KR101182150B1 - Battery Pack of Structure of Improved Productivity and Stability - Google Patents

Abstract

The present invention provides a battery pack in which two or more battery cells are embedded in a pack case, and includes a protection circuit module for controlling overcharge, overdischarge, and overcurrent of the battery cells, wherein the pack case includes an upper case and a lower case. Consists of a case, the protection circuit module is electrically connected in a state that is physically isolated from the battery cells to provide a battery pack having a structure mounted on the module receiving portion formed on one side of the pack case.

Description

Battery Pack of Structure of Improved Productivity and Stability}

The present invention relates to a battery pack having an improved productivity and safety structure, and more particularly, a battery pack in which two or more battery cells are embedded in a pack case, to control overcharging, overdischarging, and overcurrent of the battery cells. It includes a protective circuit module, wherein the pack case is composed of an upper case and a lower case, the protective circuit module is electrically connected in a state that is physically isolated from the battery cells are formed on one side of the pack case The present invention relates to a battery pack having a structure mounted to a module accommodating portion.

As technology development and demand for mobile devices increase, the demand for secondary batteries as energy sources is rapidly increasing.

The secondary battery may be used in the form of a single battery, or in the form of a battery pack in which a plurality of unit cells are electrically connected, depending on the type of external device in which the secondary battery is used. For example, a small device such as a mobile phone can operate for a predetermined period of time with the output and capacity of one battery, while a medium or large size such as a notebook computer, a portable DVD, a small PC, an electric vehicle, a hybrid electric vehicle, or the like. Large devices require the use of battery packs due to power and capacity issues.

The battery pack is manufactured by connecting a plurality of unit cells arranged in series and / or in parallel and mounting a core pack including a protection circuit module and the like inside the pack case. In the case of using a rectangular or pouch type battery as a unit cell, it can be easily manufactured by stacking the wide surfaces to face each other and then connecting the electrode terminals by a connection member such as a bus bar. Therefore, in the case of manufacturing a three-dimensional battery pack having a hexahedral structure, a square or pouch type battery is advantageous as a unit cell.

On the other hand, the cylindrical battery generally has a larger capacitance than the square and pouch type batteries, but due to the external characteristics of the cylindrical battery is not easy to arrange in a laminated structure. However, when the shape of the battery pack is a linear or plate-like structure as a whole, there is a structural advantage over the square or pouch type.

Therefore, in the case of a notebook computer, a portable DVD, a small PC, and the like, battery packs in which a plurality of cylindrical batteries are connected in parallel and in series are used. As the structure of the core pack used for such a battery pack, for example, a linear structure of 2P (parallel) -3S (serial), a plate structure of 2P-3S, a linear structure of 2P-4S, a plate structure of 2P-4S, and the like. Is being used.

A parallel connection structure is achieved by arranging two or more cylindrical cells adjacent in their lateral direction with the electrode terminals oriented in the same direction, and welding the bus bars. Such parallel cylindrical cells are also referred to as "banks".

In series connection structure, two or more cylindrical cells are arranged in a lateral direction while two or more cylindrical cells are arranged long so that electrode terminals of opposite polarity are continuous or the electrode terminals are arranged in opposite directions. This is achieved by arranging adjacently in the furnace and then welding the bus bar.

In the electrical connection of such cylindrical cells, spot welding is generally performed using a thin plate-shaped bus bar such as a nickel plate. In addition, a battery pack is manufactured by connecting a protection circuit module to a core pack consisting of a parallel and / or series connection.

For example, FIG. 1 schematically illustrates a process of combining six cylindrical secondary batteries in a 2P (Parallel) -3S (Serial) electrical connection method, and FIG. 2 illustrates a shape of a core pack having such electrical connection. This is schematically illustrated.

Referring to these drawings, the six cylindrical cells 20, 21 are each arranged in two, with the positive electrode facing to the left, forming a total of three battery pairs, and by the nickel plate 30 disposed therebetween. The electrical connection is established. That is, in the nickel plate 30, two pairs of cells located on both sides thereof are joined by spot welding, so that adjacent cells (banks) in the vertical direction make a parallel connection, and the adjacent cells in the horizontal direction make a series connection. Is achieved. Thus, the overall 2P-3S connection structure is made.

In addition, each of the batteries 20 and 21 is connected to the protection circuit module 90 through the positive electrode wire 60, the negative electrode wire 70, and the detection signal wire 80 connected to the nickel plate 30. Electrical connection of the protection circuit module 90 to the respective wires 60, 70, and 80 is generally performed by soldering, and the battery pack places the core pack 50 inside the pack case (not shown). It is completed by mounting.

However, such a battery pack has many problems.

First, since the protection circuit module is mounted inside the pack case in a state of being in close contact with the side of the core pack, when the electrolyte leaks from the battery cell inside the pack case, the circuit of the protection circuit module is prevented by the electrolyte having high polarity. There is a problem that a malfunction or short occurs while being damaged.

Second, when the battery pack is soldered to electrically connect the connection member and the protection circuit module, damage to the battery cell or the protection circuit module may occur. Furthermore, since it is difficult to structurally fix the protection circuit module and the connection member in place, there is a problem that automation of the soldering process is not easy and expensive equipment is required even if the automation is performed.

Third, when an abnormality occurs in the battery pack, there is a problem that the entire battery pack must be discarded. In the battery pack manufacturing process, a plurality of inspection processes are performed, for example, inspection after core pack manufacture, inspection after performing initial charge and discharge, inspection after completion of final product, and the like. By the way, if a failure occurs in the inspection of the second half, which means that the failure of the finished battery pack, it is inevitable to discard the battery pack itself. For example, even if the protection circuit module is a normal product, a defect may occur in the process of manufacturing the battery pack, and in some cases, an inherent failure factor of the protection circuit module may cause a defect in the manufacturing process of the battery pack. In some cases. Therefore, the defect of the protection circuit module in the state that the battery pack is completed there is a problem directly connected to the defect of the battery pack.

Fourth, the battery pack has a problem that it is difficult to control the supply amount according to the demand. Since the manufacturing process of the core pack includes a process of connecting the protection circuit module to the battery cell, in order to meet the demand for the battery pack generated at a predetermined time, it is necessary to go through a process of manufacturing a battery pack by performing a series of working processes. As a result, the battery pack supply and demand control is not easy.

Therefore, there is a high need for a battery pack made of a structure having excellent productivity and safety to fundamentally solve these problems.

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

Specifically, an object of the present invention is to improve the safety of the battery pack, to easily achieve the automation, to minimize the cost loss in the event of an abnormal battery pack, it is easy to control the supply and demand of the battery pack It is to provide a battery pack.

The present inventors have designed a battery pack having a variety of structures, and reviewed a preferable structure in consideration of productivity and safety based on this, and as a result, the protective circuit module is mounted in a form that isolates the battery cells from the battery cells, but substantially in the final step. The present invention was completed by confirming that a battery pack having a structure that can be manufactured by mounting a module to be electrically connected can satisfy all of the desired objects.

Accordingly, the battery pack according to the present invention for achieving the above object is a battery pack in which two or more battery cells are built in a pack case, and a protection circuit module for controlling overcharge, overdischarge and overcurrent of the battery cells. The pack case includes an upper case and a lower case, and the protection circuit module is electrically connected to the battery cells in a physically isolated state, and is formed in a module accommodating portion formed on one outer surface of the pack case. Consists of a mounted structure.

In the above, 'electrically connected in a physically isolated state' means that the battery cells and the protection circuit module are electrically connected by a predetermined connection member, but the upper and lower cases in which the battery cells are built-in. This means that the battery pack inner space and the module accommodating part are separated from each other, except for the connection member, so that material does not move between the inner space and the module accommodating part. This means that the process of mounting the battery cells in the pack case and the process of mounting the protection circuit module in the pack case are separated.

Therefore, since the battery pack according to the present invention has a structure in which a protective circuit module is mounted on a module accommodating portion formed on one outer surface of the pack case, the protective circuit module can be kept in an isolated state from the battery cells. Even if the electrolyte leaks from the battery cell inside the pack case, it is possible to prevent the protection circuit module from being damaged by the electrolyte.

In addition, since the protective circuit module is mounted on the module accommodating part formed on the outer surface of the pack case, not inside the pack case, even if a defect occurs in the battery pack, the pack case (built-in battery cell) or the protection circuit module that caused the defect. By replacing bays, the cost increase due to failure can be minimized. This means that the process of manufacturing a battery pack intermediate product in which the battery cell is embedded in the pack case and the process of manufacturing a final battery pack by attaching a protection circuit module to the intermediate product can be separated. This means that the supply can be easily adjusted according to the demand for battery packs with only a large quantity of products produced.

In one preferred example, the pack case may have a structure in which a cover (a storing part cover) for sealing the protective circuit module is further included in a state in which the protective circuit module is mounted in the module accommodating part. With this structure, it is possible to protect the protection circuit module from external shocks and to prevent foreign substances from being inserted into the module housing.

In the above structure, the housing cover is not particularly limited as long as it is easy to be combined with the pack case, for example, may be coupled to the pack case by a mechanical fastening method. The coupling structure of the mechanical fastening method facilitates detachment of the protection circuit module when a failure occurs in the finally manufactured battery pack.

In one preferred embodiment, one or two or more fastening through-holes are formed in communication with the accommodating part cover and the pack case or module accommodating part corresponding thereto, and mechanically fastening by inserting a screw into the fastening through-hole. Can be achieved. For example, by sequentially inserting screws into a pair of fastening through-holes formed on both sides of the lower end of the module accommodating part and the accommodating part cover, mechanical fastening of the module accommodating part and the accommodating part cover can be easily achieved. .

Meanwhile, a socket type connection terminal for electrically connecting the protection circuit module to an external device may be located at one outer surface of the module accommodating part. The socket type connection terminal formed on one outer surface of the module accommodating portion enables easy electrical connection between the protection circuit module and the external device.

The socket type connection terminal is preferably formed on the protective circuit module, the housing cover may have a structure in which an opening is formed so that the socket type connection terminal is exposed to the outside.

The protection circuit module may be formed in various structures, for example, may be formed of a printed circuit board (PCB) structure.

Preferably, a slit groove for mounting the protection circuit module in the module accommodating portion is formed at the lower end of the inner surface in the longitudinal direction of the pack case, so that the protection circuit module can be stably mounted in the slit groove, and mounted in the slit groove. It is possible to prevent deviation of the protection circuit module in place.

In the conventional battery pack structure, soldering should be performed while the protection circuit module is positioned on the battery cells. Therefore, the battery cells and the protection circuit module must be stably fixed in place for automation of soldering. It was not easy due to the structural limitations of the protective circuit module. As a result, there was a need for expensive equipment with a complicated structure that can simultaneously perform the mutual positioning and soldering of the objects.

On the other hand, in the present invention, since the battery cells are embedded in a pack case of a predetermined type and the protection circuit module is mounted in a fixed position in the module accommodating portion, there is no need to separately perform the mutual position fixing of the objects, so that soldering is performed accordingly. The advantage is easy operation. Furthermore, the slit groove structure for the in-situ mounting of the protection circuit module secures the protection circuit module in place in the module accommodating portion, thereby further automating the soldering operation of the connection member and the protection circuit module electrically connected to the battery cells. Make it easy

As one example, the module accommodating portion is not particularly limited as long as it is a structure capable of stably mounting the protection circuit module. For example, the module accommodating portion may be formed on the lower case with an upper open structure. Therefore, the protective circuit module can be easily mounted in the module accommodating portion by inserting the protective circuit module through the open upper portion.

As a preferable example of physically insulating the module accommodating part from the space inside the pack case, the module accommodating part may have a structure in which a partition wall for separating the battery accommodating space is formed at a portion facing the battery cell.

In the above structure, the connection member for electrically connecting the battery cells to the protection circuit module may be a structure mounted in a state coupled to the partition wall.

In this case, terminal connection parts are formed on both front surfaces of the protection circuit module to connect connection members (electrode terminal connection members) respectively connected to the positive and negative terminals of the electrically connected battery cells. The protective circuit module is energized via the connection member and the terminal connection part.

In addition, a sensing connection part to which a connection member (detection signal connection member) for transmitting voltage and / or temperature detection signals of the battery cells may be further formed.

The connection member may have various shapes, and preferably, may have a flexible printed circuit board (FPCB) structure. For example, the circuit board may include an FPCB including an electrode terminal connection circuit and at least one detection signal transmission circuit. Only two connecting members for the electrode terminal are used for the positive electrode and the negative electrode. However, since the connecting member for the detection signal may be additionally required, a wire, a metal strip, or the like may additionally be used as the connecting member for the excess detection signal. .

In one preferred embodiment, the connection member of the FPCB structure has a terminal connected to the final positive or negative terminal of the battery cell for charging and discharging is formed at one end, the terminal for measuring the voltage of the connection between the battery cells Is formed at the other end, and a terminal for connecting the battery cell side connection terminals to the protection circuit module may be formed at the opposite end. In this structure, the battery cell side connection terminals and the protection circuit module side connection terminals are connected in a circuit.

Preferably, the protection circuit module side terminal may be bent in correspondence with the shape of the partition wall so as to be connected to the terminal connection portion of the protection circuit module via the upper end of the partition wall.

The connection of the connection member to the terminal connection portion of the protective circuit module is not particularly limited as long as it can be an electrical connection to each other, for example, may be performed by a mechanical fastening method, a soldering method, and the like, preferably in the soldering Can be performed by

On the other hand, the battery cell embedded in the pack case is a secondary battery capable of charging and discharging is not particularly limited in form and type thereof, but preferably may be a lithium secondary battery of cylindrical structure. Lithium secondary batteries are preferred because of their high energy density per unit weight and high discharge characteristics.

In the above structure, a plurality of cylindrical secondary batteries may be mounted in the pack case in parallel to both ends of the battery pack in one or two rows. That is, the cylindrical secondary batteries may be arranged to be parallel to both ends of the battery pack based on the longitudinal direction thereof.

The type of external device according to the present invention is not particularly limited as long as it includes a structure in which the battery pack as a power source is mounted, but may preferably be a notebook computer.

Accordingly, the present invention also provides a notebook computer including the battery pack as a power source. Since a notebook computer using a battery pack containing a plurality of secondary batteries is known in the art, detailed description thereof will be omitted herein.

The present invention also provides a method of manufacturing a battery pack having the above structure.

Specifically,

(a) mounting the battery cells in an electrically connected state inside the pack case, and coupling the upper case and the lower case with the ends of the connection members exposed in the direction of the module accommodating part;

(b) attaching a protection circuit module to the module accommodating portion of the pack case;

(c) bonding the end portions of the electrode terminal connecting members connected to the positive and negative terminals of the battery cells, respectively, by soldering to the terminal connecting portions of the protection circuit module; And

(d) sealing the module accommodating part by an accommodating part cover;

Can be made.

Therefore, the manufacturing method, as mentioned above, not only the safety is improved by the structural features of the battery pack, but also can minimize the increase in cost in the event of a failure in the manufacturing process of the battery pack, and the process is easy to automate, It is easy to adjust the supply amount according to the demand of the battery pack has a feature that can greatly improve the productivity.

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

3 is an exploded schematic view of a battery pack according to an embodiment of the present invention, Figure 4 shows a schematic diagram of the process of mounting the electrically connected battery cells and the upper case to the lower case.

Referring to these drawings, the battery pack 100 controls the overcharge, overdischarge and overcurrent of the pack case 200 and the cylindrical battery cells 500 in which the cylindrical battery cells 500 are electrically connected. Protruding on the outer surface of the protective circuit module 300, the module housing 230 formed on one outer surface of the pack case 200, the protective circuit module 300 to insert the protective circuit module 300 The socket type connection terminal part 240 formed in the shape and the protective circuit module 300 is inserted into the module accommodating portion 230 in a state in which the housing cover 400 for sealing the protection module It is.

The pack case 200 includes an upper case 210 and a lower case 220, and a pair of fastening holes 232 are formed at both ends of the lower end of the module accommodating part 230.

The module accommodating part 230 is formed on the lower case 220 in a structure in which the upper part is opened so that the protection circuit module 300 can be inserted from the upper part, and the cylindrical battery is located at the portion facing the cylindrical battery cell 500. A partition wall 234 is formed for physical isolation from the cell mounting space 222, and a slit groove 232 for mounting the protection circuit module 300 is formed in the length direction of the pack case 200 at the bottom of the inner surface. It is.

The socket type connection terminal part 240 is mounted to protrude outward from the module accommodating part 230, and the socket type connecting terminal 244 is connected to the connection terminal accommodating part 242 formed at one outer surface of the module accommodating part 230. ) Consists of an inserted structure.

In the accommodating part cover 400, an opening 402 is formed at a corresponding portion of the socket type connecting terminal part 240 so that the socket type connecting terminal part 240 can be exposed to the outside.

The protection circuit module 300 has a PCB structure, and terminal connection parts 310 and 330 are formed on both front surfaces thereof to connect the positive terminal connecting member 510 and the negative terminal connecting member 520. A sensing connection part 320 connected to the detection signal connection member 530 is formed between the connection parts 310 and 330.

The cylindrical battery cells 500 are electrically connected in a 2P-3S structure, and connecting members for electrode terminals respectively connected to positive and negative terminals of the battery cells 500 on both sides of the outer surface of the cylindrical battery cells 500. 510 and 520 are in close contact with each other, and a detection signal connecting member 530 for detecting the voltage and temperature of the battery cells 500 is in close contact between the electrode terminal connecting members 510 and 520.

The electrical series and parallel connection between the positive and negative terminals of the cylindrical battery cells 500 is elastically achieved by the connecting members 540 and 550 of the mechanical contact method, and thus does not require welding. Details of the connection members 540 and 550 are described in Korean Patent Application Nos. 2007-0053274, 2007-0066841, 2007-0066897, 2007-0070318, 2007-0103286, and the like. No. 2007-0103290, which is described in detail, these applications are incorporated herein by reference.

The electrode terminal connection members 510 and 520 have an FPCB structure, and the terminals 512 and 522 connected to the protection circuit module 300 are bent in correspondence with the shape of the partition wall 234 to form a partition wall ( It is easily connected to the terminal connection parts 310 and 330 of the protection circuit module 300 via the upper end of the 234.

More details related to this can be found in FIG. 5, in which a connection member for an electrode terminal according to an exemplary embodiment is illustrated.

Referring to FIG. 5, an electrode terminal connecting member 510 has an FPCB structure, and a terminal 511 connected to a final positive or negative terminal of a battery cell (not shown) is formed at one end thereof for charging and discharging. The terminal 513 for measuring the voltage at the connection between the battery cells is formed at the other end. In addition, terminals 512 and 514 connecting these terminals 511 and 513 to a protection circuit module (not shown) are formed at opposite ends, respectively. The battery cell side connection terminals 511 and 513 are connected in circuit, and the protection circuit module side connection terminals 512 and 514 are also connected in circuit.

The protective circuit module side terminals 512 and 514 are bent in correspondence with the shape of the partition wall so as to be connected to the terminal connection part (not shown) of the protection circuit module via an upper end of a partition wall (not shown) of the module accommodating portion. It is.

Thus, as shown in FIG. 4, the electrical connection of the electrode terminal connecting members 510, 520 to the terminal connections 310, 330 of the protection circuit module 300 is, for example, an automated soldering operation. Can be achieved by

FIG. 6 is a schematic diagram illustrating a process of mounting a protection circuit module to a module accommodating part of the pack case of FIG. 4, and FIG. 7 is a schematic diagram illustrating a process of sealing the accommodating part cover to the module accommodating part of FIG. 6. .

Referring to these drawings in conjunction with Figure 4, the method for manufacturing a battery pack according to the present invention, first, mounting the cylindrical battery cells 500 in an electrically connected state inside the pack case 200, and connected The upper case 210 and the lower case 220 are coupled with the terminals 512 and 522 of the member exposed in the direction of the module accommodating portion 230.

Next, the protective circuit module 300 is mounted on the module accommodating part 230 of the pack case 200, and the connection members 510 for electrode terminals connected to the positive and negative terminals of the cylindrical battery cells 500, respectively. The terminals 512 and 522 of the 520 are coupled to the terminal connections 310 and 330 of the protection circuit module 300 by soldering.

Finally, the battery pack assembly is covered by covering the module accommodating part 230 with the accommodating part cover 400 and inserting the screws 234 into the fastening through holes 232 formed at both ends of the lower end of the module accommodating part 230. Will complete.

As described above, the battery pack according to the present invention has a structure in which the protection circuit module is isolated from the battery cells built in the pack case, so that the electrolyte solution with high polarity when the electrolyte leaks inside the pack case is protected. By preventing contact of the circuit module, the safety of the battery pack can be greatly improved.

In addition, since the protection circuit module can be positioned in place, soldering automation can be easily achieved, and in the event of a battery pack failure, cost can be minimized by replacing the pack case or the protection circuit module in which the battery cell is built. It is easy to adjust the supply amount according to the demand of the battery pack.

Those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

FIG. 1 is a schematic diagram of a process of combining six cylindrical secondary batteries by an electrical connection method of 2P (Parallel)-3S (Serial);

FIG. 2 is a schematic view of a core pack manufactured by electrically connecting cylindrical secondary batteries in FIG. 1; FIG.

3 is an exploded schematic view of a battery pack according to an embodiment of the present invention;

4 is a schematic diagram of a process of mounting the electrically connected battery cells and the upper case to the lower case;

5 is a schematic diagram of a connection member for an electrode terminal according to an embodiment used in the battery pack of the present invention;

FIG. 6 is a schematic diagram of a process of mounting a protection circuit module to a module accommodating portion of the pack case of FIG. 4; FIG.

FIG. 7 is a schematic view of a process of sealing an accommodating part cover to the module accommodating part of FIG. 6.

Claims (24)

A battery pack embedded in a pack case in which two or more battery cells are electrically connected, the battery pack including a protection circuit module for controlling overcharge, overdischarge, and overcurrent of the battery cells, wherein the pack case includes an upper case And a lower case, wherein the protection circuit module is electrically connected in a state of being physically isolated from the battery cells, and is configured to be mounted on a module accommodating part formed at one outer surface of the pack case. The pack case is a battery pack, characterized in that the protective circuit module is further included a cover (sealing unit cover) for sealing the protective circuit module in the state inserted into the module housing. delete The battery pack as claimed in claim 1, wherein the accommodating part cover is coupled to the pack case by a mechanical fastening method. The method of claim 3, wherein the accommodating cover and the pack case or module accommodating portion corresponding to the accommodating part cover have a structure in which at least one fastening through hole is in communication with each other, and a screw is inserted into the fastening through hole for mechanical fastening. Battery pack characterized in that to form. The battery pack as claimed in claim 1, wherein a socket type connection terminal for electrically connecting the protection circuit module to an external device is located at one outer surface of the module accommodating part. 6. The battery pack according to claim 5, wherein the socket-type connection terminal is formed on a protection circuit module, and an opening is formed in an accommodating cover so that the socket-type connection terminal is exposed to the outside. The battery pack as claimed in claim 1, wherein the protection circuit module has a printed circuit board (PCB) structure. The battery pack according to claim 1, wherein a slit groove for mounting the protection circuit module to the module accommodating portion is formed at the lower end of the inner surface in the longitudinal direction of the pack case. The battery pack as claimed in claim 1, wherein the module accommodating portion is formed on the lower case in an upper open structure. The method of claim 1, wherein in order to physically isolate the module housing from the inner space of the pack case, the module housing is formed in the portion facing the battery cell partition wall for isolation from the battery cell mounting space, characterized in that Battery pack. The battery pack as claimed in claim 10, wherein a connection member electrically connecting the battery cells to the protection circuit module is mounted to the barrier rib. 12. The terminal of claim 11, wherein terminal connection parts are formed on upper surfaces of both sides of the protection circuit module to connect connection members (electrode terminal connection members) respectively connected to the positive and negative terminals of the electrically connected battery cells. Battery pack to say. The sensing connection according to claim 12, wherein a connection member (connection member for detection signal) for transmitting (i) a voltage detection signal, or (ii) a temperature detection signal, or (iii) a voltage and temperature detection signal of the battery cells is connected. The battery pack characterized in that the additional portion is formed. The battery pack as claimed in claim 12, wherein the connection member has a flexible printed circuit board (FPCB) structure. 15. The battery pack as claimed in claim 14, wherein the FPCB includes an electrode terminal connection circuit and at least one detection signal transmission circuit. The terminal of claim 15, wherein the FPCB has a terminal connected to the final positive or negative terminal of the battery cell for charging and discharging at one end thereof, and a terminal for measuring the voltage at the connection part between the battery cells is provided at the other end thereof. And a terminal for connecting the battery cell side connection terminals to the protection circuit module, the terminal having a structure formed at an opposite end portion thereof. The battery pack according to claim 16, wherein the protection circuit module side terminal is bent in correspondence with the shape of the partition wall so as to be connected to the terminal connection portion of the protection circuit module via an upper end of the partition wall. 18. The battery pack according to claim 17, wherein the connection of the connection member to the terminal connection portion of the protection circuit module is performed by soldering. The battery pack according to claim 1, wherein the battery cell embedded in the pack case is a lithium secondary battery having a cylindrical structure. 20. The battery pack as claimed in claim 19, wherein a plurality of cylindrical secondary batteries are arranged in the pack case in parallel to both ends of the battery pack in one or two rows. Notebook computer characterized in that the battery pack according to claim 1 is mounted. As a method of manufacturing a battery pack according to claim 1, (a) mounting the battery cells in an electrically connected state inside the pack case, and coupling the upper case and the lower case with the ends of the connection members exposed in the direction of the module accommodating part; (b) attaching a protection circuit module to the module accommodating portion of the pack case; (c) bonding the terminals of the connection member for electrode terminals connected to the positive and negative terminals of the battery cells, respectively, by soldering to the terminal connection portions of the protection circuit module; And (d) sealing the module accommodating part by an accommodating part cover; Battery pack manufacturing method comprising a. A battery pack embedded in a pack case in which two or more battery cells are electrically connected, the battery pack including a protection circuit module for controlling overcharge, overdischarge, and overcurrent of the battery cells, wherein the pack case includes an upper case And a lower case, wherein the protection circuit module is electrically connected in a state in which the protection circuit module is physically isolated from the battery cells, and is mounted on a module accommodating part formed at one outer surface of the pack case. The battery pack characterized in that the upper portion is formed on the lower case in an open structure. A battery pack embedded in a pack case in which two or more battery cells are electrically connected, the battery pack including a protection circuit module for controlling overcharge, overdischarge, and overcurrent of the battery cells, wherein the pack case includes an upper case And a lower case, wherein the protection circuit module is electrically connected in a state in which the protection circuit module is physically isolated from the battery cells, and is mounted on a module accommodating portion formed at one outer surface of the pack case. In order to physically isolate from the inner space of the pack case, the module accommodating portion is a battery pack, characterized in that a partition for separating the battery cell mounting space is formed in a portion facing the battery cell.

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