CN220400722U - Cylindrical battery sealing structure - Google Patents
Cylindrical battery sealing structure Download PDFInfo
- Publication number
- CN220400722U CN220400722U CN202321460771.XU CN202321460771U CN220400722U CN 220400722 U CN220400722 U CN 220400722U CN 202321460771 U CN202321460771 U CN 202321460771U CN 220400722 U CN220400722 U CN 220400722U
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- Prior art keywords
- section
- cover
- plate
- cylindrical battery
- sealing
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- 238000007789 sealing Methods 0.000 title claims abstract description 64
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 25
- 230000007704 transition Effects 0.000 abstract description 13
- 238000005096 rolling process Methods 0.000 abstract description 8
- 238000003466 welding Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model discloses a cylindrical battery sealing structure, which comprises a cylindrical shell and an end cover, wherein the cylindrical shell consists of a bottom plate and a shell side plate, the shell side plate is axially divided into a first section, a second section and a transition section, the outer circle diameter of the first section is larger than that of the second section, the first section is far away from the bottom plate, the end cover consists of a cover plate and a cover side plate, the cover side plate is sleeved on the outer side of the first section, the end part of the cover side plate far away from the cover plate is bent inwards in a circumferential direction to form a first bending part, the first bending part is attached to the outer side surface of the transition section, the cover plate is covered at the port of the cylindrical shell, and a first sealing ring is arranged between the end part of the first section far away from the second section and the cover plate. The sealing between the end cover and the cylinder shell is realized through the joint limit of the first bending part and the transition section and the first sealing ring, so that the sealing of the cylindrical battery is realized, the rolling groove or the laser welding operation is not needed, the utilization rate of the inner space of the cylindrical battery is high, and the structural strength and the performance are not influenced by the sealing process.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a cylindrical battery sealing structure.
Background
The current sealing mode of the cylindrical battery mainly comprises rolling groove squat sealing and laser welding sealing. The rolling groove squats and seals the rolling groove when assembling, presses and seals after liquid injection, and the rolling groove is required at the end part of the side wall of the cylindrical battery, so that the utilization rate of the inner space of the cylindrical battery structure is not high, and the structural strength of the cylindrical battery after the rolling groove can be influenced. The laser welding seal uses high energy density laser beam as heat source to heat the surface of structural member, and the structural member is melted by heat conduction and diffusion to form molten pool seal. The laser welding seal has high cost, and laser ash is easy to generate, which has influence on the battery performance.
Disclosure of Invention
The utility model aims to solve the technical problems of providing a sealing structure of a cylindrical battery, which has small influence on the structure and performance of the cylindrical battery, simple process and low cost.
In order to solve the technical problems, the utility model provides a cylindrical battery sealing structure, which comprises a cylindrical shell and an end cover, wherein the cylindrical shell is formed by a bottom plate and a shell side plate, the shell side plate is axially divided into a first section, a second section and a transition section, the outer circle diameter of the first section is larger than that of the second section, the first section is far away from the bottom plate, the end cover is formed by a cover plate and a cover side plate, the cover side plate is sleeved outside the first section, the end part of the cover side plate far away from the cover plate is bent inwards in a circumferential direction to form a first bending part, the first bending part is attached to the outer side surface of the transition section, the cover plate is covered at the port of the cylindrical shell, and a first sealing ring is arranged between the end part of the first section far away from the second section and the cover plate.
In the sealing structure of the cylindrical battery, the end cover is limited at the end part of the cylindrical shell along the axial direction of the cylindrical battery through the joint limit of the first bending part and the transition section, the cover plate is sealed on the opening end surface of the cylindrical shell, and the sealing between the end cover and the cylindrical shell is realized through the first sealing ring, so that the sealing of the cylindrical battery is realized, a rolling groove or laser welding operation is not needed, the utilization rate of the inner space of the cylindrical battery is high, and the structural strength and the performance are not influenced by the sealing process. And when sealing, only need place first sealing washer, cover the end cover on the shell, then bend at end cover tip edge and can realize sealing, simple process need not equipment input such as channelling machine, laser welding machine, with low costs.
Further, the inner side surface of the cover side plate is in interference nesting fit with the outer side surface of the first section. By adopting interference fit, the strength of the connecting structure of the end cover and the cylinder shell can be increased, so that the sealing structure is more stable, and the sealing performance of the sealing structure can be improved.
Further, the end part of the first section far away from the second section is bent inwards in a circumferential direction to form a second bent part, and the first sealing ring is arranged among the outer side surface of the second bent part, the inner side surface of the cover plate and the inner side surface of the cover side plate.
Because the wall thickness of the shell side plate is generally thinner, the first sealing ring is not easy to be directly arranged between the end edge and the inner side surface of the cover plate, otherwise, the first sealing ring is easy to damage, and the sealing performance is affected. Therefore, the first sealing ring is extruded along the axial direction of the cylindrical battery through the outer side surface of the second bending part and the inner side surface of the cover plate, so that sealing can be better realized, the structural design is ingenious, the diameter of the second bending part is smaller, and the second bending part has a guiding effect when the end cover is sleeved, so that the installation is easier.
Further, the second bending part is in a conical horn mouth shape.
Further, the outer side wall of the first section is smeared with structural adhesive. When the end cover is sleeved, the structural adhesive fills the gap between the first section and the cover side plate, and the structural adhesive is tightly connected with the first section and the cover side plate after solidification, so that the cylinder shell and the end cover are mutually fixed in the axial direction and the circumferential direction of the cylindrical battery, and the structural strength of the sealing structure is improved.
Further, the first bending part is in a conical horn mouth shape.
In summary, by adopting the sealing structure of the cylindrical battery, the rolling groove or laser welding operation is not needed, the utilization rate of the internal space of the cylindrical battery is high, the structural strength and the performance are not affected by the sealing process, and the process is simple and the cost is low.
Drawings
In the drawings:
fig. 1 is an overall structural view of a cylindrical battery sealing structure of the present utility model.
Fig. 2 is a view showing a constitution of a cartridge case of a sealing structure of a cylindrical battery of the present utility model.
Fig. 3 is a diagram showing the structure of an end cap structure of a cylindrical battery seal structure according to the present utility model.
Fig. 4 is an axial sectional view of the sealing structure of the cylindrical battery of the present utility model.
Fig. 5 is an enlarged view of a portion a in fig. 4.
Fig. 6 is a split structure diagram of an end cap of a cylindrical battery seal structure according to the present utility model.
Reference numerals illustrate: 1. a cartridge housing; 11. a bottom plate; 12. a shell side plate; 121. a first section; 122. a second section; 1211. a second bending part; 123. a transition section; 2. an end cap; 21. a cover plate; 22. a cover side plate; 221. a first bending part; 3. a first seal ring; 41. a rivet; 42. a tab block; 43. an insulating block; 44. an insulating pad holder; 45. a second seal ring; 46. a collecting tray; 47. an explosion-proof valve slot.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model.
Fig. 1-6 illustrate a cylindrical battery closure structure of the present utility model. As shown in fig. 1-5, the cylindrical battery sealing structure comprises a cylindrical structure comprising a cylindrical shell 1 and an end cover 2, wherein the cylindrical shell 1 is formed by a bottom plate 11 and a shell side plate 12, the shell side plate 12 is axially divided into a first section 121, a second section 122 and a transition section 123, the outer circle diameter of the first section 121 is larger than that of the second section 122, the first section 121 is far away from the bottom plate 11, the end cover 2 is formed by a cover plate 21 and a cover side plate 22, the cover side plate 22 is sleeved outside the first section 121, the end part of the cover side plate 22 far away from the cover plate 21 is bent inwards to form a first bending part 221 in a circle, the first bending part 221 is attached to the outer side surface of the transition section 123, the cover plate 21 is covered at the port of the cylindrical shell 1, and a first sealing ring 3 is arranged between the end part of the first section 121 far away from the second section 122 and the cover plate 21.
The outer diameter of the transition section 123 gradually changes, and gradually decreases from the outer diameter of the first section 121 to the outer diameter of the second section 122, so that a smooth transition from the first section 121 to the second section 122 is realized. By changing the diameter of the outer circle of the transition section 123, the end cover 2 is matched with the first bending part 221 to form a clamping structure, and the end cover 2 is prevented from being separated from the cylinder shell 1, so that a sealing structure is formed. In addition, the first bending part 221 is not formed before the end cap 2 is mounted on the cartridge case 1, and is formed by bending after the mounting is completed.
Optionally, the thickness of the first section 121 is twice the thickness of the second section 122. The first section 121 may be formed by folding out at the end of the shell side plate 12.
Optionally, the inner side of the cover side plate 22 is an interference nested fit with the outer side of the first section 121. The installation can be realized by adopting a press-fitting mode, and the interference is designed to be smaller and is about one tenth of the wall thickness because the wall thickness of the cover side plate 22 and the shell side plate 12 is thinner. The interference fit not only can increase the strength of the connecting structure between the end cover 2 and the cylinder shell 1 and make the sealing structure more stable, but also can improve the sealing performance of the sealing structure
Optionally, the end of the first section 121 away from the second section 122 is bent inward along a circumference to form a second bent portion 1211, and the first sealing ring 3 is disposed between the outer side surface of the second bent portion 1211, the inner side surface of the cover plate 21, and the inner side surface of the cover side plate 22.
Also, since the wall thickness of the shell side plate 12 is generally thin, the first seal ring 3 is not directly arranged between the end edge and the inner side surface of the cover plate 21, otherwise, the first seal ring 3 is easily damaged, and the sealing performance is affected. Therefore, the outer side surface of the second bending part 1211 and the inner side surface of the cover plate 21 squeeze the first sealing ring 3 along the axial direction of the cylindrical battery, so that sealing can be better realized, the structural design is ingenious, the diameter of the second bending part 1211 is smaller, and the second bending part has a guiding function when the end cover 2 is sleeved, so that installation is easier.
Optionally, the first sealing ring 3 is an O-ring.
Alternatively, the second bent portion 1211 has a tapered bell-mouth shape, so that the guiding effect is better and the installation is easier. In addition, after the winding core is put into the drum shell 1, the end of the first section 121 far from the second section 122 is bent inwards along a circumference to form a second bending part 1211, so that the influence on the size of the put winding core is avoided.
Optionally, the outer side wall of the first section 121 is coated with a structural adhesive, and the structural adhesive is fastened and connected after being solidified, so that the cartridge case 1 and the end cover 2 are mutually fixed in the axial direction and the circumferential direction of the cylindrical battery, and the structural strength of the sealing structure is improved.
Alternatively, the first bending portion 221 has a tapered flare shape.
Alternatively, as shown in fig. 6, the tab block 42, the insulating block 43, the insulating pad holder 44, the second seal ring 45, and the current collecting plate 46 are fixed to the cap plate 21 by rivets 41. The tab block 42, the insulating block 43, the cover plate 21, the insulating pad support 44, the second sealing ring 45 and the current collecting disc 46 are stacked from top to bottom and riveted by rivets 41, and the insulating block 43 insulates and separates the bottom surface of the tab block 42 from the top surface of the cover plate 21; the second sealing ring 45 has a T-shaped structure, separates the column body of the rivet 41 from the cover plate 21 in an insulating way, and seals the middle opening of the cover plate 21; rivet 41 electrically connects collector plate 46 and tab block 42; the insulating mat holder 44 is used to limit the internal winding core.
Optionally, the cover plate 21 is provided with an explosion-proof valve slot 47, which is opened to breathe when the internal pressure of the cylindrical battery is high, so as to prevent explosion accidents.
When in use, the lug block 42, the insulating block 43, the insulating pad bracket 44, the second sealing ring 45 and the current collecting disc 46 are fixedly arranged on the cover plate 21 through the rivet 41, and the first sealing ring 3 is put into the inner side surface of the cover plate 21; then the end cover 2 is integrally pressed onto the cartridge housing 1, so that the cover plate 21 covers the port of the cartridge housing 1; finally, the end part of the cover side plate 22 far away from the cover plate 21 is bent inwards in a circumferential direction to form a first bending part 221, and the first bending part 221 is attached to the outer side surface of the transition section 123, so that the whole end cover 2 is axially limited and fixed, and the first sealing ring 3 is extruded to seal a seal, thereby realizing the sealing operation.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the scope of protection thereof, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: various changes, modifications, or equivalents may be made to the particular embodiments of the utility model by those skilled in the art after reading the present disclosure, but such changes, modifications, or equivalents are within the scope of the utility model as defined in the appended claims.
Claims (8)
1. The utility model provides a cylinder battery seal structure, its characterized in that includes barrel casing (1) and end cover (2), barrel casing (1) comprises barrel structure by bottom plate (11) and shell curb plate (12), shell curb plate (12) divide into first section (121), second section (122) and changeover portion (123) triplex along the axial, the excircle diameter of first section (121) is greater than second section (122), just first section (121) are kept away from bottom plate (11), end cover (2) constitute barrel structure by apron (21) and lid curb plate (22), lid curb plate (22) cover is established the outside of first section (121), lid curb plate (22) are kept away from the tip circumference inboard buckling formation first kink (221) of apron (21), first kink (221) laminating is in on changeover portion (123) lateral surface, apron (21) closing cap is in the port department of barrel casing (1), first section (121) are kept away from between second section (21) and the end of apron (21) have sealing washer (3).
2. The cylindrical battery closure structure according to claim 1, wherein the inner side of the cover side plate (22) is in interference fit with the outer side of the first section (121).
3. The cylindrical battery sealing structure according to claim 1, wherein an end portion of the first section (121) away from the second section (122) is bent inward in a circumferential direction to form a second bent portion (1211), and the first sealing ring (3) is provided between an outer side surface of the second bent portion (1211), an inner side surface of the cover plate (21), and an inner side surface of the cover side plate (22).
4. A cylindrical battery sealing structure according to claim 3, wherein the second bent portion (1211) has a tapered bell mouth shape.
5. A cylindrical battery closure structure according to claim 1, characterized in that the outer side wall of the first section (121) is coated with a structural adhesive.
6. The cylindrical battery sealing structure according to claim 1, wherein the first folded portion (221) has a tapered bell mouth shape.
7. The cylindrical battery sealing structure according to claim 1, wherein the cover plate (21) is fixed with a tab block (42), an insulating block (43), an insulating pad support (44), a second sealing ring (45) and a current collecting disc (46) through rivets (41).
8. The cylindrical battery sealing structure according to claim 7, wherein the cover plate (21) is provided with an explosion-proof valve slot (47).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321460771.XU CN220400722U (en) | 2023-06-09 | 2023-06-09 | Cylindrical battery sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321460771.XU CN220400722U (en) | 2023-06-09 | 2023-06-09 | Cylindrical battery sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220400722U true CN220400722U (en) | 2024-01-26 |
Family
ID=89598403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321460771.XU Active CN220400722U (en) | 2023-06-09 | 2023-06-09 | Cylindrical battery sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220400722U (en) |
-
2023
- 2023-06-09 CN CN202321460771.XU patent/CN220400722U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |