KR20130035754A - Second battery with porous structures and battery module using the same - Google Patents

Abstract

PURPOSE: A secondary battery is provided to prevent the internal short by minimizing the movement of an electrode assembly, and to remarkably improve electrolyte impregnation. CONSTITUTION: A secondary battery includes one or more through-holes(40). The through-holes are formed on one or more of an electrode assembly which includes a positive electrode, a negative electrode, a separator, and a pouch exterior which includes the electrode assembly. The through-holes are formed in the location where the through-holes in the electrode assembly and the pouch exterior correspond to each other. Whole surface of one or more through-holes are 2-20% of the cross-sectional area of the pouch type secondary battery. The electrode assembly is one or more selected from a jelly-roll type, a stack type, a stack/folding type, and a Z-stack/folding type.

Description

Secondary battery with porous structure and battery module including same {Second battery with porous structures and battery Module using the same}

The present invention relates to a secondary battery having a porous structure and a battery module including 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.

Representatively, there is a high demand for rectangular secondary batteries and pouch secondary batteries, which can be applied to products such as mobile phones with a thin thickness in terms of shape of batteries, and lithium ion batteries with high energy density, discharge voltage, and output stability in terms of materials. There is a high demand for lithium secondary batteries such as lithium ion polymer batteries.

 FIG. 1 schematically shows a general structure of a typical conventional pouch-type secondary battery as an exploded perspective view.

Referring to FIG. 1, the pouch type secondary battery 100 may include an electrode assembly 300, electrode tabs 310 and 320 extending from the electrode assembly 300, and electrodes welded to the electrode tabs 310 and 320. And a battery case 200 accommodating the leads 410 and 420 and the electrode assembly 300.

The electrode assembly 300 is a power generator in which a positive electrode and a negative electrode are sequentially stacked in a state where a separator is interposed therebetween, and has a stack type or a stack / fold type structure. The electrode tabs 310, 320 extend from each pole plate of the electrode assembly 300, and the electrode leads 410, 420 are welded with a plurality of electrode tabs 310, 320 extending from each pole plate, for example, welding. Each is electrically connected to each other, and part of the battery case 200 is exposed to the outside. In addition, an insulating film 430 is attached to a portion of the upper and lower surfaces of the electrode leads 410 and 420 to increase the sealing degree with the battery case 200 and to secure an electrical insulation state.

The case 200 is made of an aluminum laminate sheet, provides a space for accommodating the electrode assembly 300, and has a pouch shape as a whole. In the stacked electrode assembly 300 as shown in FIG. 1, a plurality of positive electrode tabs 310 and a plurality of negative electrode tabs 320 may be coupled together to the electrode leads 410 and 420. The upper end is spaced apart from the electrode assembly 300 at predetermined intervals.

In addition, since the electrode assembly 300 and the battery case 200 are fixed to each other only by sealing the sealing portions of the battery case together with the electrode leads 410 and 420, the electrode assembly 300 is weak due to a weak fixing force. 200 there is a problem to flow inside.

On the other hand, Figure 2 is a partial enlarged view of the upper inside of the battery case is coupled to the positive electrode lead is coupled in a compact form in the secondary battery of FIG.

Referring to FIG. 2, a plurality of positive electrode tabs 310 extending from the positive electrode current collector 301 of the electrode assembly 300 protrude from the positive electrode collector 300, for example, in the form of a welded portion integrally bonded by welding. 410 is connected. The positive lead 410 is sealed by the battery case 200 while the opposite end 412 to which the positive electrode tab welding part is connected is exposed.

Since the plurality of positive electrode tabs 310 are integrally coupled to form a welded portion, the inner upper end of the battery case 200 is spaced apart from the upper surface of the electrode assembly 300 by a predetermined distance, and the positive electrode tabs 310 of the welded portion are formed. Is bent in a substantially V shape.

Therefore, the coupling region between the electrode tabs and the electrode lead is also referred to as a V-forming region. In such a pouch type secondary battery, the electrode assembly is easily moved along the interface with the battery case due to the empty space of the V-forming part during the vibration or drop of the battery.

In particular, the lithium salt-containing electrolyte injected into the battery case acts as a kind of lubricating oil at the interface between the electrode assembly and the battery case, further promoting the movement of the electrode assembly. The movement of the electrode assembly causes an internal short circuit caused by the contact of different electrodes at the V-forming part, and ultimately degrades the safety of the battery. Thus, a method for securing safety in manufacturing a pouch-type battery is required. need.

In this regard, Japanese Patent Application Laid-Open No. 2005-183820 discloses an electrode assembly consisting of an anode / separation membrane / cathode, which is incorporated in an upper and lower battery cases coupled in an insulated state, wherein Between the electrode forming the outer surface and the inner surface of the upper and lower cases, respectively, by forming an adhesive layer made of a conductive adhesive and an organic solvent contained in the electrolyte, and heat-treatment, the electrode assembly is stably fixed inside the battery case and the electrode assembly It provides a secondary battery consisting of electrically connecting the electrode and the upper and lower cases.

However, in the above technique, since the adhesive layer is made of a paste, applied, and exhibits adhesiveness by heat treatment, the overall manufacturing process of the battery is complicated, and deterioration of other members such as an electrode active material and an electrolyte during the heat treatment of the adhesive layer is prevented. There are disadvantages that result.

Therefore, there is a high need for a technology that can fundamentally solve the overall safety by preventing the flow of the electrode assembly inside the battery enclosure.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art and the technical problems required from the past.

An object of the present invention is to provide a secondary battery that can stably fix the battery case and the electrode assembly to prevent movement of the electrode assembly to prevent internal short circuit, and ultimately to ensure excellent safety.

It is another object of the present invention to provide a secondary battery including an electrode assembly having improved impregnation with electrolyte.

Still another object of the present invention is to provide a secondary battery module or a battery pack that includes a plurality of secondary batteries to stably fix and thereby improve safety.

The present invention provides a pouch type secondary battery including one or more through holes in order to solve the above problems.

Preferably, the through holes may be formed in at least one or more of an electrode assembly including an anode, a cathode, a separator, and a pouch sheath including the same.

In addition, the through holes may be formed at the same position so that the through hole of the electrode assembly and the through hole of the pouch case may correspond to each other.

Further, the through hole of the electrode assembly and the through hole of the pouch-type packaging material may be formed in the same shape.

In addition, the size of the through hole of the electrode assembly may be larger than the size of the through hole of the corresponding pouch case.

In addition, the electrode assembly through hole may be larger than the through hole of the pouch case by the width of the additional sealing portion formed along the inner circumferential surface thereof.

In addition, the one or more through-holes may be formed spaced apart at the same interval,

The one or more through holes are formed in the center of the battery along the long side of the pouch type secondary battery,

The at least one through hole may be formed at the center of the battery along a short side of the pouch type secondary battery.

On the other hand, characterized in that the additional sealing portion is formed along the inner peripheral surface of the through-hole of the electrode assembly.

In this case, the through hole may be formed in any one shape selected from the group consisting of a curvature angular, square, triangular, rounded, elliptical, vertices,

Preferably, the through hole may be formed in a circular shape.

Meanwhile, the total area of the one or more through holes may be 2% to 20% of the planar area of the pouch type secondary battery.

In addition, the electrode assembly may be any one selected from a jelly-roll type, a stack type, a stack / fold type, and a Z-stack / fold type.

The present invention further provides a battery module including the pouch type secondary battery as a unit cell.

In this case, the battery module may be connected to the cooling line through at least one through-hole formed in the unit cell,

In addition, the battery module may be a unit cell fixed rod is connected through at least one through-hole formed in the unit cell.

The battery module includes a power tool; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV); Electric two-wheeled vehicles including E-bikes and E-scooters; Electric golf carts; Electric trucks; It may be used as any one or more power sources selected from the group consisting of medium and large devices of the electric commercial vehicle.

As described above, the secondary battery according to the present invention can be stably added to the electrode assembly and the fusion part of the battery case to stably fix the movement of the electrode assembly, thereby preventing internal short circuiting and increasing safety, and increasing porosity. Due to the structure of the electrode assembly of the structure there is an effect that can greatly increase the impregnation of the electrolyte.

Furthermore, the present invention can further improve the safety, performance, and lifespan of a secondary battery module or a battery pack including one or more secondary batteries by arranging, fixing or cooling a plurality of secondary batteries using the through holes of the secondary batteries. Provides a secondary battery module or a battery pack.

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.

1 is an exploded perspective view of a general structure of a conventional pouch type secondary battery.
FIG. 2 is a partially enlarged view of an upper portion of an inside of a battery case in which the positive electrode tabs are densely coupled in the secondary battery of FIG. 1 and connected to the positive electrode lead.
3 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.
4 is a perspective view of a state in which the secondary battery according to FIG. 3 is sealed.
5 is an exploded perspective view of a secondary battery module including a plurality of secondary batteries according to FIG. 3.
6 is an exploded perspective view of an embodiment in which a cooling line is connected through a secondary battery through hole in the secondary battery module.

The present invention provides a pouch-type secondary battery including at least one through hole in order to solve the prior art as described above.

In this case, the through holes are formed in the electrode assembly including the anode, the cathode, the separator, and the pouch sheath including the same, and are formed at the same position so that the through holes of the electrode assembly and the through holes of the pouch sheath can correspond to each other. A secondary battery including the above through hole is formed.

The secondary battery according to the present invention can more firmly fix the pouch-type exterior material and the electrode assembly through the through hole, to prevent the electrode assembly from flowing inside the pouch-type exterior material, and to apply external force such as a drop and an external impact. To improve the safety of the city.

In particular, when used as a power source for a medium-large device such as a battery car with a lot of external shock or shake, it is possible to prevent the risk of internal short circuit and heat generation, fire, and the like caused by the flow of the electrode assembly, and greatly increase safety.

The shape of the through hole formed in the secondary battery is not particularly limited, and may be formed in various shapes such as a curvature diagram, a rectangle, a triangle, and the like processed to have a curvature of a circle, an oval, and other vertices. However, in order to prevent the electrode or the separator included in the electrode assembly from being torn or damaged, it is preferable to form the through hole in a shape without corners or angles. Therefore, the through hole is preferably formed in a circular shape.

The through holes of the electrode assembly and the through holes of the pouch type exterior member may have different shapes, and may have the same shape, but may be formed in a circular shape with the same shape.

In addition, the size of the through hole of the electrode assembly and the through hole formed in the pouch sheath is not particularly limited, but the size of the through hole of the electrode assembly is preferably larger than the size of the through hole of the corresponding pouch sheath material.

This is to allow an additional sealing portion formed by the pouch-type exterior material along the inner circumferential surface of the electrode assembly through-hole, so that the size of the through-hole of the electrode assembly is larger than the size of the through-hole formed in the corresponding pouch exterior material. As long as the area that the additional sealing portion can be formed, such as can be satisfied.

In addition, the size and number of the through holes according to the present invention are not particularly limited and may be variously designed according to the use and shape of the battery.

However, when the size of the through hole is too large or forms too many through holes, the through holes may be disadvantageous in terms of capacity of the battery. Therefore, the through holes are formed in a minimum size and number to fix the electrode assembly and the pouch sheathing material. desirable.

More preferably, all the areas occupied by the through holes may be configured to occupy (2)% to (20)% based on the plane of the electrode assembly. If the ratio of the through-holes outside the above range becomes higher, there may be a problem that the capacity of the battery is lowered. If the ratio is not reached, it is difficult to effectively fix the electrode assembly with the battery outer case.

In an embodiment of the present invention, a plurality of through holes of a small size may be evenly distributed on the plane of the secondary battery within the range of the area ratio as described above, and in this case, the plurality of through holes are formed to be spaced at equal intervals. This is preferred.

In one preferred embodiment, the plurality of through-holes are arranged in a line at the center of the battery along the long side of the pouch type secondary battery or in a line at the center of the battery along the short side of the secondary battery. It may be.

At this time, the through-holes formed at both ends are formed to be spaced apart from the end by the same interval, preferably formed two through-holes at positions symmetrical with respect to the center spaced from the same distance from both ends of the minimum through-hole Formation may allow the electrode assembly and the battery envelope to be fixed.

At this time, the area of one through-hole is preferably formed to be 1% to 10% based on the planar area of the entire secondary battery. However, for convenience of the process, when forming only two through-holes at both ends symmetrically in the longitudinal direction with respect to the center of gravity of the secondary battery, that is, the center of the electrode assembly, sealing with the battery outer case The through hole may be formed at a position spaced apart from both ends by an L / 6 length with respect to the length L of the long side of the secondary battery. have.

Meanwhile, the through hole may be formed by assembling an electrode assembly including a plurality of electrodes and a separator and then storing the through hole in a battery enclosure and forming the through hole and further sealing, and in a predetermined shape and position. In the same manner, the electrode assembly having the through hole and the separator may be manufactured using the electrode assembly having the through hole formed therein and the battery outer case having the through hole formed at a corresponding position.

As described above, the electrode assembly of the present invention may not only fix the electrode assembly by including one or more through holes therein, but also significantly increase the impregnation of the electrolyte.

In general, the impregnation of the electrolyte is difficult to penetrate the electrolyte solution into the interior of the electrode assembly, the impregnation is poor, but the electrode assembly of the present invention includes one or more through holes therein, the electrolyte also penetrates through the electrode assembly inside here Is possible, there is an effect that the electrolyte impregnation of the electrode assembly can be significantly increased.

However, in the case where the through-hole is formed in advance, it is preferable to inject the electrolyte and activate the battery after all the sealing processes for the through-hole are finished. Otherwise there is a risk of leakage of the electrolyte.

On the other hand, the shape of the electrode assembly according to the present invention is not particularly limited, a jelly roll-type electrode assembly of the structure wound around a long sheet-shaped anode and cathode and a separator therebetween; A stack & folding electrode that includes a cathode, an anode, and a separator, wherein a plurality of unit cells each having the same or different electrodes at both ends are disposed on a long film separator, and then wound in a single direction. Assembly; A Z-stack & folding electrode assembly wound around the long film type separator in a zigzag direction; The electrode assembly, such as a stacked electrode assembly having a structure in which a plurality of unit cells are stacked, may be any one.

In addition, the secondary battery according to the present invention heat-sealed or heat-sealed the sealing portion of the peripheral edge of the battery packaging material and the portion of the battery cell is located by the heat sealing jig after storing the electrode assembly in the battery packaging material The through part can be formed by forming the through hole by a method such as punching.

The formation of such a through part may be manufactured using a thermal fusion jig configured to be thermally compressed to the same part as the shape and location of the through hole, but is not limited thereto.

In this case, the size of the through hole may be smaller than the size of the through hole formed on the electrode assembly. This is because the sealing margin that can be sealed in the battery packaging material inside the through hole. On the other hand, the sealing portion of the battery packaging material formed along the inner circumferential surface of the through-hole on the secondary battery, it is preferably arranged in the battery module, folding the sealing margin in either direction to facilitate the installation of the fixed rod or cooling line.

Meanwhile, the secondary battery according to the present invention may be a secondary battery in which the positive electrode lead and the negative electrode lead protrude in the same direction, or may be a secondary battery in which the positive electrode lead and the negative electrode lead protrude in opposite directions.

In addition, the battery envelope may be formed in only one of the top or bottom of the electrode assembly receiving space in which the space is formed to accommodate the electrode assembly, or may be formed in the upper and lower storage space of the electrode assembly.

On the other hand, the pouch exterior material may use a known exterior material, for example, the exterior material is a pouch-type exterior material in the form of a laminate sheet including a metal layer and a resin layer. In particular, the pouch type exterior material of an aluminum laminate sheet is preferable. The laminate sheet is composed of an outer coating layer of a polymer film, a barrier layer of a metal foil, and an inner sealant layer of a polyolefin series, and the outer coating layer must have excellent resistance from an external environment, and thus, it is necessary to have a predetermined tensile strength and weather resistance. . In such aspect, a stretched nylon film or polyethylene terephthalate (PET) may be preferably used as the polymer resin of the outer resin layer. The barrier layer is preferably aluminum may be used to exhibit a function of improving the strength of the battery case in addition to the function of preventing the inflow or outflow of foreign substances such as gas, moisture. The inner sealant layer has a heat sealability (heat adhesiveness) and a low hygroscopicity to suppress the invasion of the electrolyte solution, polyolefin resin that is not expanded or eroded by the electrolyte may be preferably used, more preferably unstretched Polypropylene (cPP) can be used.

Furthermore, the outer coating layer and the inner sealant layer may be formed in two or more layers. For example, the outer coating layer may be a PET / ONy layer, and the inner sealant layer may be formed of a double structure such as PPa (Acid modified PP / cPP). It may be, but is not limited to such.

In addition, the electrode lead may be formed of, for example, one or more metals selected from the group consisting of aluminum, stainless steel, copper, nickel, titanium, tantalum, and niobium, but is not limited thereto.

When the electrode lead is a negative electrode, for example, one or more metals selected from the group consisting of copper, nickel, stainless steel, and alloys thereof are preferred, but not limited thereto. The joining method can also use well-known methods, such as a laser and ultrasonic welding, and is not specifically limited.

The secondary battery according to the present invention may not only be used in a battery cell used as a power source for a small device but also as a unit battery in a medium or large battery module or battery pack including a plurality of battery cells that may be used as a power source for a medium and large device. It can be used preferably.

As described above, a battery module or a battery pack including a plurality of secondary batteries according to the present invention is provided by the fixing rod through the through-hole formed in the secondary battery that the plurality of secondary batteries are separated or flow by external shaking or impact, etc. It can be prevented, or by installing a cooling line through the through-hole to prevent overheating due to the use of the battery and further has the effect of preventing heat, fire, etc. in the event of an emergency.

At this time, the medium and large devices include a power tool; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Electric two-wheeled vehicles including E-bikes and E-scooters; Electric Golf Carts; Electric trucks; Electric commercial vehicle; Power storage systems and the like, but are not limited thereto.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited by the scope of the present invention for easier understanding of the present invention.

3 is an exploded perspective view schematically showing a secondary battery according to one embodiment of the present invention.

Since the pouch-type battery of FIG. 3 except for the features of the present invention is substantially the same as a conventional pouch-type battery which is generally used, descriptions of the other matters except for the features of the present invention may be omitted. .

Referring to FIG. 3, the pouch type secondary battery of the present invention includes an electrode assembly 10 having a plurality of through holes 40 and a battery exterior member 50.

The through holes 40 may be formed at two symmetrical positions at both ends of the electrode assembly with respect to the long length direction of the electrode assembly as shown in FIG. 3, but are not limited thereto and may be freely designed by those skilled in the art. Of course.

The battery packaging material 50 included in the present invention may use a well-known pouch type battery packaging material conventionally used, or a battery in which a through hole having a smaller size is formed at a position corresponding to the through hole 40 formed in the electrode assembly. Exterior materials may also be used. In this case, the size of the through hole formed in the battery outer case is smaller than the size of the through hole formed in the electrode assembly because a sealing margin for sealing the battery outer case along the inner circumferential surface of the through hole is required.

4 is a perspective view of a secondary battery according to the present invention.

The secondary battery according to the present invention includes a through hole 40 penetrating the secondary battery as shown in Figure 4, the inside of the through hole is formed with a sealing portion in which the battery outer material is sealed along the inner peripheral surface.

In the secondary battery according to the present invention, the electrode assembly and the battery outer case are completely fixed and integrated by the additional sealing through the through hole.

The additional sealing step by the formation of the through hole is not particularly limited in order, and may seal the inner peripheral surface of the through hole at the same time when sealing the edge sealing portion of the battery packaging material, and finally after additional activation of the secondary battery It may be formed by. However, when the through hole is formed in the battery packaging material in advance, it is preferable to seal the through hole inner circumferential surface together when forming the corner sealing portion of the battery packaging material. This is to facilitate the electrolyte injection step.

The through hole may be formed using a jig designed to be pressurized for sealing to a corresponding portion according to the position and shape of the through hole, but is not limited thereto.

FIG. 4 is a perspective view of a secondary battery in which the positive lead 20 and the negative lead 30 protrude in the same direction, and the receiving portion of the electrode assembly is formed only on the lower battery outer side, but is not limited thereto.

5 illustrates a battery module 110 including a plurality of secondary batteries 50 according to the present invention, and FIG. 6 illustrates a battery module 110 including through holes 40 formed in the plurality of secondary batteries. It is a perspective view of an embodiment in which the fixed rod or cooling line 120 is installed.

The battery module according to the present invention secures a plurality of secondary batteries through the through-holes to prevent the separation or flow of the battery due to external pressure, or to maintain the unit battery at an appropriate temperature level through the cooling line safety of the battery module It can greatly improve the performance and provide the effect of improving the performance and lifespan.

Hereinafter, the content of the present invention will be described in more detail with reference to specific examples, but the following examples are provided to illustrate the effects of the present invention, and the scope of the present invention is not limited thereto.

Example

As shown in FIG. 4, a secondary through hole having a circular through hole having a size of 3% compared to a plane of the secondary battery is formed at a position spaced apart from each end of the secondary battery by an interval 1/6 of the length of the secondary battery. The battery was prepared.

The through-holes were formed in the electrode assembly and the battery packaging material in advance, and heat-sealing the edge sealing parts of the battery packaging material and the margin of the battery packaging material sealing portion of the inner circumferential surface of the through-hole using heat sealing jig to form the through holes.

Comparative example

A secondary battery was manufactured in the same manner as in Example, except that the through hole was not formed.

Experimental Example

The front drop experiment was performed on the batteries prepared in Examples and Comparative Examples, and the results are shown in Table 1 below.

In this experiment, each of 20 batteries was repeatedly performed, and the front dropping experiment was performed by 100 times of free-falling on the iron plate at a height of 180 cm so that the electrode terminal portion face downward.

Number of batteries shorted when dropped Example 0 Comparative example 15

As shown in Table 1, the cells of the example according to the present invention did not cause a short circuit in all 20 cells in the drop test. That is, by forming an additional through-sealing portion in the electrode assembly and the battery packaging material, the electrode assembly did not flow even during the fall, thereby preventing the internal short circuit of the secondary battery.

On the other hand, in most batteries according to the comparative example, the electrode assembly inside the battery enclosure was separated or flowed after approximately 85 drops, and deformation and internal short circuit of the battery were confirmed.

In addition, in the battery of the comparative example, it was confirmed that the amount of the electrolyte injected during the injection of the electrolyte greatly fell short of the target amount of pouring. That is, as a result of comparing the impregnation amount of the electrolyte solution by the electrode assembly under the same time condition (5 minutes) after the injection of the electrolyte solution, the battery of the comparative example showed an impregnation rate of about 60% compared to the battery of the example.

Therefore, it can be seen that the battery of the comparative example takes a long time to show the same electrolyte solution impregnation amount, which means that the battery manufacturing process time should be extended for a long time.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to be described. The scope of the present invention should be interpreted by the following claims, and all technical spirits within the equivalent scope thereof are It should be interpreted as being included in the scope of the present invention.

120 cooling line, 110 battery module, 20 positive lead, 30 negative lead, 50 battery enclosure, 40 through hole, 10 electrode assembly.

Claims (18)

A pouch type secondary battery comprising one or more through holes. The method of claim 1,
The through-holes of the pouch type secondary battery, characterized in that formed in at least one or more of an electrode assembly including a positive electrode, a negative electrode, a separator, and a pouch packaging material comprising the same. The method of claim 2,
The through-holes are pouch-type secondary battery, characterized in that formed in the same position so that the through-holes of the electrode assembly and the through-holes of the pouch packaging material to correspond to each other. The method of claim 2,
The through-hole of the electrode assembly and the through-hole of the pouch-type exterior material is formed in the same shape, the pouch type secondary battery. The method of claim 2,
The size of the through hole of the electrode assembly is larger than the size of the through hole of the corresponding pouch packaging material. The method of claim 5, wherein
The electrode assembly through hole is a pouch type secondary battery, characterized in that larger than the through hole of the pouch packaging material by the width of the additional sealing portion formed along the inner circumferential surface. The method of claim 1,
The at least one through hole is a pouch type secondary battery, characterized in that formed at equal intervals. The method of claim 1,
The at least one through hole is formed in the center of the battery along the long side (長 邊) of the pouch type secondary battery, the pouch type secondary battery. The method of claim 1,
The at least one through hole is formed in the center of the battery along the short side (短 邊) of the pouch type secondary battery, characterized in that the secondary battery. The method of claim 5, wherein
Pouch-type secondary battery, characterized in that the additional sealing portion is formed along the inner peripheral surface of the through-hole of the electrode assembly. The method of claim 1,
The through-hole is a pouch-type secondary battery, characterized in that formed in any one shape selected from the group consisting of a curvature angular, rectangular, triangular, rounded, elliptical, vertices. 12. The method of claim 11,
The through-hole is a pouch type secondary battery, characterized in that formed in a circular shape. The method of claim 1,
The total area of the at least one through hole is a pouch type secondary battery, characterized in that 2% to 20% of the planar area of the pouch type secondary battery. The method of claim 2,
The electrode assembly is a pouch type secondary battery, characterized in that any one selected from the structure of the jelly-roll type, stack type, stack / folding type, Z-stack / folding type. A battery module comprising the pouch type secondary battery according to any one of claims 1 to 14 as a unit cell. 16. The method of claim 15,
The battery module is a battery module, characterized in that the cooling line is connected through at least one through-hole formed in the unit cell. The method of claim 15,
The battery module is a battery module, characterized in that the unit cell fixing rod is connected through at least one through-hole formed in the unit cell. The method of claim 15,
The battery module includes a power tool; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Electric two-wheeled vehicles including E-bikes and E-scooters; Electric golf carts; Electric trucks; Battery module, characterized in that used as one or more power sources selected from the group consisting of medium and large devices of the electric commercial vehicle.

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