KR102426252B1 - Battery pack - Google Patents

Abstract

The present invention discloses a battery pack. The battery pack includes a battery cell including an electrode tab, electrically connected to the electrode tab, a protection circuit module including first and second surfaces opposite to each other, and an electrical connection between the electrode tab and the protection circuit module and a connection tab including a tab receiving portion for accommodating the electrode tab and a coupling portion for forming a coupling with the protection circuit module, wherein the coupling portion is a thermal bonding portion bonded on the first surface of the protection circuit module and a fastening part physically fastened on the second surface of the protection circuit module.
According to the present invention, there is provided a battery pack with an improved structure so that the connection tabs that mediate the electrical connection between the battery cells and the protection circuit module are securely fixed and the connection tabs can be easily coupled.

Description

battery pack {Battery pack}

The present invention relates to a battery pack.

In general, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supply, etc. It is also used in the form of a module bundled as a unit by connecting the batteries of

Small mobile devices such as cell phones can be operated for a certain period of time with the output and capacity of a single battery. A module type including a battery is preferred, and the output voltage or output current can be increased according to the number of built-in batteries.

An embodiment of the present invention provides a battery pack with an improved structure so that the connection tab can be easily coupled while the position of the connection tab that mediates the electrical connection between the battery cell and the protection circuit module is firmly fixed. include

The battery pack of the present invention,

a battery cell comprising electrode tabs;

a protection circuit module electrically connected to the electrode tab and including first and second surfaces opposite to each other; and

A connection tab that mediates the electrical connection between the electrode tab and the protection circuit module, and includes a tab receiving portion accommodating the electrode tab, and a coupling portion forming a coupling with the protection circuit module,

The coupling part,

and a thermal bonding portion bonded to the first surface of the protection circuit module, and a coupling portion physically coupled to the second surface of the protection circuit module.

For example, the tab receiving part and the thermal bonding part are disposed on the first surface side of the protection circuit module,

The fastening part 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 part and the coupling part; and

and a second plate bent to face the first plate so that the electrode tab is sandwiched between the first plate and the second plate to cover the electrode tab.

For example, the coupling portion may be formed on both sides of the tab receiving portion.

For example, an opening is formed in the protection circuit module by being drawn in from an edge of the protection circuit module facing the battery cell,

As the connection tab extends across the opening, the coupling portion is coupled to both sides of the opening,

The tab receiving part may be supported in a suspended state from the first surface side of the protection circuit module, and may be exposed to the second surface side through the opening.

For example, the coupling portion may be formed in a symmetrical shape along an incoming direction of the opening.

For example, the coupling portion extends along the inlet direction of the opening,

The thermal bonding portion may be formed at a front end and a rear end of the coupling portion along an incoming direction of the opening, and the coupling portion may be formed at a position between the front and rear thermal bonding portions.

For example, the coupling part,

It is not formed on the innermost side of the electrode tab along the inlet direction of the opening,

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

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

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

For example, the thermal joint is soldered to both sides of the opening,

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

For example, the thermal junction part and the fastening part form different heterogeneous couplings with the first and second surfaces of the protection circuit module, respectively,

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

The fastening portion may extend from the first surface to the second surface through the opening and be in press contact with the second surface.

For example, the fastening part,

a first extension portion bent from the tab receiving portion and extending to a depth beyond the second surface;

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

It may include a contact portion pressed against the second surface at an end of the second extension portion.

For example, the fastening part may further include first and second bending parts bent in opposite directions along a thickness direction of the protection circuit module between the first and second surfaces.

For example, the first and second bent portions may face each other in a 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 can provide elasticity.

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

For example, the battery pack is

It may further include a frame including a cell mounting part for accommodating the battery cell and a circuit mounting part for accommodating the protection circuit module.

For example, the cell mounting unit may be formed on both sides of the circuit mounting unit.

According to the present invention, in the connection tab that mediates the electrical connection between the battery cell and the protection circuit module, the connection tab forms different heterogeneous couplings with respect to the first and second surfaces opposite to each other of the protection circuit module, so that the connection Although the position of the tabs can be fixed firmly, the connection of the connection tabs can be easily achieved through the provisional assembly 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 illustrating the battery cell shown in FIG. 1 .
FIG. 3 is a perspective view illustrating the protection circuit module shown in FIG. 1 .
4 and 5 are different perspective views for explaining the connection tab shown in FIG. 1 .
FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5 .

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 illustrating the battery cell shown in FIG. 1 . FIG. 3 is a perspective view illustrating the protection circuit module shown in FIG. 1 . 4 and 5 are different perspective views for explaining the connection tab shown in FIG. 1 . FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5 .

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

Referring to FIG. 2 , the battery cell 200 may include an electrode assembly (not shown) and a pouch 205 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. After lamination, these laminates may be wound up in the form of a jelly roll. Alternatively, the electrode assembly (not shown) may be manufactured by sequentially stacking 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 electrically connected to the electrode assembly (not shown). The first and second electrode tabs 210 and 220 may be drawn out through the first side portion 201 of the battery cell 200 , and may be electrically connected to the protection circuit module 300 as will be described later.

In this specification, the first and second electrode tabs 210 and 220 may be collectively referred to as an electrode tab 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 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 from which the electrode tabs 210 and 220 are drawn out, and a second side portion 202 formed on the opposite side of the first side portion 201 . and third and fourth side portions 203 and 204 extending in parallel between the first and second side portions 201 and 202 . For example, a terrace from which the electrode tabs 215 are drawn may be formed on the first side portion 201 of the battery cell 200 .

In the embodiment illustrated in FIG. 1 , the battery cells 200 are paired by two, and the battery cells ( 200) may be arranged in a direction facing each other. In this embodiment, the electrode tabs 215 drawn out from each of the battery cells 200 may extend in a direction facing each other and be assembled at 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 are extended in a parallel direction to prevent the protection circuit module 300 from forming. It may also be assembled on one side.

The protection circuit module 300 monitors the operation of the battery cell 200 by measuring state variables of the battery cell 200 such as temperature, voltage, and current, and the battery cell 200 is charged according to the monitored result. , it is possible to perform the function of the control unit for controlling the discharging 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 a set device (not shown) through the protection circuit module 300 . To this end, a connection member 350 for electrical connection with a set device (not shown) may be connected to the protection circuit module 300 . For example, the connection member 350 may include a plurality of wires.

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

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

The frame 100 may have a cell seating portion G for accommodating the battery cells 200 . The cell seating part G may be formed in the form of a recessed recess to define a position in which the battery cell 200 is mounted. For example, the cell mounting part G may define a position at which the battery cell 300 is mounted by the partition wall 100a formed to surround the frame edge. The cell seating portion G may be formed in a concave shape corresponding to the battery cell 200 . The frame 100 may support at least two or more of the plurality of battery cells 200 , and may provide each cell seating portion G surrounded by the partition wall 100a for each battery cell 200 . have.

The frame 100 may be provided with a circuit mounting portion P for accommodating the protection circuit module 300 . The circuit seating portion P may be formed as a groove having a shape corresponding to that of the protection circuit module 300 .

For example, the circuit mounting part P may be formed at an approximately central position of the frame 100 , and the cell mounting parts G may be formed on both sides of the circuit mounting part P as a reference. Since the protection circuit module 300 is electrically connected to the plurality of battery cells 200 , it is disposed at a central position to shorten an electrical connection path.

The cell mounting part G and the circuit mounting part P may be formed separately from each other by the barrier ribs 100a extending across the frame 100 , and each cell mounting part G ) and the battery cell 200 and the protection circuit module 300 accommodated in the circuit seat P can avoid mechanical interference with neighboring components and can be electrically insulated.

Although not shown in the drawings, a strength reinforcement part may be formed in the frame 100 . The strength reinforcing part (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 the frame 100 plane. can Such a strength reinforcing part (not shown) may provide sufficient mechanical rigidity to resist bending or bending deformation while reducing the weight of the entire frame.

For example, the partition wall 100a defining the cell mounting part G and the circuit mounting part P may be formed along the edge of the frame 100 or extend in a direction crossing the frame 100 . It may serve as a strength reinforcing part for reinforcing the mechanical strength of the entire frame 100 . Meanwhile, the frame 100 may be formed by injection molding using an insulating resin as a material.

The frame 100 may include a first surface 101 and a second surface 102 . For example, the battery cell 200 and the protection circuit module 300 are both on the first surface of the frame. It can be assembled from 101. For example, the first and second surfaces 101 and 102 of the frame 100 refer to the main surfaces of the frame 100 and may occupy the largest area among the frame 100 having a substantially rectangular parallelepiped shape.

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 cells 200 are not separated from the frame 100 . For example, the battery cell 200 is seated 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 from becoming The battery cell 200 may be firmly positioned on the frame 100 through the insulating plate 500 disposed on the first surface 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 polyethylene terephthalate (PET), and may be formed in the form of a plate 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 may 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 seated on the connection tab 400 on the protection circuit module 300 . In this case, the electrode tab 215 of the battery cell 200 and the connection tab 400 on the protection circuit module 300 may be welded to each other through a welding electrode (not shown) while overlapping each other. For example, a welding electrode (not shown) approaches each of the welding portions of the electrode tab 215 and the connection tab 400 through the top and bottom of the electrode tab 215 and the connection tab 400 overlapping each other. In more detail, a welding current may be applied through an upper surface of the connection tab 215 and a 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 electrical elements 300E mounted on the circuit board 301 to control charging and discharging operations of the battery cell 200 . can do. In addition, a connection tab 400 connected to the electrode tab 215 of the battery cell 200 may be mounted on the circuit board 301 . For example, the protection circuit module 300 has a circuit board 301 as a skeleton, and a plurality of components, that is, connections on the first and second surfaces S1 and S2 of the circuit board 301 , are connected. The tab 400 and the electrical elements 300E may be mounted, and in this sense, the first surface S1 and the second surface S2 of the protection circuit module 300 are the first surfaces of the circuit board 301 , respectively. It may correspond to the first surface S1 and the second surface S2.

For example, 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 formed to the second surface S2 of the protection circuit module 300 . A plurality of electrical devices 300E for controlling the charging and discharging operations of the battery may be mounted. In this way, the connection tab 400 and the plurality of electrical elements 300E are mounted through different first and second surfaces S1 and S2 of the protection circuit module 300, so that a plurality of components are A structure advantageous for miniaturization and thinness of the mounted protection circuit module 300 may be provided. That is, by utilizing the first and second surfaces S1 and S2 opposite to each other, not one side of the protection circuit module 300 , a plurality of components are efficiently arranged in the limited area of the protection circuit module 300 . may be, 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 one embodiment of the present invention, the connection tab 400 is coupled onto the first surface S1 opposite to the second surface S2 on which the plurality of electrical elements 300E are mounted, thereby being connected to the connection tab 400 . Accordingly, it is possible to prevent an increase in the thickness of the protection circuit module 300 on the second surface S2 on which the plurality of electric elements 300E are mounted. For example, the connection tab 400 is bent in a direction facing the first plate 410 coupled to the protection circuit module 300 and the first plate 410 to form the electrode tab 215 . It includes a second plate 420 that covers, the height or thickness of the second plate 420 bent and extended from the first plate 410 is the second surface S2 on which the plurality of electrical elements 300E are mounted. ) can increase the overall thickness of the protection circuit module 300 from the top. In the present invention, the connection tab 400 is not the second surface S2 of the protection circuit module 300 on which the plurality of electrical elements 300E are disposed, but the first surface S1 of the protection circuit module 300 . By coupling to the side, it is possible to suppress an increase in the overall thickness of the protection circuit module 300 on the second surface S2 , and it is possible to provide a structure advantageous for thinning 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 a welding electrode (not shown) is connected to the connection tab 400 , more specifically, with respect to the tab receiving portion R. make it accessible The opening OP may be formed to be drawn in from an edge of the protection circuit module 300 facing the battery cell 200 , and the opening OP may sufficiently expose the tab receiving part R. It may be formed to a predetermined depth along the retracting direction Z1, and may be formed to have a predetermined width along the width direction Z2 perpendicular to the retracting direction Z1. As the tab receiving portion R exposed through the opening OP, access of a welding electrode (not shown) or laser irradiation is allowed, and thus the electrode tab 215 may be welded together. Bonding pads 300C may be formed on both sides of the opening OP in the width direction, and the protection circuit module 300 and the connection tab 400 are connected through the bonding pads 300C formed on both sides of the opening OP. can be combined with each other. The opening OP may allow the connection tab 400 to form a coupling with respect to the opposite first surface S1 and the second surface S2 of the protection circuit module 300 . This will be described in more detail later.

The connection tab 400 includes a first plate 410 coupled to the protection circuit module 300 and an electrode tab 215 bent from the first plate 410 and interposed between the first plate 410 and the first plate 410 . ) may include a second plate 420 covering the electrode tab 215 to be inserted thereinto. The first plate 410 and the second plate 420 may be connected to each other by a bending part 430 , and the first and second plates 410 and 420 face each other with the electrode tab 215 interposed therebetween. By folding to , the first and second plates 410 and 420 and the electrode tab 215 therebetween are welded to each other in an overlapping state, so that the first and second plates 410 and 420 and the electrode tab 215 are connected to each other. can be firmly coupled. A cutout 430 ′ is formed in the bending portion 430 , so that folding for bending the first and second plates 410 and 420 in a direction facing each other can be easily performed.

The first plate 410 may include a tab accommodating part R for accommodating the electrode tab 215 and coupling parts C formed on both sides of the tab accommodating part R. The tab receiving part R may be formed in the middle 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 . The electrode tab 215 may be interposed between the second plate 420 and the second plate 420 that is folded to face the first plate 410 . The electrode tab 215 and the second plate 420 superimposed on the tab accommodating part R may be coupled to each other through welding, and the tab accommodating part R may be the electrode tab 215 . and to form a welded connection with the electrode tab 215 . To this end, the tab receiving portion R may be exposed through the opening OP of the protection circuit module 300 , and the tab receiving portion R exposed through the opening OP of the protection circuit module 300 . The furnace allows access to a welding electrode (not shown), and laser irradiation may be allowed in non-contact welding such as laser welding. The tab receiving part R may include a concave part W for aligning the positions of the welding electrodes (not shown) and fixing the positions of the welding electrodes (not shown). The concave portions W may be formed in pairs to correspond 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 portions C of the connection tab 400 may be coupled to both sides of the opening OP, and between the coupling portions C The tab receiving part R may be exposed through the opening OP. At this time, the tab receiving portion (R) is suspended from the first surface (S1) side of the protection circuit module 300, that is, the tab receiving portion (R) is a coupling portion ( C) can be supported in a floating state on the side of the first surface (S1) and exposed to the side of the second surface (S2) of the protection circuit module 300 to form a welded connection with the electrode tab (215). can

The coupling portions C may be formed on both sides of the connection tab 400 , and are formed on both sides of the connection tab 400 spanning the opening OP of the protection circuit module 300 to both sides of the opening OP. (more specifically, bonding pad 300C). The coupling portion C may be formed at an edge of the connection tab 400 and span both sides of the opening OP to support the connection tab 400 .

The coupling portion C includes a thermal bonding portion CT and a coupling portion CP that form different heterogeneous couplings with the first and second surfaces S1 and S2 different from each other of the protection circuit module 300 , respectively. can do. For example, the thermal bonding portion CT of the coupling portion C may include a base material or filler metal melted or semi-melted at a high temperature by applying a predetermined heat and pressure. That is, the thermal bonding portion CT is thermally bonded to the first surface S1 of the protection circuit module 300 , and may include, for example, a solidified structure after being melted or semi-melted by a thermal process. More specifically, the thermal bonding portion 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 of the opening OP in the width direction Z2 . The thermal bonding portion CT may be seated on the bonding pad 300C and overlapping the bonding pad 300C, and the thermal bonding portion CT and the bonding pad 300C may be connected to each other through a thermal process such as soldering. can be combined.

The thermal bonding portion CT may be disposed on the same plane as the tab receiving portion R, and may extend from the tab receiving portion R, and may be formed of the protection circuit module 300 together with the tab receiving portion R. It may be disposed on one side (S1) side.

Unlike the thermal bonding part CT, the coupling part CP may be physically or mechanically coupled to the protection circuit module 300 . Here, being physically or mechanically coupled may mean forming a coupling with the protection circuit module 300 through the shape structure of the coupling part CP. More specifically, the fastening part CP may be physically or mechanically fastened to the second surface S2 of the protection circuit module 300 . For example, the connection tab 400 may be coupled from the side of the first surface S1 of the protection circuit module 300 , and the fastening part CP of the connection tab 400 forms the opening OP. The protection circuit module 300 may extend from the first surface S1 side to the second surface S2 side of the protection circuit module 300 and be coupled to both sides of the opening OP of the second surface S2. For example, the fastening part (CP) may be bent from the tab receiving part (R) to extend toward the second surface (S2) side of the protection circuit module 300, and the second surface ( It can be contacted with a predetermined pressure with respect to S2).

Referring to FIG. 6 , the fastening part CP is bent from the tab receiving part R and extending to a depth outside the second surface S2 of the protection circuit module 300 through the opening OP. A first extension part CP1, a second extension part CP2 bent from the first extension part CP1 and extending in a direction toward the second surface S2, and the second extension part CP2 The end portion may include a contact portion CP3 that is pressed into contact with the second surface S2 by a predetermined pressure.

That is, the fastening part CP may be formed in a shape bent twice in opposite directions 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 opposite directions. The first bent part b1 may be bent downward between the tab receiving part R and the first extension part CP1, and the second bent part b2 may include the first extension part ( An upward bending may be formed between CP1) and the second extension part CP2. Here, the thickness direction Z3 of the protection circuit module 300 may mean an up-down direction, or may mean an assembly direction of the connection tab 400 assembled with respect to the protection circuit module 300 .

The fastening part (CP) is bent from the tab receiving part (R) on the first surface (S1) side of the protection circuit module 300 and is coupled to the second surface (S2), and the connection tab 400 is It is possible to provide effective resistance against an external force to separate the connection tab 400 from the first surface S1 to be coupled. For example, the thermal bonding portion CT is thermally bonded to the first surface S1 of the protection circuit module 300, and the connection tab 400 is connected from the first surface S1 to which the connection tab 400 is coupled. Although it is possible to provide a certain amount of resistance to the external force to be separated, it may be difficult to effectively counteract the external force depending on the bonding strength with the first surface S1. Since the fastening part CP is supported and fastened with respect to the second surface S2 of the protection circuit module 300, it is possible to effectively respond to an external force to separate the connection tab 400 from the first surface S1. .

The fastening part (CP) has a structure in which the tab receiving part (R) is bent twice in opposite directions along the vertical direction (Z3), and the tab receiving part (R) on the first surface (S1) side and the second It is possible to elastically connect between the contact portions CP3 on the side of the two surfaces S2. Here, elastically connecting the tab receiving portion R on the first surface S1 side and the contact portion CP3 on the second surface S2 side means the tab receiving portion on the first surface S1 side. (R) and the second surface (S2) to provide an elastic attractive force that pulls the contact portion (CP3) in the opposite direction to each other, the elastic action of this fastening portion (CP), the tab receiving portion (R) The thermal junction CT connected to may be in press-contact with the first surface S1 of the protection circuit module 300 , and the contact portion CP3 may be in press-contact with the second surface S2 . As such, through the fastening portion CP, the thermal bonding portion CT is press-contacted to the first surface S1 side of the protection circuit module 300 , and the contact portion CP3 is the first of the protection circuit module 300 . By press-contacting the two sides (S2) side, the entire connection tab 400 can be tightly coupled to the protection circuit module 300 in close contact.

Referring to FIG. 6 , the fastening part CP may have a structure in which the tab receiving part R is bent twice in opposite directions along the vertical direction Z3, and is bent in opposite directions. It may include first and second bent portions b1 and b2. For example, one end of the first extension part CP1 of the fastening part CP is bent downward from the tab receiving part R on the first surface S1 side, and the first extension part CP1 The second extension part CP2 connected to the other end of the is bent upward and may be connected to the contact part CP3. The bent structure of the fastening part CP can induce elastic deformation that can be stretched and compressed along the up-down direction Z3, for example, the connection tab 400 is the second of the protection circuit module 300 . In the assembly process of the connection tab 400 that is seated on the first surface S1 and at the same time binds the fastening part CP of the connection tab 400 on the second surface S2, it is connected through flexible elastic deformation. The tab 400 can be easily assembled, and the assembled connection tab 400 can be firmly attached to the protection circuit module 300 by the elastic restoring force.

4 and 5 , the coupling portion C may be symmetrically formed along the inlet direction Z1 and the width direction Z2 of the opening OP, and through this, the entire connection tab 400 ) and the protection circuit module 300 may provide a balanced coupling force.

More specifically, along the width direction Z2 of the opening OP, coupling portions C are formed at both ends of the connection tab 400 , and coupling portions C formed at both ends of the connection tab 400 . ) may have symmetrical shapes. That is, along the width direction Z2 of the opening OP, the coupling portion C formed at the left end of the connection tab 400 and the coupling portion C formed at the right end of the connection tab 400 are symmetrical to each other. can be formed negatively. As described above, since the coupling portion C formed at the left end and the coupling portion C formed at the right end of the connection tab 400 along the width direction Z2 of the opening OP are formed symmetrically with each other, the opening ( A balanced coupling force may be provided between the connection tab 400 and the protection circuit module 300 along the width direction Z2 of the OP).

In addition, along the lead-in direction Z1 of the opening OP, both ends of the connection tab 400 , that is, the front end of the coupling portion C, and the rear end of the coupling portion C are thermally bonded CT ) is formed, and a fastening portion CP may be formed at a central position between the thermal bonding portions CT. As described above, since the thermal junction CT and the fastening part CP that form a heterogeneous coupling of the coupling part C are symmetrically formed along the inlet direction Z1 of the opening OP, the opening OP is drawn in. A balanced coupling force may be provided between the connection tab 400 and the protection circuit module 300 along the direction Z1.

The fastening part CP may form a temporary assembly state between the thermal junction part CT and the protection circuit module 300 before thermal bonding of the thermal junction part CT. Regarding the coupling between the connection tab 400 and the protection circuit module 300 , the connection tab 400 may be seated on the opening OP of the protection circuit module 300 , the tab of the connection tab 400 . The receiving portion R is exposed through the opening OP, and the connection tab 400 is connected to the protection circuit module 300 so that the coupling portions C of both sides of the tab receiving portion R span both sides of the opening OP. ) may be seated on the first surface S1. While the connection tab 400 is seated on the first surface S1 of the protection circuit module 300, the coupling portions C on both sides of the tab receiving portion R are connected to the first surface of the protection circuit module 300 ( S1) and to form a contact with the second surface (S2). More specifically, the thermal bonding part CT of the coupling part C is seated on the first surface S1 of the protection circuit module 300, and the coupling part CP of the coupling part C is an opening. Penetrates (OP) to be bound on the second surface (S2).

The fastening part CP elastically connects the tab accommodating part R on the first surface S1 side and the contact part CP3 on the second surface S2 side, so that the column connected to the tab accommodating part R The bonding portion CT may be in press contact with the first surface S1 , and the contact portion CP3 may be in pressure contact with the second surface S2 . Accordingly, the connection tab 400 may form a state temporarily assembled on the protection circuit module 300 , and may provide stable support for thermal bonding of the following thermal bonding portion CT. In a state of being temporarily assembled between the connection tab 400 and the protection circuit module 300, the thermal bonding portion CT of both sides of the tab receiving portion R and the first surface S1 of the protection circuit module 300, more specifically bonding By performing a thermal process such as soldering on the pad 300C), the connection tab 400 may be firmly positioned on the protection circuit module 300 .

A thermal junction CT is formed at the front end and the rear end of the coupling portion C along the inlet direction Z1 of the opening OP, and the coupling portion CP is disposed at a center between the thermal junction parts CT. ) is formed. Accordingly, the fastening part CP may provide stable support for the thermal junction part CT at a position adjacent to the thermal junction part CT, and even before thermal bonding of the thermal junction part CT, the thermal junction part CT. The thermal bonding of the thermal junction CT may be easily achieved by fixing the position between the and the protection circuit module 300 .

As such, the coupling portion C of the connection tab 400 is formed between the front and rear thermal junctions CT and the front and rear thermal junctions CT along the lead-in direction Z1 of the opening OP. may include a fastening part CP of In this regard, the coupling portion C of the connection tab 400 may be symmetrically formed along the inlet direction Z1 of the opening OP. However, in the present invention, assuming that the coupling portion C of the connection tab 400 is symmetrically formed along the inlet direction of the opening OP, the front end portion along the inlet direction Z1 of the opening OP It is not necessary to be limited to a configuration in which the thermal junction CT and the thermal junction CT of the rear end have the same length. For example, in one embodiment of the present invention, the front end, ie, the inner thermal junction CT, along the lead-in direction Z1 of the opening OP is greater than the rear end, ie, the outer thermal junction CT. It may have a relatively long length.

The connection tab 400 includes a tab receiving part R exposed from the opening OP, and a coupling part C spanning both sides of the opening OP and coupled to both sides of the opening OP. The coupling portion C is formed at both ends of the connection tab 400 along the width direction Z2 of the opening OP, and is the outermost portion of the connection tab 400 along the inlet direction Z1 of the opening 400 . It is not formed on the inside.

That is, the coupling between the connection tab 400 and the protection circuit module 300 is made on both sides of the opening OP along the width direction Z2 of the opening OP, and the retraction direction Z1 of the opening OP. ) to the innermost side, that is, the connection tab 400 is not coupled to the innermost side of the opening OP farthest from the edge of the protection circuit module 300 facing the battery cell 200 .

The opening OP may be formed in a form in which one side is opened by being drawn in from an edge of the protection circuit module 300 facing the battery cell 200 , for example, three sides of the opening OP. Among them, 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.

Referring to FIG. 6 , the fastening part CP is bent from the tab receiving part R on the first surface S1 side, passes through the opening OP, and extends toward the second surface S2 side of the protection circuit module It is bound to the second surface (S2) of (300). In this case, the second surface S2 of the protection circuit module 300 to which the fastening part CP is coupled may correspond to a device mounting surface on which a plurality of electric devices 300E are mounted. Among the connection tabs 400, the first surface (S1) side of the protection circuit module 300 has a tab receiving portion (R) and a thermal bonding portion (CT) of the coupling portions (C) of both sides of the tab receiving portion (R); Then, the second plate 420 is disposed. And, among the connection tabs 400 , a fastening part CP among the coupling parts C may be disposed on the second surface S2 side of the protection circuit module 300 .

Since a plurality of electrical elements 300E for controlling the charging and discharging operations of the battery cell 200 are disposed on the second surface S2 of the protection circuit module 300, the second surface of the protection circuit module 300 is The arrangement of the fastening portion CP occupying a smaller area toward the surface S2 may be more effective in efficiently utilizing the mounting space of the protection circuit module 300 .

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, this is merely an example, and various modifications and equivalent other embodiments are possible therefrom by those skilled in the art to which the present invention pertains. point can be understood.

100: frame 200: battery cell
300: protection circuit module 400: connection tap
410: first plate of connection tab 420: second plate of connection tab
430: bending part of the connection tab 430`: cutout
S1: the first side of the protection circuit module S2: the second side of the protection circuit module
R: tab receiving portion W: concave portion
C: joint CT: thermal joint
CP: fastening part CP1: first extension part
CP2: second extension CP3: contact
b1, b2: first and second bent parts OP: opening of the protection circuit module

Claims (19)

a battery cell comprising electrode tabs;
a protection circuit module electrically connected to the electrode tab and including first and second surfaces opposite to each other; and
A connection tab that mediates the electrical connection between the electrode tab and the protection circuit module, and includes a tab receiving portion accommodating the electrode tab, and a coupling portion forming a coupling with the protection circuit module,
The coupling part,
A thermal bonding portion bonded to the first surface of the protection circuit module, and a coupling portion physically fastened to the second surface of the protection circuit module,
An opening is formed in the protection circuit module by being drawn in from an edge of the protection circuit module facing the battery cell,
The thermal junction part and the fastening part of the coupling part are formed at different positions along an incoming direction of the opening part. According to claim 1,
The tab receiving part and the thermal bonding part are disposed on the first surface side of the protection circuit module,
The fastening part extends from the first surface side to the second surface side of the protection circuit module and is fastened on the second surface. According to claim 1,
The tab receiving portion and the thermal bonding portion are connected to each other to form the same plane. According to claim 1,
The connection tab may include: a first plate including the tab receiving part and the coupling part; and
and a second plate bent to face the first plate so that the electrode tab is sandwiched between the first plate and the second plate to cover the electrode tab. According to claim 1,
The coupling portion is a battery pack, characterized in that formed on both sides of the tab receiving portion. According to claim 1,
As the connection tab extends across the opening, the coupling portion is coupled to both sides of the opening,
The tab accommodating part is supported in a suspended state from the first surface side of the protection circuit module, and is exposed to the second surface side through the opening. 7. The method of claim 6,
The battery pack, characterized in that the coupling portion is formed in a symmetrical shape along the inlet direction of the opening. 7. The method of claim 6,
The coupling portion extends along the inlet direction of the opening,
The thermal bonding portion is formed at the front end and the rear end of the coupling portion along the retracting direction of the opening, and the coupling portion is formed at a position between the front and rear thermal bonding portions. 7. The method of claim 6,
The coupling part,
It is not formed on the innermost side of the connection tab along the inlet direction of the opening,
The battery pack, characterized in that formed on both sides of the connection tab along the width direction perpendicular to the retracting direction of the opening. 7. The method of claim 6,
The battery pack, characterized in that the coupling portion is formed in a symmetrical shape along a width direction perpendicular to the retracting direction of the opening. 11. The method of claim 10,
The battery pack, characterized in that along the width direction of the opening, the coupling portion of the left end of the connection tab and the coupling portion of the right end have a symmetrical shape to each other. 7. The method of claim 6,
The thermal bonding portion is soldered to both sides of the opening,
The tab accommodating part is welded to the electrode tab through the opening. 7. The method of claim 6,
The thermal junction part and the fastening part form different heterogeneous couplings with the first and second surfaces of the protection circuit module, respectively,
The thermal joint includes a solidified tissue 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 is in press contact with the second surface. 14. The method of claim 13,
The fastening part,
a first extension portion bent from the tab receiving portion and extending to a depth beyond the second surface;
a second extension portion bent from the first extension portion and extending in a direction toward the second surface; and
and a contact portion that is pressed into contact with the second surface at an end of the second extension portion. 15. The method of claim 14,
The fastening part further includes first and second bent parts bent in opposite directions along a thickness direction of the protection circuit module between the first and second surfaces. 16. The method of claim 15,
The first and second bent portions provide an elastic force in a direction facing each other along a 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 A battery pack, characterized in that. According to claim 1,
A battery pack, characterized in that a plurality of electrical elements are mounted on the second surface of the protection circuit module. According to claim 1,
The battery pack further comprising: a frame including a cell mounting part for accommodating the battery cell; and a circuit mounting part for accommodating the protection circuit module. 19. The method of claim 18,
The battery pack, characterized in that the cell mounting portion is formed on both sides of the circuit mounting portion.

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