CN212011037U - Battery shell structure and miniature column type lithium battery - Google Patents

Abstract

The application discloses battery case structure and miniature column type lithium cell. The battery shell structure comprises a battery cover, a sealing ring, a battery cup and a support ring. The battery cover includes an edge region. The sealing ring is arranged in the edge area and extends from the front surface of the edge area to the back surface of the edge area. The upper edge of the battery cup is folded inwards to form a pressing part, and the sealing ring is pressed on the front side of the edge area by the pressing part. The support ring is positioned in the battery cup, one end of the support ring is abutted against the bottom surface of the battery cup, and the other end of the support ring presses the sealing ring on the back surface of the edge area. The technical scheme that this application provided can solve current battery inner space and not obtain make full use of, the problem that battery capacity can't further improve.

Description

Battery shell structure and miniature column type lithium battery

Technical Field

The application relates to the technical field of batteries, in particular to a battery shell structure and a miniature column type lithium battery.

Background

The existing column type lithium battery is punched into a cylindrical shell by metal. Rolling the battery pole piece diaphragm into a column shape by a winding machine, placing the column shape into a cylinder shell, rolling a groove at one end of an opening, and then matching with a manufactured cap for welding, pressing and sealing. However, this method cannot fully utilize the internal space of the battery, and cannot increase the battery capacity as much as possible.

SUMMERY OF THE UTILITY MODEL

The application provides a battery case structure and miniature column type lithium cell, and it can solve current battery inner space and not obtain make full use of, the problem that battery capacity can't further improve.

In a first aspect, an embodiment of the present invention provides a battery case structure, including:

a battery cover including an edge region;

the sealing ring is arranged in the edge area and extends from the front side of the edge area to the back side of the edge area;

the upper edge of the battery cup is folded inwards to form a pressing part, and the sealing ring is pressed on the front side of the edge area by the pressing part; and

and the support ring is positioned in the battery cup, one end of the support ring is abutted against the bottom surface of the battery cup, and the other end of the support ring presses the sealing ring on the back surface of the edge area.

In the above-mentioned scheme, provide a battery shell structure, when using this battery shell structure to make the battery, the battery can make full use of battery shell structure's inner space, compare prior art, can further improve battery capacity. The battery shell structure comprises a battery cover, a sealing ring, a battery cup and a support ring. The sealing ring is arranged at the edge area of the battery cover and extends to the front and the back of the edge area, the support ring is positioned in the battery cup, and one end of the support ring is supported on the sealing ring positioned at the back of the battery cover. And pressing the upper edge of the battery cup to ensure that the pressing part formed on the upper edge of the battery cup is pressed on the sealing ring positioned on the front surface of the battery cover, so that the pressing part, the sealing ring positioned on the front surface of the battery cover, the sealing ring positioned on the back surface of the battery cover and the support ring jointly form a battery sealing line, namely, an internal space of the battery is defined among the battery cover, the support ring and the battery cup, and the space can be used for placing a battery pack storing electric energy. Because the sealing washer seals through the mode of the front and back pressfitting of battery cover, the area that the occupied area of the sealing washer is little than the area that the sealing washer among the prior art occupied, simultaneously, in this scheme, the sealing washer is in on the support ring, and it is footpath at the battery, can not cause the interference to the battery pack, so among the prior art, can improve the volume of battery pack to improve the battery capacity of battery.

In an alternative embodiment, the sealing ring is injection-molded onto the edge region.

In an alternative embodiment, the material of the sealing ring is modified or polymerized by at least one of polypropylene, polyetheretherketone and polyvinylidene fluoride.

In an alternative embodiment, the upper edge of the support ring is folded inwards to form a support which presses the sealing ring against the rear side of the edge region.

In an alternative embodiment, the cell cover includes a central region that is convex upward relative to the edge region.

In an alternative embodiment, the support ring has a thickness of 0.1mm to 0.5 mm.

In an alternative embodiment, the support ring has a thickness of 0.2 mm.

In a second aspect, an embodiment of the present invention provides a micro column type lithium battery, including a battery pack and the battery case structure according to any one of the foregoing embodiments;

the battery core assembly is positioned in the inner ring of the support ring, and at least one anode and at least one cathode of the battery core assembly are respectively and electrically connected with one of the battery cover and the battery cup.

In an alternative embodiment, the cell assembly includes a cell winding, and the positive and negative poles of the cell winding are welded to one of the cell cover and the cell cup, respectively.

In an alternative embodiment, the positive electrode of the cell winding includes one or more of lithium cobaltate, lithium cobalt nickel manganese oxide and lithium iron phosphate;

the negative pole of the battery cell winding comprises one or more of artificial graphite and natural graphite;

the isolating membrane of the cell winding comprises any one of polypropylene, polyethylene and polyimide.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural view of a micro column lithium battery in this embodiment;

FIG. 2 is a schematic structural diagram of a battery case structure according to the present embodiment;

FIG. 3 is a schematic structural diagram of a battery cover according to the present embodiment;

FIG. 4 is a schematic structural diagram of a battery cover with a gasket in the present embodiment;

FIG. 5 is a schematic structural view of a battery cup in the present embodiment;

FIG. 6 is a schematic structural diagram of the support ring in the present embodiment;

fig. 7 is a flowchart of a method for manufacturing the micro-post lithium battery of the present embodiment.

Icon: 10-an electrical core assembly; 11-a cell winding; 110-positive electrode; 111-negative electrode; 112-a barrier film;

20-battery housing structure; 21-battery cover; 21 a-a central region; 21 b-edge area; 22-a sealing ring; 23-a battery cup; 23 a-a nip; 24-a support ring; 24 a-support.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The technical solution in the present application will be described below with reference to the accompanying drawings.

This embodiment provides a miniature column type lithium cell, and this miniature column type lithium cell has make full use of battery inner space than current battery, improves the characteristics of battery capacity.

Referring to fig. 1 to 6, fig. 1 is a schematic structural view of a micro column lithium battery in the present embodiment, and fig. 2 is a schematic structural view of a battery case structure 20 in the present embodiment. Fig. 3 is a schematic structural diagram of the battery cover 21 in this embodiment. Fig. 4 is a schematic structural diagram of the battery cover 21 with the sealing ring 22 in this embodiment. Fig. 5 is a schematic structural view of the battery cup in this embodiment. Fig. 6 is a schematic structural diagram of the support ring 24 in this embodiment.

The miniature column type lithium battery comprises an electric core assembly 10 and a battery shell structure 20, wherein the electric core assembly 10 is positioned in the battery shell structure 20.

The battery housing structure 20 includes a battery cover 21, a gasket 22, a battery cup 23, and a support ring 24.

The battery cover 21 comprises a central area 21a and an edge area 21b, the central area 21a being upwardly convex with respect to the edge area 21b, wherein the convex central area 21a is capable of making good contact with a power consuming device, i.e. a device to which the battery supplies power. In other embodiments, the positional relationship of the central region 21a and the edge region 21b is not limited, for example, the central region 21a may be recessed relative to the edge region 21b, or flush.

The gasket 22 is disposed on the edge region 21b, and the gasket 22 extends from the front surface of the edge region 21b to the back surface of the edge region 21 b.

The upper edge of the battery cup 23 is folded inward to form a press-fit portion 23a, and the press-fit portion 23a presses the gasket 22 against the front surface of the rim area 21 b.

The support ring 24 is positioned in the cell cup 23, and has one end abutting against the bottom surface of the cell cup 23 and the other end pressing the seal ring 22 against the back surface of the rim area 21 b.

Referring to fig. 1, the cell assembly 10 is located in the inner ring of the support ring 24, and in the present embodiment, the cell assembly 10 includes a cell winding 11. The cell winding 11 is formed by winding a positive electrode 110, a negative electrode 111, and a separator 112. In this embodiment, the negative electrode 111 of the cell winding 11 is electrically connected to the battery cover 21, and the positive electrode 110 of the cell winding 11 is electrically connected to the bottom end of the battery cup 23.

The positive electrode 110 of the cell winding 11 includes one or more of lithium cobaltate, lithium cobalt nickel manganese oxide, and lithium iron phosphate. The negative electrode 111 of the cell winding 11 includes one or more of artificial graphite and natural graphite. The separator 112 of the cell winding 11 includes any one of polypropylene, polyethylene, and polyimide.

In the present embodiment, the negative electrode 111 of the cell winding 11 is welded to the battery cover 21, and the positive electrode 110 of the cell winding 11 is welded to the battery cup 23, so as to realize charging and discharging of the battery.

As can be seen in fig. 1, the weld between the negative pole 111 of the cell winding 11 and the battery cover 21 is denoted by "a", and the weld between the positive pole 110 of the cell winding 11 and the battery cup 23 is denoted by "B". In other specific embodiments, the positive electrode 110 of the cell winding 11 may be electrically connected to the battery cover 21, and the negative electrode 111 of the cell winding 11 may be electrically connected to the bottom end of the battery cup 23.

It should be noted that, since the cell assembly 10 includes the cell winding 11, the number of the positive electrode 110 and the negative electrode 111 is one.

In other embodiments, for example, the core assembly 10 includes a laminated cell formed by a positive electrode 110, a negative electrode 111 and a separator 112 through a lamination process, and having a plurality of positive electrodes 110 and a plurality of negative electrodes 111, all of the electrode plates of the same nature being attached to one of the battery cover 21 and the battery cup 23.

Referring to fig. 1, it can be seen that the cell assembly 10 is located in the battery case structure 20, and the sealing ring 22 does not affect the cell assembly 10 in the radial direction of the micro-column type lithium battery, so that the cell assembly 10 can store more electric energy than the prior art, thereby further improving the battery capacity than the prior art.

In the present embodiment, the sealing ring 22 is injection molded on the edge area 21b of the battery cover 21. The material of the sealing ring 22 is modified or polymerized by at least one of polypropylene, polyetheretherketone and polyvinylidene fluoride.

As shown in fig. 6, the upper edge of the support ring 24 is folded inward to form a support portion 24 a. The support portion 24a abuts on the gasket 22, and the gasket 22 is press-fitted to the back surface of the edge region 21 b.

The thickness of the support ring 24 is 0.1-0.5mm, wherein, when the thickness of the support ring 24 is 0.1mm, a larger volume of the cell housing structure 20 in the radial direction can be ensured. When the thickness of the support ring 24 is 0.5mm, the support ring 24 has better support strength, and the sealing strength among the battery cup 23, the seal ring 22, the battery cover 21 and the support ring 24 is ensured.

When a micro column type lithium battery with a diameter of 2-16mm and a thickness of 3-20mm is manufactured, the thickness of the support ring 24 may be 0.2 mm.

In the above-mentioned scheme, provide a miniature column type lithium cell, miniature column type lithium cell has battery case structure 20, and through battery case structure 20, the inner space of miniature column type lithium cell utilization battery case structure 20 that can be abundant, compare prior art, can further improve battery capacity. The battery housing structure 20 includes a battery cover 21, a gasket 22, a battery cup 23, and a support ring 24. The gasket 22 is disposed on the edge region 21b of the cell cover 21 and extends to the front and back of the edge region 21b, the support ring 24 is disposed in the cell cup 23, and one end of the support ring 24 is supported on the gasket 22 disposed on the back of the cell cover 21. The upper edge of the battery cup 23 is pressed, so that the pressing part 23a formed on the upper edge of the battery cup 23 is pressed on the sealing ring 22 positioned on the front surface of the battery cover 21, and thus the pressing part 23a, the sealing ring 22 positioned on the front surface of the battery cover 21, the sealing ring 22 positioned on the back surface of the battery cover 21 and the support ring 24 together form a battery sealing line, i.e., an internal space of the micro-column type lithium battery is defined among the battery cover 21, the support ring 24 and the battery cup 23, and the space is used for placing the battery assembly 10 storing electric energy. Because the sealing ring 22 is sealed by the front and back pressing of the battery cover 21, the area occupied by the sealing ring 22 is smaller than that occupied by the sealing ring 22 in the prior art, and meanwhile, the sealing ring 22 is positioned on the support ring 24 in the scheme and cannot interfere with the battery assembly in the radial direction of the battery, so that the size of the battery assembly can be increased compared with that in the prior art, and the battery capacity of the miniature column type lithium battery is increased.

The present embodiment also provides a method for manufacturing a battery.

Referring to fig. 7, fig. 7 is a flow chart of a method for manufacturing a micro column lithium battery.

The manufacturing method of the miniature column type lithium battery comprises the following steps:

a battery cover 21, a sealing ring 22, a support ring 24 and a battery cup 23 are provided, the battery cover 21 comprising an edge area 21b, the sealing ring 22 being provided at the edge area 21b, the support ring 24 being provided in the battery cup 23.

Providing the cell assembly 10, placing the cell assembly 10 in the cell cup 23, and electrically connecting at least one anode 110 and at least one cathode 111 of the cell assembly 10 to one of the cell cover 21 and the cell cup 23 respectively. In the step of providing the cell assembly 10, the cell assembly 10 includes a cell winding 11, the cell winding 11 is composed of a positive electrode 110, a negative electrode 111 and a separation film 112 in a winding manner, and the positive electrode 110 and the negative electrode 111 in the cell winding 11 are respectively welded to one of the cell cover 21 and the cell cup 23 through tabs. Wherein the tabs of the positive electrode 110 and the negative electrode 111 of the cell winding 11 are welded to one of the cell cover 21 and the cell cup 23 at the uncoated position by being folded to a proper length.

The battery cover 21 and the battery cup 23 are assembled, the upper edge of the battery cup 23 is folded inwards to form a pressing part 23a, and the pressing part 23a, the sealing ring 22 and the support ring 24 are pressed into a whole through a mold.

The sealing ring 22 may be injection molded on the edge area 21b of the battery cover 21. The battery cover 21, support ring 24, and battery cup 23 may be stamped or pressed from stainless steel.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A battery case structure, comprising:

a battery cover including an edge region;

the sealing ring is arranged in the edge area and extends from the front surface of the edge area to the back surface of the edge area;

the upper edge of the battery cup is folded inwards to form a pressing part, and the sealing ring is pressed on the front surface of the edge area by the pressing part; and

the support ring is positioned in the battery cup, one end of the support ring is abutted against the bottom surface of the battery cup, and the other end of the support ring presses the sealing ring on the back surface of the edge area.

2. The battery case structure according to claim 1,

the sealing ring is injection molded in the edge area.

3. The battery case structure according to claim 1,

the sealing ring is made of at least one material of polypropylene, polyether-ether-ketone and polyvinylidene fluoride through modification or polymerization.

4. The battery case structure according to claim 1,

the upper edge of the support ring is folded inwards to form a support part, and the support part presses the seal ring on the back of the edge area.

5. The battery case structure according to claim 1,

the cell cover includes a central region that is convex upward relative to the edge region.

6. The battery case structure according to claim 1,

the thickness of the support ring is 0.1mm-0.5 mm.

7. The battery case structure according to claim 6,

the thickness of support ring is 0.2 mm.

8. A micro pillar lithium battery comprising a battery cell assembly and the battery case structure of any one of claims 1 to 7;

the battery core assembly is positioned in the inner ring of the support ring, and at least one anode and at least one cathode of the battery core assembly are respectively and electrically connected to one of the battery cover and the battery cup.

9. The lithium micro-pillar battery according to claim 8,

the battery core assembly comprises a battery core winding, and the positive pole and the negative pole of the battery core winding are respectively welded on the battery cover and one of the battery cups.

10. The lithium micro-pillar battery according to claim 9,

the positive electrode of the battery core winding comprises one or more of lithium cobaltate, lithium cobalt nickel manganese oxide and lithium iron phosphate;

the negative pole of the battery cell winding comprises one or more of artificial graphite and natural graphite;

the isolating membrane of the battery core winding comprises any one of polypropylene, polyethylene and polyimide.

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