A cylindrical battery cover plate assembly

Abstract

The utility model relates to lithium battery cover plate technical field discloses a cylindrical battery cover plate assembly, including circular cover plate, be equipped with pole on the circular cover plate, be equipped with connecting piece on the pole, the connecting piece has the welding portion, the welding portion is connected with the pole through the welding mode, its characterized in that, the welding portion includes first line segment department and second line segment department, and the first end of first line segment department and the second end of second line segment department are connected through the connecting portion, and the second end of first line segment department and the first end of second line segment department form interval. In the utility model, the cylindrical battery cover plate assembly is avoided the low intensity, high oxidation problem of the connecting piece welding of existing circular cover plate, and the structure heat influence is significantly reduced, thereby reducing the serious problem of connecting piece oxidation after welding, and the welding time of single top cover welding using the structure is shorter than traditional structure, and the overall production efficiency is improved, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of connecting technology for connecting pieces in lithium battery cover plates, and particularly to a cylindrical battery cover plate assembly. Background Technology

[0002] The battery cover has terminals that are connected to connecting pieces by welding. For square battery covers, the size is relatively large, and welding the connecting pieces is relatively simple. However, for cylindrical battery covers, due to their smaller size, especially for the laser welding process of aluminum alloy / copper-nickel composite dissimilar metal connecting pieces in new energy vehicle power batteries, the following problems often exist: 1. Insufficient weld strength after welding, typically maintaining a weld strength of 80-90N, unable to meet the welding requirement of >100N; 2. Significant heat-affected zone during welding. When using traditional circular welding structures, due to the large welding area and long welding time, oxidation is prone to occur. The oxide layer can affect battery overcurrent, impacting product performance. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model proposes a cylindrical battery cover assembly.

[0004] This utility model discloses a cylindrical battery cover assembly, including a circular cover plate with an electrode post on it. The electrode post has a connecting piece with a welding portion. The welding portion is connected to the electrode post by welding. Unlike existing technologies, the welding portion includes a first line segment and a second line segment. A first end of the first line segment and a second end of the second line segment are connected by a connecting portion, and a gap is formed between the second end of the first line segment and the first end of the second line segment. It should be noted that the first and second line segments are not theoretically straight segments; in the welding process, they may have a certain degree of bending or deflection.

[0005] Preferably, the first line segment and the second line segment are parallel.

[0006] Preferably, the welded part is Z-shaped, that is, the connecting part is straight. Preferably, the connecting part has a portion that intersects with the extension line of the pole axis.

[0007] Optionally, the welded portion is opposite to the end face of the pole post.

[0008] As a further optimization of this utility model, the circular cover plate has a receiving groove, the pole has a portion located in the receiving groove, the connecting piece is located in the receiving groove, and the side of the connecting piece contacts the side of the receiving groove.

[0009] As a further optimization of this utility model, a positioning post is provided in the receiving groove, and a positioning groove is opened on the connecting piece, the positioning groove matching the positioning post.

[0010] Specifically, there are at least two positioning grooves and at least one positioning post, with one positioning groove corresponding to one positioning post. At least one positioning groove is formed on the first side of the connecting piece, and at least one positioning groove is formed on the second side of the connecting piece. The first side and the second side are opposite to each other and are in contact with the side of the positioning groove.

[0011] Preferably, at least one of the positioning grooves is opposite to the welded portion.

[0012] Preferably, the distances from any two of the positioning grooves to the welded part are not equal.

[0013] As a further optimization of this utility model, the receiving groove is provided with a limiting strip, and a heat dissipation space is formed between any two adjacent sets of the limiting strips. The upper surface of the limiting strip is not higher than the upper end surface of the pole post. Thus, during the welding of the connecting piece, the limiting strip can assist in limiting the connecting piece that is not in contact with the pole post and ensure its heat dissipation effect.

[0014] Preferably, the upper surface of the connecting piece is located below the upper surface of the circular cover plate.

[0015] The proposed cylindrical battery cover assembly avoids the problems of low strength and high oxidation in the welding of existing circular cover connecting pieces; the heat-affected zone of this structure is significantly reduced, thereby reducing the problem of severe oxidation of the connecting pieces after welding; the welding time of a single top cover is shorter than that of the traditional structure, and the overall production efficiency is improved.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is the front view of the present utility model;

[0019] Figure 3 This is a schematic diagram of the connecting circular cover plate structure of this utility model;

[0020] In the diagram: 1. Circular cover plate; 10. Receiving groove; 2. Pole post; 3. Connecting piece; 30. Positioning groove; 4. Welding part; 40. First line segment part; 41. Second line segment part; 42. Connecting part; 5. Positioning post; 6. Limiting strip. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] like Figure 1-3 The cylindrical battery cover assembly shown includes a circular cover plate 1, a terminal post 2 on the circular cover plate 1, and a connecting piece 3 on the terminal post 2. The connecting piece 3 has a welding portion 4, which is connected to the terminal post 2 by welding. The welding portion 4 includes a first segment 40 and a second segment 41, which are the welding connection points of the terminal post 2 and the connecting piece 3. The first end of the first segment 40 and the second end of the second segment 41 are connected by a connecting portion 42, and a gap is formed between the second end of the first segment 40 and the first end of the second segment 41. This welding structure increases the welding strength between the circular cover plate 1 and the connecting piece 3; it also reduces the heat-affected zone, minimizing the problem of severe oxidation of the connecting piece 3 after welding; and it shortens the welding cycle, improving production efficiency.

[0023] Preferably, the first segment 40 and the second segment 41 are parallel to ensure welding strength. Specifically, the first segment 40 and the second segment 41 are of equal length and symmetrical about a straight line relative to the pole post 2.

[0024] Preferably, the welding part 4 is Z-shaped, that is, the connecting part 42 is linear, which facilitates the welding operation. Preferably, the connecting part 42 has a part that intersects with the extension line of the pole post 2 axis to ensure welding strength and reduce heat impact.

[0025] Preferably, the welding part 4 is opposite to the end face of the pole post 2, and the welding part 4 does not extend beyond the pole post 2 to ensure the welding effect.

[0026] like Figure 3 As shown, in some embodiments, preferably, the circular cover plate 1 has a receiving groove 10, the pole post 2 has a portion located in the receiving groove 10, the connecting piece 3 is located in the receiving groove 10, and the side of the connecting piece 3 contacts the side of the receiving groove 10, thereby facilitating the positioning and limiting of the connecting piece 3.

[0027] In some preferred embodiments, the receiving groove 10 is provided with a positioning post 5, and the connecting piece 3 is provided with a positioning groove 30. The positioning groove 30 matches the positioning post 5 to further realize the positioning of the connecting piece 3.

[0028] Specifically, there are at least two positioning grooves 30 and positioning posts 5, with one positioning groove 30 corresponding to one positioning post 5. At least one positioning groove 30 is opened on the first side of the connecting piece 3, and at least one positioning groove 30 is opened on the second side of the connecting piece 3. The first side and the second side are opposite to each other, and the first side and the second side are in contact with the side of the positioning groove 30 to prevent the connecting piece 3 from moving relative to the pole post 2 during the welding process and to ensure welding accuracy.

[0029] Preferably, at least one positioning groove 30 is opposite to the welding part 4, thereby ensuring welding accuracy.

[0030] Preferably, the distances from any two positioning grooves 30 to the welding part 4 are not equal. Under the premise of ensuring positioning accuracy, the number of positioning grooves 30 can be reduced. In this embodiment, there are two sets of positioning grooves 30: one positioning groove 30 is opened on the first side and one positioning groove 30 is opened on the second side. The distances from the two positioning grooves 30 to the welding part 4 are not equal, so that the positioning of the connecting piece 3 can be achieved.

[0031] Preferably, the receiving groove 10 is provided with limiting strips 6, and a heat dissipation space is formed between any two adjacent sets of limiting strips 6. The upper surface of the limiting strip 6 is not higher than the upper end surface of the pole post 2. Preferably, the upper surface of the limiting strip 6 is slightly lower than the upper end surface of the pole post 2. Thus, during the welding of the connecting piece 3, the limiting strip 6 can provide auxiliary limiting for the connecting piece 3 that is not in contact with the pole post 2, and the heat dissipation effect can be guaranteed by the structure of the heat dissipation space. At the same time, at least two sets of limiting strips 6 contact the outer surface of the pole post 2 to achieve the positioning of the pole post 2.

[0032] Preferably, the upper surface of the connecting piece 3 is located below the upper end face of the circular cover plate 1, thereby protecting the welding between the connecting piece 3 and the pole post 2 and saving space.

[0033] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery cover assembly, comprising a circular cover (1), wherein an electrode post (2) is provided on the circular cover (1), a connecting piece (3) is provided on the electrode post (2), the connecting piece (3) having a welding portion (4), the welding portion (4) being connected to the electrode post (2) by welding, characterized in that, The welding part (4) includes a first line segment (40) and a second line segment (41). The first end of the first line segment (40) and the second end of the second line segment (41) are connected by a connecting part (42), and a gap is formed between the second end of the first line segment (40) and the first end of the second line segment (41).

2. The cylindrical battery cover assembly according to claim 1, characterized in that, The first line segment (40) and the second line segment (41) are parallel.

3. A cylindrical battery cover assembly according to claim 1, characterized in that, The welded part (4) is in the shape of a "Z".

4. A cylindrical battery cover assembly according to claim 1, characterized in that, The welded part (4) is opposite to the end face of the pole post (2).

5. A cylindrical battery cover assembly according to claim 1, characterized in that, The circular cover plate (1) has a receiving groove (10), the pole post (2) has a part located in the receiving groove (10), the connecting piece (3) is located in the receiving groove (10), and the side of the connecting piece (3) is in contact with the side of the receiving groove (10).

6. A cylindrical battery cover assembly according to claim 5, characterized in that, The receiving groove (10) is provided with a positioning post (5), and the connecting piece (3) has a positioning groove (30) that matches the positioning post (5).

7. A cylindrical battery cover assembly according to claim 6, characterized in that, At least two positioning grooves (30) and positioning posts (5) are provided, with one positioning groove (30) corresponding to one positioning post (5). At least one positioning groove (30) is opened on the first side of the connecting piece (3), and at least one positioning groove (30) is opened on the second side of the connecting piece (3). The first side and the second side are opposite to each other, and the first side and the second side are in contact with the side of the positioning groove (30).

8. A cylindrical battery cover assembly according to claim 7, characterized in that, At least one of the positioning grooves (30) is opposite to the welded part (4).

9. A cylindrical battery cover assembly according to claim 7, characterized in that, The distances from any two of the positioning grooves (30) to the welding part (4) are not equal.

10. A cylindrical battery cover assembly according to claim 5, characterized in that, The receiving groove (10) is provided with a limiting strip (6), and a heat dissipation space is formed between any two adjacent sets of the limiting strips (6). The upper surface of the limiting strip (6) is not higher than the upper end surface of the pole post (2).

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