Battery top cover structure and battery pack

Abstract

The utility model provides a battery top cover structure and battery pack, including pole and battery cover plate, the pole includes upper pole body and lower pole body that connect up and down, the pole is riveted on the battery cover plate through lower pole body, the riveting position of lower pole body and battery cover plate is located below the battery cover plate, and the battery cover plate is connected with the battery cover plate through the upper pole body and the lower pole body. The top face of the upper column body is located above the battery cover plate, and the cross section of the upper column body is larger than the cross section of the lower column body. According to the utility model, the connection mode between the pole and the battery cover plate is changed, the weldable area of the pole is increased, and the over-current capability of the pole is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery top cover structure and a battery pack. Background Art

[0002] With the development of power batteries, the market requirements for battery energy density and charging speed are gradually increasing. Faster charging rates require a larger welding area for the battery poles. Conventional power battery poles are installed from the outside of the top cover, and the poles and the top cover are riveted together. The winding core is connected to the inner pole through an adapter. When the pole is riveted from the outside of the top cover, rivet marks will be left on the pole located outside the top cover, and the riveted area of ​​the pole (that is, the area where the rivet marks exist) cannot be welded, resulting in a reduction in the weldable area on the pole. In turn, it is impossible to ensure that the tabs are welded and fixed to the battery, which cannot meet the connection between batteries and the overcurrent requirements during fast charging of the battery. Utility Model Content

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and propose a battery top cover structure and a battery pack, which changes the connection method between the pole and the battery cover, increases the area of ​​the pole weldable area, and improves the pole's current carrying capacity.

[0004] The utility model proposes a battery top cover structure, including a pole and a battery cover plate, wherein the pole includes an upper column and a lower column connected up and down, the pole is riveted to the battery cover plate through the lower column, the riveted part between the lower column and the battery cover plate is located below the battery cover plate, the top surface of the upper column is located above the battery cover plate, and the cross-section of the upper column is much larger than the cross-section of the lower column.

[0005] A better technical solution of the utility model is as follows: an upper plastic part is provided on the battery cover, a receiving groove for accommodating the upper column is provided through the upper plastic part, a platform edge is provided at the bottom of the upper plastic part, the platform edge is arranged around the lower column, a connecting hole is provided on the battery cover, and the lower column is arranged in the connecting hole.

[0006] A better technical solution of the present invention is that a sealing member is provided in the connecting hole, and the sealing member is clamped between the lower column and the inner wall of the connecting hole.

[0007] A better technical solution of the present invention is that a stopper is provided at the bottom of the sealing member, the radial dimension of the stopper is larger than the radial diameter of the connecting hole, and the stopper abuts against the bottom of the battery cover.

[0008] A better technical solution of the present invention is as follows: a connecting portion is provided above the stop portion, and the platform edge is clamped between the connecting portion and the inner wall of the connecting hole.

[0009] A better technical solution of the present invention is that the top surface of the upper cylinder is a flat surface.

[0010] A better technical solution of the utility model is that a transfer piece is riveted on the bottom of the pole.

[0011] A better technical solution of the present utility model is as follows: a lower plastic part is provided below the battery cover, and the lower column is provided in the lower plastic part.

[0012] The utility model provides a battery pack, which includes a battery shell, a battery cell and a battery top cover structure. The battery cell is arranged in the battery shell, the battery top cover structure is covered on the battery shell, and the lower column is connected to the battery cell.

[0013] A battery top cover structure of the present invention has the following beneficial effects: the present application changes the connection method between the pole and the battery cover, and the pole is riveted and fixed to the battery cover from the inside of the battery cover, so that the riveted part between the pole and the battery cover is located below the battery cover and inside the battery pack, and there is no riveted area on the outside of the battery cover. The non-riveted end of the pole is located on the outside of the battery cover, which increases the weldable area of ​​the pole end face. All areas of the pole end face can be used for bar welding, thereby improving the pole's current carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0015] Figure 1 It is a cross-sectional view of an embodiment of the present invention.

[0016] Figure 2 It is a top view of an embodiment of the present utility model.

[0017] Figure 3 It is a bottom view of an embodiment of the present utility model.

[0018] Figure 4 This is a bottom view of the connected battery cells according to an embodiment of the present invention.

[0019] In the figure: 10, pole; 11, upper column; 12, lower column; 20, battery cover; 30, upper plastic part; 301, accommodating groove; 31, platform edge; 40, sealing part; 41, connecting part; 42, stopper; 50, adapter; 60, lower plastic part; 70, battery cell. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other.

[0021] See also Figures 1 to 4 A battery top cover structure includes a battery cover plate 20 and a pole 10. The pole 10 is riveted and fixed to the battery cover plate 20. The riveted portion between the pole 10 and the battery cover plate 20 is located on the inner side of the battery cover plate 20, and the non-riveted end is located on the outer side of the battery cover plate 20. Since the non-riveted end of the pole 10 is not roughened, its end surface can be used for welding the tabs, thereby increasing the weldable area on the surface of the pole 10 and meeting the fast charging overcurrent requirements.

[0022] Specifically, the pole 10 includes an upper column 11 and a lower column 12 connected to each other. The lower column 12 is cylindrical, and the upper column 11 is located above the lower column 12. The pole 10 is riveted to the battery cover 20 through the lower column 12. The riveted joint between the lower column 12 and the battery cover 20 is located below the battery cover 20. The top surface of the upper column 11 is located above the battery cover 20. The bar is welded and fixed to the top surface of the upper column 11 to connect the pole 10 and transmit electricity. The cross-sectional area of ​​the upper column 11 is larger than that of the lower column 12. The outer contour of the pole 10 is T-shaped to increase the current capacity of the pole 10 and meet the fast charging current requirements. Preferably, the top surface of the upper column 11 is a flat surface to provide a good welding environment for connecting the bar.

[0023] The battery cover 20 is provided with a connection hole, into which the terminal 10 is disposed. An upper plastic member 30 is provided on the battery cover 20, and a T-shaped receiving groove 301 is provided through the upper plastic member 30. The terminal 10 is inserted into the receiving groove 301. The bottom surface of the receiving groove 301 contacts the bottom surface of the upper column 11 to support and support the terminal 10. The lower column 12 extends through the receiving groove 301 and is located below the upper plastic member 30. Furthermore, a flange 31 is provided at the bottom of the upper plastic member 30. The flange 31 is arranged around the hole formed by the receiving groove 301 at the bottom of the lower plastic member 60. When the terminal 10 is inserted into the receiving groove 301, the flange 31 surrounds the outer circumference of the lower column 12. When the terminal 10 is placed in the connection hole, the flange 31 is sandwiched between the outer wall of the lower column 12 and the inner wall of the connection hole, isolating the battery cover 20 from the terminal 10 and preventing short circuits.

[0024] The battery cover 20 is also provided with a seal 40 to seal the battery pack and prevent external dust from entering the battery pack. The seal 40 is annular and includes a connecting portion 41 and a stop portion 42. The stop portion 42 is provided below the connecting portion 41. The outer diameter of the stop portion 42 is larger than that of the connecting portion 41. The seal 40 has an L-shaped cross-section and is provided in the connecting hole. The stop portion 42 is located below the battery cover 20 to limit the longitudinal displacement of the seal 40. The connecting portion 41 is located in the connecting hole and is sandwiched between the outer wall of the lower column 12 and the inner wall of the connecting hole to isolate the terminal 10 from the battery cover 20.

[0025] Preferably, when the sealing member 40 is arranged in the connecting hole, the top of the connecting portion 41 is located on the inner side of the platform edge 31, that is, the platform edge 31 is clamped between the connecting portion 41 and the inner wall of the connecting hole. When the pole 10 is installed on the battery cover 20, the platform edge 31 and the connecting portion 41 are both clamped between the outer wall of the lower column 12 and the inner wall of the connecting hole. The upper plastic part 30 and the sealing member 40 jointly play a sealing role to improve the sealing of the connection between the pole 10 and the battery cover 20 and isolate external dust.

[0026] A lower plastic part 60 is further provided below the battery cover 20, and the lower column 12 is provided inside the lower plastic part 60. An adapter plate 50 is fixedly provided at the bottom of the pole 10, and the adapter plate 50 is riveted to the lower column 12 to connect the battery cell 70 to the external circuit.

[0027] A battery pack includes a battery housing, a battery cell 70, and a battery cover structure. The battery cell 70 is disposed within the battery housing. The battery cover structure is mounted on the battery housing, sealing the battery cell 70 within the battery housing. An adapter plate 50 is used to connect the battery cell 70 to an external circuit. When the battery cover structure is connected to the battery housing, the lower plastic component 60 is sandwiched between the battery cell 70 and the battery cover plate 20 to separate the positive and negative electrodes of the battery cell 70 and prevent short circuits in the battery pack.

[0028] Although not further described in the present application, those skilled in the art can imagine that two poles 10 are provided on the battery cover 20 , which are used to connect the positive and negative poles of the battery cell 70 respectively.

[0029] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery top cover structure, characterized in that: The invention comprises a pole (10) and a battery cover (20), wherein the pole (10) comprises an upper column (11) and a lower column (12) connected to each other, the pole (10) is riveted to the battery cover (20) through the lower column (12), the riveted portion between the lower column (12) and the battery cover (20) is located below the battery cover (20), the top surface of the upper column (11) is located above the battery cover (20), and the cross section of the upper column (11) is greater than the cross section of the lower column (12); The battery cover (20) is provided with an upper plastic part (30), and a receiving groove (301) for receiving the upper column (11) is provided through the upper plastic part (30), and a platform edge (31) is provided at the bottom of the upper plastic part (30), and the platform edge (31) is provided around the lower column (12), and a connecting hole is provided on the battery cover (20), and the lower column (12) is provided in the connecting hole; A sealing member (40) is provided in the connection hole, and the sealing member (40) is sandwiched between the lower column (12) and the inner wall of the connection hole; A stopper (42) is provided at the bottom of the sealing member (40), the radial dimension of the stopper (42) being larger than the radial diameter of the connecting hole, and the stopper (42) abuts against the bottom of the battery cover (20); A connecting portion (41) is provided above the stop portion (42), and the platform edge (31) is sandwiched between the connecting portion (41) and the inner wall of the connecting hole.

2. A battery top cover structure according to claim 1, characterized in that: The top surface of the upper cylinder (11) is a flat surface.

3. A battery top cover structure according to claim 1, characterized in that: A transfer plate (50) is riveted on the bottom of the pole (10).

4. A battery top cover structure according to claim 3, characterized in that: A lower plastic part (60) is provided below the battery cover (20), and the lower column (12) is provided inside the lower plastic part (60).

5. A battery pack, characterized in that: The invention comprises a battery casing, a battery cell (70) and a battery top cover structure according to any one of claims 1 to 4, wherein the battery cell (70) is arranged in the battery casing, the battery top cover structure is covered on the battery casing, and the lower column (12) is connected to the battery cell (70).

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