Battery top cover structure and power battery

Abstract

The utility model provides a battery top cover structure and a power battery, and the battery top cover structure comprises two pole columns, namely a positive pole column and a negative pole column, the light aluminum sheet is provided with two mounting holes, and the anti-explosion valve is arranged on the light aluminum sheet; two fixing table bodies are arranged on the plastic plate, two fixing holes are formed in the plastic plate, the fixing holes penetrate through the fixing table bodies, the two pole columns are arranged in the two fixing holes respectively, and the plastic plate is integrally formed through injection molding; the fixing table body is arranged in the mounting hole, an annular groove is formed in the outer surface of the fixing table body, and the upper end face and the lower end face of the light aluminum sheet abut against the inner wall of the annular groove. The plastic plate is of an integrated structure, upper plastic and lower plastic in an original structure are integrated, separate injection molding is not needed, the top cover machining technology is simplified, and the production cost is reduced.

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 power battery. Background Art

[0002] The battery cover typically consists of a plain aluminum sheet, upper and lower plastics, a sealing ring, positive and negative electrodes, an explosion-proof valve, and a protective sheet. The seal between the electrodes and the plain aluminum sheet is achieved by compressing the sealing ring. The plain aluminum sheet has an injection hole. After the battery cell is injected, sealing rubber particles are injected through the injection hole and the sealing aluminum sheet is welded. The sealing effect achieved by compressing the sealing ring is unstable and there is a risk of leakage. Furthermore, the overall processing of the cover is complex, the assembly operation is tedious, and the cost is high. Utility Model Content

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a battery top cover structure and a power battery.

[0004] The utility model proposes a battery top cover structure, comprising two poles, namely a positive pole and a negative pole; a plain aluminum sheet, wherein two mounting holes are provided on the plain aluminum sheet, and an explosion-proof valve is arranged on the plain aluminum sheet; a plastic plate, wherein two fixing platforms are provided on the plastic plate, wherein two fixing holes are provided on the plastic plate, wherein the fixing holes penetrate the fixing platforms, and the two poles are respectively arranged in the two fixing holes, and the plastic plate is integrally injection-molded; the fixing platforms are arranged in the mounting holes, and an annular groove is provided on the outer surface of the fixing platforms, and the upper and lower end surfaces of the plain aluminum sheet are respectively in contact with the inner wall of the annular groove.

[0005] A better technical solution of the utility model is as follows: a limiting groove is provided on the outer surface of the pole, the limiting groove is an annular groove, the inner wall of the fixing hole is provided with an annular platform edge, the annular platform edge protrudes from the inner wall of the fixing hole, the annular platform edge is arranged in the limiting groove, and its upper and lower end faces respectively abut against the inner wall of the limiting groove.

[0006] A better technical solution of the present utility model is as follows: a limiting surface is provided at the bottom of the limiting groove, the limiting surface is a plane, a flat position is provided on the side of the annular platform edge facing the fixing hole, and the flat position abuts against the limiting surface.

[0007] A better technical solution of the present utility model is that a base is provided at the bottom of the pole, and the cross-sectional area of ​​the base is larger than the cross-sectional area of ​​the pole.

[0008] A better technical solution of the utility model is as follows: a countersunk hole is provided on the plastic plate, the countersunk hole extends from the lower end surface of the plastic plate to the upper end surface of the plastic plate, the countersunk hole is opposite to the fixed platform, the fixing hole is connected to the countersunk hole, and the base is provided in the countersunk hole.

[0009] A better technical solution of the present invention is as follows: a positioning platform is provided on the lower end surface of the plastic plate, the bottom surface of the positioning platform protrudes from the lower end surface of the plastic plate, and a groove is provided on the positioning platform, and the groove extends from the upper end surface of the plastic plate to the bottom surface of the positioning platform.

[0010] A better technical solution of the present invention is that a plurality of exhaust holes are provided at the bottom of the positioning platform, and the exhaust holes are connected to the groove.

[0011] A better technical solution of the present invention is as follows: a connecting hole is provided on the plain aluminum sheet, a sink is provided on the upper end surface of the plain aluminum sheet 10 around the connecting hole, the explosion-proof valve is provided in the sink, and the connecting hole is connected to the groove.

[0012] A better technical solution of the present invention is as follows: a protrusion is provided on the inner wall of the mounting hole, and a plurality of the protrusions are arranged at intervals in the circumferential direction around the mounting hole.

[0013] A power battery is assembled using the battery top cover structure.

[0014] The battery top cover structure and power battery of the utility model have the following beneficial effects:

[0015] 1. The plastic plate is injection molded into one piece, integrating the upper and lower plastics in the original structure into one, eliminating the need for separate injection molding, simplifying the top cover processing technology and reducing production costs;

[0016] 2. The sealing ring design in the original structure has been eliminated and the sealing ring is integrated into the plastic plate. Through injection molding, the plastic plate is used for sealing, which simplifies the top cover processing technology, reduces production costs, and improves the reliability of the pole sealing;

[0017] 3. The injection hole design on the polished aluminum sheet in the original structure has been cancelled, and the liquid can be injected directly through the connecting hole corresponding to the explosion-proof valve, which simplifies the molding process of the polished aluminum sheet; there is no need to add sealing particles during the battery cell process, which simplifies the battery cell processing process and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is an exploded view of an embodiment of the present invention.

[0020] Figure 2This is a structural view of the plastic plate in an embodiment of the present utility model.

[0021] Figure 3 It is a bottom view of the plastic plate in the embodiment of the present utility model.

[0022] Figure 4 This is a structural view of the light aluminum sheet in an embodiment of the present utility model.

[0023] Figure 5 This is a structural view of the pole in an embodiment of the present utility model.

[0024] Figure 6 It is a cross-sectional view of an embodiment of the present utility model.

[0025] Figure 7 For the embodiment of the utility model Figure 6 Enlarged view of point A in the middle.

[0026] In the figure: 10, plain aluminum sheet; 101, mounting hole; 102, protrusion; 103, connecting hole; 104, countersunk groove; 20, plastic plate; 201, fixing hole; 202, countersunk hole; 203, groove; 204, exhaust hole; 21, fixing platform; 211, annular platform edge; 212, flat position; 213, annular groove; 22, positioning platform; 30, pole; 301, limiting groove; 302, limiting surface; 31, base; 40, explosion-proof valve; 50, protective sheet. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figures 1 to 7. A secondary battery top cover structure and a power battery, including two poles 30, a plastic plate 20 and a bare aluminum sheet 10, the two poles 30 are respectively a positive pole 30 and a negative pole 30, the bare aluminum sheet 10 is provided with two mounting holes 101, the plastic plate 20 is provided with two fixing platforms 21, the fixing platforms 21 are provided with fixing holes 201, the fixing holes 201 pass through the fixing platforms 21, the two poles 30 are respectively inserted into the two fixing holes 201, the fixing platforms 21 are inserted into the mounting holes 101 to isolate the bare aluminum sheet 10, the outer surface of the fixing platforms 21 is provided with an annular groove 213, the bare aluminum sheet 10 is provided in the annular groove 213, and the upper and lower ends of the bare aluminum sheet 10 are respectively in contact with the inside of the annular groove 213. The present application fixes and seals the poles 30 through the integrated injection-molded plastic plate 20, simplifies the top cover processing technology, and reduces production costs.

[0029] The positive and negative poles 30 are common cylindrical shapes. The mounting hole 101 and the fixing hole 201 are both circular holes. The fixing platform 21 is a frustum. The central axis of the fixing hole 201 is collinear with the central axis of the fixing platform 21. The pole 30 is inserted into the fixing hole 201 from the bottom of the plastic plate 20. To secure the pole 30 relative to the plastic plate 20, a limiting groove 301 is provided on the pole 30. The limiting groove 301 is an annular groove and is arranged around the outer circumference of the pole 30. Correspondingly, an annular lip 211 is provided in the fixing hole 201. The annular lip 211 is arranged around the inner wall of the fixing hole 201 and protrudes from the inner wall of the fixing hole 201. The annular lip 211 is inserted into the limiting groove 301. The annular lip 211 surrounds the pole 30 circumferentially, and the upper and lower end surfaces of the annular lip 211 respectively abut against the side walls of the limiting groove 301 to secure the pole 30 and prevent the pole 30 from falling out of the fixing hole 201.

[0030] Furthermore, a limiting surface 302 is provided at the bottom of the limiting groove 301. The limiting surface 302 is a straight surface, and its length is less than the diameter of the pole 30 corresponding to the limiting groove 301. Correspondingly, a flat portion 212 is provided on the side of the annular platform 211 facing the middle of the fixing hole 201. The flat portion 212 is a planar structure, and its length is less than or equal to the length of the limiting surface 302. When the annular platform 211 is disposed in the limiting groove 301, the flat portion 212 abuts the limiting surface 302, thereby limiting the rotation of the pole 30 in the fixing hole 201. The cooperation between the annular platform 211 and the limiting groove 301 limits the movement of the pole 30 in the axial direction of the fixing hole 201, while the cooperation between the flat portion 212 and the limiting surface 302 limits the rotation of the pole 30, thereby fixing the pole 30 to the plastic plate 20.

[0031] A base 31 is provided at the bottom of the pole 30. The base 31 is a plate-shaped structure and can replace the connecting piece to provide a transmission channel for current. The base 31 and the pole 30 are integrally formed, eliminating the operation of welding the pole 30 and the connecting piece and simplifying the processing technology. The cross-sectional area of ​​the base 31 is larger than the cross-sectional area of ​​the pole 30 to increase the battery's current capacity.

[0032] The lower end surface of the plastic plate 20 is provided with a countersunk hole 202, which is opposite the fixing platform 21. The countersunk hole 202 extends from the lower end surface of the plastic plate 20 to the upper end surface of the plastic plate 20, and the fixing hole 201 is connected to the countersunk hole 202. When the terminal 30 is inserted into the fixing hole 201, the base 31 is located in the countersunk hole 202, thereby reducing the space occupied by the terminal 30 below the plastic plate 20.

[0033] The lower surface of the plastic plate 20 is provided with a positioning platform 22, which protrudes from the lower surface. During cell assembly, the bottom of the positioning platform 22 abuts against the upper surface of the cell, limiting displacement and preventing movement within the power battery. The plastic plate 20 is provided with a groove 203, corresponding to the positioning platform 22. The groove 203 extends from the upper surface of the plastic plate 20 to the bottom of the positioning platform 22. Several vent holes 204 are provided at the bottom of the groove 203 to assist in exhaust during the cell filling process.

[0034] The fixed platform 21 is disposed within the mounting hole 101. An annular groove 213 is provided on the outer circumference of the fixed platform 21, extending around the fixed platform 21. When the fixed platform 21 is positioned within the mounting hole 101, the bare aluminum sheet 10 is inserted into the annular groove 213, with the upper and lower end surfaces of the bare aluminum sheet 10 abutting against the sidewalls of the annular groove 213. The annular groove 213 forms upper and lower limit stops for the bare aluminum sheet 10, preventing axial displacement of the bare aluminum sheet 10 relative to the solid platform.

[0035] Furthermore, a plurality of protrusions 102 are arranged at circumferential intervals around the inner wall of the mounting hole 101, and the protrusions 102 abut against the bottom surface of the annular groove 213. The plurality of protrusions 102 form a limit in the axial direction of the fixed platform 21, which can improve the stability of the pole 30 in the fixed platform 21 and increase the torsional resistance of the pole 30.

[0036] The bare aluminum sheet 10 is provided with a through-hole 103. A recess 104 is formed on the upper surface of the bare aluminum sheet 10, surrounding the through-hole 103. The explosion-proof valve 40 is housed within the recess 104. When the bare aluminum sheet 10 is connected to the plastic sheet 20, the through-hole 103 aligns with the recess 203, allowing liquid to be directly injected into the power battery through the through-hole 103. After injection, the explosion-proof valve 40 is welded to the bare aluminum sheet 10, and a protective sheet 50 is attached. Compared to existing technologies, this eliminates the need for a liquid injection hole in the bare aluminum sheet 10, simplifying the processing of the bare aluminum sheet 10 and reducing costs.

[0037] In this application, the plastic plate 20 is integrally injection molded. Specifically, the bare aluminum sheet 10 and the pole 30 are positioned in a mold, and then injection molded into the mold to form the plastic plate 20. This integrated molding simplifies the processing of the plastic plate 20. At the same time, the gap between the poles 30 is filled with plastic to achieve a sealing effect, eliminating the sealing operation and simplifying the battery processing process.

[0038] It also includes a power battery, which is assembled using the above-mentioned battery top cover structure.

[0039] 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: include Two poles (30), a positive pole and a negative pole; A plain aluminum sheet (10), wherein two mounting holes (101) are provided on the plain aluminum sheet (10), and an explosion-proof valve (40) is provided on the plain aluminum sheet (10); A plastic plate (20) is provided with two fixing platforms (21) thereon, the plastic plate (20) is provided with two fixing holes (201), the fixing holes (201) pass through the fixing platform (21), the two poles (30) are respectively provided in the two fixing holes (201), and the plastic plate (20) is integrally injection molded; The fixing platform (21) is arranged in the mounting hole (101), and an annular groove (213) is provided on the outer surface of the fixing platform (21), and the upper and lower end surfaces of the smooth aluminum sheet (10) respectively abut against the inner wall of the annular groove (213).

2. A battery top cover structure according to claim 1, characterized in that: A limiting groove (301) is provided on the outer surface of the pole (30), and the limiting groove (301) is an annular groove. An annular platform edge (211) is provided on the inner wall of the fixing hole (201), and the annular platform edge (211) protrudes from the inner wall of the fixing hole (201). The annular platform edge (211) is arranged in the limiting groove (301), and its upper and lower end surfaces respectively abut against the inner wall of the limiting groove (301).

3. A battery top cover structure according to claim 2, characterized in that: A limiting surface (302) is provided at the bottom of the limiting groove (301), and the limiting surface (302) is a plane. A flat portion (212) is provided on the side of the annular platform edge (211) facing the fixing hole (201), and the flat portion (212) abuts against the limiting surface (302).

4. A battery top cover structure according to claim 1, characterized in that: A base (31) is provided at the bottom of the pole (30), and the cross-sectional area of ​​the base (31) is larger than the cross-sectional area of ​​the pole (30).

5. A battery top cover structure according to claim 4, characterized in that: The plastic plate (20) is provided with a countersunk hole (202), the countersunk hole (202) extending from the lower end surface of the plastic plate (20) to the upper end surface of the plastic plate (20), the countersunk hole (202) being opposite to the fixing platform (21), the fixing hole (201) being connected to the countersunk hole (202), and the base (31) being provided in the countersunk hole (202).

6. The battery top cover structure according to claim 1, characterized in that: A positioning platform (22) is provided on the lower end surface of the plastic plate (20), the bottom surface of the positioning platform (22) protrudes from the lower end surface of the plastic plate (20), and a groove (203) is provided on the positioning platform (22), and the groove (203) extends from the upper end surface of the plastic plate (20) to the bottom surface of the positioning platform (22).

7. A battery top cover structure according to claim 6, characterized in that: A plurality of exhaust holes (204) are provided at the bottom of the positioning platform (22), and the exhaust holes (204) are connected to the groove (203).

8. A battery top cover structure according to claim 7, characterized in that: A communication hole (103) is provided on the bare aluminum sheet (10), a sink (104) is provided on the upper end surface of the bare aluminum sheet (10) around the communication hole (103), the explosion-proof valve (40) is arranged in the sink (104), and the communication hole (103) is connected to the groove (203).

9. The battery top cover structure according to claim 1, characterized in that: A protrusion (102) is provided on the inner wall of the mounting hole (101), and a plurality of the protrusions (102) are arranged at intervals in the circumferential direction around the mounting hole (101).

10. A power battery, characterized in that: The battery top cover structure according to any one of claims 1 to 9 is used for assembly.

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