KR200406606Y1 - Battery pack for mobile terminal - Google Patents

Abstract

The present invention relates to a battery pack for a mobile communication terminal, the positive terminal receiving portion for storing the positive terminal on the upper side of the positive electrode ground portion (5a) to one side of the mold case 111 formed to be attached to the upper portion of the battery cell (1) A base portion (112), a negative electrode terminal accommodating portion (114) for accommodating the negative electrode terminal on the upper portion of the negative electrode ground portion (5b), and a plurality of wedge-shaped detachable protrusions (117) formed at regular intervals ( 110 and the positive electrode terminal tab 124 formed to protrude one side while being seated on the positive electrode terminal jaw 113 of the base 110 is formed to be accommodated in the positive electrode terminal receiving portion 112, and the negative electrode terminal fixing projections. The negative electrode terminal tab 125 having one side protruding while being fixed to the 115 is formed to be accommodated in the negative electrode terminal storage unit 114, and the positive electrode fixing piece 122 and the negative electrode fixing piece 123 are formed at a lower portion thereof to form the positive electrode terminal. Electronic protective circuit board 121 which is ground-coupled to the one side protrusion of the tab 124 and the negative terminal tab 125 The base unit 110 has a plurality of detachable grooves 132 on the outside of the circuit portion 120 is formed, and the mold case 131 formed therein to accommodate the upper portion of the circuit portion 120. It is formed in a position that is coupled to the removable projection 117 of the base portion 110, characterized in that it comprises a casing portion 130 for fixing the circuit portion 120 while being detached.

Battery Pack, Breakaway Jaw, Mold Case, Mold Base, Welding Groove

Description

Battery Pack for Mobile Phones {Battery Pack for Mobile Phone}

1 is a perspective view showing a typical battery pack.

2 is a perspective view showing a combined state of a typical battery pack.

3 is a perspective view showing a battery pack for a mobile communication terminal according to the prior art.

Figure 4 is an exploded perspective view showing a battery pack for a mobile communication terminal according to the present invention.

Figure 5 is a perspective view showing a base portion of the main part of the battery pack for a mobile communication terminal according to the present invention.

Figure 6 is a perspective view showing a circuit portion of the main part of the battery pack for a mobile communication terminal according to the present invention.

7 is a perspective view illustrating a state in which a base portion and a terminal tab which are main parts of a battery pack for a mobile communication terminal according to the present invention are combined;

8 is a cutaway perspective view showing a state in which the base portion and the terminal tab, which is the main part of the battery pack for a mobile communication terminal according to the present invention, a part of which is cut.

Figure 9 is a perspective view showing a casing part of the main part of the battery pack for a mobile communication terminal according to the present invention.

* Description of the symbols for the main parts of the drawings *

1 battery cell 3 top cover

5a: positive electrode ground portion 5b: negative electrode ground portion

7a: positive ground tab 7b: negative ground tab

8: back label 9: lower cover

100: battery pack 110: base portion

111 mold base 112 positive electrode terminal

113: positive electrode terminal jaw 114: negative electrode terminal

115: negative terminal fixing projections 116: circuit fixing

117: detachable protrusion 118: circuit fixing protrusion

119: base fixing groove 120: circuit

121: battery protection circuit board 122: positive electrode fixing piece

123: negative electrode fixing 124: positive terminal tab

124a: welding groove 125: negative terminal tab

125a: welding groove 126: fixing hole

130: casing 131: mold case

132: removable groove 133: housing

134: release prevention jaw 135: adhesive

136: engaging projection

The present invention relates to a battery pack for a mobile communication terminal, and more particularly, a mold base is attached to an upper part of a battery cell, a terminal tab fused with a positive electrode and a negative electrode ground part is stored inside the mold base, The mold case with the separation prevention jaw formed to one side in the state where the electronic protective circuit board is connected and fixed to the upper part is coupled to the mold base side while preventing the electronic protective circuit board from being separated. The present invention relates to a battery pack for a mobile communication terminal which increases the service life and improves the connection efficiency.

In general, a mobile communication terminal having a built-in battery pack includes a main body, a battery accommodating part, a battery pack, and a battery cover, wherein the battery pack is mounted inside the main body, and a cover is installed to surround the battery pack on the battery pack. It consists of a structure.

A general battery pack configured as described above will be described with reference to FIGS. 1 and 2.

A battery cell (1) made of a metal having any one of a lithium ion battery, a lithium manganese battery, or a lithium cadmium battery, and a top cover (3) welded with a laser to maintain airtightness on an upper end of the battery cell (3). ).

As described above, the top cover is coupled to the back label 8 to the outside of the battery cell and the lower cover 9 is coupled to the lower end of the back label 8.

The top cover 3 forms a positive (+) pole ground portion 5a and a negative (-) pole ground portion 5b electrically connected to an inner battery, and the ground portions 5a and 5b. Is connected to the positive and negative ground terminals formed on one surface of a protection circuit module (PCM) for connecting a battery cell and an external circuit through the positive and negative ground tabs 7a and 7b, respectively, to supply power. .

In this case, the positive electrode and the negative electrode ground tabs 7a and 7b need to accurately secure the relative positions of the external input / output terminals with respect to the exterior body or the resin mold. Each of the top covers 3 is fixedly coupled to the positive electrode negative electrode ground portions 5a and 5b through spot welding to accurately fix the positions to the positive electrode and negative electrode ground portions 5a and 5b.

However, there is a problem in that the production cost increases as a fixing device for fixing the ground tab in place is performed by performing spot welding at a high temperature and high pressure in the state where the ground tab is located at the upper side of the ground portion.

In addition, as the grounding tab is fused at high temperature and high pressure to the grounding portion, deformation occurs in the thin tab and displacement of the position occurs after joining.

Recently, a battery pack for a mobile communication terminal of the prior art in which a grounding tab is formed in an elastic spring shape except for a spot welding process is disclosed in Korean Utility Model Application No. 20-2004-0029461, which is shown in FIG. Looking at it as follows.

A battery cell 11 having a lithium ion battery embedded therein, and a top cover 13 coupled to the upper opening of the battery cell 11 through air welding to maintain airtightness, and a lower cover 23 at the bottom thereof. After bonding and bonding by double-sided adhesive, the outer surface of the battery cell 11 is wrapped with a back label 21.

In this case, the top cover 13 has a plurality of extension portions 14a ?? 14d formed to protrude at the same height in the vertical direction with a predetermined width along both sides, and the plurality of extension portions 14a? 14d), a plurality of coupling holes 15a? 15d are formed at the same level, respectively.

In addition, the battery protection circuit board block 17 of the mold type in which the electronic protection circuit board is inserted therein is provided with a plurality of extensions 14a? 14 so that the plurality of extensions 14a? A plurality of grooves 18a? 18d corresponding to? 14d) are formed.

Further, fixing holes 17a and 17b are formed in the lower center portion of the battery protection circuit board block 17 to insert one end of the positive and negative ground terminals 12a and 12b described below as shown in FIG. 4. .

In addition, a plurality of coupling protrusions 19a ?? 19d are formed on the bottom surface of the plurality of recesses 18a ?? 18b, and the plurality of coupling protrusions 19a ?? 19d are formed on the battery protection circuit board block 17. ) And the top cover 13 are positioned in correspondence with the plurality of coupling holes 15a ?? 15d so as to snap into the coupling holes 15a ?? 15d of the plurality of extensions 14a ?? 14d. It is.

Here, it is preferable that the plurality of coupling protrusions 19a ?? 19d be formed to be inclined at a predetermined angle so that the coupling surface 19e is easily coupled to the plurality of coupling holes 15a ?? 15d.

On the other hand, the positive and negative ground terminals 12a and 12b having a coil spring shape to have self-elasticity have one end pressed by a predetermined pressure between the battery protection circuit board block 17 and the top cover 13 which are snap-coupled to each other. The battery protection circuit board block 17 is inserted into the fixing holes 17a and 17b, respectively, and the other ends thereof are in elastic contact with the positive electrode and the negative electrode ground portions 13a and 13b of the top cover 13, respectively.

Such a battery pack for a mobile communication terminal according to the related art uses a ground terminal that elastically couples a ground tab in contact with a ground to a coil spring, thereby reducing the welding process and improving a coil spring shape to improve productivity. Theoretically, the grounding rate seems to be improved by reducing the interruption rate of the power supply.However, the contact efficiency is rather reduced and the elastic force is caused by the flow as the connection terminal and the grounding part are grounded by the line contact instead of the surface contact by the curvature of the spring. According to the change of the interruption rate is also increased, there was a problem that the grounding efficiency is greatly reduced.

In addition, the battery pack for a mobile communication terminal of the prior art is formed with a plurality of extensions protruding to the same height in the vertical direction with a predetermined width along both sides of the top cover coupled to the battery cell to primarily transfer power. Deformation of the top cover with a grounded portion that primarily applies power to the battery cell reduces power transmission efficiency, and a fixed load for fixing the electronic protection circuit concentrates on the top cover, resulting in continued use of the battery pack. There was a problem that the life is reduced by the breakage and damage caused by the flow load.

In addition, the battery pack for a mobile communication terminal of the related art improves the fixing force by modifying the shape of the top cover attached to the upper part of the battery cell, thereby preventing the use of the existing top cover-attached electronic cell and producing new products. There was a problem that the production cost is increased as the line must be installed.

In addition, the battery pack for a mobile communication terminal of the prior art is applied to power by forming a grounding terminal of the battery cell in the form of a coil spring, but the metal having good electrical conductivity is formed to be ductile, making the coil spring difficult to produce and producing a high cost. Not only is it increased, it is easily damaged due to problems in strength, and when a rigid metal is used, secondary processing such as plating is required to improve electrical conductivity, thereby increasing production cost and time.

In order to solve the above problems, the main object of the present invention is to accommodate the electronic protective circuit board connected to the terminal tabs that are grounded to the positive electrode and the negative electrode on the upper part of the battery cell for supplying power to the mold case by fixing to the mold base, The added load is distributed between the mold case and the mold base assembly to increase the service life.

In addition, another object of the present invention is to weld the terminal tabs that are grounded to the positive electrode and the negative electrode in the upper part of the upper part of the battery cell in the state in which it is housed in the mold base, thereby improving the grounding force by the surface contact with the ground part of the battery cell It is to improve the fixing force by fixing it firmly and accurately.

In addition, another object of the present invention is to improve the productivity by easily assembling to prevent the separation of the electronic protective circuit board during assembly by forming a departure prevention projection to one side lower end of the mold case coupled to the upper part of the battery cell. .

As such, a battery pack for a mobile communication terminal devised to achieve the object includes a top cover formed on top of a positive electrode grounding portion and a negative electrode grounding portion, and a back label outside the battery cell for supplying power for the positive electrode and the negative electrode. In the battery pack to form a lower and coupled to the lower cover, the positive electrode terminal for receiving the positive terminal by forming a positive terminal terminal jaw at both ends in the upper portion of the positive electrode ground portion to one side of the mold case formed to be attached to the top of the top cover The accommodating part is formed, and a negative electrode terminal fixing protrusion is formed at one end on the negative electrode grounding part to form a negative electrode terminal accommodating part for accommodating the negative electrode terminal, and a plurality of circuit fixing pieces are formed to protrude upward, and have a wedge shape at regular intervals. A base portion having a plurality of detachable protrusions formed thereon, and a cathode terminal tab protruding from one side while being placed on the cathode terminal restraint of the base portion are defined. It is formed to be accommodated in the pole terminal receiving portion, and fixed to the negative electrode terminal fixing projections to form a negative terminal tab protruding one side to be accommodated in the negative electrode terminal receiving portion, and to form a positive electrode fixed piece and a negative electrode fixed piece in the lower portion of the positive terminal tab And a plurality of detachable grooves coupled to the detachable protrusions on the outside of the circuit part in which an electronic protective circuit board is ground-coupled to one protruding portion of the negative terminal tab, and a mold case formed therein to accommodate the upper portion of the circuit part. It is characterized in that it comprises a casing portion which is formed at a position and fixed to the circuit portion while detachable from the base portion.

Further, circuit fixing protrusions are formed at both ends of the base part at one side to be inserted into the fixing holes formed at both ends of the electronic protection circuit board, and casing fixing grooves are formed at the other side to be inserted into the coupling protrusions formed at both ends of the casing for binding force. Characterized in that configured to increase.

In addition, the circuit part forms a welding groove in the connection portion of the positive electrode terminal tab connected to the positive electrode grounding portion, and forms a welding groove in the connection portion of the negative terminal tab connected to the negative electrode grounding portion to easily weld and improve welding efficiency. A battery pack of a mobile communication terminal, characterized in that configured to increase.

In addition, the casing part protrudes from the bottom of one side of the mold case to prevent the separation to the circuit portion to be coupled, and to form an adhesive portion coated with an adhesive on the outside of the separation prevention jaw to bond with the back label in a state of being coupled to the battery cell It characterized in that the configuration to improve the fixing force.

As described above, a preferred embodiment of the battery pack for a mobile communication terminal according to the present invention will be described with reference to the accompanying drawings.

Figure 4 is an exploded perspective view showing a battery pack for a mobile communication terminal according to the present invention, Figure 5 is a perspective view showing a base portion of the main part of the battery pack for a mobile communication terminal according to the present invention, Figure 6 is a mobile according to the present invention FIG. 7 is a perspective view illustrating a circuit part that is a main part of a battery pack for a communication terminal, and FIG. 7 is a perspective view illustrating a state in which a base part and a terminal tab, which is a main part of a battery pack for a mobile communication terminal according to the present invention, are coupled to each other, and FIG. Fig. 9 is a cutaway perspective view illustrating a state in which a base portion and a terminal tab of a battery pack for a mobile communication terminal according to the present invention are coupled to each other, and FIG. 9 is a casing which is a main part of a battery pack for a mobile communication terminal according to the present invention. It is a perspective view which shows a part.

As shown in FIGS. 4 to 9, a battery cell 1 having a top cover 3 having a positive electrode ground portion 5a and a negative electrode ground portion 5b formed thereon to supply power to the positive electrode and the negative electrode In the battery pack 100 is formed by forming a back label (8) to the outside of the lower cover 9 in the lower portion, is attached to the upper portion of the top cover (3) at the position of the positive electrode ground portion (5a) A base part 110 having a positive electrode terminal part 112 formed therein and a negative terminal terminal part 113 formed at the negative electrode ground part 5b; and a positive electrode at the positive terminal terminal part 112 of the base part 110; The ground terminal 5a and the grounded positive terminal tab 124 are accommodated, and the negative terminal terminal 114 stores the negative ground terminal and the grounded negative terminal tab 125 at the upper portion of the electronic protection circuit board 121. A circuit part 120 coupled to the base part 110 in a connected state, and a casing part 130 coupled to the base part 110 while accommodating the circuit part 120. .

The base 110 is formed on both sides of the positive electrode ground portion 5a on one side of the mold case 111 formed to be attached to the upper portion of the top cover 3 to form a positive terminal terminal jaw 113 at both ends. A negative electrode terminal 112 for accommodating is formed, and a negative electrode terminal fixing protrusion 115 is formed on one end of the negative electrode ground portion 5b to form a negative terminal terminal 114 for accommodating the negative terminal. The plurality of circuit fixing pieces 116 are formed to protrude upward, and a plurality of wedge-shaped detachable protrusions 117 are formed at regular intervals.

The circuit part 120 is formed so as to be accommodated in the positive electrode terminal 112 by the positive terminal tab 124 protruding from one side while being placed on the positive terminal fixing jaw 113 of the base part 110, and fixing the negative terminal. The negative electrode tab 125 having one side protruding while being fixed to the protrusion 115 is formed to be accommodated in the negative electrode terminal receiving part 114, and the positive electrode fixing piece 122 and the negative electrode fixing piece 123 are formed at the bottom thereof. The electronic protective circuit board 121 which is ground-coupled to one protruding portion of the positive terminal tab 124 and the negative terminal tab 125 is formed.

Here, the circuit part 120 forms a welding groove 124a in the connection portion of the positive electrode terminal tab 124 connected to the positive electrode ground portion 5a, and the negative electrode terminal tab 125 connected to the negative electrode ground portion 5b. It is preferable that the welding groove 125a is formed in the connecting couple of to be easily welded and configured to increase the welding efficiency.

The casing unit 130 includes a plurality of detachable grooves 132 on and outside of the base unit 110 in the mold case 131 having the housing 133 formed therein to accommodate the upper portion of the circuit unit 120. It is formed in the position coupled with 117 is configured to secure the circuit portion 120 while being detached from the base portion 110.

Here, the casing unit 130 prevents the detachment to the circuit unit 120 coupled by protruding the separation prevention jaw 134 to one side of the mold case 131, the adhesive is applied to the outside of the separation prevention jaw 134 It is preferable to form the adhesive part 135 to be bonded to the back label 8 in a state of being bonded to the battery cell 1 so as to improve the fixing force.

In addition, the circuit fixing protrusions 118 are formed at both ends of the base part 110 at one side to be inserted into the fixing holes 126 formed at both ends of the electronic protection circuit board 121, and the casing fixing grooves 119 at the other side thereof. It is preferable to configure to increase the binding force by forming a coupling to the coupling protrusion 136 formed on both ends of the casing (130).

Thus, look at the coupling structure and operation of the battery pack for a mobile communication terminal of the present invention configured as follows.

First, in the state where the top cover 3 having the positive electrode ground portion 5a and the negative electrode ground portion 5b is formed on the battery cell 1 at the upper portion, the positive electrode terminal jaw 113 of the mold base 111 is formed. The positive electrode terminal tab 124 is placed in the correct position and stored in the positive electrode terminal receiving unit 112, and the negative terminal terminal 125 is inserted into the lower portion so that the negative terminal tab 125 is fixed to the negative position. An upper body of the top cover 3 is a combination of the accommodating part 114 and the positive terminal tab 124 and the negative terminal tab 125 coupled to the ground at the positions of the positive electrode ground portion 5a and the negative electrode ground portion 5b. Attach to

As such, the mold base 111, the positive electrode terminal tab 124, and the negative electrode terminal tab 1250 are attached to the top cover 3 and are formed on the positive electrode terminal tab 124 grounded with the positive electrode ground portion 5a. Spot welding is applied to the welding groove 125a formed in the positive electrode terminal tab 125 which is grounded with the welding groove 124a and the negative electrode ground portion 5b to be firmly welded.

At this time, the positive electrode terminal tab 124 and the negative electrode terminal 125 which are fused at high temperature and high pressure are accommodated in the positive terminal terminal 112 and the negative terminal terminal 114 of the mold base 111 and are separated from the fixed position. Minimizes deformation due to heat or pressure, and prevents the welding from being precisely welded to the positions of the welding grooves 124a and 125a, thereby easily setting the welding position and increasing the welding efficiency.

As described above, the mold base 111 of the base unit 110 is coupled to the battery cell 1 so that the positive terminal tab 124 and the negative terminal tab 125 are fused to each other. When inserted into the bottom to be fixedly coupled to the positive electrode fixing piece 122 and the negative electrode fixing piece 123 formed in the lower portion is coupled to the circuit fixing piece 116 formed in plural to the mold base and at the same time fixed to the circuit portion 120 formed at both ends As the circuit fixing protrusion 118 of the mold base 111 is inserted into and coupled to the ball 126, the power of the positive electrode and the negative electrode is firmly fixed to ground with the electronic protection circuit board 121.

In this way, the circuit part 120 is fixed to the base part 110 in the state in which the mold case 131 in the correct position while preventing the separation of the circuit part 120 with the escape prevention jaw 134 protruding downward on one side. When combined, the wedge-shaped detachable protrusion 117 of the mold base 111 is inserted into the detachable groove 132 formed in the lower portion while the circuit unit is accommodated in the accommodating portion 133 formed therein so that the casing portion 130 is formed as the base portion ( 110).

At this time, the coupling protrusion 136 formed at both ends of the casing 130 is inserted into the casing fixing groove 119 of the base 110 to strengthen the binding force.

As described above, when the back label 8 is inserted into the outside of the electronic cell 1 in which the base unit 110 and the casing unit 130 are coupled with the circuit unit 120 inserted into the center, the battery unit 120 is inserted into the battery cell side. The adhesive part 135 formed on the outside of the separation prevention jaw 134 is formed to be firmly assembled while being bonded to the back label 8.

Accordingly, the top cover 3 is placed on the top cover 3 in a state in which the positive terminal tab 124 and the negative terminal tab 125 are accommodated in the mold base 111 including the positive terminal housing 112 and the negative terminal storage 114. It is attached so that it is coupled to the right position while minimizing deformation due to heat and pressure and flow due to external force during fusion, thereby increasing the binding force and minimizing defects, and welding grooves on the positive terminal tab 124 and the negative terminal tab 125. 124a and 125a are respectively formed to facilitate positioning and increase the fusion efficiency, and protrude to one side lower portion of the mold case 130 to form a separation prevention jaw 134 having an adhesive part 135 to the outside. Alignment prevents the separation while aligning the circuit portion 120, and after bonding to bond with the back label (8) to improve the assembly and fixing force.

As such, the battery pack for a mobile communication terminal according to the present invention includes a mold base accommodating a terminal tab grounded to a ground portion of a top cover formed on an upper portion of a battery cell for supplying power, and a terminal positioned at a ground portion. While fixing the spot welding to the mold base to fix the spot welding on the tab, fix the mold case with the anti-separation protrusion formed at the bottom of one side with the mold base to protect the electronic protection circuit and the ground part of the battery cell. Formed to be fixed, to minimize the flow by the external force to improve the grounding force of the electronic protection circuit and the electronic cell, and to increase the life by distributing the load applied by the use of the battery tab to the combination of the mold case and the mold base .

In addition, another object of the present invention is to form an accommodating portion for receiving and fixing the terminal tab in the mold base attached to the top cover of the battery cell to fix the terminal tab during spot welding at high temperature and high pressure to deform due to heat and pressure By minimizing and fixing the position of the terminal tab even after welding, the surface contact with the ground portion of the battery cell in the right position to improve the grounding force, and provides a strong and accurate fixing to improve the fixing force.

In addition, the battery pack for a mobile communication terminal of the present invention is fixed to the fixing protrusions of the mold base in the fixing hole formed on both sides of the electronic protective circuit board in the state of surface contact fixing by welding the terminal tab to the ground of the battery cell. Desorption and fixing to the detachable grooves of the mold case with the detachable protrusions formed before and after, thereby providing the effect of increasing the service life and increasing productivity by firmly coupling the plurality of grooves and the protrusions to improve the fixing force.

In addition, the battery pack for the mobile communication terminal of the present invention protrudes the escape prevention jaw to the lower side of one side of the mold case coupled to the upper part of the battery cell to prevent the flow of the electronic protective circuit board during assembly in the correct position without correction in position It is possible to assemble at one time, improve the convenience of assembly, and after bonding, the adhesive is formed by applying the adhesive to the outside of the release prevention jaw to the back label mounted on the outside of the battery cell to increase the fixing force to improve productivity. to provide.

In addition, the battery pack for a mobile communication terminal of the present invention is to form a welding groove in the welded portion of the terminal tab fused to the ground portion of the battery cell to set the position so as to accurately weld to improve the welding convenience and work efficiency As it increases and is fused to the inside of the groove, it is firmly fused to minimize the interruption rate due to the flow, thereby providing an effect of improving the quality of the battery pack.

Claims (4)

A top label 3 having a positive ground portion 5a and a negative ground portion 5b formed thereon forms a back label 8 on the outside of the battery cell 1 for supplying power for the positive electrode and the negative electrode. In the battery pack 100 to couple the lower cover 9 to the lower, A positive electrode terminal accommodating portion for accommodating the positive electrode terminals by forming positive terminal terminal jaws 113 at both ends of the positive electrode ground portion 5a at one side of the mold case 111 formed to be attached to the upper portion of the top cover 3. And forming a negative electrode terminal fixing protrusion 115 at one end on the negative electrode ground portion 5b to form a negative terminal receiving portion 114 for accommodating the negative electrode terminals. A base portion 110 protruding from the upper portion and having a plurality of wedge-shaped detachable protrusions 117 formed at regular intervals; The positive electrode terminal tab 124 is formed so as to be accommodated in the positive electrode terminal receiving portion 112 while being seated on the positive electrode terminal jaw 113 of the base portion 110, and to the negative electrode terminal fixing protrusion 115. The negative terminal tab 125 protruding from one side while being fixed is formed to be accommodated in the negative terminal receiving part 114, and the positive electrode fixing piece 122 and the negative electrode fixing piece 123 are formed at the bottom thereof, and thus the positive terminal tab 124 is formed. ) And a circuit unit 120 having an electronic protective circuit board 121 coupled to ground at one protruding portion of the negative terminal tab 125. The plurality of detachable grooves 132 are coupled to the detachable protrusion 117 of the base unit 110 to the outside in the mold case 131 having the accommodating part 133 formed therein to accommodate the upper portion of the circuit unit 120. A battery pack for a mobile communication terminal, characterized in that it comprises a casing portion 130 to fix the circuit portion 120 while being formed in the base portion 110 and detachable. The method of claim 1, The circuit fixing protrusion 118 is formed at one end of both ends of the base part 110 to be inserted into the fixing holes 126 formed at both ends of the electronic protection circuit board 121, and the casing fixing groove 119 is formed at the other side thereof. The battery pack for a mobile communication terminal, characterized in that the coupling to form a coupling protrusion 136 formed on both ends of the casing 130 to increase the binding force. The method of claim 1, The circuit part 120 forms a welding groove 124a in a connection portion of the positive electrode terminal tab 124 connected to the positive electrode ground portion 5a and the negative electrode terminal tab 125 connected to the negative electrode ground portion 5b. The battery pack of the mobile communication terminal, characterized in that to form a welding groove (125a) in the connection couple to easily weld and increase the fusion efficiency. The method of claim 1, The casing unit 130 prevents the detachment of the circuit unit 120 to be coupled by forming an escape barrier 134 to one side lower portion of the mold case 131, and an adhesive is applied to the outside of the release barrier 134. The battery pack for a mobile communication terminal, characterized in that to form an adhesive portion 135 and bonded to the back label (8) in a state coupled to the battery cell (1) to improve the fixing force.

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