All-tab cylindrical battery

Abstract

The utility model discloses a full-lug cylindrical battery, which comprises a current collecting plate, the current collecting plate comprises a plate-shaped main body and a connecting part, the connecting part is positioned above the plate-shaped main body and comprises a fixed part, an inclined part and a welding part which are integrally connected, the fixed part is connected with the plate-shaped main body in a welding manner, and the inclined part is obliquely arranged relative to the plate-shaped main body; the welding part is arranged in parallel relative to the disc-shaped main body, the welding part is used for being in welded connection with a cover plate of the cylindrical battery, and the projection of the connecting part in the first direction perpendicular to the disc-shaped main body is located on the inner side of the projection of the disc-shaped main body in the first direction. According to the utility model, after the connecting part and the disc-shaped main body are manufactured separately, the fixed part of the connecting part is fixedly connected with the disc-shaped main body in a welding manner, and the fixed part and the inclined part are bent once, so that the total length of the connecting part is shortened, the resistance of the battery core is reduced, and the battery core is more compact in structure. The available height space is increased, and the energy density of the cylindrical battery is improved.

Description

Technical Field

[0001] The utility model relates to the field of 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 in energy storage battery applications, full-ear collector plate welding mostly adopts the method of bending collector plates. The folding ear method affects the internal space and resistance of the battery cell. The Z-shaped folding collector plate has a long tail that affects the resistance and height space of the battery cell. At the same time, the existing bending collector plate needs to sacrifice the area of ​​the collector plate, which affects the welding area between the collector plate and the full-ear, and increases the resistance of the battery cell. Summary of the invention

[0003] The utility model aims to provide a full-ear cylindrical battery to solve the problems of large resistance and large occupied space in the existing cylindrical battery in the Z-shaped folding mode.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a full-ear tab cylindrical battery, including a current collecting plate, wherein the current collecting plate includes a disc-shaped body and a connecting portion, wherein the connecting portion is located above the disc-shaped body and the connecting portion includes a fixing portion, an inclined portion and a welding portion that are integrally connected, the fixing portion is welded to the disc-shaped body, the inclined portion is inclined relative to the disc-shaped body, the welding portion is parallel to the disc-shaped body, the welding portion is used to be welded to the cover plate of the cylindrical battery, and the projection of the connecting portion in a first direction perpendicular to the disc-shaped body is located on the inner side of the projection of the disc-shaped body in the first direction.

[0005] Preferably, the disc-shaped body includes a first welding area and a second welding area recessed downward from the disc-shaped body, the fixing portion is welded to the first welding area, and the second welding area is used to be welded to the full tab of the bare cell of the cylindrical battery.

[0006] Preferably, the disc-shaped body has a front side connected to the connecting portion, and the first welding area is located in the middle of the front side of the disc-shaped body or the first welding area is located at an edge of the front side of the disc-shaped body.

[0007] Preferably, the fixing portion, the inclined portion and the welding portion are all in a plate shape, and a welding surface of the welding portion facing away from the disc-shaped body is welded to the cover plate.

[0008] Preferably, the welding portion and the inclined portion are formed by bending at one time.

[0009] Preferably, an angle formed by the welding portion and the inclined portion is greater than or equal to 90 degrees and less than or equal to 180 degrees.

[0010] Preferably, the fixing portion is connected to the disc-shaped body by laser welding or ultrasonic welding.

[0011] Preferably, the cylindrical battery comprises a shell, the bare cell disposed in the shell, and the cover plate closing one end of the shell, and the current collecting plate is located between the bare cell and the cover plate.

[0012] Compared with the prior art, the utility model manufactures the connecting part and the disc-shaped main body separately, and fixes the fixing part of the connecting part to the disc-shaped main body by welding, and a bend is formed between the fixing part and the inclined part. The utility model embodiment replaces the two Z-shaped bends with one bend, shortens the total length of the connecting part, reduces the resistance of the battery cell, increases the available height space, and improves the energy density of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the structure of the full-ear cylindrical battery collector disk of the utility model embodiment.

[0014] Figure 2 It is a side structural diagram of a full-ear cylindrical battery collector disk according to an embodiment of the utility model.

[0015] Figure 3 It is a cross-sectional structural diagram of a full-tab cylindrical battery according to an embodiment of the utility model.

[0016] Figure 4 for Figure 3 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0017] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0018] like Figures 1 to 4 As shown, the utility model provides a full-ear cylindrical battery, including a current collecting plate 10, the current collecting plate 10 includes a disc-shaped body 1 and a connecting portion 2, the connecting portion 2 is located above the disc-shaped body 1 and the connecting portion 2 includes a fixing portion 21, an inclined portion 22 and a welding portion 23 that are integrally connected, the fixing portion 21 is welded to the disc-shaped body 1, the inclined portion 22 is inclined relative to the disc-shaped body 1, the welding portion 23 is parallel to the disc-shaped body 1, the welding portion 23 is used to be welded to the cover plate 40 of the cylindrical battery, and the projection of the connecting portion 2 in a first direction perpendicular to the disc-shaped body 1 is located on the inner side of the projection of the disc-shaped body 1 in the first direction.

[0019] Specifically, when manufacturing the cylindrical battery of the present invention, the connecting part 2 and the disc-shaped main body 1 are first manufactured separately, and then the fixing part 21 of the connecting part 2 is fixedly connected to the disc-shaped main body 1 by welding, and then the collecting plate 10 connected with the connecting part 2 is installed inside the shell 20 of the cylindrical battery, and the welding part 23 of the connecting part 2 is welded to the cover plate 40 and the cover plate 40 is pressed onto the shell 20 to close the shell 20. The single bend formed between the fixing part 21 and the inclined part 22 can be formed by pressing the cover plate 40, or it can be pre-made when the connecting part 2 is manufactured. The embodiment of the utility model replaces the two Z-shaped bends with one bend, thereby shortening the total length of the connecting part, reducing the resistance of the battery cell, increasing the available height space, and improving the energy density of the cylindrical battery.

[0020] In the embodiment of the utility model, the disc-shaped body 1 includes a first welding area 11 and a second welding area 12 which is recessed downward from the disc-shaped body 1, the fixing portion 21 is welded to the first welding area 11, and the second welding area 12 is used to be welded to the full-pole ear of the bare cell 30 of the cylindrical battery. Specifically, the cylindrical battery includes a shell 20, a bare cell 30 disposed in the shell 20, and a cover plate 40 which closes one end of the shell 20, the current collecting plate 10 is located between the bare cell 30 and the cover plate 40, the second welding area 12 is evenly distributed, the first welding area 11 is distributed in the area of ​​the disc-shaped body 1 other than the second welding area 12, and the disc-shaped body 1 is also provided with a seepage hole 13 in the area other than the first welding area 11 and the second welding area 12, the first welding area 11, the second welding area 12 and the seepage hole 13 can be reasonably distributed according to actual needs to ensure the welding effect of the current collecting plate 10 with the full-pole ear of the bare cell 30, the welding effect of the current collecting plate 10 with the cover plate 40, and the energy density and other performance of the cylindrical battery. The utility model does not need to sacrifice the welding area of ​​the disc-shaped main body 1, increases the welding area between the disc-shaped main body 1 of the current collecting plate 10 and the full pole ear, and reduces the resistance of the cylindrical battery.

[0021] In the embodiment of the utility model, the disc-shaped body 1 has a front surface connected to the connecting portion 2, and the first welding area 11 is located in the middle of the front surface of the disc-shaped body 1 or the first welding area 11 is located at the edge of the front surface of the disc-shaped body 1. Specifically, the position of the first welding area 11 can be adjusted according to actual needs, and can be located in the middle of the disc-shaped body 1 or at the edge of the disc-shaped body 1. The specific setting position is very flexible, which greatly improves the flexibility of the design of the cylindrical battery and improves the performance of the cylindrical battery.

[0022] In the embodiment of the utility model, the fixing portion 21, the inclined portion 22 and the welding portion 23 are all in the shape of a plate, and the welding surface of the welding portion 23 facing away from the disc-shaped body 1 is welded and connected to the cover plate 40. Specifically, the welding surface of the welding portion 23 facing away from the disc-shaped body 1 is welded and connected to the cover plate 40 to form a single bend, and the welding operation of the welding portion 23 and the cover plate 40 is convenient.

[0023] In the embodiment of the utility model, the welding part 23 and the inclined part 22 are formed by bending once. Specifically, the welding part 23 and the inclined part 22 are formed by bending once through a straight plate, and the connection effect between the welding part 23 and the inclined part 22 is good and easy to operate.

[0024] In the embodiment of the utility model, the angle formed by the welding portion 23 and the inclined portion 22 is greater than or equal to 90 degrees and less than or equal to 180 degrees. Specifically, by setting the angle a between the welding portion 23 and the inclined portion 22 to be greater than 90 degrees, it can be ensured that the bending angle during the process of bending the straight plate into the welding portion 23 and the inclined portion 22 is small, and the bending portion is not prone to fatigue fracture for a long time, and the performance is better.

[0025] In the embodiment of the utility model, the fixing portion 21 is connected to the disc-shaped body 1 by laser welding or ultrasonic welding.

[0026] The embodiment of the utility model adopts one bend to replace the two Z-shaped bends, which reduces the resistance of the cylindrical battery, increases the available height space, and improves the energy density of the cylindrical battery. In addition, the welding position of the connecting part 2 and the disc-shaped main body 1 of the utility model is adjustable, which greatly improves the design flexibility of the cylindrical battery and improves the performance of the cylindrical battery.

[0027] 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: It includes a current collecting plate, which includes a disc-shaped body and a connecting portion, wherein the connecting portion is located above the disc-shaped body and includes a fixing portion, an inclined portion and a welding portion that are integrally connected, the fixing portion is welded to the disc-shaped body, the inclined portion is inclined relative to the disc-shaped body, the welding portion is parallel to the disc-shaped body, the welding portion is used to be welded to the cover plate of the cylindrical battery, and the projection of the connecting portion in a first direction perpendicular to the disc-shaped body is located on the inner side of the projection of the disc-shaped body in the first direction.

2. The full-ear cylindrical battery according to claim 1, characterized in that: The disc-shaped body includes a first welding area and a second welding area recessed downward from the disc-shaped body, the fixing portion is welded to the first welding area, and the second welding area is used for welding to the full tab of the bare cell of the cylindrical battery.

3. The full-ear cylindrical battery according to claim 2, characterized in that: The disk-shaped body has a front side connected to the connecting portion, and the first welding area is located in the middle of the front side of the disk-shaped body or the first welding area is located at the edge of the front side of the disk-shaped body.

4. The full-ear cylindrical battery according to claim 1, characterized in that: The fixing portion, the inclined portion and the welding portion are all in the shape of a plate, and a welding surface of the welding portion facing away from the disc-shaped body is welded to the cover plate.

5. The full-ear cylindrical battery according to claim 4, characterized in that: The welding portion and the inclined portion are formed by bending at one time.

6. The full-ear cylindrical battery according to claim 5, characterized in that: An angle formed by the welding portion and the inclined portion is greater than or equal to 90 degrees and less than or equal to 180 degrees.

7. The full-ear cylindrical battery according to claim 1, characterized in that: The fixing portion is connected to the disc-shaped body by laser welding or ultrasonic welding.

8. The full-ear cylindrical battery according to claim 2, characterized in that: The cylindrical battery comprises a shell, the bare cell arranged in the shell, and the cover plate closing one end of the shell, and the current collecting plate is located between the bare cell and the cover plate.

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