KR20220071110A - Battery cell and battery module including the same - Google Patents

Abstract

A battery cell according to an embodiment of the present invention includes: an electrode assembly including a plurality of electrode plates stacked with a separator interposed therebetween; and a battery case in which the electrode assembly is mounted in a storage unit, wherein the electrode assembly includes a plurality of electrode tabs each extending from the plurality of electrode plates, the plurality of electrode tabs are arranged with the same polarity on the same line to form an electrode tab arrangement, and at least one protective member is bonded to ends of the plurality of electrode tabs.

Description

A battery cell and a 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 with improved safety and a battery module including the same.

As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. In particular, secondary batteries are of great interest not only as mobile devices such as mobile phones, digital cameras, notebooks, and wearable devices, but also as energy sources for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles.

According to 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 of an aluminum laminate sheet. do. Here, the electrode assembly built into the battery case is a power generating element that can be charged and discharged by having 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, which is wound therebetween, and a stack type, in which a plurality of positive and negative electrodes are interposed in a separator and sequentially stacked.

Among them, in particular, a pouch-type battery having a structure in which a stack-type or stack/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, easy deformation, etc. is increasing

1 is an exploded perspective view of a conventional battery cell. FIG. 2 is an enlarged perspective view of an end of an electrode assembly included in the battery cell of FIG. 1 .

1 and 2, the conventional battery cell 10 is an electrode assembly 30 including a positive electrode 33, a negative electrode 34, and a separator 35 interposed therebetween in the battery case 20. and an electrolyte solution. Here, the secondary battery 10 has a structure in which the two electrode leads 40 and 41 electrically connected to the positive electrode tabs 31 and the negative electrode tabs 32 of the electrode assembly 30 are sealed so as to be exposed to the outside. consist of.

Here, in order to test the safety of a battery cell in the form of a pouch such as the conventional battery cell 10 during use, a short circuit occurs by penetrating a collision or a sharp metal foreign body that applies an external force to a battery in a fully charged state, and Check for ignition.

At this time, when a short circuit occurs in some electrodes in the battery cell 10, the current moves from the non-shorted electrode to the electrode in which the short circuit occurs through the welding surfaces of the electrode tabs 31 and 32. An overcurrent phenomenon occurs. Accordingly, there is a problem in that the electrode in which the short circuit occurs is heated due to the overcurrent phenomenon, and then reaches a thermal runaway state to cause ignition. That is, there is a need to develop a battery cell capable of securing safety by suppressing overcurrent caused by other electrodes even when a short circuit occurs in some electrodes in the battery cell.

An object of the present invention is to provide a battery cell with improved safety by suppressing overcurrent that may be generated between a plurality of electrode plates in the battery cell, 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 the problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the present specification and the accompanying drawings. .

A battery cell according to an embodiment of the present invention includes an electrode assembly including a plurality of electrode plates stacked with a separator interposed therebetween; and a battery case in which the electrode assembly is mounted to the receiving part, wherein the electrode assembly includes a plurality of electrode tabs respectively extending from the plurality of electrode plates, and the plurality of electrode tabs are on the same line with the same polarity are arranged on each other to form an electrode tab arrangement, and at least one protective member is bonded to the ends of the plurality of electrode tabs.

One of the protection members of the at least one protection member is bonded to some of the ends of the plurality of electrode tabs, and the other of the at least one protection member is attached to the remaining portions of the ends of the plurality of electrode tabs. The protection member may be bonded.

The protection member may be bonded to each end of the plurality of electrode tabs.

The protection member may be broken when heat equal to or greater than the first temperature is applied.

The first temperature may be a temperature of resistance heat generated when a current equal to or greater than a first current flows through the electrode plate.

The first current may be a current of 10C or more.

The protective member may include a Pb-Sn (lead-tin) alloy.

The protective member may be made of an alloy containing 30 wt% to 45 wt% of lead (Pb) and 55 wt% to 70 wt% of tin (Sn).

It may further include an electrode lead electrically connected to the electrode tab assembly and protruding outwardly of the battery case.

An end of the electrode tab arrangement may be in contact with the electrode lead.

An end of the protection member may be in contact with the electrode lead.

The battery case may include a sealing portion having an outer periphery sealed by thermal fusion, and a lead film positioned at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead.

The electrode lead includes a first electrode lead part and a second electrode lead part, the first electrode lead part extends along an end of the electrode tab arrangement, and the second electrode lead part is separated from the first electrode lead part. It may protrude outwardly of the battery case.

The lead film may be positioned on the second electrode lead part.

A battery cell manufacturing method according to an embodiment of the present invention includes a pre-welding step of bonding a protective member to an electrode tab formed to extend from an electrode plate; an electrode assembly manufacturing step of manufacturing an electrode assembly by interposing a separator between the plurality of electrode plates to which the protection member is bonded; and a welding step in which the plurality of electrode tabs included in the electrode assembly are stacked with the same polarity to form an electrode tab arrangement, and an end of the electrode tab stack and the electrode lead are in contact with each other.

The method may further include a packaging step of mounting the electrode assembly electrically connected to the electrode lead to the receiving part of the battery case.

The battery module according to another embodiment of the present invention may include the aforementioned battery cells.

According to embodiments, the present invention provides a battery cell including a plurality of electrode plates having a protective member bonded to an end of an electrode tab and a battery module including the same, to be generated between the plurality of electrode plates in the battery cell. Possible overcurrent can be suppressed, and safety can be improved.

Effects of the present invention are not limited to the above-described effects, and effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention pertains from the present specification and accompanying drawings.

1 is an exploded perspective view of a conventional battery cell.
FIG. 2 is an enlarged perspective view of an end of an electrode assembly included in the battery cell of FIG. 1 .
3 is an exploded perspective view of a battery cell according to the present embodiment.
4 is an enlarged perspective view of an end of an electrode assembly included in the battery cell of FIG. 2 .
5 is an enlarged perspective view of an end of an electrode plate included in the electrode assembly of FIG. 3 .
6 is an enlarged perspective view of an end of the electrode assembly when a short circuit occurs in some of the electrode assemblies of the battery cell of FIG. 2 .
7 is a flowchart illustrating a method of manufacturing a battery cell according to the present embodiment.

Hereinafter, with reference to the accompanying drawings, various embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in several different forms and is not limited to the embodiments described herein.

In order to clearly explain 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 indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar. In order to clearly express various layers and regions in the drawings, the thicknesses are enlarged. And in the drawings, for convenience of description, the thickness of some layers and regions are exaggerated.

In addition, throughout the specification, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

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

3 is an exploded perspective view of a battery cell according to the present embodiment. 4 is an enlarged perspective view of an end of an electrode assembly included in the battery cell of FIG. 2 .

3 and 4 , the battery cell 100 according to the present embodiment includes an electrode assembly 300 including a plurality of electrode plates 330 and 340 stacked with a separator (not shown) interposed therebetween, and The electrode assembly 300 includes a battery case 200 mounted in the receiving part 230 . Here, the battery cell 100 may include an electrolyte solution together with the electrode assembly 300 inside the battery case 200 . Here, the two electrode leads 400 and 410 electrically connected to the plurality of electrode tabs 330 and 340 extending from the plurality of electrode plates 330 and 340 of the electrode assembly 300 are exposed to the outside. It may be formed in a sealed structure as much as possible.

One example. The battery case 200 is a pouch-type battery case, in which the electrode assembly 300 is seated and the case body 210 including a concave-shaped accommodating part 230 that can contain an electrolyte solution and the case body 210 in the case body 210 . The cover 220 may be integrally connected. In addition, in the battery case 200 , the outer periphery of the case body 210 and the cover 220 is fused to form a sealing part, so that the inner space can be sealed. However, the embodiment of the present invention is not limited to the above-described structure, and a battery case of a secondary battery having a general structure may be substituted.

For example, the electrolyte means an electrolyte in a liquid state, ions may move between the positive electrode and the negative electrode, and the secondary battery may be charged and discharged through ion exchange between the positive electrode and the negative electrode. Examples of the electrolyte used in the present invention include organic liquid electrolytes, inorganic liquid electrolytes, solid polymer electrolytes, gel-type polymer electrolytes, solid inorganic electrolytes, molten inorganic electrolytes, etc., which can be used in the manufacture of lithium secondary batteries. not.

Hereinafter, the remaining components in the battery cell 100 except for the battery case 200 will be mainly described.

3 and 4 , in the battery cell 100 according to the present embodiment, the electrode assembly 300 may be a stacked electrode assembly or a stacked/folding electrode assembly. However, in FIG. 4 , the expression of the separator (not shown) included in the electrode assembly 300 is omitted, and in the battery cell 100 according to the present embodiment, the separator (not shown) is the electrode assembly 300 . It may be interposed between the positive electrode plate 330 and the negative electrode plate 340 in the electrode assembly 300 according to the shape of the electrode assembly 300 .

In addition, the electrode assembly 300 includes a plurality of electrode tabs 310 and 320 respectively extending from the plurality of electrode plates 330 and 340 , and the plurality of electrode tabs 310 and 320 have the same polarity. may be arranged on each other to form an electrode tab arrangement.

For example, in the electrode assembly 300 , a plurality of positive electrode tabs 310 extending from the plurality of positive electrode plates 330 may be arranged with each other to form a positive electrode tab arrangement, and extending from the plurality of negative electrode plates 340 . A plurality of negative electrode tabs 320 formed by being formed may form a negative electrode tab arrangement arranged with each other.

5 is an enlarged perspective view of an end of an electrode plate included in the electrode assembly of FIG. 3 . 5 (a) is an enlarged perspective view of an end of the electrode plate in which the short circuit phenomenon does not occur, and FIG. 5 (b) is an enlarged perspective view of the end portion of the electrode plate in which the short circuit phenomenon occurs.

3 to 5 ( a ), in the electrode assembly 300 , each of the electrode plates 330 and 340 may be formed by extending the electrode tabs 310 and 320 , and the electrode tabs 310 and 320 . At least one protection member (315, 325) may be bonded to the ends.

More specifically, in the electrode assembly 300 , one protection member 315 , 325 of the at least one protection member 315 , 325 is bonded to some of the ends of the plurality of electrode tabs 310 and 320 , and , the other one of the at least one protection member 315 and 325 may be bonded to the remaining part of the ends of the plurality of electrode tabs 310 and 320 .

For example, the electrode assembly 300 includes two protective members 315 and 325 , and one of the two protective members 315 and 325 is bonded to some of the ends of the plurality of electrode tabs 310 and 320 . and the other one of the two protection members 315 and 325 may be bonded to the remaining part of the ends of the plurality of electrode tabs 310 and 320 . However, the present invention is not limited thereto, and in the case of including two or more protection members 315 and 325 , some of the ends of the plurality of electrode tabs 310 and 320 are joined to each of the protection members 315 and 325 . If there is, it may be included in the present embodiment.

Also, in the electrode assembly 300 , protective members 315 and 325 may be bonded to the ends of the plurality of electrode tabs 310 and 320 , respectively.

For example, as shown in FIG. 4 , the electrode assembly 300 includes a plurality of protection members 315 and 325 , and the protection members 315 and 325 are provided at ends of the plurality of electrode tabs 310 and 320 , respectively. is connected. More specifically, in the electrode assembly 300 , the electrode tabs 310 and 320 include electrode tab portions 311 and 321 and protection members 315 and 325 , but ends of the electrode tab portions 311 and 321 and the protection member 315 . , 325) may be bonded to each other. More specifically, the first protective member 315 may be bonded to each end of the positive electrode tab part 311 , and the second protective member 325 may be bonded to each end of the negative electrode tab part 321 .

Referring to FIG. 5B , the protection members 315 and 325 may be made of a material that is cut off when heat equal to or greater than a first temperature is applied. Here, the first temperature may be a temperature when an abnormal phenomenon such as a short circuit occurs in the electrode plates 330 and 340 and an overcurrent flows. More specifically, it may be the temperature of resistance heat generated when a current equal to or greater than the first current flows through the electrode plates 330 and 340 . Here, the first current may be 10C (cirate). That is, the protection members 315 and 325 may be cut off as a current of 10C or more flows. In addition, the first temperature may be a temperature of 100 degrees Celsius or more. That is, the protection members 315 and 325 may be cut as heat at a temperature of 100 degrees Celsius or more is transferred.

Accordingly, when a current of 10C or more flows in some of the plurality of electrode plates 330 and 340 and/or when heat of a temperature of 100 degrees Celsius or more is transferred, the protection members 315 and 325 may be cut off. can That is, even if a short circuit occurs in some of the plurality of electrode plates 330 and 340 , the protection members 315 and 325 of the electrode plates 330 and 340 in which the short circuit occurs are cut, and the short circuit occurs. Electron movement between the electrode plates 330 and 340 and the electrode plates 330 and 340 in which the short circuit does not occur may be restricted. That is, by preventing an overcurrent phenomenon of the electrode plates 330 and 340 in which the short circuit occurs, stability may be improved.

Here, when a current of less than 10C (cirate) flows in some of the plurality of electrode plates 330 and 340 and/or when heat of a temperature of less than 100 degrees Celsius is transmitted, the protection members 315 and 325 are cut off. may not support This is because some of the plurality of electrode plates 330 and 340 are simply heated, and since the amount of heat does not exceed the amount of heat emitted, it does not reach the ignition mode of the battery cell 100 .

On the other hand, if the protection members 315 and 325 are cut off when a current of less than 10C (cirrate) flows and/or when heat of a temperature of less than 100 degrees Celsius is transferred, the electrode plates 330 and 340 . There is a problem in that the current may be cut off even though the electrode plate is a simple heat-generating electrode plate in which no abnormal phenomenon occurs.

The protection members 315 and 325 may be formed of zinc, tin, and lead as a main component, or an alloy containing these as main components. For example, the protection members 315 and 325 may include a Pb-Sn (lead-tin) alloy. However, the protective members 315 and 325 are not limited to the above-described materials, and may include a material included in a typical fuse.

When the protection members 315 and 325 include a Pb-Sn (lead-tin) alloy, the protection members 315 and 325 contain 30% to 45% by weight of lead (Pb) and 55% to 70% by weight of lead (Pb). It may be made of an alloy containing tin (Sn). More specifically, the protection members 315 and 325 may be made of an alloy including 33 wt% to 43 wt% of lead (Pb) and 57 wt% to 67 wt% of tin (Sn). For example, the protection members 315 and 325 may be made of an alloy including 35 wt% to 40 wt% of lead (Pb) and 60 wt% to 65 wt% of tin (Sn).

Accordingly, the protection members 315 and 325 include a Pb-Sn (lead-tin) alloy at a ratio in the above-described range, and the solid according to the heating temperature generated in the electrode plates 330 and 340 in which the short-circuit phenomenon occurs. A phase change may proceed from the to the liquid. That is, according to the phase change of the protection members 315 and 325 , the protection members 315 and 325 of the electrode plates 330 and 340 in which the short circuit occurs may be cut off, and the electrode plates 330 and 340 in which the short circuit occurs. can limit the flow of electrons. That is, by preventing an overcurrent phenomenon of the electrode plates 330 and 340 in which the short circuit occurs, stability may be improved.

3 and 4 , the battery cell 100 according to the present embodiment is electrically connected to the electrode tab arrangement, and the electrode leads 400 and 410 protrude outward of the battery case 200 . includes In addition, the battery case 200 includes a sealing portion 240 having a structure in which the outer periphery is sealed by thermal fusion, and at least one of the upper and lower portions of the electrode leads 400 and 410, the sealing portion 240 is It may include a lead film 500 positioned in the corresponding portion.

More specifically, the positive electrode tab arrangement formed by arranging a plurality of positive electrode tabs 310 to each other may be electrically connected to the positive electrode lead 400 , and the negative electrode formed by arranging a plurality of negative electrode tabs 320 to each other. The tab arrangement may be electrically connected to the negative lead 410 .

Here, electrode leads 400 and 410 may be bonded to each other at the ends of the electrode tab assembly. More specifically, the positive electrode tab arrangement formed by arranging a plurality of positive electrode tabs 310 to each other may be bonded to the positive electrode lead 400 , and the negative electrode tab formed by arranging a plurality of negative electrode tabs 320 to each other. The arrangement may be bonded to the negative lead 410 and each other. For example, the ends of the electrode tab assembly and the electrode leads 400 and 410 may be joined to each other by welding or thermal fusion.

Also, at the end of the electrode tab assembly, ends of the protection members 315 and 325 bonded to the plurality of electrode tabs 310 and 320 may be bonded to the electrode leads 400 and 410 . More specifically, an end of the first protection member 315 bonded to each end of the plurality of positive electrode tabs 310 may be bonded to the positive electrode lead 400 , and each of the plurality of negative electrode tabs 320 may be bonded to each other. An end of the second protective member 325 bonded to the end may be bonded to the negative electrode lead 410 . For example, the ends of the protection members 315 and 325 and the electrode leads 400 and 410 may be joined to each other by welding or heat sealing.

Also, referring to FIGS. 3 and 4 , in the battery cell 100 according to the present embodiment, the electrode leads 400 and 410 may include a first electrode lead part and a second electrode lead part. Here, the first electrode lead part extends along an end of the electrode tab arrangement in which a plurality of electrode tabs 310 and 320 are arranged with each other, and the second electrode lead part is separated from the first electrode lead part from the battery case. (200) may protrude outward.

Here, an end of the electrode tab assembly may be bonded to the first electrode lead portion of the electrode leads 400 and 410 . More specifically, the positive electrode tab arrangement formed by arranging a plurality of positive electrode tabs 310 to each other may be bonded to the first electrode lead portion of the positive electrode lead 400 , and the plurality of negative electrode tabs 320 may be connected to each other. The negative electrode tab arrangement formed by being arranged with each other may be bonded to the first electrode lead part of the negative electrode lead 410 . For example, an end of the electrode tab assembly and the first electrode lead portion of the electrode leads 400 and 410 may be welded or thermally welded to each other.

Also, at the end of the electrode tab assembly, ends of the protection members 315 and 325 bonded to the plurality of electrode tabs 310 and 320 may be bonded to the electrode leads 400 and 410 . More specifically, an end of the first protection member 315 bonded to each end of the plurality of positive electrode tabs 310 may be bonded to the first electrode lead portion of the positive electrode lead 400 , and the plurality of positive electrode tabs 310 may be bonded to each other. Ends of the second protection member 325 bonded to each end of the negative electrode tabs 320 may be bonded to the first electrode lead portion of the negative electrode lead 410 . For example, the ends of the protection members 315 and 325 and the first electrode lead portions of the electrode leads 400 and 410 may be welded or thermally welded to each other.

Here, the lead film 500 may be positioned on the second electrode lead part. More specifically, the lead film 500 may be positioned at a portion corresponding to the sealing part 240 in the second electrode lead part.

6 is an enlarged perspective view of an end of the electrode assembly when a short circuit occurs in a part of the electrode assembly of the battery cell of FIG. 2 .

3 to 6 , in the battery cell 100 according to the present embodiment, when a short circuit occurs in some of the plurality of electrode plates 330 and 340, the corresponding electrode plates 330 and 340 are The protection members 315 and 325 connected to the electrode tabs 310 and 320 may be cut off. Here, in the case of one of the plurality of electrode plates 330 and 340 in which a short circuit does not occur among some of the electrode plates, the protection members 315 and 325 may be maintained without being cut off.

Accordingly, in the electrode plates 330 and 340 in which the short circuit has occurred, as the protective members 315 and 325 are cut off, the movement of electrons from the electrode plates 330 and 340 in which the short circuit does not occur may be restricted. An overcurrent phenomenon and a thermal runaway phenomenon can be prevented. In addition, the electrode plates 330 and 340 in which the short circuit does not occur can normally perform a battery function unlike the electrode plates 330 and 340 in which the short circuit occurs, so that the A sudden shutdown can be prevented.

7 is a flowchart illustrating a method of manufacturing a battery cell according to the present embodiment.

Referring to Figure 7, the battery cell manufacturing method according to an embodiment of the present invention, a pre-welding step (S10); electrode assembly manufacturing step (S20); and a welding step (S30).

5 and 7, in the pre-welding step (S10), the protection members 315 and 325 are respectively bonded to the ends of the electrode tab parts 311 and 321 which are formed to extend from the electrode plates 330 and 340, respectively. may be a step. For example, the end portions of the electrode tab portions 311 and 321 and the protection members 315 and 325 may be welded or thermally welded to each other.

3, 4 and 7, the electrode assembly manufacturing step (S230) is performed by interposing a separator (not shown) between the plurality of electrode plates 330 and 340 to which the protection members 315 and 325 are bonded. The electrode assembly 300 may be manufactured. In this case, the electrode assembly 300 may be manufactured by a stack type or stack/fold type assembly method.

3, 4 and 7, in the welding step (S30), a plurality of electrode tabs 310 and 320 included in the electrode assembly 300 are stacked with the same polarity to form an electrode tab arrangement, The end of the electrode tab stack and the electrode leads 400 and 410 may be bonded to each other. For example, an end of the electrode tab stack and the electrode leads 400 and 410 may be bonded to each other by welding or thermal fusion. In this case, an end of the electrode tab stack that is bonded to the electrode leads 400 and 410 may be an end of the protection members 315 and 325 .

In addition, the method for manufacturing a battery cell according to the present embodiment may further include a packaging step (S40) of mounting the electrode assembly electrically connected to the electrode lead to the receiving part of the battery case.

Accordingly, in the battery cell manufacturing method according to the present embodiment, each electrode plate ( 330 and 340), electron movement may be individually restricted for the electrode plate in which the short circuit has occurred. That is, it is possible to prevent an overcurrent phenomenon and a thermal runaway phenomenon with respect to the electrode plate in which the short circuit has occurred, thereby improving stability. In addition, the electrode plates 330 and 340 in which the short-circuit phenomenon does not occur may normally perform a battery function, thereby preventing a sudden shutdown of a device including the battery cell 100 .

A battery module according to another embodiment of the present invention includes the battery cells described above. Meanwhile, one or more battery modules according to the present embodiment may be packaged in a pack case to form a battery pack.

The above-described battery module and battery pack including the same may be applied to various devices. Such a device may be applied to transportation means such as an electric bicycle, an electric vehicle, and a hybrid vehicle, but the present invention is not limited thereto and is applicable to various devices that can use a battery module and a battery pack including the same, and this It belongs to the scope of the right of the invention.

Although the preferred embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also presented. It belongs to the scope of the right of the invention.

100: battery cell
200: battery case
300: electrode assembly
311, 315: protection member
400, 410: electrode leads
500: lead film

Claims (17)

an electrode assembly including a plurality of electrode plates stacked with a separator interposed therebetween; and
and a battery case in which the electrode assembly is mounted in a receiving part;
The electrode assembly includes a plurality of electrode tabs respectively extending from the plurality of electrode plates,
The plurality of electrode tabs are arranged on the same line with the same polarity to form an electrode tab arrangement,
A battery cell in which at least one protection member is bonded to the ends of the plurality of electrode tabs. In claim 1,
one of the at least one protective member is joined to some of the ends of the plurality of electrode tabs,
The battery cell in which the other one of the at least one protective member is bonded to the other part of the ends of the plurality of electrode tabs. In claim 1,
A battery cell in which the protection member is bonded to each end of the plurality of electrode tabs. In claim 1,
The protection member is a battery cell that is cut off when heat above the first temperature is applied. In claim 4,
The first temperature is a temperature of resistance heat generated when a current equal to or greater than a first current flows through the electrode plate. In claim 4,
The first current is a current of 10C or higher battery cell. In claim 1,
The protective member is a battery cell comprising a Pb-Sn (lead-tin) alloy. In claim 7,
The protective member is a battery cell made of an alloy containing 30% to 45% by weight of lead (Pb) and 55% to 70% by weight of tin (Sn). In claim 1,
The battery cell further comprising an electrode lead electrically connected to the electrode tab assembly and protruding outwardly of the battery case. In claim 9,
An end of the electrode tab arrangement is in contact with the electrode lead. In claim 10,
An end of the protection member is in contact with the electrode lead. In claim 9,
The battery case includes a sealing part having a structure in which the outer periphery is sealed by thermal fusion,
A battery cell comprising a lead film positioned at a portion corresponding to the sealing part in at least one of the upper part and the lower part of the electrode lead. In claim 12,
The electrode lead includes a first electrode lead part and a second electrode lead part,
The first electrode lead portion extends along an end of the electrode tab assembly,
The second electrode lead part protrudes from the first electrode lead part in an outer direction of the battery case. In claim 13,
The lead film is a battery cell located in the second electrode lead part. A pre-welding step of bonding the protective member to the electrode tab formed extending from the electrode plate;
an electrode assembly manufacturing step of manufacturing an electrode assembly by interposing a separator between the plurality of electrode plates to which the protection member is bonded; and
and a welding step in which the plurality of electrode tabs included in the electrode assembly are stacked with the same polarity to form an electrode tab arrangement, and an end of the electrode tab stack and an electrode lead are in contact with each other. In claim 15,
The method of manufacturing a battery cell further comprising a packaging step of mounting the electrode assembly electrically connected to the electrode lead in a receiving part of the battery case. A battery module comprising the battery cell according to claim 1 .

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