CN218975618U - Cylindrical lithium ion battery - Google Patents
Cylindrical lithium ion battery Download PDFInfo
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- CN218975618U CN218975618U CN202223565958.4U CN202223565958U CN218975618U CN 218975618 U CN218975618 U CN 218975618U CN 202223565958 U CN202223565958 U CN 202223565958U CN 218975618 U CN218975618 U CN 218975618U
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- cylindrical
- gasket
- cylindrical container
- lithium ion
- ion battery
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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 cylindrical lithium ion battery. The diameter (D) of a cylindrical container of the cylindrical lithium ion battery (1) is 46mm or more, a first gasket (6) made of a fluorine-based polymer is provided at one end (2 b) of the cylindrical container (2), a second gasket (7) is provided at the other end (2 c) of the cylindrical container, and the wall thickness of the first gasket and/or the second gasket is 0.4mm or more and 2.0mm or less. According to the present utility model, the sealing property and heat resistance of the sealing portion can be ensured.
Description
Technical Field
The utility model relates to a cylindric lithium ion battery.
Background
Among conventional cylindrical lithium ion batteries, a cylindrical lithium ion battery is known in which a gasket is provided between a bottomed cylindrical container and a lid. In recent years, as a battery for an electric vehicle, a large lithium ion battery having a cylindrical container with a diameter of 46mm or more has been developed.
In such a large lithium ion battery, it is difficult to secure sealing properties, heat resistance, and the like of a sealed portion, as compared with a conventional battery smaller than 46 mm.
Disclosure of Invention
Problems to be solved by the utility model
The purpose of the present utility model is to provide a cylindrical lithium ion battery, which can ensure the tightness and heat resistance of a sealing part even in a large lithium ion battery with a diameter of 46mm or more in a cylindrical container.
Means for solving the problems
In order to solve the above problems, a first aspect of the present utility model is a cylindrical lithium ion battery (1) comprising a cylindrical container having a diameter (D) of 46mm or more and a first gasket (6) made of a fluorine-based polymer at one end (2 b) of the cylindrical container (2), wherein a second gasket (7) is further provided at the other end (2 c) of the cylindrical container, and wherein the wall thickness (t 1 to t 6) of the first gasket and/or the second gasket is 0.4mm or more and 2.0mm or less.
A second aspect of the present utility model is the cylindrical lithium ion battery according to the first aspect, wherein the height (H) of the cylindrical container is 80mm or more.
A third aspect of the present utility model is the cylindrical lithium ion battery according to the second aspect, wherein the first gasket and/or the second gasket is a PFA gasket having a wall thickness (t 1 to t 6) of 0.6mm or more and 1.0mm or less.
A fourth aspect of the present utility model is the cylindrical lithium ion battery according to the third aspect, wherein the cylindrical container has a rivet structure (3) at one end or the other end.
A fifth aspect of the present utility model is the cylindrical lithium ion battery according to the fourth aspect, wherein the rivet joint structure includes: a first cover (31) made of metal, which covers the end of the cylindrical container; an electrode (5); and a first gasket that insulates and seals between the first cover and the electrode, the first cover having a through hole (21) that penetrates from one surface to the other surface, the electrode having: a columnar portion (51) inserted into the through hole of the first cover portion; a first end portion (52) which is formed at the one end portion of the columnar portion and has a diameter (d 12) larger than the diameter (d 11) of the columnar portion; and a second end portion (53) which is formed at the other end portion of the columnar portion and has a diameter (d 13) larger than that of the columnar portion, the first gasket having: a cylindrical portion (61) which is inserted into the through hole of the first cover portion and into which the columnar portion of the electrode is inserted; a third end portion (62) which is formed at the one end portion of the cylindrical portion and has an outer diameter (d 22) that is larger than the outer diameter (d 21) of the cylindrical portion; and a fourth end (63) which is formed at the other end of the cylindrical portion and has an outer diameter (d 23) larger than the outer diameter of the cylindrical portion, wherein the cylindrical portion of the first gasket is disposed between the through hole of the first cover portion and the columnar portion of the electrode, the third end of the first gasket is disposed between the one side surface (31 a) of the first cover portion and the first end of the electrode, and the fourth end of the first gasket is disposed between the other side surface (31 b) of the first cover portion and the second end of the electrode.
A sixth aspect of the present utility model is the cylindrical lithium ion battery according to the fourth aspect, wherein the cylindrical container has a curved caulking structure (4) at an end portion on a side where the rivet caulking structure (3) is not provided.
A seventh aspect of the present utility model is the cylindrical lithium ion battery according to the fifth aspect, wherein the cylindrical container has a curved caulking structure (4) at an end portion on a side where the rivet caulking structure (3) is not provided.
An eighth aspect of the present utility model is the cylindrical lithium ion battery according to the sixth or seventh aspect, wherein the bent caulking structure (4) comprises: a groove (41) formed by recessing a side surface of the cylindrical container toward the inside in the radial direction of the cylindrical container; a bending portion (42) formed by bending an end portion of a side surface of the cylindrical container toward a radial inner side of the cylindrical container; a second cover (43) made of metal, which is arranged between the groove and the bending part and is used for sealing the end part of the cylindrical container; and a second gasket (7) disposed between the groove and the second cover and sealing the groove and the second cover.
A ninth aspect of the present utility model is the cylindrical lithium ion battery according to the eighth aspect, wherein the rivet structure (3) and/or the bent rivet structure (4) does not include an adhesive layer.
Effects of the utility model
According to the cylindrical lithium ion battery of the present utility model, the wall thickness (t 1 to t 6) of the first gasket made of a fluoropolymer located at one end of the cylindrical container and the second gasket located at the other end of the cylindrical container are set to 0.4mm or more and 2.0mm or less, whereby the sealing property and heat resistance of the sealing portion can be ensured even in a large lithium ion battery having a diameter of 46mm or more in the cylindrical container.
Drawings
Fig. 1 is a cross-sectional view of a cylindrical lithium ion battery according to an embodiment of the present utility model.
Fig. 2 is a cross-sectional view of a cylindrical container of the same cylindrical lithium ion battery.
Fig. 3 is a cross-sectional view of the vicinity of an electrode at the upper end of a cylindrical lithium ion battery.
Fig. 4 is a cross-sectional view of the lower end portion of the same cylindrical lithium ion battery.
(description of the reference numerals)
1. Cylindrical lithium ion battery
2. Cylindrical container
2b upper end of cylindrical container
End of the lower side of the 2c cylindrical container
3. Rivet riveting structure
4. Bending riveting structure
5. Electrode
6. First sealing gasket
7. Second sealing gasket
21. Through hole
31a upper surface of the first cover part
31b lower surface of the first cover part
41. Groove part
42. Bending part
43. A second cover part
51. Columnar portion
52. First end portion
53. Second end portion
61. Cylindrical part
62. Third end part
63. Fourth end part
Diameter of D cylindrical container
d11 Diameter of columnar portion
d12 Diameter of the first end
d13 Diameter of the second end
d21 Outer diameter of cylindrical part
d22 Outer diameter of the third end
d23 Outer diameter of fourth end
Height of H-cylindrical container
t1 to t3 wall thickness of the first gasket
t4 to t6 wall thickness of the second gasket
Detailed Description
Hereinafter, the present utility model will be described in detail with reference to the drawings with respect to a 4680 type cylindrical lithium ion battery. In the present description, for convenience, the end portion on one side of the cylindrical container 2 is described as the upper end portion 2b and the end portion on the other side of the cylindrical container 2 is described as the lower end portion 2c, but one side of the cylindrical container 2 may be set to the lower side and the other side may be set to the upper side. As shown in fig. 1, a cylindrical lithium ion battery 1 accommodates a battery member 81 including a positive electrode, a negative electrode, a separator, an electrolyte, and the like, current collecting members 82 to 85, and the like, in a metal cylindrical container 2. In the present embodiment, as described later, the rivet is used as one electrode 5 and the cylindrical container 2 is used as the other electrode, but the second cover 43 may be used as the other electrode.
The cylindrical container of the cylindrical lithium ion battery 1 has a diameter D of 46mm or more, and a first gasket 6 made of a fluorine-based polymer is provided at an upper end 2b of the cylindrical container 2. The diameter D of the cylindrical container 2 is preferably 90mm or less, more preferably 60mm or less. The cylindrical lithium ion battery 1 further includes a second gasket 7 at the lower end 2c of the cylindrical container 2. The first gasket 6 and/or the second gasket 7 are formed so that the wall thicknesses t1 to t6 are not less than 0.4mm and not more than 2.0 mm. The gaskets 6 and 7 not only insulate one electrode 5 from the other electrode, but also seal the electrolyte contained in the cylindrical container 2. By setting the wall thicknesses t1 to t6 of the gaskets 6 and 7 to be 0.4mm or more and 2.0mm or less, the sealing property, heat resistance, and the like of the sealing portion can be ensured even in a large lithium ion battery in which the diameter of the cylindrical container 2 is 46mm or more. When the thickness t1 to t6 of the gasket is less than 0.4mm, both functions of ensuring the sealing property and heat resistance of the sealing portion are not preferable. On the other hand, if the thickness t1 to t6 of the gasket exceeds 2.0mm, the gasket becomes excessively thick beyond necessity, which is disadvantageous in terms of cost. For the same reason, in the case of using PFA as the gasket, the wall thickness (t 1 to t 6) is more preferably 0.6mm or more and 1.0mm or less.
Further, by setting the wall thicknesses t1 to t6 of the gaskets 6 and 7 to be 0.4mm or more and 2.0mm or less, the sealing property, heat resistance, and the like of the sealing portion can be ensured even in a cylindrical lithium ion battery in which the height H of the cylindrical container 2 is 80mm or more. The height H of the cylindrical container 2 is preferably 150mm or less, more preferably 125mm or less.
The cylindrical lithium ion battery 1 of the present embodiment includes a rivet structure 3 at an upper end 2b of the cylindrical container 2, and a curved rivet structure 4 at a lower end 2c (an end on the side where the rivet structure 3 is not provided) of the cylindrical container 2.
The rivet joint structure 3 includes: a first cover 31 made of metal, which covers the end of the cylindrical container 2; an electrode 5; and a gasket 6 that insulates and seals between the first cover 31 and the electrode 5. The first cover 31 is formed of a metal such as aluminum. The first cover 31 has a through hole 21 penetrating from the upper (one side) surface to the lower (other side) surface. In addition, like the cylindrical lithium ion battery 1 shown in fig. 1, the end portion on the side provided with the rivet structure 3 is preferably formed integrally with the side surface of the cylindrical container 2 from the viewpoint of productivity and efficiency.
The electrode 5 has: a columnar portion 51 inserted into the through hole 21 of the first lid portion 31; a first end portion 52 formed at an upper end portion of the columnar portion 51 and having a diameter d12 larger than a diameter d11 of the columnar portion 51; and a second end 53 formed at the lower end of the columnar portion 51 and having a diameter d13 larger than the diameter d11 of the columnar portion 51. The columnar portion 51 may be a cylinder, a prism, a truncated cone, or a truncated pyramid.
The gasket 6 has: a cylindrical portion 61 inserted into the through hole 21 of the first cover portion 31 and into which the columnar portion 51 of the electrode 5 is inserted; a third end 62 formed at an upper end of the cylindrical portion 61 and having an outer diameter d22 larger than the diameter d21 of the cylindrical portion 61; and a fourth end 63 formed at the lower end of the cylindrical portion 61 and having an outer diameter d23 larger than the diameter of the cylindrical portion 61. The cylindrical portion 61 may be a cylinder, a square cylinder, a hollow truncated cone, or a hollow truncated pyramid.
The cylindrical portion 61 of the gasket 6 is disposed between the through hole 21 of the first lid portion 31 and the columnar portion 51 of the electrode 5, the third end portion 62 of the gasket 6 is disposed between the upper surface 31a of the first lid portion 31 and the first end portion 52 of the electrode 5, and the fourth end portion 63 of the gasket 6 is disposed between the lower surface 31b of the first lid portion 31 and the second end portion 53 of the electrode 5. Such a rivet caulking structure 3 is formed by caulking a rivet functioning as the electrode 5 to the first lid portion 31 via the gasket 6 by a known caulking method.
The bent rivet structure 4 includes: a groove 41 formed by recessing a side surface 2a of the cylindrical container 2 toward the inside in the radial direction of the cylindrical container 2; a bent portion 42 (the state of fig. 1 and 4) formed by bending a lower end portion 2c of a side surface 2a of the cylindrical container 2 from the state of fig. 2 toward the inside in the radial direction of the cylindrical container 2; a second cover 43 made of metal, which is disposed between the groove 41 and the bent portion 42, and seals the lower end 2c of the cylindrical container 2; and a gasket 7 disposed between the groove 41 and the second cover 43, for sealing the groove 41 from the second cover 43. The opening 22 of the lower end portion 2c of the cylindrical container 2 is sealed by the gasket 7 and the second cover portion 43.
The gaskets 6 and 7 may be made of a known fluorine-based polymer. As the fluorine-based polymer, a fluororesin or a fluororubber can be used. Examples of the fluororesin include a copolymer (PFA) of tetrafluoroethylene and perfluoroalkyl vinyl ether, polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoroethylene copolymer (FEP), ethylene tetrafluoroethylene copolymer (ETFE), tetrafluoroethylene-chlorotrifluoroethylene-fluorovinyl ether copolymer, ethylene-tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoroethylene copolymer, and the like. Examples of the fluororubber include vinylidene fluoride-hexafluoropropylene copolymer and vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer. PFA is particularly preferred from the viewpoints of sealability and heat resistance. When the sealing gaskets 6 and 7 are made of a fluorine-based polymer, as in the present embodiment, the rivet structure 3 and/or the bending rivet structure 4 can ensure high sealing properties even without an adhesive layer.
Claims (9)
1. A cylindrical lithium ion battery (1) having a diameter (D) of a cylindrical container of 46mm or more and having a first gasket (6) made of a fluorine-based polymer at one end (2 b) of the cylindrical container (2), characterized in that,
the other end (2 c) of the cylindrical container is further provided with a second gasket (7),
the wall thickness (t 1-t 6) of the first gasket and/or the second gasket is 0.4mm or more and 2.0mm or less.
2. The cylindrical lithium ion battery of claim 1, wherein the battery comprises a plurality of electrodes,
the height (H) of the cylindrical container is 80mm or more.
3. The cylindrical lithium ion battery of claim 2, wherein the battery comprises a plurality of electrodes,
the first gasket and/or the second gasket is a PFA gasket having a wall thickness (t 1 to t 6) of 0.6mm or more and 1.0mm or less.
4. The cylindrical lithium ion battery of claim 3, wherein the battery comprises a plurality of lithium-ion batteries,
a rivet structure (3) is provided at one end or the other end of the cylindrical container.
5. The cylindrical lithium ion battery of claim 4, wherein the battery comprises a plurality of electrodes,
the rivet setting structure includes: a first cover (31) made of metal, which covers the end of the cylindrical container; an electrode (5); and a first gasket that insulates and seals between the first cover portion and the electrode,
the first cover part is provided with a through hole (21) penetrating from one side surface to the other side surface,
the electrode has: a columnar portion (51) inserted into the through hole of the first cover portion; a first end portion (52) which is formed at the one end portion of the columnar portion and has a diameter (d 12) larger than the diameter (d 11) of the columnar portion; and a second end portion (53) formed at the other end portion of the columnar portion and having a diameter (d 13) larger than that of the columnar portion,
the first gasket has: a cylindrical portion (61) which is inserted into the through hole of the first cover portion and into which the columnar portion of the electrode is inserted; a third end portion (62) which is formed at the one end portion of the cylindrical portion and has an outer diameter (d 22) that is larger than the outer diameter (d 21) of the cylindrical portion; and a fourth end portion (63) formed at the other end portion of the cylindrical portion and having an outer diameter (d 23) larger than the outer diameter of the cylindrical portion,
the cylindrical portion of the first gasket is disposed between the through hole of the first cover portion and the columnar portion of the electrode, the third end portion of the first gasket is disposed between the one side surface (31 a) of the first cover portion and the first end portion of the electrode, and the fourth end portion of the first gasket is disposed between the other side surface (31 b) of the first cover portion and the second end portion of the electrode.
6. The cylindrical lithium ion battery of claim 4, wherein the battery comprises a plurality of electrodes,
a curved caulking structure (4) is provided at the end of the cylindrical container on the side where the rivet caulking structure (3) is not provided.
7. The cylindrical lithium ion battery of claim 5, wherein the battery comprises,
a curved caulking structure (4) is provided at the end of the cylindrical container on the side where the rivet caulking structure (3) is not provided.
8. The cylindrical lithium ion battery according to claim 6 or 7, wherein,
the curved rivet structure (4) comprises: a groove (41) formed by recessing a side surface of the cylindrical container toward the inside in the radial direction of the cylindrical container; a bending portion (42) formed by bending an end portion of a side surface of the cylindrical container toward a radial inner side of the cylindrical container; a second cover (43) made of metal, which is arranged between the groove and the bending part and is used for sealing the end part of the cylindrical container; and a second gasket (7) disposed between the groove and the second cover and sealing the groove and the second cover.
9. The cylindrical lithium ion battery of claim 8, wherein the battery comprises a plurality of electrodes,
the rivet structure (3) and/or the curved rivet structure (4) do not have an adhesive layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223565958.4U CN218975618U (en) | 2022-12-30 | 2022-12-30 | Cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223565958.4U CN218975618U (en) | 2022-12-30 | 2022-12-30 | Cylindrical lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218975618U true CN218975618U (en) | 2023-05-05 |
Family
ID=86167640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223565958.4U Active CN218975618U (en) | 2022-12-30 | 2022-12-30 | Cylindrical lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218975618U (en) |
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2022
- 2022-12-30 CN CN202223565958.4U patent/CN218975618U/en active Active
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