KR20230030851A - Battery cell and battery module including the same - Google Patents

Abstract

A battery cell according to an embodiment of the present invention comprises: a battery case in which an electrode assembly is mounted in a storage portion and which includes a sealing portion having a sealed outer periphery; and an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding outward from the battery case via the sealing portion. The sealing portion includes a gas discharge portion located adjacent to at least one of both sides of the electrode lead. The gas discharge portion is recessed toward the electrode assembly with respect to the sealing portion. The inner surface of the gas discharge portion is located closer to the electrode assembly than the inner surface of the sealing portion. The present invention can delay heat propagation between adjacent cells.

Description

Battery cell and battery module including the same {BATTERY CELL AND BATTERY MODULE INCLUDING THE SAME}

The present invention relates to a battery cell and a battery module including the same, and more particularly, to a battery cell that delays heat propagation between adjacent cells while easily discharging gas in the battery cell in an induced direction, and a battery module including the same it's about

As technology development and demand for mobile devices increase, demand for secondary batteries as an energy source is rapidly increasing. In particular, secondary batteries are of great interest as energy sources for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles as well as mobile devices such as mobile phones, digital cameras, laptops, and wearable devices.

Depending on the shape of the battery case, these secondary batteries are classified into cylindrical batteries and prismatic batteries in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries in which the electrode assembly is embedded in a pouch-type case made of an aluminum laminate sheet. do. Here, the electrode assembly embedded in the battery case is a power generating device capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive electrode and the negative electrode. It is classified into a jelly-roll type wound with a separator interposed and a stack type in which a plurality of positive and negative electrodes are sequentially stacked in a state in which a separator is interposed.

Among these, in particular, the pouch-type battery having a structure in which a stacked or stacked/folding type electrode assembly is embedded in a pouch-type battery case of an aluminum laminate sheet is gradually being used due to low manufacturing cost, small weight, and easy deformation shape. It is increasing.

However, as the energy density of battery cells increases recently, there is a problem in that the amount of gas generated inside the battery cells also increases. In the case of a conventional battery cell, it does not include a part through which gas generated inside the battery cell can be discharged, and thus the battery cell may experience a venting phenomenon due to gas generation. In particular, when a venting phenomenon occurs in a conventional battery cell, gas is discharged to a portion where sealing is weak. These gases are flammable gases and can heat adjacent cells, leading to ignition and explosion of adjacent cells.

Accordingly, there is a growing need to develop a battery cell in which gas discharge is directed in a direction in which heat propagation is minimized while gas discharge is effectively performed when a venting phenomenon occurs in the battery cell.

An object to be solved by the present invention relates to a battery cell that delays heat propagation between adjacent cells while easily discharging gas in a battery cell in an induced direction, and a battery module including the same.

The problem to be solved by the present invention is not limited to the above-mentioned problems, and problems not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. .

A battery cell according to an embodiment of the present invention includes a battery case in which an electrode assembly is mounted in a storage unit and includes a sealing unit having a sealed outer periphery; and an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding outwardly of the battery case via the sealing portion, wherein the sealing portion is located at a portion other than a portion where the electrode lead is located. A gas discharge part is located, the gas discharge part is recessed toward the electrode assembly based on the sealing part, and an inner surface of the gas discharge part is located closer to the electrode assembly than an inner surface of the sealing part.

An outer surface of the gas discharge unit may be positioned closer to the electrode assembly than an inner surface of the sealing unit.

A sealing strength of the gas discharge unit may be smaller than a sealing strength of the sealing unit.

The gas discharge unit may have a sealing strength of 40% or more to 90% or less based on the sealing strength of the sealing unit.

A thickness of the gas discharge unit may be equal to or smaller than a thickness of the sealing unit.

The gas discharge unit may be positioned to be spaced apart from the electrode lead.

A space between an outer surface of the gas outlet and the sealing portion may be open toward the outside of the battery cell.

The electrode lead may further include a lead film positioned at a portion corresponding to the sealing portion in at least one of the upper and lower portions of the electrode lead.

A battery module according to another embodiment of the present invention includes the battery cell described above.

The battery cells may be stacked in a direction in which the gas outlet is adjacent to a bottom surface.

The battery cells may be stacked in a direction in which the gas outlet is positioned below the electrode lead.

According to embodiments, the present invention is a battery cell including a gas discharge unit located in a portion other than a portion where the electrode lead is located in a sealing portion, and a battery module including the same, wherein the gas in the battery cell is easily induced in a direction. While being discharged, it is possible to delay the heat propagation between adjacent cells.

The effect of the present invention is not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

1 is a top view of a battery cell according to a comparative example.
FIG. 2 is an enlarged view of an end portion of the battery cell of FIG. 1 .
FIG. 3 is a view showing a path through which gas is discharged from an end of the battery cell of FIG. 1 .
4 is a top view of a battery cell according to an embodiment of the present invention.
FIG. 5 is an enlarged view of an end portion of the battery cell of FIG. 4 .
FIG. 6 is a view showing a path through which gas is discharged from an end of the battery cell of FIG. 4 .
FIG. 7 is an enlarged view of a gas outlet formed at an end of a battery cell of FIG. 4 .

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to the shown bar. In the drawings, the thickness is shown enlarged to clearly express the various layers and regions. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated.

In addition, throughout the specification, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

In addition, throughout the specification, when it is referred to as "planar image", it means when the target part is viewed from above, and when it is referred to as "cross-sectional image", it means when a cross section of the target part cut vertically is viewed from the side.

1 is a top view of a battery cell according to a comparative example. FIG. 2 is an enlarged view of an end portion of the battery cell of FIG. 1 .

Referring to FIGS. 1 and 2 , the battery cell 10 according to the comparative example includes a sealing portion 25 having an electrode assembly 11 mounted in a storage portion 21 and having a sealed outer periphery. Includes case 20. In addition, the conventional battery cell 10 includes an electrode lead 30 protruding outwardly of the battery case 20 via the sealing portion 25, and the upper and lower portions of the electrode lead 30 and the sealing portion ( 25), the lead film 40 is positioned between them.

FIG. 3 is a view showing a path through which gas is discharged from an end of the battery cell of FIG. 1 .

Referring to FIGS. 2 and 3 , when the internal pressure rises due to gas generation inside the battery cell 10, the battery cell 10 according to the comparative example has the weakest sealing strength, and the electrode lead 30 is located. A fracture portion 25V may be formed in the portion. Here, the fractured portion 25V may be a portion where the sealing surface of the sealing portion 25 is widened, ruptured, or broken due to an increase in internal pressure of the battery cell 10 .

However, in the case of the battery cell 10 according to the comparative example, there is a problem in that the sealing portion 25 where the electrode lead 30 is located is damaged. In addition, the portion where the electrode lead 30 is located is located very close to the electrode lead of the adjacent battery cell, so that the high-temperature flammable gas discharged from the ruptured portion 25V can quickly heat the adjacent battery cell. Accordingly, there is a problem in that heat propagation between the battery cells 10 may more easily occur in the battery module including the battery cells 10 according to the comparative example.

In addition, in the battery cell 10, the part where the sealing strength is the weakest in the sealing part 25 is the part where the electrode lead 30 is located, or the breakdown voltage of the battery cell 10 for forming the rupture part 25V Since it is relatively high, there is a problem in that the timing of gas discharge in the battery cell 10 may be too late.

Hereinafter, a battery cell according to an embodiment of the present invention will be described. However, although description will be made based on one end of both ends of the battery cell, it is not necessarily limited thereto, and the other end may be described with the same or similar content.

4 is a top view of a battery cell according to an embodiment of the present invention. FIG. 5 is an enlarged view of an end portion of the battery cell of FIG. 4 .

4 and 5, in the battery cell 100 according to an embodiment of the present invention, the electrode assembly 110 is mounted in the storage part 210 and the sealing part ( 250) including a battery case 200; an electrode lead 300 electrically connected to an electrode tab (not shown) included in the electrode assembly 110 and protruding outward of the battery case 200 via the sealing portion 250; and a lead film 400 positioned at a portion corresponding to the sealing portion 250 in at least one of the upper and lower portions of the electrode lead 300 .

The battery case 200 may be a laminate sheet including a resin layer and a metal layer. More specifically, the battery case 200 is made of a laminate sheet, and may be composed of an outer resin layer forming the outermost shell, a barrier metal layer to prevent penetration of materials, and an inner resin layer for sealing.

The electrode assembly 110 may have a structure of a jelly-roll type (winding type), a stack type (lamination type), or a combination type (stack/folding type). More specifically, the electrode assembly 110 may include an anode, a cathode, and a separator disposed between them.

The electrode lead 300 is electrically connected to an electrode tab (not shown) included in the electrode assembly 110 and protrudes outward from the battery case 200 via the sealing portion 250 . In addition, the lead film 400 is located at a portion corresponding to the sealing portion 250 in at least one of the upper and lower portions of the electrode lead 300 .

Accordingly, the lead film 400 prevents a short circuit from occurring in the electrode lead 300 during thermal fusion or press fusion together with the sealing portion 250, and sealability between the sealing portion 250 and the electrode lead 300. can improve

FIG. 6 is a view showing a path through which gas is discharged from an end of the battery cell of FIG. 4 . FIG. 7 is an enlarged view of a gas outlet formed at an end of a battery cell of FIG. 4 .

Referring to FIGS. 5 and 6 , in the battery cell 100 according to the present embodiment, the sealing part 250 includes a gas discharge part 255 located in a part other than the part where the electrode lead 300 is located. . Here, the gas discharge unit 255 may be a part where the sealing surface of the sealing unit 250 is widened, ruptured, or broken due to an increase in internal pressure of the battery cell 100 .

More specifically, based on the upper or lower surface of the battery cell 100 , the gas discharge unit 255 may be located on at least one of both side surfaces of the electrode lead 300 in the sealing unit 250 . In addition, the gas discharge unit 255 may be located in the sealing unit 250 and spaced apart from the electrode lead 300 .

For example, the gas discharge unit 255 is located in the sealing unit 250 on the same side as the electrode lead 300, but the gas discharge unit 255 is located in the sealing unit 250 where the electrode lead 300 is located and It may be located between the ends of the sealing part 250 . In particular, in the sealing part 250 , the gas discharge part 255 may be located closer to the end of the sealing part 250 than the electrode lead 300 .

Accordingly, as shown in FIG. 6 , gas discharged when the internal pressure of the battery cell 100 is increased is not discharged to the portion of the sealing portion 250 where the electrode lead 300 is located, except for the portion where the electrode lead 300 is located. It can be discharged through the gas outlet 255 located in the portion. That is, the gas discharge unit 255 may guide the discharge direction of the gas discharged when the internal pressure of the battery cell 100 increases in a specific direction.

Referring to FIGS. 5 and 7 , in the battery cell 100 according to the present embodiment, the gas exhaust portion 255 may be recessed toward the electrode assembly 110 based on the sealing portion 250 . In other words, the gas discharge part 255 may be recessed in a direction opposite to the direction in which the electrode lead 300 protrudes with respect to the sealing part 250 .

Referring to FIG. 7 , the gas discharge unit 255 may be recessed toward the electrode assembly 110 based on the outer surface B of the sealing unit 250 . More preferably, the gas discharge portion 255 may be recessed toward the electrode assembly 110 based on the inner surface (A) of the sealing portion 250 .

Here, as the inner surface (A′) of the gas discharge unit 255 is positioned adjacent to the electrode assembly 110, the degree of internal pressure required at the time of gas discharge of the battery cell 100 may decrease. In other words, as the inner surface (A′) of the gas discharge unit 255 is located closer to the electrode assembly 110 than the inner surface (A) of the sealing part 250, according to the expansion behavior of the battery cell 100 More pressure may be applied to the inner surface A′ of the gas outlet 255 .

That is, when gas is discharged through the gas outlet 255 formed at the same location as in the present embodiment, the degree of internal pressure required at the time of gas discharge from the battery cell 100 may be reduced. In particular, as the inner surface (A′) of the gas discharge unit 255 is located closer to the electrode assembly 110 than the inner surface (A) of the sealing unit 250, the demand at the time of gas discharge from the battery cell 100 The amount of internal pressure can gradually decrease.

For example, the inner surface (A′) of the gas discharge part 255 may be located closer to the electrode assembly 110 than the inner surface (A) of the sealing part 250 . As another example, the outer surface (B′) of the gas discharge part 255 may be located closer to the electrode assembly 110 than the inner surface (A) of the sealing part. As another example, the inner surface (A′) of the gas discharge part 255 is located closer to the electrode assembly 110 than the inner surface (A) of the sealing part 250, and the outer surface of the gas discharge part 255 (B′) may be located closer to the electrode assembly 110 than the inner surface of the sealing part. Here, the inner surface (A′) of the gas outlet 255 may be positioned closer to the electrode assembly 110 than the outer surface (B′) of the gas outlet 255 .

However, the positions of the inner surface (A') and the outer surface (B') of the gas discharge part 255 are not limited to those of the sealing part 250, and the gas discharge part 250 has a higher gas emission than the inner surface (A) of the sealing part 250. If the discharge unit 255 is located adjacent to the electrode assembly 110, it is included in this embodiment.

Accordingly, in the battery cell 100 according to the present embodiment, the positions of the inner surface (A′) and the outer surface (B′) of the gas discharge unit 255 are based on the inner surface (A) of the sealing unit 250. By adjusting to , it is possible to adjust the time point at which the gas inside the battery cell 100 is discharged through the gas discharge unit 255 .

In addition, a space between the outer surface (B′) of the gas discharge unit 255 and the sealing unit 250 may be open toward the outside of the battery cell 100 . In other words, the space between the outer surface (B′) of the gas discharge part 255 and the sealing part 250 may be a portion that is not fused during thermal fusion or press fusion.

Referring to FIGS. 5 and 7 , the space between the outer surface (B′) of the gas discharge unit 255 and the sealing unit 250 is a space where the gas discharge unit 255 is recessed based on the sealing unit 250. The portion may have a first width d1 and a second width d2 between the outer surface B' of the gas outlet 255 and the outer surface B of the sealing part 250 .

The gas discharge unit 255 may adjust the degree of gas discharge by adjusting the first width d1. For example, the gas discharge unit 255 may reduce the amount of gas discharge when the first width d1 is relatively small, and increase the amount of gas discharge when the first width d1 is relatively large.

Accordingly, the battery cell 100 according to the present embodiment adjusts the first width d1 between the outer surface B 'of the gas discharge portion 255 and the sealing portion 250, so that the gas discharge portion ( 255, it is possible to adjust the degree to which the gas inside the battery cell 100 is discharged.

In contrast, when the first width d1 between the outer surface B' of the gas discharge unit 255 and the sealing unit 250 is too small or large, the degree of gas discharge according to the increase in internal pressure of the battery cell 100 It may be difficult to prevent ignition and explosion due to heat propagation between adjacent battery cells 100 .

In addition, the gas discharge unit 255 may adjust the gas discharge time by adjusting the second width d2 . For example, in the gas discharge unit 255, the gas discharge time may be delayed as the second width d2 is relatively small, and the gas discharge time may be increased as the second width d2 is relatively large.

Accordingly, the battery cell 100 according to the present embodiment adjusts the second width d2 between the outer surface B' of the gas outlet 255 and the outer surface B of the sealing part 250. Accordingly, the degree and/or timing at which the gas inside the battery cell 100 is discharged through the gas discharge unit 255 may be adjusted.

In contrast, when the second width d2 between the outer surface B′ of the gas discharge unit 255 and the sealing unit 250 is too small or large, the gas discharge timing according to the increase in internal pressure of the battery cell 100 If this is too fast, the usage period of the battery cell 100 may be very short, or if it is too slow, it may be difficult to prevent ignition and explosion due to heat propagation between adjacent battery cells 100 .

Also, the sealing strength of the gas discharge unit 255 may be smaller than that of the sealing unit 250 . The sealing strength may be defined as the amount of pressure required to break the gas discharge unit 255 or the sealing unit 250 .

Here, the gas discharge unit 255 may have a sealing strength of 40% or more to 90% or less based on the sealing strength of the sealing unit 250 . More specifically, the gas discharge unit 255 may have a sealing strength of 43% or more to 89% or less based on the sealing strength of the sealing unit 250 . For example, the gas discharge unit 255 may have a sealing strength of 45% or more to 87% or less based on the sealing strength of the sealing unit 250 . Here, the sealing strength of the sealing portion 250 may mean the sealing strength of the sealing portion 250 at the portion where the electrode lead 300 is located.

Accordingly, the battery cell 100 according to the present embodiment has a sealing strength in which the sealing strength of the gas discharge unit 255 is included in the above-mentioned range, so that when the internal pressure of the battery cell 100 increases, the sealing unit 250 Gas may be discharged through the non-gas discharge unit 255 .

On the other hand, when the sealing strength of the gas discharge unit 255 is less than 40%, the time of gas discharge due to the increase in internal pressure of the battery cell 100 becomes too fast, and the use period of the battery cell 100 becomes very short. there is. In addition, when the sealing strength of the gas discharge unit 255 exceeds 90%, the gas discharge time is too slow, and it may be difficult to prevent ignition and explosion due to heat propagation between adjacent battery cells 100 .

Also, in this embodiment, the thickness of the gas discharge portion 255 may be equal to or smaller than the thickness of the sealing portion 250 . More specifically, as the thickness of the gas outlet 255 is smaller than that of the sealing portion 250 , the sealing strength of the gas outlet 255 may be smaller than that of the sealing portion 250 . For example, as shown in FIGS. 5 to 7 , the thickness of the gas discharge unit 255 may be smaller than that of the sealing unit 250 . However, it is not limited thereto, and the thickness of the gas discharge unit 255 may be appropriately adjusted in consideration of the time of gas discharge.

Accordingly, the battery cell 100 according to the present embodiment adjusts the thickness of the gas outlet 255 based on the thickness of the sealing portion 250, and enters the battery cell 100 through the gas outlet 255. It is possible to adjust the timing of gas discharge.

A battery module according to another embodiment of the present invention includes the battery cell 100 described above. In particular, in the battery module, the battery cells 100 may be stacked in a direction in which a side surface on which the electrode lead 300 is not positioned touches the bottom surface. Here, the battery cells 100 may be stacked in a direction in which the gas outlet 255 is adjacent to the bottom surface. At this time, the battery cells 100 may be stacked in a direction in which the gas outlet 255 is positioned below the electrode lead 300 .

Accordingly, in the present embodiment, the gas discharge unit 255 of the battery cell 100 is located adjacent to the bottom surface, so that the gas discharged through the gas discharge unit 255 when the internal pressure of the battery cell 100 increases is discharged from the bottom surface. It can be discharged towards the surface. That is, in this embodiment, the gas discharged from some of the battery cells 100 is discharged toward the bottom surface, thereby minimizing the damage caused by the high-temperature inflammable gas discharged from the battery cells 100 to the adjacent battery cells 100. and heat propagation to adjacent battery cells 100 can also be effectively delayed.

Hereinafter, the content of the present invention will be described through more specific examples, but the following examples are intended to illustrate the present invention by way of example, and the scope of the present invention is not limited thereto.

<Example 1>

A battery cell was manufactured in which the outer surface of the battery case was sealed in a state in which an electrode assembly in which a positive electrode and a negative electrode were alternately stacked in order and a separator was interposed between the positive electrode and the negative electrode was housed in a battery case.

Here, in the sealing part where the electrode lead is located, the gas discharge unit is formed in a portion other than the portion where the electrode lead is located. In particular, the gas discharge part is recessed toward the inside of the battery case based on the outer surface of the sealing part, like the battery cells of FIGS. 5 to 7 .

<Example 2>

In Example 1, the gas discharge part is recessed toward the inside of the battery case with respect to the outer surface of the sealing part at a depth of 1.38 times the depth at which the gas discharge part of Example 1 is recessed. A battery cell was manufactured in the same manner as in Example 1 except for this point.

<Experimental Example- Measurement of sealing strength at the time of venting>

For the battery cells of Examples 1 and 2, the time point at which breakage occurred in the sealing portion of each battery cell was confirmed using CAE (Computer-Aided Engineering) simulation, and the results are shown in Table 1 . Here, the sealing strength at the time of venting may mean the sealing strength of the portion where the gas discharge unit is located compared to the sealing strength of the sealing portion where the electrode lead is located.

Example 1 Example 2 Sealing strength at the time of venting (%) 85 49

<Analysis of test results>

Referring to Table 1 and FIGS. 5 to 7, as in Example 1 and Example 2, when the gas discharge unit 255 is included in the sealing unit 250, the sealing unit when the internal pressure of the battery cell 100 increases. It can be confirmed that the gas outlet 255, not the 250, is broken. In addition, in Examples 1 and 2, the sealing strength at the time of breakage of the gas discharge unit 255 was 85% and 49%, respectively, of the sealing unit 250 at the portion where the electrode lead 300 is located It can be seen that it is relatively low compared to the sealing strength.

Accordingly, when the gas discharge unit 255 is included in the sealing unit 250 as in Example 1 and Example 2, the sealing strength at the time when the gas is vented when the internal pressure of the battery cell 100 is increased is relatively high. You can see it getting lower. That is, in the case of Examples 1 and 2, when the internal pressure of the battery cell 100 increases, the gas can be discharged to the outside more quickly than the battery cell 10 of the comparative example without the gas discharge unit 255.

In particular, when comparing Example 1 and Example 2, when the depth at which the gas discharge portion 255 is indented is greater than the depth in Example 1, as in Example 2, the time point at which the gas discharge portion 255 is broken It can be seen that the sealing strength is relatively low.

Accordingly, as in Example 2, it can be confirmed that the greater the depth at which the gas outlet 255 is recessed, the lower the sealing strength when the gas is vented when the internal pressure of the battery cell 100 is increased. That is, as in Example 2, when the internal pressure of the battery cell 100 increases, the gas can be discharged to the outside more quickly as the depth of the indentation of the gas outlet 255 increases.

Meanwhile, one or more battery modules according to the present embodiment may be packaged in a pack case to form a battery pack.

The battery module described above and the battery pack including the battery module may be applied to various devices. Such devices may be applied to means of transportation such as electric bicycles, electric vehicles, hybrid vehicles, etc., but the present invention is not limited thereto and is applicable to various devices capable of using a battery module and a battery pack including the same, which is also applicable to the present invention. Belongs to the scope of the right of invention.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It falls within the scope of the right of invention.

100: battery cell
110: electrode assembly
200: battery case
210: storage unit
250: sealing part
255: gas outlet
300: electrode lead
400: lead film

Claims (11)

a battery case including a sealing part having an outer periphery sealed in which the electrode assembly is mounted in the housing part; and
An electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding outward of the battery case via the sealing portion,
The sealing part includes a gas discharge part located in a part other than the part where the electrode lead is located,
The gas discharge portion is recessed toward the electrode assembly based on the sealing portion,
An inner surface of the gas discharge unit is positioned closer to the electrode assembly than an inner surface of the sealing unit. In paragraph 1,
An outer surface of the gas discharge part is positioned closer to the electrode assembly than an inner surface of the sealing part. In paragraph 1,
The battery cell of claim 1 , wherein the sealing strength of the gas discharge unit is smaller than the sealing strength of the sealing unit. In paragraph 3,
The battery cell of claim 1 , wherein the gas discharge unit has a sealing strength of 40% or more to 90% or less based on the sealing strength of the sealing unit. In paragraph 4,
A battery cell in which the thickness of the gas discharge part is equal to or smaller than the thickness of the sealing part. In paragraph 1,
The battery cell of the battery cell in which the gas discharge part is located spaced apart from the electrode lead. In paragraph 1,
A battery cell in which a space between an outer surface of the gas discharge part and the sealing part is open toward the outside of the battery cell. In paragraph 1,
The battery cell further comprising a lead film positioned at a portion corresponding to the sealing portion in at least one of the upper and lower portions of the electrode lead. A battery module comprising the battery cell of claim 1. In paragraph 9,
The battery module of claim 1 , wherein the battery cells are stacked in a direction adjacent to a bottom surface of the gas outlet. In paragraph 10,
The battery module of claim 1 , wherein the battery cells are stacked in a direction in which the gas discharge portion is located below the electrode lead.

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