Lithium battery cover plate

Abstract

The utility model provides a lithium battery cover plate which comprises a cover plate body, lug holes are formed in the two sides of the cover plate body, negative rivets and positive rivets are distributed in the lug holes in the two sides of the cover plate body in a penetrating mode, and the positive rivets are used for fixedly riveting positive and negative pressing blocks, a positive conducting strip, the cover plate body, a lower plastic piece and a positive lug connecting piece together. The cathode rivet is used for fixedly riveting the anode and cathode pressing block, the cathode upper plastic piece, the cover plate, the lower plastic piece and the cathode tab connecting piece together; a sealing piece is arranged in the tab hole, the lower surface of the sealing piece is tightly attached to the positive pole tab connecting piece or the negative pole tab connecting piece, and the upper surface of the sealing piece is tightly attached to the lower surface of the positive and negative pole pressing block. According to the utility model, the selected conducting strip can conduct the aluminum shell and the positive pole lug connecting piece, so that the potential difference between the aluminum shell and the positive pole of the battery is eliminated, the aluminum shell is prevented from being corroded due to the potential difference, and a two-dimensional code is engraved on the cover plate through laser, so that a worker can conveniently and directly scan the code to obtain parameter information of the lithium battery.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries or technology, in particular to a lithium battery cover. Background Art

[0002] A battery cover is a cover that covers the top of a battery and is often connected to the battery in various ways. Common materials for battery covers include plastic and metal. Plastics typically include polypropylene (PP), polycarbonate (PC), and polyethylene (PE); metals typically include iron, nickel, cobalt, and copper. The battery cover plays a crucial role in the battery. First, it protects the battery's internal cell circuitry and electrolyte from damage. Second, it prevents electrolyte leakage, ensuring proper battery operation.

[0003] Currently, there are many problems in the production and storage of lithium-ion batteries: during long-term storage, the aluminum shell will corrode due to the potential difference between the aluminum shell and the positive electrode of the battery. In addition, the QR code recording the battery information is often engraved on the outer wall of the aluminum shell, which is inconvenient for staff to scan the code; during the folding process of the pole ear, the position of the folding ear is not convenient to control accurately, the folding effect is poor, and the entire pole ear is prone to folding off. Utility Model Content

[0004] The purpose of the present invention is to improve and innovate the shortcomings and problems existing in the background technology and provide a lithium battery cover.

[0005] A lithium battery cover plate, comprising a cover plate, wherein both sides of the cover plate are provided with tab holes, and negative electrode rivets and positive electrode rivets are distributed and penetrated in the tab holes on both sides of the cover plate, the positive electrode rivets are used to rivet the positive and negative electrode blocks, the positive electrode conductive sheet, the cover plate, the lower plastic part and the positive electrode tab connecting piece together, and the negative electrode rivets are used to rivet the positive and negative electrode blocks, the negative electrode upper plastic part, the cover plate, the lower plastic part and the negative electrode tab connecting piece together; a sealing member is provided in the tab hole, under the action of the positive electrode rivet, the lower surface of the sealing member in one tab hole is tightly fitted with the positive electrode tab connecting piece, and the upper surface of the sealing member is tightly fitted with the lower surface of the positive and negative electrode blocks corresponding to the positive electrode tab connecting piece; under the action of the negative electrode rivet, the lower surface of the sealing member in the other tab hole is tightly fitted with the negative electrode tab connecting piece, and the upper surface of the sealing member is tightly fitted with the lower surface of the positive and negative electrode blocks corresponding to the negative electrode tab connecting piece.

[0006] A further solution is that protrusions are provided on the edge and middle of the lower surface of the lower plastic part, so that a recessed portion for accommodating the positive electrode tab connecting piece and the negative electrode tab connecting piece is formed on the lower surface of the lower plastic part.

[0007] A further solution is that a liquid injection hole is provided on the cover plate, and a crescent groove is provided on one end of the positive and negative electrode pressing blocks close to the liquid injection hole.

[0008] A further solution is that a QR code is engraved on the upper surface of the cover plate, and the QR code is used to record parameter information of the lithium battery.

[0009] A further solution is that an explosion-proof membrane is provided between the upper surface of the middle portion of the lower plastic part and the cover plate, a through hole corresponding to the middle portion of the explosion-proof membrane is provided in the middle portion of the cover plate, and an exhaust hole is provided on the lower plastic part.

[0010] A further solution is that both the positive electrode tab connecting piece and the negative electrode tab connecting piece are provided with folding tab grooves.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the present invention uses a positive electrode conductive sheet for the positive electrode tab connecting sheet and a negative electrode upper plastic part for the negative electrode tab connecting sheet. The negative electrode upper plastic part separates the positive and negative electrode pressing blocks corresponding to the negative electrode tab connecting sheet from the cover plate, thereby playing an insulating role. When the cover plate is welded to the aluminum shell, the conductive sheet used for the positive electrode tab connecting sheet can conduct the aluminum shell and the positive electrode tab connecting sheet, thereby eliminating the potential difference between the aluminum shell and the positive electrode of the battery, thereby avoiding corrosion of the aluminum shell due to the potential difference problem.

[0012] (2) The utility model uses laser to engrave the QR code on the cover plate instead of on the aluminum shell, so that during the transportation of lithium batteries, it is convenient for workers to scan the QR code to obtain information such as the production batch, production time, raw materials, capacity and voltage of the lithium batteries;

[0013] (3) The utility model provides an explosion-proof membrane between the upper surface of the middle portion of the lower plastic part and the cover plate. When the pressure inside the aluminum shell is too high, the explosion-proof membrane ruptures, thereby providing pressure relief protection.

[0014] (4) The present invention provides a crescent groove at one end of the positive and negative electrode pressing blocks near the injection hole, thereby reducing the impact of the positive and negative electrode pressing blocks on the injection hole and facilitating the injection of electrolyte into the aluminum shell through the injection hole;

[0015] (5) The present invention provides ear folding grooves on both the positive electrode tab connector and the negative electrode tab connector, thereby facilitating manual ear folding. The tabs will not fall off, the position of the folded tabs can be accurately controlled, and the ear folding effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic cross-sectional structure diagram of a lithium battery cover provided by the first embodiment of the present utility model;

[0018] Figure 2 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0019] Figure 3 A schematic diagram of a three-dimensional structure of a lithium battery cover provided by the first embodiment of the present utility model Figure 1 ;

[0020] Figure 4 A schematic diagram of a three-dimensional structure of a lithium battery cover provided by the first embodiment of the present utility model Figure 2 .

[0021] Figure markings: negative electrode rivet 1, negative electrode upper plastic part 2, positive and negative electrode pressing blocks 3, positive electrode rivet 4, cover plate 5, lower plastic part 6, positive electrode tab connecting piece 7, negative electrode tab connecting piece 8, sealing part 9, explosion-proof membrane 10, positive electrode conductive sheet 11, folding ear groove 12, liquid injection hole 13, QR code 14. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0023] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] See also Figures 1-4The present invention provides a lithium battery cover plate, comprising a cover plate 5 and a lower plastic part 6. The cover plate 5 is placed above the lower plastic part 6. The outer wall of the cover plate 5 is welded to the aluminum shell. The welding method can be fusion welding, pressure welding, and brazing. Both sides of the cover plate 5 are provided with tab holes. A positive electrode conductive sheet 11 and a positive and negative electrode pressing block 3 are sequentially arranged above the cover plate 5 at the tab hole on one side. A positive tab connecting piece 7 is arranged below the lower plastic part 6 at the tab hole. A negative electrode upper plastic part 2 and a positive and negative electrode pressing block 3 are sequentially arranged above the cover plate 5 at the tab hole on the other side. A negative tab connecting piece 8 is arranged below the lower plastic part 6 at the tab hole. Positive electrode rivets 4 and negative electrode rivets 1 are distributed and penetrated in the tab holes on both sides of the cover plate 5. The positive electrode rivets 4 are used to rivet the positive and negative electrode blocks 3, the positive electrode conductive sheet 11, the cover plate 5, the lower plastic part 6, and the positive electrode tab connecting piece 7 together. The negative electrode rivets 1 are used to rivet the positive and negative electrode blocks 3, the negative electrode upper plastic part 2, the cover plate 5, the lower plastic part 6, and the negative electrode tab connecting piece 8 together. The positive electrode conductive sheet 11 is used for the positive electrode tab connecting piece 7, and the negative electrode upper plastic part 2 is used for the negative electrode tab connecting piece 8. The negative electrode upper plastic part 2 separates the positive and negative electrode blocks 3 corresponding to the negative electrode tab connecting piece 8 from the cover plate 5, providing insulation. When the cover plate 5 is welded to the aluminum shell, the positive electrode conductive sheet 11 used for the positive electrode tab connecting piece 7 can conduct electricity between the aluminum shell and the positive electrode tab connecting piece 7, thereby eliminating the potential difference between the aluminum shell and the positive electrode of the battery cell, thereby preventing corrosion of the aluminum shell due to the potential difference problem.

[0026] A sealing member 9 is provided in the tab hole. Under the action of the positive rivet 4, the lower surface of the sealing member 9 in the tab hole corresponding to the positive tab connecting piece 7 is tightly fitted with the positive tab connecting piece 7, and the upper surface of the sealing member 9 is tightly fitted with the lower surface of the positive and negative electrode pressing blocks 3 corresponding to the positive tab connecting piece 7; under the action of the negative rivet 1, the lower surface of the sealing member 9 in the tab hole corresponding to the negative tab connecting piece 8 is tightly fitted with the negative tab connecting piece 8, and the upper surface of the sealing member 9 is tightly fitted with the lower surface of the positive and negative electrode pressing blocks 3 corresponding to the negative tab connecting piece 8; so that the sealing member 9 plays a good sealing role and the electrolyte in the aluminum shell will not leak.

[0027] The lower surface edge and middle of the lower plastic part 6 are provided with protrusions, so that the lower surface of the lower plastic part 6 is formed with recessed portions for accommodating the positive pole tab connector 7 and the negative pole tab connector 8 respectively. The positive pole tab connector 7 and the negative pole tab connector 8 are both provided with ear folding grooves. The ear folding grooves facilitate the manual folding of the tabs, and the tabs will not fall off. The position of the folded tabs can be accurately controlled, and the ear folding effect is good. After the positive pole tab connector 7 and the negative pole tab connector 8 are folded, the positive and negative poles of the battery cell are welded together with the positive pole tab connector 7 and the negative pole tab connector 8. At this time, an explosion-proof membrane can be installed on the outside of the battery cell; and the explosion-proof membrane is welded to the protrusion of the lower plastic part 6 by ultrasonic welding.

[0028] An explosion-proof membrane 10 is disposed between the upper surface of the middle portion of the lower plastic member 6 and the cover plate 5. A through hole is provided in the middle of the cover plate 5, corresponding to the middle portion of the explosion-proof membrane 10. A vent is provided in the lower plastic member 6. When the pressure within the aluminum shell is too high, the explosion-proof membrane 10 ruptures, thereby providing pressure relief.

[0029] The cover plate 5 is provided with an injection hole 13, and the positive and negative electrode pressing blocks 3 are provided with a crescent groove at one end close to the injection hole 13. The crescent groove can reduce the impact of the positive and negative electrode pressing blocks 3 on the injection hole 13, and helps to inject electrolyte into the aluminum shell through the injection hole 13.

[0030] A QR code 14 is engraved on the upper surface of the cover plate 5. The QR code 14 is used to record the parameter information of the lithium battery. In this application, the QR code 14 is engraved on the cover plate 5 by laser instead of on the side wall of the aluminum shell. During the transportation of the lithium battery, since the cover plate 5 is facing upward, it is convenient for the staff to scan the code to obtain information such as the lithium battery production batch, production time, raw materials, capacity and voltage.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the utility model.

[0032] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0033] Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Mentioning "embodiments" in this article means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present embodiment application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purpose of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lithium battery cover, characterized in that: The invention comprises a cover plate (5), wherein both sides of the cover plate (5) are provided with pole ear holes, and negative electrode rivets (1) and positive electrode rivets (4) are distributed and penetrated in the pole ear holes on both sides of the cover plate (5), wherein the positive electrode rivets (4) are used to rivet the positive and negative electrode blocks (3), the positive electrode conductive sheet (11), the cover plate (5), the lower plastic part (6) and the positive electrode tab connecting piece (7) together, and the negative electrode rivets (1) are used to rivet the positive and negative electrode blocks (3), the negative electrode upper plastic part (2), the cover plate (5), the lower plastic part (6) and the negative electrode tab connecting piece (8) together; the pole ear holes A sealing member (9) is provided inside. Under the action of the positive electrode rivet (4), the lower surface of the sealing member (9) in one of the tab holes is tightly fitted with the positive tab connection piece (7), and the upper surface of the sealing member (9) is tightly fitted with the lower surface of the positive and negative electrode pressing blocks (3) corresponding to the positive tab connection piece (7); under the action of the negative electrode rivet (1), the lower surface of the sealing member (9) in the other tab hole is tightly fitted with the negative tab connection piece (8), and the upper surface of the sealing member (9) is tightly fitted with the lower surface of the positive and negative electrode pressing blocks (3) corresponding to the negative tab connection piece (8).

2. The lithium battery cover according to claim 1, wherein: The lower surface edge and middle portion of the lower plastic part (6) are both provided with protrusions, so that the lower surface of the lower plastic part (6) is formed with recessed portions for respectively accommodating the positive electrode tab connecting piece (7) and the negative electrode tab connecting piece (8).

3. The lithium battery cover according to claim 1, wherein: A liquid injection hole (13) is provided on the cover plate (5), and a crescent groove is provided at one end of the positive and negative electrode pressing blocks (3) close to the liquid injection hole (13).

4. The lithium battery cover according to claim 1, wherein: A two-dimensional code (14) is engraved on the upper surface of the cover plate (5), and the two-dimensional code (14) is used to record parameter information of the lithium battery.

5. The lithium battery cover according to claim 1, characterized in that: An explosion-proof membrane (10) is provided between the upper surface of the middle portion of the lower plastic part (6) and the cover plate (5), and a through hole corresponding to the middle portion of the explosion-proof membrane (10) is provided in the middle portion of the cover plate (5), and an exhaust hole is provided on the lower plastic part (6).

6. The lithium battery cover according to claim 1, characterized in that: Both the positive electrode tab connecting piece (7) and the negative electrode tab connecting piece (8) are provided with tab folding grooves.

Images