Cover plate assembly and battery

Abstract

The utility model relates to the technical field of power batteries, in particular to a cover plate assembly which comprises a conductive block and a pole, the pole comprises an insertion section and a main body section, the insertion section is inserted in a through hole of the conductive block and riveted with the conductive block, and the main body section is positioned at one end, close to the interior of a battery, of the insertion section. The first end face, facing the exterior of the battery, of the main body section is perpendicular to the axial direction of the main body section, the conductive block is provided with a second end face, the second end face is arranged facing the interior of the battery, a protruding part is arranged on one of the first end face and the second end face, a groove is formed in the other end face, and the protruding part is inserted into the groove in an interference mode. The utility model also provides a battery which comprises a box body and the cover plate assembly, and the cover plate assembly is connected to the opening of the box body, so that the cover plate assembly and the box body form a shell of the battery. The cover plate assembly and the battery can ensure the stability of the internal resistance of the battery, reduce the production cost and improve the production efficiency.

Description

Technical Field

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

[0002] The cover assembly of the power lithium-ion battery is provided with positive and negative electrodes for outputting electricity to the outside, and poles and conductive blocks are provided at the positive and negative poles respectively. To ensure the reliability of the internal resistance, the poles and conductive blocks are riveted together. After riveting, the poles and conductive blocks will be laser welded to prevent the riveting between the poles and the conductive blocks from loosening and causing fluctuations in the internal resistance of the battery. Laser welding itself is volatile, so the yield rate of the process and the corresponding cost will be affected, and laser welding takes a long time, which will also affect production efficiency.

[0003] Therefore, there is an urgent need for a cover plate assembly and a battery to solve the above problems. Utility Model Content

[0004] One purpose of the utility model is to provide a cover plate assembly, which can ensure the stability of the internal resistance of the battery, reduce production costs and improve production efficiency.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Provided is a cap assembly, comprising a conductive block and a pole, wherein the pole comprises an insertion section and a main section, wherein the insertion section is inserted in a through hole of the conductive block, the insertion section is riveted to the conductive block, and the main section is located at one end of the insertion section close to the inside of a battery;

[0007] The first end face of the main body segment facing the outside of the battery is perpendicular to the axial direction of the main body segment, the conductive block has a second end face, the second end face is arranged toward the inside of the battery, a protrusion is arranged on one of the first end face and the second end face, and a groove is opened on the other, and the protrusion is inserted into the groove with interference fit.

[0008] Optionally, the protrusion is an annular protrusion, and the groove is an annular groove.

[0009] Optionally, the cross-section of the annular protrusion is trapezoidal, the end width of the annular protrusion is smaller than the width of the root of the annular protrusion, the cross-section of the annular groove is trapezoidal, and the width of the bottom of the annular groove is smaller than the width of the notch of the annular groove.

[0010] Optionally, a plurality of the protrusions and the grooves are provided, and the plurality of protrusions are interference-inserted in the plurality of grooves in a one-to-one correspondence.

[0011] Optionally, all of the protrusions are arranged on the first end surface, and all of the grooves are opened on the second end surface;

[0012] Or all of the protrusions are arranged on the second end surface, and all of the grooves are opened on the first end surface;

[0013] Or part of the protrusions and part of the grooves are arranged on the first end surface, and the rest of the protrusions and the rest of the grooves are arranged on the second end surface.

[0014] Optionally, the protrusion is a frustoconical protrusion, the area of ​​the end of the frustoconical protrusion is smaller than the area of ​​the root of the frustoconical protrusion, and the groove is a frustoconical groove, the area of ​​the bottom of the frustoconical groove is smaller than the area of ​​the notch of the frustoconical groove.

[0015] Optionally, a plurality of the protrusions are evenly spaced to form an annular protrusion group, and the center of the annular protrusion group is located on the axis of the main body segment.

[0016] Optionally, the insertion section includes a riveted protruding section and a connecting section, one end of the connecting section is connected to the riveted protruding section, and the other end is connected to the main section, and the diameter of the riveted protruding section is larger than the diameter of the connecting section.

[0017] Optionally, it also includes a cover member, a first insulating member and a second insulating member, the conductive block is arranged on the side of the cover member facing the outside of the battery, the first insulating member is clamped between the conductive block and the cover member, the second insulating member is sleeved on the pole, and the second insulating member is partially inserted into the assembly hole of the cover member.

[0018] Another object of the utility model is to provide a battery that can ensure the stability of the internal resistance of the battery, reduce production costs, and improve production efficiency.

[0019] To achieve this purpose, the utility model adopts the following technical solutions:

[0020] A battery is provided, comprising a box body and the above-mentioned cover plate assembly, wherein the cover plate assembly is connected to the opening of the box body so that the cover plate assembly and the box body form a shell of the battery.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a cover plate assembly, including a conductive block and a pole, the pole including an insertion section and a main body section, the insertion section is inserted in the through hole of the conductive block, the insertion section is riveted to the conductive block, and the main body section is located at one end of the insertion section close to the inside of the battery. The first end face of the main body section facing the outside of the battery is perpendicular to the axial direction of the main body section, the conductive block has a second end face, the second end face is arranged toward the inside of the battery, one of the first end face and the second end face is provided with a protrusion, the other is provided with a groove, and the protrusion is inserted in the groove with interference fit. The insertion section of the cover plate assembly is no longer laser welded to the conductive block, but through riveting and interference fit between the protrusion and the groove, good contact between the pole and the conductive block is ensured, thereby ensuring the stability of the internal resistance of the battery. And because laser welding is not required, production costs can be reduced and production efficiency can be improved.

[0023] The utility model also provides a battery, comprising a box body and the above-mentioned cover assembly, wherein the cover assembly is connected to the opening of the box body so that the cover assembly and the box body form a battery shell. The battery can ensure the stability of the internal resistance of the battery, reduce production costs, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a cover plate assembly provided by an embodiment of the utility model from a first perspective;

[0025] Figure 2 is a structural schematic diagram of a cover plate assembly provided by an embodiment of the utility model from a second viewing angle;

[0026] Figure 3 yes Figure 2 AA section view in;

[0027] Figure 4 yes Figure 3 The enlarged view of point B in the middle;

[0028] Figure 5 It is a partial structural exploded diagram of the cover plate assembly provided by the embodiment of the utility model from a third perspective;

[0029] Figure 6 It is a partial structural exploded diagram of the cover assembly provided by the embodiment of the utility model from a fourth perspective.

[0030] In the figure:

[0031] 1. conductive block; 11. second end surface; 111. annular protrusion;

[0032] 2. Pole; 21. Insertion section; 211. Riveted protruding section; 212. Connecting section; 22. Main body section; 221. First end face; 2211. Annular groove;

[0033] 3. Cover plate; 31. Liquid injection hole; 4. First insulating member; 5. Second insulating member; 6. Explosion-proof valve. DETAILED DESCRIPTION

[0034] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] like Figure 1-Figure 6 As shown, the cover plate assembly of this embodiment includes a conductive block 1 and a pole 2, the pole 2 includes an insertion section 21 and a main section 22, the insertion section 21 is inserted in the through hole of the conductive block 1, the insertion section 21 is riveted to the conductive block 1, and the main section 22 is located at one end of the insertion section 21 close to the inside of the battery. The first end face 221 of the main section 22 facing the outside of the battery is perpendicular to the axial direction of the main section 22, the conductive block 1 has a second end face 11, the second end face 11 is arranged toward the inside of the battery, one of the first end face 221 and the second end face 11 is provided with a protrusion, and the other is provided with a groove, and the protrusion is inserted in the groove with interference fit. The insertion section 21 of the cover plate assembly is no longer laser welded with the conductive block 1, but is riveted with the conductive block 1 by the insertion section 21, and the interference fit between the protrusion and the groove ensures good contact between the pole 2 and the conductive block 1, thereby ensuring the stability of the internal resistance of the battery. And because laser welding is not required, the cover plate assembly can reduce production costs and improve production efficiency.

[0038] like Figure 5-Figure 6 As shown, optionally, in this embodiment, the protrusion is an annular protrusion 111 and the groove is an annular groove 2211.

[0039] like Figure 4 As shown, optionally, the cross section of the annular protrusion 111 is a trapezoid, the width of the end of the annular protrusion 111 is smaller than the width of the root of the annular protrusion 111, the cross section of the annular groove 2211 is a trapezoid, and the width of the groove bottom of the annular groove 2211 is smaller than the width of the notch of the annular groove 2211. Optionally, the cross sections of the annular protrusion 111 and the annular groove 2211 are both isosceles trapezoids.

[0040] Optionally, of course, in other embodiments, the protrusions and grooves may not be provided as annular structures, but may be provided in plurality, and the plurality of protrusions are inserted into the plurality of grooves in a one-to-one interference pattern. Optionally, all protrusions are provided on the first end face 221, and all grooves are provided on the second end face 11. Optionally, all protrusions are provided on the second end face 11, and all grooves are provided on the first end face 221. Optionally, some protrusions and some grooves are provided on the first end face 221, and the remaining protrusions and the remaining grooves are provided on the second end face 11.

[0041] Optionally, when there are multiple protrusions and grooves, the protrusion may be a frustoconical protrusion, the area of ​​the end of the frustoconical protrusion is smaller than the area of ​​the root of the frustoconical protrusion, and the groove is a frustoconical groove, the area of ​​the bottom of the frustoconical groove is smaller than the area of ​​the notch of the frustoconical groove.

[0042] In order to ensure the balance of the connection between the pole 2 and the conductive block 1 at all places, optionally, multiple protrusions are evenly spaced to form an annular protrusion group, and the center of the annular protrusion group is located on the axis of the main body section 22. Of course, multiple annular protrusion groups can also be provided, and the multiple annular protrusion groups are concentrically arranged and have different diameters.

[0043] Optionally, the insertion section 21 includes a riveted protruding section 211 and a connecting section 212, one end of the connecting section 212 is connected to the riveted protruding section 211, and the other end is connected to the main section 22, and the diameter of the riveted protruding section 211 is larger than the diameter of the connecting section 212. The inner wall of the through hole of the conductive block 1 is correspondingly provided with a sunken groove to match the riveted protruding section 211.

[0044] like Figure 5-Figure 6As shown, optionally, the cover assembly further includes a cover member 3, a first insulating member 4 and a second insulating member 5, the conductive block 1 is arranged on the side of the cover member 3 facing the outside of the battery, and the first insulating member 4 is sandwiched between the conductive block 1 and the cover member 3. Optionally, the first insulating member 4 is provided with a first positioning groove, and the conductive block 1 is arranged in the first positioning groove. Optionally, the conductive block 1 is a bare aluminum block. Optionally, a second positioning groove is provided on the cover member 3, and the first insulating member 4 is arranged in the second positioning groove. The first insulating member 4 can ensure the insulation setting between the conductive block 1 and the cover member 3.

[0045] Optionally, the second insulating member 5 is sleeved on the pole 2, and part of the second insulating member 5 is inserted in the assembly hole of the cover member 3. The assembly hole is opened at the bottom of the second positioning groove, and the second insulating member 5 can ensure the insulation between the pole 2 and the cover member 3.

[0046] Optionally, the positive electrode column 2 and the positive conductive block 1 of the cover assembly may have the above-mentioned protrusion and groove matching structure, or the negative electrode column 2 and the negative conductive block 1 of the cover assembly may have the above-mentioned protrusion and groove matching structure, or the positive electrode column 2, the positive conductive block 1, the negative electrode column 2 and the negative conductive block 1 of the cover assembly all have the above-mentioned protrusion and groove matching structure.

[0047] The cover plate assembly eliminates the laser welding after the pole 2 and the conductive block 1 are riveted. The prior art specifically performs laser welding between the riveted protruding section 211 and the inner wall of the through hole. The cover plate assembly provided in this embodiment can ensure the stability of the internal resistance of the battery by providing a reliable flow-conducting structure on the pole 2 and the conductive block 1, that is, an interference fit structure between the protrusion and the groove. During the riveting process between the pole 2 and the conductive block 1, the protrusion and the groove will be squeezed and matched to form a firm and reliable flow-conducting path, thereby ensuring the stability of the internal resistance at the cover plate assembly after the laser welding is eliminated. At the same time, different flow-through cross sections can be set to meet different flow-through requirements. Increasing the flow-through cross section, improving the flow-through capacity, and reducing the flow-through cross section can play the role of a fuse.

[0048] This embodiment also provides a battery, including a box body and the above-mentioned cover assembly, the cover assembly is connected to the opening of the box body, so that the cover assembly and the box body form a battery shell. The battery can ensure the stability of the internal resistance of the battery, reduce production costs, and improve production efficiency.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A cover plate assembly, characterized in that: The invention comprises a conductive block (1) and a pole (2), wherein the pole (2) comprises an insertion section (21) and a main section (22), wherein the insertion section (21) is inserted into a through hole of the conductive block (1), the insertion section (21) is riveted to the conductive block (1), and the main section (22) is located at an end of the insertion section (21) close to the interior of the battery; The first end face (221) of the main body section (22) facing the outside of the battery is perpendicular to the axial direction of the main body section (22); the conductive block (1) has a second end face (11), the second end face (11) is arranged facing the inside of the battery, one of the first end face (221) and the second end face (11) is provided with a protrusion, and the other is provided with a groove, and the protrusion is inserted into the groove in an interference fit manner.

2. The cover plate assembly according to claim 1, characterized in that: The protrusion is an annular protrusion (111), and the groove is an annular groove (2211).

3. The cover plate assembly according to claim 2, characterized in that: The cross section of the annular protrusion (111) is trapezoidal, the width of the end of the annular protrusion (111) is smaller than the width of the root of the annular protrusion (111), the cross section of the annular groove (2211) is trapezoidal, and the width of the bottom of the annular groove (2211) is smaller than the width of the notch of the annular groove (2211).

4. The cover plate assembly according to claim 1, characterized in that: A plurality of the protrusions and the grooves are provided, and the plurality of protrusions are interference-inserted in the plurality of grooves in a one-to-one correspondence.

5. The cover plate assembly according to claim 4, characterized in that: All of the protrusions are arranged on the first end surface (221), and all of the grooves are opened on the second end surface (11); Or all of the protrusions are arranged on the second end surface (11), and all of the grooves are opened on the first end surface (221); Or part of the protrusions and part of the grooves are arranged on the first end surface (221), and the rest of the protrusions and the rest of the grooves are arranged on the second end surface (11).

6. The cover plate assembly according to claim 4, characterized in that: The protrusion is a frustum-shaped protrusion, the area of ​​the end of the frustum-shaped protrusion is smaller than the area of ​​the root of the frustum-shaped protrusion, and the groove is a frustum-shaped groove, the area of ​​the bottom of the frustum-shaped groove is smaller than the area of ​​the notch of the frustum-shaped groove.

7. The cover plate assembly according to claim 4, characterized in that: The plurality of protrusions are evenly spaced to form an annular protrusion group, the center of which is located on the axis of the main body section (22).

8. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The insertion section (21) comprises a riveted protruding section (211) and a connecting section (212), one end of the connecting section (212) is connected to the riveted protruding section (211), and the other end is connected to the main section (22), and the diameter of the riveted protruding section (211) is greater than the diameter of the connecting section (212).

9. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The battery further comprises a cover plate member (3), a first insulating member (4) and a second insulating member (5); the conductive block (1) is arranged on a side of the cover plate member (3) facing the outside of the battery; the first insulating member (4) is sandwiched between the conductive block (1) and the cover plate member (3); the second insulating member (5) is sleeved on the pole (2); and a portion of the second insulating member (5) is inserted into the assembly hole of the cover plate member (3).

10. A battery, characterized in that It comprises a box body and a cover assembly as claimed in any one of claims 1 to 9, wherein the cover assembly is connected to the opening of the box body so that the cover assembly and the box body form a shell of the battery.

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