WO2019178895A1

WO2019178895A1 - Integrally formed electrode structure and battery top cap

Info

Publication number: WO2019178895A1
Application number: PCT/CN2018/081927
Authority: WO
Inventors: 王有生; 丁朝阳; 丁坤
Original assignee: 深圳市瑞德丰精密制造有限公司
Priority date: 2018-03-22
Filing date: 2018-04-04
Publication date: 2019-09-26
Also published as: CN108305982A

Abstract

Provided are an integrally formed electrode structure and a battery top cap, relating to the technical field of electrode columns. The electrode structure comprises electrode columns (121) respectively fixed to two ends of a battery top cap (11) in a penetrating manner and conductive sheets (122) located at a lower end portion of the battery top cap, wherein a lower end of the electrode column is connected to the conductive sheet; the electrode column and the conductive sheet are integrally formed; and the sides, facing away from each other, of the conductive sheets located at two sides of the battery top cap are respectively bent downwards to form an electrode lug (123) connected to a battery cell inside the battery. With the conductive sheets and the electrode columns in the battery top cap being integrated, the electrode columns are stably fixed. The conductive sheets at lower ends of the electrode columns abut against the battery top cap to prevent the electrode columns from moving, and are directly electrically connected to the battery cell inside the battery via the electrode lugs, which are formed by means of bending the conductive sheets downwards, thus omitting the welding of additional conductive sheets. That is, directly by means of extending the electrode columns of the electrode structure to connect the electrode columns are connected to the battery cell inside the battery, the structure is more stable, and at the same time, the required thickness of the battery is reduced, i.e., the cost required for the battery is reduced.

Description

One-piece electrode structure and battery top cover

Technical field

The invention relates to the technical field of electrode columns, in particular to an integrally formed electrode structure and a battery top cover.

Background technique

At present, with the increasing miniaturization, portability, and portability of electronic products, such as cameras, notebooks, and mobile phones, the driving power of these electronic products is also developing toward high capacity, high security, and light weight. Lithium batteries are Its high capacity and other excellent characteristics are widely used in electronic products.

The lithium battery comprises a casing, a cover sheet, a battery core and the like, wherein the electric core is disposed inside the casing, the upper end of the casing has an upper end opening, and the top cover piece is closed at an opening of the upper end of the casing, and the top cover piece is The terminal is provided with an electrode column, and the electrode column is connected to the battery cell in the housing through the conductive sheet to supply power to the outside.

However, in the prior art, the electrical connection between the battery cell and the electrode post is made through the transmission of the conductive sheet. Such an intermediate structure facilitates the connection between the electrode column and the battery core, but at the same time, the size of the battery is also increased. The capacity of the battery is reduced, and the conductive sheet is fixed on the electrode column by soldering. If the soldering is not strong, the battery is easily broken, and the battery is discarded.

technical problem

The integrally formed electrode structure and the battery top cover proposed by the present invention are intended to solve the problem that the electrode column and the conductive sheet are not fixed in the prior art.

Technical solution

The present invention is achieved by integrally forming an electrode structure including an electrode post fixed at both ends of the battery cover and a conductive sheet at a lower end of the battery cover, the lower end of the electrode column and the The conductive sheets are connected, and the electrode columns are integrally formed with the conductive sheets, and the opposite sides of the conductive sheets on the two sides are respectively bent downward to form a tab connected to the battery cells inside the battery.

Further, the poles on both sides respectively have an outer end portion facing away from each other, and two sides of the outer end portion of the tab are respectively extended outward to form a welding ear.

Further, a corner position between the welding ear and the tab is provided with a plurality of corner holes.

Further, the inside of the pole has a cavity with an opening facing downward, the cavity penetrating to the conductive sheet and opening at a lower end portion of the conductive sheet.

Further, the battery top cover has a pole hole through which the electrode column is fixed, an electrode boss is formed on an outer circumference of a lower end portion of the electrode column, and the electrode protrusion is formed in the pole hole. The electrode recess of the table.

Further, the electrode boss has a rectangular parallelepiped shape, and the electrode recess is a rectangular parallelepiped cavity that fits the electrode boss.

Further, an insulating plate is disposed at a lower end portion of the battery cover, and the conductive sheet abuts on the insulating plate.

Further, the lower end portion of the insulating plate is formed with a fixing rib which surrounds the outer circumference of the conductive sheet and is open on a side where the conductive sheet is bent to be a tab.

Further, the fixing ribs extend downwardly on both sides of the tabs to have a latching structure for fixing the tabs.

Further, the engaging structure includes a bent strip formed on the fixed ribs on both sides of the tab and bent toward each other, and the bent strips on both sides are respectively formed with a notch, and the tabs are Both sides pass through the gap.

Beneficial effect

Compared with the prior art, the integrally provided electrode structure and the battery top cover provided by the present invention are obtained by abutting the conductive sheet against the lower end portion of the battery top cover, and the conductive sheet is integrated with the electrode column in the battery top cover, thereby Stabilizing the fixed electrode column, the conductive sheet at the lower end of the electrode column abuts against the top cover of the battery to prevent the electrode column from moving, and the pole formed by the downward bending of the conductive sheet is electrically connected with the battery core inside the battery, thereby eliminating the need for another Soldering the conductive sheet, that is, directly extending through the electrode column of the electrode structure to connect with the battery core inside the battery, the structure is more stable, and the thickness required for the battery is reduced, the volume of the battery can be reduced, or the battery can be increased. Capacity reduces the cost of the battery. The problem that the electrode column and the conductive sheet are not fixed stably in the prior art is solved.

DRAWINGS

1 is a perspective view showing the integrally formed electrode structure and the lower end portion of the battery top cover according to an embodiment of the present invention;

2 is a partially enlarged schematic view showing the integrally formed electrode structure and the three-dimensional structure of the battery top cover according to an embodiment of the present invention;

3 is a schematic perspective structural view of an integrally formed electrode structure according to an embodiment of the present invention;

4 is a schematic perspective structural view of an integrally formed electrode structure according to an embodiment of the present invention;

5 is a perspective view showing the integrally formed electrode structure and the upper end portion of the battery top cover according to an embodiment of the present invention;

6 is a schematic cross-sectional structural view of an integrally formed electrode structure and a battery top cover according to an embodiment of the present invention;

7 is a partially enlarged schematic view showing an integrally formed electrode structure and a cross-sectional structure of a battery top cover according to an embodiment of the present invention;

FIG. 8 is a schematic exploded perspective view of the integrally formed electrode structure and the battery top cover of the battery top cover according to the embodiment of the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The implementation of the present invention will be described in detail below with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", etc. The orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplified description, rather than indicating or implying that the device or component referred to has a specific orientation, in a specific orientation. The terms used to describe the positional relationship in the drawings are for illustrative purposes only and are not to be construed as limiting the invention. For those skilled in the art, the specific meaning of the above terms may be understood on a case-by-case basis.

Referring to Figures 1 through 8, a preferred embodiment of the present invention is provided.

The integrally formed electrode structure and the battery top cover provided in this embodiment are fixed to the two ends of the battery top cover 11 through the integrally formed electrode structure, and the battery core is extended on the side of the conductive sheet 122. The connected tabs 123 are integrally formed and more secure, and the external conductive sheets 122 are omitted, which reduces the volume of the battery and increases the capacity of the battery.

The integrally formed electrode structure provided in this embodiment includes an electrode post 121 fixedly disposed at two ends of the battery top cover 11 and a conductive sheet 122 located at a lower end portion of the battery top cover 11. The upper end of the electrode post 121 passes through the battery top cover 11 The upper end portion is electrically connected to the outside, and the lower end portion of the electrode post 121 is flush with the lower end portion of the battery top cover 11 and connected to the conductive sheet 122. The electrode post 121 is integrally formed with the conductive sheet 122, and the upper end portion of the conductive sheet 122 is formed. Then, the lower end portion of the electrode post 121 is followed, and at the same time, the opposite sides of the conductive sheets 122 on both sides are bent downward to form the tabs 123 connected to the cells inside the battery.

Thus, the conductive sheet 122 is abutted against the lower end portion of the battery top cover 11, and the conductive sheet 122 is integrated with the electrode post 121 in the battery top cover 11, thereby stabilizing the fixed electrode post 121, and passing through the conductive sheet 122 at the lower end of the electrode post 121. Abutting the battery top cover 11 prevents the electrode column 121 from moving, and the tab 123 formed by bending the conductive sheet 122 downward is electrically connected to the battery core inside the battery, thereby eliminating the need to additionally solder the conductive sheet 122. In the example, the electrode structure 12 directly passing through the electrode structure 12 is extended to connect with the cell inside the battery, the structure is more stable, and the thickness required for the battery is reduced, the volume of the battery can be reduced, or the capacity of the battery can be increased. , reducing the cost of the battery.

In this embodiment, the tabs 123 on the two sides have opposite end portions respectively, and the two sides of the outer end of the tab 123 extend outwardly to form soldering ears 124, that is, on both sides of the battery core. A collector tab is provided, and the collector tab is electrically connected to the battery core, so that the collector tabs on both sides of the battery core are soldered to the soldering lugs 124 on both sides of the tabs 123 to realize electrical connection between the electrode post 121 and the battery core. After the welding tab is welded to the welding lug 124, the welding lugs 124 on both sides are bent toward each other, so that the welding lugs 124 on both sides are folded on the tabs 123, so that the above-mentioned collector tabs are pressed. It is disposed between the tab 123 and the soldering lug 124, so that the connection between the tab 123 and the collecting tab is more stable and stable.

In addition, a plurality of corner holes are provided at a corner position between the welding lug 124 and the tab 123, so that the current collecting tab is welded to the welding lug 124 through the position of the corner hole to facilitate welding, and at the same time, the corner hole is disposed at At the corner position of the tab 123 and the welding lug 124, it is easier to bend the welding lug 124.

Moreover, when the current collecting tab is welded to the welding lug 124, when the current inside the battery is too large, due to the existence of the corner hole, the welding ear 124 and the tab 123 are relatively thin, and when an excessive current passes, The fuse is blown to form an open circuit between the tab 123 and the soldering lug 124 to protect the battery

Moreover, the middle portion of the tab 123 is thicker than the two sides, so that the tab 123 is more stable and difficult to bend, and the welding lug 124 is more easily bent to be folded with the tab 123.

A limiting protrusion is protruded outward in the middle of the lower end of the tab 123. Thus, when the welding ear 124 is bent, the bending position of the welding ear 124 is restricted, so that the welding ear 124 is more stably folded.

In addition, in the embodiment, the cavity has a cavity with an opening facing downward, and the cavity penetrates to the conductive sheet 122 and is opened at the lower end of the conductive sheet 122. Thus, the present embodiment can be directly obtained by extrusion molding. In the example of the pole, and the inside of the pole has a cavity, the volume of the pole is reduced, that is, the weight of the battery is reduced at the same time, and the cost is greatly saved.

In this embodiment, in order to obtain the integrally formed electrode structure, the outer contour of the electrode structure 12 is first cut by shear molding, and then the electrode column 121 is extruded by extrusion molding, and the electrode structure is formed by bending molding. The tabs 123 of the 12 are bent out, and at the same time, the welder ears on the tabs 123 are bent out, which can be directly obtained through a series of physical forming methods, and can be mass-produced through a combination of various molds, and the production is faster. The cost is greatly reduced, the manufacturing cycle is reduced, and the electrode structure 12 after the completion of the fabrication is directly installed in the battery, so that the conductive piece 122 is not required to be externally welded, and the installation is more convenient.

In addition, in the battery top cover 11 provided in this embodiment, the battery top cover 11 has a pole hole through which the electrode column 121 is fixed, and an electrode boss 125 is formed on the outer periphery of the lower end portion of the electrode column 121, and a pole post is formed in the pole hole. The electrode recess is embedded in the electrode boss 125, so that the electrode post 121 is embedded in the pole hole, and the electrode boss 125 is completely embedded in the electrode recess to fix the electrode post 121 to prevent the electrode post 121 from moving.

At the same time, the electrode boss 125 has a rectangular parallelepiped shape, and the electrode recessed table is a rectangular parallelepiped cavity that fits the electrode boss 125. Thus, the electrode boss 125 has an edge and is engaged with the electrode recessed table to prevent the battery from being used during use. The electrode post 121 is twisted, which causes damage inside the battery, and the electrode post 121 is more firmly stuck.

In this embodiment, the battery top cover 11 includes an insulating plate 111 at a lower end portion of the battery top cover 11 and a conductive plate 112 at an upper end portion of the battery top cover 11, and the conductive sheet 122 abuts on the insulating plate 111, so that The electrode post 121 is integrated with the conductive sheet 122, and the conductive sheet 122 at the lower end of the electrode post 121 abuts against the insulating plate 111, thereby making the electrode post 121 more stable.

In addition, a fixing rib 1111 is formed at a lower end portion of the insulating plate 111. The fixing rib 1111 surrounds the outer circumference of the conductive sheet 122, and is opened at a side where the conductive sheet 122 is bent to form the tab 123, so that the conductive sheet 122 is fixed. In the slot formed by the rib 1111, the conductive sheet 122 is stably placed, and in the embodiment, the conductive sheet 122 is a rectangular sheet body, so that the fixing rib 1111 abuts against the three edges of the conductive sheet 122, further preventing The integrally formed structure is twisted to make the interior of the battery more integrated and less prone to deformation.

At the same time, in order to stabilize the integrally formed structure, the fixing ribs 1111 extend downwardly on both sides of the tabs 123 with a locking structure for fixing the tabs 123, so that the electrode structure 12 of the electrode structure 12 is stuck on the top of the battery. In the pole hole of the cover 11, the tab 123 in the electrode structure 12 is caught by the above-mentioned snap-in structure, so that the electrode structure 12 can be stably stuck inside the battery and is not easily displaced.

Specifically, the above-mentioned card-insertion structure includes a bent strip 1112 formed on the fixed ribs 1111 on both sides of the tabs 123 and bent toward each other, and the two sides of the bent strips 1112 are respectively formed with a notch, and two of the tabs 123 The side passes through the notch, that is, by providing a notch on both sides of the tab 123 for the tab 123 to pass through, and the two sides of the tab 123 are caught by the bent strip 1112, so that the bent strip 1112 is kept with the conductive sheet. 122 is in a vertical position for soldering to the collector tabs on both sides of the cell.

In the embodiment, the upper end portions of the two ends of the battery top cover 11 are respectively provided with insulating sheets 113, and the insulating sheets 113 on the two sides are respectively provided with riveting pieces 114, and the above-mentioned pole holes are made of insulating plates 111. The conductive plate 112, the insulating sheet 113 and the rivet piece 114 are formed together, and an insulating rubber pad is disposed on the insulating plate 111 at a position of the pole hole. The insulating rubber pad enables the electrode post 121 to be more closely fitted. It is not easy to move in the pole hole.

In addition, the first electrode post 1211, the first riveting piece 1141, and the first insulating sheet 1131 on the side of the battery top cover 11 are located on the other side of the battery top cover 11 as a second electrode post 1222 and a second guiding riveting. In the above structure, the first insulating sheet 1131 electrically isolates the first electrode post 1211 from the conductive plate 112, and the second electrode post 1222 is electrically connected to the conductive plate 112, and Below the first insulating sheet 1131, an inverting sheet 115 is provided on the conductive plate 112, and is opened at the first insulating sheet 1131 directly above the inverting sheet 115, so that when the pressure inside the battery is excessively large, the sheet 115 is turned over. Inverting, the flip chip 115 is touched to the first riveting tab 1141 above the first insulating sheet 1131. Since the first riveting tab 1141 is electrically connected to the first electrode post 1211, the first electrode post 1211 and the second electrode are The electrode post 1222 is electrically turned on to cause a short circuit to prevent the battery from continuing to operate, thereby protecting the inside of the battery.

The first insulating sheet 1131 has a fixing plate that is fastened to the conductive plate 112 above the flipping plate 115. The fixing plate has a cavity at a lower end portion of the fixing plate 112. The opening of the conductive plate 112 above the flipping plate 115 is convex upward. The fixing plate is fastened to the opening convex position of the conductive plate 112, and the two are clearance-fitted to fix the position of the insulating sheet 1131, and the insulating sheet 1131 is stably fixed by riveting the upper end portion of the first electrode post 1211.

Thus, the first insulating sheet 1131 and the first rivet sheet 1141 together form a rectangular parallelepiped cavity of the electrode boss 125 of the first electrode post, and the first insulating sheet 1131 has a rectangular hole upwardly and has a rectangular parallelepiped shape. The first rivet piece 1141 is inserted into the rectangular hole of the first insulating piece 1131, and is riveted and fixed by the upper end portion of the first electrode column 1211, such that the first insulating piece 1131, the first rivet piece 1141, and the first electrode column 1211 The mutual clamping position further improves the anti-torsion performance of the electrode post 121, and the connection of the electrode post 121 is more stable.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, and improvements made within the spirit and scope of the present invention should be included in the scope of the present invention. Inside.

Claims

An integrally formed electrode structure, comprising: an electrode post fixedly disposed at two ends of the battery top cover; and a conductive sheet located at a lower end portion of the battery cover, wherein a lower end of the electrode column is connected to the conductive sheet The electrode column is integrally formed with the conductive sheet, and the sides of the conductive sheets on the two sides facing away from each other are bent downward to form a tab connected to the battery core inside the battery.
The integrally formed electrode structure according to claim 1, wherein the tabs on both sides respectively have outwardly facing ends, and the outer ends of the tabs are respectively extended outwardly. Welding ears.
The integrally formed electrode structure according to claim 2, wherein a plurality of corner holes are provided at a corner position between the welding ear and the tab.
The integrally formed electrode structure according to claim 1, wherein the inside of the pole has a cavity with an opening facing downward, the cavity penetrating to the conductive sheet, and at a lower end of the conductive sheet Opening.
The battery top cover according to any one of claims 1 to 4, wherein the battery top cover has a pole hole through which the electrode column is fixed, and an electrode is formed on an outer circumference of a lower end portion of the electrode column. In the boss, an electrode recess embedded in the electrode boss is formed in the pole hole.
The battery cover according to claim 5, wherein the electrode boss has a rectangular parallelepiped shape, and the electrode recess is a rectangular parallelepiped cavity that fits the electrode boss.
A battery cover according to any one of claims 1 to 4, comprising an insulating plate at a lower end portion of said battery can, said conductive sheet abutting on said insulating plate.
The battery cover according to claim 7, wherein a lower end portion of the insulating plate is formed with a fixing rib, and the fixing rib surrounds an outer circumference of the conductive sheet, and the conductive sheet is bent at a pole One side of the ear is open.
The battery cover according to claim 8, wherein said fixing ribs extend downwardly on both sides of said tabs to have a latching structure for fixing said tabs.
A battery cover according to claim 9, wherein said engaging structure comprises a bent strip formed on said fixed ribs on both sides of said tab and bent toward each other, said bent on both sides A notch is formed in each of the strips, and both sides of the tab pass through the notch.