Rechargeable button battery

Abstract

The present invention discloses a rechargeable button battery, comprising a negative electrode cover, a positive electrode shell, a conductive needle and a wound battery cell. The negative electrode cover has a bottom opening, and the top of the negative electrode cover has a collector cup protruding downward. The positive electrode shell has a top opening, and the positive electrode shell and the negative electrode cover form a receiving cavity. The conductive needle is configured to be inserted into the collector cup. The wound battery cell is located in the receiving cavity, and the middle part of the wound battery cell has a channel extending along the axial direction of the rechargeable button battery, and the collector cup and the conductive needle are both located in the channel. The wound battery cell includes a negative electrode ear, and an insulating layer is provided between the negative electrode ear and the positive electrode shell, and the negative electrode ear is electrically connected to the conductive needle, thereby being electrically connected to the negative electrode cover via the collector cup. According to the rechargeable button battery of the present invention, the positive electrode ear and the negative electrode ear are arranged on the same side, which is conducive to monitoring the conditions of the two types of ears at the same time, and the side without the ear can be placed on the table, which can avoid damage to the ear; and the assembly is simple and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a rechargeable button battery. Background Art

[0002] With the miniaturization of electrical appliances and electronic products (such as Bluetooth headsets, hearing aids, and electronic watches), the market demand for small-sized, high-energy-density lithium-ion batteries is increasing. Micro-rechargeable button batteries have the characteristics of wide operating temperature, recyclability, long storage time, and stable discharge voltage, which can meet the above market needs. And with the development of 5G technology, the promotion of wearable devices and IOT (Internet of Things) application products, it can be foreseen that micro-rechargeable button batteries will have broader prospects in the future.

[0003] However, when producing such batteries, the positive and negative tabs of the battery are respectively arranged at both ends, for example, the positive tab and the positive electrode shell are welded on one side, and the negative tab and the negative electrode shell are welded on the other side. Due to the limitation of welding space, this method is very difficult to weld, the battery assembly process is complicated, and the assembly efficiency is low. It is also easy to cause damage to the tab on the side placed on the table.

[0004] Therefore, a rechargeable button battery is needed to at least partially solve the above problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a rechargeable button battery, comprising:

[0007] A negative electrode cover, wherein the negative electrode cover has a bottom opening and a top of the negative electrode cover has a collector cup protruding downward;

[0008] A positive electrode shell, wherein the positive electrode shell has a top opening, and the positive electrode shell and the negative electrode cover form a receiving cavity;

[0009] a conductive pin configured to be inserted into the collector cup; and

[0010] A wound battery cell, wherein the wound battery cell is located in the accommodating cavity, wherein a channel extending along the axial direction of the rechargeable button battery is provided in the middle portion of the wound battery cell, wherein the collector cup and the conductive needle are both located in the channel, wherein the wound battery cell comprises a negative electrode tab, wherein an insulating layer is provided between the negative electrode tab and the positive electrode shell, and wherein the negative electrode tab is electrically connected to the conductive needle, thereby being electrically connected to the negative electrode cover via the collector cup.

[0011] According to the rechargeable button battery of the present invention, the positive electrode tab and the negative electrode tab are arranged on the same side, which is conducive to monitoring the conditions of the two types of tabs at the same time during production, and the side without the tab can be placed on the table to avoid damage to the tab; it is also easy to weld, and the assembly is simple and efficient.

[0012] Furthermore, the rechargeable button battery also includes a current collector, which is located at the bottom end of the channel and connected to the negative electrode tab, and the bottom end of the conductive needle is welded to the current collector.

[0013] Furthermore, the wound battery cell further comprises a positive electrode tab, the positive electrode tab is electrically connected to the positive electrode shell, and the positive electrode tab and the negative electrode tab are both arranged close to the positive electrode shell.

[0014] Furthermore, the positive electrode shell includes a shell bottom and a shell wall extending upward from the periphery of the shell bottom, the negative electrode cover includes a cover top and a cover wall extending downward from the periphery of the cover top, the cover wall is located on the inner side of the shell wall, and the rechargeable button battery also includes a sealing ring, which includes a sealing portion located between the shell wall and the cover wall and a bent portion bent inward around the bottom end of the cover wall.

[0015] Furthermore, the positive electrode tab is at least partially disposed between the shell wall and the sealing portion.

[0016] Furthermore, a recessed portion recessed radially inwardly of the rechargeable button battery is provided on the shell wall, and the positive electrode tab abuts against the recessed portion.

[0017] Furthermore, the rechargeable button battery further includes a tie wire, and the tie wire is wound from the outside of the rechargeable button battery to the recessed portion.

[0018] Further, the middle and lower parts of the conductive needle are cylindrical, and the top of the conductive needle is truncated cone.

[0019] Furthermore, the collector cup has a cylindrical slot in the middle, the diameter of the slot is not greater than the diameter of the middle and lower parts of the conductive needle, and when the conductive needle is inserted into the slot, the truncated cone-shaped top of the conductive needle abuts against the collector cup.

[0020] Furthermore, the collector cup is elastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0022] Figure 1 A schematic front view of a rechargeable button battery according to a preferred embodiment of the present invention;

[0023] Figure 2 A schematic cross-sectional view of a rechargeable button battery according to a preferred embodiment of the present invention; and

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of part A.

[0025] Description of reference numerals:

[0026] 100: Rechargeable button battery 110: Positive electrode shell

[0027] 111: Shell wall 112: Shell bottom

[0028] 113: Depression 120: Negative electrode cover

[0029] 121: Cover wall 122: Cover top

[0030] 130: wound battery cell 131: positive electrode sheet

[0031] 132: Negative electrode 133: Channel

[0032] 140: Negative electrode tab 150: Positive electrode tab

[0033] 160: Collector cup 161: Slot

[0034] 170: Conductive needle 180: Current collector

[0035] 190: Sealing ring 191: Sealing part

[0036] 192: Bending part DETAILED DESCRIPTION

[0037] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0038] In order to fully understand the present invention, a detailed description will be provided in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0040] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0041] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art.

[0042] Please refer to Figure 1 and Figure 2 A rechargeable button battery 100 according to a preferred embodiment of the present invention comprises a positive electrode shell 110, a negative electrode cover 120, a conductive pin 170 and a wound battery cell 130. The positive electrode shell 110 and the negative electrode cover 120 are preferably made of metal material, for example, 304 or 316L stainless steel material.

[0043] Specifically, the negative electrode cover 120 includes a cover top 122 and a cover wall 121 extending downward from the periphery of the cover top 122, the cover wall 121 is located on the inner side of the shell wall 111, and the cover wall 121 surrounds a bottom opening. The top of the negative electrode cover 120, i.e., the cover top 122, has a collector cup 160 protruding toward the bottom opening, and the collector cup 160 is preferably connected to the negative electrode cover 120 by welding.

[0044] The positive electrode case 110 includes a case bottom 112 and a case wall 111 extending upward from the periphery of the case bottom 112, and the case wall 111 surrounds a top opening. The negative electrode cover 120 is inserted into the positive electrode case 110 in a direction from the bottom opening to the top opening, and the positive electrode case 110 and the negative electrode cover 120 surround a receiving cavity. The wound battery cell 130 and the electrolyte are arranged in the receiving cavity.

[0045] The wound battery cell 130 includes a positive electrode sheet 131, a negative electrode sheet 132, and a separator separating the positive electrode sheet 131 and the negative electrode sheet 132, and the three can be wound into an approximate cylinder. From the inside to the outside, they can be a separator, a negative electrode sheet 132, a separator, a positive electrode sheet 131, a separator, and so on. It is easy to understand that the position of the negative electrode sheet 132 and the positive electrode sheet 131 can be opposite. The positive electrode sheet 131 and the negative electrode sheet 132 are coated with a positive active material and a negative active material, respectively. In order to obtain a higher energy density, the positive active material preferably adopts a lithium cobalt oxide material.

[0046] The wound cell 130 further includes a negative electrode tab 140 and a positive electrode tab 150. The negative electrode tab 140 and the positive electrode tab 150 extend from the negative electrode sheet 132 and the positive electrode sheet 131 respectively toward the same side along the axial direction of the rechargeable button battery 100. Preferably, the negative electrode tab 140 and the positive electrode tab 150 both extend toward the positive electrode shell 110 and are arranged close to the positive electrode shell 110. An insulating layer (not shown) is provided between the negative electrode tab 140 and the positive electrode shell 110, and the insulating layer can be pre-set on the shell bottom 112 to prevent the negative electrode tab 140 from short-circuiting with the positive electrode shell.

[0047] The middle of the wound cell 130 has a channel 133 extending along the axial direction of the rechargeable button battery 100 , and the collector cup 160 and the conductive needle 170 are both located in the channel 133 . The conductive needle 170 is configured to be inserted into the collector cup 160 , and is located above the negative electrode tab 140 .

[0048] The positive electrode tab 150 is electrically connected to the positive electrode case 110. The negative electrode tab 140 is electrically connected to the conductive pin 170. For example, the negative electrode tab 140 and the bottom of the conductive pin 170 can be connected by riveting or welding. The top of the conductive pin 170 is inserted into the collector cup 160 to be electrically connected to the collector cup 160, so that the negative electrode tab 140 can be electrically connected to the negative electrode cover 120 via the conductive pin 170 and the collector cup 160 in sequence.

[0049] In order to improve the conductivity, the collector cup 160 and the conductive needle 170 can be preferably made of copper. The middle and lower parts of the conductive needle 170 can be constructed as a cylinder, and the top can be constructed as a truncated cone. The middle part of the collector cup 160 has a cylindrical slot 161, and the diameter of the slot 161 is not greater than the diameter of the middle and lower parts of the conductive needle 170. When the conductive needle 170 is inserted into the slot 161, the truncated cone-shaped top of the conductive needle 170 abuts against the collector cup 160. The collector cup 160 is elastic, thereby utilizing the elasticity of the collector cup 160 and the truncated cone-shaped top of the conductive needle 170 to achieve elastic snap connection, and the assembly is simple and easy to implement.

[0050] According to the rechargeable button battery 100 of the present invention, the positive electrode tab 150 and the negative electrode tab 140 are arranged on the same side, which is conducive to monitoring the conditions of the two types of tabs at the same time during production, and the side without the tab can be placed on the table to avoid damage to the tab. It is also easy to weld, simple to assemble and efficient.

[0051] Please refer to the following Figure 2 The rechargeable button battery 100 further includes a current collector 180 to reduce internal resistance. The current collector 180 is located at the bottom end of the channel 133 and connected to the negative electrode tab 140, and the bottom end of the conductive needle 170 is welded to the current collector 180. Thus, the negative electrode tab 140 is electrically connected to the negative electrode cap 120 via the current collector 180, the conductive needle 170 and the collector cup 160 in sequence.

[0052] In order to prevent leakage of electrolyte, the rechargeable button battery 100 further includes a sealing ring 190 for sealing the gap between the shell wall 111 and the cover wall 121. The sealing ring 190 includes a sealing portion 191 located between the shell wall 111 and the cover wall 121 and a bent portion 192 bent inwardly around the bottom end of the cover wall 121. That is, the sealing ring 190 extends inwardly from the bottom of the cover wall 121 along the radial direction of the rechargeable button battery 100 and bends upward to the radial inner side of the cover wall 121. The sealing ring 190 is preferably made of plastic material, such as modified polypropylene. The size of the sealing ring 190 is preferably 0.01mm to 0.02mm, such as 0.012mm. The small-sized sealing ring 190 can make room for the battery cell and the electrolyte, and increase the capacity of the rechargeable button battery 100 by about 3%-8%. In addition, the sealing ring 190 and the positive electrode case 110 need to be coated with sealant separately to enhance the sealing effect.

[0053] Please refer to the following Figure 3The positive electrode tab 150 is at least partially disposed between the shell wall 111 and the sealing portion 191. That is, the positive electrode tab 150 extends outward from the bottom of the sealing ring 190 along the radial direction of the rechargeable button battery 100 and bends upward to the radial outer side of the sealing ring 190. In addition to increasing the contact surface and contact tightness between the positive electrode tab 150 and the positive electrode shell 110 to reduce the internal resistance, such a configuration can also eliminate the welding process between the positive electrode tab 150 and the positive electrode shell 110.

[0054] In order to make the positive electrode tab 150 more closely contact with the positive electrode shell 110, a recessed portion 113 is provided on the shell wall 111, which is recessed inwardly along the radial direction of the rechargeable button battery 100, and the positive electrode tab 150 abuts against the recessed portion 113. Preferably, the positive electrode tab 150 extends beyond the recessed portion 113. This solution can also limit the height of the rechargeable button battery 100 and prevent the negative electrode cover 120 from bouncing up after assembly.

[0055] Preferably, a tie wire may be provided at the recessed portion 113 , and the tie wire is wound from the outside of the rechargeable button battery 100 to the recessed portion 113 to tie up the positive electrode case 110 .

[0056] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0057] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rechargeable button battery, characterized in that: The rechargeable button battery comprises: A negative electrode cover, wherein the negative electrode cover has a bottom opening, a top of the negative electrode cover has a collector cup protruding downward, the collector cup is elastic, and a cylindrical slot is provided in the middle of the collector cup; A positive electrode shell, wherein the positive electrode shell has a top opening, and the positive electrode shell and the negative electrode cover form a receiving cavity; A conductive pin, the conductive pin being configured to be inserted into the collector cup, the middle and lower parts of the conductive pin being configured to be cylindrical, the top of the conductive pin being configured to be truncated cone-shaped, the diameter of the slot being no greater than the diameters of the middle and lower parts of the conductive pin, and the truncated cone-shaped top of the conductive pin abutting against the collector cup when the conductive pin is inserted into the slot; and A wound battery cell, wherein the wound battery cell is located in the accommodating cavity, wherein the middle portion of the wound battery cell has a channel extending along the axial direction of the rechargeable button battery, wherein the collector cup and the conductive needle are both located in the channel, wherein the wound battery cell comprises a negative electrode tab and a positive electrode tab, wherein an insulating layer is provided between the negative electrode tab and the positive electrode shell, wherein the negative electrode tab is electrically connected to the conductive needle and thus electrically connected to the negative electrode cover via the collector cup, wherein the positive electrode tab is electrically connected to the positive electrode shell, and wherein the positive electrode tab and the negative electrode tab are arranged on the same side.

2. The rechargeable button battery according to claim 1, characterized in that: The rechargeable button battery further includes a current collector, which is located at the bottom end of the channel and connected to the negative electrode tab, and the bottom end of the conductive needle is welded to the current collector.

3. The rechargeable button battery according to claim 1, characterized in that: The positive electrode shell includes a shell bottom and a shell wall extending upward from the periphery of the shell bottom, the negative electrode cover includes a cover top and a cover wall extending downward from the periphery of the cover top, the cover wall is located on the inner side of the shell wall, and the rechargeable button battery also includes a sealing ring, the sealing ring includes a sealing portion located between the shell wall and the cover wall and a bent portion bent inward around the bottom end of the cover wall.

4. The rechargeable button battery according to claim 3, characterized in that: The positive electrode tab is at least partially disposed between the shell wall and the sealing portion.

5. The rechargeable button battery according to claim 4, characterized in that: The shell wall is provided with a recessed portion which is recessed inwardly along the radial direction of the rechargeable button battery, and the positive electrode tab is in contact with the recessed portion.

6. The rechargeable button battery according to claim 5, characterized in that: The rechargeable button battery further includes a tie wire that is wound from the outside of the rechargeable button battery to the recessed portion.

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