A preparation process of composite electrode column and composite electrode column

Abstract

A preparation process for a composite electrode column and a composite electrode column, the preparation process comprising the following steps: processing a pole body (2) of a first material and a sheet (1) of a second material by cold forging respectively; embedding the sheet into a receiving cavity (23) at the end of the pole body; stamping or rolling so that the side of the receiving cavity is plastically deformed and the sheet is riveted together with the pole body, thereby obtaining the composite electrode column. The composite electrode column comprises: a pole body (2) of a first material and a sheet (1) of a second material, the end of the pole body being formed with a receiving cavity (23), the sheet being embedded in the receiving cavity, and the bottom, side, and top edges of the sheet being tightly fitted with the pole body. This process has high production efficiency, and the composite electrode column obtained will not break, and has high safety.

Description

Technical Field

[0001] The invention relates to an electrode column for a battery cell and a preparation process thereof, in particular to a preparation process of a composite electrode column and the composite electrode column. Background Art

[0002] New energy power batteries are widely used. Most of the electrode columns of this type of battery adopt a composite structure, usually a copper sheet is composited on the end of the aluminum pole body. At present, the preparation process of this type of composite electrode column is friction welding, that is, the aluminum pole body is heated and melted under high-speed rotation and welded to the copper sheet. This process has the following technical defects: 1. Due to the oil, uncleanness or oxidation problems on the surface of the object to be welded, false welding is prone to occur, and the false welding phenomenon is difficult to detect. These lead to the risk of fracture of the composite electrode column obtained by this process, which in turn affects the safety of the entire battery cell. 2. After friction welding, the machine tool needs to be reprocessed to correct the deformation caused by the heating of the aluminum pole body during friction welding, which leads to an increase in the cost of the product. Summary of the invention

[0003] The purpose of the present invention is to provide a preparation process of a composite electrode column and a composite electrode column to solve the above-mentioned defects in the prior art.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A preparation process of a composite electrode column comprises the following steps:

[0006] A pole body made of a first material and a sheet body made of a second material are respectively processed by a cold forging process;

[0007] embedding the sheet into the accommodating cavity at the end of the pole body; and

[0008] The side of the accommodating cavity is plastically deformed by stamping or rolling, so that the sheet and the pole body are riveted together, and the bottom, side, and top edges of the sheet are tightly fitted with the pole body, thereby manufacturing the composite electrode column.

[0009] In the above-mentioned process for preparing the composite electrode column, preferably, the first material is aluminum, and the second material is copper.

[0010] In the above-mentioned process for preparing the composite electrode column, preferably, the thickness of the sheet is 0.8-1.2 mm, the diameter is 13-18 mm, and the height of the electrode column body is 8-12 mm.

[0011] In the above-mentioned process for preparing the composite electrode column, preferably, the periphery of the top of the sheet body is sunken to form a lip, and the side of the accommodating cavity extends inwardly to cover the lip.

[0012] The present invention provides a composite electrode column comprising:

[0013] A pole body made of a first material, wherein an accommodating cavity is formed at an end of the pole body; and

[0014] A sheet body made of the second material is embedded in the accommodating cavity, and the bottom, side, and top periphery of the sheet body are tightly fitted with the pole body.

[0015] In the above-mentioned composite electrode column, preferably, the periphery of the top of the sheet body is sunken to form a lip, and the side of the accommodating cavity extends inwardly and covers the lip.

[0016] In the above-mentioned composite electrode column, preferably, the electrode column body has a rod portion and a head portion, the head portion is in a flat plate shape, the head portion is located at one end of the rod portion, and the accommodating cavity is formed at the upper end of the head portion.

[0017] In the above-mentioned composite electrode column, preferably, the sheet has a thickness of 0.8-1.2 mm and a diameter of 13-18 mm, the height of the electrode column body is 8-12 mm, the diameter of the head is 16-22 mm and the thickness is 1.5-2.5 mm.

[0018] In the above composite electrode column, the first material can be aluminum, copper or other metals, and the second material can be copper, aluminum or other metals, but the first material and the second material are different. Preferably, the first material is aluminum, and the second material is copper.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] Since the composite electrode is riveted and multiple surfaces of the sheet (including the bottom, side and top edges) are tightly fitted with the electrode body, the composite electrode column will not break and has high safety.

[0021] The production efficiency is high, which can reach 1.2 seconds per piece, while friction welding generally takes about 15 seconds per piece. At the same time, since riveting composite will not cause thermal deformation in friction welding, the post-processing process is reduced, which can effectively improve efficiency and reduce costs. Specifically, the present invention can reach 5 seconds per piece, while the post-processing of friction welding requires 20 seconds per piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional diagram of the composite electrode column of the first embodiment;

[0023] Figure 2 This is a process flow chart of preparing the composite electrode column of the first embodiment;

[0024] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0025] Figure 4 is a three-dimensional diagram of a composite electrode column according to a second embodiment;

[0026] Figure 5 is a process flow chart of preparing the composite electrode column of the second embodiment;

[0027] Figure 6 for Figure 5 Enlarged view of middle part B;

[0028] Figure numerals: 1, sheet body; 11, lip; 2, pole body; 21, rod; 22, head; 23, accommodating cavity; 24, side of the accommodating cavity. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Please refer to Figure 1 The composite electrode column of the first embodiment includes a pole body 2 and a sheet body 1 . The pole body 2 has a rod portion 21 and a head portion 22 . The head portion 22 is in a flat plate shape and is located at one end of the rod portion 21 .

[0031] The pole body 2 is made of aluminum, and the sheet 1 is made of copper. The sheet 1 has a thickness of 1 mm and a diameter of 13.9 mm, the pole body has a height of 10 mm, and the head 22 has a diameter of 16 mm and a thickness of 2 mm.

[0032] Please refer to Figure 2 The preparation process of the composite electrode column of the first embodiment includes the following steps:

[0033] A pole body 2 made of a first material and a sheet body 1 made of a second material are respectively processed by a cold forging process;

[0034] The sheet body 1 is embedded in the accommodation cavity 23 at the end of the pole body 2; and

[0035] The side portion 24 of the accommodating cavity 23 is plastically deformed by stamping to rivet the sheet 1 and the pole body 2 together, and the bottom, side, and top edges of the sheet 1 are tightly fitted with the pole body 2. Figure 2 , Figure 3 , thereby obtaining the composite electrode column.

[0036] Furthermore, the circumference of the top of the sheet body 1 is sunken to form a lip portion 11 , and the side portion 24 of the accommodating cavity 23 extends inwardly to cover the lip portion 11 .

[0037] Please refer to Figure 4 The composite electrode column of the second embodiment includes a pole body 2 and a sheet body 1. The pole body 2 has a rod 21 and a head 22. The head 22 is in a flat plate shape and is located at one end of the rod 21. The head 22 and the sheet body 1 are circular structures.

[0038] The pole body 2 is made of aluminum, and the sheet 1 is made of copper. The sheet 1 has a thickness of 1 mm and a diameter of 13.9 mm, the pole body has a height of 10 mm, and the head 22 has a diameter of 16 mm and a thickness of 2 mm.

[0039] Please refer to Figure 5 The preparation process of the composite electrode column of the second embodiment includes the following steps:

[0040] A pole body 2 made of a first material and a sheet body 1 made of a second material are respectively processed by a cold forging process;

[0041] The sheet body 1 is embedded in the accommodation cavity 23 at the end of the pole body 2; and

[0042] Rolling (i.e., rotary riveting) causes the side portion 24 of the accommodating cavity 23 to be plastically deformed so that the sheet 1 and the pole body 2 are riveted together, and the bottom, side, and top edges of the sheet 1 are tightly fitted with the pole body 2. Figure 5 , Figure 6 , thereby obtaining the composite electrode column.

[0043] Furthermore, the circumference of the top of the sheet body 1 is sunken to form a lip portion 11 , and the side portion 24 of the accommodating cavity 23 extends inwardly to cover the lip portion 11 .

[0044] The present invention uses a riveting process to composite the sheet body 1 and the pole body 2. Multiple surfaces (edges of the bottom, side and top) of the sheet body 1 are tightly fitted with the pole body 2, which effectively solves the technical defects of the composite electrode column being easy to break and having poor safety when the sheet body and the pole body are composited by the friction welding process. At the same time, compared with the friction welding composite method commonly used at present, the time spent on the riveting composite method of the present invention is greatly reduced. In addition, since the pole body will not produce thermal deformation during the riveting composite process, it does not need to be reshaped after the composite, which can effectively reduce the post-processing process and reduce costs.

[0045] The present invention is described in detail above through specific embodiments, and these detailed descriptions are only limited to helping those skilled in the art understand the content of the present invention, and cannot be understood as limiting the scope of protection of the present invention. Various modifications, equivalent transformations, etc. made by those skilled in the art to the above scheme under the conception of the present invention should be included in the scope of protection of the present invention.

Claims

1. A process for preparing a composite electrode column, characterized in that: The following steps are involved: A pole body (2) made of a first material and a sheet body (1) made of a second material are respectively produced by cold forging process; The sheet body (1) is embedded in the accommodation cavity (23) at the end of the pole body (2); as well as By stamping or rolling, the side of the accommodating cavity (23) is plastically deformed so that the sheet body (1) and the pole body (2) are riveted together, and the bottom, side, and top periphery of the sheet body (1) are tightly fitted with the pole body (2), thereby obtaining the composite electrode column.

2. The process for preparing the composite electrode column according to claim 1, characterized in that: The first material is aluminum, and the second material is copper.

3. The preparation process of the composite electrode column according to claim 1, characterized in that: The sheet body (1) has a thickness of 0.8-1.2 mm and a diameter of 13-18 mm, and the pole body (2) has a height of 8-12 mm.

4. The process for preparing the composite electrode column according to claim 1, characterized in that: The circumference of the top of the sheet body (1) is sunken to form a lip (11), and the side of the accommodating cavity (23) extends inwardly to cover the lip (11).

5. A composite electrode column, characterized in that: The composite electrode column comprises: A pole body (2) made of a first material, wherein an accommodating cavity (23) is formed at an end of the pole body (2); and A sheet (1) made of a second material, the sheet (1) being embedded in the accommodating cavity (23), and the bottom, side, and top edges of the sheet (1) being tightly fitted to the pole body (2); The circumference of the top of the sheet body (1) is sunken to form a lip (11), and the side of the accommodating cavity (23) extends inwardly to cover the lip (11).

6. The composite electrode column according to claim 5, characterized in that: The pole body (2) comprises a rod portion (21) and a head portion (22); the head portion (22) is in the shape of a flat plate and is located at one end of the rod portion (21); and the accommodating cavity (23) is formed at the upper end of the head portion (22).

7. The composite electrode column according to claim 6, characterized in that: The sheet body (1) has a thickness of 0.8-1.2 mm and a diameter of 13-18 mm, the pole body (2) has a height of 8-12 mm, and the head (22) has a diameter of 16-22 mm and a thickness of 1.5-2.5 mm.

8. The composite electrode column according to any one of claims 5 to 7, characterized in that: The first material is aluminum, and the second material is copper.

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