CN109065822B

CN109065822B - Button cell

Info

Publication number: CN109065822B
Application number: CN201811100004.1A
Authority: CN
Inventors: 刘秦
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-20
Filing date: 2018-09-20
Publication date: 2024-04-05
Anticipated expiration: 2038-09-20
Also published as: CN109065822A; WO2020056879A1

Abstract

The invention relates to a button cell, comprising: a first pole housing and a second pole housing; the insulating sealing ring is arranged between the first pole shell and the second pole shell, electrically isolates the first pole shell from the second pole shell, and a containing cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; and the battery cell is arranged in the accommodating cavity and comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece and the second pole piece are separated by the diaphragm, the first pole piece, the second pole piece and the diaphragm are laminated or wound to form the battery cell, at least one first output conductor is arranged on the first pole piece, extends out of the battery cell and is electrically connected with the first pole shell after being folded and positioned on the outer side of the circumference of the battery cell, at least one second output conductor is arranged on the second pole piece, extends out of the battery cell and is electrically connected with the inner side wall of the second pole shell after being folded and positioned on the outer side of the circumference of the battery cell. The button cell can realize automatic installation between the cell and the anode and cathode shells.

Description

Button cell

Technical Field

The invention relates to the technical field of batteries, in particular to a button battery.

Background

With the development of portable electronic products and smart wearable electronic products, batteries are required to be more miniaturized. Batteries are required to have as high volumetric and mass specific energies as possible while maintaining a high lifetime.

Under the condition that the internal space of the button cell is limited, the aim is fulfilled, the stability and the tightness of the structure are required to be maintained, and the manufacturing cost is relatively high.

Among them, the mechanical connection and the electronic connection between the core body and the positive and negative electrode cases of the button cell are a troublesome problem in the button cell manufacturing process. The production efficiency of the button cell is restricted, the investment of special equipment is increased, the production cost is high, and the automatic production is not easy to realize.

Disclosure of Invention

Based on the above, it is necessary to provide a button cell capable of realizing automatic installation between a battery cell and a positive and negative electrode case, aiming at the problem of inconvenient installation of the button cell.

A button cell comprising:

a first pole housing and a second pole housing;

the insulating sealing ring is arranged between the first pole shell and the second pole shell, electrically isolates the first pole shell from the second pole shell, and a containing cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; and

The battery cell is arranged in the accommodating cavity and comprises a first pole piece, a second pole piece and a diaphragm, wherein the first pole piece and the second pole piece are separated by the diaphragm, the first pole piece, the second pole piece and the diaphragm are laminated or wound to form the battery cell, at least one first output conductor is arranged on the first pole piece and extends out of the battery cell, the first output conductor is folded and positioned on the outer side of the periphery of the battery cell and electrically connected with the first pole shell, at least one second output conductor is arranged on the second pole piece and extends out of the battery cell, and the second output conductor is folded and positioned on the outer side of the periphery of the battery cell and electrically connected with the second pole shell.

According to the button battery, the first output conductor is folded and positioned on the outer side of the periphery of the battery core and is electrically connected with the first electrode shell, and the second output conductor is folded and positioned on the outer side of the periphery of the battery core and is electrically connected with the second electrode shell, so that the input of special equipment is not required to be increased when the battery core and the positive and negative electrode shells are installed, and the electric connection between the battery core and the positive and negative electrode shells is realized simply and easily. Because the first output conductor is connected with the inner side wall of the first polar shell, and the second output conductor is connected with the inner side wall of the second polar shell, the installation can be easier to operate, and only press fit is needed. The connection mode of the battery core and the electrode shell of the button battery is reliable, automatic production is easy to realize, and the manufacturing cost is reduced.

In one embodiment, the first pole piece, the second pole piece and the diaphragm are wound to form the battery cell, the first output conductor is led out from the first pole piece located at the outermost layer of the battery cell, and the second output conductor is led out from the second pole piece located at the outermost layer of the battery cell. The first output conductor and the first polar shell are electrically connected and arranged, and the second output conductor and the second polar shell are electrically connected and arranged.

In one embodiment, the first polar shell comprises a first bottom wall and a first circumferential side wall arranged on the periphery of the first bottom wall, the first polar shell is sleeved on the first end of the battery core, and the first circumferential side wall is electrically connected with the first output conductor; the second electrode shell comprises a second bottom wall and a second circumferential side wall arranged on the periphery of the second bottom wall, the second electrode shell is sleeved on the second end of the battery cell, and the second circumferential side wall is electrically connected with the second output conductor. The first output conductor is electrically connected with the first pole shell, and the second output conductor is electrically connected with the second pole shell.

In one embodiment, the battery cell further comprises a second positioning ring sleeved on the second end of the battery cell, an inward flanging is arranged on the first end of the second positioning ring, the inward flanging is buckled to a joint between the circumferential outer side of the battery cell and the end face of the second end of the battery cell, and the second end of the second positioning ring is abutted to the circumferential outer side of the battery cell. The arrangement of the inner flanging enables the second positioning ring to be stably sleeved on the battery core, and the stability of the electrical connection between the second output conductor and the second circumferential side wall of the second electrode shell is ensured.

In one embodiment, the battery cell further comprises a second positioning ring sleeved on the second end of the battery cell, and the second output conductor extends out of the battery cell and is folded onto the circumferential outer side of the second positioning ring, so that the second output conductor is abutted between the second positioning ring and the second circumferential side wall. The second output conductor is pressed onto the second circumferential side wall of the second pole housing through the second positioning ring, so that the contact fit between the second output conductor and the second circumferential side wall of the second pole housing is firmer.

In one embodiment, the battery cell further comprises a second positioning ring sleeved on the second end of the battery cell, the second output conductor extends out of the battery cell and is folded to the outer side of the circumference of the battery cell, and the second positioning ring is electrically connected with the second output conductor and the second electrode shell respectively. The inner side wall of the second positioning ring is in close fit with the second output conductor, the outer side wall is in butt joint with the second circumferential side wall of the second pole shell, and the second output conductor and the second circumferential side wall of the second pole shell can be stably and firmly electrically connected.

In one embodiment, the battery cell further comprises a first positioning ring, wherein the first positioning ring is sleeve-shaped, two ends of the first positioning ring are both open, the first positioning ring is sleeved on the first end of the battery cell, and the first output conductor is electrically connected with the first circumferential side wall through the first positioning ring. The first positioning ring can enable the first output conductor to be electrically connected with the first circumferential side wall of the first polar shell more stably.

In one embodiment, the first output conductor extends from the electric core and is folded to the outer side of the electric core in the circumferential direction, and the first positioning ring is sleeved on the electric core and is electrically connected with the first output conductor and the first pole shell respectively. The inner side wall of the first positioning ring is in close fit with the first output conductor, the outer side wall is in butt joint with the first circumferential side wall of the first pole shell, and the first output conductor and the first circumferential side wall of the first pole shell can be stably and firmly electrically connected.

In one embodiment, the first positioning ring is of a porous structure, a turned-out edge is arranged at a first end of the first positioning ring, the first positioning ring is sleeved on the battery cell, the turned-out edge is abutted to the first circumferential side wall, a second end of the first positioning ring is abutted to the first bottom wall, and a cavity is formed between the first positioning ring, the turned-out edge, the first bottom wall and the first circumferential side wall. The first locating ring is electrically connected with the first polar shell through the flanging, electrolyte can be stored in the cavity by utilizing the inner cavity of the battery to a greater extent, and the electrolyte can permeate into the battery core through the first locating ring to help the battery core to generate more electric energy.

In one embodiment, the first pole housing further comprises a first end bead disposed on an end of the first circumferential side wall remote from the first bottom wall, the first end bead being crimped to a junction of a circumferential outer side of the insulating seal ring and an end face of the insulating seal ring remote from the first bottom wall. The insulating sealing ring is more stable and firm.

Drawings

FIG. 1 is a schematic view of an embodiment of a button cell of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a battery cell in the button cell shown in FIG. 1;

FIG. 3 is a schematic view of another embodiment of a battery cell in the button cell shown in FIG. 1;

FIG. 4 is a schematic view of a second pole housing in the button cell of FIG. 1 mated with an insulating seal ring;

FIG. 5 is a schematic structural view of a first embodiment in which a second electrode case and a second output conductor in the button cell shown in FIG. 1 are cooperatively installed;

fig. 6 is a schematic structural diagram of a second embodiment in which a second electrode case and a second output conductor in the button cell shown in fig. 1 are mounted in a matching manner;

fig. 7 is a schematic structural diagram of a third embodiment in which a second electrode case and a second output conductor in the button cell shown in fig. 1 are mounted in a matched manner;

FIG. 8 is a schematic structural view of an embodiment of a second positioning ring in the button cell of FIG. 1;

fig. 9 is a schematic structural view of another embodiment of a second positioning ring in the button cell shown in fig. 1.

In the drawings, the list of components represented by the various numbers is as follows:

10. a button cell; 20. a first pole housing; 21. a first bottom wall; 22. a first circumferential sidewall; 23. a first end bead; 30. a second electrode case; 31. a second bottom wall; 32. a second circumferential sidewall; 40. an insulating seal ring; 50. a receiving chamber; 60. a battery cell; 61. a first pole piece; 62. a second pole piece; 63. a diaphragm; 64. a first output conductor; 65. a second output conductor; 70. a second positioning ring; 71. an inner flanging; 72. a first positioning ring; 73. a flanging; 74. insulating layer, 80, cavity, 90, termination tape.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

Referring to fig. 1, in an embodiment of the present invention, a button cell 10 includes: the battery comprises a first pole shell 20, a second pole shell 30, an insulating sealing ring 40 and a battery cell 60. The insulating seal ring 40 is disposed between the first pole housing 20 and the second pole housing 30, and electrically isolates the first pole housing 20 from the second pole housing 30 through the insulating seal ring 40. A receiving cavity 50 is formed between the first pole housing 20, the second pole housing 30 and the insulating seal ring 40. The battery cell 60 is disposed in the housing cavity 50. The cell 60 includes a first pole piece 61, a second pole piece 62, and a diaphragm 63. The first and second electrode sheets 61 and 62 are spaced apart by a separator 63, and the first and second electrode sheets 61 and 62 and the separator 63 are laminated or wound to form the battery cell 60. The first pole piece 61 is provided with at least one first output conductor 64, and the first output conductor 64 extends out of the battery cell 60 and is folded over to be located on the outer side of the circumference of the battery cell 60 and then electrically connected with the first pole shell 20. The second pole piece 62 is provided with at least one second output conductor 65, and the second output conductor 65 extends out from the battery cell 60 and is electrically connected with the second pole shell 30 after being folded and positioned on the circumferential outer side of the battery cell 60.

According to the button cell 10, the first output conductor 64 is folded and positioned on the outer side of the periphery of the battery cell 60 and then is electrically connected with the first pole shell 20, and the second output conductor 65 is folded and positioned on the outer side of the periphery of the battery cell 60 and then is electrically connected with the second pole shell 30, so that the electric connection between the battery cell 60 and the first pole shell 20 and the second pole shell 30 is realized simply and easily without increasing the investment of special equipment when the battery cell 60 and the first pole shell 20 and the second pole shell 30 are installed. Since the first output conductor 64 is connected to the inner side wall of the first pole housing 20 and the second output conductor 65 is connected to the inner side wall of the second pole housing 30, the mounting operation is easier, and only press fit is needed. The connection mode of the battery core 60 and the pole shell of the button cell 10 is reliable, the automatic production is easy to realize, and the manufacturing cost is reduced.

In an embodiment, the first polar casing 20 includes a first bottom wall 21 and a first circumferential sidewall 22 disposed on an outer periphery of the first bottom wall 21, the first polar casing 20 is sleeved on a first end of the battery cell 60, and the first circumferential sidewall 22 is closely attached to the first output conductor 64 and is electrically connected. The second casing 30 includes a second bottom wall 31 and a second circumferential sidewall 32 disposed on an outer periphery of the second bottom wall 31, the second casing 30 is sleeved on a second end of the battery cell 60, and the second circumferential sidewall 32 is tightly attached to the second output conductor 65 and electrically connected to the second output conductor.

Referring to fig. 2, in one embodiment, the first electrode sheet 61 and the second electrode sheet 62 are separated by a separator 63, and rolled into a battery cell 60. It should be noted that, the battery cell 60 may be wound by a pole piece group having a layer sequence of the first pole piece 61/the diaphragm 63/the second pole piece 62/the diaphragm 63, or may be wound by a pole piece group having a layer sequence of the second pole piece 62/the diaphragm 63/the first pole piece 61/the diaphragm 63. The first output conductor 64 and the second output conductor 65 are both provided with one, and the first output conductor 64 is led out from the first pole piece 61 located at the outermost layer of the battery cell 60, and the second output conductor 65 is led out from the second pole piece 62 located at the outermost layer of the battery cell 60. The electrical connection arrangement of the first output conductor 64 and the first pole housing 20, and the electrical connection arrangement of the second output conductor 65 and the second pole housing 30 may be facilitated. Those skilled in the art may extend the first output conductor 64 and the second output conductor 65 from a position on the end face of the cell 60 as desired, without limitation.

After the first electrode sheet 61 and the second electrode sheet 62 are wound into the battery cell 60 with the separator 63 interposed therebetween, the separator 63 is positioned at the outermost layer, and the battery cell 60 is wound and fastened around the outer side in the circumferential direction by the termination tape 90.

Referring to fig. 3, in another embodiment, a first electrode plate 61 and a second electrode plate 62 are separated by a separator 63 and are stacked to form a battery cell 60. Specifically, the battery cell 60 is formed by stacking three layers of first pole pieces 61, four layers of second pole pieces 62, and a separator 63 provided between the first pole pieces 61, the second pole pieces 62. The first pole piece 61, the second pole piece 62 and the diaphragm 63 are arranged in an oval shape. The end of each layer of the first pole piece 61 extends out of the first connecting end, and the first output conductor 64 is connected with the end of each first connecting end. The second connection ends extend from the end of each layer of second pole piece 62, and the second output conductor 65 is connected to the end of each second connection end. The battery cell 60 is covered by an organic insulating material film by hot sealing.

In the specific embodiment, the first electrode case 20 may be a positive electrode case, and the second electrode case 30 may be a negative electrode case. The first electrode sheet 61 may be a positive electrode sheet, and the second electrode sheet 62 may be a negative electrode sheet. The first output conductor 64 may be a positive output conductor and the second output conductor 65 may be a negative output conductor. The main material of the positive plate is nickel cobalt lithium manganate, and the base material is aluminum foil. The main material of the negative plate is artificial graphite, and the base material is copper foil. The parameters such as the materials, length, width and the like of the positive plate, the negative plate and the diaphragm belong to the prior art and are the technology well known to the person skilled in the art.

Furthermore, the output conductor in the present invention refers to any area of the base metal foil of the pole piece that is not functionally coated. For the positive plate, the output conductor is an exposed aluminum foil. For the negative electrode sheet, the output conductor is an exposed copper foil. The electric connection between the pole piece and the pole shell is not limited to the output conductor, and can be realized by arranging the current collector and the pole shell. Specifically, in order to realize the electrical connection between the pole piece and the pole case, the output conductor is combined with a material, a structural component, or an assembly component capable of being electrically connected to the pole case, which is mechanically, physically, chemically, or the like, and is collectively called a current collector. The output conductor is electrically connected to the pole housing by means of a current collector. In the simplest form, the output conductor itself acts as a current collector.

Referring to fig. 4, in a mating embodiment of the second housing 30 and the insulating seal 40, the second output conductor 65 is preferably electrically connected to the second circumferential sidewall 32. An insulating seal 40 may be injection molded over the open outer edge of the second housing 30 using a suitable engineering plastic such that a substantial portion of the second circumferential side wall 32 is not covered by the plastic. After the second electrode case 30 is sealed by crimping, the conductive area of the second circumferential side wall 32 can be well contacted with and electrically connected to the second output conductor 65 on the basis of ensuring good sealing performance of the button cell 10.

Referring to fig. 5, in the first embodiment in which the second casing 30 and the second output conductor 65 are cooperatively mounted, the second output conductor 65 extends from the battery cell 60 and is folded over and located on the circumferential outer side of the battery cell 60, the second casing 30 is sleeved on the end of the battery cell 60, and the second circumferential side wall 32 is closely attached to and electrically connected with the second output conductor 65. The stable electrical connection between the second output conductor 65 and the second circumferential sidewall 32 is realized, and the matching structure is simpler and easier to implement.

Referring to fig. 6 and 8, in the second embodiment in which the second housing 30 is mounted in cooperation with the second output conductor 65, a second positioning ring 70 is further included. The second positioning ring 70 is sleeved on the second end of the battery cell 60, and the second output conductor 65 is electrically connected with the second circumferential sidewall 32. In a specific operation, the second positioning ring 70 is sleeved on the battery core 60, and the second output conductor 65 is folded and positioned on the circumferential outer side of the second positioning ring 70. The second casing 30 is sleeved on the second positioning ring 70, and makes the second output conductor 65 abut against the second positioning ring 70 and the second circumferential sidewall 32. The second output conductor 65 is pressed onto the second circumferential side wall 32 by the second positioning ring 70, so that the contact fit of the second output conductor 65 with the second circumferential side wall 32 is firmer.

Based on the above embodiment, the second positioning ring 70 may be a chemical corrosion resistant plastic member, which is sleeved on the circumferential outer side of the battery core 60, and presses the second output conductor 65 against the second circumferential side wall 32, so as to realize stable electrical connection between the second output conductor 65 and the second diode housing 30.

Referring to fig. 7, in the third embodiment in which the second pole housing 30 is mounted in cooperation with the second output conductor 65, the modification is made on the basis of the second embodiment described above. Specifically, the second output conductor 65 protrudes from the battery cell 60 and is folded over on the circumferential outer side of the battery cell 60. The second positioning ring 70 is sleeved on the circumferential outer side of the battery cell 60, and compresses the second output conductor 65. The second pole housing 30 is sleeved on the second positioning ring 70. The second positioning ring 70 is electrically connected to the second output conductor 65 and the second diode housing 30, respectively. The inner side wall of the second positioning ring 70 is tightly matched with the second output conductor 65, and the outer side wall is abutted against the second circumferential side wall 32, so that the second output conductor 65 and the second circumferential side wall 32 can be stably and firmly electrically connected.

Specifically, the second positioning ring 70 may be a first metal ring. The thickness of the first metal ring is 0.05 mm-0.25 mm, and the height of the first metal ring does not exceed the height of the conductive area on the inner side wall of the second electrode shell 30. The metal ring is sleeved on one end of the battery core 60, and the second output conductor 65 is pressed against the second circumferential side wall 32, so that stable electric connection between the second output conductor 65 and the second diode housing 30 is realized. The structure is assembled more conveniently, the metal ring is tightly sleeved on the battery core 60, the second output conductor 65 extending out of the battery core 60 is arranged on the outer side wall of the metal ring, the second electrode shell 30 is finally pressed onto the second output conductor 65, tight fit is formed among the outer side wall of the metal ring, the second output conductor 65 and the second circumferential side wall 32, and stable electric connection between the second output conductor 65 and the second electrode shell 30 is realized. The metal ring may be a copper ring, a nickel ring, a stainless steel ring, or the like, and may be any metal ring, which is capable of electrically connecting the second output conductor 65 and the second diode case 30, and is not limited thereto.

Further, on the basis of the above embodiment, one end of the second positioning ring 70 is provided with an inward flange 71. The inward flange 71 is crimped to the junction of the circumferential outer side of the battery cell 60 and the end face of the second end of the battery cell 60. The second pole housing 30 is then tightly fitted over the outer side of the inner second retaining ring 70. So that the outer side wall of the second output conductor 65, the second positioning ring 70 and the second circumferential side wall 32 form close fit, and stable electric connection between the second output conductor 65 and the second diode housing 30 is realized. Specifically, the second positioning ring 70 is made of 304 stainless steel, the wall thickness is 0.1mm, the ring height is 0.6mm, and the length of the inner flange 71 is 1.5mm. The arrangement of the inner flange 71 can better restrict the tight fit of the battery cell 60, is more beneficial to assembly, has high production efficiency and is easy to realize production automation.

The structure for fitting the first pole case 20 to the first output conductor 64 may be the one described above with reference to the embodiment for fitting the second pole case 30 to the second output conductor 65.

Specifically, in the first embodiment in which the first pole housing 20 is mounted in cooperation with the first output conductor 64, the first output conductor 64 extends from the battery cell 60 and is folded over on the circumferential outer side of the battery cell 60. The first electrode shell 20 is sleeved on one end of the battery core 60, and the first circumferential sidewall 22 is electrically connected with the first output conductor 64.

In the second embodiment, in which the first pole housing 20 is mounted in cooperation with the first output conductor 64, a first retaining ring 72 is also included. The first positioning ring 72 is sleeve-shaped with two open ends, and is sleeved on the outer side of one end of the battery cell 60, and the first output conductor 64 is electrically connected with the first circumferential side wall 22 through the first positioning ring 72.

In the third embodiment in which the first pole housing 20 is fitted with the first output conductor 64, the first output conductor 64 extends from the battery cell 60 and is folded over onto the circumferential outer side of the battery cell 60. The first positioning ring 72 is sleeved on the battery core 60 and is electrically connected with the first output conductor 64 and the first polar shell 20 respectively.

On the basis of the third embodiment, the first positioning ring 72 has a porous structure, an outward flange 73 is further provided at one end of the first positioning ring 72, the first positioning ring 72 is sleeved on the battery cell 60, the outward flange 73 abuts against the first circumferential side wall 22, and the second end of the first positioning ring 72 abuts against the first bottom wall 21. A cavity 80 is formed between the first positioning ring 72, the outward flange 73, the first bottom wall 21 and the first circumferential side wall 22. The first positioning ring 72 is electrically connected with the first pole housing 20 through the outward flange 73 to be more stable, and the cavity 80 can store electrolyte by utilizing the inner cavity of the battery to a greater extent, and the electrolyte can permeate into the battery cell 60 through the first positioning ring 72 to help the battery cell 60 to generate more electric energy.

In order to make the setting of the insulating sealing ring 40 more stable and firm, the insulating installation of the first pole housing 20 and the second pole housing 30 is also more firm. The first pole housing 20 is hollow inside and is provided with an opening at one end. The first pole housing 20 further comprises a first end bead 23, the first end bead 23 being provided on an end of the first circumferential side wall 22 remote from the first bottom wall 21. The first end bead 23 is crimped onto the junction of the circumferential outer side of the insulating seal 40 and the end face of the insulating seal 40 remote from the first bottom wall 21.

To ensure insulation between the two ends of the battery cell 60 and the first and second pole cases 20, 30. In one embodiment, the width of the diaphragm 63 is greater than the width of the first and second pole pieces 61, 62. The first pole piece 61, the second pole piece 62 and the diaphragm 63 are rolled into the battery cell 60, two isolation parts are formed by folding parts of two sides of the diaphragm 63, which exceed the first pole piece 61 and the second pole piece 62, and the two isolation parts are respectively abutted with the inner bottom wall of the first pole shell 20 and the inner bottom wall of the second pole shell 30.

In another embodiment, an insulating layer 74 is also included. An insulating layer 74 is provided between the first end of the cell 60 and the first pole housing 20 and/or between the second end of the cell 60 and the second pole housing 30. The insulating layer 74 serves to electrically insulate the battery cell 60 from the first pole housing 20 and/or the second pole housing 30. Avoiding the leakage of the electrode part at the end of the battery cell 60 and poor use caused by the connection of the electric circuit with the first electrode shell 20 and/or the second electrode shell 30. The insulating layer 74 is provided with a through hole, and the first output conductor 64 and the second output conductor 65 may extend from the through hole and then be electrically connected to the first pole case 20 and the second pole case 30.

It will be appreciated that the first output conductor 64 extends from the cell 60 and is folded over to lie circumferentially outward of the cell 60, including: the first output conductor 64 extends from the cell 60 and is folded over onto the circumferential outer side of the cell 60; the first output conductor 64 extends from the cell 60 and is folded over onto the circumferential outer side of the first positioning ring 72. The second output conductor 65 extends from the battery cell 60 and is folded over to be located on the outer side in the circumferential direction of the battery cell 60, including: the second output conductor 65 extends from the battery cell 60 and is folded over onto the circumferential outer side of the battery cell 60; the second output conductor 65 extends from the cell 60 and is folded over onto the circumferential outer side of the second positioning ring 70.

In addition to the above embodiments, the first pole shell 20 and the first circumferential sidewall 22, and the second pole shell 30 and the second circumferential sidewall 32 may be electrically connected by soldering. In particular, the method can be realized by adopting a precise resistance spot welding mode, an ultrasonic welding mode or a laser welding mode. Because the depth of the second electrode case 30 is shallower, the welding connection method requires higher positioning accuracy and equipment customization, and has higher cost and lower efficiency.

In addition to the above embodiments, the electrical connection manner between the first polar shell 20 and the first circumferential sidewall 22, and the electrical connection manner between the second polar shell 30 and the second circumferential sidewall 32 may be cured by conductive adhesive. Specifically, the first output conductor 64 is fixedly bonded to the first circumferential side wall 22 by a conductive adhesive, and the second output conductor 65 is fixedly bonded to the second circumferential side wall 32 by a conductive adhesive. For example, epoxy conductive nickel paste is coated on the inner side walls of the output conductor and the pole shell, and conductive connection of the output conductor and the pole shell is achieved through heat curing. It should be noted that, the conductive adhesive is an adhesive with a certain conductive property after curing, and generally uses a matrix resin and a conductive filler, i.e. conductive particles, as main components. The conductive particles are combined together through the bonding action of the matrix resin to form a conductive path, so that the conductive connection of the adhered material is realized. The conductive adhesive has the characteristics of strong adhesive force, low impedance, good welding resistance, strong ageing resistance and the like.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A button cell, comprising:

the first pole shell comprises a first bottom wall and a first circumferential side wall arranged on the periphery of the first bottom wall;

The battery cell is arranged in the accommodating cavity and comprises a first pole piece, a second pole piece and a diaphragm, wherein the first pole piece, the second pole piece and the diaphragm are separated by the diaphragm, the first pole piece, the second pole piece and the diaphragm are laminated or wound to form the battery cell, at least one first output conductor is arranged on the first pole piece, extends out of the battery cell, is folded and positioned on the outer side of the periphery of the battery cell and is electrically connected with the first pole shell, at least one second output conductor is arranged on the second pole piece, extends out of the battery cell, is folded and positioned on the outer side of the periphery of the battery cell and is electrically connected with the second pole shell;

the first positioning ring is sleeved on the battery core and is respectively and electrically connected with the first output conductor and the first polar shell, the first positioning ring is provided with an outward flange, the outward flange is abutted with the first circumferential side wall, and a cavity for accommodating electrolyte is formed among the first positioning ring, the outward flange, the first bottom wall and the first circumferential side wall;

the second locating ring is sleeved at the second end of the battery cell, an inward flanging is arranged at the first end of the second locating ring, the inward flanging is buckled to the joint of the circumferential outer side of the battery cell and the end face of the second end of the battery cell, and the second end of the second locating ring is abutted to the circumferential outer side of the battery cell so as to clamp the second output conductor between the end face of the battery cell and the circumferential outer side and the second locating ring.

2. The button cell of claim 1, wherein the first pole piece, the second pole piece, and the separator are wound to form the cell, and the first output conductor is routed out of the first pole piece located at the outermost layer of the cell, and the second output conductor is routed out of the second pole piece located at the outermost layer of the cell.

3. The button cell of claim 1, wherein the first pole housing is disposed on a first end of the electrical core, and the first circumferential sidewall is electrically connected to the first output conductor; the second electrode shell comprises a second bottom wall and a second circumferential side wall arranged on the periphery of the second bottom wall, the second electrode shell is sleeved on the second end of the battery cell, and the second circumferential side wall is electrically connected with the second output conductor.

4. The button cell of claim 1 wherein the second retaining ring is a metal ring.

5. The button cell of claim 4, wherein the second retaining ring is a copper ring, a nickel ring, or a stainless steel ring.

6. The button cell of claim 1, wherein the first retaining ring is sleeve-shaped with openings at both ends.

7. The button cell of claim 1 wherein the first retaining ring is porous.

8. The button cell of claim 3, wherein the first pole housing further comprises a first end bead disposed on an end of the first circumferential side wall remote from the first bottom wall, the first end bead being crimped to a junction of a circumferential outer side of the insulating seal ring and an end face of the insulating seal ring remote from the first bottom wall.

9. The button cell of claim 1, further comprising an insulating layer disposed between the first end of the electrical core and the first pole housing; and/or the insulating layer is arranged between the second end of the battery cell and the second electrode shell.

10. The button cell of claim 1, wherein when the first pole piece and the second pole piece are stacked to form the electrical core, a first connection end extends out of an end of each layer of the first pole piece, and the first output conductor is connected with an end of each first connection end; the end parts of the second pole pieces of each layer are extended out of second connecting ends, and the second output conductors are connected with the end parts of the second connecting ends.