Cover plate assembly and button cell

Abstract

In order to solve the problem that in the prior art, the assembling mode of a button cell cannot meet the requirement for bearing buckling pressure, the cover plate assembly comprises a cover plate and a pole, the pole comprises a pole body and an extending part, an eccentric hole is formed in the position deviating from the center of the cover plate, the pole body is contained in the eccentric hole, and the extending part extends out of the pole body. The extension part extends along the surface of one side of the cover plate, and the overlapped part of the extension part and the projection surface of the cover plate is used for being buckled with the probe. According to the cover plate assembly provided by the utility model, the force of the post body of the post in a buckling installation process or a subsequent use process is transferred to the extension part and the cover plate, and the cover plate is relatively high in rigidity and is formed by welding the cover plate and the shell, so that the shell can bear part of the force, the yield of a battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to a cover plate assembly and a button battery. Background Art

[0002] With the development of portable electronic products, smart wearable products, medical instruments, etc., batteries have become more miniaturized. Therefore, a kind of battery with small volume, high specific energy, good sealing performance, small self-discharge, and high reliability has been developed. Because of its shape like a button, it is commonly called a button battery.

[0003] Currently, the installation method of button batteries applied to consumer products is mainly the snap-in installation method with probes snapped on the battery surface. The probes not only undertake the electrical connection of the battery but also play a limiting role. The existing battery cover plate assembly mechanism is as follows: a pole hole is provided at the center position of the steel cover plate, an aluminum pole is provided in the pole hole, and the aluminum pole is insulated from the steel cover plate. The probe is located directly above the column body of the pole. Since most of the column body is in a suspended state and the aluminum pole is soft, during long-term use or during the snap-in process, due to being easily squeezed, the battery is deformed, affecting the yield or service life of the battery. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a cover plate assembly and a button battery for the problem that the assembly method of the button battery in the prior art cannot bear the snap-in pressure.

[0005] The technical solutions adopted by the utility model to solve the above technical problems are as follows:

[0006] Provide a cover plate assembly, including a cover plate and a pole. The pole includes a column body and an extension part extending along the circumferential side of the column body. An eccentric hole is provided at a position deviating from the center of the cover plate. The column body is accommodated in the eccentric hole. The cover plate has opposite sides in the thickness direction. The extension part extends along one side surface of the cover plate. The extension part is insulated from the cover plate. The part of the extension part overlapping with the projection surface of the cover plate is used for snap-in installation with the probe.

[0007] Optionally, the extension part covers the center position of the cover plate.

[0008] Optionally, the distance between the center of the cover plate and the center of the eccentric hole is 1-2 mm.

[0009] Optionally, an annular gap is formed between the column body and the hole wall of the eccentric hole, and the annular gap is used to accommodate the overflow glue after hot pressing of the insulating glue layer.

[0010] Optionally, the insulating adhesive layer is an annular sheet structure surrounding the outer periphery of the eccentric hole. The insulating adhesive layer is disposed between the extension portion and the cover plate, and the inner edge of the insulating adhesive layer extends beyond the inner edge of the eccentric hole, and the outer edge of the insulating adhesive layer extends beyond the outer edge of the extension portion.

[0011] Optionally, the length by which the insulating adhesive layer extends beyond the edge of the extension portion is ≥0.2 mm.

[0012] Optionally, the combined length of the extension portion, the insulating adhesive layer, and the cover plate is ≥1.5 mm.

[0013] On the other hand, the present application provides a button cell, including a housing, an electrode core, and the cover plate assembly. The housing is a semi-closed housing with an opening on one side. The electrode core is disposed inside the housing, and the cover plate assembly closes the opening of the housing.

[0014] Optionally, it further includes a positive tab and a negative tab. The positive tab is led out from one end face of the electrode core and extends to the position of the column body to be electrically connected to the column body; the negative tab is led out from the end face of the electrode core facing away from the cover plate and is electrically connected to the housing.

[0015] Optionally, the cover plate assembly is connected to the housing by welding, and the welding methods include laser welding, resistance welding, or ultrasonic welding.

[0016] The beneficial effects of the present application are as follows:

[0017] Since the probe is basically unchanged on the electrical device, through the cover plate assembly provided by the present utility model, the force on the column body of the pole column during the snap-in installation process or subsequent use is transferred to the extension portion and the cover plate. And because the cover plate has relatively high rigidity and the cover plate is welded to the housing, the housing can also bear part of the force, thereby improving the yield rate and service life of the battery. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the cover plate assembly provided by the present utility model;

[0019] Figure 2 is a top view of the cover plate provided by the present utility model;

[0020] Figure 3 is an assembly structure diagram of a button cell provided by an embodiment of the present utility model;

[0021] Figure 4 is an assembly structure diagram of a button cell provided by another embodiment of the present utility model.

[0022] The reference numerals in the accompanying drawings of the specification are as follows:

[0023] 1. Cover plate; 2. Terminal post; 21. Cylinder; 22. Extension part; 3. Eccentric hole; 4. Insulating glue layer; 5. Shell; 6. Battery cell; 7. Positive tab; 8. Negative tab. Detailed implementation mode

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model 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 cannot be understood as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] The embodiment of the present utility model provides a cover plate assembly, including a cover plate 1 and a terminal post. The terminal post includes a cylinder and an extension part extending along the circumferential side of the cylinder. An eccentric hole is provided at a position deviating from the center of the cover plate 1. The cylinder is accommodated in the eccentric hole. The cover plate 1 has opposite sides in the thickness direction. The extension part extends along one side surface of the cover plate 1. The extension part is insulated from the cover plate 1. The part of the extension part overlapping with the projection surface of the cover plate 1 is used for snap-fastening installation with a probe.

[0028] Since the probe is basically unchanged on the electrical device, through the cover plate assembly provided by the present utility model, the force of the cylinder of the terminal post during the snap-fastening installation process or subsequent use is transferred to the extension part and the cover plate 1. And because the cover plate 1 has high rigidity and the cover plate 1 is welded to the shell, the shell can also bear part of the force, thereby improving the yield rate and service life of the battery.

[0029] On the other hand, the overlapping part of the extension and the projection plane of the cover plate 1 is used for snap-fitting with the probe. Due to the rigidity of the cover plate 1 itself and its combination with the extension, it can well bear the pressure during the snap-fitting process of the button cell and in subsequent use.

[0030] In one embodiment, the extension 22 covers the central position of the cover plate 1.

[0031] Specifically, by setting the extension 22 to cover the central position of the cover plate 1, the pressure of the snap is prevented from directly acting on the cover plate 1, thereby providing sufficient supporting force for the snap-fitting process of the machine.

[0032] In one embodiment, the distance between the center of the cover plate 1 and the center of the eccentric hole 3 is 1 - 2 mm.

[0033] Specifically, this application limits the distance between the center of the cover plate 1 and the center of the eccentric hole 3, aiming to ensure that there is enough area for snap pressure during the snap-fitting process of the button cell on the same side; the distance between the center of the cover plate 1 and the center of the eccentric hole 3 can be 1 mm, 1.3 mm, 1.5 mm, 1.8 mm or 2 mm.

[0034] In one embodiment, an annular gap is formed between the column 21 and the hole wall of the eccentric hole 3, and the annular gap is used to accommodate the overflow glue after hot pressing of the insulating glue layer 4.

[0035] Specifically, the insulating glue layer 4 is prone to overflow glue after hot pressing. In this application, the cover plate assembly forms an annular gap between the column 21 and the hole wall of the eccentric hole 3, and this annular gap accommodates the overflow glue after hot pressing of the insulating glue layer, effectively improving the problem that the insulating glue layer 4 overflows to the surfaces of the cover plate 1 and the pole column 2 after hot pressing.

[0036] In one embodiment, it further includes an insulating glue layer 4. The insulating glue layer 4 is an annular sheet structure surrounding the outer periphery of the eccentric hole 3. The insulating glue layer 4 is arranged between the extension 22 and the cover plate 1, and the inner edge of the insulating glue layer 4 extends out of the inner edge of the eccentric hole 3, and the outer edge of the insulating glue layer 4 extends out of the outer edge of the extension 22.

[0037] Specifically, the pole column 2 mainly functions to conduct current. The insulating glue layer 4 arranged between the pole column 2 and the cover plate 1 can well isolate the pole column 2 from the cover plate 1. The setting that the inner edge of the insulating glue layer 4 extends out of the inner edge of the eccentric hole 3 and the outer edge of the insulating glue layer 4 extends out of the outer edge of the extension 22 can prevent the pole column 2 from directly contacting the cover plate 1 and causing a short-circuit problem.

[0038] Specifically, the material of the insulating adhesive layer 4 can be a material that can achieve good insulation effects, such as polyethylene material, polypropylene material, ethylene propylene diene monomer (EPDM) rubber material, or polyimide material.

[0039] In one embodiment, the length by which the outer edge of the insulating adhesive layer 4 extends beyond the outer edge of the extension portion 22 is ≥0.2 mm.

[0040] Specifically, when the length by which the outer edge of the insulating adhesive layer 4 extends beyond the outer edge of the extension portion 22 is ≥0.2 mm, it can isolate the contact between the outer edges of the pole column 2 and the extension portion 22 and the cover plate 1, thereby avoiding the short - circuit situation caused by their direct contact.

[0041] In one embodiment, the composite length of the extension portion 22, the insulating adhesive layer 4, and the cover plate 1 is ≥1.5 mm.

[0042] Specifically, in the cover plate assembly, the extension portion 22, the insulating adhesive layer 4, and the cover plate 1 on one side are composite. Compared with the prior art, the strength is improved after composite, which is conducive to subsequent pressing and buckling on the same side of the battery cell. Specifically, one side of the insulating adhesive layer 4 is covered on the side of the cover plate 1 away from the column body 21, and the other side of the insulating adhesive layer 4 is in contact with the extension portion 22. When the length of the completely overlapping part of the three is ≥1.5 mm, it can simultaneously satisfy sharing the pressing pressure of buckling the battery cell up and down and buckling on the same side, and avoid damaging the pole column 2 during the buckling pressing process.

[0043] Specifically, the composite method of the insulating adhesive layer 4 with the extension portion 22 and the cover plate 1 is hot - press composite.

[0044] In one embodiment, the material of the cover plate 1 is stainless steel.

[0045] In another embodiment, the present application provides a button cell, including a housing 5, a battery cell 6, and the cover plate assembly. The housing 5 is a semi - enclosed housing with an opening on one side. The battery cell 6 is placed inside the housing 5, and the cover plate assembly closes the opening of the housing 5.

[0046] Specifically, the body of the battery cell 6 is loaded into the housing 5, and liquid is injected through the semi - enclosed opening of the housing 5. Finally, it is encapsulated with the cover plate assembly to obtain a button cell with a closed interior and complete assembly. In the button cell of the present application, the pole column 2 in the cover plate assembly is assembled with the eccentric hole 3, and the extension portion 22 of the pole column 2 is composite with the cover plate 1. The setting of the composite of the extension portion 22 and the cover plate 1 can share the stress of buckling in the buckling assembly of the button cell, thereby playing a good pressure - bearing role and avoiding the extrusion of the pole column 2 caused by buckling pressing.

[0047] Specifically, the probe snap-fitted to the extension part 22 is a first-polarity probe. To match the structure in which the first-polarity probe and the second-polarity probe of the existing electrical structure are arranged on opposite sides, the bottom of the housing 5 is used for snap-fitting with the second-polarity probe of the electrical device; in another embodiment, in order to reduce the height of the electrical device, the first-polarity probe is arranged on the same side as the second-polarity probe. To adapt to this design, the part of the cover plate 1 not covered by the projection surface of the extension part 22 is used for snap-fitting with the second-polarity probe.

[0048] It should be noted that the polarities of the first-polarity probe and the second-polarity probe are opposite.

[0049] In one embodiment, it further includes a positive electrode tab 7 and a negative electrode tab 8. The positive electrode tab 7 is led out from one end face of the battery cell 6 and extends to the position of the column body 21 for electrical connection with the column body 21; the negative electrode tab 8 is led out from the end face of the battery cell 6 facing away from the cover plate and is electrically connected to the housing 5.

[0050] For the two electrode tabs led out from the battery cell 6, one positive electrode tab 7 is electrically connected to the pole column 2, and the other negative electrode tab 8 is electrically connected to the housing 5, which avoids the problem of battery short circuit. Moreover, the negative electrode tab 8 connected to the housing 5 also directly contacts other electronic components in the housing 5, reducing the connection impedance without reducing the battery energy density, and the connection structure is simple and stable.

[0051] In one embodiment, the cover plate assembly is welded to the housing 5, and the welding methods include laser welding, resistance welding or ultrasonic welding.

[0052] Specifically, electrolyte is injected into the cavity of the housing 5. After the injection is completed, the assembly gap between the cover plate assembly and the housing 5 is welded to connect and seal the overall assembly of the button cell.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cover plate assembly, characterized in that, It includes a cover plate and a pole, the pole includes a column and an extension portion extending along the circumference of the column, an eccentric hole is provided at a position deviating from the center of the cover plate, the column is accommodated in the eccentric hole, the cover plate has two opposite sides in the thickness direction, the extension portion extends along one side surface of the cover plate, the extension portion is insulated and connected to the cover plate, and the portion of the extension portion overlapping with the projection surface of the cover plate is used for mounting with a probe clip.

2. The cover plate assembly according to claim 1, characterized in that, The extension portion covers the center position of the cover plate.

3. A cover plate assembly according to claim 1, wherein, The distance between the center of the cover plate and the center of the eccentric hole is 1-2 mm.

4. A cover plate assembly according to claim 1, characterized in that, It also includes an insulating rubber layer, which is an annular sheet structure surrounding the outer periphery of the eccentric hole. The insulating rubber layer is arranged between the extension part and the cover plate, and the inner edge of the insulating rubber layer extends out of the inner edge of the eccentric hole, and the outer edge of the insulating rubber layer extends out of the outer edge of the extension part.

5. A cover plate assembly according to claim 4, wherein, The length of the outer edge of the insulating rubber layer exceeding the outer edge of the extension portion is greater than or equal to 0.2 mm.

6. A cover plate assembly according to claim 4, characterized in that, The combined length of the extension portion, the insulating adhesive layer and the cover plate is ≥1.5 mm.

7. A cover plate assembly according to claim 4, wherein, An annular gap is formed between the column and the wall of the eccentric hole, and the annular gap is used to accommodate overflow of the insulating adhesive layer after hot pressing.

8. A button cell, characterized in that, The battery cell comprises a shell, a battery cell and a cover plate assembly according to any one of claims 1 to 7, wherein the shell is a semi-enclosed shell with an opening on one side, the battery cell is placed inside the shell, and the cover plate assembly closes the opening of the shell.

9. A button cell according to claim 8, wherein, It also includes a positive tab and a negative tab. The positive tab is led out from one end face of the battery cell and extends to the column position and is electrically connected to the column; the negative tab is led out from one end face of the battery cell away from the cover plate and is electrically connected to the shell.

10. A button cell according to claim 8, characterized in that, The cover plate assembly is connected to the shell by welding, and the welding method includes laser welding, resistance welding or ultrasonic welding.

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