Top cover, battery and electronic equipment

Abstract

The invention provides a top cover which comprises a pole, a pole welding plate, a polished aluminum sheet and a sealing ring, and the polished aluminum sheet, the sealing ring and the pole welding plate are sequentially arranged. The polished aluminum sheet is provided with a pole hole; at least part of the pole welding plate is projected on the light aluminum sheet; the pole is arranged in the pole hole in a penetrating manner and is welded with the pole welding plate; a first pressing and holding edge part is arranged on the post terminal, the first pressing and holding edge part faces the post terminal welding plate, and at least part of the first pressing and holding edge part is projected on the post terminal welding plate; one surface of the sealing ring away from the smooth aluminum sheet abuts against the pole welding plate, and two ends of one surface of the sealing ring close to the smooth aluminum sheet abut against the smooth aluminum sheet and the first pressing edge part respectively. The first pressing edge part and the smooth aluminum sheet are respectively abutted against the edge of the sealing ring, and the sealing ring seals the gap between the smooth aluminum sheet and the pole by utilizing the pressing force of the pole and the smooth aluminum sheet on the sealing ring, so that the sealing performance of the sealing ring on the battery cell is improved, and the risk of liquid leakage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a top cover, a battery and an electronic device. Background Art

[0002] In order to improve the safety performance of the battery cell, the industry gradually adopts composite plate poles to replace friction welding poles to reduce the risk of pole falling off. The copper layer of the composite plate pole is usually located on the upper surface of the bare aluminum sheet, and the composite interface is less stressed, and the reliability is higher.

[0003] In the existing battery cell processing scheme, the sealing ring is set between the bare aluminum sheet and the welding substrate, and the side of the sealing ring abuts against the side of the pole. The pole is sealed by welding with the edge of the welding substrate. However, the sealing ring only seals between the bare aluminum sheet and the welding substrate. If there is a cold weld or a burst point between the pole and the welding substrate, the electrolyte in the battery may flow out through the gap between the sealing ring and the pole, causing leakage of the battery cell. Summary of the invention

[0004] Based on this, it is necessary to provide a top cover, a battery and an electronic device to address the above technical problems.

[0005] A top cover, comprising: a pole, a pole welding plate, a plain aluminum sheet and a sealing ring, wherein the plain aluminum sheet, the sealing ring and the pole welding plate are arranged in sequence;

[0006] The plain aluminum sheet is provided with a pole hole;

[0007] The pole welding plate is at least partially projected onto the bare aluminum sheet;

[0008] The pole is inserted into the pole hole and welded to the pole welding plate;

[0009] The pole is provided with a first pressing edge, the first pressing edge faces the pole welding plate, and the first pressing edge is at least partially projected onto the pole welding plate;

[0010] The sealing ring has a side away from the bare aluminum sheet butted against the pole welding plate, and two ends of a side of the sealing ring close to the bare aluminum sheet butted against the bare aluminum sheet and the first pressing edge portion respectively.

[0011] In one embodiment, a second pressing edge is further provided on the side of the pole, the second pressing edge is closer to the pole welding plate relative to the first pressing edge, and the second pressing edge abuts against an edge of the pole welding plate close to the bare aluminum sheet.

[0012] In one of the embodiments, a projected length of the first pressing edge on the pole welding plate is smaller than a width of the sealing ring.

[0013] In one of the embodiments, an abutting edge is provided on the pole, a plane where the abutting edge is located intersects with the plain aluminum sheet, and a side surface of the sealing ring abuts against the abutting edge.

[0014] In one embodiment, it further comprises an upper plastic ring, the upper plastic ring is used to surround the side of the pole, and the upper plastic ring is provided with an extended edge portion;

[0015] The pole is provided with a third pressing edge, and the third pressing edge is farther away from the sealing ring than the first pressing edge;

[0016] The extended edge is arranged between the third pressing edge and the plain aluminum sheet, the first surface of the extended edge is used to face away from the plain aluminum sheet, the second surface of the extended edge is parallel to the plain aluminum sheet, the first surface of the extended edge abuts against the third pressing edge, and the second surface of the extended edge abuts against the plain aluminum sheet.

[0017] In one embodiment, a blocking edge is protruding from a side of the smooth aluminum sheet facing away from the sealing ring, a limiting edge is provided on a side of the upper plastic ring facing away from the pole, the limiting edge is recessed in a side of the upper plastic ring facing away from the pole, and the blocking edge abuts against the limiting edge.

[0018] In one of the embodiments, a bearing edge is protruded from a side of the upper plastic ring facing the pole, and a side of the bearing edge facing away from the plain aluminum sheet is used to abut against an edge of the pole.

[0019] In one of the embodiments, it also includes a lower plastic ring, which is arranged between the bare aluminum sheet and the top surface of the battery, and a plastic ring edge is provided on the side of the lower plastic ring facing the pole, and a first surface of the plastic ring edge abuts against a side of the bare aluminum sheet facing the sealing ring, and a second surface of the plastic ring edge abuts against a side of the pole welding plate facing the bare aluminum sheet.

[0020] A battery comprises a battery body and a top cover as described in any one of the above embodiments, wherein the lower plastic ring is arranged on the top of the battery body, the bare aluminum sheet is arranged on the side of the lower plastic ring facing away from the battery body, the upper plastic ring surrounds the outside of the positive electrode column and the negative electrode and abuts against the positive electrode column and the negative electrode column, an extended edge is arranged on the edge of one end of the positive electrode column and the negative electrode column away from the top of the battery, the extended edge abuts against the bearing edge, a negative electrode column is arranged in the top cover, and the negative electrode column comprises a copper-aluminum composite layer formed by tightly connecting a metal copper layer and a metal aluminum layer.

[0021] An electronic device comprises the battery mentioned above.

[0022] The above-mentioned top cover, battery and electronic device are configured with a first pressing edge on the pole, and the first pressing edge and the plain aluminum sheet respectively abut against the edge of the sealing ring. The sealing ring seals the gap between the plain aluminum sheet and the pole by utilizing the pressing force of the first pressing edge and the plain aluminum sheet on the sealing ring, thereby improving the sealing performance of the sealing ring on the battery cell and reducing the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional exploded schematic diagram of a top cover structure in an embodiment;

[0024] Figure 2 A partial cross-sectional view of the position of the negative electrode column in the top cover structure in one embodiment;

[0025] Figure 3 An exploded cross-sectional view of the position of the negative pole in the top cover structure in one embodiment.

[0026] 100, pole; 101, metal copper layer; 102, metal aluminum layer; 110, first pressing edge; 120, abutting edge; 130, second pressing edge; 140, snap-in notch; 150, third pressing edge; 200, pole welding plate; 300, plain aluminum sheet; 310, blocking edge; 400, sealing ring; 500, upper plastic ring; 510, extending edge; 520, limiting edge; 530, bearing edge; 600, lower plastic ring; 610, plastic ring edge. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] Embodiment 1

[0029] In this embodiment, Figure 1 As shown, a top cover is provided, which includes: a pole 100, a pole welding plate 200, a bare aluminum sheet 300 and a sealing ring 400, wherein the bare aluminum sheet 300, the sealing ring 400 and the pole welding plate 200 are arranged in sequence;

[0030] The light aluminum sheet 300 is provided with a pole hole;

[0031] The pole welding plate 200 is at least partially projected onto the bare aluminum sheet 300;

[0032] The pole 100 is inserted into the pole hole and welded to the pole welding plate 200;

[0033] The pole 100 is provided with a first pressing edge 110, the first pressing edge 110 faces the pole welding plate 200, and the first pressing edge 110 is at least partially projected onto the pole welding plate 200;

[0034] The sealing ring 400 has a surface away from the bare aluminum sheet 300 abutting against the pole welding plate 200 , and the sealing ring 400 has two ends abutting against the bare aluminum sheet 300 and the first pressing edge 110 respectively.

[0035] In this embodiment, the bare aluminum sheet 300, the sealing ring 400, and the pole welding plate 200 are sequentially arranged and installed on the top surface of the battery. Among them, a pole hole is opened on the surface of the bare aluminum sheet 300. The pole welding plate 200 is arranged around the side of the end of the pole 100 close to the top surface of the battery, and the side of the pole welding plate 200 is welded to the edge of the end of the pole 100 close to the top surface of the battery. The first surface of the pole welding plate 200 is connected to the top surface of the battery, and the second surface of the pole welding plate 200 faces the bare aluminum sheet 300, and a gap is reserved between the second surface of the pole welding plate 200 and the bare aluminum sheet 300 facing the top surface of the battery. Among them, the first surface and the second surface of the pole welding plate 200 are arranged back to back. The pole welding plate 200 is at least partially projected on the bare aluminum sheet 300.

[0036] The pole 100 passes through the pole hole, and a first pressing edge 110 is provided on the side of the pole 100. The first pressing edge 110 is parallel to the second surface of the pole welding plate 200, and the first pressing edge 110 is at least partially projected on the pole welding plate 200. The projection area of ​​the pole welding plate 200 on the bare aluminum sheet 300 does not intersect with the projection area of ​​the first pressing edge 110 on the pole welding plate 200.

[0037] The sealing ring 400 is disposed in the gap between the bare aluminum sheet 300 and the pole welding plate 200, and the first surface of the sealing ring 400 abuts against the second surface of the pole welding plate 200, one side of the second surface of the sealing ring 400 abuts against the side of the first pressing edge 110 facing the pole welding plate 200, and the other side of the second surface of the sealing ring 400 abuts against the side of the bare aluminum sheet 300 facing the pole welding plate 200. The sealing ring 400 seals the gap between the bare aluminum sheet 300 and the pole 100 by using the pressing force of the first pressing edge 110 and the bare aluminum sheet 300, thereby improving the sealing performance of the sealing ring 400 on the battery cell and reducing the risk of leakage.

[0038] like Figure 2 and Figure 3As shown, in one embodiment, a second pressing edge 130 is further provided on the side of the pole 100, and the second pressing edge 130 is close to the pole welding plate 200 relative to the first pressing edge 110, and the second pressing edge 130 abuts against an edge of one side of the pole welding plate 200 close to the bare aluminum sheet 300.

[0039] In this embodiment, a second pressing edge 130 is provided on the side of the pole 100, the second pressing edge 130 is parallel to the top surface of the battery, and the second pressing edge 130 is closer to the pole welding plate 200 than the first pressing edge 110, and the second pressing edge 130 abuts against the second surface of the pole welding plate 200, thereby increasing the contact area between the pole 100 and the pole welding plate 200 and improving the stability of the connection between the pole 100 and the pole welding plate 200.

[0040] like Figure 2 As shown, in one embodiment, the projected length of the first pressing edge 110 on the pole welding plate 200 is smaller than the width of the sealing ring 400 .

[0041] In this embodiment, the projection length of the first pressing edge 110 on the pole welding plate 200 is smaller than the width of the sealing ring 400, and the first surface of the sealing ring 400 abuts against the pole welding plate 200, and when one side of the second surface of the sealing ring 400 abuts against the pole 100, the other side of the second surface of the sealing ring 400 can be tightly pressed against the bare aluminum sheet 300. The sealing ring 400 can close the gap between the bare aluminum sheet 300 and the pole 100, and prevent the electrolyte from flowing into the gap between the bare aluminum sheet 300 and the pole 100.

[0042] like Figure 2 and Figure 3 As shown, in one embodiment, an abutting edge portion 120 is provided on the pole 100 , the plane where the abutting edge portion 120 is located intersects with the aluminum sheet 300 , and the side surface of the sealing ring 400 abuts against the abutting edge portion 120 .

[0043] In this embodiment, the abutting edge 120 is disposed on the side of the pole 100, the first side of the abutting edge 120 is connected to the first pressing edge, and the second side of the abutting edge 120 is connected to the second pressing edge. The side of the sealing ring 400 is tightly pressed against the abutting edge 120, so that the sealing ring 400 closes the gap between the pole 100 and the pole welding plate 200, and the gap between the bare aluminum sheet 300 and the pole 100. In the case of a cold weld or a desoldering between the pole 100 and the pole welding plate 200, the sealing ring 400 can prevent the electrolyte from flowing out through the gap between the bare aluminum sheet 300 and the pole 100.

[0044] like Figure 2 and Figure 3As shown, in one embodiment, a snap-in notch 140 is provided at the bottom edge of the pole 100 , and the snap-in notch 140 is recessed relative to the bottom surface of the pole 100 toward the direction of the pole 100 away from the top surface of the battery.

[0045] In this embodiment, a snap-fit ​​notch 140 is provided at the bottom edge of the pole 100, and the snap-fit ​​notch 140 is recessed relative to the bottom surface of the pole 100. When the pole 100 is mounted on the top surface of the battery, the pole 100 is connected to the top surface of the battery through the snap-fit ​​notch 140. Adding the snap-fit ​​notch 140 facilitates the positioning between the pole 100 and the battery.

[0046] like Figure 2 and Figure 3 As shown, in one embodiment, it further includes an upper plastic ring 500, the upper plastic ring 500 is used to surround the side of the pole 100, and the upper plastic ring 500 is provided with an extended edge portion 510;

[0047] The pole 100 is provided with a third pressing edge 150, and the third pressing edge 150 is farther away from the top surface of the battery than the first pressing edge 110;

[0048] The extended edge portion 510 is arranged between the third pressing edge portion 150 and the bare aluminum sheet 300, the first surface of the extended edge portion 510 is used to face away from the bare aluminum sheet 300, the second surface of the extended edge portion 510 is parallel to the bare aluminum sheet 300, the first surface of the extended edge portion 510 abuts against the third pressing edge portion 150, and the second surface of the extended edge portion 510 abuts against the bare aluminum sheet 300.

[0049] In this embodiment, the pole 100 is provided with a third pressing edge 150, the third pressing edge 150 is parallel to the first pressing edge 110, and the third pressing edge 150 is away from the sealing ring 400 relative to the first pressing edge 110. The upper plastic ring 500 surrounds the side of the pole 100, and the upper plastic ring 500 is provided with an extension edge 510, and the extension edge 510 faces the pole 100. The first surface of the extension edge 510 abuts against the third pressing edge 150, and the second surface of the extension edge 510 abuts against the bare aluminum sheet 300, so that the bare aluminum sheet 300 is isolated from the pole 100.

[0050] like Figure 2 and Figure 3 As shown, in one embodiment, a blocking edge 310 is protrudingly provided on a side of the bare aluminum sheet 300 facing away from the sealing ring 400, and a limiting edge 520 is provided on a side of the upper plastic ring 500 facing away from the pole 100. The limiting edge 520 is recessed in the side of the upper plastic ring 500 facing away from the pole 100, and the blocking edge 310 abuts against the limiting edge 520.

[0051] In this embodiment, a blocking edge 310 is provided on the side of the bare aluminum sheet 300 facing away from the sealing ring 400, and the blocking edge 310 is raised from the surface of the bare aluminum sheet 300. A limiting edge 520 is provided on the side of the upper plastic ring 500 facing away from the pole 100. When the upper plastic ring 500 abuts against the bare aluminum sheet 300, the blocking edge 310 abuts against the limiting edge 520, and the blocking edge 310 is used to limit the movement of the upper plastic ring 500, so that the upper plastic ring 500 can be stably connected to the pole 100. At the same time, the blocking edge 310 can also enable the upper plastic ring 500 to be more accurately installed on the peripheral side of the pole 100.

[0052] like Figure 2 and Figure 3 As shown, in one embodiment, a side of the upper plastic ring 500 facing the pole 100 is protruded with a bearing edge 530 , and a side of the bearing edge 530 facing away from the bare aluminum sheet 300 is used to abut against the edge of the pole 100 .

[0053] In this embodiment, the bearing edge 530 protrudes from the side of the upper plastic ring 500 facing the pole 100. When the upper plastic ring 500 is installed on the side of the pole 100, the bearing edge 530 is a stepped surface, and the first surface of the bearing edge 530 abuts against the side of the pole 100 facing the top surface of the battery, and the second surface of the bearing edge 530 abuts against the side of the pole 100. The bearing edge 530 is used to increase the contact area between the upper plastic ring 500 and the pole 100, so that the upper plastic ring 500 can be fixed on the side of the pole 100 more stably.

[0054] like Figure 2 and Figure 3 As shown, in one embodiment, it also includes a lower plastic ring 600, which is arranged between the bare aluminum sheet 300 and the top surface of the battery, and a plastic ring edge 610 is provided on the side of the lower plastic ring 600 facing the pole 100, and a first surface of the plastic ring edge 610 abuts against a surface of the bare aluminum sheet 300 facing the sealing ring 400, and a second surface of the plastic ring edge 610 abuts against a surface of the pole welding plate 200 facing the bare aluminum sheet 300.

[0055] In this embodiment, a lower plastic ring 600 is provided between the bare aluminum sheet 300 and the top surface of the battery, and the lower plastic ring 600 is used to separate the bare aluminum sheet 300 from the top surface of the battery. A plastic ring edge 610 is provided on the lower plastic ring 600, and the first surface of the plastic ring edge 610 and the second surface of the plastic ring edge 610 are arranged opposite to each other, and the first surface of the plastic ring edge 610 abuts against the second surface of the pole welding plate 200, and the second surface of the plastic ring edge 610 abuts against the side of the bare aluminum sheet 300 facing the top surface of the battery. The plastic ring edge 610 is used to separate the bare aluminum sheet 300 from the pole welding plate 200 to prevent the bare aluminum sheet 300 from contacting the pole welding plate 200.

[0056] Embodiment 2

[0057] In one embodiment, a battery is provided, comprising a battery body and the top cover described in any of the above embodiments, wherein the lower plastic ring 600 is arranged on the top of the battery body, the bare aluminum sheet 300 is arranged on the side of the lower plastic ring 600 facing away from the battery body, the upper plastic ring 500 surrounds the outside of the positive electrode column 100 and the negative electrode and abuts against the positive electrode column 100 and the negative electrode column 100, and an extended edge is arranged at one end edge of the positive electrode column 100 and the negative electrode column 100 away from the top of the battery, and the extended edge abuts against the bearing edge 530, and a negative electrode column is arranged in the top cover, and the negative electrode column includes a copper-aluminum composite layer formed by tightly connecting a metal copper layer 101 and a metal aluminum layer 102.

[0058] In this embodiment, the shape of the positive electrode column 100 is the same as that of the negative electrode column 100. The negative electrode column 100 adopts a copper-aluminum composite layer 120 structure to replace the traditional friction welding electrode column, wherein the metal copper layer 101 is arranged between the metal aluminum layer 102 and the battery body. The material utilization rate of the copper-aluminum composite layer electrode column is much higher than that of the friction welding electrode column, which reduces the cost of the top cover. In addition, the copper-aluminum composite layer electrode column can be directly stamped by a mold, while the friction welding electrode column needs to be friction welded, which reduces the processing steps and thus reduces the cost of the top cover.

[0059] Embodiment 3

[0060] In one embodiment, an electronic device is provided, comprising: the battery described in any one of the above embodiments.

[0061] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A top cover, characterized in that: include: A pole, a pole welding plate, a bare aluminum sheet and a sealing ring, wherein the bare aluminum sheet, the sealing ring and the pole welding plate are arranged in sequence; The plain aluminum sheet is provided with a pole hole; The pole welding plate is at least partially projected onto the bare aluminum sheet; The pole is inserted into the pole hole and welded to the pole welding plate; The pole is provided with a first pressing edge, the first pressing edge faces the pole welding plate, and the first pressing edge is at least partially projected onto the pole welding plate; The sealing ring has a side away from the bare aluminum sheet butted against the pole welding plate, and two ends of a side of the sealing ring close to the bare aluminum sheet butted against the bare aluminum sheet and the first pressing edge portion respectively.

2. The top cover according to claim 1, characterized in that: A second pressing edge is also provided on the side of the pole, the second pressing edge is closer to the pole welding plate than the first pressing edge, and the second pressing edge abuts against an edge of the pole welding plate close to the bare aluminum sheet.

3. The top cover according to claim 1, characterized in that: The projected length of the first pressing edge on the pole welding plate is smaller than the width of the sealing ring.

4. The top cover according to claim 1, characterized in that: The pole is provided with an abutting edge portion, the plane where the abutting edge portion is located intersects with the plain aluminum sheet, and the side surface of the sealing ring abuts against the abutting edge portion.

5. The top cover according to claim 1, characterized in that: It also includes an upper plastic ring, which is used to surround the side of the pole, and the upper plastic ring is provided with an extended edge portion; The pole is provided with a third pressing edge, and the third pressing edge is farther away from the sealing ring than the first pressing edge; The extended edge is arranged between the third pressing edge and the plain aluminum sheet, the first surface of the extended edge is used to face away from the plain aluminum sheet, the second surface of the extended edge is parallel to the plain aluminum sheet, the first surface of the extended edge abuts against the third pressing edge, and the second surface of the extended edge abuts against the plain aluminum sheet.

6. The top cover according to claim 5, characterized in that: A blocking edge is protruding from one side of the bare aluminum sheet facing away from the sealing ring, a limiting edge is provided on one side of the upper plastic ring facing away from the pole, the limiting edge is recessed in the side of the upper plastic ring facing away from the pole, and the blocking edge abuts against the limiting edge.

7. The top cover according to claim 5, characterized in that: A bearing edge is protruding from one side of the upper plastic ring facing the pole, and a side of the bearing edge facing away from the plain aluminum sheet is used to abut against the edge of the pole.

8. The top cover according to claim 1, characterized in that: It also includes a lower plastic ring, which is arranged between the bare aluminum sheet and the top surface of the battery. A plastic ring edge is arranged on the side of the lower plastic ring facing the pole. The first surface of the plastic ring edge abuts against the side of the bare aluminum sheet facing the sealing ring, and the second surface of the plastic ring edge abuts against the side of the pole welding plate facing the bare aluminum sheet.

9. A battery, characterized in that: It comprises a battery body and a top cover according to any one of claims 1 to 8, wherein the lower plastic ring is arranged on the top of the battery body, the bare aluminum sheet is arranged on the side of the lower plastic ring facing away from the battery body, the upper plastic ring surrounds the outside of the positive electrode column and the negative electrode and abuts against the positive electrode column and the negative electrode column, an extended edge is arranged on the edge of one end of the positive electrode column and the negative electrode column away from the top of the battery, the extended edge abuts against the bearing edge, a negative electrode column is arranged in the top cover, and the negative electrode column comprises a copper-aluminum composite layer formed by tightly connecting a metal copper layer and a metal aluminum layer.

10. An electronic device, characterized in that: Comprising the battery as claimed in claim 9.

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