CN218498292U - Battery with a battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and proposes a battery, comprising: a battery case; an electric cell, the electric cell is arranged in the battery case, the electric cell includes a main body of the electric cell and an ear part, and the ear part is formed by the main body of the electric cell. At least one side extends out; an insulating film, the insulating film covers the main body of the electric core, and covers at least part of the tab part, and at least part of the insulating film and the tab part is not provided with an adhesive layer. The insulating film covers the main body of the cell and the tabs at the same time, so that the insulating film can realize the insulation protection of the cell, and the covering of the tabs with the insulating film can reduce the false contact between the tabs and the battery case. To ensure the safe use of the battery, at least part of the insulating film and the tab part is not provided with an adhesive layer. On the basis of ensuring that the insulating film realizes the insulation protection of the tab part, the tearing of the insulating film on the tab part can be reduced The risk of cracking can further improve the safe use performance of the battery.

Description

Battery

technical field

The utility model relates to the technical field of batteries, in particular to a battery.

Background technique

In the related art, the tabs on the main body of the battery cell are mostly exposed. When the battery is in use, there is a possibility that the tabs will come into contact with other conductive structures by mistake, which will cause safety problems.

Utility model content

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

The utility model provides a battery, comprising:

battery case;

A battery cell, the battery cell is arranged in the battery case, the battery cell includes a battery cell body and a tab part, and the tab part extends from at least one side of the battery cell body;

An insulating film, the insulating film covers the main body of the electric core, and covers at least part of the tab part, and at least part of the insulating film and the tab part is not provided with an adhesive layer.

The battery of the embodiment of the utility model includes a battery casing, a battery cell and an insulating film, the battery cell is provided with an insulating film, and the battery cell is installed in the battery casing. The insulating film covers the main body of the cell and the tabs at the same time, so that the insulating film can realize the insulation protection of the cell, and the covering of the tabs with the insulating film can reduce the false contact between the tabs and the battery case. To ensure the safe use of the battery, at least part of the gap between the insulating film and the tab is not provided with an adhesive layer. On the basis of ensuring that the insulating film achieves insulation protection for the tab, it can reduce the tearing of the insulating film on the tab. The risk of cracking can further improve the safe use performance of the battery.

Description of drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following figures. 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, related elements or components may be arranged differently as known in the art. In addition, in the drawings, the same reference numerals denote the same or similar components in the respective drawings.

in:

Fig. 1 is a schematic structural view of a battery according to an exemplary embodiment;

Fig. 2 is a schematic diagram of a partial internal structure of a battery according to an exemplary embodiment;

Fig. 3 is a schematic diagram of a partial structure of an insulating film and a cell of a battery according to an exemplary embodiment;

Fig. 4 is a schematic diagram of a partial structure of an insulating film, a cell and an adapter piece of a battery according to an exemplary embodiment.

The reference signs are explained as follows:

10. Battery casing; 20. Battery core; 21. Battery core body; 211. First surface; 212. Second surface; 22. Tab part; 221. First bending area; 222. Second bending area ; 30, an insulating film; 40, an adapter piece; 50, a pole assembly.

Detailed ways

The following will clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only, and are not intended to limit the protection scope of the present disclosure, so it should be understood that various modifications can be made to the exemplary embodiments without departing from the protection scope of the present disclosure. modifications and changes.

In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "plurality" is means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" or "an" are likewise intended to mean one of a possible plurality of such objects.

Unless otherwise specified or explained, the terms "connected" and "fixed" should be interpreted in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or integral connection, or electrical connection, or Connection; "connection" can be a direct connection or an indirect connection through an intermediary. Those skilled in the art can understand the specific meanings of the above terms in the present disclosure according to specific situations.

Furthermore, in the description of the present disclosure, it should be understood that the orientation words such as "upper", "lower", "inner" and "outer" described in the exemplary embodiments of the present disclosure are based on the angles shown in the drawings It should not be construed as limiting the example embodiments of the present disclosure. It also needs to be understood that in this context, when an element or feature is referred to as being "on," "under," or "inside" or "outside" another element(s), it is not only a direct connection In other (one or more) elements "on", "under" or "inside", "outside", it can also be indirectly connected to another (one or more) elements "on", "under" or "outside" through intermediate elements inside and outside".

An embodiment of the present utility model provides a battery, please refer to Fig. 1 to Fig. 4, the battery includes: a battery case 10; The main body 21 and the tab part 22, the tab part 22 extends from at least one side of the cell main body 21; the insulating film 30, the insulating film 30 covers the cell main body 21, and covers at least part of the tab part 22, and the insulating film At least a portion between 30 and the lug portion 22 is not provided with an adhesive layer.

The battery in one embodiment of the present invention includes a battery case 10 , a cell 20 and an insulating film 30 , the cell 20 is provided with the insulating film 30 , and the cell 20 is installed in the battery case 10 . The insulating film 30 covers the cell main body 21 and the tab part 22 at the same time, so that the insulating film 30 realizes the insulation protection for the cell 20, and the insulating film 30 covering the tab part 22 can reduce the contact between the tab part 22 and the battery case. 10, so as to ensure the safe performance of the battery, and at least part of the insulating film 30 and the tab part 22 is not provided with an adhesive layer, so as to ensure that the insulating film 30 realizes the insulation protection of the tab part 22 Basically, the risk of tearing the tab part 22 by the insulating film 30 can be reduced, thereby further improving the safe performance of the battery.

It should be noted that the insulating film 30 can cover at least part of the cell main body 21, and the insulating film 30 can also cover at least part of the tab part 22, and the insulating film 30 can realize reliable insulation of the cell main body 21 and the battery case 10 , and reliable insulation of the tab portion 22 and the battery case 10 .

At least a portion between the insulating film 30 and the tab portion 22 is not provided with an adhesive layer, that is, at least a part of the insulating film 30 can be roughly overlapped on the tab portion 22, so that the installation of the tab portion 22 and other structures Or during the use of the battery, the tearing risk of the insulating film 30 to the tab portion 22 will be reduced to the minimum, thereby avoiding the risk of tearing the tab portion 22 and producing more metal shavings, thereby ensuring the safety performance of the battery.

In one embodiment, the position where the tab portion 22 is connected to the cell body 21 is covered with an insulating film 30 without an adhesive layer, that is, the insulating film 30 covers the position where the tab portion 22 is connected to the cell body 21 There will be no glue layer, and the position where the tab part 22 is connected to the cell main body 21 is the most likely to cause a tear risk to the tab part 22, because the insulating film 30 is connected to the tab part 22 and the cell main body 21 There is no adhesive layer at the position, which can minimize the pulling of the insulating film 30 at this position, thereby avoiding the risk of tearing the tab part 22 and producing more metal chips, so as to ensure the safe use performance of the battery .

The tab part 22 can be formed by extending from one side of the cell main body 21. Therefore, it can be considered that the tab part 22 is connected to the cell main body 21. At this time, the connection position between the tab part 22 and the cell main body 21 is the closest It is easy to be pulled, but in this embodiment, the insulating film 30 needs to cover this connection position, but no glue layer is provided, so that the tearing of the insulating film 30 to the tab part 22 can be avoided, and the insulating film 30 can be realized. Insulation protection for the tab part 22 .

In one embodiment, as shown in FIG. 2 and FIG. 3 , the tab part 22 includes a plurality of single-piece tabs extending from one side of the battery core body 21, and the tabs are formed after the multiple single-piece tabs are folded together. part 22 to form a first bending area 221 on the side close to the main body 21 of the cell; wherein, the insulating film 30 covers the first bending area 221, and no glue is provided between the insulating film 30 and the first bending area 221 Layer, so as to prevent the insulating film 30 from pulling the first bending region 221, so as to ensure that the insulating film 30 can effectively insulate and protect the tab part 22, and also prevent the insulating film 30 from tearing the first bend. Fold area 221 .

A plurality of single-piece tabs are folded to form the tab portion 22, and the first bending area 221 can be considered as the connection position between the tab portion 22 and the battery core body 21. Therefore, the first bending area 221 is the easiest to form a pull. However, in this embodiment, no adhesive layer is provided between the insulating film 30 and the first bending region 221 , which can effectively prevent the insulating film 30 from tearing the first bending region 221 , thus ensuring the safe use of the battery.

It should be noted that the cell main body 21 may include more than two pole pieces, and the tab portion 22 includes more than two single-piece tabs, the single-piece tabs respectively extend from the corresponding pole pieces, and the single-piece poles The width of the ear can be smaller than the width of the pole piece, and a plurality of single piece tabs are stacked to form the tab portion 22 , or the width of the single piece tab can be equal to the width of the pole piece. Wherein, the monolithic tab is made of metal foil with good electrical and thermal conductivity, such as aluminum, copper or nickel.

Batteries consist of cells and electrolytes, the smallest unit capable of performing electrochemical reactions such as charging/discharging. The battery core refers to a unit formed by winding or laminating a stacked part, and the stacked part includes a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein, the polarities of the first electrode and the second electrode can be interchanged.

The battery is a stacked battery, which is not only convenient for grouping, but also can be processed to obtain a battery with a long length. Specifically, the battery cell 20 is a laminated battery cell, and the battery cell 20 has a first pole piece stacked on each other, a second pole piece electrically opposite to the first pole piece, and a pole piece arranged between the first pole piece and the second pole piece. The separator sheets between them, so that multiple pairs of the first pole piece and the second pole piece are stacked to form a laminated battery cell.

Optionally, the battery can be a wound battery, that is, the first pole piece, the second pole piece that is electrically opposite to the first pole piece, and the separator disposed between the first pole piece and the second pole piece are rolled winding to obtain a wound-type battery cell.

In one embodiment, as shown in FIG. 2 and FIG. 3 , the tab portion 22 is further formed with a second bending region 222 , and the second bending region 222 is located on the side of the first bending region 221 away from the cell main body 21 ; Wherein, the insulating film 30 covers the second bending region 222 , so that the insulating film 30 can maximize the protection of the tab portion 22 .

The formation of the second bending area 222 can reduce the length of the tab portion 22 along the length direction of the cell main body 21, thereby reducing the space occupied by the tab portion 22 in the length direction, which can not only save the internal space of the battery case 10 , and can also prevent the end of the tab portion 22 from forming an electrical connection with the battery case 10 . The insulating film 30 covers the second bending region 222 , which can further prevent the tab portion 22 from being electrically connected to the battery case 10 .

In one embodiment, at least a portion between the first bending region 221 and the second bending region 222 is covered with an insulating film 30 without an adhesive layer, so as to prevent the insulating film 30 from pulling the tab portion 22, so as to This ensures that the insulating film 30 will not tear the tab portion 22, thereby improving the safe performance of the battery.

It should be noted that the entire portion of the tab portion 22 located between the first bending region 221 and the second bending region 222 may be covered with the insulating film 30 not provided with an adhesive layer. Alternatively, a portion of the tab portion 22 between the first bending region 221 and the second bending region 222 may be covered with an insulating film 30 that is not provided with an adhesive layer. For example, the insulating film 30 covers the tab portion 22 near the first The part of the bending area 221 is not provided with an adhesive layer, and the part of the insulating film 30 covering the tab part 22 close to the second bending area 222 can be provided with an adhesive layer, and on the basis of realizing the fixing of the insulating film 30, the insulation can be reduced. Risk of the membrane 30 tearing the tab 22 .

In one embodiment, as shown in FIG. 2 and FIG. 4 , the battery further includes an adapter piece 40, the adapter piece 40 is arranged on the battery case 10, the insulating film 30 covers the adapter piece 40, and the insulating film 30 is formed by the adapter piece. One end of the sheet 40 is bent to form a second bending region 222, thereby ensuring that the tab portion 22 reliably covers at least part of the adapter sheet 40, and can increase the contact area between the tab portion 22 and the adapter sheet 40, so as to This improves the current flow capacity of the tab portion 22 and the adapter piece 40 , thereby improving the safe use performance of the battery.

The insulating film 30 covers the side of the tab part 22 away from the adapter piece 40, so as to ensure that the insulating film 30 can cover the tab part 22, ensure the insulation of the tab part 22, and prevent the tab part 22 from bending to produce metal Chips affect the overall safety of the battery.

As shown in FIG. 2 , after the tab portion 22 extends from the side of the cell main body 21 , the tab portion 22 can be bent at one end of the adapter piece 40 , so that the tab portion 22 covers the adapter piece 40 , that is, a part of the tab portion 22 is located inside the adapter sheet 40. At this time, the insulating film 30 can cover at least the part of the tab portion 22 below the adapter sheet 40, so as to avoid the generation of metal shavings when the tab portion 22 is bent. , so as to improve the insulating protection performance of the insulating film 30 .

In one embodiment, the insulating film 30 is bonded to the adapter piece 40, so that the connection stability of the insulating film 30 can be ensured, so that the insulating film 30 can reliably cover the tab portion 22, thereby ensuring that the tab portion 22 and the Insulation performance between battery cases 10 .

As shown in FIG. 4 , one end of the insulating film 30 can be in contact with the adapter piece 40 . At this time, an adhesive layer can be arranged between the insulating film 30 and the adapter piece 40 , so as to ensure the connection between the insulating film 30 and the adapter piece 40 . The connection is formed stably. At this time, no adhesive layer may be provided between the insulating film 30 and the tab portion 22, but it can still ensure that the insulating film 30 reliably covers the tab portion 22. Of course, in some embodiments, it is not excluded A part of the insulating film 30 may also be bonded to the tab portion 22 .

In one embodiment, the insulating film 30 and the tab part 22 are bonded, that is, a part of the insulating film 30 may be provided with an adhesive layer between the tab part 22, but the adhesive layer is far away from the tab part 22 and the battery core. At the position where the main body 21 is connected, on the basis of ensuring that the insulating film 30 is stably arranged on the tab portion 22 , it is also possible to prevent the insulating film 30 from tearing the tab portion 22 .

In one embodiment, the insulating film 30 is bonded to the main body 21 of the electric core, which not only ensures the connection stability of the insulating film 30, but also enables the insulating film 30 to form an effective insulation protection for the main body 21 of the electric core, and further ensures insulation. The film 30 can reliably cover the tab portion 22 .

In one embodiment, as shown in FIG. 2 , the cell main body 21 includes two first surfaces 211 opposite to each other and four second surfaces 212 surrounding the first surfaces 211. The area of the first surfaces 211 is larger than that of the second surfaces. The area of the surface 212; wherein, the insulating film 30 covers at least one first surface 211, and the tab part 22 extends from the second surface 212, so that the insulating film 30 can also protect the main body 21 of the electric core. The insulation protection of the tab part 22 can be effectively realized, and the electrical connection between the battery cell 20 and the battery case 10 can be avoided.

It should be noted that the two opposite first surfaces 211 are large surfaces of the cell body 21, and the four second surfaces 212 are small surfaces of the cell body 21, and the four second surfaces 212 include two pairs of small surfaces, That is, the first pair of small surfaces extending along the length direction of the cell main body 21, and the second pair of small surfaces extending along the width direction of the cell main body 21, and the area of the first pair of small surfaces is greater than that of the second pair of small surfaces area, but smaller than the area of the large surface. The two tabs 22 can respectively extend from the second pair of small surfaces.

Correspondingly, the battery case 10 may also include two large surfaces and four small surfaces, and the two large surfaces of the battery case 10 and the two large surfaces of the cell main body 21 are arranged oppositely, and the four large surfaces of the battery case 10 The small surface is opposite to the four small surfaces of the cell main body 21 .

When the single-piece tab of the tab part 22 is flattened, the single-piece tab is parallel to the first surface 211, and the insulating film 30 can cover the tab part 22, so that the insulating film 30 can effectively realize the alignment between the tab part 22 and the battery. Insulation protection between shells 10.

In one embodiment, the insulating film 30 may be PET tape or PI tape, etc., for example, the insulating film 30 may be blue PET tape.

In one embodiment, there are two tabs 22, and the two tabs 22 respectively extend from opposite sides of the battery core body 21; wherein, the insulating film 30 extends from one tab 22 to the other. The ear portion 22 can improve the assembly efficiency of the insulating film 30 , and can ensure that the insulating film 30 can be reliably fixed on the cell main body 21 , and can further ensure that the insulating film 30 can form reliable insulation protection for the two tabs 22 .

In some embodiments, the two tabs 22 may extend from the same side of the cell main body 21 .

It should be noted that the insulating film 30 can be an integral structure, that is, one insulating film 30 can cover the cell main body 21 and the tab part 22 at the same time, or the insulating film 30 can include at least two separate structures, and the separate The structure of the body set is connected.

In one embodiment, as shown in FIG. 1 , the battery further includes: a pole assembly 50, the pole assembly 50 is connected to the adapter piece 40, and a part of the pole assembly 50 is located outside the battery case 10; wherein, the pole The assembly 50 is disposed on the large surface of the battery case 10 , so that the large surface of the battery case 10 can provide sufficient supporting force for the pole assembly 50 , thereby ensuring the stability of the pole assembly 50 . The pole assembly 50 is connected to the adapter piece 40, and the adapter piece 40 is connected to the tab part 22, so that the pole assembly 50 can be used as an electrode lead-out end of the battery. The pole assembly 50 and the adapter piece 40 can be welded, or the pole assembly 50 and the adapter piece 40 can be riveted.

In some embodiments, as shown in FIG. 1, there are two pole assemblies 50, and the two pole assemblies 50 are respectively a positive pole assembly and a negative pole assembly, and each pole assembly 50 may include two poles, for In order to increase the overcurrent capacity of the battery, there are also two tabs 22, the two tabs 22 are positive tabs and negative tabs respectively, the positive pole assembly is connected to the positive tab, and the negative post assembly is connected to the negative tab.

It should be noted that the pole assembly 50 and the battery case 10 can be insulated. For example, an insulator can be used for insulation between the two, or an insulating coating can be used for insulation, which is not limited here. Choose according to actual needs.

In one embodiment, the battery case 10 may include a first case part and a second case part, and the second case part is connected with the first case part to enclose the battery cell 20; wherein, the first case part The part may be a flat plate, and the second case part may be formed with an accommodating chamber, or both the first case part and the second case part may be formed with an accommodating chamber.

In one embodiment, the material of the battery case 10 can be stainless steel or aluminum, which has good corrosion resistance and sufficient strength. The battery case 10 is substantially rectangular.

It should be noted that, the first shell part and the second shell part can be set independently. In some embodiments, it is not excluded that the first shell part and the second shell part may be an integral structure, and the space for accommodating the electric core 20 is formed by stamping, and then sealed and connected by welding.

The battery can be a square battery, that is, the battery can be a quadrangular prism battery. The quadrangular prism battery mainly refers to the shape of a prism, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense. The corners between sides are not It must be a right angle, and it can be a circular arc transition.

In one embodiment, the length of the battery is a, 400mm≤a≤2800mm, the width of the battery is b, and the height of the battery is c, 2b≤a≤80b, and/or, 0.5c≤b≤20c.

Further, 80mm≤b≤200mm, 10mm≤c≤100mm.

Preferably, 4b≤a≤25b, and/or, 2c≤b≤10c.

In the battery in the above embodiment, under the condition of ensuring sufficient energy density, the ratio of the battery length to the width is relatively large, and further, the ratio of the battery width to the height is relatively large.

In one embodiment, the length of the battery is a, the width of the battery is b, 4b≤a≤7b, that is, the ratio of the length to the width of the battery in this embodiment is relatively large, so as to increase the energy density of the battery and facilitate subsequent A battery pack is formed.

In one embodiment, the height of the battery is c, 3c≤b≤7c, and the ratio of the width to the height of the battery is relatively large, which is convenient to form while ensuring sufficient energy density.

Optionally, the length of the battery may be 800mm-1800mm, the width of the battery may be 80mm-180mm, and the height of the battery may be 15mm-35mm.

It should be noted that the length of the battery is the dimension in the direction of the battery length, the width of the battery is the dimension in the direction of the width of the battery, and the height of the battery is the dimension in the direction of the height of the battery, that is, the thickness of the battery.

An embodiment of the present invention also provides a battery pack, which includes the above-mentioned battery.

The battery pack in one embodiment of the present invention includes a battery. The battery includes a battery case 10 , a battery cell 20 and an insulating film 30 . The battery cell 20 is provided with the insulating film 30 . The insulating film 30 covers the cell main body 21 and the tab part 22 at the same time, so that the insulating film 30 realizes the insulation protection for the cell 20, and the insulating film 30 covering the tab part 22 can reduce the contact between the tab part 22 and the battery case. 10, so as to ensure the safe performance of the battery, and at least part of the insulating film 30 and the tab part 22 is not provided with an adhesive layer, so as to ensure that the insulating film 30 realizes the insulation protection of the tab part 22 Basically, the risk of tearing the tab part 22 by the insulating film 30 can be reduced, thereby further improving the safe use performance of the battery pack.

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

The battery module includes a plurality of batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries.

It should be noted that multiple batteries can form a battery module and be placed in the battery case, and multiple batteries can be fixed by end plates and side plates. A plurality of batteries can be directly arranged in the battery case, that is, there is no need to group a plurality of batteries, and at this time, the end plates and side plates can be removed.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the utility model innovation disclosed herein. This disclosure is intended to cover any modification, use or adaptation of the present utility model, and these modifications, uses or adaptations follow the general principles of this disclosure and include common knowledge or conventional techniques in the technical field not disclosed in this disclosure means. The specification and example embodiments are to be considered as exemplary only, with the true scope and spirit of the disclosure indicated by the appended claims.

It should be understood that the present disclosure is not limited to the precise constructions which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of protection of the present disclosure is limited only by the appended claims.

Claims (11)

1. A battery, comprising:

a battery case (10);

the battery comprises a battery core (20), wherein the battery core (20) is arranged in the battery shell (10), the battery core (20) comprises a battery core main body (21) and a pole lug part (22), and the pole lug part (22) extends out from at least one side of the battery core main body (21);

the insulation film (30) covers the battery core main body (21) and at least a part of the lug part (22), and a glue layer is not arranged on at least a part between the insulation film (30) and the lug part (22).

2. The battery according to claim 1, wherein the positions where the tab portions (22) and the cell main body (21) are joined are covered with the insulating film (30) without a glue layer.

3. The battery of claim 2, wherein the tab portion (22) comprises a plurality of single tabs extending from one side of the cell body (21), and the plurality of single tabs are gathered to form the tab portion (22) so as to form a first bending region (221) at a side close to the cell body (21);

wherein the insulating film (30) covers the first bending region (221), and no glue layer is arranged between the insulating film (30) and the first bending region (221).

4. The battery according to claim 3, wherein the tab portion (22) is further formed with a second bending region (222), and the second bending region (222) is located on a side of the first bending region (221) away from the cell main body (21);

wherein the insulating film (30) covers the second bending region (222).

5. The battery according to claim 4, wherein at least a portion between the first bending region (221) and the second bending region (222) is covered with the insulating film (30) which is not provided with a glue layer.

6. The battery according to claim 4, further comprising an interposer (40), wherein the interposer (40) is disposed in the battery case (10), the insulating film (30) covers the interposer (40), and the insulating film (30) is bent from one end of the interposer (40) to form the second bending region (222).

7. The battery according to claim 6, wherein the insulating film (30) is bonded to the interposer (40).

8. The battery according to any one of claims 2 to 7, wherein the insulating film (30) and the tab portion (22) are bonded to each other.

9. The battery according to any one of claims 1 to 7, wherein the insulating film (30) is bonded to the cell main body (21).

10. The battery of any of claims 1 to 7, wherein the cell body (21) comprises two oppositely disposed first surfaces (211) and four second surfaces (212) disposed around the first surfaces (211), and the area of the first surfaces (211) is larger than that of the second surfaces (212);

wherein the insulating film (30) covers at least one of the first surfaces (211), and the lug portion (22) extends from the second surface (212).

11. The battery according to any one of claims 1 to 7, wherein the number of the tab portions (22) is two, and the two tab portions (22) extend from two opposite sides of the cell main body (21);

wherein the insulating film (30) extends from one of the lug portions (22) to the other of the lug portions (22).

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