1]This application claims the benefit of priority based on the date of 1 Korea Patent Application No. 10-2018-0012994 February 2018, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[2]The present invention is an electrode assembly, and as its relates to a process for the preparation, more specifically to improve the alignment diagram of a secondary battery and an electrode assembly that can implement a battery of high capacity, and reducing the defects in case of loss (loss) rate and a method for their preparation relate to.
[3]
BACKGROUND
[4]
This secondary battery has been developed, unlike primary cells, rechargeable, and due also to the small size and large capacity much potential research in recent years. The demand for secondary batteries as an energy source has increased dramatically as the development of technology and demand for mobile devices increases.
[5]
The secondary battery is composed of a built-in electrode assembly in a battery case (pouches, cans, etc.). The electrode assembly is mounted in the interior of the battery case is made possible to repeat charging and discharging as a laminate structure of cathode / separator / anode.
[6]
Figure 1a is a side view showing a process of making an electrode assembly in a stack and the folding (Stack & folding) process in the conventional electrode assembly.
[7]
Referring to Figure 1a, the stack and the folding type electrode assembly are secured to the positive electrode 1, separator 3, negative electrode (2) are laminated in this order a plurality of unit cells (4) of a sheet-like membrane (5) is formed, by folding the sheet-like membrane (5) in one direction (L) has a structure formed.
[8]
The conventional stack and the folding type electrode assembly formed of the structure as is has the relatively improved stability advantages as compared to other structures disadvantages also exist.
[9]
First, in the electrode assembly of a conventional stack-and-folding-type positive electrode 1, separator 3, negative electrode (2) laminated to the individual unit cells (4) formed by cutting the main unit, first after creating the unit cells (4 ) it is subjected to the step of folding the sheet-like attached to the membrane (5), so complex an electrode assembly manufacturing process.
[10]
In addition, first, the tolerance generated in the positive electrode 1, negative electrode 2, a separator 3, respectively in the process to make a unit cell 4 and accumulation, if the folding of these unit cells (4) In the next step, the folding and stacking since the process is developing a tolerance between the unit cell 4 to be accumulated again occurs in that, there may occur an overhang (overhang) issues a positive electrode (1) is that the alignment is disordered outside the cathode (2).
[11]
This overhang (A), with increasing the number of stacked unit cells (4) (that is, with increasing the number of folding) is likely larger. That is, in this step, when when increasing the stacking number of the electrodes constituting the unit cell (4) increasing the stacking number of the electrode but is reduced in folding the number could be reduced folding number, constituting the unit cell (4) folding there was a problem that the alignment is difficult.
[12]
And, Fig. 1b is a side view showing a stacked type of an electrode assembly produced by lamination and stacking (Lamination & stacking) step. As shown in Figure 1b, the lamination and stacking process, the positive electrode 1, separator 3, negative electrode 2, a separator arranged 3 by the outer dimensions of the unit cell to a separator (3) formed are laminated so there is, in this case occurred yeoksido the overhang. That is, the cumulative over the course of the unit cell the individual tolerances of the plurality of electrodes (1,2) and a plurality of separators (3), since the tolerance is also accumulated between the unit cells, an anode (1) is out of the cathode (2) the overhang was generated. In Figure 1b the positive electrode (1) has a cathode (2) of the overhang zone (A) is outside the region is shown.
[13]
In addition, in order to solve the above problems the Applicant has then placing the negative electrode between the two separators at a set interval, and placing the positive electrode on both sides in every other position of the negative electrode, the electrode assembly of stacked achieve the zigzag shape and their as a method for producing "05/10/2016 bar has a patent application (Patent Application No. 10-2016-0128583).
[14]
However, such a zigzag layered structure but the effect to reduce the overhang, if the location of the defects even if one electrode has a problem that the all-cell defect occurs.
[15]
Detailed Description of the Invention
SUMMARY
[16]
Accordingly, the present invention has a primary object to provide an electrode assembly and a method that can solve the problems as described above.
[17]
Problem solving means
[18]
The present invention for achieving the above object is, as a method of manufacturing the electrode assembly, the method comprising interposing one of the plurality of first electrodes arranged to be spaced apart from each other between the two sheets of membrane; Laminating a second electrode on the outer surface of the membrane on both sides, each of the first electrode, wherein in a plurality of positions of every other one for position 1, the electrodes are placed, the second electrode / separator / first electrode / separator / second 2 across the bi-cell and a half-cell stack as a separator / first electrode / separator laminate in order to form the electrodes in order continuously; A step of cutting the bi-cell and a unit cell are led said one half-cell; Further comprising: folding the unit cells such that cell and by the half-cell are stacked; Characterized in that it comprises a; and to the folded unit cell stacking a plurality of steps of manufacturing the electrode assembly.
[19]
In the process according to the invention as would have been cut to the unit cell stage is the first sealing is executed to bond in the rim portion of the unit cell, folding the first unit cell between the left stack separator between the first electrode before it is made of; the more It includes.
[20]
Then, the step in which the second sealing is executed after the folding of the said unit cell consisting of the adhesive where the rim portion abuts the rim portion and the bi-cell of the half-cell; may further comprise a.
[21]
At this time, the second point 2 seals are formed of overlapping at the point and at least a portion that was made of the first sealing.
[22]
The first sealing and the second sealing is performed by applying heat and pressure to be bonded to each other, the separation membrane.
[23]
And, when the unit cells are stacked, with each unit cell are connected to the bi-cell and a half-cell and is laminated portion of folding the folded portion to be placed toward the same direction.
[24]
In another embodiment of the present invention, when they stack the unit cell, n layer connected to the bi-cell and a half-cell in the unit cells placed in the (n is a natural number of 1 or more), and a folding portion folded part placed to face the one side ( folding of the unit cells placed in layer n + 1) unit can be made to be placed so as to face the other end of the other side.
[25]
In the present invention, the first electrode has an area equal to or greater than the second electrode, the first electrode is a cathode and the second electrode is the anode.
[26]
Accordingly, the present invention relates to a method of manufacturing the secondary battery includes a method of making an electrode assembly as above can be provided. That is, doedoe method of manufacturing a secondary battery according to the present invention comprises the steps of: a built-in step and the electrode assembly for making an electrode assembly into the case, the manufacturing method of the electrode assembly manufacturing method of an electrode assembly provided in the present invention this shall apply.
[27]
In addition, the present invention further provides an electrode assembly is made the anode, a separator, a positive electrode are sequentially stacked. The electrode assembly according to the present invention, cathode / separator / anode / separator / the bi-cell stack with a positive electrode in order; the half-cell stacked in the separator / anode / separator sequence; gatdoe the two are repeated alternately in a stacked structure, one side-by- cell is formed the other side of the half cell is formed is characterized in that the unit cell formed by stacking a plurality dog ​​folding the laminate such that the bi-cell and a half cells.
[28]
The electrode assembly according to the present invention, the half-cell and cell-by folding in each unit cell separator of the half-cells and bi-cell membrane so that movement of the block is bonded at least one at least one point. Then, the unit cells adjacent to each other are bonded in the membrane at least one point over each other disposed adjacent to each other.
[29]
Effects of the Invention
[30]
The electrode assembly of the present invention having the configuration as described above, because the configuration of the unit cell of a half cell and a bi-cell is led status can reduce the possibility of a conventional overhang occurs, the unit cells is made, the folding at one divided poor when the electrode assembly problems have to discard the entire occurrence can be eliminated (in more detail the problem of the structure described in Patent Application No. 10-2016-0128583).
[31]
In addition, in the present invention can be cells of the first sealing unit and / or the second sealing is made to block the movement of the electrode more effectively respond to the overhang.
[32]
Brief Description of the Drawings
[33]
Figure 1a is a side view of a process of manufacturing the electrode assembly of the stack and the folding process illustrated.
[34]
Figure 1b is a side view of the process for preparing an electrode assembly by laminating and stacking process shown.
[35]
Figure 2a is a side view of the figure is shown a cathode are disposed with a gap between two sheets of membrane in accordance with an embodiment of the invention.
[36]
Figure 2b is a side view of the state that the positive electrode on both sides of each of the negative electrode one by one interval based on the state of Figure 2a showing attachment.
[37]
Figure 2c is a side view of a positive electrode shown in Figure 2b attached.
[38]
Figure 3 is a side view of the appearance in shape and both ends of each of the unicast cell of a bi-cell and a unit cell resulted in a half-cell comprising a first sealing depicted.
[39]
Figure 4 is a side view of the appearance of the folding unit cells consisting shown.
[40]
Figure 5a shows a state stacked in this state is placed to the plurality of unit cells face the same direction as shown the figure.
[41]
Figure 5b shows a state stacked in this state is placed in the additional folding unit cell placed on the folded portion and the layer (n + 1) of the unit cells placed in the n-th layer (n is an odd number) to each other toward the other end of the drawing shown.
[42]
Figure 6a is a plan view as the folded state after it was before the unit cell is shown folded, view showing a primary sealing and secondary sealing point is formed.
[43]
Figure 6b is a view of the secondary seal the laminated unit cells are made of a view shown.
[44]
Mode for the Invention
[45]
A detailed description to be easily implemented by those of ordinary skill in the art with respect to the present invention on the basis of the following, that the appended drawings. However, the invention is not to be implemented in many different forms and limited to the embodiments set forth herein.
[46]
Parts not related to the description in order to clearly describe the present invention was omitted, so as to put the same reference numerals for the same or similar elements throughout the specification.
[47]
In addition, the specification and be construed to limited to the terms or words used in the claims general and dictionary meanings are should not, the inventors define as appropriate for the concept of a term to describe his own invention in the best way on the basis of the principle that can be interpreted based on the meanings and concepts corresponding to technical aspects of the present invention.
[48]
Provide the present invention relates to an electrode assembly produced by the manufacturing method and the manufacturing method of the electrode assembly for reducing the loss rate according to the resolved and defects the overhang, additionally a method of manufacturing a secondary battery which includes the above-mentioned production method do. With reference to the accompanying drawings an embodiment of the present invention will be described in more detail.
[49]
[50]
Example 1
[51]
[52]
Figure 2a with a one gap in the state of a side view of the appearance of the present embodiment the cathode (20) according to the example in between the two sheets of separators 30 of the invention is disposed with an interval shown, Figure 2b Figure 2a cathode ( and the state that the positive electrode 10 attached to both sides respectively show a side view of a 20), Figure 2c is a side view of an attached state that the positive electrode 10 shown in Figure 2b.
[53]
Referring to the drawings, the process according to the invention starts from the step of interposing a plurality of one first electrode disposed to be spaced apart from each other between the two sheets of separators (30).
[54]
In the invention of the first electrodes is an anode (10) may be, but the cathode 20 is preferable, and spacing between the cathode (20) adjacent the cathode (20) thickness, a separator between the 30 It can be determined depending on the thickness and the conditions required during the folding.
[55]
And, the second above the first electrode is placed a positive electrode (10) to the outer surface of the first of said membrane on both sides, each of the first electrode 30 at a plurality of positions played position across one of the steps shown in Figure 2b are attached to the electrodes are laminated.
[56]
Accordingly, the the half cells 102 stacked in a cathode / separator / anode / separator / the bi-cell stack as anode order 101 and separator / anode / separator sequence as shown in Figure 2c is formed in a row alternately .
[57]
Then, the cut is made in the bi-cell 101, one with the half cell 102 unit cells 100, one is led. In this case, it is the rod consists of a first sealing (primary sealing) in the border portion between the separation membrane 30, as shown in the cut because the unit cell 100 is flared between membrane 30 at both ends conditions as FIG.
[58]
The unit cell 100 (which will go through the center of the cathode) since the first sealing place while the vertical is achieved a symmetric relative to the virtual center line at a high temperature, high pressure conditions occur in the production process of the subsequent secondary battery It may be bending and / or deformation is suppressed.
[59]
After the first sealing consisting of the unit cell 100 is composed of a folded, as shown in Figure 4 so that the half cell 102 and the bi-cell 101 are laminated.
[60]
Doedoe the unit cell 100 in the folding are multiple pieces of laminate made of the electrode assembly, the as shown in Fig. 5a and 5b may be made to be laminated is supported by a separate folding separator 40 and each of the unit cell by adhering to the upper and lower surfaces of the (100) may be formed of a laminate without the need for separate folding membrane 40. the
[61]
In addition, the unit and the cells 100 may be stacked to lie toward the same direction connecting the bi-cell 101, and the half cell 102 and the addition of the folded portion of the folding, as shown in Figure 5a, or Fig. as shown in 5b, n layer may be laminated portion of the unit cell placed on the folded portion and the (n + 1) of the unit cell layer is placed in the (n is a natural number of 1 or more) folded so as to face each other in opposite directions. It would be more useful if the structure doegie sort would be optional according to the specifications latter to the height of the two sides meet.
[62]
In addition, the present invention is made as the first seal so as to prevent the movement of the membrane 30 and the electrode (cathode, anode) as described above. Then, the second sealing (secondary sealing) the unit cells 100 so that the folded state can be fixed may be made additionally. That is, is the primary seal between membrane 30 at each edge portion of (having a rectangular shape when viewed looking at the top and bottom), the unit cell 100 is performed, the folding is made before the folding is done as shown in 6a after the second sealing can be achieved. The secondary sealing is done where the edge portions and edge portions of the half cell 102 in the bi-cell 101 abuts as shown the secondary sealing is formed of points are points that were the primary sealing done with at least some It can be duplicated.
[63]
In this case, the separator 30 according to the present invention are prepared so when heat is applied to the polymer-containing material to the adhesive force generated, by applying heat and pressure can be carried out the first seal and the second seal.
[64]
Second sealing the unit cell 100 is made of a formed state can be achieved more stably stacked, so the movement of the both ends fixed as illustrated in Figure 6b.
[65]
For reference, in the present invention as described above, wherein the first electrode is the cathode 20 and the second electrode is the first electrode anode (10), provided preferably has an equal to or greater area than the second electrode.
[66]
On the other hand, the manufacturing method of the secondary battery incorporating the electrode assembly is formed by typically includes a "step of preparing an electrode assembly" and "the step of embedding the electrode assembly in the pouch (case). Accordingly, the present invention is therefore provided by the above method of producing such an electrode assembly, comprising: manufacturing an electrode assembly, of the method of manufacturing a secondary battery may be additionally provided a method of manufacturing the secondary battery. Method for manufacturing the secondary battery will avoid redundancy and method of manufacturing the electrode assembly described above, additional description is omitted.
[67]
[68]
Example 2
[69]
[70]
The present invention is a cathode 20, a separator 30, the anode 10 is subsequently deposited in further provides an electrode assembly is manufactured.
[71]
Doedoe electrode assembly according to the invention consisting of the dog multiple unit cells 100 stacked as shown in Fig. 5a, 5b, 6b, the unit cell 100 is resulted in a bi-cell 101, and the half cell 102 It has a folding structure in condition.
[72]
That is, as illustrated in Figure 3, the unit cell 100 of the present invention is bi-cell 101, one and a half cells 102, the bi-cell 101, one gatdoe a structure connected is of the half cell 102 a positive electrode (10) on both sides, each having a structure in which to be added to the stack. Accordingly, the bi-cell 101 has a stacked structure in a cathode / separator / anode / separator / anode order half-cell 102 has a stacked separator / anode / separator structure order. In addition, the unit cell 100 is 4 and as a half-cell 102 and doedoe folded such that the laminate of the bi-cell 101 is made, so as to prevent the electrode and the folding state moves the primary seal and a secondary seal is made can. Note that, although Figure 6a in the illustrated as being exemplary primary seal and the secondary seal only at the edge portion of the separator 30, the primary seal and the secondary seal may be carried out along the perimeter of the membrane 30 as a whole , it will be possible also by a heat sealing adhesive, as well as through the sealing pressure as described above.
[73]
[74]
The electrode assembly of the present invention having the configuration as described above, because the configuration of the half cell 102 and the bi-cell 101, the unit cell 100 in the resulted conditions it is possible to reduce the possibility of a conventional overhang occurs, each of the unit cells 100 can be achieved because the folding in the divided state, one should solve the problem when disposing of the entire electrode assembly defects.
[75]
In addition, in the present invention, it is possible to block the first seal and / or the electrode moves the second sealing is made up of the unit cell 100 more efficiently respond to the overhang.
[76]
The present invention in the above Although the detailed description and specific examples, the invention is not limited thereto, the substrate under the technical scope of the present invention by one of ordinary skill in the art It can be a variety of embodiments within the equivalent scope of the claims.

Claims

[Claim 1]In the production method of the electrode assembly, the method comprising interposing one of the plurality of first electrodes arranged to be spaced apart from each other between the two sheets of membrane; Laminating a second electrode on the outer surface of the membrane on both sides, each of the first electrode, wherein in a plurality of positions of every other one for position 1, the electrodes are placed, the second electrode / separator / first electrode / separator / second 2, the bi-cell and the membrane electrode laminated in the order / first step of the continuous form in one shift a half-cell stacked in the electrode / membrane sequence; A step of cutting the bi-cell and a unit cell are led said one half-cell; Further comprising: folding the unit cells such that cell and by the half-cell are stacked; The method of comprising the electrode assembly; and a folded unit cell by laminating a plurality of steps of manufacturing the electrode assembly.
[Claim 2]
According to claim 1, wherein when would have been cut to the unit cell stage is the first sealing is executed to bond in the rim portion of the unit cell, folding the first unit cell between the left stack separator between the first electrode before it is made of; the more the method of the electrode assembly characterized in that it comprises.
[Claim 3]
The method of claim 2, wherein that the second sealing is executed which after the folding of the said unit cell consisting of the edge portions and edge portions of the half cell in the bi-cell adhesion in the abutting place; of the electrode assembly according to claim 1, further including method.
[Claim 4]
The method of claim 3, wherein the point 2 seals formed manufacturing method of the electrode assembly, characterized in that the overlapping at the point and at least a portion that was made of the first sealing.
[Claim 5]
4. The method of claim 3, wherein the first sealing and the second sealing manufacturing method of an electrode assembly which comprises applying heat and pressure to be bonded to each other, the separation membrane.
[Claim 6]
Claim that the method according to any one of claims 1 to 5, that is when they stack the unit cells, each unit cell are connected to the bi-cells and half cell and the laminated portion of folding the folded portion to be placed toward the same direction, method for manufacturing an electrode assembly according to claim.
[Claim 7]
Any one of claims 1 to A method according to any one of claim 5, wherein when they stack the unit cell, n layer connected to the bi-cell and a half-cell in the unit cells placed in the (n is a natural number of 1 or more), and adding the folding the folded portion placed so as to face the one side (n + 1) method for manufacturing an electrode assembly, characterized in that the folding of the lying unit cells placed in the floor portion so as to face the other end of the other side.
[Claim 8]
The method according to any one of claims 1 to 5, wherein the first electrode of the electrode assembly, characterized in that having an equal to or greater area than the second electrode, the first electrode is a cathode and the second electrode is an anode method.
[Claim 9]
At the step, and the manufacturing method of a secondary battery comprising the step of embedding the electrode assembly in the case of manufacturing the electrode assembly, the method of manufacturing the electrode assembly, a plurality of first to be spaced from each other between the two sheets of separator step interposed one by one electrode; Laminating a second electrode on the outer surface of the membrane on both sides, each of the first electrode, wherein in a plurality of positions of every other one for position 1, the electrodes are placed, the second electrode / separator / first electrode / separator / second 2 across the bi-cell and a half-cell stack as a separator / first electrode / separator laminate in order to form the electrodes in order continuously; A step of cutting the bi-cell and a unit cell are led said one half-cell; Further comprising: folding the unit cells such that cell and by the half-cell are stacked; Method of producing a secondary battery comprising: a; and the folded unit cell and stacking a plurality of steps of manufacturing the electrode assembly.
[Claim 10]
An anode, a separator, a positive electrode is the electrode assembly to be produced are successively laminated in a positive electrode / separator / anode / separator / the bi-cell stack with a positive electrode in order; and separator / anode / separator order the half-cell stacked in; repeated alternately gatdoe is a laminated structure, one side of the bi-cell is formed in the other side half cell is formed, characterized in that the electrode assembly is formed of a plurality of unit cells stacked dog folded such that the laminate by the cell and the half-cell.
[Claim 11]
The method of claim 10, wherein each of the half-cell and a cell by folding the unit cells in the electrode assembly, characterized in that the motion is a separator of the half-cells and bi-cell membrane of that block is bonded at one or more points at least one
[Claim 12]
Claim 10 or claim 11, wherein the unit cells adjacent to each other are an electrode assembly, characterized in that the adhesive in the membrane at least one point over each other disposed adjacent to each other.