Cover plate assembly and shell suitable for button type lithium ion battery, button type lithium ion battery and electronic product

Abstract

The utility model relates to the field of lithium ion batteries, and discloses a cover plate assembly and a shell suitable for a button type lithium ion battery, the button type lithium ion battery, a cover plate, a shell and an electronic product. The cover plate assembly comprises a first metal cover plate, an insulating layer and a second metal cover plate, the second metal cover plate is hermetically combined on the bottom surface of the first metal cover plate, and the insulating layer is hermetically combined between the first metal cover plate and the second metal cover plate and insulates the first metal cover plate and the second metal cover plate; the outer edge of the first metal cover plate exceeds the outer edge of the insulating layer and the outer edge of the second metal cover plate and serves as the outer edge of the cover plate assembly, the first metal cover plate and the insulating layer are internally provided with through holes with the centers right facing each other respectively, the area, right facing the through holes, of the second metal cover plate is bent and protrudes out of the through holes, and a concave position is formed in the bottom face of the second metal cover plate and used for welding of a tab. By adopting the technical scheme, the sealing performance of the cover plate is improved, the electrode connection is convenient, and the battery capacity is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, in particular to a cover plate assembly and a shell suitable for a button-type lithium ion battery, a button-type lithium ion battery, a cover plate, a shell and an electronic product. Background Art

[0002] As the application of smart wearable products becomes more and more widespread, people's demand for small-sized button-type secondary rechargeable batteries (referred to as button-type lithium-ion batteries) is also increasing.

[0003] Button lithium-ion batteries are currently the most widely used type. Button lithium-ion batteries are increasingly used in smart wearable products, such as wireless Bluetooth headsets. As the application of button lithium-ion batteries becomes more and more widespread, such as headsets, the requirements for battery size and capacity are also getting higher and higher. Summary of the invention

[0004] One of the purposes of the embodiments of the utility model is to provide a cover plate assembly and a shell suitable for button-type lithium-ion batteries, button-type lithium-ion batteries, cover plates, shells and electronic products. The use of this technical solution is conducive to improving the sealing of the cover plate, facilitating electrode connection, and increasing battery capacity.

[0005] In a first aspect, the present embodiment provides a cover plate assembly suitable for a button-type lithium-ion battery, comprising:

[0006] a first metal cover plate, an insulating layer and a second metal cover plate,

[0007] The second metal cover plate is sealed and combined with the bottom surface of the first metal cover plate, the insulating layer is sealed and combined between the first metal cover plate and the second metal cover plate, insulatingly separating the first metal cover plate and the second metal cover plate, and the outer edge of the first metal cover plate exceeds the outer edge of the insulating layer and the second metal cover plate, serving as the outer edge of the cover plate assembly.

[0008] The first metal cover plate and the insulating layer are respectively provided with through holes facing each other in the center. The area of ​​the second metal cover plate facing the through hole is bent and protrudes into the through hole, and a concave position is formed on the bottom surface of the second metal cover plate for welding of the tab.

[0009] Optionally, on the top surface of the cover plate assembly, a top of the protrusion of the second metal cover plate is flush with the top surface of the first metal cover plate, or protrudes from the top surface of the first metal cover plate.

[0010] Optionally, the first metal cover plate and the second metal cover plate are metal plates with uniform thickness.

[0011] Optionally, the protrusion of the second metal cover plate located in the through hole is formed by stamping.

[0012] Optionally, a shape of a top surface of the protrusion of the second metal cover plate is different from a shape of the first metal cover plate.

[0013] Optionally, an outer edge of the insulating layer exceeds an outer edge of the second metal cover plate.

[0014] In a second aspect, the housing for a button-type lithium-ion battery provided by an embodiment of the utility model includes:

[0015] Any of the above-mentioned cover plate assemblies,

[0016] The top of the metal shell is open, the cover assembly is sealed to the opening of the metal shell, the outer edge of the first metal cover is connected to the end face of the opening of the metal shell by metal melting and sealing, and a sealed chamber is formed between the metal shell and the cover assembly to accommodate the lithium-ion battery cell.

[0017] Optionally, the metal shell is formed by stamping a steel plate.

[0018] In a third aspect, the button-type lithium-ion battery provided by the embodiment of the utility model comprises:

[0019] Any of the above-mentioned housings,

[0020] The lithium-ion battery cell is sealed in the shell, one of the first electrode and the second electrode is welded to the concave position on the bottom surface of the second metal cover plate of the cover plate assembly, and the other is welded to the metal shell or the first cover plate.

[0021] In a third aspect, an electronic product provided by an embodiment of the utility model includes: a battery compartment, in which the above-mentioned button-type lithium-ion battery is arranged to drive a circuit module of the electronic product.

[0022] As can be seen from the above, the metal solution of the embodiment of the utility model has the following beneficial effects:

[0023] The second metal cover plate as the inner plate is located on the bottom surface of the first cover plate assembly and is located in the shell of the button-type lithium-ion battery. The area of ​​the second metal cover plate located in the through hole protrudes toward the through hole for connection to the external electrode, and the area located at the periphery of the through hole is sealed and combined to the bottom surface of the first metal cover plate through an insulating layer. During the application of the button-type lithium-ion battery, the air pressure in the shell of the button-type lithium-ion battery increases. Under the action of the internal air pressure, the second metal cover plate has a pressure that further adheres to the direction of the first metal cover plate, and the tightness of the connection between the first metal cover plate and the second metal cover plate in the cover plate assembly is further improved, which is beneficial to improving the sealing performance of the cover plate assembly.

[0024] In addition, a recess for electrode welding is formed on the second metal cover plate, and space for electrode welding is reserved on the cover plate assembly, which is beneficial to improving the space utilization rate in the shell and increasing the capacity of the button lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute an improper limitation of the present invention.

[0026] Figure 1 A schematic diagram of the main structure of a cover plate provided in Example 1 of the utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the side structure of the cover plate shown;

[0028] Figure 3 for Figure 1 A schematic diagram of the top view of the cover plate shown;

[0029] Figure 4 for Figure 1 A schematic diagram of the structure of the cover plate as viewed from above;

[0030] Figure 5 for Figure 1 A schematic diagram of the exploded structure of the cover plate shown;

[0031] Figure 6 for Figure 5 The structural schematic diagram of the cover plate before stamping;

[0032] Figure 7 A schematic diagram of the three-dimensional structure of a button-type lithium-ion battery provided in Example 1 of the utility model;

[0033] Figure 8 for Figure 7 The main structural diagram of the button-type lithium-ion battery shown;

[0034] Fig. 9 for Figure 7 A schematic diagram of the top view of a button-type lithium-ion battery shown;

[0035] Fig.10 for Figure 7 A bottom-up structural diagram of a button-type lithium-ion battery is shown;

[0036] Fig.11 for Figure 7 A schematic perspective view of the exploded structure of the shell of a button-type lithium-ion battery shown;

[0037] Fig.12 for Fig.11A schematic front view of the exploded structure of the housing of a button-type lithium-ion battery shown;

[0038] 1: metal shell; 2: cover plate assembly; 21: first metal cover plate; 211: first through hole; 22: second metal cover plate; 221: protrusion; 23: insulation layer; 231: second through hole. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0040] Examples of embodiments of the present invention described in detail below are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0041] The embodiments described below with reference to the drawings attached to this specification are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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. Example

[0044] See also Figure 1-12 .

[0045] This embodiment provides a cover plate assembly 2 suitable for a button-type lithium-ion battery. The cover plate assembly 2 includes: a first metal cover plate 21, an insulating layer 23, and a second metal cover plate 22, wherein the first metal cover plate 21 is horizontal, and when the cover plate assembly 2 is assembled and applied to the button-type lithium-ion battery, the first metal cover plate 21 is located on the top surface of the shell of the button-type lithium-ion battery, serving as the outer plate of the cover plate, and the surface of the first metal cover plate 21 exposed outside the button-type lithium-ion battery is hereinafter referred to as the top surface, and the surface opposite thereto is referred to as the bottom surface.

[0046] The second metal cover plate 22 is sealed and combined with the bottom surface of the first metal cover plate 21 through the insulating layer 23. The insulating layer 23 is sealed and combined between the first metal cover plate 21 and the second metal cover plate 22 to insulate and separate the first metal cover plate 21 and the second metal cover plate 22. The two surfaces of the insulating layer 23 are respectively sealed and combined with the bottom surface of the first metal cover plate 21 and the top surface of the second metal cover plate 22 that are tightly attached to it to form an integrated cover plate assembly 2, wherein the first metal cover plate 21 and the second metal cover plate 22 are respectively used as electrodes of button-type lithium-ion batteries.

[0047] In the cover plate assembly 2, a first through hole 211 and a second through hole 231 are respectively opened in the first metal cover plate 21 and the insulating layer 23. The centers of the first through hole 211 and the second through hole 231 on the first metal cover plate 21 and the insulating layer 23 are opposite, and the aperture of the second through hole 231 is smaller than the aperture of the first through hole 211. The second metal cover plate 22 is blocked in the first through hole 211 and the second through hole 231 of the first metal cover plate 21 and the insulating layer 23 to seal the first through hole 211 and the second through hole 231. In this embodiment, the second metal cover plate 22 is bent into the through holes in the area facing the first metal cover plate 21, the first through hole 211 and the second through hole 231 of the insulating layer 23, and the protrusion 221 is in the second through hole 231 of the insulating layer 23. The insulating layer 23 in the first through hole 211 is spaced between the first metal cover plate 21 and the second metal cover plate 22. Accordingly, a concave position is formed on the bottom surface of the second metal cover plate 22 (in the accompanying drawings, the edge of the concave position is in the shape of an arc bent surface and is therefore not drawn) for the electrode ear welding.

[0048] As an illustration of this embodiment, a planar sheet of metal sheets with uniform thickness can be used as the first metal cover plate 21 and the second metal cover plate 22, but is not limited thereto. The first metal cover plate 21 is pre-opened with a first through hole 211. The sheet-shaped insulating layer 23 is tightly attached to the bottom surface of the first metal cover plate 21, and the through holes are directly opposite to each other. The inner edge of the insulating layer 23 slightly protrudes from the first through hole 211 of the first metal cover plate 21. The second metal cover plate 22 is in the form of a planar sheet and tightly attached to the bottom surface of the insulating layer 23 to seal the first metal cover plate 21. The first through hole 211 of the metal cover plate 21 and the second through hole 231 of the insulating layer 23 are stacked into a three-layer structure and positioned on a predetermined stamping positioning device. From the bottom surface of the second metal cover plate 22, the area of ​​the second metal cover plate 22 facing the first through hole 211 and the second through hole 231 is stamped, so that the area of ​​the second metal cover plate 22 is deformed and bent toward the first through hole 211 and the second through hole 231 to form a protrusion 221, and a concave position for welding the pole ear of the power supply core is formed on the bottom surface of the second metal cover plate 22.

[0049] As an illustration of this embodiment, the stamping stroke of the second metal cover plate 22 is set to control the height of its protrusion 221, so that when viewed from the top surface of the cover plate assembly 2, the top of the protrusion 221 of the second metal cover plate 22 located in the first through hole 211 of the first metal cover plate 21 is flush with the top surface of the first metal cover plate 21. Alternatively, but not limited to, the top of the protrusion 221 of the second metal cover plate 22 located in the through hole of the first metal cover plate 21 is higher than the top surface of the first metal cover plate 21, and the protrusion 221 is on the top surface of the cover plate assembly 2. The specific setting depends on the electrode connection method and structure of the button battery application.

[0050] As an illustration of this embodiment, it is preferred that the outer edge of the insulating layer 23 extends beyond the outer edge of the second metal cover plate 22 to increase the bonding area between the insulating layer 23 and the second metal cover plate 22 and improve the sealing bonding reliability.

[0051] As an illustration of this embodiment, the colloids on both surfaces of the insulating layer 23 can be heated and melted into a fluid to be fully combined with the surface of the metal cover plate in close contact with it by but not limited to thermal composite method. After shaping and cooling, the thermally composited cover plate assembly 2 is obtained.

[0052] As an illustration of this embodiment, the second metal cover plate 22 of this embodiment can be, but is not limited to, made of aluminum.

[0053] As an illustration of this embodiment, the first metal cover plate 21 may be, but is not limited to, a thin steel plate.

[0054] When the cover assembly 2 of this embodiment is applied to a button-type lithium-ion battery, it can be used as the cover assembly 2 of the shell, wherein the button-type lithium-ion shell includes a metal shell 1, and the metal shell 1 is a cavity with one end open. As an illustration of this embodiment, the metal shell 1 can be, but is not limited to, formed by stamping a thinner steel plate, the thickness of the shell wall of the shell is the thickness of the steel plate, and the stamping opening serves as the opening of the shell. The cover assembly 2 is sealed on the opening of the shell, specifically, the bottom surface of the outer edge of the first metal cover plate 21 is connected to the end surface of the lateral shell wall at the opening of the metal shell 1 by metal melting and sealing, and a sealed chamber is formed between the metal shell 1 and the cover assembly 2 to accommodate the battery cell of the lithium-ion battery.

[0055] As an illustration of this embodiment, laser welding can be used, but is not limited to, to melt and seal the bottom surface of the outer edge of the first metal cover plate 21 and the top end surface of the opening of the metal shell 1 into one.

[0056] The assembly principle of the button-type lithium-ion battery is to place the battery cell of the button-type lithium-ion battery into a shell, weld one of the first electrode and the second electrode of the battery cell to the inner wall of the shell or the bottom surface of the first metal cover plate 21 of the cover plate assembly 2 located outside the insulating layer 23, and weld the other to the recessed position on the bottom surface of the second metal cover plate 22.

[0057] As can be seen from the above, the metal solution of this embodiment has the following beneficial effects:

[0058] The second metal cover plate 22 as the inner plate is located on the bottom surface of the first cover plate assembly 2 and is located in the shell of the button-type lithium-ion battery. The area of ​​the second metal cover plate 22 located in the first through hole 211 and the second through hole 231 protrudes 221 toward the through hole for connection to the external electrode. The area located outside the first through hole 211 and the second through hole 231 is sealed and combined to the bottom surface of the first metal cover plate 21 through the insulating layer 23. During the use of the button-type lithium-ion battery, the air pressure in the shell of the button-type lithium-ion battery increases. Under the action of the internal air pressure, the second metal cover plate 22 has a pressure that further adheres to the direction of the first metal cover plate 21. The tightness of the connection between the first metal cover plate 21 and the second metal cover plate 22 in the cover plate assembly 2 is further improved, which is beneficial to improving the sealing performance of the cover plate assembly 2.

[0059] In addition, a recess for electrode welding is formed on the second metal cover plate 22, and space for electrode welding is reserved on the cover plate assembly 2, which is beneficial to improving the space utilization rate in the shell and increasing the capacity of the button-type lithium-ion battery.

[0060] As an illustration of this embodiment, it is preferred to weld the positive electrode of the battery cell to the second metal cover plate 22, using the second metal cover plate 22 as the positive electrode of the button-type lithium-ion battery, and weld the negative electrode of the battery cell to the shell or the first metal cover plate 21, using the shell and the first metal cover plate 21 as the negative electrode of the battery.

[0061] As an illustration of this embodiment, the battery cell of the lithium-ion battery is a laminated battery cell.

[0062] As an illustration of this embodiment, a through hole serving as an injection hole is further provided on the bottom of the metal shell 1. When assembling the battery, after completing the electrode welding of the battery cell and the shell and laser welding of the cover assembly 2 to the metal shell 1, the electrolyte is injected through the injection port. After the electrolyte injection is completed, the injection port is covered with a metal sheet, and the surface of the metal sheet is laser welded to the metal of the shell bottom 11 which is the outer edge of the injection port to form a laser welding track surrounding the injection port to seal the injection port.

[0063] As an illustration of this embodiment, a cylindrical metal shell 1 may be used but is not limited to it, and the first metal cover plate 21 of the cover plate assembly 2 is circular in shape and size consistent with the circular opening of the metal shell 1 .

[0064] The protrusion 221 of the second metal cover plate 22 is non-circular and different from the first metal cover plate 21 . For example, the protrusion 221 may be designed as a combination of a rectangle and a semicircle, an ellipse, a square or other special shapes, but is not limited to the design.

[0065] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A cover plate assembly suitable for a button-type lithium-ion battery, characterized in that: include, a first metal cover plate, an insulating layer and a second metal cover plate, The second metal cover plate is sealed and combined with the bottom surface of the first metal cover plate, the insulating layer is sealed and combined between the first metal cover plate and the second metal cover plate, insulatingly separating the first metal cover plate and the second metal cover plate, and the outer edge of the first metal cover plate exceeds the outer edge of the insulating layer and the second metal cover plate, serving as the outer edge of the cover plate assembly. The first metal cover plate and the insulating layer are respectively provided with through holes facing each other in the center. The area of ​​the second metal cover plate facing the through hole is bent and protrudes into the through hole, and a concave position is formed on the bottom surface of the second metal cover plate for welding of the tab.

2. The cover plate assembly for button-type lithium-ion batteries according to claim 1, characterized in that: On the top surface of the cover plate assembly, the top of the protrusion of the second metal cover plate is flush with the top surface of the first metal cover plate, or protrudes from the top surface of the first metal cover plate.

3. The cover plate assembly for button-type lithium-ion batteries according to claim 1, characterized in that: The first metal cover plate and the second metal cover plate are metal plates with uniform thickness.

4. The cover plate assembly for button-type lithium-ion batteries according to claim 1, characterized in that: The protrusion of the second metal cover plate located in the through hole is formed by stamping.

5. The cover plate assembly for button-type lithium-ion batteries according to claim 1, characterized in that: The shape of the top surface of the protrusion of the second metal cover plate is different from that of the first metal cover plate.

6. The cover plate assembly for button-type lithium-ion batteries according to claim 1, characterized in that: The outer edge of the insulating layer exceeds the outer edge of the second metal cover plate.

7. A shell suitable for a button-type lithium-ion battery, characterized in that: include, The cover plate assembly according to any one of claims 1 to 6, The top of the metal shell is open, the cover assembly is sealed to the opening of the metal shell, the outer edge of the first metal cover is connected to the end face of the opening of the metal shell by metal melting and sealing, and a sealed chamber is formed between the metal shell and the cover assembly to accommodate the lithium-ion battery cell.

8. The housing for button-type lithium-ion batteries according to claim 7, characterized in that: The metal shell is formed by stamping a steel plate.

9. A button-type lithium-ion battery, characterized in that: include, The housing according to claim 7 or 8, The lithium-ion battery cell is sealed in the shell, one of the first electrode and the second electrode is welded to the concave position on the bottom surface of the second metal cover plate of the cover plate assembly, and the other is welded to the metal shell or the first cover plate.

10. An electronic product, characterized in that: include: A battery compartment, in which the button-type lithium-ion battery according to claim 9 is arranged to drive the circuit module of the electronic product.

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