KR20230130928A - Secondary Battery and Pressure Jig Device - Google Patents

Abstract

A secondary battery according to an embodiment of the present invention includes an electrode assembly in which positive plates, negative electrode plates, and separators are alternately stacked between the positive and negative electrode plates, and the outermost separator is formed to surround the stacking direction, and A tab portion is formed by extending the positive electrode plate or the negative electrode plate to one or both ends of the electrode assembly in a direction perpendicular to the direction in which the separator surrounds, and the separator may extend from the electrode assembly in an extended direction in which the tab portion is formed. .
According to one embodiment of the present invention, when the temperature of the electrode assembly rises and the separator shrinks, the positive or negative electrode plate is exposed to the outside of the separator, thereby preventing a short circuit from occurring.

Description

Secondary battery and pressure jig device {Secondary Battery and Pressure Jig Device}

The present invention relates to a secondary battery and a pressurizing jig device according to an embodiment.

Recently, the demand for secondary batteries capable of repeated charging and discharging has been rapidly increasing, ranging from lightweight portable devices such as mobile phones, laptop computers, or cameras to electric vehicles and hybrid vehicles. Accordingly, development to improve the safety of secondary batteries is being actively conducted. there is.

Secondary batteries are equipped with an electrode assembly formed by sequentially stacking a positive electrode plate, a separator, and a negative electrode plate. Additionally, the separator is inserted between the positive and negative electrode plates to prevent short circuit between the positive and negative plates, thereby ensuring the safety of the secondary battery.

However, the separator exposed to a high-temperature environment undergoes thermal contraction, and at this time, a short circuit occurs between the positive and negative electrode plates in the area where shrinkage occurs, resulting in fire or explosion, which poses a problem that cannot guarantee the safety of the secondary battery.

KR 10-1910686 B1

The secondary battery according to an embodiment of the present invention prevents short circuits from occurring by preventing the positive or negative plate surrounded by the separator from being exposed to the outside of the separator even if the separator is deformed when the electrode assembly is exposed to high temperature. You can.

The pressurizing jig device according to an embodiment of the present invention prevents or delays the electrode assembly from igniting or exploding due to contraction of the separator interposed between the positive and negative electrode plates when the electrode assembly is exposed to high temperature. Safety can be improved.

A secondary battery according to an embodiment of the present invention includes a positive electrode plate, a negative electrode plate, and a separator alternately stacked between the positive electrode plate and the negative electrode plate, an electrode assembly formed so that the separator is located at the outermost portion, and the positive electrode plate or the negative electrode plate. It is formed to extend from one or both ends of the electrode assembly and includes a tab portion to which a lead portion is coupled, and the separator may extend from the electrode assembly in the direction in which the tab portion is formed.

In addition, the secondary battery according to an embodiment of the present invention, It further includes a separator stack formed by stacking the plurality of extended separators, and a tab stack formed by alternately stacking the extended positive or negative electrode plates and the extended separator, wherein the tab stack is between the separator stacks. can be formed.

Here, the separator stacked part and the tab stacked part may be pressurized by a pressurizing jig device.

The pressurizing jig device according to an embodiment of the present invention is an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator are alternately stacked between the positive and negative electrode plates, and the outermost separator is formed to surround the stacking direction. The electrode assembly is coupled to one end or both ends perpendicular to the stacking direction and forms a separator stacked portion and the tab portion extending in the direction in which the tab portion formed by stacking the positive electrode plate or the negative electrode plate extending to one end or both ends of the electrode assembly is formed. It may include a pressing jig formed to press together the tab stacking portion formed by alternately stacking the positive or negative electrode plate extending to one or both ends of the tab portion and the separator extending in the direction in which the tab portion is formed.

Here, the pressing jig includes a first pressing part that presses the tab stacking part; and a second pressing part that presses the separator stacked part, wherein the first pressing part and the second pressing part are formed to be stepped to correspond to the thickness difference between the separator stacked part and the tab stacked part pressed by the pressing jig. It can be.

In addition, the pressing jig includes an upper pressing part formed on the separator stacked part and the tab stacked part, and a lower pressing part formed on the lower part of the separator stacked part and the tab stacked part to face the upper pressing part, and the upper pressing part. The pressing part and the lower pressing part each include a pressurizing fixing connection at both ends, and the pressing fixing connecting part can allow the upper pressing part and the lower pressing part to press the separator stacked part and the tab stacked part with a predetermined pressure.

Here, the pressure fixing connection part is formed at both ends of the upper press part, and the fixing part extending in the downward direction is formed at both ends of the lower press part, and the fixing part is formed in the upper direction, and the fixing part is coupled. It may include a lower pressure fixing connection including an insertion portion provided with an adjustment portion for adjusting the position.

Here, the fixing part has an inclined section formed on at least one surface, and the adjusting part is formed to bend only downward by the inclined section, and the fixing part is received in stages, so that the space between the upper pressing part and the lower pressing part is maintained. The upper pressurizing part and the lower pressurizing part can be combined with the distance adjusted in stages.

In addition, the upper pressing part includes a first upper pressing part that presses the separator stacked part and a second upper pressing part that presses the tab stacked part, and the lower pressing part includes a first lower pressing part that presses the separator stacked part and It includes a second lower pressing part that presses the tab stacked part, and the first upper pressing part and the second pressurized part to correspond to a thickness difference formed on the upper surface of the tab stacked part and the separator stacked part pressed by the upper pressing part. The upper pressing part is formed to be stepped, and the first lower pressing part and the second lower pressing part are formed to be stepped to correspond to the thickness difference formed on the lower surface of the separator stacked part and the tab stacked part pressed by the lower pressing part. It can be.

Here, the size of the step formed in the first upper pressing part and the second upper pressing part is smaller than the thickness difference between the upper surfaces of the separator stacked part and the tab stacked part pressed by the upper pressing part, and the lower A step formed in the first lower pressing part and the second lower pressing part may be smaller than a thickness difference in the lower surfaces of the separator stacked part and the tab stacked part pressed by the pressing part.

In addition, the upper pressing part and the lower pressing part may be formed with a predetermined surface roughness to generate frictional force on the surface in contact with the separator stacked part and the tab stacked part pressed by the pressing jig.

In addition, the upper pressing part and the lower pressing part may have concavo-convex portions facing each other and protruding at predetermined intervals alternately formed on surfaces in contact with the tab laminated portion and the separator laminated portion.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, terms or words used in this specification and claims should not be construed in their usual, dictionary meaning, and the inventor may appropriately define the concept of the term in order to explain his or her invention in the best way. It must be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it is.

The secondary battery according to an embodiment of the present invention is formed to extend in a direction perpendicular to the direction in which the separator is wound, thereby preventing or delaying the occurrence of a short circuit due to deformation of the separator even when the electrode assembly is exposed to high temperature.

The pressurizing jig device according to an embodiment of the present invention can prevent or delay the shrinkage of the separator by simultaneously pressurizing the separator stacked portion and the tab stacked portion of the electrode assembly.

In addition, the first pressing part that presses the tab stack and the second pressing part that presses the separator stack are formed to form a step equal to the thickness of the tab stack and the separator stack, so that the tab stack and the separator stack are pressed with the same pressure. can do.

In addition, by adjusting the step between the first pressing part and the second pressing part, the separator stacked part and the tab stacked part can be pressed with different pressures depending on the physical properties of the separator stacked part and the tab stacked part.

In addition, the upper press part and the lower press part are coupled while facing each other through pressure fixing connectors formed at both ends of the upper press part and the lower press part, and the distance between the upper press part and the lower press part is adjusted to adjust the distance between the upper press part and the lower press part. The pressure applied to the separator stack and the tab stack can be adjusted.

In addition, roughness is formed on the surfaces of the upper press portion and the lower press portion that contact the separator stack portion and the tab stack portion, thereby providing greater friction.

Additionally, different roughnesses may be formed depending on the physical properties of the separator stack and the tab stack to provide different friction forces.

In addition, protrusions that face each other at a predetermined distance and alternately protrude are formed on the surfaces of the upper press portion and the lower press portion in contact with the tab laminated portion and the separator laminated portion, thereby forming a contact between the tab laminated portion and the separator laminated portion. By expanding the contact area, shrinkage of the separator can be further prevented.

In addition, when performing main-welding connecting the tab portion and the lead portion, the tab portion is fixed in a laminated state by the pressurizing fixing mechanism device, so pre-welding is not necessary, improving operation rate during the process. and can contribute to cost reduction.

Figure 1a is a schematic diagram showing that the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention is disposed on the electrode assembly of a bidirectional cell, and Figure 1b is a schematic diagram showing the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention in a unidirectional cell. A schematic diagram showing the arrangement of the electrode assembly of
Figure 2 is a perspective view showing the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention disposed on the electrode assembly.
Figure 3 is an exploded perspective view of Figure 2
Figure 4 is a schematic diagram of one side of the cross section along AA' in Figure 2
Figure 5 is a schematic diagram of one side of the cross section along BB' in Figure 2
Figure 6 is a front view of the electrode assembly on which the pressing jig of the pressing jig device according to an embodiment of the present invention is disposed, viewed from the tab portion (T).
Figure 7 is a plan view of the portion where the pressing jig is coupled in Figure 2
Figure 8 is a front view of the pressure jig of the pressure jig device according to an embodiment of the present invention.
Figure 9 is a front view of the direction of the tab stack and the separator stack of the electrode assembly according to an embodiment of the present invention.
Figure 10 is an exploded perspective view of the coupling portion of the pressurizing jig and the electrode assembly of the pressurizing jig device according to an embodiment of the present invention.
Figure 11 is an exploded front view of the coupling portion of the pressurizing jig and the electrode assembly of the pressurizing jig device according to an embodiment of the present invention.
Figure 12 is an exploded cross-sectional view of the coupling configuration of the pressure fixing connection portion of the pressure jig in the pressure jig device according to an embodiment of the present invention.
Figure 13 is a cross-sectional view showing a predetermined roughness treatment on the mating surface of the electrode assembly in the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention.
Figures 14 and 15 are cross-sectional views showing a concavo-convex shape applied to the mating surface of the electrode assembly in the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention.

The objects, advantages, and features of an embodiment of the present invention will become more apparent from the following description of the embodiment in conjunction with the accompanying drawings. In this specification, when adding reference numerals to components in each drawing, it should be noted that identical components are given the same number as much as possible even if they are shown in different drawings. In addition, terms such as “one side”, “other side”, “first”, “second”, etc. are used to distinguish one component from another component, and the components are not limited by these terms. no. Hereinafter, in describing an embodiment of the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the embodiment of the present invention will be omitted.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1a is a schematic diagram showing that the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention is disposed on the electrode assembly of a bidirectional cell, and Figure 1b is a schematic diagram showing the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention in a unidirectional cell. A schematic diagram showing the arrangement of the electrode assembly 2, Figure 2 is a perspective view showing the pressurizing jig device according to an embodiment of the present invention arranged in the electrode assembly, Figure 3 is an exploded perspective view of Figure 2, Figure 4 is a drawing Figure 5 is a schematic diagram of one side of the cross section along line A-A' of Figure 2, Figure 5 is a schematic diagram of one side of the cross section along line B-B' of Figure 2, and Figure 6 shows the electrode assembly on which the pressure jig of the pressure jig device according to an embodiment of the present invention is disposed. It is a front view seen from the tab part, and Figure 7 is a plan view of the part where the pressing jig is coupled in Figure 2.

In a secondary battery according to an embodiment of the present invention, a positive electrode plate (P), a negative electrode plate (N), and a separator (S) are alternately stacked between the positive electrode plate (P) and the negative electrode plate (N), and at the outermost layer, An electrode assembly formed so that the separator S is located, and the positive electrode plate P or the negative electrode plate N are formed extending from one or both ends of the electrode assembly 2, and a tab to which the lead portion L is coupled. May include wealth. Here, the separator (S) may extend from the electrode assembly (2) in the direction in which the tab portion (T) is formed.

Through this configuration, the secondary battery according to an embodiment of the present invention prevents the positive plate (P) or negative plate (N) from being exposed from the separator (S) and causing a short circuit even if the temperature rises and the separator (S) shrinks. It can be prevented.

Hereinafter, a secondary battery according to an embodiment of the present invention will be described in detail.

The electrode assembly (2) is divided into a stack type, a folding type, a stack & folding type, etc. depending on the method of stacking, including a positive electrode plate (P), a separator (S), and a negative electrode plate (N). ) There is no particular limitation as long as it is stacked in order. The positive electrode plate (P) is formed by applying a positive electrode active material to a positive electrode current collector, and the negative electrode plate (N) is formed by applying a negative electrode active material to a negative electrode current collector. In addition, the positive electrode current collector and the negative electrode current collector may be formed of a metal material, and the present invention is not particularly limited to the shape or material of the positive electrode plate (P) and the negative electrode plate (N).

In the present invention, as shown in Figures 2 and 3, the electrode assembly 2 is formed by alternately stacking a positive electrode plate (P), a separator (S), and a negative electrode plate (N), with a separator (S) at the outermost layer. It can be defined as a placed laminate. A tab portion (T), which will be described later, is formed on the electrode assembly 2 to form a secondary battery according to an embodiment. Meanwhile, the separator S disposed on the outermost part of the electrode assembly 2 may be wound in one direction to surround the entire stacked structure of the electrode assembly 2.

In the secondary battery according to an embodiment of the present invention, the tab portion (T) may be formed by stacking a positive electrode plate (P) or a negative electrode plate (N) extending from the electrode assembly (2). Specifically, the tab portion (T) may be formed by extending the positive electrode plate (P) or the negative electrode plate (N) from one or both ends in the longitudinal direction of the electrode assembly (2), and the tab portion (T) may have a lead portion (L). ) can be combined. That is, the tab portion T may be formed by extending the positive electrode plate P or the negative electrode plate N from one or both ends of the electrode assembly 2 in the longitudinal direction.

Additionally, as shown in FIGS. 2 and 3, a lead portion (L) may be coupled to the tab portion (L). The lead portion (L) may be coupled to the surface of the tab portion (L) by welding. The lead portion (L) can electrically connect an external power source and the electrode assembly (2).

The separator (S) may extend in the direction in which the tab portion (T) formed at one or both ends of the electrode assembly (2) is formed. That is, as shown in Figures 4 and 5, the positive electrode plate (P), the separator (S), and the negative electrode plate (S) are alternately stacked in order to form the electrode assembly (2), and the separator laminated in the electrode assembly (2) (S) may extend in the longitudinal direction of the secondary battery in which the tab portion (T) is formed. At this time, the separator (S) may be stacked and disposed on the outermost part of the electrode assembly (2) to prevent short circuit of the electrode assembly (2).

Meanwhile, in the present invention, the separator S is not particularly limited as long as it has a structure disposed at the outermost part of the electrode assembly 2. For example, when the electrode assembly 2 is stacked, the separator S is stacked first and last, so that the separator S can be placed at the outermost part of the electrode assembly. Alternatively, the positive electrode plate (P), the separator (S), and the negative electrode plate (N) are stacked alternately in that order, with the separator (S) laminated last winding the entire laminate in one direction, and the separator (S) is the electrode. It can be placed at the outermost part of the assembly (2).

Here, the stacking direction may mean the MD direction (Machine Direction) in the manufacturing process of the electrode assembly 2, but this is not particularly limited as it means one direction of the electrode assembly 2. In addition, winding means that the last-laminated separator (S) is laminated in the continuous stacked structure of the previously-laminated positive electrode plate (P), separator (S), and negative electrode plate (N) in the stacking direction, that is, the electrode assembly (2). ) may refer to one direction surrounding the longitudinal direction.

When the electrode assembly 2 is exposed to a high temperature environment, the separator S may shrink compared to the positive electrode current collector and the negative electrode current collector due to its material properties, resulting in a short circuit. At this time, in the stacking direction in which the separator (S) is wound, that is, in the MD direction, tension acts to offset the shrinkage force that causes the separator (S) to shrink, or a short circuit occurs because an amount of free space is created as much as the separator (S) is wound. This can be prevented or delayed, but since there is no structure or separate device that can buffer the shrinkage of the separator (S) in the direction perpendicular to the winding direction, the negative electrode plate (N ) and the positive plate (P) may have electrical short circuits or problems.

Ultimately, according to one embodiment of the present invention, the stability of the electrode assembly 2 can be maintained by extending the separator S in a direction opposite to the contraction direction to prevent or buffer the contraction of the separator S. There is.

In addition, the secondary battery according to an embodiment of the present invention includes a separator stacked portion 21 formed by stacking a plurality of the extended separators S, the extended positive or negative electrode plate, and the extended separator alternately. It may further include a tab stacked portion 22 formed by stacking. Here, the tab stacked portion 22 may be formed between the separator stacked portions 21.

Through this structure, the separator prevents or delays shrinkage in the inner direction of the electrode assembly 2, so that even if the electrode assembly 2 is exposed to high temperature, the positive electrode plate (P) and the negative electrode plate (N) contact each other, preventing short circuit. can prevent or delay its occurrence.

As shown in FIG. 4, the tab stack 22 forms a tab portion (T) and a separator (S) extending in the direction in which the tab portion (T) extending from one end or both ends of the electrode assembly 2 is formed. The positive electrode plate (P) or the negative electrode plate (N) extending to one or both ends of the electrode assembly 2 may be formed by alternately stacking each other. As shown in FIG. 4, the tab stacked portion 22 may be formed between the electrode assembly 2 and the tab portion T based on the longitudinal direction of the secondary battery. And, as shown in FIGS. 2 and 3, the separator stacked portion 21 and the tab stacked portion 22 may be pressed by a pressing jig 1, which will be described later.

In addition, as shown in FIG. 7, based on the surface (width direction of the secondary battery) in contact with the pressing jig 1, the tab stacked portion 22 is adjacent to the separator stacked portion 21. ) can be formed between. Meanwhile, this explanation is based on a bidirectional cell in which tab portions (T) are formed at both ends of the electrode assembly (2). When the secondary battery of the present invention is a unidirectional cell (see FIG. 1B), two tab stacks 22 may be formed on one end or the other end of the electrode assembly 2. Here, three separator stacked parts 21 are formed in the width direction of the secondary battery, and one tab stacked part 22 may be formed between the three separator stacked parts 21.

Through this structure, each separator (S) disposed between the positive electrode plate (P) or the negative electrode plate (N) in the tab stack portion 22 is tensioned along the longitudinal direction of the electrode assembly 2 by the tab portion T. This can be inflicted.

Specifically, referring to FIG. 4 , the tab stack portion 22 is formed by alternately stacking a positive electrode plate (P) and a separator (S) extending from the electrode assembly (2). In the outer direction of the electrode assembly 2, only the positive electrode plate P extending from the electrode assembly 2 is laminated and fused to form a tab portion T. Here, even if the positive electrode plate (P) extending from the electrode assembly 2 shrinks or expands due to heat, the entire positive electrode plate (P) laminated in the tab stacking portion 22 can be uniformly deformed by the tab portion (T). In addition, since the tab portion (T) is fused to the outside of the tab lamination portion 22, the friction force between the positive electrode plate (P) and the separator (P) disposed on the tab lamination portion 22 can be increased.

That is, in the tab stacked portion 22 disposed between the stacked structure of the electrode assembly 2 and the tab portion T, the friction between the contact surfaces of the alternately stacked positive electrode plates P and the separator S is improved. , it is possible to prevent or delay as much as possible the shrinkage of the separator (S), which has a relatively high thermal contraction rate.

Meanwhile, this is explained based on FIG. 4, and it should be understood that the negative electrode plate (N), not the positive plate (P), may extend from the electrode assembly (2) to form the tab portion (T) or the tab stacked portion (22). .

As shown in FIG. 5, the electrode assembly 2 has a separator S extending in the direction in which the tab portion T is formed, and the separators extending from the electrode assembly 2 are stacked on each other to form a separator stack 21. can be formed. As shown in FIG. 3, the separator stacked portion 21 may be formed parallel to the tab stacked portion 22.

That is, the separator (S) extends at a predetermined distance from the electrode assembly (2), and the portion where the extended separators (S) are laminated is called the separator stacked portion 21, and the separator (S) extended from the electrode assembly (2) and the electrode. A portion where the positive electrode plates (P) or negative electrode plates (S) extending from the assembly 2 are alternately stacked may be referred to as the tab stacking portion 22.

In the pressurizing jig device according to an embodiment of the present invention, a positive electrode plate (P), a negative electrode plate (N), and a separator (S) are alternately stacked between the positive electrode plate (P) and the negative electrode plate (N), and at the outermost The stacked separator (S) is coupled to one or both ends perpendicular to the stacking direction of the electrode assembly (2) formed to surround the stacking direction, and the positive electrode plate (P) extends to one or both ends of the electrode assembly (2). ) or a separator stacked portion 21 extending in the direction in which the tab portion T formed by stacking the negative electrode plates N is formed, and the separator stacked portion 21 extending to one or both ends of the electrode assembly 2 to form the tab portion T. A pressurizing jig ( 1) may be included.

As shown in FIG. 1A, the pressurizing jig device according to an embodiment of the present invention can be coupled to both ends of the electrode assembly 2 of the bidirectional cell, and as shown in FIG. 1B, the electrode assembly of the unidirectional cell It may include a pressurizing jig (1) coupled only to one end of (2).

However, this is only an example, and the pressurizing jig device according to an embodiment of the present invention prevents electrical short circuits between the negative plate (N) and the positive plate (P) due to shrinkage of the separator (S), regardless of the type of cell. Of course, it can be applied to various structures of the electrode assembly 2 to prevent the occurrence, and the separator stacked portion 21 of the electrode assembly 2 and the tab stacked portion 22 of the electrode assembly 2, which will be described below, It can be said that anything that is arranged to pressurize together is included.

As shown in FIGS. 2 to 5, the pressurizing jig 1 according to an embodiment of the present invention has a separator stacked portion formed by stacking separators extending from the electrode assembly 2 in the direction in which the tab portion T is formed. (21) and a tab stack portion 22 formed by alternately stacking a positive electrode plate (P) or negative electrode plate (N) extending from the electrode assembly 2 and a separator S extending from the electrode assembly 2. Can be formed to press together.

The tab portion (T) is a portion where the positive plate (P) or negative plate (N) is extended and laminated, and later serves as an electrical connection terminal through the lead portion. The tab portion (T) is laminated by extending either the positive electrode plate (P) or the negative electrode plate (N). At this time, the separator (S) is also extended so that when the tab portion (T) is pressed, the portion of the separator (S) extended together is also extended. Since they can be pressed together, the separator (S) of the tab portion (T) can also have a supporting force due to contraction.

Here, the pressing jig 1 is shown in the drawing as being formed to be pressed from the top and bottom, but this is only one embodiment, and of course, various structures that can be pressed from either the top or bottom can be applied.

In addition, as shown in FIGS. 6 and 7, the pressurizing jig device according to an embodiment of the present invention includes a pressurizing jig (1), a first pressurizing part that presses the separator stacking part 21, and the tab stacking. It includes a second pressing part 12 that pressurizes the part 22. The first pressing part 11 and the second pressing part 12 are formed to be stepped to correspond to the thickness difference between the separator stacked part 21 and the tab stacked part 22 pressed by the pressing jig. It can be.

There is bound to be a physical thickness difference between the separator stacked portion 21 and the tab stacked portion 22 pressed by the pressurizing jig 1 of the pressurizing jig device according to an embodiment of the present invention. That is, the tab stack 22 includes a negative electrode plate (N) or a positive plate (P), and has a thickness difference from the separator stack 21, and the tab stack 22 has a thickness different from the separator stack 21. There are cases where the applied pressure must be adjusted due to different physical properties.

Therefore, the step for adjusting the pressure is applied to the first press part 11 and the second press part 12 of the press jig 1, so that the press jig 1 is stacked with the separator laminated part 21. When pressing the parts 22 simultaneously, the applied pressure can be adjusted to be the same or different.

In addition, as shown in FIG. 7, the pressurizing jig 1 is disposed on one end of the electrode assembly 2 in an area that does not overlap with the welding position of the lead portion L. That is, the lead portion (L) is welded in the overlapping area of the tab portion (T), and the pressurizing jig (1) is arranged so that it does not overlap the area where the lead portion (L) and the tab portion (T) are joined by welding. The actual lead portion (L) is not pressurized.

Figure 8 is a front view of the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention, Figure 9 is a front view in the direction of the tab stack and separator stack of the electrode assembly according to an embodiment of the present invention, and Figure 10 is a front view of the pressurizing jig device according to an embodiment of the present invention. Figure 11 is an exploded perspective view of the coupling portion of the pressurizing jig and the electrode assembly of the pressurizing jig device according to an embodiment of the present invention. , Figure 12 is an exploded cross-sectional view of the coupling configuration of the pressure fixing connection portion of the pressure jig in the pressure jig device according to an embodiment of the present invention.

As shown in FIG. 9, the difference in thickness on one surface of the separator stacked portion 21 and the tab stacked portion 22 is defined as C'. In addition, as shown in FIG. 8, the height of the step on one surface of the first pressing part and the second pressing part of the pressing jig 1, that is, the thickness on one surface of the separator stacked part 21 and the tab stacked part 22 The height of the step on one surface of the first pressing part and the second pressing part formed to correspond to the difference is defined as C.

In addition, as shown in FIG. 11, in the pressing jig device according to an embodiment of the present invention, the pressing jig 1 is an upper pressing part formed on the separator stacked part 21 and the tab stacked part 22. (100) It includes a lower pressing part 200 formed below the separator stacked part 21 and the tab stacked part 22 to face the upper pressing part 100, and the upper pressing part 100 and the The lower pressing part 200 includes pressure fixing connections at both ends, and the press fixing connection parts are connected to the upper press part 100 and the lower press part 200 to the separator stacked part 21 and the tab stacked part. (22) can be pressurized to a predetermined pressure.

In the upper pressing part 100, a first upper pressing part 110 is defined that presses only the separator stacked part 21, a second upper pressing part 120 presses only the tab stacked part 22, and a lower pressing part ( Similarly, 200) will be composed of a first lower pressing part 210 that presses only the separator stacked part 21 and a second lower pressing part 220 that presses only the tab stacked part 22. Hereinafter, the names of these components will be unified and explained.

In addition, the step C of the pressing jig 1 corresponds to the difference in thickness (see C in FIG. 8) on one surface of the tab stacked part 22 and the separator stacked part 21 pressed by the upper pressing part 100. It is defined as the step value or the step value corresponding to the difference in thickness (see C in FIG. 8) on the other surfaces of the tab stacked portion 22 and the separator stacked portion 21 pressed by the lower pressing portion 200. In the end, the step C of the pressurizing jig 1 is because the pressing force can be adjusted through the relationship between the step between the pressurizing tab lamination section 22 and the separator lamination section 21, so the step of the device being pressed and the target surface being pressed It can be defined by the relationship with the thickness difference.

The upper pressing part 100 is formed on the upper part of the separator stacked part 21 and the tab stacked part 22. That is, the upper pressing part 100 is formed at the upper part of the separator stacked part 21 and the tab stacked part 22 in the thickness direction. The upper pressing part 100 may include a first upper pressing part 110 that presses the tab stacked part 22 and a second upper pressing part 120 that presses only the separator stacked part 21.

The lower pressing part 200 is formed at the lower part of the separator stacked part 21 and the tab stacked part 22. That is, the separator stacked portion 21 and the tab stacked portion 22 are formed to face the upper pressing portion 100 at the lower portion in the thickness direction. Likewise, the lower pressing part may include a first lower pressing part 210 that presses the tab stacked part 22 and a second lower pressing part 220 that presses only the separator stacked part 21.

The first upper pressing part 110, the first lower pressing part 210, the second upper pressing part 120, and the second lower pressing part 220 are combined in opposite directions to form a tab stacking part 22. and the separator stack 21 can be pressurized.

The pressurizing fixing connection portion is formed at both ends of the upper pressing portion 100 and the lower pressing portion 200, and the upper pressing portion 100 and the lower portion are formed to pressurize the separator stacked portion 21 and the tab stacked portion 22. The pressure parts 200 are coupled to each other so that a predetermined pressure is applied to the separator stacked part 21 and the tab stacked part 22.

The pressure fixing connection unit couples the upper press part 100 and the lower press part 200 to each other while adjusting the distance between the upper press part 100 and the lower press part 200, thereby forming the upper press part 100. and the distance between the lower pressure parts 200 can be fixed and the pressure applied to the separator stacked part 21 and the tab stacked part 22 can be adjusted.

That is, the pressure fixing connection unit is connected to the upper pressurizing part with the separation distance between the upper pressurizing part 100 and the lower pressurizing part 200 being smaller than the thickness of the separator laminated part 21 or the tab laminated part 22. (100) and the lower pressing part 200 are coupled to each other. However, so that the separator stacked portion 21 and the tab stacked portion 22 can be pressed together, the separation distance between the upper pressing portion 100 and the lower pressing portion 200 is made smaller than the thickness of the separator stacked portion 21. It is desirable to adjust it so that it is compressed.

On the other hand, if the pressure fixing connection part has a structure in which the upper pressurizing part 100 and the lower pressurizing part 200 are joined while facing each other, the separator stacked part 21 and the tab stacked part 22 can be pressed at a predetermined interval at the same time. There is no particular limitation to the structure shown.

Specifically, as shown in Figure 13, the pressure fixing connection part is formed at both ends of the upper press part 100, and the upper press fixation connection part 130 and the lower part are formed with fixing parts 131 extending in the downward direction. It is formed at both ends of the pressure part 200, extends upward and is coupled to the fixing part, and may include a lower pressure fixing connection part 230 including an insertion part provided with an adjusting part 231 for adjusting the coupling position.

The fixing part 131 formed on the upper pressure fixing connection part 130 and the insertion part provided with the adjustment part formed on the lower pressure fixing connection part 230 are coupled to each other, so that the upper pressure fixing connection part 130 and the lower pressure fixing connection part 230 are connected to each other. They are coupled, and as a result, the upper pressing part 100 and the lower pressing part 200 are coupled to each other while being spaced apart at a predetermined interval.

The fixing portion 131 of the upper pressure fixing connection portion 130 may include an inclined section that narrows from the top to the bottom. In addition, it is formed at the insertion part of the lower pressure fixing connection part 230, and may include an adjusting part 231 formed so that the fixing part 131 is caught.

When the upper pressure fixing connection 130 and the lower pressure fixation connection 230 are combined, the adjusting part 231 is bent downward due to the inclined section of the fixing part 131 and the fixing part 131 can be inserted. A space is created. And when the fixing part 131 is further lowered and the entire inclined section is located at the lower part of the adjusting part 231, the adjusting part 231 is returned to its original position by elasticity. Then, the upper surface of the inclined section of the fixing part 131 and the lower surface of the adjusting part 231 are caught, so that the upper pressure fixing connection part 130 and the lower pressure fixing connection part 230 are fixed, and thus the upper pressure fixing part 100 and the lower pressing portion 200 are coupled to each other.

In this way, the lower pressure fixing connection part 230 adjusts the separation distance between the upper pressure part 100 and the lower pressure part 200 by adjusting the position where the fixing part 131 is attached, thereby forming the separator laminated part 21 and the tab laminated part. The pressure pressing the unit 22 can be adjusted. However, the above fixing part 131 and adjusting part 231 are only one example, and the fixing part 131 and adjusting part 231 face the upper pressing part 100 and the lower pressing part 200. The configuration that is combined in this state is not limited to the above example.

In the pressurizing jig device according to an embodiment of the present invention, as shown in FIGS. 10 and 11, the upper pressurizing part 100 of the pressurizing jig 1 is the first pressurizing the separator stacked part 21. It includes an upper pressing part 110 and a second upper pressing part 120 that presses the tab stacked part 22, and the lower pressing part 200 includes a first pressing part that presses the separator stacked part 21. It includes a lower pressing part 210 and a second lower pressing part 220 that presses the tab stacking part 22, and the separator stacking part 21 and the tab pressurized by the upper pressing part 100. The first upper pressing part and the second pressing part are formed to be stepped to correspond to the thickness difference formed on the upper surface of the stacked part 22, and the separator stacked part 21 is pressed by the lower pressing part 220. ) and the first lower pressing portion 210 and the second lower pressing portion 220 may be formed to be stepped to correspond to the thickness difference formed on the lower surface of the tab stacking portion 22.

As described above, the separator stacked portion 21 and the tab stacked portion 22 may have a difference in thickness, and overlapping details will be omitted.

As shown in FIG. 11, the first upper pressing portion 110 and the second upper pressing portion 120 have a thickness formed on the upper surfaces of the separator stacked portion 21 and the tab stacked portion 22. It may be formed to be stepped to correspond to the difference, and the first lower pressing part 210 and the second lower pressing part 220 are formed on the lower surfaces of the separator stacked part 21 and the tab stacked part 22. It may be formed in steps to correspond to the difference in thickness formed in.

That is, the first upper pressing part 110 and the second upper pressing part 120 may be formed so that the portions facing the upper surfaces of the separator stacked part 21 and the tab stacked part 22 are stepped, and the first upper pressing part 110 and the second upper pressing part 120 The lower pressing portion 210 and the second lower pressing portion 220 may be formed so that the portions facing the lower surfaces of the separator stacked portion 21 and the tab stacked portion 22 are stepped.

In addition, the shape of the step corresponding to the upper surface of the separator stacked portion 21 and the tab stacked portion 22 in the first upper pressing portion 110 and the second upper pressing portion 120 is the separator stacked portion 21. And it can be formed to correspond to the shape of the difference in thickness formed on the upper surface of the tab stacked portion 22. In addition, the shape of the step corresponding to the lower surface of the separator stacked portion 21 and the tab stacked portion 22 in the first lower pressing portion 210 and the second lower pressing portion 220 is the separator stacked portion 21. And it can be formed to correspond to the shape of the difference in thickness formed on the lower surface of the tab stacked portion 22.

The size of the step formed to correspond to the upper surface of the separator stacked portion 21 and the tab stacked portion 22 in the first upper pressing portion 110 and the second upper pressing portion 120 is the separator stacked portion 21. ) and the difference in thickness formed on the upper surface of the tab stacked portion 22. The size of the step formed to correspond to the upper surface of the separator stacked portion 21 and the tab stacked portion 22 in the first upper pressing portion 110 and the second upper pressing portion 120 is the separator stacked portion 21. And it can be formed to be the same as the difference in thickness formed on the upper surface of the tab stacked portion 22. In this case, the separator stack 21 and the tab stack 22 may be pressurized with the same pressure.

The size of the step formed to correspond to the upper surface of the separator stacked portion 21 and the tab stacked portion 22 in the first upper pressing portion 110 and the second upper pressing portion 120 is the separator stacked portion 21. And it may be formed differently from the difference in thickness formed on the upper surface of the tab laminated portion 22. In this case, by applying different pressures to the separator stack 21 and the tab stack 22, the physical properties, thickness, or material of the separator stack 21 and the tab stack 22 are adjusted into consideration. can do.

In one embodiment of the present invention, the first upper pressing part 110 and the second upper pressing part 120 are formed to correspond to the upper surfaces of the separator stacked part 21 and the tab stacked part 22. The size of the step may be smaller than the difference in thickness formed on the upper surfaces of the separator stacked portion 21 and the tab stacked portion 22.

In this case, at the moment the second upper pressing part 120 and the tab stacked part 22 come into contact, the first upper pressing part 110 is spaced apart from the separator stacked part 21. As the pressure is further increased, the first upper pressing part 110 comes into contact with the separator stacked part 21, so that both the first upper pressing part 110 and the second upper pressing part 120 are connected to the separator stacked part 21 and the tab stacked part. At the point of contact with (22), the second upper pressing part 120 presses the tab stacked part 22 to be more compressed than the first upper pressing part 110 presses the separator stacked part 21. do. Accordingly, the tab stack 22 can be compressed more than the separator stack 21.

At this time, the tab stack 22 includes a positive electrode plate (P) or a negative electrode plate (N), and a separator (S) that has a higher thermal contraction rate than the positive electrode plate (P) and the negative electrode plate (N) due to material characteristics. ) or due to the difference in thermal contraction rate between the negative electrode plate (N) and the separator (S), friction also occurs in the area where the positive plate (P) or negative electrode plate (N) and the separator (S) are in contact with each other inside the tab stack 22. Therefore, when the tab stacked portion 22 is pressed with a greater pressure than the separator stacked portion 21, the effect of preventing shrinkage of the separator S is further increased. Therefore, it is better to make the step formed in the pressing jig device smaller than the step formed in the electrode assembly 2 so that the compression rate at which the tab lamination portion 22 is compressed is greater than the compression rate at which the separator lamination portion 21 is compressed. desirable.

In addition, the size of the step formed to correspond to the lower surface of the separator stacked portion 21 and the tab stacked portion 22 in the first lower pressing portion 210 and the second lower pressing portion 220 is such that the first upper portion is Similar to the size of the step formed to correspond to the upper surface of the separator stacked part 21 and the tab stacked part 22 in the press part 110 and the second upper press part 120, the separator stacked part 21 and the tab stacked part 22 It may be formed the same or different from the size of the step on the lower surface of the portion 22, but it is preferably formed smaller, and description of overlapping content will be omitted.

Meanwhile, the size of the step formed to correspond to the upper surface of the separator stacked portion 21 and the tab stacked portion 22 in the first upper pressing portion 110 and the second upper pressing portion 120 and the first lower pressing portion The sizes of the steps formed to correspond to the lower surfaces of the separator stacked portion 21 and the tab stacked portion 22 in 210 and the second lower pressing portion 220 are irrelevant even if they are formed differently.

However, in order to effectively prevent shrinkage of the separator (S), the upper surfaces of the separator stacked portion 21 and the tab stacked portion 22 in the first upper pressing portion 110 and the second upper pressing portion 120 The size of the step formed to correspond is smaller than the size of the step on the upper surface of the separator stacked portion 21 and the tab stacked portion 22, and the separator stacked in the first lower press portion 210 and the second lower press portion 220. The size of the step formed to correspond to the lower surface of the portion 21 and the tab stacked portion 22 is preferably formed to be smaller than the size of the step between the lower surfaces of the separator stacked portion 21 and the tab stacked portion 22. .

Thickness of the separator layered portion (21) (mm) Thickness of tab lamination section 22 (mm) Thickness difference (mm) (c') on one side of the separator stacked portion 21 and the tab stacked portion 22 Step difference (mm) (c) corresponding to the thickness difference on one side of the separator stacked portion 21 and the tab stacked portion 22 compressibility(%)
(1-C/C') Separator (S) shrinkage rate (%) Comparative example 0.440 1.000 0.280 0.280 0 8.5 Example 1 0.440 1.000 0.280 0.265 5 7.9 Example 2 0.440 1.000 0.280 0.250 10 5.0 Example 3 0.440 1.000 0.280 0.235 15 5.0

[Table 1] above is the result of an experiment measuring the area change rate of the separator (S) compared to the initial area after the electrode assembly (2) was left in a temperature environment of 130 degrees for 1 hour, and is shown in Figures 7 and 8.

As shown in FIG. 8, the electrode assembly 2 used in the above experiment has a thickness difference between the separator stacked portion 21 and the tab stacked portion 22 formed on both the upper and lower surfaces, but on the upper surface. It was assumed that the difference in thickness between the separator (S) 21 and the tab lamination 22 formed and the difference in the thickness of the separator lamination 21 and the tab lamination 22 formed on the lower surface were the same. .

At this time, the difference in thickness formed on the upper or lower surface, that is, on one side, of the separator stacked portion 21 and the tab stacked portion 22 was defined as C'. And, as shown in FIG. 7, the separator stacked part in the first upper press part 110 and the second upper press part 120, or the second lower press part 210 and the second lower press part 220. (21) and the step formed to correspond to the difference in thickness (C') formed on one side of the tab laminated portion 22 was defined as C.

In [Table 1] above, the lamination thickness of the separator stack 21 is the sum of the thicknesses of the separator S extending to one or both ends of the electrode assembly 2. That is, it is equal to the product of the thickness of the single separator (S) and the number of stacks of the separator (S). And, the laminated thickness of the tab laminated portion 22 is the sum of the thicknesses of the tab portion (T) extending to one or both ends of the electrode assembly 2 and the separator (S) laminated portion 21. That is, the sum of the product of the thickness of one positive plate (P) or negative plate (N) and the number of layers of the positive plate (P) or negative plate (N) and the product of the thickness of a single separator (S) and the number of layers of the separator (S), and same.

In [Table 1] above, the compression ratio is calculated by the pressure jig device according to an embodiment of the present invention disposed on the electrode assembly 2, so that the first upper pressure part and the second upper pressure part are the separator stacked part 21 and the tab stacked part. This refers to the degree to which the separator stacked part 21 or the tab stacked part 22 is compressed when all parts 22 are contacted, and satisfies 1-c/c'.

The comparative example in [Table 1] above is the experimental result when the value of c and the value of c' were set to be the same. In the comparative example, since 1-c/c' is 0, the compression rate is 0%, which means that the pressurizing jig device pressurized the separator stacked portion 21 and the tab stacked portion 22 with the same pressure. At this time, the shrinkage rate of the separator (S) was 8.5%.

Experimental Example 1 is the experimental result when c is made smaller than c' and the compression ratio is 5%. In this case, the shrinkage rate of the separator (S) is 7.9%, and it can be seen that the shrinkage rate of the separator (S) is smaller than that of the comparative example.

Example 2 is the result of an experiment when the compression ratio was formed to be 10%. In this case, the shrinkage rate of the separator (S) is 5.0%, and it can be seen that the shrinkage rate of the separator (S) is smaller than that of Example 1.

Example 3 is the result of an experiment when the compression ratio was formed to be 15%. In this case, the shrinkage rate of the separator (S) is 5.0%, and it can be seen that the effect of delaying the shrinkage of the separator (S) is equivalent to that of Example 2.

As shown in the experimental results in [Table 1] above, the pressurizing jig device according to an embodiment of the present invention divides the step C formed in the pressurizing jig 1 into the step C' formed in the electrode assembly 2. Compared to when formed in the same way as, the step C formed in the pressing jig 1 is made smaller than the step C' formed in the electrode assembly 2, so that the pressure applied to the tab stack 22 is applied to the separator. It can be seen that the effect of delaying the shrinkage of the separator (S) is excellent when the compression ratio is made larger than that of the laminated section (21). That is, when the compression ratio is 10% or more, a delay in shrinkage effect of the separator (S) can be expected, so it is preferable that the compression ratio is 10% or more.

On the other hand, if the compression rate is too high, fracture may occur in the separator stacked portion 21 or the tab stacked portion 22. Therefore, it is desirable in terms of safety of the electrode assembly 2 to lower the shrinkage rate of the separator S while lowering the compressive rate. Therefore, a preferable compression ratio range of 10% to 15% is a compression ratio that can prevent fracture of the separator stack 21 or the tab stack 22 while achieving the effect of preventing shrinkage of the separator S.

Figure 13 is a cross-sectional view showing a predetermined roughness treatment on the mating surface of the electrode assembly 2 in the pressurizing jig of the pressurizing jig device according to an embodiment of the present invention, and Figures 14 and 15 are pressurization according to an embodiment of the present invention. This is a cross-sectional view showing the uneven shape applied to the mating surface of the electrode assembly (2) in the pressurizing jig of the jig device.

As shown in FIG. 13, the pressurizing jig device according to an embodiment of the present invention has a predetermined roughness ( R) can be formed.

The roughness (R) provides a large frictional force to the surface in contact with the pressing jig 1, the separator stacked portion 21, and the tab stacked portion 22, and can further prevent the separator S from shrinking, wherein, The physical unit of surface roughness (R) can be centerline average roughness (Ra).

That is, on the surface in contact with the separator stacked portion 21 and the tab stacked portion 22 in the upper pressing portion 100 and the lower pressing portion 200, a predetermined surface roughness R is formed to generate sufficient friction. You can.

In addition, the surface roughness (R) may be formed differently between the upper press part 100 and the lower press part 200, and between the first upper press part 110 and the second upper press part 120. The first lower pressing part 210 and the second lower pressing part 220 may also be formed differently.

That is, the surface roughness (R) is measured by the upper pressing unit 100, the lower pressing unit 200, the first upper pressing unit 110, the second upper pressing unit 120, the first lower pressing unit 210, and the first lower pressing unit 210. By forming each of the two lower pressure parts 220 differently, different friction forces can be formed in consideration of the materials and physical properties of the separator stacked part 21 and the tab stacked part 22.

In addition, in the pressurizing jig device according to an embodiment of the present invention, the pressurizing jig (1) includes an upper pressurizing portion (100) in contact with the separator stacked portion (21) and the tab stacked portion (22) in order to further amplify the friction force. The surface of the lower pressing portion 200 may further include adhesive, adhesive tape, or a friction member made of rubber.

As shown in Figures 14 and 15, in the pressing jig device according to an embodiment of the present invention, the pressing jig (1) has the upper pressing part 100 and the lower pressing part 200 facing each other. It may further include uneven portions that protrude at predetermined intervals.

The uneven portions may be selectively formed in the upper pressing portion 100 or the lower pressing portion 200 at predetermined intervals and of a predetermined size. The uneven portion expands the contact area between the upper pressing portion 100 and the lower pressing portion 200 and the separator stacked portion 21 and the tab stacked portion 22, thereby forming the separator stacked portion 21 and the tab stacked portion 22. ) can provide greater friction.

Although the present invention has been described in detail through specific examples, this is for the purpose of explaining the present invention in detail, and the pressurizing jig device according to the present invention is not limited thereto, and common knowledge in the field within the technical spirit of the present invention It would be clear that modification or improvement is possible by those who have it. All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Pressing jig device 11: First pressurizing part
12: second pressurizing part 100: upper pressurizing part
110: first upper pressing part 120: second upper pressing part
130: Upper pressurized fixed connection 200: Lower pressurized part
210: first lower pressing part 220: second lower pressing part
230: Lower pressure fixing connection 2: Electrode assembly
21: Separator stack 22: Tab stack
C: Height of the step on one surface of the first pressing part and the second pressing part
C': Difference in thickness on one side of the separator layer and the tab layer
P: positive plate N: negative plate
S Separator T: Tab portion
L: Lead part R: Roughness

Claims (12)

An electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator are alternately stacked between the positive and negative electrode plates, and the separator is positioned at the outermost portion; and
A tab portion where the positive electrode plate or the negative electrode plate extends from one or both ends of the electrode assembly and is coupled to a lead portion.
The separator is
A secondary battery extending in the direction in which the tab portion is formed in the electrode assembly. In claim 1,
A separator stack formed by stacking the plurality of extended separators; and
It further includes a tab stack formed by alternately stacking the extended positive or negative electrode plate and the extended separator,
A secondary battery, wherein the tab stacked part is formed between the separator stacked parts. In claim 2,
A secondary battery in which the separator stack and the tab stack are pressurized by a pressurizing jig device. A positive electrode plate, a negative electrode plate, and a separator are alternately stacked between the positive and negative electrode plates, and the outermost separator is attached to one or both ends perpendicular to the stacking direction of an electrode assembly formed to surround the stacking direction,
A separator stack extending in the direction in which the tab portion formed by stacking the positive or negative electrode plates extending to one or both ends of the electrode assembly is formed, and
A pressing jig formed to press together the tab stacking portion formed by alternately stacking the positive or negative electrode plate extending to one or both ends of the electrode assembly to form the tab portion and the separator extending in the direction in which the tab portion is formed. Including, a pressurizing jig device. In claim 4,
The pressurizing jig is,
a first pressing part that presses the tab stacking part; And a second pressurizing unit that pressurizes the separator stack.
A pressing jig device wherein the first pressing part and the second pressing part are formed to be stepped to correspond to a thickness difference between the separator stacked part and the tab stacked part pressed by the pressing jig. In claim 4,
The pressurizing jig is,
An upper pressure portion formed on the separator stack and the tab stack; and
It includes a lower pressing part formed below the separator stacked part and the tab stacked part to face the upper pressing part,
The upper press part and the lower press part each include a pressure fixing connection at both ends,
A pressurizing jig device wherein the pressurizing and fixing connection portion causes the upper pressurizing portion and the lower pressing portion to pressurize the separator stacked portion and the tab stacked portion with a predetermined pressure. In claim 6,
The pressurized fixed connection,
an upper pressure fixing connection formed at both ends of the upper pressure part and having fixing parts extending in a downward direction;
A pressurizing jig device comprising: a lower pressurizing fixing connection portion formed at both ends of the lower pressurizing portion and extending upward to be coupled to the fixing portion and including an insertion portion provided with an adjusting portion for adjusting the coupling position. In claim 7,
The fixing part has an inclined section formed on at least one side,
The adjusting part is formed to bend only downward due to the inclined section, and accommodates the fixing part in stages, so that the separation distance between the upper pressing part and the lower pressing part is adjusted in stages. A pressurizing jig device that allows the lower pressurizing part to be combined. In claim 6,
The upper pressurizing part,
A first upper pressurizing part that pressurizes the separator stacked part, and
It includes a second upper pressing part that presses the tab stacking part,
The lower pressurizing part,
A first lower pressurizing part that pressurizes the separator stacked part, and
It includes a second lower pressing part that presses the tab stacking part,
The first upper pressing part and the second upper pressing part are formed to be stepped to correspond to the thickness difference formed on the upper surface of the separator stacked part and the tab stacked part pressed by the upper pressing part,
A pressing jig device wherein the first lower pressing part and the second lower pressing part are formed to be stepped to correspond to a thickness difference formed on the lower surface of the separator stacked part and the tab stacked part pressed by the lower pressing part. In claim 9,
The size of the step formed in the first upper pressing part and the second upper pressing part is smaller than the thickness difference between the upper surfaces of the separator stacked part and the tab stacked part pressed by the upper pressing part,
A pressurizing jig device, wherein a step formed in the first lower pressing part and the second lower pressing part is smaller than a thickness difference on the lower surfaces of the separator stacked part and the tab stacked part pressed by the lower pressing part. In claim 6,
The upper pressing part and the lower pressing part,
A pressurizing jig device in which a predetermined surface roughness is formed to generate frictional force on a surface in contact with the separator stacked portion and the tab stacked portion pressed by the pressurizing jig. In claim 6,
The upper pressing part and the lower pressing part,
A pressurizing jig device in which concavo-convex portions facing each other and protruding at predetermined intervals are alternately formed on a surface in contact with the tab lamination portion and the separator lamination portion.