KR101132155B1 - Large Capacity Battery Pack of Novel Structure - Google Patents

Abstract

The present invention provides a battery cell stack in which an electrode assembly having a cathode / separation membrane / cathode structure is stacked in a number of two or more battery cells sealed in an interior of a battery case together with an electrolyte; An insulating mounting member including an frame body made of an insulating material mounted on an upper surface of the battery cell stack, and connecting members connecting the battery cells in parallel or in series and simultaneously electrically connected to the following protection circuit module (PCM); A protection circuit module (PCM) mounted on the insulating mounting member and including a protection circuit for controlling the operation of the battery pack; A spacer coupled to the mutually facing portions of the battery cells while providing a space for accommodating a volume change due to the charge and discharge of the battery cells; And it provides a battery pack comprising an insulating cap coupled to the upper end of the battery cell stack while wrapping the insulating mounting member in the PCM mounted state.

Description

Large Capacity Battery Pack of Novel Structure

The present invention relates to a large capacity battery pack having a novel structure, and more particularly, a battery cell stack in which two or more battery cells are stacked, and a connection member connecting the battery cells and electrically connected to the protection circuit module at the same time. An insulating mounting member including, a protective circuit module (PCM) including a protective circuit for controlling the operation of the battery pack, a spacer coupled to the mutually facing portions of the battery cells, and wrap the insulating mounting member in the state where the PCM is mounted And it relates to a battery pack comprising an insulating cap coupled to the upper end of the battery cell stack.

With the development of technology and increasing demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries with high energy density, high operating voltage, and excellent storage and life characteristics are used for various mobile devices as well as various electronic products. It is widely used as an energy source.

However, since lithium secondary batteries contain various combustible materials, there is a risk of overheating, explosion, etc. due to overcharging, overcurrent, and other physical external shocks, and thus has great disadvantages in safety. Therefore, a lithium secondary battery has a PTC (Positive Temperature Coefficient) element and a protection circuit module (PCM) connected to the battery cell as a safety device that can effectively control abnormal conditions such as overcharge and overcurrent. It is mounted.

In general, PCM is connected to the battery cell by welding or soldering via a conductive nickel plate. That is, the battery pack is manufactured by connecting the PCM to the battery cell by welding or soldering a nickel plate to the electrode tab of the PCM, and then welding or soldering the nickel plate to the electrode terminal of the battery cell, respectively.

These safety devices, including PCM, must maintain electrical connection with the electrode terminals while maintaining electrical isolation from other parts of the battery cell. Since a plurality of insulating mounting members or a plurality of components are required to configure such a connection form, the assembly process of the battery pack is complicated and the space for accommodating the battery cells is relatively reduced.

In addition, a plurality of welding or soldering is required in order to configure the battery pack, such welding, etc., because the small structure of the secondary battery has to be carried out in a very precise work, there is a high probability of failure. Moreover, the addition of such a process during the manufacturing process of the product acts as a factor that increases the product cost.

Therefore, there is an urgent need for a structure capable of minimizing the number of welding or soldering in the process of electrically connecting the PCM and the conductive nickel plate, or a structure capable of achieving electrical connection by a method other than welding or soldering.

On the other hand, according to the needs of consumers who want to use a mobile device for a long time, the battery cell mounted on the mobile device also requires high output and large capacity. However, in order to newly develop such a large capacity battery cell, there is a problem in that development cost and manufacturing cost are high.

Therefore, while increasing the capacity using a conventional battery cell, at the same time to reduce the number of parts mounted on the battery pack to simplify the assembly process, and to minimize the welding while stably joining the members mounted on the top of the battery cell mutually There is a high need for technology.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.

Specifically, it is an object of the present invention to provide a battery pack having improved structural stability, including two or more existing battery cells to exhibit high output or high capacity characteristics.

Still another object of the present invention is to provide a battery pack having a large capacity, which can be manufactured by a simple and easy method and can reduce manufacturing costs by reducing the number of parts.

Battery pack according to the present invention for achieving this object,

(a) a battery cell stack in which two or more battery cells in which an electrode assembly having a cathode / separation membrane / cathode structure are sealed together with an electrolyte in a battery case are stacked;

(b) an insulating material including a frame body made of an insulating material mounted on an upper surface of the battery cell stack, and connecting members connecting the battery cells in parallel or in series and at the same time electrically connected to the following protection circuit module (PCM); Mounting member;

(c) a protection circuit module (PCM) mounted on the insulating mounting member and including a protection circuit for controlling the operation of the battery pack;

(d) a spacer coupled to the mutually facing portions of the battery cells while providing a space for accommodating a volume change caused by charging and discharging of the battery cells; And

(e) an insulating cap coupled to the upper end of the battery cell stack while surrounding the insulating mounting member in the state where the PCM is mounted;

It is configured to include.

That is, the battery pack according to the present invention, by stacking the existing battery cells in the state with a spacer interposed according to the desired battery pack capacity, by connecting the battery cells in parallel or in series using a connecting member, a large capacity or The battery pack of high output can be easily manufactured by a simple manufacturing method.

For example, when a battery pack is composed of three battery cells, three battery cells are successively stacked in such a manner that two spacers are interposed between the battery cells, and an insulating mounting member, a PCM, and an insulating cap are disposed. The battery pack may be sequentially mounted on top of the battery cell stack to manufacture a desired battery pack.

In addition, in the case of a battery pack requiring high power, the electrode terminals of the battery cell stack are electrically connected in series, and in the case of the battery pack requiring long time use, the desired battery pack is required by electrically connecting the electrode terminals of the battery cell stack. It can be prepared selectively depending on the use and.

Furthermore, since the battery pack according to the present invention has a structure in which spacers are mounted at portions where the battery cells face each other, the battery pack can be suitably accommodated to the volume change due to charging and discharging of the battery cells and firmly coupled to the battery cells. This can further improve the structural stability of the battery pack.

As described above, the battery cell stack may be configured by stacking a plurality of battery cells according to a desired capacity of a battery pack. For example, the battery cell stack may be used for a long time while considering the convenience of portable. It is preferable that the two battery cells.

The battery cells can be selected in series or parallel connection according to the desired output and capacity of the device on which the battery pack of the present invention is mounted. For example, when a large capacity is required for a long time use, the electrical connection of the battery cells may be a parallel connection, and the parallel connection is a predetermined connection in which the battery cells are stacked in the same orientation such that the same electrode terminals are adjacent to each other. This can be achieved by simply connecting with a member.

The spacer is not particularly limited as long as the spacer is interposed between the battery cells and provides a space capable of interconnecting the battery cells and accommodating a volume change due to charge and discharge. Preferably, the spacers of the battery cells face each other. It may be made in a frame shape corresponding to the outer peripheral surface portion.

Since the spacer having a frame shape provides a structure for supporting the outer circumferential surfaces of the battery cells facing each other in a state where the center portion is empty, it is preferable to accommodate a volume change such as expansion or contraction due to charging and discharging of the battery cells. . That is, since the portion where the volume change of expansion or contraction is greatest during the charging and discharging process is located at both sides of the battery cell center, the spacer supporting the outer circumferential surface of the battery cells has a space capable of effectively accommodating the volume change. to provide.

In the structure of the spacer having a frame shape, both end portions of the spacer may have a wedge shape in a vertical cross-section corresponding to the outer circumferential surface of the curved battery cell. Such a structure can fix the spacers in the state in which they are in close contact with the spacers in close contact with both sides of the battery cells, and can effectively prevent the battery cells from escaping from the position when the external force is applied.

In another preferred embodiment, the spacer may be made of a structure that is integrally formed with the bottom cap is coupled to the lower end of the battery cell stack, such an integrated structure can simplify the assembly structure and assembly process of the battery pack.

Preferably, the upper and lower surfaces of the spacer contacting the outer circumferential surfaces of the battery cells are coated with an adhesive for bonding to the battery cells to a predetermined thickness, or a double-sided adhesive tape is attached, so that the spacer and the battery cells are bonded to each other. Can be made more robust.

The coupling of the insulating mounting member to the top surface of the battery cell stack is automatically achieved in the process of connecting the connecting members of the insulating mounting member to the electrode terminals of the battery cell, but the battery pack assembly process and the more stable coupling state In order to ensure that, for example, it may be combined separately by a bonding (Bonding) method.

The connection member may be formed of conductive plates coupled to the battery cell electrode terminal by welding. For example, the connecting member may be formed of a metal plate such as nickel, and the metal plate electrically connects the battery cell electrode terminal and the protection circuit module, and the electrical connection may include a through hole for connection on the insulating mounting member. Through preferably welding. Examples of the welding include laser welding, resistance welding and the like.

The method of connecting the conductive plate and the protection circuit module of the connection member may be various, for example, a method of fixing by welding or soldering, or a separate fastening to the terminals of the protection circuit module and the connection member in contact with each other. Or a method of mounting a member or forming a corresponding portion in a fastening structure and fastening it mechanically.

In one preferred example, one end of the conductive plate has a connecting projection protruding upward, and both ends of the protective circuit module is formed with connection grooves are inserted and coupled to the connecting projection is connected to the protective circuit It may be made of a structure.

Accordingly, the structure of the conductive plate and the protective circuit module is preferable because the protective circuit module and the conductive plate can be electrically connected by inserting the connection protrusion of the conductive plate into the connection groove of the protective circuit module without a separate welding operation.

The structure in which the frame body and the conductive plates of the insulating mounting member are coupled may be achieved through various methods. For example, mechanical fastening, attachment, molding, or the like may be used.

As one example of such a coupling structure, grooves are formed at both ends of the frame body of the insulating mounting member, and protrusions corresponding to the grooves are formed on one lower surface of one end of the conductive plates, thereby coupling the grooves and the protrusions. The structure by which the electroconductive plate is couple | bonded with the frame main body is mentioned.

As another example, the conductive plate may have a structure in which at least a portion thereof is coupled to be embedded in the frame body. For example, the structure in which a part of the conductive plate is embedded in the frame main body can form the frame main body by insert injection molding, and at the same time can manufacture the conductive plate, thereby reducing the number of manufacturing steps.

A PTC device may be connected to at least one of the conductive plates in order to improve safety due to overheating of the battery cell stack. The PTC element is a kind of safety element that energizes the current by decreasing the resistance when the temperature of the battery cell stack rises, the resistance greatly increases, and conversely, when the temperature decreases. The PTC element is positioned on a connection circuit between the electrode terminals of the battery cell stack and the PCM, and thus can effectively perform the power disconnection and energization functions according to the temperature of the battery cell stack.

The conductive plates may be formed of a first conductive plate coupled to the negative terminal of the battery cell stack and a second conductive plate coupled to the positive terminal of the battery cell laminate. For example, in this structure, the negative terminals of the battery cells may be electrically connected to each other in parallel by the first conductive plate, and the positive terminals of the battery cells may be electrically connected to each other in parallel by the second conductive plate.

Meanwhile, the insulating mounting member may have a structure in which through holes through which protruding terminals of the battery cell stack are inserted may be formed at the center thereof.

Specifically, through holes are formed in the center of the insulating mounting member, and a conductive plate is positioned in the through hole, and a protruding terminal (eg, a negative electrode terminal) of the battery cell stack is inserted into the through hole. In contact with a portion of the conductive plate, it can be made of a structure for joining the contacted portion by welding.

In addition, this structure allows the battery cell and the PCM to be electrically insulated by the insulating mounting member when the connecting member is installed between the battery cell and the PCM, except for a specific portion of the connecting member, that is, a part of the conductive plate. To help.

In some cases, the PCM may be formed integrally with the insulative cap by insert injection molding, such an integral structure is disclosed in detail in Korean Patent Application No. 2003-88528 of the applicant, which application is incorporated by reference. Incorporates the teachings of the present invention.

The PCM may be configured to be mounted on the top of one side of the insulating mounting member. For example, when connecting the battery cells of the battery cell stack in parallel, each electrode terminal is connected to the same electrode in parallel, so the PCM is mounted only on the top of one battery cell without the need to install a PCM in each of the battery cells can do. Therefore, such a structure is highly desirable because it can reduce the volume of the battery pack and reduce the manufacturing cost.

Since the battery case of the battery cell is required for ease of processing and a certain level or more of mechanical strength, the battery case may be a metal can, and preferably, an aluminum can or a stainless steel can.

The insulative cap serves to protect the battery cell stack from external shocks and to maintain mechanical insulation while compensating for the mechanical strength of the members mounted on the top of the battery cell stack.

Preferably, the insulating cap is of a predetermined length so that at least a portion thereof can surround the outer surface of the upper end of the battery cell stack in order to improve the bonding force to the battery cell stack. It may be a structure extended downward.

In order to maximize this effect, the downward extension of the insulating cap is preferably a structure that is coupled to the outer surface of the upper end of the battery cell stack by an adhesive method or a mechanical fastening method.

An outer film may be attached to an outer surface of the battery cell stack, thereby protecting the battery cell stack from external shock and maintaining an electrical insulation state. Preferably, the exterior film may be attached to the structure surrounding the downward extension of the insulating cap.

The battery pack according to the present invention may be variously applied regardless of the type and appearance of the battery cell, and may be preferably applied to a battery pack including a rectangular lithium secondary battery as a battery cell.

The present invention can also provide a portable electronic device in which the battery pack is mounted. Preferred examples of such portable electronic devices include, but are not limited to, mobile phones, PDAs, digital cameras, portable navigators, portable game machines, and the like.

However, since the battery pack can be easily manufactured to provide a desired output and capacity by varying the number of battery cells, the device can be easily applied to not only portable electronic devices but also various devices requiring variable battery capacity. Of course it can.

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

1 is a perspective view schematically showing a battery pack according to an embodiment of the present invention, Figure 2 is an exploded perspective view of Figure 1 schematically, Figure 3 is a battery cell including a spacer A perspective view of the laminate is schematically shown.

Referring to these drawings, the battery pack 100 is an abnormality such as a battery cell stack 250, overcharge, etc., in which two battery cells 200 in which an electrode assembly is sealed inside an battery case together with an electrolyte solution are stacked. PCM 300 to effectively control the phosphorus state, the PCM (300) is mounted on the top and the insulating mounting member 400, which is mounted on the top surface of the battery cell stack 250, the insulation in the PCM (300) is mounted The insulating cap 500 coupled to the upper end of the battery cell stack 250 while surrounding the mounting member 400, the lower cap 510 coupled to the lower end of the battery cell stack 250, and the battery cell stack ( The outer film 520 wraps around and is attached to the outer surface of the 250, and consists of a structure including a spacer 600 coupled to mutually facing portions of the battery cells 200.

The double-sided adhesive tape 630 is attached to the upper and lower surfaces of the spacer 600 to couple the spacer 600 and the battery cells 200.

The upper surface 210 of the battery cell stack 250 is formed with a negative electrode terminal 220 protruding upward in an insulated state from the battery case 240, the remaining portion except for the negative electrode terminal 220 Form the positive terminal. Nickel cladding 225 is attached to the anode terminals, and the electrolyte injection portion 230 sealed by the metal ball, the polymer resin, or the like protrudes in a planar circular shape on the opposite side.

The insulating mounting member 400 is coupled to the top surface 210 of the battery cell stack 250 in an adhesive manner, and the insulating cap 500 is in a state where the PCM 300 is mounted on the insulating mounting member 400. It is coupled to the upper end of the battery cell stack 250 while wrapping the insulating mounting member 400, and extends downward to a predetermined length so as to cover the outer surface of the upper end of the battery cell stack 250. An A / S label 502 is attached.

The outer surface of the battery cell stack 250 is attached with an outer film 520 to ensure electrical insulation with the outside and to display product information. The outer film 520 made of a heat-shrinkable material is manufactured in the form of a tube, and is wrapped in an outer surface of the battery cell stack 250 and then applied to heat so that the outer film 520 shrinks and adheres to the surface of the battery cell stack 250. However, of course, other structures of the exterior film can also be used.

FIG. 4 is an enlarged view of the insulating mounting member of FIG. 2 schematically, FIG. 5 is a schematic perspective view of FIG. 4, and FIG. 6 is an enlarged view of the PCM of FIG. Is shown.

2 and 3, the insulating mounting member 400 may parallel the battery body 200 and the frame body 410 of an insulating material mounted on the top surface of the battery cell stack 250. And conductive plates 420 and 450 that are electrically connected to and electrically connected to the PCM 300 at the same time.

The conductive plates 420 and 450 may be a first conductive plate 420 electrically connected to the negative electrode terminals 220 of the battery cell stack 250 by welding, and the positive electrode terminals of the battery cell stack 250. The second cladding plate 450 is electrically connected to the nickel clad 225 by welding.

In addition, a part of the first conductive plate 420 and the second conductive plate 450 is embedded in the frame main body 410 by insert injection molding, and the second conductive plate 450 is in accordance with the temperature of the battery cell. PTC elements 440 that perform disconnection and energization functions are connected.

Through holes 430 are formed in the center of the insulating mounting member 400, and the first conductive plate 420 is positioned in the through holes 430. The negative electrode terminals 220 of the battery cell stack 250 are respectively inserted into the through holes 430 to be in contact with a portion of the first conductive plate 420, and the contacted portion is disposed on the upper portion of the insulating mounting member 400. By welding through the through holes 430, the negative electrode terminals 220 and the first conductive plate 420 of the battery cell stack 250 are electrically connected to each other.

A second conductive plate 450 is positioned at a portion corresponding to the nickel clads 225 of the battery cell stack 250, and one end portions of the second conductive plate 450 and the nickel clads 225 are insulative. It is electrically connected to each other by welding through an opening from the top of the mounting member 400.

Connection protrusions 422 protrude upward from one end of each of the first conductive plate 420 and the second conductive plate 450. At both ends of the PCM 300, the connecting protrusions 422 are inserted into and coupled to and protected at positions corresponding to the connecting protrusions 422 of the first conductive plate 420 and the second conductive plate 450. A connection groove 322 is connected to a circuit (not shown).

Accordingly, the connecting protrusions 422 of the first conductive plate 420 and the second conductive plate 450 are inserted into the connecting grooves 322 of the PCM 300, thereby providing a negative electrode of the battery cell stack 250. The terminals 220, the first conductive plate 420, and the PCM 300 are electrically connected to each other, and the nickel clads 225, the second conductive plate 450, and the PCM of the battery cell stack 250 are connected to each other. 300 is composed of a structure that is electrically connected to each other.

In addition, the electrode terminals 220 and 225 of the battery cell stack 250 are electrically connected in parallel to each other by the first conductive plate 420 and the second conductive plate 450, respectively, in which the same electrodes are connected. Due to the structure, the PCM 300 may be mounted only on one side upper end of the insulating mounting member 400.

7 is an enlarged view schematically illustrating the spacer of FIG. 2.

Referring to FIG. 7 together with FIG. 2, the spacer 600 has a shape corresponding to an outer circumferential portion of the battery cells 200 facing each other, and both ends of the spacer 600 are curved battery cells ( Corresponding to the outer circumferential surface of the (200) is formed in a wedge shape 610 in a vertical cross-section.

In addition, the spacer 600 is formed in a frame structure in which a central portion 620 is opened to accommodate a volume change caused by charging and discharging of the battery cell 200.

8 is an enlarged view schematically showing a spacer according to another embodiment of the present invention.

Referring to FIG. 8 together with FIG. 2, the spacer 600a is integrally formed with the lower cap 510 coupled to the lower end of the battery cell stack, thereby reducing the number of assembly processes of the battery pack 100.

As described above, the battery pack according to the present invention, by stacking the existing battery cells via a spacer, and connecting the respective electrode terminals in parallel or in series, a battery pack of the desired large capacity or high output is required It can be manufactured simply and easily.

In addition, when connecting the battery cells of the battery cell stack in parallel, it is possible to manufacture a battery pack by mounting only one PCM without mounting each PCM in the battery cells, thereby reducing the number of parts, which is the Significant savings in volume and manufacturing costs can be achieved.

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.

1 is a perspective view of a battery pack according to an embodiment of the present invention;

2 is an exploded perspective view of FIG. 1;

3 is a perspective view of a battery cell stack including spacers;

4 is an enlarged view of the insulating mounting member of FIG. 2;

5 is a top perspective view of FIG. 4;

6 is an enlarged view of the PCM of FIG. 2;

7 is an enlarged view of the spacer of FIG. 2;

8 is an enlarged view of a spacer according to another embodiment of the present invention.

Claims (25)

(a) a battery cell stack in which two or more battery cells in which an electrode assembly having a cathode / separation membrane / cathode structure are sealed together with an electrolyte in a battery case are stacked; (b) an insulating material including a frame body made of an insulating material mounted on an upper surface of the battery cell stack, and connecting members connecting the battery cells in parallel or in series and at the same time electrically connected to the following protection circuit module (PCM); Mounting member; (c) a protection circuit module (PCM) mounted on the insulating mounting member and including a protection circuit for controlling the operation of the battery pack; (d) a spacer coupled to the mutually facing portions of the battery cells while providing a space for accommodating a volume change caused by charging and discharging of the battery cells; And (e) an insulating cap coupled to the upper end of the battery cell stack while surrounding the insulating mounting member in the state where the PCM is mounted; Wherein the insulating cap is configured to extend downward in a predetermined length so that at least a portion thereof covers the outer surface of the upper end of the battery cell stack in a state where the insulating cap is mounted on the battery cell stack. . The battery pack as claimed in claim 1, wherein the battery cell stack is composed of two battery cells. The battery pack as claimed in claim 1, wherein the electrical connection of the battery cells is a parallel connection. The battery pack as claimed in claim 1, wherein the spacers have a frame shape corresponding to portions of outer circumferential surfaces of battery cells facing each other. The battery pack according to claim 4, wherein both ends of the spacer have a wedge shape in a vertical cross section corresponding to an outer circumferential surface of a curved battery cell. The battery pack as claimed in claim 4, wherein the spacer is integrally formed with a lower cap coupled to a lower end of the battery cell stack. The battery pack as claimed in claim 4, wherein an adhesive for bonding the battery cells is coated on the upper and lower surfaces of the spacer to a predetermined thickness, or a double-sided adhesive tape is attached. The method of claim 1, wherein the bonding of the insulating mounting member to the top surface of the battery cell stack is a battery pack, characterized in that achieved by the bonding (Bonding) method. The battery pack as claimed in claim 1, wherein the connection member comprises conductive plates coupled to the battery cell electrode terminals by welding. 10. The method of claim 9, wherein one end of the conductive plate has a connecting projection protruding upward, both ends of the protective circuit module, the connecting projection is inserted and coupled to the connection grooves are formed are connected to the protective circuit is formed There is a battery pack characterized in that. 10. The method of claim 9, wherein grooves are formed at both end portions of the frame body of the insulating mounting member, and projections corresponding to the grooves are formed on the lower surface of one end of the conductive plates, so that the frame is joined by the grooves. Battery pack characterized in that the coupling of the conductive plate to the body. The battery pack as claimed in claim 9, wherein at least a portion of the conductive plates is coupled to the frame body. The battery pack as claimed in claim 9, wherein a PTC device is connected to at least one of the conductive plates. The battery pack as claimed in claim 9, wherein the conductive plates are formed of a first conductive plate coupled to a negative terminal of the battery cell stack and a second conductive plate coupled to a positive terminal of the battery cell stack. The battery pack as claimed in claim 1, wherein the insulating mounting member has through holes through which protruding terminals of the battery cell stack can be inserted. The battery pack according to claim 1, wherein the PCM is formed integrally with the insulating cap by insert injection molding. The battery pack as claimed in claim 1, wherein the PCM is mounted at an upper end of an insulating mounting member. The battery pack as claimed in claim 1, wherein the battery case is a metal can. delete The battery pack according to claim 1, wherein an outer film is attached to an outer surface of the battery cell stack. The battery pack as claimed in claim 1, wherein the battery cell is a rectangular lithium secondary battery. A portable electronic device characterized in that the battery pack according to claim 1 is mounted. (a) a battery cell stack in which two or more battery cells in which an electrode assembly having a cathode / separation membrane / cathode structure are sealed together with an electrolyte in a battery case are stacked; (b) an insulating material including a frame body made of an insulating material mounted on an upper surface of the battery cell stack, and connecting members connecting the battery cells in parallel or in series and at the same time electrically connected to the following protection circuit module (PCM); Mounting member; (c) a protection circuit module (PCM) mounted on the insulating mounting member and including a protection circuit for controlling the operation of the battery pack; (d) a spacer coupled to the mutually facing portions of the battery cells while providing a space for accommodating a volume change caused by charging and discharging of the battery cells; And (e) an insulating cap coupled to the upper end of the battery cell stack while surrounding the insulating mounting member in the state where the PCM is mounted; It includes, the spacer has a frame shape corresponding to the outer peripheral surface portion of the battery cells facing each other, the upper and lower surfaces of the spacer is coated with an adhesive for bonding the battery cells to a predetermined thickness, or A battery pack, characterized in that the double-sided adhesive tape is attached. (a) a battery cell stack in which two or more battery cells in which an electrode assembly having a cathode / separation membrane / cathode structure are sealed together with an electrolyte in a battery case are stacked; (b) an insulating material including a frame body made of an insulating material mounted on an upper surface of the battery cell stack, and connecting members connecting the battery cells in parallel or in series and at the same time electrically connected to the following protection circuit module (PCM); Mounting member; (c) a protection circuit module (PCM) mounted on the insulating mounting member and including a protection circuit for controlling the operation of the battery pack; (d) a spacer coupled to the mutually facing portions of the battery cells while providing a space for accommodating a volume change caused by charging and discharging of the battery cells; And (e) an insulating cap coupled to the upper end of the battery cell stack while surrounding the insulating mounting member in the state where the PCM is mounted; The connection member includes a conductive plate coupled to the battery cell electrode terminal by a welding method, wherein the conductive plate is at least a portion of the battery pack, characterized in that coupled to the form embedded in the frame body. (a) a battery cell stack in which two or more battery cells in which an electrode assembly having a cathode / separation membrane / cathode structure are sealed together with an electrolyte in a battery case are stacked; (b) an insulating material including a frame body made of an insulating material mounted on an upper surface of the battery cell stack, and connecting members connecting the battery cells in parallel or in series and at the same time electrically connected to the following protection circuit module (PCM); Mounting member; (c) a protection circuit module (PCM) mounted on the insulating mounting member and including a protection circuit for controlling the operation of the battery pack; (d) a spacer coupled to the mutually facing portions of the battery cells while providing a space for accommodating a volume change caused by charging and discharging of the battery cells; And (e) an insulating cap coupled to the upper end of the battery cell stack while surrounding the insulating mounting member in the state where the PCM is mounted; And an insulating mounting member, through-holes through which protruding terminals of the battery cell stack are inserted, are formed in the center thereof.

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