阅读说明：本技术 扣式电池的制备方法 (Button cell preparation method ) 是由 许德胜 王永旺 曾玉祥 陈龙云 于 2020-08-31 设计创作，主要内容包括：本发明提供一种扣式电池的制备方法,涉及扣式电池制备技术领域。扣式电池的制备方法包括提供壳体、卷绕电芯、第一极耳和毛细管；将卷绕电芯和第一极耳放置于壳体内,且使得第一极耳与壳底接触；确定卷绕电芯的中心孔的位置；将毛细管插入卷绕电芯的中心孔内,以将第一极耳压紧在壳底上；将第一极耳和壳底焊接在一起。本发明的扣式电池的制备方法用于制备扣式电池,扣式电池的制备安全性提高,制备的扣式电池的质量和性能满足要求。(The invention provides a preparation method of a button cell, and relates to the technical field of button cell preparation. The preparation method of the button cell comprises the steps of providing a shell, a winding cell, a first tab and a capillary tube; placing the winding battery cell and a first tab in a shell, and enabling the first tab to be in contact with the shell bottom; determining the position of a central hole of a winding battery core; inserting a capillary tube into a central hole of the winding battery core to tightly press a first tab on the shell bottom; and welding the first tab and the shell bottom together. The preparation method of the button cell is used for preparing the button cell, the preparation safety of the button cell is improved, and the quality and the performance of the prepared button cell meet the requirements.)

1. A method for preparing a button cell is characterized by comprising the following steps:

providing a shell, a winding battery cell, a first tab and a capillary tube, wherein the shell comprises a shell bottom and a shell wall extending upwards from the periphery of the shell bottom, the winding battery cell is provided with a central hole, and the first tab is connected with one of a negative pole piece and a positive pole piece of the winding battery cell;

placing the wound cell and a first tab within the casing, and contacting the first tab with the casing bottom;

determining the position of a central hole of the winding battery core;

inserting the capillary tube into a central hole of the wound cell to compress the first tab against the casing bottom;

and welding the first tab and the shell bottom together.

2. The button cell battery preparation method according to claim 1, wherein the determining the position of the central hole of the winding cell specifically comprises:

imaging the winding battery cell to obtain graphic data;

and carrying out data processing on the graphic data to determine the position of the central hole of the winding battery core.

3. The method for preparing a button cell according to claim 1, wherein after the welding the first tab and the case bottom together, the method further comprises:

providing a cover plate assembly, wherein the cover plate assembly comprises a cover, a top cover and a sealing element, an inner hole is formed in the cover, a liquid injection port coaxial with the inner hole is formed in the top cover, the aperture of the liquid injection port is smaller than or equal to that of the inner hole, the outer diameter of the cover is larger than that of the top cover, and the top cover and the cover are in insulation sealing overlapping connection through the sealing element;

and welding the periphery of the shell wall and the outer periphery of the shell cover.

4. The method for preparing button cell battery according to claim 3, wherein after the welding the peripheral edge of the shell wall and the peripheral edge of the shell cover, the method further comprises:

providing a sealing nail;

and sealing the liquid injection port on the top cover by using the sealing nail.

5. The method for preparing button cell battery according to claim 3, wherein before welding the peripheral edge of the shell wall and the peripheral edge of the shell cover, the method further comprises:

providing a second tab, wherein the second tab is connected with the other one of the negative pole piece and the positive pole piece of the winding battery cell, and the polarity of the second tab is opposite to that of the first tab;

and welding the second tab and the top cover together.

6. The button cell battery preparation method according to any one of claims 1-5, wherein after the determining the position of the central hole of the wound cell and before the inserting the capillary tube into the central hole of the wound cell, the method further comprises:

and correcting the position of the winding battery cell according to the position of the central hole of the winding battery cell.

7. The method for preparing button cell battery according to any of claims 1-5, wherein the first tab and the case bottom are welded together, specifically:

use laser welding equipment will welding together at the bottom of first utmost point ear and the shell, wherein, first utmost point ear deviates from the welding area at the bottom of the shell has the seal of welding, deviate from at the bottom of the shell the welding area of first utmost point ear is the smooth surface, perhaps, first utmost point ear deviates from the welding area at the bottom of the shell and deviate from at the bottom of the shell the welding area of first utmost point ear all has the seal of welding.

8. The method for preparing button cell batteries according to claim 7, wherein the shape of the solder print is dot-shaped or linear.

9. The method for preparing button cell batteries according to claim 8, wherein the number of the solder prints is greater than or equal to two.

10. The method for preparing button cell batteries according to claim 8, wherein the distance between the solder stamp and the inner wall of the capillary is greater than zero.

Technical Field

The invention relates to the technical field of button cell preparation, in particular to a button cell preparation method.

Background

Button cells, also called button cells, are cells that are similar in size to a small button, generally having a large diameter and a small thickness. Button cell is along with the development and the progress of science and technology, and the wide application is on wearable equipment, for example on electronic product such as wireless earphone, motion wrist-watch, bracelet, ring.

The existing button cell comprises a shell, a cover plate assembly and a winding cell, wherein the winding cell is accommodated in an accommodating cavity surrounded by the shell and the cover plate assembly, a positive pole piece of the winding cell is connected with a positive pole lug, and a negative pole piece of the winding cell is connected with a negative pole lug so as to supply power to the outside.

In the existing button cell preparation process, a negative electrode tab and a shell are generally welded together in a resistance welding manner. However, when the negative electrode tab and the case are welded by resistance welding, when there is a gap between the negative electrode tab and the case, there is a risk of fire explosion during welding.

Disclosure of Invention

In view of the above problems, the invention provides a button cell preparation method to solve the problem of fire explosion risk during resistance welding.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

the embodiment of the invention provides a preparation method of a button cell, which comprises the following steps:

providing a shell, a winding battery cell, a first tab and a capillary, wherein the shell comprises a shell bottom and a shell wall extending upwards from the periphery of the shell bottom, the winding battery cell is provided with a central hole, and the first tab is connected with one of a negative pole piece and a positive pole piece of the winding battery cell;

placing the winding battery cell and a first tab in a shell, and enabling the first tab to be in contact with the shell bottom;

determining the position of a central hole of a winding battery core;

inserting a capillary tube into a central hole of the winding battery core to tightly press a first tab on the shell bottom;

and welding the first tab and the shell bottom together.

Compared with the prior art, the preparation method of the button cell provided by the invention has the following advantages:

in the preparation method of the button cell provided by the embodiment of the invention, the capillary tube is inserted into the central hole of the winding battery core, and the first tab is tightly pressed on the shell bottom by utilizing the capillary tube, so that the probability of fire explosion during welding is effectively reduced when the capillary tube and the first tab are welded together, the preparation safety of the button cell is further improved, and the quality and the performance of the prepared button cell meet the requirements. In addition, the side wall of the capillary tube can also protect the hole wall of the central hole of the winding battery cell, so that the damage of a welding tool to the winding battery cell during welding is effectively reduced, and the quality and the performance of the prepared button cell can meet the requirements.

In some possible embodiments, determining the position of the central hole of the wound battery cell specifically includes:

imaging the winding battery cell to obtain graphic data;

and carrying out data processing on the graphic data to determine the position of the central hole of the winding battery core.

In some possible embodiments, after welding the first tab and the case bottom together, the method further includes:

providing a cover plate assembly, wherein the cover plate assembly comprises a cover, a top cover and a sealing piece, an inner hole is formed in the cover, a liquid injection port coaxial with the inner hole is formed in the top cover, the aperture of the liquid injection port is smaller than or equal to that of the inner hole, the outer diameter of the cover is larger than that of the top cover, and the top cover and the cover are in insulation sealing overlapping connection through the sealing piece;

and welding the periphery of the shell wall and the outer periphery of the shell cover.

In some possible embodiments, after welding the periphery of the housing wall and the periphery of the housing cover, the method further includes:

providing a sealing nail;

and sealing the liquid injection port on the top cover by adopting a sealing nail.

In some possible embodiments, before welding the periphery of the housing wall and the periphery of the housing cover, the method further includes:

providing a second tab, wherein the second tab is connected with the other one of the negative pole piece and the positive pole piece of the winding battery cell, and the polarity of the second tab is opposite to that of the first tab;

and welding the second tab and the top cover together.

In some possible embodiments, after determining the position of the central hole of the wound cell and before inserting the capillary tube into the central hole of the wound cell, the method further comprises:

and correcting the position of the winding battery cell according to the position of the central hole of the winding battery cell.

In some possible embodiments, the first tab and the case bottom are welded together, specifically:

and welding the first lug and the shell together by using laser welding equipment, wherein the welding area of the first lug departing from the shell has a welding mark, the welding area of the first lug departing from the shell is a smooth surface, or the welding area of the first lug departing from the shell and the welding area of the first lug departing from the shell all have welding marks.

In some possible embodiments, the shape of the solder mark is a dot or a line.

In some possible embodiments, the number of solder marks is equal to or greater than two.

In some possible embodiments, the distance of the solder mark from the inner wall of the capillary is greater than zero.

In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions, other technical problems solved by the method for manufacturing a button cell according to the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flow chart of a method for manufacturing a button cell of the present embodiment;

fig. 2 is a schematic diagram illustrating connection of a winding cell, a negative electrode tab and a positive electrode tab in this embodiment;

fig. 3 is a schematic mounting diagram of the wound battery cell, the negative electrode tab and the positive electrode tab in fig. 2 when mounted into the casing;

FIG. 4 is a cross-sectional view of the capillary and wound cell assembly;

FIG. 5 is a schematic structural diagram of a CCD camera during imaging processing;

fig. 6 is a schematic image of the wound cell and the negative electrode tab obtained after the imaging process of fig. 5;

fig. 7 is a schematic structural diagram of a winding cell and a casing placed on a platform;

FIG. 8 is a schematic diagram of the transfer mechanism for transferring the capillary tube;

fig. 9 is a schematic structural view before a hole ironing process is performed on a wound cell;

fig. 10 is a schematic structural diagram of the wound cell shown in fig. 9 after the hole punching process;

fig. 11 is a schematic structural diagram of a wound cell after hot press shaping treatment;

fig. 12 is a schematic structural diagram of the wound cell shown in fig. 11 before a hole ironing process is performed;

fig. 13 is a first schematic structural view of the wound cell mounted in the casing after the cell pasting process;

fig. 14 is a cross-sectional view of the wound cell of fig. 13 disposed in a casing;

fig. 15 is a second structural diagram of the wound cell mounted in the casing after the cell is rubberized;

FIG. 16 is a schematic view of the welded case and negative electrode tab;

FIG. 17 is a schematic structural view of the positive electrode tab and the case cover during welding;

fig. 18 is a cross-sectional view of a button cell prepared in this example.

Description of reference numerals:

100: a housing; 101: a shell bottom;

102: a shell wall; 200: winding the battery cell;

201: a central bore; 202: a positive electrode plate;

203: a first diaphragm; 204: a negative pole piece;

205: a second diaphragm; 300: a first tab;

301: a first stage; 302: a second stage;

400: a capillary tube; 500: a platform;

501: a laser; 502: a laser beam;

503: a transfer mechanism; 504: a CCD camera;

600: a separator layer; 700: gummed paper;

800: a second tab; 900: a shell cover;

901: a liquid injection port; 902: sealing nails;

903: a top cover; 904: an inner bore.

Detailed Description

In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Existing button cells typically include a housing, a cover plate assembly, a wound cell, a negative tab, and a positive tab. The shell comprises a shell bottom and a shell wall extending upwards from the periphery of the shell bottom, the shell bottom and the shell wall enclose a containing cavity with an opening at the top, and the cover plate assembly covers the opening of the containing cavity. The containing cavity is internally provided with a winding battery cell and electrolyte, the winding battery cell at least comprises a positive pole piece, a negative pole piece and a diaphragm for separating the positive pole piece and the negative pole piece, the negative pole piece is connected with a negative pole lug, and the positive pole piece is connected with the positive pole lug. The existing button cell also needs to connect a negative pole tab with the shell and a positive pole tab with the cover plate component. The negative electrode tab and the shell are connected together by resistance welding.

However, when the negative electrode tab and the shell are welded together by resistance welding, when a gap exists between the negative electrode tab and the shell, the risk of fire explosion exists in the resistance welding, moreover, the welding effect of the resistance welding is not good, the welding pin is easy to wear, in actual use, the welding pin needs to be replaced about two thousand times, the replacement frequency of the welding pin is high, the welding efficiency is low, and the button cell is not suitable for large-scale high-efficiency preparation.

In order to solve the problems that when welding a negative pole lug and a shell by resistance welding, explosion easily occurs, the welding effect is poor, a welding needle is easily worn, the replacement frequency of the welding needle is high, and the welding efficiency is low, the application provides a preparation method of the button cell.

The method for manufacturing a button cell provided by the invention is described in detail below with reference to specific embodiments. The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

The embodiment of the invention provides a preparation method of a button cell, as shown in fig. 1, the method comprises the following steps:

providing a housing 100, a wound cell 200, a first tab 300 and a capillary tube 400; wherein, the casing 100 comprises a casing bottom 101 and a casing wall 102 extending upwards from the periphery of the casing bottom 101; as shown in fig. 2, the wound cell 200 has a central aperture 201, and a first tab 300 is coupled to one of the negative pole piece 204 and the positive pole piece 202 of the wound cell 200, for example, in some embodiments, the first tab 300 is coupled to the negative pole piece 204 of the wound cell 200, and the first tab 300 constitutes a negative pole tab;

placing the wound battery cell 200 and the first tab 300 in the casing 100, and enabling the first tab 300 to be in contact with the casing bottom 101; wherein, the winding battery cell 200 and the first tab 300 are placed in the casing 100 along the positive direction x as shown in fig. 3;

determining the position of the central hole 201 of the wound battery cell 200;

inserting the capillary 400 into the central hole 201 of the wound cell 200 to press the first tab 300 against the case bottom 101; the wall thickness of the capillary tube may be, for example, 0.05 to 1mm, and the diameter of the central hole 201 of the winding core 200 may be, for example, 1 to 3 mm; a cross-sectional view of the capillary 400 inserted into the wound cell 200 is shown in fig. 4;

the first tab 300 and the case bottom 101 are welded together.

In the preparation method of the button cell provided by the embodiment of the invention, the capillary 400 is inserted into the central hole 201 of the winding battery cell 200, and then the capillary 400 is utilized to compress the first tab 300 on the shell bottom 101, so that when the capillary 400 and the first tab 300 are welded together, the probability of fire explosion during welding is effectively reduced, the preparation safety of the button cell is further improved, and the quality and the performance of the prepared button cell meet the requirements. In addition, the side wall of the capillary 400 can also protect the hole wall of the central hole 201 of the winding battery cell 200, so that the damage of a welding tool to the winding battery cell 200 during welding is effectively reduced, and the quality and performance of the prepared button cell battery can meet the requirements.

In some possible embodiments, determining the position of the central hole 201 of the winding electric core 200 specifically includes:

imaging the winding battery cell 200 to obtain graphic data;

and processing the graphic data to determine the position of the central hole 201 of the winding battery cell 200.

In this embodiment, for example, the CCD camera 504 shown in fig. 5 may be used to perform the imaging process, where the CCD is a charge coupled device (charge coupled device) for short, and is capable of converting light into charges, storing and transferring the charges, and taking out the stored charges to change the voltage, thereby facilitating the data processing of the graphic data. The image resulting from the imaging process is shown in fig. 6. It should be noted that, when the imaging processing is performed on the winding battery cell 200 and the position of the central hole 201 of the winding battery cell 200 is further confirmed, whether the first tab 300 is effectively exposed in the central hole 201 can be confirmed through data processing, so that the welding quality of the first tab 300 and the case bottom 101 can be improved, the welding failure of the first tab 300 and the case bottom 101 is avoided, and the quality of the prepared button cell is better.

In some possible embodiments, the data processing is performed on the graphic data to determine the position of the central hole 201 of the winding electric core 200, and specifically includes:

extracting a gray value of the graphic data, determining a position of the first tab 300 in the central hole 201 in the image according to the gray value, and determining the position of the first tab 300 as the position of the central hole 201 of the winding battery cell 200.

In this embodiment, the material of the first tab 300 may be, for example, copper, and the first tab 300 reflects light more easily than the winding battery cell 200, so in the obtained graphic data, the gray value of the graphic data corresponding to the first tab 300 is different from the gray value of the graphic data corresponding to the winding battery cell 200, so that the position of the first tab 300 may be obtained by processing the gray value of the graphic data, and the position of the central hole 201 of the winding battery cell 200 may be determined.

The method for preparing a button cell battery provided in this embodiment further includes, before performing imaging processing on the winding electric core 200:

and performing light supplement operation on the winding battery cell 200.

Obviously, the light supplementing operation can make the obtained image data clearer, and further accurately determine the position of the central hole 201 of the winding battery cell 200.

The method for manufacturing a button cell provided in this embodiment, after welding the first tab 300 and the case bottom 101 together, further includes:

providing a cover plate component, wherein the cover plate component comprises a shell cover 900, a top cover 903 and a sealing element, an inner hole 904 is formed in the shell cover 900, a liquid injection port 901 is formed in the top cover 903, the hole diameter of the liquid injection port 901 is smaller than or equal to that of the inner hole 904, the outer diameter of the shell cover 900 is larger than that of the top cover 903, and the top cover 903 and the shell cover 900 are connected together in an insulating and sealing mode through the sealing element;

the periphery of the wall 102 and the outer periphery of the cover 900 are welded.

It is worth to be noted that, in the method for manufacturing a button cell of this embodiment, the first tab 300 and the case bottom 101 are welded together, and then the outer periphery of the case cover 900 and the periphery of the case wall 102 are welded together, so that it can be effectively avoided that the position of the central hole 201 cannot be confirmed due to the small aperture of the liquid injection port 901 on the top cover 903, and further the capillary 400 and the welding high temperature damage the wound electrical core 200. In other words, compared with the method of welding the outer periphery of the case cover 900 and the periphery of the case wall 102 together, and finally welding the first tab 300 and the case bottom 101 together by using the liquid injection port 901 and the central hole 201, damage to the wound battery cell 200 can be effectively avoided, because the hole diameter of the liquid injection port 901 is smaller than that of the central hole 201, which not only results in failure to effectively confirm the position of the central hole 201 coaxial with the liquid injection port 901 and further results in failure to accurately and automatically insert the capillary 400 into the central hole 201 in the following process, but also fails to ensure that the welding tool automatically and accurately welds the first tab 300 and the case bottom 101 together, even if the position of the central hole 201 can be confirmed, the hole diameter of the liquid injection port 901 is too small, and also results in a smaller hole diameter of the capillary 400, and further results in failure to weld the first tab 300 and the case bottom 101 together through the capillary 400 by a welding tool such as a welding needle for resistance, or a laser, which is disadvantageous to, for example, laser welding, welds the first tab 300 and the case bottom 101 together through the capillary 400. In summary, according to the method for manufacturing the button cell of the embodiment, since the position of the central hole 201 is confirmed to be more accurate and the aperture of the capillary 400 is larger, the welding of the first tab 300 and the case bottom 101 is facilitated, and the quality of the manufactured button cell is better.

In the method for manufacturing a button cell provided in this embodiment, after welding the peripheral edge of the housing wall 102 and the outer peripheral edge of the housing cover 900, the method further includes:

providing a seal pin 902;

the pouring port 901 in the top lid 903 is sealed with a seal nail 902.

In order to ensure effective charging and discharging of the prepared button cell, electrolyte needs to be placed in the accommodating cavity of the shell, the electrolyte can enter the accommodating cavity through the liquid injection port 901 in the top cover 903, and the liquid injection port 901 in the top cover 903 is sealed through the sealing nail 902, so that the electrolyte can be effectively prevented from flowing out of the accommodating cavity, and the prepared button cell can be ensured to work effectively.

Of course, in some other embodiments, the electrolyte injection port 901 may not be provided, and the electrolyte injection port 901 does not need to be sealed by the sealing nail 902, but the electrolyte is directly injected from the top opening of the casing after the first tab 300 and the casing bottom 101 are welded together and before the outer periphery of the casing cover 900 and the periphery of the casing wall 102 are welded together, so that the preparation process can be simplified and the preparation efficiency can be improved.

In the method for manufacturing a button cell provided in this embodiment, before welding the peripheral edge of the housing wall 102 and the outer peripheral edge of the housing cover 900, the method further includes:

providing a second tab 800, the second tab 800 being connected to the other of the negative pole piece 204 and the positive pole piece 202 of the wound cell 200, the second tab 800 being opposite in polarity to the first tab 800, e.g., in some embodiments, the first tab 300 is connected to the negative pole piece 204 of the wound cell 200, the first tab 300 constitutes a negative pole tab, the second tab 800 is connected to the positive pole piece 202 of the wound cell 200, and the second tab 800 constitutes a positive pole tab; before providing the second tab 800, the second tab 800 needs to be cut, so that the size of the second tab 800 meets the requirement;

the second tab 800 is welded to the top cover 903 by laser welding, resistance welding or the like, and a welding area 801 where the second tab 800 is welded to the top cover 903 is located radially outside the central hole 201 as shown in fig. 17.

By welding the second tab 800 and the top cover 903 together, one of the negative electrode tab 204 and the positive electrode tab 202 of the winding battery cell 200 can be connected to the top cover 903, and further the case bottom 101 is matched to supply power to the outside.

After determining the position of the central hole 201 of the wound battery cell 200 and before inserting the capillary 400 into the central hole 201 of the wound battery cell 200, the method for preparing a button cell provided in this embodiment further includes:

and performing deviation rectification processing on the position of the winding battery cell 200 according to the position of the central hole 201 of the winding battery cell 200.

In this embodiment, after the position of the central hole 201 of the wound battery cell 200 is determined, the wound battery cell 200, the casing 100 and the first tab 300 may be moved by using the platform 500 shown in fig. 7, so that the position of the central hole 201 of the wound battery cell 200 is a predetermined fixed position, which is convenient for subsequently moving the transfer mechanism 503 of the capillary 400 (shown in fig. 8) by using a fixed path to accurately insert the capillary 400 into the central hole 201 of the wound battery cell 200, and the central hole 201 of the wound battery cell 200 is not damaged, thereby improving the quality of the prepared button cell.

In the method for manufacturing a button cell provided in this embodiment, the first tab 300 and the case bottom 101 are welded together, specifically:

the first tab 300 and the case bottom 101 are welded together by using a laser welding device, wherein the welding area of the first tab 300 facing away from the case bottom 101 has a weld mark, and the welding area of the case bottom 101 facing away from the first tab 300 is a smooth surface, or the welding area of the first tab 300 facing away from the case bottom 101 and the welding area of the case bottom 101 facing away from the first tab 300 both have weld marks.

The laser welding apparatus uses, for example, a laser 501 as shown in fig. 7, and a laser beam 502 emitted by the laser 501 passes through the capillary 400 (as shown in fig. 8) and strikes the first tab 300, thereby welding the first section 301 of the first tab 300 and the case bottom 101 together. Fig. 16 shows a welding effect of the first tab 300 and the case bottom 101 after welding.

Further, the shape of the welding mark is in a dot shape or a line shape, and the shape of the welding mark is specifically selected according to the aperture of the central hole 201 of the winding battery cell 200 and the size of the first tab 300, for example, when the aperture of the central hole 201 of the winding battery cell 200 and the size of the first tab 300 are large, the welding mark formed by welding can be in a line shape, and when the aperture of the central hole 201 of the winding battery cell 200 and the size of the first tab 300 are small, the welding mark formed by welding can be in a dot shape, so as to adapt to the preparation of button batteries with different sizes. The number of the welding marks is greater than or equal to two, so that the first tab 300 and the shell bottom 101 are reliably welded together. In addition, the distance between the welding mark and the inner wall of the capillary 400 is greater than zero, so that when the first tab 300 and the shell bottom 101 are welded, the capillary 400 is not damaged, that is, the winding battery cell 200 is kept intact when the first tab 300 and the shell bottom 101 are welded, and the quality of the prepared button cell meets the requirement.

In the method for manufacturing the button cell provided by this embodiment, in the button cell manufactured by this embodiment, the welding area of the first tab 300 away from the case bottom 101 has the welding mark, and the welding area of the case bottom 101 away from the first tab 300 is a smooth surface, or both the welding area of the first tab 300 away from the case bottom 101 and the welding area of the case bottom 101 away from the first tab 300 have the welding mark, and these two welding effects are determined by the parameters of laser welding and the material and size of the first tab 300, so that both the first tab 300 and the case bottom 101 can be reliably connected.

Before providing the casing 100, the winding core 200, the first tab 300, and the capillary 400, the method for manufacturing a button cell according to this embodiment further includes:

providing a positive pole piece 202, a first separator 203, a negative pole piece 204, and a second separator 205, wherein the circumferential edges of the first separator 203 and the second separator 205 exceed the positive pole piece 202 and the negative pole tab;

stacking the positive pole piece 202, the first diaphragm 203, the negative pole piece 204 and the second diaphragm 205 in sequence to form a battery cell sheet;

rolling the cell sheet into a wound cell 200, wherein, as shown in fig. 9, a first diaphragm 203 and a second diaphragm 205 are present at a central hole 201 of the wound cell 200, and after the rolling is completed, tail portions of the positive pole piece 202, the first diaphragm 203, the negative pole piece 204 and the second diaphragm 205 are adhered to a side wall of the wound cell 200 by using a tail adhesive;

a hole ironing process is performed on the central hole 201 of the wound battery cell 200 to remove the first diaphragm 203 and the second diaphragm 205 in the central hole 201 of the wound battery cell 200, and a schematic structural diagram of the wound battery cell 200 after the hole ironing process is shown in fig. 10.

In this embodiment, a hole ironing process is adopted to remove the first diaphragm 203 and the second diaphragm 205 in the central hole 201 of the wound battery cell 200, so that the central hole 201 of the wound battery cell 200 is a substantially regular circular hole, and it is convenient to subsequently insert the capillary 400 into the central hole 201 of the wound battery cell 200, and when the capillary 400 is inserted into the central hole 201 of the wound battery cell 200, the probability of damage to the positive pole piece 202, the first diaphragm 203, the negative pole piece 204, and the second diaphragm 205 of the wound battery cell 200 by the capillary 400 is reduced, especially the probability of damage to the first diaphragm 203 and the second diaphragm 205 is reduced.

Before providing the casing 100, the winding core 200, the first tab 300, and the capillary 400, the method for manufacturing a button cell according to this embodiment further includes: the following steps are performed after the hot hole processing is performed on the center hole 201 of the wound battery cell 200:

the first separator 203 and the second separator 205 are subjected to a hot press forming process, wherein the forming temperature of the hot press forming process is, for example, in the range of 80 ° to 200 °, and a separator layer 600 is formed at both axial ends of the wound electric core 200 after the hot press forming process, as shown in fig. 11.

It should be noted that after the wound battery cell 200 is formed, the first separator 203 and the second separator 205 usually exceed the positive electrode tab 202 and the negative electrode tab 204, as shown in fig. 12, to effectively separate the positive electrode tab 202 from the negative electrode tab 204, however, this may cause the height of the wound battery cell 200 to be higher than the height of the casing 100 after the wound battery cell 200 is placed in the casing 100, which may cause the casing cover 900 and the casing 100 to be incompletely folded, which will cause poor welding between the casing cover 900 and the casing 100, and in order to solve the problem that the height of the wound battery cell 200 is higher than the height of the casing 100, which may cause poor welding between the casing cover 900 and the casing 100, in the present embodiment, a hot press shaping process is adopted, such that the heights of the first separator 203 and the second separator 205 meet the requirement of being installed in the casing 100, and the hot press shaping process may further cause the first separator 203 and the negative electrode tab 204 to be tightly attached to the casing 100, the battery is not prone to shaking, so that the positive pole piece 202 and the negative pole piece 204 are not prone to touching the shell 100 and the shell cover 900 to form a short circuit, and safety is further improved.

Before providing the casing 100 and the winding core 200, the method for preparing a button cell provided in this embodiment further includes: the following steps after the hot press shaping of the first and second diaphragms 203 and 205:

rubberizing is performed on two axial ends of the wound battery cell 200, where the rubberizing refers to attaching the gummed paper 700 to the two axial ends of the wound battery cell 200, and the rubberizing can effectively avoid a short circuit between the positive electrode tab 202 and the negative electrode tab 204, and the casing 100 and the casing cover 900, and schematic diagrams of placing the rubberized wound battery cell 200 in the casing 100 are shown in fig. 13 and 15, and a cross-sectional view is shown in fig. 14.

Before providing the casing 100, the winding core 200, the first tab 300, and the capillary 400, the method for manufacturing a button cell according to this embodiment further includes: the following steps are performed after the rubberizing process is performed on the two axial ends of the wound battery cell 200:

the first tab 300 is bent.

The bending process enables the first tab 300 to form a first section 301 and a second section 302, wherein the first section 301 is located at the bottom of the wound battery cell 200, the second section 302 extends towards the top of the wound battery cell 200 along the side wall of the wound battery cell 200, and the first section 301 is attached to the case bottom 101, so that the first section 301 and the case bottom 101 are welded together.

In the method for preparing a button cell of the embodiment of the invention, the cross-sectional view of the prepared button cell is shown in fig. 18, the winding cell 200 of the button cell is located in the accommodating cavity of the casing 100, the casing cover 900 is covered on the top of the casing 100, the top cover 903 is located at the bottom of the casing cover 900 and connected with the casing cover 900, the liquid injection port 901 on the top cover 903 is coaxial with the inner hole 904 of the casing cover 900, and the sealing nail 902 seals the liquid injection port 901. It should be noted that the central hole 201 of the wound electrical core 200 prepared by the method for preparing a button cell of the present embodiment may be filled with an insulating member.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.