1]The present invention relates to an apparatus for forming a, more specifically, the dead space (dead space) for reducing the pouch type secondary battery having increased energy density and the pouch film to be used for it relates to a pouch type secondary battery.
[2]This application claims priority from Korea Application No. 10-2017-0117852, filed on September 14, 2017, and all the contents thereof are hereby incorporated into this application by reference.
[3]
BACKGROUND
[4]
Recently, itah growing interest in electronic products that can be driven by electrical energy. And accordingly the demand for secondary batteries as an energy source is increasing rapidly as the technology and the increasing demand for electrical products has been diversified forms of demand, too. Therefore, there is much research on rechargeable battery is going to be able to meet a variety of needs.
[5]
The secondary battery is classified as a pouch-shaped, cylindrical, prismatic such as the type of packaging material, of the pouch type secondary battery is a secondary battery with the electrode assembly is built into the pouch case of a metal laminate sheet. The pouch type secondary battery has an advantage in manufacturing is easy and manufacturing cost is low, was easy to configure a large-capacity battery pack by connecting a plurality of unit cells in series and / or in parallel.
[6]
For example, the pouch type secondary battery of a single cup-type, aluminum including a pouch case made of a laminate sheet, strong assembly of the electrochemical cell to be housed inside the pouch case comprising a positive electrode / separator / negative electrode is a multi-stacked.
[7]
1 is a schematic cross-sectional view of a conventional pouch type secondary battery, and FIG. 2 is a process chart showing a conventional pouch film-forming apparatus showing a forming step of forming a recess in the pouch film.
[8]
1, the pouch case is of a lower pouch film (1) and the upper film pouch (2). And there is a groove with the electrode assembly 3, the upper film pouch (2) can be seated is formed. The recess is that the forming (forming) in correspondence with the upper film pouch (2) with the shape of the electrode assembly 3, the depth of the groove is determined by the thickness of the electrode assembly (3).
[9]
Referring to Figure 2, the conventional pouch film forming apparatus includes a die (die, 4) and a punch (punch, 5). The die (4) has a forming groove (4a) of a shape corresponding to when forming the pouch case using a pouch film (2), the shape of the desired pouch case is formed. At this time, the depth of the forming groove (4a) has a depth corresponding to the depth of the groove to be formed to the desired pouch case. And the role that the punch (5) is subjected to force, place the pouch film (2) to the die (4) to form a pouch case having a groove of a desired depth by using a pouch film (2), that is, press-forming and the.
[10]
However, the die (4) of the forming groove (4a) having a diameter of the punch (5) does the groove because of the larger than the diameter of the pouch film (2) not forming completely match the forming groove (4a) of the die. That is, in the excited state to the side surface portion with a side wall of the forming groove of the forming groove (4a) and the punch (5), the pouch film (2) because of the physical properties of the size difference and somewhat flexible pouch film (2), in the forming step between is an angle forming. Thus, when the side surface of the pouch film to be obliquely forming, is reduced, the area of ​​the bottom surface of the groove. For example, as shown in FIG. 1, referred to the total width L1 of the groove plane, width of the bottom surface is decreased in area relative to the reference surface of the groove to L1-2 × (L2 + L3).
[11]
However, the size of the electrode assembly which can be accommodated in the pouch case is the area of ​​the bottom surface of the groove decreases since the relationship between the area of ​​the bottom surface of the groove is disadvantageous in terms of energy density. The recent high energy density becomes the research and development of a compact battery pack, lively, and many pointed out that priority should be improvement in energy density than existing rechargeable battery cell unit in order to implement this battery pack. Therefore, the methods that can increase energy density by reducing the dead space (dead space) is desired in the inner space of the conventional pouch-shaped secondary battery.
[12]
Detailed Description of the Invention
SUMMARY
[13]
The present invention been made in view of the prior art as described above, the pouch case the internal dead space (dead space) to reduce use pouches that can increase the energy density by accommodating an electrode assembly of the high-capacity secondary battery and its more traditional in the pouch is loaded there is provided an apparatus for foaming.
[14]
Problem solving means
[15]
According to an aspect of the invention there is provided a pouch type secondary battery consisting of the electrode assembly and a pouch case the electrode assembly is formed with a housing capable groove arranged positive and negative plates so as to face each other, the pouch case includes a first pouch film .; And wherein the first comprises a pouch film and heat-sealing the second pouch film, the first pouch film and a groove on at least one of the second pouch film is formed, said groove is possible seated to face the electrode assembly a pouch type secondary battery is equal to the area of ​​the reference surface to cover the open portion of the groove area or larger is formed on the bottom surface can be provided.
[16]
The recess is, the second according to the depth from the reference surface and the first side section the width of said groove gradually formed so narrow as at the end of the first side section is formed such that the width of the groove gradually wider as to the bottom surface It may include a side section.
[17]
The first side portion may take a rounded form.
[18]
Width of the electrode assembly may correspond to the entire width of the recess in the first side end section.
[19]
The electrode assembly is made of one or more battery cells is stacked structure of the one or more battery cells, each width may correspond to the width of the groove in the stacked position.
[20]
The first battery cell group from among the at least one battery cell, the first laminated on the side sections, each width of the first battery cell group in the battery cell may correspond to a width of the groove including the first side section.
[21]
The second battery cell group from among the at least one battery cell, the second laminated on the side sections, each battery cell of the full width of the second battery cell group may correspond to a full width of the recesses included in the second side section.
[22]
The pouch type secondary battery is an inner film that wraps around the outer circumference of the electrode assembly accommodated in the interior of the pouch case it may further include a.
[23]
The grooves may be formed in the first pouch film.
[24]
The first pouch and the second film is formed of a single sheet of film of the second pouch film, wherein the film pouch is a second fold about the first pouch film may form a pouch case of a single-cup type.
[25]
According to another aspect of the invention, there is provided a pouch film forming apparatus for forming a pouch case having the above-mentioned groove, the first die but form a forming groove of a shape corresponding to the recess provided so as to be movable relative to the horizontal direction die consisting of a die unit and a second unit; And a pouch film forming apparatus including a groove portion provided target punch able to be in close contact with the surface of the forming groove of the forming around the pouch film with a take-mouth possible and the air pressure in the forming groove may be provided.
[26]
The second die unit can be formed with a top surface on which the pouch rests film relatively wider than that of the first die unit.
[27]
The punch may be provided with a plurality of air ejection openings capable of ejecting the compressed air from the inside to the outside.
[28]
The punch may be formed with a soft material that can be contracted or expanded in accordance with the air injection.
[29]
Effects of the Invention
[30]
According to an aspect of the invention, the pouch type secondary battery which, by reducing the dead space (dead space) within the pouch case housing the electrode assembly of a high capacity to increase the energy density than conventional can be provided.
[31]
According to another aspect of the invention, the electrode assembly has a bottom surface that can be secured is a pouch film forming apparatus capable of forming a pouch film equal to the reference surface to cover at least the pouch film groove opening portion of, or having a larger groove be provided can.
[32]
Brief Description of the Drawings
[33]
Intended to illustrate the following figures attached to the specification are exemplary of the invention, the components which serve to further understand the spirit of the invention and together with the description of which will be described later invention, the details of this invention is described in such figures be construed as limited only is not.
[34]
Figure 1 is a conventional pouch-schematic cross-sectional view of a secondary battery.
[35]
Figure 2 is a process chart showing a conventional pouch film-forming apparatus showing a forming step of forming a recess in the pouch film.
[36]
Figure 3 is a perspective view schematically showing a pouch case according to an embodiment of the present invention.
[37]
4 is a cross-sectional view schematically showing a pouch case and the electrode assembly of FIG.
[38]
5 is a cross-sectional view schematically showing a state after sealing an electrode assembly accommodated in the pouch case of FIG.
[39]
6 is a schematic cross-sectional view of the pouch type secondary battery showing a state obtained by reversing the fold, and then the upper and lower parts of the sealing in the pouch type secondary battery of FIG.
[40]
Figure 7 is a perspective view of the electrode assembly of the pouch type secondary battery according to another embodiment of the present invention.
[41]
Figure 8 is a schematic cross-sectional view of a pouch type secondary battery according to another embodiment of the present invention.
[42]
Figure 9 is a perspective view of the electrode assembly of the pouch type secondary battery according to still another embodiment of the present invention.
[43]
10 is a schematic cross-sectional view of a pouch type secondary battery according to still another embodiment of the present invention.
[44]
11 to 14 are process drawings pouch film forming apparatus according to an embodiment of the present invention showing a forming step of forming a recess in the pouch film.
[45]
15 and 16 are the flow diagram the pouch film forming apparatus according to another embodiment of the present invention showing a forming step of forming a recess in the pouch film.
[46]
Mode for the Invention
[47]
With reference to the accompanying drawings will be described a preferred embodiment of the present invention; Prior to this, the specification and are not to be construed as limited to the term general and dictionary meanings used in the claims, the inventor accordingly the concept of a term to describe his own invention in the best way It interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that can be defined.
[48]
Thus in this embodiment the configuration shown in the examples and drawings disclosed in the specification is merely nothing but a preferable embodiment of the present invention, not intended to in the technical idea of ​​the present invention, a variety of equivalents that can be made thereto according to the present application point it should be understood that water and modifications could be.
[49]
Embodiment of the present invention because it can be of the shape and size of the elements in the drawings are exaggerated, omitted or schematically shown for a more clear description is provided to more completely explain the present invention by ordinary skill. Thus, the size and ratios of each component does not utterly reflect an actual size or scale.
[50]
Figure 3 is a perspective view showing schematically a pouch case according to an embodiment of the present invention, Figure 4 is a cross-sectional view schematically showing a pouch case and the electrode assembly of FIG.
[51]
Figures 3 and 4, the pouch type secondary battery according to an embodiment of the present invention includes an electrode assembly 10, the electrode assembly 10 has a first pouch film (30) having a housing capable groove 31 and includes a pouch case 20 is composed of a second pouch film (40) that can be heat-sealed to the first film, the pouch 30 and the top and bottom.
[52]
Although described later in detail, the pouch case 20 according to the present invention are identical to the conventional pouch case 20 and the width, the electrode assembly 10 is there is effectively an internal space that can be stored can be further secured. Thus, the same size compared to the pouch type secondary battery of the present invention, the energy density is higher can be stored for a larger electrode assembly 10 capacity than a conventional pouch type secondary battery. When using a pouch type secondary battery according to this invention, the design of the battery pack compact than the prior art can be made possible.
[53]
First, briefly described with respect to the electrode assembly 10 constituting the pouch type secondary battery of the present invention, the electrode assembly 10 although not shown for convenience of the drawing in detail, the positive electrode plate and negative electrode plate is structured in a configuration in opposite to each other can. The positive electrode plate and negative electrode plate are formed in the active material slurry is applied on the current collector structure, the slurry typically has a particulate active material, an auxiliary conductor, a binder and a plasticizer or the like can be formed and they were stirred in the solvent is added to the state.
[54]
The positive electrode plate and negative electrode plate is composed of a plate-shaped and arranged spaced-apart such that the shape viewing the plate surface facing each other. Between the positive electrode plate and negative electrode plate is interposed a separator (separator) to prevent the positive electrode plate and negative electrode plate being in contact with each other directly. This separator is blocked by the positive electrode plate and the negative electrode plate is provided with a porous structure, but they do not short-circuit to enable the movement of the charge upon charging or discharging.
[55]
The electrode leads attached to the electrode assembly 10 and the electrode leads are exposed to the outside the pouch case 20 may be an electrode terminal roles that can be electrically connected to the other secondary battery or an external device. These electrode lead may be coupled directly with the electrode tab connected to the electrode assembly 10. Here, the at least one positive electrode tab and negative electrode tab may be combined with each of the positive electrode lead 11 and the negative electrode lead 12.
[56]
A pouch case 20 may be provided with a metal layer interposed between the outer insulating layer of a polymer material and an inner adhesive layer, and the outer insulating layer and the inner adhesive layer. Wherein a material of the metal layer there are iron, carbon, chromium, alloys of manganese, iron, an alloy of chromium and nickel, aluminum, or any selected one of the like may be used, an aluminum metal foil is widely used. The pouch case 20 may protect the internal components such as the electrode assembly 10 and the electrolyte, and performs a heat dissipation function and the complement of the electrochemical properties of the electrode assembly 10 and electrolyte.
[57]
A pouch case 20 according to this embodiment is a pouch case 20 of the single-cup type, as shown in Figure 3, one edge consists of a first pouch film 30 and the second pouch film 40 connected to one another . And the first pouch film 30 has a groove 31 in which the electrode assembly 10 can be seated is provided. The groove of the first pouch film 30 31 can be formed to have a depth corresponding to the thickness of the electrode assembly 10 through the forming (forming) process.
[58]
In this embodiment the first pouch film 30, but only to form a groove 31, Alternatively, the second pouch film 40 also can be a form of a groove 31 formed in the same. In other words, the film may be stored in a first pouch 30 and second pouch film 40, grooves 31, the thicker the electrode assembly 10 than the embodiment of electrode assembly 10 by forming the both. Further, the preparation may be a one film pouch 30 and second pouch film 40 separately, and heat-sealing them in the vertical direction.
[59]
Figure 5 is a 3 a cross-sectional view showing a sealed state after housing the electrode assembly in a pouch case to the schematic of Fig. 6 is a sealing portion folded and then a state in which reverse the top and bottom indicated pouch type secondary battery 5 pouch type secondary battery of of a schematic cross-sectional view.
[60]
When 4 to 6, the groove 31 is the area of ​​the reference surface 33 for the area of ​​the electrode assembly 10 is seated capable bottom surface (36) facing the cover an opening of the groove 31 and the Rather, it has, or may be a larger formation. Here, the reference surface 33 may be understood as the face corresponding to one surface of the second pouch film (40) covering an opening of the groove (31).
[61]
For reference, the sealing being pouch case 20 of the single-cup type, the first pouch film 30 on the superposed a second pouch film 40, and then, formed by heat-sealing the terrace area the other words, overlapping the outer edge portion part ( It has an S). The sealing part (S), can be as shown in Figure 6, the folded electrode assembly 10 direction. The total width of the pouch type secondary battery can be almost equal to the width of the reference surface (33).
[62]
Referring again to Figures 4 and 5, the recess 31 has a first side section 34 and the first side section is formed so narrow as the width of the groove 31 according to the depth from the reference surface (33) gradually ( at the end of 34) to the bottom surface 36 of the deep, where the groove (31) and a second side surface section 35 formed such that total width is gradually widened as the groove 31.
[63]
The first side section (34) takes the form of rounded. In other words, the first side section 34 may take the form into the recess in the electrode assembly 10, direction as viewed the pouch case 20, a portion forming an upper end at the side of the groove (31).
[64]
The first pouch by providing the first side section 34, such as this in the groove 31 of the film 30, it is possible to prevent the stress concentration in the area. When words, the pouch film may be torn not withstand the stress caused by the foaming when it reaches the metal layer and the limits of ductility with the material of the insulating layer in the step of the forming, in particular, the upper edge portion of the groove 31 is the forming process as well as vulnerable to stress after forming. Therefore, according to the present invention, the stress or stress at the top edge portion of the groove 31 by having a first side section 34 forming a round shape agent it can be dispersed without being concentrated. The first side section 34 may correspond to the corners of curvature (R) of the die (100) in the pouch film forming apparatus will be described later.
[65]
On the other hand, the pouch case 20, the internal space efficiency, a first side section 34 is preferably relatively very short in comparison to the second side region (35). In the case of the present embodiment, but the first side section 34 is formed in the groove 31, a first side section 34 it may be omitted from the groove (31). That is, the groove 31 may be formed in a second side section 35, which width is increased from the right reference surface 33 without first side section (34).
[66]
The second side section 35 may be a section that determines the depth of the groove (31). That is, the second side section 35 may be substantially equivalent to the thickness of the electrode assembly 10. The second side section 35 is formed with a total width of the groove 31 so as gradually wider along the depth, in other words depression direction of the groove (31). The second end of the side section 35 are connected to the four corners of the bottom surface 36 of the groove 31. Therefore, the bottom surface 36 of the groove 31, the width may be determined by the inclination or the length of the second side section (35). In the case of this embodiment, a second side section 35 is formed with a reference surface 33 of the groove 31 bottom surface 36 and the groove 31 to the same.
[67]
As in the present invention, the bottom surface 36, the conventional electrode assembly 10, the greater the electrode assembly (10 size than (Fig. 1). When the same as the reference surface 33, the groove 31 of the groove 31 ) it can be secured to the grooves 31.
[68]
More specifically, Fig. 1 and Referring to Figure 5, compared to pouch-type secondary battery according to the invention full width is present in the conventional pouch type secondary battery of the same size as L1, a conventional pouch type secondary battery has a conventional electrode assembly (10 ) of the sum of the width (T1) and a dead space width (2 × L3) and width (2 × L2 of the stress relaxation section of) that is full-width (L1). While the pouch-shaped secondary battery according to an embodiment of the present invention is a full-width (T2) and a first side region (34) total width (2 × L2) the width (L1) the sum of the electrode assembly 10.
[69]
Rearranging, between the conventional pouch type secondary battery as one embodiment of a pouch type secondary battery according to the present invention, the following relational expression is established such.
[70]
L1=T1+(2×L3)+(2×L2) = (T2)+(2×L2)
[71]
Therefore, in the case of the present invention, even if the same total width of the pouch case a larger electrode assembly 10 than the pouch case accommodating an electrode assembly (10) to (20) in accordance with the prior art can be seen the housing are possible.
[72]
In this way, the pouch case 20 has a groove 31, at least a first side section 34, a groove 31 in the end being the bottom surface 36 is formed in the same manner as the reference surface 33 of the according to the invention It can be stored in the electrode assembly 10 having a width corresponding to the entire width, whereby the energy density of the pouch type secondary battery can be increased accordingly.
[73]
Hereinafter, it will be described for a pouch type secondary battery according to another embodiment of the present invention.
[74]
Figure 7 is a perspective view showing an electrode assembly of the pouch type secondary battery according to another embodiment of the present invention, Figure 8 is a schematic cross-sectional view of a pouch type secondary battery according to another embodiment of the present invention.
[75]
7 and 8, the pouch type secondary battery according to another embodiment of the present invention includes an electrode assembly (10 '), the electrode assembly 10', the first pouch film is formed is stored as possible groove (31) ( 30), and includes a pouch case 20 is composed of the first pouch film 30 and the second upper and lower pouch films 40 that can be heat-sealed (H) with.
[76]
The pouch type secondary battery according to another embodiment of the invention only are different, only the configuration and shape of the pouch type secondary battery contrast, the electrode assembly 10 'according to an embodiment of the present invention, the form of the other component and roles can be the same.
[77]
Another embodiment of a pouch-shaped electrode assembly (10 ') of a secondary battery according to the present invention includes one or more battery cells may be composed of a stacked structure (10-1, ..., 10-4). Wherein one or more battery cells (10-1, ..., 10-4), each width may be different. More particularly, the one or more battery cells (10-1, ..., 10-4) each of width when held in the grooves 31 of the pouch case 20, the one or more battery cells (10-1,. ., 0-4) may correspond to a width of the groove 31 in each of which is stacked position.
[78]
For example, one or more battery cells (10-1, ..., 10-4) from, the stacked position the full width of the groove 31 bottom surface 36 and abut the battery cell (10-4) of the grooves from the total width of 31 may be formed in the same manner as the longest width.
[79]
In other words, one or more battery cells (10-1, ..., 10-4) each of which extends the full width at both ends to be in contact with the groove 31 as long as possible in the stacked position is accommodated in a groove 31 formed It can be. Accordingly, when housed in the at least one battery cell (10-1, ..., 10-4) has a groove (31), a part of the both ends may be in contact with the inner surface of the groove (31).
[80]
Such, at least one battery cell (10-1, ..., 10-4) are deposited on the first side section 34 is formed so that width is gradually narrowed in the grooves 31 according to the depth from the reference plane (33) first second battery to be stacked in the battery cell group (10a) and the second side section 1 side at the end of interval 34 to the bottom surface 36. the width of the groove 31 is gradually formed so wide as 35 can be divided into cell group (10b).
[81]
Ereul example, as shown in Figure 8, the first battery cell group (10a) may include a single battery cell 10-1, the second battery cell group (10b) has three battery cells (10-2, ... and it may include 0-4).
[82]
The first width of the battery cell (10-1) of the battery cell group (10a) can correspond to the full width of the groove (31) included in the first side region (34).
[83]
In addition, the second width of the battery cell (10-2, ..., 10-4) of the battery cell group (10b) may correspond to a width of the groove 31 with the second side section (35).
[84]
In other words, the first battery cell group (10a) and the second battery cell group (10b) of one or more battery cells contained in (10-1, ..., 10-4) is by gateum a different width, the electrode assembly (10 ' ) there is a side of the subject in response to the width of the groove 31 is formed in a stepped shape.
[85]
In this way, the side of the electrode assembly 10 'may be made of a structure of the step-like steps formed.
[86]
According to such a pouch type secondary battery according to another embodiment of the present invention, the reference surface 33 at the bottom surface 36 to the widened or at least one battery cell in response to the width of the groove 31 is narrowed down to (10-1 , ..., 10-4) of the full width formed by being extended, the groove 31 as close as possible to the volume to one or more battery cells (10-1, ..., and 10-4) to each other have different volume can.
[87]
Because of this, it is an open area battery is not accommodated in a space of the groove 31 can be by minimizing, improving the energy density of the pouch type secondary battery.
[88]
On the other hand, the electrode assembly 10 'shown in Figs. 7 and 8 has four battery cells (10-1, ..., 10-4) described as formed are laminated, the battery cell (10-1, but. ..., 10-4) can be formed by five or more battery cells are stacked by decreasing the thickness of each of.
[89]
That is, the electrode assembly 10 'being formed by a plurality of battery cells are stacked such that the blank minimizes the space of the groove 31, it is between the in the battery cell each of the both ends of the groove 31, the side distance is reduced groove the space 31 can be filled to a maximum battery cell.
[90]
Hereinafter, it will be described for a pouch type secondary battery according to still another embodiment of the present invention.
[91]
9 is a perspective view showing an electrode assembly of the pouch type secondary battery according to still another embodiment of the present invention, Figure 10 is a schematic cross-sectional view of a pouch type secondary battery according to still another embodiment of the present invention.
[92]
When 9 and 10, a pouch type secondary battery according to still another embodiment of the present invention includes an electrode assembly (10 ') is at least one battery cell (10-1, ..., 10-4) are laminated be made of a structure and, at least one battery cell outer peripheral of (10-1, ..., 10-4) it may be wrapped around the inner film (50).
[93]
More specifically, the inner film 50 can be seen is formed in a tubular gatin one or more battery cells to the inner (10-1, ..., 10-4) is inserted, whereby at least one battery cell (10 shown in Figure 9 1, ..., you can wrap the outer circumference of 10-4).
[94]
This, the inner film 50 is heat (H), if that is applied, can be capable of shrinking a heat-shrinkable film, and the one or more battery cells to the inner (10-1, ..., as described above, 10 & lt; -4 & gt; ) may be applied by a heat load after the insertion, in response to the appearance of one or more battery cells (10-1, ..., 10-4) to wrap the outer circumference.
[95]
In other words, the inner film (50) is open when (H) is applied, at least one battery cell is inserted to the inside surrounded by the outer peripheral form corresponding to the stepped shape of (10-1, ..., 10-4) As it can be contracted.
[96]
In this way, the inner film 50 to each other when receiving at least one battery cell formed in a different width (10-1, ..., 10-4) are laminated in the groove (31), one within the groove 31 or more battery cells (10-1, ..., 10-4) not to the flow of one or more battery cells can be held (10-1, ..., 10-4) from the side.
[97]
On the other hand, the electrode assembly 10 'shown in Figures 9 and 10 includes four battery cells (10-1, ..., 10-4) described as formed are laminated, the battery cell (10-1, but. ..., 10-4) can be formed by five or more battery cells are stacked by decreasing the thickness of each of.
[98]
That is, the electrode assembly 10 'being formed by a plurality of battery cells are stacked such that the blank minimizes the space of the groove 31, it is between the in the battery cell each of the both ends of the groove 31, the side distance is reduced groove It can be filled in the space 31 up to the battery cell. hereinafter, with reference to FIGS. 11 to 14 will be described with respect to the pouch film forming apparatus for forming the above-described pouch case (20).
[99]
11 to 14 are process drawings pouch film forming apparatus according to an embodiment of the present invention showing a forming step of forming the groove 31 in the pouch film.
[100]
Pouch film forming apparatus according to an embodiment of the present invention, the first die unit (120), but form a forming groove 110 of a shape provided so as to be movable relative to the horizontal direction corresponding to the groove 31 and the 2 adhered to the die unit 130, a die 100 and a concave target portion (30a) of the forming around the pouch film forming using the withdrawal mouth is possible, and the air pressure in the recess 110 composed of a surface of the forming recess 110 and a punch 200 disposed to be able to.
[101]
The die 100 acts as a mold of a metal structure having a forming groove 110 of a shape such as groove 31 of the pouch film. In particular, the first die unit 120 and a second die unit (130) constituting the die 100 according to the present invention is provided to be movable relative to the horizontal direction. It is possible to move horizontally, or configured to be horizontally moved together for any remaining one of the first die unit 120 and the second die unit 130.
[102]
The moving means of the die (100) unit is, for example, it is possible to relatively move the LM guide (not shown), the first die unit 120 and / or the second die unit (130) using a. Of course, if the first die unit 120 and the second moving means capable of moving relative to the die unit 130, but may even use any drive device.
[103]
In the present case, the forming in this way the first die unit 120 and the second die-forming recess 110 of the die 100 in the pouch film after the forming by the relative movement unit 130 in the horizontal direction shape as easily It can be pulled out.
[104]
Also, the second die unit 130 has a top surface on which the pouch rests film can be formed relatively wider than that of the first die unit 120. A pouch case 20 of the single-cup type have a shape that one side edge thereof to each other integrally with the first film pouch 30 and second pouch film (40). The single cup the second die unit (130) type pouch case 20, to be suitable for production of the shaping of the groove (31) in the first die unit upper than cotton is made wider, the first pouch film 30 of 120 when it is possible to support the second pouch film 40 portion.
[105]
Punch 200 according to this embodiment the groove of the pouch film placed in a die 100 provided movably up and down for the forming recess 110 of the die 100, the target portion (30a) that the forming groove (110 ) serves to press allows you to get into. In particular, the case of this embodiment, is provided with a plurality of air discharge ports 210, which internally at the lower end can be sprayed with compressed air to the outside of the punch 200's contact with air pressure to the pouch film to the surface of the forming recess 110 can.
[106]
On the other hand, by reducing the stress on the pouch film in the forming process by treatment round the corners of the edge of the punch 200 of the forming recess 110 of the die 100 so as to have a predetermined curvature to prevent damage to the pouch film can.
[107]
In the following it will be briefly described the forming step of the pouch case 20.
[108]
11 and 12, the use of punches 200, place the pouch film to the die 100 press the groove target portion (30a) of the pouch film. At this time, the target groove portion (30a) of the pouch film to reach the forming groove 110, a bottom surface (36).
[109]
Then, as shown in Figure 13, by operating the air compressor (not shown), thereby discharging the compressed air out of the punch 200 through the air discharge opening 210. Accordingly, the pouch film may be in close contact with the side surface of the forming recess 110, when the pouch film forming is complete, the air compressor stops working.
[110]
Then, after the first remove the punch 200 from the die 100, the first die unit 120 and the second die unit securely to the forming pouch film enough to be taken out from the die 100 as shown in Figure 14 ( 130) to move relative. After that it completes the forming step was removed completely from the pouch film die (100).
[111]
With this configuration of the pouch film forming apparatus, has a bottom surface 36 of the groove 31 can have a reference surface 33 is equal to or wider groove 31 and the pouch film forming the pouch film mechanically.
[112]
Hereinafter will be described the pouch film forming apparatus according to another embodiment of the present invention.
[113]
15 and 16 are the flow diagram the pouch film forming apparatus according to another embodiment of the present invention showing a forming step of forming a recess in the pouch film. The same reference numerals as those of the above-described embodiment is naemyeo naeta like elements, and duplicate description of the same members will be omitted.
[114]
Example punch 200 of this embodiment is formed of a soft material that can be contracted or expanded as the injection of air. For instance, the example the punch 200 of the present embodiment when the air is injected into a bladder of the rubber material that can be injected into the air is bound to be the outer shape can be expanded.
[115]
Therefore, the steps 15, by pressing the groove target portion (30a) of the pouch film with a certain amount of air injected into the punch 200 is pushed into the forming groove (110). Then, as shown in Figure 16, the punch 200 forming recess 110 when the re-injecting air in the incoming state Punch 200 is a groove of the forming groove 110, the pouch film and the expansion in the image of the target portion in thereby the contact (30a) on the surface of the forming groove (110).
[116]
Then, after the suctioning air shrinkage punch 200, the die is withdrawn from the first unit 120 and second die units a relative movement-forming groove 110 to the pouch film (130).
[117]
The pouch film forming apparatus according to another embodiment of the invention, the punch 200 is softer than the soft material, so the above-described embodiment of the punch 200 is made of rigid material. Therefore, there is less risk of damage to the pouch can film in the forming process. Further, the punch 200 forming groove 110 groove target portion (30a) is further improved, so pressing the whole of the further higher forming complete adhesion of the forming recess 110 of the pouch film of the pouch film with expansion inside the soft It can be.
[118]
As it described above, but it should be understood that the detailed description and specific examples, the invention is not limited thereto under the technical scope of the present invention by one of ordinary skill in the art various modifications and variations within the equivalent scope of the claims to be described is possible as a matter of course.
[119]
On the other hand, as used herein, down, left and right, before, if a term representing the orientation, such as after use, such terms are intended only for the convenience of explanation, the position of the location or the viewer in which the target object, etc. may vary, it is obvious to those skilled in the art of the present invention.

Claims

[Claim 1]The positive and negative plates as the electrode assembly and a pouch type secondary battery consisting of a pouch case the electrode assembly is formed with a receiving groove disposed opposite to each other as possible, the pouch case includes a first pouch film; And wherein the first comprises a pouch film and heat-sealing the second pouch film, the first pouch film and a groove on at least one of the second pouch film is formed, said groove is possible seated to face the electrode assembly the area of ​​the bottom surface of the open pouch, characterized in that equal to the area of ​​the reference surface, or formed to cover a larger portion of the groove-type secondary battery.
[Claim 2]
The method of claim 1, wherein the groove is, the according to the depth from the reference surface and the first side section having a width of said groove so as gradually narrowed from the first end of the first side section width of the groove to the bottom surface progressively the second side section pouch type secondary battery, comprising a step of including the so formed as widened.
[Claim 3]
The method of claim 2, wherein the first side section is a pouch-shaped secondary battery, characterized in that takes a rounded shape.
[Claim 4]
The method of claim 2, wherein the width of the electrode assembly is the first side pouch type secondary battery, comprising a step corresponding to the width of the recess in the interval end points.
[Claim 5]
The method of claim 2, wherein the electrode assembly, a pouch type, characterized in that the at least one battery cell is made of a laminate structure, of the one or more battery cells, each full width corresponds to the width of the groove in the stacked position rechargeable battery.
[Claim 6]
The method of claim 5, wherein in said at least one battery cell, the first battery cell group is first laminated on the side section, width of the grooves included in the first the first side section each width is a battery cell of the battery cell group corresponding to the second battery cell group from among the at least one battery cell, it is laminated to the second side section, each battery cell of the full width of the second battery cell group to correspond to the width of the recesses included in the second side section the pouch type secondary battery, comprising a step of.
[Claim 7]
The method of claim 1, wherein the inside of the wrapping the outer circumference of the electrode assembly accommodated in the inner film of the pouch case; The pouch type secondary battery, comprising a step of including.
[Claim 8]
The method of claim 1, wherein the groove is the first pouch type secondary battery is formed at a film pouch.
[Claim 9]
The method of claim 8 wherein the formation of the first pouch film and the second pouch is formed in a single sheet of film of the film, the first is that the second pouch film folded in one pouch film single cup-type pouch case the pouch type secondary battery according to claim.
[Claim 10]
Claim that as the pouch film forming apparatus for forming a pouch case having a recess according to 1, wherein forming the forming groove having a shape corresponding to the recess provided so as to be movable relative to the horizontal direction the first die unit and the second die die consisting of a unit; And the pouch film forming apparatus characterized in that it comprises a punch provided able to be adhered to a surface of the groove forming a groove around the target portion of the pouch film forming using the take-mouth possible and the air pressure in the forming groove.
[Claim 11]
11. The method of claim 10, wherein the second die unit pouch film forming apparatus such that a top surface on which the pouch rests film formed relatively wider than that of the first die unit.
[Claim 12]
11. The method of claim 10, wherein the punch, the pouch film forming apparatus comprising a plurality of air ejection openings capable of ejecting the compressed air from the inside to the outside.
[Claim 13]
11. The method of claim 10, wherein the punch, the pouch film forming apparatus to the air is formed of a soft material capable of contracting or expanding in accordance with the injection, characterized.