KR20090064031A - Assembling-typed pcm and battery pack employed with the same - Google Patents

Abstract

An assembling-typed PCM is provided to increase adhesion between a protection circuit module and a battery cell and to utilize an internal space of a battery pack without welding or soldering process. A rectangular assembling-typed PCM(protection circuit module)(100) comprises a protection circuit controlling the overcharging, overdischarging and overcurrent of the battery cell. A first connection element(200) of a plate-like conductive material and a second connection element(300) of a plate-like conductive material is electrically connected to a protection circuit of protection circuit module. The first connection element is connected to the first electrode terminal of the battery cell and the second connection element is connected to the second electrode terminal of the battery cell.

Description

Assembly protection circuit module and battery pack including same {Assembling-typed PCM and Battery Pack Employed with the Same}

The present invention relates to a prefabricated protective circuit module, and more particularly, a rectangular protective circuit module including a protection circuit for controlling overcharging, overdischarging, and overcurrent of a battery cell, which is connected to a first electrode terminal of the battery cell. The second connection member connected to the first connection member and the second electrode terminal is coupled to the lower surface in an electrically connected state to the protection circuit of the PCM, and the second connection is electrically insulated from the center of the first connection member. A through hole through which the member can be formed is formed, and both end portions of the first connection member are bent downward inward to be fastened while being elastically wrapped on both sides of the battery cell. Provided is a battery cell protection circuit module configured to be achieved.

Due to 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 not only various mobile devices but also various electronic products. It is widely used as an energy source.

However, the lithium secondary battery contains various combustible materials, and there is a danger of overheating or explosion due to overcharging, overcurrent, other physical external impact, etc., and thus has a serious safety drawback. Therefore, in the lithium secondary battery, a protection circuit module (PCM) capable of effectively controlling abnormal conditions such as overcharging is embedded in a state connected to the battery cell.

PCM is composed of field effect transistor (FET) as a switching element to control current, and passive elements such as voltage detector, resistor and capacitor, and overcharge, overdischarge, overcurrent, short circuit, reverse voltage of battery By preventing the explosion, overheating or leakage of the battery and deterioration of the charge / discharge characteristics, and by suppressing the degradation of the electrical performance and physicochemical abnormal behavior, the risk factor is eliminated and the service life is extended.

In general, PCM is connected to the battery cell by a strong welding or soldering method using a conductive material such as a plate. However, the welding or soldering method has a disadvantage of requiring a high-technical work and a large working space. In addition, when a physical shock is applied to the battery cell, it may cause an electrical short, etc., may cause a safety problem such as fire and explosion.

In this regard, Figure 1 is a schematic diagram of the assembly process for electrically connecting the PCM to the battery cell in a conventional lithium secondary battery.

Referring to FIG. 1, the battery cell 1 includes a protruding electrode terminal 1a (herein, set as a cathode terminal) of a cathode or an anode on an upper surface thereof, and an anode whose outer surface of the battery case is another electrode. Alternatively, a negative electrode terminal (here, set as a positive electrode terminal) is formed. Two electrode leads 2 and 3 are used for electrical connection between the battery cell 1 and the PCM 4. First, the positive lead 2 is welded to the upper surface of the battery cell 1 and the positive electrode tab (not shown) at the bottom of the PCM 4, respectively, and the negative lead 3 is connected to the negative terminal of the battery cell 1 ( 1a) and a negative electrode tab (not shown) at the bottom of the PCM 4, respectively. Insulating paper 5 is interposed therein to prevent an electrical short from occurring due to other parts of the negative electrode terminal 3 connected to the negative electrode tabs contacting the PCM 4.

This electrical connection requires several welding operations. That is, the work of welding the respective electrode leads (2, 3) to the electrode terminal of the battery cell 1 and the work again to the electrode tab of the PCM (4) is required. Moreover, due to the small size and light weight tendency of secondary batteries, the components of the batteries are becoming smaller, so welding small components (eg, electrode leads, electrode tabs, etc.) requires skilled techniques or precision devices are used. This makes the assembly process complex and time consuming. For this reason, the possibility of defects also increases. Furthermore, in order to weld the electrode leads 2 and 3 fixed to the battery cell 1 again by welding to the electrode tabs at the bottom of the PCM 4, a battery cap (not shown) can be accessed from the side. A groove is formed on the side of the blade), which is used as an inflow passage for foreign material (water, etc.), causing malfunction or failure.

Accordingly, researches on various techniques of the non-welding method, which can compensate for the disadvantages while maintaining the advantages of the welding or soldering method, are being actively conducted. For example, Korean Patent Application Publication No. 2004-0015314 discloses a PCB substrate including a protective circuit portion and a protruding contact portion, which is bonded to a fixing portion of plastic material manufactured by injection molding using the protruding contact portion, and then a battery. By mounting the fixing part in a cell, a structure for mounting a protection circuit in a battery cell is disclosed. Korean Patent Application Laid-Open No. 2005-0074197 encloses a circuit board and the like and has a joining protrusion formed on an outer surface thereof, and manufactured by molding a part having a jaw formed on the protrusion, and molding the part using the protrusion. A structure for attaching a protection circuit to a battery cell is disclosed by connecting. In addition, Korean Patent Application Laid-Open No. 2004-0062914 has a hook portion formed in a lower case of a battery, a groove is formed in the terminal terminal, so that the terminal terminal can be coupled in a hook form to the electrode portion, and the terminal Disclosed is a structure in which a protection circuit is mounted on a battery cell in such a manner that a protection circuit is assembled to a terminal in a hook form.

The above methods compensate for the disadvantages of the welding method by connecting the separate members including the protection circuit to the battery cell by fastening without using the welding method, but include the protection circuit by simply inserting and fastening. Since the coupling force between the members and the battery cells is weak, the possibility of separation is high, and the connection between the protection circuit and the electrode terminal is also weak because the protection circuit and the electrode terminal are simply electrically connected. .

Accordingly, an object of the present invention is to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

The inventors of the present application, after repeated in-depth research and various experiments, have a specific structure, and the first connecting member and the protruding terminal corresponding to the second electrode elastically surround the outer surface of the battery cell corresponding to the first electrode. The PCM structure is connected to the second connection member that is elastically fastened, and this PCM structure can be combined with the battery cell by a mechanical fastening method, which does not require a welding or soldering process requiring much time and skill. Instead, the bonding force between the battery cell and the PCM and the electrical connection between the electrode terminal of the battery cell and the PCM can be increased, and the advantages of maximizing the internal space of the battery pack were confirmed.

It is therefore an object of the present invention to provide a prefabricated PCM equipped with a connection member of a particular structure.

Still another object of the present invention is to provide a battery pack comprising the prefabricated PCM.

The protection circuit module according to the present invention for achieving the above object is a rectangular protection circuit module (PCM) including a protection circuit for controlling the overcharge, overdischarge and overcurrent of the battery cell, The first connection member of the plate-shaped conductive material connected to the first electrode terminal and the second connection member of the plate-shaped conductive material connected to the second electrode terminal of the battery cell are electrically connected to the protection circuit of the PCM. Is coupled to the bottom surface, the through-hole is formed in the center of the first connection member in which the second connection member is located in an electrically insulated state, both ends of the first connection member are both sides of the battery cell It is bent downward in the inner direction so that it can be fastened while wrapping elastically, it is composed of the electrical connection is achieved by the fastening.

That is, the connection member connected to the protection circuit module according to the present invention can be mechanically fastened to the electrode terminal of the battery cell, respectively, so that the electrical connection and mechanical connection with the electrode terminal in one step of mounting the protection circuit module to the battery cell The fastening can be done simultaneously.

Therefore, when the PCM combined with the first and second connection members of the present invention to the battery cell, the electrical connection is made by physical contact by mechanical fastening, it is possible to greatly reduce the welding work, the electrode through the electrode lead Since the combination with the terminal does not need to be performed, the number of parts can be reduced and economical, and the assembly process of the battery pack can be greatly shortened.

The battery cell may be formed of a battery case of a metal can. In such a battery cell, the battery case itself becomes conductive by connecting an electrode to the battery case. Therefore, when the first connection member is fastened while elastically wrapping the outer surface of the battery cell, that is, the battery case, the first connection member is electrically connected to the electrode connected to the battery case. In this case, since the first connection member is only partially in contact with a part of the outer surface of the battery case, a portion where both ends of the first connection member come into contact with the battery case while elastically surrounding both sides of the battery cell is particularly suitable. The present invention is not limited thereto, and may be preferably a top center portion of the battery cell.

The PCM according to the present invention is coupled to the first electrode terminal of the battery cell by the first connection member, and coupled to the second electrode terminal of the battery cell by the second connection member.

In one preferred embodiment, the second electrode terminal is formed to protrude in the center of the upper end of the battery cell, the first electrode terminal may be the outer surface of the remaining battery cell except the second electrode terminal portion. At this time, of course, the first electrode terminal and the second electrode terminal is electrically insulated.

In the battery cell having such a structure, the first connection member contacts the outer surface of the battery cell except for the second electrode terminal portion, and the second connection member positioned at the through hole formed in the first connection member is formed of a protruding type. By contacting the two electrode terminals, the protection circuit of the PCM and the battery cell can be electrically connected. Therefore, the through hole of the first connecting member is preferably formed at a position corresponding to the portion of the protruding second electrode terminal.

In the present invention, the first connection member, as defined above, the through hole through which the second connection member can be positioned in the electrically insulated state is formed in the center, both ends of the first connection member is a battery cell Consists of a structure that is bent downward in the inner direction to be fastened while wrapping elastically surrounding both sides of the.

In this structure, the portion bent downward in the inward direction is deformed in the outward direction corresponding to the shape of both sides of the battery cell, so that both sides of the battery cell are elastically applied with a predetermined tension in the inward direction by the restoring force. Will be wrapped. Accordingly, stable surface contact with both sides of the battery cell, for example, the front and rear surfaces of the battery cell can be achieved.

In one preferred example, the first connection member is mounted on the battery cell so as to minimize the excess portion protruding to the outside in the state in which the PCM is mounted on the battery cell and to ensure an elastic fastening to the battery cell The first taper portion bent downward in the outward direction and the second taper portion bent downward in the inward direction in succession to the first taper portion.

The first tapered portion may be bent downward in an outward direction to be in close contact with the top surface of the battery cell, thereby minimizing a portion protruding to the outside while the PCM is mounted in the battery cell. For example, when an insulating member (described later) having a size approximately corresponding to the top surface of the battery cell is mounted and the width of the PCM is relatively smaller than the insulating member, a predetermined step is formed between the battery cell top surfaces, Due to such a step, the first tapered portion may be formed in the corresponding portion so that the portion protruding to the outside of the first connecting member may be minimized. However, if such a step is not formed, it can be achieved with only the second tapered portion, so that the first tapered portion may not be formed.

The second taper portion corresponds to a portion in contact with the outer surface of the battery cell corresponding to the first electrode terminal to achieve electrical connection between the battery cell and the PCM. As described above, since the second taper portion is bent inwardly, the second taper portion may provide tension with respect to the outer surface of the battery cell, and thus the surface contact may enable stable contact with the outer surface of the battery cell. Therefore, the bending angle of the second tapered portion is not particularly limited, and may be preferably 10 to 40 degrees based on the outer surface of the battery cell. That is, if the bending angle of the second tapered portion is too large, it is inefficient because an excessively large force must be applied in the outward direction for mounting to the battery cell. On the contrary, if the bending angle is too small, a predetermined tension for stable contact with the outer surface of the battery cell is required. That is, it is not preferable because the restoring force cannot be exhibited.

On the other hand, the first connection member, as defined above, the through-hole is formed in the center so that the second connection member can be located. The through hole is preferably positioned at a corresponding portion of the second electrode terminal so that the second connecting member and the second electrode terminal can be electrically connected to each other.

The second connecting member is a member connected to the second electrode terminal, and is located at a through hole formed in the center of the first connecting member. Accordingly, the second connection member is not particularly limited as long as it can be electrically connected to the second electrode terminal and has a size smaller than the size of the through hole of the first connection member. Preferably, the second connection member is mechanically coupled to the second electrode terminal. Can be.

In one preferred embodiment, the second connecting member is connected to the protruding terminal of the battery cell is connected, and a pair of openings each exposed at both ends of the protruding terminal is perforated, and protrudes in the fastened state Both end portions of the second connecting member may be bent downward to correspond to the shape of the protruding terminal so that both side end sidewalls of the male terminal may be elastically pressed by the inner end of the opening.

The second connection member having such a structure may be stably fastened while pressing the sidewalls of both ends of the protrusion by the restoring force of the bent portion by fastening the bent portions formed at the both ends to the protruding terminal in the state of being elastically open. Accordingly, not only the PCM and the second electrode terminal may be electrically connected to each other, but also may be more securely mounted by assisting mechanical fastening of the battery cell and the PCM.

Meanwhile, in order to connect the second connecting member to the second electrode terminal, the through hole of the first connecting member in which the second connecting member is located has a size corresponding to or larger than that of the second electrode terminal, and corresponds to the second electrode terminal. It is preferable that it is formed in the position.

In addition, the first connecting member and the second connecting member must be electrically insulated. Therefore, it is preferable that these mutual positions are spaced apart from each other, and in order to further ensure insulation, for example, a predetermined insulating member is further inserted between the first connecting member and the second connecting member, or An insulating coating may be formed on the facing area.

The material of the connection member is not particularly limited as long as it has electrical conductivity to achieve electrical connection between the battery cell and the PCM. In addition, as described above, since the first connecting member and the second connecting member are elastically coupled to the electrode terminal by the deformation restoring force at the bent portion, it may be preferable that the first connecting member and the second connecting member are made of a material having a predetermined variability. Preferably nickel plate.

In one preferred embodiment, the connection member may be made of bi-metal (bi-metal) consisting of a metal having a different coefficient of thermal expansion. Accordingly, when the temperature of the battery cell is abnormally raised, the bimetal member may be bent outward and the electrical connection state with the electrode terminal may be released, thereby preventing the battery from igniting or exploding due to overcharge or overheating. have.

The method of coupling the first connection member and the second connection member to the lower surface of the PCM is not particularly limited. For example, welding such as laser welding, resistance welding, soldering, or the like may be used.

In one preferred example, the first connecting member and the second connecting member may be coupled to the bottom surface of the PCM by surface mount technology (SMT). Since the SMT scheme is known in the art, a detailed description thereof is omitted herein.

The PCM has a rectangular structure having a lower end thereof as the cross section of the battery cell so that the PCM can be coupled to the cross section where the electrode terminal of the battery cell is formed. Since the specific configuration and manufacturing method of the PCM, etc. are known in the art, a detailed description thereof will be omitted.

The present invention also relates to a battery pack in which the protective circuit module is mounted in a state where an electrode assembly having a cathode / separation membrane / cathode structure is electrically connected to a battery cell sealed with an electrolyte in an interior of a battery case. .

These battery packs are electrically connected by physical contact by mechanical coupling between the protection circuit module and the battery cell, thereby greatly reducing welding work, greatly shortening the assembly process of the battery pack, and reducing the number of parts. It is economical in that it has the advantage of excellent process efficiency.

In this case, the method of mounting the protective circuit module is not particularly limited as long as the first connection member is connected to the first electrode terminal and the second connection member can be connected to the second electrode terminal. The module may be mounted while pressing downwardly at the top of the position where the module is to be mounted. In this case, the lower end portion of the first connection member may be deformed so as to be in close contact with the outer surface of the battery after being mounted in a state slightly bent to the outside so as not to damage the outer surface of the battery cell.

In one preferred example, in a state in which the downwardly bent both ends of the first connecting member is elastically opened to surround both sides of the battery cell, the battery cell is inserted in a sliding manner from one direction of the upper end of the battery cell, and then pressed downward in place. Can be mounted.

That is, the bent portion of the first connection member is mounted on one side of the upper end of the battery cell in a state in which it is elastically expanded, and slides while pushing in the other direction, and then presses downward from the correct position where the protection circuit module is to be mounted. The second electrode terminal protruding from the top surface and the second connecting member of the protection circuit module are fastened.

In some cases, the battery cell may further include an insulating mounting member having an opening through which the electrode terminals may be exposed, and an insulating mounting member directly contacting an upper surface of the battery cell, between the battery cell and the PCM. As such, when the insulating mounting member is mounted on the top of the battery cell, the PCM is mounted on the insulating mounting member, and safety devices such as a PTC device and a fuse may be additionally installed in addition to the PCM.

In one preferred example, the insulating mounting member may have a size substantially coincident with the top surface of the battery cell, and may have a structure in which an opening through which the protruding electrode terminal of the battery cell is exposed is formed. In addition, both ends of the mounting member may be a structure that protrudes upward to a predetermined height in order to secure the mounting space of the PCM.

The battery cell is composed of an electrode assembly having a cathode / separator / cathode structure is sealed in the battery case together with the electrolyte, the type is not particularly limited. Preferably, it may be a battery in which an electrode assembly is housed in a metal battery case, and more preferably, a rectangular lithium secondary battery. The rectangular lithium secondary battery generally has a structure in which an electrode assembly is accommodated in an aluminum battery case, so that the battery case has a positive electrode and a protruding negative electrode terminal is formed at the center of the upper surface of the battery cell.

The electrode assembly is a power generator capable of charging and discharging composed of a laminated structure of a positive electrode, a separator, and a negative electrode, and may have a jelly-roll structure wound through a separator between a long sheet-type anode and a cathode coated with an active material. It may be a stacked structure in which a plurality of anodes and cathodes of a size are sequentially stacked in a state interposed in a separator. Among them, a jelly-roll type electrode assembly having advantages of easy manufacturing and high energy density per weight is more preferable. More specific configuration and manufacturing method of the prismatic lithium secondary battery and the electrode assembly is known in the art, the detailed description thereof is omitted herein.

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

2 is a perspective view schematically showing a prefabricated PCM according to one embodiment of the present invention.

Referring to FIG. 2, the PCM 100 has a PCB structure in which a protection circuit (not shown) for controlling overcharging, overdischarging, and overcurrent of a battery is printed on a rectangular structure of an epoxy composite.

At the bottom of the PCM 100, a first connection member 200 electrically connected to the protection circuit and a first connection member located in a through hole formed in the center of the first connection member 200 are electrically connected to the protection circuit. 2 connection members 300 are respectively coupled. The structures of the first connecting member 200 and the second connecting member 300 will be described in more detail with reference to FIGS. 3 and 4.

3A and 3B schematically show a perspective view 200a and a vertical cross-sectional view 200b of the first connecting member, respectively, and FIGS. 4A and 4B show a perspective view 300a and a vertical cross-sectional view 300b of the second connecting member, respectively. Each is schematically illustrated.

First, referring to FIGS. 3A and 3B, the first connection member 200 is formed of a conductive plate-like material, and is formed at the center of the flat portion 210 and the flat portion 210 of the upper portion coupled to the PCM (see FIG. 1). The through hole 220 where the second connecting member (not shown, see FIG. 4) can be positioned, the first tapered portion 231 continuously bent downward in the outward direction from the flat portion 210, and the first tapered portion It is comprised by the 2nd taper part 232 bend | folded downward in the inner direction successively to 231. As shown to FIG.

Since the first taper 231 has a bent shape corresponding to the stepped top surface of the battery cell in a state in which it is mounted on the battery cell (not shown), the first connection member ( It is possible to minimize the excess portion 200 is protruded to the outside. In addition, the second taper portion 232 is bent downward in the inward direction, and when it is mounted on the battery cell in the state in which it is elastically extended, the second taper part 232 may be elastically secured by applying tension to the outer surface of the battery cell by the restoring force. have.

As shown in FIGS. 4A and 4B, the second connection member 300 is formed of a conductive plate-like material, and extends from both sides of the portion 310 and the coupling portion 310 to be coupled to the PCM (see FIG. 1). And a pair of openings 330 perforated at both end portions 320 and both end portions 320, respectively.

Both end portions 320 are bent downward, so that the bent portion 321 is fastened in a state in which it is elastically unfolded, and then the inner end 331 of the opening 330 is both sides of the protruding terminal (not shown) by the restoring force. It can be fastened while elastically pressing the end side wall. Accordingly, the bent portion 321 is formed to substantially correspond to the height of the protruding terminal. Since the second connection member 300 is inserted into the through hole (FIG. 3A; 220) while maintaining an electrical insulation state with the first connection member (FIG. 3A; 200), the second connection member 300 preferably has a smaller size. In some cases, in order to ensure electrical insulation between the first connecting member 200 and the second connecting member 300, the outer circumferential surface of the second connecting member 300 or the through hole of the first connecting member (FIG. 3; An insulating tape may be attached to the inner circumferential surface of 220, or an insulating material may be coated.

In FIG. 5, a process of fastening the first connection member 200 to the battery cell is schematically illustrated. In FIG. 6, a side view of the first connection member 200 fastened to the battery cell is schematically illustrated. have.

Referring to these drawings, the second electrode terminal 410 protrudes from the center of the upper end surface of the battery cell 400, and an insulating mounting member 500 having a size substantially coincident with the upper end surface is mounted. An opening is formed in the insulating mounting member 500 to expose the second electrode terminal 410 of the battery cell 400, and both ends of the insulating mounting member 500 have a protective circuit board (not shown in FIG. 2) mounted thereon. Projected upward to a predetermined height.

The first connection member 200 is inserted in a sliding manner from one end of the battery cell 400 to the other end. At this time, the second bent portion 232 of the first connection member 200 is inserted in a state that is elastically open to surround both sides of the battery cell 400, the second bent portion ( 232 is in close contact with the outer surface of the battery. Accordingly, the outer surface of the battery cell corresponding to the first electrode terminal and the PCM (see FIG. 2) coupled with the first connection member are electrically connected. On the other hand, the first connection member 200 may be inserted while being pressed from the top of the battery cell 400, the mounting method is not particularly limited.

As shown in FIG. 6, the first bent portion 231 is bent outward to correspond to a step formed by the top surface of the battery cell 400 and the insulating mounting member 500, and the excess portion protrudes to the outside. Minimize and also serves to assist the insulating mounting member 500 is stably fixed.

7 schematically illustrates a process of fastening the second connection member 300 to the battery cell, and FIG. 8 schematically illustrates a side view of the state in which the second connection member 300 is fastened to the battery cell. have. In these drawings, since the battery cell 400 and the insulating mounting member 500 are the same as described with reference to FIGS. 5 and 6, description thereof will be omitted.

Referring to these drawings, the second connection member 300 is mounted while pressing downward from the upper portion of the protruding second electrode terminal 410 protruding from the center portion of the top surface of the battery cell. At this time, the bent portion 321 of the second connection member 300 is inserted into the second electrode terminal 410 in a state where it is elastically opened to be mounted on the opening 330 by the restoring force of the bent portion 321 in the mounted state. The inner end portion 331 is stably mounted while pressing both side end side walls of the second electrode terminal 410. Accordingly, as shown in FIG. 8, both ends of the second electrode terminal 410 are exposed while the second connection member 300 is fastened. The bent portion 321 of the second connection member 300 is bent at an angle corresponding to the step formed by the second electrode terminal 410 and the insulating mounting member 500, so that both ends of the second connection member 300 ( 320 is in close contact with the upper surface of the insulating mounting member 500.

In the above, the process of mounting each of the first connecting member 200 and the second connecting member 300 coupled to the PCM to the battery cell has been described. A process of manufacturing a battery pack by mounting the cell is schematically illustrated in FIGS. 9A to 9C. In this figure, the battery cell and the insulating mounting member are the same as those described with reference to FIGS. 5 and 6, and the structure of the PCM is the same as that described with reference to FIG. 1, and the portions referred to by the respective parts are also the same, and thus description thereof is omitted.

9A to 9C, first, both ends of the downwardly bent ends of the first connection members connected to the PCM are inserted in a sliding manner from one side of the upper end of the battery cell in a state in which they are elastically opened to surround both sides of the battery cell. (FIG. 9A: STEP 1). Accordingly, both ends of the first connecting member are in close contact with the upper outer surface of the battery cell corresponding to the first electrode terminal, thereby achieving electrical connection between the PCM and the first electrode terminal, and by means of a mechanical fastening method, Coupling with the battery cell and the insulating mounting member can be achieved.

Then, the second connection member is pressed downward in the correct position, that is, the second connection member located at the through hole of the first connection member is positioned at the upper end of the second electrode terminal to fasten the second connection member to the second electrode terminal (Fig. 9b: STEP 2). That is, the electrical connection between the second electrode terminal and the PCM can be achieved by the second connection member, and assists the stable coupling of the PCM, the insulating mounting member and the battery cell.

Finally, the top cap (not shown) is put on the top of the PCM and the outer surface of the battery cell is coated with an outer film (not shown) (FIG. 9 c: STEP 3).

An exploded perspective view of the battery pack manufactured as described above is schematically illustrated in FIG. 10.

Referring to FIG. 10, the battery pack according to the present invention includes a battery cell 400, an insulating mounting member 500, a PCM 100, insulating upper and lower caps 610 and 620, and an exterior film 700. Consists of a structure that includes.

The insulating mounting member 500 is mounted on the top surface of the battery cell 400 to be directly attached. The insulating mounting member 500 has an opening formed to expose the electrode terminal of the battery cell 400, and both ends protrude upwardly to a predetermined height so that the PCM 100 can be mounted on the upper portion thereof.

The PCM 100 is mounted on the upper portion of the insulating mounting member 500, and a portion bent downward from the first connection member coupled to the lower surface contacts the upper surface of the battery cell. A second connecting member inserted into a through hole formed at a portion corresponding to an electrode terminal protruding from the first connecting member to the upper surface of the battery cell 400 is coupled to the lower surface of the PCM.

The insulating upper cap 610 is coupled to the upper end of the battery cell 400 while wrapping the insulating mounting member 500 in the state where the PCM 100 is mounted, so as to surround the outer surface of the upper end of the battery cell 400. It extends downward to a predetermined length, and the A / S label 800 is attached to one side of the upper surface. The lower cap 620 is attached to the lower end of the battery cell 400 by the adhesive lower cap tape 550, and the outer circumference of the battery cell 400 is coated by the insulating outer film 700.

11 is a perspective view of a battery pack completed by one embodiment of the present invention.

Referring to FIG. 11, a battery pack is formed by an insulating top cap 610, an outer film 700, and a bottom cap (not shown) in a state where a PCM and an insulating mounting member are mounted on an upper end of a battery cell. Except for the external input / output terminal part, the remaining parts are electrically insulated from the outside.

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

As described above, the prefabricated PCM according to the present invention can increase the bonding force between the battery cell and the PCM without the need for a welding or soldering process, which requires a lot of time and skill in constructing a battery pack. Making the most of space is effective.

1 is a perspective view of an assembly process for electrically connecting a PCM to a battery cell in a conventional lithium secondary battery;

2 is a perspective view of a prefabricated PCM according to one embodiment of the present invention;

3A and 3B are perspective and vertical cross-sectional views of the first connecting member in FIG. 2;

4A and 4B are perspective and vertical cross-sectional views of the second connecting member in FIG. 2;

5 is a schematic diagram of a process of fastening a first connection member according to FIG. 3 to a battery cell;

FIG. 6 is a side view of a state in which one connection member is fastened to a battery cell in FIG. 5; FIG.

7 is a schematic diagram of a process of fastening the second connection member according to FIG. 4 to a battery cell;

FIG. 8 is a side view of the second connection member fastened to the battery cell in FIG. 7; FIG.

9a to 9c are schematic views of a series of processes for manufacturing a battery pack by mounting the PCM according to Figure 2 in the battery cell;

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

11 is a perspective view of a battery pack completed by an embodiment of the present invention.

<Description of Major Symbols in Drawing>

100: protection circuit module (PCM) 200: first connection member

300: second connection member 400: battery cell

500: insulating mounting member

Claims (13)

A rectangular protection circuit module (PCM) including a protection circuit for controlling overcharge, overdischarge, and overcurrent of a battery cell, The first connection member of the plate-shaped conductive material connected to the first electrode terminal of the battery cell and the second connection member of the plate-shaped conductive material connected to the second electrode terminal of the battery cell are electrically connected to the protection circuit of the PCM. Is coupled to the bottom face of the PCM Through-holes are formed in the center of the first connection member in which the second connection member is positioned in an electrically insulated state, and both ends of the first connection member may be fastened by elastically wrapping both sides of the battery cell. The battery cell protection circuit module is bent downward in the inner direction so that the electrical connection is achieved by the fastening. The protection circuit module according to claim 1, wherein the battery cell is formed of a battery case of a metal can. The protection circuit according to claim 1, wherein the second electrode terminal is formed to protrude in the center of the upper end of the battery cell, and the first electrode terminal is an outer surface of the battery cell except for the second electrode terminal portion. module. According to claim 1, wherein the first connection member is mounted on the battery cell, so as to minimize the excess portion protruding to the outside in the state in which the PCM is mounted on the battery cell and to ensure an elastic fastening to the battery cell And a first taper portion bent downward in the outward direction corresponding to the step of the PCM, and a second taper portion bent downward in the inward direction in succession to the first taper part. The method of claim 1, wherein the second connection member is connected to the protruding terminal of the battery cell is fastened, a pair of openings each exposed at both ends of the protruding terminal when the fastening is punctured, protruding in the fastened state A protective circuit module, characterized in that both end portions of the second connecting member are bent downward in correspondence with the shape of the protruding terminal so that both side end side walls of the male terminal can be fastened while being elastically pressed by the inner end of the opening. . The protection circuit module according to claim 1, wherein the first connection member and the second connection member are nickel plates. The protective circuit module according to claim 1, wherein a predetermined insulating member is additionally inserted between the first connecting member and the second connecting member, or an insulating coating is formed on a surface thereof. The protection circuit module according to claim 1, wherein the first connection member and the second connection member are coupled to the lower surface of the PCM by surface mount technology (SMT). The protective circuit module according to any one of claims 1 to 8, wherein the electrode assembly having the anode / separation membrane / cathode structure is mounted in an electrically connected state with an electrolyte solution to a battery cell sealed inside the battery case. A battery pack characterized by the above. The method of claim 9, wherein the protective circuit module is inserted in a sliding manner from one side of the upper end of the battery cell in a state in which the downwardly bent both ends of the first connection member is elastically opened to surround both sides of the battery cell, Battery pack, characterized in that is mounted by pressing downward in position. The battery pack according to claim 9, wherein an opening for exposing the electrode terminal is formed and an insulating mounting member mounted directly on the top surface of the battery cell is further included between the battery cell and the PCM. 12. The battery pack as claimed in claim 11, wherein the insulating mounting member has a size substantially coincident with the top surface of the battery cell, and an opening is formed at the center thereof to expose the protruding electrode terminal of the battery cell. The battery pack according to claim 9, wherein the battery cell is a rectangular lithium secondary battery.

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