CN211629210U - Button cell without welding trace - Google Patents
Button cell without welding trace Download PDFInfo
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- CN211629210U CN211629210U CN202020763039.XU CN202020763039U CN211629210U CN 211629210 U CN211629210 U CN 211629210U CN 202020763039 U CN202020763039 U CN 202020763039U CN 211629210 U CN211629210 U CN 211629210U
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- shell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model provides a button battery without welding traces, which comprises an anode shell, a cathode shell, an insulating sealing ring and an electric core, wherein the electric core is mainly formed by laminating or winding an anode sheet, a cathode sheet and a diaphragm layer, the cathode sheet is electrically connected with a cathode tab, one end of the cathode tab, which extends out of the electric core, is fixedly connected with the outer surface of a metal sheet through a first welding spot, the inner surface of the cathode tab is horizontally and fixedly arranged with the metal sheet through a second welding spot, the number of the second welding spots is more than or equal to 1 pair, two second welding spots of the same pair are arranged in a staggered manner, and simultaneously, the first welding spot and the second welding spot are arranged in a staggered manner; the positive plate is electrically connected with a positive pole lug, one end of the positive pole lug, which extends out of the battery core, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the end wall of the opening of the positive shell. The utility model discloses a button cell surface levels intact, can avoid appearing phenomenons such as weeping and the surface swell of electrolyte.
Description
Technical Field
The utility model belongs to the technical field of the button cell and specifically relates to a button cell without welding vestige.
Background
Button cells (button cells) are also called button cells, and refer to cells with the overall dimensions like a small button, generally speaking, the button cells have a larger diameter and a thinner thickness (compared with cylindrical cells such as a cell with a size of 5 AA on the market), the button cells are classified from the aspect of the appearance, and the equivalent corresponding cells are classified into cylindrical cells, square cells, special-shaped cells and the like.
Button cells include both laminate and wound. The basic structure of the winding type button cell is as follows: the button battery comprises a first pole shell, a second pole shell, an insulating seal ring and a battery cell, wherein the upper openings and the lower openings of the first pole shell and the second pole shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the first pole shell and the second pole shell, the gap is filled with an insulating sealing ring to electrically isolate the first pole shell from the second pole shell, and an accommodating cavity is formed among the first pole shell, the second pole shell and the insulating sealing ring; the electric core is located the holding intracavity, electric core include first pole piece, second pole piece and diaphragm, through the diaphragm interval between first pole piece and the second pole piece, first pole piece, second pole piece and diaphragm are convoluteed and are made electric core, and the center of electric core is formed with the axial cavity, is equipped with first output conductor on the first pole piece, and first output conductor stretches out and welds with first polar shell from electric core, is equipped with second output conductor on the second pole piece, and second output conductor stretches out and welds with second polar shell from electric core. When the conventional coiled button battery is manufactured, a first output conductor of a battery core is bent to enable the first output conductor to be tightly attached to the lower surface of the battery core, and the first output conductor extends to the position right below an axial cavity; then vertically arranging the battery cell into the first pole shell; then, the welding needle is vertically inserted downwards into the axial cavity, the first output conductor is tightly pressed on the first shell, and the first output conductor and the first polar shell are welded together in an electric resistance welding mode, or the first polar shell and the first output conductor are welded together in a laser welding mode by emitting laser from the lower part of the first polar shell opposite to the area of the first polar shell, which is vertically overlapped with the first output conductor; welding a second output conductor of the battery cell on a second pole shell, wherein an insulating sealing ring is sleeved outside the second pole shell; and finally, covering the opening at the upper end of the first polar shell together with the second polar shell and the insulating sealing ring, and sealing. One of the first pole shell and the second pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a battery positive pole loop of the battery, and the other pole shell, the corresponding output conductor and the corresponding battery cell pole piece form a battery negative pole loop of the battery. Because first output conductor and first utmost point shell welding time, the electric current that resistance welded and the laser beam of laser welding all can pierce through first utmost point shell, and the solder joint of connecting first utmost point shell and first output conductor runs through first utmost point shell setting, has destroyed the surface smoothness and the stability of first utmost point shell, and in the battery use, the solder joint position of first utmost point shell appears the weeping and the surface swell phenomenons such as electrolyte easily.
Disclosure of Invention
The utility model aims at providing a no welding vestige button cell, this button cell's utmost point shell surfacing is intact, can avoid appearing phenomenons such as weeping and the surface swell of electrolyte.
A button battery without welding traces comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, and the opening end wall of the positive electrode shell is positioned on the inner side of the opening end wall of the negative electrode shell; a gap is reserved between the opening end wall of the positive electrode shell and the opening end wall of the negative electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; the connection structure between the negative pole tab and the negative pole shell is as follows: one end of the negative electrode lug, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding point, the inner surface of the negative electrode shell is horizontally and fixedly provided with the metal sheet through second welding points, the number of the second welding points is more than or equal to 1 pair, different pairs of second welding points can be overlapped, two second welding points of the same pair are arranged in a staggered manner, and meanwhile, the first welding point and the second welding points are arranged in a staggered manner; the connection structure between the positive pole lug and the positive pole shell is as follows: and one end of the positive electrode lug, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the opening end wall of the positive electrode shell.
The utility model discloses a first solder joint and second solder joint all lie in the inboard of utmost point shell in the welded structure between negative pole utmost point ear and the negative pole shell among the button cell, the surface of negative pole shell keeps levelly and smoothly intact, and, the second solder joint between sheetmetal and the negative pole shell is large in quantity, it is more firm to connect between negative pole shell and the sheetmetal, contact internal resistance is also littleer, simultaneously, the third solder joint between negative pole utmost point ear and the negative pole shell is large in quantity, it is more firm to connect between negative pole utmost point ear and the negative pole shell, and contact internal resistance is little, contact internal resistance is little and does benefit to improving the discharge efficiency of battery; meanwhile, one end of the positive pole lug, extending out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring, and the positive pole lug is in physical contact connection with the opening end wall of the positive pole shell to realize electric connection, so that the positive pole shell is kept intact.
In order to make the contact between the positive electrode tab and the opening end wall of the positive electrode casing tighter, it is preferable that a recessed portion recessed inward in the radial direction of the positive electrode casing is provided on the opening end wall of the positive electrode casing, and the recessed portion abuts against the positive electrode tab between the insulating seal ring and the opening end wall of the positive electrode casing. Further preferably, the annular concave part is arranged on the opening end wall of the positive electrode shell along the circumferential direction of the opening end wall, so that the manufacturing is convenient.
Preferably, all the second welding points are uniformly distributed around the circumference by taking the center of the cathode shell as a circle center. More preferably, the second welding points of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more facilitated.
Preferably, the lower end of the insulating sealing ring extends inwards to form a bending part, and the bending part wraps the edge of the end wall of the opening of the negative electrode shell, so that the insulating sealing ring is convenient to mount. Further, the bottom of the kink of insulating seal circle and anodal utmost point ear butt for anodal utmost point ear is pressed and is supported on the internal surface of anodal shell, thereby improves the structural stability of anodal utmost point ear and the contact stability between anodal utmost point ear and the anodal shell.
Preferably, the second welding points of different pairs are not overlapped, so that the problem that the welding electrode and the metal sheet are bonded together to cause the trouble of needle poking due to the fact that a molten pool is enlarged when the second welding points of different pairs are overlapped is avoided.
Drawings
Fig. 1 is a schematic view of a welding structure of a negative electrode tab and a metal sheet in any one of embodiments 1 to 3, wherein the metal sheet is a cross-sectional structural view;
fig. 2 is a schematic view of a welding structure of the negative electrode case and the metal sheet according to any one of embodiments 1 to 3, wherein both the negative electrode case and the metal sheet are cross-sectional structural diagrams;
fig. 3 is a top view structural view of a negative electrode can in example 1;
FIG. 4 is a schematic cross-sectional view of a button cell without any welding trace in any of embodiments 1-3;
FIG. 5 is an enlarged view of portion A of FIG. 4;
fig. 6 is a top view structural view of a negative electrode can in example 2;
fig. 7 is a top view structural view of a negative electrode can in example 3;
wherein the dashed circles 60 in fig. 3, 6 and 7 indicate the location of the second welding points.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings:
example 1
With reference to fig. 1 to 4, a button battery without welding traces comprises a positive electrode shell 11, a negative electrode shell 12, an insulating seal ring 70 and a battery core 30, wherein the positive electrode shell 11 and the negative electrode shell 12 are both cup-shaped, and the upper and lower openings of the positive electrode shell 11 and the negative electrode shell 12 are oppositely buckled to form a cylindrical button battery shell; the positive electrode can 11 and the negative electrode can 12 are partially overlapped in the vertical direction, the opening end wall 111 of the positive electrode can 11 is positioned at the inner side of the opening end wall 112 of the negative electrode can 12, a gap is left between the opening end wall 111 of the positive electrode can 11 and the opening end wall 121 of the negative electrode can 12, and the insulating sealing ring 70 fills the gap to electrically isolate the positive electrode can 11 from the negative electrode can 12; an accommodating cavity is formed among the positive electrode shell 11, the negative electrode shell 12 and the insulating sealing ring 70; the battery cell 30 is arranged in the accommodating cavity, the battery cell 30 is mainly formed by laminating or winding a positive plate 31, a negative plate 32 and a diaphragm 33, the positive plate 31 is electrically connected with a positive pole tab 21, the positive pole tab 21 is electrically connected with the positive shell 11, the negative plate 32 is electrically connected with a negative pole tab 22, and the negative pole tab 22 is electrically connected with the negative shell 12; the connection structure between the negative electrode tab 22 and the negative electrode case 12 is: one end of the negative electrode tab 22, which extends out of the battery cell 30, is fixedly connected with the outer surface of a metal sheet 40 through a first welding point 50, the metal sheet 40 is horizontally and fixedly arranged on the inner surface of the negative electrode shell 12 through second welding points 60, the number of the second welding points 60 is not less than 1 pair, different pairs of the second welding points 60 can be overlapped, two second welding points 60 of the same pair are arranged in a staggered manner, and meanwhile, the first welding points 50 and the second welding points 60 are arranged in a staggered manner; the connection structure between the positive electrode tab 21 and the positive electrode shell 11 is as follows: one end of the positive electrode tab 21 extending out of the battery cell 30 is bent upwards from the lower part of the insulating seal ring 70 along the outer side wall of the insulating seal ring 70, and is clamped between the insulating seal ring 70 and the opening end wall 111 of the positive electrode shell 11;
wherein the number of the second pads 60 is 1 pair.
Example 2
As shown in fig. 6, the button cell without welding marks of example 2 is different from the button cell without welding marks of example 1 in that: the number of the second pads 60 is 2 pairs, and two of the second pads 60 of different pairs overlap, and the rest of the structure is the same as that of embodiment 1.
Example 3
As shown in fig. 7, the button cell without welding marks of example 3 is different from the button cell without welding marks of example 1 in that: the number of the second welding points 60 is 3 pairs, and the second welding points 60 of different pairs are not overlapped, and the rest of the structure is the same as that of the embodiment 1.
The button cell without welding traces in the embodiments 1 to 3 only forms a molten pool and a welding spot on the inner side of the negative electrode shell 12, so that the appearance of the negative electrode shell 12 is kept complete, the risk of battery leakage caused by welding point fracture is avoided, 2 to 3 pairs of second welding spots 60 are formed between the metal sheet 40 and the negative electrode shell 12, the connection stability between the metal sheet 40 and the negative electrode shell 12 is better, meanwhile, the contact internal resistance between the metal sheet 40 and the negative electrode shell 12 is small, the improvement of the discharge efficiency of the cell is facilitated, meanwhile, the appearance of the positive electrode shell 11 can be kept complete, and leakage is avoided.
Generally, the positive and negative electrode tabs (21, 22) are both metal foils that can be bent at will.
The button cell without welding marks of the embodiments 1 to 3 can be improved as follows:
(1) in order to make the contact between the positive electrode tab 21 and the open end wall 111 of the positive electrode can 11 more intimate, it is preferable that, in conjunction with fig. 4 and 5, the open end wall 111 of the positive electrode can be provided with a recessed portion 80 recessed inward in the radial direction of the positive electrode can 11, the recessed portion 80 abutting against the positive electrode tab 21 clamped between the insulating seal ring 70 and the open end wall of the positive electrode can 11. Further preferably, as shown in fig. 4, the opening end wall 111 of the positive electrode can 11 is provided with an annular recess 80 along the circumferential direction thereof, which is convenient for manufacturing, but of course, the recess 80 may be provided only at the position of the opening end wall 111 of the positive electrode can 11 where the positive electrode tab 21 and the insulating seal ring correspond to each other;
(2) as shown in fig. 3, 6, and 7, all the second welding points 60 are uniformly distributed around the circumference around the center of the negative electrode can 12. More preferably, as shown in fig. 3, 6, and 7, the second welding points 60 of each pair are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more facilitated;
(3) as shown in fig. 4, the lower end of the insulating sealing ring 70 extends inward to form a bent portion 71, and the bent portion 71 wraps the edge of the open end wall 121 of the negative electrode can 12 therein to facilitate the installation of the insulating sealing ring 70. Further, the bottom of the bent portion 710 of the insulating sealing ring 70 abuts against the positive electrode tab 21, so that the positive electrode tab is pressed against the inner surface of the positive electrode shell, thereby improving the structural stability of the positive electrode tab 21 and the contact stability between the positive electrode tab 21 and the positive electrode shell 11.
With reference to fig. 1 to 4, the method for electrically connecting the negative electrode tab 22 and the negative electrode case 12 in the button cell without the weld mark according to any one of examples 1 to 3 includes the following steps:
s1: preparing a metal sheet 40, welding one end of the negative electrode tab 22 extending out of the battery core 30 on the metal sheet 40, forming a first welding point 50 between the negative electrode tab 22 and the metal sheet 40, and then horizontally placing the metal sheet 40 in the negative electrode shell 11;
s2: pressing the metal sheet 40 against the inner surface of the negative electrode casing 11 to prepare a first resistance welding device, wherein the first resistance welding device comprises two first welding electrodes (100 and 200), respectively pressing the two first welding electrodes (100 and 200) against different positions on the outer surface of the metal sheet 40 except for the welding position of the metal sheet 40 and the negative electrode tab 22 in step S1, and then energizing the two first welding electrodes (100 and 200) in the step to fixedly connect the negative electrode casing 12 and the metal sheet 40, wherein the welding step in step S2 is performed for 1 or more times, at least 1 pair of second welding points 60 are formed between the metal sheet 40 and the negative electrode casing 11, and the welding positions of the metal sheet 40 and the negative electrode casing 11 in step S2 in different times can be overlapped;
step S2 is performed only once, and the number of the second welding spots 60 is 1 pair;
in addition, the positive electrode tab 21 and the positive electrode can 11 are electrically connected in the following manner: one end of the positive electrode tab 21 extending out of the battery cell 30 is bent upward from the lower side of the insulating seal ring 70 along the outer side wall of the insulating seal ring 70, and is clamped between the insulating seal ring 70 and the opening end wall 111 of the positive electrode shell 11.
The utility model discloses only can form molten bath and solder joint in the inboard of negative pole shell 12 to keep negative pole shell 12 outward appearance complete, stop to lead to the fact the risk of battery weeping because of the solder joint breaks, and, form the second solder joint 60 of at least 1 pair between sheetmetal 40 and the negative pole shell 12, the connection stability between sheetmetal 40 and the negative pole shell 12 is better, simultaneously, the solder joint is in large quantity between sheetmetal 40 and the negative pole shell 12, also can reduce the contact internal resistance between sheetmetal 40 and the negative pole shell 12, increase the discharge efficiency of battery; in addition, the welding quality between the negative electrode tab 22 and the metal sheet 40 and between the metal sheet 40 and the negative electrode shell 12 can be conveniently detected, and the cold joint can be avoided, in addition, one end of the positive electrode tab 21 extending out of the battery cell 30 is bent upwards from the lower part of the insulating sealing ring 70 along the outer side wall of the insulating sealing ring 70, and is clamped and arranged between the insulating sealing ring 70 and the opening end wall 111 of the positive electrode shell, the electric connection can be realized through the physical contact connection between the positive electrode tab 21 and the opening end wall 111 of the positive electrode shell 11, and the positive electrode shell can be kept intact.
It should be noted that the number of the second welding spots 60 of the present invention is not limited to 1, 2, and 3 pairs, and may be 4 pairs or more than 4 pairs. Meanwhile, the first solder joints 50 of the present invention are not limited to 1 solder joint in the drawings, and may be 2 solder joints or more than 2 solder joints. The structure of the battery cell 30 of the present invention is not limited to the specific structure shown in the drawings, and may be any battery cell structure.
Claims (8)
1. A button battery without welding traces comprises a positive electrode shell, a negative electrode shell, an insulating sealing ring and a battery cell, wherein the positive electrode shell and the negative electrode shell are both cup-shaped, and the upper openings and the lower openings of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell are partially overlapped in the vertical direction, and the opening end wall of the positive electrode shell is positioned on the inner side of the opening end wall of the negative electrode shell; a gap is reserved between the opening end wall of the positive electrode shell and the opening end wall of the negative electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the positive electrode shell from the negative electrode shell, and an accommodating cavity is formed among the positive electrode shell, the negative electrode shell and the insulating sealing ring; the battery cell is arranged in the accommodating cavity and mainly formed by laminating or winding a positive plate, a negative plate and a diaphragm, wherein the positive plate is electrically connected with a positive pole lug, the positive pole lug is further electrically connected with the positive shell, the negative plate is electrically connected with a negative pole lug, and the negative pole lug is further electrically connected with the negative shell; the lithium ion battery is characterized in that the connection structure between the negative pole lug and the negative pole shell is as follows: one end of the negative electrode lug, which extends out of the battery core, is fixedly connected with the outer surface of a metal sheet through a first welding point, the inner surface of the negative electrode shell is horizontally and fixedly provided with the metal sheet through second welding points, the number of the second welding points is more than or equal to 1 pair, different pairs of second welding points can be overlapped, two second welding points of the same pair are arranged in a staggered manner, and meanwhile, the first welding point and the second welding points are arranged in a staggered manner; the connection structure between the positive pole lug and the positive pole shell is as follows: and one end of the positive electrode lug, which extends out of the battery cell, is bent upwards from the lower part of the insulating sealing ring along the outer side wall of the insulating sealing ring and is clamped between the insulating sealing ring and the opening end wall of the positive electrode shell.
2. The button cell without welding marks of claim 1, wherein: the end wall of the opening of the positive electrode shell is provided with a sunken part which is sunken inwards along the radial direction of the positive electrode shell, and the sunken part is abutted with a positive electrode lug between the insulating sealing ring and the end wall of the opening of the positive electrode shell.
3. The button cell without welding marks as set forth in claim 2, wherein: and an annular concave part is arranged on the opening end wall of the positive electrode shell along the circumferential direction of the opening end wall.
4. The button cell without welding marks of claim 1, wherein: all the second welding points are uniformly distributed around the circumference by taking the center of the cathode shell as a circle center.
5. The button cell without welding marks as set forth in claim 4, wherein: the second welding points of each pair are symmetrically distributed.
6. The button cell without welding marks of claim 1, wherein: the lower end of the insulating sealing ring extends inwards to form a bending part, and the bending part wraps the edge of the end wall of the opening of the negative electrode shell.
7. The button cell without welding marks as set forth in claim 6, wherein: and the bottom of the bent part of the insulating sealing ring is abutted with the positive pole lug.
8. The button cell without welding marks of claim 1, wherein: the second welding points of different pairs do not overlap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020763039.XU CN211629210U (en) | 2020-05-11 | 2020-05-11 | Button cell without welding trace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020763039.XU CN211629210U (en) | 2020-05-11 | 2020-05-11 | Button cell without welding trace |
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| Publication Number | Publication Date |
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| CN211629210U true CN211629210U (en) | 2020-10-02 |
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| CN202020763039.XU Active CN211629210U (en) | 2020-05-11 | 2020-05-11 | Button cell without welding trace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111370636A (en) * | 2020-05-11 | 2020-07-03 | 福建南平延平区南孚新能源科技有限公司 | Production method of button battery without welding trace and button battery manufactured by same |
| CN112736279A (en) * | 2021-01-12 | 2021-04-30 | 广东维都利新能源有限公司 | Button cell with safety device and manufacturing method thereof |
| CN114069112A (en) * | 2021-11-11 | 2022-02-18 | 深圳市合壹新能技术有限公司 | Button cell |
-
2020
- 2020-05-11 CN CN202020763039.XU patent/CN211629210U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111370636A (en) * | 2020-05-11 | 2020-07-03 | 福建南平延平区南孚新能源科技有限公司 | Production method of button battery without welding trace and button battery manufactured by same |
| CN111370636B (en) * | 2020-05-11 | 2024-06-25 | 福建南平延平区南孚新能源科技有限公司 | Production method of button cell without welding trace and prepared button cell |
| CN112736279A (en) * | 2021-01-12 | 2021-04-30 | 广东维都利新能源有限公司 | Button cell with safety device and manufacturing method thereof |
| CN114069112A (en) * | 2021-11-11 | 2022-02-18 | 深圳市合壹新能技术有限公司 | Button cell |
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