Cover plate assembly and square battery for preventing electrolyte residue

Abstract

The utility model provides a cover plate assembly and a square battery for preventing electrolyte residue. The cover plate assembly for preventing electrolyte residue includes a cover plate and a sealing nail. The cover plate is provided with a liquid injection hole, and the side wall of the liquid injection hole includes a first guide surface, a straight surface and a second guide surface. The straight surface is perpendicular to the central axis of the liquid injection hole, and the first guide surface and the second guide surface are both inclined to the central axis of the liquid injection hole. The angle between the second guide surface and the central axis of the liquid injection hole is greater than the angle between the first guide surface and the central axis of the liquid injection hole. The straight surface and the first guide surface, and the second guide surface and the straight surface are smoothly transitioned through an arc surface. The sealing nail includes a nail cap and a nail column, the periphery of the nail cap is connected to the straight surface, and the nail column is penetrated in the inner cavity of the first guide surface. The square battery includes the above-mentioned cover plate assembly for preventing electrolyte residue. The cover plate assembly and the square battery for preventing electrolyte residue of the utility model can make the electrolyte flow smoothly in the liquid injection hole and facilitate the placement of the sealing nail.

Description

Technical Field

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

[0002] With the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, etc., which provides a broad space for the application and development of lithium batteries. Among them, the lithium batteries used in power tools and electric vehicles are generally called square batteries.

[0003] A square battery generally includes a cover plate assembly and a shell, and the cover plate assembly is connected to the open end of the shell. The cover plate assembly includes a cover plate and a sealing pin. The cover plate is provided with an injection hole for injecting electrolyte, and the sealing pin is welded in the injection hole to seal the injection hole. The cover plate is provided with an injection hole, and the side wall of the injection hole includes an inclined surface, a straight surface and a cylindrical surface arranged in sequence from top to bottom. The inclined surface is inclined to the central axis of the injection hole, the straight surface is perpendicular to the central axis of the injection hole, and the cylindrical surface is parallel to the central axis of the injection hole. Among them, the inclined surface, the straight surface and the cylindrical surface are directly connected, and the connection is not smooth. It is easy for liquid to remain at the connection during injection, resulting in the electrolyte flow not being smooth enough.

[0004] Therefore, it is necessary to provide a cover plate assembly and a square battery that can prevent electrolyte residue to solve the above technical problems. Utility Model Content

[0005] The utility model provides a cover plate assembly and a square battery for preventing electrolyte residue, which can make the electrolyte flow smoothly in the injection hole and facilitate the placement of sealing nails.

[0006] The technical solution of the utility model is:

[0007] A cover plate assembly for preventing electrolyte residue, comprising:

[0008] A cover plate, which is provided with a liquid injection hole, wherein the side wall of the liquid injection hole comprises a first guide surface, a straight surface, and a second guide surface arranged in sequence along the axial direction thereof, wherein the first guide surface is closer to the bottom surface of the cover plate relative to the straight surface, the straight surface is perpendicular to the central axis of the liquid injection hole, the first guide surface and the second guide surface are both inclined to the central axis of the liquid injection hole, the apertures of the first guide surface and the second guide surface gradually increase from the bottom surface of the cover plate to the top surface of the cover plate, the angle between the second guide surface and the central axis of the liquid injection hole is greater than the angle between the first guide surface and the central axis of the liquid injection hole; the straight surface and the first guide surface, and the second guide surface and the straight surface are both smoothly transitioned through arc surfaces; and,

[0009] The sealing nail comprises a nail cap and a nail column, wherein the periphery of the nail cap is connected to the straight surface, the nail column is connected to the center of the bottom surface of the nail cap, and the nail column is penetrated into the inner cavity of the first guide surface.

[0010] In the cover plate assembly for preventing electrolyte residue described in the utility model, the side wall of the injection hole also includes a cylindrical surface, the cylindrical surface is connected to the first guide surface, the cylindrical surface is close to the bottom surface of the cover plate relative to the first guide surface, the cylindrical surface is parallel to the central axis of the injection hole, and the nail column is penetrated by the cylindrical surface; the sealing nail also includes a hose, which is sleeved on the nail column, and the hose is clamped between the cylindrical surface and the nail column.

[0011] In the cover plate assembly for preventing electrolyte residue described in the utility model, a trumpet-shaped expansion portion is provided at the end of the hose away from the nail cap, and the outer diameter of the expansion portion gradually increases from the end close to the nail cap to the end away from the nail cap, and the maximum outer diameter of the expansion portion is smaller than the maximum aperture of the first guide surface.

[0012] In the cover plate assembly for preventing electrolyte residue of the utility model, the rubber hose is fixed to the nail column, and the expansion part abuts against the bottom edge of the column surface.

[0013] In the cover plate assembly for preventing electrolyte residue described in the utility model, a boss is arranged on the bottom surface of the cover plate, and the first guide surface and the columnar surface are both arranged on the boss.

[0014] In the cover plate assembly for preventing electrolyte residue described in the utility model, the side wall of the injection hole also includes a third guide surface, the third guide surface is connected to the second guide surface, the third guide surface is close to the top surface of the cover plate relative to the second guide surface, the third guide surface is inclined to the central axis of the injection hole, the aperture of the third guide surface gradually increases from the bottom surface of the cover plate to the top surface of the cover plate, and the angle between the third guide surface and the central axis of the injection hole is greater than the angle between the second guide surface and the central axis of the injection hole.

[0015] In the cover plate assembly for preventing electrolyte residue of the utility model, the connection between the third guide surface and the second guide surface is smoothly transitioned through an arc surface.

[0016] In the cover plate assembly for preventing electrolyte residue of the utility model, the cover plate and the sealing nail are both made of metal, and the edge of the nail cap is welded to the cover plate.

[0017] In the cover plate assembly for preventing electrolyte residue of the utility model, the top surface of the nail cap is lower than the top end of the second guide surface.

[0018] Another technical solution of the utility model is:

[0019] A square battery, comprising:

[0020] The above-mentioned cover plate assembly for preventing electrolyte residue; and

[0021] The cover is connected to the opening of the shell.

[0022] Compared with the prior art, the utility model has the following beneficial effects: the cover plate assembly and square battery for preventing electrolyte residue of the utility model can make the electrolyte residue on the cover plate flow into the injection hole through the second guide surface, the straight surface can limit the nail cap, and the bottom end of the first guide surface can limit the nail column. The straight surface and the first guide surface, and the second guide surface and the straight surface are smoothly transitioned through the arc surface, which can make the electrolyte flow smoothly at the connection between the straight surface and the first guide surface, and at the connection between the second guide surface and the straight surface. The first guide surface is inclined, so that the electrolyte can easily flow from the straight surface to the first guide surface. The aperture of the first guide surface has a large opening at the upper end and a small opening at the lower end, which is also convenient for the nail column to penetrate into the hole surrounded by the first guide surface. The cover plate assembly and square battery for preventing electrolyte residue of the utility model can make the electrolyte flow smoothly in the injection hole and facilitate the placement of sealing nails. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0024] Figure 1 A schematic diagram of the exploded cross-sectional structure of a cover plate assembly for preventing electrolyte residue provided in a preferred embodiment of the utility model.

[0025] Figure 2 A schematic cross-sectional structure diagram of a cover plate assembly for preventing electrolyte residue provided in a preferred embodiment of the utility model.

[0026] in,

[0027] 11. Cover plate,

[0028] 111, liquid injection hole, 1111, first guide surface, 1112, straight surface, 1113, second guide surface, 1114, cylindrical surface, 1115, third guide surface,

[0029] 112. Boss,

[0030] 12. Sealing nail, 121. Nail cap, 122. Nail column, 123. Hose, 1231. Expansion part.

[0031] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0033] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used for reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0034] The words "first", "second" and the like in the terminology of the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be construed as limiting the order of precedence.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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, it can be the internal connection of two elements or the interaction relationship between two elements. 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] A square battery generally includes a cover plate assembly and a shell, and the cover plate assembly is connected to the open end of the shell. The cover plate assembly includes a cover plate and a sealing pin. The cover plate is provided with an injection hole for injecting electrolyte, and the sealing pin is welded in the injection hole to seal the injection hole. The cover plate is provided with an injection hole, and the side wall of the injection hole includes an inclined surface, a straight surface and a cylindrical surface arranged in sequence from top to bottom. The inclined surface is inclined to the central axis of the injection hole, the straight surface is perpendicular to the central axis of the injection hole, and the cylindrical surface is parallel to the central axis of the injection hole. Among them, the inclined surface, the straight surface and the cylindrical surface are directly connected, and the connection is not smooth. It is easy for liquid to remain at the connection during injection, resulting in the electrolyte flow not being smooth enough.

[0037] The following is a preferred embodiment of a square battery provided by the present invention that can solve the above technical problems.

[0038] Please refer to Figure 1 and Figure 2, a preferred embodiment of the utility model provides a square battery, which includes a cover plate assembly and a shell for preventing electrolyte residue. The cover plate assembly for preventing electrolyte residue includes a cover plate 11 and a sealing nail 12. The cover plate 11 is provided with a liquid injection hole 111, and the side wall of the liquid injection hole 111 includes a first guide surface 1111, a straight surface 1112 and a second guide surface 1113 arranged in sequence along its axial direction. The first guide surface 1111 is close to the bottom surface of the cover plate 11 relative to the straight surface 1112, and the straight surface 1112 is perpendicular to the central axis of the liquid injection hole 111, and the first guide surface 1111 and the second guide surface 1113 are both inclined to the central axis of the liquid injection hole 111. The apertures of the first guide surface 1111 and the second guide surface 1113 gradually increase from the bottom surface of the cover plate 11 to the top surface of the cover plate 11, and the angle between the second guide surface 1113 and the central axis of the injection hole 111 is greater than the angle between the first guide surface 1111 and the central axis of the injection hole 111. The straight surface 1112 and the first guide surface 1111, and the second guide surface 1113 and the straight surface 1112 are smoothly transitioned through arc surfaces. The sealing nail 12 includes a nail cap 121 and a nail column 122, the periphery of the nail cap 121 is connected to the straight surface 1112, the nail column 122 is connected to the bottom center of the nail cap 121, and the nail column 122 is penetrated in the inner cavity of the first guide surface 1111. The cover plate 11 is connected to the opening of the shell.

[0039] The cover plate assembly and square battery for preventing electrolyte residue of the utility model can make the electrolyte residue on the cover plate 11 flow into the injection hole 111 through the second guide surface 1113, the straight surface 1112 can limit the nail cap 121, and the bottom end of the first guide surface 1111 can limit the nail column 122. The straight surface 1112 and the first guide surface 1111, and the second guide surface 1113 and the straight surface 1112 are smoothly transitioned through the arc surface, so that the electrolyte can flow smoothly at the connection between the straight surface 1112 and the first guide surface 1111, and at the connection between the second guide surface 1113 and the straight surface 1112. The first guide surface 1111 is inclined, so that the electrolyte can easily flow from the straight surface 1112 to the first guide surface 1111. The aperture of the first guide surface 1111 is large at the upper end and small at the lower end, which is also convenient for the nail column 122 to penetrate into the hole surrounded by the first guide surface 1111. The cover plate assembly and square battery for preventing electrolyte residue of the utility model can make the electrolyte flow smoothly in the injection hole 111 and facilitate the placement of the sealing nail 12.

[0040] The side wall of the injection hole 111 also includes a cylindrical surface 1114, which is connected to the first guide surface 1111. The cylindrical surface 1114 is close to the bottom surface of the cover plate 11 relative to the first guide surface 1111. The cylindrical surface 1114 is parallel to the central axis of the injection hole 111, and the nail column 122 is penetrated by the cylindrical surface 1114. The sealing nail 12 also includes a hose 123, which is sleeved on the nail column 122, and the hose 123 is clamped between the cylindrical surface 1114 and the nail column 122. With the above structure, the gap between the cylindrical surface 1114 and the nail column 122 can be filled by the hose 123 to improve the sealing performance.

[0041] The end of the rubber hose 123 away from the nail cap 121 is provided with a trumpet-shaped expansion part 1231, and the outer diameter of the expansion part 1231 gradually increases from the end close to the nail cap 121 to the end away from the nail cap 121, and the maximum outer diameter of the expansion part 1231 is smaller than the maximum aperture of the first guide surface 1111. With the above structure, when the nail column 122 is inserted into the hole surrounded by the column surface 1114, the electrolyte on the first guide surface 1111 can be scraped to the bottom by the expansion part 1231. The maximum outer diameter of the expansion part 1231 is smaller than the maximum aperture of the first guide surface 1111, which can ensure that the expansion part 1231 can smoothly enter the hole surrounded by the first guide surface 1111.

[0042] The hose 123 is fixed to the nail column 122, and the expansion part 1231 abuts against the bottom edge of the cylinder 1114. With the above structure, the bottom edge of the cylinder 1114 can limit the expansion part 1231 to prevent the hose 123 from moving upward, thereby preventing the sealing nail 12 from detaching from the injection hole 111 during assembly.

[0043] The bottom surface of the cover plate 11 is provided with a boss 112, and the first guide surface 1111 and the cylindrical surface 1114 are both provided on the boss 112. With the above structure, the boss 112 makes the cover plate 11 thicker locally, which is convenient for providing the first guide surface 1111 and the cylindrical surface 1114, and the other parts of the cover plate 11 are thinner, which can effectively reduce weight and save materials.

[0044] The side wall of the injection hole 111 also includes a third guide surface 1115, the third guide surface 1115 is connected to the second guide surface 1113, the third guide surface 1115 is closer to the top surface of the cover plate 11 relative to the second guide surface 1113, the third guide surface 1115 is inclined to the central axis of the injection hole 111, the aperture of the third guide surface 1115 gradually increases from the bottom surface of the cover plate 11 to the top surface of the cover plate 11, and the angle between the third guide surface 1115 and the central axis of the injection hole 111 is greater than the angle between the second guide surface 1113 and the central axis of the injection hole 111. With the above structure, the third guide surface 1115 is an inclined surface, which facilitates the residual electrolyte to flow into the injection hole 111. The angle between the third guide surface 1115 and the central axis of the injection hole 111 is greater than the angle between the second guide surface 1113 and the central axis of the injection hole 111, which can further expand the upper aperture of the injection hole 111 to collect more residual electrolyte.

[0045] The connection between the third guide surface 1115 and the second guide surface 1113 is smoothly transitioned through an arc surface. With this structure, the electrolyte can flow smoothly from the third guide surface 1115 to the second guide surface 1113.

[0046] The cover plate 11 and the sealing nail 12 are both made of metal, and the edge of the nail cap 121 is welded to the cover plate 11. With this structure, the connection between the cover plate 11 and the sealing nail 12 can be stabilized, thereby improving the sealing performance.

[0047] The top surface of the nail cap 121 is lower than the top of the second guide surface 1113. With this structure, the nail cap 121 can be thinner and easier to weld, and the nail cap 121 can be located in the injection hole 111 to prevent the nail cap 121 from being scratched by other structures.

[0048] The assembly process of the square battery of the preferred embodiment of the utility model is as follows:

[0049] 1. Connect the cover plate 11 to the opening of the housing;

[0050] 2. Inject electrolyte into the interior of the square battery through the injection hole 111;

[0051] 3. Fix the hose 123 on the nail column 122;

[0052] 4. Insert the nail column 122 into the hole formed by the first guide surface 1111 and the cylindrical surface 1114, so that the rubber tube 123 is clamped between the cylindrical surface 1114 and the nail column 122, and the expansion part 1231 abuts against the bottom edge of the cylindrical surface 1114. When inserting, the electrolyte on the first guide surface 1111 is scraped to the bottom through the expansion part 1231;

[0053] 5. Weld the nail cap 121 onto the cover plate 11.

[0054] This completes the assembly process of the square battery of this preferred embodiment.

[0055] The cover plate assembly and square battery for preventing electrolyte residue of the utility model can make the electrolyte residue on the cover plate flow into the injection hole through the second guide surface, the straight surface can limit the nail cap, and the bottom end of the first guide surface can limit the nail column. The straight surface and the first guide surface, and the second guide surface and the straight surface are smoothly transitioned through the arc surface, which can make the electrolyte flow smoothly at the connection between the straight surface and the first guide surface, and at the connection between the second guide surface and the straight surface. The first guide surface is inclined, so that the electrolyte can easily flow from the straight surface to the first guide surface. The aperture of the first guide surface has a large opening at the upper end and a small opening at the lower end, which is also convenient for the nail column to penetrate into the hole surrounded by the first guide surface. The cover plate assembly and square battery for preventing electrolyte residue of the utility model can make the electrolyte flow smoothly in the injection hole and facilitate the placement of sealing nails.

[0056] To sum up, although the present invention has been disclosed as above in the form of preferred embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the concept of the technical solution of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cover plate assembly for preventing electrolyte residue, characterized in that: include: A cover plate, which is provided with a liquid injection hole, wherein the side wall of the liquid injection hole comprises a first guide surface, a straight surface, and a second guide surface arranged in sequence along the axial direction thereof, wherein the first guide surface is closer to the bottom surface of the cover plate relative to the straight surface, the straight surface is perpendicular to the central axis of the liquid injection hole, the first guide surface and the second guide surface are both inclined to the central axis of the liquid injection hole, the apertures of the first guide surface and the second guide surface gradually increase from the bottom surface of the cover plate to the top surface of the cover plate, the angle between the second guide surface and the central axis of the liquid injection hole is greater than the angle between the first guide surface and the central axis of the liquid injection hole; the straight surface and the first guide surface, and the second guide surface and the straight surface are both smoothly transitioned through arc surfaces; as well as, The sealing nail comprises a nail cap and a nail column, wherein the periphery of the nail cap is connected to the straight surface, the nail column is connected to the center of the bottom surface of the nail cap, and the nail column is penetrated into the inner cavity of the first guide surface.

2. The cover plate assembly for preventing electrolyte residue according to claim 1, characterized in that: The side wall of the injection hole also includes a cylindrical surface, which is connected to the first guide surface. The cylindrical surface is close to the bottom surface of the cover plate relative to the first guide surface. The cylindrical surface is parallel to the central axis of the injection hole, and the nail column is penetrated by the cylindrical surface; the sealing nail also includes a hose, which is sleeved on the nail column, and the hose is clamped between the cylindrical surface and the nail column.

3. The cover plate assembly for preventing electrolyte residue according to claim 2, characterized in that: A trumpet-shaped expansion portion is provided at one end of the hose away from the nail cap, and the outer diameter of the expansion portion gradually increases from the end close to the nail cap to the end away from the nail cap. The maximum outer diameter of the expansion portion is smaller than the maximum aperture of the first guide surface.

4. The cover plate assembly for preventing electrolyte residue according to claim 3, characterized in that: The rubber hose is fixed to the nail column, and the expansion portion abuts against the bottom edge of the column surface.

5. The cover plate assembly for preventing electrolyte residue according to claim 2, characterized in that: The bottom surface of the cover plate is provided with a boss, and the first flow guide surface and the cylindrical surface are both provided on the boss.

6. The cover plate assembly for preventing electrolyte residue according to claim 1, characterized in that: The side wall of the injection hole also includes a third guide surface, the third guide surface is connected to the second guide surface, the third guide surface is closer to the top surface of the cover plate relative to the second guide surface, the third guide surface is inclined to the central axis of the injection hole, the aperture of the third guide surface gradually increases from the bottom surface of the cover plate to the top surface of the cover plate, and the angle between the third guide surface and the central axis of the injection hole is greater than the angle between the second guide surface and the central axis of the injection hole.

7. The cover plate assembly for preventing electrolyte residue according to claim 6, characterized in that: The connection between the third guide surface and the second guide surface is smoothly transitioned through a curved surface.

8. The cover plate assembly for preventing electrolyte residue according to any one of claims 1 to 7, characterized in that: The cover plate and the sealing nail are both made of metal, and the edge of the nail cap is welded to the cover plate.

9. The cover plate assembly for preventing electrolyte residue according to claim 8, characterized in that: The top surface of the nail cap is lower than the top end of the second flow-guiding surface.

10. A square battery, characterized in that: include: The cover plate assembly for preventing electrolyte residue according to any one of claims 1 to 9; as well as, The cover is connected to the opening of the shell.

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