KR100770097B1 - Polymer battery pack - Google Patents

Abstract

A polymer battery pack is provided to improve resistance against external impact such as bending, twisting and falling, stability and assembly processability. A polymer battery pack(100) comprises a polymer battery provided with an exposed electrode tap(131) at one end; a metal case(120) which surrounds the polymer battery with exposing the electrode tap of the polymer battery; and a protection circuit board which is connected with the electrode tap exposed through the metal case, wherein the metal case comprises an upper case which surrounds the upper part and both side parts of the polymer batter, a lower case which surrounds the lower part and both side parts of the polymer batter, and a back connection plate which surrounds the back part of the polymer battery and connects the back parts of the upper case and the lower case.

Description

Polymer battery pack {Polymer battery pack}

1 is a perspective view showing a polymer battery pack according to the present invention.

2 is a perspective view showing a state before a molding process in the polymer battery pack according to the present invention.

3 is an exploded perspective view showing a polymer battery pack according to the present invention.

Figure 4a is a perspective view showing a state before the metal case is completely folded of the polymer battery pack according to the present invention, Figure 4b is a perspective view showing a state after the metal case is completely folded, Figure 4c is an enlarged region 4c of Figure 4b. It is a perspective view shown.

5A is a cross-sectional view taken along line 5a-5a of FIG. 1, FIG. 5B is a cross-sectional view taken along line 5b-5b in FIG. 1, and FIG. 5C is a cross-sectional view taken along line 5c-5c in FIG.

<Description of Symbols for Main Parts of Drawings>

100; Polymer battery pack 110; Polymer battery

111; Electrode tab 112; pouch

112a; Metal foils 112b, 112c; Insulation layer

113; Electrode assembly 113a; Anode electrode plate

113b; Separator 113c; Cathode electrode plate

120; Metal case 120a; Rear connecting plate

121; Upper case 122; Upper area

123; Side region 123a; water level

123b; Vertical surface 124a; Locking Hall

124b; Opening 124c; Surface

124d; Vertical plane 125; Lower case

126; Lower region 127; Lateral area

127a; First horizontal plane 127b; First vertical plane

127c; Second horizontal plane 127d; Second vertical plane

128a; Locking hole 128b; water level

130; Protective circuit board 131; Electrode terminals

132; Electrode leads 133 and 134; Insulation member

140; Resin 141; Opening

142; Hole 143; Flood

150; Cover 151; Vertical body

152; Upper horizontal protrusion 153; Lower horizontal projection

154; Protrusion 155; Insulation member

161; Insulation member 162; label

The present invention relates to a polymer battery pack, and more particularly to a polymer battery pack with improved strength, stability and reliability.

The conventional polymer battery pack includes a lithium polymer battery in which a protective circuit member is connected to a pouch-shaped bare cell, and a plastic case in which the edges are ultrasonically welded while the lithium polymer battery is accommodated. Here, the pouch-shaped bare cell is an electrode assembly and a polymer comprising an anode electrode plate / separator / anode electrode plate inside a pouch made of modified polypropylene (CPP) / aluminum / nylon (or polyethylene terephthalate (PET)). It has a form in which electrolyte is stored. For reference, such a polymer battery is named because it uses a polymer electrolyte solution differently from a lithium ion battery using a liquid electrolyte solution.

On the other hand, such a conventional polymer battery pack has a weak strength of the pouch constituting the bare cell and the plastic case surrounding it, so that it can be easily damaged by external shocks such as bending, twisting and dropping, and thus stability and There is a problem that the reliability is lowered.

That is, the aluminum used in the pouch is in the form of a foil of very thin thickness, and the plastic case surrounding it also has a very thin thickness, so that the strength is weak and thus can be easily deformed, broken and damaged by external force. For example, the plastic case and the pouch are easily penetrated by a sharp nail or a needle. Of course, when the polymer battery pack is deformed, damaged, damaged, or penetrated by a sharp nail or needle, the function of the battery may be stopped due to an internal short or the battery may malfunction.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned conventional problems, and an object of the present invention is to provide a polymer battery pack that can improve the strength and stability of a battery by using a metal case instead of a plastic case as an exterior material of a polymer battery. .

Another object of the present invention is to provide a polymer battery pack capable of improving the bonding strength with a resin by forming a plurality of locking holes in a metal case.

It is still another object of the present invention to provide a polymer battery pack in which a step is formed in a metal case and the assembly is improved by mutually coupling in the vertical direction, and the thickness and width of the pack conform to the standard.

It is another object of the present invention to provide a polymer battery pack that can improve assembly and reliability by wrapping a polymer battery in an integrated metal case instead of a separate type.

In order to achieve the above object, a polymer battery pack according to the present invention includes a polymer battery formed by exposing an electrode tab to one side, a polymer case surrounding the polymer battery, and an electrode tab of the polymer battery exposed to the outside; A protective circuit board connected to the electrode tab exposed through the metal case, wherein the metal case includes an upper case surrounding an upper portion and both sides of the polymer battery, a lower case surrounding the lower portion and both sides of the polymer battery, and A rear connecting plate may be formed to surround the rear of the polymer battery and simultaneously interconnect the rear of the upper case and the lower case.

The rear connecting plate may be integrally formed with the upper case and the lower case, and bent at a right angle from the upper case and the lower case.

In addition, the upper case and the lower case may be coupled to both sides in the vertical direction through the polymer battery.

In addition, an opening may be formed through the front of the upper case and the lower case, and the electrode tab of the polymer battery may be exposed through the opening. In addition, the protective circuit board may be positioned outside the opening of the metal case. In addition, the protective circuit board may be molded in resin and fixed to the metal case.

In addition, the metal case may be formed with at least one locking hole in the front having an opening, and the opening, the locking hole and the protective circuit board may be molded and wrapped with resin.

In addition, a cover is further coupled to opposite sides of the metal case, and a protrusion protruding inward is further formed on the cover adjacent to the opening, and the protrusion may be molded of the resin.

In addition, the metal case may be formed of any one selected from steel, stainless steel (SUS), aluminum (Al), copper (Cu), or a metal alloy.

In addition, an insulating member may be further interposed between the electrode tab of the polymer battery and the metal case so that the electrode tab is not shorted to the metal case. The insulating member may be molded of resin together with the protective circuit board.

In addition, an electrode lead coupled to the electrode tab of the polymer battery is formed on the protective circuit board, and the electrode lead is bent and welded to the electrode tab, but an insulating member may be interposed between the bent electrode leads. have. The insulating member may be molded of resin together with the protective circuit board.

In addition, a label may be adhered to the surface of the metal case.

In addition, the label may be formed to surround the upper case, the lower case and the rear connecting plate of the metal case.

In addition, at least one electrode terminal may be formed in the protective circuit board, and the entire region except the electrode terminal may be molded of resin. At least one hole may be formed in the resin to communicate with the protection circuit board, and the immersion paper may be further adhered to the surface of the hole to determine whether moisture has penetrated.

The upper case of the metal case may include an upper region of a predetermined width and a side region bent downward from both sides of the upper region, and the lower case may include a lower region of a predetermined width and both sides of the lower region. And a side region bent upward from the side region, and the side region of the upper case and the side region of the lower case may be coupled to each other.

In addition, the side region of the upper case includes a horizontal surface lower than the upper region and extending in an outward direction, and a vertical surface bent downwardly extending from the horizontal surface, the side region of the lower case is less than the lower region A first horizontal plane that is high and extends outwardly, a first vertical plane that is bent upwards from the first horizontal plane, a second horizontal plane that is bent and extended inwardly from the first vertical plane, and the second horizontal plane It includes a second vertical surface which is bent in an upward direction from the upper surface, the second vertical surface of the lower case can be in close contact with the inside of the vertical surface of the upper case.

In addition, the vertical surface of the upper case and the first vertical surface of the lower case may be formed on the same plane.

In addition, a cover may be further coupled to side regions on opposite sides of side regions formed on the upper case and the lower case and coupled to each other.

The cover may further include a vertical body contacting a vertical surface of the side regions of the upper case and a first vertical surface of the side regions of the lower case, an upper horizontal protrusion coupled to a horizontal surface of the side regions of the upper case, A lower horizontal projection coupled to the first horizontal surface of the side region, wherein the vertical body, the upper horizontal projection and the lower horizontal projection may be integrally formed.

In addition, the front region of the upper case includes a curved surface formed in the outward direction and a lower surface than the upper region, and a vertical surface that is bent downwardly extending from the curved surface, and corresponds to the curved surface and the vertical surface of the lower case The front region may include a horizontal surface extending outward and forming a surface higher than the lower region, and at least one locking hole may be formed on the curved surface and the horizontal surface.

In addition, an opening may be formed between the vertical plane and the horizontal plane, and the electrode tab of the polymer battery may be exposed to the outside through the opening.

In addition, the cover is further coupled to the side regions of the opposite sides of the upper case and the lower case, the cover may be further formed with a coupling protrusion coupled to the opening for a predetermined length.

In addition, the protection circuit board to which the electrode tab is coupled upright is positioned in front of the opening, and the opening and the locking hole, including the protection circuit board, may be molded with resin.

In addition, the cover may have an upper horizontal protrusion coplanar with the upper region of the upper cover, and a lower horizontal protrusion may coplanar with the lower region of the lower cover.

In addition, the polymer battery includes an encapsulated pouch having an insulating layer formed on both sides of a metal foil, an electrode assembly in which the positive electrode plate, the separator, and the negative electrode plate are stacked and wound in a plurality of times, and the pouch; It may include an electrolyte solution accommodated in the to allow the movement of lithium ions, and an electrode tab connected to the electrode assembly and exposed to the outside of the pouch.

In addition, an insulating member may be further interposed between the polymer battery and the metal case. The insulating member may be formed to surround the top, bottom and at least one side of the polymer battery. The insulating member may be an adhesive tape.

In addition, a cover may be further coupled to opposite sides of the metal case.

In addition, an insulation member may be further interposed between the cover and the metal case. The insulating member may be an adhesive tape.

As described above, the polymer battery pack according to the present invention further improves the strength, stability, and reliability of the battery by using a metal case instead of a plastic case as the exterior material of the polymer battery.

In addition, the polymer battery pack according to the present invention forms a plurality of locking holes in the opening and the periphery of the metal case, and the resin for molding the protective circuit board is filled in the polymer battery, the protective circuit board, the resin and the metal. Molding strength is further enhanced between the cases, thereby improving battery stability and reliability.

In addition, the polymer battery pack according to the present invention forms a plurality of steps in the metal case, and the steps are combined with each other in the up and down direction, so that the assembly is excellent and the thickness and width of the pack do not deviate from the standard specification.

In addition, the polymer battery pack according to the present invention further improves the strength, stability and reliability of the pack by bonding the covers to both sides of the metal case.

In addition, the polymer battery pack according to the present invention facilitates an assembly operation for accommodating the polymer battery into the metal case by using an integrated metal case instead of a separate type, thereby improving process reliability.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1 is a perspective view showing a polymer battery pack according to the present invention.

As illustrated, the polymer battery pack 100 according to the present invention includes a metal case 120 having a substantially flat hexahedron shape, two covers 150 coupled to opposite sides of the metal case 120, and the metal. And a resin 140 molding the front of the case 120 and the cover 150. As will be described later, a polymer battery is accommodated inside the metal case 120, and a protective circuit board electrically connected to the polymer battery is located inside the resin 140. In addition, one side of the resin 140 may be further attached to the immersion paper 143 that can determine whether the inundation, and the other side of the opening 141 of a predetermined size so that the terminal 131 of the protective circuit board is exposed to the outside Can be formed.

2 is a perspective view showing a state before the resin molding process in the polymer battery pack according to the present invention.

As shown in the polymer battery pack 100 according to the present invention, the protection circuit board 130 is placed upright in front of the metal case 120. Of course, the polymer battery accommodated in the metal case 120 and the protective circuit board 130 are electrically connected to each other. In addition, a plurality of locking holes 124a are further formed in front of the metal case 120 to further improve the mutual strength between the resin and the metal case 120 when the protective circuit board 130 is molded. . In addition, the cover 150 coupled to both sides of the metal case 120 also extends a predetermined length forward, so that the extended portion may be wrapped with a resin during molding.

3 is an exploded perspective view showing a polymer battery pack according to the present invention.

As shown, the polymer battery pack 100 according to the present invention includes a polymer battery 110 having a substantially flat hexahedral shape, a metal case 120 having a shape that substantially surrounds the polymer battery 110 from the top, bottom, and rear sides thereof. And a protective circuit board 130 that is positioned in front of the metal case 120 and electrically connected to the polymer battery 110, the protective circuit board 130, the metal case 120, and the cover 150. Resin 140 surrounding a portion of the metal and the cover 150 is coupled to the opposite sides of the metal case 120 and a predetermined region is wrapped with the resin 140. Although the resin 140 is illustrated as one object in FIG. 3, it is noted that this is actually formed by the resin molding process.

First, the polymer battery 110 may be a rechargeable lithium polymer battery in which a polymer electrolyte (or a liquid electrolyte may be accommodated) is accommodated, and an electrode tab 111 having a predetermined length is exposed in front. Of course, charging and discharging of the battery 110 are performed through the electrode tab 111.

The metal case 120 surrounds the polymer battery 110 at the top and bottom thereof so that the electrode tab 111 of the polymer battery 110 is exposed to the outside. The metal case 120 may be formed of an upper case 121, a lower case 125, and a rear connecting plate 120a that interconnects them. Here, the upper case 121 may be formed of an upper region 122 surrounding an approximately upper surface of the polymer battery 110 and a side region 123 surrounding approximately both sides of the polymer battery 110. In addition, a plurality of locking holes 124a may be formed in a region of the upper case 121 corresponding to a region where the electrode tab 111 of the polymer battery 110 is formed. In addition, the lower case 125 may include a lower region 126 surrounding the lower surface of the polymer battery 110 and a side region 127 surrounding approximately both side surfaces of the polymer battery 110. Here, a plurality of locking holes 128a may be formed in a region of the lower case 125 corresponding to a region where the electrode tab 111 of the polymer battery 110 is formed. In addition, the rear connecting plate 120a interconnects the rear of the upper case 121 and the lower case 125. Substantially, the rear connection plate 120a may be integrally formed with the upper case 121 and the lower case 125. Meanwhile, the metal case 120 including the upper case 121, the lower case 125, and the rear connecting plate 120a has strong strength and is not corroded, and is made of light steel, stainless steel (SUS), aluminum (Al), and copper. Cu, a metal alloy, or an equivalent thereof may be formed, but the material of the metal case 120 is not limited thereto. In addition, an insulation member 161 may be further interposed between the metal case 120 and the polymer battery 110 to prevent any possible electrical short. The insulating member 161 may be any one selected from a double-sided adhesive tape or an equivalent thereof, but the material is not limited thereto. As described above, the adhesive force between the polymer battery 110 and the metal case 120 may be further improved by the adhesive insulating member 161. In addition, the insulating member 161 may be formed in a substantially "⊃" shape, and may be formed to substantially surround the top, rear, and bottom surfaces of the polymer battery 110. Already shown wrapped around the polymer cell 110) Furthermore, a label " 162 " (not shown in Figs. 1 and 2) of approximately &quot; ⊃ &quot; shape is further attached to the surface of the metal case 120. Can be. Of course, the label 162 may be formed to substantially wrap the upper area of the upper case 121, the rear connecting plate 120a and the lower area of the lower case 125 of the metal case 120. Information on the battery pack manufacturer and various products may be recorded on the surface.

The protective circuit board 130 may be positioned in front of the polymer battery 110 and the metal case 120. Of course, the protective circuit board 130 is electrically connected to the electrode tab 111 of the polymer battery 110 through the electrode lead 132. Here, the insulating member 133 is further interposed between the electrode tab 111 and the metal case 120 of the polymer battery 110, so that the electrode tab 111 or the electrode lead 132 may be disposed in the metal case ( It is prevented from shorting to 120). Further, the electrode lead 132 is bent in a substantially "∩" shape, and another insulating member 134 is further interposed in the bent region. Therefore, the bent electrode lead 132 or the electrode tab 111 is not shorted to the protective circuit board 130. In addition, a plurality of electrode terminals 131 are formed on the front surface of the protective circuit board 130 to be electrically connected to an external set (not shown).

The resin 140 is actually formed by a transfer molding process. More specifically, the resin 140 may be formed by hot melt resin or an equivalent thereof, but the material is not limited thereto. The resin 140 not only surrounds the protective circuit board 130, but also the front regions of the electrode leads 132, the insulating members 133 and 134, the electrode tabs 111, the metal case 120, and the cover 150. To cover. Of course, the resin 140 is coupled to the locking holes 124a and 128a of the metal case 120, so that the bonding force between the resin 140 and the metal case 120 is significantly stronger. Accordingly, the polymer battery pack 110 may not be easily damaged by the protection circuit board 130 due to external shocks such as bending, twisting, and dropping. In addition, the connection state between the protective circuit board 130 and the electrode lead 132 and the connection state between the electrode lead 132 and the electrode tab 111 are not damaged. In addition, the protective circuit board 130 or the resin 140 may not be easily separated from the metal case 120. In addition, a plurality of openings 141 are formed in the front of the resin 140, and the electrode terminals 131 formed in the protective circuit board 130 are exposed to the outside through the openings 141. In addition, the resin 140 has a plurality of holes 142 formed at the front, and the holes 142 communicate with the circuit board 130. In addition, the immersion paper 143 may be further adhered to the surface of the plurality of holes 142. Therefore, it is possible to immediately check whether the moisture has penetrated toward the protective circuit board 130.

The cover 150 is coupled to approximately both sides of the metal case 120. Therefore, the coupling force of the metal case 120 (the upper case 121 and the lower case 125) is further improved by the cover 150. Furthermore, an insulating member 155 is preferably interposed between the cover 150 and the metal case 120, preferably a double-sided adhesive tape or an equivalent thereof, thereby providing adhesion between the cover 150 and the metal case 120. Is further improved. In addition, a protrusion 154 is formed at approximately the front of the cover 150, and the protrusion 154 and its surrounding area are surrounded by the resin 140 together. Therefore, the bonding force between the metal case 120, the resin 140, and the cover 150 is further increased. In the drawings, reference numeral 151 denotes a vertical body, 152 denotes an upper horizontal protrusion, and 153 denotes a lower horizontal protrusion, and the upper horizontal protrusion 152 and the lower horizontal protrusion 153 are respectively an upper case 121 and a lower case 125. Is coupled to.

Figure 4a is a perspective view showing a state before the metal case is completely folded of the polymer battery pack according to the present invention, Figure 4b is a perspective view showing a state after the metal case is completely folded, Figure 4c is an enlarged region 4c of Figure 4b. It is a perspective view shown.

As shown in FIGS. 4A and 4B, the metal case 120 may include an upper case 121, a lower case 125, and a rear connecting plate 120a. Of course, the upper case 121 and the lower case 125 is in the form of mutually coupled in the vertical direction. In addition, the upper case 121 has a relatively large area and covers an upper portion of the polymer battery, and the upper portion 122 is bent a predetermined length in the lower direction along the circumference from the upper region 122, thereby It consists of side regions 123 that cover approximately both sides. In addition, the lower case 125 has a relatively large area and covers a lower portion of the polymer battery, and the lower region 126 is bent a predetermined length upwardly along the circumference from the lower region 126, thereby It consists of side regions 127 that cover approximately the sides. In addition, the rear connecting plate 120a serves to interconnect the rear regions of the upper case and the lower case. Of course, the rear connecting plate 120a is bent in a substantially perpendicular direction with respect to the upper case 121 and the lower case 125. As described above, the rear connecting plate 120a may be integrally formed with the upper case 121 and the lower case 125. Accordingly, the upper case 121 and the lower case 125 have two side regions 123 and 127 coupled to each other, and the front region has a shape that is not coupled to each other. That is, the opening 129a is formed to expose the electrode tab of the polymer battery through the front of the metal case 120, and the plurality of locking holes 124a and 128b are formed to improve the bonding force with the resin. Formed.

As shown in FIG. 4C, a curved surface 124c extending outwardly in a lower direction than the upper region 122 is formed at an approximately front of the upper case 121 of the metal case 120, and the curved surface is formed. Bending downward from 124c, a vertical surface 124d of a predetermined length is formed. In addition, the front surface of the lower case 125 of the metal case 120 has a horizontal surface 128b that is higher than the lower region 126 and extends a predetermined length in an outward direction. In addition, since the vertical surface 124d of the upper case 121 and the horizontal surface 128b of the lower case 125 are not coupled to each other, an opening 129a having a predetermined size is formed therebetween. Therefore, it can be seen that the electrode tab of the polymer battery is exposed to the outside of the metal case 120 through the opening 129a. In addition, a plurality of locking holes 124a and 128a are formed in the curved surface 124c of the upper case 121 and the horizontal surface 128b of the lower case 125, respectively. Accordingly, the resin is bonded to the locking holes 124a and 128a, thereby improving the bonding strength and the bonding strength between the metal case 120 and the resin.

5A is a cross-sectional view taken along line 5a-5a of FIG. 1, FIG. 5B is a cross-sectional view taken along line 5b-5b in FIG. 1, and FIG. 5C is a cross-sectional view taken along line 5c-5c in FIG.

First, as shown in FIG. 5A, the metal case 120 includes an upper case 121, a lower case 125, and a rear connecting plate 120a.

The upper case 121 includes an upper region 122 that substantially covers an upper portion of the polymer battery 110.

In addition, the lower case 125 includes a lower region 126 that substantially covers the lower portion of the polymer battery 110.

In addition, the rear connecting plate 120a interconnects an end portion of the upper region 122 of the upper case 121 and an end portion of the lower region 126 of the lower case 125. In addition, the rear connecting plate 120a is bent at right angles to the upper region 122 of the upper case 121 and the lower region 126 of the lower case 125, respectively. Of course, this does not limit the shape of the rear connecting plate 120a in the form of bending at right angles. Naturally, the rear connecting plate 120a may have a bending angle or a predetermined step, depending on the shape of the polymer battery or the design of the pack.

In addition, the polymer battery 110 is housed inside the metal case 120 including the upper case 121, the lower case 125, and the rear connecting plate 120a. It includes a pouch 112, an electrode assembly 113, and an electrolyte (not shown). The pouch 112 has an insulating layer 112b and 112c formed on and under the metal foil 112a in the middle. The metal foil 112a is usually aluminum, stainless steel, or an equivalent thereof. In addition, the insulating layer 112b formed on the upper surface of the metal foil 112a may be nylon, polyethylene terephthalate (PET), or an equivalent thereof. The insulating layer 112c formed on the lower surface of the metal foil 112a may be a modified poly. Propylene (CPP) or equivalents thereof are possible. However, the material of the metal foil 112a and the insulating layers 112b and 112c is not limited thereto. In addition, the electrode assembly 113 includes a positive electrode plate 113a, a separator 113b, and a negative electrode plate 113c. The positive electrode plate 113a is formed by coating a positive electrode active material (lithium metal oxide, etc.) on both sides of, for example, an aluminum foil, and the negative electrode plate 113c is, for example, a copper foil. The negative electrode active material (carbon type) may be coated on both surfaces. In addition, the separator 113b may be formed of porous polypropylene (PP) or porous polyethylene (PE) material so that lithium ions may pass through the positive electrode plate 113a and the negative electrode plate 113c.

On the other hand, the upper region 122 of the pouch 112 and the upper case 121, the lower region 126 of the pouch 112 and the lower case 125, the rear region and the rear connecting plate of the pouch 112 An insulating member 161 such as a double-sided adhesive tape may be interposed between the 120a to improve the bonding force between the pouch 112 and the metal case 120.

Subsequently, as shown in FIG. 5B, the protective circuit board 130 is connected to the electrode tab 111 of the polymer battery 110 through an electrode lead 132 that is bent in a substantially “∩” shape. In addition, an insulating member 134 is interposed between the bent regions of the electrode leads 132, and another insulating member 133 is also disposed between the electrode tab 111 and the upper case 121 of the metal case 120. Intervened. In addition, the protective circuit board 130, the electrode lead 132, the electrode tab 111, and the front region of the insulating members 133 and 134 and the metal case 120 are all molded with the resin 140. For example, it is molded with hot melt resin. Of course, the resin 140 is also filled in the locking holes 124a and 128a formed in the upper case 121 and the lower case 125 of the metal case 120, thereby forming the resin 140 and the metal case 120. The bonding force is further improved. Of course, during the molding process, the resin 140 also penetrates into the inside through the opening 129a provided in the metal case 120, so that the resin 140 adheres to a predetermined region of the pouch 112. In addition, an electrode terminal 131 is formed in front of the protection circuit board 130, which is exposed to the outside through the opening 141 of the resin 140, so that the electrode terminal 131 is easy to the external system. To be electrically coupled.

Subsequently, as illustrated in FIG. 5C, the upper case 121 of the metal case 120 further includes a side region 123 covering both sides, in addition to an upper region 122 covering an upper portion of the polymer battery 110. . The side region 123 of the upper case 121 is lower than the upper region 122 and has a horizontal surface 123a extending outward and a vertical surface 123b bent and extended downward from the horizontal surface 123a. Consists of

In addition, the lower case 125 of the metal case 120 includes a side region 127 covering both sides, in addition to a lower region 126 covering the lower portion of the polymer battery 110. Of course, the rear region of the polymer battery 110 has been described above that the rear connecting plate 120a of the metal case 120 is covered.

The side region 127 of the lower case 125 will be described in more detail. The lower case 125 is higher than the lower region 126 and extends in the outward direction, and the first horizontal plane 127a extends in the outward direction. A first vertical plane 127b that is bent upward from the first horizontal plane 127a, a second horizontal plane 127c that is bent inwardly extending from the first vertical plane 127b, and the second horizontal plane 127c ) And a second vertical surface 127d that is bent upwards from.

Here, the second vertical surface 127d of the lower case 125 is coupled to the inside of the vertical surface 123b of the upper case 121, so that the upper case 121 and the lower case 125 are integral with the metal case ( 120). In addition, the vertical surface 123b of the upper case 121 and the first vertical surface 127b of the lower case 125 form a mutual plane so that there is no excessively exposed portion on the side of the metal case 120. It is.

On the other hand, both sides of the upper case 121 and the lower case 125 constituting the metal case 120 is further coupled to the cover 150 of approximately "⊂" or "⊃" shape. The cover 150 may be formed of any one selected from plastic, metal, or equivalents thereof, but the material is not limited thereto. In addition, the cover 150 includes a vertical body 151, an upper horizontal protrusion 152, and a lower horizontal protrusion 153. Of course, the cover 150 is also formed with a projection coupled to the resin 140, which is not shown in Figure 5c (see Figure 3).

The vertical body 151 may be formed on the vertical surface 123b of the side regions 123 of the upper case 121 and the first vertical surface 127b of the side regions 127 of the lower case 125, such as a double-sided adhesive tape. It is bonded by the insulating member 155. In addition, the upper horizontal protrusion 152 is coupled to the horizontal surface 123a of the side region 123 of the upper case 121. In addition, the lower horizontal protrusion 153 is coupled to the first horizontal plane 127a of the side region 127 of the lower case 125.

Moreover, the outer surface of the upper horizontal protrusion 152 of the cover 150 and the outer surface of the upper region 122 of the upper case 121 are approximately the same plane. In addition, the outer surface of the lower horizontal protrusion 153 of the cover 150 and the outer surface of the lower region 126 of the lower case 125 form the same plane. Therefore, since the upper horizontal protrusion 152 and the lower horizontal protrusion 153 of the cover 150 do not protrude to the outside of the metal case 120, the size of the polymer battery pack 100 according to the present invention is The standard specification is satisfied.

As described above, the polymer battery pack according to the present invention further improves the strength and stability of the battery by using a metal case instead of a cover as the exterior material of the polymer battery.

In addition, the polymer battery pack according to the present invention forms a plurality of locking holes in the openings and the periphery of the metal case, and the resin for molding the protective circuit board is filled therein, so that the protective circuit board and the resin and the metal case are filled with each other. The bonding force is further strengthened, thereby improving the stability of the battery.

In addition, the polymer battery pack according to the present invention forms a plurality of steps in the metal case, and the steps are combined with each other in the up and down direction, so that the assembly is excellent and the thickness and width of the pack do not deviate from the standard specification.

In addition, the polymer battery pack according to the present invention further improves the strength and stability of the pack by coupling the covers to both sides of the metal case.

In addition, the polymer battery pack according to the present invention facilitates an assembly operation for accommodating the polymer battery into the metal case by using an integrated metal case instead of a separate type, thereby improving process reliability.

What has been described above is just one embodiment for carrying out the polymer battery pack according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the gist of the present invention Without departing from the scope of the present invention, any person having ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (34)

A polymer battery formed by exposing an electrode tab to one side; A metal case surrounding the polymer battery, wherein the electrode tab of the polymer battery is exposed to the outside; In the polymer battery pack comprising a protective circuit board connected to the electrode tab exposed through the metal case, The metal case includes an upper case surrounding the top and both sides of the polymer battery, a lower case surrounding the bottom and the both sides of the polymer battery, and a back side of the polymer battery and interconnecting the rear of the upper case and the lower case. Polymer battery pack, characterized in that consisting of a rear connecting plate. The polymer battery pack according to claim 1, wherein the rear connecting plate is integrally formed with the upper case and the lower case and bent at a right angle from the upper case and the lower case. The polymer battery pack as claimed in claim 1, wherein the upper case and the lower case are coupled to each other in an up and down direction via the polymer battery. The polymer battery pack according to claim 1, wherein an opening is formed through the front of the upper case and the lower case, and the electrode tab of the polymer battery is exposed through the opening. The polymer battery pack as claimed in claim 4, wherein the protection circuit board is positioned outside the opening of the metal case. The polymer battery pack as claimed in claim 5, wherein the protective circuit board is molded in a resin and fixed to the metal case. The polymer battery pack as claimed in claim 4, wherein the metal case has at least one locking hole formed in front of the metal case, and the opening, the locking hole, and the protective circuit board are molded and wrapped with a resin. The method of claim 7, wherein a cover is further coupled to opposite sides of the metal case, and a protrusion protruding inward is further formed on the cover adjacent to the opening, and the protrusion is molded with the resin. Polymer battery pack. The polymer battery pack as claimed in claim 1, wherein the metal case is formed of any one selected from steel, stainless steel (SUS), aluminum (Al), copper (Cu), or a metal alloy. The polymer battery pack according to claim 1, wherein an insulating member is further interposed between the electrode tab of the polymer battery and the metal case so that the electrode tab is not shorted to the metal case. The polymer battery pack as claimed in claim 10, wherein the insulating member is molded with a resin together with a protective circuit board. The method of claim 1, wherein the protective circuit board is formed with an electrode lead coupled to the electrode tab of the polymer battery, the electrode lead is bent and welded to the electrode tab, the insulating member between the bent electrode lead A polymer battery pack further characterized by. The polymer battery pack as claimed in claim 12, wherein the insulating member is molded with a resin together with the protective circuit board. The polymer battery pack as claimed in claim 1, wherein a label is attached to a surface of the metal case. The polymer battery pack as claimed in claim 14, wherein the label is formed to surround the upper case, the lower case and the rear connecting plate of the metal case. The polymer battery pack as claimed in claim 1, wherein at least one electrode terminal is formed in the protective circuit board, and the entire region except the electrode terminal is molded with a resin. 17. The polymer battery pack as claimed in claim 16, wherein at least one hole is formed in the resin to communicate with the protection circuit board, and the immersion paper is further adhered to the surface of the hole to determine whether moisture has penetrated. . The method of claim 1, wherein the metal case The upper case of the metal case includes an upper region of a predetermined width and a side region bent downward from both sides of the upper region; The lower case of the metal case includes a lower region of a predetermined width and a side region bent in an upward direction from both sides of the lower region, And a side region of the upper case and a side region of the lower case of the metal case are coupled to each other. 19. The apparatus of claim 18, wherein the side region of the upper case includes a horizontal surface lower than the upper region and extending outward, and a vertical surface bent downward from the horizontal surface. The side region of the lower case is higher than the lower region and at the same time extends outwardly, a first vertical surface that is bent upwardly from the first horizontal plane, and is bent inwardly from the first vertical surface. An extended second horizontal plane and a second vertical plane bent upwardly from the second horizontal plane, The polymer battery pack, characterized in that the second vertical surface of the lower case is in close contact with the inside of the vertical surface of the upper case. 20. The polymer battery pack according to claim 19, wherein the vertical surface of the upper case and the first vertical surface of the lower case are formed on the same plane. 20. The polymer battery pack according to claim 19, wherein a cover is further coupled to opposite side regions of the side regions formed on the upper case and the lower case and coupled to each other. The method of claim 21, wherein the cover A vertical body in contact with a vertical surface of the side regions of the upper case and a first vertical surface of the side regions of the lower case; An upper horizontal protrusion coupled to a horizontal surface of the side region of the upper case; A lower horizontal protrusion coupled to a first horizontal plane of the side regions of the lower case; The vertical body, the upper horizontal projections and the lower horizontal projections, the polymer battery pack, characterized in that formed integrally. 20. The method of claim 19, wherein the front region of the upper case comprises a curved surface formed in the outward direction and a lower surface than the upper region, and a vertical surface bent in a downward direction from the curved surface, The front region corresponding to the curved surface and the vertical surface of the lower case includes a horizontal surface extending outward and forming a surface higher than the lower region, At least one locking hole is formed in the curved surface and the horizontal surface. The polymer battery pack as claimed in claim 23, wherein an opening is formed between the vertical plane and the horizontal plane, and the electrode tab of the polymer battery is exposed to the outside through the opening. 25. The method of claim 24, wherein the cover is further coupled to the side regions of the opposite sides of the upper case and the lower case, The cover of the polymer battery pack, characterized in that the coupling protrusion further coupled to the opening in a predetermined length. 25. The polymer battery pack as claimed in claim 24, wherein a protective circuit board to which the electrode tab is coupled is erected in front of the opening, and the opening and the locking hole are molded of resin, including the protective circuit board. 23. The polymer battery pack of claim 22, wherein the cover has an upper horizontal protrusion coplanar with an upper region of the upper cover, and a lower horizontal protrusion coplanar with the lower region of the lower cover. The method of claim 1, wherein the polymer battery A pouch in the form of a bag having an insulating layer formed on both sides of the metal foil, An electrode assembly in which a cathode electrode plate, a separator, and a cathode electrode plate are stacked and wound at the same time and stored in the pouch; An electrolyte solution accommodated in the pouch to allow movement of lithium ions; And an electrode tab connected to the electrode assembly and exposed to the outside of the pouch. The polymer battery pack as claimed in claim 1, wherein an insulating member is further interposed between the polymer battery and the metal case. 30. The polymer battery pack as claimed in claim 29, wherein the insulating member is formed to surround the top, bottom, and at least one side of the polymer battery. 30. The polymer battery pack according to claim 29, wherein said insulating member is an adhesive tape. The polymer battery pack according to claim 1, wherein a cover is further coupled to opposite sides of the metal case. 33. The polymer battery pack according to claim 32, wherein an insulating member is further interposed between the cover and the metal case. 34. The polymer battery pack according to claim 33, wherein said insulating member is an adhesive tape.

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