CN211578903U - Button cell with no trace welded structure - Google Patents

Abstract

The utility model provides a button cell with no trace welded structure, connection structure between positive pole shell and the anodal utmost point ear and at least one connection structure among the connection structure between negative pole shell and the negative pole utmost point ear adopt no trace welded structure, no trace welded structure is: the electrode lug is fixedly connected with the outer surface of a metal sheet through a first welding point, the metal sheet is fixedly arranged on the inner surface of the electrode shell through second welding points, the number of the second welding points is more than or equal to 1 pair, two second welding points of the same pair are arranged in a staggered mode, and meanwhile, the first welding points and the second welding points are arranged in a staggered mode; the outer contour line of the metal sheet covering area on the pole shell is positioned outside the outer contour line of the battery core axial cavity covering area, and the second welding spot is positioned on the metal sheet outside the battery core axial cavity covering area. The utility model discloses a welded structure's utmost point shell surface is complete, and welds the convenience.

Description

Button cell with no trace welded structure

Technical Field

The utility model relates to a button cell with no trace welded structure.

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

An object of the utility model is to provide a button cell with no trace welded structure, this button cell's no trace welded structure can keep utmost point shell surfacing intact, and then avoids appearing phenomenons such as weeping and the surface swell of electrolyte.

A button battery with a traceless welding structure 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 opening and the lower opening of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring 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; at least one connection structure among connection structure between anodal shell and the anodal utmost point ear and the connection structure between negative pole shell and the negative pole utmost point ear adopts no trace welded structure, no trace welded structure is: one end of the electrode lug extending out of the battery cell is fixedly connected with the outer surface of a metal sheet through a first welding point, the inner surface of the 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 mode, and meanwhile, the first welding point and the second welding points are arranged in a staggered mode; the outer contour line of the metal sheet covering area on the pole shell is positioned outside the outer contour line of the battery core axial cavity covering area, and the second welding spot is positioned on the metal sheet outside the battery core axial cavity covering area.

In the traceless welding structure of the button battery, the first welding spot and the second welding spot are both positioned at the inner side of the pole shell, and the outer surface of the pole shell is kept flat and intact; meanwhile, the internal resistance of the welding position between the pole shell and the metal sheet is usually smaller than that of the physical contact position between the pole shell and the metal sheet, so that the whole contact internal resistance between the pole shell and the metal sheet is smaller, and the smaller the contact internal resistance is, the more beneficial to battery discharge is; in addition, the welding operation between the metal sheet and the pole shell is more convenient.

Preferably, the connection structure between the negative electrode shell and the negative electrode tab adopts a traceless welding structure. Because the negative electrode shell is used as a bottom shell and the positive electrode shell is used as a top shell in the existing manufacturing process of the button battery, the battery core is firstly arranged in the bottom shell, and then the top shell is arranged corresponding to the cover to assemble the battery, so that the operability of a traceless welding structure adopted between the negative electrode shell and the negative electrode lug is stronger.

Preferably, all the second welding points of the traceless welding structure are uniformly distributed around the circumference by taking the center of the polar shell as a circle center. More preferably, the second welding points of each pair of the traceless welding structures are symmetrically distributed, so that the welding efficiency is higher, and the automatic welding is more facilitated.

Drawings

Fig. 1 is a schematic view of a welding structure of an electrode tab and a metal sheet of a traceless welding structure 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 a pole shell and a metal sheet of the traceless welding structure in any one of embodiments 1 to 3, wherein both the pole shell and the metal sheet are cross-sectional structural diagrams;

FIG. 3 is a top view structural diagram of a pole case of a traceless welded structure in example 1;

FIG. 4 is a schematic sectional view of a button cell in example 1;

FIG. 5 is a top view structural view of a pole case of a traceless welded structure in example 2;

FIG. 6 is a top view structural view of a pole case of a traceless welded structure in example 3;

FIG. 7 is a schematic sectional view showing a button cell according to example 4;

wherein the dashed circles 60 in fig. 3, 5, 6 indicate the location of the second weld spot.

Detailed Description

The embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

example 1

With reference to fig. 1-3, a button cell electrode shell and electrode tab seamless welding structure comprises an electrode shell 10 and an electrode tab 20, the electrode shell 10 is cup-shaped, the battery cell 30 is installed in the electrode shell 10, the battery cell 30 is mainly formed by winding a positive plate 31, a negative plate 32 and a diaphragm 33, an axial cavity 34 is formed at the center of the battery cell 30, the positive plate (31) and the negative plate (32) are respectively and electrically connected with an electrode tab 20, one end of any electrode tab 20 extending 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 sheets 40 are horizontally and fixedly disposed on the inner surface of the electrode case 10 corresponding to any one of the electrode tabs 20 by second welding points 60, the number of the second welding points 60 is 1 pair, the second welding spots 60 of different pairs can be overlapped, the two second welding spots 60 of the same pair are arranged in a staggered manner, and meanwhile, the first welding spots 50 and the second welding spots 60 are arranged in a staggered manner; the outer contour line 40 'of the area covered by the metal sheet 40 on the pole casing 10 is located outside the outer contour line 34' of the area covered by the cell axial cavity 34, and the second welding point 60 is located on the metal sheet 40 outside the area covered by the cell axial cavity 34.

The utility model discloses only can form molten bath and solder joint in the inboard of utmost point shell 10, thereby it is complete to keep utmost point shell 10 outward appearance, stop and break the risk that causes the battery weeping because of the solder joint, and, form 1 between sheetmetal 40 and the utmost point shell 10 to second solder joint 60, connection stability between sheetmetal 40 and the utmost point shell 10 is better, and simultaneously, solder joint is in large quantity between sheetmetal 40 and the utmost point shell 10, also can reduce the contact internal resistance between sheetmetal 40 and the utmost point shell 10, do benefit to the discharge efficiency who improves the battery, in addition, the welding operation between sheetmetal 40 and the utmost point shell 10 is also more convenient.

In the button cell electrode shell and electrode tab seamless welding structure of embodiment 1, the electrode shell 10 is a negative electrode shell, and the electrode tab 20 electrically connected to the electrode shell correspondingly is a negative electrode tab 22 electrically connected to a negative electrode sheet 32; of course, if the button cell electrode shell and the electrode tab have a seamless welding structure, if the electrode shell is a positive electrode shell, the electrode tab 20 electrically connected with the electrode shell correspondingly is the positive electrode tab 21 electrically connected with the positive electrode sheet 31.

As shown in fig. 4, embodiment 1 further provides a button battery with a traceless welding structure, which includes a positive electrode case 11, a negative electrode case 12, an insulating seal ring 70 and a battery cell 30, wherein the positive electrode case 11 and the negative electrode case 12 are both cup-shaped, and the upper and lower openings of the positive electrode case 11 and the negative electrode case 12 are oppositely buckled to form a cylindrical button battery case; a gap is reserved between the positive electrode shell 11 and the negative electrode shell 12, the insulating sealing ring 70 is filled in the gap to electrically isolate the positive electrode shell 11 from the negative electrode shell 12, and 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 winding a positive plate 31, a negative plate 32 and a diaphragm 33, an axial cavity 34 is formed in the center of the battery cell 30, 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 connecting structure between the negative electrode shell 12 and the negative electrode tab 22 adopts the button cell pole shell and electrode tab seamless welding structure of embodiment 1; the connection structure between the positive electrode shell 11 and the positive electrode tab 21 adopts a welding structure formed by directly welding the positive electrode tab 21 on the inner surface of the positive electrode shell 11 in the inner side of the positive electrode shell 11 in a resistance welding mode of parallel welding, namely, the fixed connection is realized between the inner surface of the positive electrode shell 11 and the positive electrode tab 21 through a third welding point 300, the number of the third welding points 300 is 1 pair, and two third welding points 300 of the same pair are arranged in a staggered mode. Of course, the number of the third solder joints 300 is not limited to 1 pair, and may be 2 pairs or more than 2 pairs.

Example 2

As shown in fig. 5, the coin cell electrode shell and electrode tab seamless welding structure of example 2 is different from the welding structure 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. 6, the coin cell electrode shell and electrode tab seamless welding structure of example 3 is different from the welding structure 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 welding structure of embodiment 2 and embodiment 3 also only can form the molten bath and weld spot in utmost point shell 10 inboard to keep utmost point shell 10 outward appearance complete, stop to cause the risk of battery weeping because of the welding point breaks, and, form 2~3 pairs of second weld spots 60 between sheetmetal 40 and utmost point shell 10, the connection stability between sheetmetal 40 and utmost point shell 10 is better, and simultaneously, the internal resistance of contact between sheetmetal 40 and utmost point shell 10 is little, does benefit to the discharge efficiency that improves the battery, and in addition, the welding operation between sheetmetal 40 and utmost point shell 10 is also more convenient.

Example 4

As shown in fig. 7, example 4 provides a button cell having a traceless welded structure, which is different from the button cell of example 1 in that: the connecting structure between the positive electrode shell 11 and the positive electrode tab 21 also adopts the button battery pole shell and electrode tab seamless welding structure of embodiment 1.

Generally, the electrode tabs are metal foils that can be bent at will.

Preferably, as shown in fig. 3, 5 and 6, in the button battery electrode shell and electrode tab seamless welding structure of the present invention, all the second welding spots 60 are uniformly distributed around the circumference with the center of the electrode shell 10 as the center of the circle. 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.

The utility model discloses a button cell further preferred is: the connecting structure between the negative electrode shell 12 and the negative electrode tab 22 adopts the button cell electrode shell and electrode tab seamless welding structure. Because the negative electrode shell 12 is mostly used as a bottom shell and the positive electrode shell 11 is mostly used as a top shell in the existing manufacturing process of the button battery, the battery cell 30 is firstly installed in the bottom shell, and then the top shell is arranged corresponding to the cover to assemble the battery, so that the operability is stronger by adopting the seamless welding structure of the button battery pole shell and the electrode pole ear between the negative electrode shell 12 and the negative pole ear 22.

With reference to fig. 1-3, the welding method for the button battery electrode shell and the electrode tab seamless welding structure of the utility model comprises the following steps:

s1: preparing a metal sheet 40, welding one end of the electrode tab 20 extending out of the battery core on the metal sheet 40, forming a first welding point 50 between the electrode tab 20 and the metal sheet 40, and then horizontally placing the metal sheet 40 in the electrode shell 10;

s2: pressing a metal sheet 40 on the inner surface of the electrode shell 10, respectively pressing two needle-shaped electrodes (100, 200) of resistance welding on different positions on the outer surface of the metal sheet 40 except the welding position of the metal sheet 40 and the electrode lug 20, and then electrifying the two needle-shaped electrodes in the step to realize the fixed connection of the electrode shell 10 and the metal sheet 40, wherein the welding step of the step S2 is carried out for 1 time or more, at least 1 pair of second welding points 60 are formed between the metal sheet 40 and the electrode shell 10, and the welding positions of the metal sheet 40 and the electrode shell 10 in different steps S2 can be overlapped; the outer contour line 40 'of the area covered by the metal sheet 40 on the pole casing 10 is located outside the outer contour line 34' of the area covered by the cell axial cavity 34, and the second welding point 60 is located on the metal sheet 40 outside the area covered by the cell axial cavity 34.

The utility model discloses a before the polar shell 10 is packed into at sheetmetal 40, weld on sheetmetal 40 with the one end that stretches out electric core 30 with electrode tab 20, and, after in the polar shell 10 is packed into at sheetmetal 40, the resistance welding mode through parallel welding welds sheetmetal 40 on polar shell 10 from polar shell 10 is inside, two needle-like electrodes (100, 200) of injecing resistance welding simultaneously equally divide do not carry out the welding operation at sheetmetal 40 and electrode tab 20 welding position outside the surface of sheetmetal 40, after two needle-like electrodes (100, 200) circular welding current channel can form between two needle-like electrodes (100, 200), welding current can not run through polar shell 10, make and only can form molten bath and solder joint in polar shell 10 inboard, thereby keep polar shell 10 outward appearance complete, stop because of the risk that the solder joint breaks and causes the battery weeping.

It should be noted that, when only one of the connection structure between the positive electrode shell 11 and the positive electrode tab 21 and the connection structure between the negative electrode shell 12 and the negative electrode tab 22 adopts the button cell electrode shell and electrode tab seamless welding structure, the other connection structure may also adopt any one of the existing connection modes that can realize the electrical connection between the electrode tab and the corresponding electrode shell, such as directly gluing the electrode tab on the corresponding electrode shell through conductive adhesive, or physically contacting the electrode tab with the corresponding electrode shell. In addition, the first welding spot of the present invention is not limited to 1 welding spot in the drawings, and it may be 2 or more than 2 welding spots. 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 (4)

1. A button battery with a traceless welding structure 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 opening and the lower opening of the positive electrode shell and the negative electrode shell are oppositely buckled to form a cylindrical button battery shell; a gap is reserved between the positive electrode shell and the negative electrode shell, the gap is filled with an insulating sealing ring 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 connecting structure is characterized in that at least one of the connecting structure between the positive electrode shell and the positive electrode lug and the connecting structure between the negative electrode shell and the negative electrode lug adopts a traceless welding structure, and the traceless welding structure is as follows: one end of the electrode lug extending out of the battery core is fixedly connected with the outer surface of a metal sheet through a first welding spot, the inner surface of the electrode shell is horizontally and fixedly provided with the metal sheet through a second welding spot, the number of the second welding spots is more than or equal to 1 pair, the second welding spots in different pairs can be overlapped, the two second welding spots in the same pair are arranged in a staggered mode, meanwhile, the first welding spot and the second welding spot are arranged in a staggered mode, the outer contour line of the metal sheet coverage area on the electrode shell is located outside the outer contour line of the battery core axial cavity coverage area, and the second welding spot is located on the metal sheet outside the battery core axial cavity coverage area.

2. The button cell with the traceless welding structure according to claim 1, wherein: and the connecting structure between the negative electrode shell and the negative electrode lug adopts a traceless welding structure.

3. Button cell with a traceless welded structure according to one of claims 1 or 2, characterized in that: all second welding points of the traceless welding structure are uniformly distributed around the circumference by taking the center of the polar shell as a circle center.

4. The button cell with the traceless welding structure according to claim 3, wherein: the second welding points of each pair of the traceless welding structures are symmetrically distributed.

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