Cover plate assembly and battery

Abstract

The utility model relates to the field of battery structures, in particular to a cover plate assembly and a battery. The cover plate assembly comprises a top cover sheet and a current collector; the current collector comprises a current collecting disc and a connecting cylinder, the current collecting disc is provided with a communicating hole, one end of the connecting cylinder is arranged at the communicating hole, and a cavity of the connecting cylinder is communicated with the communicating hole; a liquid injection hole is formed in the top cover piece, the other end of the connecting cylinder penetrates through the liquid injection hole from one side of the top cover piece, and a turned-over edge attached to the edge of the liquid injection hole is formed in the position, on the other side of the top cover piece, of the connecting cylinder. According to the cover plate assembly provided by the invention, the connecting cylinder is arranged at the communicating hole of the collector plate, the connecting cylinder can form the flange on the outer side of the top cover plate, and the top cover plate and the collector plate can be tightly welded by pressing the flange, so that reliable welding of the top cover plate and the collector plate is ensured, and roll core damage caused by extrusion of the roll core is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery structures, and in particular to a cover plate assembly and a battery. Background Art

[0002] The cover of a cylindrical battery consists of a current collector, an aluminum shell base, and terminals. The terminals are welded to the outside of the shell base. The current collector is located on the inside of the shell base and is welded to it via penetration welding. During welding, the core is squeezed from one side and the aluminum shell from the other to ensure a tight fit between the current collector and the shell base, ensuring a reliable weld. However, squeezing can easily damage the core, compressing it and affecting product quality. Utility Model Content

[0003] The purpose of this application is to provide a cover plate assembly and a battery, which can make the current collector fit tightly with the shell bottom, thereby ensuring reliable welding and avoiding squeezing the core and causing damage to the core.

[0004] The present application provides a cover plate assembly, comprising a top cover sheet and a current collector;

[0005] The current collector includes a current collecting plate and a connecting tube. The current collecting plate is provided with a communicating hole. One end of the connecting tube is provided at the communicating hole, and the cavity of the connecting tube is communicated with the communicating hole.

[0006] The top cover sheet is provided with a liquid injection hole, the other end of the connecting tube passes through the liquid injection hole from one side of the top cover sheet, and the connecting tube forms a flange on the other side of the top cover sheet that fits the edge of the liquid injection hole.

[0007] In the above technical solution, further, the flange includes at least three folding segments, and the plurality of folding segments radially cover the edge of the liquid injection hole.

[0008] In the above technical solution, further, the communicating hole is located at the center of the collecting plate.

[0009] In the above technical solution, further, the liquid injection hole is located at the center of the top cover piece.

[0010] In the above technical solution, further, the collecting plate includes a flat surface portion and a convex surface portion;

[0011] The flat portion is arranged around the circumference of the convex portion, and the convex surface of the convex portion is in contact with the top cover sheet;

[0012] An accommodating space is formed between the planar portion and the top cover sheet.

[0013] In the above technical solution, further, the planar portion is provided with a plurality of flow holes, and the plurality of flow holes are arranged at intervals on a preset circumference.

[0014] In the above technical solution, further, the circulation hole is an arc-shaped hole, and the arc line corresponding to the arc-shaped hole is located on the preset circumference.

[0015] In the above technical solution, further comprising a terminal;

[0016] The terminal includes a boss portion and an embedded portion, wherein the boss portion is connected to the embedded portion;

[0017] On the side of the top cover sheet away from the collecting plate, a sink is provided around the injection hole, the embedded portion is embedded in the sink, and the boss is located on the side of the embedded portion away from the top cover sheet.

[0018] In the above technical solution, further, it also includes an explosion-proof valve;

[0019] The explosion-proof valve includes a protective sheet and an explosion-proof sheet; the top cover sheet is provided with a mounting hole, the protective sheet is connected to the side of the mounting hole away from the current collecting plate, and the explosion-proof sheet is connected to the side of the mounting hole facing the current collecting plate.

[0020] The present application also provides a battery, comprising the cover assembly described in the above solution.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The cover plate assembly provided in the present application is configured by providing a connecting tube at the connecting hole of the collecting disk, and the connecting tube can form a flange on the outer side of the top cover piece. By pressing the flange, the top cover piece and the collecting disk can be welded tightly, thereby ensuring that the welding of the top cover piece and the collecting disk is reliable and avoiding squeezing the winding core and causing damage to the winding core.

[0023] The present application also provides a battery, including the cover assembly described in the above solution. Based on the above analysis, it can be seen that the battery also has the above beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the first structure of the cover assembly provided in this application;

[0026] Figure 2This is a second structural schematic diagram of the cover assembly provided in this application.

[0027] In the figure: 101-top cover plate; 102-current collector; 103-current collecting plate; 104-connecting tube; 105-liquid injection hole; 106-flange; 107-incision; 108-flat portion; 109-convex portion; 110-accommodating space; 111-circulation hole; 112-terminal; 113-boss portion; 114-embedded portion; 115-sunk platform; 116-explosion-proof valve; 117-protective plate; 118-explosion-proof plate; 119-mounting hole. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0029] 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.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "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 the specific circumstances.

[0031] Example 1

[0032] See also Figure 1 and Figure 2 As shown, the cover plate assembly provided in this application can be applied to cylindrical batteries.

[0033] Specifically, the cover plate assembly includes a top cover sheet 101 and a current collector 102. The current collector 102 includes a current collecting disc 103 and a connecting tube 104. The current collecting disc 103 is provided with a communication hole. One end of the connecting tube 104 is disposed at the communication hole, and the cavity of the connecting tube 104 is connected to the communication hole. In other words, the provision of the connecting tube 104 does not affect the circulation of the electrolyte, and the electrolyte can flow through the cavity of the connecting tube 104 and the communication hole.

[0034] Furthermore, the top cover sheet 101 is provided with an injection hole 105. The other end of the connecting tube 104 extends through the injection hole 105 from one side of the top cover sheet 101. The connecting tube 104 also forms a flange 106 on the other side of the top cover sheet 101 that aligns with the edge of the injection hole 105. At the injection hole 105, the electrolyte can flow through the cavity of the connecting tube 104 and the connecting hole and enter the interior of the battery.

[0035] Specifically, before welding the top cover sheet 101 to the current collector 102, the current collecting plate 103 is first placed on the inner side of the top cover sheet 101. Since the diameter of the injection hole 105 is slightly larger than the outer diameter of the connecting tube 104, the connecting tube 104 can pass through the injection hole 105 from the inner side of the top cover sheet 101, making it easier to assemble the two. The length of the connecting tube 104 is larger than the thickness of the top cover sheet 101, so that the end of the connecting tube 104 can protrude from the outer surface of the top cover sheet 101. On the outer side of the top cover sheet 101, pressure can be applied to the end of the connecting tube 104 to form a flange 106 pressed against the edge of the injection hole 105. When welding the top cover sheet 101 and the current collector 102, pressing the flange 106 can make the top cover sheet 101 and the current collecting plate 103 close together, and the flange 106 is welded by penetration welding to ensure flow.

[0036] The cover plate assembly provided in the present application is provided with a connecting tube 104 at the connecting hole of the collecting plate 103, and the connecting tube 104 can form a flange 106 on the outer side of the top cover piece 101. By pressing the flange 106, the top cover piece 101 and the collecting plate 103 can be welded tightly, thereby ensuring that the top cover piece 101 and the collecting plate 103 are welded reliably and avoiding squeezing the winding core and causing damage to the winding core.

[0037] In an optional solution of this embodiment, the flange 106 includes at least three folded segments, and the multiple folded segments radially cover the edge of the liquid injection hole 105.

[0038] In this embodiment, the pressing process of the flange 106 is as follows: First, a plurality of cuts 107 are opened at the end of the connecting tube 104 away from the collecting plate 103. The plurality of cuts 107 can divide the end of the connecting tube 104 into a plurality of arc segments. Preferably, the plurality of cuts 107 can evenly divide the end of the connecting tube 104 into equal arc segments. Then, the end of the connecting tube 104 is passed through the injection hole 105 of the top cover sheet 101 so that the plurality of arc segments protrude from the outside of the top cover sheet 101. Finally, the plurality of arc segments are pressed in each direction of the edge of the injection hole 105 to form a plurality of corresponding folded segments, and the plurality of folded segments radially cover the edge of the injection hole 105.

[0039] Furthermore, there are at least three folded segments. Accordingly, there are at least three notches 107 formed at the end of the connecting tube 104, and at least three arcuate segments formed by the segmentation. This arrangement minimizes the curvature of each arcuate segment. When pressure is applied to the arcuate segment, it is easier for the arcuate segment to fold over and adhere to the circumferential edge of the injection hole 105, ensuring that the material is less likely to crack after folding.

[0040] In the optional solution of this embodiment, Figure 1 As shown, the collecting disc 103 is disc-shaped, and the communicating hole is located at the center of the collecting disc 103 , that is, the connecting tube 104 is also provided at the center of the collecting disc 103 .

[0041] Optionally, the top cover piece 101 is also disc-shaped, and the liquid injection hole 105 is located at the center of the top cover piece 101. That is, the collecting plate 103 and the top cover piece 101 are coaxially arranged.

[0042] In an optional solution of this embodiment, the collecting plate 103 includes a planar portion 108 and a convex portion 109. The planar portion 108 is arranged circumferentially around the convex portion 109, and the protruding surface of the convex portion 109 is in contact with the top cover sheet 101 and can be welded to the top cover sheet 101. The side of the planar portion 108 facing away from the top cover sheet 101 is welded to the winding core. The side of the planar portion 108 facing the top cover sheet 101 forms a storage space 110 between the top cover sheet 101 and the top cover sheet 101. This storage space 110 can store electrolyte and can also serve as a gas chamber to store side reaction gases.

[0043] In an optional solution of this embodiment, the planar portion 108 is provided with a plurality of flow holes 111 , and the plurality of flow holes 111 are arranged at intervals on a preset circumference.

[0044] Optionally, the circulation hole 111 is an arc-shaped hole, and the arc line corresponding to the arc-shaped hole is located on a preset circumference.

[0045] In this embodiment, Figure 1As shown, eight arc-shaped holes are shown. Four of these are smaller and distributed along a first circumference with a smaller radius, while the remaining four are larger and distributed along a second circumference with a larger radius. Multiple flow holes 111 are provided on the collecting plate 103 to ensure that the electrolyte in the storage space 110 can more smoothly penetrate the core through the flow holes 111. Furthermore, exhaust gas from the core can flow more effectively into the storage space 110 through the flow holes 111.

[0046] Example 2

[0047] The cover plate assembly in this second embodiment is an improvement on the above embodiment. The technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in this second embodiment.

[0048] In an optional solution of this embodiment, the cover plate assembly also includes a terminal 112, which is used for electrode output. The terminal 112 includes a boss portion 113 and an embedded portion 114, the boss portion 113 is connected to the embedded portion 114, and the boss portion 113 is located on the side of the embedded portion 114 away from the top cover plate 101. The boss portion 113 is located at the center of the embedded portion 114, and the proportion of the projected area of ​​the boss portion 113 on the embedded portion 114 is between 10% and 70%. The boss portion 113 can be specifically set to a cylindrical structure of a circular, square or other shape, and the thickness of the boss portion 113 is between 1mm and 3mm. The thickness of the embedded portion 114 is between 0.5mm and 1.5mm, and the circumferential edge of the embedded portion 114 is 1mm to 3mm wider than the circumferential edge of the boss portion 113.

[0049] Furthermore, on the side of the top cover 101 away from the collecting plate 103, a sink 115 is provided in the circumference of the liquid injection hole 105, and the embedded portion 114 is embedded and installed in the sink 115. Figure 2 As shown, the height of the recessed platform 115 is equal to the thickness of the embedded portion 114, ensuring that the embedded portion 114 is completely embedded within the recessed platform 115, thereby ensuring reliable welding. Furthermore, a first bevel is provided on the edge of the embedded portion 114 facing the top cover sheet 101, and a second bevel is provided on the circumferential edge of the recessed platform 115, with the first bevel overlapping the second bevel. Laser welding is used to secure the terminal 112 and ensure flow through it, while also sealing the injection hole 105.

[0050] In an optional solution of this embodiment, the cover assembly also includes an explosion-proof valve 116, which includes a protective sheet 117 and an explosion-proof disc 118. The top cover 101 is provided with a mounting hole 119. The protective sheet 117 can be glued to the side of the mounting hole 119 facing away from the collecting tray 103. The explosion-proof disc 118 is welded to the side of the mounting hole 119 facing the collecting tray 103 to provide explosion-proof pressure relief. Optionally, the area of ​​the explosion-proof valve 116 occupies between 5% and 20% of the area of ​​the top cover 101 to ensure smooth pressure relief.

[0051] In addition, an accommodating space 110 is formed between the flat surface portion 108 of the current collecting tray 103 and the top cover sheet 101 , so that the current collecting tray 103 does not interfere with the explosion-proof valve 116 and does not affect the pressure relief function of the explosion-proof valve 116 .

[0052] Example 3

[0053] Embodiment 3 of the present application provides a battery, including the cover assembly of any of the above embodiments, and thus has all the beneficial technical effects of the cover assembly of any of the above embodiments, which will not be repeated here.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. In addition, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that they are within the scope of the present application and form different embodiments.

Claims

1. A cover plate assembly, characterized in that: including a top cover sheet and a current collector; The current collector includes a current collecting plate and a connecting tube. The current collecting plate is provided with a communicating hole. One end of the connecting tube is provided at the communicating hole, and the cavity of the connecting tube is communicated with the communicating hole. The top cover sheet is provided with a liquid injection hole, the other end of the connecting tube passes through the liquid injection hole from one side of the top cover sheet, and the connecting tube forms a flange on the other side of the top cover sheet that fits the edge of the liquid injection hole.

2. The cover plate assembly according to claim 1, wherein: The flange includes at least three folding sections, and a plurality of the folding sections radially cover the edge of the liquid injection hole.

3. The cover plate assembly according to claim 1, wherein: The communication hole is located at the center of the current collecting plate.

4. The cover plate assembly according to claim 1, wherein: The liquid injection hole is located at the center of the top cover piece.

5. The cover plate assembly according to claim 1, wherein: The collecting plate includes a flat surface and a convex surface; The flat portion is arranged around the circumference of the convex portion, and the convex surface of the convex portion is in contact with the top cover sheet; An accommodating space is formed between the planar portion and the top cover sheet.

6. The cover plate assembly according to claim 5, wherein: The planar portion is provided with a plurality of flow holes, and the plurality of flow holes are arranged at intervals on a preset circumference.

7. The cover plate assembly according to claim 6, wherein: The flow hole is an arc-shaped hole, and the arc line corresponding to the arc-shaped hole is located on the preset circumference.

8. The cover plate assembly according to claim 1, wherein: Also includes terminals; The terminal includes a boss portion and an embedded portion, wherein the boss portion is connected to the embedded portion; On the side of the top cover sheet away from the collecting plate, a sink is provided around the injection hole, the embedded portion is embedded in the sink, and the boss is located on the side of the embedded portion away from the top cover sheet.

9. The cover plate assembly according to claim 1, wherein: Also includes explosion-proof valves; The explosion-proof valve includes a protective sheet and an explosion-proof sheet; the top cover sheet is provided with a mounting hole, the protective sheet is connected to the side of the mounting hole away from the current collecting plate, and the explosion-proof sheet is connected to the side of the mounting hole facing the current collecting plate.

10. A battery, characterized in that: The invention comprises the cover plate assembly according to any one of claims 1 to 9.

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