Cover plate assembly and battery

Abstract

A cover plate assembly and a battery. The cover plate assembly comprises: a pole (4) made of a first metal and provided with a penetrating portion (43) and an abutting portion (42), the end surface of the end of the penetrating portion (43) away from the abutting portion (42) forming an electrical connection portion (41) used for being electrical connection to the outside; a riveting block (3); and a protective cover (5) made of a second metal, the protective cover (5) being abutted against the electrical connection portion (41) to prevent direct contact between the electrical connection portion (41) and external air, and the oxidation resistance of the second metal being superior to that of the first metal. By providing the protective cover (5), the corrosion of the electrical connection portion (41) can be avoided, and by abutting the protective cover (5) against the electrical connection portion (41), the ON of a circuit can be achieved.

Description

Cover assembly and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 14, 2023, with application number 202311517814.8 and invention name “Cover assembly and battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of battery devices, and in particular to a cover assembly and a battery. Background Art

[0004] The cover is an important component of the battery. It is sealed by isolating the internal and external environments after being welded to the shell. In addition, by arranging conductive electrodes on the cover, the electricity in the internal electrodes of the battery cell can pass through the electrodes as an electrical path, thereby achieving internal and external circuit conduction.

[0005] However, in the prior art, the poles of the cover plate are easily corroded and oxidized by acidic substances due to direct exposure to the air, resulting in corrosion and blackening, which affects the appearance and easily affects the electrical performance.

[0006] Summary of the Invention

[0007] In view of this, the present application provides a cover plate assembly and a battery to solve the problem that the pole is easily corroded and oxidized by acidic substances due to direct exposure to the air.

[0008] In a first aspect, the present application provides a cover plate assembly, comprising:

[0009] The cover body is provided with a through hole;

[0010] The pole is made of a first metal and has an abutting portion abutting against one side of the cover body and a passing portion suitable for passing through the through hole;

[0011] A riveting block is provided on the other side of the cover body and is riveted to the penetration portion;

[0012] An end surface of the protruding portion away from the abutting portion forms an electrical connection portion suitable for electrical connection with the outside, and the electrical connection portion does not overlap with the riveting block;

[0013] The cover assembly also includes:

[0014] a protective cover made of the second metal, the protective cover abutting against the electrical connection portion and being adapted to isolate the electrical connection portion from direct contact with external air;

[0015] The second metal has better oxidation resistance than the first metal.

[0016] Beneficial Effects: The cover assembly provided by the present application has a pole made of a first metal, and an end surface of the pole's protruding portion away from the abutment portion forms an electrical connection portion suitable for external electrical connection. Furthermore, a protective cover is provided to isolate the electrical connection portion from direct contact with the outside air. Furthermore, the protective cover is made of a second metal that has better oxidation resistance than the first metal. This prevents the electrical connection portion from direct contact with air and corrosion, and achieves circuit continuity by abutting the protective cover against the electrical connection portion.

[0017] In an optional embodiment, the first metal includes copper, and the second metal includes aluminum or an aluminum alloy.

[0018] Beneficial Effects: The cover plate assembly provided by this application provides a protective cover on the exterior of the pole, which covers the electrical connection portion of the pole. The protective cover is made of aluminum or an aluminum alloy, thereby utilizing the corrosion resistance of aluminum or an aluminum alloy to reduce corrosion on the copper pole, effectively preventing the pole from corroding and oxidizing when exposed to air. Furthermore, since aluminum or an aluminum alloy is easier to weld, the processing difficulty is reduced.

[0019] In an optional embodiment, along the protruding direction of the protruding portion, the upper surface of the riveting block is arranged higher than the electrical connection portion;

[0020] The peripheral edge of the protective cover is in contact with the rivet block.

[0021] Advantages: By positioning the upper surface of the rivet block higher than the electrical connection portion, the rivet block blocks the rest of the outlet from air, preventing corrosion along the circumferential edge of the outlet portion. Furthermore, after the protective cover is placed over the electrical connection portion, the circumferential edge of the protective cover contacts the rivet block, making it easier to seal the electrical connection portion and prevent it from contacting air.

[0022] In an optional embodiment, the circumferential edge of the protective cover is welded to the rivet block to form a weld mark.

[0023] Beneficial effect: By welding the circumferential edge of the protective cover to the rivet block, the protective cover can be firmly fixed, and at the same time, after the protective cover and the rivet block are welded, a good sealing effect can be achieved to prevent air from entering.

[0024] In an optional embodiment, at least a portion of the electrical connection portion forms a groove;

[0025] The protective cover matches the surface shape of the electrical connection portion;

[0026] The protection cover comprises a positioning portion accommodated in the groove and a covering portion located outside the groove and covering the surface of the electrical connection portion.

[0027] Beneficial Effect: Because the combined unit formed by the terminal and protective cover needs to be electrically connected to an external circuit, to ensure a secure connection, a groove is formed in at least part of the electrical connection portion. The protective cover is then configured to match the surface shape of the electrical connection portion, thereby forming a concave recess in the protective cover. This facilitates connection between the protective cover and the external circuit. Furthermore, during assembly of the protective cover and the electrical connection portion, the groove positions the protective cover, facilitating alignment of the protective cover's circumferential edge with the welding position of the rivet block.

[0028] In an optional embodiment, a plastic piece is further provided between the riveting block and the cover body; the plastic piece is suitable for sealing the gap between the riveting block and the cover body.

[0029] In an optional embodiment, the protective cover is made of the same material as the riveting block.

[0030] Beneficial effect: by making the protective cover and the rivet block of the same material, the welding fusion performance of the two can be improved, and the circumferential edge of the protective cover and the rivet block can be conveniently laser-welded.

[0031] In an optional embodiment, the riveting block and the cover plate body are made of the same material.

[0032] In an optional embodiment, the weld mark is formed by laser welding.

[0033] In a second aspect, the present application further provides a battery, comprising a shell, a battery cell disposed in the shell, and a cover assembly as described above covering the opening of the shell.

[0034] Because the battery includes a cover plate assembly, it has the same effect as the cover plate assembly and is not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a schematic diagram of a cover plate assembly of the present application;

[0037] FIG2 is a schematic cross-sectional view of the cover plate assembly of the present application in a front view;

[0038] FIG3 is an enlarged view of point A in FIG2 .

[0039] Explanation of the accompanying reference numerals: 1. Cover plate body; 11. Liquid injection hole; 12. Through hole; 2. Plastic part; 3. Riveting block; 4. Pole; 41. Electrical connection part; 42. Abutment part; 43. Penetration part; 5. Protective cover; 51. Covering part; 52. Positioning part; 6. Welding mark. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] The following describes an embodiment of the present application in conjunction with Figures 1 to 3.

[0045] According to an embodiment of the present application, on one hand, a cover plate assembly is provided, comprising:

[0046] The cover body 1 is provided with a through hole 12;

[0047] The pole 4 is made of the first metal and has an abutting portion 42 abutting against one side of the cover body 1 and a passing portion 43 suitable for passing through the through hole 12;

[0048] The riveting block 3 is provided on the other side of the cover body 1 and is riveted to the penetration portion 43;

[0049] An end surface of the protruding portion 43 away from the abutting portion 42 forms an electrical connection portion 41 suitable for electrical connection with the outside, and the electrical connection portion 41 does not overlap with the riveting block 3;

[0050] The cover assembly also includes:

[0051] The protective cover 5 is made of the second metal, the protective cover 5 abuts against the electrical connection portion 41 and is suitable for isolating the electrical connection portion 41 from direct contact with the external air;

[0052] The second metal has better oxidation resistance than the first metal.

[0053] The cover assembly provided in the embodiment of the present application can be covered on the battery shell, and the cover assembly is provided with a pole 4. The power of the internal pole of the battery cell is transferred through the pole 4 as an electrical path to achieve internal and external circuit conduction.

[0054] In order to ensure good electrical conductivity of the pole 4 , the pole 4 is made of a first metal. In this embodiment, the first metal may be copper.

[0055] The pole 4 has an abutting portion 42 abutting against one side of the cover body 1 , and the abutting portion 42 is suitable for connecting with the tab of the battery cell.

[0056] The cover body 1 is provided with a through hole 12 , and the pole 4 has a protruding portion 43 passing through the through hole 12 ; thereby facilitating the pole 4 to be provided on both sides of the cover body 1 to form conduction between the internal and external circuits.

[0057] The rivet block 3 is provided on the other side of the cover body 1 and is riveted to the penetration portion 43 ; thereby the pole 4 can be fixed to the cover body 1 to prevent it from falling off.

[0058] The riveting block 3 is also provided with a via hole corresponding to the through hole 12 , thereby facilitating electrical connection between the pole 4 and the outside.

[0059] An end surface of the protruding portion 43 away from the abutting portion 42 forms an electrical connection portion 41 suitable for external electrical connection, and the electrical connection portion 41 does not overlap with the rivet block 3; so that the electrical connection portion 41 cannot be covered by the rivet block 3. Since the material of the pole 4 is copper, if there is no other component to cover the electrical connection portion 41 of the pole 4, it is easy for the electrical connection portion 41 to come into contact with the air. If directly exposed to the air, it is easy to be corroded and oxidized by acidic substances, resulting in corrosion and blackening, which affects the appearance and easily affects the electrical performance.

[0060] The protective cover 5 is provided to isolate the electrical connection portion 41 from direct contact with the outside air; thereby, direct contact between the electrical connection portion 41 and the air can be avoided, thereby preventing the electrical connection portion 41 from being corroded.

[0061] Furthermore, the protective cover 5 is made of a second metal, which has better oxidation resistance than the first metal, thereby more effectively avoiding oxidation of the protective cover 5 and preventing oxidation of the electrical connection portion 41 .

[0062] In the cover plate assembly provided in the embodiments of the present application, the pole 4 is made of a first metal. The end surface of the protruding portion 43 of the pole 4, away from the abutment portion 42, forms an electrical connection portion 41 suitable for external electrical connection. A protective cover 5 is provided to isolate the electrical connection portion 41 from direct contact with the outside air. The protective cover 5 is made of a second metal that has better oxidation resistance than the first metal. This prevents direct contact between the electrical connection portion 41 and air, thus preventing corrosion of the electrical connection portion 41. Furthermore, the abutment between the protective cover 5 and the electrical connection portion 41 ensures electrical continuity.

[0063] In some embodiments, the first metal includes copper and the second metal includes aluminum or an aluminum alloy.

[0064] Pole 4 is made of copper. Although it has good conductivity, the pure copper pole is easily corroded and oxidized by various acidic substances when directly exposed to the air, resulting in corrosion and blackening. After being connected to the external circuit, the laser welding area is prone to corrosion and falling off, affecting the appearance and possibly affecting the electrical performance.

[0065] The cover plate assembly provided in the embodiment of the present application is provided with a protective cover 5 on the exterior of the pole 4. The protective cover 5 covers the electrical connection portion 41 of the pole 4. The protective cover 5 is made of aluminum or an aluminum alloy. This utilizes the corrosion resistance of aluminum or an aluminum alloy to reduce corrosion on the copper pole 4, effectively preventing the pole 4 from corroding and oxidizing when exposed to air. Furthermore, since aluminum or an aluminum alloy is easier to weld, the processing difficulty is reduced.

[0066] In some embodiments, as shown in FIG3 , along the protruding direction of the protruding portion 43 , the upper surface of the riveting block 3 is higher than the electrical connection portion 41 ;

[0067] The peripheral edge of the protective cover 5 is in contact with the rivet block 3 .

[0068] By making the upper surface of the rivet block 3 higher than the electrical connection portion 41 , the rivet block 3 can block contact between other areas of the through-hole 43 and air, thereby preventing corrosion of the circumferential edge of the through-hole 43 .

[0069] At the same time, since the upper surface of the riveted block 3 is arranged higher than the electrical connection part 41, after the protective cover 5 is placed on the electrical connection part 41, the circumferential edge of the protective cover 5 can be in contact with the riveted block 3, making it easier to seal the electrical connection part 41 and prevent the electrical connection part 41 from contacting the air.

[0070] In some embodiments, as shown in FIG. 3 , the circumferential edge of the protective cover 5 is welded to the rivet block 3 to form a weld mark 6 .

[0071] By welding the circumferential edge of the protective cover 5 to the riveted block 3 , the protective cover 5 can be securely fixed. At the same time, after the protective cover 5 and the riveted block 3 are welded, a good sealing effect can be achieved to prevent air from entering.

[0072] Additionally, the protective cover 5 may be bonded to the electrical connection portion 41 or the riveting block 3. The bonding adhesive layer may be made of conductive adhesive.

[0073] In some embodiments, as shown in FIG3 , at least a portion of the electrical connection portion 41 forms a groove;

[0074] The protective cover 5 matches the surface shape of the electrical connection portion 41;

[0075] The protective cover 5 includes a positioning portion 52 received in the groove, and a covering portion 51 located outside the groove and covering the surface of the electrical connection portion 41 .

[0076] Since the combined unit formed by the pole 4 and the protective cover 5 needs to be connected to the external circuit, in order to ensure a firm connection, a groove is formed in at least a part of the electrical connection part 41, and the surface shape of the protective cover 5 is matched with that of the electrical connection part 41, so that the protective cover 5 is also formed in a pit form, which facilitates the connection between the protective cover 5 and the external circuit.

[0077] At the same time, a groove is formed in at least part of the electrical connection portion 41 , so that when the protective cover 5 and the electrical connection portion 41 are assembled, the groove can position the protective cover 5 , thereby facilitating alignment of the circumferential edge of the protective cover 5 with the welding position of the rivet block 3 .

[0078] The protective cover 5 has a positioning portion 52 accommodated in the groove, and a covering portion 51 located outside the groove and covering the surface of the electrical connection portion 41. While ensuring the positioning effect, it can ensure that the protective cover 5 covers the electrical connection portion 41, and after the circumferential edge of the protective cover 5 is welded to the rivet block 3, the electrical connection portion 41 is effectively prevented from contacting the air.

[0079] In some embodiments, as shown in FIG. 3 , a plastic part 2 is further provided between the riveting block 3 and the cover body 1 ; the plastic part 2 is suitable for sealing the gap between the riveting block 3 and the cover body 1 .

[0080] The plastic part 2 is arranged between the riveting block 3 and the cover body 1 and can also play an insulating role to prevent the pole 4 and the cover body 1 from being connected and preventing a short circuit.

[0081] The cover assembly provided in the embodiment of the present application has a specific preparation process as follows: first, the pole 4 is passed through the through hole 12 of the cover body 1, and the protrusion 43 is passed through the plastic part 2 and the rivet block 3 in turn, and then the rivet block 3 and the protrusion 43 of the pole 4 are riveted, and then the protective cover 5 is covered on the surface of the electrical connection part 41, and the circumferential edge of the protective cover 5 is laser welded to the rivet block 3 to achieve the sealing of the electrical connection part 41 by the protective cover 5 to prevent the electrical connection part 41 from contacting the air.

[0082] In some embodiments, the protective cover 5 and the riveting block 3 are made of the same material.

[0083] The protective cover 5 and the riveted block 3 are made of the same material. Specifically, both the protective cover 5 and the riveted block 3 can be made of aluminum or an aluminum alloy. By making the protective cover 5 and the riveted block 3 of the same material, the welding performance between the two can be improved, and the laser welding of the circumferential edge of the protective cover 5 to the riveted block 3 can be facilitated.

[0084] In some embodiments, the riveting block 3 and the cover body 1 are made of the same material.

[0085] The cover body 1 can also be made of aluminum or aluminum alloy, which has high strength and good corrosion resistance.

[0086] In some embodiments, the weld mark 6 is formed by laser welding.

[0087] According to an embodiment of the present application, on the other hand, a battery is provided, including: a shell, a battery cell arranged in the shell, and a cover plate assembly as described above covering the opening of the shell.

[0088] In the battery provided in the embodiment of the present application, the terminal 4 is made of a first metal. The end surface of the protruding portion 43 of the terminal 4, away from the abutment portion 42, forms an electrical connection portion 41 suitable for external electrical connection. A protective cover 5 is provided to isolate the electrical connection portion 41 from direct contact with the outside air. The protective cover 5 is made of a second metal with better oxidation resistance than the first metal. This prevents direct contact between the electrical connection portion 41 and air, thus preventing corrosion of the electrical connection portion 41. Furthermore, the abutment between the protective cover 5 and the electrical connection portion 41 achieves circuit continuity.

[0089] Additionally, a liquid injection hole 11 is provided on the cover body 1 to facilitate liquid injection into the battery through the liquid injection hole 11 .

[0090] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined in the present application.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate body, on which a through hole is formed; A pole, made of a first metal, having an abutting portion abutting against one side of the cover body, and a passing portion suitable for passing through the through hole; A riveting block is disposed on the other side of the cover body and is riveted to the penetration portion; An end surface of the penetration portion away from the abutting portion forms an electrical connection portion suitable for electrical connection with the outside, and the electrical connection portion does not overlap with the riveting block; The cover plate assembly also includes: A protective cover, made of a second metal, the protective cover abuts against the electrical connection portion and is suitable for isolating the electrical connection portion from direct contact with external air; The second metal has better oxidation resistance than the first metal.

2. The cover plate assembly according to claim 1, characterized in that: The first metal includes copper, and the second metal includes aluminum or an aluminum alloy.

3. The cover plate assembly according to claim 1, characterized in that: Along the protruding direction of the protruding portion, the upper surface of the riveting block is arranged higher than the electrical connecting portion; The peripheral edge of the protection cover contacts the riveting block.

4. The cover plate assembly according to claim 3, characterized in that: The circumferential edge of the protective cover is welded to the rivet block to form a weld mark.

5. The cover plate assembly according to claim 1, characterized in that: At least a portion of the electrical connection portion forms a groove; The protective cover matches the surface shape of the electrical connection portion; The protection cover comprises a positioning portion accommodated in the groove, and a covering portion located outside the groove and covering the surface of the electrical connection portion.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: A plastic piece is also arranged between the riveting block and the cover body; the plastic piece is suitable for sealing the gap between the riveting block and the cover body.

7. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The protective cover is made of the same material as the riveting block.

8. The cover plate assembly according to claim 7, characterized in that: The riveting block is made of the same material as the cover plate body.

9. The cover plate assembly according to claim 4, characterized in that: The weld mark is formed by laser welding.

10. A battery, characterized in that: It comprises a shell, a battery cell arranged in the shell, and a cover plate assembly as described in any one of claims 1 to 9 covering the opening of the shell.

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