KR100897181B1 - Small Battery Pack Employed with External Input-output Terminal Positioned at Side or Bottom of Battery Cell - Google Patents

Abstract

The present invention uses a high-strength laminate sheet as a battery case in which the electrode assembly is embedded, makes the side sealing portion of the battery case itself into a specific shape, and by placing the external input / output terminals on the side or bottom of the battery cell, the side sealing portion itself Used as a structure for determining the external shape of the battery pack and used as a mounting space for external input / output terminals or protection circuits, the battery pack can be configured and assembly process is simpler, cheaper and thinner without using a separate pack exterior member. Provided is a battery pack that can be manufactured in a compact structure. In addition, the battery pack according to the present invention by positioning the external input and output terminals on the side or bottom of the battery cell, not only can be easily modified in structure according to the specifications of the device on which the battery pack is mounted, but also against external impact It is characterized by having safety.

Description

Small Battery Pack Employed with External Input-output Terminal Positioned at Side or Bottom of Battery Cell}

1 is an exploded perspective view of a typical pouch type battery;

FIG. 2 is a perspective view of a coupled state of the pouch-type battery of FIG. 1; FIG.

3 is a perspective view of a battery pack of the prior art in which a pouch-type battery is incorporated;

4 is an exploded perspective view of the battery pack of FIG. 3;

5 is a schematic diagram of a pouch-type battery according to one embodiment of the present invention;

FIG. 6 is a vertical sectional view of the A-A portion of FIG. 5; FIG.

7 is a schematic view of a battery cell according to an embodiment of the present invention;

8 is a perspective view of the battery cell of FIG. 7;

FIG. 9 is a schematic view of a vertical section of the B-B site in FIG. 7; FIG.

10 is a schematic diagram of battery cells according to another embodiment of the present invention;

FIG. 11 is a perspective view of the battery cell of FIG. 10.

The present invention relates to a slim compact battery pack including an external input and output terminal on the side or bottom of the battery cell. In more detail, the electrode assembly is sealed in a state in which the electrode assembly is built in the accommodating portion of the laminate sheet type battery case made of a high strength material including a resin layer and a metal layer, and the side sealing portion of the battery case forms a curved outer circumferential surface thereof. It is bent toward the side of the, provides an battery pack in which the external input and output terminals are located on the side or bottom of the battery cell. Such a battery pack may be manufactured in a more compact and thin structure by not using a separate pack exterior member such as a box-shaped case and a frame, and may be easily transformed into various structures according to the specifications of the device on which the battery pack is to be mounted. .

As the development and demand for mobile devices increases, the demand for secondary batteries as energy sources is increasing rapidly. Among them, many researches have been conducted and commercialized and widely used for lithium secondary batteries with high energy density and discharge voltage. It is used.

Lithium secondary batteries are largely classified into cylindrical batteries, square batteries, pouch-type batteries, and the like according to their appearance, and may be classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, and the like depending on the type of electrolyte.

Due to the recent trend toward the miniaturization of mobile devices, there is an increasing demand for thinner rectangular batteries and pouch-type batteries. In particular, for pouch-type batteries that are easy to deform, low in manufacturing cost and light in weight. Interest is high.

Generally, a pouch type battery refers to a battery in which an electrode assembly and an electrolyte are sealed inside a pouch type case of a laminate sheet including a resin layer and a metal layer. The electrode assembly accommodated in the battery case has a structure of jelly-roll type (winding type) or stack type (lamination type).

FIG. 1 schematically illustrates a structure of a pouch type secondary battery including a stacked electrode assembly, and FIG. 2 schematically illustrates a plan view of an assembled state of the battery of FIG. 1.

First, referring to FIG. 1, the pouch type secondary battery 10 includes an electrode assembly 30 including a positive electrode, a negative electrode, and a solid electrolyte coating separator disposed therebetween inside the pouch type battery case 20. Two electrode leads 40 and 41 electrically connected to the positive and negative electrode tabs 31 and 32 are sealed to be exposed to the outside.

The battery case 20 is composed of a case body 21 including a recess 23 having a concave shape in which the electrode assembly 30 can be seated, and a cover 22 integrally connected to the body 21. have.

The case body 21 and the cover 22 have an outer coating layer 20a made of ONy (stretched nylon film), a barrier layer 20b made of ordinary aluminum metal, and an inner sealant layer made of CPP (non-stretched polypropylene film) ( 20c), and a hot melt layer (not shown) is coated on the edge of the inner sealant layer 20c, such that the upper end portion 24 of the case body 20 and the upper end portion of the cover 22 are heat-sealed (not shown). By the heat and pressure from the air).

In the stack type electrode assembly 30, a plurality of positive electrode tabs 31 and a plurality of negative electrode tabs 32 are fused to each other and coupled to the electrode leads 40 and 41. In addition, when the upper end portion 24 of the case body 21 and the upper end portion of the cover 22 are heat-sealed by the heat sealer, the short circuit between the heat sealer and the electrode leads 40 and 41 is prevented from occurring. In order to secure the sealing property between the 40 and 41 and the battery case 20, the insulating film 50 is attached to the upper and lower surfaces of the electrode leads 40 and 41.

When the electrode assembly 30 in which the electrolyte is impregnated is thermally fused to the contact portion of the case body 21 and the cover 22 in a state in which the electrode assembly 30 is seated on the accommodating portion 23, the upper sealing portion 25 and the side surface as shown in FIG. The sealing part 26 is formed. Since the side sealing part 26 unnecessarily extends in both directions, it is bent vertically for manufacture of a battery pack.

The pouch battery 10 has a case body 21 and a cover 22 having an outer coating layer 20a made of ONy (stretched nylon film), a barrier layer 20b made of ordinary aluminum metal, and a CPP (non-stretched polypropylene film). Since the inner sealant layer 20c is made of a structure of the inner sealant layer 20c, the case body 21 and the cover 22 are easily damaged and ignited or exploded when pressed by a physical shock or a pointed object. have.

Therefore, in general, the battery pack is constructed by embedding the battery cell 10 'formed by bending the side sealing part 26 vertically in a case (not shown) having a predetermined mechanical rigidity.

3 and 4 show a representative structure of such a battery pack and a state diagram of separation before assembly, respectively.

Referring to these drawings, the battery pack 60 may contain a battery cell 10 'and a battery cell 10' in which the electrode assembly of the positive electrode, the negative electrode, and the separator and the electrolyte are sealed. A pack case body 70 having a space and an upper cover 80 coupled to the pack case body 70 in which the battery cells 10 'are housed and sealing the battery cells 10' are sealed. The double-sided tape 80 is attached between the pack case body 70 and the battery cell 10 'and between the upper cover 72 and the battery cell 10', respectively.

In general, the battery pack 60 of such a structure is assembled by mutually coupling the pack case body 70 and the upper cover 72, each of which is made of a plastic material such as PC and ABS, by ultrasonic welding. The ultrasonic welding method is, for example, a method in which friction heat is generated by vibration using a high frequency of 20,000 Hz to melt-bond two surfaces to be bonded.

However, as the demand for thinner battery packs increases, the thickness of the pack case main body 70 and the upper cover 72 has been thinned to 0.3 to 0.35 mm, respectively. The difficulty of welding is high and the welding failure rate is increasing.

In addition, in the case of a battery using a metal can as a case (so-called square battery), a thin case may provide an appropriate strength against external impact due to the characteristics of the metal can. Pouch-type battery 10 is structurally small in strength against external impact, there is a limit to the application of a thin pack case.

Furthermore, the external input / output terminals should be located in the same direction as the electrode terminals of the battery cell, and the protection circuit unit 90 is mounted on the top of the battery cell. Since the mounting structure or method of the battery is uniform, the device to which the battery pack will be mounted Could not change the structure of the various.

Therefore, it is easy to manufacture, the structure can be modified according to the specifications of the device on which the battery pack is to be mounted, there is a high need for a more compact and thin battery pack.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

Specifically, an object of the present invention is to provide a battery pack that can be easily modified in structure according to the specifications of the device on which the battery pack is to be mounted.

Another object of the present invention is to provide a battery pack having a very thin and compact structure by having a predetermined strength without using a conventional pack exterior member such as a box-shaped case, a frame or the like.

Still another object of the present invention is to provide a battery pack capable of reducing the manufacturing cost by simplifying the assembly process.

The battery pack according to the present invention for achieving the above object is a battery pack consisting of a battery containing an electrode assembly in a sheet-shaped battery case containing a resin layer and a metal layer, the battery case is made of a high-strength material, The side sealing part is formed to surround the side part of the battery case while forming a curved outer circumferential surface, and the external input / output terminal is configured to be located at the side sealing part or the lower end of the battery cell.

Therefore, the battery pack according to the present invention forms a battery pack without using a separate pack exterior member, thereby making the assembly process simple and inexpensive, while making a thinner and more compact structure, the structure of the battery pack is modified according to the specifications of the device to be mounted. Not only can it be easily manufactured, it is characterized by having safety against external shocks. This feature is achieved by using a high strength laminate sheet as a battery case in which the electrode assembly is incorporated, making the side sealing portion of the battery case itself into a specific shape, and placing external input / output terminals at the side sealing portion or the bottom of the battery cell. Can be.

According to the present invention, since an external input / output terminal is separated from an electrode terminal (battery cell electrode terminal) positioned at the top of the battery cell and is located at the bottom or side of the battery pack, a connection member is provided for electrical connection with the electrode terminal of the top of the battery cell. The connection member is extended to the lower end of the battery cell through the inner space formed by its end portion is gently bent in the battery cell direction while the side sealing portion forms a curved outer peripheral surface. The connection member is not particularly limited as long as it is for electrical connection. For example, the connection member may be a bus bar of a nickel plate that is bent into an outer shape of the battery cell.

When the external input / output terminals are located on the curved outer circumferential surface of the battery cell side part, the protection circuit part may be mounted in any one of the inner spaces of both side sealing parts of the battery cell. It may be mounted in the sealing space.

In one preferred example, when the external input / output terminal is located on the curved outer circumferential surface of the battery cell side, the protection circuit portion is located in the inner space of the curved outer circumferential surface of the corresponding side portion. Accordingly, the side sealing part may also be used as a mounting space of the external input / output terminal and the protection circuit part, respectively, to manufacture a battery pack having a more compact structure.

At this time, the external input and output terminals can be more stably positioned on the curved outer peripheral surface of the side of the battery cell, and preferably serves to support the end of the external input and output terminals and the bus bar to be stably located in the battery cell. A member (“support member”) may further be included. Accordingly, the external input / output terminals may be coupled to one surface of the support member, and a bus bar may be coupled to the opposite surface.

Since the supporting member is mounted in the inner space of the side sealing part having the curved surface, the length of the terminal is spaced between the supporting member and the curved inner surface of the side sealing part to expose the external input / output terminals coupled to the supporting member to the outside. Although it should be longer than the distance, in this case there is a possibility of internal short-circuit when the battery pack falls, it is difficult to secure the external input and output terminals to the battery case, and when the external shock is applied to the battery cell, the support member is a side sealing portion There is a risk of moving in the inner space or bending of the external input / output terminals.

Therefore, preferably, the supporting member may be filled with an insulating resin or an insulating cover may be formed to closely contact the cross-sectional shape corresponding to the inner space of the curved side sealing part. In this case, the support member may be mounted in a state in which the support member is stably held in the inner space of the side sealing part, and the external input / output terminals may be stably exposed to the outside of the battery case.

In addition, in one preferred embodiment, the external input and output terminals may be located on the side of the battery cell, the protective circuit portion may be a structure located in the inner space of the curved outer peripheral surface of the side of the battery cell. In this case, the protection circuit unit may be coupled to the external input / output terminals, and may be stably fixed without using a separate member in the inner space of the side sealing part. Here, the side sealing portion may be formed to be in close contact with the curved outer circumferential surface without forming an edge along the outer surface of the protective circuit portion in order to prevent the movement of the protective circuit portion in the side sealing portion. For example, when the protective circuit portion has a rectangular shape on a vertical cross section, the side sealing portion may also have a rectangular shape corresponding thereto and bent to form an arc having a small corner.

In some cases, an adhesive, a double-sided adhesive tape, an insertion member, or the like may be additionally used to the part to stably fix the protective circuit part in the inner space of the side sealing part. Electrical connection between the protection circuit unit mounted on the inner space of the side sealing part and the electrode terminals on the top of the battery cell may also be achieved by a connection member such as a bus bar.

Since the upper end of the battery cell does not have a separate function except that the electrode terminal is connected to the connection member, it is preferable to reduce the height to reduce the overall size of the battery cell if possible. Therefore, the upper sealing part may be vertically bent upward to closely contact the main body of the battery cell, and the electrode terminal may be vertically bent downward to connect the electrode terminal to the connection member in close contact with the upper sealing part. In order to ensure insulation, an insulating sheet may be interposed between the bent top sealing portion and the electrode terminal.

In addition, when the external input and output terminal is located at the bottom of the battery cell, in order to assist in mounting the external input and output terminal for the battery cell and protect it from the outside, the external input and output terminal is coupled with a separate insulating cap (lower cap) It may be coupled to the bottom of the battery cell in the state. In one preferred example, the bottom cap includes a bottom extension of the cross-sectional shape corresponding to the inner space of the bent side sealing portion. Therefore, fastening of the lower cap to the battery cell can be easily achieved by inserting the lower extension into the inner space of the side sealing portion.

In one preferred example, the external input / output terminal and the bottom cap may be integrally formed by insert injection molding, and the detailed description thereof relates to the applicant's PCT International patent application for insert injection molding of the protective circuit portion and the top cap. It can be easily applied based on the contents disclosed in PCT / KR2004 / 2882. Accordingly, this application is incorporated by reference in the context of the present invention.

Also, when the external input / output terminal is located at the side of the battery cell, and the protective circuit part is located at the top or bottom of the battery cell, for example, an electrically insulating top cap and / or bottom cap may be placed at the top and / or bottom of the battery cell. Can be mounted on the bottom. In this case, the top cap or the bottom cap may similarly include the bottom extension.

In one preferred example, the outer surface of the battery cell may be coated with an outer film in a state in which the protection circuit unit is mounted on the lower end of the battery cell and the top cap and the lower cap are mounted on the upper and lower ends, respectively. The outer film is attached in a form surrounding the outer surface of the battery cell, and prevents foreign matter from flowing between the end of the side sealing part and the battery case, and serves to put a coupling force between the top cap and the lower cap and the battery cell. The outer surface of the exterior film may show the product label, the manufacturer label, how to use the product, and precautions.

A preferable example of the battery case is a laminate sheet composed of an outer coating layer of a polymer film, a barrier layer of a metal foil, and a polyolefin-based inner sealant layer, wherein the outer coating layer is made of polyethylene naphthalate (PEN) and / or the outer A polyethylene terephthalate (PET) layer is provided on the outer surface of the coating layer, and the battery case of such a structure exhibits excellent strength so that it can provide mechanical properties required for the battery pack by itself without using a separate pack exterior member. Can be. That is, the PET outermost layer and the PEN outer coating layer provide excellent tensile strength, impact strength and durability to the battery case.

The polymer film of the outer coating layer, the polymer film of the outer coating layer may be selectively composed of PEN, when not composed of PEN, preferably may be composed of a stretched nylon film. Such stretched nylon film can be, for example, ONy15 or ONy25, where ONy represents the stretched nylon film and the numerical value represents the thickness in μm.

The metal foil of the barrier layer is preferably aluminum foil. The aluminum foil may be particularly preferably used, for example, selected from the group consisting of Al 20-150 (8079, 1N30, 8021, 3004), wherein the numerical value represents thickness (μm) and is in parentheses. The numerical value represents the alloy number (No).

The inner sealant layer preferably consists of an unstretched polypropylene film. Such an unstretched polypropylene film can be selected, for example, from the group consisting of CPP 30-150, where CPP represents an unstretched polypropylene film and the numerical value represents a thickness in μm.

Since the battery case of the above structure exhibits very good strength, it provides mechanical properties required for the battery pack itself, that is, excellent tensile strength, impact strength, and durability without using a separate pack exterior member.

The battery case may be manufactured in various ways. For example, films, metal foils, and the like constituting the respective layers may be sequentially laminated and then bonded to each other, and dry lamination or extrusion lamination methods may be used as such a bonding method. Can be. The dry lamination method is a method in which the two materials are bonded to each other by a temperature and pressure higher than room temperature using a heating roll after drying by interposing an adhesive between one material and the other material. In addition, the extrusion lamination method is a method of interposing the two materials by a constant pressure at room temperature using a pressing roll after the adhesive is interposed between the one material and the other material.

Since the high-strength laminate sheet exhibits significantly superior mechanical strength than the conventional laminate sheet, when the sheet is deformed to a specific form by applying a predetermined mechanical force, the deformed state can be maintained even if a force below the mechanical force is applied.

Therefore, in the present invention, by forming a curved outer circumferential surface by modifying both side sealing parts which were useless parts in the conventional pouch-type battery, it was configured to play a useful role as such.

Since the side sealing portion formed by heat-sealing two laminate sheets (case body and cover) forms a thin plate-like structure, the end portion of the sealing portion is relatively sharp. As shown in FIGS. 3 and 4, in the conventional battery pack, the side sealing part is vertically folded and positioned inside the pack exterior member (case, etc.). On the other hand, in the present invention, the side sealing portion forms a part of the exterior of the battery pack without using a separate pack exterior member when the battery pack is configured. Therefore, since the side sealing portion is processed to form the curved outer circumferential surface so that the end portion of the sealing portion faces inward, it is deformed to surround the outer surface of the battery case of the electrode assembly accommodating portion. Furthermore, since the side sealing portion deformed to form a curved outer circumferential surface forms a gentle outer surface (side surface), it is easy to attach when applying the exterior film to the outer surface, and a battery pack having a gentle side surface is easy to mount on the device. It has advantages such as points.

The curved outer circumferential surface refers to a structure in which an end portion of the side sealing portion is bent toward the electrode assembly accommodating portion direction, that is, inward, to form a smooth curved or non-angled corner. Accordingly, the curved outer circumferential surface may have various structures, and preferably, may have a structure having a radius of curvature R in cross section. The end portion of the side sealing portion that is gently bent inward may directly contact the outer surface of the battery case of the electrode assembly accommodating portion, but may be slightly spaced therefrom.

The radius of curvature can be freely set, but if the radius of curvature is too large, the corners of the battery case are almost perpendicular to each other, which may cause gaps between the electrode assemblies. Since the height of the battery case is less than the sealing portion, it may not be easy to attach the case when the exterior film is applied to the outer surface. Accordingly, the radius of curvature preferably corresponds to a size of 40 to 60% of the height of the battery case, and the end of the side sealing portion that is gently bent inwardly at the radius of curvature may directly contact the outer surface of the battery case of the electrode assembly accommodating portion. It may, but may be slightly spaced from it.

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

5 is a schematic diagram of a pouch-type battery 100 according to an embodiment of the present invention. Since the pouch-type battery of FIG. 5 is substantially the same as the conventional pouch-type battery 10 described with reference to FIGS. 1 and 2, descriptions of other matters except for the features of the present invention will be omitted.

When the top and both sides are heat-sealed in a state in which the electrode assembly is embedded, the sealing parts 110, 120, and 130 are respectively formed on the top and both sides of the pouch-type battery 100. In the present invention, the ends of both side sealing portions 120 and 130 are gently bent in the direction of the electrode assembly accommodating portion 140. Figure 6 shows a cross-sectional view of such a bent A-A site.

Referring to FIG. 6, the battery case has two types of stacked structures. The first type (B) is the outer covering layer 100a made of ONy, the barrier layer 100b made of aluminum alloy, and the inner sealant layer 100c made of CPP, and the outermost PET layer 100d on the outer surface of the outer cover layer 100a. ) Is covered with a structure. The second type (C) has a structure of an outer coating layer 100e made of PEN, a barrier layer 100b made of aluminum alloy, and an inner sealant layer 100c made of CPP. At the time of thermal fusion, the inner sealant layers 100c of the case body and the cover are fused to each other to form a sealing portion.

The side sealing parts 120 and 130 form an outer circumferential surface in the form of an arc in a vertical cross section, and the ends 121 and 131 thereof are bent in the direction of the accommodating part 140 in which the electrode assembly 150 is embedded. Thus, the sharp ends 121, 131 are not facing outwards, and thus do not affect the operator or the user during handling.

Referring back to FIG. 5, as described later with reference to FIGS. 11 to 15, the upper sealing part 110 is bent vertically to reduce the height of the battery cell 100. A predetermined amount is cut out of the intersection portion 170 where the portion 110 and the side sealing portions 120 and 130 meet. The cut size of the intersection 170 may be determined within a range that does not impair the sealability of the electrode assembly.

Before or after the side sealing portions 120 and 130 are bent as shown by the arrows, the upper sealing portion 110 is bent vertically along the dashed dashed line 111.

According to the present invention, since both side sealing portions 120 and 130 are bent, for example, as shown in FIG. 6, the width w of the side sealing portions 120 and 130 is larger than that of the conventional pouch type battery. It may be desirable.

7 is a partial front view of the battery pack according to an embodiment of the present invention, and FIG. 8 is a perspective view of the battery pack of FIG. 7.

Referring to these drawings, the upper sealing part 110 is bent vertically upward and the electrode leads 160 and 162 are bent vertically downward to be in close contact with the top of the battery cell 100. In addition, the side sealing parts 120 and 130 are bent inward to form a curved outer circumferential surface thereof to form an inner space, and the inner space of the one side sealing part 130 corresponds to an inner space of the curved side sealing part. Support member 220 having a cross-sectional shape to be mounted. The bus bar 310 is coupled to one surface of the support member 220, and the external input / output terminals 302 and 312 are coupled to the opposite side (the opposite surface).

On the curved outer circumferential surface 130 of the battery case, an opening through which the external input / output terminals 302 and 312 may protrude is drilled, and the external input / output terminals 302 and 312 are exposed to the outside through the opening.

The protection circuit unit 400 is installed in the inner space formed by bending the corresponding side sealing unit 120 of the side sealing unit 130 on which the external input / output terminals 302 and 312 are formed. The front terminals 160, 162, the support member 220, and the protection circuit unit 400 are electrically connected to each other by the bus bars 300 and 310 which are bent in a shape substantially coincident with the outer surface of the battery cell 101. It is connected.

The bus bars 300 and 310 are coupled to the positive lead 160 and the negative lead 162 in the state of being located in the inner space of the side sealing parts 120 and 130. Coupling of the electrode leads 160, 162 with the bus bars 300, 310 may be accomplished by spot welding, for example.

FIG. 9 is an enlarged cross-sectional view of the portion B-B of FIG. 7.

Referring to FIG. 9, the ends 121 and 131 have a PCB shape in an inner space of the side sealing part 120 that is gently bent in the direction of the accommodating part 140 of the battery case in which the electrode assembly 150 is built. Protective circuit unit 400 is provided, and external input / output terminals 302 and 312 are provided on the curved outer circumferential surface formed outside of the opposite side sealing unit 130, and external input / output terminals 302 and 312 in the inner space thereof. Is connected to the support member 220.

Since the vertical cross-sectional shape of the support member 220 substantially coincides with the vertical cross-sectional shape of the side sealing part 120, the support member 220 stably forms the inner surface of the side sealing part 120 while forming a smooth outer surface. It will be fixed. The external input / output terminals 302 and 312 protrude through openings formed on the curved outer circumferential surface of the battery case.

The coupling of the external input / output terminals 302 and 312 and the supporting member 220 and the coupling of the supporting member 220, the protection circuit unit 400, and the bus bar 300 may be achieved by various methods. Spot welding, laser welding, soldering, etc. can be performed.

10 is a front schematic view of a battery pack according to another embodiment of the present invention, Figure 11 is a perspective view of the battery pack according to it.

Referring to these drawings, the battery cell 100 is the upper sealing portion 110 of the battery cell 100 is vertically bent upwardly and the electrode leads 160, 162 are vertically bent downwardly so that the battery cell 100 It consists of a structure that is in close contact with the top. In addition, the protection circuit unit 400 of the PCB form is installed in the inner space formed on the side sealing portion 120. External input / output terminals 302 and 312 are connected to one side of the protection circuit unit 400, and bus bars 300 and 310 are connected to the opposite side thereof. The external input / output terminals 302 and 312 protrude outward through an opening formed on the curved outer circumferential surface 130 of the battery case.

In particular, the vertical cross-sectional shape of the side sealing part 120 is substantially coincident with the rectangular vertical cross-sectional shape of the protection circuit part 400 and is bent so that the corner portion is not angled.

Although the embodiments of the present invention have been described above with reference to the drawings, those skilled in the art will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

As described above, the battery pack according to the present invention uses a high-strength laminate sheet as a battery case in which the electrode assembly is embedded, makes the side sealing portion of the battery case itself into a specific shape, and external input / output terminals are sealed to the side of the battery cell. Located at the bottom or bottom, the side sealing part itself is used as a structure to determine the external shape of the battery pack, and at the same time utilized as a mounting space for the external input and output terminals and the protection circuit, the battery pack without using a separate pack outer member It can be configured and the assembly process is simple and cheap and can be manufactured in a thinner and more compact structure. In addition, according to the specifications of the device on which the battery pack is mounted is characterized in that the deformation of the structure can be easily manufactured.

Such battery packs may be more preferably used in compact sling battery packs, which have recently increased in demand.

Claims (13)

A battery pack comprising a battery containing an electrode assembly in a sheet-shaped battery case including a resin layer and a metal layer, wherein the battery case includes an outer coating layer including a polymer film, a barrier layer containing a metal foil, and a polyolefin-based inner sealant layer. It is made of a high-strength material that is configured, the side sealing portion of the battery case is formed to surround the side of the battery case while forming a curved outer circumferential surface, the external input and output terminals to be located on the side sealing portion of the battery cell or the bottom of the battery cell A battery pack characterized by the above. The battery pack as claimed in claim 1, further comprising a connection member for electrically connecting the external input / output terminal and the electrode terminal on the upper end of the battery cell. The battery pack as claimed in claim 2, wherein the connection member is a bus bar of a nickel plate that is bent into an outer surface shape of the battery cell. The battery pack as claimed in claim 1, wherein the external input / output terminals are positioned on the curved outer circumferential surface of the battery cell side portion, and the protection circuit portion is located in the inner space of the curved outer circumferential surface portion of the corresponding side portion. The battery pack according to claim 1, further comprising a support member for supporting the external input / output terminals so that the external input / output terminals can be stably positioned on the curved outer circumferential surface of the battery cell side part. The battery pack as claimed in claim 5, wherein the support member is formed to match a cross-sectional shape corresponding to an inner space of the curved side sealing part. The battery pack as claimed in claim 1, wherein the external input / output terminals are positioned on the curved outer circumferential surface of the battery cell side part, and the protection circuit part is located in the inner space of the curved outer circumferential surface side part of the battery cell. delete The battery pack according to claim 1, wherein the outer coating layer is made of polyethylene naphthalate (PEN) and / or a polyethylene terephthalate (PET) layer is provided on the outer surface of the outer coating layer. The battery pack according to claim 1, wherein the polymer film of the outer coating layer is made of PEN or, if not, made of stretched nylon film. The method of claim 1, The polymer film of the outer coating layer is ONy15 or ONy25; The metal foil of the barrier layer is selected from the group consisting of Al 20-150 (8079, 1N30, 8021, 3004); The inner sealant layer is any one of CPP 30-150; Battery pack characterized in that. The battery pack according to claim 1, wherein the curved outer circumferential surface has a radius of curvature R in cross section. 13. The battery pack as claimed in claim 12, wherein the radius of curvature corresponds to a size of 40 to 60% of the height of the battery case.

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