CN218448159U - Cylindrical battery - Google Patents

Abstract

The utility model relates to a battery technology field provides a cylinder battery, include: a battery case; the battery comprises a battery cell, a battery shell and a battery cover, wherein the battery cell is arranged in the battery shell and comprises a battery cell main body and a tab part, and the tab part extends out from at least one side of the battery cell main body; the first insulating film is arranged on the outer surface of the battery cell main body and is connected with the battery cell; the second insulating film is arranged on the outer surface of the battery cell main body, the second insulating film covers and is connected with the first insulating film, one end of the second insulating film is not lower than the end face of the battery cell main body provided with the lug part, the other end of the second insulating film is overlapped with the first insulating film, so that the part of the second insulating film is overlapped with the first insulating film, the second insulating film compresses the first insulating film, the insulating property of the first insulating film to the battery cell main body is improved, the constraint capacity of the battery cell main body is improved, the phenomenon that the first insulating film is loosened to cause insulation failure and the whole energy density of the battery is influenced by no internal pretightening force is avoided, and the service performance of the battery is improved.

Description

Cylindrical battery

Technical Field

The utility model relates to a battery technology field especially relates to a cylinder battery.

Background

In the related art, the outer surface of the battery core of the battery can be insulated and protected by the insulating film, and the insulating film is relatively poor in stability and easy to separate from the outer surface of the battery core due to the limitation of the connection mode of the insulating film.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cylindrical battery to improve the performance of battery.

The utility model provides a cylindrical battery, include:

a battery case;

the battery comprises a battery cell, a battery shell and a battery cover, wherein the battery cell is arranged in the battery shell and comprises a battery cell main body and a tab part, and the tab part extends out from at least one side of the battery cell main body;

the first insulating film is arranged on the outer surface of the battery cell main body and is fixedly connected with the battery cell;

and the second insulating film is arranged on the outer surface of the cell main body, covers at least part of the first insulating film and is fixedly connected with the first insulating film, one end of the second insulating film is not lower than the end face, provided with the lug part, of the cell main body, and the other end of the second insulating film is overlapped with the first insulating film, so that part of the second insulating film is overlapped with the first insulating film.

The utility model discloses the cylinder battery includes battery case, electric core, first insulating film and second insulating film, electric core sets up in battery case, the ear of a pole portion is extended to at least one side of electric core main part, realize the insulation protection to electric core main part through setting up first insulating film and second insulating film in electric core main part's surface, and cover first insulating film through the part with the second insulating film, and the one end of second insulating film is not less than the terminal surface that electric core main part was provided with ear of a pole portion, the other end and the first insulating film of second insulating film overlap mutually, on guaranteeing that the second insulating film realizes the basis of insulation protection, also can make the second insulating film compress tightly first insulating film, improve the insulating properties of first insulating film to electric core main part, and promote the constraint ability to electric core main part, avoid first insulating film to loosen and lead to insulating inefficacy and inside no pretightning force influence cylinder battery whole energy density, with this performance that improves cylinder battery.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram of a cylindrical battery according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating an exploded structure of a cylindrical battery according to an exemplary embodiment;

FIG. 3 is another schematic exploded view of a cylindrical battery according to an exemplary embodiment;

fig. 4 is a schematic diagram illustrating a partial structure of a cylindrical battery according to an exemplary embodiment.

The reference numerals are illustrated below:

10. a battery case; 11. a first housing member; 12. a second housing member; 20. an electric core; 21. a cell main body; 22. a lug portion; 30. a first insulating film; 40. a second insulating film; 50. the utmost point post subassembly.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and encompass, for example, a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood as a specific case by a person skilled in the art.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a cylindrical battery, please refer to fig. 1 to 4, the cylindrical battery includes: a battery case 10; the battery comprises a battery cell 20, the battery cell 20 is arranged in the battery shell 10, the battery cell 20 includes a cell main body 21 and a tab portion 22, and the tab portion 22 extends from at least one side of the cell main body 21; a first insulating film 30, wherein the first insulating film 30 is disposed on an outer surface of the cell main body 21 and is fixedly connected to the cell 20; and a second insulating film 40, wherein the second insulating film 40 is disposed on the outer surface of the cell main body 21, the second insulating film 40 covers at least a portion of the first insulating film 30 and is fixedly connected to the first insulating film 30, one end of the second insulating film 40 is not lower than the end surface of the cell main body 21 on which the lug portion 22 is disposed, and the other end of the second insulating film 40 overlaps the first insulating film 30, so that the portion of the second insulating film 40 overlaps the first insulating film 30.

The utility model discloses a cylindrical battery of an embodiment includes battery case 10, electric core 20, first insulating film 30 and second insulating film 40, electric core 20 sets up in battery case 10, utmost point ear's 22 is extended to at least one side of electric core main part 21, realize the insulation protection to electric core main part 21 through setting up first insulating film 30 and second insulating film 40 in the surface of electric core main part 21, and through covering first insulating film 30 with the part of second insulating film 40, and the one end of second insulating film 40 is not less than electric core main part 21 and is provided with the terminal surface of utmost point ear's 22, the other end of second insulating film 40 overlaps with first insulating film 30, on guaranteeing that second insulating film 40 realizes the basis of insulation protection, also can make second insulating film 40 compress tightly first insulating film 30, improve the insulating properties of first insulating film 30 to electric core main part 21, and the constraint ability to electric core main part 21 promotes, avoid first insulating film 30 to loosen and lead to the insulating inefficacy and inside no pretightning force influence cylindrical battery whole energy density, improve cylindrical battery's performance with this.

It should be noted that, the first insulating film 30 may cover the whole circumferential outer surface of the cell main body 21, so as to achieve reliable insulation protection of the cell main body 21, and may provide a pre-tightening force to the cell main body 21, and further, the second insulating film 40 is wound on the circumferential outer surface of the cell main body 21, that is, the second insulating film 40 is wound on the first insulating film 30, so that on the basis of providing insulation protection and constraint capability to the cell main body 21, the second insulating film 40 may be prevented from being separated from the cell main body 21, thereby ensuring that the cell main body 21 has sufficient insulation performance, and avoiding the risk of insulation failure between the cell main body 21 and the battery case 10. In some embodiments, it is not excluded that the first insulating film 30 may cover a part of the circumferential outer surface of the cell main body 21.

The first insulating film 30 may be fixedly connected to the battery cell 20, and at this time, the first insulating film 30 may be directly fixedly connected to the cell main body 21, for example, the first insulating film 30 may be adhesively connected to the cell main body 21, or the first insulating film 30 may be connected to the cell main body 21 through the second insulating film 40, for example, no adhesive layer may be provided between the second insulating film 40 and the cell main body 21, and the second insulating film 40 may be adhesively bonded to the first insulating film 30, and the second insulating film 40 may be directly adhesively bonded to the cell main body 21.

The second insulating film 40 is fixedly connected to the first insulating film 30, and the second insulating film 40 may be directly fixedly connected to the first insulating film 30, for example, the second insulating film 40 may be adhesively connected to the first insulating film 30, or the first insulating film 30 may be adhesively connected to the cell main body 21, and the second insulating film 40 may be adhesively connected to the first insulating film 30 without a glue layer interposed therebetween, and the second insulating film 40 may be adhesively bonded to the cell main body 21.

The battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The cell refers to a unit formed by winding or laminating a stacking part, wherein the stacking part comprises a first pole piece, a partition and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. And the polarities of the first pole piece and the second pole piece can be interchanged. The first pole piece and the second pole piece are coated with active materials.

The battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core. The first insulating film 30 covers the winding type battery core, and the second insulating film 40 covers the first insulating film 30, so that the first insulating film 30 is protected.

In one embodiment, the first insulating film 30 is adhesively connected to the battery cell 20, which not only is simple in connection manner and not easy to cause the cylindrical battery to accumulate larger diameters, but also can ensure the connection stability of the first insulating film 30 and the battery cell 20, thereby ensuring that the first insulating film 30 reliably protects the battery cell 20.

In one embodiment, the second insulating film 40 is bonded to the first insulating film 30, so as to simplify the connection manner between the second insulating film 40 and the first insulating film 30, and ensure reliable connection between the second insulating film 40 and the first insulating film 30, thereby ensuring that the constraint capability on the cell main body 21 is improved.

In one embodiment, the first insulating film 30 is adhesively connected to the cell 20, and the second insulating film 40 is adhesively connected to the first insulating film 30, so as to ensure reliable insulation protection of the cell body 21 by the first insulating film 30 and the second insulating film 40.

In one embodiment, one end of the second insulating film 40 is disposed beyond the end surface of the cell main body 21 where the tab portion 22 is disposed, so that a part of the second insulating film 40 is located outside the circumferential outer surface of the tab portion 22, thereby achieving circumferential protection of the tab portion 22, and to some extent, the second insulating film 40 may form insulation protection for the tab portion 22.

In one embodiment, one end of the second insulating film 40 is not lower than the end surface of the tab portion 22 away from the cell main body 21, that is, the second insulating film 40 can protect the entire circumferential outer surface of the tab portion 22, so as to ensure reliable insulation between the tab portion 22 and the battery case 10, thereby ensuring the safety performance of the battery.

The length of the end face of the second insulating film 40, which exceeds the end face of the cell main body 21, where the lug portion 22 is provided, is not less than the length of the lug portion 22, so that on the basis that the second insulating film 40 effectively protects the first insulating film 30, the second insulating film 40 can also protect the lug portion 22, and thus the insulating performance between the cell 20 and the battery case 10 is improved.

In one embodiment, one end of the second insulating film 40 is disposed beyond the end surface of the tab portion 22 to contact the battery case 10, so that the second insulating film 40 can maximally perform an insulating protection function, improving the internal safety of the battery.

In one embodiment, one end of the second insulating film 40 is bonded to the battery case 10, so as to improve the connection stability of the second insulating film 40, avoid the second insulating film 40 from falling off, and further improve the insulation protection of the second insulating film 40 and the first insulating film 30 on the battery cell 20.

In one embodiment, the overlapping area of the second insulating film 40 and the first insulating film 30 occupies 10% to 40% of the area of the circumferential outer surface of the cell main body 21, and on the basis of ensuring that the second insulating film 40 can play a role in fixing and protecting the first insulating film 30, the problem of an excessively large overlapping area of the second insulating film 40 and the first insulating film 30 can be avoided, and the influence on the overall space utilization rate of the battery due to an excessively large thickness can be avoided to a certain extent.

When the overlapping area of the second insulating film 40 and the first insulating film 30 is too small, the binding force between the second insulating film 40 and the first insulating film 30 is insufficient, and the first insulating film 30 may fall off and fail, and when the overlapping area of the second insulating film 40 and the first insulating film 30 is too large, the thickness of the whole inside of the battery case 10 may increase, and the space utilization rate of the whole battery may be affected.

The area of the second insulating film 40 overlapping the first insulating film 30 may occupy 10%, 11%, 12%, 15%, 18%, 20%, 21%, 25%, 26%, 28%, 30%, 31%, 32%, 35%, 38%, 39%, 40%, or the like of the area of the circumferential outer surface of the cell main body 21.

In one embodiment, the width of the second insulating film 40 overlapping the first insulating film 30 is 5mm to 30mm, so that the second insulating film 40 can provide sufficient constraint force for the first insulating film 30, prevent the first insulating film 30 from loosening or separating, and also prevent the problem that the second insulating film 40 has an excessively large area to increase an excessively large space inside the battery case 10. The width of the second insulating film 40 overlapping the first insulating film 30 may be considered as a dimension of the second insulating film 40 overlapping the first insulating film 30 along the direction in which the lug portion 22 extends from the cell main body 21.

The width of the second insulating film 40 overlapping the first insulating film 30 may be 5mm, 6mm, 8mm, 10mm, 15mm, 18mm, 19mm, 20mm, 22mm, 25mm, 26mm, 28mm, 29mm, or 30mm, and the like.

In one embodiment, the thickness of the first insulating film 30 is 0.02mm to 0.05mm, and thus, while ensuring reliable insulating performance of the first insulating film 30, it is possible to avoid a problem that the first insulating film 30 has an excessively large thickness and occupies an excessively large space, and to reduce the weight of the first insulating film 30.

The thickness of the first insulating film 30 may be 0.02mm, 0.025, 0.03, 0.035, 0.04, 0.045, 0.046, 0.048, 0.049, or 0.05mm, etc.

In one embodiment, the thickness of the second insulating film 40 may be 0.02mm to 0.05mm, and on the basis of ensuring that the second insulating film 40 reliably protects the first insulating film 30 and can achieve reliable insulating performance, the problem that the second insulating film 40 occupies too much space due to its excessive thickness can be avoided, and the weight of the second insulating film 40 can be reduced.

The thickness of the second insulating film 40 may be 0.02mm, 0.025, 0.03, 0.035, 0.04, 0.045, 0.046, 0.048, 0.049, 0.05mm, or the like.

In one embodiment, the thickness of the first insulating film 30 may be greater than the thickness of the second insulating film 40, so as to improve the insulating performance of the first insulating film 30 on the cell body 21 and improve the constraint capability on the cell body 21, and the second insulating film 40 does not increase the diameter of the cylindrical battery too much, so as to ensure that the cylindrical battery has a higher volumetric energy density.

In some embodiments, it is not excluded that the thickness of the first insulating film 30 may be equal to the thickness of the second insulating film 40.

In one embodiment, the adhesion strength of the first insulating film 30 is greater than that of the second insulating film 40, so that the first insulating film 30 can be reliably bonded to the cell body 21, and the second insulating film 40 can also be easily bonded to the first insulating film 30, thereby ensuring that the second insulating film 40 can protect the first insulating film 30.

The first insulating film 30 may effectively wrap the cell body 21, thereby providing a sufficient restraining force to the cell body 21, and the first insulating film 30 may be prevented from being detached from the cell body 21, while the second insulating film 40 is mainly aimed at protecting the first insulating film 30, and therefore, the bonding strength of the second insulating film 40 may be relatively small, thereby facilitating reliable bonding of the second insulating film 40 to the cell body 21.

The adhesion strength of the first insulating film 30 is greater than that of the second insulating film 40, i.e., the peel force of the first insulating film 30 is greater than that of the second insulating film 40. The second insulating film 40 can be detached from the first insulating film 30, thereby facilitating replacement of the second insulating film 40.

In some embodiments, it is not excluded that the adhesive strength of the first insulating film 30 is equal to that of the second insulating film 40.

In one embodiment, the second insulating film 40 is formed with an overlapping region, so that the second insulating film 40 can be made to form a circumferentially closed space, thereby improving the protection capability of the second insulating film 40 against the first insulating film 30, avoiding the risk of detachment and the like of the first insulating film 30.

The second insulating film 40 is formed with an overlapping region, that is, the second insulating film 40 may have a first end and a second end, and the first end may be covered by the second insulating film 40, so that the second insulating film 40 is formed with the overlapping region, not only efficient protection of the first insulating film 30 may be achieved, but also the insulating protection capability of the second insulating film 40 may be improved.

In one embodiment, the width of the overlapping region is 0.2mm to 5mm, and it is possible to prevent the second insulating film 40 from being excessively increased in thickness on the basis of ensuring that the second insulating film 40 can have reliable connection strength and a restraining force, thereby reducing the overall weight of the battery.

The width of the overlap region may be 0.2mm, 0.3mm, 0.5mm, 1mm, 1.2mm, 1.3mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.2mm, 4.3mm, 4.5mm, 4.8mm, 4.9mm, or 5mm, and so forth.

In one embodiment, the first insulating film 30 is a first tape, and the second insulating film 40 is a second tape, so that the first insulating film 30 can be reliably bonded to the cell body 21, and the second insulating film 40 can be reliably bonded to the first insulating film 30, thereby improving the insulation protection ability of the first insulating film 30 and the second insulating film 40, and ensuring the safety use performance of the battery.

The first insulating film 30 has a glue layer adhered to the cell body 21, and the second insulating film 40 has a glue layer adhered to the first insulating film 30.

In one embodiment, the tab portion 22 includes a positive tab and a negative tab, which extend from the same side of the cell main body 21. Anodal utmost point ear and negative pole utmost point ear extend with one side by electric core main part 21 and can improve the inside whole space utilization of battery, and can be so that anodal utmost point ear and negative pole utmost point ear connect respectively and lie in battery case 10 anodal utmost point post and the negative pole utmost point post with one side, or, anodal utmost point ear and negative pole utmost point ear connect respectively battery case 10 and utmost point post, and battery case 10 draws forth the end as an electrode of battery, can make things convenient for the connection of follow-up battery when in groups, and battery case 10 area is great relatively, can guarantee to have reliable overcurrent area when battery is in groups, with this whole charge-discharge rate of assurance battery.

In certain embodiments, it is not excluded that the positive and negative electrode tabs may extend from opposite sides of the cell body 21.

It should be noted that, the positive electrode tab and the negative electrode tab can be a plurality of, and the positive electrode tab and the negative electrode tab can be arranged in a staggered manner, so as to ensure the insulation performance between the positive electrode tab and the negative electrode tab. Alternatively, the positive electrode tab and the negative electrode tab may be one.

In one embodiment, as shown in fig. 1 to 3, the battery case 10 includes: a first housing part 11; the second housing part 12, the second housing part 12 being connected to the first housing part 11, in order to achieve effective protection of the electrical core 20.

In one embodiment, the first housing member 11 is a cover plate, the tab portions 22 extend toward the cover plate, the second housing member 12 may be formed with a receiving space, the second insulating film 40 may be attached to the first housing member 11, and the cover plate may be provided to facilitate the assembly of the battery. In some embodiments, the first and second case members 11 and 12 may each be formed with a receiving space.

The first housing member 11 may be provided with a pole assembly 50, and the pole assembly 50 and the battery housing 10 may be electrically connected to two different polarity pole ear portions 22, respectively. The pole assembly 50 and the battery case 10 may be directly connected to the two tab portions 22 with different polarities, or the pole assembly 50 and the battery case 10 may be connected to the two tab portions 22 with different polarities through two current collecting plates, respectively.

The first case member 11 comprises steel and the second case member 12 comprises steel. Alternatively, the first shell member 11 comprises aluminum and the second shell member 12 comprises aluminum. The first shell piece 11 may comprise a composite metal material, for example, the first shell piece 11 may comprise a copper aluminum composite material, and the second shell piece 12 may comprise a composite metal material, for example, the second shell piece 12 may comprise a copper aluminum composite material.

The first and second case members 11, 12 may be welded, or the first and second case members 11, 12 may be riveted.

An embodiment of the utility model also provides a group battery, including foretell cylinder battery.

The utility model discloses a group battery of embodiment includes cylindrical battery, cylindrical battery includes battery housing 10, electric core 20, first insulating film 30 and second insulating film 40, electric core 20 sets up in battery housing 10, at least one side of electric core main part 21 extends utmost point ear 22, realize the insulation protection to electric core main part 21 through setting up first insulating film 30 and second insulating film 40 in the surface of electric core main part 21, and through the part with second insulating film 40 cover first insulating film 30, and the one end of second insulating film 40 is not less than the terminal surface that electric core main part 21 was provided with utmost point ear 22, the other end of second insulating film 40 overlaps with first insulating film 30, on guaranteeing that second insulating film 40 realizes the basis of insulation protection, also can make second insulating film 40 compress tightly first insulating film 30, improve the insulating properties of first insulating film 30 to electric core main part 21, and to the constraint ability promotion of electric core main part 21, avoid first insulating film 30 to loosen and lead to the insulating inefficacy and inside no pretightning force influence the whole energy density of cylindrical battery, use performance of group battery with this improvement.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of cylinder batteries, and the battery module can also include the bracket, and the cylinder battery can be fixed in on the bracket.

The battery pack comprises a plurality of cylindrical batteries and a box body, and the box body is used for fixing the cylindrical batteries.

It should be noted that, the battery package includes the cylinder battery, and the cylinder battery can be a plurality of, and a plurality of cylinder batteries set up in the box. Wherein, a plurality of cylinder batteries can form and install in the box behind the battery module. Or, a plurality of cylinder batteries can directly set up in the box, need not to carry out in groups a plurality of batteries promptly, utilize the box to fix a plurality of batteries.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (15)

1. A cylindrical battery, comprising:

a battery case (10);

the battery cell (20), the battery cell (20) is disposed in the battery casing (10), the battery cell (20) includes a cell main body (21) and a tab portion (22), and the tab portion (22) extends from at least one side of the cell main body (21);

the first insulating film (30), the first insulating film (30) is arranged on the outer surface of the battery core main body (21), and is fixedly connected with the battery core (20);

a second insulating film (40), wherein the second insulating film (40) is disposed on an outer surface of the cell main body (21), the second insulating film (40) covers at least a portion of the first insulating film (30) and is fixedly connected to the first insulating film (30), one end of the second insulating film (40) is not lower than an end surface of the cell main body (21) on which the tab portion (22) is disposed, and the other end of the second insulating film (40) overlaps the first insulating film (30), so that a portion of the second insulating film (40) overlaps the first insulating film (30).

2. The cylindrical battery according to claim 1, wherein the first insulating film (30) is adhesively connected to the battery cell (20) and/or the second insulating film (40) is adhesively connected to the first insulating film (30).

3. The cylindrical battery according to claim 1, wherein one end of the second insulating film (40) is disposed beyond an end face of the cell main body (21) at which the tab portion (22) is disposed.

4. The cylindrical battery according to claim 3, wherein one end of the second insulating film (40) is not lower than an end face of the lug part (22) away from the cell main body (21).

5. The cylindrical battery according to claim 4, wherein one end of the second insulating film (40) is disposed beyond an end face of the tab portion (22) to be in contact with the battery case (10).

6. The cylindrical battery according to claim 5, wherein one end of the second insulating film (40) is bonded to the battery case (10).

7. The cylindrical battery according to any one of claims 1 to 6, wherein an area of the second insulating film (40) overlapping the first insulating film (30) occupies 10% to 40% of an area of a circumferential outer surface of the cell main body (21).

8. The cylindrical battery according to any one of claims 1 to 6, wherein the width of the overlap of the second insulating film (40) and the first insulating film (30) is 5mm to 30mm.

9. The cylindrical battery according to any one of claims 1 to 6, wherein the thickness of the first insulating film (30) is greater than the thickness of the second insulating film (40).

10. The cylindrical battery according to any one of claims 1 to 6, wherein the thickness of the first insulating film (30) is 0.02mm-0.05mm.

11. The cylindrical battery according to any one of claims 1 to 6, wherein the adhesive strength of the first insulating film (30) is greater than the adhesive strength of the second insulating film (40).

12. The cylindrical battery according to claim 1, wherein the second insulating film (40) is formed with an overlapping region;

wherein the width of the overlapping area is 0.2mm-5mm.

13. The cylindrical battery according to any one of claims 1 to 6, wherein the pole ear portion (22) comprises a positive pole tab and a negative pole tab, and the positive pole tab and the negative pole tab extend from the same side of the cell main body (21).

14. The cylindrical battery according to any one of claims 1 to 6, wherein the first insulating film (30) is a first tape and the second insulating film (40) is a second tape.

15. The cylindrical battery according to any one of claims 1 to 6, wherein the battery case (10) comprises:

a first housing part (11);

a second housing part (12), the second housing part (12) being connected to the first housing part (11);

wherein the first housing part (11) is a cover plate, the pole lug (22) extending towards the cover plate.

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