Cylindrical rechargeable battery body

Abstract

The utility model discloses a cylindrical rechargeable battery main body. The cylindrical rechargeable battery main body comprises a shell, a roll core and a collector plate, the roll core is located in the shell, and the flow collecting disc is located in the shell and arranged between the roll core and the shell bottom of the shell. The current collecting disc comprises a connecting part, a first welding part and a second welding part, the first welding part and the second welding part are arranged in a stacked mode, the second welding part is welded to the roll core, the first welding part is welded to the shell bottom of the shell, and the connecting part is connected with the first welding part and the second welding part. And the second welding part is connected with the first welding part through the connecting part. Therefore, by means of the first welding part and the second welding part which are arranged in a stacked mode, when the shell bottom of the shell and the first welding part are welded together through penetration welding, the second welding part plays a role in protecting the roll core so as to prevent the roll core from being burnt, so that the risk of short circuit of the cylindrical rechargeable battery main body due to the burn of the roll core is avoided.

Description

Technical Field

[0001] The utility model relates to a battery as a power source, and particularly to a cylindrical rechargeable battery body. Background Art

[0002] With the booming development of the new energy industry, it provides a huge market for the battery industry, thus accelerating the development pace of the battery industry.

[0003] Currently, for lithium-ion cylindrical batteries, due to their advantages such as high energy density, increased charge-discharge rate, and good capacity consistency, they have gradually become the mainstream products in the new energy industry. Since the full pole ear / current collector plate has been selected as the preferred direction of the cylindrical battery structure by more and more manufacturers, the welding of the current collector plate to the bottom of the steel shell is even more important, but the common problems are as follows:

[0004] (1) Due to the increase in the charge-discharge rate of the battery and the complex application scenarios, and the traditional resistance welding is used for welding the current collector plate to the bottom of the steel shell, there are defects such as small welding area and easy open circuit due to vibration, which are difficult to meet the current market demand.

[0005] (2) In order to reduce the manufacturing cost, the current collector plate is made thinner and thinner, and its thickness range is 0.15 mm to 0.3 mm; however, the thickness range of the bottom of the steel shell is 0.3 mm to 0.6 mm, which is thicker than the current collector plate; when using laser penetration welding to weld through the bottom of the steel shell from the outside and weld it to the current collector plate, at this time, it is easy to weld through the current collector plate (it is easy to weld through when welding from thick to thin), thus damaging the wound core and causing a short circuit of the battery.

[0006] Therefore, there is an urgent need for a cylindrical rechargeable battery body to overcome one or more of the above defects. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a cylindrical rechargeable battery body to prevent the wound core from being burned and avoid the risk of short circuit in penetration welding.

[0008] To achieve the above purpose, the cylindrical rechargeable battery body of the utility model includes a housing, a wound core, and a current collector plate. The wound core is located inside the housing, and the current collector plate is located inside the housing and is disposed between the wound core and the bottom of the housing along the height direction of the housing. Among them, the current collector plate includes a connecting portion and a first welding portion and a second welding portion that are stacked along the height direction of the housing. The second welding portion is welded to the wound core, the first welding portion is welded to the bottom of the housing, and the connecting portion is respectively connected to the first welding portion and the second welding portion, so that the second welding portion is connected to the first welding portion through the connecting portion.

[0009] Compared with the prior art, with the design of "the first welding part and the second welding part arranged in layers along the height direction of the outer shell", when the bottom of the shell and the first welding part are welded together by penetration welding, the second welding part plays a role in protecting the winding core to prevent the winding core from being burned, thereby avoiding the short - circuit risk of the cylindrical rechargeable battery body of the present utility model due to the burning of the winding core. In addition, the first welding part and the second welding part arranged in layers are connected together by a connecting part, so that the current collector plate has a buffering effect in the height direction of the outer shell, thereby ensuring the reliability of the welding of the current collector plate to the winding core and the bottom of the shell respectively.

[0010] Preferably, the first welding part and the second welding part are arranged in spaced - apart layers along the height direction of the outer shell, and the connecting part is connected to one side of each of the first welding part and the second welding part, so that the first welding part, the connecting part and the second welding part jointly define a "U" - shaped gap space.

[0011] Preferably, each of the first welding part and the second welding part is a sheet - like structure, and the connecting part is a semi - circular ring structure.

[0012] Preferably, each of the first welding part and the second welding part is a rectangular sheet - like structure, the length direction of the first welding part is perpendicular to the length direction of the second welding part, the connecting part is connected to a short side of the first welding part and a long side of the second welding part respectively, and both short sides of the second welding part are arc - shaped edges.

[0013] Preferably, a protruding part protrudes vertically from a long side of the second welding part, the end of the protruding part is connected to the connecting part, and the first welding part is also arranged in spaced - apart layers along the height direction of the outer shell with the protruding part.

[0014] Preferably, the protruding part vertically bisects the long side of the second welding part, the short - side dimension of the first welding part is smaller than the long - side dimension of the second welding part, and the long - side dimension of the first welding part is larger than the short - side dimension of the second welding part.

[0015] Preferably, the protruding part and the second welding part together form a "T" - shaped structure.

[0016] Preferably, the area of the end face of the second welding part facing away from the first welding part is larger than the area of the end face of the first welding part facing away from the second welding part.

[0017] Preferably, the end face of the first welding part facing away from the second welding part is a plane, and the end face of the second welding part facing away from the first welding part is a plane.

[0018] Preferably, the outer shell is a circular outer shell, the winding core is a wound core, a central channel is provided at the center of the wound core, and the second welding portion covers the end of the central channel. Description of the Drawings

[0019] Figure 1 is a perspective view of the cylindrical rechargeable battery body of the present utility model.

[0020] Figure 2 is Figure 1 a plan view of the cylindrical rechargeable battery body shown in the opposite direction of the arrow A.

[0021] Figure 3 is along Figure 2 the internal view taken along the cutting line B-B in

[0022] Figure 4 is Figure 1 a perspective exploded view of the cylindrical rechargeable battery body shown.

[0023] Figure 5 is Figure 4 a perspective exploded view at another angle.

[0024] Figure 6 is a perspective view of the current collector plate in the cylindrical rechargeable battery body of the present utility model.

[0025] Figure 7 is Figure 6 a perspective view at another angle.

[0026] Figure 8 is Figure 7 a plan view viewed from top to bottom.

[0027] Figure 9 is Figure 7 a plan view viewed from left to right. Detailed Description of the Embodiment

[0028] Now, embodiments of the present utility model will be described with reference to the accompanying drawings, in which like reference numerals represent like elements.

[0029] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5, the cylindrical rechargeable battery body 100 of the present utility model includes a housing 10, a winding core 20 and a current collector plate 30. Optionally, as an example, the housing 10 is a steel shell so that the housing 10 has sufficient compressive strength. Additionally, the housing 10 is a circular housing so that the shape of the cylindrical rechargeable battery body 100 of the present utility model is cylindrical. Obviously, according to actual needs, the housing 10 can also be other metal housings. At the same time, the shape of the housing 10 can also be square, etc., which is well known in the art and will not be elaborated here.

[0030] At the same time, the winding core 20 is located inside the housing 10. Optionally, as an example, the winding core 20 is a wound core so that there is a central channel 21 at the center of the winding core 20. Before welding the current collector plate 30 to the bottom 11 of the housing 10, an external ejector pin can come along the central channel 21 of the winding core 20 to the position where the current collector plate 30 is pushed, so that the bottom 11 of the housing 10 and the current collector plate 30 are kept in a pressed state, so that the first welding part 32 between the bottom 11 and the current collector plate 30 is closely attached, thus avoiding the operation method of keeping the bottom 11 of the housing 10 and the current collector plate 30 in a pressed state by pushing the winding core 20. Obviously, according to actual needs, the winding core 20 can also be made into a folded core, so it is not limited Figures 1 to 5 as shown.

[0031] Furthermore, the current collector plate 30 is located inside the housing 10, and the current collector plate 30 is also placed between the winding core 20 and the bottom 11 of the housing 10 along the height direction of the housing 10 (see the direction indicated by arrow A), and the state is shown in Figure 3 as shown. The current collector plate 30 includes a connecting part 31 and a first welding part 32 and a second welding part 33 arranged in layers along the height direction of the housing 10. The second welding part 33 is welded to the winding core 20 (referring to welding with the tab in the winding core 20, such as but not limited to the full tab). The first welding part 32 is welded to the bottom 11 of the housing 10. The connecting part 31 is connected to the first welding part 32 and the second welding part 33 respectively, so that the second welding part 33 is connected to the first welding part 32 by means of the connecting part 31. It should be noted that when the winding core 20 is a wound core, at this time, the second welding part 33 also covers the end of the central channel 21 of the winding core 20, and the state is shown in Figure 3 as shown, such a design is convenient for an external ejector pin to come along the central channel 21 to the position where the second welding part 33 is pushed, so as to facilitate the operation of the external ejector pin pushing the second welding part 33. More specifically, as follows:

[0032] As Figure 3 and Figure 9As shown, as an example, the first welding part 32 and the second welding part 33 are arranged in a spaced-apart and stacked manner along the height direction of the housing 10. Such a design makes the first welding part 32 not in contact with the second welding part 33 in the height direction of the housing 10. Therefore, during the process of welding the bottom 11 of the housing 10 to the first welding part 32 by penetration welding, the heat acting on the first welding part 32 during penetration welding is effectively reduced from being transferred to the second welding part 33, so that the second welding part 33 can more effectively play a role in protecting the core 20 to prevent the core 20 from being burned. In addition, the connecting part 31 is connected to one side of each of the first welding part 32 and the second welding part 33. Such a design makes the first welding part 32, the connecting part 31, and the second welding part 33 jointly define a gap space 34 in the shape of a "U", as shown in Figure 3 and Figure 9 shown. Therefore, by means of the design that "the connecting part 31 is connected to one side of each of the first welding part 32 and the second welding part 33", the current collector plate 30 can be manufactured by bending the sheet metal, thus simplifying the manufacturing process of the current collector plate 30.

[0033] For another example Figure 3 and Figure 9 shown, as an example, the first welding part 32 and the second welding part 33 are each in a sheet-like structure, and the connecting part 31 is in a semi-circular ring structure. Such a design simplifies the process of manufacturing the current collector plate 30 by bending the sheet-like sheet metal. Specifically, in combination with Figure 6 and Figure 7 , as an example, the first welding part 32 and the second welding part 33 are each in a rectangular sheet-like structure, and the length direction of the first welding part 32 is perpendicular to the length direction of the second welding part 33 to effectively reduce the overlapping area of the projections of the first welding part 32 and the second welding part 33 in the height direction of the housing 10, thereby more effectively reducing the heat acting on the first welding part 32 during penetration welding from being transferred to the second welding part 33. In addition, the connecting part 31 is connected to a short side 322 of the first welding part 32 and a long side 331 of the second welding part 33 respectively. Both short sides 332 of the second welding part 33 are arc-shaped edges, and the arc-shaped edges enable the second welding part 33 to better match the housing 10, so that the second welding part 33 is made more compact with the housing 10 in the radial direction of the housing 10.

[0034] Among them, to make the manufacturing of the current collector plate 30 easier, in Figures 6 to 8 , as an example, a protruding part 35 protrudes vertically from a long side 331 of the second welding part 33, and the end of the protruding part 35 is connected to the connecting part 31. The first welding part 32 is also arranged in a spaced-apart and stacked manner along the height direction of the housing 10 with the protruding part 35, as shown in Figure 9 shown; this can effectively reduce the bending resistance of manufacturing the current collector plate 30 by bending the sheet metal. Optionally, inFigure 8 In this case, as an example, the protruding portion 35 perpendicularly bisects the long side 331 of the second welding portion 33, so as to offset the protruding portion 35 and the first welding portion 32 both towards the center of the second welding portion 33; in addition, the dimension D2 of the short side 322 of the first welding portion 32 is smaller than the dimension P1 of the long side 331 of the second welding portion 33, and the dimension D1 of the long side 321 of the first welding portion 32 is larger than the dimension P2 of the short side 332 of the second welding portion 33, that is to say, the dimension D1 of the long side 321 of the first welding portion 32 is equal to the sum of the dimension P2 of the short side 332 of the second welding portion 33 and the protruding dimension D3 of the protruding portion 35; furthermore, the protruding portion 35 and the second welding portion 33 together form a "T" - shaped structure.

[0035] Combined with Figures 6 to 8 , as an example, the area of the end face 333 of the second welding portion 33 facing away from the first welding portion 32 is larger than the area of the end face 323 of the first welding portion 32 facing away from the second welding portion 33, so as to meet the requirement that the welding area between the first welding portion 32 and the bottom 11 of the housing 10 is smaller than the welding area between the second welding portion 33 and the winding core 20. Specifically, in Figure 9 , as an example, the end face 323 of the first welding portion 32 facing away from the second welding portion 33 is a plane, so that before the first welding portion 32 is welded to the bottom 11 of the housing 10, the first welding portion 32 and the bottom 11 of the housing 10 maintain a planar abutting state, thereby ensuring the reliability of welding; in addition, the end face 333 of the second welding portion 33 facing away from the first welding portion 32 is a plane, so that before the second welding portion 33 is welded to the winding core 20, the second welding portion 33 and the winding core 20 maintain a planar abutting state, thereby ensuring the reliability of welding.

[0036] Compared with the prior art, by means of such a design of "the first welding portion 32 and the second welding portion 33 arranged in layers along the height direction of the housing 10", when the bottom 11 of the housing 10 and the first welding portion 32 are welded together by penetration welding, the second welding portion 33 plays a role in protecting the winding core 20 to prevent the winding core 20 from being burned, thereby avoiding the short - circuit risk of the cylindrical rechargeable battery body 100 of the present utility model due to the burning of the winding core 20. In addition, the first welding portion 32 and the second welding portion 33 arranged in layers are connected together by the connecting portion 31, so that the current - collecting plate 30 has a buffering effect in the height direction of the housing 10, and further ensures the reliability of the welding of the current - collecting plate 30 to the winding core 20 and the bottom 11 respectively.

[0037] It should be noted that on the basis of the cylindrical rechargeable battery body 100 of the present utility model, a cover body, an explosion-proof valve and electrolyte are further configured to form a complete battery product. Additionally, the aforementioned wound core refers to a core obtained by a winding method, and the aforementioned folded core refers to a core manufactured by a folding method. Furthermore, the current collector plate 30 is not limited to a disc shape and can be in a strip shape or the like according to actual needs.

[0038] The foregoing disclosure is only the preferred embodiment of the present utility model, and of course it cannot be used to limit the scope of rights of the present utility model. Therefore, equivalent changes made according to the scope of the patent application of the present utility model still fall within the scope covered by the present utility model.

Claims

1. A cylindrical rechargeable battery body, comprising a shell, a winding core and a current collecting plate, wherein the winding core is located in the shell, and the current collecting plate is located in the shell and is placed between the winding core and the shell bottom along the height direction of the shell, characterized in that: The collecting plate includes a connecting portion and a first welding portion and a second welding portion which are stacked along the height direction of the outer shell, the second welding portion is welded to the winding core, the first welding portion is welded to the shell bottom of the outer shell, and the connecting portion is respectively connected to the first welding portion and the second welding portion, so that the second welding portion is connected to the first welding portion by means of the connecting portion.

2. The cylindrical rechargeable battery body according to claim 1, characterized in that: The first welding portion is arranged in a stacked manner with the second welding portion separated from each other along the height direction of the shell, and the connecting portion is connected to one side of the first welding portion and the second welding portion respectively, so that the first welding portion, the connecting portion and the second welding portion together define a gap space in the shape of a "コ" character.

3. The cylindrical rechargeable battery body according to claim 2, characterized in that: The first welding portion and the second welding portion are each a sheet-like structure, and the connecting portion is a semicircular ring structure.

4. The cylindrical rechargeable battery body according to claim 3, characterized in that: The first welding part and the second welding part are each a rectangular sheet structure, the length direction of the first welding part is arranged perpendicular to the length direction of the second welding part, the connecting part is respectively connected to a short side of the first welding part and a long side of the second welding part, and the two short sides of the second welding part are both arc sides.

5. The cylindrical rechargeable battery body according to claim 4, characterized in that: A protruding portion protrudes vertically from one long side of the second welding portion, a terminal end of the protruding portion is connected to the connecting portion, and the first welding portion is also arranged in a stacked manner with the protruding portion spaced apart along the height direction of the housing.

6. The cylindrical rechargeable battery body according to claim 5, characterized in that: The protruding portion perpendicularly bisects the long side of the second welding portion, the short side of the first welding portion is smaller than the long side of the second welding portion, and the long side of the first welding portion is larger than the short side of the second welding portion.

7. The cylindrical rechargeable battery body according to claim 5, characterized in that: The protruding portion and the second welding portion together form a "T"-shaped structure.

8. The cylindrical rechargeable battery body according to claim 2, characterized in that: An area of ​​an end surface of the second welding portion facing away from the first welding portion is larger than an area of ​​an end surface of the first welding portion facing away from the second welding portion.

9. The cylindrical rechargeable battery body according to claim 8, characterized in that: An end surface of the first welding portion facing away from the second welding portion is a plane, and an end surface of the second welding portion facing away from the first welding portion is a plane.

10. The cylindrical rechargeable battery body according to claim 1, characterized in that: The shell is a circular shell, the core is a winding core, a center channel is provided at the center of the winding core, and the second welding portion covers the end of the center channel.

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