KR20090041866A - Battery pack - Google Patents

Abstract

A battery pack is provided to reduce the whole height of a battery pack, and to replace inferior goods when fault is generated in any one of a protection circuit module and electrode terminal. A battery pack comprises a battery cell(10) including a positive terminal(12) and a negative terminal(16) at the top; a positive terminal plate(14) connected to the positive terminal; a negative terminal plate(18) connected to the negative terminal; a protection circuit module(20) which prevents overcharging or over discharge of the battery cell, and is electrically connected to the positive and negative terminal plates; a holder(30) having an opening(32) at a part connected with the negative terminal; and a cover case(40) which is prepared in order to accommodate the protection circuit module, holder, and positive and negative terminal plates, and is connected to the battery cell.

Description

Battery Pack {BATTERY PACK}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack, and more particularly to an inner type battery pack which can reduce the height of the overall battery pack, facilitate replacement in case of failure, and reduce the overall size and weight.

In general, an inner battery pack used as a power source of a portable communication terminal has a structure in which a battery cell and a protection circuit module (PCM) are combined.

Here, the battery cell is 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 the positive electrode terminal and the negative electrode terminal are provided on the outer surface of the casing.

In addition, 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 has a structure in which a battery cell and a protection circuit module are coupled to each other and packaged in a unit form, and such a battery pack has become smaller, thinner, and lighter according to the trend of miniaturization and light weight of a portable communication terminal using the same. It is required.

In accordance with such a requirement, Japanese Laid-Open Patent Publication No. 2002-334686 (hereinafter referred to as prior art) discloses an embodiment of such a battery pack, and the battery pack in the prior art is mounted on a battery cell and a side of the battery cell. The protection circuit module and an electrode terminal for electrically connecting the battery cell and the protection circuit module.

At this time, the protective circuit module and the electrode terminal is fixed integrally with the battery cell by a mold molding portion.

However, the battery pack of the prior art is a method of fixing the protective circuit module and the electrode terminal to the battery cell through the mold molding by the injection of the resin material, there was a considerable difficulty in the manufacture of the battery pack.

In addition, the manufacturing method as described above has a problem in that when the flow defect of the molten resin occurs during the molding of the mold molding part, cracks or pinholes are generated in the mold molding part, and the strength of the mold molding part is weakened.

Due to these problems, there is a disadvantage that the protection for the protection circuit module is not made properly while the mold molded part is easily damaged from an external impact.

In addition, the prior art has a structure in which the protective circuit module and the electrode terminal is integrated into the mold molding part, and even if a defect occurs in any one of the protective circuit module and the electrode terminal, the entire integrated mold molding part needs to be replaced, so that the replacement cost is high. There was an increasing problem.

In addition, in the case of the battery pack according to the prior art, the negative electrode terminal and the positive electrode terminal is disposed on the upper and lower portions of the battery cell consisting of a rectangular front portion, the mounting of the polarizing terminal plate and the protective circuit module for connecting the two, the negative terminal arranged Due to the problem that the size and length of the entire battery pack increases.

Accordingly, it is an object of the present invention to provide a battery pack that can reduce the overall height of the battery pack by providing a bridge-shaped terminal plate that is mounted and connected to the battery pack.

In addition, another object of the present invention is to provide a first protective circuit module opening in the protective circuit module, by welding the positive electrode terminal plate and the positive electrode terminal from the upper through the first protective circuit module opening, it is possible to reduce the electrode insertion space, The present invention provides a battery pack capable of reducing the height of the battery pack.

In addition, another object of the present invention to provide a battery pack that can further improve the mechanical robustness by forming a coupling structure that can prevent the flow between the protective circuit module and the positive electrode terminal plate.

In addition, another object of the present invention is to provide a battery pack that can facilitate the replacement of the defective product, reducing the replacement cost, if any one of the protection circuit module and the electrode terminal.

In addition, another object of the present invention is to provide a battery pack that can reduce the overall weight and size by not using a separate case for covering the circumferential surface of the battery cell.

Battery pack according to the present invention for realizing the object of the present invention as described above, the battery cell including a positive terminal and a negative terminal on the upper surface; A positive electrode terminal plate coupled to the positive electrode terminal; A negative electrode terminal plate coupled to the negative electrode terminal; A protection circuit module that prevents overcharge or overdischarge of the battery cell and is electrically connected to the positive and negative terminal plates; A holder coupled to an upper portion of the battery cell and having an opening at a position coupled to the negative terminal of the battery cell; A cover case provided to accommodate the protection circuit module, the holder, the positive and negative terminal plates, and coupled to the battery cell; And a lower case coupled to a lower portion of the battery cell.

Here, the positive electrode terminal plate may be provided in a bridge shape or a crank shape, one side may be coupled to the protection circuit module, and the other side may be coupled to the positive electrode terminal.

In addition, the protective circuit module includes a first protective circuit module opening in the portion coupled to the positive terminal board, the positive terminal board through the first protective circuit module opening to the positive terminal by spot welding (Spot Welding). Can be combined.

Here, the negative terminal plate is provided in a bridge (Bridge) shape, one side is coupled to the protection circuit module, the other side is accommodated in the holder may be coupled to the negative terminal of the battery cell.

In addition, the protective circuit module includes a second protective circuit module opening portion in the portion coupled with the negative electrode terminal plate, the negative terminal plate through the second protective circuit module opening portion to the negative electrode terminal by spot welding (Spot Welding). Can be combined.

On the other hand, the holder is provided between the protection circuit module and the battery cell, it may be coupled to the upper portion of the battery cell.

In addition, the length of the holder may be provided as the length of the position where the negative terminal is formed from one side of the upper surface of the battery cell.

Here, a fitting protrusion may be formed in the holder, and a fitting groove may be formed in the cover case so that the holder and the cover case may be fitted to each other.

Preferably, the cover case may include an attaching part for fixing the battery cell seen in contact with the battery cell.

As a result, the overall height of the battery pack can be reduced by providing a bridge-shaped terminal plate that is mounted and connected to the battery pack.

Further, by providing a first protective circuit module opening in the protective circuit module and welding the positive electrode terminal plate and the positive terminal at the upper portion through the first protective circuit module opening, the electrode insertion space can be reduced, whereby the height of the battery pack Can be reduced.

In addition, by forming a coupling structure that can prevent the flow between the protective circuit module and the positive electrode terminal plate, it is possible to further improve the mechanical robustness.

In addition, when a defect occurs in any one of the protective circuit module and the electrode terminal, it is easy to replace the defective product, it is possible to reduce the replacement cost.

In addition, since a separate case for covering the circumferential surface of the battery cell is not used, the overall weight and size can be reduced.

In addition, excellent strength can be provided by a cover case which protects the battery cell.

In addition, by the automation of the assembly process, it is possible to mass-produce at the time of manufacturing the battery pack, thereby improving the added value.

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

Prior to this, the terms used in this specification and claims should not be interpreted in a dictionary sense, and the inventors may properly define the concept of terms in order to explain their invention in the best way. It should be construed as meaning and concept consistent with the technical spirit of the present invention.

Therefore, the configurations shown in the embodiments and drawings described herein are only preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It is to be understood that water and variations may exist.

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

1 is an exploded perspective view of a battery pack representing a bridge-shaped positive electrode terminal plate according to the present invention, Figure 2 is a cross-sectional view and a partially enlarged view of a battery pack representing a bridge-shaped positive electrode terminal plate according to the present invention, Figure 3 is a present invention 4 is an exploded perspective view of a battery pack representing a crank-shaped positive electrode terminal plate according to the present invention, FIG. 4 is a cross-sectional view and a partially enlarged view of a battery pack representing a crank-shaped positive electrode terminal plate according to the present invention, and FIG. The combined perspective view.

1 to 5, a battery pack according to the present invention includes a battery cell 10 including a positive electrode terminal 12 and a negative electrode terminal 16 on an upper surface thereof; A positive electrode terminal plate 14 coupled to the positive electrode terminal 12; A negative electrode terminal plate 18 coupled to the negative electrode terminal 16; A protection circuit module 20 which prevents overcharge or overdischarge of the battery cell 10 and is electrically connected to the positive and negative electrode terminal plates 14 and 18; A holder 30 coupled to an upper portion of the battery cell 10 and having an opening formed at a position coupled to the negative electrode terminal 16 of the battery cell 10; A cover case 40 provided to accommodate the protection circuit module 20, the holder 30, and the positive and negative terminal plates 14 and 18 and coupled to the battery cell 10; It includes; lower case 50 is coupled to the lower portion of the battery cell (10).

In this case, the battery cell 10 may be provided in a form in which an electrode laminated unit consisting of a negative electrode sheet and a positive electrode sheet is accommodated in a metal casing.

The battery cell 10 may be provided in various kinds. For example, the battery cell 10 may be provided as a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium ion battery.

Preferably, the battery cell 10 is capable of charging a large-capacity voltage with respect to its size when compared to other batteries, and the power supply is sustainable for a long time after charging, and is composed of one battery for easy management of lithium-ion It may be provided with a battery.

The protection circuit module 20 (PCM) is provided to prevent overcharging or overdischarging of the battery cell 10, and also prevents explosion of the battery cell 10 and inflow of excessive current. It is provided to prevent or to block the short circuit of the terminal provided in the battery cell (10).

That is, the protection circuit module 20 is installed and operated in the battery cell 10 during manufacture to ensure safety from the risk of explosion or the like of the battery cell 10, the service life of the battery cell 10 It is intended to serve as a prolongation.

On the other hand, the positive electrode terminal plate 14 is provided in a bridge shape or crank shape, one side is coupled to the protective circuit module 20 by solder welding, the other side may be coupled to the positive electrode terminal 12.

Here, the bridge shape is a shape in which both sides are parallel and the interruption portion is raised, which is to reduce the overall height of the battery pack while performing electrical connection between the terminals.

In addition, the crank shape is a shape in which the 'b' shape and the 'b' shape overlap each other, and share a height to form an upper surface and a lower surface, respectively, which perform electrical connection between the terminals and at the same time the whole of the battery pack. It is to reduce the height.

Preferably, the positive terminal plate 14 is disposed in the reverse direction, the raised interrupted portion may be coupled to the positive electrode terminal 12, and both sides in parallel may be coupled to the protective circuit module 20.

In addition, as shown in FIGS. 3 and 4, the positive electrode terminal plate 14 provided in the crank shape is coupled to the protective circuit module 20 by soldering welding, and the surface forming the bottom thereof is the positive electrode terminal 12. Can be coupled to.

Here, the protective circuit module 20 further includes a first protective circuit module opening 22 in a portion coupled with the positive terminal board 14, and the positive terminal board through the first protective circuit module opening 22. 14 may be coupled to the positive electrode terminal 12 by spot welding.

In addition, when the positive electrode terminal plate 14 is provided in a crank shape, it is not necessary to form the first protective circuit module opening 22 in forming the protective circuit module 20, whereby the protective circuit module 20 does not need to be extended to the positive electrode terminal 12 portion, which can achieve the effect of material saving and weight reduction in constructing the protective circuit module 20.

Here, the first protective circuit module opening 22 is a space provided so that a welding rod for welding the positive electrode terminal plate 14 and the positive electrode terminal 12 can be inserted from the upper side, and the welding rod is inserted from the side to perform welding. In contrast, since the electrode insertion space does not have to be provided, the overall height of the battery pack can be reduced.

Here, the spot welding is a copper alloy as a method of resistance welding which is applied by applying current to the welding base material, heating the welding base material by the heat generated by the contact resistance of the joint to make the molten state and applying mechanical pressure. It is a method of welding using the electrode provided.

By the welding method, the positive electrode terminal 12, the positive electrode terminal plate 14 and the protective circuit module 20 can be electrically connected.

The holder 30 is coupled to an upper portion of the battery cell to support the negative terminal plate 18 and the protection circuit module 20 to prevent flow.

In addition, the holder 30 may be provided between the protection circuit module 20 and the battery cell 10 and may be coupled to an upper portion of the battery cell 10. In this case, the holder 30 may be provided with an opening 32 to receive the negative electrode terminal plate 18 at a position coupled with the negative electrode terminal 16 of the battery cell 10.

Here, the length of the holder 30 may be provided as the length of the position where the negative electrode terminal is formed from one side (the part without the positive terminal) of the upper surface of the battery cell 10. That is, the length of the holder 30 can be reduced, which can reduce the weight of the overall battery pack.

In addition, the negative electrode terminal plate 18 is provided in a bridge shape, one side is coupled to the protection circuit module 20 by soldering welding, and the other side is accommodated in the opening 32 included in the holder 30. And may be coupled to the negative terminal 16 of the battery cell 10.

Here, the negative electrode terminal plate 18 is provided in a bridge shape, and the negative electrode terminal plate 18 is disposed in a reverse direction so that the raised portions of the bridge contact the negative electrode terminal 16, and thus the negative electrode terminal plate 18 is disposed. And the connection between the negative electrode terminal 16 can be reduced to reduce the thickness portion of the holder 30 itself, which may have the effect of reducing the overall height of the battery pack.

Here, the protective circuit module 20 includes a second protective circuit module opening 24 in the portion coupled with the negative terminal plate 18, the negative terminal board through the second protective circuit module opening 24. 18 may be coupled to the negative electrode terminal 16 by spot welding.

By the welding method, the negative electrode terminal 16 and the negative electrode terminal plate 18 and the protection circuit module 20 may be electrically connected.

The protective circuit module 20, the holder 30, and the positive and negative terminal plates 14 and 18 configured as described above are accommodated by the cover case 40, and the fitting protrusion 34 is provided in the holder 30. Is formed, the cover case 40 is fitted with a fitting groove 42 may be fastened by fitting the holder 30 and the cover case 40. That is, the holder 20 may be supported by the cover case 40 to prevent flow.

The cover case 40 protects the protection circuit module 20 and the positive and negative terminal plates 14 and 18 mounted on the battery cell 10 from external forces, thereby increasing the strength of the overall battery pack. do.

Here, the cover case 40 may include an attaching portion 44 for fixing the battery cell 10 when the cover case 40 is in contact with the battery cell 10, and in this case, the attaching portion 44. The length (D) of may be provided to about 2 millimeters (mm).

Here, the 2 millimeters are intended to illustrate the length (D) of the external part 44, but is not limited thereto, and may have external parts 44 of various lengths, but the external part may be miniaturized for the purpose of miniaturization of a battery pack. The shorter the length of the fitting portion 44 is, the better.

In the battery pack according to the present invention, in order to reduce the length D of the external part 44, the positive electrode terminal plate 14 mounted on the battery cell 10 may have a bridge shape or a crank shape, and the negative electrode terminal plate 18 may be used. By providing a bridge shape to implement the connection of each pole terminal and the protective circuit module (20).

Hereinafter, the coupling process of the battery pack according to the present invention will be described in detail.

First, the holder 30 is coupled to the upper portion of the battery cell 10 by using a double-sided tape or an adhesive. In this case, the opening 32 formed in the holder 30 is located in the negative electrode terminal 16 provided on the upper portion of the battery cell 10, and the negative electrode terminal plate 18 accommodated in the opening 32. The negative electrode terminal 16 is positioned to be in contact.

Next, by a separate process, the positive electrode terminal plate 14 is bonded to the position of the first protective circuit module opening 22 included in the protective circuit module 20 by soldering, and the protective circuit module 20 is The negative electrode terminal plate 18 is joined in a soldering manner to the position of the second protective circuit module opening 24 including the same.

Next, the protective circuit module 20 and the positive and negative electrode terminal plates 14 and 18 coupled through separate processes are seated at corresponding positions of the battery cell 10. In this case, the positive electrode terminal plate 14 corresponds to the positive electrode terminal 12, and the negative electrode terminal plate 18 corresponds to the opening 32 included in the holder 30.

Next, the positive electrode terminal plate 14 and the positive electrode terminal 12 are spot welded to each other through the first protective circuit module opening 22 included in the protective circuit module 20, and the negative terminal plate 18 and the negative electrode. The terminal 16 is spot-welded through the second protective circuit module opening 24 included in the protective circuit module 20. In this case, the spot welding bonding process may be made simultaneously or sequentially, it is preferable to proceed simultaneously.

Next, the fitting protrusions 34 of the holder 30 mounted on the upper part of the battery cell 10 and the fitting grooves 42 of the cover case 40 are mutually fitted to each other, and the lower case 50 at the bottom thereof. Combine.

As mentioned above, although the present invention has been described by way of limited embodiments and drawings, the technical idea of the present invention is not limited thereto, and a person having ordinary skill in the art to which the present invention pertains, Various modifications and variations may be made without departing from the scope of the appended claims.

1 is an exploded perspective view of a battery pack representing a bridge-shaped positive electrode terminal plate according to the present invention,

2 is a cross-sectional view and a partially enlarged view of a battery pack representing a bridge-shaped positive electrode terminal plate according to the present invention,

3 is an exploded perspective view of a battery pack representing a crank-shaped positive electrode terminal plate according to the present invention,

4 is a cross-sectional view and a partially enlarged view of a battery pack representing a crank-shaped positive electrode terminal plate according to the present invention;

5 is a combined perspective view of a battery pack according to the present invention.

Explanation of symbols on the main parts of the drawings

10 battery cell 12 positive terminal

14: positive terminal plate 16: negative terminal

18: negative terminal plate 20: protection circuit module

22: first protective circuit module opening 24: second protective circuit module opening

30 holder 32 opening

34: fitting 40: cover case

42: fitting groove 44: external part

50: lower case

Claims (9)

A battery cell including a positive terminal and a negative terminal on an upper surface thereof; A positive electrode terminal plate coupled to the positive electrode terminal; A negative electrode terminal plate coupled to the negative electrode terminal; A protection circuit module that prevents overcharge or overdischarge of the battery cell and is electrically connected to the positive and negative terminal plates; A holder coupled to an upper portion of the battery cell and having an opening at a position coupled to the negative terminal of the battery cell; A cover case provided to accommodate the protection circuit module, the holder, the positive and negative terminal plates, and coupled to the battery cell; A lower case coupled to a lower portion of the battery cell. The method of claim 1, The positive electrode terminal plate is provided in a bridge shape or crank shape, one side is coupled to the protective circuit module, the other side is a battery pack, characterized in that coupled to the positive terminal. The method of claim 2, The protective circuit module further includes a first protective circuit module opening in a portion coupled to the positive electrode terminal plate, and the positive electrode terminal plate is coupled to the positive electrode terminal by spot welding through the first protective circuit module opening. Battery pack characterized in that. The method of claim 1, The negative terminal plate is provided in a bridge (Bridge) shape, one side is coupled to the protective circuit module, the other side is accommodated in the holder, characterized in that the battery pack, characterized in that coupled to the negative terminal of the battery cell. The method of claim 4, wherein The protective circuit module includes a second protective circuit module opening at a portion coupled to the negative terminal plate, and the negative terminal plate is coupled to the negative electrode terminal by spot welding through the second protective circuit module opening. A battery pack, characterized in that. The method of claim 1, The holder is provided between the protective circuit module and the battery cell, the battery pack, characterized in that coupled to the top of the battery cell. The method of claim 6, The length of the holder is a battery pack, characterized in that provided with the length of the position where the negative terminal is formed from one side of the upper surface of the battery cell. The method of claim 7, wherein The holder is formed with a fitting protrusion, the cover case is formed with a fitting groove is characterized in that the battery pack, characterized in that the holder and the cover case is provided to enable the mutual coupling. The method of claim 8, The cover case is a battery pack, characterized in that it comprises an external portion for fixing the battery cell seen in contact with the battery cell.

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