KR20240044781A - Formation jig of secondary battery and formation method using the same - Google Patents

Abstract

The formation jig according to the present invention includes a plurality of press plates installed side by side, coupled to each other to enable compact adjustment, and configured to have a secondary battery interposed in a gap formed between each press plate; and a pressing auxiliary member interposed between the pressing plate and the secondary battery and having a protrusion protruding by a length of a in the thickness direction (z-axis direction) on a plane.

Description

Formation jig of secondary battery and formation method using the same {Formation jig of secondary battery and formation method using the same}

The present invention relates to a formation jig for a secondary battery and a formation method using the same. More specifically, it relates to a formation jig for preventing precipitation of lithium in the sliding area of the positive or negative electrode of a secondary battery and a formation method using the same.

Secondary batteries refer to batteries that can be reused repeatedly through charging and discharging. These secondary batteries are widely used in advanced electronic devices such as smartphones, laptops, and even electric vehicles. In particular, lithium secondary batteries have become more popular in recent years because they have a higher energy density per unit weight and enable rapid charging compared to other secondary batteries such as existing lead acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. It is being widely used.

Secondary batteries can be classified into prismatic, pouch-shaped, and cylindrical secondary batteries depending on the shape and material of the battery case. Pouch-type secondary batteries are inside the battery case of a laminate sheet with an inner layer/barrier layer/outer layer structure, and the anode/ It is a secondary battery in which an electrode assembly including a separator/cathode is stored in an electrolyte solution.

These secondary batteries cannot be used immediately after assembly, and can only be shipped after going through a process of activating the electrolyte and electrodes to cause an electrochemical reaction. This activation process includes a pre-aging process in which the electrolyte of the assembled secondary battery impregnates the electrode assembly, a formation process in which the secondary battery is charged to a predetermined charging depth, an aging process in which the secondary battery is aged under predetermined temperature conditions, and the secondary battery It may include a process of fully discharging and fully charging.

In addition, the formation process may include a process of performing charging while pressurizing the secondary battery, which is called jig formation. For this jig formation, a formation jig, which is a pressurizing means as shown in FIG. 3, is used. Available.

Meanwhile, referring to FIG. 1, the positive electrode 10 and the negative electrode 20 constituting the electrode assembly of the secondary battery gradually decrease in thickness of the positive electrode mixture layer 12 and the negative electrode mixture layer 22, resulting in a current collector. It may include a sliding part (S, S') forming an inclined surface with respect to the plane of (11, 21), and in this sliding part, the anode and the cathode are not in close contact but are spaced apart, as shown in FIG. .

In areas where the anode and the cathode are spaced apart, this separation acts as a resistance to the movement of lithium ions, so it may cause precipitation of lithium ions in the sliding area. Therefore, when manufacturing secondary batteries, there is a need to develop technology that can solve these problems.

Republic of Korea Patent Publication No. 10-2021-0051281

The present invention is intended to solve the above technical problem, and seeks to provide a formation jig and a formation method for suppressing lithium precipitation at that site when a sliding part is present on the anode or cathode included in the electrode assembly.

The formation jig according to an embodiment of the present invention includes a plurality of pressure plates installed side by side, coupled to each other to enable compactness adjustment, and configured to have a secondary battery interposed in a gap formed between each press plate; and a pressing auxiliary member interposed between the pressing plate and the secondary battery and having a protrusion protruding by a length of a in the thickness direction (z-axis direction) on a plane.

In one embodiment of the present invention, the secondary battery may be a pouch-type secondary battery in which an electrode assembly including an anode/separator/cathode is stored inside a pouch-type battery case.

In one embodiment of the present invention, the pressing auxiliary member may include a pair of protrusions.

In one embodiment of the present invention, the protrusions may be provided on both edges of the pressing auxiliary member.

In one embodiment of the present invention, the protrusion may be bar-shaped, have a predetermined width direction length (b), and may be extended along the longitudinal direction on the plane of the pressing auxiliary member.

In one embodiment of the present invention, the pressing auxiliary member may be integrated with the protrusion.

In one embodiment of the present invention, the height (a) of the protrusion is calculated by subtracting the sum of the thicknesses of the anode and the cathode at both edge portions of the secondary battery from the sum of the thicknesses of the anode and the cathode at the center of the secondary battery. It can be set according to the thickness difference.

In one embodiment of the present invention, the width direction length (b) of the protrusion may be set according to the length of the sliding portion of the cathode or anode.

A formation jig according to an embodiment of the present invention includes a support member installed for support; A movable member installed to face the support member; a guide member that guides the pressure plate to move in the direction of the spacing adjustment; And it may further include a pressure driving unit that presses and releases pressure from both sides of the secondary battery between the pressure plates by moving the movable member back and forth.

The secondary battery formation method according to the present invention includes the process of pressurizing the secondary battery using a formation jig.

In the formation jig according to the present invention, the pressurizing auxiliary member provided with the protrusion effectively pressurizes the relatively thin electrode sliding portion, allowing the anode and cathode to come into close contact with each other. Therefore, even when charging and discharging are repeated under rapid charging conditions, the possibility of generating by-products or precipitating lithium at the sliding area can be significantly reduced.

1 is a cross-sectional view of an electrode assembly stored inside a secondary battery of the present invention.
Figure 2 is a conceptual diagram to explain the problems of the prior art.
Figure 3 is a perspective view of a pressure plate according to an embodiment of the present invention.
Figure 4 is a front view of a pressing auxiliary member according to an embodiment of the present invention.
Figure 5 is a side schematic diagram of a formation jig according to an embodiment of the present invention.
Figure 6 is a schematic diagram of the upper part of a formation jig according to an embodiment of the present invention.
Figure 7 is a conceptual diagram for explaining the effect of the pressing auxiliary member according to the present invention.
Figure 8 is a schematic diagram of a pressing auxiliary member according to another embodiment of the present invention.

Since the present invention can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” another part, this includes not only being “directly above” the other part, but also cases where there is another part in between. Conversely, when a part of a layer, membrane, region, plate, etc. is said to be "under" another part, this includes not only being "right underneath" that other part, but also cases where there is another part in between. Additionally, in this application, being placed “on” may include being placed not only at the top but also at the bottom.

In the present invention, the sliding portion refers to the area around the boundary between the electrode mixture uncoated portion where the electrode mixture layer (anode mixture layer and cathode mixture layer) is not applied and the electrode mixture applied portion where the electrode mixture is applied, as it approaches the electrode mixture uncoated portion. This refers to an area where the thickness of the electrode mixture layer gradually decreases and an inclined surface is formed with respect to the current collector plane. In other words, the concept includes the area where the flatness of the electrode mixture layer is reduced and the surrounding area.

In the present invention, the x-axis corresponds to the horizontal direction of the secondary battery and the horizontal direction in the plane of the pressing auxiliary member, the y-axis corresponds to the longitudinal direction of the secondary battery and the vertical direction in the plane of the pressing auxiliary member, and the z-axis corresponds to the spacing adjustment of the pressing plate. Direction, corresponds to the thickness direction of the secondary battery.

Hereinafter, the formation jig for the secondary battery of the present invention will be described.

The formation jig according to the present invention is used in the activation process of a pouch-type lithium secondary battery. The pouch-type lithium secondary battery is a secondary battery in which an electrode assembly is stored together with an electrolyte inside a pouch-type battery case.

The electrode assembly may be a stacked electrode assembly in which basic units of anode/separator/cathode are sequentially stacked, or a stack-folded electrode assembly in which the basic units are folded using a long length of continuous folded separator sheet. You can.

Figure 1 is a schematic diagram of basic units constituting an electrode assembly stored inside a battery case of a secondary battery. Referring to Figure 1, the basic unit has a structure in which an anode 10, a separator 30, and a cathode 20 are sequentially stacked.

The positive electrode 10 may have a positive electrode mixture layer 12 containing a positive electrode active material applied to both sides of the positive electrode current collector 11, and the negative electrode 20 may have a negative electrode active material applied to both sides of the negative electrode current collector 21. A negative electrode mixture layer 22 containing may be applied.

Both end portions of the positive electrode and the negative electrode include sliding portions S and S' in which the thickness of the positive electrode mixture layer and the negative electrode mixture layer gradually decreases to form an inclined surface with respect to the plane of the current collector. This sliding part is a phenomenon that appears as the fluid-type electrode slurry has fluidity.

Referring to FIG. 2, in the area B where the anode 10 and the cathode 20 including the sliding parts S and S' face each other, compared to the area A not including the sliding part, It can be seen that the distance between the anode 10 and the cathode 20 is relatively long. That is, in the sliding portions (S, S') of the anode or cathode, the separation distance between the anode and cathode becomes longer, which acts as a resistance to the movement of lithium ions and is especially vulnerable under fast charging and high voltage conditions. Therefore, when a secondary battery is charged and discharged under these vulnerable conditions, by-products or precipitation of lithium metal may occur in the sliding portion as the charge and discharge cycle progresses, which deteriorates the lifespan characteristics of the battery.

As a result of repeated research to solve the above-described problem, the inventors of the present invention found that, in the formation process used to activate the secondary battery, the sliding portion of the anode/cathode is pressed under high temperature conditions using a pressurizing auxiliary member provided with a protrusion. Thus, it was discovered that by-product generation or lithium precipitation could be suppressed by bringing the sliding portion of the anode and the sliding portion of the cathode into close contact with each other despite repeated charging and discharging under high-speed charging or high-voltage conditions, leading to the present invention.

Figure 3 is a perspective view of a pressure plate according to an embodiment of the present invention, Figure 4 is a front view of a pressure auxiliary member according to an embodiment of the present invention, and Figure 5 is a side view of a formation jig according to an embodiment of the present invention. It is a schematic diagram, and Figure 6 is a schematic diagram of the upper part of the formation jig according to an embodiment of the present invention, and Figure 7 is an enlarged view of a part of Figure 6.

Referring to these drawings, a plurality of formation jigs 100 according to an embodiment of the present invention are installed in parallel, are coupled to each other to enable compact adjustment, and are secondary to a gap formed between each. A pressure plate 110 configured to have the cell 1 interposed therebetween; and a pressing auxiliary member 120 disposed between the pressing plate 110 and the secondary battery 1 and having a protrusion 121 that protrudes by a length of a in the thickness direction (z-axis direction) on the plane. Includes.

The formation jig 100 according to the present invention interposes the pressing auxiliary member 120 having the protrusion 121 between the secondary battery 1 and the pressing plate 110, so that the pressing plate 110 is used to press the secondary battery 110. In the process of pressurizing the battery 1, the pressing auxiliary member 120 effectively pressurizes the relatively thin electrode sliding part, so that the positive electrode sliding part and the negative electrode sliding part facing it come into close contact with each other. Therefore, since the separation distance between the positive and negative electrodes in the sliding portion is not long, the possibility of generating by-products or precipitating lithium can be significantly reduced even when charging and discharging are repeated under rapid charging conditions.

Referring to FIGS. 3 to 5, the pressing auxiliary member 120 may be in the shape of a rectangular plate, and the length L1 in the horizontal direction (x-axis direction) of the pressing auxiliary member 120 is the secondary battery 1 ) may be equal to or slightly larger than the length (L2) in the horizontal direction (x-axis direction).

A pair of protrusions 121 protruding toward the secondary battery are provided on both edges of the pressing auxiliary member in the horizontal direction (x-axis direction). Since the positive electrode sliding part or the negative electrode sliding part is located on both edges in the horizontal direction (x-axis direction) of the secondary battery, protrusions for selectively pressing the sliding part may be provided on both horizontal edges of the pressing auxiliary member.

Since the thickness of the electrode mixture layer of each sliding part of the anode/cathode is relatively thin, in order to pressurize the sliding part, it must be pressed with a pressure member having a step. Since the protrusion 210 of the present invention protrudes from the plane of the pressing auxiliary member 120 toward the secondary battery 1 by a predetermined length, it can pressurize a sliding portion that is relatively thin.

The protrusion 121 has a bar shape. Referring to FIGS. 4 to 6, the protruding portion 121 has a height (a) extending protruding toward the secondary battery, a horizontal length (b) in a plane, and a vertical length (c) in a plane. ) can have. That is, the protrusion may have a predetermined length b in the width direction and may be extended along the longitudinal direction on the plane of the pressing auxiliary member.

The height (a) of the protrusion 121 is set according to the thickness difference obtained by subtracting the total thickness of the positive electrode and negative electrode at both edge areas of the secondary battery from the total thickness of the positive electrode and negative electrode at the center of the secondary battery. It can be. Both edges of the secondary battery are areas where the positive or negative electrode includes a sliding part, and the protrusion must press the sliding part. Therefore, in the total thickness of the positive and negative electrodes in the center of the secondary battery, the area at both edges of the secondary battery is It must protrude by the length of the difference in thickness minus the total thickness of the anode and cathode.

The total thickness of the positive electrode and negative electrode at both edge portions of the secondary battery may mean the sum of the thickness of the positive electrode mixture layer of the positive electrode sliding portion and the thickness of the negative electrode mixture layer of the negative electrode sliding portion. At this time, the thickness of the anode mixture layer of the anode sliding part and the thickness of the cathode mixture layer of the cathode sliding part gradually decrease along the extension direction (x-axis direction) of the sliding part and are not constant, so the thickness of the anode mixture layer of the cathode sliding part is not constant. The thickness of the electrode mixture layer at the midpoint can be used as a reference.

And, the horizontal length (b) of the protrusion 121 on a plane may be set according to the length of the sliding part of the cathode or the length of the sliding part of the anode. Here, the length of the sliding portion is the length in the transverse direction (x-axis direction) from the point where the thickness of the electrode mixture layer begins to become thin in the anode sliding portion or the cathode sliding portion to the point where the electrode mixture layer ends. .

If the length of the sliding part is long, the length (b) of the protrusion in the transverse direction on the plane must be correspondingly longer, and conversely, if the length of the sliding part is short, the length (b) of the protrusion in the transverse direction on the plane must also be shortened. will be.

Additionally, the planar vertical length (c) of the protrusion 121 may be 100% to 110% of the planar vertical length of the cathode. Since the protrusion must press the front surface of the sliding part, it is preferable that the longitudinal length of the protrusion is longer than the vertical length of the cathode.

And, in setting the vertical length of the protrusion, the size of the negative electrode is used as a standard. Usually, when designing a secondary battery, the negative electrode is cut larger than the positive electrode in order to make the NP Ratio value greater than 1, so the size of the negative electrode is This is because if the vertical length of the protrusion is set as a standard, not only the cathode sliding part but also the entire anode sliding part can be pressed.

In one specific example, the pressing auxiliary member 120 may be integrated with the protrusion 121. When the pressure auxiliary member is integrated with the protrusion, the usable life can be extended compared to the case where the protrusion is formed by attaching an adhesive tape on a flat pressure auxiliary member.

The formation process is performed under high temperature/high pressure conditions. Typically, adhesive tapes can wear out under high temperature/high pressure conditions, and the level difference between protrusions may decrease with continuous use. Therefore, in order to improve the useful life of the pressure auxiliary member, it is desirable that the material of the pressure auxiliary member integrated with the protrusion is plastic with excellent heat resistance and wear resistance. Specific examples of such plastics include polypropylene, polyethylene terephthalate (PET), and the like.

When manufacturing a pressing auxiliary member integrated with a protrusion, the height (a) and horizontal length (b) of the protrusion can be set to appropriate values by simulating the sliding level of the sliding part in advance. Differences in sliding level occur depending on the viscosity of the electrode slurry and the width and type of the coating shim included in the coater, which is equipment for coating the electrode slurry. Therefore, it is desirable to determine the size of the protrusion according to the above conditions. It is desirable to manufacture an integrated pressing auxiliary member by setting appropriate heights (a) and transverse lengths (b) of the protrusions according to various sliding levels.

Figure 3 is a diagram omitting the pressing auxiliary member in the formation jig according to an embodiment of the present invention. Referring to FIG. 2, a plurality of secondary battery formation jigs 100 according to an embodiment of the present invention are installed in parallel, are coupled to each other to enable compact adjustment, and have a gap formed between each. ) a pressure plate 110 configured to interpose the secondary battery 1; A support member 130 installed for support; A movable member 140 installed to face the support member 130; A guide member 150 that guides the pressure plate 110 to move in the direction of the spacing adjustment; And it may include a pressure driver 160 that presses and releases the pressure on both sides of the secondary battery 10 between the pressure plate 110 by moving the movable member 140 back and forth.

The pressing plate 110 is for pressurizing the secondary battery 1, and is arranged vertically in parallel between the support member 130 and the movable member 140 so as to pressurize a plurality of secondary batteries at the same time. They are installed and coupled so that the gap between them can be adjusted by moving the movable member 140 back and forth, and a secondary battery is inserted into the gap formed between them.

The pressure plate 110 may be configured to be movable in the direction of spacing adjustment (z-axis direction) by a guide member 150, which will be described later, in order to apply pressure to the secondary battery during the formation process, and the pressure plate 110 ) may be provided with a sliding coupling portion (not shown) through which the guide member 160 can slide.

The formation jig 100 of the present invention is equipped with a pressure plate 110, as shown in FIG. 5, so that when the pressure plate 110 pressurizes the secondary battery, the anode sliding part or the cathode sliding part can be simultaneously pressed. It may be configured to interpose the pressing auxiliary member 120 having the protrusion 121 between the secondary batteries 1 .

Figure 5 shows an embodiment configured to insert a plurality of press auxiliary members 120 between the press plate 110 and the secondary battery 1, but the present invention is not limited thereto.

Referring to Figure 8, in another embodiment of the present invention, the pressing auxiliary member 220- may be in the form of a thin film sheet extending long in the z-axis direction. In this case, the pressing auxiliary member 220 is positioned along the y-axis. Based on the direction, when the secondary battery is placed between the secondary battery 1 and the pressure plate 210 and the secondary battery is inserted between each of the pressure plates, the secondary battery and the pressure auxiliary member 220 are pressed together into the pressure plates. This type of pressure auxiliary member has the effect of being able to be easily inserted between the secondary battery and the pressure plate.

The support member 130 is installed for support. For example, it may be installed perpendicular to the frame 170 installed on the ground, or as another example, it may be installed to be elastically supported by an elastic support member.

The movable member 140 is installed to face the support member 130 and moves back and forth by the pressure drive unit 160 to press and release the pressure plate 110.

The guide member 150 guides the plurality of pressure plates 110 to move in the direction of spacing adjustment. To this end, one end of the support member 130 is positioned in the arrangement direction (z-axis direction) of the pressure plates. In this case, the other end may be made of an axis member fixed to the movable member 140, and a plurality of them may be provided side by side.

The pressing drive unit 160 moves the movable member 140 back and forth to pressurize and depressurize the secondary battery between the pressurizing plates from both sides. For this purpose, the reciprocating motion of the cylinder is used or the rotational force of the motor is used for linear motion. It can be configured in various ways, including being configured to convert to .

Meanwhile, the secondary battery formation method according to the present invention includes the process of forming the secondary battery using the formation jig 100.

The formation process is a process of activating the secondary battery by charging and discharging the secondary battery. The formation process of the present invention can be performed with a predetermined pressure applied, and involves pressurizing the battery before charging and discharging the secondary battery. It may also include processes.

In a specific embodiment of the present invention, the charging may be performed in the range of 30% to 100%, 50% to 100%, or 80% to 100% of the battery capacity (SOC), and the discharge may be performed The battery can be discharged from 50% to 0% of its capacity, or from 30% to 0%. The charging and discharging can be performed in CC/CV (constant current/constant voltage) mode for charging and in constant current (CC) mode based on 0.1C-rate. However, the charging/discharging depth, charging/discharging speed, and charging/discharging mode during charging/discharging are not limited to the above methods, and can be set to an appropriate range or condition in consideration of electrode active material, battery type, battery characteristics, etc.

The pressure applied during the formation process can be controlled to 1kgf/cm2 to 3kgf/cm2. Additionally, the first pressurizing step may be performed in a temperature range of about 30°C to 70°C. For example, the temperature can be adjusted to 50°C or higher. Preferably, the pressurization conditions and temperature conditions are maintained for less than 1 hour, preferably less than 30 minutes.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are for illustrative purposes only and do not limit the scope of the present invention.

Example

Considering the respective sliding lengths of the positive and negative sliding parts, the total of the positive and negative electrode thicknesses in the center of the secondary battery, and the total of the positive and negative electrode thicknesses in the sliding area, the height (a) of the protrusion for pressing the sliding part and The horizontal length (b) was set. After manufacturing an integrated pressing auxiliary member having protrusions having the set size on both edges in the horizontal direction, the pressing auxiliary member is pressed by a formation jig so that the protrusions of the pressing auxiliary member protrude toward the secondary battery. It was inserted between the plate and the secondary battery.

In this state, a formation process (temperature: 70°C) was performed in which a plurality of pressurizing plates were moved in the direction of spacing adjustment and the secondary battery was charged to SOC 60% while being pressurized. After formation, high-temperature aging was performed by leaving the secondary battery at a temperature of 60°C for 12 hours, and room temperature aging was performed by leaving the secondary battery at a temperature of 23°C for 36 hours. Afterwards, the secondary battery was discharged until the SOC reached 0%, and the secondary battery was activated by fully charging and discharging.

Comparative example

In the above example, during the formation process, the secondary battery was activated in the same manner as in the example, except that the pressing auxiliary member was not used.

Experimental example: Observation of lithium precipitation

The secondary battery activated according to the above examples and comparative examples was repeatedly charged and discharged for 350 cycles under 2-step rapid charge and discharge conditions, and then the battery was disassembled to observe whether lithium was precipitated. The results are shown in Table 1. indicated. If lithium precipitated, it was written as “O”, and if lithium did not precipitate, it was written as “X”.

<Rapid charge/discharge conditions>

From 1 to 150 cycles, charge to 4.2V at 2C-rate, perform constant current/constant voltage charging with 1C-rate cut off, and discharge to 3.0V at 0.5C-rate, but consider this as one cycle and perform 150 cycles. This was repeated.

In cycles 151 to 350, charge to 4.4V at 1C-rate, perform constant current/constant voltage charging with 0.05C-rate cut off, and discharge to 3.0V at 0.5C-rate, but consider this as one cycle and cycle 200 times. was repeated.

Whether lithium is precipitated or not Example X Comparative example O

Referring to Table 1, in the secondary battery according to the example, lithium did not precipitate after repeated charging and discharging, but in the secondary battery according to the comparative example, lithium precipitated at both edges of the negative electrode.

The formation jig and the formation method using the same according to the present invention, in the formation process for activating the secondary battery, pressurize the sliding portion together with a pressing auxiliary member having a protrusion capable of pressing the sliding portion when pressing the battery, thereby pressurizing the sliding portion. Since the positive and negative electrodes are not spaced apart and are in close contact with each other, there is an effect of preventing lithium from being deposited on the sliding part when charging and discharging cycles are repeated.

1: Secondary battery
13, 23: electrode leads
100: Formation jig
110, 210: Pressure plate
120, 220: Pressurizing auxiliary member
130: Support member
140: Movable member
150: Guide member
160: Pressure drive unit
170: frame

Claims (10)

A plurality of pressure plates are installed side by side, coupled to each other to enable compact adjustment, and configured to have a secondary battery interposed in a gap formed between each pressure plate; and
A formation jig for a secondary battery, including a pressing auxiliary member interposed between the pressing plate and the secondary battery and having a protrusion protruding by a length of a in a plane thickness direction (z-axis direction).
In claim 1,
The secondary battery is a pouch-type secondary battery in which an electrode assembly including an anode/separator/cathode is stored inside a pouch-type battery case.
In claim 1,
The pressing auxiliary member is a formation jig for a secondary battery having a pair of protrusions.
In claim 3,
The protrusions are a formation jig for a secondary battery provided on both edges of the pressing auxiliary member.
In claim 3,
The protrusion is bar-shaped, has a predetermined width direction length (b), and extends along the longitudinal direction on the plane of the pressing auxiliary member.
In claim 1,
The pressing auxiliary member is a formation jig for a secondary battery integrated with the protrusion.
In claim 1,
The height (a) of the protrusion is set according to the thickness difference obtained by subtracting the total thickness of the positive electrode and negative electrode at both edge areas of the secondary battery from the total thickness of the positive electrode and negative electrode at the center of the secondary battery. Formation jig.
In claim 5,
A formation jig for a secondary battery in which the width direction length (b) of the protrusion is set according to the length of the sliding portion of the cathode or anode.
In claim 1,
A support member installed for support;
A movable member installed to face the support member;
a guide member that guides the pressure plate to move in the direction of the spacing adjustment; and
A formation jig for a secondary battery, further comprising a pressurizing drive unit that pressurizes and depressurizes the secondary battery between the pressurizing plates from both sides by moving the movable member back and forth.
A formation method for a secondary battery comprising pressurizing the secondary battery using the secondary battery formation jig according to any one of claims 1 to 9.