Patent Description:
Accordingly, high-performance secondary batteries allowing repeated charging and discharging are being actively studied.

The lithium secondary battery mainly uses lithium-based oxides and carbonaceous materials as a positive electrode active material and a negative electrode active material, respectively. In addition, the lithium secondary battery includes an electrode assembly in which a positive electrode plate coated with the positive electrode active material and a negative electrode plate coated with the negative electrode active material are disposed with a separator being interposed therebetween, and an exterior hermetically containing the electrode assembly together with an electrolyte.

Meanwhile, the lithium secondary battery may be classified into a can-type secondary battery in which the electrode assembly is included in a metal can and a pouch-type secondary battery in which the electrode assembly is included in a pouch made of aluminum laminate sheets, depending on the shape of the battery case. In addition, the can-type secondary battery may also be classified into a cylindrical battery and a rectangular battery depending on the shape of the metal can.

Here, the pouch of the pouch-type secondary battery generally includes a lower sheet and an upper sheet covering the lower sheet, and the electrode assembly in which a positive electrode, a negative electrode are and a separator are stacked and rolled is accommodated in the pouch. In addition, after the electrode assembly is accommodated, the edges of the upper sheet and the lower sheet are sealed by thermal fusion or the like. Moreover, an electrode tab drawn from each electrode is coupled to the electrode lead, and an insulating film may be added to a portion of the electrode lead that is in contact with the sealing portion.

As described above, the pouch-type secondary battery may be freely configured in various forms and realize a secondary battery of the same capacity with smaller volume and mass. However, since the pouch-type secondary battery uses a soft pouch as a container, unlike the can-type secondary battery, the pouch-type secondary battery may suffer from a low mechanical strength and a possibility of moisture infiltration, and may have a safety problem since it may cause explosion of the battery due to high temperature and high pressure inside the battery, which may be caused by an abnormal operating state of the battery, such as an internal short circuit, an overcharged state exceeding an allowable current and voltage, exposure to high temperature, an impact by dropping or the like.

In addition, the pouch-type secondary battery includes various inflammable materials and thus has a serious safety problem such as ignition and explosion, caused by overcharge, overcurrent, other physical external shock, and the like. Thus, the secondary battery includes a protection circuit module (PCM) electrically connected to the battery cell to effectively control abnormal conditions such as overcharge.

<FIG> is an exploded perspective view schematically showing some components of a conventional pouch-type secondary battery pack.

Referring to <FIG>, the conventional secondary battery pack <NUM> uses a connection member <NUM> for electrically connecting a protection circuit module <NUM> and a battery cell <NUM>. The connection member <NUM> is respectively coupled to electrode leads <NUM>, <NUM> formed at the battery cell <NUM> and a connection terminal (not shown) of the protection circuit module <NUM> by welding.

More specifically, the connection member <NUM> has one portion 13A bonded to a connection terminal of the protection circuit module <NUM>, and the other portion 13B of the connection member <NUM> is bent from one portion 13A to protrude outward so as to be bonded to the electrode leads <NUM>, <NUM> of the battery cell <NUM>.

However, a bent and extended portion of the connection member bonded to the electrode lead should be additionally bent while the conventional protection circuit module is installed to the battery cell. Accordingly, the installation work of the protection circuit module is complicated and the installation time is elongated.

Further, since the connection member has a complicated shape including one portion bonded to the connection terminal formed at the printed circuit board and the other portion bent and extended from the one portion, more manufacturing cost and more manufacturing time are required.

<CIT>,, <CIT>, <CIT>, and <CIT> disclose a secondary battery cell having a printed circuit board.

The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a pouch-type secondary battery pack having a simplified manufacturing process with a reduced number of components.

In one aspect of the present disclosure, there is provided a pouch-type secondary battery pack as defined in the appended set of claims, the pouch-type secondary battery pack comprising:.

Here, the lead connection plate may be formed with a single flat sheet.

Also, the lead connection plate may have one surface, at least a portion of which is bonded to one surface of the printed circuit board, and the other surface, at least a portion of which is bonded to the electrode lead.

Moreover, the exposing portion is a perforation hole perforated from one surface to the other surface of the printed circuit board or a recessed groove inwardly recessed from an outer circumference of the printed circuit board.

In addition, the protection circuit module further includes a protection circuit module (PCM) insulation pad made of an electrically insulating material and located at the other surface of the printed circuit board.

Also, the pouch exterior may have an accommodation portion in which the electrode assembly and the electrolyte are accommodated and a sealing portion formed around the accommodation portion.

Moreover, the protection circuit module may be placed on a terrace portion so that the other surface of the PCM insulation pad contacts an upper surface of the terrace portion of the sealing portion at which the electrode lead protrudes.

In addition, the PCM insulation pad has a communicating portion formed to communicate with the exposing portion so that a portion of the lead connection plate is exposed to the outside.

Further, the communicating portion may have a communication hole communicating with the perforation hole and perforated from one surface to the other surface of the PCM insulation pad or an inwardly concave groove communicating with the recessed groove and inwardly recessed at an outer circumference of the PCM insulation pad.

Also, the printed circuit board may have an embedded portion in which a portion of the PCM insulation pad is embedded.

Moreover, the embedded portion may be at least one of a fixing groove formed by inwardly digging a portion of the outer circumference of the printed circuit board and a fixing hole inwardly recessed to a predetermined depth from the other surface of the printed circuit board.

In addition, the fixing hole may be formed at both sides of the printed circuit board based on a center thereof.

Also, the PCM insulation pad may be formed by providing a hot-melt resin to the other surface of the printed circuit board and curing the hot-melt resin.

Moreover, at least a portion of the PCM insulation pad may be made of a transparent material from one surface to the other surface thereof.

In addition, the protection circuit module may further include another printed circuit board connected and coupled to an external input/output terminal formed at the printed circuit board, and an inclined portion may be formed at a location of the other surface of the printed circuit board, which corresponds to a location at which the another printed circuit board is connected and coupled to one surface of the printed circuit board.

If the pouch-type secondary battery pack according to an embodiment of the present disclosure is used, the lead connection plate and the electrode lead may be easily welded through the exposing portion formed at the printed circuit board, and the lead connection plate may have a reduced size, compared to the conventional art. In addition, it is unnecessary to bend the lead connection plate in the process of placing the protection circuit module on the terrace portion of the battery cell.

Thus, the pouch-type secondary battery pack of the present disclosure may reduce the size of components and simplify the manufacturing process, thereby ultimately reducing the manufacturing cost.

Also, according to an embodiment of the present disclosure, since the PCM insulation pad formed of a hot melt resin does not include a solvent containing a harmful component, it is possible to enhance the safety of a manufacturer and a user when the PCM insulation pad is used.

Moreover, according to an embodiment of the present disclosure, the PCM insulation pad of the present disclosure may stably protect devices and components mounted to the printed circuit board and also effectively prevent the devices and components from being damaged or deviated due to an external impact.

In addition, according to an embodiment the present disclosure, since the PCM insulation pad of the present disclosure is interposed between the terrace portion and the printed circuit board, it is possible to prevent the protection circuit module and the battery cell from being short-circuited or broken-down unintentionally.

Also, according to an embodiment of the present disclosure, since the PCM insulation pad of the present disclosure has a communicating portion in communication with the perforation hole or the recessed groove of the printed circuit board, it is possible to prevent the PCM insulation pad from contacting a welding rod and to cause no interfere with the scanned laser for welding, thereby ensuring the welding process to be performed smoothly and thus improving the manufacturing efficiency.

Further, according to an embodiment of the present disclosure, since the printed circuit board of the present disclosure has an embedded portion formed to prevent the PCM insulation pad from being easily detached due to an external impact, the PCM insulation pad may be fixed firmly to the other surface of the printed circuit board, thereby effectively improving the durability of the secondary battery pack.

<FIG> is a perspective view schematically showing some components of a pouch-type secondary battery pack according to an embodiment of the present disclosure. In addition, <FIG> is a partial perspective view schematically showing some components of the pouch-type secondary battery pack according to an embodiment of the present disclosure.

Referring to <FIG> and <FIG>, the pouch-type secondary battery pack <NUM> includes a battery cell <NUM> and a protection circuit module <NUM>.

Here, the battery cell <NUM> is a pouch-type battery cell. In particular, the pouch-type battery cell <NUM> includes an electrode assembly (not shown), an electrolyte (not shown), and a pouch exterior <NUM>. Also, the electrode assembly is sealed in the pouch exterior together with the electrolyte, and electrode leads <NUM>, <NUM> are formed at one side of the pouch-type battery cell <NUM>.

In addition, the electrode assembly (not shown) may be configured such that at least one positive electrode plate and at least one negative electrode plate are disposed with a separator interposed therebetween. More specifically, the electrode assembly may be classified into a wound type in which one positive electrode plate and one negative electrode plate are wound together with a separator, a stacking type in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked with a separator interposed therebetween, and the like.

Further, the pouch exterior <NUM> may be configured to have an outer insulating layer, a metal layer and an inner adhesive layer. The pouch exterior <NUM> may be configured to include a metal thin film, for example an aluminum thin film, in order to protect inner components such as the electrode assembly and the electrolyte, to enhance electrochemical properties by the electrode assembly and the electrolyte, and to improve heat dissipation.

Further, the aluminum thin film may be interposed between the insulating layers made of an insulating material to secure electrical insulation between components inside the battery cell <NUM>, such as the electrode assembly and the electrolyte, or to other components outside the battery cell <NUM>.

In addition, the pouch exterior <NUM> may be composed of two pouches, at least one of which may have a concave inner space formed therein. Also, the pouch exterior <NUM> may have an accommodation portion <NUM> in which the electrode assembly and the electrolyte are accommodated.

Moreover, the pouch exterior <NUM> may have a sealing portion <NUM> formed around the accommodation portion <NUM> by thermally fusing two pouches so that the inner space of the accommodation portion <NUM> accommodating the electrode assembly is sealed. For example, as shown in <FIG>, a terrace portion <NUM> sealed may be formed at the front outer circumference of the pouch exterior <NUM>.

Further, each pouch-type battery cell <NUM> includes electrode leads <NUM>, <NUM>, and the electrode leads <NUM>, <NUM> may include a positive electrode lead <NUM> and a negative electrode lead <NUM>. Here, each of the electrode leads <NUM>, <NUM> has a plat shape, when being viewed in the direction F depicted in <FIG>, so that two broad surfaces are respectively located at upper and lower portions.

Here, the terms indicating directions such as front, rear, left, right, upper and lower directions may be changed depending on the position of an observer or the shape of an object. For the sake of convenience of description, in the present specification, directions are classified into front, rear, left, right, upper and lower directions, based on the F direction.

For example, as shown in <FIG>, one electrode lead <NUM> may be formed to protrude at one side of one side surface of the terrace portion <NUM> of the battery cell <NUM>, and the other electrode lead <NUM> may be separated from one electrode lead <NUM> to protrude from the other side of one side surface of the terrace portion <NUM>.

The configuration of the pouch-type battery cell <NUM> described above is obvious to those skilled in the art and thus is not described in detail. In addition, the pouch-type secondary battery pack <NUM> according to the present disclosure may employ various battery cells known at the time of filing of this application.

In addition, the protection circuit module <NUM> includes a printed circuit board <NUM> at which a protection circuit is formed. In particular, the protection circuit module <NUM> may include a printed circuit board <NUM> and another printed circuit board <NUM> coupled to an external input/output terminal <NUM> of the printed circuit board <NUM>.

At this time, the another printed circuit board <NUM> may have a connector (not shown) formed at one end thereof for the connection with other external devices. Further, the another printed circuit board <NUM> may be a flexible printed circuit board (FPCB) having a flexible substrate.

Further, the protection circuit module <NUM> includes a lead connection plate <NUM> formed at one surface of the printed circuit board <NUM> so that the printed circuit board <NUM> is electrically connected to the electrode leads <NUM>, <NUM> of the battery cell <NUM>.

<FIG> is a plane view (a), a front view (b) and a side view (c) schematically showing a lead connection plate of the pouch-type secondary battery pack according to an embodiment of the present disclosure.

Referring to <FIG> along with <FIG>, the lead connection plate <NUM> may be formed with a single flat sheet. In addition, the lead connection plate <NUM> may be mounted to have a plane parallel to one surface of the printed circuit board <NUM>. Further, one surface <NUM> of the lead connection plate <NUM> may be bonded to a connection terminal (not shown) formed at the printed circuit board <NUM>, and the other surface <NUM> may be bonded to the electrode leads <NUM>, <NUM> of the battery cell <NUM>.

For example, as shown in <FIG>, the protection circuit module <NUM> may have two lead connection plates <NUM> coupled and connected to two electrode leads <NUM>, <NUM>, and the lead connection plate <NUM> may be mounted to have a plane parallel to one surface of the printed circuit board <NUM>.

Thus, according to this configuration of the present disclosure, since the lead connection plate is formed with a single sheet, unlike the conventional art, the process of bending the lead connection plate may not be performed in the process of placing the protection circuit module on the terrace portion of the battery cell. Also, the shape of the lead connection plate is not complicated, compared with a conventional member, and the lead connection plate is formed in a smaller size, thereby reducing the manufacturing cost.

Referring to <FIG> along with <FIG> again, an exposing portion <NUM> is formed at the other surface of the printed circuit board <NUM> to expose at least a portion of the lead connection plate <NUM>.

Specifically, the exposing portion <NUM> may have an opened shape such that one surface of the lead connection plate <NUM> is heated so that the other surface of the lead connection plate <NUM> is fused and bonded to the electrode leads <NUM>, <NUM> of the battery cell <NUM>. Accordingly, the exposing portion <NUM> may have an appropriate size so that the lead connection plate <NUM> may be welded and coupled to the electrode leads <NUM>, <NUM>.

For example, as shown in <FIG>, the exposing portion <NUM> is a perforation hole <NUM> perforated from one surface to the other surface of the printed circuit board <NUM>. In addition, two perforation holes <NUM> may be formed at both sides of the printed circuit board <NUM> based on a center thereof. The perforation holes <NUM> may be formed in a rectangular shape at both sides of the printed circuit board <NUM>, in a plane view.

Thus, according to this configuration of the present disclosure, since the lead connection plate <NUM> and the electrode leads <NUM>, <NUM> may be welded easily through the exposing portion <NUM>, the lead connection plate <NUM> and the electrode leads <NUM>, <NUM> may be bonded easily by welding or the like.

<FIG> is a partial perspective view schematically showing some components of a pouch-type secondary battery pack according to another embodiment of the present disclosure. In addition, <FIG> is a side view schematically showing a part of the pouch-type secondary battery pack according to another embodiment, depicted in <FIG>.

Referring to <FIG>, the exposing portion <NUM> is a recessed groove <NUM> inwardly recessed at an outer circumference of the printed circuit board 121A of the protection circuit module 120A. Specifically, the recessed groove <NUM> may have an inwardly recessed structure at the outer circumferential surface of the rear side of the printed circuit board 121A.

For example, as shown in <FIG>, two recessed grooves <NUM> may be formed at both sides of the printed circuit board 121A based on the center thereof.

Thus, according to this configuration of the present invention, compared with the perforation hole <NUM> (<FIG>), the recessed groove <NUM> is shaped so that one side is opened to the outside, thereby reducing the case that the exposing portion <NUM> interferes with another object. Thus, it is easier to allow a welding tool to contact the lead connection plate <NUM> during a welding process or to set a target to which heat is applied by laser irradiation or the like at a predetermined distance.

Further, a plurality of elements <NUM> or parts <NUM> may be mounted to the printed circuit board 121A. Here, the elements <NUM> and the parts <NUM> are general elements and parts used in the secondary battery pack 100A and will not be described in detail here.

Meanwhile, referring to <FIG> again, the protection circuit module <NUM> further includes a PCM insulation pad <NUM> made of an electrically insulating material. Also, the PCM insulation pad <NUM> may be provided at the other surface of the printed circuit board <NUM> so as not to cover the exposing portion <NUM>. For example, as shown in <FIG>, the PCM insulation pad <NUM> may be positioned between two perforation holes <NUM>.

Here, the electrically insulating material may be a polymer compound with a low electrical conductivity. For example, the PCM insulation pad <NUM> may be made of a polymeric resin, silicone, rubber, or the like.

Further, the PCM insulation pad <NUM> may be formed by curing a hot-melt type polymer resin.

More specifically, the hot-melt type resin may be a hot-melt resin. The hot-melt resin is a solvent-free resin and may be a thermoplastic resin that is solid at normal temperature but is melted at a melting point or higher when heated and is solidified by cooling to form an adhesive.

Thus, according to this configuration of the present disclosure, the PCM insulation pad <NUM> made of a hot-melt resin does not contain a solvent containing harmful components. Thus, if the PCM insulation pad <NUM> is used, the safety of a manufacturer and a user may be enhanced.

In addition, the PCM insulation pad <NUM> may be located at the other surface of the printed circuit board <NUM> on which the elements <NUM> and the parts <NUM> are mounted. That is, the PCM insulation pad <NUM> may be formed by mounting the elements <NUM> and the parts <NUM> on the other surface of the printed circuit board <NUM>, applying a molten high-temperature resin to the upper surface, and then cooling the applied resin to be cured.

Thus, according to this configuration of the present disclosure, the PCM insulation pad <NUM> may stably protect the elements <NUM> and the parts <NUM> mounted to the printed circuit board <NUM>. Accordingly, in the present disclosure, it is possible to effectively prevent the elements <NUM> and the parts <NUM> of the printed circuit board <NUM> from being damaged or deviated due to an external impact.

In addition, at least a portion of the PCM insulation pad <NUM> may be made of a transparent material from one surface to the other surface thereof. Specifically, the PCM insulation pad <NUM> may include a transparent material so that the elements and the parts mounted to the printed circuit board <NUM> may be checked by naked eyes.

For example, as shown in <FIG>, the PCM insulation pad <NUM> may be entirely formed of a transparent material so that the other surface of the printed circuit board <NUM> is observed.

<FIG> is a side view schematically showing that the protection circuit module of the pouch-type secondary battery pack according to an embodiment of the present disclosure is placed on the terrace portion.

Referring to <FIG> along with <FIG>, the protection circuit module <NUM> may be placed on the terrace portion <NUM> so that the other surface of the PCM insulation pad <NUM> is in contact with the upper surface of the terrace portion <NUM>, where the electrode leads <NUM>, <NUM> protrude on the sealing portion <NUM> of the battery cell <NUM>.

In other words, if the protection circuit module <NUM> is placed on the terrace portion <NUM> of the battery cell <NUM>, the PCM insulation pad <NUM> may be interposed between the other surface of the printed circuit board <NUM> and the terrace portion <NUM>.

Thus, according to this configuration of the present disclosure, since the PCM insulation pad <NUM> is interposed between the terrace portion <NUM> and the printed circuit board <NUM>, it is possible to prevent the protection circuit module <NUM> and the battery cell <NUM> from being short-circuited or broken-down unintentionally.

Further, in the conventional art, an insulating tape is separately attached to the terrace portion <NUM> to prevent a short circuit between the protection circuit module <NUM> and the battery cell <NUM>. However, in the present disclosure, the PCM insulation pad <NUM> may electrically insulate the protection circuit module <NUM> and the battery cell <NUM> without attaching such an insulating tape.

In addition, one surface of the PCM insulation pad <NUM> contacting the printed circuit board <NUM> may be formed along an outer surface of the elements <NUM> and the parts <NUM> of the printed circuit board <NUM>.

<FIG> is a partial perspective view schematically showing some components of a pouch-type secondary battery pack according to another embodiment of the present disclosure.

Referring to <FIG> along with <FIG>, a PCM insulation pad 140B according to another embodiment has a communicating portion <NUM> formed to communicate with the exposing portion <NUM> so that a portion of the lead connection plate <NUM> is exposed to the outside.

Specifically, the communicating portion <NUM> may be a communication hole <NUM> communicating with the perforation hole <NUM> and perforated from one surface to the other surface of the PCM insulation pad 140B. For example, as shown in <FIG>, two communication holes <NUM> may be formed to communicate with the perforation hole <NUM> formed in the printed circuit board <NUM>, and the communication holes <NUM> may be formed at both sides of the printed circuit board <NUM> based on the center thereof.

Referring to <FIG> again, in the PCM insulation pad 140A according to another embodiment, the communicating portion <NUM> may be an inwardly concave groove <NUM>.

Specifically, the inwardly concave groove <NUM> may communicate with the recessed groove <NUM> and be inwardly recessed from the outer circumference of the PCM insulation pad 140A.

For example, as shown in <FIG>, two inwardly concave grooves <NUM> may be formed to communicate with two recessed grooves <NUM> formed at the printed circuit board 121A, and the inwardly concave grooves <NUM> may be formed at both sides of the printed circuit board 121A based on the center thereof.

Thus, according to this configuration of the present disclosure, one surface of the lead connection plate <NUM> may be heated through the communicating portion <NUM> formed at the PCM insulation pad 140A so that the other surface of the lead connection plate <NUM> is easily bonded to the electrode the leads <NUM>, <NUM> of the battery cell <NUM>. That is, since the communicating portion <NUM> is formed to communicate with the perforation hole <NUM> or the recessed groove <NUM>, it is possible to prevent the PCM insulation pad 140A from contacting a welding rod and to cause no interfere with the scanned laser for welding, thereby ensuring the welding process to be performed smoothly.

Meanwhile, referring to <FIG>, the printed circuit board 121A may have an embedded portion <NUM> in which a portion of the PCM insulation pad 140A is embedded.

Specifically, the embedded portion <NUM> may have a fixing groove <NUM> formed by inwardly digging a portion of the outer circumference of the printed circuit board 121A. For example, as shown in <FIG>, the fixing groove <NUM> may be formed at the right side of the printed circuit board 121A to be inwardly dug further to the other region. In addition, a portion of the PCM insulation pad 140A may be embedded or inserted into the fixing groove <NUM>.

Thus, according to this configuration of the present disclosure, the PCM insulation pad <NUM> may be fixed to the other surface of the printed circuit board 121A by the fixing groove <NUM> so that the PCM insulation pad <NUM> is not easily deviated due to an external impact. Accordingly, the durability of the product according to the present disclosure may be effectively improved.

Referring to <FIG> again, the embedded portion <NUM> may have a fixing hole <NUM> formed to be inwardly recessed to a predetermined depth from the other surface of the printed circuit board 121A. In addition, the fixing hole <NUM> may be formed to be perforated from one surface to the other surface of the printed circuit board 121A.

<FIG> is a cross-sectioned view, taken along a dotted line C' of <FIG>.

Referring to <FIG>, the printed circuit board 121A according to another embodiment of the present disclosure has a fixing hole <NUM> formed at the embedded portion <NUM> to be inwardly recessed to a predetermined depth from the other surface of the printed circuit board 121A to serve as the embedded portion <NUM>.

For example, as shown in <FIG>, the fixing hole <NUM> may be perforated from one surface 121C to the other surface 121D of the printed circuit board 121A. At this time, the fixing hole <NUM> may have a stepped structure K whose diameter gradually increases from one surface 121C to the other surface 121D of the printed circuit board 121A. In addition, a portion of the PCM insulation pad 140A may be applied along the inner wall of the interior space of the fixing hole <NUM>.

Also, a portion of the PCM insulation pad 140A is embedded in the fixing hole <NUM> to fix the PCM insulation pad 140A to the other surface of the printed circuit board 121A so that the PCM insulation pad 140A is not easily deviated due to an external impact.

Further, the fixing hole <NUM> may be formed at both sides of the printed circuit board 121A based on the center thereof. For example, as shown in <FIG>, two fixing holes <NUM> may be formed at both sides of the printed circuit board 121A based on the center thereof, respectively. Thus, since a portion of both sides of the PCM insulation pad <NUM> is embedded or inserted into the fixing hole <NUM>, the PCM insulation pad 140A may be stably fixed to the other surface of the printed circuit board 121A.

<FIG> is a cross-sectioned view schematically showing a portion of a printed circuit board, employed at a pouch-type secondary battery pack according to still another embodiment of the present disclosure.

Referring to <FIG>, a fixing hole 148B according to another embodiment may be formed by digging one surface of the printed circuit board 121B to a predetermined depth D. Also, a portion of the PCM insulation pad 140A may be embedded in the inner space of the fixing hole 148B.

Thus, according to this configuration of the present disclosure, it is possible to prevent a portion of the PCM insulation pad 140A from being lost to the outside through the fixing hole 148B, thereby reducing defective products caused by contamination of the melted PCM insulation pad 140A.

<FIG> is a partial plane view schematically showing the protection circuit module 120E of the pouch-type secondary battery pack according to another embodiment of the present disclosure.

Referring to <FIG>, a secondary battery pack <NUM> according to another embodiment may have an inclined portion <NUM> formed at the printed circuit board 121E to have a thickness gradually decreasing in an outer direction S from the inside.

Specifically, the inclined portion <NUM> may be formed at a location on the other surface of the printed circuit board <NUM> corresponding to a location where another printed circuit board <NUM> is connected and coupled to one surface of the printed circuit board 121E.

In addition, when the PCM insulation pad 140E is formed, the inclined portion <NUM> may allow the applied molten resin to flow down along the inclined portion <NUM> and to be applied to one portion E of another printed circuit board <NUM>.

Further, the melted resin applied to one portion E of another printed circuit board <NUM> is formed as a portion of the PCM insulation pad 140E after it is cured. Also, another printed circuit board <NUM> may be fixed on the printed circuit board <NUM> by means of the adhesive force of the PCM insulation pad 140E.

Thus, according to this configuration of the present disclosure, since the melted resin is formed as portion of the PCM insulation pad 140E on another printed circuit board <NUM> along the inclined portion <NUM> of the present disclosure, it is possible to effectively prevent another printed circuit board <NUM> from being deviated from the printed circuit board 121E due to an external impact.

Meanwhile, even though the terms indicating directions such as upper, lower, left, right, front and rear directions are used in the specification, it is obvious to those skilled in the art that these merely represent relative locations for convenience in explanation and may vary based on a location of an observer or an object.

The scope of protection is solely defined by the appended claims.

Claim 1:
A pouch-type secondary battery pack, comprising:
a battery cell (<NUM>) in which an electrode assembly is sealed in a pouch exterior (<NUM>) together with an electrolyte, the battery cell having an electrode lead (<NUM>, <NUM>) formed at one side thereof; and
a protection circuit module (<NUM>) having a printed circuit board (<NUM>) with a protection circuit formed thereon and a lead connection plate (<NUM>) formed at one surface of the printed circuit board (<NUM>) so that the printed circuit board (<NUM>) is electrically connected to the electrode lead (<NUM>, <NUM>) of the battery cell (<NUM>), the protection circuit module (<NUM>) having an exposing portion (<NUM>) formed at the other surface of the printed circuit board (<NUM>) to expose at least a portion of the lead connection plate (<NUM>),
wherein the exposing portion (<NUM>) is a perforation hole (<NUM>) perforated from one surface to the other surface of the printed circuit board (<NUM>) or a recessed groove (<NUM>) inwardly recessed from an outer circumference of the printed circuit board (<NUM>),
the protection circuit module (<NUM>) further includes a protection circuit module (PCM) insulation pad (<NUM>) made of an electrically insulating material and located at the other surface of the printed circuit board (<NUM>), and
the PCM insulation pad (<NUM>) has a communicating portion (<NUM>) formed to communicate with the exposing portion (<NUM>) so that a portion of the lead connection plate (<NUM>) is exposed to the outside.