KR101137506B1 - Battery pack - Google Patents

Abstract

The present invention relates to a battery pack, comprising: a battery cell including a positive terminal and a negative terminal; A protection circuit module electrically connected to the battery cell to prevent overcharge or overdischarge of the battery cell; A positive electrode connecting plate connecting the positive terminal to the protective circuit module; A negative electrode connecting plate connecting the negative electrode terminal to the protective circuit module; A safety device connected to the negative electrode connection plate and the protection circuit module to prevent rupture and explosion due to overheating of the battery cell; A connection support member for electrically connecting the safety device and the protection circuit module; A first lead portion connecting the safety element and the negative electrode connection plate; A second lead portion connecting the safety element and the connection support member; A holder coupled to an upper portion of the battery cell and having an opening formed at a position coupled to a positive terminal and a negative terminal of the battery cell; An upper case provided to accommodate the protection circuit module, the holder, the positive and negative connection plates, the safety device, the connection support member, and the first and second lead parts, the upper case being coupled to the upper part of the battery cell; A lower case coupled to a lower portion of the battery cell, wherein a through hole is formed at a bottom of the positive electrode connection plate and the negative electrode connection plate.

This simplifies the structure of connecting the battery cell and the protection circuit module and at the same time ensures the ease of welding process, thereby reducing the defect rate of the product, and the components forming the support structure between the protection circuit module of the battery cell By uniformly disposing on the upper surface of the cell, it is possible to ensure the mechanical strength of the battery pack.

Battery Packs, Battery Cells, Connection Plates

Description

Battery Pack {BATTERY PACK}

The present invention relates to a battery pack, and more particularly, to a battery pack having a structure that can simplify the structure connecting the battery cell and the protection circuit module and at the same time ensure mechanical strength.

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.

1 is an exploded perspective view of a battery pack according to the prior art.

Referring to FIG. 1, a battery pack according to the related art includes a battery cell 110 including a positive electrode terminal 113 and a negative electrode terminal 111, a protection circuit module 120 including various semiconductor elements, and A holder 130 for supporting the protective circuit module 120, a positive terminal plate 150 and a negative terminal plate for electrically connecting the positive terminal 113 and the negative terminal 111 to the protective circuit module 120 140 and the connection plate 160, the battery cell 110, the protection circuit module 120, the holder 130 and the angular pole terminal plate, the upper case 100 and the battery containing a waterproof tape The lower case 200 covers the lower part of the cell 110 and the cover tape 170 covers the outer surface of the battery cell 110.

Here, the holder 130 supports the protective circuit module 120 and electrically connects the positive terminal 113 and the negative terminal 111 of the battery cell 110 with the protective circuit module 120. It is provided to accommodate the angular pole terminal plate and the connection plate 160.

In the above configuration, the battery pack is completed by combining the upper and lower cases 100 and 200 and the cover tape 170 while the battery cell 110 and the protection circuit module 120 are connected to each other.

However, the above-described conventional battery pack is a structure in which the coupling structure of the positive electrode terminal plate 150 and the connection plate 160 is supported only by one side, and is subjected to torsion and bending performed after the battery pack coupling process is completed. In the strength test according to the present invention, there was a problem in that a failure occurred due to the drop of the positive electrode terminal plate 150 or the connection plate 160 or the electrical connection with the protection circuit module 120.

In addition, since the negative electrode terminal plate 140 is disposed at the center of the battery cell 110 based on the upper surface, and the positive electrode terminal plate 150 and the connection plate 160 are disposed at one side of the upper surface, the battery cell 110 and the protection circuit are located on the other side of the upper surface. Since there is no member other than the holder 130 for supporting and coupling the module 120, there is a problem that the support structure on the other side is poor.

In addition, in the combination of the angular pole terminal plate and the connection plate for electrical connection between the battery cell 110 and the protection circuit module 120, the space in which the electrode can be inserted is limited, the welding process between each component There was a problem that this could not be easily performed.

The present invention has been made to solve the above problems, the object of the present invention is to simplify the structure of connecting the battery cell and the protection circuit module and at the same time ensure the ease of welding process can reduce the defective rate of the product. The present invention provides a battery pack having a structure.

It is still another object of the present invention to provide a battery pack capable of securing mechanical strength of a battery pack by uniformly disposing a component forming a support structure between the protection circuit modules of the battery cell on an upper surface of the battery cell. have.

The object is, according to the present invention, a battery cell comprising a positive terminal and a negative terminal; A protection circuit module electrically connected to the battery cell to prevent overcharge or overdischarge of the battery cell; A positive electrode connecting plate connecting the positive terminal to the protective circuit module; A negative electrode connecting plate connecting the negative electrode terminal to the protective circuit module; A safety device connected to the negative electrode connection plate and the protection circuit module to prevent rupture and explosion due to overheating of the battery cell; A connection support member for electrically connecting the safety device and the protection circuit module; A first lead portion connecting the safety element and the negative electrode connection plate; A second lead portion connecting the safety element and the connection support member; A holder coupled to an upper portion of the battery cell and having an opening formed at a position coupled to a positive terminal and a negative terminal of the battery cell; An upper case provided to accommodate the protection circuit module, the holder, the positive and negative connection plates, the safety device, the connection support member, and the first and second lead parts, the upper case being coupled to the upper part of the battery cell; And a lower case coupled to a lower portion of the battery cell, wherein the bottom surface of the positive electrode connection plate and the negative electrode connection plate may be achieved by a battery pack having a through hole formed therein.

' 형상으로 마련되며, 저면부가 상기 양극단자에 전기적으로 연결되며, 상면부가 상기 보호회로모듈에 전기적으로 연결될 수 있다.Here, the positive electrode connection plate is based on the '

It is provided in a 'shape, the bottom portion may be electrically connected to the positive terminal, the top portion may be electrically connected to the protective circuit module.

' 형상으로 마련되며, 저면부가 상기 음극단자에 전기적으로 연결되며, 상면부가 상기 보호회로모듈에 전기적으로 연결될 수 있다.In addition, the cathode connection plate is based on the front '

It is provided in a 'shape, the bottom portion may be electrically connected to the negative terminal, the top portion may be electrically connected to the protective circuit module.

Here, the cathode connection plate further includes an extension plate extending to one side of the upper surface, the extension plate may be electrically connected to the first lead portion.

Here, the first lead portion may be connected to the upper surface of the safety element, and the second lead portion may be connected to the lower surface of the safety element.

In addition, the connection support member may be disposed on an upper surface of the second lead part to be electrically connected to the protection circuit module.

On the other hand, a plurality of protrusions are formed on the side surface or both side surfaces of the holder, the upper case may be coupled to each other by a coupling groove is formed in a position corresponding to the protrusion.

In addition, the positive and negative connection plates, the connection support member, and the first and second lead portions may be provided with nickel plates.

The safety device may be provided as one of a PTC (Positive Temperature Coefficient) device or a Thermal Breaker device.

On the other hand, the protection circuit module may include a first, second, third through portion formed to insert the electrode in the position where the positive, negative connection plate and the connection support member is coupled.

Here, the protection circuit module may be coupled by spot welding with the positive and negative connection plates, the first and second leads, the connection support member, and the safety device.

In addition, the combined protection circuit module may be disposed on the battery cell and coupled to the positive and negative terminals corresponding to the positive and negative electrode connection plates by spot welding through the first and second through parts. .

According to the present invention, it is possible to simplify the structure of connecting the battery cell and the protection circuit module and at the same time ensure the ease of welding process to reduce the defective rate of the product.

In addition, by uniformly disposing the components forming the support structure between the protection circuit module of the battery cell on the upper surface of the battery cell, it is possible to ensure the mechanical strength of the battery pack.

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

Prior to this, the terms used in the specification and claims should not be construed in a dictionary sense, and the inventor may, on the principle that the concept of a term can be properly defined in order to explain its invention in the best way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments shown in the present specification and the drawings are only exemplary embodiments of the present invention, and not all of the technical ideas of the present invention are presented. Therefore, various equivalents It should be understood that water and variations may exist.

2 is an exploded perspective view of a battery pack according to the present invention, Figure 3 is a bottom perspective view of the protection circuit module and the positive, negative connection plate, the first and second leads, the safety element and the connection support member in accordance with the present invention is combined; 4 is a cross-sectional view of a battery pack according to the present invention, Figure 5 is a perspective view of a combination of the battery pack according to the present invention.

2 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 14; A protection circuit module 20 electrically connected to the battery cell 10 to prevent overcharge or overdischarge of the battery cell 10; A positive electrode connection plate 30 connecting the positive electrode terminal 12 and the protection circuit module 20; A negative electrode connection plate 40 connecting the negative electrode terminal 14 and the protection circuit module 20 to each other; A safety device (50) connected to the negative electrode connection plate (40) and the protection circuit module (20) to prevent rupture and explosion due to overheating of the battery cell (10); A connection support member 60 for electrically connecting the safety element 50 and the protection circuit module 20; A first lead portion 52 connecting the safety element 50 to the negative electrode connection plate 40; A second lead portion 54 connecting the safety element 50 to the connection supporting member 60; A holder 70 coupled to an upper portion of the battery cell 10 and having openings 72 and 74 formed at positions coupled to the positive terminal 12 and the negative terminal 14 of the battery cell 10; The protective circuit module 20, the holder 70, the positive and negative connection plates 30 and 40, the safety element 50, the connection supporting member 60 and the first and second lead portions 52, 54 are accommodated An upper case 80 provided to be coupled to an upper portion of the battery cell 10; And a lower case 90 coupled to a lower portion of the battery cell 10, and through holes 32 and 42 may be formed on bottom surfaces of the positive electrode connection plate 30 and the negative electrode connection plate 40. .

As shown in FIG. 2, a battery pack according to the present invention basically includes a battery cell 10, a protection circuit module 20, a positive electrode connection plate 30, a negative electrode connection plate 40, a safety device 50, Connection support member 60, holder 70, the upper and lower cases 80, 90 are included.

Here, the battery cell 10 is provided with a positive electrode terminal 12 and a negative electrode terminal 14 thereon, the battery cell 10 is 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 It can be prepared as.

Here, the battery cell 10 may be provided in various kinds.

That is, it 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 compared to the size compared to other batteries, the power supply is sustainable for a long time after charging, and is composed of a single battery for easy management The battery cell 10 may be provided.

On the other hand, the protection circuit module 20 is provided to prevent overcharge or over-discharge of the battery cell 10, to prevent the inflow of overcurrent of the battery cell 10, or the positive electrode provided in the battery cell 10 It serves to block a short circuit between the terminal 12 and the negative electrode terminal 14.

That is, the protection circuit module 20 is connected to the battery cell 10 during manufacturing to ensure safety from the abnormality of the battery cell 10, and extends the service life of the battery cell 10 Play a role.

Here, the protection circuit module 20 is the first, second, and third to insert the electrode (r) in the position to be coupled to the negative connection plate (30, 40) and the connection supporting member 60, which will be described later Through portions 22, 24, and 26 may be formed.

' 형상으로 마련되며, 저면부가 상기 양극단자(12)에 연결되며, 상면부가 상기 보호회로모듈(20)에 연결될 수 있다.Here, the positive electrode connection plate 30 is a component for electrically connecting the positive electrode terminal 12 and the protection circuit module 20, and approximately '

It is provided in a 'shape, the bottom portion may be connected to the positive terminal 12, the upper surface portion may be connected to the protective circuit module 20.

Here, by forming the shape of the positive electrode connection plate 30 as described above, the protection circuit module 20 disposed above the battery cell 10 can be more stably supported.

In addition, a through hole 32 may be formed in a bottom portion of the positive electrode connection plate 30.

Here, the through hole 32 is a component formed to secure the resistance of the base material to a predetermined value or more when the positive electrode connection plate 30 and the positive electrode terminal 12 are coupled by spot welding. .

The spot welding presses the overlapping base material with a welding rod (r) and generates heat because the resistance of the contact surface is large when current flows through it, and the temperature of the material increases due to the heat generation, thereby increasing the resistance of the base material itself. As a result, the welding is performed by applying strong pressure thereto.

Here, in order for the spot welding to proceed easily, the resistance of the base material must be secured, and the resistance of the base material increases in proportion to the length of the line through which the current flows.

Therefore, when the through hole 32 is formed in the bottom surface of the positive electrode connection plate 30 and the electrodes are disposed on both sides of the through hole 32 to apply current, the flow of current is shown in FIG. 2. It is formed in the dotted form shown in.

That is, by forming the through-hole 32, it is possible to artificially increase the length of the line of the current flowing between the welding rod (r), thereby increasing the resistance of the base material in proportion to the point welding process reliably Can be performed.

In addition, as the spot welding process is reliably performed, an additional effect of improving the bonding strength of the welded portion between the positive electrode connection plate 30 and the positive electrode terminal 12 may be obtained.

' 형상으로 마련되며, 저면부가 상기 음극단자(14)에 연결되며, 상면부가 상기 보호회로모듈(20)에 연결될 수 있다.On the other hand, the negative electrode connection plate 40 is a component for electrically connecting the negative electrode terminal 14 and the protection circuit module 20, based on the front '

It is provided in a 'shape, the bottom portion may be connected to the negative electrode terminal 14, the upper surface portion may be connected to the protective circuit module 20.

Here, as described above, by forming the shape of the negative electrode connection plate 40, by forming the upper surface portion in contact with the protective circuit module 20 along the longitudinal direction of the protective circuit module 20, The protection circuit module 20 disposed above may be more stably supported.

In addition, a through hole 42 formed therethrough may be formed in the bottom portion of the cathode connection plate 40.

Here, the through hole 42 is a component formed to secure the resistance of the base material to a predetermined value or more when the negative electrode connection plate 40 and the negative electrode terminal 14 are coupled by spot welding. .

That is, by forming the through hole 42, as in the anode connection plate 30 described above, it is possible to artificially increase the length of the line of the current flowing between the welding rods, so that the resistance of the base material also proportionally To be increased so that the spot welding process can be reliably performed.

In addition, the cathode connection plate 40 further includes an extension plate 44 extending to one side of the upper surface, and the extension plate 44 may be electrically connected to the first lead portion 52 to be described later. have.

Here, the first lead portion 52 is a component for electrically connecting the extension plate 44 and the safety element 50 to be described later, the bottom surface of the extension plate 44 and the safety element ( 50) are disposed between the upper surfaces to implement the mutual connection.

Here, the safety device 50 is a component for preventing the explosion and explosion due to overheating of the battery cell 10, preferably, PTC (Positive Temperature Coefficient) or thermal breaker (Thermal Breaker) device It can be provided as either.

Here, the PTC element is an element in which the electrical resistance rises almost infinitely when the temperature exceeds a certain threshold.

Therefore, the PTC device stops charging and discharging currents when the battery reaches a certain temperature or more, thereby preventing the battery from rupturing and igniting. Since the PTC device performs a reversible operation, the PTC device operates to generate a current. After the shutdown, when the temperature of the battery decreases, the resistance of the PTC element decreases again so that the battery can operate normally.

In addition, the thermal breaker element is a device that operates in response to temperature and current using a bimetal. When the battery is overcharged, the temperature of the battery increases, or a short circuit occurs due to an external environment, thereby detecting the excess current. Perform an operation to block the flow of current.

Here, the safety device 50 is connected to the protection circuit module 20 through the second lead portion 54 and the connection support member 60.

Here, the second lead portion 54 is a component for electrically connecting the safety element 50 and the connection support member 60, and may be connected to the lower surface of the safety element 50.

In addition, the connection support member 60 may be disposed on an upper surface of the second lead portion 54 to be electrically connected to the protection circuit module 20.

Here, the connection supporting member 60 is a component disposed on the other side of the upper surface of the battery cell 10 (the opposite side of the positive electrode connection plate), and connects the safety device 50 to the protection circuit module 20. At the same time, the protection circuit module 20 disposed above the battery cell 10 can be more stably supported.

On the other hand, the holder 70 is coupled to the upper portion of the battery cell 10 to seat the positive and negative connection plates 30 and 40, the safety element 50 and the connection support member 60 and at the same time the protection It is provided to support the circuit module 20 to prevent the flow between the components.

Here, the holder 70 may be disposed 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 addition, the holder 70 has openings 72 and 74 for arranging the positive and negative electrode connection plates 30 and 40 at positions coupled with the positive and negative electrode terminals 12 and 14 of the battery cell 10. Can be formed.

As described above, in the battery pack according to the present invention, the positive electrode connection plate 30, the negative electrode connection plate 40, and the connection support member 60 are disposed on one side, the other side, and the stop portion on the upper surface of the battery cell 10. Since the protective circuit module 20 is uniformly supported, the mechanical strength of the battery pack can be improved.

In addition, the positive and negative connection plates 30 and 40, the connection supporting member 60, and the first and second lead portions 52 and 54 may be provided with nickel plates, and the protection circuit module 20 may be The positive and negative connection plates 30 and 40 and the first and second lead portions 52 and 54 may be coupled to the support member 60 and the safety device 50 by spot welding.

In the battery pack according to the present invention, as shown in FIG. 3, first, the positive and negative connection plates 30 and 40, the safety device 50, the connection support member 60, and the first and second lead portions 52, 54) is disposed in the corresponding position on the protective circuit module 20, and then coupled through a spot welding process.

Here, the connection supporting member 60 and the second lead portion 54 performs spot welding by contacting the welding rods from the upper and lower portions through the third through portion 26 of the protection circuit module 20.

Next, the combined protective circuit module 20 is disposed on the upper part of the battery cell 10 to which the holder 70 is coupled, and then the positive and negative electrodes are connected through the first and second through parts 22 and 24. The positive and negative terminals 12 and 14 corresponding to the connection plates 30 and 40 are joined by spot welding.

On the other hand, the battery pack according to the present invention, the upper case 80 is provided to accommodate the above components on the top of the battery cell 10 coupled to the battery cell 10 and the protection circuit module 20, the battery cell The lower case 90 is provided to accommodate the lower portion of the 10.

Here, a plurality of protrusions 76 are formed on the side surfaces or both side surfaces of the holder 70, and the coupling case 86 is formed on the upper case 80 at a position corresponding to the protrusions 76. Can be combined.

In addition, the upper case 80, as shown in Figure 2, may further include a immersion tape 82 for checking whether the battery pack is immersed by the penetration of moisture.

Here, the immersion tape 82 is a label for checking the immersion state, and when immersion occurs in the battery pack, the submerged tape 82 is provided so that the immersion state can be confirmed by the change of color or the bleeding of the mark displayed on the immersion tape 82.

The immersion tape 82 may be attached to an attachment part provided in the upper case 80 to check whether the battery pack is immersed, and may be disposed at various positions of the upper case 80.

In addition, between the lower case 90 and the battery cell 10 is interposed between the two-sided tape coated with an adhesive on both sides, the flow of the battery cell 10 and the lower case 90 by the double-sided tape. This can be prevented.

On the other hand, the battery pack according to the present invention, the protection circuit module 20, the positive and negative connection plates 30 and 40, the safety element 50, the connection support member 60, the holder ( 70 and the upper and lower cases 80 and 90 may be coupled to each other, and may include a label wrapped from the side of the battery cell 10 via the front part and the rear part.

Here, the label prevents flow between components of the battery pack, increases mechanical robustness, and may display one or more of letters, images, or graphics on the outer surface.

That is, it is possible to display a product trademark, a brand name, a second inquiry company, or the like through the letter, image, or graphic.

As described above, the battery pack according to the present invention can simplify the structure connecting the battery cell and the protection circuit module and at the same time ensure the ease of welding process to reduce the defective rate of the product, the protection circuit module of the battery cell By uniformly disposing the components forming the support structure of the liver on the upper surface of the battery cell, it is possible to ensure the mechanical strength of the battery pack.

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 it should be understood by those skilled 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.

Since the accompanying drawings are for understanding the technical spirit of the present invention together with the detailed description of the above-described invention, the present invention should not be construed as limited to the matters shown in the following drawings.

1 is an exploded perspective view of a battery pack according to the prior art,

2 is an exploded perspective view of a battery pack according to the present invention;

3 is a bottom perspective view of the protection circuit module according to the present invention combined with a positive and negative connection plate, first and second lead portions, a safety device, and a connection support member;

4 is a cross-sectional view of a battery pack according to the present invention;

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

* Description of the symbols for the main parts of the drawings *

10: battery cell 20: protection circuit module

30: positive electrode connection plate 40: negative electrode connection plate

50: safety element 60: connection support member

70: holder 80: upper case

90: lower case

Claims (12)

A battery cell comprising a positive terminal and a negative terminal; A protection circuit module electrically connected to the battery cell to prevent overcharge or overdischarge of the battery cell; A positive electrode connecting plate connecting the positive terminal to the protective circuit module; A negative electrode connecting plate connecting the negative electrode terminal to the protective circuit module; A safety device connected to the negative electrode connection plate and the protection circuit module to prevent rupture and explosion due to overheating of the battery cell; A connection support member for electrically connecting the safety device and the protection circuit module; A first lead portion connecting the safety element and the negative electrode connection plate; A second lead portion connecting the safety element and the connection support member; A holder coupled to an upper portion of the battery cell and having an opening formed at a position coupled to a positive terminal and a negative terminal of the battery cell; An upper case provided to accommodate the protection circuit module, the holder, the positive and negative connection plates, the safety device, the connection support member, and the first and second lead parts, the upper case being coupled to the upper part of the battery cell; And a lower case coupled to a lower portion of the battery cell. A battery pack having a through hole formed in a bottom surface of the positive electrode connection plate and the negative electrode connection plate. The method of claim 1, The positive electrode connection plate is based on the '

It is provided in a 'shape, the bottom surface is electrically connected to the positive terminal, the battery pack, characterized in that the top surface is electrically connected to the protective circuit module. The method of claim 1, The negative electrode connection plate is based on the front '

It is provided in a 'shape, the bottom surface is electrically connected to the negative electrode terminal, the battery pack, characterized in that the top surface is electrically connected to the protective circuit module. The method of claim 3, wherein The negative electrode connection plate further includes an extension plate extending to one side of the upper surface, wherein the extension plate is electrically connected to the first lead portion. The method of claim 1, And the first lead part is connected to an upper surface of the safety element, and the second lead part is connected to a lower surface of the safety element. The method of claim 5, The connection support member is disposed on the upper surface of the second lead portion, characterized in that the battery pack is electrically connected with the protective circuit module. The method of claim 1, A plurality of protrusions are formed on side surfaces or both side surfaces of the holder, and the upper case has a coupling groove formed at a position corresponding to the protrusions, wherein the battery pack is coupled to each other. The method of claim 1, And the positive and negative connection plates, the connection support members, and the first and second lead portions are made of nickel plates. The method of claim 1, The safety device is a battery pack, characterized in that any one of a PTC (Positive Temperature Coefficient) device or a thermal breaker (Thermal Breaker) device. The method of claim 1, The protection circuit module includes a battery pack, characterized in that the first, second, third through-holes are formed to insert the electrode in the position where the positive and negative connection plate and the connection support member is coupled. 11. The method of claim 10, The protection circuit module is a battery pack, characterized in that coupled to the positive and negative connection plate and the first and second lead portion and the connection supporting member and the safety element and spot welding. The method of claim 11, The combined protection circuit module is disposed on an upper portion of the battery cell, characterized in that for coupling the positive and negative terminals corresponding to the positive and negative connection plates through the first and second through parts by spot welding.

Images