CN112820948A - Cylindrical lithium ion battery - Google Patents
Cylindrical lithium ion battery Download PDFInfo
- Publication number
- CN112820948A CN112820948A CN202110221149.2A CN202110221149A CN112820948A CN 112820948 A CN112820948 A CN 112820948A CN 202110221149 A CN202110221149 A CN 202110221149A CN 112820948 A CN112820948 A CN 112820948A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- cylindrical lithium
- positioning
- winding core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 56
- 238000004804 winding Methods 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 238000013022 venting Methods 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 6
- 238000003466 welding Methods 0.000 description 24
- 239000011888 foil Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a cylindrical lithium ion battery, and belongs to the technical field of batteries. The cylindrical lithium ion battery comprises a roll core assembly, a shell and a cap assembly, wherein the roll core assembly comprises a first positioning part; the shell is wrapped outside the roll core assembly, and one end of the shell is open; the cap assembly is arranged at the opening of the shell and comprises a top cap and a sealing ring, the top cap is positioned at the upper part of the winding core assembly, and the sealing ring is positioned between the top cap and the shell to seal and insulate the top cap and the shell; the top cap includes second location portion, and second location portion and first location portion cooperation are connected in order to fix a position and fix rolling up core assembly. The cylindrical lithium ion battery has a simple structure, simplifies the processing steps and reduces the cost; and the safety of the battery is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a cylindrical lithium ion battery.
Background
The traditional cap assembly of the cylindrical lithium ion battery generally comprises five structures, namely a steel cap, an explosion-proof valve, a small aluminum sheet, a sealing ring, an insulating gasket and the like, has a complex structure and is difficult to process, and the cost is increased; and when the battery is impacted to cause the roll core and the shell to rotate relatively, the lug and the cap component support are easily subjected to desoldering, and the use of the battery is influenced.
Therefore, a cylindrical lithium ion battery with simple structure and high safety is needed to solve the above technical problems in the prior art.
Disclosure of Invention
The invention aims to provide a cylindrical lithium ion battery which is simple in structure, simplifies processing steps and reduces cost; and the safety of the battery is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cylindrical lithium ion battery comprising:
the winding core assembly comprises a first positioning part;
the shell is wrapped outside the roll core assembly, and one end of the shell is open;
the cover cap assembly is arranged at the opening of the shell and comprises a cover cap and a sealing ring, the cover cap is positioned at the upper part of the winding core assembly, and the sealing ring is positioned between the cover cap and the shell so as to seal and insulate the cover cap and the shell;
the top cap includes second location portion, second location portion with first location portion cooperation is connected in order to roll up core assembly location and fixed.
As a preferred technical scheme of the cylindrical lithium ion battery, the top cover further comprises an explosion-proof part, and the explosion-proof part is used for preventing the cylindrical lithium ion battery from being exploded.
As a preferred technical solution of the cylindrical lithium ion battery, the top cap further includes an exhaust hole for exhausting gas inside the cylindrical lithium ion battery.
As a preferred technical scheme of the cylindrical lithium ion battery, the second positioning portion is a positioning through hole located in the middle of the top cover, the first positioning portion is a second positioning protrusion, and the second positioning protrusion is connected in the positioning through hole.
As a preferable technical solution of the cylindrical lithium ion battery, the vent hole is formed by a gap between the second positioning protrusion and the positioning through hole.
As a preferred technical solution of the cylindrical lithium ion battery, the second positioning portion is a first positioning protrusion located in the middle of the top cover, the first positioning portion is a second positioning protrusion, a top surface of the second positioning protrusion abuts against and is fixed to a top surface of the first positioning protrusion, and the exhaust hole is annularly arranged outside the second positioning portion.
As a preferred technical solution of a cylindrical lithium ion battery, the winding core assembly includes:
a winding core;
the positive bus disc is positioned at one end of the roll core and is connected with a positive electrode tab of the roll core;
the negative pole confluence disc is positioned at the other end of the roll core and is connected with a negative pole lug of the roll core;
the first positioning portion is arranged on the positive pole confluence disc or the negative pole confluence disc.
As an optimal technical scheme of the cylindrical lithium ion battery, the anode tab and the cathode tab are integrally arranged with the winding core.
As a preferred technical scheme of the cylindrical lithium ion battery, the surface of the positive pole confluence disc connected with the positive pole lug of the winding core is uneven;
the surface of the negative pole confluence disc connected with the negative pole lug of the roll core is uneven.
As a preferred technical scheme of the cylindrical lithium ion battery, a first spiral protruding structure is arranged on the surface, connected with the positive electrode lug, of the positive electrode confluence disc.
As a preferred technical scheme of the cylindrical lithium ion battery, a second spiral protruding structure is arranged on the surface of the negative pole confluence disc connected with the negative pole lug.
As a preferred technical solution of the cylindrical lithium ion battery, the sealing ring includes a first insulating connection portion and a second insulating connection portion that are connected to each other, the first insulating connection portion is located between the upper surface of the top cover and the housing, and the second insulating connection portion is located between the lower surface of the top cover and the housing.
As a preferred technical solution of the cylindrical lithium ion battery, the sealing ring further includes a shielding insulating portion connected to the second insulating connecting portion;
the shielding insulating part is shielded between the shell and the positive pole convergence plate; or the shielding insulating part is shielded between the shell and the negative pole confluence disc.
The invention provides a cylindrical lithium ion battery, which comprises a roll core assembly, a shell and a cap assembly, wherein the cap assembly comprises a top cover and a sealing ring, so that the number of parts of the cap assembly is reduced, the structure of the cylindrical lithium ion battery is simplified, the processing steps are simplified, and the cost is reduced; roll up the core assembly and include first location portion, the top cap includes second location portion, and first location portion and second location portion cooperation are connected to play the effect to roll up core assembly location and fixed, reduce the risk of utmost point ear and the separation of block subassembly in the core assembly, improved the security of battery.
Drawings
Fig. 1 is a schematic structural diagram of a cylindrical lithium ion battery according to a first embodiment of the present invention;
fig. 2 is a cross-sectional view of a cylindrical lithium ion battery provided in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a positive bus bar according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a sealing ring according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a seal ring according to one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a part of a positive foil after interval cutting according to an embodiment of the present invention;
fig. 7 is a cross-sectional view of a cylindrical lithium ion battery according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a top cover according to a first viewing angle provided in the second embodiment of the present invention;
fig. 9 is a structural diagram of a top cover according to a second viewing angle provided in the second embodiment of the present invention;
fig. 10 is a schematic structural diagram of a first view angle of a positive bus bar according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a second view angle of the positive bus bar according to the second embodiment of the present invention;
fig. 12 is a schematic structural diagram of a negative bus bar provided in the second embodiment of the present invention.
Reference numerals:
1. a core assembly; 11. a winding core; 111. a positive foil; 12. a positive pole collector plate; 121. a first positioning portion; 13. a negative pole confluence plate;
2. a housing;
3. a cap assembly; 31. a top cover; 311. a second positioning portion; 312. an explosion-proof part; 313. an exhaust hole; 32. a seal ring; 321. a first insulating connection portion; 322. a second insulating connection portion; 323. a shielding insulating part;
4. the air hole seals the plug.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1 to 3, the present embodiment provides a cylindrical lithium ion battery, which includes a roll core assembly 1, a case 2, and a cap assembly 3, wherein the roll core assembly 1 includes a first positioning portion 121; the shell 2 is wrapped outside the winding core assembly 1, and one end of the shell 2 is open; the cap assembly 3 is arranged at the opening of the shell 2, the cap assembly 3 comprises a top cover 31 and a sealing ring 32, the top cover 31 is positioned at the upper part of the winding core assembly 1, and the sealing ring 32 is positioned between the top cover 31 and the shell 2 so as to seal and insulate the top cover 31 and the shell 2; the top cover 31 includes a second positioning portion 311, and the second positioning portion 311 and the first positioning portion 121 are cooperatively connected to position and fix the winding core assembly 1.
The cap component 3 comprises a top cap 31 and a sealing ring 32, so that the number of parts of the cap component 3 is reduced, the structure of the cylindrical lithium ion battery is simplified, the processing steps are simplified, the cost is reduced, the space is reasonably utilized, and the function utilization of the top cap 31 is improved; roll up core subassembly 1 and include first location portion 121, top cap 31 includes second location portion 311, and first location portion 121 and second location portion 311 cooperation are connected to play the effect to roll up core subassembly 1 location and fixed, reduce the risk of utmost point ear in the core subassembly 1 and the separation of block subassembly 3, improved the security of battery. It should be noted that the external gas collecting device may be any device capable of generating negative pressure and storing gas, which is conventional in the prior art, and the detailed structure thereof is not described herein.
Preferably, the top cover 31 further includes an explosion-proof part 312, and the explosion-proof part 312 is used for explosion-proof of the cylindrical lithium ion battery. By integrating the explosion-proof function on the top cover 31, not only are parts reduced, but also the safe use of the cylindrical lithium ion battery is ensured.
Preferably, the top cap 31 further includes a gas discharge hole 313, and the gas discharge hole 313 is used to discharge gas inside the cylindrical lithium ion battery. During the formation process, gas is exhausted through the exhaust holes 313 on the top cover 31, and an external gas collecting device is communicated with the exhaust holes 313, so that the effects of exhausting and collecting the gas generated in the formation process are realized, the environment pollution is avoided, and the safety of the battery is improved.
As shown in fig. 2, in the present embodiment, the second positioning portion 311 is a positioning through hole located in the middle of the top cover 31, the first positioning portion 121 is a second positioning protrusion connected in the positioning through hole, and a gap between the second positioning protrusion and the positioning through hole forms the air vent 313. The exhaust hole 313 is communicated with the outside during the formation process so as to facilitate the discharge of gas, and after the formation is finished, the exhaust hole 313 is sealed. The explosion-proof portion 312 is disposed around the second positioning portion 311.
Specifically, as shown in fig. 2, the winding core assembly 1 includes a winding core 11, a positive bus bar 12 and a negative bus bar 13, wherein the positive bus bar 12 is located at one end of the winding core 11 and is connected with a positive tab of the winding core 11; the negative bus bar 13 is positioned at the other end of the winding core 11 and is connected with a negative pole tab of the winding core 11; the first positioning portion 121 is provided on the positive bus bar 12 or the negative bus bar 13. The connection mode of rolling up core 11 and shell 2 has been optimized, and through the design dish structure that converges, the utmost point ear of rolling up core 11 need not rub flat just can with converge dish welded connection, on the one hand, reduces and rubs the metal fillings that flat produced, and on the other hand, utmost point ear erects the state, and the clearance is than the size after rubbing flat will be big, the electrolyte of being convenient for is submerged.
Preferably, in the present embodiment, the first positioning portion 121 is provided on the positive bus bar 12. Further, the positive pole confluence plate 12 includes a first positive pole welding protrusion located in the middle, the first positioning portion 121 is located on the first positive pole welding protrusion, and when the first positioning portion 121 and the second positioning portion 311 are connected in a positioning manner, the upper surface of the first positive pole welding protrusion abuts against the top cover 31, and the first positive pole welding protrusion is fixed with the top cover 31 in a welding manner. In the present embodiment, the explosion-proof portion 312 is an annular region that is provided around the outside of the welding region of the top cover 31.
Preferably, the positive electrode tab and the negative electrode tab are both integrally provided with the winding core 11. The method specifically comprises the following steps: the conventional tab welding structure is eliminated, in this embodiment, an end portion of one side of the positive electrode tab is left with a positive electrode foil 111 which is not coated with the positive electrode slurry, an end portion of one side of the negative electrode tab is left with a negative electrode foil which is not coated with the positive electrode slurry, the positive electrode foil 111 and the negative electrode foil are respectively located at two ends of the winding core 11, and before the winding core 11 is wound, as shown in fig. 6, the positive electrode foil 111 and the negative electrode foil are cut at intervals to form a positive electrode tab and a negative electrode tab which are convenient to press down, the current of the winding core 11 is led out by the positive electrode tab and the negative electrode tab, and the current cannot be output intensively due to the positive electrode tab and the negative electrode tab, so that the current is converged on the positive electrode convergence disk 12 and the negative electrode convergence disk 13 and is output outwards by connecting the positive electrode tab and the negative electrode tab with the positive electrode convergence disk 12 and the negative electrode convergence disk 13. The electric connection mode of the cylindrical lithium ion battery is optimized, the battery connection channels are reduced, and compared with the connection channels of the traditional battery: positive pole foil, utmost point ear, apron aluminum sheet, nickel plating steel cap, only through positive pole foil 111 in this embodiment, converge dish, top cap 31 can, the effective area of contact after the optimization increases to promote battery current capacity, reduced the internal resistance of battery.
Preferably, the heights of the positive electrode lug and the negative electrode lug are both 1 mm-3 mm.
In this embodiment, the positive electrode tab and the negative electrode tab are connected to the positive bus plate 12 and the negative bus plate 13 by welding. Preferably, in this embodiment, in order to facilitate the welding of the positive electrode tab and the negative electrode tab with the positive electrode confluence disc 12 and the negative electrode confluence disc 13, respectively, the material of the positive electrode confluence disc 12 is the same as that of the positive electrode tab, and the material of the negative electrode confluence disc 13 is the same as that of the negative electrode tab.
As shown in fig. 3, in the present embodiment, the positive bus bar 12 includes two waist-shaped groove structures arranged circumferentially, and the bottom surfaces of the waist-shaped groove structures are welded to the positive electrode tab.
Further, still be provided with on the anodal confluence disc 12 and overflow fusing portion, overflow fusing portion and be located between the positive pole utmost point ear and the positive pole confluence disc 12's the weld zone and the positive pole confluence disc 12 and top cap 31's weld zone, overflow fusing portion's thickness and the thickness of anodal confluence disc 12's other positions will be thin to guarantee when the electric current is unusual, overflow fusing portion can in time break.
Cylindrical lithium ion battery still includes insulating gasket, and insulating gasket sets up the edge on anodal confluence disc 12 to it is insulating with anodal confluence disc 12 and shell 2. Preferably, for guaranteeing that the position of insulating spacer can not remove, it has insulating tape still to wrap up at insulating spacer, when can further guarantee the insulating spacer position, can also guarantee that anodal pole converges dish 12 and shell 2 and insulate.
Preferably, the surface of the positive bus disc 12 connected with the positive electrode tab of the winding core 11 is uneven; the surface of the negative pole confluence disc 13 connected with the negative pole lug of the winding core 11 is uneven, so that the process of welding the positive pole lug and the negative pole lug with the positive pole confluence disc 12 and the negative pole confluence disc 13 does not need secondary arrangement, and the welding can be directly carried out, the process of kneading and flattening the positive pole lug and the negative pole lug to topple towards the center by extrusion is omitted, and the processing is simpler and more convenient; and the effective contact area of the lug and the bus disc is increased by the rugged structure, and the reliability of connection of the lug and the bus disc is ensured.
Specifically, the surface of the positive bus bar 12 connected to the positive tab is provided with a first spiral protrusion structure, and the positive tab is connected to the positive bus bar 12 by laser welding from the outside of the case 2 to the inside. And a second spiral protruding structure is arranged on the surface of the negative electrode confluence disc 13 connected with the negative electrode lug. It should be noted that the pitches of the first spiral protrusion structure and the second spiral protrusion structure can be designed and adjusted according to actual needs.
Preferably, in this embodiment, the first spiral protruding structure on the positive pole confluence disc 12 is mainly distributed in the area near the outer ring, because the perimeter of the outer ring area of the winding core 11 is longer, therefore, the total length of the positive pole tab is longer, thereby improving the effective area of the first spiral protruding structure connected with the positive pole tab, and ensuring the reliability of the positive pole tab connected with the first spiral protruding structure. In other embodiments, the connection region of the positive bus bar 12 and the positive tab may be a middle region or a region near the outer ring of the positive bus bar 12, or both.
Preferably, the circumferential edge of the negative pole confluence disc 13 is provided with a vertical outer edge wall to prevent the negative pole tab from protruding outwards after being pressed.
As shown in fig. 3, the positive bus bar 12 is further provided with a plurality of hollow areas for facilitating outward circulation of gas and discharging of electrolyte, the hollow areas are disposed in the first positioning portion 121 and other areas of the welding area, and the shapes and specific positions of the hollow areas are not further described herein.
As shown in fig. 4 and 5, the sealing ring 32 includes a first insulating connection portion 321 and a second insulating connection portion 322 connected to each other, the first insulating connection portion 321 being located between the upper surface of the top cover 31 and the housing 2, and the second insulating connection portion 322 being located between the lower surface of the top cover 31 and the housing 2. Cylindrical lithium ion battery is sealing the back, and shell 2 converges through the negative pole and coils 13 and be connected with the negative pole utmost point ear of rolling up core 11, and top cap 31 converges through anodal 12 and is connected with the anodal utmost point ear of rolling up core 11 for shell 2 avoids shell 2 and top cap 31 contact short circuit when extrusion fixed top cap 31 through setting up sealing washer 32.
Preferably, as shown in fig. 4 and 5, the sealing ring 32 further includes a shielding insulating part 323 connected to the second insulating connecting part 322; the shielding insulating part 323 shields between the casing 2 and the positive bus bar 12; or shelter from insulating part 323 and shelter from between shell 2 and negative pole converge dish 13, guarantee that shell 2 after top cap 31 and anodal converge dish 12 or negative pole converge the rolling slot between dish 13, the condition that shell 2 and anodal converge dish 12 or negative pole converge the contact of dish 13 and take place the short circuit. Preferably, in the present embodiment, the shielding insulating portion 323 shields between the case 2 and the positive bus bar 12.
In this embodiment, after the cell is sealed, the total height of the cell is compressed by mechanical pressure, ensuring that the top cover 31 is in direct contact with the internal positive bus plate 12. Laser welding is performed around the central gas discharge hole 313 area, the top cover 31 and the positive bus bar 12 are welded together, and the central gas discharge hole 313 is sealed to complete the final sealing of the battery. The working procedure can be divided into two steps, and the total height of the battery can be finished in the sealing working procedure; after formation, the central zone weld may be vented after cell formation and then welded.
Example two
As shown in fig. 7 to 9, the present embodiment further provides a cylindrical lithium ion battery, which is different from the cylindrical lithium ion battery in the first embodiment, in which the second positioning portion 311 of the cylindrical lithium ion battery in the present embodiment is a first positioning protrusion located in the middle of the top cover 31, the first positioning portion 121 is a second positioning protrusion, a top surface of the second positioning protrusion abuts against and is fixed to a top surface of the first positioning protrusion, and the explosion-proof portion 312 and the exhaust hole 313 are annularly disposed outside the second positioning portion 311. In this embodiment, the cylindrical lithium ion battery further includes a gas hole sealing plug 4, and the gas hole sealing plug 4 is used for sealing the gas vent hole 313.
As shown in fig. 10 and 11, in this embodiment, the positive bus bar 12 includes four fan-shaped welding groove regions arranged circumferentially, and one side of the four fan-shaped welding groove regions close to the top cover 31 is provided with a plurality of welding spots, so that the later welding is facilitated, and the work efficiency is improved.
As shown in fig. 12, in this embodiment, the negative bus bar 13 includes an annular projection welding area, and a plurality of welding spots are disposed on a surface of the annular projection welding area facing away from the winding core 11, so as to facilitate later welding and improve work efficiency.
Preferably, in the present embodiment, the welding points are all circular welding points.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (13)
1. A cylindrical lithium ion battery, comprising:
a winding core assembly (1) including a first positioning portion (121);
the shell (2) is wrapped outside the winding core assembly (1), and one end of the shell (2) is open;
a cap assembly (3) disposed at an opening of the outer shell (2), the cap assembly (3) including a cap (31) and a sealing ring (32), the cap (31) being located at an upper portion of the core assembly (1), the sealing ring (32) being located between the cap (31) and the outer shell (2) to seal and insulate the cap (31) and the outer shell (2);
the top cover (31) comprises a second positioning part (311), and the second positioning part (311) is matched and connected with the first positioning part (121) to position and fix the winding core assembly (1).
2. The cylindrical lithium ion battery of claim 1, wherein the top cover (31) further comprises an explosion-proof portion (312), the explosion-proof portion (312) being for explosion-proof of the cylindrical lithium ion battery.
3. The cylindrical lithium ion battery of claim 1, wherein the top cover (31) further comprises a vent hole (313), the vent hole (313) for venting gas inside the cylindrical lithium ion battery.
4. The cylindrical lithium ion battery according to claim 3, wherein the second positioning portion (311) is a positioning through hole located in the middle of the top cover (31), and the first positioning portion (121) is a second positioning protrusion connected in the positioning through hole.
5. The cylindrical lithium ion battery according to claim 4, wherein a gap between the second positioning protrusion and the positioning through hole forms the air vent hole (313).
6. The cylindrical lithium ion battery according to claim 3, wherein the second positioning portion (311) is a first positioning protrusion located at the middle of the top cover (31), the first positioning portion (121) is a second positioning protrusion, the top surface of the second positioning protrusion abuts against and is fixed to the top surface of the first positioning protrusion, and the exhaust hole (313) is annularly arranged outside the second positioning portion (311).
7. The cylindrical lithium ion battery according to any one of claims 1 to 6, wherein the winding core assembly (1) comprises:
a winding core (11);
the positive pole confluence disc (12) is positioned at one end of the winding core (11) and is connected with a positive pole lug of the winding core (11);
the negative pole confluence disc (13) is positioned at the other end of the winding core (11) and is connected with a negative pole lug of the winding core (11);
the first positioning portion (121) is provided on the positive pole bus bar (12) or the negative pole bus bar (13).
8. The cylindrical lithium ion battery according to claim 7, wherein the positive electrode tab and the negative electrode tab are both provided integrally with the winding core (11).
9. The cylindrical lithium ion battery according to claim 7, characterized in that the surface of the positive electrode collector disc (12) connected with the positive electrode tab of the winding core (11) is uneven;
the surface of the negative pole confluence disc (13) connected with the negative pole lug of the winding core (11) is uneven.
10. The cylindrical lithium ion battery according to claim 9, characterized in that the surface of the positive bus plate (12) connected with the positive tab is provided with a first spiral-shaped raised structure.
11. The cylindrical lithium ion battery according to claim 9, characterized in that the surface of the negative bus bar (13) connected with the negative electrode tab is provided with a second spiral-shaped raised structure.
12. The cylindrical lithium ion battery according to claim 7, wherein the sealing ring (32) comprises a first insulating connection portion (321) and a second insulating connection portion (322) connected to each other, the first insulating connection portion (321) is located between the upper surface of the top cover (31) and the case (2), and the second insulating connection portion (322) is located between the lower surface of the top cover (31) and the case (2).
13. The cylindrical lithium ion battery according to claim 12, wherein the sealing ring (32) further comprises a shielding insulating portion (323) connected to the second insulating connecting portion (322);
the shielding insulating part (323) is shielded between the shell (2) and the positive pole confluence disc (12); or the shielding insulating part (323) is shielded between the shell (2) and the negative pole confluence disc (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110221149.2A CN112820948A (en) | 2021-02-26 | 2021-02-26 | Cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110221149.2A CN112820948A (en) | 2021-02-26 | 2021-02-26 | Cylindrical lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112820948A true CN112820948A (en) | 2021-05-18 |
Family
ID=75862321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110221149.2A Pending CN112820948A (en) | 2021-02-26 | 2021-02-26 | Cylindrical lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112820948A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113270669A (en) * | 2021-06-17 | 2021-08-17 | 湖北亿纬动力有限公司 | Electrode cover plate and battery |
| CN114421001A (en) * | 2022-01-28 | 2022-04-29 | 蓝京新能源(嘉兴)有限公司 | High-safety high-magnification cylindrical battery and assembly process thereof |
| CN115513514A (en) * | 2022-09-06 | 2022-12-23 | 天津力神电池股份有限公司 | Single battery and preparation method thereof |
| WO2023133904A1 (en) * | 2022-01-17 | 2023-07-20 | 宁德时代新能源科技股份有限公司 | Cell, manufacturing method and device therefor, battery and electric apparatus |
| WO2024066234A1 (en) * | 2022-09-29 | 2024-04-04 | 蓝京新能源(嘉兴)有限公司 | Cylindrical battery and assembly process therefor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202282423U (en) * | 2011-09-26 | 2012-06-20 | 珠海银通新能源有限公司 | Ring-shaped lithium-ion power battery |
| CN206893699U (en) * | 2017-06-01 | 2018-01-16 | 荆州市沃特玛电池有限公司 | A kind of cylindrical end face weld battery |
| CN108807734A (en) * | 2017-05-05 | 2018-11-13 | 济南圣泉集团股份有限公司 | Energy storage device and its packaging technology |
| CN209544507U (en) * | 2019-05-20 | 2019-10-25 | 深圳市比克动力电池有限公司 | A kind of column lithium ion battery |
| CN210897346U (en) * | 2019-06-21 | 2020-06-30 | 苏州安靠电源有限公司 | Battery with a battery cell |
| CN214505581U (en) * | 2021-02-26 | 2021-10-26 | 湖北亿纬动力有限公司 | Cylindrical lithium ion battery |
-
2021
- 2021-02-26 CN CN202110221149.2A patent/CN112820948A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202282423U (en) * | 2011-09-26 | 2012-06-20 | 珠海银通新能源有限公司 | Ring-shaped lithium-ion power battery |
| CN108807734A (en) * | 2017-05-05 | 2018-11-13 | 济南圣泉集团股份有限公司 | Energy storage device and its packaging technology |
| CN206893699U (en) * | 2017-06-01 | 2018-01-16 | 荆州市沃特玛电池有限公司 | A kind of cylindrical end face weld battery |
| CN209544507U (en) * | 2019-05-20 | 2019-10-25 | 深圳市比克动力电池有限公司 | A kind of column lithium ion battery |
| CN210897346U (en) * | 2019-06-21 | 2020-06-30 | 苏州安靠电源有限公司 | Battery with a battery cell |
| CN214505581U (en) * | 2021-02-26 | 2021-10-26 | 湖北亿纬动力有限公司 | Cylindrical lithium ion battery |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113270669A (en) * | 2021-06-17 | 2021-08-17 | 湖北亿纬动力有限公司 | Electrode cover plate and battery |
| WO2023133904A1 (en) * | 2022-01-17 | 2023-07-20 | 宁德时代新能源科技股份有限公司 | Cell, manufacturing method and device therefor, battery and electric apparatus |
| US11984622B1 (en) | 2022-01-17 | 2024-05-14 | Contemporary Amperex Technology Co., Limited | Battery cell, method and apparatus of manufacturing the same, battery, and electric apparatus |
| CN114421001A (en) * | 2022-01-28 | 2022-04-29 | 蓝京新能源(嘉兴)有限公司 | High-safety high-magnification cylindrical battery and assembly process thereof |
| CN115513514A (en) * | 2022-09-06 | 2022-12-23 | 天津力神电池股份有限公司 | Single battery and preparation method thereof |
| WO2024066234A1 (en) * | 2022-09-29 | 2024-04-04 | 蓝京新能源(嘉兴)有限公司 | Cylindrical battery and assembly process therefor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214505580U (en) | Cylindrical lithium ion battery | |
| CN112820948A (en) | Cylindrical lithium ion battery | |
| CN114628866A (en) | High-energy-density cylindrical battery and assembly process thereof | |
| CN215578775U (en) | Cylindrical battery with novel structure | |
| KR100786871B1 (en) | Secondary battery | |
| KR20060118115A (en) | Secondary battery | |
| US6207319B1 (en) | Cap assembly for secondary battery | |
| CN218005057U (en) | Cover plate assembly and battery | |
| CN215266588U (en) | Shaping structure and cylindrical battery thereof | |
| CN210379131U (en) | Button cell | |
| JP4312296B2 (en) | Secondary battery cap assembly | |
| CN115377623B (en) | Current collector, battery pack and electric equipment | |
| CN113809443A (en) | Cylindrical aluminum shell battery and manufacturing method thereof | |
| CN216928872U (en) | Current collecting disc and cylindrical battery | |
| CN210743993U (en) | Top cap assembly, secondary battery, battery module and device | |
| CN113871763B (en) | Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery | |
| CN218300122U (en) | Battery case and battery | |
| CN214505581U (en) | Cylindrical lithium ion battery | |
| CN215220838U (en) | Battery case, battery and vehicle | |
| CN213520071U (en) | Battery welded without electrode lug | |
| CN210379217U (en) | Cylindrical battery and battery cap thereof | |
| CN210403778U (en) | Button cell for improving radial space utilization rate | |
| CN217215018U (en) | Current collecting disc and cylindrical battery | |
| CN116387638A (en) | Cylindrical battery and manufacturing method thereof | |
| CN216793839U (en) | Battery cell structure and battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |