KR20170041357A - Secondary Battery Comprising a Planned Breaking Part and Method for Preparing the Same - Google Patents

Abstract

The present invention provides a battery cell in which an electrode assembly composed of a positive electrode, a negative electrode, and a separator is embedded in a battery case. When the electrode assembly is divided into two parts by applying an external impact to the battery cell, a first planned breaking unit in which a first divided part is partially pushed, and a second planned breaking unit in which a second divided part is partially pushed are individually formed in the battery case so as to enable divided parts of the divided electrode assembly to be pushed to the outside by breaking the battery case.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a secondary battery including a predetermined portion to be ruptured,

The present invention relates to a battery cell, and more particularly, to a battery cell in which, when an external impact is applied to a battery cell to divide the electrode assembly, two divided parts to be ruptured, A battery cell formed in a pouch-shaped battery case, and a method of manufacturing the same.

As technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries capable of meeting various demands have been conducted.

Particularly in terms of the shape of the battery, there is a high demand for a prismatic secondary battery and a pouch type secondary battery which can be applied to products such as mobile phones with a thin thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

Such a lithium secondary battery has safety problems such as ignition or explosion due to various conditions such as overcharging, overdischarge and external impact, and therefore, a safety test is performed to prevent the safety.

These safety tests include electrical tests such as continuous charge test, over discharge / overcharge test, forced discharge test, overcurrent charge test, short circuit test, Thermal stability tests such as mechanical tests such as simulation tests, high temperature and low temperature storage tests, and temperature cycling tests.

Among the above tests, the impact test is a test simulating explosion or ignition due to a short circuit inside the battery when the battery is impacted by a round bar, and a safety test when various members collide with the battery in the device to be.

In this way, various external impacts can be applied to the lithium secondary battery. At this time, internal short-circuiting occurs due to deformation of the electrode assembly, and the internal temperature of the lithium secondary battery rises due to the continuous reaction, resulting in explosion or ignition.

In particular, in the case of a pouch-type secondary battery in which an electrode assembly is embedded in a laminate sheet and its shape is easily controlled, it has a flexible outer shape and is advantageous to be applied to various devices, but is vulnerable to external shock, There was a disadvantage that happened.

Therefore, there is a high need for a technique for securing the safety of a lithium secondary battery so as to prevent such a risk.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

Specifically, it is an object of the present invention to provide a battery case in which an external impact is applied to a battery cell so that when the electrode assembly is divided into two, an internal short circuit is not caused by mutual contact between the first separator and the second separator, 1 separator is pushed out, and a second tearable portion for pushed out of the second separator is formed.

It is still another object of the present invention to provide a method of manufacturing a battery cell in which the tearable portion is formed in the process of pressing the laminate sheet with a molding jig during the manufacture of the pouch type battery cell and the tearable portion is formed without any additional process will be.

According to an aspect of the present invention, there is provided a battery cell including an electrode assembly including a cathode, a cathode,

A first rupture preventive part and a second rupture preventive part, in which the first separator is partially pushed out so that the separators of the nested electrode assembly can be pushed out when the external impact is applied to the battery cell and the electrode assembly is bisected 2 separator is partially protruded from the battery case.

The pouch-shaped battery case may be formed of a laminate sheet including a resin layer and a metal layer.

That is, the battery cell according to the present invention is a pouch-shaped battery cell in which an electrode assembly is embedded in a pouch-shaped battery case made of a laminate sheet, and when the external impact is applied, safety is improved by preventing ignition or explosion due to an internal short circuit .

Internal shorting of the battery may occur in a variety of situations, but in one specific example, a bar shaped component may be caused by an external impact in the adjacent state.

At this time, the electrode assembly can be divided into the first separator and the second separator, and the anode of the first separator and the cathode of the second separator come into contact with each other to generate an internal short circuit. Explosion takes place.

The present invention has a first rupture preventive part in which the first separator is partly pushed out into the battery case so that the separators of the electrode assembly thus divided are not in contact with each other but can be pushed out, And a second tear-off portion that comes out.

Although the positions of the tearable portions are not particularly limited, it is preferable that the first tearable portion and the second tearable portion are formed at positions facing each other with respect to the center of the battery cell.

That is, the tearable portions may be formed at opposite positions so that the separators of the electrode assembly can be easily pushed out.

In one specific example, the battery case receiving portion on which the electrode assembly is mounted has a rectangular parallelepiped shape surrounded by rectangular faces;

A pair of first faces having relatively largest areas and located on opposite faces;

A pair of second faces adjacent to the long sides of the first faces and located on opposite sides of the first faces; And

A pair of third faces adjacent to the short sides of the first faces and located on opposite faces;

Lt; / RTI >

At this time, the positive electrode terminal and the negative electrode terminal may be located together at the long side or the short side of the first surfaces, or may be positioned opposite to each other.

In addition, the first tearable portion and the second tornable portion of the present invention may be located on opposite sides of each other.

That is, when the housing portion of the battery case has the shape of a rectangular parallelepiped surrounded by rectangular faces, the first and second planned rupture portions are formed on each of the first faces, on each of the second faces, or on each of the third faces Can be.

The first separator and the second separator, which are thus divided, can be pushed out to the outside by the rupture planned portions formed on the opposite surface.

Specifically, the first tearable portion and the second tearable portion may be formed on the third surfaces, respectively

Even if the electrode assembly is divided into two by the external impact, it is difficult to induce the separators to be pushed out without mutual contact when the tearable portions are formed on the first surfaces having a relatively large area.

Therefore, it is preferable that the tearable portions are formed on the second or third surfaces having a relatively small area in the rectangular parallelepiped-shaped storage portion.

In addition, since the electrode assembly having the shape of a rectangular parallelepiped corresponding to the accommodating portion of the battery case is easily separated around the longer side, the planned rupture portions are respectively formed on the second faces adjacent to the long sides of the first faces On the third sides, which are adjacent to the short sides of the first sides, to prevent mutual contact of the separators.

On the other hand, the shape of the tearable portions is not particularly limited as long as the tearable portions are easily ruptured so that the separators can be pushed out when an external impact is applied. For example, the shape of the tearable portions may be various shapes such as comb, radial, have.

Specifically, each of the first tearable portion and the second tearable portion may be formed in a comb-shaped structure having a plurality of linear grooves.

The comb-like structure may have a shape in which the linear grooves are arranged in a plane and parallel to each other, and the shape in which the linear grooves are arranged in a plane is not particularly limited.

The specific shape of the tearing planes will be described in more detail later in the drawings.

The linear grooves may be formed at a depth of 5% to 40% based on the thickness of the battery case, and more specifically, 10% to 35%, and more specifically, 15% to 30% .

If the depth of the linear grooves exceeds 40% and the depth of the linear grooves exceeds the above range, the planned tear portion ruptures even if the impact is too small, which is undesirable. If the depth is less than 5%, it is difficult to achieve the desired object.

The linear grooves may be formed at an angle of 30 to 90 degrees with respect to the end of the facing electrode assembly.

If the angles of the linear grooves are less than 30 degrees with respect to the ends of the electrode assembly, the intended tear may rupture even with too small impact, as is the case with deep depths of the grooves. That is, it is preferable that the comb-shaped rupture-tending portion secures a predetermined angle or more with respect to the end portion of the electrode assembly so that a certain degree of impact can be dispersed, and more specifically, it may be formed at an angle of 90 degrees.

Each of the first tearable portion and the second tearable portion may have an area of 50% to 100% based on the total area of the third surface.

If the area of the tearable portions is less than 50% based on the total area of the third surface, even if the electrode assembly is divided by the external impact, it is difficult to secure a space in which the separable bodies can be pushed out, It may be difficult to rupture.

Meanwhile, the battery case may be further provided with a third predetermined portion to be ruptured at a central portion of the battery cell.

The third tearable portion may be formed at a central portion of the battery cell by predetermining a region where the electrode assembly is bisected, and assists the first and second tearable portions.

The present invention also provides a method of manufacturing the battery cell,

(i) preparing an electrode assembly composed of an anode, a cathode, and a separator interposed between the anode and the cathode;

(ii) preparing a battery case having an electrode assembly receiving portion and a tearable portion having a shape corresponding to the electrode assembly; And

(iii) sealing the electrode assembly housing part after mounting the electrode assembly in the housing part and injecting the electrolyte solution;

The method comprising the steps of:

Specifically, the process (i) is a process of preparing an electrode assembly. The electrode assembly may be classified into a jelly-roll type, a stack type, and a stack / folding type according to a structure, for example.

The jelly-roll type (wound type) electrode assembly is a structure in which a long sheet type anode and negative electrodes are wound with a separator interposed therebetween. A stacked (laminate) electrode assembly includes a plurality of positive electrodes and negative electrodes And a structure in which layers are sequentially stacked with a separator interposed therebetween.

In recent years, electrode assemblies of the jelly-roll type and the stack type have been proposed, in which unit cells stacked in a state in which a predetermined unit of positive and negative electrodes are stacked with a separator interposed therebetween are sequentially wound on a separator film A stack / folding type electrode assembly is also used, and a battery cell according to the present invention may be used with an electrode assembly having such a variety of structures.

Next, the process (ii) is a process of preparing a battery case having an electrode assembly receiving portion and a tearable portion.

In one specific example, the process (ii) may comprise the following steps:

(a) preparing a forming mold having a shape corresponding to the electrode assembly receiving portion and a shape corresponding to the planned tearing portions, respectively;

(b) positioning the laminate sheet on the forming mold; And

(c) pressing the laminate sheet with a molding jig to form the electrode assembly receiving portion and the rupture planned portions.

Also, the step (ii) may include the following steps:

(a) preparing a forming mold in which a shape corresponding to the electrode assembly receiving portion is stamped;

(b) positioning the laminate sheet on the forming mold; And

(c) pressing the laminate sheet with a molding jig imprinted with a shape corresponding to the planned burst portions, thereby forming the electrode assembly receiving portion and the planned burst portions.

That is, the battery case may be formed with a rupture part using a molding die or a molding jig, each of which has a shape corresponding to the rupture planned parts. It is of course possible to form the planned rupture parts together by using the molding die and the molding jig in which the shape corresponding to the planned rupture parts is stamped.

In the case where the forming mold and the forming jig are used together to form the to-be-fractured portions, the in-forming positions where the to-be-fractured portions are formed may be formed at mutually corresponding positions or at positions not corresponding to each other.

The shape corresponding to the rupturable portion is angled with a positive angle so that grooves can be formed on the surface of the battery case. When the rupture planned portion is formed using the forming mold, grooves are formed on the outer surface of the battery case, When the jig is used to form the tearable portion, grooves are formed on the inner surface of the battery case.

As described above, the laminate sheet for forming the pouch-shaped battery case may include a resin layer and a metal layer.

Specifically, the laminate sheet may have a structure including an inner resin layer on which thermal fusion is performed, an intermediate metal layer ensuring mechanical rigidity, and an outer resin layer exhibiting durability and chemical resistance.

The battery case of the present invention places such a laminate sheet on a molding mold and presses a molding jig having a shape corresponding to the molding die to form a recessed electrode assembly housing part, do.

Specific examples of the molding die and the molding jig in which the shape corresponding to the planned rupture portion is stamped will be described later in detail with reference to the drawings.

Finally, in the step (iii), the electrode assembly is mounted on the housing of the battery case, the electrolyte solution is injected, and then the electrode assembly housing part is sealed.

This sealing process is performed by folding up the laminate sheet constituting the battery case or positioning the upper case and the lower case so that they can contact each other, and then thermally fusing the internal resin layer of the laminate sheet.

The present invention also provides a battery pack comprising at least one battery cell, and a device in which the battery pack is mounted.

Specific examples of the device include a power tool which is powered by an electric motor and moves; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and the like; An electric motorcycle including an electric bike (E-bike) and an electric scooter (E-scooter); An electric golf cart; And a power storage system, but the present invention is not limited thereto.

As described above, in the battery cell according to the present invention, when the electrode assembly is divided into two by the external impact, the divided parts of the divided electrode assemblies are pushed outwardly, And prevent the internal short circuit so as to prevent ignition or explosion, and to form the rupturing parts without any additional process, and it is possible to pass the impact test of the battery cell at a low cost and in a short time, The overall safety of the battery cell is improved.

1 is an exploded perspective view schematically showing a pouch type battery cell according to an embodiment of the present invention;
FIG. 2 is a perspective view of a pouch-shaped battery cell of FIG. 1 as viewed from a different point of view from FIG. 1;
FIGS. 3 to 8 are perspective views schematically illustrating a manufacturing process of a pouch-shaped battery case having a first tearable portion and a second tearable portion formed as part of the process of manufacturing the pouch-shaped battery cell of FIG. 1 ; And
Fig. 9 is a perspective view schematically showing modified examples of the molding die and the molding jig shown in Figs. 3 to 8. Fig.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

1 is an exploded perspective view schematically illustrating a pouch-shaped battery cell according to an embodiment of the present invention.

Referring to FIG. 1, a battery cell 100 includes a stack / folding type electrode assembly 300 embedded in a pouch-shaped battery case 200. Although FIG. 1 shows only the stack / folding type electrode assembly 300, a stacked, jelly-roll type electrode assembly may also be used.

Specifically, the battery cell 100 includes an electrode assembly 300 including an anode, a cathode, and a separator disposed therebetween in an interior of the pouch-shaped battery case 200, and electrode tabs 310 and 320 are welded to the positive terminal and the negative terminal and the positive and negative terminals are sealed so as to be exposed to the outside of the pouch type battery case 200 by attaching the insulating tapes 410 and 420.

The battery case 200 is made of a soft packaging material such as an aluminum laminate sheet and includes a case body 210 including a concave shaped housing part 230 on which the electrode assembly 300 can be placed, And a lid 220 to which one side is connected. The lid 220 may be separate or connected to the main body 210 according to a process.

The housing part 230 has a rectangular parallelepiped shape and has a pair of first faces 231 having the widest area and located on the opposite faces, a second pair of first faces 231 located adjacent to the long sides of the first faces 231, And a pair of third faces 233 adjacent to the short sides of the first faces 231 and located on opposite sides of the first faces 231.

The first rupture preventive unit 240 and the second rupture prevent unit 250 are formed on the third sides 233 of the storage unit 230 and the respective rupture planes 240 and 250 are positioned at mutually opposite positions Respectively. Specifically, the first tearable portion 240 is formed on the surface where the electrode terminals protrude, and the second tearable portion 250 is formed on the surface where the electrode terminals are not protruded.

On the other hand, the third tear-off portion may be formed on the first surfaces 231 and the second surfaces 232 at a central portion not adjacent to the third surfaces 233 (not shown).

The tear planes 240 and 250 have a shape in which a plurality of linear grooves are arranged in parallel in a plane, and the plurality of linear grooves are formed at an angle of 90 degrees with respect to an end of the electrode assembly.

Such a battery cell 100 has the effect of preventing the ignition or explosion from occurring due to the collision test or the like, thereby improving the safety. Hereinafter, the battery cell 100 will be described with reference to FIG.

FIG. 2 is a perspective view schematically illustrating a process of performing a collision test on the pouch-shaped battery cell of FIG. 1. Referring to FIG.

Referring to FIG. 2, when the battery cell 100 is viewed from above, when an impact is applied together with the round bar B, the electrode assembly is separated from the first separator 301 and the second separator 302, Lt; / RTI >

The first separator 301 is pushed out in the direction of the first tearable portion adjacent to the electrode terminal and the second separator 302 is pushed out in the direction of the second tearable portion opposite to the first tearable portion, The separators 301 and 302 do not contact each other.

Therefore, the internal short circuit does not occur, so it is not ignited in the process of performing the collision test.

The battery cell 100 having improved safety is achieved by forming the battery case 100 with the parts to be ruptured. Hereinafter, a method of manufacturing the battery case 100 of the battery cell 100 will be described with reference to FIGS.

FIGS. 3 to 8 are perspective views illustrating a manufacturing process of a pouch-shaped battery case having a first tearable portion and a second tearable portion formed as part of the process of manufacturing the pouch-shaped battery cell of FIG. 1; Respectively.

3 (a), FIG. 4 (b) shows the process of placing the laminate sheet on the mold, FIG. 5 shows the process (c) of pressing the laminate sheet with the molding jig, And FIGS. 6 to 8 show a process (d) of forming the storage portion and the planned rupture portion by removing the forming jig.

3, the molding die 400 is formed with a recessed portion 420 having a shape corresponding to the housing portion of the battery case on the mold main body 410, And protrusions 430 and 440 for forming a predetermined portion are formed.

The rupturing portion forming protrusions 430 and 440 form a first rupturing portion and a second rupturing portion, respectively, in a subsequent pressing process, and have a comb shape, but are not particularly limited. A modification example of the rupture example projection forming projections will be described later in more detail with reference to FIG.

Next, referring to FIG. 4 together with FIG. 3, the laminate sheet 600 is placed on the prepared mold 400.

Next, referring to FIG. 5 together with FIG. 4, the molding jig 500 is pressed on the laminate sheet 600 to form a storage portion of the battery case on the laminate sheet 600. At this time, the tearable portion is also formed by the tearable portion forming projections.

The forming jig 500 shown in Fig. 5 has a shape corresponding to the receiving portion and does not include protrusions for forming the tearable portion, but may include protrusions for forming a tearable portion. Will be described in more detail.

The molding jig 500 is placed in a direction corresponding to the indentation 420 of the molding die 400 and the process (c) is performed by applying pressure in the vertical direction.

6 through 8, the molding jig, which is superimposed on the indentation 420 of the molding die 400 and the laminate sheet 600 by the pressing process (c) And the molding die is removed from the laminate sheet 600. [

A laminate sheet 600 is formed which has rupturable parts 240 and 250 for improving the safety of the cell, And is used as the battery case 200. [

Fig. 9 is a perspective view schematically showing modified examples of the molding die and the molding jig shown in Figs. 3 to 8. Fig.

The forming mold 400a includes comb-like rupture-like projecting projections 430a and 440a in which linear grooves are formed at an angle of about 60 degrees with respect to the ends of the electrode assembly.

The forming mold 400b includes rupture protrusions 430b and 440b having linear grooves formed at an angle of about 45 degrees with respect to the ends of the electrode assembly and arranged in an intersecting relation with each other and having a net pattern.

The shaping jig 500a includes comb-like rupture-like projections 530a and 540a, which linear grooves are formed at an angle of about 60 degrees with respect to the end of the electrode assembly.

The forming mold 500b includes protrusions 530b and 540b which are formed at an angle of about 45 degrees with respect to the ends of the electrode assembly and are arranged in an intersecting relation with each other so as to form tearable portions having net patterns.

The protrusions for forming the predetermined portions of the forming molds 400a and 400b and the forming jigs 500a and 500b may be formed at positions corresponding to each other or may be formed at positions not corresponding to each other, The mold may be used with a molding die and a molding jig which are not provided with projections, but at least one of the molding die and the molding jig must include projections for forming a rupturable portion.

Thus, the battery cell according to the present invention can secure safety against collision tests and other external impacts by using the battery case according to the present invention.

Hereinafter, the present invention will be described in further detail with reference to the following examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

≪ Example 1 >

Manufacture of anode

A positive electrode mixture slurry was prepared by adding 96 wt% of LiCoO ₂ (cathode active material), 2.0 wt% of Super-P (conductive material) and 2.0 wt% of PVdF (binder) to NMP (N-methyl-2-pyrrolidone) , Followed by coating, drying and pressing on an aluminum foil to prepare a positive electrode.

Cathode manufacturing

A negative electrode mixture slurry was prepared by adding 96.3 wt% of artificial graphite (anode active material), 1.0 wt% of Super-P (conductive material) and 2.7 wt% of PVdF (binder) to a solvent NMP, And pressed to produce a negative electrode.

Manufacture of Secondary Battery

A stack / folding type electrode assembly was fabricated such that a polyolefin separator was interposed between the positive electrode and the negative electrode. The electrode assembly was embedded in a pouch-shaped battery case shown in FIG. 2, and a 1M LiPF ₆ carbonate- The battery was completed.

≪ Comparative Example 1 &

A secondary battery was manufactured in the same manner as in Example 1, except that the pouch-shaped battery case in which the tearable portions were not formed was used.

<Experimental Example 1>

Impact test

Twenty secondary batteries prepared in Example 1 and Comparative Example 1 were prepared in a fully charged state of 4.35V.

The battery was placed on a flat surface, and a bar having a diameter of 8 mm was placed on the battery at right angles to the center. Weighing 9 kg was dropped from the battery at a height of 60 cm to determine whether or not the battery was ignited. (See JIS C 8711).

Number of ignited samples Unknown Sample Maximum Temperature (℃) Example 1 none 85.5 Comparative Example 1 12 105.5

As shown in Table 1, the secondary batteries according to the present invention were not short-circuited and ignited, while the secondary batteries of Comparative Example 1 were short-circuited and ignited in a plurality of batteries.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (18)

A battery cell in which an electrode assembly composed of an anode, a cathode, and a separator is built in a pouch-shaped battery case,
A first rupture preventive part and a second rupture preventive part, in which the first separator is partly pushed out so that the separators of the nested electrode assembly can be pushed out while rupturing the battery case when an external impact is applied to the battery cell and the electrode assembly is bisected 2 separator is partially protruded from the battery case. The battery cell according to claim 1, wherein the pouch-shaped battery case comprises a laminate sheet including a resin layer and a metal layer. The battery cell according to claim 1, wherein the first tearable portion and the second tearable portion are formed at positions opposite to each other with respect to the center of the battery cell. The battery pack according to claim 1, wherein the battery case receiving portion on which the electrode assembly is mounted has a rectangular parallelepiped shape surrounded by rectangular faces;
A pair of first faces having relatively largest areas and located on opposite faces;
A pair of second faces adjacent to the long sides of the first faces and located on opposite sides of the first faces; And
A pair of third faces adjacent to the short sides of the first faces and located on opposite faces;
Wherein the battery cell is made of a metal. The battery cell according to claim 4, wherein the positive electrode terminal and the negative electrode terminal are located together or facing each other at a long side or a short side of the first surfaces. The battery cell according to claim 4, wherein the first tearable portion and the second tearable portion are respectively formed on the third surfaces. The battery cell according to claim 1, wherein each of the first tearable portion and the second tearable portion is formed in a comb-shaped structure having a plurality of linear grooves. [8] The battery cell of claim 7, wherein the comb-like structure has a shape in which linear grooves are arranged in a plane and parallel to each other. [8] The battery cell of claim 7, wherein the comb-like structure has a shape in which linear grooves are arranged in a plane. The battery cell according to claim 7, wherein the linear grooves are formed at a depth of 5% to 40% based on the thickness of the battery case. The battery cell of claim 7, wherein the linear grooves are formed at an angle of 30 to 90 degrees with respect to an end of the facing electrode assembly. The battery cell according to claim 6, wherein each of the first tearable portion and the second tearable portion is formed with an area of 50% to 100% based on the total area of the third surface. The battery cell according to claim 1, wherein the battery case further comprises a third predetermined planned breaking portion at a central portion of the battery cell. 14. A method of manufacturing a battery cell according to any one of claims 1 to 13,
(i) preparing an electrode assembly composed of an anode, a cathode, and a separator interposed between the anode and the cathode;
(ii) preparing a battery case having an electrode assembly receiving portion and a tearable portion having a shape corresponding to the electrode assembly; And
(iii) sealing the electrode assembly housing part after mounting the electrode assembly in the housing part and injecting the electrolyte solution;
&Lt; / RTI &gt; 15. The method of claim 14, wherein step (ii) comprises the following steps:
(a) preparing a forming mold having a shape corresponding to the electrode assembly receiving portion and a shape corresponding to the planned tearing portions, respectively;
(b) positioning the laminate sheet on the forming mold; And
(c) pressing the laminate sheet with a molding jig to form the electrode assembly receiving portion and the rupture planned portions. 15. The method of claim 14, wherein step (ii) comprises the following steps:
(a) preparing a forming mold in which a shape corresponding to the electrode assembly receiving portion is stamped;
(b) positioning the laminate sheet on the forming mold; And
(c) pressing the laminate sheet with a molding jig imprinted with a shape corresponding to the planned burst portions, thereby forming the electrode assembly receiving portion and the planned burst portions. A battery pack comprising at least one battery cell according to any one of claims 1 to 13. A device according to claim 17, wherein the battery pack is mounted.

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