CN111916833A - Preparation method of soft package lithium ion battery cell, battery cell and battery module - Google Patents
Preparation method of soft package lithium ion battery cell, battery cell and battery module Download PDFInfo
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- CN111916833A CN111916833A CN202010588079.XA CN202010588079A CN111916833A CN 111916833 A CN111916833 A CN 111916833A CN 202010588079 A CN202010588079 A CN 202010588079A CN 111916833 A CN111916833 A CN 111916833A
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- tab
- lithium ion
- ion battery
- glue
- battery cell
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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 preparation method of a soft package lithium ion battery cell, which comprises the following operations: s1, placing the bare cell in a packaging bag, and exposing the packaging bag outside a tab glue part connected with a tab of the bare cell; and S2, packaging the packaging bag, removing part of the tab glue exposed out of the packaging bag, and obtaining the soft package lithium ion battery cell. The soft package lithium ion battery core prepared by the invention has the advantages that the length of the tab glue finally exposed out of the packaging bag is shortened, and the tab after the tab glue is removed can be directly connected with a PACK protection plate in a PACK process, so that the length of the battery after PACK is reduced, and the length consistency of the tab glue exposed out of the packaging bag is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a soft package lithium ion battery cell, the soft package lithium ion battery cell and a soft package lithium ion battery module.
Background
Soft package lithium ion cell generally includes electric core and the wrapping bag that holds electric core, and the welding has utmost point ear on the electric core, and utmost point ear wears out from the wrapping bag. The packaging of the soft package lithium ion battery cell is realized by the fusion of the tab glue and the PP layer of the packaging bag. In order to ensure the packaging effect, the tab glue is generally required to be exposed out of the packaging bag for a certain length. In the PACK process, a protection plate needs to be welded on a tab metal strip of the battery cell, and because the protection plate cannot be welded on the tab glue, the more the tab glue exposes the length, the farther the distance between a welding spot and a battery cell core body is from the welding protection plate, so that the length of the battery after the PACK is increased.
In view of the above, it is necessary to provide a technical solution to solve the above technical problems.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the preparation method of the soft package lithium ion battery cell is provided, the packaging effect of the tab and the packaging bag is ensured, and the length of the battery after PACK can be reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a soft package lithium ion battery cell comprises the following operations:
s1, placing the bare cell in a packaging bag, and exposing the packaging bag outside a tab glue part connected with a tab of the bare cell;
and S2, packaging the packaging bag, removing part of the tab glue exposed out of the packaging bag, and obtaining the soft package lithium ion battery cell.
As an improvement of the preparation method of the soft-package lithium ion battery cell, the method for removing the tab glue with a part exposed out of the packaging bag comprises any one of laser cleaning, scraping and solvent cleaning. The laser cleaning is preferred, because the cleaning accuracy of the laser cleaning is high, and the power of the laser cleaning is controllable, the exposed redundant tab glue can be accurately removed.
The bare cell comprises a cell body and the tab, one end of the tab is connected with the cell body, the other end of the tab is exposed out of the cell body, the tab comprises a tab body and tab glue covering a part of the tab body, the tab glue comprises an exposed tab glue and a packaged tab glue which are mutually connected, the exposed tab glue is exposed out of the packaging bag, and the packaged tab glue is packaged in the packaging bag.
As an improvement of the preparation method of the soft package lithium ion battery cell, the thickness of the exposed tab glue is smaller than that of the packaged tab glue. The thickness of the packaging tab glue is the same as that of the conventional tab glue, the packaging effect of the tab glue and the packaging bag is ensured when the packaging tab glue is melted, and the thickness of the exposed tab glue is smaller than that of the packaging tab glue, so that the total mass of the melted exposed tab glue is reduced, and the subsequent removal of redundant exposed tab glue is facilitated.
As an improvement of the preparation method of the soft package lithium ion battery cell, the length of the exposed tab glue is 0.2-2 mm. The length of the exposed tab glue cannot be too small, the too small can cause the poor packaging effect of the tab and the packaging bag, and the poor consequences such as liquid leakage and the like are easy to occur at the tab. The length of the exposed tab glue cannot be too long, and the too long length can result in the increase of the length of the battery after the PACK.
As an improvement of the preparation method of the soft package lithium ion battery cell, the thickness of the exposed tab glue is 0.01-0.05 mm. It should be noted that, the thickness of the exposed tab glue on one side of the tab is referred to herein. The thickness of the exposed tab glue cannot be too small, and during hot pressing, the thickness of the exposed tab glue is too small to be sufficiently fused with the PP layer of the packaging bag, so that the packaging effect is reduced. The thickness that exposes utmost point ear and glue can not the excessive thickness, and the excessive thickness can lead to follow-up when PACK welds the protection shield, and unnecessary utmost point ear glues and is not convenient for wash.
As an improvement of the method for manufacturing the soft-package lithium ion battery cell, the tab body includes a first tab portion, a second tab portion and a third tab portion, which are sequentially connected, the first tab portion is exposed out of the packaging bag, the second tab portion is covered by the tab glue, and the third tab portion is disposed inside the battery cell body.
As an improvement of the preparation method of the soft-package lithium ion battery cell, the width of the first pole ear part is greater than the width of the second pole ear part. When single electric core is lamination electricity core, because all there is a utmost point ear on every utmost point piece, a plurality of utmost point ears of lamination electricity core need strict alignment when the welding, just can weld a plurality of utmost point ear, and sets up the width of first utmost point ear for being greater than the width of second utmost point ear, and when a plurality of utmost point ears of single electric core welded, the utmost point ear need not strict alignment also can have good welding effect. For a winding type multi-lug battery cell, a plurality of lugs can be welded without strict alignment, the welding difficulty is reduced, and the yield of the welding procedure is improved.
As an improvement of the preparation method of the soft-package lithium ion battery cell, the width of the second pole ear portion is equal to the width of the third pole ear portion.
As an improvement of the preparation method of the soft package lithium ion battery cell, the joint of the side edge of the exposed tab glue and the battery cell body is in a concave arc shape.
The second purpose of the invention is: the soft package lithium ion battery cell is prepared by the preparation method of the soft package lithium ion battery cell in any one of the preceding specifications.
The third purpose of the invention is that: the utility model provides a soft packet of lithium ion battery module, including the specification the soft packet of lithium ion battery cell in the preamble, expose the wrapping bag the length that the utmost point ear was glued is the same. According to the soft package lithium ion battery module provided by the invention, redundant tab glue exposed out of the packaging bag is removed, the front edge length of the battery cell is reduced, the length consistency of the exposed tab glue of the plurality of battery cells is better, and the length consistency of the finished battery is improved.
Compared with the prior art, the invention at least has the following beneficial effects: the invention provides a preparation method of a soft package lithium ion battery cell, which comprises the following operations: s1, placing the bare cell in a packaging bag, and exposing the packaging bag outside a tab glue part connected with a tab of the bare cell; and S2, packaging the packaging bag, removing part of the tab glue exposed out of the packaging bag, and obtaining the soft package lithium ion battery cell. The soft package lithium ion battery core prepared by the invention has the advantages that the length of the tab glue finally exposed out of the packaging bag is shortened, and the tab after the tab glue is removed can be directly connected with a PACK protection plate in a PACK process, so that the length of the battery after PACK is reduced, and the length consistency of the tab glue exposed out of the packaging bag is improved.
Drawings
Fig. 1 is a flow chart of a method for preparing a soft-package lithium ion battery cell in example 1.
Fig. 2 is a front view of a tab in embodiment 1.
Fig. 3 is a side view of a tab in example 1.
Fig. 4 is a schematic structural diagram of a cell in embodiment 1.
Fig. 5 is a side view of the battery module in example 2.
Fig. 6 is a schematic view of a partial structure of a cell in embodiment 3.
Fig. 7 is a side view of the battery module according to comparative example 2.
Wherein: 1-battery core body, 2-tab, 3-tab body, 31-first tab part, 32-second tab part, 321-tab glue exposed tab part, 322-tab glue packaging tab part, 33-third tab part, 4-tab glue, 41-exposed tab glue, 42-packaging tab glue, 5-protective plate and 6-packaging bag.
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
As shown in fig. 1 to 4, the present embodiment provides a soft-package lithium ion battery cell, and the preparation method includes the following operations:
s1, placing the bare cell in a packaging bag 6, wherein the part of the tab glue 4 connected with the tab 2 of the bare cell is exposed out of the packaging bag 6;
wherein, naked electric core includes electric core body 1 and utmost point ear 2, and the one end of utmost point ear 2 is connected with electric core body 1, and electric core body 1 is exposed to the other end of utmost point ear 2, and utmost point ear 2 includes utmost point ear body 3 and covers the utmost point ear glue 4 of portion utmost point ear body 3, and utmost point ear glue 4 includes interconnect's the utmost point ear glue 41 that exposes and encapsulates utmost point ear glue 42, exposes utmost point ear glue 41 and exposes outside wrapping bag 6, encapsulates utmost point ear glue 42 and encapsulates in wrapping bag 6.
And S2, packaging the packaging bag 6, and removing part of the tab glue 4 exposed out of the packaging bag 6 to obtain the soft-package lithium ion battery cell.
Further, the method for removing the tab glue 4 with a part exposed out of the packaging bag 6 is laser cleaning. The technical parameters of the laser cleaning can be set according to the length of the exposed tab glue 41 actually removed.
The soft package lithium ion battery cell that makes in this embodiment, the length that the utmost point ear of finally exposing wrapping bag 6 glued 4 shortens, and utmost point ear 2 after cleaing away utmost point ear glue 4 can directly be connected with PACK protection shield 5 in the PACK process to reduce the length of battery behind the PACK, saved the space.
Further, the thickness T1 of the exposed tab glue 41 is smaller than the thickness T2 of the encapsulated tab glue 42. The thickness T2 of the tab glue 42 is the same as the thickness of the conventional tab glue 4 in this embodiment, the packaging effect of the tab glue 4 and the packaging bag 6 is ensured when the tab glue 42 is melted, and the thickness T1 of the exposed tab glue 41 is smaller than the thickness T2 of the tab glue 42, so that the total mass of the melted exposed tab glue 41 is reduced, and the subsequent removal of the redundant exposed tab glue 41 is facilitated.
Further, the length L of the exposed tab glue 41 is 0.2-2 mm. The length L of the exposed tab glue 41 cannot be too small, and the too small results in poor packaging effect of the tab 2 and the packaging bag 6, and liquid leakage and other adverse effects are easy to occur at the tab 2. The length L of the exposed tab glue 41 cannot be too long, which may result in an increase in the length of the battery after PACK.
Furthermore, the thickness T1 of the exposed tab glue 41 is 0.01-0.05 mm. It should be noted that the thickness of the tab glue 41 exposed on one side of the tab 2 is referred to herein. The thickness T1 of the exposed tab glue 41 cannot be too small, and the thickness T1 of the exposed tab glue 41 is too small to be sufficiently melted with the PP layer of the packaging bag 6 during hot pressing, which may reduce the packaging effect. The thickness T1 of the exposed tab glue 41 must not be too thick, which would cause the excess tab glue 4 to be inconvenient to clean during subsequent PACK welding of the protection plate 5.
Further, utmost point ear body 3 is including the first utmost point ear 31, second utmost point ear 32 and the third utmost point ear 33 that connect gradually, and first utmost point ear 31 exposes wrapping bag 6 outward, and second utmost point ear 32 is glued 4 by utmost point and is covered, and third utmost point ear 33 sets up the inside at electric core body 1.
Further, a width W1 of first pole ear 31 is greater than a width W2 of second pole ear 32. When single electric core is the lamination electricity core, because all there is a utmost point ear 2 on every utmost point piece, a plurality of utmost point ears 2 of lamination electricity core need strict alignment when the welding, just can weld a plurality of utmost point ear 2, and sets up the width W1 of first utmost point ear 31 to be greater than the width W2 of second utmost point ear 32, and when a plurality of utmost point ears 2 of single electric core welded, utmost point ear 2 need not strict alignment also can have good welding effect. For a winding type multi-lug 2 electric core, a plurality of lugs 2 can be welded without strict alignment, the welding difficulty is reduced, and the yield of the welding procedure is improved.
Further, the width W2 of the second pole ear 32 is equal to the width W3 of the third pole ear 33.
Further, the second tab portion 32 includes a tab glue exposed tab portion 321 and a tab glue encapsulated tab portion 322 connected in sequence.
Further, the joint of the side edge of the exposed tab glue 41 and the battery cell body 1 is in a concave arc shape.
Example 2
As shown in fig. 5, the present embodiment provides a soft package lithium ion battery module, including a soft package lithium ion battery core and a protection board 5 prepared by the method in embodiment 1, where the soft package lithium ion battery core includes a bare cell and a packaging bag 6 for packaging the bare cell, the bare cell includes a cell body 1 and a tab 2, one end of the tab 2 is connected to the cell body 1, the other end of the tab 2 is exposed out of the packaging bag 6 and is connected to the protection board 5, and the tab glue 4 exposed out of the packaging bag 6 has the same length.
The preparation method of the soft package lithium ion battery module comprises the following steps: after the soft package lithium ion battery cell in embodiment 1 is prepared, the laser cleaning technology is used to wash away the excess exposed tab glue 41, which also includes the exposed tab glue 41 on the tab body 3, and then the protection plate 5 is welded at one end of the tabs 2.
In the soft package lithium ion battery module provided by this embodiment, after the exposed tab glue 41 is cleaned by laser, the length consistency of the exposed tab glue 41 of the plurality of battery cells is better, and the length consistency of the finished battery is also improved.
Example 3
As shown in fig. 6, this embodiment provides a soft-package lithium ion battery cell, which is different from embodiment 1 in that a joint between a side edge of an exposed tab glue 41 and a battery cell body 1 is a concave arc.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 1
The comparative example provides a soft-package lithium ion battery cell, which is different from example 1 in that the thickness T1 of the exposed tab glue 41 is the same as the thickness T2 of the packaged tab glue 42.
Comparative example 2
As shown in fig. 7, the present comparative example provides a soft-package lithium ion battery module, which is manufactured from the soft-package lithium ion battery obtained in comparative example 1, and is different from example 2 in that the length L of the exposed tab glue 41 is inconsistent and is not subjected to laser cleaning, so that the overall length of the battery module is higher than that of the battery module in example 2.
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 (9)
1. The preparation method of the soft package lithium ion battery cell is characterized by comprising the following operations:
s1, placing the bare cell in a packaging bag, and exposing the packaging bag outside a tab glue part connected with a tab of the bare cell;
and S2, packaging the packaging bag, removing part of the tab glue exposed out of the packaging bag, and obtaining the soft package lithium ion battery cell.
2. The method for preparing the soft package lithium ion battery cell according to claim 1, wherein the method for removing the tab glue partially exposed out of the package bag comprises any one of laser cleaning, scraping and solvent cleaning.
3. The method for preparing the soft package lithium ion battery cell according to claim 1, wherein the bare cell comprises a cell body and the tab, one end of the tab is connected with the cell body, the other end of the tab is exposed out of the cell body, the tab comprises a tab body and tab glue covering part of the tab body, the tab glue comprises exposed tab glue and encapsulated tab glue which are connected with each other, the exposed tab glue is exposed out of the packaging bag, and the encapsulated tab glue is encapsulated in the packaging bag.
4. The method for preparing the soft package lithium ion battery cell according to claim 3, wherein the thickness of the exposed tab glue is smaller than that of the package tab glue.
5. The preparation method of the soft package lithium ion battery cell according to claim 3, wherein the length of the exposed tab glue is 0.2-2 mm.
6. The preparation method of the soft package lithium ion battery cell according to claim 3, wherein the thickness of the exposed tab glue is 0.01-0.05 mm.
7. The manufacturing method of the soft package lithium ion battery cell of claim 3, wherein the tab body comprises a first tab portion, a second tab portion and a third tab portion which are sequentially connected, the first tab portion is exposed out of the packaging bag, the second tab portion is covered by the tab glue, and the third tab portion is arranged inside the battery cell body.
8. The soft package lithium ion battery cell is characterized by being prepared by the preparation method of the soft package lithium ion battery cell according to any one of claims 1 to 7.
9. A soft package lithium ion battery module is characterized by comprising a plurality of soft package lithium ion battery cells of claim 8, wherein the lengths of the tab glue exposed out of the packaging bag are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010588079.XA CN111916833A (en) | 2020-06-24 | 2020-06-24 | Preparation method of soft package lithium ion battery cell, battery cell and battery module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010588079.XA CN111916833A (en) | 2020-06-24 | 2020-06-24 | Preparation method of soft package lithium ion battery cell, battery cell and battery module |
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| CN111916833A true CN111916833A (en) | 2020-11-10 |
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| CN202010588079.XA Pending CN111916833A (en) | 2020-06-24 | 2020-06-24 | Preparation method of soft package lithium ion battery cell, battery cell and battery module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115464268A (en) * | 2022-08-04 | 2022-12-13 | 南京科耐激光技术有限公司 | Process and device for cleaning tab sealant by laser based on power density adjustment |
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Application publication date: 20201110 |