All-tab cylindrical battery

Abstract

The utility model discloses a full-tab cylindrical battery which comprises a shell and a cover body arranged on the shell, the shell is provided with a first end and a second end opposite to the first end, a pole is arranged in the middle of the end face of the first end, a through hole is formed in the pole in the axial direction of the shell, a naked battery cell is arranged in the shell, a first full tab is arranged at one end of the naked battery cell, and a second full tab is arranged at the other end of the naked battery cell. The other end of the bare battery cell is provided with a second full tab, the first full tab is electrically connected with a first collector plate, the first collector plate is provided with a convex part corresponding to the through hole, and the convex part is embedded in the through hole and is hermetically connected with the bottom of the pole; the second full tab is electrically connected with the second collector plate, an annular boss protruding towards the second end of the shell is further arranged in the middle of the second collector plate, the annular boss is connected with the cover body in a laser penetration welding mode, and the cover body is connected with the second end of the shell in a sealed mode. According to the utility model, the pole is provided with the through hole and is connected with the side surface of the lug boss by utilizing the through hole, so that the connecting surface is larger, and the requirement of large open-current area of a large cylindrical battery can be met.

Description

Technical Field

[0001] The utility model relates to the field of cylindrical batteries, in particular to a full-ear cylindrical battery. Background Art

[0002] With the rapid development of the lithium battery industry, traditional 18650 / 21700 cells can no longer meet the requirements of energy density and fast charging. The development of full-ear cell technology has greatly improved the energy density and fast charging capabilities of lithium batteries. Especially on large power cylinders, high voltage and high current charging are the only way to fast charge. Large cylindrical cells are mostly welded by torque welding or collector plate adapters, and the flow area is limited. When fast charging with high current, the cell temperature rises high, which is extremely unfavorable to the safety of the cell. Therefore, designing a large cylindrical cell structure with a large flow area has become a key direction to overcome. Summary of the invention

[0003] The utility model aims to provide a full-ear cylindrical battery to solve the problem of limited welding flow area of ​​existing cylindrical batteries.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a full-pole lug cylindrical battery, comprising a shell with a hollow structure and a cover body arranged on the shell, the shell having a first end and a second end opposite to the first end, a pole is arranged in the middle of the end surface of the first end, and the second end is open, and the pole is provided with a through hole along the axial direction of the shell, a bare battery cell is arranged in the shell, a first full-pole lug is arranged at one end of the bare battery cell, and a second full-pole lug is arranged at the other end of the bare battery cell, the first full-pole lug is electrically connected to a first current collecting disk, a protrusion is arranged on the first current collecting disk corresponding to the through hole, the protrusion is embedded in the through hole and is sealed with the bottom of the pole; the second full-pole lug is electrically connected to a second current collecting disk, and an annular boss protruding toward the second end of the shell is also arranged in the middle of the second current collecting disk, the annular boss is welded to the cover body by laser penetration welding, and the cover body is sealed with the second end of the shell.

[0005] Preferably, a sunken platform portion recessed toward the annular boss is provided on the cover body corresponding to the annular boss, and the annular boss is connected to the sunken platform portion by laser penetration welding.

[0006] Preferably, the bare battery cell is provided with a first liquid seepage hole along its axial direction, a second liquid seepage hole is provided in the middle of the annular boss, a liquid injection hole is correspondingly provided in the middle of the sinking platform part, and the first liquid seepage hole, the second liquid seepage hole and the liquid injection hole are coaxially arranged.

[0007] Preferably, the first current collecting disk includes a first disk-shaped body and the raised portion formed by the middle portion of the first disk-shaped body protruding outward, the raised portion having a side wall and a bottom wall connected to the side wall, the side wall is laser seam welded to the bottom of the pole, and the first disk-shaped body is welded to the first full pole ear.

[0008] Preferably, the second current collecting plate comprises a second plate-shaped body, the second liquid seepage hole is provided in the middle of the second plate-shaped body, and the annular boss extends toward the center thereof to form an annular extension surface.

[0009] Preferably, the cover body is arranged corresponding to the second end of the shell, and the edge of the cover body is welded to the second end of the shell.

[0010] Preferably, the maximum outer diameter of the pole is greater than or equal to 15 mm and less than or equal to 30 mm.

[0011] Preferably, the protrusion is connected to the bottom of the pole by threading or laser seam welding.

[0012] Preferably, the pole is connected to the first end of the shell by riveting.

[0013] Preferably, an insulating gasket is provided between the pole and the first current collecting disk.

[0014] Compared with the prior art, the utility model connects the first current collecting disc to the pole by opening a through hole on the pole and extending the protrusion of the first current collecting disc into the through hole. On the one hand, the protrusion can be used in conjunction with the through hole for installation and positioning, and on the other hand, the through hole is used to connect with the side of the protrusion. The connection surface is larger and the connection is more secure, which can meet the requirement of large current flow area of ​​large cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural diagram of the full-ear cylindrical battery of the utility model.

[0016] Figure 2 This is an exploded view of the full-ear cylindrical battery of the utility model.

[0017] Figure 3 This is a three-dimensional structural diagram of the first current collecting disk of the full-ear cylindrical battery of the utility model, and the figure is a structural diagram viewed from the bottom to the top of the cylindrical battery.

[0018] Figure 4 This is a three-dimensional structural diagram of the second current collecting plate of the full-ear cylindrical battery of the utility model, and the figure is a structural diagram viewed from the bottom to the top of the cylindrical battery.

[0019] Figure 5This is a three-dimensional structural diagram of the cover of the full-ear cylindrical battery of the utility model, and the figure is a structural diagram viewed from the bottom to the top of the cylindrical battery.

[0020] Figure 6 It is a cross-sectional structural diagram of a full-ear cylindrical battery of the utility model. DETAILED DESCRIPTION

[0021] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0022] like Figures 1 to 6 As shown, the embodiment of the utility model provides a full-ear cylindrical battery, including a shell 1 with a hollow structure and a cover 2 arranged on the shell 1, the shell 1 has a first end 11 and a second end 12 opposite to the first end 11, a pole 3 is arranged in the middle of the end surface of the first end 11, and the second end 12 is open, and the pole 3 is provided with a through hole 31 along the axial direction of the shell 1, and a bare battery cell 4 is arranged in the shell 1, one end of the bare battery cell 4 is provided with a first full-ear, and the other end of the bare battery cell 4 is provided with a second full-ear. Two full-pole ears, the first full-pole ear is electrically connected to the first current collecting disk 5, and the first current collecting disk 5 is provided with a protrusion 52 corresponding to the through hole 31, the protrusion 52 is embedded in the through hole 31 and is sealed with the bottom of the pole 3; the second full-pole ear is electrically connected to the second current collecting disk 6, and the middle part of the second current collecting disk 6 is also provided with an annular boss 62 protruding toward the second end 12 of the shell 1, the annular boss 62 is connected to the cover body 2 by laser penetration welding, and the cover body 2 is sealed with the second end 12 of the shell 1.

[0023] Specifically, the shell 1 is a single-opening shell, that is, only the second end 12 is open, the first end 11 corresponds to the top of the cylindrical battery, and the second end 12 corresponds to the bottom of the cylindrical battery. The bare cell 4 is a full-pole ear bare cell, and the first full-pole ear and the second full-pole ear are arranged on both sides of the bare cell 4. The pole 3 is riveted to the first end 11 of the shell 1, and the polarity of the pole 3 is opposite to that of the shell 1. A sealing ring 8 is arranged between the pole 3 and the first end face of the shell 1, and an insulating gasket 7 is arranged between the first end face of the shell 1 and the first current collecting disk 5. The utility model connects the first current collecting disk 5 to the pole 3 by opening a through hole 31 on the pole 3 and extending the protrusion 52 of the first current collecting disk 5 into the through hole 31. On the one hand, the protrusion 52 can be used to cooperate with the through hole 31 for installation and positioning, and on the other hand, the through hole 31 is used to connect with the side of the protrusion. The connection surface is larger and the connection is more reliable, which can meet the requirement of a large flow area of ​​a large cylindrical battery.

[0024] In the embodiment of the utility model, a sinking portion 21 recessed toward the annular boss 62 is provided on the cover body 2 corresponding to the annular boss 62, and the annular boss 62 is connected to the sinking portion 21 by laser penetration welding. Specifically, Figure 2 , Figure 5as well as Figure 6 As shown, the sinking portion 21 and the annular boss 62 of the second current collecting disc 6 can be connected by laser welding. By providing the sinking portion 21, the welding position can be marked, welding is more convenient, and the flow area is larger. In some other embodiments, the sinking portion 21 and the annular boss 62 of the second current collecting disc 6 can also be connected and fixed by resistance welding, electromagnetic welding or ultrasonic welding.

[0025] In the embodiment of the utility model, Figure 2 and Figures 4 to 6 As shown, the bare battery cell 4 is provided with a first liquid seepage hole 41 along its axial direction, a second liquid seepage hole 63 is provided in the middle of the annular boss 62, and a liquid injection hole 22 is correspondingly provided in the middle of the sinking part 21. The first liquid seepage hole 41, the second liquid seepage hole 63 and the liquid injection hole 22 are coaxially arranged and interconnected.

[0026] In the embodiment of the utility model, Figures 2 to 3 as well as Figure 6 As shown, the first current collecting disk 5 includes a first disk-shaped body 51 and a protrusion 52 formed by the middle part of the first disk-shaped body 51 protruding outward, the protrusion 52 has a side wall and a bottom wall connected to the side wall, the side wall is connected to the bottom of the pole 3 by laser seam welding, and the first disk-shaped body 51 is welded to the first full-pole ear. Specifically, the first disk-shaped body 51 is also provided with a first welding portion 511 welded to the first full-pole ear, the first welding portion 511 is fan-shaped, and can be three evenly arranged, and a gap is provided on the circumference of the first welding portion 511, the protrusion 52 can be cylindrical, square or polygonal, etc., and the number of the protrusions 52 can be one or more, which can be set according to actual needs.

[0027] In the embodiment of the utility model, the second collecting plate 6 includes a second plate-shaped body 61, a second liquid seepage hole 63 is provided in the middle of the second plate-shaped body 61, and an annular boss 62 extends toward the center thereof to form an annular extension surface 621. Specifically, as Figure 4 As shown, the second disc-shaped body 61 is also provided with a second welding portion 611 welded to the first full-ear, the second welding portion 611 is fan-shaped, and can be three evenly arranged, and a gap is provided on the circumference of the second welding portion 611, and the annular boss 62 can be cylindrical, square or polygonal, etc., and the number of the annular boss 62 can be one or more, which can be set according to actual needs. By setting the annular extension surface 621, the strength of the annular boss 62 can be effectively improved, it is not easy to deform, and the stability is better.

[0028] In the embodiment of the utility model, the cover body 2 is disposed corresponding to the second end 12 of the shell 1, and the edge of the cover body 2 is welded to the second end 12 of the shell 1. Figure 5 to Figure 6As shown, the cover body 2 is circular, and the diameter of the cover body 2 is set to correspond to the inner diameter of the second end 12 of the shell 1. The edge of the cover body 2 is welded to the shell 1 by welding.

[0029] In the embodiment of the utility model, the maximum outer diameter of the pole 3 is greater than or equal to 15 mm and less than or equal to 30 mm.

[0030] In the embodiment of the utility model, the raised portion 52 is connected to the bottom of the pole 3 by laser seam welding. The side wall of the raised portion 52 is connected to the bottom of the pole 3 by laser seam welding, which has a larger flow area and a better connection effect. Of course, in some other embodiments, the raised portion 52 and the bottom of the pole 3 can also be connected by means of threads or the like.

[0031] The assembly method of the full-ear cylindrical battery in the embodiment of the utility model is as follows:

[0032] S1. Wind the bare battery cell 4 and perform flattening / flattening treatment, fix the first full pole ear of the bare battery cell 4 to the first collector plate 5 by laser penetration welding, the welding power is 500W~2000W, and fix the second full pole ear of the bare battery cell 4 to the second collector plate 6 by laser penetration welding, the welding power is 500~2000W.

[0033] S2. Connect the annular boss 62 of the second current collecting plate 6 to the upper sink portion 21 of the cover body 2 by laser penetration welding, with the welding power being 1500W to 4000W.

[0034] S3, installing the above-mentioned connection assembly into the housing 1, and checking the assembly gap between the protrusion 52 of the first collecting plate 5 and the through hole 31 of the pole 3, and the gap between the edge of the cover 2 and the second end 12 of the housing 1.

[0035] S4, connecting the side wall of the protrusion 52 of the first current collecting plate 5 to the through hole 31 of the pole 3 by laser seam welding, with the welding power being 1000W to 3000W;

[0036] S5. Connect the edge of the cover 2 to the second end 12 of the shell 1 by welding.

[0037] It should be noted that, in the actual assembly process, the order of step S4 and step S5 can be swapped.

[0038] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A full-ear cylindrical battery, characterized in that: The invention comprises a shell with a hollow structure and a cover body arranged on the shell, wherein the shell has a first end and a second end opposite to the first end, a pole is arranged in the middle of the end surface of the first end, and the second end is open, and a through hole is opened in the pole along the axial direction of the shell, a bare battery cell is arranged in the shell, a first full-pole ear is arranged at one end of the bare battery cell, and a second full-pole ear is arranged at the other end of the bare battery cell, a first current collecting disk is electrically connected to the first full-pole ear, a protrusion is arranged on the first current collecting disk corresponding to the through hole, and the protrusion is embedded in the through hole and sealed with the bottom of the pole; The second full-pole tab is electrically connected to a second current collecting disk, and a central portion of the second current collecting disk is further provided with an annular boss protruding toward the second end of the shell, the annular boss is laser-penetrated and welded to the cover body, and the cover body is sealed and connected to the second end of the shell.

2. The full-ear cylindrical battery according to claim 1, characterized in that: A sunken platform portion recessed toward the annular boss is provided on the cover body corresponding to the annular boss, and the annular boss is connected to the sunken platform portion by laser penetration welding.

3. The full-ear cylindrical battery according to claim 2, characterized in that: The bare battery cell is provided with a first liquid seepage hole along its axial direction, a second liquid seepage hole is provided in the middle of the annular boss, and a liquid injection hole is correspondingly provided in the middle of the sinking platform part, and the first liquid seepage hole, the second liquid seepage hole and the liquid injection hole are coaxially arranged.

4. The full-ear cylindrical battery according to claim 3, characterized in that: The first current collecting disk includes a first disk-shaped body and a raised portion formed by the middle portion of the first disk-shaped body protruding outward, the raised portion having a side wall and a bottom wall connected to the side wall, the side wall is laser seam welded to the bottom of the pole, and the first disk-shaped body is welded to the first full pole ear.

5. The full-ear cylindrical battery according to claim 4, characterized in that: The second current collecting plate comprises a second plate-shaped body, the middle part of which is provided with the second liquid seepage hole, and the annular boss extends toward the center thereof to form an annular extension surface.

6. The full-ear cylindrical battery according to claim 1, characterized in that: The cover body is arranged corresponding to the second end of the shell, and the edge of the cover body is welded to the second end of the shell.

7. The full-ear cylindrical battery according to claim 1, characterized in that: The maximum outer diameter of the pole is greater than or equal to 15 mm and less than or equal to 30 mm.

8. The full-ear cylindrical battery according to claim 1, characterized in that: The protrusion is connected to the bottom of the pole by threading or laser seam welding.

9. The full-ear cylindrical battery according to claim 1, characterized in that: The pole is connected to the first end of the shell by riveting.

10. The full-ear cylindrical battery according to claim 1, characterized in that: An insulating gasket is arranged between the pole and the first current collecting disk.

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