Button-type lithium-ion battery and preparation method thereof

Abstract

A button-type lithium-ion battery and a preparation method thereof, the button-type lithium-ion battery comprising: a battery bottom cup, a sealing assembly, a battery top cover shell and a battery cell assembly, wherein a receiving cavity is arranged in the battery bottom cup; the sealing assembly comprises a sealing ring, the battery top cover shell is arranged in the sealing ring, and the battery cell assembly comprises a battery cell and an electrolyte. The button-type lithium-ion battery of the present invention is provided with a battery bottom cup, a sealing assembly, a battery top cover shell and a battery cell assembly, so that the cylindrical battery top cover shell is sealed by the battery bottom cup and the sealing ring. In this way, the pitting and necking processes in the traditional processing operation can be eliminated, and the cylindrical battery top cover shell can improve the overall structural strength, so that during the sealing operation, only the cup mouth and the sealing ring of the battery bottom cup need to be bent and deformed, thereby ensuring that the internal space of the battery top cover shell will not change, thereby making the space of the internal battery cell unchanged, so that the capacity of the button battery is higher.

Description

Technical Field

[0001] The invention relates to the field of lithium ion battery manufacturing, and in particular to a button-type lithium ion battery and a preparation method thereof. Background Art

[0002] A button cell is a chamber structure composed of a metal bottom shell and a top shell. The bottom shell is usually connected to the positive electrode, while the top shell is usually connected to the negative electrode. There is a plastic rubber ring (usually polypropylene) between the bottom shell and the top shell. The rubber ring has both sealing and insulating functions. When sealing, the edge of the bottom shell is squeezed inward by mechanical force and wrapped with the top shell to form a closed shell. Usually, the shell of a button cell is a "sandwich" structure battery cell composed of a single layer of positive electrode sheet, diaphragm paper and negative electrode sheet. The battery cell is placed horizontally parallel to the upper and lower bottom surfaces of the shell. The capacity of the button cell prepared by this method is very limited. Traditionally, before the button cell is sealed, it must go through the pitting process. The part above the pitting position is used to store the top cover rubber ring, which occupies the space of the battery cell. After the battery is sealed, it must be patted. The height difference of patting will also compress the space to accommodate the battery cell. At the same time, there is also the problem that the width of the electrode sheet is too narrow and cannot be produced due to insufficient internal space.

[0003] Exception: cylindrical batteries use metal shells, which can avoid changes in external dimensions caused by gas production inside the battery to a certain extent compared to polymer soft-pack batteries. However, the top assembly of cylindrical batteries requires a certain amount of space, and there is a design limit in the height direction. Therefore, how to improve the structure and production process of button batteries to improve the space utilization of button batteries and simplify the production process is a problem that researchers in this field need to solve. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a button-type lithium-ion battery and a preparation method thereof which can improve the structural strength of the button battery and simplify the production process.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A button-type lithium-ion battery, comprising:

[0007] A battery bottom cup, wherein a receiving cavity is provided in the battery bottom cup;

[0008] A sealing assembly, wherein the sealing assembly comprises a sealing ring, the sealing ring is arranged in the accommodating cavity, and the sealing ring is in contact with the inner cavity wall of the accommodating cavity, and a positioning convex ring is arranged at the bottom of the sealing ring, and the positioning convex ring abuts against the bottom of the accommodating cavity;

[0009] A battery top cover shell, wherein the battery top cover shell is disposed in the sealing ring, and the battery top cover shell is in contact with the inner wall of the sealing ring;

[0010] The opening end of the battery bottom cup is provided with an edge folding portion, and when the edge folding portion is folded, the opening of the sealing ring is folded and attached to the top of the battery top cover shell; and

[0011] A battery cell assembly, the battery cell assembly includes a battery cell and an electrolyte, the battery cell and the electrolyte are respectively arranged in the accommodating cavity, and the battery cell is respectively electrically connected to the battery bottom cup and the battery top cover shell.

[0012] In one embodiment, the battery cell assembly further includes a positive conductive sheet and a negative conductive sheet, wherein the positive conductive sheet is connected to the positive electrode of the battery cell, and the negative conductive sheet is connected to the negative electrode of the battery cell.

[0013] In one embodiment, the positive electrode conductive sheet is connected to the battery top cover shell, and the negative electrode conductive sheet is connected to the battery bottom cup.

[0014] In one embodiment, the battery cell is a cylindrical battery cell.

[0015] In one embodiment, the battery cell is a laminated battery cell.

[0016] In one embodiment, a connecting boss is disposed on the top of the battery top cover shell.

[0017] In one embodiment, the top of the battery cover shell is a planar structure.

[0018] In one embodiment, the sealing ring is a sealing rubber ring.

[0019] In one embodiment, the battery top cover shell is a cylindrical structure.

[0020] A method for preparing the above-mentioned button-type lithium-ion battery comprises the following steps:

[0021] (1) preparing a battery bottom cup, a sealing ring and a battery top cover shell, pushing the sealing ring downward into the receiving cavity of the battery bottom cup, and making the sealing ring fit the inner wall of the receiving cavity;

[0022] (2) preparing a battery cell, and placing the battery cell into the battery bottom cup or placing the battery cell into the battery top cover shell;

[0023] (3) Place the battery top cover shell into the battery bottom cup;

[0024] (4) Fix the battery bottom cup with a clamp, and squeeze the cup mouth of the battery bottom cup with a mold so that the cup mouth and the sealing ring are bent and deformed and fastened to the battery top cover shell.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] The button-type lithium-ion battery 10 of the present invention is provided with a battery bottom cup 100, a sealing assembly 200, a battery top cover shell 300 and a battery cell assembly 400, so that the cylindrical battery top cover shell 300 is sealed by the battery bottom cup 100 and the sealing ring 210. In this way, the pitting and necking processes in the traditional processing operation can be eliminated, and the cylindrical battery top cover shell 300 can improve the overall structural strength, so that during the sealing operation, only the cup mouth of the battery bottom cup 100 and the sealing ring 210 need to be bent and deformed, thereby ensuring that the internal space of the battery top cover shell 300 will not change, thereby ensuring that the space of the internal battery cell will not change, thereby making the capacity of the button battery higher; at the same time, it also avoids the problem that the electrode width is too narrow and cannot be produced due to insufficient internal space. The preparation method of the button-type lithium-ion battery of the present invention directly fixes the battery bottom cup, the sealing ring and the battery top cover shell together, and the sealing ring is sleeved in the battery bottom cup, and the battery top cover shell is sleeved in the sealing ring, and the bottom edge of the battery top cover shell is used to compress the sealing ring to achieve a sealing effect. This process omits the processes of pitting and necking, increases the space for the battery cell, so that more battery capacity can be designed, and also avoids the problem that the electrode width is too narrow and cannot be produced due to insufficient internal space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic structural diagram of a button-type lithium-ion battery according to one embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a button-type lithium-ion battery according to another embodiment of the present invention;

[0030] Figure 3 It is a schematic structural diagram of a battery top cover shell according to one embodiment of the present invention;

[0031] Figure 4 It is a schematic structural diagram of a battery top cover shell according to another embodiment of the present invention;

[0032] Figure 5 It is a schematic structural diagram of a battery top cover shell according to another embodiment of the present invention;

[0033] Figure 6 It is a structural schematic diagram of a sealing assembly according to one embodiment of the present invention;

[0034] Figure 7 It is a schematic structural diagram of a sealing assembly according to another embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] It should be noted that the expressions used herein regarding an element being “connected” to another element also mean that an element is “communicated” to another element, and fluids can be exchanged and communicated between the two elements.

[0039] In one embodiment, a button-type lithium-ion battery comprises: a battery bottom cup, a sealing assembly, a battery top cover shell and a battery cell assembly, wherein the battery bottom cup is provided with a receiving cavity; the sealing assembly comprises a sealing ring, the sealing ring is provided in the receiving cavity, and the sealing ring is in contact with the inner cavity wall of the receiving cavity, and a positioning convex ring is provided at the bottom of the sealing ring, and the positioning convex ring abuts against the bottom of the receiving cavity; the battery top cover shell is provided in the sealing ring, and the battery top cover shell is in contact with the inner ring wall of the sealing ring, and the battery A snap-fitting convex ring is provided at the bottom of the top cover shell, and a snap-fitting groove is provided on the inner wall of the sealing ring close to the positioning convex ring, and the snap-fitting convex ring is snapped into the snap-fitting groove; a rim folding portion is provided at the open end of the battery bottom cup, and when the rim folding portion is folded, it is used to fold the opening of the sealing ring and press it to the top of the battery top cover shell; the battery cell assembly includes a battery cell and an electrolyte, the battery cell and the electrolyte are respectively arranged in the accommodating cavity, and the battery cell is electrically connected to the battery bottom cup and the battery top cover shell respectively. The button-type lithium-ion battery of the present invention is provided with a battery bottom cup, a sealing assembly, a battery top cover shell and a battery cell assembly, so that the cylindrical battery top cover shell is sealed by the battery bottom cup and the sealing ring. In this way, the pitting and necking processes in the traditional processing operation can be eliminated, and the cylindrical battery top cover shell can improve the overall structural strength, so that during the sealing operation, only the cup mouth of the battery bottom cup and the sealing ring need to be bent and deformed, thereby ensuring that the internal space of the battery top cover shell does not change, thereby ensuring that the space of the internal battery cell does not change, so that the capacity of the button battery is higher; at the same time, it also avoids the problem that the electrode width is too narrow and cannot be produced due to insufficient internal space.

[0040] In order to better explain the above button-type lithium-ion battery and better understand the concept of the above button-type lithium-ion battery. Figure 1 A button-type lithium-ion battery 10 includes: a battery bottom cup 100, a sealing assembly 200, a battery top cover shell 300 and a battery cell assembly 400. The battery bottom cup 100 is provided with a receiving cavity 110. The sealing assembly 200 includes a sealing ring 210. The sealing ring 210 is provided in the receiving cavity 110, and the sealing ring 210 is in contact with the inner cavity wall of the receiving cavity 110. A positioning convex ring 211 is provided at the bottom of the sealing ring 210, and the positioning convex ring 211 abuts against the bottom of the receiving cavity 110. In this embodiment, the battery bottom cup 100 is a stainless steel bottom cup, the sealing ring is a rubber ring, and the sealing ring is a cylindrical structure.

[0041] It should be noted that the battery bottom cup 100 can be a metal bottom cup such as a stainless steel bottom cup, an electroplated steel shell or an aluminum shell, or a bottom cup structure made of other metals. The battery bottom cup 100 is a cylindrical structure with an open end, wherein a accommodating cavity 110 is arranged inside the battery bottom cup 100, and the accommodating cavity 110 is used to store battery cells and fill electrolyte; a positioning convex ring 211 is arranged at the bottom of the sealing ring 210. When the sealing ring 210 is placed in the accommodating cavity 110 of the battery bottom cup 100 manually or by corresponding manipulator equipment, the sealing ring 210 is abutted against the bottom of the accommodating cavity 110 through the positioning convex ring 211 at the bottom. In this way, the sealing ring 210 can be quickly and accurately installed in the battery bottom cup 100, and the overall installation accuracy can be improved, so that the overall structural strength is strengthened. When the sealing ring is installed, the elastic force of the sealing ring enables the sealing ring to fit tightly to the inner wall of the accommodating cavity 110. In this way, the overall structure can be more compact and the space utilization of the accommodating cavity 110 can be improved, thereby increasing the battery capacity.

[0042] Please refer again Figure 1 The battery top cover 300 is disposed in the sealing ring 210, and the battery top cover 300 is in contact with the inner wall of the sealing ring 210. A snap-fitting protrusion 310 is disposed at the bottom of the battery top cover 300. A snap-fitting groove 220 is disposed on the inner wall of the sealing ring near the positioning protrusion 211, and the snap-fitting protrusion 310 is snap-fitted into the snap-fitting groove 220. In this embodiment, the battery top cover 300 is a cylindrical structure.

[0043] like Figure 3 As shown, it is a structural diagram of a battery top cover shell 300 according to an embodiment of the present invention. The material of the battery top cover shell 300 can be nickel, aluminum, a composite material or other metals. The snap-fitting protrusion 310 located at the bottom of the battery top cover shell 300 protrudes outward. When placed in the sealing ring 210, the snap-fitting protrusion 310 is seated on the positioning protrusion 211 of the sealing ring 210, and can be snap-fitted and fixed with the snap-fitting groove 220 of the sealing ring through the snap-fitting protrusion 310, so that the overall structure can be made more compact and firm, thereby improving the overall stability of the battery.

[0044] like Figure 4 As shown, it is a structural diagram of a battery top cover shell 300a according to another embodiment of the present invention. The material of the battery top cover shell 300a can be nickel, aluminum, a composite material or other metals. The snap-fitting protrusion 310a at the bottom of the battery top cover shell 300a protrudes inward. When placed in the sealing ring 210, the snap-fitting protrusion 310a is seated on the positioning protrusion 211 of the sealing ring 210, and the snap-fitting protrusion 310a is abutted against the positioning protrusion 211. In this way, the overall structure can be improved during the sealing process, and the installation accuracy can be improved.

[0045] like Figure 5 As shown, it is a structural diagram of a battery top cover shell 300b of another embodiment of the present invention. The material of the battery top cover shell 300b can be nickel, aluminum, composite materials or other metals. The inner and outer side walls of the top cover shell bottom 310b of the battery top cover shell 300b are both flat structures without protruding structures. In this way, the battery top cover shell 300b can be easier to insert into the sealing ring 210, making the battery production and processing operations more convenient.

[0046] like Figure 6 As shown, it is a structural diagram of a sealing ring 210 according to an embodiment of the present invention. A positioning protruding ring 211 is provided at the bottom of the sealing ring 210. When the sealing ring 210 is placed in the accommodating cavity 110 of the battery bottom cup 100 manually or by a corresponding manipulator, the sealing ring 210 is held against the bottom of the accommodating cavity 110 by the positioning protruding ring 211 at the bottom. In this way, the sealing ring 210 can be quickly and accurately installed in the battery bottom cup 100, and the overall installation accuracy can be improved, so that the overall structural strength is strengthened. A snap-fitting groove 220 is provided on the inner wall of the sealing ring near the positioning protruding ring 211. The sealing ring 210 in this embodiment is used to snap-fit ​​with the snap-fitting protruding ring 310 protruding outwardly provided at the bottom of the battery top cover shell 300. In this way, the snap-fitting protruding ring 310 can be snap-fitted and fixed with the snap-fitting groove 220 of the sealing ring, so that the overall structure can be made more compact and firm, thereby improving the overall stability of the battery.

[0047] like Figure 7 , which is a structural diagram of a sealing ring 210a according to another embodiment of the present invention, wherein a positioning convex ring 211a is provided at the bottom of the sealing ring 210. When the sealing ring 210a is placed in the accommodating cavity 110 of the battery bottom cup 100 manually or by a corresponding manipulator, the sealing ring 210a is held against the bottom of the accommodating cavity 110 by the positioning convex ring 211a at the bottom, so that the sealing ring 210a can be quickly and accurately installed in the battery bottom cup 100, and the overall installation accuracy can be improved, so that the overall structural strength is strengthened. In this embodiment, the inner wall of the sealing ring 210a is a flat structure without a snap-fit ​​groove. This structure is used for installation and matching with a battery top cover shell having a snap-fit ​​convex ring protruding inwardly or without a snap-fit ​​convex ring at the bottom of the battery top cover shell, thereby simplifying the production process of the sealing ring 210a and saving production costs. Furthermore, a folding portion 120 is provided at the open end of the battery bottom cup 100 . When the folding portion 120 is folded, the opening of the sealing ring 210 is folded and pressed against the top of the battery top cover shell 300 .

[0048] It should be noted that the battery top cover shell 300 is a cylindrical shell structure. Compared with the sheet-shaped battery cover in the prior art, the battery top cover shell 300 with a cylindrical shell structure can improve the overall structural strength of the battery, thereby avoiding compression of the internal space of the battery bottom cup 100 during the battery sealing process, thereby ensuring that the internal space and capacity of the battery remain constant, thereby improving the production quality of the battery. When the battery top cover shell 300 is inserted and placed in the accommodating cavity 110, the battery top cover shell 300 is abutted against the positioning convex ring 211 of the sealing ring 210 through the snap-fit ​​convex ring 310. In this way, the installation accuracy of the battery top cover shell 300 can be improved, so that the overall installation and processing efficiency is improved. At the same time, the battery top cover shell 300 is snap-fitted and fixed with the snap-fit ​​groove 220 of the sealing ring 210 through the snap-fit ​​convex ring 310, so that the battery top cover shell 300 can be installed and fixed in the accommodating cavity 110. In this way, the strength of the overall structure can be improved to prevent the internal components from shaking or being damaged when the battery is dropped or bumped. After the battery top cover shell 300 is installed and fixed, the sealing ring 210 can be squeezed by the installation force, so that the battery top cover shell 300 and the inner ring wall of the sealing ring 210 are tightly fitted together. In this way, the internal space of the accommodating cavity 110 can be fully utilized, thereby ensuring that the internal space and capacity of the battery remain constant, so that the production quality of the battery is improved. After the battery top cover 300 is installed, the folded edge portion 120 at the open end of the battery bottom cup 100 is sealed and squeezed by mechanical pressure, so that the folded edge portion 120 is folded toward the battery top cover 300, so that the opening of the sealing ring 210 is folded and pressed against the top of the battery top cover 300. In this way, the sealing ring 210 at the top of the battery top cover 300 will be compressed and sealed to the battery top cover 300, thereby playing a sealing role and preventing the leakage of the electrolyte inside the battery, thereby achieving a double protection effect. In this embodiment, the battery top cover 300 can be made of a nickel-aluminum composite material or other metal materials.

[0049] Please refer again Figure 1 The battery cell assembly 400 includes a battery cell 410 and an electrolyte. The battery cell 410 and the electrolyte are respectively disposed in the accommodating cavity 110 , and the battery cell 410 is electrically connected to the battery bottom cup 100 and the battery top cover shell 300 , respectively.

[0050] Furthermore, the battery cell assembly 400 further includes a positive conductive sheet 420 and a negative conductive sheet 430, wherein the positive conductive sheet 420 is connected to the positive electrode of the battery cell, and the negative conductive sheet 430 is connected to the negative electrode of the battery cell. The positive conductive sheet 420 is also connected to the battery top cover 300, and the negative conductive sheet 430 is also connected to the battery bottom cup 100, thereby realizing the electrical connection operation between the battery cell and the battery bottom cup 100 and the battery top cover 300.

[0051] It should be noted that the battery cell 410 and the electrolyte are respectively arranged in the accommodating cavity 110, and the battery cell 410 is connected to the battery top cover shell 300 through the positive conductive sheet 420, and the battery cell 410 is connected to the battery bottom cup 100 through the negative conductive sheet 430, thereby realizing the electrical connection operation between the battery cell and the battery bottom cup 100 and the battery top cover shell 300.

[0052] like Figure 2 As shown, it is a structural diagram of a button-type lithium-ion battery 20 according to another embodiment of the present invention. The battery cell of the button-type lithium-ion battery 20 is a cylindrical battery cell 400a. Specifically, the cylindrical battery cell 400a includes a positive electrode sheet, a separator and a negative electrode sheet. The cylindrical battery cell is formed by sequentially placing the positive electrode sheet, the separator and the negative electrode sheet on a winding machine, and winding the cylindrical battery cell by the winding machine, wherein the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the outermost layer of the cylindrical wound battery cell is the separator.

[0053] In another embodiment, the battery cell is a laminated battery cell, for details, please refer to Figure 1 The laminated battery cell is made by stacking the negative electrode sheet, the separator paper and the positive electrode sheet in several layers in sequence, with the separator paper placed between the positive electrode sheet and the negative electrode sheet, and the separator paper is placed on the top and bottom surfaces to obtain a laminated battery cell.

[0054] In one embodiment, a connecting boss 320 is provided on the top of the battery top cover shell 300, so that an electrical connection with external components can be achieved through the connecting boss 320; for another example, the top of the battery top cover shell is a planar structure, so that the overall structure can be more compact and the overall structural strength can be improved.

[0055] The button-type lithium-ion battery 10 of the present invention is provided with a battery bottom cup 100, a sealing assembly 200, a battery top cover shell 300 and a battery cell assembly 400, so that the cylindrical battery top cover shell 300 is sealed by the battery bottom cup 100 and the sealing ring 210. In this way, the pitting and necking processes in the traditional processing operation can be eliminated, and the cylindrical battery top cover shell 300 can improve the overall structural strength, so that during the sealing operation, only the cup mouth of the battery bottom cup 100 and the sealing ring 210 need to be bent and deformed, thereby ensuring that the internal space of the battery top cover shell 300 will not change, thereby ensuring that the space of the internal battery cell will not change, thereby making the capacity of the button battery higher; at the same time, it also avoids the problem that the electrode width is too narrow and cannot be produced due to insufficient internal space.

[0056] A method for preparing a button-type lithium-ion battery comprises the following steps:

[0057] (1) preparing a battery bottom cup, a sealing ring and a battery top cover shell, pushing the sealing ring downward into the receiving cavity of the battery bottom cup, and making the sealing ring fit the inner wall of the receiving cavity;

[0058] Among them, a positioning convex ring 211 is set at the bottom of the sealing ring 210. One end of the sealing ring 210 with the positioning convex ring 211 is placed flat on the cup mouth of the battery bottom cup, and then the sealing ring 210 is pushed into the accommodating cavity 110 of the battery bottom cup, so that the positioning convex ring 211 is abutted against the bottom of the accommodating cavity 110, thereby completing the installation operation of the sealing ring.

[0059] (2) preparing a battery cell, and placing the battery cell into the battery bottom cup or placing the battery cell into the battery top cover shell;

[0060] The battery cell may be a cylindrical battery cell or a laminated battery cell; the preparation process of the cylindrical battery cell comprises the following steps:

[0061] 1. Place the positive electrode sheet, separator paper and negative electrode sheet on the winding machine in sequence and wind them into a winding core;

[0062] 2. The diaphragm is placed between the positive electrode sheet and the negative electrode sheet, and the outermost layer of the winding core is the diaphragm, thus obtaining a cylindrical battery cell.

[0063] The preparation process of the laminated battery core comprises the following steps:

[0064] 1. Stack the negative electrode sheet, separator paper and positive electrode sheet in several layers in sequence, with the separator paper placed between the positive electrode sheet and the negative electrode sheet, and separator paper placed on the top and bottom surfaces to obtain a stacked battery cell.

[0065] It should be noted that after the preparation of the cylindrical battery cell or the laminated battery cell is completed, the prepared battery cell is placed in the battery bottom cup or the prepared battery cell is placed in the battery top cover shell, thereby completing the battery cell installation and placement operation. If the battery cell is placed in the battery bottom cup, the specific steps include: bending a pole piece on the battery cell close to the battery bottom cup inward, and then placing the entire battery cell in a bottom cup provided with an insulating bottom meson and a sealing ring, and then welding the guide piece of one pole piece to the battery top cover shell, and the guide piece of the other pole piece to the bottom of the battery bottom cup. At the same time, the top and bottom ends of the battery cell are respectively provided with an insulating top meson and an insulating bottom meson, thereby playing an insulating protection role. If the battery cell is placed in the battery top cover shell, first put the entire battery cell into the battery top cover shell, and weld the guide piece of one pole close to the battery top cover shell to the battery top cover shell, and then weld the guide piece of the other pole to the bottom of the battery bottom cup. In this embodiment, the welding method of the positive and negative electrode conductors of the battery cell can be performed in the following manner: the positive electrode conductor is welded to the battery top cover shell, and the negative electrode conductor is connected to the battery bottom cup 100 .

[0066] (3) placing the battery top cover shell into the battery bottom cup; the operation of placing the battery top cover shell into the battery bottom cup also includes the following steps:

[0067] The electrolyte filling operation is to add the electrolyte into the accommodating cavity of the battery bottom cup. If the battery cell is placed in the battery bottom cup first at this time, then after adding the electrolyte, the battery top cover shell needs to be kept away from the battery cell, and then put into the sealing rubber ring. In this way, the collision between the battery top cover shell and the battery cell can be avoided. If the battery cell is placed in the battery top cover shell first at this time, then after adding the electrolyte, the battery bottom cup is inverted and put on the battery top cover shell. In this way, the amount of electrolyte added each time can be guaranteed to be more accurate.

[0068] (4) Sealing operation: fix the battery bottom cup with a clamp, and squeeze the cup mouth of the battery bottom cup with a mold so that the cup mouth and the sealing ring are bent and deformed and fastened to the battery top cover shell.

[0069] It should be noted that during the sealing operation, the bottom of the battery top cover shell is subjected to pressure, which will compress and deform the positioning protruding ring 211 located at the bottom of the battery bottom cup, so that the battery top cover shell is in full contact with the battery bottom cup. At the same time, the positioning protruding ring 211 plays a buffering and pressure-resistant role, which can prevent the battery top cover shell from deforming under pressure, thereby ensuring that the internal space remains constant; by using the extrusion of the sealing mold, the cup mouth of the battery bottom cup is folded toward the direction of the battery top cover shell, so that the sealing rubber ring at the cup mouth is pressed against the top of the battery top cover shell, thereby completing the battery sealing operation.

[0070] Compared with the prior art, the present invention has at least the following advantages:

[0071] The button-type lithium-ion battery 10 of the present invention is provided with a battery bottom cup 100, a sealing assembly 200, a battery top cover shell 300 and a battery cell assembly 400, so that the cylindrical battery top cover shell 300 is sealed by the battery bottom cup 100 and the sealing ring 210. In this way, the pitting and necking processes in the traditional processing operation can be eliminated, and the cylindrical battery top cover shell 300 can improve the overall structural strength, so that during the sealing operation, only the cup mouth of the battery bottom cup 100 and the sealing ring 210 need to be bent and deformed, thereby ensuring that the internal space of the battery top cover shell 300 will not change, thereby ensuring that the space of the internal battery cell will not change, thereby making the capacity of the button battery higher; at the same time, it also avoids the problem that the electrode width is too narrow and cannot be produced due to insufficient internal space. The preparation method of the button-type lithium-ion battery of the present invention directly fixes the battery bottom cup, the sealing ring and the battery top cover shell together, and the sealing ring is sleeved in the battery bottom cup, and the battery top cover shell is sleeved in the sealing ring, and the bottom edge of the battery top cover shell is used to compress the sealing ring to achieve a sealing effect. This process omits the processes of pitting and necking, increases the space for the battery cell, so that more battery capacity can be designed, and also avoids the problem that the electrode width is too narrow and cannot be produced due to insufficient internal space.

[0072] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A button-type lithium-ion battery, characterized in that: include: A battery bottom cup, wherein a receiving cavity is provided in the battery bottom cup; A sealing assembly, wherein the sealing assembly comprises a sealing ring, the sealing ring is arranged in the accommodating cavity, and the sealing ring is in contact with the inner cavity wall of the accommodating cavity, and a positioning convex ring is arranged at the bottom of the sealing ring, and the positioning convex ring abuts against the bottom of the accommodating cavity; A battery top cover shell, the battery top cover shell is arranged in the sealing ring, and the battery top cover shell is in contact with the inner ring wall of the sealing ring; a snap-fitting convex ring is arranged at the bottom of the battery top cover shell, a snap-fitting groove is arranged on the inner wall of the sealing ring close to the positioning convex ring, and the snap-fitting convex ring is snap-fitted in the snap-fitting groove; the snap-fitting convex ring protrudes outward, and when the battery top cover shell is placed in the sealing ring, the snap-fitting convex ring is located on the positioning convex ring of the sealing ring, so that the snap-fitting convex ring is snap-fitted and fixed with the snap-fitting groove of the sealing ring; The opening end of the battery bottom cup is provided with an edge folding portion, and when the edge folding portion is folded, the opening of the sealing ring is folded and attached to the top of the battery top cover shell; and A battery cell assembly, the battery cell assembly includes a battery cell and an electrolyte, the battery cell and the electrolyte are respectively arranged in the accommodating cavity, and the battery cell is respectively electrically connected to the battery bottom cup and the battery top cover shell.

2. The button-type lithium-ion battery according to claim 1, characterized in that: The battery cell assembly further includes a positive conductive sheet and a negative conductive sheet, wherein the positive conductive sheet is connected to the positive electrode of the battery cell, and the negative conductive sheet is connected to the negative electrode of the battery cell.

3. The button-type lithium-ion battery according to claim 2, characterized in that: The positive electrode conductive sheet is connected to the battery top cover shell, and the negative electrode conductive sheet is connected to the battery bottom cup.

4. The button-type lithium-ion battery according to claim 1, characterized in that: The battery core is a cylindrical battery core.

5. The button-type lithium-ion battery according to claim 1, characterized in that: The battery core is a laminated battery core.

6. The button-type lithium-ion battery according to claim 1, characterized in that: A connecting boss is arranged on the top of the battery top cover shell.

7. The button-type lithium-ion battery according to claim 1, characterized in that: The top of the battery top cover shell is a planar structure.

8. The button-type lithium-ion battery according to claim 1, characterized in that: The sealing ring is a sealing rubber ring.

9. The button-type lithium-ion battery according to claim 1, characterized in that: The battery top cover shell is a cylindrical structure.

10. A method for preparing a button-type lithium-ion battery according to any one of claims 1 to 9, characterized in that: It includes the following steps: (1) preparing a battery bottom cup, a sealing ring and a battery top cover shell, pushing the sealing ring downward into the receiving cavity of the battery bottom cup, and making the sealing ring fit the inner wall of the receiving cavity; (2) preparing a battery cell, and placing the battery cell into the battery bottom cup or placing the battery cell into the battery top cover shell; (3) Place the battery top cover shell into the battery bottom cup; (4) Fix the battery bottom cup with a clamp, and squeeze the cup mouth of the battery bottom cup with a mold so that the cup mouth and the sealing ring are bent and deformed and fastened to the battery top cover shell.

Images