CN112077460A - Method for manufacturing tab - Google Patents

Method for manufacturing tab Download PDF

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Publication number
CN112077460A
CN112077460A CN202010874874.5A CN202010874874A CN112077460A CN 112077460 A CN112077460 A CN 112077460A CN 202010874874 A CN202010874874 A CN 202010874874A CN 112077460 A CN112077460 A CN 112077460A
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China
Prior art keywords
tab
glue
metal strips
tab glue
metal
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Pending
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CN202010874874.5A
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Chinese (zh)
Inventor
黄运兴
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Dongguan Hengyuan New Materials Co ltd
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Dongguan Hengyuan New Materials Co ltd
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Priority to CN202010874874.5A priority Critical patent/CN112077460A/en
Publication of CN112077460A publication Critical patent/CN112077460A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Laser Beam Processing (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention belongs to the technical field of battery production, and particularly relates to a tab preparation method, which comprises the following steps: 1) unreeling a plurality of metal strips, and positioning the metal strips to enable a gap to be reserved between every two adjacent metal strips; 2) symmetrically sticking a large tab adhesive to two surfaces of the metal strips to fix the large tab adhesive and the metal strips together; 3) pressing the area, which is not covered by the metal belt, of the large tab glue, so that the two surfaces of the large tab glue are bonded together; 4) and carrying out laser cutting on the large tab glue which is not covered with the metal belt to obtain a plurality of tabs with the tab glue. Compared with the prior art, the preparation method provided by the invention has the advantages that the slitting precision is improved, and the product yield is improved.

Description

Method for manufacturing tab
Technical Field
The invention belongs to the technical field of battery production, and particularly relates to a tab preparation method.
Background
Lithium ion batteries have been widely used in various portable electrical appliances and communication devices because of their advantages of high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, no pollution, etc.
With the continuous change of electrical appliances, people put forward new requirements on lithium ion batteries, and the lithium ion batteries are continuously improved in performance and also continuously changed in structure. The flexible package lithium ion battery adopts the composite aluminum plastic film as the shell, has good safety, has the advantage of light weight compared with a steel shell battery and an aluminum shell battery, and is developed in various fields of application of the lithium ion battery.
The technology adopted by the soft package lithium ion battery industry at present is that a positive plate, a diaphragm and a negative plate are sequentially wound or superposed to form a battery cell, a positive electrode tab is led out of the positive plate, and a negative electrode tab is led out of the negative plate; and then wrapping the battery cell in the aluminum-plastic composite film, and carrying out top sealing and side sealing to form the flexible package lithium ion battery. The positive electrode tab and the negative electrode tab are generally composed of a metal belt and tabs symmetrically attached to two surfaces of the metal belt, and the tab glue mainly plays an insulating role and prevents the metal belt from being in direct contact with an aluminum plastic film to form a short circuit.
The existing tab preparation method is to directly paste a square strip tab adhesive on each metal strip, and then cut the tab adhesive into a shape required actually by a die cutter. However, the efficiency of independent rubberizing of each metal strip is low, so the following solutions are available: firstly, a plurality of metal belts are positioned, a square tab adhesive is taken, the tab is adhered to the surfaces of the plurality of metal belts, and then die cutting is carried out on the tab adhesive between two adjacent metal belts. However, the die cutting precision of the die cutting rule is limited, which causes deviation, resulting in poor consistency among the obtained tabs and affecting the product yield. Particularly, with the miniaturization requirement of batteries in some fields, the smaller the battery size is, the smaller the size of the tab used is, and the deviation has a greater influence on the yield of the tab.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the method for manufacturing the tab is provided, so that the precision is improved, and the product yield is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for manufacturing a tab comprises the following steps:
1) unreeling a plurality of metal strips, and positioning the metal strips to enable a gap to be reserved between every two adjacent metal strips;
2) symmetrically sticking a large tab adhesive to two surfaces of the metal strips to fix the large tab adhesive and the metal strips together;
3) pressing the area, which is not covered by the metal belt, of the large tab glue, so that the two surfaces of the large tab glue are bonded together;
4) and carrying out laser cutting on the large tab glue which is not covered with the metal belt to obtain a plurality of tabs with the tab glue.
The method comprises the steps of cutting a large tab film which is not covered by a metal belt by laser, wherein the shape of the tab film on each tab obtained after cutting can be square, trapezoid, quasi-square or other irregular figures. The specific shape of the tab glue is determined by the shape of a laser parting line, and the laser parting line can be a vertical straight line, an inclined straight line, an arc line or a wavy line and the like.
The laser cutting comprises at least one of ultraviolet laser cutting, picosecond laser cutting and nanosecond laser cutting.
As an improvement of the tab preparation method of the present invention, in step 2), both ends of the plurality of metal strips are not covered with the large tab glue.
In step 2), the length of the tab glue exceeding the metal strips at the edges is a, and the gap between two adjacent metal strips is b, wherein b is greater than a.
As an improvement of the tab preparation method of the present invention, when b is 2a, the large tab adhesive is cut by laser along the middle position of the gap.
As an improvement of the tab preparation method, when b is less than 2a, laser cutting is carried out on the large tab glue along the left position of the gap.
When b is larger than 2a, laser cutting is carried out on the large tab glue along the position on the right side of the gap.
As an improvement of the tab preparation method, the large tab adhesive is of a regular square structure, or comprises a plurality of same special-shaped units.
As an improvement of the tab preparation method, between the step 3) and the step 4), the method further comprises the step of cutting the large tab adhesive to obtain the large tab adhesive with a plurality of same special-shaped units. The cutting may also be laser cutting, such as ultraviolet laser cutting, picosecond laser cutting, nanosecond laser cutting, and the like.
As an improvement of the tab preparation method of the present invention, the metal belt includes any one of a nickel belt, an aluminum belt, a copper belt, a composite metal belt and an aluminum-to-nickel belt.
Compared with the prior art, the beneficial effects of the invention include but are not limited to:
1) the invention cuts the large tab glue by adopting a laser cutting method, and has the advantages of high precision, small deviation, good consistency and high product yield.
2) The invention adopts the method of firstly attaching a large tab adhesive and then positioning and laser cutting the tab adhesive, so that the production efficiency is higher.
Drawings
Fig. 1 is a schematic structural view of a large tab adhesive of embodiment 1 of the present invention before being cut.
Fig. 2 is a schematic structural view of a large tab film slit in embodiment 1 of the invention.
Fig. 3 is a schematic structural view of a large tab adhesive of embodiment 2 of the invention before being cut.
Fig. 4 is a schematic structural view of a large tab film slit in embodiment 2 of the invention.
Fig. 5 is a schematic structural view of a large tab of the embodiment 3 of the invention before slitting.
Fig. 6 is a schematic structural view of a large tab film slit in embodiment 3 of the invention.
Fig. 7 is a schematic structural view of a large tab of the present invention before slitting.
Fig. 8 is a schematic structural view of a large tab film slit in embodiment 4 of the invention.
Wherein: 1-metal band, 2-large tab glue and 3-gap.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings, but the embodiments of the invention are not limited thereto.
Example 1
Referring to fig. 1 to 2, a tab preparation method includes the following steps:
1) unreeling a plurality of metal strips 1, and positioning the plurality of metal strips 1 to enable a gap 3 to be reserved between every two adjacent metal strips 1;
2) symmetrically sticking a large tab glue 2 on two surfaces of a plurality of metal strips 1 to fix the large tab glue 2 and the plurality of metal strips 1 together; the large tab glue 2 is of a regular square structure, the two ends of the metal strips 1 are not covered with the large tab glue 2, the length of the large tab glue 2 exceeding the metal strips 1 at the edges is a, the gap between every two adjacent metal strips 1 is b, and b is 2 a;
3) pressing the area, which is not covered by the metal belt 1, of the large tab glue 2 to enable the large tab glue 2 on the two sides to be bonded together;
4) and (3) carrying out ultraviolet laser cutting on the large tab glue 2 along the middle position of the gap 3 to obtain a plurality of tabs with tab glue.
The metal belt 1 includes any one of a nickel belt, an aluminum belt, a copper belt, a composite metal belt and an aluminum-to-nickel belt. The tab glue is any one of the existing tab glues in the field, and is not particularly limited.
Example 2
Referring to fig. 3 to 4, a tab preparation method includes the following steps:
1) unreeling a plurality of metal strips 1, and positioning the metal strips 1 to enable a gap 3 to be reserved between every two adjacent metal strips 1;
2) symmetrically sticking a large tab glue 2 on two surfaces of a plurality of metal strips 1 to fix the large tab glue 2 and the plurality of metal strips 1 together; the large tab glue 2 is of a regular square structure, the two ends of the metal strips 1 are not covered with the large tab glue 2, the length of the large tab glue 2 exceeding the metal strips 1 at the edges is a, the gap between every two adjacent metal strips 1 is b, and b is less than 2 a;
3) pressing the area, which is not covered by the metal belt 1, of the large tab glue 2 to enable the large tab glue 1 on the two sides to be bonded together;
4) and (3) carrying out picosecond laser cutting on the large tab glue 2 along the left position of the gap 3 to obtain a plurality of tabs with tab glue.
The metal belt 1 includes any one of a nickel belt, an aluminum belt, a copper belt, a composite metal belt and an aluminum-to-nickel belt. The tab glue is any one of the existing tab glues in the field, and is not particularly limited.
Example 3
Referring to fig. 5 to 6, a tab preparation method includes the following steps:
1) unreeling a plurality of metal strips 1, and positioning the plurality of metal strips 1 to enable a gap 3 to be reserved between every two adjacent metal strips 1;
2) symmetrically sticking a large tab glue 2 on two surfaces of a plurality of metal strips 1 to fix the large tab glue 2 and the plurality of metal strips 1 together; the large tab glue 2 is of a regular square structure, the two ends of the metal strips 1 are not covered with the large tab glue 2, the length of the large tab glue 2 exceeding the metal strips 1 at the edges is a, the gap between two adjacent metal strips 1 is b, and b is greater than 2 a;
3) pressing the area, which is not covered by the metal belt 1, of the large tab glue 2 to enable the large tab glue 2 on the two sides to be bonded together;
4) and (3) carrying out nanosecond laser cutting on the large tab glue 2 along the right position of the gap 3 to obtain a plurality of tabs with tab glue.
The metal belt 1 includes any one of a nickel belt, an aluminum belt, a copper belt, a composite metal belt and an aluminum-to-nickel belt. The tab glue is any one of the existing tab glues in the field, and is not particularly limited.
Example 4
Referring to fig. 7 to 8, a tab preparation method includes the following steps:
1) unreeling a plurality of metal strips 1, and positioning the metal strips 1 to enable a gap to be reserved between every two adjacent metal strips 1;
2) symmetrically sticking a large tab glue 2 on two surfaces of a plurality of metal strips 1 to fix the large tab glue 2 and the plurality of metal strips 1 together; the two ends of the metal belts 1 are not covered with large tab glue 2, the length of the large tab glue 2 exceeding the metal belt 1 at the edge is a, the gap between two adjacent metal belts 1 is b, and b is 2 a;
3) pressing the area, which is not covered by the metal belt 1, of the large tab glue 2 to enable the large tab glue 2 on the two sides to be bonded together;
4) and (3) carrying out ultraviolet laser cutting on the large tab glue 1 along the middle position of the gap 3 to obtain a plurality of tabs with tab glue.
The metal belt 1 includes any one of a nickel belt, an aluminum belt, a copper belt, a composite metal belt and an aluminum-to-nickel belt. The tab glue is any one of the existing tab glues in the field, and is not particularly limited.
It should be noted that the large tab glue 2 of the present embodiment includes a plurality of identical special-shaped units, which may be cut in advance, or obtained by cutting the large tab glue 2 before step 4). Of course, the special-shaped units in the large tab glue 2 of the present invention are not limited to the shapes listed in the embodiment, and the shapes can be changed according to the actual packaging requirements.
Comparative example 1
The difference from example 1 is:
in the step 4), a die-cutting rule is adopted for cutting the large tab glue.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 2
The difference from example 2 is:
in the step 4), a die-cutting rule is adopted for cutting the large tab glue.
The rest is the same as embodiment 2, and the description is omitted here.
Comparative example 3
The difference from example 3 is:
in the step 4), a die-cutting rule is adopted for cutting the large tab glue.
The rest is the same as embodiment 3, and the description is omitted here.
Comparative example 4
The difference from example 4 is:
in the step 4), a die-cutting rule is adopted for cutting the large tab glue.
The rest is the same as embodiment 4, and the description is omitted here.
Performance testing
20 pieces of tab prepared in the embodiments 1-4 and the comparative examples 1-4 are respectively taken for detection, the actual length of the tab glue exceeding the metal belt is measured, the actual length is compared with the preset length to obtain difference values, the relative average deviation of 20 difference values in each group is calculated, the smaller the relative average deviation is, the higher the description precision is, and the better the product consistency is. The results are shown in Table 1.
TABLE 1 test results
Figure BDA0002652321620000071
The test results in table 1 show that the tab prepared by the preparation method of the invention has the advantages of small average deviation value, good consistency and high tab yield. The laser slitting machine is high in laser slitting precision, easy to flexibly process and free of die damage, so that slitting is accurate. In addition, the cutting speed of laser cutting is higher than the cutting efficiency of the die-cutting rule.
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. The preparation method of the tab is characterized by comprising the following steps:
1) unreeling a plurality of metal strips, and positioning the metal strips to enable a gap to be reserved between every two adjacent metal strips;
2) symmetrically sticking a large tab adhesive to two surfaces of the metal strips to fix the large tab adhesive and the metal strips together;
3) pressing the area, which is not covered by the metal belt, of the large tab glue, so that the two surfaces of the large tab glue are bonded together;
4) and carrying out laser cutting on the large tab glue which is not covered with the metal belt to obtain a plurality of tabs with the tab glue.
2. The tab preparation method of claim 1, wherein the laser dicing includes at least one of ultraviolet laser dicing, picosecond laser dicing, and nanosecond laser dicing.
3. The tab preparation method as claimed in claim 1, wherein in the step 2), both ends of a plurality of metal strips are not covered with the tab glue.
4. The tab preparation method as claimed in claim 1, wherein in the step 2), the length of the tab glue beyond the metal strips at the edges is a, the gap between two adjacent metal strips is b, and b > a.
5. The method as claimed in claim 4, wherein when b is 2a, the large tab adhesive is laser cut along the middle position of the gap.
6. The tab preparation method of claim 4, wherein when b is less than 2a, the large tab glue is laser cut along the left position of the gap.
7. The tab preparation method of claim 4, wherein when b > 2a, the large tab glue is laser cut along the right position of the gap.
8. The tab preparation method as claimed in claim 1, wherein the large tab glue is a regular square structure, or the large tab glue comprises a plurality of identical special-shaped units.
9. The method for preparing the tab as claimed in claim 1, further comprising cutting the tab glue to obtain a tab glue having a plurality of identical profiled units between the step 3) and the step 4).
10. The method for preparing the tab as claimed in claim 1, wherein the metal strip comprises any one of a nickel strip, an aluminum strip, a copper strip, a composite metal strip and an aluminum-to-nickel strip.
CN202010874874.5A 2020-08-27 2020-08-27 Method for manufacturing tab Pending CN112077460A (en)

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Publications (1)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103490031A (en) * 2013-08-09 2014-01-01 范能文 Positive tab, soft package lithium ion battery and method for manufacturing positive tab
CN105140458A (en) * 2015-07-30 2015-12-09 深圳市文壹科技有限公司 Manufacturing process for non-joint aluminum coated non-aluminum metal tab
CN105280872A (en) * 2015-10-20 2016-01-27 范能文 Belt type tab, and manufacturing method and use method therefor
KR20160048527A (en) * 2014-10-24 2016-05-04 주식회사 엘지화학 A Cutting Method of Irregular Cell and the Irregular Cell Manufactured by The Same
CN110265617A (en) * 2019-07-23 2019-09-20 东莞市恒源新材料有限公司 A kind of tab with special-shaped gel and preparation method thereof, lithium ion battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103490031A (en) * 2013-08-09 2014-01-01 范能文 Positive tab, soft package lithium ion battery and method for manufacturing positive tab
KR20160048527A (en) * 2014-10-24 2016-05-04 주식회사 엘지화학 A Cutting Method of Irregular Cell and the Irregular Cell Manufactured by The Same
CN105140458A (en) * 2015-07-30 2015-12-09 深圳市文壹科技有限公司 Manufacturing process for non-joint aluminum coated non-aluminum metal tab
CN105280872A (en) * 2015-10-20 2016-01-27 范能文 Belt type tab, and manufacturing method and use method therefor
CN110265617A (en) * 2019-07-23 2019-09-20 东莞市恒源新材料有限公司 A kind of tab with special-shaped gel and preparation method thereof, lithium ion battery

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