CN219696570U - Top cap and top cap welding set - Google Patents
Top cap and top cap welding set Download PDFInfo
- Publication number
- CN219696570U CN219696570U CN202321176901.7U CN202321176901U CN219696570U CN 219696570 U CN219696570 U CN 219696570U CN 202321176901 U CN202321176901 U CN 202321176901U CN 219696570 U CN219696570 U CN 219696570U
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- Prior art keywords
- top cover
- laser
- insulator
- welding
- polyester
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- 238000003466 welding Methods 0.000 title claims abstract description 48
- 239000012212 insulator Substances 0.000 claims abstract description 31
- 229920006267 polyester film Polymers 0.000 claims abstract description 28
- 229920000728 polyester Polymers 0.000 claims description 25
- 239000004065 semiconductor Substances 0.000 claims description 9
- 239000003351 stiffener Substances 0.000 claims 1
- 229920002799 BoPET Polymers 0.000 abstract description 12
- 239000005041 Mylar™ Substances 0.000 abstract description 12
- 239000012528 membrane Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 11
- 210000004027 cell Anatomy 0.000 description 10
- 230000003014 reinforcing effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a top cover and a top cover welding device, wherein the top cover comprises a top cover main body and an insulating piece connected with the top cover main body; the side surface of the insulating piece provides a welding position for the polyester film, and the height of the side surface of the insulating piece is larger than or equal to the minimum size of the laser light spot, so that the side surface of the insulating piece can completely contain the laser light spot. The insulator side provides the welding position for Mylar membrane, through the minimum size with the high more than or equal to laser facula of insulator side to make the insulator side can hold the laser facula completely, and use laser to weld polyester film on the side of insulator fully, so set up can reduce the height of insulator, thereby reduce the holistic proportion of top cap occupy the battery, thereby promote the energy density of battery.
Description
Technical Field
The utility model relates to the technical field of battery welding, in particular to a top cover and a top cover welding device.
Background
In the production process of the battery, polyester films such as Mylar films need to be coated on the outer side of the battery core, so that the effect of protection and insulation is achieved, the closing-in of the Mylar films coated on the battery core needs to be welded to the top cover, so that the Mylar films are stably coated on the outer side of the battery core, when the Mylar films are welded to an insulating piece of the top cover, a pulse heat melting point welding mode is adopted in the prior art, an insulation boss for providing a welding position is arranged on the top cover, and due to the limitation of the size and the specification of a heat melting head, the position height of the top cover provided with the insulation boss is higher, so that the top cover occupies a large proportion of the whole battery, and the energy density of the battery is reduced.
Disclosure of Invention
In view of this, the present utility model provides a top cover. The utility model also provides a top cover welding device for welding the top cover and the polyester film.
The utility model provides the following technical scheme:
a top cover comprises a top cover main body and an insulating piece connected with the top cover main body; the side surface of the insulating piece provides a welding position for the polyester film, and the height of the side surface of the insulating piece is larger than or equal to the minimum size of the laser spot, so that the side surface of the insulating piece can completely contain the laser spot.
Preferably, the height of the side surface of the insulating member is 1mm or more.
Preferably, the height of the side surface of the insulating member is 3mm or less.
Preferably, a thinning area is arranged in the middle of the insulating piece.
Preferably, a plurality of thinning areas are provided, and reinforcing members are provided between adjacent thinning areas.
A cap welding device comprising a laser, wherein the laser is used for welding the polyester film and the cap according to any one of the above.
Preferably, the laser is a semiconductor laser.
Preferably, the insulating member has an annular welding surface extending in a circumferential direction, the polyester-based film is welded to each part of the annular welding surface, and an area of the annular welding surface is 4mm2 or more.
Preferably, the top cover welding device further comprises an identification component for identifying the profile of the side surface of the insulating member covered by the Mylar film.
The top cover provided by the utility model comprises a top cover main body and an insulating piece connected with the top cover main body; the side surface of the insulating piece provides a welding position for the polyester film, and the height of the side surface of the insulating piece is larger than or equal to the minimum size of the laser light spot, so that the side surface of the insulating piece can completely contain the laser light spot, and the thickness of the insulating piece can be as small as possible. The insulator side provides the welding position for Mylar membrane, through the minimum size with the high more than or equal to laser facula of insulator side to make the insulator side can hold the laser facula completely, and use laser to weld polyester film full-weld in succession on the side of insulator, make insulator and Mylar membrane stable connection, so set up can reduce the height of insulator as far as possible under the prerequisite that does not influence top cap and Mylar membrane connection stability, thereby reduce the holistic proportion of top cap occupy the battery, thereby promote the energy density of battery.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a three-dimensional view of a top cover in the present embodiment;
FIG. 2 is a front view of the top cover;
FIG. 3 is a side view of the top cover;
FIG. 4 is a top view of the top cover;
FIG. 5 is an enlarged view of FIG. 4A;
fig. 6 is a front view of the battery cell after the polyester-based film is welded to the top cover;
FIG. 7 is a side view of the cell after the polyester-based film is welded to the top cap;
fig. 8 is a top view of the cell after the polyester-based film is welded to the cap.
In the figure: 1. a top cover main body; 2. an insulating member; 21. thinning the area; 22. a reinforcing member; 3. polyester-based films.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1 to 8, the embodiment of the present utility model provides a top cover, which includes a top cover main body 1 and an insulating member 2 connected to the top cover main body 1; wherein, the side of the insulating part 2 provides a welding position for the polyester film 3, and the height of the side of the insulating part 2 is larger than or equal to the minimum size of the laser spot, so that the side of the insulating part 2 can completely accommodate the laser spot.
Specifically, in the production process of the battery, the polyester film 3 needs to be coated on the outer side of the battery cell, and then the closing-in of the polyester film 3 is welded on the insulating piece 2 of the top cover, so that the polyester film 3 realizes the coating of the battery cell, and the effects of insulating the battery cell from the outside and protecting the battery cell are achieved.
As a preferred embodiment, the heights of the respective positions of the side surfaces of the insulator 2 are the same, and the polyester-based film 3 is fully welded to the side surfaces of the insulator 2, which means that the polyester-based film 3 is fully welded to the circumferential side surfaces of the insulator 2, so that the height of the insulator 2 can be reduced.
The height of the side surface of the insulator 2 refers to the dimension in the direction indicated by the arrow B in fig. 5.
The minimum size of the laser spot is the diameter of the circle when the laser spot is circular; when the laser light spot is rectangular, the minimum size of the laser light spot is the size of the wide side of the rectangle; when the laser spot is in a special-shaped structure, the minimum size of the laser spot refers to the maximum size of the laser spot in the height direction of the side surface of the insulating member 2 when the side surface of the insulating member 2 can completely accommodate the laser spot.
The polyester film 3 is a film that covers the outside of the battery cell to insulate the battery cell from the outside and protect the battery cell, and is generally referred to as a Mylar film.
The top cover with the structure comprises a top cover main body 1 and an insulating piece 2 connected with the top cover main body 1; wherein, the side of the insulating part 2 provides a welding position for the polyester film 3, and the height of the side of the insulating part 2 is larger than or equal to the minimum size of the laser spot, so that the side of the insulating part 2 can completely accommodate the laser spot. And use laser to weld polyester film 3 on the side of insulating part in succession, so set up can furthest reduce the height of insulating part 2 to reduce the top cap height and the proportion that the top cap accounts for the whole battery, promote the energy density of battery.
In some embodiments, the height of the sides of the insulator 2 is 1mm or more.
When the polyester film 3 and the top cover are welded by a laser, the laser has a circular shape with an output spot diameter of 1mm to 3mm, and the height of the side surface of the insulator 2 is set to 1mm or more.
Specifically, the diameter of the output light spot of the laser can be 1mm, 2mm and 3mm, the heights of the corresponding side surfaces of the insulating piece 2 are 1mm, 2mm, 3mm, 3.5mm and 4mm, and the heights of the side surfaces of the insulating piece 2 are more than or equal to the sizes of the laser light spots.
Here, when the diameter of the output light spot of the laser is 1mm, the preferred height of the side surface of the insulating member 2 is also set to 1mm, and the set height of the side surface of the insulating member 2 is reduced, so that the proportion of the body part of the battery core to the battery can be improved, and the energy density of the battery can be improved.
Under the above arrangement, the polyester film 3 is preferably fully welded to the annular side surface of the insulating member 2 continuously by using a laser, and the polyester film 3 is fully welded to the side surface of the insulating member 2, so that the stability of the connection between the polyester film 3 and the side surface of the insulating member 2 is improved on the premise of ensuring the energy density of the battery.
In some preferred embodiments, the height of the side of the insulator 2 is 1mm or more and 3mm or less.
Specifically, also when using the laser to weld Mylar film and top cap, under the circular condition that the diameter of the output facula of laser is 1mm-3mm, set up the height of insulating part 2 side to be greater than 1mm on the basis, further, be less than 3mm with the height of insulating part 2 side, and guarantee the height of insulating part 2 side to be greater than or equal to the diameter of laser output facula, so that insulating part 2 side can hold the facula that the laser shines on insulating part 2 side completely.
Further, since the laser has a circular shape with an output spot diameter of 1mm to 3mm, the height of the side surface of the insulating member 2 is also 1mm to 3mm, and as a preferred embodiment, the height of the side surface of the insulating member 2 is equal to the diameter of the laser spot. For example, the laser output spot diameter and the height of the side of the insulator 2 are each 1mm, 2mm or 3mm.
Here, the height of the side surface of the insulating member 2 is equal to the minimum size of the laser spot, and thus, the area occupied by the cell body portion can be increased on the basis of ensuring that the welding spot of the laser is completely irradiated to the side surface of the insulating member 2, thereby increasing the energy density of the battery.
In some embodiments, the middle of the insulator 2 is provided with a thinned region 21.
Specifically, the thinning area 21 is arranged in the middle of one face of the insulating part 2, which faces away from the top cover main body 1, and the thinning area 21 is not arranged in the circumferential annular side surface area (namely, the welding area) of the insulating part 2, so that the side surface height of the insulating part 2 is unchanged, the situation that the polyester film 3 is welded to the side surface of the insulating part 2 by using a laser can be guaranteed, full welding can be realized, and the side surface of the insulating part 2 can completely contain laser spots is ensured.
The middle portion of the insulator 2 refers to an inner region of the circumferential side surface of the insulator 2.
Here, the material of insulating part 2 is PP material or PPS material, through setting up thinning district 21 at the middle part of insulating part 2, can reduce the quantity of using of insulating part 2 material in the in-process of producing insulating part 2, reduce the cost. The thinned area 21 is to obtain a lightweight cover plate, further reducing the cost and weight of the cover plate. Furthermore, the insulation part 2 is provided with the thinning holes, so that the use amount of the material of the insulation part 2 can be further reduced, and the cost is further reduced.
In some embodiments, the thinning out regions 21 are provided in plurality, and the reinforcing members 22 are provided between adjacent thinning out regions 21. The reinforcement 2 is preferably arranged in the region of the filling opening of the cover plate and in the region of the explosion-proof valve.
Specifically, a plurality of thinning areas 21 may be provided, and the plurality of thinning areas 21 are symmetrically provided along a center line in a length direction of the insulating member 2, so that the stress balance of the insulating member 2 can be ensured.
The reinforcing member 22 is preferably made of the same material as the insulating member 2, for example: PP or PPs.
It is known that the larger the area occupied by the thinning area 21 is, the more the material of the insulating member 2 is used in the process of processing the insulating member 2, but when the thinning area 21 is larger, the overall stability of the insulating member 2 is poor, and the forming effect of the welded polyester film is poor, so that the reinforcing member 22 is arranged between the adjacent thinning areas 21, the reinforcing member 22 and the side wall of the insulating member 2 are matched to form a frame structure, and the overall structural strength of the insulating member 2 is improved on the premise of reducing the material consumption of the insulating member 2.
The shape of the reinforcing member 22 is not limited, and the reinforcing member 22 may have a rectangular parallelepiped, square, tubular structure, or the like.
A cap welding device comprises a laser, wherein the laser emitted from the laser is used for welding a polyester film 3 and the cap.
The laser here refers specifically to a continuous or pulse laser with a wavelength in the range of 200-11000nm, and the laser can be a semiconductor laser, a solid-state laser, or a fiber laser.
In some embodiments, the laser is a semiconductor laser.
Preferably, a semiconductor laser with a wave band from ultraviolet to blue light is adopted, the wavelength range is 300nm-600nm, and the output power is 5W-500W. The output light spot size of the semiconductor laser is 10-3000 μm, and the light spot is round, bar-shaped or irregularly-shaped.
When a semiconductor laser is used for the heat-fusible bottom sheet and the polyester-based film 3, it is preferable that the semiconductor laser has a wavelength range of 300nm to 500nm, an output power of 20 to 200W, and a laser irradiation time of 0.7s to 1.5s. Further, the semiconductor laser welding power output power was 20W.
In some embodiments, the side surface of the insulating member 2 has an annular welding surface extending in the circumferential direction, and the polyester-based film 3 is welded to each part of the annular welding surface, and the area of the annular welding surface is 4mm2 or more.
Specifically, the side surface of the insulating member 2 has an annular welding surface extending in the circumferential direction, and the polyester-based film 3 is welded to each part of the annular welding surface, which means that the polyester-based film 3 is continuously fully welded to the side surface of the insulating member 2, and the polyester-based film 3 is welded to the circumferential side surface of the insulating member 2.
Here, the side surface of the insulator 2 has an annular welding surface extending in the circumferential direction, and the polyester film 3 is welded to each part of the annular welding surface, so that the polyester film 3 can be more tightly connected to the side surface of the insulator 2, and the connection stability is better. On the basis, the area of the annular welding surface is ensured to be more than or equal to 4mm < 2 >, so that the stability of the connection between the polyester film 3 and the side surface of the insulating part 2 is ensured on the premise of improving the energy density of the battery, and the tensile resistance between the welded Mylar film and the side surface of the insulating part 2 is ensured to be more than or equal to 100N. The annular continuous full welding can reduce the height of the insulating part, improve the energy density of the battery and ensure the welding stability.
In some embodiments, the top cover welding apparatus further comprises an identification component for identifying the profile of the side of the insulating member 2 covered by the polyester-based film 3.
Specifically, it is necessary to weld the overlapping position of the polyester-based film 3 and the side surface of the insulator 2, and although the polyester-based film 3 is a translucent film, the overlapping position of the base sheet and the polyester-based film 3 cannot be recognized quickly and accurately, and by providing a recognition unit (not shown in the figure) capable of recognizing the outline of the side surface of the insulator 2 covered with the polyester-based film 3, the overlapping position of the polyester-based film 3 and the side surface of the insulator 2 can be recognized quickly.
Here, the recognition module recognizes the overlapping position of the polyester-based film 3 and the side surface of the insulating member 2 by color difference or transparency, and as a preferred embodiment, color difference exists between the polyester-based film 3 and the side surface of the insulating member 2, so that the recognition module can rapidly recognize the overlapping region of the polyester-based film 3 and the base sheet.
As an alternative embodiment, the insulating member is black, and the material is PP material or PPs material.
The identification component can be shooting equipment such as a camera, and the like, and can identify the color difference between the overlapping area of the polyester film 3 and the side surface of the insulating piece 2 and other areas; the identification component can also be a spotlight, and the transparency of the overlapping area of the polyester film 3 and the side surface of the insulating piece 2 and other areas can be identified; thereby realizing recognition of the profile of the side of the insulating member 2 covered with the polyester-based film 3.
In addition, please refer to the description of the top cover for other beneficial effects brought by the top cover welding device, and the description is omitted herein.
The basic principles of the present utility model have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present utility model are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present utility model. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the utility model is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present utility model are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present utility model, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present utility model.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present utility model is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present utility model are used for more clearly describing the technical solutions, and are not intended to limit the scope of the present utility model.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the utility model to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (9)
1. The top cover is characterized by comprising a top cover main body and an insulating piece connected with the top cover main body; the side surface of the insulating piece provides a welding position for the polyester film, and the height of the side surface of the insulating piece is larger than or equal to the minimum size of the laser spot, so that the side surface of the insulating piece can completely contain the laser spot.
2. The top cover according to claim 1, wherein the height of the insulating member side face is 1mm or more.
3. The header according to claim 2, wherein the height of the insulator side is 3mm or less.
4. The header as recited in claim 1, wherein a thinned region is provided in a middle portion of the insulator.
5. The overcap of claim 4, wherein a plurality of the thinned regions are provided and a stiffener is provided between adjacent thinned regions.
6. The top cover according to claim 1, wherein the insulating member has an annular welding surface extending in a circumferential direction, the polyester-based film is welded to each part of the annular welding surface, and an area of the annular welding surface is 4mm2 or more.
7. A cap welding apparatus comprising a laser for welding the polyester-based film and the cap according to any one of claims 1 to 6.
8. The header welding device of claim 7, wherein the laser is a semiconductor laser.
9. The header welding device of claim 7, further comprising an identification assembly for identifying a profile of a side of the insulator covered by the polyester-based film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321176901.7U CN219696570U (en) | 2023-05-16 | 2023-05-16 | Top cap and top cap welding set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321176901.7U CN219696570U (en) | 2023-05-16 | 2023-05-16 | Top cap and top cap welding set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219696570U true CN219696570U (en) | 2023-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321176901.7U Active CN219696570U (en) | 2023-05-16 | 2023-05-16 | Top cap and top cap welding set |
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| Country | Link |
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| CN (1) | CN219696570U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117870564A (en) * | 2024-03-11 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Detection method and system for cell Mylar film |
-
2023
- 2023-05-16 CN CN202321176901.7U patent/CN219696570U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117870564A (en) * | 2024-03-11 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Detection method and system for cell Mylar film |
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