KR20160147366A - Battery Pack Including Electrode Lead Being Extended Along External Surface of Battery Cell - Google Patents

Abstract

The present invention relates to a battery cell in which an electrode assembly having a positive electrode, a positive electrode, a negative electrode, and a separator interposed between an anode and a cathode is embedded in a battery case together with an electrolyte solution; A first electrode lead connected to one end of the battery cell and extending along the outer surface of the battery cell in a bent state toward the other end of the battery cell; A second electrode lead connected to the other end of the battery cell and extending along an outer surface of the battery cell in a bent state toward one end of the battery cell; A first cover tape having a structure that at least part of a first electrode lead is wrapped on a side surface of the battery cell; And a second cover tape having a structure that surrounds at least a part of the second electrode lead on the side surface of the battery cell.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack including an electrode lead extending along an outer surface of a battery cell,

The present invention relates to a battery cell including an electrode lead extending along the outer surface of the battery cell.

As technology development and demand for mobile devices have increased, the demand for secondary batteries as energy sources has been rapidly increasing. Many researches have been conducted on lithium secondary batteries with high energy density and discharge voltage among such secondary batteries. .

The secondary battery is classified into a cylindrical battery and a prismatic battery in which the electrode assembly is housed in a cylindrical or rectangular metal can according to the shape of the battery case, and a pouch-shaped battery in which the electrode assembly is housed in a pouch-shaped case of an aluminum laminate sheet . Among them, the cylindrical battery has a relatively large capacity and is structurally stable.

The electrode assembly incorporated in the battery case is a charge / dischargeable electric device composed of a lamination structure of a positive electrode / separator / negative electrode. The electrode assembly is composed of a jelly-roll type in which a separator is interposed between a positive electrode and a negative electrode coated with an active material, Sized positive and negative electrodes are stacked in a stacked state in a state in which a separator is interposed therebetween. Among them, the jelly-roll type electrode assembly has an advantage of being easy to manufacture and having a high energy density per weight.

Specifically, the cylindrical battery has a structure in which a jelly-roll type electrode assembly is embedded in a cylindrical metal can having an open upper end together with an electrolytic solution, and a cap assembly is mounted on an open upper end of the metal can to seal the battery. The anode of the electrode assembly is connected to the upper end of the cap assembly to form a cathode terminal, and the anode of the electrode assembly is connected to the metal can, and the side surface of the metal can is surrounded by the insulating sheet to insulate the anode can. .

Such cylindrical batteries are rapidly increasing in demand for wearable products of the smart device market. In particular, the wearable product family requires a very small cylindrical battery, depending on portability and various design requirements.

However, the structure of most conventional cylindrical batteries is difficult to meet the requirements of such a wearable product group.

That is, the conventional cylindrical battery has a structure in which the upper end surface and the lower end surface are respectively formed as electrode terminals, so that the battery contact portion inside the device is electrically connected to the device on which the battery is mounted, , Which leads to a problem that makes the internal design of the device difficult in a wearable product group that emphasizes portability and diversity.

Therefore, a battery cell capable of solving the above problems is very necessary.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

Specifically, an object of the present invention is to provide a battery pack mounted on a device requiring a very small battery for portability and various designs, which can be mounted in a narrow space inside the device, And to provide a battery pack that can be easily and flexibly connected and can be mounted and adjusted only in electrical connection parts to devices of various specifications.

According to an aspect of the present invention, there is provided a battery pack comprising:

A battery cell in which an electrode assembly having a positive electrode, a negative electrode, and a separator interposed between an anode and a cathode is embedded in a battery case together with an electrolyte;

A first electrode lead connected to one end of the battery cell and extending along the outer surface of the battery cell in a bent state toward the other end of the battery cell;

A second electrode lead connected to the other end of the battery cell and extending along an outer surface of the battery cell in a bent state toward one end of the battery cell;

A first cover tape having a structure that at least part of a first electrode lead is wrapped on a side surface of the battery cell; And

A second cover tape having a structure that at least part of the second electrode lead is wrapped around the side surface of the battery cell;

As shown in FIG.

Therefore, the battery pack according to the present invention includes the electrode leads extending along the outer surface of the battery cell, so that the electrical connection between the battery pack and the device can be achieved even if the space inside the device in which the battery pack is mounted is narrow , It is possible to provide an environment in which the design of the internal space of the device in which the battery pack according to the present invention is embedded can be designed in a flexible manner according to portability and various designs.

In one embodiment of the present invention, the electrode assembly may be a jelly-roll type electrode assembly formed by winding a separator interposed between an anode and a cathode in the form of a sheet, and a cathode and a cathode.

Specifically, the battery case may be a cylindrical metal can. The cathode may be connected to the metal can, and the metal can connected to the cathode may function as an anode terminal by itself.

In order to insulate the outer surface of the battery case excluding the lower end surface, the outer surface of the battery case may be surrounded by an insulating label. Specifically, the side surface portions of the battery case excluding the upper and lower surfaces thereof may be surrounded by an insulating label.

An insulating tape may be added between the outer surface of the battery case and the first electrode lead and the second electrode lead. The first electrode lead and the second electrode lead are made of an electrically conductive material for electrical connection with a device on which the battery pack is mounted. Therefore, in order to prevent a short circuit between the electrode lead and the battery case, An insulating tape may be added between the first electrode lead and the second electrode lead. In this case, the insulating tape may be formed to have a size corresponding to the first electrode lead and the second electrode lead.

One end of the battery cell may be a positive terminal, and the other end of the battery cell may be a negative terminal. Specifically, the battery case may include a metal can having an opened top and a cap assembly mounted on the top of the metal can. The positive electrode of the electrode assembly may be electrically connected to the cap assembly to form a positive terminal at one end of the battery cell, which is the upper end of the cap assembly. The negative electrode of the electrode assembly is electrically connected to the metal can, The negative terminal can be formed at the other end of the battery cell, which is the lower end surface of the metal can.

As a specific example of the first electrode lead,

A first contact portion contacting one end of the battery cell for electrical connection;

A first clamping part mounted on an outer surface of the battery case, the first clamping part connecting the first contact part and the first wire; And

A first wire having one end fixed to the first clamping part and extending in the direction of the other end along the outer surface of the battery cell;

As shown in FIG.

As a specific example of the second electrode lead,

A second contact portion contacting the other end of the battery cell for electrical connection;

A second clamping unit mounted on an outer surface of the battery case, the second clamping unit connecting the second contact unit and the second wire; And

A second wire having one end fixed to the second clamping part and extending in the direction of the other end along the outer surface of the battery cell;

As shown in FIG.

The first wire and the second wire may be covered with an insulating material except for both ends. Specifically, both end portions of the first wire and the second wire may be portions that are electrically connected to a device to which the battery pack is mounted, and portions of the first wire and the second wire excluding the both end portions may be connected to the battery case And may be covered with an insulating material for insulation.

In addition, an insulating tape may be attached between the first clamping portion and the second clamping portion and the outer surface of the battery case. The clamping part may be made of an electrically conductive metal material for electrically connecting the wire and the contact part so that the clamping part is held between the clamping part and the outer surface of the battery case so as to maintain the electrical insulation state with the battery case. An insulating tape may be attached.

The first contact portion and the second contact portion may be respectively connected to one end and the other end of the battery cell by a welding method.

Specifically, the first contact portion may be connected to one end of the battery cell by laser welding. More specifically, the first contact portion may be in contact with a positive terminal formed on the upper surface of the battery case. The positive terminal may be formed on the upper surface of the cap assembly and the upper surface of the cap assembly may have a relatively narrow area so that by laser welding suitable for precise work of a narrow area, And may be connected to one end.

On the other hand, the second contact portion may be connected to the other end of the battery cell by spot welding. More specifically, the second contact portion may be in contact with an anode terminal formed on a lower end surface of the battery case. The cathode terminal may be formed on the lower end surface of the metal can, and the lower end surface of the metal can has a relatively large area. However, since the electrode assembly embedded in the metal can is closely contacted with the lower end surface, The electrode assembly inside the battery case may be damaged. Accordingly, the second contact portion may be connected to the other end of the battery cell by spot welding suitable for work on a wide, thin surface.

The contact portions are not limited to the welding method as long as the contact portions can be electrically and stably connected to the battery cell as well as the laser welding or spot welding. For example, arc welding, brazing welding, gas welding, Welding or the like.

The first cover tape may have a structure that covers one end of the first crimping portion and the first wire. One end of the first clamping part and the first wire may be made of an electrically conductive material and the exposed part of the first clamping part and the first wire may be electrically connected to the electric circuit So that the first clamping part and the first wire are covered with the first cover tape.

The first cover tape may have a structure covering one end portion of the battery cell and the first contact portion. The first cover tape may have a structure for covering one end portion of the battery cell and the first contact portion to prevent a short circuit between an electric circuit inside the device and one end portion of the battery cell and the first contact portion. The first cover tape may be attached to one end of the battery cell in an exposed state in order to directly contact and electrically contact one end of the battery cell with the device.

The second cover tape may have a structure covering one end of the second crimping portion and the second wire. One end of the second clamping part and the second wire may be made of an electrically conductive material and the exposed part of the second clamping part and the second wire may be electrically connected to the electric circuit The second cover tape may have a structure in which one end portion of the second clamping portion and the second wire are covered by the second cover tape.

The second cover tape may have a structure covering one end portion of the battery cell and the second contact portion. The second cover tape may have a structure for covering one end portion of the battery cell and the second contact portion to prevent a short circuit between one end of the battery cell and the second contact portion, The second cover tape may be attached in a state in which one end of the battery cell is exposed in order to directly contact and electrically contact one end of the battery cell with the device.

The contact portions and the wires may be made of a conductive metal material so that the battery cell and the device can be electrically connected.

For example, the first contact portion and the second contact portion may be made of a nickel (Ni) -based metal. For example, the first contact portion and the second contact portion may be nickel-copper alloy, nickel-chromium alloy, nickel- And the like. Alternatively, it may be made of a copper (Gu) -based or aluminum (Al) -based metal or an alloy-based metal thereof, and may be formed by plating a nickel (Fe) .

For example, the first wire and the second wire may be made of a copper (Gu) -based or aluminum (Al) -based metal, but the present invention is not limited thereto. For example, nickel brass, manganese brass, phosphor bronze, Delta metal, and naked brass, and may be made of an aluminum alloy.

The first electrode lead may be a positive electrode lead, and the second electrode lead may be a negative electrode lead.

The battery cell may be a lithium secondary battery. Specifically, the lithium secondary battery may be a lithium ion battery or a lithium ion polymer battery.

The present invention also provides a device including the battery pack as a power source.

The device may be selected from a cell phone, a smart band, a smart watch, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook, a wearable electronic device, a notebook computer, .

The structure of these devices and their fabrication methods are well known in the art, and a detailed description thereof will be omitted herein.

The present invention also provides a method of manufacturing the battery pack,

(a) fabricating a battery cell by incorporating an electrode assembly having a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode in a battery case together with an electrolyte solution;

(b) connecting a first electrode lead to one end of the battery cell and connecting a second electrode lead to the other end of the battery cell; And

(c) covering, at an outer surface of the battery cell, at least a portion of the first electrode lead with the first cover tape and covering at least a part of the second electrode lead with the second cover tape;

And a battery pack.

Specifically, in step (a), a step of wrapping the battery case with an insulating label may be further performed.

In the step (b), the first contact portion of the first electrode lead may be connected to one end of the battery cell by laser welding, and the second contact portion of the second electrode lead may be welded to the other end of the battery cell by spot welding Lt; / RTI >

As described above, the battery pack according to the present invention includes the electrode leads extending along the outer surface of the battery cell, so that even if the space inside the device in which the battery pack is mounted is small, And it is possible to mount the battery pack by adjusting the length of only the electrode leads to devices of various specifications.

Also, it is possible to provide an environment in which the internal space design of the device in which the battery pack according to the present invention is embedded can be flexibly designed according to portability and various designs.

1 is a perspective view of a battery pack according to an embodiment of the present invention;
2 is an exploded view of the battery pack of Fig. 1;
3 is a schematic view of a battery pack manufacturing process in a battery pack manufacturing method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 1 is a perspective view schematically showing another battery pack according to one embodiment of the present invention, and FIG. 2 schematically shows an exploded view of the battery pack of FIG.

1 and 2, the battery pack 100 includes a battery cell 101, a first electrode lead 110, a second electrode lead 120, a first cover tape 130, and a second cover tape 140 ).

The battery cell 101 includes a jelly-roll type electrode assembly (not shown) formed by winding a separator interposed between an anode and a cathode in a sheet form and a cathode and an anode, and a battery case 102 together with an electrolyte .

The battery case 102 is made of a cylindrical metal can, and the outer surface of the battery case 102 is surrounded by an insulating label 103.

The first electrode lead 110 is connected to the left end of the battery cell 101 and extends along the outer surface of the battery cell 101 in a state bent toward the right end of the battery cell 101.

The second electrode lead 120 is connected to the right end of the battery cell 101 and extends along the outer surface of the battery cell 101 in a state bent in the left end direction of the battery cell 101.

The first electrode lead 110 and the second electrode lead 120 can be adjusted in length and extension direction so that the battery pack 101 is electrically connected to the device while the battery pack 101 is mounted on the device The battery pack 101 can be easily connected to the device even if it is mounted inside the device of various specifications.

The first cover tape 130 has a structure that covers a part of the first electrode lead 110 on the side surface of the battery cell 101.

The second cover tape 140 has a structure that covers a part of the second electrode lead 120 on the side surface of the battery cell 101.

The first cover tape 130 and the second cover tape 140 wrap a part of the first electrode lead 110 and the second electrode lead 120 so that the first electrode lead 110 and the second electrode lead 120 120 from the device, except for the area where the device is electrically connected.

An insulating tape 150 is attached between the outer surface of the battery cell 101 and the first electrode lead 110 and the second electrode lead 120.

The left end of the battery cell 101 is made of a positive electrode terminal, and the right end of the battery cell 101 is made of a negative electrode terminal.

Specifically, the first electrode lead 110 includes a first contact portion 111, a first clamping portion 112, and a first wire 113.

The first contact portion 111 is in contact with the left end of the battery cell 101 for electrical connection between the battery pack 100 and the device and the first clamping portion 112 is mounted on the outer surface of the battery case 102 And connects the first contact portion 111 and the first wire 113.

The first wire 113 has a left end fixed to the first clamping part 112 and extends in the right end direction along the outer surface of the battery cell 101.

The second electrode lead 120 includes a second contact portion 121, a second clamping portion 122, and a second wire 123.

The first contact portion 121 is in contact with the right end of the battery cell 101 for electrical connection between the battery pack 100 and the device and the second clamping portion 122 is mounted on the outer surface of the battery case 102 And connects the second contact portion 121 and the second wire 123 together.

The second wire 123 is fixed to the first clamping portion 122 at the right end and extends in the left end direction along the outer surface of the battery cell 101.

The first wire 113 and the second wire 123 are covered with an insulating material except for both end portions connected to the device and the battery cell 102.

The insulating tape 150 attached between the outer surface of the battery cell 101 and the first electrode lead 110 and the second electrode lead 120 is specifically formed by the first clamping portion 122 and the second clamping portion 122 and the outer surface of the battery cell 101, respectively.

The first contact portion 111 is connected to the left end of the battery cell 101 by laser welding and the second contact portion 121 is connected to the right end of the battery cell 101 by spot welding.

The first cover tape 130 is configured to cover the first clamping part 112 and the left end of the first wire 113 and the second cover tape 140 is configured to cover the second clamping part 122 and the second And covers the right end of the wire 123.

The first cover tape 130 and the second cover tape 140 are configured to cover the first contact portion 111 and the second contact portion 121 to insulate both ends of the battery cell 101 from the device It is possible.

The first contact portion 111 and the second contact portion 121 are made of a nickel-based metal, and the first wire 113 and the second wire 123 are made of a copper-based or aluminum-based metal.

The first electrode lead 110 is made of a positive electrode lead, and the second electrode lead 120 is made of a negative electrode lead.

3 is a schematic view illustrating a process of manufacturing a battery pack in a battery pack manufacturing method according to an embodiment of the present invention.

Referring to FIG. 3 together with FIGS. 1 and 2, in the process (a), an electrode assembly having a cathode, a cathode, and a separator interposed between the anode and the cathode is built in the battery case together with the electrolyte solution, .

In step (b), the insulating label 103 is attached to the side surface of the battery cell 102.

In the processes (c) and (d), the first electrode lead 110 is attached to the left end of the battery cell 102 by laser welding, and the second electrode lead 120 is attached to the right end of the battery cell 102 It is attached by spot welding.

In step (e), the insulating tape 150 is attached between the first clamping part 112 and the second clamping part 122 and the battery cell 102, respectively.

In the step (f), the left end of the first clamping part 112 and the first wire 113 is covered with the first cover tape 130, and the right side of the second clamping part 122 and the second wire 123 And the end portion is covered with the second cover tape 140.

In the step (g), the function test and the specification test such as the impedance and the open-circuit voltage of the battery pack 100 are performed.

In the step (h), the protective cover 160 is attached to the ends of the first wire 111 and the second wire 121 to prevent the battery pack 100 from being short-circuited in contact with other conductive media before the battery pack 100 is mounted on the device. do.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (26)

A battery cell in which an electrode assembly having a positive electrode, a negative electrode, and a separator interposed between an anode and a cathode is embedded in a battery case together with an electrolyte;
A first electrode lead connected to one end of the battery cell and extending along the outer surface of the battery cell in a bent state toward the other end of the battery cell;
A second electrode lead connected to the other end of the battery cell and extending along an outer surface of the battery cell in a bent state toward one end of the battery cell;
A first cover tape having a structure that at least part of a first electrode lead is wrapped on a side surface of the battery cell; And
A second cover tape having a structure that at least part of the second electrode lead is wrapped around the side surface of the battery cell;
And the battery pack (10). The battery pack according to claim 1, wherein the electrode assembly is a jelly-roll type electrode assembly formed by winding a separator interposed between a cathode and a cathode in sheet form and a cathode and a cathode. The battery pack according to claim 1, wherein the battery case is a cylindrical metal can. The battery pack according to claim 1, wherein an outer surface of the battery case is surrounded by an insulating label. The battery pack according to claim 1, wherein an insulating tape is provided between the outer surface of the battery case and the first electrode lead and the second electrode lead. The battery pack according to claim 1, wherein one end of the battery cell is a positive terminal, and the other end of the battery cell is a negative terminal. The electrode assembly according to claim 1,
A first contact portion contacting one end of the battery cell for electrical connection;
A first clamping part mounted on an outer surface of the battery case, the first clamping part connecting the first contact part and the first wire; And
A first wire having one end fixed to the first clamping part and extending in the direction of the other end along the outer surface of the battery cell;
And the battery pack (10). The electrode assembly according to claim 1,
A second contact portion contacting the other end of the battery cell for electrical connection;
A second clamping unit mounted on an outer surface of the battery case, the second clamping unit connecting the second contact unit and the second wire; And
A second wire having one end fixed to the second clamping part and extending in the direction of the other end along the outer surface of the battery cell;
And the battery pack (10). The battery pack according to claim 7 or 8, wherein the first wire and the second wire are covered with an insulating material except for both ends. The battery pack according to claim 7 or 8, wherein an insulating tape is attached between the first clamping part and the second clamping part and the outer surface of the battery case. The battery pack according to claim 7 or 8, wherein the first contact portion and the second contact portion are connected to one end and the other end of the battery cell by a welding method, respectively. The battery pack according to claim 11, wherein the first contact portion is connected to one end of the battery cell by laser welding. 12. The battery pack according to claim 11, wherein the second contact portion is connected to the other end of the battery cell by spot welding. The battery pack according to claim 7, wherein the first cover tape covers one end of the first crimping portion and the first wire. 15. The battery pack according to claim 14, wherein the first cover tape covers one end portion of the battery cell and the first contact portion. The battery pack according to claim 8, wherein the second cover tape covers one end of the second crimping portion and the second wire. 17. The battery pack according to claim 16, wherein the second cover tape covers the other end portion of the battery cell and the second contact portion. The battery pack according to claim 7 or 8, wherein the contact portions and the wires are made of a conductive metal material. The battery pack according to claim 18, wherein the first contact portion and the second contact portion are made of a nickel (Ni) -based metal. 19. The battery pack according to claim 18, wherein the first wire and the second wire are copper (Gu) -based or aluminum (Al) -based metal. The battery pack according to claim 1, wherein the first electrode lead is a positive electrode lead and the second electrode lead is a negative electrode lead. The battery pack according to claim 1, wherein the battery cell is a lithium secondary battery. A device as claimed in claim 22 comprising a battery pack as a power source. A method of manufacturing a battery pack according to claim 1,
(a) fabricating a battery cell by incorporating an electrode assembly having a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode in a battery case together with an electrolyte solution;
(b) connecting a first electrode lead to one end of the battery cell and connecting a second electrode lead to the other end of the battery cell; And
(c) covering, at an outer surface of the battery cell, at least a portion of the first electrode lead with the first cover tape and covering at least a part of the second electrode lead with the second cover tape;
Wherein the battery pack has a plurality of battery cells. The method of manufacturing a battery pack according to claim 24, wherein in the step (a), a step of wrapping the battery case with an insulating label is further performed. The method according to claim 24, wherein in the step (b), the first contact portion of the first electrode lead is connected to one end of the battery cell by laser welding, and the second contact portion of the second electrode lead is welded to the battery cell Is connected to the other end of the battery pack.

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