laser cutting, so that the energy consumption is saved, and the cutting requirement is met.
Preferably, the solid content of the insulating glue solution is 5-8%.
Preferably, the solvent is N-methylpyrrolidone (NMP).
Preferably, the binder is polyvinylidene fluoride (PVDF).
The invention also provides a method for preparing the lithium ion battery negative plate, which comprises the following steps:
(1) dissolving all the binder in the solvent at one time to obtain a binder solution;
(2) mixing the binder solution with the polyimide powder, stirring and adjusting the solid content to obtain a mixed glue solution;
(3) adding pigment additive into the mixed glue solution, and stirring to obtain the final glue solution.
Further, the solid content of the binder glue solution in the step (1) is 1-8%.
Further, the solid content of the mixed glue solution in the step (2) is controlled to be 6-10%, and the solid content of the mixed glue solution is adjusted by adding a solvent.
Further, the stirring parameters in the step (1) are set as follows: the stirring time is 15-40min, the revolution speed is 12rpm, and the rotation speed is 600-900 rpm.
Further, the stirring parameters in the step (2) are set as follows: the stirring time is 30-60min, the revolution speed is 12rpm, and the rotation speed is 800-1200 rpm.
Further, the stirring parameters in the step (3) are set as follows: the stirring time is 20-40min, the revolution speed is 12rpm, and the rotation speed is 600-900 rpm.
The invention has the following beneficial effects:
1. the insulating glue solution coated on the blank edge of the lithium ion battery positive plate can reduce the possibility of short circuit, on one hand, polyimide substances in the insulating glue solution have the performances of high temperature resistance and difficult decomposition, can prevent foil from being directly cut by laser, and can effectively resist metal particles from splashing, and on the other hand, a coating formed by the insulating glue solution can isolate the root of a tab from the edge of the positive plate caused by bending the tab when a battery cell enters a shell, so that the problem of short circuit between the tab and a material area is avoided.
2. The insulating carbon black material can effectively absorb laser energy, laser setting power (energy) can be further reduced during actual laser cutting, energy consumption is saved, and cutting requirements are met.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below through the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
Example 1
The insulating glue solution for coating the edge of the left white part of the positive plate of the lithium ion battery is characterized by comprising polyimide powder, a binder, a solvent and a pigment additive, wherein the polyimide powder has a structure shown in a formula (1):
wherein A is-COOH and B is-C5H9The molecular weight of the polyimide powder is 120 ten thousand.
Wherein the mass ratio of the polyimide powder, the binder and the pigment additive is 93.1: 6.0: 0.9, polyvinylidene fluoride (PVDF) serving as a binder, N-methyl pyrrolidone (NMP) serving as a solvent, a conductive carbon black material serving as a pigment additive, and 6.5% of solid content of glue solution;
the preparation method of the insulating glue solution of the lithium ion battery comprises the following steps:
(1) dissolving polyvinylidene fluoride in N-methyl pyrrolidone completely at one time, and stirring for 20min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, and the binder solution with the solid content of 2 percent is obtained;
(2) mixing the binder solution with the polyimide powder, and stirring for 50min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 1200rpm, and mixed glue solution with the solid content of 10 percent is obtained;
(3) finally, adding conductive carbon black into the mixed glue solution, and stirring for 30min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, NMP is added to adjust the solid content to 6.5 percent, and the finished product of the insulating glue solution can be obtained;
coating the prepared finished product insulating glue solution on the margin of the edge of the lithium ion battery positive plate, wherein the coating glue width is 3.5-4mm, the double-sided glue coating thickness is 15-20 mu m, and the laser cutting parameter is adjusted to be optimal; verification item: the results of whether the cells in the disassembled batch A have the situation that the edge margin of the positive plate is broken down or not when the cells are assembled into the cells with the resistance value of 0, the formation voltage is low and the module pressure difference is large are shown in tables 1 and 2.
Comparative example 1
The comparative example differs from example 1 in that: the edges of the positive plates of the adjacent batches B are not coated with glue; verification item: and (3) assembling 0 resistance value, low formation voltage and large module pressure difference of the battery cores in the disassembled batch B to determine whether the battery cores have the condition that the edges of the positive plates are left blank and broken down, and the results are shown in tables 1 and 2.
Example 2
The insulating glue solution for coating the edge of the left white part of the positive plate of the lithium ion battery is characterized by comprising polyimide powder, a binder, a solvent and a pigment additive, wherein the polyimide powder has a structure shown in a formula (1):
wherein the A group is-CHO and the B group is-C2H5The molecular weight of the polyimide powder is 75 ten thousand.
Wherein the mass ratio of the polyimide powder, the binder and the pigment additive is 92.5: 6.5: 1.0, polyvinylidene fluoride (PVDF) serving as a binder, N-methyl pyrrolidone (NMP) serving as a solvent, a conductive carbon black material serving as a pigment additive, and 8.0% of solid content of glue solution;
the preparation method of the insulating glue solution of the lithium ion battery comprises the following steps:
(1) dissolving polyvinylidene fluoride in N-methyl pyrrolidone completely at one time, and stirring for 20min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, and an adhesive solution with the solid content of 3 percent is obtained;
(2) mixing the binder solution with the polyimide powder, and stirring for 50min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 1200rpm, and mixed glue solution with the solid content of 12 percent is obtained;
(3) and finally, adding conductive carbon black into the mixed glue solution, and stirring for 30min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, NMP is added to adjust the solid content to 8.0 percent, and the finished product of the insulating glue solution can be obtained;
coating the prepared finished product insulating glue solution on the edge margin of the lithium ion battery positive plate, wherein the coating glue width is 3.5-4mm, the double-sided glue coating thickness is 15-20 mu m, and the laser cutting parameter is adjusted to be optimal; verification item: and (3) assembling 0 resistance value, low formation voltage and large module pressure difference of the cells in the disassembled batch of the cells C, and judging whether the edge margins of the positive plates are broken down or not, wherein the results are shown in tables 1 and 2.
Comparative example 2
The comparative example differs from example 2 in that: the edges of the positive plates of the adjacent batches D are not coated with glue; verification item: whether the cells with 0 resistance value, low formation voltage and large module pressure difference are broken down when the edges of the positive plates are left blank or not is disassembled in batch D cell assembly, and the results are shown in tables 1 and 2.
Example 3
An insulating glue solution for coating the edge of the left white of a positive plate of a lithium ion battery comprises polyimide powder, a binder, a solvent and a pigment additive, wherein the polyimide powder has a structure shown in a formula (1):
wherein A is-COOH and B is-C5H9The molecular weight of the polyimide powder is 120 ten thousand.
Wherein the mass ratio of the polyimide powder, the binder and the pigment additive is 95.0: 4.0: 1.0, polyvinylidene fluoride (PVDF) serving as a binder, N-methyl pyrrolidone (NMP) serving as a solvent, a conductive carbon black material serving as a pigment additive and 5.0% of solid content of glue solution;
the preparation method of the insulating glue solution of the lithium ion battery comprises the following steps:
(1) dissolving polyvinylidene fluoride in N-methyl pyrrolidone completely at one time, and stirring for 20min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, and the binder solution with the solid content of 2 percent is obtained;
(2) mixing the binder solution with the polyimide powder, and stirring for 50min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 1200rpm, and mixed glue solution with the solid content of 10 percent is obtained;
(3) finally, adding conductive carbon black into the mixed glue solution, and stirring for 30min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, NMP is added to adjust the solid content to 5.0 percent, and then the finished product of insulating glue solution can be obtained;
coating the prepared finished product insulating glue solution on the edge margin of the lithium ion battery positive plate, wherein the coating glue width is 3.5-4mm, the double-sided glue coating thickness is 15-20 mu m, and the laser cutting parameter is adjusted to be optimal; verification item: and (3) assembling 0 resistance value, low formation voltage and large module pressure difference electric cores in the disassembled batch of the electric cores, and judging whether the edge margins of the positive plates are broken down or not, wherein the results are shown in tables 1 and 2.
Comparative example 3
This comparative example differs from example 3 in that: the edges of the positive plates of the adjacent batches F are not coated with glue; and (4) verification item: whether the cells with 0 resistance value, low formation voltage and large module pressure difference are broken down when the battery cells are assembled in batches of F cells is disassembled, and the results are shown in tables 1 and 2.
Example 4
The insulating glue solution for coating the edge of the left white part of the positive plate of the lithium ion battery is characterized by comprising polyimide powder, a binder, a solvent and a pigment additive, wherein the polyimide powder has a structure shown in a formula (1):
in the formula, the A group is-CHO, the B group is-C2H5The molecular weight of the polyimide powder is 75 ten thousand.
Wherein the mass ratio of the polyimide powder, the binder and the pigment additive is 97.5: 2.0: 0.5, polyvinylidene fluoride (PVDF) serving as a binder, N-methyl pyrrolidone (NMP) serving as a solvent, a conductive carbon black material serving as a pigment additive, and 6.0% of solid content of glue solution;
the preparation method of the insulating glue solution of the lithium ion battery comprises the following steps:
(1) dissolving polyvinylidene fluoride in N-methyl pyrrolidone completely at one time, and stirring for 20min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, and the binder solution with the solid content of 3 percent is obtained;
(2) mixing the binder solution with the polyimide powder, and stirring for 50min, wherein the stirring parameters are as follows: the revolution speed is 12rpm, the rotation speed is 1200rpm, and mixed glue solution with the solid content of 12 percent is obtained;
(3) finally, adding conductive carbon black into the mixed glue solution, and stirring for 30min with the stirring parameters as follows: the revolution speed is 12rpm, the rotation speed is 800rpm, NMP is added to adjust the solid content to 6.0 percent, and the finished product of the insulating glue solution can be obtained;
coating the prepared finished product insulating glue solution on the edge margin of the lithium ion battery positive plate, wherein the coating glue width is 3.5-4mm, the double-sided glue coating thickness is 15-20 mu m, and the laser cutting parameter is adjusted to be optimal; verification item: and (3) assembling 0 resistance value, low formation voltage and large module pressure difference electric cores in the disassembled batch of G electric cores, and judging whether the edge margins of the positive plates are broken down or not, wherein the results are shown in tables 1 and 2.
Comparative example 4
This comparative example differs from example 4 in that: the edges of the adjacent batches of the H positive plates are not coated with glue; verification item: whether the cells with 0 resistance value, low formation voltage and large module pressure difference are broken down when the edges of the positive plates are left blank or not is disassembled in batch H cell assembly, and the results are shown in tables 1 and 2.
Table 1 validation of the effect of the rubberized pole pieces of the examples and comparative examples after laser cutting
As can be seen from the verification of Table 1, after the glued pole piece is cut by laser, the residual glue coating area of 0.5-1mm at the edge of the blank area has good insulation, the resistance value tested by a short circuit tester is more than 2000 MOmega, and the area of 0.5-1mm at the edge of the blank area of the pole piece without glue coating is foil and has no insulation.
TABLE 2 laser cutting effect of the rubberized pole pieces of the examples and comparative examples
As can be seen from the verification conditions in Table 2, the laser cutting effect difference between the glued pole pieces in adjacent batches and the pole pieces which are not glued is large, and the visual performance is that the glued pole pieces do not have abnormal electric cores caused by the situation that the diaphragm of the margin area of the edge of the positive pole piece is broken down or the root of the pole lug is short-circuited in the subsequent process.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an insulating glue solution that is used for lithium ion battery positive plate to leave white edge coating which characterized in that: the insulating glue solution comprises polyimide powder, a binder, a solvent and a pigment additive; the polyimide powder has the following structure:
wherein the A group comprises-COOH, -OH or-CHO and the B group comprises-CH3、-C2H5、-C4H7or-C5H9。
2. The insulating glue solution for the edge coating of the lithium ion battery positive plate with the white left part according to claim 1, is characterized in that: the molecular weight of the polyimide powder is 50-150 ten thousand.
3. The insulating glue solution for the edge coating of the lithium ion battery positive plate with the white left part according to claim 2, is characterized in that: the mass ratio of the polyimide powder, the binder and the pigment additive is 90-95: 6-10: 0.9-1.2.
4. The insulating glue solution for the edge coating of the lithium ion battery positive plate with the white left part according to claim 1, is characterized in that: the pigment additive is an insulating carbon black material.
5. The insulating glue solution for the edge coating of the lithium ion battery positive plate with the white left part according to claim 1, is characterized in that: the solid content of the insulating glue solution is 5-8%.
6. The insulating glue solution for the edge coating of the lithium ion battery positive plate with the white left part according to claim 1, is characterized in that: the solvent is N-methyl pyrrolidone.
7. The insulating glue solution for the edge coating of the lithium ion battery positive plate with the white left part according to claim 1, is characterized in that: the binder is polyvinylidene fluoride.
8. Process for the preparation of an insulating cement according to claim 1, characterized in that it comprises the following steps:
(1) dissolving all the binder in the solvent at one time to obtain a binder solution;
(2) mixing the binder solution with the polyimide powder, stirring and adjusting the solid content to obtain a mixed glue solution;
(3) adding pigment additive into the mixed glue solution, and stirring to obtain the final glue solution.
9. The process for preparing an insulating cement solution according to claim 8, wherein: the solid content of the adhesive glue solution in the step (1) is 1-8%; the solid content of the mixed glue solution in the step (2) is 6-10%.
10. A process for the preparation of an insulating glue solution according to any one of claims 8 to 9, characterized in that: the stirring parameters in the step (1) are set as follows: the stirring time is 15-40min, the revolution speed is 12rpm, and the rotation speed is 600-900 rpm; the stirring parameters in the step (2) are set as follows: the stirring time is 30-60min, the revolution speed is 12rpm, and the rotation speed is 800-1200 rpm; the stirring parameters in the step (3) are set as follows: the stirring time is 20-40min, the revolution speed is 12rpm, and the rotation speed is 600-900 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210422016.6A CN114656918A (en) | 2022-04-21 | 2022-04-21 | Insulating glue solution for coating blank edge of lithium ion battery positive plate and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210422016.6A CN114656918A (en) | 2022-04-21 | 2022-04-21 | Insulating glue solution for coating blank edge of lithium ion battery positive plate and preparation method |
Publications (1)
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| CN1783357A (en) * | 2004-11-30 | 2006-06-07 | 财团法人工业技术研究院 | Modified mesoporous silicon dioxide powder, presolution for forming low dielectric opoxy resin and low dielectric polysub amido resin, low dielectric constant base board and its forming method |
| CN103936989A (en) * | 2013-01-21 | 2014-07-23 | 达兴材料股份有限公司 | Polyimide structure and polyimide resin composition |
| CN105307405A (en) * | 2014-05-29 | 2016-02-03 | 景硕科技股份有限公司 | Method for fabricating circuit board etched by polyimide |
| CN109749681A (en) * | 2017-11-06 | 2019-05-14 | 危华 | A kind of insulative glue for lithium ion battery |
| CN111384461A (en) * | 2018-12-29 | 2020-07-07 | 中信国安盟固利动力科技有限公司 | Multi-parameter integrated device of ion battery and preparation method thereof |
| WO2022000423A1 (en) * | 2020-07-02 | 2022-01-06 | 宁德新能源科技有限公司 | Battery and electronic apparatus |
| WO2022075486A1 (en) * | 2020-10-10 | 2022-04-14 | Prism BioLab Co., Ltd. | Novel bicyclic compounds |
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| CN1783357A (en) * | 2004-11-30 | 2006-06-07 | 财团法人工业技术研究院 | Modified mesoporous silicon dioxide powder, presolution for forming low dielectric opoxy resin and low dielectric polysub amido resin, low dielectric constant base board and its forming method |
| CN103936989A (en) * | 2013-01-21 | 2014-07-23 | 达兴材料股份有限公司 | Polyimide structure and polyimide resin composition |
| CN105307405A (en) * | 2014-05-29 | 2016-02-03 | 景硕科技股份有限公司 | Method for fabricating circuit board etched by polyimide |
| CN109749681A (en) * | 2017-11-06 | 2019-05-14 | 危华 | A kind of insulative glue for lithium ion battery |
| CN111384461A (en) * | 2018-12-29 | 2020-07-07 | 中信国安盟固利动力科技有限公司 | Multi-parameter integrated device of ion battery and preparation method thereof |
| WO2022000423A1 (en) * | 2020-07-02 | 2022-01-06 | 宁德新能源科技有限公司 | Battery and electronic apparatus |
| WO2022075486A1 (en) * | 2020-10-10 | 2022-04-14 | Prism BioLab Co., Ltd. | Novel bicyclic compounds |
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