Technology
This application claims the benefit of priority based on the 15th Korea Patent Application No. 10-2017-0118855 it in September 2017, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
The present invention relates to a method for producing electrode leads.
[Background Art]
Recently, the prices of energy resources due to the depletion of fossil fuels, are amplified interest in environmental pollution, the demand for eco-friendly alternative sources of energy has become an indispensable factor for the future life. In nuclear power, solar power, and is continuing research for a variety of power generation technologies, such as wind power, tidal power, the power storage device to use the thus producing energy in a more efficient and also it leads a great interest.

In particular, the demand for batteries as an energy source has rapidly increased with the development of technology and demand for mobile devices increases, many studies have been made on batteries that can meet a variety of needs accordingly.

Typically, the shaped surface of the battery is high, the demand for prismatic secondary batteries or pouch type secondary battery which can be applied to products such as a mobile phone, a small thickness, the material surface in with the advantages of high energy density, discharge voltage, output stability the high demand for lithium secondary batteries such as lithium ion battery, Lyrium ion polymer battery.

Further, the secondary battery has a positive electrode, a negative electrode, and a bar, typically to be classified, depending on whether the membrane is made up of any structure, the electrode assembly of the stacked structure which is interposed between the positive electrode and the negative electrode is, of the long sheet-like positive and negative electrodes of the structure winding in a separator is interposed state jelly-reulhyeong (wound type) electrode assembly, a stacked sequentially stacking a plurality of positive and negative one cut out in units of a predetermined size in a state of sandwiching the membrane-type (stack-type) electrode assembly and the like, in recent years, the jelly-to address reulhyeong electrode assembly and a stacked-type electrode problem assembly having the jelly-as an electrode assembly of a step forward structure of heunhap form of reulhyeong and stackable, of a predetermined unit scan of the structure in which the take-up sequentially in a state in which the position of a unit cell stacking the positive electrode and the negative electrode in a state of sandwiching the membrane on the separation film A / folding type electrode assembly has been developed.

Further, secondary batteries according to the shape of the battery case, the electrode assembly is a cylindrical battery and a prismatic battery that is embedded in a metallic can of cylindrical shape or square shape, the electrode assembly is an aluminum laminate sheet pouch case pouch-shaped battery that is embedded in the type of It is classified.

In particular, the pouch type secondary battery has a number of advantages are serialized quality multi-layer film a cylindrical secondary battery using a metal case to the product using a secondary battery or a prismatic outer casing do not have.

Representative examples of these advantages, there may be mentioned a low production cost, light weight, and that excessive pressure accumulation prior to being released to secure the stability and having excellent heat dissipation performance to come.

Figure 1 shows an exploded perspective view showing a general structure of a conventional representative pouch-shaped battery cell schematically shown in Fig.

1, the pouch-shaped battery cell 100, an electrode which is welded to the electrode assembly 130, the electrode assembly extend from the electrode taps 131 and 132 with 130, the electrode raepdeul 131,132 It is configured to include a battery case 120 for receiving the leads 141 and 142, and the electrode assembly 130.

The electrode assembly 130 is made up of a battery element is a positive electrode and the negative electrode are sequentially stacked on a separator is interposed state, stacking or stacking / folding type structure. Electrode taps 131 and 132 extend from each electrode plate of the electrode assembly 130, the electrode leads 141 and 142 may, for example, a plurality of electrode tabs (131, 132) extending from each plate, and each electrically connected to one another by a welding, and is partially exposed to the outside of the battery case (120). Further, the insulating film 150 is attached to the upper surface / if some cases also improve the sealing between the battery case 120 at the same time in order to ensure the electrical insulation of the electrode lead (141, 142).

However, the bent binary portion of the battery case 120 is narrow because of the space is formed in a state bent rear end of the electrode lead 141, electrode lead 140, the there is a problem that is easily broken by an external cheunggyeok or vibration . By laminating a plurality of thin plates constituting the electrode lead to the top, it is possible to improve the bending phenomenon of the electrode leads due to the elastic force of the thin metal plate, and thus the problem that the electrode lead is broken by an external cheunggyeok and vibration It can be solved.

Referring to Figure 2, there is a step for preparing a plurality of thin metal plates are laminated electrode lead according to the prior art shown. First, a plurality of film pieces in the metal lead 160, the take-off from the supply reel (180) (170, 171, 172, 173, 174) for attachment, and a plurality of film pieces (170, 171, 172, 173, 174 ) so that they can be stacked, and bending the metal lead 160. Then, the metal leads 160 to cut the bent region to produce an electrode lead.

In the manufacture of lead electrodes in this manner, since the thickness of the electrode lead is very thin, not easy to cut away a portion of the leads are bent, there is a problem of increasing the manufacturing time and cost.

Thus, there is a need for technologies that can fundamentally solve these problems.

[Detailed Description of the Invention]

[SUMMARY]

An object of the present invention is to solve the technical problem, which has been requested from the problems, and of the prior art.

The inventors of the present application are to the end of extensive research and various experiments in depth, as will be described later, in the method for producing the electrode lead, to be a plurality of lead pieces are jeokchung the plurality of lead pieces are bent to the sealed lid film , confirmed that can by sealing the bent lead film to the overlapping with the plurality of lead pieces producing the electrode lead, the sealing force is not only to implement a high electrode leads, increase productivity and simplify the manufacturing process and it completed the present invention.

Gasul ever - Solution -

Electrode lead production process according to the present invention for achieving these objects, the plurality of leads in between the first lead film and the second to the lengthwise direction of the lead film comprising a lead film first lead film and the shop second lead film to arrange the pieces

step; The plurality of lead pieces are stacked in a reference plane in the height direction of the reed pieces of the reed by bending the film laminate to the lead film. Forming; And a step of sealing the bent lead film which overlaps with the plurality of lead pieces.

A plurality of bent portions to the lead film can be formed.

1 to the lead film and the second lead to the film may be formed of the same size and material to each other.

The plurality of lead pieces are of a length of the long rectangular plate member against each width, may be formed such that the lead pieces longitudinally in a direction perpendicular to the longitudinal direction of the lead film.

By bending the lead film a "Z" shape to form the lead piece laminate.

After the formed body wherein the lead pieces may be laminated to the sealing film, the bent lead.

Before forming the lead pieces laminated body, it may further comprise the step of sealing the film to the bent leads after bending the leads of at least one film.

The sealing may be made by thermal fusion.

The step of sealing the first film and the second lead lead film prior to bending of the lead film may further include.

In the step of sealing the first film and the second lead lead film, it may be the lead film and the convenience aspect of the lead contact.

Wherein the heat-sealed also to the step of the first lead and a film sealing the second lead film may be lower than that of the heat-sealing step of sealing the said bent lead film.

Wherein the thermal fusion of the step of sealing the film and the first lead and the second lead film also may be a 30% to 60% the size of the heat-sealing of the step of sealing the film also the bent lead.

It is possible to form a plurality of the lead pieces laminate to the lead film.

The step of the cutout of the plurality of lead pieces layered product may further include. Sal cell including an electrode lead according to the above method is that the electrode assembly includes an electrode map projecting outer peripheral direction, at least one side; A battery case containing the electrode assembly is in a mounted in the storage state, the outer peripheral portion of the sealing structure sealed by thermal fusion; And while it is connected to the electrode wraps of the electrode assembly, the seal portion through to an electrode lead, which is projected outward direction of the battery case, the electrode lead has a plurality of lead pieces are in the height direction relative to the plane includes a lead piece laminate stacked, and the bent lead film so as to overlap with the plurality of lead pieces may be a structure that is sealed.

The lead films it may be a film comprising a first lead and a second lead film and the first lead or the second lead film film located on the top or bottom of the lead piece laminate.

The first lead film between the plurality of lead pieces with the first position to the second lead can be loaded alternately.

The thickness of the lead pieces stacked body does not exceed 0.2mm.

Thickness of the lead pieces may be 0.01mm to 0.04mm.

[Brief description of drawings]

1 is a perspective view showing a general structure of a conventional pouch-shaped battery leakage. Figure 2 is a schematic diagram showing a conventional electrode lead production process.

Figure 3 is a schematic view showing that the plurality of lead pieces are arranged between in accordance with an embodiment of the present invention, the first lead film and the second lead to the film.

Figure 4 is a plan view of the nested structure to lead the film 1, the lead piece and the second lead films in Figure 3.

Figure 5 is a vertical cross-sectional view taken along a chain line A in Fig.

Figure 6 is a vertical cross-sectional view of the lead pieces laminate to the lamination side of the lid Fig. 7 is a vertical section view showing the sealed state of the stacked body lead pieces 5.

Figure 8 is a vertical cross-sectional view of the electrode lead made in accordance with the embodiment described in Figs. 3 to 7.

Figure 9 is a schematic view showing that a plurality of lead pieces stacked body is formed on one of the lead film.

10 is a cross-sectional view showing the electrode lead made of the electrode lead and the other methods described in FIG.

[Mode for Carrying out the invention]

Or less, and more detail the present invention with reference to the drawings according to an embodiment of the present invention but is not the scope of the present invention is not limited by it.

Figure 3 is a schematic view showing that the plurality of lead pieces between the embodiment according to yesse first lead film and the second lead film of the present invention are arranged.

3, the lead film 210 to one lead film 211 and the second to include the lead film 212, and lead pieces (200, 201, 202, 203, 204) has a first lead film It is arranged between the 211 and the second lead to the film 212. The lead pieces of (200, 201, 202, 203, 204) each of width over a length of a long rectangular plate member, a width direction of the lead film 210 is perpendicular to the longitudinal direction of the lead film 210, part of each lead are arranged such that the longitudinal direction of the (200, 201, 202, 203, 204). Lead pieces in the shape and size of the (200, 201, 201, 203, 204) is not specifically limited, but the inner space of the cell case, connection between the electrode taps relationship, and an electrode exposure from the battery case of the lead to the outside, etc. to be considered to be selected.

Since it in the sealing process by heat-sealing to be described first lead film 211 and the second lead film 212, the size of the first lead film 211 and the second lead film 212 to increase the sealing force between the material may be equal to each other.

4 is a plan view showing a film of the first lead, second lead-based and lead pieces superposed film structure in FIG.

Figures 3 and 4, the lead film 210, and the bent portions are formed (220, 221, 222, 223), the lead film 210 along the bent portions (220, 221, 222, 223) It is bent in the direction of the arrow. For example, it is bent relative to the first bent portion 220 between the series 1 lead pieces 200 and second lead pieces 201 adjacent to each other, I 12 to first lead overlapping the lead piece 201 film 211 is a part can be disposed so as to face the first lead film 211, part of which overlaps with the first lead piece 201.

Further, to the adjacent bent relative to the second bent portion 221 between the second lead piece 201 and the third lead piece 202, a second lead to the third overlaps with the lead piece 202

Film 212 may be part of the shop's overlapping the second lead piece 201 is disposed so as to face the second lead film 212 portion.

Further, is it adjacent bent relative to the third bent portion 222 between the third lead piece 202 and the fourth lead piece 203, and the fourth to first lead film overlapping the lead piece 203 ( 211) can be arranged facing to a part of the first lead film 211, part of which overlaps with three lead pieces 202.

Also, the fourth lead pieces 203 and to 5 lead piece 204 is something between the bending, based on the fourth bending portion 223, a series of five overlapping the lead piece 204, second lead films adjacent to each other ( 212), the fourth part , can be disposed so as to face the second lead to film 212 portion that overlaps with the lead piece 201. the

Figure 5 is a vertical cross-sectional view taken along a chain line A in Fig.

Figure 4 and if the Fig. 5, the width direction side of the lead piece (200, 201, 202, 203, 204) to be covered by the first lead film 211 gwage second lead film 212. Widthwise side of the reed piece (200, 201, 202, 203, 204) 's may be in contact with the first lead film 211 and to second lead film 212, can be a sealing process performed for such a contact have. In this case, a first lead to film 211 and the second lead film 212 located between the lead pieces adjacent each other to be seal. Unlike shown in a modified embodiment, Figure 6, the first lead film 211 and the second lead film 212 located between the lead pieces adjacent to each other by a sealing process, even if the sealing together of the lid pieces (200 , 201, 202, 203, 204) in the width direction of the side may be formed in a portion spaced from and not in contact to one lead film 211 and the second lead film 212.

Figure 6 is a vertical cross-sectional view of the lead pieces laminate to the lamination side of the lid Fig. Figure 4 and reference to Figure 6, the lead piece laminated body 300 of the reed piece by bending the lead film 210 (200, 201, 202, 203, 204) relative to the plane of the lead film 210, as are stacked in the height direction. In particular, the lead film 210 is bent in a "Z" shape along the bending portions (220, 221, 222, 223). In the form of bending of the lead film 210 is lead pieces layered product ( 300 may be selected in a wide range in view of the thickness and length).

Of lead pieces of (200, 201, 201, 203, 204) after all of the stacked, lead pieces and the bent lead film 210, sealing ring (6 overlapping with (200, 201, 201, 203, 204) see arrow). For ease of illustration, the sealing of the lead film 210, mentioned earlier, are illustrated as being carried out only in the upper, this sealing can be carried out in both the upper or lower part, and upper / lower.

7 is a vertical section view showing the sealed state of the stacked body lead pieces 5.

Even when 5 and 7, in the sealed lead-piece laminated body 300 has a curved lead film 210, which overlaps with the lead pieces (200, 201, 202, 203, 204) is sealed. Cut out the sealed lead pieces stacked body 300 in the lead film 210, to prepare the electrode lead. Thus, the electrode lead production method according to an embodiment of the present invention can expect a high productivity because it does not require a separate step to cut the lead pieces from lead pieces stacked body 300 to shorten the manufacturing process time of the electrode lead .

Figure 8 is a vertical cross-sectional view of the electrode lead made in accordance with the embodiment described in Figs. 3 to 7.

8, the electrode lead 400, the lead pieces (200, 201, 201, 203,

204) may include a laminate in the height direction relative to the flat lead piece laminated body, and the lead piece (200, 201, 202, 203, 204) and a lid film (210 bent so as to overlap) is sealed.

Lead film 210, a first lead film 211 and the second includes a lead film 212, to one lead film 211 is located on top of the electrode lead 400, second lead film 212 located at the lowermost end of the electrode lead (400). Unlike this embodiment, the lead film 211 by reversing the bending direction is located in the bottom of the electrode lead 400, it may be second lead film 212 is positioned on top of the electrode lead (400). First lead film 211 and the second lead to the film 212 should be alternately positioned between the lead pieces (200, 201, 202, 203, 204).

Here, the thickness of the reed piece laminate, to increase the sealing force of the electrode lead 400 and the battery case, it is preferably not more than 0.2mm. The thickness of the lead pieces (200, 201, 202, 203, 204) is preferably 0.01mm to 0.04 隱. If less than the thickness of the lead pieces (200, 201, 202, 203, 204) 0.01mm, the handling of the lead pieces (200, 201, 202, 203, 204) not only does not facilitate the manufacturing process, the electrode lead It can not be allocated in the cheungbun a strength of 400. Lead pieces in not possible to ensure a cheungbun elasticity of the (200, 201, 202, 203, 204), the reed piece (200, 201, 201, 203, 204) if the thickness is more than 0.04 醒 of the electrode lead ( 400) can not improve the bending phenomenon.

Further, it is possible to to ensure the strength and the elasticity of the required electrode lead 400, a variety of configurations, each having a thickness of the lead pieces (200, 201, 202, 203, 204). As one example, around the lead piece 202 is located at the center in the height direction of the reed piece enemy worm 300 may be configured toward the lead piece to reduce the thickness or increase in the upper and lower portions.

In FIG as the sealing process described in the five first sealing, and when referred to a sealing process described in FIG Rev. 2 seal, the first seal and second seal is but may be made in various ways, as an example, a heat seal by it is achieved. Further, the welded diagram of a second seal of the Figure 6 is relatively low compared to the thermal fusion of the first seal is also in Fig. To 2 Schilling bending steps of the first lead film 211 and the second of lead pieces between the lead film 212 (200, 201, 202, 203, 204) is attached to this position, the lead film 210, the lead pieces (200, 201, 202, 203, 204) may be made not departing road heat of fusion approximately in the position at. Alternatively, the first seal is the type 2 silring would lead pieces of (200, 201, 202, 203, 204) and the bent lead film 210, which overlaps the sealed sufficiently layer to reduce as much as possible the thickness of the electrode leads, so preferably relatively high heat-sealing is preferably carried out also in comparison. As an example, a heat seal is also of the second sealing may be formed from 30% to 60% size for even heat fusion of the first seal.

Figure 9 is a schematic view showing that a plurality of lead pieces stacked body is formed on one of the lead film.

9, the plurality of lead pieces multilayer body (300, 301, 302, 303, 304) on one of the lead film 210 ' is formed.

10 is a cross-sectional view showing the electrode lead made of the electrode lead and the other methods described in FIG.

4 and referring to Figure 10, it is possible to seal the one of the lead film 210 is bent every time the lead-side laminated to form the lead piece laminate. First, each

Adjacent to first lead piece 200 and the second lead piece 201 is first bent by the bent part 220, a second first lead film 211, part of which overlaps with the lead piece 201 between the the crab may be disposed so as to face the first lead film 211, part of which overlaps with the first lead piece 201 and the bent lead film 210, all sealed. And, is bent relative to the second bent portion 221 between the bran 12 lead piece 201 and the third lead pieces 202 adjacent to each other, a series of three overlapping the lead piece 202, second lead film ( 212) has a part to seal the second lead piece 201 to second lead film 212 disposed so as to face the portions, the bent lead film 210, which overlaps with. The rest, with the lead pieces 203 and 204 are also stacked in the same manner to form the lead piece laminate.

This, has the advantage of ensuring a more robust sealing force and reduce the volume of the height direction of the reed piece laminate.

Those of ordinary skill in the art that the present invention, it will be possible to carry out various modifications and ungyong the accompanying claims within the scope of the invention.

[Industrial Applicability]

As described above, the electrode lead production process according to the present invention, a plurality of lead pieces are sealed by bending the lead film a plurality of lead pieces are presented to the bent lead film which overlaps with the lead pieces plurality laminate by the sealing by manufacturing an electrode lead, the sealing force is not only to implement a high electrode lead, it is possible to simplify the manufacturing process to improve productivity.

Claims

The method comprising: arranging the plurality of lead pieces between the first lead-based film and the second film in the longitudinal direction of the lead including a lead film to film and the first lead and the second lead film;

Wherein the plurality of lead pieces are formed stacked in the height direction lead piece laminate, based on the plane of the film leads to a bending of the lead film; And an electrode lead production method including the step of sealing the bent lead film which overlaps with the plurality of lead pieces.

[Claim 2]

Crab according to claim 1, wherein

Electrode lead production method with a plurality of bent portions formed in the lead film. [Claim 3]

According to claim 1,

1 to the lead film and the second lead to the film production method for electrode leads are formed in the same size and material to each other.

[Claim 4]

I in the U, wherein

And the plurality of lead pieces are of a long rectangular plate member, respectively compared to Length width, method of producing the electrode lead such that the lead pieces in the direction of the longitudinal direction perpendicular to the longitudinal direction of the lead film.

[5.]

According to claim 1,

Electrode lead manufacturing method by bending the lead film a "Z" shape to form the lead piece laminate.

[6.]

6. The method of claim 5,

Electrode lead production method for sealing the said bending leads to the film after the body is formed of the lead pieces stacked.

[7.]

6. The method of claim 5,

Before forming the lead pieces laminated body, method of producing the electrode leads further comprises the step of sealing the film to the bent leads after bending the leads of at least one film.

[8.]

Crab according to claim 1, wherein

The sealing method for producing electrode leads are formed by a heat seal.

[9.]

In the crab 8,

Electrode lead production method further comprises the step of sealing the first film and the second lead lead film prior to bending of the lead film.

[10.]

10. The method of claim 9,

In the step of sealing the first film and the second lead lead film, electrode lead production method in which the lid film and the surface of the lead pieces in contact.

[Claim 111

10. The method of claim 9,

Wherein said first lead-based film and the second heat-sealing also the step of sealing the lead film is even lower than the heat fusion of the step of sealing the film, the bent lead electrode lead production.

[12.]

In the shop 11,

The method of claim 1 to the lead film and the heat-sealing step of sealing the second lead also to a film 30% to 60% the size of the electrode leads of the thermal fusion of the step of sealing the said bent lead film is also prepared.

[13.]

According to claim 1,

Electrode lead production method for forming the plurality of lead pieces laminate to the lead film.

[14.]

In bran U3 wherein

Electrode lead production method further comprising: the plurality of lead pieces cut out laminate.

[15.]

An electrode assembly that includes the electrode tabs protrude at least to one side and the outer circumferential direction;

A battery case containing the electrode assembly is in a mounted in the storage state, the outer peripheral portion of the sealing structure sealed by thermal fusion; And

While connected to the electrode tab of the electrode assembly, and an electrode lead that protrudes through the sealing portion outward direction of the battery case,

The electrode lead has a plurality of lead pieces that includes a lead piece laminated body stacked in the height direction relative to the plane, a battery that has a lead film folded so as to overlap with the plurality of lead pieces are seals leak.

[16.]

16. The method of claim 15,

The lid film comprises a first film and lead to the second lead comprises a film, and the first lead film, or the battery cells to the second lead film located on the top or bottom of the lead piece laminate.

[17.]

16. The method of claim 15,

Cells to leak to the first position to the lid film and the second film are alternately read among the plurality of lead pieces.

[18.]

16. The method of claim 15,

The thickness of the battery cell lid side laminate should not exceed 0.2.
[Claim 19]

16. The method of claim 15,

A cell thickness Sal the lead pieces is 0.01 to 0.04