KR20070033837A - Pack battery - Google Patents

Abstract

The pack battery of the present invention includes a bare cell having an external terminal, an upper case having an external terminal exposing hole so that the external terminal is exposed at one side, a lower case having a bare cell housed therein, and engaged with an end of the upper case; Since the molding material is injected between the upper case and the bare cell, the pack case may be coupled and the external terminal of the secondary battery may be accurately exposed through the external terminal exposure hole of the pack case.

Rechargeable Battery, Pack Case, Pack Battery, External Terminal

Description

Pack Battery {PACK SECONDARY BATTERY}

1 is a view illustrating a general secondary battery,

2 is an exploded perspective view showing an embodiment of a rechargeable battery and a pack case according to the present invention;

3 is a view illustrating an embodiment of a battery pack mounted with a secondary battery in a pack case according to the present invention;

4 is a view showing another embodiment of a battery pack equipped with a secondary battery in a pack case according to the invention,

5 is a view showing another embodiment of a pack case according to the present invention,

6 is a view showing another embodiment of a pack case according to the present invention.

<Brief Description of Major Codes in Drawings>

400: pack case 410: lower case

420: upper case 421: external terminal exposure hole

425: molding material injection hole 430: molding material

The present invention relates to a pack battery, and more particularly, to a pack battery having a standardized size by receiving a bare cell in the pack case.

Recently, compact and lightweight electric / electronic devices such as cellular phones, notebook computers, camcorders, etc. have been actively developed and produced. These portable electric / electronic devices have a built-in pack battery so that they can be operated even in a place where a separate power source is not provided. The built-in pack battery includes at least one secondary battery therein for outputting a predetermined level of voltage for driving the portable electric / electronic device for a certain period of time.

In view of economical aspects, such secondary batteries may be charged and discharged in recent years, and typically include nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion ( And lithium secondary batteries such as Li-ion) batteries.

These secondary batteries are formed by housing an electrode assembly, most of which is composed of a positive electrode, a negative electrode, and a separator, and closing the case with a cap assembly, injecting and sealing an electrolyte solution into the case.

A pack battery constructed by using a plurality of such secondary batteries generally includes a plurality of batteries, wiring circuits for electrically connecting these batteries, safety elements, contact terminals, etc. in a pack battery container (case) having battery insulation. It is a structure.

That is, the sealed secondary battery is stored in a separate pack while being connected to safety devices such as a PTC element, a thermal fuse, a protective circuit module (PCM) and other battery parts. do. Alternatively, the secondary battery, the protection circuit board, and the other battery parts are connected to each other, and the gap therebetween is filled with the molding resin, and fixed or coated together to form a pack battery.

The safety devices are connected to the positive and negative terminals of the secondary battery by a conductor structure called a lead, and the battery is ruptured by blocking the current when the battery voltage rises rapidly due to the high temperature of the battery or excessive charge or discharge. Back to prevent danger.

Secondary batteries are connected to safety devices, and external terminals are formed in the safety device so as to be electrically connected to the outside.

However, such a pack battery has a problem in that external terminals and the pack case are not smoothly accommodated when the pack case is accommodated in the secondary battery. That is, the pack case communicates with the external terminal and the external terminal hole so that the external terminal of the secondary battery is exposed through the external terminal hole formed in the pack case as the pack case is fixed to the secondary battery through the molding material when the secondary battery is accommodated. Very difficult to match.

The present invention has been made to solve the above-described problems, an object of the present invention is to provide a pack battery having a pack case that can be coupled to the outer terminal hole of the pack case and the outer terminal of the secondary battery correspondingly. will be.

The present invention for achieving the above object is a bare cell having an external terminal, an upper case formed with an external terminal exposure hole to expose the external terminal on one side, and the bare cell is accommodated inside the end of the upper case It provides a pack battery including a lower case that is engaged with and a molding material injected between the upper case and the bare cell.

The upper case and the lower case may be combined to form an uneven portion corresponding to each other.

The upper case or the lower case is preferably formed with a molding material injection hole for injecting the molding material.

When the upper case and the lower case are combined, a molding material injection hole through which a molding material may be injected may be formed.

The upper case may be formed so that at least one surface has a curved surface.

In addition, the present invention is a bare cell having an external terminal, an external terminal exposure hole is formed on one side so that the external terminal is exposed and the case is in contact with one surface of the bare cell and is injected between the case and the bare cell Provided is a pack battery comprising a molding material.

The upper case is preferably formed so that at least one surface has a curved surface.

Molding material injection hole may be formed in the case.

The bare cell may be formed in a rectangular can type, a cylindrical shape, or a pouch type.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a general secondary battery, Figure 2 is an exploded perspective view showing an embodiment of a secondary battery and a pack case according to the present invention.

As shown in these drawings, the pack battery includes a secondary battery 300 having an external terminal 183 and a pack case 400 in which at least two secondary batteries 300 can be mounted.

The pack case 400 includes an upper case 420 having an external terminal exposing hole 421 formed thereon so that the external terminal 183 of the secondary battery 300 is exposed on one side thereof, and a secondary battery 300 housed therein. The lower case 410 is engaged with the end of the case 420.

Here, the molding material 430 is injected between the upper case 420 and the secondary battery 300 to combine the upper case 420 and the secondary battery 300.

The secondary battery 300 is coupled to an opening 200 of the case 200, an electrode assembly 250 accommodated inside the case 200, and an opening 201 of the case 200, and opens an upper end of the case 200. And a cap assembly 100 for sealing.

In the embodiment shown in FIG. 1, the case 200 is formed of aluminum or an aluminum alloy having a substantially rectangular box shape to accommodate the electrode assembly 250 and the electrolyte through the opening 201 of the case 200. The case 200 may itself serve as an electrode terminal of any one of the first and second electrodes 215 and 225.

At this time, the case 200 is not shown, but may be formed in a cylindrical or pouch type.

The electrode assembly 250 is formed in a thin plate or film form and has a first electrode 210, a separator 230, and a second electrode 220 provided with the second electrode tab 225 connected to the first electrode tab 215. The laminate is formed by winding in a spiral shape. In this case, the first and second electrodes 210 and 220 may be a cathode or an anode. Here, it is preferable that the first electrode 210 is typically a cathode.

The negative electrode includes a negative electrode current collector made of a conductive metal sheet, such as a copper foil, and a negative electrode active material layer mainly composed of a carbon material coated on both surfaces thereof. The negative electrode terminal is connected to the region of the negative electrode current collector in which the negative electrode active material layer is not formed in the negative electrode, and is led out.

The positive electrode includes a positive electrode current collector made of a thin metal plate such as aluminum foil having excellent conductivity, and a positive electrode active material layer coated on both surfaces thereof and having a lithium oxide as a main component. The positive electrode is led out to the upper side of the positive electrode terminal electrically connected to a region of the positive electrode current collector where the positive electrode active material layer is not formed.

The separator 230 is made of polyethylene, polypropylene, or a copolymer of polyethylene and polypropylene (Co-Polymer), and is formed wider than the first and second electrodes 210 and 220 to short-circuit between the electrode plates. It is advantageous to prevent.

The cap assembly 100 is a case 200 covers and seals the opening 201, and is provided with a flat cap plate 110 having a size and a shape corresponding to the opening 201 of the case 200. . An insulating plate 140 is installed on the lower surface of the cap plate 110, and a terminal plate 150 electrically connected to the first electrode tab 215 provided on the first electrode 210 on the lower surface of the insulating plate 140. ) Is installed.

The cap plate 110 has a first terminal through-hole 111 connected to the first electrode tab 215 by penetrating the electrode terminal 130 at a central portion thereof, and an electrode terminal 130 in the first terminal through-hole 111. A tubular gasket 120 is installed to electrically insulate the cap plate 110 from each other.

In addition, an electrolyte injection hole 113 of a predetermined size is formed at one side of the cap plate 110. The electrolyte injection hole 113 is sealed by the stopper 115 when the cap assembly 100 is assembled to the upper opening 201 of the case 200 and the electrolyte is injected through the electrolyte injection hole 113.

The safety vent 117 is formed at the other side of the cap plate 110. Safety vent 117 is generally formed on the upper surface of the cap plate 110 and may be in the form of a groove formed thinner than the thickness of the cap plate (110).

The insulating plate 140 is formed of an insulating material such as the gasket 120 and is coupled to the bottom surface of the cap plate 110. The insulating plate 140 is formed to correspond to and communicate with the first terminal through-hole 111 of the cap plate 110 is a second terminal through-hole 141 is formed.

The terminal plate 150 is formed of Ni metal or an alloy thereof, and is coupled to the lower surface of the insulating plate 140. The terminal plate 150 has a third terminal through hole 151 corresponding to the first terminal through hole 111 of the cap plate 110.

In addition, the insulating case 160 is installed on the upper side of the electrode assembly 250 to insulate the electrode assembly 250 from the cap plate 110 and passes through the first and second electrode tabs 215 and 225. Two electrode tab through holes 163 and 165 are formed. The material of the insulating case 160 is an insulating polymer resin, preferably made of polypropylene, but is not limited to the material in the embodiment of the present invention.

The secondary battery 300 as described above is connected to the first and second electrode tabs 215 and 225 drawn from the electrode assembly 250, the cap plate 110, and the electrode terminal 130, and the cap plate 110 and the electrode terminal. 130 are connected to the protection circuit board 180 via the first and second electrode leads 185 and 187, respectively. The protection circuit board 180 is provided with an external terminal 183 connecting the secondary battery 300 and the outside.

As shown in FIG. 2, the secondary battery 300 is accommodated in the lower case 410 of the pack case 400, and the lower case 410 is covered by the upper case 420.

As shown in FIG. 3, the pack case 400 has a molding material injection hole 425 formed in the upper case 420 or the lower case 410 to inject the molding material 430. In addition, as shown in Figure 4, the molding material inlet 425a is formed in each of the grooves at the end of the upper case 420 and the lower case 410, the upper case 420 and the lower case 410 is coupled May be formed alone.

In this case, the upper case 420 may be formed such that at least one surface has a curved surface according to the shape of the electronic product to which the pack battery is applied.

Here, an external terminal exposure hole 421 is formed in the upper case 420 of the pack case 400 to expose the external terminal 183 of the protective circuit board 180. When the length of the upper case 420 is combined with the lower case 410, the electrode terminal and the protective circuit board () may be exposed to expose the external terminal 183 of the protective circuit board 180 through the external terminal exposure hole 421. In view of the length between 180) is preferably formed.

As illustrated in FIG. 5, the upper case 420 and the lower case 410 may have uneven portions 413 and 423 corresponding to each end so that the end portions are engaged with each other to stabilize the coupling thereof.

Thus, the pack battery accommodates the secondary battery 300 connected to the protective circuit board 180 in the lower case 410 of the pack case 400, and then the uneven groove 423 of the upper case 420 is the lower case ( The upper case 420 and the lower case 410 are coupled to engage the uneven groove 413 of the 410.

In this case, the external terminal exposing hole 421 of the upper case 421 exposes the external terminal 183 of the protective circuit board 180 connected through the electrode terminal 130 and the electrode leads 185 and 187.

When the external terminal 183 is exposed, the molding material 430 is injected through the molding material injection holes 425 and 425a to fix the position of the protective circuit board 180.

Meanwhile, as another embodiment of the pack case 400, as shown in FIG. 6, only the case 450 covering only the upper side of the secondary battery 300 without the lower case 420 may be formed. An end portion of the case 450 is formed to be in contact with the upper edge portion of the cap plate 110, and a molding material injection hole 425b and an external terminal exposure hole 421a are formed on one side thereof.

In the present invention, in the pack case in which the secondary battery is installed, the pack case is coupled and the external terminal of the secondary battery can be accurately exposed through the external terminal exposure hole of the pack case.

As described above, the present invention is not limited to the specific preferred embodiments described above, and those skilled in the art without departing from the gist of the present invention as claimed in the following claims. Anyone may implement various modifications, and such changes are within the scope of the claims.

Claims (11)

A bare cell having an external terminal; An upper case formed with an external terminal exposure hole to expose the external terminal at one side; A lower case accommodating the bare cell therein and engaged with an end of the upper case; And A pack battery comprising a molding material injected between the upper case and the bare cell. The method of claim 1, The upper case and the lower case is a pack battery, characterized in that coupled to each other forming an uneven portion. The method of claim 1, The battery pack pack, characterized in that the upper case or the lower case is formed with a molding material injection hole for injecting the molding material. The method of claim 1, The upper case and the lower case is a pack battery, characterized in that a molding material injection hole is formed that can be injected into the molding material. The method of claim 1, The upper case is a pack battery, characterized in that formed on at least one surface having a curved surface. A bare cell having an external terminal; A case in which an external terminal exposing hole is formed at one side thereof so as to expose the external terminal and in contact with one surface of the bare cell; And A pack battery comprising a molding material injected between the case and the bare cell. The method of claim 6, The upper case is a pack battery, characterized in that formed on at least one surface having a curved surface. The method of claim 6, The case pack battery, characterized in that the molding material injection hole is formed. The method of claim 6, The bare cell is a rectangular battery, characterized in that the pack battery. The method of claim 6, The bare cell is a pack battery, characterized in that the cylindrical. The method of claim 6, The bare cell pack battery, characterized in that the pouch type.

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