KR20150134683A - Battery Cell Comprising Battery Case with Trimming Part Corresponding to Electorde Assembly of Stair-like Structure - Google Patents

Abstract

The present invention relates to a battery cell in which an electrode assembly having a structure of interposing a separation film between an anode and a cathode is provided in a battery case. The battery cell comprises: a battery case which includes an upper case and a lower case, and includes a housing portion for mounting an electrode assembly in the upper case and/or the lower case, and a sealing portion formed by sealing the upper case and the lower case; and an electrode assembly in which multiple electrodes or unit cells are stacked vertically with reference to a plane, and two or more electrodes or unit cells thereof have different planar sizes to form a stair structure, wherein a stair-structure step is formed to correspond to the outer face shape of the electrode assembly in the housing portion of the battery case, and trimming parts having a structure curved from the outside are formed in the sealing portion of the battery case to correspond to the shape of the housing portion having the stair-structure step.

Description

[0001] The present invention relates to a battery cell including a battery case having a trimming portion corresponding to a stepped electrode assembly,

The present invention relates to a battery cell including a battery case having a trimming portion corresponding to a stepped electrode assembly.

As technology development and demand for mobile devices have increased, the demand for secondary batteries as energy sources is rapidly increasing. In recent years, the use of secondary batteries as a power source for electric vehicles (EV) and hybrid electric vehicles (HEV) Among such secondary batteries, there is a high demand for lithium secondary batteries having high energy density, high discharge voltage and output stability.

The lithium secondary battery is classified into a cylindrical battery, a prismatic battery, a pouch-type battery, and the like depending on the outer shape thereof, and may be classified into a lithium ion battery, a lithium ion polymer battery, and a lithium polymer battery depending on the type of electrolyte.

Due to recent trend toward miniaturization of mobile devices, there is a growing demand for thin rectangular prismatic batteries and pouch-type cells, and particularly for pouch-type cells which are easy to deform in shape, low in manufacturing cost, Interest is high.

Generally, a pouch-type battery refers to a battery in which an electrode assembly and an electrolyte are sealed in a pouch-shaped case of a laminate sheet composed of a resin layer and a metal layer. The electrode assembly housed in the battery case may be of a jelly-roll type (wound type), a stacked type (stacked type), or a composite type (stacked / folded type).

The electrode assemblies are generally formed in a substantially rectangular shape. These electrode assemblies are embedded in a battery case to produce a rectangular parallelepiped pouch-shaped battery cell.

However, in recent years, there has been a demand for a new type of battery cell due to a slim type or various design trends. In the case of such a rectangular electrode assembly, there is a limit to the space utilization inside the device. An electrode assembly that can be applied to various shapes according to the shape of a device to which a secondary battery is applied is developed, and electrode assemblies having various external shapes are developed beyond the general rectangular shape.

1 shows a plan view (a) and a side view (b) of a battery cell including an electrode assembly forming a step structure as an example.

1, the pouch-type secondary battery 10 includes an electrode assembly 30 including an anode, a cathode, and a separator disposed between the anode and the cathode, And two electrode leads 40 and 41, which are electrically connected to each other, are sealed to be exposed to the outside.

The electrode assembly 30 has a plurality of electrodes or unit cells 31 and 32 of different sizes stacked in a height direction with respect to a plane to form a stepped structure.

The battery case 20 includes a lower case 21 including a concave shaped receptacle in which the electrode assembly 30 can be seated and an upper case 22 for sealing the electrode assembly 30 as a cover of such a lower case 21. [ ). In Fig. 1, the upper case 22 and the lower case 21 are shown as being connected integrally. However, a separate member may be used. At this time, the accommodating portion of the battery case 20 has a stepped step 24 corresponding to the outer shape of the electrode assembly 30.

However, as shown in the drawings, although the battery cell of the above-described structure has a stepped stepped portion corresponding to the outer shape of the electrode assembly in the battery case, the sealing portion extending from the accommodating portion has the same shape as that of the conventional rectangular electrode assembly The width of the sealing portion is determined corresponding to the height of the housing portion. In this case, when the width of the sealing portion is determined corresponding to the height of the housing portion, The sealing portion remains in an area with a low height and occupies an unnecessary space and becomes a factor that makes the subsequent process difficult. When the width of the sealing portion is determined corresponding to the low-height portion of the storage portion, There is a problem that adhesion is difficult.

Accordingly, there is a high need for a battery case and a battery cell including the same that can solve the above problems.

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.

The inventors of the present application have conducted intensive research and various experiments and have found that the sealing portions of the battery case are provided with trimming portions having a structure recessed from the outside so as to correspond to the shape of the accommodating portion having a stepped step, There is no problem of lowering the sealing property while improving the usability and processability of the space by having the appropriate width in the respective portions of the sealing portions and it is easy to manage the bonding area in the case of folding and tightly attaching the sealing portion to the housing portion It was confirmed that a good adhesion state can be maintained, and the present invention has been accomplished.

According to an aspect of the present invention, there is provided a battery cell comprising:

A battery cell in which an electrode assembly having a separator interposed between an anode and a cathode is embedded in a battery case,

A battery case comprising: an upper case and a lower case, wherein the upper case and / or the lower case include a storage part for mounting the electrode assembly, and a sealing part formed by sealing the upper case and the lower case; And

Wherein a plurality of electrodes or unit cells are stacked in a height direction with respect to a plane and at least two or more of the electrodes or unit cells have different planar sizes to form a stepped structure;

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The cell case sealing portion is formed with a stepped portion having a stepped structure corresponding to the outer shape of the electrode assembly. The battery case sealing portion is formed with a recessed structure Characterized in that trimming parts are formed.

In this case, trimming parts of a structure recessed from the outside are formed so as to correspond to the shape of the housing part having a stepped step in the battery case sealing part. In this case, the sealing part is bent upward, It means that the width of the sealing portion varies in accordance with the change of the height shape of the receiving portion. Specifically, the width of the sealing portion extending from the high-height portion of the storage portion is wider, and the width of the sealing portion extending from the low-height portion of the storage portion is smaller.

At this time, the height of the storage portion is based on the same direction as the stacking direction of the electrode assembly inside the battery case, and the width of the sealing portion is a direction perpendicular to the stacking direction, and the direction in which the battery case extends from the storage portion is used as a reference.

Accordingly, in one specific example, the trimming portions may be formed by being recessed by a difference in height of the receiving portion, and such a structure may be formed by cutting a predetermined length so as to be recessed by a height difference of the receiving portion.

That is, the sealing portion including the trimming portions as a whole may be a stepped structure having a step from the outside to the inside in a similar manner to the shape of the receiving portion.

At this time, the width of the sealing portion is not particularly limited as far as the trimming portions and the other portions have step differences, but the width of the sealing portion is not limited to the width of the sealing portion, for example, The sealing portion may be up-bent to have a size corresponding to the height of the receiving portion when the sealing portion is brought into close contact with the outer surface of the receiving portion for ease of area management and improvement in processability.

On the other hand, the unit cell may be a unit cell having the same type of electrodes placed on both sides or a unit cell having different types of electrodes located on both sides in a structure in which one or more positive electrodes and one or more negative electrodes are stacked with a separator interposed therebetween have. Specifically, the unit cells having the same type of electrodes located on both sides of the stacked structure may have a structure in which the anode is located on both sides, or a structure in which the cathode is disposed on both sides. For example, the structure of the anode / separator / cathode / separator / , Or a cathode / separator / anode / separator / cathode, and a structure in which the number of the anode and the cathode is larger is also possible. In a stacked structure, unit cells having different types of electrodes located on both sides may have a structure in which the positive electrode and the negative electrode are positioned on both sides, respectively, for example, a positive electrode / separator / negative electrode, Do.

The shape of the electrodes or the unit cells is not particularly limited and may be a parallelepiped shape, a planar polygonal shape, a circular shape, or the like. Further, it may be a flat plate or a plate having a curved surface. Accordingly, the sizes are different from each other, meaning that the electrode and the unit cell have different widths and / or lengths, and the width and the length are used as a reference for forming the electrode terminals.

In addition, the two or more electrodes or unit cells having different planar sizes may have the same thickness, different thickness, different thickness, and different thicknesses. Here, the thickness is based on the lamination direction.

Whether the difference in size of two or more electrodes or unit cells having different planar sizes is due to the width and / or the length affects the shape and position in which the trimming portions are formed.

In one example, two or more electrodes or unit cells having different planar sizes may have different widths of electrodes or unit cells based on the formation direction of the electrode terminals, wherein the trimming portions are formed on the upper Or may be formed in the upper sealing portion and the lower sealing portion which is an opposed surface thereof.

Since the electrode or unit cell is different in width but has the same length, the step structure is formed only in the width direction on the same plane, so that only the upper and lower sealing portions extending from the width of the electrode or unit cell form the trimming portions This is because it suffices. However, in the case where the upper case and the lower case are connected to each other, the battery case may not have a lower end sealing portion, and the trimming portions may be formed only in the upper end sealing portion.

In another example, two or more electrodes or unit cells having different planar sizes may have different lengths of electrodes or unit cells with respect to the forming direction of the electrode terminals, Side sealing portions, or both side sealing portions adjacent to the upper sealing portion, respectively.

This is because the width of the electrode or the unit cell is the same, so that the step structure is formed only in the longitudinal direction on the same plane, and thus the trimming portions are formed in the side sealing portions extending from the longitudinal direction of the electrode or the unit cell. However, in the case where the upper case and the lower case are connected to each other, the battery case may include side-side sealing portions on both sides, and side-side sealing portions may exist only on one side. Can be formed.

In another example, two or more electrodes or unit cells having different planar sizes may have different widths and lengths of electrodes or unit cells based on the direction in which the electrode terminals are formed, wherein the trimming portions have electrode terminals Or may be formed on either the top sealing portion and the two side sealing portions adjacent to the top sealing portion, or may be formed on one of the two side sealing portions adjacent to the top sealing portion, or formed on either the top sealing portion and the two side sealing portions adjacent thereto.

This is influenced by how the electrodes or unit cells are stacked in addition to the size difference type. Specifically, the electrodes or the unit cells may be stacked so that at least one of the front, rear, and both sides is on the same plane with respect to the electrode terminal formation direction, The trimming portions may be formed in the upper sealing portion where the electrode terminals are located, and the electrodes or the unit cells may be formed in the forming direction of the electrode terminals The trimming portions may be formed on the one side sealing portion located on the one side surface, and the electrodes or the unit cells may be formed on the one side surface sealing portion located on one side surface, The trimming portions are formed so that the front surface and the one side surface are laminated on the same plane, May be formed on the upper sealing part and the one side sealing part located on the one side.

However, the present invention is not limited to the above-described structure, and other various laminated structures are also possible, so that the position of the sealing portion in which the trimming portions are formed can be determined. That is, if at least one of the front, rear, and both sides has a stepped structure on the same plane, the sealing portions of the corresponding portions may be formed with trimming portions.

Here, the front, rear, and both side surfaces are determined based on the direction in which the electrode terminals are formed, and the front surface or the rear surface refers to a surface where the electrode terminals protrude, the surface facing the front surface is the rear surface, Refers to a plane perpendicular to the plane and a surface of the electrode terminal non-formation portion.

The battery cell having such a structure can provide a battery cell that can effectively utilize the dead space inside the device in accordance with devices of various designs unlike the conventional electrode assembly. In addition, in order to make the battery cell compact and secure, The sealing portion of the battery case can be partially adhered to the housing portion appropriately without remaining or lacking enough to partially adhere to the housing portion of the case so that the adhesion area of the sealing portion can be easily controlled and a good adhesion state to the housing portion can be maintained, There is an effect of improving space usability and fairness without a problem of lowering the sealability.

The battery case may be formed of a laminate sheet including a resin layer and a metal layer. As described above, the two side sealing parts adjacent to the upper sealing part where the electrode terminals of the sealing parts are located, The electrical insulating material may be attached to the ends of the both side sealing portions along the end portion of the side sealing portions.

The addition of such an electrically insulating material solves the problem of the dielectric breakdown phenomenon caused by the exposure of the metal layer of the battery case and improves the sealing performance of the battery while insulating the outer periphery of the fused portion using a PET label and tape It is possible to solve the problem that peeling phenomenon of the label and the tape appearing in the case of bending, bubble or wrinkle occurs.

Of course, the upper end sealing portion where the electrode terminal is located can also be bent upward. In this case, the electrode terminal is bent downward again to manufacture the battery cell, so that a more compact battery cell can be manufactured.

The battery cell according to the present invention may be a lithium secondary battery in detail.

The lithium secondary battery is manufactured by housing the electrode assembly in a battery case, and impregnating the electrode assembly with a non-aqueous electrolyte solution containing a lithium salt.

The present invention also provides a battery pack comprising the battery cell as a unit cell and a device including the battery pack as a power source.

The device may be any one selected from a smart phone, a mobile phone, a notebook, a tablet PC, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a system for power storage.

As described above, the battery cell according to the present invention includes the electrode assembly having a stepped structure, a housing portion having a stepped stepped portion corresponding to the outer shape of the electrode assembly, The present invention provides a battery cell that can effectively utilize a dead space in a device in accordance with devices of various designs unlike a conventional electrode assembly, by providing a battery cell including a sealing portion having trimming portions formed therein, When the sealing part is bent and tightly attached to the housing part of the battery case for compactness and safety of the battery cell, the sealing part of the battery case can be partially adhered to the housing part properly without remaining or lacking. It is easy to maintain a good adhesion state to the storage portion, and the sealing property is deteriorated There is an effect that space usability and fairness can be improved while there is no problem.

1 is a plan view and a side view of a battery cell including a conventional stepped electrode assembly;
2 is a plan view of a battery cell according to one embodiment of the present invention;
FIG. 3 is a perspective view of a battery cell in which both side sealing portions of the battery case of FIG. 2 are bent; FIG.
4 to 7 are plan views of battery cells according to another embodiment of the present invention.

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.

FIG. 2 is a plan view of a battery 100 according to an embodiment of the present invention, and FIG. 3 is a perspective view of a battery cell in which both side sealing portions of the battery case of FIG. 2 are bent.

Referring to these figures, in the battery cell 100 according to the present invention, two electrodes or unit cells 111 and 112 having different lengths with reference to the forming direction of the electrode terminals 140 are arranged in a plane The electrode assembly 110 which is stacked in the height direction and forms a stepped structure is mounted on the housing part 130 of the battery case 120 and is sealed by the battery case 120, And two electrode terminals 141 and 142, which are electrically connected to the positive and negative electrodes tabs 111 and 112, are sealed so as to be exposed to the outside.

The housing part 130 of the battery case 120 is formed with a stepped stepped structure corresponding to the outer shape of the electrode assembly 110 of the stepped structure, Sealing portions 121, 122, and 123 are formed in a state in which the upper case and the lower case are sealed while extending from the receiving portion 130. [ At this time, a receiving part 130 having a stepped step is formed in both side sealing parts 122 and 123 adjacent to the upper sealing part 121 where the electrode terminal 140 of the sealing parts 121, 122 and 123 is formed, The trimming parts 124 and 125 are formed from the outside so as to correspond to the shape of the trimming parts 124 and 125, respectively. This is because the step structure is formed only in the longitudinal direction on the same plane.

The trimming portions 124 and 125 are formed by being cut out by a predetermined length with a structure recessed from the outside by the height difference of the receiving portion 130. Therefore, both side sealing portions 122 and 123 have a stepped structure similar in overall shape to that of the battery case 120, and when they are brought into close contact with the accommodating portion 130 as shown in FIG. 3, And corresponds to the height of the accommodating portion 130. That is, the width of both side sealing portions 122 and 123 is wide in a portion where the height of the storage portion 130 is high, and is small in a portion where the height of the storage portion 130 is low.

Although not shown in the drawings, the problem of the insulation breakdown phenomenon caused by exposing the metal layer of the battery case to the ends of the upwardly bent both side sealing portions 122 and 123 is solved, and the electrical insulation material Can be added.

4 to 7 illustrate a plan view of the battery cells 200, 300, 400, and 500 according to another embodiment of the present invention in order to more specifically describe the battery cells having various structures according to the present invention. Are shown.

Referring to FIG. 4, unlike FIG. 2, the battery cell 200 includes two electrodes or unit cells 211 and 212 having different widths with reference to a forming direction of the electrode terminals 240 The electrode assembly 210 which is stacked in the height direction with respect to the plane and forms a step structure is mounted on the housing portion 230 of the battery case 220 and is sealed by the battery case 220, The two electrode terminals 241 and 242 which are electrically connected to the positive and negative electrode taps of the unit cells 211 and 212 are in a state in which both electrodes or the unit cells 211 and 212 are biased And is sealed to be exposed to the outside.

The housing part 230 of the battery case 220 has a stepped structure stepped to correspond to the outer shape of the stepped electrode assembly 210, And sealing portions 221, 222, and 223 extending from the receiving portion 230 and having the upper case and the lower case sealed are formed. The upper sealing portion 121 having the electrode terminals 240 of the sealing portions 221, 222 and 223 is formed in a shape of a recessed portion A trimming portion 224 is formed. This is because the step structure is formed only in the width direction on the same plane.

Of course, only the structure in which the upper case and the lower case are integrally connected as shown in FIG. 4 is shown without a bottom sealing part, so that if a bottom sealing part is provided, a trimming part is also formed in the bottom sealing part Do.

The shape and manufacturing method of the trimming sections 124 and 125 are similar to those described with reference to FIG. 2, and a description thereof will be omitted.

5 to 7, unlike FIGS. 2 and 4, three electrodes or unit cells having different widths and lengths are stacked in a height direction with respect to a plane, forming a step structure The battery cells 300, 400, and 500 including the electrode assembly in which the electrodes or the unit cells are stacked are different from each other.

5, the battery cells 300 are formed such that the electrodes or the unit cells 311, 312, and 313 have the same front face only in the direction in which the electrode terminals 340 (341 and 342) are formed The electrode assembly 310 stacked so as to be on a plane is mounted on the housing part 330 of the battery case 320 and is sealed by the battery case 320. [

The housing part 330 of the battery case 320 has a stepped structure stepped to correspond to the outer shape of the electrode assembly 310 of the stepped structure, And sealing portions 321, 322 and 323 extending from the receiving portion 230 and having the upper case and the lower case sealed.

At this time, since the electrodes or the unit cells 311, 312, and 313 exist on the same plane only on the front surface, the step structure on the plane is formed on both sides only at the front surface, The trimming portions 324 and 325 having a structure recessed from the outside so as to correspond to the shape of the housing portion 330 having the stepped structure step are formed on only the upper sealing portion 321 in which the electrode terminal 340 is formed, And is formed in a stepped shape having a stepped portion.

6, the battery cells 400 may be formed such that the electrodes or unit cells 411, 412, and 413 are formed on the same side only on the basis of the formation direction of the electrode terminals 440 (441 and 442) The electrode assembly 410 stacked to be on a plane is mounted on the housing part 430 of the battery case 420 and is sealed by the battery case 420. [

The housing part 430 of the battery case 440 is formed with a step of a stepped structure corresponding to the outer shape of the stepped electrode assembly 410, And sealing portions 421, 422, and 423 are formed in a state in which the upper case and the lower case are sealed, except for the rear surface, based on the formed portion, from the receiving portion 430.

At this time, since the electrodes or the unit cells 411, 412, 413 are on the same plane only on one side, the stepped structure on the plane is formed on the one side only on the upper and lower sides, Only one side sealing portion 422 adjacent to the upper sealing portion 421 in which the electrode terminals 440 are formed is formed so as to correspond to the shape of the receiving portion 430 having the stepped stepped structure The trimming portions 324 and 325 of the structure are formed in a stepped shape having three steps above and below the one side sealing portion 422. [

Referring to FIG. 7, the battery cell 500 has a structure in which electrodes or unit cells 511, 512, and 513 are formed on the same plane as the front and one sides of the electrode terminals 540, 541, The electrode assembly 510 stacked so as to be present in the battery case 520 is mounted on the housing part 530 of the battery case 520 and is sealed by the battery case 520. [

The housing part 530 of the battery case 540 has a stepped structure stepped to correspond to the outer shape of the stepped electrode assembly 510, And sealing portions 521, 522, and 523 are formed in a state in which the upper case and the lower case are sealed, except for the rear surface, based on the forming portion, from the receiving portion 530.

At this time, since the electrodes or unit cells 511, 512, 513 are on the same plane on the front surface and one side surface, the stepped structure on the plane is formed on both the front surface and the one side surface, 522 and 523 are formed on both the upper sealing portion 521 and the one side sealing portion 522 adjacent to the electrode terminal 540 on the outer side so as to correspond to the shape of the accommodating portion 530 And the trimming portions 524 and 525 of the structure indented from the stepped portion are formed in a stepped shape having three steps.

As described above, according to the present invention, at least one of the sealing portions on four sides of the battery case is formed in a shape that is recessed from the outside so as to correspond to the shape of the receiving portion, depending on the size difference between the electrodes or the unit cells, There is no problem of lowering the sealability while improving the usability and fairness of the space, and there is no problem of bending of the sealing portion into the housing portion, It is easy to manage and maintain a good adhesion state.

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 (22)

A battery cell in which an electrode assembly having a separator interposed between an anode and a cathode is embedded in a battery case,
A battery case comprising: an upper case and a lower case, wherein the upper case and / or the lower case include a storage part for mounting the electrode assembly, and a sealing part formed by sealing the upper case and the lower case; And
Wherein a plurality of electrodes or unit cells are stacked in a height direction with respect to a plane and at least two or more of the electrodes or unit cells have different planar sizes to form a stepped structure;
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The cell case sealing portion is formed with a stepped portion having a stepped structure corresponding to the outer shape of the electrode assembly. The battery case sealing portion is formed with a recessed structure Characterized in that trimming parts are formed. The battery cell according to claim 1, wherein at least two electrodes or unit cells having different planar sizes have different widths and / or lengths of electrodes or unit cells based on the direction in which electrode terminals are formed. The battery cell according to claim 2, wherein two or more electrodes or unit cells having different planar sizes have different thicknesses of electrodes or unit cells. The unit cell according to claim 1, wherein the unit cell has a structure in which one or more positive electrodes and one or more negative electrodes are stacked with a separator interposed therebetween, And the other unit cell. The battery cell according to claim 1, wherein the trimming portions are recessed by a height difference of the accommodating portion. The battery cell according to claim 1, wherein the trimming portions are cut by a predetermined length so as to be inserted into the accommodating portion by a height difference. The battery cell according to claim 1, wherein the sealing portion including the trimming portions is a stepped structure in which the overall shape has a step from the outside toward the inside. The battery cell according to claim 1, wherein a width of the sealing portion is a size corresponding to a height of the accommodating portion when the sealing portion is bent upwards and brought into close contact with an outer surface of the accommodating portion. [2] The apparatus of claim 1, wherein the two or more electrodes or unit cells having different planar sizes have different widths of electrodes or unit cells with respect to a direction in which the electrode terminals are formed, Or formed on the upper sealing portion and the lower sealing portion which is an opposed surface of the upper sealing portion. [2] The apparatus of claim 1, wherein the two or more electrodes or unit cells having different planar sizes have different lengths of electrodes or unit cells with respect to the direction in which the electrode terminals are formed, Wherein the first and second side sealing portions are formed on both side sealing portions or one side sealing portion adjacent to each other. [2] The apparatus of claim 1, wherein the two or more electrodes or unit cells having different planar sizes have different widths and lengths of electrodes or unit cells with respect to a forming direction of the electrode terminals, Or both of the side sealing portions adjacent to the upper sealing portion, or formed on any one of the upper sealing portion and the two side sealing portions adjacent thereto. 12. The battery cell according to claim 11, wherein the electrodes or the unit cells are stacked such that at least one of the front, back, and both sides is on the same plane with respect to a forming direction of the electrode terminal. 12. The plasma display panel of claim 11, wherein the electrodes or the unit cells are stacked such that the front surfaces thereof are on the same plane with respect to the direction in which the electrode terminals are formed, and the trimming portions are formed in the upper sealing portion A battery cell characterized by: 12. The plasma display panel of claim 11, wherein the electrodes or unit cells are stacked such that one side is on the same plane with respect to a direction in which the electrode terminals are formed, and the trimming portions are formed in a side sealing portion Wherein the battery cell comprises a battery cell. 12. The plasma display panel of claim 11, wherein the electrodes or the unit cells are laminated such that the front surface and the one side surface are on the same plane with respect to the electrode terminal formation direction, and the trimming portions include an upper sealing portion, Wherein the one side sealing portion is formed on one side surface sealing portion located on one side surface of the battery cell. The battery cell according to claim 1, wherein the battery case comprises a laminate sheet including a resin layer and a metal layer. The battery cell according to claim 1, wherein both side sealing portions adjacent to the upper sealing portion where the electrode terminals of the sealing portions are located are bent upward along the shape of the receiving portion of the battery case. 18. The battery cell according to claim 17, wherein an electrically insulating material is attached to the ends of the both side sealing portions along the ends of both side sealing portions. The battery cell according to claim 1, wherein the battery cell is a lithium secondary battery. A battery pack comprising a battery cell according to any one of claims 1 to 19 as a unit cell. A device comprising the battery pack according to claim 20 as a power source. 22. The device of claim 21, wherein the device is selected from a smart phone, a mobile phone, a laptop, a tablet PC, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug- .

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