WO2019088418A1

WO2019088418A1 - Battery pack

Info

Publication number: WO2019088418A1
Application number: PCT/KR2018/009409
Authority: WO
Inventors: 허상도
Original assignee: 삼성에스디아이 주식회사
Priority date: 2017-10-30
Filing date: 2018-08-16
Publication date: 2019-05-09
Also published as: KR20190048067A; KR102426252B1

Abstract

A battery pack is disclosed in the present invention. The battery pack comprises a battery cell which includes an electrode tab, a protection circuit module which is electrically connected to the electrode tab and includes a first and a second surfaces which are opposed to each other; a tab accommodating portion which mediates an electrical connection between the electrode tab and the protection circuit module and accommodates the electrode tab, and a connection tab which includes a coupling portion forming a coupling with the protection circuit module, wherein the coupling portion comprises a thermal junction portion which is joined to a first surface of the protective circuit module and a fastening portion which is physically fastened to a second surface of the protective circuit module. According to the present invention, a battery pack with improved structure such that the connection tabs can be easily coupled while the position fixing of the connection tabs mediating the electrical connection between the battery cell and the protection circuit module can be firmly performed is provided.

Description

Battery pack

The present invention relates to a battery pack.

Generally, a secondary battery is a battery capable of charging and discharging, unlike a primary battery which can not be charged. The secondary battery is used as an energy source for a mobile device, an electric vehicle, a hybrid vehicle, an electric bicycle, an uninterruptible power supply, etc., and may be used in the form of a single battery, Are connected to each other to form a unit.

A small mobile device such as a mobile phone can operate for a predetermined time with the output and capacity of a single battery. However, in the case of driving for a long time such as an electric vehicle or a hybrid vehicle with high power consumption and high power driving, A module type including a battery is preferred, and the output voltage and the output current can be increased according to the number of the built-in batteries.

An embodiment of the present invention provides a battery pack having an improved structure so that connection tabs can be easily assembled while firmly fixing the position of the connection tabs that mediate electrical connection between the battery cell and the protection circuit module, .

In the battery pack of the present invention,

A battery cell including an electrode tab;

A protection circuit module electrically connected to the electrode tab, the protection circuit module including first and second surfaces opposed to each other; And

And a connection tab which mediates an electrical connection between the electrode tab and the protection circuit module and includes a tab accommodating part for accommodating the electrode tab and an engaging part for engaging the protection circuit module,

The coupling portion

A thermally bonded portion bonded on a first side of the protective circuit module; and a fastening portion physically fastened on the second side of the protective circuit module.

According to the present invention, in a connection tab for mediating an electrical connection between a battery cell and a protection circuit module, the connection tab forms different dissimilar bonds with respect to the first and second opposite surfaces of the protection circuit module, The positions of the tabs can be firmly fixed, and the connection tabs can be easily joined through the joining of the connection tabs.

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

FIG. 2 is a perspective view showing the battery cell shown in FIG.

Fig. 3 is a perspective view showing the protection circuit module shown in Fig.

Figs. 4 and 5 show different perspective views for explaining the connection tab shown in Fig.

6 is a cross-sectional view taken along the line VI-VI of FIG.

In the battery pack of the present invention,

A battery cell including an electrode tab;

The coupling portion

For example, the tab accommodating portion and the thermal connecting portion are disposed on the first surface side of the protection circuit module,

The fastening portion may extend from the first surface side to the second surface side of the protection circuit module and be fastened on the second surface.

For example, the tab receiving portion and the thermal bonding portion may be connected to each other to form the same plane.

For example, the connection tab may include: a first plate including the tab receiving portion and the engaging portion; And

And a second plate that is folded toward the first plate so as to sandwich the electrode tab between the first plate and the second plate to cover the electrode tab.

For example, the engaging portion may be formed on both sides of the tab accommodating portion.

For example, the protection circuit module is drawn inward from the edge of the protection circuit module facing the battery cell to form an opening,

The coupling tab is coupled to both sides of the opening while the connection tab extends across the opening,

The tab accommodating portion is supported in a suspended state on the first surface side of the protection circuit module and can be exposed to the second surface side through the opening.

For example, the engaging portion may be formed in a symmetrical shape along the drawing direction of the opening portion.

For example, the engaging portion may extend along the drawing direction of the opening,

The thermal joint may be formed at the front end and the rear end of the coupling part along the drawing direction of the opening, and the coupling part may be formed at a position between the front and rear thermal joints.

For example,

And is not formed at the innermost portion of the electrode tab along the drawing direction of the opening,

And may be formed on both sides of the electrode tab along a width direction perpendicular to the drawing direction of the opening.

For example, the engaging portion may be formed in a symmetrical shape along a width direction perpendicular to the drawing direction of the opening.

For example, the engaging portion at the left end of the connection tab and the engaging portion at the right end along the width direction of the opening may have a symmetrical shape.

For example, the thermal junction may be soldered to both sides of the opening,

The tab receiving portion may be welded to the electrode tab through the opening.

For example, the thermal bonding portion and the coupling portion form dissimilar dissimilar bonds with the first and second surfaces of the protection circuit module, respectively,

The thermal joint includes a solidified structure after being melted or semi-melted at a high temperature,

The fastening portion extends from the first surface to the second surface through the opening and can be brought into pressure contact with the second surface.

For example,

A first extending portion bent from the tab receiving portion and extending to a depth out of the second surface;

A second extending portion bent from the first extending portion and extending in a direction toward the second surface; And

And a contact portion which is in pressure contact with the second surface at the end of the second extension portion.

For example, the coupling portion may further include first and second bending portions bent in opposite directions along the thickness direction of the protection circuit module between the first and second surfaces.

For example, the first and second bent portions may be formed in a direction facing each other along the thickness direction between the first and second surfaces between the tab receiving portion on the first surface side and the contact portion on the second surface side It is possible to provide an elastic force.

For example, a plurality of electrical components may be mounted on the second side of the protection circuit module.

For example, in the battery pack,

A cell seating portion for receiving the battery cell, and a circuit seating portion for receiving the protection circuit module.

For example, the cell seating portion may be formed on both sides of the circuit seating portion.

Hereinafter, a battery pack according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is a perspective view showing the battery cell shown in FIG. Fig. 3 is a perspective view showing the protection circuit module shown in Fig. Figs. 4 and 5 show different perspective views for explaining the connection tab shown in Fig. 6 is a cross-sectional view taken along the line VI-VI of FIG.

Referring to FIG. 1, the battery pack of the present invention includes a battery cell 200 including an electrode tab 215, and first and second opposite surfaces electrically connected to the electrode tab 215, And a connection tab 400 coupled to the first surface S1 of the protection circuit module 300. The protection circuit module 300 includes a plurality of connection terminals S1 and S2.

Referring to FIG. 2, the battery cell 200 may include an electrode assembly (not shown) and a pouch 205 for sealing the electrode assembly (not shown).

The electrode assembly (not shown) includes, for example, a positive electrode plate (not shown) coated with a positive electrode active material, a negative electrode plate (not shown) coated with a negative electrode active material, and a separator (not shown) interposed between the positive electrode plate and the negative electrode plate And then laminating these laminated bodies in the form of a jelly roll. Alternatively, the electrode assembly (not shown) may be fabricated by sequentially laminating a positive electrode plate (not shown), a separator (not shown), and a negative electrode plate (not shown) a plurality of times.

The battery cell 200 may include first and

second electrode tabs

210 and 220 having different polarities and electrically connected to the electrode assembly (not shown). The first and

second electrode tabs

210 and 220 are drawn out to the outside through the first side 201 of the battery cell 200 and may be electrically connected to the protection circuit module 300 as described later.

In this specification, the first and

second electrode tabs

210 and 220 may collectively be referred to as electrode tabs 215. For example, the electrode tab 215 may be used to include any one of the first and

second electrode tabs

210 and 220, or both the first and

second electrode tabs

210 and 220.

The battery cell 200 may be formed in a substantially hexahedral shape including two main surfaces including one surface and the other surface opposite to each other, and

side portions

201, 202, 203, and 204 between the main surfaces.

More specifically, the

side portions

201, 202, 203, and 204 of the battery cell 200 include a first side portion 201 through which the

electrode tabs

210 and 220 are drawn, a second side portion 202 formed on the opposite side of the first side portion 201, And third and

fourth sides

203 and 204 extending in parallel between the first and

second sides

201 and 202. For example, the first side portion 201 of the battery cell 200 may have a terrace through which the electrode tab 215 is drawn.

In the embodiment illustrated in FIG. 1, the battery cells 200 are formed of two pairs of two battery cells 200, and the battery cells 200 are connected to the battery cells 200 so that the electrode tabs 215 are drawn out from the two battery cells 200 in pairs, 200 may face each other. In this embodiment, the electrode tabs 215 drawn out from each battery cell 200 may extend in opposite directions and be collected on both sides of the protection circuit module 300.

In another embodiment of the present invention, the battery cells 200 may be arranged in parallel with each other, and the electrode tabs 215 drawn out from the respective battery cells 200 may extend in a side- It may be collected at one side.

The protection circuit module 300 monitors the operation of the battery cell 200 by measuring the state variables of the battery cell 200 such as temperature, voltage and current and monitors the operation of the battery cell 200 according to the monitored result. , And a control unit for controlling the discharge operation.

For example, the discharge current collected from each battery cell 200 may be input to the protection circuit module 300 and may be connected to the set device (not shown) through the protection circuit module 300. To this end, the protection circuit module 300 may be connected to a connection member 350 for electrical connection with a set device (not shown). For example, the connecting member 350 may include a plurality of wires.

For example, the battery pack may be built in a set device (not shown) to form a power supply device, and may be connected to a set device (not shown) through a connection member 350 including a plurality of wires for signal transmission and power supply. And the like. Meanwhile, at one end of the connection member 350, a connector 360 for electrical connection with a set device (not shown) may be provided.

Referring to FIG. 1, the battery pack may further include a frame 100 for supporting the battery cell 200 and the protection circuit module 300 together. The frame 100 forms a skeleton of the entire battery pack and supports the battery cell 200 and the protection circuit module 300 together and protects the entire battery cell 200 and the protection circuit module 300 .

The frame 100 may be provided with a cell seating part G for receiving the battery cell 200. The cell seating part G may be formed in a recessed concave shape to define a position where the battery cell 200 is mounted. For example, the cell seating part G may define a position where the battery cell 300 is mounted by the partition wall 100a formed along the frame rim. The cell seating part G may have a groove shape corresponding to the battery cell 200. The frame 100 can support at least two or more battery cells 200 and provide each cell seating G surrounded by the partition 100a for each battery cell 200. [ have.

A circuit seat P for receiving the protection circuit module 300 may be formed on the frame 100. The circuit receiving portion P may be formed as a groove having a shape corresponding to the protective circuit module 300.

For example, the circuit seating part P may be formed at a substantially central position of the frame 100, and the cell seating part G may be formed on both sides of the circuit seating part P. Since the protection circuit module 300 is electrically connected to the plurality of battery cells 200, the protection circuit module 300 can be disposed in the middle position to shorten the electrical connection path.

The cell seating portion G and the circuit seating portion P may be separately formed by barrier ribs 100a extending across the frame 100. Each cell seating portion G And the battery cell 200 and the protection circuit module 300 housed in the circuit seating portion P can avoid mechanical interference with neighboring structures and can be electrically insulated.

Although not shown in the drawings, the frame 100 may be provided with a strength reinforcing portion. The strength reinforcement (not shown) may include a plurality of ribs (not shown), for example, a plurality of ribs (not shown) extending in parallel along one direction on a plane of the frame 100 . Such a strength reinforcing portion (not shown) can provide sufficient mechanical rigidity to reduce the weight of the entire frame and to resist bending and bending deformation.

For example, the partition 100a defining the cell seating portion G and the circuit seating portion P may be formed along the rim of the frame 100 or extend in a direction transverse to the frame 100 And can serve as a strength reinforcement for reinforcing the mechanical strength of the entire frame 100. Meanwhile, the frame 100 may be formed by injection molding using an insulating resin.

The frame 100 may include a first side 101 and a second side 102. For example, the battery cell 200 and the protection circuit module 300 may also include a first side 101 and a second side 102, (Not shown). For example, the first and

second surfaces

101 and 102 of the frame 100 refer to the main surface of the frame 100 and may occupy the largest area of the substantially rectangular parallelepiped frame 100.

The battery pack illustrated in FIG. 1 may include an insulating plate 500 disposed to cover the first surface 101 of the frame 100. The insulating plate 500 may be disposed to cover the first surface 101 of the frame 100 so that the battery cell 200 is not separated from the frame 100. For example, the battery cell 200 is mounted on the frame 100, and the insulating plate 500 is disposed to cover the battery cell 200, so that the battery cell 200 is separated from the frame 100 Can be prevented. The battery cell 200 may be firmly fixed on the frame 100 through an insulating plate 500 disposed on the first side 101 of the frame 100. [

The insulating plate 500 may be assembled on the frame 100 or may be adhesively fixed on the frame 100. The insulating plate 500 may be formed of an insulating material such as PET (polyethylene terephthalate), and may be formed in a plate-like shape as a whole.

The battery cell 200 is electrically connected to the protection circuit module 300. More specifically, the electrode tab 215 drawn out from the battery cell 200 is electrically connected to the connection tab 400 on the protection circuit module 300. For example, the electrode tab 215 of the battery cell 200 and the connection tab 400 on the protection circuit module 300 can be welded to each other.

4 to 6, the electrode tab 215 of the battery cell 200 is electrically connected to the connection tab 400 on the protection circuit module 300.

For example, the electrode tab 215 of the battery cell 200 may be welded to the connection tab 400 after being mounted on the connection tab 400 on the protection circuit module 300. At this time, the electrode tab 215 of the battery cell 200 and the connection tab 400 on the protection circuit module 300 can be welded together through the welding electrode (not shown) while being overlapped with each other. For example, a welding electrode (not shown) may have an electrode tab 215 overlapped with each other and an upper electrode tab 215 and a lower electrode tab 400, More specifically, a welding current can be applied through the top surface of the connection tab 215 and the bottom surface of the connection tab 400 exposed downward through the opening OP.

The protection circuit module 300 includes a circuit board 301 and a plurality of electric elements 300E mounted on the circuit board 301 for controlling charging and discharging operations of the battery cell 200 can do. A connection tab 400 connected to the electrode tab 215 of the battery cell 200 may be mounted on the circuit board 301. The first surface S1 and the second surface S2 of the protection circuit module 300 are connected to the circuit board 301 and the second surface S2 of the protection circuit module 300, On the first and second surfaces S1 and S2 of the circuit board 301 are a plurality of parts, that is, connection tabs 400 and electric elements 300E may be mounted.

The connection tab 400 may be coupled to the first surface S1 of the protection circuit module 300 and the battery cell 200 may be coupled to the second surface S2 of the protection circuit module 300. [ A plurality of electric elements 300E for controlling charging and discharging operations of the battery pack 300 may be mounted. The connection tab 400 and the plurality of electric elements 300E are mounted on the first surface S1 and the second surface S2 of the protection circuit module 300, A structure advantageous for downsizing and thinning of the protective circuit module 300 to be mounted can be provided. That is, by utilizing the first and second surfaces S1 and S2 which are opposed to each other on one side of the protection circuit module 300, a plurality of parts are efficiently arranged in the region of the limited protection circuit module 300 And the connection tab 400 is coupled onto the first surface S1 opposite to the second surface S2 on which the plurality of electric elements 300E are mounted so that the mounting space of the electric elements 300E is sufficient Can be secured.

In an embodiment of the present invention, the connection tab 400 is coupled to the first surface S1 opposite to the second surface S2 on which the plurality of electric elements 300E are mounted, The thickness of the protection circuit module 300 on the second surface S2 on which the plurality of electric elements 300E are mounted can be prevented from being increased. For example, the connection tab 400 may include a first plate 410 coupled to the protection circuit module 300, and an electrode tab 215 bent in a direction opposite to the first plate 410, The height or thickness of the second plate 420 that is bent and extended from the first plate 410 is greater than the height or thickness of the second plate 420 on which the plurality of electric elements 300E are mounted The total thickness of the protection circuit module 300 can be increased. The connection tab 400 may be formed on the first surface S1 of the protection circuit module 300 instead of the second surface S2 of the protection circuit module 300 on which the plurality of electric elements 300E are disposed. It is possible to prevent the entire thickness of the protection circuit module 300 from being increased on the second surface S2 and to provide a structure advantageous for reducing the thickness of the protection circuit module 300. [

The connection tab 400 may extend across the opening OP of the protection circuit module 300 and may be coupled to both sides of the opening OP. The opening OP exposes the tab receiving portion R which is a part of the connection tab 400 so that the welding electrode (not shown) contacts the connection tab 400, more specifically, Accessible. The opening OP may be formed to extend inward from the edge of the protection circuit module 300 facing the battery cell 200 such that the opening OP sufficiently exposes the tap accommodating portion R. [ May be formed at a predetermined depth along the lead-in direction Z1 and may have a predetermined width along the widthwise direction Z2 perpendicular to the lead-in direction Z1. The tap receiving portion R exposed through the opening OP is allowed to approach or laser irradiate a welding electrode (not shown) and thus welded to the electrode tab 215. The protection circuit module 300 and the connection tab 400 may be formed on both sides of the opening OP through the bonding pads 300C formed on both sides of the opening OP, Can be combined with each other. The opening OP may enable the connection tab 400 to form a coupling with respect to the first side S1 and the second side S2 of the protection circuit module 300 which are opposite to each other. This will be described later in more detail.

The connection tab 400 includes a first plate 410 coupled to the protection circuit module 300 and a second plate 410 bent between the first plate 410 and the electrode tab 215 And a second plate 420 covering the electrode tab 215 so that the electrode tab 215 is inserted. The first plate 410 and the second plate 420 may be connected to each other by the bending portion 430 and the first and

second plates

410 and 420 may be connected to each other through the electrode tab 215, The first and

second plates

410 and 420 and the electrode tabs 215 between the first and

second plates

410 and 420 are overlapped and welded in a superimposed manner so that the first and

second plates

410 and 420 and the electrode tabs 215 Can be firmly coupled. The bending part 430 may have a cutout 430 'so that the first and

second plates

410 and 420 can be easily folded to bend the first and

second plates

410 and 420 in opposite directions.

The first plate 410 may include a tab receiving portion R for receiving the electrode tab 215 and a coupling portion C formed on both sides of the tab receiving portion R. [ The tab receiving portion R may be formed in the center region of the first plate 410 along the width direction Z2 of the opening OP and may include an electrode tab 215 extending from the battery cell 200 And the electrode tab 215 can be interposed between the second plates 420 that are folded to face the first plate 410. [ The electrode tab 215 and the second plate 420 are joined to each other through a welding connection and the tab receiving portion R is connected to the electrode tab 215, And may form a welded connection with the electrode tab 215. The tap accommodating portion R may be exposed through the opening OP of the protection circuit module 300 and may be exposed to the tap accommodating portion R exposed through the opening OP of the protection circuit module 300. [ (Not shown) is allowed to be allowed to be irradiated with laser, and laser irradiation can be allowed in non-contact welding such as laser welding. The tab receiving portion R may include a recess W for aligning the welding electrode (not shown) and fixing the position of the welding electrode (not shown). The recesses W may be formed in pairs corresponding to welding electrodes (not shown) having different polarities.

The connection tab 400 may extend across the opening OP of the protection circuit module 300. At this time, as the connection tab 400 extends across the opening OP, the coupling portion C of the connection tab 400 can be coupled to both sides of the opening OP, The tab receiving portion R may be exposed through the opening OP. The tap accommodating portion R is suspended from the first surface S1 side of the protection circuit module 300 so that the tab accommodating portion R is engaged with the coupling portion C of the protection circuit module 300 and exposed to the second surface S2 side of the protection circuit module 300 to form a welded connection with the electrode tab 215 .

The coupling portion C may be formed on both sides of the connection tab 400 and may be formed on both sides of the connection tab 400 spanning the opening OP of the protection circuit module 300, (More specifically, the bonding pad 300C). The coupling portion C is formed at the edge of the connection tab 400 and can be supported on both sides of the opening OP to support the connection tab 400. [

The coupling portion C includes a thermal connection portion CT and a coupling portion CP that form dissimilar dissimilarities with the first and second surfaces S1 and S2 of the protection circuit module 300, can do. For example, the thermal joint CT of the joint portion C may include a base material or a filler material which is melted or semi-melted at a high temperature by applying predetermined heat and pressure. That is, the thermal interface CT may be thermally bonded to the first surface S1 of the protection circuit module 300 and may include a solidified structure after being melted or semi-melted, for example, by a thermal process. More specifically, the thermal interface CT may be soldered to the bonding pad 300C formed on the first surface S1 of the protection circuit module 300. [ The bonding pad 300C may be formed on both sides in the width direction Z2 of the opening OP. The thermal bonding portion CT may be placed on the bonding pad 300C to be overlapped with the bonding pad 300C and the thermal bonding portion CT and the bonding pad 300C may be disposed on the bonding pad 300C through a thermal process such as soldering. Can be combined.

The thermally joined portion CT may be disposed on the same plane as the tab receiving portion R and may extend from the tab receiving portion R so that the tab And may be disposed on the first surface S1 side.

Unlike the thermal junction CT, the coupling CP may be physically or mechanically coupled to the protection circuit module 300. Here, being physically or mechanically coupled means that it forms a coupling with the protection circuit module 300 through the shape of the coupling part CP. More specifically, the fastening portion CP may be physically or mechanically fastened to the second surface S2 of the protection circuit module 300. As shown in FIG. For example, the connection tab 400 may be coupled from the first surface S1 side of the protection circuit module 300, and the connection portion CP of the connection tab 400 may include an opening OP From the first surface S1 side of the protection circuit module 300 to the second surface S2 side and can be bonded to both sides of the opening OP of the second surface S2. For example, the coupling portion CP may be bent from the tap accommodating portion R and extend toward the second surface S2 side of the protection circuit module 300, S2 at a predetermined pressure.

6, the coupling part CP is bent from the tap accommodating part R and extends through the opening OP to a depth outside the second surface S2 of the protection circuit module 300 A second extending portion CP2 bent from the first extending portion CP1 and extending in a direction toward the second surface S2 and a second extending portion CP2 extending from the second extending portion CP2, And a contact portion CP3 which is in pressure contact with the second surface S2 at a predetermined pressure at an end thereof.

That is, the coupling portion CP may be formed in a shape that is bent twice in a direction opposite to each other along the thickness direction Z3 of the protection circuit module 300 between the first and second surfaces S1 and S2 And may include first and second bent portions b1 and b2 bent in directions opposite to each other. The first bent portion b1 may form a downward bend between the tap accommodating portion R and the first extending portion CP1 and the second bent portion b2 may be formed to extend from the first extending portion CP1 and the second extended portion CP2. Here, the thickness direction Z3 of the protection circuit module 300 may mean a vertical direction and may mean a direction in which the connection tab 400 is assembled with respect to the protection circuit module 300. [

The coupling portion CP is bent from the tab receiving portion R on the first surface S1 side of the protection circuit module 300 and is engaged with the second surface S2. It is possible to provide an effective resistance to an external force to separate the connection tab 400 from the first surface S1 to be coupled. For example, the thermal interface CT may be thermally bonded to the first surface S1 of the protection circuit module 300 so that the connection tab 400 may be removed from the first surface S1, It is possible to provide a certain degree of resistance to the external force to be separated, but it may be difficult to effectively resist the external force depending on the coupling strength with the first surface S1. Since the fastening portion CP is supported and fixed to the second surface S2 of the protection circuit module 300, the fastening portion CP can effectively cope with an external force for separating the connection tab 400 from the first surface S1 .

The fastening portions CP are bent twice in the directions opposite to each other along the up and down direction Z3 from the tab accommodating portion R, And the contact portion CP3 on the second surface S2 side can be resiliently connected. The reason that the tab receiving portion R on the first surface S1 side and the contact portion CP3 on the second surface S2 side are elastically connected is that the tab receiving portion R on the first surface S1 side, (R) and the contact portion (CP3) on the side of the second surface (S2) are opposed to each other. By the elastic action of the fastening portion (CP) The thermal joint CT connected to the first surface S2 of the protection circuit module 300 is in pressure contact with the first surface S1 of the protection circuit module 300 and the contact CP3 can be brought into pressure contact with the second surface S2. The thermal contact portion CT is pressed against the first surface S1 side of the protection circuit module 300 and the contact portion CP3 contacts the first surface S1 of the protection circuit module 300 via the coupling portion CP, The entire connection tab 400 can be brought into tight contact with the protection circuit module 300 by being brought into pressure contact with the second surface S2 side.

Referring to FIG. 6, the fastening portions CP may have a structure in which the fastening portions CP are bent twice in the directions opposite to each other along the up-and-down direction Z3 from the tap accommodating portion R and are bent toward opposite directions And may include first and second bent portions b1 and b2. For example, one end of the first extended portion CP1 of the fastening portion CP is bent downward from the tab receiving portion R on the first surface S1 side, and the first extended portion CP1, The second extended portion CP2 connected to the other end of the contact portion CP2 may be bent upward and connected to the contact portion CP3. The folded structure of the coupling part CP can induce elastic deformation that can be stretched and compressed along the vertical direction Z3. For example, when the connection tab 400 is connected to the protection circuit module 300 In a process of assembling the connection tab 400 which seats on the first surface S1 and simultaneously fixes the connection portion CP of the connection tab 400 on the second surface S2, The tabs 400 can be easily assembled and the assembled connection tabs 400 can be tightly adhered to the protection circuit module 300 by elastic restoring force.

4 and 5, the engaging portion C may be formed symmetrically along the pulling-in direction Z1 and the widthwise direction Z2 of the opening OP, ) And the protection circuit module 300. [0053]

More specifically, engagement portions C are formed at both ends of the connection tab 400 along the width direction Z2 of the opening portion OP, and engagement portions C formed at both ends of the connection tab 400 May have a symmetrical shape with respect to each other. The engaging portion C formed at the left end of the connection tab 400 and the engaging portion C formed at the right end of the connection tab 400 are symmetrical to each other along the width direction Z2 of the opening OP, As shown in FIG. Since the engaging portion C formed at the left end portion of the connection tab 400 and the engaging portion C formed at the right end portion are formed symmetrically with each other along the width direction Z2 of the opening portion OP as described above, OP can be provided with a balanced coupling force between the connection tab 400 and the protection circuit module 300 along the width direction Z2.

In addition, along the infeed direction Z1 of the opening OP, both ends of the connection tab 400, that is, the front end of the joint C and the rear end of the joint C, And a fastening part CP may be formed at the center between the thermal joints CT. Since the thermal bonding portion CT and the fastening portion CP forming the dissimilar coupling of the engaging portion C are formed symmetrically along the pulling-in direction Z1 of the opening OP as described above, A balanced coupling force between the connection tab 400 and the protection circuit module 300 along the direction Z1 can be provided.

The fastening part CP may form a state of assembling between the thermal joint CT and the protection circuit module 300 before the thermal bonding of the thermal bonding part CT. The connection tab 400 may be seated on the opening OP of the protection circuit module 300 so that the tabs 400 of the connection tabs 400 The connection part 400 is connected to the protection circuit module 300 so that the coupling part C on both sides of the tap accommodating part R extends over both sides of the opening part OP On the first surface S1 of the first and second plates. The engaging portion C on both sides of the tab receiving portion R is seated on the first surface S1 of the protective circuit module 300 while the connection tab 400 is seated on the first surface S1 of the protective circuit module 300 S1) and the second surface (S2). More specifically, the thermal joint CT of the coupling portion C is seated on the first surface S1 of the protection circuit module 300, and the coupling portion CP of the coupling portion C is engaged with the opening (OP) to be stuck on the second surface (S2).

The fastening portion CP resiliently connects the tab receiving portion R on the first surface S1 side with the contact portion CP3 on the second surface S2 side, The abutting portion CT can be brought into pressure contact with the first surface S1 and the abutting portion CP3 can be brought into pressure contact with the second surface S2. Accordingly, the connection tab 400 can form a state of being assembled on the protection circuit module 300, and can provide stable support for thermal bonding of the following thermal junction CT. The thermal connection portion CT on both sides of the tap accommodating portion R and the first surface S1 of the protection circuit module 300 are connected to each other in the state where the connection tab 400 and the protection circuit module 300 are assembled, The connection tab 400 can be firmly fixed on the protection circuit module 300 by performing a thermal process such as soldering on the pad 300C.

A thermal bonding portion CT is formed at a front end portion and a rear end portion of the engaging portion C along the pulling-in direction Z1 of the opening portion OP, and at the center between the thermal bonding portions CT, Is formed. Accordingly, the fastening portion CP can stably support the thermal joint CT at a position adjacent to the thermal joint CT, and can prevent the thermal joint CT from being damaged even before thermal bonding of the thermal joint CT. The thermal connection between the thermal junctions CT and the protection circuit module 300 can be facilitated.

The engaging portion C of the connection tab 400 is positioned between the thermal bonding portion CT at the front end portion and the rear end portion along the pulling-in direction Z1 of the opening portion OP and between the front and rear thermal bonding portions CT As shown in FIG. In this regard, the engaging portion C of the connection tab 400 may be symmetrically formed along the pulling-in direction Z1 of the opening OP. In the present invention, when the engaging portion C of the connection tab 400 is symmetrically formed along the pulling-in direction of the opening portion OP, It is not necessary to be limited to the configuration in which the thermal joint CT of the rear end and the thermal joint CT of the rear end have the same length. For example, in one embodiment of the present invention, the forward end, that is, the inner thermal interface CT is located at the rear end, i.e., the outer thermal interface CT, along the entry direction Z1 of the opening OP It may have a relatively long length.

The connection tab 400 includes a tab receiving portion R exposed from the opening OP and an engaging portion C that covers both sides of the opening OP and is coupled to both sides of the opening OP. The engaging portion C is formed at both ends of the connection tab 400 along the width direction Z2 of the opening OP and is formed along the insertion direction Z1 of the opening 400. It is not formed inside.

That is, the connection between the connection tab 400 and the protection circuit module 300 is formed on both sides of the opening OP along the width direction Z2 of the opening OP, The coupling tabs 400 are not coupled at the innermost side of the opening OP farthest from the edge of the protection circuit module 300 facing the innermost side of the battery cell 200. That is,

The opening OP may be formed in such a manner that one side of the opening OP is drawn inward from the edge of the protection circuit module 300 facing the battery cell 200. For example, The connection tab 400 is coupled to both sides of the opening OP but the connection tab 400 is not coupled to the innermost side of the opening OP.

6, the coupling portion CP is bent from the tap accommodating portion R on the first surface S1 side, passes through the opening portion OP, and extends toward the second surface S2 side, (S2) of the base plate (300). At this time, the second surface S2 of the protection circuit module 300 to which the coupling portion CP is coupled may correspond to a device room where a plurality of electric devices 300E are mounted. In the connection tab 400, on the first surface S1 side of the protection circuit module 300, the tab joint R and the thermal joint CT of the joint C on both sides of the tab accommodating portion R, The second plate 420 is disposed. A coupling portion CP of the coupling portion C may be disposed on the second surface S2 side of the protection circuit module 300 among the connection tabs 400. [

Since a plurality of electric elements 300E for controlling charging and discharging operations of the battery cell 200 are disposed on the second surface S2 of the protection circuit module 300, It is more effective to use the mounting space of the protection circuit module 300 efficiently by arranging the fastening portions CP occupying a smaller area on the side of the surface S2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand the point.

INDUSTRIAL APPLICABILITY The present invention can be applied to various devices using a battery pack as an energy source capable of charging and discharging and a battery pack as a driving power source.

Claims

A battery cell including an electrode tab;

A protection circuit module electrically connected to the electrode tab, the protection circuit module including first and second surfaces opposed to each other; And

And a connection tab which mediates an electrical connection between the electrode tab and the protection circuit module and includes a tab accommodating part for accommodating the electrode tab and an engaging part for engaging the protection circuit module,

The coupling portion

A thermal bonding portion bonded on a first side of the protection circuit module; and a fastening portion physically fastened on a second side of the protection circuit module.
The method according to claim 1,

Wherein the tab accommodating portion and the thermal bonding portion are disposed on a first surface side of the protection circuit module,

Wherein the fastening portion extends from the first surface side to the second surface side of the protection circuit module and is fastened on the second surface.
The method according to claim 1,

Wherein the tab accommodating portion and the thermal joint portion are connected to each other to form the same plane.
The method according to claim 1,

The connection tab includes a first plate including the tab accommodating portion and the engaging portion; And

And a second plate folded toward the first plate so as to sandwich the electrode tab between the first plate and the second plate to cover the electrode tab.
The method according to claim 1,

And the engaging portion is formed on both sides of the tab accommodating portion.
The method according to claim 1,

Wherein the protection circuit module is drawn inward from the edge of the protection circuit module facing the battery cell to form an opening,

The coupling tab is coupled to both sides of the opening while the connection tab extends across the opening,

Wherein the tab accommodating portion is supported in a suspended state on the first surface side of the protection circuit module and exposed to the second surface side through the opening portion.
The method according to claim 6,

Wherein the engaging portion is formed in a symmetrical shape along the drawing direction of the opening portion.
The method according to claim 6,

Wherein the engaging portion extends along the drawing direction of the opening,

Wherein the thermal joint is formed at a front end portion and a rear end portion of the engaging portion along the pulling-in direction of the opening portion, and the fastening portion is formed at a position between the front and rear thermal joining portions.
The method according to claim 6,

The coupling portion

And is not formed at the innermost portion of the electrode tab along the drawing direction of the opening,

Wherein the electrode tab is formed on both sides of the electrode tab along a width direction perpendicular to the drawing direction of the opening.
The method according to claim 6,

Wherein the engaging portion is formed in a symmetrical shape along a width direction perpendicular to a drawing direction of the opening portion.
11. The method of claim 10,

And the engaging portion at the left end of the connection tab and the engaging portion at the right end of the connection tab have a symmetrical shape along the width direction of the opening.
The method according to claim 6,

Wherein the thermal junction is soldered to both sides of the opening,

Wherein the tab receiving portion is welded to the electrode tab through the opening.
The method according to claim 6,

Wherein the thermal bonding portion and the coupling portion form dissimilar heterogeneous bonds with the first and second surfaces of the protection circuit module respectively,

The thermal joint includes a solidified structure after being melted or semi-melted at a high temperature,

Wherein the fastening portion extends from the first surface to the second surface through the opening and is brought into pressure contact with the second surface.
14. The method of claim 13,

The fastening portion

A first extending portion bent from the tab receiving portion and extending to a depth out of the second surface;

A second extending portion bent from the first extending portion and extending in a direction toward the second surface; And

And a contact portion that is in pressure contact with the second surface at an end of the second extending portion.
15. The method of claim 14,

Wherein the coupling portion further includes first and second bending portions bent in directions opposite to each other along the thickness direction of the protection circuit module between the first and second surfaces.
16. The method of claim 15,

Wherein the first and second bent portions provide an elastic force in a direction facing each other along the thickness direction between the first and second surfaces between the tab receiving portion on the first surface side and the contact portion on the second surface side And a battery pack.
The method according to claim 1,

And a plurality of electric elements are mounted on the second surface of the protection circuit module.
The method according to claim 1,

Further comprising a frame including a cell seating portion for receiving the battery cell and a circuit seating portion for receiving the protection circuit module.
19. The method of claim 18,

Wherein the cell seating portion is formed on both sides of the circuit seating portion.