CN218887435U - Top cap assembly and secondary battery including the same - Google Patents
Top cap assembly and secondary battery including the same Download PDFInfo
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- CN218887435U CN218887435U CN202223103447.0U CN202223103447U CN218887435U CN 218887435 U CN218887435 U CN 218887435U CN 202223103447 U CN202223103447 U CN 202223103447U CN 218887435 U CN218887435 U CN 218887435U
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- cap assembly
- welding
- secondary battery
- cover plate
- plastic ring
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a top cap subassembly and contain secondary battery of this top cap subassembly, top cap subassembly includes: the cover plate comprises a cover plate body, wherein a pole is arranged on the cover plate body; the adapter plate is arranged on the bottom surface of the cover plate body and welded with the pole to form a welding seal; go up the plastic ring, go up the plastic ring cover and locate outside the utmost point post, and be located the top surface of apron body, just including the solution face on the ring body of going up the plastic ring, wherein, the orientation of solution face set up into with there is the contained angle between the seal welding. The utility model discloses an orientation of the face that fuses on the plastic ring is gone up in the adjustment, it has the contained angle to form when making it and switching piece and utmost point post welding between the seal to go up the bulging force that plastic face that fuses regional received when reducing laser welding, and then reduce the regional stress of plastic face that fuses, ensure that it does not receive too big tensile force and fracture in welding process, thereby reach good guard action.
Description
Technical Field
The utility model belongs to the technical field of secondary battery, concretely relates to top cap subassembly and contain secondary battery of this top cap subassembly.
Background
With the continuous development of new energy fields, the demand of the market for the secondary battery of the automobile is gradually increased. The main bottleneck restricting the production of the new energy battery cell lies in the battery cell process. How to perfect the processing technology of each part of the battery cell and improve the yield rate in the production and manufacturing process of the battery cell is always a key link in the field of secondary batteries. The welding is a critical link which easily causes defects in the manufacturing process of the cell, and particularly for the square-shell cell, a plurality of welding procedures such as adapter plate welding, top cover welding and the like can be performed in the production and manufacturing process of the square-shell cell. The welding methods used in different processes are different, but can be basically divided into two categories, ultrasonic welding and laser welding. Laser welding is widely used in various fields of battery manufacturing due to high welding power, high speed, and small welding stress and deformation.
Then, in the laser welding process, because the welding part is directly contacted with some plastic parts, adhesive tapes, copper aluminum foils and the like, the temperature of a mechanical part is increased during the laser welding, the temperature rise of the plastic parts is low, the thermal expansion deformation between the plastic parts is inconsistent, and the thermal expansion deformation of the mechanical part is far greater than that of the plastic parts, so that the plastic parts bear large tensile force, and the unrecoverable damage or direct cracking is generated.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a top cap assembly and a secondary battery comprising the same, so as to improve the temperature rise of the mechanical part during laser welding, the temperature rise of the plastic part is low, the thermal expansion deformation between the two is inconsistent, the thermal expansion deformation of the mechanical part is much greater than that of the plastic part, the plastic part is caused to bear large tensile force, and the unrecoverable damage or direct cracking problem is generated.
To achieve the above and other related objects, the present invention provides a top cap assembly for a secondary battery, including: the cover plate comprises a cover plate body, wherein a pole is arranged on the cover plate body; the adapter plate is arranged on the bottom surface of the cover plate body and welded with the pole to form a welding seal; and the upper plastic ring is sleeved outside the pole and positioned on the top surface of the cover plate body, and the ring body of the upper plastic ring comprises a fusion surface, wherein an included angle exists between the fusion surface and the welding seal.
In an embodiment of the present invention, the fusing surface is formed by fusing the cut-outs on the ring body together, and the range of the included angle between the fusing surface and the welding mark is set between 45 ° and 90 °.
In an embodiment of the present invention, an included angle range between the fusion surface and the welding mark is set between 75 ° and 90 °.
In an embodiment of the invention, the width range of the solder print is set between 1mm and 2 mm.
In an embodiment of the present invention, a vertical distance range between the fusion surface and the solder mark is set between 6mm and 8 mm.
In an embodiment of the present invention, the length range of the fusing surface is set between 3mm and 5 mm.
In an embodiment of the invention, the length range of the solder mark is set between 20mm and 30 mm.
In an embodiment of the present invention, a ratio range between the length of the fusion surface and the length of the solder mark is set between 0.1 and 0.25.
The utility model also provides a secondary battery, include:
the top of the shell is provided with an opening;
the battery cell is placed in the shell and provided with a lug;
the top cover assembly of any one of the above embodiments, wherein the top cover assembly covers the opening and is fixedly connected to the housing, and the adapter plate on the bottom surface of the top cover assembly is connected to the tab.
The utility model provides a top cap subassembly and contain this top cap subassembly's secondary battery, through the orientation of plastic ring upward fusion face in the adjustment, it has the contained angle to form when making it and switching piece and utmost point post welding to weld between the seal, go up the expansive force that plastic fusion face region received when reducing laser welding, and then reduce the regional stress of plastic fusion face, ensure that it does not receive too big tensile force and fracture in welding process, thereby reach good guard action.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an exploded schematic view of a secondary battery according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a top cover assembly according to an embodiment of the present invention.
Fig. 3 is a partial side view of a top cap assembly in accordance with an embodiment of the present invention.
Fig. 4 is a schematic structural view of an upper plastic ring in a top cover assembly according to an embodiment of the present invention.
Fig. 5 is a schematic view of a fusion surface and a solder print of the top cap assembly according to an embodiment of the present invention.
Description of reference numerals:
a secondary battery 100; a housing 10; an electric core 20; a tab 201; a cap assembly 30; a cover body 31; an interposer 32; an upper plastic ring 33; the pole 34; a first weld 321; a second weld 322; welding seal 323; a fusing surface 331; the post body 341; an aluminum block 342; an opening 101.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can be implemented or applied by other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the present invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are for clarity of description, and are not intended to limit the scope of the invention, but rather the scope of the invention.
Please refer to fig. 1, the utility model provides a top cap subassembly and contain secondary battery of this top cap subassembly, through the orientation of the face of fusing on the adjustment plastic ring, it has the contained angle to form between the welding seal when making it and switching piece and utmost point post welding, in order to solve because the temperature rise of mechanical part when laser welding, the working of plastics temperature rise is low, thermal expansion deformation nonconformity between the two, the thermal expansion deformation of mechanical part is far greater than the working of plastics, lead to the working of plastics to bear great tensile force, produce the problem of unrecoverable damage or direct fracture.
Referring to fig. 1 and fig. 2, in the present embodiment, the secondary battery 100 includes a casing 10, a battery cell 20, and a cap assembly 30, wherein the battery cell 20 is installed in the casing 10, the cap assembly 30 covers the top of the casing 10 and is fixedly connected to the casing 10, and an adaptor sheet 32 at the bottom of the cap assembly 30 is connected to a tab 201 of the battery cell 20. Specifically, an opening 101 is disposed at the top of the casing 10, the battery cell 20 is installed in the casing 10, a tab 201 is disposed at the top of the battery cell 20, the top cap assembly 30 is installed at the top of the casing 10 and covers the opening 101, the top cap assembly 30 is fixedly connected to the casing 10, and a second welding portion 322 in the interposer 32 at the bottom of the top cap assembly 30 is welded to the tab 201 of the battery cell 20, so as to electrically connect the terminal 34 to the battery cell 20.
Referring to fig. 1 to 5, in the present embodiment, the cap assembly 30 is located on the top of the casing 10 in the secondary battery 100, so as to enclose the battery cell 20 in the casing 10. In this embodiment, the top cap assembly 30 includes a cover plate body 31, an adaptor sheet 32 and an upper plastic ring 33, wherein a terminal post 34 is installed on the cover plate body 31, specifically, a mounting hole is formed in the cover plate body 341, the terminal post 34 is installed in the mounting hole, the upper plastic ring 33 is sleeved outside the terminal post 34, the upper plastic ring 33 is fixed to the top of the cover plate body 31, the adaptor sheet 32 is located on the bottom surface of the cover plate body 31, and the adaptor sheet 32 is connected to the bottom surface of the terminal post 34, that is, the cover plate assembly 30 connects the terminal post 34 to the tab 201 of the battery cell 20 through the adaptor sheet 32.
Referring to fig. 2, 3 and 5, in the present embodiment, the interposer 32 includes a first welding portion 321 and a second welding portion 322, the first welding portion 321 is used to connect with a bottom surface of the post 34, the second welding portion 322 is used to connect with the tab 201 of the battery cell 20, specifically, in the present embodiment, the post 34 includes a post body 341 and an aluminum block 342, the aluminum block 341 and the post body 341 are fixed together, the post body 341 passes through the mounting hole from the bottom of the cover plate body 31, the aluminum block 342 is located at the bottom of the cover plate body 31, the first welding portion 321 of the interposer 32 is connected with the aluminum block 342 by welding to form a welding stamp 323, and the welding stamp 323 is located on the first welding portion 321.
Referring to fig. 2, 3 and 4, in the present embodiment, the upper plastic ring 33 is an annular structure, which is sleeved outside the pole post 34, a fusing surface 331 is formed on a ring body of the upper plastic ring 33, and specifically, the fusing surface 331 is a fusing surface formed by fusing together the cuts on the ring body of the upper plastic ring 33.
Referring to fig. 2 to 5, it should be noted that, since the temperature of the mechanical part rises during the laser welding, and the upper plastic ring 33 is a plastic part, the temperature rise is low, so that the thermal expansion deformation between the mechanical part and the upper plastic ring 33 is inconsistent, and the thermal expansion deformation of the mechanical part is much larger than that of the plastic part, which easily causes the problem that the upper plastic ring 33 outside the post 34 bears a large stretching force when the adaptor tab 32 and the post 34 are welded together, so that the fusion surface 331 is damaged irreversibly or cracked directly. It should be noted that the included angle is an included angle α between the orthogonal projection of the fusion surface 331 and the soldering stamp 323 when on the interposer 32, and it should be noted that the included angle α refers to a smaller included angle in the included angles formed between the fusion surface 331 and the soldering stamp 323.
Referring to fig. 2 to 5, in the present embodiment, an included angle α between the orientation of the fusing surface 331 and the welding seal 323 ranges from 1 ° to 90 °, and is preferably set to range from 45 ° to 90 °, such as 45 °, 60 °, 90 °. In some other embodiments, the angle α between the orientation of the bonding surface 331 and the weld mark 323 can be set between 75 ° and 90 ° to ensure that the upper plastic bonding surface region does not crack under too much tensile force during laser welding.
Referring to fig. 2 to 5, in the present embodiment, when the interposer 32 is welded to the post 34, a width of the welding mark 323 formed thereon is set to be, for example, 1mm to 2mm, and in the present embodiment, is preferably 1.5mm, so as to avoid a problem that a welding stress and deformation are easily generated due to a too wide welding seam and a large welding heat affected zone, and a stress concentration is caused due to a too narrow welding seam.
Referring to fig. 2 to 5, in the present embodiment, the vertical distance L between the fusing surface 331 and the welding mark 323 is set between 6mm and 8mm, preferably 7mm and 7.2mm, so as to prevent the fusing surface 331 from being affected by too high temperature during welding due to too close distance between the fusing surface 331 and the welding mark 323, and thus the upper plastic ring 33 is melted or damaged due to overheating.
Referring to fig. 2 to 5, in the present embodiment, the length of the fusing surface 331 is set to be between 3mm and 5mm, preferably 4mm, and the length of the solder mark 323 is set to be between 20mm and 30mm, preferably 20mm. It should be noted that, in this embodiment, a ratio between the length of the fusing surface 331 and the length of the solder mark 323 is set to be 0.1 to 0.25, preferably 0.15, 0.25, so as to avoid the upper plastic fused surface area from being damaged by too much stretching or too high temperature while ensuring the welding quality.
The utility model provides a secondary battery and top cap subassembly thereof, through the orientation of plastic ring going up the face of solution in the adjustment, it has the contained angle to form when making it and switching piece and utmost point post welding between the welding seal to go up the bulging force that plastic solution face region received when reducing laser welding, and then reduce the regional stress of plastic solution face, ensure that it does not receive too big tensile force and fracture in welding process, thereby reach good guard action.
The above description is only a preferred embodiment of the present application and the explanation of the technical principle used, and it should be understood by those skilled in the art that the scope of the present application is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above technical features (but not limited to) having similar functions disclosed in the present application. The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention.
Besides the technical features described in the specification, other technical features are known to those skilled in the art, and further description of the other technical features is omitted here in order to highlight the innovative features of the present invention.
Claims (9)
1. A cap assembly of a secondary battery, comprising:
the cover plate comprises a cover plate body, wherein a pole is arranged on the cover plate body;
the adapter plate is arranged on the bottom surface of the cover plate body, and the adapter plate is welded with the pole to form a welding seal;
go up the plastic ring, go up the plastic ring cover and locate outside the utmost point post, and be located the top surface of apron body, just including the solution face on the ring body of going up the plastic ring, wherein, the orientation of solution face set up into with there is the contained angle between the seal welding.
2. The cap assembly of the secondary battery according to claim 1, wherein the fusion surface is formed by fusing the cuts of the ring body together, and the orientation of the fusion surface is set to be within an angle range of 45 ° to 90 ° with respect to the solder mark.
3. The cap assembly of the secondary battery according to claim 1, wherein an angle between the orientation of the fusion-bonding surface and the solder mark is set to range from 75 ° to 90 °.
4. The cap assembly of the secondary battery according to claim 1, wherein the width of the solder mark is set to range between 1mm and 2 mm.
5. The cap assembly of the secondary battery according to claim 1, wherein a vertical distance between the fusing surface and the solder stamp is set to range from 6mm to 8 mm.
6. The cap assembly of the secondary battery according to claim 1, wherein the length of the fusing surface is set to range between 3mm and 5 mm.
7. The cap assembly of the secondary battery according to claim 1, wherein the length of the weld is set to range between 20mm and 30 mm.
8. The cap assembly of the secondary battery according to claim 1, wherein a ratio between a length of the fusing surface and a length of the solder mark ranges from 0.1 to 0.25.
9. A secondary battery, characterized by comprising:
the top of the shell is provided with an opening;
the battery cell is placed in the shell and provided with a lug;
the cap assembly of any one of claims 1 to 8, wherein the cap assembly covers the opening and is fixedly connected to the housing, and the adaptor plate on the bottom surface of the cap assembly is connected to the tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223103447.0U CN218887435U (en) | 2022-11-22 | 2022-11-22 | Top cap assembly and secondary battery including the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223103447.0U CN218887435U (en) | 2022-11-22 | 2022-11-22 | Top cap assembly and secondary battery including the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218887435U true CN218887435U (en) | 2023-04-18 |
Family
ID=85940044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223103447.0U Active CN218887435U (en) | 2022-11-22 | 2022-11-22 | Top cap assembly and secondary battery including the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218887435U (en) |
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2022
- 2022-11-22 CN CN202223103447.0U patent/CN218887435U/en active Active
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