CN110690506A - Lithium ion battery assembling method and lithium ion battery - Google Patents
Lithium ion battery assembling method and lithium ion battery Download PDFInfo
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- CN110690506A CN110690506A CN201910939211.4A CN201910939211A CN110690506A CN 110690506 A CN110690506 A CN 110690506A CN 201910939211 A CN201910939211 A CN 201910939211A CN 110690506 A CN110690506 A CN 110690506A
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- lithium ion
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- 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
- H01M10/058—Construction or manufacture
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- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery assembling method, which comprises the following operations: baking the positive plate, the negative plate and the diaphragm to obtain a baked positive plate, a baked negative plate and a baked diaphragm; laminating and/or winding the baked positive plate, the baked negative plate and the baked diaphragm; welding the lug to obtain a naked battery cell; placing the bare cell in an electrolyte for soaking to obtain a cell soaked by the electrolyte; putting the battery cell soaked by the electrolyte into a shell and packaging; and forming and packaging the packaged battery cell to obtain the lithium ion battery. According to the invention, the bare cell is directly soaked in the electrolyte, so that the battery pole piece and the diaphragm are fully soaked by the electrolyte, and then the liquid supplementing process is added according to the design weight, so that the electrical consistency among battery batches can be ensured; and the standing time after battery liquid injection can be shortened, and the production efficiency is improved. The lithium ion battery prepared by the method has high safety performance and good cycle performance.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery assembling method and a lithium ion battery.
Background
The lithium ion secondary battery, as an environment-friendly battery, has the advantages of high working voltage, high specific energy, long cycle life and the like, is rapidly developed in recent years, and is more and more widely applied to mobile equipment such as mobile phones, UPS power supplies, notebook computers, electric bicycles, electric automobiles and the like. The expansion of battery application fields and the increase of battery demand have prompted battery manufacturers to simplify the process flow, reduce the process time to improve the production efficiency to meet market requirements, and continuously improve the comprehensive electrochemical performance of the battery to meet application requirements.
The lithium ion battery assembly process generally needs the procedures of pole piece preparation, lamination or winding, welding, packaging, baking, liquid injection, standing, formation, air bag removal, secondary sealing and capacity grading. For an organic electrolyte battery, the battery core needs to be baked and dried, and then the electrolyte is injected, the battery core injected with the electrolyte generally still stands for a period of time, and the standing refers to a process that the electrolyte slowly infiltrates the pole piece and the diaphragm. In the prior art, the standing time is usually 24 hours at high temperature or 48 hours at normal temperature, the formation process is started after the pole piece and the diaphragm are fully soaked by the electrolyte, the processes are complicated, the consumed time is long, and a large amount of time cost is occupied.
In addition, in the process after the formation of the battery, it is necessary to evacuate the battery through a liquid injection port provided on the surface of the battery, and to discharge the gas generated by the formation through the liquid injection port. However, when the gas is exhausted, a part of the electrolyte is exhausted from the battery along with the gas, which results in the loss of the electrolyte and affects the electrical performance of the battery and the electrical uniformity among battery batches.
Disclosure of Invention
One of the objects of the present invention is: the lithium ion battery assembling method can effectively reduce the standing time after liquid injection and can also ensure the electrical consistency among battery batches.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of assembling a lithium ion battery, comprising the operations of:
baking the positive plate, the negative plate and the diaphragm to obtain a baked positive plate, a baked negative plate and a baked diaphragm;
laminating and/or winding the baked positive plate, the baked negative plate and the baked diaphragm;
welding a tab to obtain a naked electric core;
step four, placing the naked electric core in an electrolyte for soaking to obtain an electric core soaked by the electrolyte;
step five, the battery cell soaked by the electrolyte is placed into a shell and packaged;
and step six, forming and packaging the battery cell packaged in the step five to obtain the lithium ion battery.
As an improvement of the lithium ion battery assembling method, in the step one, the baking is carried out in an environment with vacuum and dew point lower than-35 ℃. The positive plate, the negative plate and the diaphragm are all baked to be beneficial to improving the infiltration efficiency of the electrolyte.
In the first step, the moisture content of the baked positive plate and the baked negative plate is less than 300 ppm.
In the first step, the moisture content of the baked separator is less than 300 ppm.
As an improvement of the lithium ion battery assembling method, in the steps from the second step to the fifth step, the operating environment is that the dew point is lower than minus 35 ℃. The purpose of the low dew point environment is to prevent the moisture in the air and the lithium hexafluorophosphate in the electrolyte from reacting to generate hydrofluoric acid, so that the electrode material is corroded, and the electrochemical performance and the safety performance of the battery are influenced.
In the fourth step, the temperature of the electrolyte is 20-75 ℃. The temperature of the electrolyte is too low, the fluidity is low, and the pole piece and the diaphragm are difficult to quickly soak; the electrolyte temperature is too high, and decomposition and gas generation can occur.
In the fourth step, the bare cell is soaked in the electrolyte for 1-600 s. The soaking time is too short, the pole piece and the diaphragm cannot be fully soaked by the electrolyte, still standing is needed for a period of time, and the production efficiency is not improved; the soaking time is too long, the pole piece and the diaphragm are fully soaked by the electrolyte, the production efficiency is influenced by the too long soaking time, and the productivity is reduced.
As an improvement of the lithium ion battery assembling method of the present invention, after the third step, the method further includes weighing the bare cell.
As an improvement of the lithium ion battery assembling method of the present invention, in the sixth step, the method further includes weighing and replenishing the formed battery cell. After formation is finished, the weight of the battery core is weighed, the battery core weight is compared with the designed battery core weight, and then the electrolyte for comparing the difference value is supplemented, so that the total amount of electrolyte liquid basically keeps consistent, and the improvement of the electrical property consistency among battery batches is facilitated.
Another object of the present invention is to provide a lithium ion battery prepared by the method described in any of the above paragraphs.
The beneficial effects of the invention include but are not limited to: the invention provides a lithium ion battery assembling method, firstly, baking a battery pole piece and a diaphragm, compared with baking after packaging, the method has the advantages that heat can quickly permeate the pole piece and the diaphragm, the baking time is short, the baking procedure after packaging in the prior art is omitted, and the online time of the battery is shortened; secondly, directly soaking the bare cell into the electrolyte, ensuring that the battery pole piece and the diaphragm are fully soaked by the electrolyte, and ensuring the electrical consistency among battery batches; in addition, the method of the invention can shorten the standing time of the battery after liquid injection and improve the production efficiency. The lithium ion battery prepared by the method has high safety performance and good cycle performance.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
Example 1
(1) Preparing a positive electrode: preparing high-voltage positive electrode active materials, namely high-voltage 4.45V lithium cobaltate, CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) according to a mass ratio of 98.5: 0.5: 1.0, uniformly mixing, and then dispersing in N-methyl-2-pyrrolidone to obtain anode slurry; and uniformly coating the anode slurry on two sides of the aluminum foil, and rolling and cutting to obtain the anode plate.
(2) Preparing a negative electrode: mixing an artificial graphite negative electrode material, acetylene black, CMC (carboxymethyl cellulose) and SBR (carboxyl styrene butadiene rubber) according to a mass ratio of 96.8: 1.0: 1.2: 1.0, uniformly mixing, and then dispersing in deionized water to obtain cathode slurry; and uniformly coating the negative electrode slurry on two surfaces of the copper foil, and rolling and cutting to obtain the negative electrode sheet.
(3) Preparing electrolyte: in a nitrogen-filled glove box (O)2＜2ppm，H2O is less than 3ppm), mixing ethylene carbonate, propylene carbonate, ethyl methyl carbonate and diethyl carbonate according to a mass ratio of 2: 2: 1: 5, uniformly mixing to prepare a non-aqueous organic solvent; then taking a nonaqueous organic solvent accounting for 78% of the total mass of the electrolyte, and adding fluoroethylene carbonate accounting for 4% of the total mass of the electrolyte and 1, 3-propane sultone accounting for 3% of the total mass of the electrolyte to obtain a mixed solution; and slowly adding a mixture of lithium hexafluorophosphate and lithium difluorooxalate phosphate accounting for 15% of the total mass of the electrolyte into the mixed solution to prepare a lithium salt solution of which the concentration of the lithium hexafluorophosphate is 1.2mol/L, and uniformly mixing to obtain the electrolyte.
(4) Assembling the lithium ion battery:
baking the positive plate, the negative plate and the diaphragm in an environment with a vacuum and a dew point lower than-35 ℃ to obtain a baked positive plate, a baked negative plate and a baked diaphragm, wherein the moisture content of the baked positive plate and the baked negative plate is less than 300ppm, and the moisture content of the baked diaphragm is less than 300 ppm;
laminating and/or winding the baked positive plate, the baked negative plate and the baked diaphragm in a dry environment with the dew point lower than-35 ℃;
welding a tab in a dry environment with the dew point lower than-35 ℃ to obtain a naked battery cell and weighing the naked battery cell;
step four, placing the naked battery cell in an electrolyte at the temperature of 45 ℃ for soaking for 300s in a dry environment with the dew point lower than-35 ℃ to obtain the battery cell soaked by the electrolyte; removing redundant electrolyte on the surface of the battery core;
placing the battery cell soaked by the electrolyte in a shell with a formed exhaust port reserved in the dry environment with the dew point lower than-35 ℃, packaging the part except the formed exhaust port, and weighing;
and step six, weighing the weight of the battery cell after the battery cell packaged in the step five is formed and formed, comparing the weight of the battery cell with the weight of the designed battery cell, supplementing electrolyte for comparing the difference, and performing secondary packaging and capacity grading to obtain the lithium ion battery.
Example 2
The difference from example 1 is the assembly of the lithium ion battery: the temperature of the electrolyte was 20 ℃.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 1 is the assembly of the lithium ion battery: the temperature of the electrolyte was 75 ℃.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from example 1 is the assembly of the lithium ion battery: and the bare cell is soaked in the electrolyte for 1 s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
The difference from example 1 is the assembly of the lithium ion battery: the time for soaking the naked electric core in the electrolyte is 600 s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 6
The difference from example 1 is the assembly of the lithium ion battery: the shell is a square aluminum shell.
The rest is the same as embodiment 1, and the description is omitted here.
Example 7
The difference from example 1 is the assembly of the lithium ion battery: the shell is a cylindrical steel shell.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 1
The difference from example 1 is the assembly of the lithium ion battery: and (3) sequentially laminating the lithium cobaltate positive plate, the diaphragm and the negative plate, welding a tab to obtain a bare cell, and carrying out aluminum plastic film packaging, baking, liquid injection, standing for 48 hours, formation, gas storage bag, secondary sealing and capacity grading to finish the preparation of the lithium ion soft package battery.
The rest is the same as comparative example 1 and will not be described herein.
Comparative example 2
The difference from comparative example 1 is the assembly of the lithium ion battery: the standing time was 4 hours.
The rest is the same as comparative example 1 and will not be described herein.
The following tests were carried out on the batteries prepared in examples 1 to 5 and comparative examples 1 to 2:
(1) and (3) testing the normal-temperature cycle performance: the battery after formation was charged to 4.45V (0.01C for cutoff current) at 25 ℃ with a constant current and constant voltage of 0.5C, and then discharged to 3.0V with a constant current of 0.5C, and the retention of the cycle capacity at 600 cycles of charge/discharge was calculated as follows:
capacity retention (%) at 600 cycles was 600 cycles discharge capacity/1 cycle discharge capacity × 100%.
(2) Testing the pole piece infiltration effect: and (5) fully charging the battery after grading the capacity, and disassembling and checking the state of the pole piece.
The test results are:
(1) the retention ratios of the cycle capacities in examples 1 to 5 were 88%, 87%, 89%, 86%, and 88%. The cycle capacity retention rates of comparative examples 1 to 2 were 84% and 68%, respectively.
(2) The surfaces of the cathodes of the examples 1 to 5 and the comparative example 1 are golden yellow, uniform in color, free from abnormal conditions and good in infiltration; the negative pole piece of comparative example 2 was not uniform in color, showing poor wetting effect.
From the examples 1 to 5, it can be seen that the cycle capacity retention rate of the lithium ion battery prepared by the method is close, which indicates that the bare cell is directly soaked in the electrolyte, so that the electrolyte can be ensured to fully soak the battery pole piece and the diaphragm, and the subsequent liquid supplementing process is added according to the design weight, so that the electrical consistency among battery batches can be ensured.
According to the embodiments 1-5 and the comparative examples 1-2, the lithium ion battery prepared by the method disclosed by the invention has the advantages that the electrolyte infiltration effect is enhanced, the cycle performance is improved, the standing time after battery liquid injection can be shortened, and the production efficiency is improved.
In conclusion, the lithium ion battery assembling method provided by the invention directly soaks the bare cell into the electrolyte, ensures that the battery pole piece and the diaphragm are fully soaked by the electrolyte, and then increases the liquid supplementing procedure according to the design weight, can ensure the electrical consistency among battery batches, can shorten the standing time after the battery is injected, and improves the production efficiency. The lithium ion battery provided by the invention enhances the electrolyte infiltration effect and improves the cycle performance of the battery. The invention can simultaneously infiltrate a plurality of naked electric cores into the electrolyte, thereby obviously improving the production efficiency.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A method of assembling a lithium ion battery, comprising the acts of:
baking the positive plate, the negative plate and the diaphragm to obtain a baked positive plate, a baked negative plate and a baked diaphragm;
laminating and/or winding the baked positive plate, the baked negative plate and the baked diaphragm;
welding a tab to obtain a naked electric core;
step four, placing the naked electric core in an electrolyte for soaking to obtain an electric core soaked by the electrolyte;
step five, the battery cell soaked by the electrolyte is placed into a shell and packaged;
and step six, forming and packaging the battery cell packaged in the step five to obtain the lithium ion battery.
2. The method of claim 1, wherein in step one, the baking is performed in an environment with a vacuum and a dew point of less than-35 ℃.
3. The method of assembling a lithium ion battery according to claim 1, wherein in step one, the moisture content of the baked positive electrode sheet and the baked negative electrode sheet is less than 300 ppm.
4. The method of claim 1, wherein in step one, the moisture content of the baked separator is less than 300 ppm.
5. The method of claim 1, wherein the operating environment is at a dew point of less than-35 ℃ in steps two through five.
6. The method of claim 1, wherein in step four, the temperature of the electrolyte is 20 to 75 ℃.
7. The method for assembling the lithium ion battery of claim 1, wherein in the fourth step, the bare cell is immersed in the electrolyte for 1-600 s.
8. The method of assembling a lithium ion battery of claim 1, further comprising weighing the bare cell after step three.
9. The method for assembling the lithium ion battery of claim 1, wherein in the sixth step, the method further comprises weighing and replenishing the formed battery cell.
10. A lithium ion battery prepared by the method of any one of claims 1 to 9.
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Cited By (5)
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| CN112448041A (en) * | 2020-11-30 | 2021-03-05 | 珠海冠宇电池股份有限公司 | Production method of soft package lithium ion battery |
| CN112510267A (en) * | 2020-12-24 | 2021-03-16 | 惠州市超聚电池有限公司 | Winding method of battery cell pole piece and battery cell preparation method |
| CN112649739A (en) * | 2020-12-22 | 2021-04-13 | 惠州亿纬创能电池有限公司 | Method and device for determining standing time after battery liquid injection |
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| CN114824531A (en) * | 2022-05-30 | 2022-07-29 | 重庆太蓝新能源有限公司 | Electrode infiltration method, lithium ion battery cell and lithium ion battery |
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