KR100721830B1 - Battery pack - Google Patents

Abstract

Disclosed is a battery pack that can be easily manufactured, downsized and thinned, and can reliably protect a protection circuit module. The battery pack supplies charged power and has a battery cell having a negative terminal and a positive terminal at the top, a protection circuit module installed at the top of the battery cell and electrically connected to the negative and positive terminals respectively via a terminal plate, and protected at the top. A protective circuit case mounted on the upper part of the battery cell with the circuit module housed therein, an upper cover coupled to the upper part of the battery cell in such a way as to cover the protective circuit case and the upper part of the battery cell, the periphery of the battery cell and the upper cover Bonding to the steel band, the top cover, the battery cell, includes an adhesive tape bonded to the outer surface of the steel band.

Description

Battery pack {BATTERY PACK}

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

2 is a cross-sectional view showing the configuration of a battery pack according to the present invention.

3 is a perspective view showing a part assembled state of the battery pack according to the present invention.

Explanation of symbols on the main parts of the drawings

10: battery cell, 11: negative terminal,

12: positive terminal, 20: protective circuit module,

21: cathode terminal plate, 22: anode terminal plate,

30: protective circuit case, 31: upper receiving space,

32: lower housing space, 40: upper cover,

50: steel band, 51: lower support,

52, 53: side support portion, 54, 55: locking portion,

60: adhesive tape.

The present invention relates to a rechargeable battery pack for use in a mobile phone or a mobile device, and more particularly, to a battery pack capable of miniaturizing a volume and facilitating manufacturing.

 A battery pack used as a power source for a mobile device such as a cell phone or a PDA is configured through a combination of a battery cell and a protection circuit module (PCM).

A typical battery cell has a form in which an electrode laminated unit consisting of a positive electrode sheet and a negative electrode sheet is accommodated in a metal casing, and a positive electrode terminal and a negative electrode terminal are provided on an outer surface of the casing. The protection circuit module is installed outside the battery cell to prevent the risk of explosion and overcharge of the battery. That is, the battery pack is a form in which the battery cell and the protection circuit module are coupled to each other and packaged in a unit form. Such battery packs are required to be smaller, thinner, and lighter according to the trend toward miniaturization and light weight of mobile phones, PDAs, and the like that use them.

Japanese Laid-Open Patent Publication No. 2002-334686 discloses an example of such a battery pack. The battery pack has a battery cell, a protective circuit board (protective circuit module) mounted on the side of the battery cell, and an electrode terminal for electrically connecting the battery cell and the protective circuit board. In addition, the protective circuit board and the electrode terminal are fixed to the battery cell integrally by the mold molding portion.

However, such a battery pack has a problem in that it is difficult to manufacture a battery pack since the protection circuit board and the electrode terminal are fixed to the battery cell through a molding part through injection of a resin material. In addition, in this manufacturing method, if a melt flow occurs during the molding of the mold molding part, cracks or pin holes are formed in the mold molding part, and thus the strength of the mold molding part is weakened. The molded part could easily be broken, so that the protection circuit board could not be reliably protected.

In addition, since the battery pack has a circuit board and an electrode terminal disposed on the side of the battery cell, and a mold molding part is wrapped around the battery pack, the battery pack has a large width and has a limitation in miniaturizing the volume.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and an object of the present invention is to provide a battery pack which can reduce the volume and facilitate the manufacture.

Another object of the present invention is to provide a battery pack which can be miniaturized and reduced in thickness while being able to reliably protect the protection circuit module from impact.

The battery pack according to the present invention for achieving this purpose is to supply a charged power and a battery cell having a negative terminal and a positive terminal on the top, and installed on top of the battery cell and the electrical through the terminal plate and the negative and positive terminals, respectively A protective circuit module connected to the upper portion, a protective circuit case mounted on the battery cell in a state in which the protective circuit module is accommodated thereon, and an upper portion of the battery cell in a form covering the protective circuit case and a part of the upper end of the battery cell; It characterized in that it comprises a top cover coupled to, a steel band for binding the periphery of the battery cover and the periphery of the battery cell, and the adhesive tape adhered to the outer surface of the top cover, the battery cell, the steel band.

In addition, the steel band has a lower support portion for supporting the lower end of the battery cell, two side end support portions extending upward from both ends of the lower support portion, respectively supporting both side ends of the battery cell and both side ends of the upper cover; It characterized in that it comprises a locking portion bent from the upper end of the two side end support portion to be respectively caught on both sides of the upper end of the upper cover.

In addition, the protective circuit case and the upper cover is characterized in that the resin material is provided to enable insulation.

In addition, a plurality of output terminals are provided on the upper surface of the protection circuit module through metal plating, and an opening is formed in the upper cover to expose the plurality of output terminals at positions corresponding to the plurality of output terminals. do.

In addition, the protective circuit case is characterized in that it comprises an upper accommodating space for accommodating the protective circuit module, a lower accommodating space for accommodating the negative terminal and the terminal plate on the top of the battery cell.

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

1 and 2, the battery pack according to the present invention, the chargeable battery cell 10, the protection circuit module 20, the protection circuit module 20 for the protection of the battery cell 10, It includes a protective circuit case 30, an upper cover 40, a steel band 50, and an adhesive tape 60 adhered to the outside.

Although not shown in the drawings, the battery cell 10 is formed in a form in which an electrode laminated unit consisting of a positive electrode sheet and a negative electrode sheet is accommodated in a metal casing. The battery cell 10 includes a negative electrode terminal 11 protruding from the upper center portion, and is configured such that the entire outer surface of the casing except the negative electrode terminal 11 forms the positive electrode terminal 12.

The protection circuit module 20 is a circuit board for protecting the battery cell 10 from explosion and overcharge risks. The protective circuit module 20 is connected to the negative terminal 11 of the battery cell 10 through the negative terminal plate 21, and the positive terminal 12 on the top of the battery cell 10 through the positive terminal plate 22. Connected. The negative electrode and positive electrode terminal plates 21 and 22 are for power connection and are provided through bending molding of copper or nickel plates. The negative electrode and the positive electrode terminal plates 21 and 22 have a predetermined elasticity and are closely connected to the protective circuit module 20 and the terminals 11 and 12 of the battery cell 10 or to perform spot welding on the battery cell 10 side. Can be connected via.

The protective circuit case 30 includes an upper accommodating space 31 corresponding to an outer shape of the protective circuit module 20 to accommodate the protective circuit module 20 without shaking. In addition, the protection circuit case 30 has a cross-sectional area corresponding to the area of the upper end of the battery cell 10 so that it can be stably coupled to the upper part of the battery cell 10, the lower part of the negative electrode and the positive electrode terminal plates (21, 22) and the battery A lower accommodating space 32 capable of accommodating the negative electrode terminal 11 of the cell 10 is provided. This accommodates the cathode and anode terminal plates 21 and 22 therein through the lower accommodation space 32 to support them without shaking, and at the same time, the lower circumference of the protective circuit case 30 is closely coupled to the upper end of the battery cell 10. I would have to. In addition, the protective circuit case 30 is provided through injection molding of a resin material that can be electrically insulated, the negative electrode extending from the battery cell 10 side toward the protective circuit module 20 on one side of the protective circuit case 30. And support grooves 33 and 34 for receiving and supporting a part of the anode terminal plates 21 and 22.

The protective circuit case 30 couples the negative and positive terminal plates 21 and 22 to the support grooves 33 and 34, and mounts the protective circuit module 20 in the upper accommodating space 31. It is to be mounted on the top of 10). When the protective circuit case 30 is installed in this way, the protective circuit module 20 is accommodated in the upper portion of the protective circuit case 30, and the negative and positive terminal plates 21 and 22 are also bound to the correct positions, so the protection is performed. The power supply connection between the protection circuit module 20 and the battery cell 10 is accurately made by simply mounting the circuit case 30 on the battery cell 10. In addition, since the protective circuit case 30 is an insulating material, it is possible to prevent an electrical short (short) without using a separate insulating sheet or the like, to accommodate the protective circuit module 20 in the upper accommodation space (31). Therefore, the protection circuit module 20 can be reliably protected from external shocks and the like.

The upper cover 40 is coupled to the upper portion of the battery cell 10 in such a manner as to cover the protective circuit case 30 accommodating the protective circuit module 20 and the upper portion of the battery cell 10. The upper cover 40 is to allow the protective circuit case 30 to be coupled to the upper part of the battery cell 10 through easy coupling, the protective circuit module 20, the protective circuit case 30, the negative electrode and the positive terminal plate The protection circuit module 20 can be more stably protected by allowing 21 and 22 to be completely accommodated in the upper cover 40 and preventing their shaking.

The steel band 50 binds the circumference of the battery cell 10 and the circumference of the upper cover 40 so that the upper cover 40 can be fixed to the upper portion of the battery cell 10. The steel band 50 extends upwardly from both ends of the lower support part 51 and the lower support part 51 supporting the lower end of the battery cell 10, and both side ends and the upper cover 40 of the battery cell 10. Two side end supporting portions 52 and 53 for supporting both side ends of the < RTI ID = 0.0 >) < / RTI > and engaging portions 54, 55 bent from the upper ends of the two side end supporting portions 52 and 53 so as to be caught on both sides of the upper end of the upper cover 40, respectively. ). On the other hand, since the steel band 50 is a metal material capable of flowing electricity, in order to prevent electrical short of the battery pack, the upper cover 40 should be made of a resin material that can insulate.

Since the steel band 50 is a type that binds the periphery of the battery cell 10 and the periphery of the upper cover 40, the periphery and the lower edge portion of the battery cell 10 and the upper edge portion of the upper cover 40. I can reinforce it. Therefore, the battery pack can be reliably protected even when an external shock (especially a drop of the battery pack) is applied to the battery pack. In addition, since the steel band 50 is formed to bind only the circumference, the battery pack can be miniaturized, thinned, and lightweight.

In addition, as shown in FIG. 1, a plurality of output terminal portions 24 are provided on the upper surface of the protection circuit module 20 through gold plating, and the upper cover 40 corresponds to the plurality of output terminal portions 24. Openings 44 are formed so that the plurality of output terminal portions 24 are exposed at the positions. This allows the output terminal 24 of the protection circuit module 20 to be exposed to the outside through the opening 44 when the upper cover 40 is coupled so as to be connected to a power connection such as a mobile phone.

Adhesive tape 60, the label tape is attached to the upper cover 40 and the steel band 50 is finally attached to the form surrounding the outer surface 40, the steel band 50, the battery cell 10 Functions to strengthen the external solidarity.

Next, a method of assembling a battery pack according to the present invention will be described.

When assembling the battery pack, the protective circuit module 20 and the negative and positive terminal plates 21 and 22 are coupled to the protective circuit case 30. The protective circuit case 30 is positioned above the battery cell 10, and the upper cover 40 is coupled. At this time, since the protective circuit module 20 is accommodated in the protective circuit case 30 and the protective circuit case 30 is accommodated in the upper cover 40 again, it is stably protected. In addition, the protection circuit module 20, the protection circuit case 30, the negative electrode and the positive electrode terminal plates (21, 22) are mounted in the correct position without shaking, and the battery cell (10) and the protection circuit module (20) are electrically connected. Is connected.

After the upper cover 40 is coupled, as shown in Figure 3, by installing the steel band 50, the upper cover 40 is to be bound to the top of the battery cell (10). After the upper cover 40 and the steel band 50 are combined, the assembly is finally completed by attaching the adhesive tape 60.

As described in detail above, the battery pack according to the present invention is to mount a protective circuit module and a negative electrode and a positive terminal plate on the protective circuit case and to place it on the upper battery cell and then to combine the top cover and the steel band to the battery cell, respectively. Because most of the assembly procedures can be completed, battery packs can be easily manufactured and have a stable quality. In addition, since the manufacturing process is simple, assembly labor can be reduced, thereby reducing manufacturing costs and increasing productivity.

In addition, the battery pack according to the present invention is coupled to the upper part of the battery cell in a state in which the protective circuit module is accommodated in the protective circuit case, since the protective circuit case is completely accommodated in the upper cover, it can reliably protect the protective circuit module from external impacts. It has an effect.

In addition, since the battery pack according to the present invention is installed in a form in which the steel band surrounds the upper cover and the periphery of the battery cell, the battery pack can not only reinforce the periphery and the corner parts that are vulnerable to external shocks (especially the fall of the battery pack). The miniaturization, thinning, and weight reduction can be achieved.

Claims (5)

A battery cell for supplying charged power and having a negative terminal and a positive terminal at the top, a protective circuit module installed at an upper portion of the battery cell and electrically connected to each of the negative and positive terminals through a terminal plate; A protective circuit case mounted on the battery cell in a state in which the module is accommodated, an upper cover coupled to the upper part of the battery cell in such a manner as to cover the protective circuit case and the upper part of the battery cell, and a circumference of the battery cell; A battery pack comprising a steel band for binding the periphery of the upper cover, and an adhesive tape bonded to the outer surface of the upper cover, the battery cell, and the steel band. The method of claim 1, The steel band includes a lower support part for supporting a lower end of the battery cell, two side end support parts respectively extending upward from both ends of the lower support part and supporting both side ends of the battery cell and both side ends of the upper cover; A battery pack comprising a hook portion bent from the upper end of the two side end support portion to be respectively caught on both sides of the upper end of the upper cover. The method according to claim 1 or 2, The protective circuit case and the upper cover is a battery pack, characterized in that provided with a resin material to enable insulation. The method of claim 1, A plurality of output terminals are provided on the upper surface of the protection circuit module through metal plating, and an opening is formed in the upper cover to expose the plurality of output terminals at positions corresponding to the plurality of output terminals. Battery pack. The method of claim 1, The protective circuit case includes an upper accommodating space for accommodating the protective circuit module, and a lower accommodating space for accommodating the negative terminal and the terminal plates above the battery cell.

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