CN102074675B - Protection circuit module for secondary batteries and battery pack provided with protection circuit module - Google Patents

Abstract

The invention provides a protection circuit module for a secondary battery and a battery pack with the protection circuit module. In one embodiment, the protection circuit module includes a mounting base and at least one connection member on one side of the mounting base. The connection member is provided with: a first layer having a first surface; a second layer having a second surface opposite to the first surface; and at least one spacer separating the first surface and the second surface from each other.

Description

Protection circuit module for secondary battery and battery pack having same

This application claims U.S. Provisional Application No. 61/264,638, filed with the USPTO on November 25, 2009, and U.S. Nonprovisional Application No. 12/851,450, filed with the USPTO on August 5, 2010 Priority, the entire disclosures of these applications are hereby incorporated by reference.

technical field

An aspect of the present invention relates to a protection circuit module of a secondary battery.

Background technique

A secondary battery is a battery that can be repeatedly charged and discharged. The secondary battery is classified into a nickel-cadmium (Ni-Cd) secondary battery, a nickel-metal hydride (Ni-MH) secondary battery, a lithium secondary battery, and the like. Lithium secondary batteries are classified into lithium ion secondary batteries using liquid electrolytes and lithium polymer secondary batteries using polymer electrolytes according to the type of electrolyte used. In addition, lithium secondary batteries are classified into a prismatic type, a cylindrical type, a pouch type, and the like according to shapes.

A battery pack using a lithium secondary battery generally includes a bare cell and a protection circuit module. A bare cell means a structure including an electrode assembly, an electrolyte, and a case accommodating the electrode assembly and the electrolyte. When the bare cell is charged or discharged, the protection circuit module protects the bare cell from overcharging or overdischarging.

Contents of the invention

According to aspects of the present invention, there is provided a protection circuit module for a secondary battery, the protection circuit module having a connection member for making the protection circuit module easy to connect to a bare cell, so that a battery including the above-mentioned protection circuit module Battery packs have improved productivity and yield.

According to an embodiment of the present invention, a protective circuit module for a secondary battery includes a base and a connecting member on the base, the connecting member includes: a first layer; a second layer; a spacer on the first layer and the second layer and separate the first layer from the second layer.

In one embodiment, the connection member is bonded to the base and is configured to be electrically connected to a tab of the secondary battery, wherein the tab includes an electrode tab of the secondary battery or a PTC wire electrically connected to an electrode terminal of the battery pack. piece.

In one embodiment, the spacer is bonded to at least one of the first layer and the second layer, the spacer may be threaded into a groove in the second layer or the spacer may be integral with the first layer. In addition, the protective circuit module may include at least one additional spacer between the first layer and the second layer, one of the at least one additional spacer and the spacer face each other and are positioned to contact each other.

In one embodiment, the area of the first layer is smaller than the area of the second layer, wherein the spacer extends from the edge of the first layer towards the second layer. The connection member may further include a connection part that joins the first layer and the second layer together, and such a connection part may be integral with the first layer and the second layer.

In another embodiment of the present invention, a battery pack is provided, the battery pack has: a bare cell, including an electrode assembly; a lug, electrically connected to the bare cell; a protection circuit module, electrically connected to the bare cell The core, the protection circuit module includes a substrate and a connection member electrically coupled to the lug on the substrate, wherein the connection member has a first layer, a second layer and a spacer, the spacer is between the first layer and the second layer and makes The first layer is spaced apart from the second layer, wherein the tab is between the first layer and the second layer.

Description of drawings

The drawings illustrate exemplary embodiments of the invention and together with the description serve to explain principles of the invention.

FIG. 1 is a schematic perspective view of a protection circuit module for a secondary battery according to an embodiment of the present invention.

Fig. 2 is a front view of the connecting member in Fig. 1 .

FIG. 3A is a perspective view of a connection member of a protection circuit module according to another embodiment of the present invention.

3B is a cross-sectional view of a connection member of a protection circuit module according to yet another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a connection member of a protection circuit module according to yet another embodiment of the present invention.

5 is a cross-sectional view of a connection member of a protection circuit module according to yet another embodiment of the present invention.

FIG. 6 is a perspective view of a connection member of a protection circuit module according to still another embodiment of the present invention.

7A and 7B are perspective views of connection members of a protection circuit module according to still another embodiment of the present invention.

FIG. 8 is a perspective view of a protection circuit module according to yet another embodiment of the present invention.

Fig. 9 is a front view of the connecting member in Fig. 8 .

FIG. 10 is a perspective view of a battery pack according to an embodiment of the present invention.

FIG. 11 is an exploded view of the battery pack of FIG. 10 .

FIG. 12 is a cross-sectional view of the battery pack of FIG. 10 .

FIG. 13 is a perspective view illustrating a main manufacturing process of the battery pack of FIG. 10 .

FIG. 14 is an exploded view of a battery pack according to another embodiment of the present invention.

Detailed ways

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

Where functions and constructions are well known in the relevant art, further discussion will not be made in the detailed description of the present invention for the sake of clarity. In the drawings, the same reference numerals denote the same elements throughout. Also, the thickness or size of layers or regions are exaggerated for convenience of description and clarity. For ease of illustration, elements are appropriately projected in the drawings.

FIG. 1 is a schematic perspective view of a protection circuit module for a secondary battery according to an embodiment of the present invention. Fig. 2 is a front view of the connecting member in Fig. 1 .

Referring to FIG. 1 , the protection circuit module 50 includes a mounting base 10 and a connection member 20 at one side or surface of the mounting base 10 . The protection circuit module 50 may be provided with a conductive layer 30 to be electrically connected to electronic components separated from the mounting substrate 10 . Another connection member 20 may be connected to the conductive layer 30 .

The mounting base 10 is provided with a predetermined conductive pattern (not shown), which may include a conductive layer 30 . One or more electronic components controlling voltage or current in charging/discharging of the secondary battery may be mounted on the mounting base 10 .

As shown in Figure 2, the connection member 20 includes: a first layer 21, which is provided with a first surface 211; a second layer 22, which is provided with a second surface 221; a spacer 23, which makes the first surface 221 and the second surface 221 mutually separated.

Both the first layer 21 and the second layer 22 may be substantially planar plates. In this embodiment, the spacer 23 is used to bond the first layer 21 and the second layer 22 to each other. That is, the spacer 23 is provided to support the first layer 21 on the second layer 22 connected to the mounting base 10 while spacing the first layer 21 and the second layer 22 from each other.

In consideration of durability and electrical conductivity of the first layer 21 , the second layer 22 and the spacer 23 , nickel or a nickel alloy may be used as a material of each of the first layer 21 , the second layer 22 and the spacer 23 .

The connection member 20 is bonded to one surface of the mounting base 10 . For example, the connection member 20 may be bonded to the surface of the mounting substrate 10 through a reflow soldering process. In the reflow soldering process, solder paste is applied to a corresponding portion of the mounting substrate 10 (a portion where the conductive pattern is formed on the conductive layer 30 ), and then the solder paste is melted by applying heat, thereby performing soldering. The connection member 20 bonded to one surface of the mounting base 10 may be electrically connected to an external terminal (see reference numeral 155 in FIG. 11 ) on the other surface of the mounting base 10 through a conductive pattern in the mounting base 10 .

The connection member 20 is electrically connected to the tabs of the bare cells. An electrode lug will be used as an example here, however it should be understood that the lug could also be a positive temperature coefficient (PTC) lug or part of any other lug or material that needs to be electrically connected to the protection circuit module. In one embodiment, the connecting member 20 is arranged so that the tabs of the bare cells are inserted or fitted between the first layer 21 and the second layer 22 through the opening 29 .

In one embodiment, the connection member 20 of this embodiment is used to connect the electrode tabs of the bare cells to the external terminals. The connection member 20 has a design of a non-bending structure, so that its bonding process with the electrode tab is easily performed. In the present embodiment, the non-bent structure means a structure in which the connection member 20 is not bent when the electrode tab is bonded to the connection member 20 . For example, a non-bending structure is a structure in which, when an electrode tab is bonded to a connection member by a process such as welding, a part of the connection member does not need to be bent to surround the electrode tab in a sandwich form, thereby welding the electrode tab. to the connecting components.

According to the present embodiment, since the movement of the electrode tab is restricted by interposing the electrode tab between the first layer and the second layer, the electrode tab is not easily separated from the welded portion of the electrode tab. Therefore, a bonding process requiring precise operations due to the structures of the small electrode tabs and the small connection members can be performed very quickly and accurately. In addition, the bonding strength is increased by the sandwich structure of the electrode tab and the connection member, thereby improving the durability and reliability of the protection circuit module and the battery pack using the protection circuit module.

Hereinafter, various embodiments of the connecting member of the present embodiment will be described in more detail below.

FIG. 3A is a perspective view of a connection member of a protection circuit module according to another embodiment of the present invention.

Referring to FIG. 3A, the connection member 20a includes a first layer 21, a second layer 22a, a spacer 23a, and a connection part 24a. In the present embodiment, the first layer 21a and the second layer 22a have a two-layer structure facing each other and being separated from each other at a predetermined interval. The first layer 21a and the second layer 22a are supported by the spacer 23a and the connection portion 24 and are electrically connected to each other through the spacer 23a and the connection portion 24a.

The spacer 23a may be formed as a protrusion protruding from the first layer 21a or the second layer 22a. The spacer 23a may have a shape of a cylinder, a hemisphere, a prism, or the like. The spacer 23a may be bonded to any one of the first layer 21a and the second layer 22a.

The connecting portion 24a is provided to bond one side of each of the first layer 21a and the second layer 22a to each other. The connecting portion 24a may be provided to bond the entire sides or a part of the sides of the first layer 21a and the second layer 22a corresponding to each other and facing each other. The connecting portion 24a may be formed of the same material as that of the spacer 23a.

In the connecting member 20a of the present embodiment, although the space between the first layer 21a and the second layer 22a is maintained by the spacer 23a, the first layer 21a and the second layer 22a can be firmly bonded to each other by the connecting portion 24a , and can enhance the electrical conductivity between the first layer 21a and the second layer 22a.

3B is a cross-sectional view of a connection member of a protection circuit module according to yet another embodiment of the present invention. FIG. 3B may correspond to the predetermined section of FIG. 3A except for the connection structure of the spacer and the second layer.

Referring to FIG. 3B, the connection member 20b includes a first layer 21b, a second layer 22b, a spacer 23b and a connection part 24b. The first layer 21b, the second layer 22b and the connection part 24b are substantially the same as the first layer 21a, the second layer 22a and the connection part 24a described with reference to FIG. 3A.

The spacer 23b may have a shape of a bolt or a screw. The spacer 23b is threadably engaged to the nut portion or slot 25 of the second layer 22b. According to this embodiment, the spacer 23b may be positioned between the first layer 21b and the second layer 22b after the spacer is prepared as a separate component. It should be understood that this structure of the spacer 23b is applicable to the spacer 23 described with reference to FIG. 2 .

FIG. 4 is a cross-sectional view of a connection member of a protection circuit module according to yet another embodiment of the present invention.

Referring to FIG. 4, the connection member 20c includes a first layer 21c, a second layer 22c, a spacer 23c and a connection part 24c. As shown, connecting member 20c may be a single integral component.

In the present embodiment, the first layer 21c and the second layer 22c have a shape formed by bending a single member into substantially the Korean alphabet shape or a substantially square "C" shape to form the structure. The connecting portion 24c corresponds to a corresponding portion of a single member bent twice to form the first layer 21c and the second layer 22c, that is, the portion between the bent portions of the single member. The spacer 23c is a protruding portion that protrudes in an embossed shape from the first layer 21c.

The spacer 23c protrudes from the first layer 21c toward the second layer 22c, the end of the spacer 23c is configured to contact the second layer 22c, however the end of the spacer 23c need not be in continuous contact with the second layer 22c, or may No contact with the second layer at all. A concave portion 26 corresponding to the protruding portion is provided on the other surface of the first layer 21c (ie, the surface opposite to the surface on which the spacer 23c protrudes).

In the spacer of this structure, since the above-mentioned protruding portion is provided with a corresponding concave portion, the above-mentioned protruding portion may be different from the aforementioned protrusion.

According to the present embodiment, the spacer 23c having the protruding portion is formed at a part of the first layer 21c of the single member, and the single member is The shape is curved so that the connecting member 20c can be manufactured very easily. It should be understood that the structure of the protruding portion in the spacer 23c can be applied to the spacer described with reference to FIG. 2 or FIG. 3A.

5 is a cross-sectional view of a connection member of a protection circuit module according to yet another embodiment of the present invention.

Referring to FIG. 5, the connection member 20d includes a first layer 21d, a second layer 22d, a first spacer 231d, a second spacer 232d, and a connection portion 24d. Similar to connecting member 20c, connecting member 20d may be a single integral component.

The first spacer 231d is provided to protrude from the first layer 21d toward the second layer 22d. The second spacer 232d is provided to protrude from the second layer 22d toward the first layer 21d. In one embodiment, the first spacer 231d and the second spacer 232d are disposed opposite to each other.

In the present embodiment, the connection member 20d is substantially the same as the connection member 20c described with reference to FIG. 4 except that the first spacer 231d and the second spacer 232d correspond to one spacer 23c.

It should be understood that the structures of the first spacer 231d and the second spacer 232d of the present embodiment may be applied to the spacers described with reference to FIG. 2 or FIG. 3A .

FIG. 6 is a perspective view of a connection member of a protection circuit module according to still another embodiment of the present invention.

Referring to FIG. 6, the connection member 20e includes a first layer 21e, a second layer 22e, a spacer 27 and a connection part 24e.

In this embodiment, the area of the first layer 21e is smaller than the area of the second layer 22e. The first layer 21e, the second layer 22e, and the connecting portion 24e may be integrally formed as a single member.

The spacer 27 is provided as an extended portion bent approximately vertically or perpendicularly from one side surface of the first layer 21e toward the second layer 22e. One end of the spacer 27 is configured to be in contact with one surface of the second layer 22e. The spacer 27 may be integrally formed with the first layer 21e. In another embodiment, if the spacer 27 is a separate member, the spacer 27 may be bonded to the first layer 21e to protrude from the one side surface of the first layer 21e.

According to the present embodiment, the area of the first layer 21e is formed smaller than that of the second layer 22e, so that the electrode tab can be efficiently inserted between the first layer 21e and the second layer 22e. For example, the electrode tab may be inserted into the connection member 20e through an opening formed between the first layer 21e and the second layer 22e by sliding the electrode tab along one surface of the second layer 22e. According to the present embodiment, movement of the electrode tab in an unintended direction between the first layer 21e and the second layer 22e is restricted.

7A and 7B are perspective views of connection members of a protection circuit module according to still another embodiment of the present invention.

Referring to FIG. 7 , the connecting member 20 f includes a first layer 21 f , a second layer 22 f and a spacer 28 .

In this embodiment, the area of the first layer 21f is smaller than the area of the second layer 22f. The first layer 21f and the second layer 22f may be formed as separate members.

The spacer 28 may be formed as a side connection portion connecting side surfaces of the first layer 21 f and the second layer 22 f corresponding to each other. The side connecting portion differs from the connecting portions 24a, 24b, 24c, 24d, and 24e of the preceding embodiments in that the side connecting portion is formed on one side surface in the widthwise or lengthwise direction of the connecting member 20f. The spacer 28 may be formed along all of a pair of side surfaces of the first layer 21f and the second layer 22f corresponding to each other or along a part of the side surfaces of the first layer 21f and the second layer 22f.

As a modification of this embodiment, the connecting member 20g may further include any one of the spacers 23g among the spacers according to the foregoing embodiments. For example, the spacer 23g may be formed in the shape of a protrusion or a protrusion.

FIG. 8 is a perspective view of a protection circuit module for a secondary battery according to still another embodiment of the present invention. Fig. 9 is a front view of the connection member of Fig. 8 .

8 and 9, the protection circuit module 50a includes: a mounting base 10a; a plurality of connecting members 20h located on one side of the mounting base 10a; electronic components 41, 42 and 43 located on one side of the mounting base 10a. Each of the electronic components 41, 42, and 43 may include switching elements, control circuits, resistors, capacitors, and the like.

The mounting substrate 10a may be the same as the mounting substrate 10 described with reference to FIG. 1 except for the form of the conductive pattern. For example, the mounting substrate 10a may be embodied as a printed circuit board on which a conductive line pattern is formed.

The connecting member 20h includes a first layer 21h, a second layer 22h, two spacers 23h, and a connecting portion 24h. Individual components can be The shape is bent to form the first layer 21h, the second layer 22h and the connection portion 24h of the connection member 20h.

In the present embodiment, the area of the first layer 21h of the connection member 20h is smaller than the area of the second layer 22h. For example, the second layer 22h may be formed in a flat plate shape having a length and a width of about 1.5 mm and about 1.0 mm, respectively. The first layer 21h may be formed in a flat plate shape having a length and a width of about 1.5 mm and about 0.90 mm, respectively.

Both spacers 23h may be provided as hemispherical protrusions protruding from the first layer 21h toward one surface of the second layer 22h. Two spacers 23h are located adjacent to both edges in the width direction of the connection member 20h (or the length direction of the mounting base 10a), respectively. In this embodiment, two spacers 23h are integrally formed with the first layer 21h.

The distance between the first layer 21h and the second layer 22h or the height L of the opening 29 may be between about 0.05mm and about 0.4mm. The height L of the opening 29 substantially corresponds to the thickness of the electrode tab. The height L of the opening 29 is set to be slightly larger than the thickness of the electrode tab so that the electrode tab can be inserted between the first layer 21h and the second layer 22h through the opening 29 .

Electrical connection between the connection member 20h and the electrode tab (see reference numeral 134 in FIG. 11 and reference numeral 135 in FIG. 13 ) may be performed by a welding process (eg, resistance welding) in consideration of external impact and the like.

In one embodiment, the welding strength between the connection member 20h and the electrode tab is between about 2.75kgf and about 2.85kgf. Considering that the welding strength between the single-layer connection member and the electrode tab is between about 2.25 kgf and about 2.35 kgf in the comparative example, it can be seen that the welding strength of the present embodiment is enhanced compared with that of the comparative example.

As described above, the connection member 20h of the protective circuit module 50a according to the present embodiment is provided so as to surround the electrode tab while having a non-bending structure, so that the welding process between the connection member and the electrode tab can be very simple and can enhance Welding strength between connecting member and electrode lug.

FIG. 10 is a perspective view of a battery pack according to an embodiment of the present invention. FIG. 11 is an exploded view of the battery pack of FIG. 10 . FIG. 12 is a cross-sectional view of the battery pack of FIG. 10 .

10 to 12, the battery pack 100 includes: a bare battery cell 110; a housing frame 140 surrounding the bare battery cell 110; a protection circuit module 150 electrically connected to the bare battery cell 110 and fixed to the housing frame 140; a cover 160 fixed to to the receiving frame 140 and surrounds the protection circuit module 150 at the same time. The battery pack 100 may further include an outer label 170 to surround the bare cells and the receiving frame 140 . Water sensitive paper 180 may be provided on the cover 160 .

The bare cell 110 includes a bag-type case 120 , an electrode assembly 130 and an electrolyte accommodated inside the case 120 .

The housing 120 is provided with a first surface 121 and a second surface 122 having two wide areas corresponding to each other, and four surfaces for connecting the first surface 121 and the second surface 122 having relatively narrow areas (ie, third surface 123, fourth surface 124, fifth surface 125 and sixth surface 126). The third surface 123 among the four surfaces corresponds to the front surface through which the two electrode tabs 134 and 135 are drawn out.

The electrode assembly 130 is formed by sequentially stacking or winding the positive electrode plate 131 , the separator 133 and the negative electrode plate 132 . One end of each of the two electrode tabs 134 and 135 is respectively attached to the positive plate 131 and the negative plate 132, and the other end of each of the two electrode tabs 134 and 135 extends to the The exterior of the electrode assembly 130 . A solid electrolyte or a gel electrolyte may be used as the electrolyte.

The positive electrode plate 131 includes a sheet-shaped positive electrode collector and a positive electrode active material coated on the positive electrode collector. The negative plate 132 includes a sheet-shaped negative current collector and a negative active material coated on the negative current collector.

The positive active material may include transition metal oxides including lithium and lithium chalcogenides. Here, the transition metal oxide containing lithium is typically, for example, LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , or LiNi _1-xy Co _x M _y O ₂ (here, 0≤x≤1, 0≤y≤ 1, 0≦x+y≦1 and M is a metal oxide such as Al, Sr, Mg or La). The negative electrode active material may be a carbon material (eg, crystalline carbon, amorphous carbon, carbon composite material, or carbon fiber), metallic lithium, or a lithium alloy.

The positive electrode current collector and the negative electrode current collector may be formed of one material selected from the group consisting of stainless steel, nickel, copper, aluminum, and alloys thereof. In order to maximize efficiency, a positive electrode collector may be formed of aluminum or an aluminum alloy, and a negative electrode current collector may be formed of copper or a copper alloy.

The separator 133 is located between the positive electrode plate 131 and the negative electrode plate 132 . The separator 133 is provided to prevent an electrical short circuit between the positive electrode plate 131 and the negative electrode plate 132 and to allow movement of lithium ions. The separator 133 may be formed of a polyolefin-based polymer film such as polyethylene (PE), polypropylene (PP), or a multilayer film thereof.

The receiving frame 140 is a rectangular frame structure having a size surrounding the outline of the bare cell 110 . For example, the receiving frame 140 includes a pair of first and second sub-frames 141 and 142 facing each other and a pair of third and fourth sub-frames 143 and 144 facing each other substantially forming a rectangular frame shape. The distance H between the first sub-frame 141 and the second sub-frame 142 basically corresponds to the height of the bare cell 110, and the distance W between the third sub-frame 143 and the fourth sub-frame 144 basically corresponds to the width of the bare cell 110. correspond.

The receiving frame 140 may be formed of a material such as polyamide, polyurethane, or plastic. Fiber-reinforced plastic or engineering plastic can be used as the plastic. The receiving frame 140 may be formed by injection molding hot melt resin or its equivalent.

The protection circuit module 150 is disposed outside the receiving frame 140 . The protection circuit module 150 is fixed between the cover 160 and the receiving frame 140 to be electrically connected to the bare cell 110 . The protective circuit module 150 includes: a mounting base 151; at least one electronic component 152 formed on one surface of the mounting base 151; connection members 153 and 154 formed on the same surface as the surface on which the electronic component 152 is formed, and electrically connected to the bare cell 110; the external terminal 155 is formed on the surface opposite to the surface on which the connection members 153 and 154 are formed.

The external terminal 155 is electrically connected to the connection members 153 and 154 through conductive patterns in the mounting base 151 . The external terminal 155 is exposed to the outside through the cover 160 to conduct the current of the bare cell 110 to the outside through the external terminal 155 .

The cover 160 includes a box-shaped body 161 having an inner space and an open surface. The cover 160 is provided with a plurality of external terminal holes 161a. The external terminal hole 161a exposes the external terminal 155 of the protection circuit module 150 to the outside through the external terminal hole 161a. The cover 160 may be formed of a material such as polyamide, polyurethane, or plastic.

The outer tab 170 is formed to surround the first and second surfaces 121 and 122 and the third and fourth sub-frames 143 and 144 of the receiving frame 140 . Adhesive or glue may be disposed on one surface of the outer label 170 that is in contact with the bare cell 110 and the receiving frame 140 . The outer label 170 may be formed of any one of polyethylene terephthalate (PET) and its equivalent.

A method of manufacturing the battery pack 100 according to the present embodiment will be described in more detail. FIG. 13 is a perspective view illustrating a main manufacturing process of the battery pack of FIG. 10 .

First, the bare cell 110 that has been completely manufactured is inspected, and the electrode tabs 134 and 135 extending to the outside of the bare cell 110 are cut to have a predetermined length. Then, the bare cell 110 is inserted into the receiving frame 140 . Subsequently, the electrode tabs 134 and 135 protruding from the bare cell 110 to the outside of the receiving frame 140 are inserted between the first and second layers of the connection members 153 and 154 of the protection circuit module 150 , respectively.

As shown in FIG. 13 , movement of the electrode tabs 134 and 135 inserted between the first and second layers of the connection members 153 and 154 is restricted by spaces formed between the first and second layers, respectively. Accordingly, the electrode tabs 134 and 135 are easily welded to the connection members 153 and 154, respectively. Welding may be performed using a spot welding method. When welding is performed using a spot welding method, weld spots may be formed on an outer surface of each of the connection members 153 and 154 .

Then, the protective circuit module 150 is vertically folded toward the receiving frame 140 . At this time, the electrode tabs 134 and 135 are bent approximately vertically, and the protection circuit module 150 is parallel to the first sub-frame 141 . The fixing protrusion 141 a of the first sub-frame 141 is located corresponding to the cutout portion 151 a, thereby fixing the protection circuit module 151 to the first sub-frame 141 . The mounting base 151 of the protection circuit module 150 is separated from the first sub-frame 141 by a predetermined space by the raised portion 141c. The space formed by the raised portion 141c becomes a housing space for the connection members 153 and 154 and the electronic component 152 .

Then, the cover 160 is coupled to the receiving frame 140 . When the cover 160 is coupled to the receiving frame 140 , the external terminals 155 of the protection circuit module 150 are exposed to the outside through the external terminal holes 161 . The outer label 170 is attached to the outer peripheral surface of the bare cell 110 .

Finally, the water sensitive paper 180 is attached to the cover 160, and a function test of the secondary battery is performed, thereby completing the manufacture of the battery pack 100.

FIG. 14 is an exploded view of a battery pack according to another embodiment of the present invention.

Referring to FIG. 14 , the battery pack 200 according to the present embodiment includes bare cells and a protection circuit module 150 connected to the bare cells.

The bare cell is provided with an electrode assembly 130 and a pouch case 120 for accommodating the electrode assembly 130 therein. The bare cells are independently connected to the positive plate 131 and the negative plate 132 of the electrode assembly 130 . The bare cell is provided with a first electrode tab 134 a and a second electrode tab 135 a, and a part of the first electrode tab 134 a and the second electrode tab 135 a protrude to the outside of the case 120 . The first electrode tab 134 a may be a positive electrode tab connected to the positive electrode plate 131 , and the second electrode tab 135 a may be a negative electrode tab connected to the negative electrode plate 132 . The two electrode tabs 134 a and 135 a are connected to the two connection members 153 and 154 of the protection circuit module 150 .

The housing 120 includes: a first housing 121 having an accommodating portion 127 into which the electrode assembly 130 is inserted; a second housing 122 for covering a top opening of the accommodating portion 127 in the first housing 121 . The receiving portion 127 can be formed using a method such as press working.

The housing 120 is provided with first and second sealing parts 125 respectively located at edges of the first housing 121 and the second housing 122 and combined with each other. The insulating tab tape 136 may be disposed between the first and second sealing parts 125 and the electrode tabs 134 a and 135 a leading from the inside of the case 120 to the outside.

The first case 121 and the second case 122 have a structure in which the first insulating layer 120b and the second insulating layer 120c are stacked such that the metal layer 120a is interposed between the first insulating layer 120b and the second insulating layer 120c. The first insulating layer 120 b is formed on contact surfaces of the first case 121 and the second case 122 . The metal layer 120a may be formed of any one material selected from the group consisting of aluminum, steel, stainless steel, and alloys thereof. The first insulating layer 120b may be formed of any one material selected from the group consisting of cast polypropylene (CPP), polypropylene (PP), and the like. The first insulating layer 120b may be formed of any material having thermal fusion bonding properties that can be used as a sealant. The second insulating layer 120c may be formed of any one material selected from the group consisting of polyethylene terephthalate (PET), nylon, and the like. The second insulating layer 120c of this embodiment is not limited to the above materials.

The protection circuit module 150 is substantially the same as the protection circuit module described with reference to FIG. 8 or FIG. 11 .

When the two electrode tabs 134a and 135a are connected to the connection members 153 and 154 of the protection circuit module 150, the two electrode tabs 134a and 135a are respectively inserted between the two layers of the two connection members 153 and 154, and then passed through The electrode tabs 134 a and 135 a are bonded to the connection members 153 and 154 by a bonding method such as spot welding.

According to this embodiment, the protection circuit module 150 may be located at one side of the bare cell without using a separate frame. Since welding is performed in a state where the electrode tabs 134a and 135a are inserted into the connection members 153 and 154, respectively, a welding process can be performed very easily. Therefore, in a soldering process that requires great care because of the small area, soldering failures can be reduced and the time of the soldering process can be shortened.

According to the above-described embodiments, the electrode tabs of the bare cells are fixedly inserted into the connection member having a non-bending structure, so that movement of the electrode tabs can be restricted during a soldering process, and thus, the bonding process can be easily and stably performed. In addition, the movement of the electrode tabs is restricted, thereby reducing failures in the welding process. That is, the productivity and yield of the battery pack can be improved, and the manufacturing cost can be saved. As described above, although the electrode tab is used as an example here, the connection member may be adapted to receive any tab of the secondary battery.

While the invention has been described in connection with specific exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary, the invention is intended to cover the spirit and scope of the invention included in the claims and their equivalents. Various modifications and equivalent arrangements.

Claims (12)

1. A protection circuit module for a secondary battery, the protection circuit module comprising a substrate and a connection member on the substrate, the connection member comprising: level one; Second floor; a spacer between and separating the first layer from the second layer; the connecting section, which joins the first and second layers together, wherein the connection member is configured as a tab electrically connected to the secondary battery, the tab is inserted into the connection member and welded to the connection member in a state where the tab is inserted into the connection member, wherein the spacer is bonded to at least one of the first layer and the second layer, wherein the spacer is threaded into a groove in the second layer, Wherein, the spacer and the connection part are formed of the same material. 2. The protection circuit module of claim 1, wherein the connection member is bonded to the substrate. 3. The protection circuit module of claim 1, wherein the tab comprises an electrode tab of a secondary battery or a positive temperature coefficient tab electrically connected to an electrode terminal of a battery pack. 4. The protective circuit module of claim 1, further comprising at least one additional spacer between the first layer and the second layer. 5. The protection circuit module of claim 4, wherein the one of the at least one additional spacer and the spacer face each other and are positioned to contact each other. 6. The protection circuit module of claim 1, wherein the connection part is integral with the first layer and the second layer. 7. A battery pack, the battery pack comprising: Bare cells, including electrode assemblies; Lugs, electrically connected to bare cells; A protection circuit module, electrically coupled to a bare cell, the protection circuit module comprising a base and a connection member electrically coupled to a lug on the base, Wherein, the connection member includes a first layer, a second layer, a spacer and a connection part, the spacer is between the first layer and the second layer and separates the first layer from the second layer, wherein the wiring piece is in the first Between the first layer and the second layer, the connecting part combines the first layer and the second layer together, the lug is inserted into the connection member and welded to the connection member in a state where the lug is inserted into the connection member, wherein the spacer is bonded to at least one of the first layer and the second layer, wherein the spacer is threaded into a groove in the second layer, Wherein, the spacer and the connection part are formed of the same material. 8. The battery pack of claim 7, wherein the connection member is coupled to the base. 9. The battery pack of claim 7, further comprising at least one additional spacer between the first layer and the second layer. 10. The battery pack according to claim 7, further comprising a housing frame for housing bare cells. 11. The battery pack of claim 7, wherein the tab comprises an electrode tab of a bare cell or a positive temperature coefficient tab electrically connected to an electrode terminal of the battery pack. 12. The battery pack of claim 7, wherein the tab is welded to any one of the first layer and the second layer.