CN114221065A - Manufacturing method of square cylindrical shell for lithium ion battery - Google Patents
Manufacturing method of square cylindrical shell for lithium ion battery Download PDFInfo
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- CN114221065A CN114221065A CN202111322020.7A CN202111322020A CN114221065A CN 114221065 A CN114221065 A CN 114221065A CN 202111322020 A CN202111322020 A CN 202111322020A CN 114221065 A CN114221065 A CN 114221065A
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- square cylindrical
- cylindrical shell
- manufacturing
- lithium ion
- ion battery
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000001125 extrusion Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
A manufacturing method of a square cylindrical shell for a lithium ion battery comprises the steps of preheating materials to be processed, preheating processed clamps and equipment, carrying out primary extrusion on the materials to form the square cylindrical shell, cooling the square cylindrical shell, preliminarily straightening the square cylindrical shell, cutting the square cylindrical shell into small sections, carrying out necking treatment on one end of the square cylindrical shell, and carrying out secondary fine pumping processing on the square cylindrical shell; the invention can combine the machining method and the stretching method to effectively improve the product performance of the square cylindrical shell, and the machining method is simple and efficient and is suitable for the mass production of novel square cylindrical lithium batteries.
Description
Technical Field
The invention belongs to the field of battery manufacturing, and particularly relates to a manufacturing method of a square cylindrical shell for a lithium ion battery.
Background
At present, with the rapid development of a new energy industry chain, the traditional battery is gradually diversified and popularized. The existing batteries can be divided into power batteries and energy storage batteries at present, and along with the leap-type growth of the new energy industry of the batteries, the batteries are gradually close to the lives of people, and the requirements of people on the batteries are correspondingly improved, wherein the energy density, the service life, the stability for coping with extreme environments, the safety and the reliability in use and the like of the lithium batteries also become the focus of increasing attention of people.
In order to meet the requirements of energy density, service life, safety and reliability of a lithium battery, a square cylindrical battery is produced as soon as possible, a square strip structure is adopted for a shell of the square cylindrical battery (as shown in fig. 2), and a cylindrical structure is adopted for a central tube in the battery and positive and negative electrode assembly interfaces on the shell; the casing of the square cylindrical battery has the characteristics of both the cylindrical battery and the square battery, more space is reserved in the battery for storing electrolyte, and the problems of gas generated in the battery and the like are solved. Finally, the cycle service life of the battery is prolonged, and the internal energy density of the lithium battery is improved.
At present, the manufacturing method of the square cylindrical shell body comprises two methods, namely a machining method and a stretching method. The machining method has the advantages that the dimensional tolerance of the square cylindrical shell can be accurately controlled, the appearance of the cylindrical shell is good, and the machining method has the defects of high machining cost, long manufacturing time, low efficiency, complex working procedure and high dependence on machining technology; the advantages of the stretch-forming method are that the square cylindrical shell has high processing efficiency, low cost, simple processing procedure and low dependence on processing technology, and the draw-forming method has the disadvantages that the final dimensional tolerance of the shell is not accurate enough and the appearance of the shell is poor. Therefore, how to combine the advantages and disadvantages of the two methods is one of the difficulties which are urgently needed to be solved at present.
Disclosure of Invention
The invention aims to solve the problems and provides a method for manufacturing a square cylindrical shell for a lithium ion battery, which can be combined with a mechanical processing method and a stretching manufacturing method to effectively improve the product performance of the square cylindrical shell, is simple and efficient in processing method, and is suitable for the mass production of novel square cylindrical lithium batteries.
The technical scheme of the invention is a method for manufacturing a square cylindrical shell for a lithium ion battery, which comprises the following steps,
step 1: preheating a material to be processed to reach a temperature required by processing;
step 2: preheating the processed clamp and the extrusion equipment to enable the temperature of the clamp and the extrusion equipment to be close to the temperature of the material processed in the step 1;
and step 3: placing the material and the clamp on an extrusion device and extruding the material to shape the processed material into a square cylinder shape;
and 4, step 4: cooling the formed square cylindrical shell;
and 5: straightening the square cylindrical shell cooled in the step (4);
step 6: cutting the square cylindrical shell straightened in the step 5 into small sections;
and 7: and (6) necking one end of the small-section square cylindrical shell in the step (6), fixing a tensile machine at the necked end, and performing fine pumping outwards to enable the size specification of the square cylindrical shell to reach the final required standard.
In the step 1, the processed material is an AI3003 type metal round bar, the preheating temperature of the material is controlled to be 480-520 ℃, and the preheating time is controlled to be 3-4 hours. The preheating temperature of the material is controlled to be 480-520 ℃, and the preheating time is controlled to be 3-4 hours.
In the step 2, the preheating temperature of the processed clamp is set to be 400-420 ℃, and the preheating time is 2-3 h; preheating the extrusion equipment at 380-400 ℃ for 45-60 min; the final preheat temperature of the fixture and extrusion equipment must be close to the temperature of the material being processed to prevent abnormal conditions of the material during step 3 extrusion due to temperature mismatch.
In the steps 3 and 4, the output pressure of a press machine adopted during material extrusion is controlled to be 180-200 pa, the extrusion speed is controlled to be 3.2-4 mm/s, and the cooling time after extrusion is set to be 2-3 min.
In step 5, the output tension of the straightening machine for straightening the square cylindrical shell is set between 400N and 500N, and the straightening duration is controlled within 2S to 3S to prevent the square cylindrical shell from reversely deforming.
In step 6, the square cylindrical shell is cut into small sections of about 2m to prevent the square cylindrical shell from bending during subsequent transportation and processing.
In step 7, the purpose of necking one end of the square cylindrical shell is to fix the die head of the fine drawing clamp at the port of the square cylindrical shell so as to perform fine drawing on the square cylindrical shell outwards in the following process; the output tension of a tension machine used in the fine drawing of the square cylindrical shell is controlled to be 880-1000N, and the duration of the fine drawing is controlled to be about 2S, so that the square cylindrical shell is prevented from being reversely deformed after being formed.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the extrusion molding is carried out according to the initial size, and then the secondary drawing molding is carried out according to the accurate size, so that the size precision of the square cylindrical shell is greatly improved, and the processing efficiency is effectively improved;
2. according to the invention, the material and the processing equipment are preheated, so that the stress of the material can be effectively reduced, the extrusion and the qualification of the material are facilitated, and the energy consumption required by processing is also reduced;
3. according to the invention, by performing sectional cutting and straightening molding on the material, the material can be effectively prevented from deforming in the processing process, the processed material is prevented from being scrapped, and the production cost is reduced.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of a production process of the present invention;
fig. 2 is a schematic view of a square cylindrical battery (including a case) according to the present invention.
Detailed Description
Example 1:
a manufacturing method of a square cylindrical shell for a lithium ion battery comprises the following steps.
Step 1: preheating the AI3003 type metal round bar, wherein the preheating temperature is set to 510 ℃, and the preheating time is 3h, so that the AI3003 metal round bar is softened and meets the processing requirement.
Step 2: preheating the processed clamp and the extruder, wherein the preheating temperature of the clamp is set to 410 ℃, and the preheating time is 2 h; the preheating temperature of the extruder is set to be 390 ℃, and the preheating time is 50 min; and finally, the temperature of the clamp and the extruding machine reaches the temperature of the preheated AI3003 metal round bar.
And step 3: placing the preheated AI3003 metal round bar and the clamp on a press machine, setting the output pressure value of the press machine to be 190pa, and controlling the extrusion speed of the press machine to be 3.6mm/s in the process of extruding the AI3003 metal round bar so as to shape the AI3003 metal round bar into a square cylinder shape.
And 4, step 4: and standing the formed square cylindrical shell in a normal temperature environment for 3min to enable the internal temperature of the square cylindrical shell to be close to the normal temperature.
And 5: and (4) placing the square cylindrical shell obtained in the step (4) on a straightening machine for preliminary straightening, setting the output tension value of the straightening machine to be 420N, straightening the square cylindrical shell by the straightening machine, keeping the tension for 3S until the square cylindrical shell is in a 16m long strip shape, and keeping the square cylindrical shell straight and not generating reverse deformation after the tension is removed.
Step 6: the 16m long strip square cylindrical shell is cut into small sections, and the length of each small section of square cylindrical shell is 2 m.
And 7: and (3) necking one end of the small square cylindrical shell by using a necking machine, placing the small square cylindrical shell into a tensile machine again after necking is finished, placing a chuck of the tensile machine in the square cylindrical shell and clamping the chuck at the necking end, starting the tensile machine and performing secondary fine drawing on the square cylindrical shell, wherein the output tensile value of the tensile machine is set to 900N in the fine drawing process, and keeping the tensile force for 2S after the final size of the square cylindrical shell reaches the processing requirement until the square cylindrical shell does not deform reversely.
While the present invention has been described with reference to the embodiments, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and those skilled in the art can make various changes and modifications without departing from the spirit and the scope of the invention as defined in the appended claims.
Claims (8)
1. A method for manufacturing a square cylindrical shell for a lithium ion battery is characterized by comprising the following steps of,
step 1: preheating a material to be processed to reach a temperature required by processing;
step 2: preheating the processed clamp and the extrusion equipment to enable the temperature of the clamp and the extrusion equipment to be close to the temperature of the material processed in the step 1;
and step 3: placing the material and the clamp on an extrusion device and extruding the material to shape the processed material into a square cylinder shape;
and 4, step 4: cooling the formed square cylindrical shell;
and 5: straightening the square cylindrical shell cooled in the step (4);
step 6: cutting the square cylindrical shell straightened in the step 5 into small sections;
and 7: and (6) necking one end of the small-section square cylindrical shell in the step (6), fixing a tensile machine at the necked end, and performing fine pumping outwards to enable the size specification of the square cylindrical shell to reach the final required standard.
2. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 1, wherein: in the step 1, the processed material is an AI3003 type metal round bar, the preheating temperature of the material is controlled to be 480-520 ℃, and the preheating time is controlled to be 3-4 hours.
3. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 1, wherein: in the step 2, the preheating temperature of the processed clamp is set to be 400-420 ℃, and the preheating time is 2-3 h; preheating the extrusion equipment at 380-400 ℃ for 45-60 min; the final preheat temperature of the fixture and extrusion equipment must be close to the temperature of the material being processed to prevent abnormal conditions of the material during step 3 extrusion due to temperature mismatch.
4. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 1, wherein: in the steps 3 and 4, the output pressure of a press machine adopted during material extrusion is controlled to be 180-200 pa, the extrusion speed is controlled to be 3.2-4 mm/s, and the cooling time after extrusion is set to be 2-3 min.
5. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 1, wherein: in the step 5, the output tension of the straightening machine for straightening the square cylindrical shell is set between 400N and 500N, and the straightening duration is controlled within 2S to 3S to prevent the square cylindrical shell from reversely deforming.
6. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 1, wherein: in the step 6, in order to prevent the square cylindrical shell from being bent in subsequent transportation and processing, the square cylindrical shell needs to be cut into small sections of 2-3 m.
7. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 1, wherein: in step 7, the purpose of necking one end of the square cylindrical shell is to fix the die head of the fine drawing clamp at the port of the square cylindrical shell so as to perform fine drawing on the square cylindrical shell outwards in the following process.
8. The method for manufacturing a square cylindrical case for a lithium ion battery according to claim 7, wherein: the output tension of a tension machine used in the fine drawing of the square cylindrical shell is controlled to be 880-1000N, and the duration of the fine drawing is controlled to be about 2S, so that the square cylindrical shell is prevented from being reversely deformed after being formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111322020.7A CN114221065A (en) | 2021-11-09 | 2021-11-09 | Manufacturing method of square cylindrical shell for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111322020.7A CN114221065A (en) | 2021-11-09 | 2021-11-09 | Manufacturing method of square cylindrical shell for lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN114221065A true CN114221065A (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111322020.7A Pending CN114221065A (en) | 2021-11-09 | 2021-11-09 | Manufacturing method of square cylindrical shell for lithium ion battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194701A (en) * | 2013-04-28 | 2013-07-10 | 东莞市铝美铝型材有限公司 | Production process for aluminium alloy profile |
| CN105170692A (en) * | 2015-09-30 | 2015-12-23 | 核兴航材（天津）科技有限公司 | Stress control production process of high-strength aluminum alloy pipe |
| CN105838938A (en) * | 2016-05-31 | 2016-08-10 | 广西南南铝加工有限公司 | Preparing method for 6-series aluminum alloy sectional bar |
| CN109433851A (en) * | 2018-11-07 | 2019-03-08 | 南通长海铝业有限公司 | The moulding process and aluminium-alloy pipe of aluminium-alloy pipe |
| CN112517653A (en) * | 2020-11-16 | 2021-03-19 | 四川阳光坚端铝业有限公司 | Aluminum alloy thin-walled tube extrusion process |
-
2021
- 2021-11-09 CN CN202111322020.7A patent/CN114221065A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194701A (en) * | 2013-04-28 | 2013-07-10 | 东莞市铝美铝型材有限公司 | Production process for aluminium alloy profile |
| CN105170692A (en) * | 2015-09-30 | 2015-12-23 | 核兴航材（天津）科技有限公司 | Stress control production process of high-strength aluminum alloy pipe |
| CN105838938A (en) * | 2016-05-31 | 2016-08-10 | 广西南南铝加工有限公司 | Preparing method for 6-series aluminum alloy sectional bar |
| CN109433851A (en) * | 2018-11-07 | 2019-03-08 | 南通长海铝业有限公司 | The moulding process and aluminium-alloy pipe of aluminium-alloy pipe |
| CN112517653A (en) * | 2020-11-16 | 2021-03-19 | 四川阳光坚端铝业有限公司 | Aluminum alloy thin-walled tube extrusion process |
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