CN112968218A - Method for enhancing package reliability of top and bottom seals of soft package battery - Google Patents
Method for enhancing package reliability of top and bottom seals of soft package battery Download PDFInfo
- Publication number
- CN112968218A CN112968218A CN202110335803.2A CN202110335803A CN112968218A CN 112968218 A CN112968218 A CN 112968218A CN 202110335803 A CN202110335803 A CN 202110335803A CN 112968218 A CN112968218 A CN 112968218A
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- China
- Prior art keywords
- packaging
- aluminum
- tab
- battery cell
- insulating film
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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
-
- 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 provides a method for enhancing the packaging reliability of a top-bottom seal of a soft package battery, which is characterized in that an electrode core lug is packaged through an upper seal head and a lower seal head of packaging equipment, and a sealing area 1A, a sealing area 1B and a hollow area 1C are formed through primary top-bottom seal packaging and secondary top-bottom seal packaging. The invention can reach the purpose of compensating the PP sol overflow of the outer non-sealed area, reducing the false sealing or liquid leakage phenomenon in the packaging process and enhancing the packaging reliability of the pole ear when packaging the pole ear side of the battery, and has stronger matching property of packaging process parameters.
Description
Technical Field
The invention belongs to the field of battery tab packaging, and particularly relates to a method for enhancing the packaging reliability of a top-bottom seal of a soft package battery.
Background
At present, the sealing area on the pole ear side of the soft package lithium ion battery comprises an aluminum plastic film packaging area, an insulating film shoulder width area (referred to as a 'slot position seal') and an overlapping area of a pole ear metal sheet and an insulating film. When carrying out top end sealing encapsulation, on putting the encapsulation base with the electric core that the parcel has the plastic-aluminum membrane, electric core utmost point ear part stretches between the head, hot pressing plastic-aluminum membrane carries out once effective encapsulation under certain pressure and temperature, the plastic-aluminum membrane is formed by outmost nylon layer, middle aluminium lamination and inside PP layer complex, the encapsulation is in order effectively to encapsulate electric core to plastic-aluminum membrane inlayer PP layer hot melt promptly, in addition, prior art method also has and accomplishes the back at the encapsulation, carries out secondary hot pressing to the encapsulation position and reaches the purpose of reinforcing encapsulation.
The existing packaging secondary hot-pressing treatment method has high requirements on pressure and time of secondary hot pressing, and leakage caused by excessively thin PP sol due to over-sealing of an aluminum plastic film can be caused. And when the effective heat sealing is carried out once, a certain amount of PP sol inevitably overflows, false sealing and even leakage can occur when the packaging pressure and the packaging temperature are low, however, when the packaging pressure and the packaging temperature are high, the PP sol overflows too much, and the problem of unreliable packaging exists when the PP sol is seriously lost.
Disclosure of Invention
In view of the above, the present invention is directed to a method for enhancing the top-bottom seal packaging reliability of a soft package battery, which overcomes the defects of the conventional one-time effective heat sealing, performs two-time packaging on a tab of the soft package battery, and forms a hollow region between two sections of top-bottom seals, so as to achieve the purposes of compensating for PP sol overflow and enhancing packaging firmness.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for enhancing the packaging reliability of a top and bottom seal of a soft package battery comprises the following steps:
s1, preparing a battery cell to be packaged;
s2, punching a pit on the aluminum plastic film; taking two aluminum-plastic films, and respectively carrying out pit punching operation on the two aluminum-plastic films; after the punching of the aluminum-plastic film is finished, placing the battery cell into the aluminum-plastic film subjected to punching, so that the battery cell is wrapped by the two aluminum-plastic films; after that, the battery core wrapped by the aluminum plastic film is placed on packaging equipment to prepare for packaging operation;
s3, packaging the top and bottom seals for the first time; placing the battery cell on a limiting tool of packaging equipment for positioning, enabling a battery cell lug to be positioned between an upper seal head and a lower seal head of the limiting tool, starting a manual control device, further moving the upper seal head downwards, closing the upper seal head and the lower seal head, and carrying out hot melting on two layers of aluminum-plastic films and an insulating film on the battery cell lug under the set packaging pressure and packaging temperature of the upper seal head and the lower seal head; a seal area formed by the first top and bottom sealing is used as 1A;
s4, packaging the top and bottom seals for the second time; performing secondary top-bottom sealing packaging on the battery cell tab subjected to the primary top-bottom sealing packaging through the step in S2, reserving a space with the width of 1-2 mm between the primary top-bottom sealing packaging and the secondary top-bottom sealing packaging, and taking a sealing area formed by the secondary top-bottom sealing packaging as 1B; the region formed between 1A and 1B serves as a hollow region 1C;
and S5, after the set packaging time is reached, automatically lifting the upper end enclosure, taking out the battery cell, and completing top and bottom sealing and packaging of the battery cell tab.
Furthermore, the upper end enclosure and the lower end enclosure which are fixedly arranged on the packaging equipment are both provided with heating devices for heating, the heating temperature range of the upper end enclosure and the lower end enclosure is 170-180 ℃, the packaging pressure of the upper end enclosure and the lower end enclosure is 0.2-0.4 mpa, and the packaging time is 2-5 s.
Furthermore, the tab is formed by compounding an insulating film and a metal sheet, the tab comprises a positive tab and a negative tab, the metal sheet of the positive tab is made of Al, and the metal sheet of the negative tab is made of Cu/Ni material; the width of the insulating film is larger than that of the metal sheet, the positions of two sides of the insulating film, which are wider than the metal sheet, are called as the shoulder width of the insulating film, and the shoulder width of the insulating film and the structure formed after the aluminum plastic film is subjected to hot melting are used as slot marks.
Further, the sum of the widths of the seal region 1A, the seal region 1B and the hollow region 1C is smaller than the width of the insulating film of the tab.
Compared with the prior art, the method for enhancing the top and bottom seal packaging reliability of the soft package battery has the following advantages:
(1) the method for enhancing the top-bottom seal packaging reliability of the soft package battery can achieve the purposes of compensating the overflow of PP sol in an outer unsealed area, reducing the false sealing or liquid leakage phenomenon in packaging and enhancing the packaging reliability at the tab when the battery tab side is packaged, and has strong packaging process parameter matching property.
(2) The method for enhancing the top-bottom sealing packaging reliability of the soft-package battery is suitable for the special hard sealing process of the industry and is suitable for soft-package batteries with lugs at one side and soft-package batteries with lugs at two ends.
(3) According to the method for enhancing the top-bottom sealing packaging reliability of the soft package battery, disclosed by the invention, the pole ear of the battery is effectively packaged by changing the top-bottom sealing packaging method without changing the structural design of the traditional end socket, so that poor fusion of hot melt adhesive or pole ear crush caused by the depth of a sealing groove is avoided.
(4) According to the method for enhancing the packaging reliability of the top and bottom seals of the soft package battery, two sides of the seal are packaged for two times, so that a hollow area with a certain gap is reserved in the middle of the top and bottom seals, the method is simple and reliable, the seal is relatively narrowed, the effect of uniform sol thickness is facilitated, and the method is matched with corresponding packaging equipment.
(5) According to the method for enhancing the packaging reliability of the top and bottom seals of the soft package battery, the PP sol overflows from the middle part of the seal only by changing the top and bottom seal packaging method after two times of packaging, so that the effect of compensating the accumulation of the PP sol in the outer unsealed area and the inner unsealed area is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram illustrating an operation of a top-bottom package according to an embodiment of the invention;
fig. 2 is a schematic diagram illustrating a tab packaging effect according to an embodiment of the present invention.
Description of reference numerals:
1. an aluminum-plastic film; 2. a tab; 3. and (6) groove printing.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
1. A method for enhancing the packaging reliability of a top and bottom seal of a soft package battery comprises the following steps:
s1, preparing a battery cell to be packaged; the dimension specification of the battery core tab 2 is provided according to the operation requirement, wherein the dimension specification of one tab 2 is taken as an example, the width of an insulating film of the tab 2 is 57mm, the width of a metal sheet of the tab 2 is 50mm, the shoulder width of the insulating film is 3.5mm, the length of the tab 2 is 35.5mm,
s2, punching a pit on the aluminum plastic film 1; taking two aluminum-plastic films 1, and respectively carrying out pit punching operation on the two aluminum-plastic films 1; after the punching of the aluminum-plastic film 1 is finished, placing the battery cell into the aluminum-plastic film 1 after the punching is finished, and enabling the two aluminum-plastic films 1 to wrap the battery cell; after that, the battery core wrapped by the aluminum-plastic film 1 is placed on packaging equipment to prepare for packaging operation;
s3, packaging the top and bottom seals for the first time; placing a battery cell on a limiting tool of packaging equipment for positioning, enabling a battery cell lug 2 to be located between an upper seal head and a lower seal head of the limiting tool, starting a manual control device, further moving the upper seal head downwards, closing the upper seal head and the lower seal head, and carrying out hot melting on two layers of aluminum-plastic films 1 and an insulating film on the battery cell lug 2 under the set packaging pressure and packaging temperature of the upper seal head and the lower seal head; a seal area formed by the first top and bottom sealing is used as 1A;
s4, packaging the top and bottom seals for the second time; performing secondary top-bottom sealing packaging on the battery core tab 2 subjected to the primary top-bottom sealing packaging through the step in S2, reserving a space with the width of 1-2 mm between the primary top-bottom sealing packaging and the secondary top-bottom sealing packaging, and taking a sealing area formed by the secondary top-bottom sealing packaging as 1B; the region formed between 1A and 1B serves as a hollow region 1C;
and S5, after the set packaging time is reached, automatically lifting the upper end enclosure, taking out the battery cell, and completing top and bottom sealing and packaging of the battery cell tab 2.
The package of the positive tab of the battery is called a top seal, the package of the negative tab of the battery is called a bottom seal,
the widths of the sealing area 1A and the sealing area 1B depend on the widths of the upper seal head and the lower seal head, the method is suitable for the packaging equipment of the lugs 2 with different specifications and models,
the upper end enclosure and the lower end enclosure which are fixedly arranged on the packaging equipment are both provided with heating devices for heating, the heating temperature range of the upper end enclosure and the lower end enclosure is 170-180 ℃, the packaging pressure of the upper end enclosure and the lower end enclosure is 0.2-0.4 mpa, and the packaging time is 2-5 s.
The tab 2 is formed by compounding an insulating film and a metal sheet, the tab 2 comprises a positive tab and a negative tab, the metal sheet of the positive tab is made of Al, and the metal sheet of the negative tab is made of Cu/Ni material; the width of the insulating film is larger than that of the metal sheet, the positions of two sides of the insulating film, which are wider than the metal sheet, are called as the shoulder width of the insulating film, and the shoulder width of the insulating film and the structure formed after the aluminum plastic film 1 is subjected to hot melting are used as the groove position mark 3.
The sum of the widths of the sealing area 1A, the sealing area 1B and the hollow area 1C is smaller than the width of the insulating rubber sheet of the tab 2, so as to ensure that the insulating rubber sheet is left with exposed and exposed margins.
When packaging is carried out, the seal heads of the battery with the lugs 2 at one side are positioned at the same side, and the lugs 2 are placed between the upper seal head and the lower seal head for packaging; and the end sockets of the positive electrode lug and the negative electrode lug of the battery with the electrode lugs 2 at the two sides are respectively provided with an end socket.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for enhancing the packaging reliability of a top and bottom seal of a soft package battery comprises the following steps:
s1, preparing a battery cell to be packaged;
s2, punching a pit on the aluminum plastic film; taking two aluminum-plastic films, and respectively carrying out pit punching operation on the two aluminum-plastic films; after the punching of the aluminum-plastic film is finished, placing the battery cell into the aluminum-plastic film subjected to punching, so that the battery cell is wrapped by the two aluminum-plastic films; after that, the battery core wrapped by the aluminum plastic film is placed on packaging equipment to prepare for packaging operation;
s3, packaging the top and bottom seals for the first time; placing the battery cell on a limiting tool of packaging equipment for positioning, enabling a battery cell lug to be positioned between an upper seal head and a lower seal head of the limiting tool, starting a manual control device, further moving the upper seal head downwards, closing the upper seal head and the lower seal head, and carrying out hot melting on two layers of aluminum-plastic films and an insulating film on the battery cell lug under the set packaging pressure and packaging temperature of the upper seal head and the lower seal head; a seal area formed by the first top and bottom sealing is used as 1A;
s4, packaging the top and bottom seals for the second time; performing secondary top-bottom sealing packaging on the battery cell tab subjected to the primary top-bottom sealing packaging through the step in S2, reserving a space with the width of 1-2 mm between the primary top-bottom sealing packaging and the secondary top-bottom sealing packaging, and taking a sealing area formed by the secondary top-bottom sealing packaging as 1B; the region formed between 1A and 1B serves as a hollow region 1C;
and S5, after the set packaging time is reached, automatically lifting the upper end enclosure, taking out the battery cell, and completing top and bottom sealing and packaging of the battery cell tab.
2. The method for enhancing the reliability of the top and bottom seal package of the soft package battery according to claim 1, wherein: the upper end enclosure and the lower end enclosure which are fixedly arranged on the packaging equipment are both provided with heating devices for heating, the heating temperature range of the upper end enclosure and the lower end enclosure is 170-180 ℃, the packaging pressure of the upper end enclosure and the lower end enclosure is 0.2-0.4 mpa, and the packaging time is 2-5 s.
3. The method for enhancing the reliability of the top and bottom seal package of the soft package battery according to claim 1, wherein: the tab is formed by compounding an insulating film and a metal sheet, and comprises a positive tab and a negative tab, wherein the metal sheet of the positive tab is made of Al, and the metal sheet of the negative tab is made of Cu/Ni material; the width of the insulating film is larger than that of the metal sheet, the positions of two sides of the insulating film, which are wider than the metal sheet, are called as the shoulder width of the insulating film, and the shoulder width of the insulating film and the structure formed after the aluminum plastic film is subjected to hot melting are used as slot marks.
4. The method for enhancing the reliability of the top and bottom seal package of the soft package battery according to claim 1, wherein: the sum of the widths of the sealing area 1A, the sealing area 1B and the hollow area 1C is smaller than the width of the insulating film of the tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110335803.2A CN112968218A (en) | 2021-03-29 | 2021-03-29 | Method for enhancing package reliability of top and bottom seals of soft package battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110335803.2A CN112968218A (en) | 2021-03-29 | 2021-03-29 | Method for enhancing package reliability of top and bottom seals of soft package battery |
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| CN112968218A true CN112968218A (en) | 2021-06-15 |
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| CN202110335803.2A Pending CN112968218A (en) | 2021-03-29 | 2021-03-29 | Method for enhancing package reliability of top and bottom seals of soft package battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488732A (en) * | 2021-07-05 | 2021-10-08 | 天津市捷威动力工业有限公司 | Secondary packaging process for aluminum plastic film |
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| CN211700339U (en) * | 2020-03-25 | 2020-10-16 | 宁德新能源科技有限公司 | Packaging structure of battery core and battery with same |
| CN212783615U (en) * | 2020-09-09 | 2021-03-23 | 微宏动力系统（湖州）有限公司 | Tab for battery and battery |
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2021
- 2021-03-29 CN CN202110335803.2A patent/CN112968218A/en active Pending
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| US4649090A (en) * | 1986-01-22 | 1987-03-10 | Rayovac Corporation | Seal tab for a metal-air electrochemical cell |
| JP2000235850A (en) * | 1999-02-16 | 2000-08-29 | Hitachi Maxell Ltd | Layered polymer electrolyte battery |
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| CN113488732A (en) * | 2021-07-05 | 2021-10-08 | 天津市捷威动力工业有限公司 | Secondary packaging process for aluminum plastic film |
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