CN217306613U - Mylar membrane structure and lithium battery - Google Patents
Mylar membrane structure and lithium battery Download PDFInfo
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- CN217306613U CN217306613U CN202221113848.1U CN202221113848U CN217306613U CN 217306613 U CN217306613 U CN 217306613U CN 202221113848 U CN202221113848 U CN 202221113848U CN 217306613 U CN217306613 U CN 217306613U
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- 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 utility model provides a Mylar membrane structure and lithium cell belongs to lithium ion battery technical field, include: the film body comprises a bottom surface coating film, a large surface coating film and a side surface coating film, and the film body is suitable for coating the outer surface of the battery cell; the battery cell comprises a battery cell body, a film body and a sticking structure, wherein the battery cell body is provided with a side face and a side face, the side face of the film body faces the battery cell, the other side of the sticking structure is suitable for being stuck with the outer surface of the battery cell, and the sticking structure is arranged on the bottom face coating film, the large face coating film and the side face coating film. The utility model provides a pair of Mylar membrane structure utilizes to paste the structure and pastes the lamina membranacea on the surface of electric core to make the lamina membranacea cladding on the bottom surface of electric core, big face and side, consequently, need not to use hot melt process to connect the lamina membranacea and electric core, avoided the production of welding fried point, guaranteed the production quality of battery, and paste the mode simply, improve production efficiency.
Description
Technical Field
The utility model relates to a lithium ion battery technical field, concretely relates to Mylar membrane structure and lithium cell.
Background
Lithium batteries are used as power sources of new energy automobiles, and lithium battery technology is rapidly developed in recent years. At present, a square battery is the most common lithium ion battery structure. In the manufacturing process of the square lithium battery, after the battery core is manufactured, the battery core needs to be arranged in a hard square aluminum shell to complete assembly. There is a risk of scratching the cell due to the aluminum casing being harder. Therefore, before the battery cell is installed in the aluminum casing, the battery cell needs to be covered by a flexible Mylar film to prevent the aluminum casing from damaging the battery cell. In the prior art, a Mylar film is usually wrapped on the surface of a battery core in a hot melting mode, however, the hot melting process is complex, drawn wires are easily generated in the hot melting process, the drawn wires are clamped into a welding line when a top cover is welded, welding explosion points are caused, and the quality of a battery is affected.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the adoption hot melt technology among the prior art and wrapping up the Mylar membrane at electric core surface, the technology is complicated to influence the defect of battery quality, thereby provide a Mylar membrane structure and lithium cell.
In order to solve the above problem, the utility model provides a Mylar membrane structure, include: the film body comprises a bottom surface coating film, a large surface coating film and a side surface coating film, and the film body is suitable for coating the outer surface of the battery cell; the battery cell comprises a battery cell body, a film body and a sticking structure, wherein the battery cell body is provided with a side face and a side face, the side face of the film body faces the battery cell, the other side of the sticking structure is suitable for being stuck with the outer surface of the battery cell, and the sticking structure is arranged on the bottom face coating film, the large face coating film and the side face coating film.
The bottom edges of the two large-surface coating films are respectively connected with the two long edges of the bottom surface coating film, and the side surface coating film is connected to the short edge of the bottom surface coating film and/or the side edge of the large-surface coating film.
The side surface coating film comprises a bottom surface side film and a large surface side film, the bottom surface side film is provided with two films which are connected to two short edges of the bottom surface coating film, each large surface coating film is provided with two large surface side films, and the two large surface side films are respectively connected to two side edges of the large surface coating film.
And each bottom surface side membrane is disconnected from two adjacent large surface side membranes.
The adhesive structure comprises a first adhesive body and a second adhesive body, the first adhesive body is simultaneously adhered to the bottom surface coating film and the at least one bottom surface side sub-film, and the second adhesive body is simultaneously adhered to the large surface coating film and the at least one large surface side sub-film.
The first colloid is provided with two sections, the two sections of the first colloid are respectively close to two short edges of the bottom surface coating film, and each section of the first colloid is simultaneously bonded on the bottom surface coating film and one bottom surface side split film.
The second colloid is simultaneously bonded on the large-surface covering film and the two large-surface side split films.
The second colloid is the rectangular structure that extends the setting, the second colloid set up in the big face coating film is kept away from one side of bottom surface coating film.
The membrane body is of a rectangular structure.
The pasting structure is double-sided adhesive tape.
The utility model also provides a lithium cell, including electric core and cladding in foretell Mylar membrane structure on the electric core surface.
The utility model has the advantages of it is following:
1. the utility model provides a pair of Mylar membrane structure utilizes to paste the structure and pastes the lamina membranacea on the surface of electric core to make the lamina membranacea cladding on the bottom surface of electric core, big face and side, consequently, need not to use hot melt process to connect the lamina membranacea and electric core, avoided the production of welding fried point, guaranteed the production quality of battery, and paste the mode simply, improve production efficiency.
2. The utility model provides a pair of Mylar membrane structure divides the membrane with every bottom surface side and divides the disconnection between the membrane rather than two adjacent big faces side, and every bottom surface side of being convenient for divides the membrane and every big face side divides the membrane to attach respectively on the side of electric core, guarantees bottom surface side and divides the membrane and the attached roughness of big face side branch membrane.
3. The utility model provides a pair of Mylar membrane structure bonds first colloid in bottom surface coating film and at least one bottom surface side simultaneously and divides the membrane, bonds the second colloid in big face coating film and at least one big face side simultaneously and divides the membrane, the setting of the first colloid of being convenient for and second colloid.
4. The utility model provides a pair of Mylar membrane structure sets up first colloid into two shorter sections of gluing, and two sections of gluing are close to two minor faces settings of bottom surface coating film respectively, when having guaranteed that bottom surface coating film and bottom surface side divide the membrane homoenergetic to bond with electric core surface, have reduced the quantity of pasting the structure.
5. The utility model provides a pair of Mylar membrane structure sets up the second colloid into rectangular structure to when big bread tectorial membrane cladding is on the big face of electric core, the second colloid is located the upside of big face, consequently, utilizes the second colloid of rectangular shape can be with the stable bonding of big face cladding membrane on electric core, has reduced the quantity of pasting the structure.
6. The utility model provides a pair of Mylar membrane structure sets up the membrane body into the rectangle structure, and the shape of membrane body is simple, the processing of the membrane body of being convenient for.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a Mylar membrane structure provided in embodiment 1 of the present invention;
fig. 2 shows a schematic structural diagram of a lithium battery provided in embodiment 2 of the present invention.
Description of reference numerals:
10. a membrane body; 11. the bottom surface is coated with a film; 12. coating a film on the large surface; 13. coating a film on the side surface; 131. bottom side film separation; 132. film separation is carried out on the large-area side; 20. a pasting structure; 21. a first colloid; 22. and (4) a second colloid.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 according to specific situations by those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
One embodiment of the Mylar film structure shown in fig. 1, comprises: a membrane body 10 and an adhesive structure 20. The film body 10 comprises a bottom surface coating film 11, a big bread coating film 12 and a side surface coating film 13, and the film body 10 is suitable for coating the outer surface of the battery core. One surface of the pasting structure 20 is pasted on one surface of the film body 10 facing the battery cell, the other surface of the pasting structure 20 can be pasted with the outer surface of the battery cell, and the pasting structures 20 are arranged on the bottom surface coating film 11, the big bread coating film 12 and the side surface coating film 13.
Utilize pasting structure 20 to paste the film body 10 on the surface of electric core to make film body 10 cladding on the bottom surface of electric core, big face and side, consequently, need not to use hot melt technology to connect film body 10 and electric core, avoided the production of welding fried point, guaranteed the production quality of battery, and paste the mode simply, improve production efficiency.
It should be noted that, referring to fig. 2, the battery cell is generally a flat rectangular parallelepiped structure, and in a vertical state, a plane formed in a length direction and a width direction of the battery cell is a bottom surface of the battery cell, a plane formed in the length direction and the height direction of the battery cell is a large surface of the battery cell, and a plane formed in the width direction and the height direction of the battery cell is a side surface of the battery cell.
In the present embodiment, as shown in fig. 1, two large-surface coating films 12 are provided, the bottom edges of the two large-surface coating films 12 are connected to the two long edges of the bottom surface coating film 11, respectively, and the side surface coating films 13 are connected to the short edges of the bottom surface coating film 11 and the side edges of the large-surface coating film 12.
It should be noted that the two large-bread coating films 12 are respectively disposed on two sides of the bottom-surface coating film 11, the bottom edge of the large-bread coating film 12 is the edge of the large-bread coating film 12 along the length direction of the battery cell, and correspondingly, the long edge of the bottom-surface coating film 11 is the edge of the bottom-surface coating film 11 along the length direction of the battery cell. The short side of the bottom surface coating film 11 is the side of the bottom surface coating film 11 along the width direction of the battery cell, and the side of the large surface coating film 12 is the side of the large surface coating film 12 along the height direction of the battery cell.
Further, both the bottom cover film 11 and the large bread cover film 12 may be provided with a side cover film 13 in a connected manner, or one of them may be connected with a side cover film 13. Two short edges of the bottom surface coating film 11 can be connected with side surface coating films 13, and one short edge can be connected with the side surface coating film 13; for any one of the two large bread coating films 12, the side coating film 13 may be connected to both side edges of each large bread coating film 12, or the side coating film 13 may be connected to one side edge thereof.
In the present embodiment, as shown in fig. 1, the side cover film 13 includes a bottom surface side divided film 131 and a large surface side divided film 132. The two bottom-surface-side split films 131 are provided, and the two bottom-surface-side split films 131 are connected to the two short sides of the bottom-surface cover film 11, respectively. Two large-side membranes 132 are provided on each large-bread coating film 12, and the two large-side membranes 132 are connected to both side edges of the large-bread coating film 12, respectively.
It is to be noted that, as shown in fig. 1, the bottom-surface side split films 131 are provided on both the left and right sides of the bottom-surface covering film 11; for both large-side cover films 12, the large-side split film 132 is provided on both the left and right sides of each large-side cover film 12.
As shown in fig. 1, each bottom surface side division film 131 is provided to be disconnected from two large surface side division films 132 adjacent thereto.
It should be noted that, as shown in fig. 1, one large-area-side sub-film 132 (i.e., the large-area-side sub-film 132 adjacent to the bottom-area-side sub-film 131) is respectively disposed above and below each bottom-area-side sub-film 131, and the bottom-area-side sub-film 131 and the two large-area-side sub-films 132 are in a disconnected state, so, referring to fig. 2, when the bottom-area-side sub-film 131 and the large-area-side sub-films 132 are folded, no drag is generated between the bottom-area-side sub-film 131 and the large-area-side sub-films 132, which is convenient for each bottom-area-side sub-film 131 and each large-area-side sub-film 132 to be respectively attached to the side surface of the battery cell, and ensures the flatness of the bottom-area-side sub-films 131 and the large-area-film 132.
As shown in fig. 1, the attaching structure 20 includes a first glue body 21 and a second glue body 22, the first glue body 21 is simultaneously adhered to the bottom cover film 11 and the at least one bottom side partial film 131, and the second glue body 22 is simultaneously adhered to the large side cover film 12 and the at least one large side partial film 132. Therefore, the continuous first colloid 21 is arranged on the bottom surface coating film 11 and the bottom surface side parting film 131, and the continuous second colloid 22 is arranged on the large-area coating film 12 and the large-area side parting film 132, so that the glue sections are prevented from being respectively arranged on the bottom surface coating film 11, the bottom surface side parting film 131, the large-area coating film 12 and the large-area side parting film 132, and the arrangement of the first colloid 21 and the second colloid 22 is more convenient.
Specifically, as shown in fig. 1, the first colloid 21 is provided with two sections, the two sections of the first colloid 21 are respectively arranged near two short sides of the bottom surface coating film 11, and each section of the first colloid 21 is simultaneously adhered to the bottom surface coating film 11 and one bottom surface side sub-film 131.
It should be noted that, as shown in fig. 1, two pieces of the first glue 21 are respectively disposed on the left and right sides of the bottom-surface coating film 11, the first glue 21 on the left side is adhered to the left side of the bottom-surface coating film 11 and the bottom-surface-side partial film 131 on the left side, and the first glue 21 on the right side is adhered to the right side of the bottom-surface coating film 11 and the bottom-surface-side partial film 131 on the right side. On the bottom surface coating film 11, two sections of the first colloid 21 are arranged at intervals, that is, the part between the two sections of the first colloid 21 is not provided with a colloid section.
Set up first colloid 21 into two shorter sections of gluing, two sections of gluing are close to two minor faces settings of bottom surface coating film 11 respectively, have reduced the quantity of pasting structure 20 when having guaranteed that bottom surface coating film 11 and bottom surface side divide membrane 131 homoenergetic and electric core surface to bond.
Of course, according to specific use requirements, a glue section may be disposed between the two first glue bodies 21, or a glue section may be disposed at other positions of the bottom cover film 11 and the bottom side split film 131.
In the present embodiment, as shown in fig. 1, the second colloid 22 is simultaneously adhered to the large-side coating film 12 and the two large-side split films 132. Specifically, as shown in fig. 1, the second glue body 22 is an elongated structure extending therefrom, and the second glue body 22 is disposed on a side of the large bread coating film 12 away from the bottom surface coating film 11.
Set up second colloid 22 into rectangular structure to when big bread tectorial membrane 12 cladding is on the big face of electric core, second colloid 22 is located the upside of big face, consequently, utilizes the second colloid 22 of rectangular shape can be with the stable bonding of big face cladding membrane 12 on electric core, has reduced the quantity of pasting structure 20.
In the present embodiment, as shown in fig. 1, the film body 10 has a rectangular structure, and the shape of the film body 10 is simple, which facilitates processing of the film body 10.
In this embodiment, the attaching structure 20 is a double-sided tape.
Of course, the pasting structure 20 may also be glue coated on the film body 10, and only two sides of the pasting structure 20 may be used for pasting.
Example 2
As shown in fig. 2, a specific embodiment of a lithium battery includes a battery core and the Mylar film structure of example 1, where the Mylar film structure is coated on an outer surface of the battery core. Specifically, the bottom surface coating film 11 is bonded to the bottom surface of the battery cell, the two large-area coating films 12 are bonded to the two large surfaces of the battery cell respectively, and the side surface coating film 13 is bonded to the side surface of the battery cell.
It should be noted that, referring to fig. 2, a surface of the cell in fig. 2 above is actually a bottom surface of the cell.
As shown in fig. 2, the bottom surface side division film 131 is provided to cover the outside of the large surface side division film 132. When the bottom surface side partial film 131 and the large surface side partial film 132 are bonded to the side surface of the battery cell, the large surface side partial film 132 is folded and bonded to the side surface, and then the bottom surface side partial film 131 is folded and bonded to the large surface side partial film 132. Since the first colloid 21 is provided on the bottom-surface-side film 131, the bottom-surface-side film 131 can be provided outside the large-surface-side film 132 and can be further bonded and fixed by the first colloid 21.
As shown in fig. 2, two large-area-side separators 132 located on the same side surface of the cell are provided at intervals. After the side of rolling over the back and bonding in electric core is rolled over to big face side and is divided membrane 132, can bond two big face sides and divide membrane 132 on same side, there is certain clearance between these two big face sides divide the membrane 132, consequently, can reduce the consumptive material of membrane body 10 to reduce cost, and, do not have the overlap between two big face sides divide the membrane 132, the income shell of the electric core of being more convenient for.
When the Mylar film structure of embodiment 1 is adhered to an electrical core, first, the electrical core is positioned by a circular fixture; then, a film absorbing mechanical arm absorbs the Mylar film structure through a sucker, the film absorbing mechanical arm drives the Mylar film structure to move to the position above the battery core, and the film absorbing mechanical arm carries out film coating through an attached cylinder connecting rod mechanism; and finally, the battery cell moves to the next station through the circulating clamp, and the side surface smoothing is completed through the smoothing mechanism.
According to the above description, the present patent application has the following advantages:
1. the film body and the battery cell are bonded by the double faced adhesive tape, so that wire drawing caused by a hot melting process and explosion points caused by welding of a top cover are avoided, and the problem of high reject ratio of the battery cell is solved;
2. the double-sided adhesive tape is adopted, so that the cost is low, and the problem of material consumption of the hot-melt hair heater is solved;
3. and a whole film body is adopted for coating, so that the film body is prevented from being adhered to each surface of the battery cell independently, and the coating process is simplified.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (11)
1. A Mylar film structure, comprising:
the film body (10) comprises a bottom surface coating film (11), a large surface coating film (12) and a side surface coating film (13), and the film body (10) is suitable for coating the outer surface of the battery cell;
the battery cell structure comprises a pasting structure (20), wherein one surface of the pasting structure (20) is pasted on one surface, facing the battery cell, of the film body (10), the other surface of the pasting structure (20) is suitable for being adhered to the outer surface of the battery cell, and the pasting structure (20) is arranged on the bottom surface coating film (11), the large surface coating film (12) and the side surface coating film (13).
2. Mylar (r) film structure according to claim 1, characterized in that there are two large-side cover films (12), the bottom edges of the two large-side cover films (12) are connected with the two long edges of the bottom cover film (11), respectively, and the side cover films (13) are connected at the short edges of the bottom cover film (11) and/or at the side edges of the large-side cover film (12).
3. Mylar (r) film structure according to claim 2, characterized in that the side cover film (13) comprises a bottom side cover film (131) and a large side cover film (132), the bottom side cover film (131) is provided with two and connected to two short sides of the bottom cover film (11), two large side cover films (132) are provided on each large cover film (12), and the two large side cover films (132) are connected to two sides of the large cover film (12), respectively.
4. Mylar membrane structure according to claim 3, wherein a break is provided between each of the base side membranes (131) and the two large side membranes (132) adjacent thereto.
5. Mylar membrane structure according to claim 3 or 4, wherein the affixing structure (20) comprises a first glue (21) and a second glue (22), the first glue (21) adhering to both the bottom cover film (11) and the at least one bottom side sub-film (131), and the second glue (22) adhering to both the large side cover film (12) and the at least one large side sub-film (132).
6. The Mylar membrane structure of claim 5, wherein the first glue (21) is provided in two sections, the two sections of the first glue (21) are respectively disposed near two short sides of the bottom cover membrane (11), and each section of the first glue (21) is simultaneously bonded to the bottom cover membrane (11) and one bottom side sub-membrane (131).
7. The Mylar film structure of claim 5, wherein the second glue (22) is bonded to both the large side cover film (12) and both of the large side sub-films (132).
8. The Mylar membrane structure of claim 7, wherein the second gel (22) is an elongated structure extending therefrom, the second gel (22) being disposed on a side of the large-side cover membrane (12) away from the bottom-side cover membrane (11).
9. Mylar membrane structure according to any of claims 1-4, wherein the membrane body (10) is of rectangular configuration.
10. Mylar film structure according to any of claims 1-4, wherein the adhesive means (20) is a double sided tape.
11. A lithium battery comprising a cell and the Mylar (r) film structure of any of claims 1-10 coated on an outer surface of the cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221113848.1U CN217306613U (en) | 2022-05-10 | 2022-05-10 | Mylar membrane structure and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221113848.1U CN217306613U (en) | 2022-05-10 | 2022-05-10 | Mylar membrane structure and lithium battery |
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| Publication Number | Publication Date |
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| CN217306613U true CN217306613U (en) | 2022-08-26 |
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| CN202221113848.1U Active CN217306613U (en) | 2022-05-10 | 2022-05-10 | Mylar membrane structure and lithium battery |
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| CN (1) | CN217306613U (en) |
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- 2022-05-10 CN CN202221113848.1U patent/CN217306613U/en active Active
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