Button cell

Abstract

In order to solve the problem that a button cell in the prior art cannot simultaneously meet the requirements of bearing the pressure in the buckle assembly process and improving the energy density, the utility model provides a button cell which comprises a cover plate assembly, a support column, a battery cell and a shell, the cover plate assembly comprises a cover plate and a pole column, the cover plate is provided with a mounting hole, the pole column is arranged in the mounting hole, the battery cell is arranged in the shell, and the support column is arranged in the shell. The cover plate is connected with the shell, a center hole is formed in the battery cell, the supporting column is arranged in the center hole, one end of the supporting column abuts against the pole, and the other end of the supporting column abuts against the shell. According to the button cell provided by the utility model, the supporting column is assembled with the central hole of the cell and is propped against the shell or the pole, so that a supporting effect is achieved, the extrusion of overlarge contact force of a probe clamping and buckling machine on the cell is relieved, on the other hand, the supporting column is used for supporting and fixing the roll core, and the collapse problem of the central hole of the roll core of the cell is solved; the button cell provided by the utility model can bear the stress generated in the button cell probe buckle mounting process, and meanwhile, the energy density of the button cell is ensured.

Description

Technical Field

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

[0002] With the increasing requirements for miniaturization and portability of electronic products and smart wearable products (TWS earphones), when producing TWS earphones in the prior art, the installation method of the battery cells adapted thereto has been adjusted. The original method of leading out the positive and negative electrodes by welding PIN angles or leads to the positive and negative end faces of the battery cells is changed to cancel the PIN angles at the positive and negative electrodes of the battery cells and directly install them on the surface of the battery cells by means of probe buckles. The advantage of this installation method is that after canceling the PIN angles or leads, the space thickness is saved and it is convenient to disassemble and replace the battery cells. The disadvantage is that in order to improve the ED (energy density) of the button cell, the thicknesses of the cover plate and the housing of the button cell become thinner, which in turn affects the pressure-bearing capacity during buckling. In addition, if the force of the probe buckle during the installation process is too large, it is easy to squeeze the battery cell and cause deformation, affecting the performance of the battery cell and posing a safety hazard during subsequent use. If the force of the probe buckle is too small, it is easy to cause poor contact between the probe and the battery cell, affecting the normal use of the earphone. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a button cell aiming at the problem that the existing button cell cannot simultaneously meet the requirements of bearing the pressure during the buckling assembly process and improving the energy density.

[0004] The technical solution adopted by the utility model to solve the above technical problem is as follows:

[0005] Provide a button cell, including a cover plate assembly, a support column, a battery cell and a housing. The cover plate assembly includes a cover plate and a pole column. An installation hole is provided on the cover plate, and the pole column is placed in the installation hole. The battery cell is placed in the housing. The cover plate is connected to the housing. A central hole is provided on the battery cell, and the support column is placed in the central hole. One end of the support column abuts against the pole column, and the other end of the support column abuts against the housing.

[0006] Optionally, the support column and the pole column are an integral structural member, and a first insulating adhesive layer is provided between the support column and the housing.

[0007] Optionally, the first insulating layer is circular and sheet-shaped, the diameter of the first insulating adhesive layer is 3.0 - 4.5 mm, and the thickness of the first insulating adhesive layer is 16 - 50 μm.

[0008] Optionally, the support column and the housing are an integral structural member, and the support column is a support member protruding from the bottom surface of the housing towards the battery cell, and a second insulating adhesive layer is provided between the support column and the pole column.

[0009] Optionally, the mounting hole is coaxially arranged with the central hole.

[0010] Optionally, the diameter of the support post is smaller than the inner diameter of the central hole, and the diameter of the support post is 1.0 - 2.5 mm.

[0011] Optionally, a step groove is further provided on the cover plate, the step groove is arranged around the outer periphery of the mounting hole, and the thickness of the cover plate is 3.5 - 6.0 mm.

[0012] Optionally, the pole post includes a column body and an extension ring, the extension ring is arranged around the outer periphery of the column body, and the extension ring is placed in the step groove.

[0013] Optionally, the cover plate assembly further includes a third insulating glue layer, the third insulating glue layer is an annular sheet structure surrounding the outer periphery of the mounting hole, the third insulating glue layer is arranged between the extension ring and the cover plate, and the inner edge of the third insulating glue layer extends out of the inner edge of the mounting hole, and the outer edge of the third insulating glue layer extends out of the outer edge of the extension ring.

[0014] Optionally, it further 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 position of the pole post to be electrically connected to the pole post; the negative tab is led out from the end face of the battery cell facing away from the cover plate and is electrically connected to the housing.

[0015] The beneficial effects of the present application are as follows:

[0016] The button cell provided by the present utility model includes a cover plate assembly, a support post, a battery cell and a housing, the cover plate assembly includes a cover plate and a pole post, a mounting hole is provided on the cover plate, the pole post is placed in the mounting hole, the battery cell is placed in the housing, a central hole is provided on the battery cell, the support post is placed in the central hole, one end of the support post abuts against the pole post, and the other end of the support post abuts against the housing; the setting that the support post is assembled with the central hole of the battery cell and one end of the support post abuts against the housing or the pole post plays a very good supporting role in the battery probe snap-on installation machine, bears the stress generated by the probe snap, and relieves the extrusion of the excessive contact force of the probe snap-on installation machine on the battery. On the other hand, in the present application, the support post is installed into the central hole of the battery cell, which plays a role of fixing and supporting the core body structure, can effectively improve the problem of the collapse of the central hole of the core during the normal use of the battery, and further improve the performance of the battery cell; compared with the prior art, the button cell described in the present application can not only bear the stress generated during the process of the button cell probe snap-on installation, but also ensure the energy density of the button cell. Description of the Drawings

[0017] Figure 1It is a schematic structural diagram of the cover plate assembly provided by the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the terminal post provided by an embodiment of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the housing provided by an embodiment of the present utility model;

[0020] Figure 4 It is an assembly structure diagram of a button cell provided by an embodiment of the present utility model;

[0021] Figure 5 It 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 assembly; 11. Cover plate; 111. Mounting hole; 112. Step groove; 12. Terminal post; 121. Column body; 122. Extension ring; 2. Support column; 3. Electric core; 31. Central hole; 4. Housing; 5. Positive tab; 6. Negative tab; 7. First insulating adhesive layer; 8. Second insulating adhesive layer; 9. Third insulating adhesive layer. Detailed implementation manners

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, 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 should not be construed as a limitation of the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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, and it can be the communication inside two components. 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 circumstances.

[0027] Referring to Figures 4 - 5 An embodiment of the present utility model provides a button cell, which includes a cover plate assembly 1, a support column 2, an electrode core 3, and a housing 4. The cover plate assembly 1 includes a cover plate 11 and a pole column 12. An installation hole 111 is provided on the cover plate 11, and the pole column 12 is placed in the installation hole 111. The electrode core 3 is placed in the housing 4. The cover plate 11 is connected to the housing 4. A central hole 31 is provided on the electrode core 3, and the support column 2 is placed in the central hole 31. One end of the support column 2 abuts against the pole column 12, and the other end of the support column 2 abuts against the housing 4.

[0028] Specifically, for the button cell provided by the present utility model, the setting that the support column 2 is assembled with the central hole 31 of the electrode core 3 and one end of the support column 2 abuts against the housing 4 or the pole column 12 plays a very good supporting role in the battery probe snap-on installation machine, bears the stress generated by the probe snap, and relieves the extrusion of the battery caused by the excessive contact force during the probe snap-on installation. On the other hand, in this application, the support column 2 is installed into the central hole 31 of the electrode core 3, which plays a role in supporting and fixing the structure of the wound core body, can effectively improve the problem of the collapse of the central hole 31 of the wound core during the normal use of the battery, and further improve the performance of the electrode core 3; compared with the prior art, the button cell described in this application can not only bear the stress generated during the button cell probe snap-on installation process, but also ensure the energy density of the button cell.

[0029] Specifically, the housing 4 is a semi-closed housing with an opening on one side. The electrode core 3 is placed inside the housing 4. Electrolyte is injected into the cavity of the housing 4. After the injection is completed, the assembly gap between the cover plate assembly 1 and the housing 4 is welded to connect and seal the overall assembly of the button cell.

[0030] Specifically, the welding method between the cover plate assembly 1 and the housing 4 includes laser welding, resistance welding, or ultrasonic welding.

[0031] Referring to Figure 4 , in one embodiment, the support column 2 and the pole column 12 are an integral structural member, and a first insulating glue layer 7 is provided between the support column 2 and the housing 4.

[0032] Specifically, when the support column 2 and the pole column 12 are an integral structural member ( Figure 2 ), one end of the support column 2 sequentially passes through the mounting hole 111 and the central hole 31 and abuts against the housing 4 to complete the connection with the battery cell 3. The support column 2 connected to the central hole 31 plays a good role in supporting and bearing pressure in the probe buckle assembly.

[0033] It should be noted that the direct contact between the positive and negative electrodes may cause abnormal current flow, resulting in a sharp increase in local current, causing battery short circuit and thermal runaway.

[0034] Specifically, when the support column 2 and the pole column 12 are an integral structural member, one end of the support column 2 sequentially passes through the mounting hole 111 and the central hole 31 and abuts against the housing 4. The support column 2 is made of a conductive material. At this time, there may be a situation where the polar pole column 12 is in direct contact with the housing 4 of the other polarity. Therefore, in the present application, the first insulating glue layer 7 is provided between the support column 2 and the housing 4, which can effectively avoid the short circuit problem caused by the direct contact between the pole column 12 and the housing 4 with different polarities.

[0035] Referring to Figure 5 , in an embodiment, the support column 2 and the housing 4 are an integral structural member ( Figure 3 ), and the support column 2 is a hollow column protruding from the bottom surface of the housing 4 towards the battery cell 3, and a second insulating glue layer 8 is provided between the support column 2 and the pole column 12.

[0036] In an embodiment, the support column 2 and the housing 4 are an integral structural member, and the support column 2 is a support member protruding from the bottom surface of the housing 4 towards the battery cell 3, and a second insulating glue layer 8 is provided between the support column 2 and the pole column 12.

[0037] Specifically, the support column 2 and the housing 4 are an integral structural member. At this time, the support column 2 sequentially passes through the central hole 31 and the mounting hole 111 and then abuts against the pole column 12. This connection method can also bear the pressure of the buckle pressing, avoiding the extrusion of the battery during the installation process; that is, the support column 2 of the button cell described in the present application can be a structural member integrally formed with the pole column 12 or integrally formed with the housing 4. In addition, the support column 2 can be integrally formed with the pole column 12 or the housing 4 through a stamping process.

[0038] Specifically, since the support column 2 is made of a conductive material, when the support column 2 and the housing 4 are an integral structural member, there is also a problem that the direct contact between the positive and negative electrodes has an adverse effect on the battery. To solve this problem, the second insulating glue layer 8 is provided between the support column 2 and the pole column 12 to avoid the occurrence of battery short circuit.

[0039] In one embodiment, the length of the first insulating adhesive layer 7 is 3.0 - 4.5 mm, and the thickness of the first insulating adhesive layer 7 is 16 - 50 μm.

[0040] The length of the first insulating adhesive layer 7 may be 3.0 mm, 3.5 mm, 4.0 mm or 4.5 mm, and the thickness of the first insulating adhesive layer 7 may be 16 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm.

[0041] In one embodiment, the mounting hole 111 is coaxially arranged with the central hole 31.

[0042] Specifically, coaxially arranging the mounting hole 111 with the central hole 31 facilitates the installation and fixation of the support column 2, improving the assembly efficiency and the structural strength of the button cell after assembly.

[0043] In one embodiment, the diameter of the support column 2 is smaller than the inner diameter of the central hole 31, and the diameter of the support column 2 is 1.0 - 2.5 mm.

[0044] Specifically, setting the diameter of the support column 2 to be smaller than the inner diameter of the central hole 31 is beneficial to the connection and assembly of the support column 2 with the battery cell 3.

[0045] Specifically, the diameter of the support column 2 may be 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm or 2.5 mm.

[0046] In one embodiment, the lengths of the first insulating adhesive layer 7 and the second insulating adhesive layer 8 are both greater than the diameter of the support column 2.

[0047] Specifically, the lengths of the first insulating adhesive layer 7 and the second insulating adhesive layer 8 being both greater than the diameter of the support column 2 can well isolate the contact between the support column 2 and the column body 121 or the housing 4, avoiding short circuits.

[0048] In one embodiment, a stepped groove 112 is further provided on the cover plate 11. The stepped groove 112 is disposed around the outer periphery of the mounting hole 111, and the thickness of the cover plate 11 is 3.5 - 6.0 mm.

[0049] The stepped groove 112 serves as a receiving cavity. The thickness of the cover plate 11 may be 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm or 6.0 mm. The cover plate 11 can well play a pressure-bearing role within this thickness range.

[0050] In one embodiment, the terminal post 12 includes a column body 121 and an extension ring 122. The extension ring 122 is connected to the end of the column body 121 and is placed in the step groove 112.

[0051] The column body 121 of the terminal post 12 is connected to the support post 2 or the two are an integral structural member. The extension ring 122 is disposed around the outer periphery of the column body 121 and is placed in the step groove 112. This arrangement enables the extension ring 122 to be combined with the cover plate 11 and cooperate with the support post 2, so as to better distribute the pressure applied by the buckle.

[0052] In one embodiment, the cover plate assembly 1 further includes a third insulating glue layer 9. The third insulating glue layer 9 is an annular sheet structure surrounding the outer periphery of the mounting hole 111. The third insulating glue layer 9 is disposed between the extension ring 122 and the cover plate 11, and the inner edge of the third insulating glue layer 9 extends beyond the inner edge of the mounting hole 111, and the outer edge of the third insulating glue layer 9 extends beyond the outer edge of the extension ring 122.

[0053] Specifically, the terminal post 12 mainly functions to conduct current. The third insulating glue layer 9 disposed between the terminal post 12 and the cover plate 11 can well isolate the terminal post 12 from the cover plate 11. The inner edge of the third insulating glue layer 9 extends beyond the inner edge of the mounting hole 111, and the outer edge of the third insulating glue layer 9 extends beyond the outer edge of the extension ring 122, which can avoid the short - circuit problem caused by the direct contact between the terminal post 12 and the cover plate 11.

[0054] Specifically, the material of the second insulating glue layer 8 can be a material with good insulation effect such as polyethylene material, polypropylene material, ethylene - propylene - diene monomer material or polyimide material.

[0055] In one embodiment, it further includes a positive tab 5 and a negative tab 6. The positive tab 5 is led out from one end face of the battery cell 3 and extends to the position of the terminal post 12 to be electrically connected to the terminal post 12; the negative tab 6 is led out from the end face of the battery cell 3 facing away from the cover plate 11 and is electrically connected to the housing 4.

[0056] For the two tabs led out from the battery cell 3, one positive tab 5 is electrically connected to the terminal post 12, and the other negative tab 6 is electrically connected to the housing 4, which avoids the battery short - circuit problem. Moreover, the negative tab 6 connected to the housing 4 also directly contacts other electronic components in the housing 4, reducing the connection impedance without reducing the battery energy density, and the connection structure is simple and stable.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A button cell, characterized in that, It includes a cover plate assembly, a support column, a battery cell and a shell. The cover plate assembly includes a cover plate and a pole. The cover plate is provided with a mounting hole, the pole is placed in the mounting hole, the battery cell is placed in the shell, the cover plate is connected to the shell, a center hole is provided on the battery cell, the support column is placed in the center hole, one end of the support column abuts against the pole, and the other end of the support column abuts against the shell.

2. The button cell according to claim 1, wherein The support column and the pole are an integrated structural component, and a first insulating rubber layer is provided between the support column and the shell.

3. A button cell according to claim 2, characterized in that, The first insulating adhesive layer is in the shape of a circular sheet, the diameter of the first insulating adhesive layer is 3.0-4.5 mm, and the thickness of the first insulating adhesive layer is 16-50 μm.

4. A button cell according to claim 1, characterized in that, The support column and the shell are an integral structural member, and the support column is a support member formed by the bottom surface of the shell protruding toward the battery core. A second insulating rubber layer is provided between the support column and the pole.

5. A button cell according to claim 1, characterized in that, The mounting hole is coaxially arranged with the center hole.

6. A button cell according to claim 1, wherein, The diameter of the support column is smaller than the inner diameter of the central hole, and the diameter of the support column is 1.0-2.5 mm.

7. A button cell according to claim 1, characterized in that, The cover plate is further provided with a step groove, which is arranged around the outer periphery of the mounting hole. The thickness of the cover plate is 3.5-6.0 mm.

8. A button cell according to claim 7, characterized in that, The pole includes a column and an extension ring. The extension ring is arranged around the outer circumference of the column and is placed in the step groove.

9. A button cell according to claim 8, characterized in that, The cover plate assembly also includes a third insulating rubber layer, which is an annular sheet structure surrounding the outer periphery of the mounting hole. The third insulating rubber layer is arranged between the extension ring and the cover plate, and the inner edge of the third insulating rubber layer extends out of the inner edge of the mounting hole, and the outer edge of the third insulating rubber layer extends out of the outer edge of the extension ring.

10. A button cell according to claim 1, characterized in that, 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 pole position and is electrically connected to the pole; 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.

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