KR101384919B1 - Secondary battery - Google Patents

Abstract

The present invention relates to a secondary battery, and to provide a secondary battery that facilitates the elimination of defects through separation and reassembly in the event of a defective battery, and also facilitates repair in the event of an abnormal use of the battery.

To this end, a secondary battery according to the present invention includes a pouch-type bare cell formed by exposing an electrode tab to one side, a protective circuit board connected to an electrode tab of a pouch-type bare cell, and an accommodation space of the pouch-type bare cell and a protective circuit board. And an outer cover forming an outer case, an outer cover surrounding the upper and side portions of the pouch-type bare cell, and a fastening portion coupling the outer case and the outer cover.

Secondary battery, pouch type bare cell, fastener, outer case, protrusion fastener

Description

Secondary battery

The present invention relates to a secondary battery, and more particularly, to an internal pack secondary battery including a pouch-type bare cell.

Unlike a primary battery, which can not be charged, a secondary battery is a battery capable of charging and discharging, and is widely used in the fields of small-sized high-end electronic devices such as mobile phones, PDAs, and notebook computers. Particularly, the lithium secondary battery has a working voltage of 3.6 V, which is three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and is rapidly growing in terms of high energy density per unit weight.

In addition, such a secondary battery may be classified into an internal battery and an external battery based on a mounting method for an electronic device, and the internal battery is commonly referred to as an inner pack. Therefore, in the following description, the term inner pack will be used for an internal battery.

The external battery itself forms part of the external shape of the electronic device, that is, the external battery is mounted in such a state that one side of the external battery is exposed to the electronic device. Accordingly, the external battery can be mounted and detached through a relatively easy operation on the electronic device, but the external shape of the external battery must be made in harmony with the form of the electronic device, so that various types of electronic devices must be made separately. Therefore, the external battery is less compatible, resulting in an increase in the production cost due to the design of several designs.

For this reason, in recent years, as the use of the inner pack is increasing, the inner pack is mounted in the interior of the electronic device, and the electronic device in which the inner pack is mounted has a separate cover for covering the mounted inner pack from the outside do. Therefore, while the inner pack has a relatively cumbersome difficulty in mounting an electronic device, the inner pack is compatible and applied to various types of electronic devices, and is not only designed in a simple form due to this feature, but also advantageous for mass production. Rather, it has the advantage of reducing production costs.

A brief description will be made of the configuration of the inner pack and its manufacturing process. The inner pack is manufactured by insert injection molding a protective circuit board electrically connected to a pouch-type bare cell together with the pouch-type bare cell.

Briefly describing the process of manufacturing the inner pack by insert-inserting the pouch-type bare cell and the protective circuit module, the molding space of the mold consisting of the upper mold and the lower mold of the core pack combined with the pouch-type bare cell and the protective circuit board Place it inside. Then, the molding resin is injected into the molding space of the upper and lower molds, and the molding resin is solidified so that the molding resin is molded into the space between the pouch-type bare cell and the protective circuit board and the outer periphery of the pouch-type bare cell and the protective circuit board. Formation of the inner pack is made.

However, the manufacture of the inner pack by insert injection molding as described above involves a lot of difficulties.

For example, after the core pack is mounted in the molding space of the mold, physical pressure is applied to the pouch-type bare cell in the process of integrally combining the upper mold and the lower mold, so that the core pack may be deformed. In addition, since the high temperature and high pressure molding resin is injected into the molding space of the mold, there is a high possibility that the defect of the inner pack produced by twisting the coupling position of the pouch-type bare cell and the protective circuit board is caused by the pressure of the injected molding resin.

In addition, a change in battery characteristics of the pouch type bare cell may occur due to the molding resin having a high temperature in the mold, and there is also a risk of explosion. In addition, when pressure is applied to the pouch forming the outline of the pouch-type bare cell in the mold, a phenomenon may occur in which the heat-adhesive portion of the pouch is partially separated.

In addition, there is a problem that the dimensional accuracy of the pouch-type bare cell or the upper and lower molds is more required in order to mount the pouch-type bare cell in a stable state. In addition, it is very cumbersome or difficult to separate the molded part of the molded resin solidified once from the core pack, so that it is not easy to reassemble or repair the battery when the abnormality occurs in the process of using the battery.

The present invention is to solve the above problems, the casing (casing) of the core pack including a pouch-type bare cell is made through the assembly process of a plurality of pre-fabricated components, physical to the core pack in the casing process of the battery Phosphorus pressure and high temperature heat are not applied, and as a result, no deformation or characteristic change of the pouch-type bare cell itself occurs, and an abnormality in the physical connection and electrical connection state between the pouch-type bare cell and the protective circuit board is prevented. It is an object of the present invention to provide a secondary battery that can minimize the occurrence of the phenomenon.

In addition, the present invention does not require molding by molding resin in the casing of the core pack including the pouch-type bare cell, and is made by a mechanical assembly method of various prefabricated components. It is an object of the present invention to provide a secondary battery that can be easily solved through separation and reassembly when a defective battery is generated, and also easy to repair when an abnormality occurs in the process of using the battery.

In order to achieve the above object, the present invention, a pouch-type bare cell formed by exposing the electrode tab to one side, a protective circuit board connected to the electrode tab of the pouch-type bare cell, and accommodates the protective circuit board, It provides a secondary battery including an outer case surrounding the lower portion and the side of the pouch-type bare cell, an outer cover surrounding the upper portion and the side of the pouch-type bare cell, and a fastening portion for coupling the outer case and the outer cover.

The outer case may have a bottom surface and four surfaces extending from four ends of the bottom surface, and may form a receiving space of the pouch-type bare cell and the protective circuit board inside the bottom surface and the four surfaces. have.

A plurality of fastening grooves may be formed on opposite sides of the outer case.

One of four surfaces of the outer case may have a terminal hole through which the external connection terminal of the protective circuit board is exposed.

The outer cover may include a main cover part having a size corresponding to the open side of the outer case, and a skirt part bent from both ends of the main cover part and disposed to face two side surfaces of the outer case.

The outer case may have a first step for mounting the main cover part of the outer cover on the other surface facing the surface where the terminal hole is formed, and the height of the first step may be equal to the thickness of the main cover part. .

The outer case is connected to a surface on which the first step is formed and the other two side surfaces form a second step, and the height of the second step may be equal to the thickness of the skirt of the outer cover.

A plurality of protruding fasteners may be formed on the inner surface of the skirt portion.

The protruding fasteners may have protrusions formed on the inner surfaces of the two skirt portions through lancing.

The fastening portion may combine two skirt portions of the outer cover and two side surfaces of the outer case facing the skirt portion.

The fastening part may include a plurality of protruding fasteners formed on inner surfaces of two skirt parts of an outer cover, and the fastening grooves formed on two sides of an outer case facing the skirt part.

The size of the fastening groove may correspond to the size of the protruding fastener.

A taping member may be further included to surround the coupling portion of the fastening part.

The taping member may be formed in a single sheet form, and may cover the entire outer surface of the outer cover and the whole or part of the bottom surface of the outer case, including the engaging portion formed by the protrusion-type fastener and the locking groove.

The taping member may be a label.

In addition, the secondary battery may further include a substrate case coupled to one surface of one side of the protective circuit board and the other side of the secondary battery coupled to one surface of the electrode tab of the pouch-type bare cell.

An elastic locker is installed in the substrate case, and the elastic locker may be elastically coupled to a locking hole formed on an inner surface of the outer case.

As can be seen through the above-described embodiments, by the pouch type secondary battery according to the present invention, in the casing of the core pack including the pouch type bare cell, physical pressure or high temperature heat is applied to the core pack. As a result, deformation or characteristic change of the pouch-type bare cell itself does not occur, and an abnormality in physical coupling and electrical connection between the pouch-type bare cell and the protective circuit board may be minimized. .

In addition, the casing of core packs including pouched bare cells does not require molding by molding resin, and the casing of such core packs is achieved by mechanical assembly of various prefabricated components. Therefore, when the failure of the finished battery is generated, it is easy to solve the defect through separation and reassembly, and when the abnormality occurs in the process of using the battery, it can be easily repaired.

1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention. As shown in FIG. 1, in the secondary battery 100, the core pack 110 is accommodated in an accommodating space inside the outer case 120, and the outer cover 130 is seated thereon. In addition, the secondary battery 100 has a plurality of fastening fasteners 133 formed on the skirt 132 of the outer cover 130 formed on both side surfaces 124 of the outer case 120. Insertion and coupling to the groove 127 to form a fastening portion so that the fastening of the outer cover 130 and the outer case 120 can be made more robust. In addition, the secondary battery 100 may be used to reinforce the coupling state of the upper case 120 and the outer cover 130, the taping member 140, in the case of the embodiment shown in FIG. 140 is a single sheet configuration covering the entire outer surface of the outer cover 130 and a portion of the outer surface of the outer case 120, and the tape member 140 having a single sheet configuration as described above is taken as an example.

Figure 2a is a perspective view showing a state in which the core pack is accommodated inside the outer case. The protection circuit board 113 of the core pack 110 is accommodated in the substrate receiving space inside the auxiliary cover 125 of the outer case 120 and in the locking hole 126 formed in the auxiliary cover 125. The elastic locker 115 formed on the substrate case 114 of the core pack 110 is elastically coupled to allow the core pack 110 to be more stably received in the outer case.

The core pack 110 generally refers to a battery type in which a pouch-type bare cell 111 and a protection circuit board 113 are combined, and the term core pack 110 will be used in the following description.

The protection circuit board 113 forms a protection circuit for the pouch-type bare cell 111, and the protection circuit board 113 is physically coupled to the electrode tab of the pouch-type bare cell 111. At the same time, it is electrically connected to the electrode tab of the pouch-type bare cell 111. One side of one side of the pouch-type bare cell 111 is coupled between one side of the protective circuit board 113 and one side of the pouch-type bare cell 111 between the protective circuit board 113 and the pouch-type bare cell 111. The substrate case 114 to which the other side is coupled may be further installed.

The substrate case 114 has a function of further strengthening the coupling between the protective circuit board 113 and the pouch-type bare cell 111. The substrate case 114 includes electrode tabs of the pouch-type bare cell 111 to cover and protect various connection mechanisms of the pouch-type bare cell 111 and the protection circuit board 113. Since the substrate case 114 is coupled to the pouch-type bare cell 111 in a state of protecting and supporting a connection mechanism between the protective circuit board 113 and the pouch-type bare cell 111, the protective circuit board is provided. Mechanical fastening and electrical connection between the 113 and the pouch-type bare cell 111 may be more stable. The substrate case 114 may be manufactured by injection molding an insulating molding resin, but the substrate case 114 of the present invention is not limited thereto. The substrate case 114 may be coupled to the pouch-type bare cell 111 and the protective circuit board 113 by a double-sided tape or an insulating adhesive, but the present invention is not limited thereto.

A plurality of elastic lockers 115 may be installed in the substrate case 114, and the core pack 110 may be fastened to the locking hole 126 formed on the inner surface of the outer case. It can be accommodated in a more stable state inside the outer case.

In addition, a plurality of external connection terminals 116 are formed on the front surface of the protection circuit board 113 to allow electrical connection to an external set (not shown).

The pouch-type bare cell 111 is capable of charging and discharging. Such a pouch-type bare cell 111 may be largely divided into an electrode assembly and a pouch, and the appearance of the pouch-type bare cell 111 may be narrow and continuous. It has a cuboid or similar structure having four sides of width and two sides of relatively wide width. Since the pouch-type bare cell 111 corresponds to a configuration of a pouch-type bare cell commonly used in the field of secondary batteries, detailed illustration and description thereof will be omitted and briefly described.

As described above, the pouch-type bare cell 111 is largely divided into an electrode assembly and a pouch, and the electrode assembly is accommodated inside the pouch. The electrode assembly is made of a jelly roll type in which the positive electrode plate and the negative electrode plate are wound in one direction with a separator interposed therebetween. Here, the positive electrode plate includes a positive electrode current collector made of a metal thin plate having excellent conductivity, for example, aluminum (Al) foil, and a positive electrode active material layer coated on both surfaces of the positive electrode current collector. At both ends of the positive electrode current collector, a region where the positive electrode active material layer is not formed, that is, the positive electrode non-coating portion is formed. In addition, the negative electrode plate includes a negative electrode current collector made of a conductive metal thin plate, for example, copper (Cu) or nickel (Ni) foil, and a negative electrode active material layer coated on both surfaces of the negative electrode current collector. Then, both ends of the negative electrode current collector are provided with regions where the negative electrode active material layer is not formed, that is, the negative electrode non-coating portion. In addition, the electrode tabs are attached to the positive electrode non-coating portion of the positive electrode plate and the negative electrode non-coating portion of the negative electrode plate, respectively, where the electrode tabs may be a pair of configurations attached to each of the positive electrode non-coating portion and the negative electrode non-coating portion, and the discharge capacity of the secondary battery. It may be composed of a pair or more in consideration of such. Then, such an electrode assembly is accommodated inside the pouch, where the pouch is sealed while exposing a portion of the electrode tab of the electrode assembly to the outside. Such pouches are usually composed of upper and lower pouch layers, wherein the upper and lower pouch layers may be formed of a three-layer structure of a polyolefin-based resin layer, an aluminum layer, an aluminum layer, and a nylon layer. have. That is, the polyolefin resin layer has a heat adhesiveness and serves as a sealing material, and the aluminum layer serves as a substrate for maintaining the mechanical strength of the pouch and a barrier layer of water and oxygen, and the nylon layer serves as a substrate and a protective layer. do. In addition, CPP (Casted Polypropyne) is commonly used as the polyolefin resin layer.

A double sided tape 112 may be attached to an upper surface of the pouch-type bare cell 111, and the core pack 110 and an outer cover to be described later may be coupled to each other by an adhesive force of the double sided tape 112. The double-sided tape 112 may be any type as long as it can be coupled to the core pack 110 and the outer cover, and the present invention is not limited to the double-sided tape 112.

The outer case 120 is to form a receiving space of the core pack on the inside, the outer case 120 is a bottom surface 121 and the bottom surface (which one side of the two wide sides of the pouch-type bare cell abuts ( 121 is formed in four faces extending from the four ends. That is, the outer case 120 includes a bottom surface 121, an auxiliary cover 125, a rear surface 123, and both side surfaces 124 facing each other. The bottom surface 121, the auxiliary cover 125, the rear surface 123, and both side surfaces 124 facing each other form a receiving space of the core pack therein, and the side opposite to the bottom surface 121. Is an open form. A plurality of locking holes 126 may be formed at an upper portion of the auxiliary cover 125, and the core pack 110 may be connected to the outer case through fastening with the plurality of elastic lockers 115 installed in the substrate case 114. The inside of the 120 can be accommodated in a more stable state. That is, when the auxiliary cover 125 is formed on one of four surfaces of the outer case 120, a locking hole 126 is formed in the auxiliary cover 125, and the locking hole of the auxiliary cover 125 is formed. The elastic rocker 115 may be installed in the substrate case 114 to correspond to the reference numeral 126. In this embodiment, the elastic rockers 115 may be installed in pairs on both sides of the substrate case 114. The elastic rocker 115 is accommodated into the inside of the substrate case 114 when the external force is applied, and is restored to its original state when the external force is released. The configuration of the elastic rocker 115 is widely used in various technical fields. It corresponds to a typical configuration, and the specific configuration is also present in various forms, it is to be noted that the detailed description and illustration are omitted in this embodiment.

In addition, one end of the protective circuit board 113 and the pouch type bare cell 111 may be accommodated in the inner receiving space of the auxiliary cover 125 formed at one side of the outer case 120. In addition, a plurality of terminal holes 128 for exposing the external connection terminals 116 of the protective circuit board 113 may be formed in the auxiliary cover 125 of the outer case 120. The outer case 120 may be formed by injection molding a polymer resin.

 In addition, two side surfaces 124 of the outer case 120 may be formed with a plurality of fastening grooves 127 as shown in Figure 2, the plurality of fastening grooves 127 is a skirt of the outer cover to be described later The fastening part is combined with a plurality of protruding fasteners formed on the inner surface of the part. The plurality of fastening grooves 127 formed on the two side surfaces 124 of the outer case 120 may have various shapes such as rectangular, elliptical, and track type as long as they can correspond to the protruding fasteners to be described later. 127) is not intended to limit the invention. In addition, the fastening groove 127 may have one or more various numbers, and the present invention is not limited to the number of the fastening grooves 127. Details relating to the coupling of the plurality of fastening grooves 127 and the protruding fasteners will be described later.

Figure 2b is a perspective view showing a state that the outer cover is coupled to the outer case.

The outer cover 130 may cover the receiving space of the outer case 120, the outer cover 130 is the main cover portion 131 having a size corresponding to the open side of the outer case, the main The skirt 132 is bent at both ends of the cover 131 and disposed to face the left and right side surfaces 124 of the outer case.

A plurality of protruding fasteners 133 are formed in the skirt 132 of the outer cover 130, and the protruding fasteners 133 are inserted into the plurality of fastening grooves 127 formed on the side of the outer case. And fixed to form a fastening part. The protruding fastener 133 formed in the skirt 132 may be in the form of a fastening protrusion processed through a lancing process, wherein the outer cover 130 is made of a metal material for the lancing process. I can't. However, the present invention is not limited to the material of the outer cover 130.

In addition, the protruding fastener 133 in the form of a fastening protrusion may have a rectangular cross-sectional shape, that is, the protruding fastener 133 may cross two perpendicular to the cross-sectional shape. The length in the direction may form a long side and a short side. Here, the long side and the short side are of course due to the relative length difference. In addition, the protruding fastener 133 may have a long side disposed in a direction parallel to the longitudinal direction of the skirt 132 as in the present embodiment, and the cross-sectional shape of the protruding fastener 133 may be It may be in the shape of a rectangle, oval, track, or the like. Of course, the fastening groove 127 of the outer case may be formed to correspond to the cross-sectional shape of the protruding fastener 133. At this time, the size of the fastening groove 127 is preferably formed to correspond to the cross-sectional size of the protruding fastener 133. This is to allow the circumferential surface of the protruding fastener 133 and the inner surface of the fastening groove 127 to be in close contact with each other. As a result, the insertion of the protruding fastener 133 into the fastening groove 127 and Fastening can be made more robust.

In addition, a first step 129a for mounting the main cover part of the outer cover to be described later may be formed on the rear surface 123 of the four surfaces of the outer case 120, and thus the first step 129a may be formed. The rear surface 123 and the remaining two side surfaces 124 of the formed outer case 120 may be connected to each other having a second step 129b at a connection portion thereof. The first step 129a corresponds to the thickness of the main cover part 131 of the outer cover 130, and the main cover part 131 of the outer cover 130 is formed by the first step 129a. It may be coupled with the outer case 120 while being connected to the same height as the outer case 120. In addition, the rear surface 123 in which the first step 129a is formed is connected to form the other two side surfaces 124 and the second step 129b, wherein the second step 129b is formed by an outer cover ( Corresponding to the thickness of the skirt 132 of the 130, by the second step 129b the skirt 132 of the outer cover 130 is the auxiliary cover 125 and the rear of the outer case 120 It may be coupled to the same height as 123 and coupled to the outer case 120.

In addition, a plurality of fastening grooves 127 may be formed on the two side surfaces 124 of the outer case 120, and the plurality of fastening grooves 127 may be formed on the outer cover 130. The fastening part is combined with the plurality of protruding fasteners 133 formed on the inner surface of the skirt part 132. The plurality of fastening grooves 127 formed on the two side surfaces 124 of the outer case 120 may have various shapes such as rectangular, elliptical, and track type as long as they can correspond to the protruding fasteners 133. The present invention is not limited to the shape of the groove 127. In addition, the fastening groove 127 may have one or more various numbers, and the present invention is not limited to the number of the fastening grooves 127.

Figure 2c is a perspective view showing the coupling of the taping member.

The taping member 140 may be used to reinforce the coupled state of the outer case and the outer cover. That is, the taping member 140 is attached to both the outer case and the outer cover, both sides thereof in a state surrounding the fastening portion between the outer case and the outer cover. Here, the taping member 140 may have a form of locally enclosing only the fastening portion between the outer case and the outer cover, and may have a single sheet configuration surrounding the entire outer surface of the outer cover and a portion of the outer surface of the outer case. In addition, the taping member 140 of the single sheet configuration may be in the form of wrapping only a portion of the bottom surface of the outer case, in some cases the taping member 140 may be in the form of wrapping the entire bottom surface of the outer case.

In addition, the taping member 140 may be a label including not only the discharge capacity or the manufacturing date of the secondary battery, but also a protection or insulation function for the secondary battery. In the present embodiment, the taping member is a single sheet configuration that covers the entire outer surface of the outer cover and a part of the outer surface of the outer case, and the taping member 140 having a single sheet configuration as described above is taken as an example.

Hereinafter, a secondary battery according to an embodiment of the present invention will be described in more detail. 3 is a cross-sectional view showing a cross section taken along the line A-A of FIG. 3 illustrates an auxiliary cover 125, a bottom surface 121, and both side surfaces 124 of four surfaces constituting the outer case. Fastening grooves 127 are formed on both side surfaces 124 of the outer case as described above, and protruding fastenings are formed on the skirt portion 132 (see FIG. 2B) of the outer cover 130 (see FIG. 2B). The fastening part is formed by inserting and fixing the part 133 (see FIG. 2B). In addition, both side surfaces 124 of the outer case are connected to form the secondary cover 125 and the second step 129b, the thickness of the second step 129b is the outer cover 130 (see Fig. 2b) Is preferably equal to the skirt portion 132 (see FIG. 2B). In addition, a locking hole 126 is formed at an upper end of the auxiliary cover 125 to correspond to an elastic rocker 115 (see FIG. 2A) formed in the substrate case 114 (see FIG. 2A). 2a) and the locking hole 126 may be coupled to the core pack 110 (see FIG. 2A) in a more stable state in the inner space of the outer case 120 (see FIG. 2A). Furthermore, a plurality of terminal holes 128 are formed in the auxiliary cover 125 to expose the external connection terminals 116 (see FIG. 2A) of the protection circuit board 113 (see FIG. 2A). Finally, the auxiliary cover 125 may have a substrate accommodating space 122 formed therein, and the substrate accommodating space 122 may include a protective circuit board 113 (see FIG. 2A) and a pouch type bare cell 111. One end of the same can be inserted.

4 is a cross-sectional view illustrating a cross section taken along line B-B in FIG. 2C.

The fastening part 150 shown in FIG. 4 serves to couple the outer case and the outer cover to prevent them from being separated. In other words, the fastening part 150 is coupled to the skirt portion 132 of the outer cover and the side surface 124 of the outer case, so that the outer cover and the outer case to cover the open side of the outer case Combined. That is, the fastening part 150 has a plurality of protruding fasteners 133 formed on the inner surfaces of both skirt portions 132 of the outer cover, and a plurality of protruding fasteners 133 corresponding to the protruding fasteners 133 on the outer case. As the fastening groove 127 is formed, the protruding fastener 133 of the outer cover may be inserted into and fixed to the fastening groove 127 of the outer case. Here, the protruding fastener 133 may be in the form of a fastening protrusion processed through a lancing process, and the outer cover may be made of a metal material for the lancing process. The fastening groove 127 is formed to correspond to the cross-sectional shape of the protruding fastener 133, and the size of the fastening groove 127 corresponds to the cross-sectional size of the protruding fastener 133. It is preferably formed to be. This is to allow the insertion and fastening of the protruding fastener 133 to the fastening groove 127 to be securely performed.

As described above, since the secondary battery according to the present invention is formed by a process of assembling various components manufactured in advance for an exterior case for a core pack, not only the manufacturing process is performed more easily, but also the completed state is If it is poor, the separation and recombination can be made easily, the failure rate can be greatly reduced.

1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

Figure 2a is a perspective view showing a state that the core pack is accommodated inside the outer case.

Figure 2b is a perspective view showing a state that the outer cover is coupled to the outer case.

Figure 2c is a perspective view showing the coupling of the taping member.

3 is a cross-sectional view showing a cross section taken along the line A-A of FIG.

4 is a cross-sectional view illustrating a cross section taken along line B-B in FIG. 2C.

<Explanation of symbols for the main parts of the drawings>

100; Secondary battery 110; Core pack

120; Outer case 130; Outer cover

140; Taping member 150; Fastening part

111; Pouched bare cell 112; Double-sided tape

113; Protective circuit board 114; Board Case

115; Elastic rocker 116; External connection terminal

121; Bottom 122; Board receiving space

123; Rear 124; Side 125; Auxiliary cover 126; Locking hole 127; Fastening groove 128; Terminal hole 129a; First step 129b; Second step 131; Main cover portion 132; Skirt section 133; Protruding Fasteners

Claims (17)

A pouch-type bare cell formed by exposing an electrode tab to one side; A protective circuit board connected to the electrode tab of the pouch-type bare cell; An outer case accommodating the protective circuit board and surrounding a lower portion and a side portion of the pouch-type bare cell; An outer cover surrounding the top and sides of the pouch-type bare cell; A fastening part for coupling the outer case and the outer cover; Including, The outer case has a bottom surface and four surfaces extending in series from four ends of the bottom surface, and forms a receiving space of the pouch-type bare cell and the protective circuit board inside the bottom surface and the four surfaces, The outer cover may include a main cover part having a size corresponding to an open side of the outer case, and a skirt part bent from both ends of the main cover part to cover outer surfaces of both sides of the outer case, respectively. Secondary battery. delete The method according to claim 1, Secondary batteries, characterized in that a plurality of fastening grooves are formed on opposite sides of the outer case. The method according to claim 1, The secondary battery of claim 4, wherein one of four surfaces of the outer case is formed with a terminal hole through which the external connection terminal of the protective circuit board is exposed. delete The method according to claim 1, The outer case has a first step for mounting the main cover of the outer cover is formed on the other side facing the surface on which the terminal hole is formed, the height of the first step is characterized in that the same as the thickness of the main cover Secondary battery. The method according to claim 6, The outer case is connected to a surface on which the first step is formed and the other two side surfaces form a second step, and the height of the second step is the same as the thickness of the skirt of the outer cover. The method of claim 3, Secondary battery, characterized in that a plurality of protruding fasteners are formed on the inner surface of the skirt portion. 9. The method of claim 8, The protruding fastener is a secondary battery, characterized in that the projection is formed on the inner surface of the two skirt portion through a lancing (lancing) process. 9. The method of claim 8, The fastening part is a secondary battery, characterized in that to combine the two skirt parts of the outer cover and both sides of the outer case covered by the skirt. 11. The method of claim 10, The fastening part includes a plurality of the protruding fasteners formed on the inner surfaces of the two skirt parts of the outer cover, and the fastening grooves formed on both sides of the outer case covered by the skirt part. 12. The method of claim 11, The size of the fastening groove is a secondary battery, characterized in that corresponding to the size of the protruding fastener. 11. The method of claim 10, Secondary battery, characterized in that it further comprises a taping member for wrapping the coupling portion of the fastening portion. 14. The method of claim 13, The taping member is formed as a single sheet, the secondary battery characterized in that it covers the entire outer surface of the outer cover and the entire bottom or part of the outer case, including the engaging portion by the projection-shaped fastener and the locking groove. 14. The method of claim 13, The taping member is a secondary battery, characterized in that the label. The method according to claim 1, The secondary battery of claim 1, further comprising a substrate case coupled to one surface of the protective circuit board and the other side coupled to one surface of the electrode tab of the pouch-type bare cell. 17. The method of claim 16, An elastic rocker is installed in the substrate case, and the elastic rocker is elastically coupled to a locking hole formed on an inner surface of the outer case.

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