Jig device for charging and discharging secondary batteries

Abstract

A jig device for charging and discharging according to an embodiment of the present invention includes a pair of pressure jigs and an auxiliary pressure member provided between opposing surfaces of the pair of pressure jigs, and the auxiliary pressure member presses a sliding region of the battery cell when the battery cell is disposed between the pair of pressure jigs.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the benefit of priority based on Korean Patent Application No. 10 - 2021 - 0140155 filed on October 20, 2021 and Korean Patent Application No. 10 - 2022 - 0134616 filed on October 19, 2022, and all the contents disclosed in the documents of the Korean patent applications are included as part of this specification.

[0002] The present invention relates to a jig device for charging and discharging a secondary battery, and more specifically, to a jig device for charging and discharging a secondary battery capable of applying uniform pressure to the body region and the sliding region of a battery cell.

Background Art

[0003] In modern society, as the use of portable devices such as mobile phones, notebook computers, video cameras, and digital cameras has become common, the development of technologies related to such mobile devices has become active. In addition, rechargeable secondary batteries are a solution for solving problems such as air pollution in existing gasoline vehicles that use fossil fuels, and are used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug - in hybrid electric vehicles (P - HEVs), etc., so the need for development of secondary batteries is increasing.

[0004] Currently commercialized secondary batteries include nickel - cadmium batteries, nickel - metal hydride batteries, nickel - zinc batteries, lithium secondary batteries, etc. Among these, lithium secondary batteries have the advantages of free charge and discharge, low self - discharge rate, and high energy density, and have received the most attention.

[0005] Lithium secondary batteries are manufactured in the order of an electrode manufacturing process for manufacturing electrodes, a manufacturing process for manufacturing an electrode assembly with the electrodes and a separator interposed therebetween, and then incorporating this into a secondary battery case together with an electrolytic solution to manufacture a secondary battery, and an activation process for putting the manufactured secondary battery on the market.

[0006] In the activation process, battery cells are mounted on a predetermined jig, and charging and discharging are performed under the conditions necessary for activation.

[0007] On the other hand, the electrode assembly built into the battery case is a rechargeable power generation element consisting of a stacked structure of positive electrode / separating membrane / negative electrode, and includes jelly-roll type electrode assemblies, stacked (laminated) electrode assemblies, and stacked / folding type electrode assemblies.

[0008] Such electrode assemblies are coated with an electrode active material slurry, manufactured in a mixing process, onto the electrode current collector via a predetermined slot die in a predetermined pattern and thickness, and then dried. However, since the electrode active material slurry is a fluid, it has the property of flowing down after coating, and this flowing down of the electrode active material slurry is called sliding. Such sliding can frequently occur at both ends in the width direction of the holding portion coated with the electrode active material.

[0009] Figure 1 shows a plan view and a cross-sectional view of the sliding area.

[0010] Figure 2 shows a battery cell, and Figure 3 shows an example of a battery cell being supplied to a charge / discharge jig.

[0011] Referring to Figure 1, the sliding region is the area where the thickness of the electrode mixture layer decreases as it moves away from the center of the holding part, and increases as it moves closer to the center of the holding part. On the other hand, as shown in Figure 1, part A, excluding the sliding region S, has a greater electrode mixture layer thickness than the sliding region S.

[0012] Referring to Figure 2, the battery cell 10 includes a body region 12 corresponding to an electrode mixture layer region (A, see Figure 1) in which separation membranes and electrodes are alternately stacked, and a sliding region 14 corresponding to a part of the sliding region (S, see Figure 1). The sliding region 14 shown in Figure 2 refers to the part of the sliding region S in which the electrode tabs are connected to the electrodes. As described above, the sliding region 14 may have a thickness slightly lower than the body region 12 due to the sliding phenomenon of the electrode active material applied during the process.

[0013] Referring to Figure 3, during the activation process, the battery cell 10 undergoes repeated charging and discharging, causing a phenomenon where a portion of the battery cell 10 swells. However, the charging and discharging jig device can limit the volume change of the battery cell during charging and discharging to a certain range by applying pressure to one side of the battery cell. However, the sliding region 14 has a smaller thickness than the body region 12, and the pressurizing surface of the jig device has a flat shape. As a result, a gap occurs between the sliding region 14 and the jig device, leading to the problem of different pressures being applied to the body region 12 and the sliding region 14.

[0014] Therefore, there is currently a need for a charging and discharging jig that can make the pressure distribution applied to the battery cells more uniform. [Overview of the Initiative] [Problems that the invention aims to solve]

[0015] The problem that this invention aims to solve is to provide a charging and discharging jig device that can uniformly pressurize battery cells.

[0016] However, the problems that the embodiments of the present invention aim to solve are not limited to those described above, and can be broadly extended within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0017] The charging and discharging jig device according to an embodiment of the present invention includes a pair of pressurizing jigs and an auxiliary pressurizing member provided between the opposing surfaces of the pair of pressurizing jigs. The auxiliary pressurizing member can pressurize the sliding region of the battery cell when the battery cell is disposed between the pair of pressurizing jigs.

[0018] The auxiliary pressurizing member can provide a step protruding from the opposing surfaces of the pair of pressurizing jigs toward the battery cell side.

[0019] The auxiliary pressurizing member can pressurize a portion where an electrode of the battery cell is connected to an electrode tab within the sliding region of the battery cell.

[0020] The auxiliary pressurizing member can pressurize a portion where an electrode is connected to an electrode tab within the tab connection portion of the battery cell.

[0021] The auxiliary pressurizing member has a tape or strip shape and is disposed parallel to one end of the pair of pressurizing jigs.

[0022] The charging and discharging jig device may further include a pressurizing pad located on at least one of the opposing surfaces of the pair of pressurizing jigs to buffer the pressure applied to the body region of the battery cell.

[0023] The auxiliary pressurizing member can be located on the pressurizing pad.

[0024] The pressurizing pads are provided in a pair and are respectively located on both opposing surfaces of the pair of pressurizing jigs. The auxiliary pressurizing members are provided in a pair and can be respectively located on both opposing surfaces of the pair of pressurizing pads.

[0025] The body region of the battery cell can be separated from the auxiliary pressurizing member.

[0026] The auxiliary pressurizing member can be located so as to cover 40% to 100% of the width of the sliding region.

[0027] The auxiliary pressing member can be positioned to cover 60% to 80% of the width of the sliding region.

[0028] The auxiliary pressing member is manufactured from a material having a higher hardness than that of the pressing pad.

[0029] The pressing pad is manufactured from silicone.

[0030] The pressing jig is manufactured from stainless steel.

[0031] A protective paper can be positioned between the auxiliary pressing member and the pressing pad.

[0032] The thickness of the auxiliary pressing member is greater than 30 μm.

[0033] The thickness of the auxiliary pressing member may be 31 μm or more.

Advantages of the Invention

[0034] According to the embodiment, the charging / discharging jig device of the present invention forms a step on the pressing surface so that the pressure applied to the battery cell can be made uniform.

[0035] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Brief Description of the Drawings

[0036] [Figure 1] It is a plan view and a cross-sectional view showing the sliding region. [Figure 2] It is a view showing a battery cell. [Figure 3] It is a view showing an example in which a battery cell is provided in the charging / discharging jig device. [Figure 4] It is a view showing the charging / discharging jig device according to an embodiment of the present invention. [Figure 5]This is a cross-sectional view along the AA cutting line in Figure 4. [Figure 6] This figure shows an example of an auxiliary pressurizing member provided in a charge / discharge jig device according to one embodiment of the present invention. [Figure 7] This figure shows an example of an auxiliary pressurizing member provided in a charge / discharge jig device according to one embodiment of the present invention. [Figure 8] This figure shows an example of an auxiliary pressurizing member provided in a charge / discharge jig device according to one embodiment of the present invention. [Figure 9] These graphs show the test results for the examples in Figures 6 to 8. [Figure 10] These are other graphs showing the test results for the examples in Figures 6-8. [Figure 11] This figure shows a charging and discharging jig device according to another embodiment of the present invention. [Modes for carrying out the invention]

[0037] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings, so that they can be easily implemented by a person with ordinary skill in the art to which the present invention pertains. The present invention can be realized in various other forms besides those described below, and the scope of the present invention is not limited to the embodiments described herein.

[0038] To clearly explain the present invention, unnecessary explanatory parts have been omitted, and the same or similar reference numerals are used throughout the specification for identical or similar components.

[0039] Furthermore, the dimensions and thicknesses of each component shown in the drawings have been arbitrarily enlarged or reduced for the sake of explanation, so it is obvious that the content of the present invention is not limited to what is shown. In the following drawings, the thickness of each layer is shown enlarged in order to clearly represent the various layers and regions. Also, in the following drawings, the thickness of some layers and regions is shown in an exaggerated manner for the sake of explanation.

[0040] Furthermore, when describing a layer, membrane, region, or plate as being "on top of" another part, this must be interpreted to include not only cases where the corresponding layer, membrane, region, or plate is "directly above" the other part, but also cases where there are other parts in between. Conversely, when describing a corresponding layer, membrane, region, or plate as being "directly above" another part, it can mean that there are no other parts in between. Moreover, being "on top of" a reference part means being located above or below the reference part, and does not necessarily mean being located "up" in the opposite direction of gravity. On the other hand, just as describing something as being "on top of" another part can be understood by referring to the above, describing something as being "below" another part can also be understood.

[0041] Furthermore, when a specification as a whole states that a certain part "includes" a certain component, this means, unless otherwise stated, that it can further include other components rather than excluding them.

[0042] Furthermore, throughout the specification, "on a plane" means when the part is viewed from above, and "on a cross-section" means when the part is viewed from the side of a cross-section obtained by cutting the part perpendicularly.

[0043] The following describes a charging and discharging jig device according to one embodiment of the present invention.

[0044] First, in this invention, the sliding region S should be understood as a concept that includes the area near the boundary between the holding portion and the plain portion where the flatness of the electrode mixture layer is reduced, and the surrounding area. For further details, please refer to the explanation related to Figure 1.

[0045] Furthermore, in this invention, "sliding region 14" refers to the portion of the sliding region S in which the electrode tab is connected to the electrode. In other words, this invention describes an embodiment of the sliding region 14 located in the portion of the sliding region S in which the electrode tab is connected to the electrode.

[0046] In the portion of the electrode tab connected to the electrode, the sliding region 14 may have a slightly lower thickness than the body region 12 due to the sliding phenomenon of the electrode active material applied during the process, as detailed in Figure 2.

[0047] Figure 4 shows a charging and discharging jig device according to one embodiment of the present invention. Figure 5 is a cross-sectional view along the AA cutting line in Figure 4.

[0048] In the embodiment shown in Figure 4, a charging and discharging jig device for pressurizing the L-shaped battery cell 10 of Figure 2 is shown as an example. Referring to Figures 4 and 5, the charging and discharging jig device 100 of this embodiment may include a pair of pressurizing jigs 110, pressurizing pads 120 located on opposing surfaces of the pair of pressurizing jigs 110, and auxiliary pressurizing members 140 provided on the pressurizing pads 120. Here, protective paper 130 covering one side of the pressurizing pads 120 may also be positioned between the pressurizing pads 120 and the auxiliary pressurizing members 140.

[0049] The charge / discharge jig device 100 in this embodiment may also be used in the activation process of a secondary battery. The charge / discharge jig device 100 in this embodiment is for limiting the volume change of the battery cell 10 that occurs during the activation process to a certain range, and can pressurize one side and the other side of the battery cell 10, respectively.

[0050] The pressurizing jig 110 is a component for applying pressure to the battery cell 10 and is made of a hard material such as metal. For example, the pressurizing jig 110 is manufactured from a hard, heat-resistant material such as stainless steel.

[0051] The pressurizing jigs 110 may be provided in pairs, and the battery cell 10 is placed between the opposing surfaces of the pair of pressurizing jigs 110. If the volume of the battery cell 10 increases due to the activation process, the pressurizing jigs 110 can limit the volume change of the battery cell 10 to a certain range by pressurizing one side and the other side of the battery cell 10.

[0052] The pressure pad 120 is configured to prevent the pressure jig 110 from excessively pressurizing the battery cell 10. The pressure pad 120 can buffer the pressure applied to the battery cell 10 from the pressure jig 110, preventing the battery cell 10 from being damaged by the pressure jig 110. The pressure pad 120 is manufactured from an elastic material such as silicone.

[0053] The pressure pads 120 are provided on one surface of the pressure jig 110. The pressure pads 120 are positioned on opposing surfaces of a pair of pressure jigs 110 so that the pressure supplied to the battery cell 10 by the pressure jigs 110 is transmitted through the pressure pads 120. The pressure pads 120 are provided for each of the pair of pressure jigs 110. The pressure pads 120 may be provided in pairs.

[0054] The protective paper 130 is designed to prevent damage to the battery cell 10 when it comes into contact with the charge / discharge jig device 100. The protective paper 130 is provided on one side of the pressure pad 120. The protective paper 130 is provided on one side of the pressure pad 120 that faces the battery cell 10.

[0055] On the other hand, the charging and discharging jig device 100 of this embodiment may include an auxiliary pressurizing member 140 to prevent uniform pressure from being transmitted to the battery cell 10 due to the thickness difference between the body region 12 and the sliding region 14 of the battery cell 10. The auxiliary pressurizing member 140 according to the present invention pressurizes the sliding region S of the battery cell when the battery cell 10 is placed between a pair of pressurizing jigs 110. In this embodiment, as one example, the auxiliary pressurizing member 140 pressurizes the sliding region 14, which corresponds to the portion of the sliding region S in which the electrode tab is connected to the electrode.

[0056] The auxiliary pressure member 140 may also be called a jig formation tape. That is, the auxiliary pressure member 140 has a tape shape or a strip shape. The auxiliary pressure member 140 is also positioned parallel to one end of the pair of pressure jigs 110.

[0057] The auxiliary pressurizing member 140 is for eliminating the thickness difference between the body region 12 and the sliding region 14 of the battery cell 10. The auxiliary pressurizing member 140 may also be for forming a step on one surface of the charging / discharging jig device 100 that protrudes toward the battery cell 10 so that uniform pressure is applied from the pressurizing jig 110 to the battery cell 10.

[0058] The auxiliary pressurizing member 140 is provided on one surface of the charge / discharge jig device 100 facing the battery cell 10, thereby creating a step on the pressurizing surface of the charge / discharge jig device 100. The auxiliary pressurizing member 140 may be provided on one surface of the protective paper 130 facing the battery cell 10, as shown in Figure 5, but it can also be provided on one surface of the pressurizing pad 120. In this way, when the auxiliary pressurizing member 140 is provided on one surface of the pressurizing pad 120 or one surface of the protective paper 130, when the charge / discharge jig device 100 pressurizes the battery cell 10, the position of the auxiliary pressurizing member 140 is slightly adjusted by the pressurizing pad 120, thereby preventing the auxiliary pressurizing member 140 from excessively pressurizing the battery cell 10 or damaging the battery cell 10. This is because the auxiliary pressurizing member 140 is made of a harder material with higher hardness and lower elasticity than the pressurizing pad 120 or protective paper 130.

[0059] The auxiliary pressurizing member 140 is positioned to correspond to the sliding region 14 of the battery cell 10. The auxiliary pressurizing member 140 is positioned to be separated from the body region 12 of the battery cell 10. As shown in Figure 5, the auxiliary pressurizing member 140 forms a step in the area of ​​the pressurizing surface of the charge / discharge jig device 100 that corresponds to the sliding region 14, so that pressure can be transmitted from the pressurizing jig 110 to the sliding region 14 which has a relatively low thickness.

[0060] The auxiliary pressurizing member 140 is preferably provided to cover 40% or more of the width of the sliding region 14. It is also preferable that the auxiliary pressurizing member 140 covers 40% to 100%, 50% to 90%, or 60% to 80% of the width of the sliding region 14. Since the auxiliary pressurizing member 140 is intended to eliminate the uneven pressure gradient applied from the charge / discharge jig device 100 due to the sliding of the active material in the sliding region 14, these values ​​take into account the sliding position and size. Therefore, considering the normal sliding range, it is preferable that the auxiliary pressurizing member 140 covers 60% to 80% of the sliding region 14.

[0061] The length, width, and thickness of the auxiliary pressurizing member 140 can be set differently depending on the size or thickness of the sliding region 14. In this case, it is preferable that the length, width, and thickness of the auxiliary pressurizing member 140 are set to be similar to the pressure transmitted from the pressurizing jig 110 to the body region 12 and the pressure transmitted to the sliding region 14.

[0062] On the other hand, while the above-described embodiment explains pressurizing the L-shaped battery cell 10 shown in Figures 2 and 4, the present invention is not limited to the illustrated form and can be applied to pressurizing battery cells 10 of various shapes. For example, as a charge / discharge jig device according to another embodiment of the present invention, it can also be modified and applied to a charge / discharge jig device for pressurizing the battery cell 10 shown in Figure 11. Furthermore, although not shown in the present invention, the present invention can be modified and applied even when the positive electrode tab and negative electrode tab are provided at opposite ends of the battery cell 10, respectively, demonstrating that various modifications and changes are possible.

[0063] Furthermore, in the above-described embodiment, the auxiliary pressurizing member 140 was shown to pressurize the sliding region 14 corresponding to the portion of the sliding region S where the electrode tab is connected to the electrode. However, the present invention is not limited to this, and it is sufficient if the auxiliary pressurizing member 140 pressurizes the sliding region S of other parts of the battery cell. The present invention can be modified and adapted to suit a variety of environments in which it is realized.

[0064] The following describes a test of an auxiliary pressurizing member provided in a charge / discharge jig device according to one embodiment of the present invention.

[0065] Figures 6 to 8 show examples of auxiliary pressurizing members provided to the charge / discharge jig device in Figure 4. Figure 9 is a graph showing test results for the examples in Figures 6 to 8. Figure 10 is another graph showing test results for the examples in Figures 6 to 8. In Figures 6 to 8, JF tape is an abbreviation for jig formation tape and refers to the auxiliary pressurizing member 140.

[0066] Referring to Figures 6 to 8, the auxiliary pressurizing member 140 is provided to cover a portion of the sliding region 14. The auxiliary pressurizing member 140 is provided to cover 60% to 80% of the sliding region 14. In the case of the battery cell 10 illustrated in Figures 6 to 8, the width of the sliding region 14 is 20 mm, the minimum width of the auxiliary pressurizing member 140 is 12 mm, and the auxiliary pressurizing member 140 is illustrated to cover 60% of the sliding region 14.

[0067] The position and dimensions of the auxiliary pressurizing member 140 provided to the charge / discharge jig device 100 can vary. The auxiliary pressurizing member 140 may be provided only in the portion corresponding to the sliding region 14, as shown in Figure 6, or it may be provided to cover the portion corresponding to the sliding region 14 and also to the portion where the sliding region 14 is not located, as shown in Figures 7 and 8. Furthermore, the auxiliary pressurizing member 140 may be provided with a relatively narrow width, as shown in Figure 6, or with a relatively wide width, as shown in Figures 7 and 8. In addition, the auxiliary pressurizing member 140 may be provided with a relatively small thickness, as shown in Figures 6 and 7, or with a relatively large thickness, as shown in Figure 8. Specifically, Figure 6 is exemplified as having a thickness of 30 μm and a width of 12 mm, Figure 7 as having a thickness of 30 μm and a width of 22 mm, and Figure 8 as having a thickness of 50 μm and a width of 22 mm.

[0068] Referring to Figure 9, the difference in pressure values ​​applied to the body region 12 and the sliding region 14 in the examples shown in Figures 6 to 8 can be compared. In this case, each value on the horizontal axis labeled "index" in Figure 9 represents the respective battery cell 10 used in the test, and the vertical axis may represent surface pressure in units of MPa.

[0069] Furthermore, Figures 9(a) and 9(b) show the results of the tests performed on the battery cell 10 using the charge / discharge jig device 100. In Figure 9, the results for Figures 6, 7, and 8 are indicated as "Test1 12+30", "Test2 22+30", and "POR 22+50", respectively.

[0070] When referring to the test results in Figure 7, it was confirmed that in Figures 6 and 7, there was a difference of more than twofold in the pressure values ​​applied to the body region 12 and the sliding region 14. However, in Figure 8, it became clear that the pressure values ​​applied to the body region 12 and the sliding region 14 were somewhat similar when compared to Figures 6 and 7.

[0071] Specifically, the pressure value in the sliding region 14 was approximately 0.5 MPa in Figure 6, approximately 0.65 MPa in Figure 7, and approximately 1.0 MPa in Figure 8. At this time, the pressure value in the body region 12 was approximately 1.2 MPa in Figures 6, 7, and 8. Therefore, it was confirmed that by applying the auxiliary pressurizing member 140, the pressure value in the sliding region 14 can be increased to 80% or more, or 80% to 100%, of the pressure value in the body region 12, and the pressure difference applied between the body region 12 and the sliding region 14 via the auxiliary pressurizing member 140 can be minimized.

[0072] Furthermore, when referring to the results described above, it is preferable that the thickness of the auxiliary pressurizing member 140 is greater than 30 μm or 31 μm or more. However, this is not necessarily the case, and it may vary depending on the size of the battery cell 10, the overall thickness, or the specifications of the charge / discharge jig device 100.

[0073] Referring to Figure 10, a more concrete comparison can be made of the difference in pressure values ​​applied to the body region 12 and the sliding region 14 in the example shown in Figure 8. In this case, the horizontal axis in Figure 10 may represent the measurement position, the vertical axis may represent the surface pressure, and the unit may be MPa.

[0074] Referring to the test results in Figure 10, it can be confirmed that the pressure distribution applied to the body region 12 and the sliding region 14 in Figure 8 is uniform. Therefore, using the charging and discharging jig device 100 of this embodiment, not only is the pressure difference applied to the body region 12 and the sliding region 14 minimized, but the positional pressure deviation in both the body region 12 and the sliding region 14 can also be minimized.

[0075] Specifically, the pressure applied to the sliding region 14 was approximately 86% of the pressure applied to the body region 12, with a positional deviation of approximately 0.03. Furthermore, the pressure applied to the sliding region 14 was approximately 1.05 MPa, with a positional deviation of approximately 0.04, while the pressure applied to the body region 12 was approximately 1.23 MPa, with a positional deviation of approximately 0.03.

[0076] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art that utilize the basic concepts of the present invention as defined in the following claims also fall within the scope of the present invention. [Explanation of symbols]

[0077] 10: Battery cell 12: Body area 14: Tab connection part 100: Charging and discharging jig device 110: Pressurized Jig 120: Compression pad 130: Protective paper 140: Auxiliary pressurizing member

Claims

1. A pair of pressure jigs, This includes an auxiliary pressurizing member provided between the opposing surfaces of the pair of pressurizing jigs, The auxiliary pressurizing member pressurizes the sliding region of the battery cell when the battery cell is positioned between the pair of pressurizing jigs. The system further includes a pressure pad located on at least one of the opposing surfaces of the pair of pressure jigs, which buffers the pressure applied to the body region of the battery cell. The auxiliary pressurizing member is a charging and discharging jig device located on the pressurizing pad.

2. The charging and discharging jig device according to claim 1, wherein the auxiliary pressurizing member provides a step that protrudes from the opposing surfaces of the pair of pressurizing jigs toward the battery cell.

3. The charging and discharging jig device according to claim 1, wherein the auxiliary pressurizing member pressurizes the portion of the sliding region of the battery cell where the electrode and the electrode tab are connected.

4. The charging and discharging jig device according to claim 1, wherein the auxiliary pressurizing member has a tape or strip shape and is arranged parallel to one end of the pair of pressurizing jigs.

5. The pressure pads are provided in pairs and are positioned on opposite sides of the pair of pressure jigs, The charging and discharging jig device according to claim 1, wherein the auxiliary pressurizing members are provided in a pair and are positioned on opposite sides of the pair of pressurizing pads, respectively.

6. The charging and discharging jig device according to claim 1, wherein the body region of the battery cell is separated from the auxiliary pressurizing member.

7. The charging and discharging jig device according to claim 1, wherein the auxiliary pressurizing member is positioned to cover 40% to 100% of the width of the sliding region.

8. The charging and discharging jig device according to claim 1, wherein the auxiliary pressurizing member is positioned to cover 60% to 80% of the width of the sliding region.

9. The charging and discharging jig device according to claim 5, wherein the auxiliary pressing member is made of a material with higher hardness than the pressing pad.

10. The charging and discharging jig device according to claim 5, wherein the pressure pad is made of silicone.

11. The charging and discharging jig device according to claim 1, wherein the pressurizing jig is made of stainless steel.

12. The charging and discharging jig device according to claim 1, further comprising a protective paper positioned between the auxiliary pressurizing member and the pressurizing pad.

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