Collector plate for power battery and power battery

Abstract

The collector plate comprises a plate body, the plate body is configured to be welded with a full tab of a roll core, the plate body extends towards one side to form an extension handle, one end, far away from the plate body, of the extension handle is provided with an annular embossed welding area, and the annular embossed welding area is arranged on the plate body. And the annular embossed welding area is configured to be welded with a weldable area on the bottom surface of the pole. Due to the fact that the annular embossed welding area can play a role of a reinforcing rib, the surface tension of the welding area of the extension handle can be enhanced, and the situation that insufficient welding occurs during laser welding due to poor attachment can be effectively avoided. And moreover, the knurling of the annular knurling welding area can reduce the occurrence of laser welding light reflection, the energy absorption of laser welding and the consistency / stability of the welding penetration depth are improved, and the problem of insufficient welding caused by light reflection is effectively avoided. Besides, during laser welding, namely welding the extension handle and the weldable area on the bottom surface of the pole, the weldable area on the bottom surface of the pole can be directly distinguished through the annular embossed welding area.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a current collector for a power battery and a power battery. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical power batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers are beginning to focus on improving the production capacity and yield control of cylindrical power batteries. However, current products have the following common problems:

[0003] 1. With the mass production of cylindrical power batteries, attempts have been made to reduce the thickness of the current collector to reduce costs. However, when the thinner extension stalk is welded to the bottom of the terminal post, poor adhesion can easily lead to incomplete welding.

[0004] 2. When the extension shank of the collector plate is laser welded to the bottom surface of the electrode post, high reflection (i.e., glare) is likely to occur, resulting in poor energy absorption by the material and causing incomplete welding.

[0005] 3. When laser welding the collector plate and the electrode base, it is sometimes necessary to identify the weldable area on the bottom surface of the electrode (some areas are too thin and need to be avoided). The extension shank rests on the electrode base, and it is not possible to visually identify the weldable area of ​​the base during laser welding, which causes trouble for the production process. Utility Model Content

[0006] The purpose of this utility model is to provide a current collector for a power battery and a power battery, which can solve at least one of the technical problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides a current collector for a power battery. The current collector includes a disk body, which is configured to be welded to the full tabs of a winding core. An extension shank extends from one side of the disk body, and an annular embossed welding area is provided at the end of the extension shank away from the disk body. The annular embossed welding area is configured to be welded to a weldable area on the bottom surface of the terminal post.

[0008] Optionally, the annular embossed welding area includes a plurality of embossings, which are arranged in at least one ring.

[0009] Optionally, the embossing is circular or square.

[0010] Optionally, the height of the embossed protrusion extending beyond the surface of the extended handle is 0.05 mm to 0.3 mm.

[0011] Optionally, the annular embossed welding area includes a first annular embossed welding area and a second annular embossed welding area, the second annular embossed welding area surrounding the first annular embossed welding area, the first annular embossed welding area including a plurality of first embossings arranged in a circle, and the second annular embossed welding area including a plurality of second embossings arranged in a circle.

[0012] Optionally, both the first annular embossed welding area and the second annular embossed welding area are circular and concentrically arranged.

[0013] Optionally, the first embossing is smaller than the second embossing.

[0014] Optionally, a laser positioning part is provided at the end of the extension handle away from the disk body, and the annular embossing area is arranged around the laser positioning part.

[0015] Optionally, the laser positioning part is a positioning hole or a positioning groove.

[0016] To achieve the above objectives, this utility model provides a power battery, including the current collector for the power battery as described above.

[0017] In this embodiment of the invention, at least one annular embossed welding area is provided at the end of the extension shank away from the disc body. This annular embossed welding area is configured to weld with the weldable area on the bottom surface of the electrode post. Since the annular embossed welding area acts as a reinforcing rib, it enhances the surface tension of the welding area of ​​the extension shank, effectively preventing incomplete welds caused by poor fit during laser welding. Furthermore, the embossing of the annular embossed welding area reduces laser welding reflections, improving energy absorption and the consistency / stability of weld penetration, effectively avoiding incomplete welds caused by reflections. Additionally, during laser welding, specifically when welding the extension shank to the weldable area on the bottom surface of the electrode post, the weldable area on the bottom surface of the electrode post can be directly identified through the annular embossed welding area. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the collector disk in an embodiment of this utility model.

[0019] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the collector plate from another perspective of an embodiment of this utility model.

[0021] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0022] Figure 5 This is a partial structural cross-sectional schematic diagram of the collector disk in an embodiment of this utility model.

[0023] Figure 6 This is a partial structural schematic diagram of the collector plate from another perspective of this utility model embodiment.

[0024] Figure 7 This is a partial cross-sectional view of the collector plate in an embodiment of this utility model.

[0025] Figure 8 This is a schematic diagram of the electrode welding of the collector plate and the top cover assembly in an embodiment of this utility model.

[0026] Figure 9 This is a cross-sectional structural diagram of the electrode post welding of the collector plate and top cover assembly in an embodiment of this utility model.

[0027] Figure 10 yes Figure 9 Enlarged view of section C. Detailed Implementation

[0028] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] Please see Figures 1 to 10 This utility model discloses a current collector 1 for a power battery. The current collector 1 includes a disk body 10, which is configured to be welded to the full tabs of a winding core (not shown). An extension shank 20 extends from one side of the disk body 10. At least one annular embossed soldering area 21 is provided at the end of the extension shank 20 away from the disk body 10. The annular embossed soldering area 21 is configured to be welded to the weldable area 31 on the bottom surface of the terminal post 30. Specifically, the terminal post 30 is a component of the top cover assembly 3, but is not limited to this.

[0031] In this embodiment of the invention, at least one annular embossed welding area 21 is provided at the end of the extension shank 20 away from the disc body 10. The annular embossed welding area 21 is configured to weld with the weldable area 31 on the bottom surface of the pole post 30. Since the annular embossed welding area 21 can act as a reinforcing rib, it can enhance the surface tension of the welding area of ​​the extension shank 20, effectively avoiding the situation of incomplete welding during laser welding due to poor fit. Moreover, the embossing of the annular embossed welding area 21 can reduce the occurrence of laser welding reflection, improve the energy absorption of laser welding and the consistency / stability of welding penetration, and effectively avoid the problem of incomplete welding caused by reflection. In addition, when performing laser welding, that is, when welding the extension shank 20 and the weldable area 31 on the bottom surface of the pole post 30, the weldable area 31 on the bottom surface of the pole post 30 can be directly identified through the annular embossed welding area 21.

[0032] In some embodiments, the annular embossed soldering area 21 includes a plurality of embossing patterns 211, which are arranged in at least one ring. That is, the annular embossed soldering area 21 may include one ring of embossing patterns 211 or more than one ring of embossing patterns 211.

[0033] Specifically, embossed pattern 211 is round or square. However, it is not limited to this.

[0034] Specifically, the height h of the protrusion 2111 extending beyond the surface of the extension handle 20 of the embossing 211 is 0.05 mm to 0.3 mm.

[0035] Specifically, the annular embossed welding area 21 is circular in shape. However, it is not limited to this.

[0036] In some embodiments, the annular embossed soldering area 21 includes a first annular embossed soldering area 212 and a second annular embossed soldering area 213, with the second annular embossed soldering area 213 surrounding the first annular embossed soldering area 212. The first annular embossed soldering area 212 includes a plurality of first embossing patterns 211a (inner ring embossing) arranged in a circle, and the second annular embossed soldering area 213 includes a plurality of second embossing patterns 211b (outer ring embossing) arranged in a circle. Of course, the annular embossed soldering area 21 is not limited to including two rings of embossing.

[0037] Specifically, both the first annular embossed soldering area 212 and the second annular embossed soldering area 213 are circular and concentrically arranged. However, this is not a limitation.

[0038] Specifically, both the first embossing 211a and the second embossing 211b are circular. However, this is not a limitation.

[0039] Specifically, the first embossing 211a is smaller than the second embossing 211b. However, this is not a limitation.

[0040] In a specific example, the outer diameter of the annular embossed welding area 21 formed by the two embossed rings is D, and the inner diameter is d. The annular embossed welding area 21 is the area between the outer diameter circle and the inner diameter circle. Both the outer diameter D and the inner diameter d are preset based on the weldable area 31 on the bottom surface of the pole post 30.

[0041] In some embodiments, a laser positioning part 22 is provided at the end of the extension handle 20 away from the disk body 10, and an annular embossing welding area 21 is arranged around the laser positioning part 22. By providing the laser positioning part 22, the laser can be positioned through the laser positioning part 22 during laser welding.

[0042] Specifically, the laser positioning part 22 is a positioning hole or a positioning groove.

[0043] In some embodiments, a recessed solder area 11 is formed on the disk body 10, and the recessed solder area 11 is configured to be soldered to the full-pole tab at one end of the winding core.

[0044] Specifically, the number of sinking weld zones 11 is at least two.

[0045] In some embodiments, the manifold 1 is made of copper or nickel-plated copper. However, this is not a limitation.

[0046] Please see Figures 1 to 10 This utility model embodiment also discloses a power battery, including a current collector 1 as described above. Typically, the current collector 1 is first welded to the full tabs of the winding core using a recessed welding area 11, and then welded to the terminal post 30, which is usually a component of the top cover assembly 3. After the current collector 1 and the terminal post 30 are welded, the top cover assembly 3 is flipped over, causing the extension handle 20 to bend, and the top cover assembly 3 is then closed to the power battery casing (not shown).

[0047] To facilitate understanding of this utility model, a brief description of the implementation method is provided in conjunction with the accompanying drawings:

[0048] First, based on the relative position of the collector plate 1 and the bottom surface of the pole post 30, and the weldable area 31 of the bottom surface of the pole post 30, a positioning hole or positioning groove is provided at the corresponding end of the extension handle 20 of the collector plate 1, and an annular embossed welding area 21 is provided around the positioning hole or positioning groove.

[0049] Next, based on the range of the annular embossed area 21, the dimensions of the first embossing 211a located in the inner ring and the second embossing 211b located in the outer ring are determined.

[0050] During assembly, the extension shank 20 of the collector plate 1 and the pole post 30 are aligned relative to each other, and the annular embossed soldering area 21 is attached to the bottom surface of the pole post 30. The laser is positioned through the positioning hole or positioning groove, and the weldable area 31 is directly identified in the annular embossed soldering area 21, thus solving the problem of difficulty in identifying the weldable area 31 on the bottom surface of the pole post 30.

[0051] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A current collector for a power battery, characterized in that, The current collector includes a disk body configured to be welded to the full tab of the winding core. The disk body extends to one side with an extension shank. An annular embossed welding area is provided at the end of the extension shank away from the disk body. The annular embossed welding area is configured to be welded to a weldable area on the bottom surface of the pole post.

2. The current collector for a power battery according to claim 1, characterized in that, The annular embossed welding area includes several embossed patterns, which are arranged in at least one ring.

3. The current collector for a power battery according to claim 2, characterized in that, The embossed pattern is round or square.

4. The current collector for a power battery according to claim 2, characterized in that, The height of the embossed protrusion extending beyond the surface of the extension handle is 0.05mm to 0.3mm.

5. The current collector for a power battery according to claim 1, characterized in that, The annular embossed welding area includes a first annular embossed welding area and a second annular embossed welding area. The second annular embossed welding area surrounds the first annular embossed welding area. The first annular embossed welding area includes a plurality of first embossed patterns arranged in a circle in sequence. The second annular embossed welding area includes a plurality of second embossed patterns arranged in a circle in sequence.

6. The current collector for a power battery according to claim 5, characterized in that, Both the first annular embossed welding area and the second annular embossed welding area are circular and concentrically arranged.

7. The current collector for a power battery according to claim 5 or 6, characterized in that, The first embossing is smaller than the second embossing.

8. The current collector for a power battery according to claim 1, characterized in that, A laser positioning part is provided at the end of the extension handle away from the disk body, and the annular embossed soldering area is arranged around the laser positioning part.

9. The current collector for a power battery according to claim 8, characterized in that, The laser positioning part is a positioning hole or a positioning groove.

10. A power battery, characterized in that, Includes the current collector for a power battery as described in any one of claims 1 to 9.

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